Groups > linux.kernel > #1327039 > unrolled thread

[PATCH V4 00/23] MMCONFIG refactoring and support for ARM64 PCI hostbridge init based on ACPI

Started by	Tomasz Nowicki <tn@semihalf.com>
First post	2016-02-04 18:30 +0100
Last post	2016-02-04 18:40 +0100
Articles	20 on this page of 21 — 1 participant

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  [PATCH V4 00/23] MMCONFIG refactoring and support for ARM64 PCI hostbridge init based on ACPI Tomasz Nowicki <tn@semihalf.com> - 2016-02-04 18:30 +0100
    [PATCH V4 12/23] x86, ia64, pci: Remove ACPI companion device from platform specific data. Tomasz Nowicki <tn@semihalf.com> - 2016-02-04 18:30 +0100
    [PATCH V4 02/23] x86, pci, acpi: Move arch-agnostic MMCONFIG (aka ECAM) and ACPI code out of arch/x86/ directory Tomasz Nowicki <tn@semihalf.com> - 2016-02-04 18:30 +0100
    [PATCH V4 20/23] pci, acpi: Support for ACPI based generic PCI host controller init Tomasz Nowicki <tn@semihalf.com> - 2016-02-04 18:40 +0100
    [PATCH V4 04/23] x86, pci: mmconfig_{32,64}.c code refactoring - remove code duplication. Tomasz Nowicki <tn@semihalf.com> - 2016-02-04 18:40 +0100
    [PATCH V4 13/23] pci, acpi: Provide generic way to assign bus domain number. Tomasz Nowicki <tn@semihalf.com> - 2016-02-04 18:40 +0100
    [PATCH V4 06/23] XEN / PCI: Remove the dependence on arch x86 when PCI_MMCONFIG=y Tomasz Nowicki <tn@semihalf.com> - 2016-02-04 18:40 +0100
    [PATCH V4 10/23] x86, pci: Cleanup platform specific MCFG data by using ECAM hot_added flag. Tomasz Nowicki <tn@semihalf.com> - 2016-02-04 18:40 +0100
    [PATCH V4 07/23] pci, acpi, mcfg: Provide default RAW ACPI PCI config space accessors. Tomasz Nowicki <tn@semihalf.com> - 2016-02-04 18:40 +0100
    [PATCH V4 16/23] x86, acpi, pci: Use equivalent function from mcfg.c driver. Tomasz Nowicki <tn@semihalf.com> - 2016-02-04 18:40 +0100
    [PATCH V4 21/23] pci, acpi: Match PCI config space accessors against platfrom specific quirks. Tomasz Nowicki <tn@semihalf.com> - 2016-02-04 18:40 +0100
    [PATCH V4 03/23] pci, acpi, mcfg: Provide generic implementation of MCFG code initialization. Tomasz Nowicki <tn@semihalf.com> - 2016-02-04 18:40 +0100
    [PATCH V4 09/23] pci, acpi, ecam: Add flag to indicate whether ECAM region was hot added or not. Tomasz Nowicki <tn@semihalf.com> - 2016-02-04 18:40 +0100
    [PATCH V4 23/23] arm64, pci, acpi: Start using ACPI based PCI host bridge driver for ARM64. Tomasz Nowicki <tn@semihalf.com> - 2016-02-04 18:40 +0100
    [PATCH V4 22/23] arm64, pci, acpi: Assign legacy IRQs once device is enable. Tomasz Nowicki <tn@semihalf.com> - 2016-02-04 18:40 +0100
    [PATCH V4 01/23] x86, pci: Reorder logic of pci_mmconfig_insert() function Tomasz Nowicki <tn@semihalf.com> - 2016-02-04 18:40 +0100
    [PATCH V4 11/23] pci, acpi: Move ACPI host bridge device companion assignment to core code. Tomasz Nowicki <tn@semihalf.com> - 2016-02-04 18:40 +0100
    [PATCH V4 15/23] acpi, mcfg: Implement two calls that might be used to inject/remove MCFG region. Tomasz Nowicki <tn@semihalf.com> - 2016-02-04 18:40 +0100
    [PATCH V4 08/23] arm64, acpi: Use MCFG and empty PCI config space accessors from mcfg.c file. Tomasz Nowicki <tn@semihalf.com> - 2016-02-04 18:40 +0100
    [PATCH V4 18/23] pci, of: Move the PCI I/O space management to PCI core code. Tomasz Nowicki <tn@semihalf.com> - 2016-02-04 18:40 +0100
    [PATCH V4 14/23] x86, ia64: Include acpi_pci_{add|remove}_bus to the default pcibios_{add|remove}_bus implementation. Tomasz Nowicki <tn@semihalf.com> - 2016-02-04 18:40 +0100

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#1327039 — [PATCH V4 00/23] MMCONFIG refactoring and support for ARM64 PCI hostbridge init based on ACPI

From	Tomasz Nowicki <tn@semihalf.com>
Date	2016-02-04 18:30 +0100
Subject	[PATCH V4 00/23] MMCONFIG refactoring and support for ARM64 PCI hostbridge init based on ACPI
Message-ID	<qYvTc-53o-7@gated-at.bofh.it>

From the functionality point of view this series might be split into the
following logic parts:
1. Make MMCONFIG code arch-agnostic which allows all architectures to collect
   PCI config regions and used when necessary.
2. Move non-arch specific bits to the core code.
3. Use MMCONFIG code and implement generic ACPI based PCI host controller driver.
4. Enable above driver on ARM64

Patches has been built on top of 4.5-rc1 and can be found here:
git@github.com:semihalf-nowicki-tomasz/linux.git (pci-acpi-v4)

NOTE, this patch set depends on Lorenzo's fixes:
https://patchwork.ozlabs.org/patch/576450/
which can be found in pci-acpi-v4 branch.

This has been tested on Cavium ThunderX server, JunoR2, HP RX2660 IA64, x86,
Hip05, X-Gene and QEMU-aarch64. Any help in reviewing and testing is very appreciated.

v3 -> v4
- dropped Jiang's fix http://lkml.iu.edu/hypermail/linux/kernel/1601.1/04318.html
- added Lorenzo's fix patch 19/24
- ACPI PCI bus domain number assigning cleanup
- changed resource management, we now claim and reassign resources
- improvements for applying quirks
- dropped Matthew's http://www.spinics.net/lists/linux-pci/msg45950.html dependency
- rebased to 4.5-rc1

v2 -> v3
- fix legacy IRQ assigning and IO ports registration
- remove reference to arch specific companion device for ia64
- move ACPI PCI host controller driver to pci_root.c
- drop generic domain assignment for x86 and ia64 as I am not
  able to run all necessary test variants
- drop patch which cleaned legacy IRQ assignment since it belongs to
  Mathew's series:
  https://patchwork.ozlabs.org/patch/557504/
- extend MCFG quirk code
- rebased to 4.4

v1 -> v2
- moved non-arch specific piece of code to dirver/acpi/ directory
- fixed IO resource handling
- introduced PCI config accessors quirks matching
- moved ACPI_COMPANION_SET to generic code

v1 - https://lkml.org/lkml/2015/10/27/504
v2 - https://lkml.org/lkml/2015/12/16/246
v3 - http://lkml.iu.edu/hypermail/linux/kernel/1601.1/04308.html

Lorenzo Pieralisi (1):
  drivers: pci: add generic code to claim bus resources

Tomasz Nowicki (22):
  x86, pci: Reorder logic of pci_mmconfig_insert() function
  x86, pci, acpi: Move arch-agnostic MMCONFIG (aka ECAM) and ACPI code
    out of arch/x86/ directory
  pci, acpi, mcfg: Provide generic implementation of MCFG code
    initialization.
  x86, pci: mmconfig_{32,64}.c code refactoring - remove code
    duplication.
  x86, pci, ecam: mmconfig_64.c becomes default implementation for ECAM
    driver.
  XEN / PCI: Remove the dependence on arch x86 when PCI_MMCONFIG=y
  pci, acpi, mcfg: Provide default RAW ACPI PCI config space accessors.
  arm64, acpi: Use MCFG and empty PCI config space accessors from mcfg.c
    file.
  pci, acpi, ecam: Add flag to indicate whether ECAM region was hot
    added or not.
  x86, pci: Cleanup platform specific MCFG data by using ECAM hot_added
    flag.
  pci, acpi: Move ACPI host bridge device companion assignment to core
    code.
  x86, ia64, pci: Remove ACPI companion device from platform specific
    data.
  pci, acpi: Provide generic way to assign bus domain number.
  x86, ia64: Include acpi_pci_{add|remove}_bus to the default
    pcibios_{add|remove}_bus implementation.
  acpi, mcfg: Implement two calls that might be used to inject/remove
    MCFG region.
  x86, acpi, pci: Use equivalent function from mcfg.c driver.
  acpi, mcfg: Add default PCI config accessors implementation and
    initial support for related quirks.
  pci, of: Move the PCI I/O space management to PCI core code.
  pci, acpi: Support for ACPI based generic PCI host controller init
  pci, acpi: Match PCI config space accessors against platfrom specific
    quirks.
  arm64, pci, acpi: Assign legacy IRQs once device is enable.
  arm64, pci, acpi: Start using ACPI based PCI host bridge driver for
    ARM64.

 arch/arm64/Kconfig                 |   8 ++
 arch/arm64/kernel/pci.c            |  37 ++----
 arch/ia64/hp/common/sba_iommu.c    |   2 +-
 arch/ia64/include/asm/pci.h        |   1 -
 arch/ia64/pci/pci.c                |  26 ----
 arch/ia64/sn/kernel/io_acpi_init.c |   4 +-
 arch/x86/Kconfig                   |   4 +
 arch/x86/include/asm/pci.h         |   3 -
 arch/x86/include/asm/pci_x86.h     |  28 +----
 arch/x86/pci/acpi.c                |  56 ++-------
 arch/x86/pci/common.c              |  10 --
 arch/x86/pci/mmconfig-shared.c     | 250 ++++++-------------------------------
 arch/x86/pci/mmconfig_32.c         |  11 +-
 arch/x86/pci/mmconfig_64.c         |  67 +---------
 arch/x86/pci/numachip.c            |   1 +
 drivers/acpi/Kconfig               |   7 ++
 drivers/acpi/Makefile              |   1 +
 drivers/acpi/mcfg.c                | 201 +++++++++++++++++++++++++++++
 drivers/acpi/pci_root.c            | 134 +++++++++++++++++++-
 drivers/of/address.c               | 116 +----------------
 drivers/pci/Kconfig                |  10 ++
 drivers/pci/Makefile               |   5 +
 drivers/pci/ecam.c                 | 234 ++++++++++++++++++++++++++++++++++
 drivers/pci/pci.c                  | 126 ++++++++++++++++++-
 drivers/pci/probe.c                |   5 +
 drivers/pci/setup-bus.c            |  63 ++++++++++
 drivers/xen/pci.c                  |   7 +-
 include/acpi/acpi_bus.h            |   1 +
 include/asm-generic/vmlinux.lds.h  |   7 ++
 include/linux/acpi.h               |   2 +
 include/linux/ecam.h               |  62 +++++++++
 include/linux/of_address.h         |   9 --
 include/linux/pci-acpi.h           |  19 +++
 include/linux/pci.h                |   6 +
 34 files changed, 962 insertions(+), 561 deletions(-)
 create mode 100644 drivers/acpi/mcfg.c
 create mode 100644 drivers/pci/ecam.c
 create mode 100644 include/linux/ecam.h

-- 
1.9.1

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#1327040 — [PATCH V4 12/23] x86, ia64, pci: Remove ACPI companion device from platform specific data.

From	Tomasz Nowicki <tn@semihalf.com>
Date	2016-02-04 18:30 +0100
Subject	[PATCH V4 12/23] x86, ia64, pci: Remove ACPI companion device from platform specific data.
Message-ID	<qYvTd-53o-21@gated-at.bofh.it>
In reply to	#1327039

Since PCI core code is setting ACPI companion device for us now,
platform specific ACPI companion device setting turns out to be dead now.
Therefore we can get rid of it, including related companion reference
from PCI sysdata structure.

Signed-off-by: Tomasz Nowicki <tn@semihalf.com>
Tested-by: Duc Dang <dhdang@apm.com>
Tested-by: Dongdong Liu <liudongdong3@huawei.com>
Tested-by: Hanjun Guo <hanjun.guo@linaro.org>
Tested-by: Graeme Gregory <graeme.gregory@linaro.org>
Tested-by: Sinan Kaya <okaya@codeaurora.org>
---
 arch/ia64/hp/common/sba_iommu.c    |  2 +-
 arch/ia64/include/asm/pci.h        |  1 -
 arch/ia64/pci/pci.c                | 16 ----------------
 arch/ia64/sn/kernel/io_acpi_init.c |  4 ++--
 arch/x86/include/asm/pci.h         |  3 ---
 arch/x86/pci/acpi.c                | 17 -----------------
 6 files changed, 3 insertions(+), 40 deletions(-)

diff --git a/arch/ia64/hp/common/sba_iommu.c b/arch/ia64/hp/common/sba_iommu.c
index a6d6190..78e4444 100644
--- a/arch/ia64/hp/common/sba_iommu.c
+++ b/arch/ia64/hp/common/sba_iommu.c
@@ -1981,7 +1981,7 @@ sba_connect_bus(struct pci_bus *bus)
 	if (PCI_CONTROLLER(bus)->iommu)
 		return;
 
-	handle = acpi_device_handle(PCI_CONTROLLER(bus)->companion);
+	handle = acpi_device_handle(ACPI_COMPANION(bus->bridge));
 	if (!handle)
 		return;
 
diff --git a/arch/ia64/include/asm/pci.h b/arch/ia64/include/asm/pci.h
index 07039d1..5050748 100644
--- a/arch/ia64/include/asm/pci.h
+++ b/arch/ia64/include/asm/pci.h
@@ -65,7 +65,6 @@ extern int pci_mmap_legacy_page_range(struct pci_bus *bus,
 #define pci_legacy_write platform_pci_legacy_write
 
 struct pci_controller {
-	struct acpi_device *companion;
 	void *iommu;
 	int segment;
 	int node;		/* nearest node with memory or NUMA_NO_NODE for global allocation */
diff --git a/arch/ia64/pci/pci.c b/arch/ia64/pci/pci.c
index 8f6ac2f..978d6af 100644
--- a/arch/ia64/pci/pci.c
+++ b/arch/ia64/pci/pci.c
@@ -301,28 +301,12 @@ struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
 	}
 
 	info->controller.segment = root->segment;
-	info->controller.companion = device;
 	info->controller.node = acpi_get_node(device->handle);
 	INIT_LIST_HEAD(&info->io_resources);
 	return acpi_pci_root_create(root, &pci_acpi_root_ops,
 				    &info->common, &info->controller);
 }
 
-int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge)
-{
-	/*
-	 * We pass NULL as parent to pci_create_root_bus(), so if it is not NULL
-	 * here, pci_create_root_bus() has been called by someone else and
-	 * sysdata is likely to be different from what we expect.  Let it go in
-	 * that case.
-	 */
-	if (!bridge->dev.parent) {
-		struct pci_controller *controller = bridge->bus->sysdata;
-		ACPI_COMPANION_SET(&bridge->dev, controller->companion);
-	}
-	return 0;
-}
-
 void pcibios_fixup_device_resources(struct pci_dev *dev)
 {
 	int idx;
diff --git a/arch/ia64/sn/kernel/io_acpi_init.c b/arch/ia64/sn/kernel/io_acpi_init.c
index 0640739..bcfddc2 100644
--- a/arch/ia64/sn/kernel/io_acpi_init.c
+++ b/arch/ia64/sn/kernel/io_acpi_init.c
@@ -132,7 +132,7 @@ sn_get_bussoft_ptr(struct pci_bus *bus)
 	struct acpi_resource_vendor_typed *vendor;
 
 
-	handle = acpi_device_handle(PCI_CONTROLLER(bus)->companion);
+	handle = acpi_device_handle(ACPI_COMPANION(bus->bridge));
 	status = acpi_get_vendor_resource(handle, METHOD_NAME__CRS,
 					  &sn_uuid, &buffer);
 	if (ACPI_FAILURE(status)) {
@@ -360,7 +360,7 @@ sn_acpi_get_pcidev_info(struct pci_dev *dev, struct pcidev_info **pcidev_info,
 	acpi_status status;
 	struct acpi_buffer name_buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 
-	rootbus_handle = acpi_device_handle(PCI_CONTROLLER(dev)->companion);
+	rootbus_handle = acpi_device_handle(ACPI_COMPANION(dev->bus->bridge));
         status = acpi_evaluate_integer(rootbus_handle, METHOD_NAME__SEG, NULL,
                                        &segment);
         if (ACPI_SUCCESS(status)) {
diff --git a/arch/x86/include/asm/pci.h b/arch/x86/include/asm/pci.h
index 4625943..a98c022 100644
--- a/arch/x86/include/asm/pci.h
+++ b/arch/x86/include/asm/pci.h
@@ -14,9 +14,6 @@
 struct pci_sysdata {
 	int		domain;		/* PCI domain */
 	int		node;		/* NUMA node */
-#ifdef CONFIG_ACPI
-	struct acpi_device *companion;	/* ACPI companion device */
-#endif
 #ifdef CONFIG_X86_64
 	void		*iommu;		/* IOMMU private data */
 #endif
diff --git a/arch/x86/pci/acpi.c b/arch/x86/pci/acpi.c
index 8e89921..d5086d1 100644
--- a/arch/x86/pci/acpi.c
+++ b/arch/x86/pci/acpi.c
@@ -341,7 +341,6 @@ struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
 		struct pci_sysdata sd = {
 			.domain = domain,
 			.node = node,
-			.companion = root->device
 		};
 
 		memcpy(bus->sysdata, &sd, sizeof(sd));
@@ -356,7 +355,6 @@ struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
 		else {
 			info->sd.domain = domain;
 			info->sd.node = node;
-			info->sd.companion = root->device;
 			bus = acpi_pci_root_create(root, &acpi_pci_root_ops,
 						   &info->common, &info->sd);
 		}
@@ -374,21 +372,6 @@ struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
 	return bus;
 }
 
-int pcibios_root_bridge_prepare(struct pci_host_bridge *bridge)
-{
-	/*
-	 * We pass NULL as parent to pci_create_root_bus(), so if it is not NULL
-	 * here, pci_create_root_bus() has been called by someone else and
-	 * sysdata is likely to be different from what we expect.  Let it go in
-	 * that case.
-	 */
-	if (!bridge->dev.parent) {
-		struct pci_sysdata *sd = bridge->bus->sysdata;
-		ACPI_COMPANION_SET(&bridge->dev, sd->companion);
-	}
-	return 0;
-}
-
 int __init pci_acpi_init(void)
 {
 	struct pci_dev *dev = NULL;
-- 
1.9.1

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#1327042 — [PATCH V4 02/23] x86, pci, acpi: Move arch-agnostic MMCONFIG (aka ECAM) and ACPI code out of arch/x86/ directory

From	Tomasz Nowicki <tn@semihalf.com>
Date	2016-02-04 18:30 +0100
Subject	[PATCH V4 02/23] x86, pci, acpi: Move arch-agnostic MMCONFIG (aka ECAM) and ACPI code out of arch/x86/ directory
Message-ID	<qYvTd-53o-25@gated-at.bofh.it>
In reply to	#1327039

ECAM standard and MCFG table are architecture independent and it makes
sense to share common code across all architectures. Both are going to
corresponding files - ecam.c and mcfg.c

While we are here, rename pci_parse_mcfg to acpi_parse_mcfg.
We already have acpi_parse_mcfg prototype which is used nowhere.
At the same time, we need pci_parse_mcfg been global so acpi_parse_mcfg
can be used perfectly here.

Signed-off-by: Tomasz Nowicki <tn@semihalf.com>
Tested-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com>
Tested-by: Jeremy Linton <jeremy.linton@arm.com>
Tested-by: Duc Dang <dhdang@apm.com>
Tested-by: Dongdong Liu <liudongdong3@huawei.com>
Tested-by: Hanjun Guo <hanjun.guo@linaro.org>
Tested-by: Graeme Gregory <graeme.gregory@linaro.org>
Tested-by: Sinan Kaya <okaya@codeaurora.org>
---
 arch/x86/Kconfig               |   3 +
 arch/x86/include/asm/pci_x86.h |  21 -----
 arch/x86/pci/acpi.c            |   1 +
 arch/x86/pci/mmconfig-shared.c | 205 +----------------------------------------
 arch/x86/pci/mmconfig_32.c     |   1 +
 arch/x86/pci/mmconfig_64.c     |   1 +
 arch/x86/pci/numachip.c        |   1 +
 drivers/acpi/Makefile          |   1 +
 drivers/acpi/mcfg.c            |  59 ++++++++++++
 drivers/pci/Kconfig            |   7 ++
 drivers/pci/Makefile           |   5 +
 drivers/pci/ecam.c             | 175 +++++++++++++++++++++++++++++++++++
 drivers/xen/pci.c              |   1 +
 include/linux/acpi.h           |   2 +
 include/linux/ecam.h           |  37 ++++++++
 15 files changed, 299 insertions(+), 221 deletions(-)
 create mode 100644 drivers/acpi/mcfg.c
 create mode 100644 drivers/pci/ecam.c
 create mode 100644 include/linux/ecam.h

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 330e738..a74acce 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -131,6 +131,7 @@ config X86
 	select HAVE_MIXED_BREAKPOINTS_REGS
 	select HAVE_OPROFILE
 	select HAVE_OPTPROBES
+	select HAVE_PCI_ECAM
 	select HAVE_PCSPKR_PLATFORM
 	select HAVE_PERF_EVENTS
 	select HAVE_PERF_EVENTS_NMI
@@ -2399,6 +2400,7 @@ config PCI_DIRECT
 
 config PCI_MMCONFIG
 	def_bool y
+	select PCI_ECAM
 	depends on X86_32 && PCI && (ACPI || SFI) && (PCI_GOMMCONFIG || PCI_GOANY)
 
 config PCI_OLPC
@@ -2416,6 +2418,7 @@ config PCI_DOMAINS
 
 config PCI_MMCONFIG
 	bool "Support mmconfig PCI config space access"
+	select PCI_ECAM
 	depends on X86_64 && PCI && ACPI
 
 config PCI_CNB20LE_QUIRK
diff --git a/arch/x86/include/asm/pci_x86.h b/arch/x86/include/asm/pci_x86.h
index 46873fb..0281d2d 100644
--- a/arch/x86/include/asm/pci_x86.h
+++ b/arch/x86/include/asm/pci_x86.h
@@ -122,33 +122,12 @@ extern int pci_legacy_init(void);
 extern void pcibios_fixup_irqs(void);
 
 /* pci-mmconfig.c */
-
-/* "PCI MMCONFIG %04x [bus %02x-%02x]" */
-#define PCI_MMCFG_RESOURCE_NAME_LEN (22 + 4 + 2 + 2)
-
-struct pci_mmcfg_region {
-	struct list_head list;
-	struct resource res;
-	u64 address;
-	char __iomem *virt;
-	u16 segment;
-	u8 start_bus;
-	u8 end_bus;
-	char name[PCI_MMCFG_RESOURCE_NAME_LEN];
-};
-
 extern int __init pci_mmcfg_arch_init(void);
 extern void __init pci_mmcfg_arch_free(void);
 extern int pci_mmcfg_arch_map(struct pci_mmcfg_region *cfg);
 extern void pci_mmcfg_arch_unmap(struct pci_mmcfg_region *cfg);
 extern int pci_mmconfig_insert(struct device *dev, u16 seg, u8 start, u8 end,
 			       phys_addr_t addr);
-extern int pci_mmconfig_delete(u16 seg, u8 start, u8 end);
-extern struct pci_mmcfg_region *pci_mmconfig_lookup(int segment, int bus);
-
-extern struct list_head pci_mmcfg_list;
-
-#define PCI_MMCFG_BUS_OFFSET(bus)      ((bus) << 20)
 
 /*
  * On AMD Fam10h CPUs, all PCI MMIO configuration space accesses must use
diff --git a/arch/x86/pci/acpi.c b/arch/x86/pci/acpi.c
index e20dbe5..a997d7c 100644
--- a/arch/x86/pci/acpi.c
+++ b/arch/x86/pci/acpi.c
@@ -5,6 +5,7 @@
 #include <linux/dmi.h>
 #include <linux/slab.h>
 #include <linux/pci-acpi.h>
+#include <linux/ecam.h>
 #include <asm/numa.h>
 #include <asm/pci_x86.h>
 
diff --git a/arch/x86/pci/mmconfig-shared.c b/arch/x86/pci/mmconfig-shared.c
index c8bb9b0..ce2c2e4 100644
--- a/arch/x86/pci/mmconfig-shared.c
+++ b/arch/x86/pci/mmconfig-shared.c
@@ -18,6 +18,7 @@
 #include <linux/slab.h>
 #include <linux/mutex.h>
 #include <linux/rculist.h>
+#include <linux/ecam.h>
 #include <asm/e820.h>
 #include <asm/pci_x86.h>
 #include <asm/acpi.h>
@@ -27,103 +28,6 @@
 /* Indicate if the mmcfg resources have been placed into the resource table. */
 static bool pci_mmcfg_running_state;
 static bool pci_mmcfg_arch_init_failed;
-static DEFINE_MUTEX(pci_mmcfg_lock);
-
-LIST_HEAD(pci_mmcfg_list);
-
-static void __init pci_mmconfig_remove(struct pci_mmcfg_region *cfg)
-{
-	if (cfg->res.parent)
-		release_resource(&cfg->res);
-	list_del(&cfg->list);
-	kfree(cfg);
-}
-
-static void __init free_all_mmcfg(void)
-{
-	struct pci_mmcfg_region *cfg, *tmp;
-
-	pci_mmcfg_arch_free();
-	list_for_each_entry_safe(cfg, tmp, &pci_mmcfg_list, list)
-		pci_mmconfig_remove(cfg);
-}
-
-static void list_add_sorted(struct pci_mmcfg_region *new)
-{
-	struct pci_mmcfg_region *cfg;
-
-	/* keep list sorted by segment and starting bus number */
-	list_for_each_entry_rcu(cfg, &pci_mmcfg_list, list) {
-		if (cfg->segment > new->segment ||
-		    (cfg->segment == new->segment &&
-		     cfg->start_bus >= new->start_bus)) {
-			list_add_tail_rcu(&new->list, &cfg->list);
-			return;
-		}
-	}
-	list_add_tail_rcu(&new->list, &pci_mmcfg_list);
-}
-
-static struct pci_mmcfg_region *pci_mmconfig_alloc(int segment, int start,
-						   int end, u64 addr)
-{
-	struct pci_mmcfg_region *new;
-	struct resource *res;
-
-	if (addr == 0)
-		return NULL;
-
-	new = kzalloc(sizeof(*new), GFP_KERNEL);
-	if (!new)
-		return NULL;
-
-	new->address = addr;
-	new->segment = segment;
-	new->start_bus = start;
-	new->end_bus = end;
-
-	res = &new->res;
-	res->start = addr + PCI_MMCFG_BUS_OFFSET(start);
-	res->end = addr + PCI_MMCFG_BUS_OFFSET(end + 1) - 1;
-	res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
-	snprintf(new->name, PCI_MMCFG_RESOURCE_NAME_LEN,
-		 "PCI MMCONFIG %04x [bus %02x-%02x]", segment, start, end);
-	res->name = new->name;
-
-	return new;
-}
-
-static struct pci_mmcfg_region *__init pci_mmconfig_add(int segment, int start,
-							int end, u64 addr)
-{
-	struct pci_mmcfg_region *new;
-
-	new = pci_mmconfig_alloc(segment, start, end, addr);
-	if (new) {
-		mutex_lock(&pci_mmcfg_lock);
-		list_add_sorted(new);
-		mutex_unlock(&pci_mmcfg_lock);
-
-		pr_info(PREFIX
-		       "MMCONFIG for domain %04x [bus %02x-%02x] at %pR "
-		       "(base %#lx)\n",
-		       segment, start, end, &new->res, (unsigned long)addr);
-	}
-
-	return new;
-}
-
-struct pci_mmcfg_region *pci_mmconfig_lookup(int segment, int bus)
-{
-	struct pci_mmcfg_region *cfg;
-
-	list_for_each_entry_rcu(cfg, &pci_mmcfg_list, list)
-		if (cfg->segment == segment &&
-		    cfg->start_bus <= bus && bus <= cfg->end_bus)
-			return cfg;
-
-	return NULL;
-}
 
 static const char *__init pci_mmcfg_e7520(void)
 {
@@ -543,8 +447,8 @@ static void __init pci_mmcfg_reject_broken(int early)
 	}
 }
 
-static int __init acpi_mcfg_check_entry(struct acpi_table_mcfg *mcfg,
-					struct acpi_mcfg_allocation *cfg)
+int __init acpi_mcfg_check_entry(struct acpi_table_mcfg *mcfg,
+				 struct acpi_mcfg_allocation *cfg)
 {
 	int year;
 
@@ -566,50 +470,6 @@ static int __init acpi_mcfg_check_entry(struct acpi_table_mcfg *mcfg,
 	return -EINVAL;
 }
 
-static int __init pci_parse_mcfg(struct acpi_table_header *header)
-{
-	struct acpi_table_mcfg *mcfg;
-	struct acpi_mcfg_allocation *cfg_table, *cfg;
-	unsigned long i;
-	int entries;
-
-	if (!header)
-		return -EINVAL;
-
-	mcfg = (struct acpi_table_mcfg *)header;
-
-	/* how many config structures do we have */
-	free_all_mmcfg();
-	entries = 0;
-	i = header->length - sizeof(struct acpi_table_mcfg);
-	while (i >= sizeof(struct acpi_mcfg_allocation)) {
-		entries++;
-		i -= sizeof(struct acpi_mcfg_allocation);
-	}
-	if (entries == 0) {
-		pr_err(PREFIX "MMCONFIG has no entries\n");
-		return -ENODEV;
-	}
-
-	cfg_table = (struct acpi_mcfg_allocation *) &mcfg[1];
-	for (i = 0; i < entries; i++) {
-		cfg = &cfg_table[i];
-		if (acpi_mcfg_check_entry(mcfg, cfg)) {
-			free_all_mmcfg();
-			return -ENODEV;
-		}
-
-		if (pci_mmconfig_add(cfg->pci_segment, cfg->start_bus_number,
-				   cfg->end_bus_number, cfg->address) == NULL) {
-			pr_warn(PREFIX "no memory for MCFG entries\n");
-			free_all_mmcfg();
-			return -ENOMEM;
-		}
-	}
-
-	return 0;
-}
-
 #ifdef CONFIG_ACPI_APEI
 extern int (*arch_apei_filter_addr)(int (*func)(__u64 start, __u64 size,
 				     void *data), void *data);
@@ -668,7 +528,7 @@ void __init pci_mmcfg_early_init(void)
 		if (pci_mmcfg_check_hostbridge())
 			known_bridge = 1;
 		else
-			acpi_sfi_table_parse(ACPI_SIG_MCFG, pci_parse_mcfg);
+			acpi_sfi_table_parse(ACPI_SIG_MCFG, acpi_parse_mcfg);
 		__pci_mmcfg_init(1);
 
 		set_apei_filter();
@@ -686,7 +546,7 @@ void __init pci_mmcfg_late_init(void)
 
 	/* MMCONFIG hasn't been enabled yet, try again */
 	if (pci_probe & PCI_PROBE_MASK & ~PCI_PROBE_MMCONF) {
-		acpi_sfi_table_parse(ACPI_SIG_MCFG, pci_parse_mcfg);
+		acpi_sfi_table_parse(ACPI_SIG_MCFG, acpi_parse_mcfg);
 		__pci_mmcfg_init(0);
 	}
 }
@@ -720,38 +580,6 @@ static int __init pci_mmcfg_late_insert_resources(void)
  */
 late_initcall(pci_mmcfg_late_insert_resources);
 
-static int pci_mmconfig_inject(struct pci_mmcfg_region *cfg)
-{
-	struct pci_mmcfg_region *cfg_conflict;
-	int err = 0;
-
-	mutex_lock(&pci_mmcfg_lock);
-	cfg_conflict = pci_mmconfig_lookup(cfg->segment, cfg->start_bus);
-	if (cfg_conflict) {
-		if (cfg_conflict->end_bus < cfg->end_bus)
-			pr_info(FW_INFO "MMCONFIG for "
-				"domain %04x [bus %02x-%02x] "
-				"only partially covers this bridge\n",
-				cfg_conflict->segment, cfg_conflict->start_bus,
-				cfg_conflict->end_bus);
-		err = -EEXIST;
-		goto out;
-	}
-
-	if (pci_mmcfg_arch_map(cfg)) {
-		pr_warn("fail to map MMCONFIG %pR.\n", &cfg->res);
-		err = -ENOMEM;
-		goto out;
-	} else {
-		list_add_sorted(cfg);
-		pr_info("MMCONFIG at %pR (base %#lx)\n",
-			&cfg->res, (unsigned long)cfg->address);
-	}
-out:
-	mutex_unlock(&pci_mmcfg_lock);
-	return err;
-}
-
 /* Add MMCFG information for host bridges */
 int pci_mmconfig_insert(struct device *dev, u16 seg, u8 start, u8 end,
 			phys_addr_t addr)
@@ -808,26 +636,3 @@ error:
 	kfree(cfg);
 	return rc;
 }
-
-/* Delete MMCFG information for host bridges */
-int pci_mmconfig_delete(u16 seg, u8 start, u8 end)
-{
-	struct pci_mmcfg_region *cfg;
-
-	mutex_lock(&pci_mmcfg_lock);
-	list_for_each_entry_rcu(cfg, &pci_mmcfg_list, list)
-		if (cfg->segment == seg && cfg->start_bus == start &&
-		    cfg->end_bus == end) {
-			list_del_rcu(&cfg->list);
-			synchronize_rcu();
-			pci_mmcfg_arch_unmap(cfg);
-			if (cfg->res.parent)
-				release_resource(&cfg->res);
-			mutex_unlock(&pci_mmcfg_lock);
-			kfree(cfg);
-			return 0;
-		}
-	mutex_unlock(&pci_mmcfg_lock);
-
-	return -ENOENT;
-}
diff --git a/arch/x86/pci/mmconfig_32.c b/arch/x86/pci/mmconfig_32.c
index 43984bc..246f135 100644
--- a/arch/x86/pci/mmconfig_32.c
+++ b/arch/x86/pci/mmconfig_32.c
@@ -12,6 +12,7 @@
 #include <linux/pci.h>
 #include <linux/init.h>
 #include <linux/rcupdate.h>
+#include <linux/ecam.h>
 #include <asm/e820.h>
 #include <asm/pci_x86.h>
 
diff --git a/arch/x86/pci/mmconfig_64.c b/arch/x86/pci/mmconfig_64.c
index bea5249..b14fcd3 100644
--- a/arch/x86/pci/mmconfig_64.c
+++ b/arch/x86/pci/mmconfig_64.c
@@ -10,6 +10,7 @@
 #include <linux/acpi.h>
 #include <linux/bitmap.h>
 #include <linux/rcupdate.h>
+#include <linux/ecam.h>
 #include <asm/e820.h>
 #include <asm/pci_x86.h>
 
diff --git a/arch/x86/pci/numachip.c b/arch/x86/pci/numachip.c
index 2e565e6..55fbd18 100644
--- a/arch/x86/pci/numachip.c
+++ b/arch/x86/pci/numachip.c
@@ -13,6 +13,7 @@
  *
  */
 
+#include <linux/ecam.h>
 #include <linux/pci.h>
 #include <asm/pci_x86.h>
 
diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile
index 7ea903d..e660805 100644
--- a/drivers/acpi/Makefile
+++ b/drivers/acpi/Makefile
@@ -65,6 +65,7 @@ obj-$(CONFIG_ACPI_BUTTON)	+= button.o
 obj-$(CONFIG_ACPI_FAN)		+= fan.o
 obj-$(CONFIG_ACPI_VIDEO)	+= video.o
 obj-$(CONFIG_ACPI_PCI_SLOT)	+= pci_slot.o
+obj-$(CONFIG_PCI_MMCONFIG)	+= mcfg.o
 obj-$(CONFIG_ACPI_PROCESSOR)	+= processor.o
 obj-$(CONFIG_ACPI)		+= container.o
 obj-$(CONFIG_ACPI_THERMAL)	+= thermal.o
diff --git a/drivers/acpi/mcfg.c b/drivers/acpi/mcfg.c
new file mode 100644
index 0000000..5ecef20
--- /dev/null
+++ b/drivers/acpi/mcfg.c
@@ -0,0 +1,59 @@
+/*
+ * MCFG ACPI table parser.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/acpi.h>
+#include <linux/ecam.h>
+
+#include <asm/pci_x86.h> /* Temp hack before refactoring arch-specific calls */
+
+#define	PREFIX	"MCFG: "
+
+int __init acpi_parse_mcfg(struct acpi_table_header *header)
+{
+	struct acpi_table_mcfg *mcfg;
+	struct acpi_mcfg_allocation *cfg_table, *cfg;
+	unsigned long i;
+	int entries;
+
+	if (!header)
+		return -EINVAL;
+
+	mcfg = (struct acpi_table_mcfg *)header;
+
+	/* how many config structures do we have */
+	free_all_mmcfg();
+	entries = 0;
+	i = header->length - sizeof(struct acpi_table_mcfg);
+	while (i >= sizeof(struct acpi_mcfg_allocation)) {
+		entries++;
+		i -= sizeof(struct acpi_mcfg_allocation);
+	}
+	if (entries == 0) {
+		pr_err(PREFIX "MCFG table has no entries\n");
+		return -ENODEV;
+	}
+
+	cfg_table = (struct acpi_mcfg_allocation *) &mcfg[1];
+	for (i = 0; i < entries; i++) {
+		cfg = &cfg_table[i];
+		if (acpi_mcfg_check_entry(mcfg, cfg)) {
+			free_all_mmcfg();
+			return -ENODEV;
+		}
+
+		if (pci_mmconfig_add(cfg->pci_segment, cfg->start_bus_number,
+				 cfg->end_bus_number, cfg->address) == NULL) {
+			pr_warn(PREFIX "no memory for MCFG entries\n");
+			free_all_mmcfg();
+			return -ENOMEM;
+		}
+	}
+
+	return 0;
+}
diff --git a/drivers/pci/Kconfig b/drivers/pci/Kconfig
index 73de4ef..9950248 100644
--- a/drivers/pci/Kconfig
+++ b/drivers/pci/Kconfig
@@ -26,6 +26,13 @@ config PCI_MSI_IRQ_DOMAIN
 	depends on PCI_MSI
 	select GENERIC_MSI_IRQ_DOMAIN
 
+config PCI_ECAM
+	bool "Enhanced Configuration Access Mechanism (ECAM)"
+	depends on PCI && HAVE_PCI_ECAM
+
+config HAVE_PCI_ECAM
+	bool
+
 config PCI_DEBUG
 	bool "PCI Debugging"
 	depends on PCI && DEBUG_KERNEL
diff --git a/drivers/pci/Makefile b/drivers/pci/Makefile
index be3f631..eb574f8 100644
--- a/drivers/pci/Makefile
+++ b/drivers/pci/Makefile
@@ -42,6 +42,11 @@ obj-$(CONFIG_SPARC_LEON) += setup-irq.o
 obj-$(CONFIG_M68K) += setup-irq.o
 
 #
+# Enhanced Configuration Access Mechanism (ECAM)
+#
+obj-$(CONFIG_PCI_ECAM)	+= ecam.o
+
+#
 # ACPI Related PCI FW Functions
 # ACPI _DSM provided firmware instance and string name
 #
diff --git a/drivers/pci/ecam.c b/drivers/pci/ecam.c
new file mode 100644
index 0000000..d221dba
--- /dev/null
+++ b/drivers/pci/ecam.c
@@ -0,0 +1,175 @@
+/*
+ * Arch agnostic direct PCI config space access via
+ * ECAM (Enhanced Configuration Access Mechanism)
+ *
+ * Per-architecture code takes care of the mappings, region validation and
+ * accesses themselves.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ */
+
+#include <linux/mutex.h>
+#include <linux/rculist.h>
+#include <linux/ecam.h>
+
+#include <asm/io.h>
+#include <asm/pci_x86.h> /* Temp hack before refactoring arch-specific calls */
+
+#define PREFIX "PCI: "
+
+static DEFINE_MUTEX(pci_mmcfg_lock);
+
+LIST_HEAD(pci_mmcfg_list);
+
+static void __init pci_mmconfig_remove(struct pci_mmcfg_region *cfg)
+{
+	if (cfg->res.parent)
+		release_resource(&cfg->res);
+	list_del(&cfg->list);
+	kfree(cfg);
+}
+
+void __init free_all_mmcfg(void)
+{
+	struct pci_mmcfg_region *cfg, *tmp;
+
+	pci_mmcfg_arch_free();
+	list_for_each_entry_safe(cfg, tmp, &pci_mmcfg_list, list)
+		pci_mmconfig_remove(cfg);
+}
+
+void list_add_sorted(struct pci_mmcfg_region *new)
+{
+	struct pci_mmcfg_region *cfg;
+
+	/* keep list sorted by segment and starting bus number */
+	list_for_each_entry_rcu(cfg, &pci_mmcfg_list, list) {
+		if (cfg->segment > new->segment ||
+		    (cfg->segment == new->segment &&
+		     cfg->start_bus >= new->start_bus)) {
+			list_add_tail_rcu(&new->list, &cfg->list);
+			return;
+		}
+	}
+	list_add_tail_rcu(&new->list, &pci_mmcfg_list);
+}
+
+struct pci_mmcfg_region *pci_mmconfig_alloc(int segment, int start,
+					    int end, u64 addr)
+{
+	struct pci_mmcfg_region *new;
+	struct resource *res;
+
+	if (addr == 0)
+		return NULL;
+
+	new = kzalloc(sizeof(*new), GFP_KERNEL);
+	if (!new)
+		return NULL;
+
+	new->address = addr;
+	new->segment = segment;
+	new->start_bus = start;
+	new->end_bus = end;
+
+	res = &new->res;
+	res->start = addr + PCI_MMCFG_BUS_OFFSET(start);
+	res->end = addr + PCI_MMCFG_BUS_OFFSET(end + 1) - 1;
+	res->flags = IORESOURCE_MEM | IORESOURCE_BUSY;
+	snprintf(new->name, PCI_MMCFG_RESOURCE_NAME_LEN,
+		 "PCI MMCONFIG %04x [bus %02x-%02x]", segment, start, end);
+	res->name = new->name;
+
+	return new;
+}
+
+struct pci_mmcfg_region *pci_mmconfig_add(int segment, int start,
+					  int end, u64 addr)
+{
+	struct pci_mmcfg_region *new;
+
+	new = pci_mmconfig_alloc(segment, start, end, addr);
+	if (new) {
+		mutex_lock(&pci_mmcfg_lock);
+		list_add_sorted(new);
+		mutex_unlock(&pci_mmcfg_lock);
+
+		pr_info(PREFIX
+		       "MMCONFIG for domain %04x [bus %02x-%02x] at %pR "
+		       "(base %#lx)\n",
+		       segment, start, end, &new->res, (unsigned long)addr);
+	}
+
+	return new;
+}
+
+struct pci_mmcfg_region *pci_mmconfig_lookup(int segment, int bus)
+{
+	struct pci_mmcfg_region *cfg;
+
+	list_for_each_entry_rcu(cfg, &pci_mmcfg_list, list)
+		if (cfg->segment == segment &&
+		    cfg->start_bus <= bus && bus <= cfg->end_bus)
+			return cfg;
+
+	return NULL;
+}
+
+/* Delete MMCFG information for host bridges */
+int pci_mmconfig_delete(u16 seg, u8 start, u8 end)
+{
+	struct pci_mmcfg_region *cfg;
+
+	mutex_lock(&pci_mmcfg_lock);
+	list_for_each_entry_rcu(cfg, &pci_mmcfg_list, list)
+		if (cfg->segment == seg && cfg->start_bus == start &&
+		    cfg->end_bus == end) {
+			list_del_rcu(&cfg->list);
+			synchronize_rcu();
+			pci_mmcfg_arch_unmap(cfg);
+			if (cfg->res.parent)
+				release_resource(&cfg->res);
+			mutex_unlock(&pci_mmcfg_lock);
+			kfree(cfg);
+			return 0;
+		}
+	mutex_unlock(&pci_mmcfg_lock);
+
+	return -ENOENT;
+}
+
+int pci_mmconfig_inject(struct pci_mmcfg_region *cfg)
+{
+	struct pci_mmcfg_region *cfg_conflict;
+	int err = 0;
+
+	mutex_lock(&pci_mmcfg_lock);
+	cfg_conflict = pci_mmconfig_lookup(cfg->segment, cfg->start_bus);
+	if (cfg_conflict) {
+		if (cfg_conflict->end_bus < cfg->end_bus)
+			pr_info(FW_INFO "MMCONFIG for "
+				"domain %04x [bus %02x-%02x] "
+				"only partially covers this bridge\n",
+				cfg_conflict->segment, cfg_conflict->start_bus,
+				cfg_conflict->end_bus);
+		err = -EEXIST;
+		goto out;
+	}
+
+	if (pci_mmcfg_arch_map(cfg)) {
+		pr_warn("fail to map MMCONFIG %pR.\n", &cfg->res);
+		err = -ENOMEM;
+		goto out;
+	} else {
+		list_add_sorted(cfg);
+		pr_info("MMCONFIG at %pR (base %#lx)\n",
+			&cfg->res, (unsigned long)cfg->address);
+
+	}
+out:
+	mutex_unlock(&pci_mmcfg_lock);
+	return err;
+}
diff --git a/drivers/xen/pci.c b/drivers/xen/pci.c
index 7494dbe..6785ebb 100644
--- a/drivers/xen/pci.c
+++ b/drivers/xen/pci.c
@@ -20,6 +20,7 @@
 #include <linux/pci.h>
 #include <linux/acpi.h>
 #include <linux/pci-acpi.h>
+#include <linux/ecam.h>
 #include <xen/xen.h>
 #include <xen/interface/physdev.h>
 #include <xen/interface/xen.h>
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index 06ed7e5..c8130b3 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -237,6 +237,8 @@ int acpi_table_parse_madt(enum acpi_madt_type id,
 			  acpi_tbl_entry_handler handler,
 			  unsigned int max_entries);
 int acpi_parse_mcfg (struct acpi_table_header *header);
+int acpi_mcfg_check_entry(struct acpi_table_mcfg *mcfg,
+			  struct acpi_mcfg_allocation *cfg);
 void acpi_table_print_madt_entry (struct acpi_subtable_header *madt);
 
 /* the following four functions are architecture-dependent */
diff --git a/include/linux/ecam.h b/include/linux/ecam.h
new file mode 100644
index 0000000..dec3b52
--- /dev/null
+++ b/include/linux/ecam.h
@@ -0,0 +1,37 @@
+#ifndef __ECAM_H
+#define __ECAM_H
+#ifdef __KERNEL__
+
+#include <linux/types.h>
+#include <linux/acpi.h>
+
+/* "PCI MMCONFIG %04x [bus %02x-%02x]" */
+#define PCI_MMCFG_RESOURCE_NAME_LEN (22 + 4 + 2 + 2)
+
+struct pci_mmcfg_region {
+	struct list_head list;
+	struct resource res;
+	u64 address;
+	char __iomem *virt;
+	u16 segment;
+	u8 start_bus;
+	u8 end_bus;
+	char name[PCI_MMCFG_RESOURCE_NAME_LEN];
+};
+
+struct pci_mmcfg_region *pci_mmconfig_lookup(int segment, int bus);
+struct pci_mmcfg_region *pci_mmconfig_alloc(int segment, int start,
+						   int end, u64 addr);
+int pci_mmconfig_inject(struct pci_mmcfg_region *cfg);
+struct pci_mmcfg_region *pci_mmconfig_add(int segment, int start,
+						 int end, u64 addr);
+void list_add_sorted(struct pci_mmcfg_region *new);
+void free_all_mmcfg(void);
+int pci_mmconfig_delete(u16 seg, u8 start, u8 end);
+
+extern struct list_head pci_mmcfg_list;
+
+#define PCI_MMCFG_BUS_OFFSET(bus)      ((bus) << 20)
+
+#endif  /* __KERNEL__ */
+#endif  /* __ECAM_H */
-- 
1.9.1

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#1327044 — [PATCH V4 20/23] pci, acpi: Support for ACPI based generic PCI host controller init

From	Tomasz Nowicki <tn@semihalf.com>
Date	2016-02-04 18:40 +0100
Subject	[PATCH V4 20/23] pci, acpi: Support for ACPI based generic PCI host controller init
Message-ID	<qYw2S-57e-3@gated-at.bofh.it>
In reply to	#1327039

Because of two patch series:
1. Jiang Liu's common interface to support PCI host controller init
2. MMCONFIG refactoring (part of this patch set)
now we can think about generic ACPI based PCI host controller init
implementation out of arch/ directory.

These calls use information from MCFG table (PCI config space regions)
and _CRS method (IO/irq resources) to initialize PCI hostbridge.

Signed-off-by: Tomasz Nowicki <tn@semihalf.com>
Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org>
Signed-off-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com>
CC: Arnd Bergmann <arnd@arndb.de>
CC: Catalin Marinas <catalin.marinas@arm.com>
CC: Liviu Dudau <Liviu.Dudau@arm.com>
CC: Lorenzo Pieralisi <Lorenzo.Pieralisi@arm.com>
CC: Will Deacon <will.deacon@arm.com>
Tested-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com>
Tested-by: Jeremy Linton <jeremy.linton@arm.com>
Tested-by: Duc Dang <dhdang@apm.com>
Tested-by: Dongdong Liu <liudongdong3@huawei.com>
Tested-by: Hanjun Guo <hanjun.guo@linaro.org>
Tested-by: Graeme Gregory <graeme.gregory@linaro.org>
Tested-by: Sinan Kaya <okaya@codeaurora.org>
---
 drivers/acpi/Kconfig    |   7 +++
 drivers/acpi/pci_root.c | 111 ++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 118 insertions(+)

diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
index 183ffa3..1c7f57bd 100644
--- a/drivers/acpi/Kconfig
+++ b/drivers/acpi/Kconfig
@@ -346,6 +346,13 @@ config ACPI_PCI_SLOT
 	  i.e., segment/bus/device/function tuples, with physical slots in
 	  the system.  If you are unsure, say N.
 
+config ACPI_PCI_HOST_GENERIC
+	bool
+	help
+	  Select this config option from the architecture Kconfig,
+	  if it is preferred to enable ACPI PCI host controller driver which
+	  has no arch-specific assumptions.
+
 config X86_PM_TIMER
 	bool "Power Management Timer Support" if EXPERT
 	depends on X86
diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
index cc2c73a..acf0d53 100644
--- a/drivers/acpi/pci_root.c
+++ b/drivers/acpi/pci_root.c
@@ -532,6 +532,117 @@ static void negotiate_os_control(struct acpi_pci_root *root, int *no_aspm)
 	}
 }
 
+#ifdef CONFIG_ACPI_PCI_HOST_GENERIC
+static void pci_mcfg_release_info(struct acpi_pci_root_info *ci)
+{
+	pci_mmcfg_teardown_map(ci);
+	kfree(ci);
+}
+
+static int pci_acpi_root_prepare_resources(struct acpi_pci_root_info *ci)
+{
+	struct list_head *list = &ci->resources;
+	struct acpi_device *device = ci->bridge;
+	struct resource_entry *entry, *tmp;
+	unsigned long flags;
+	int ret;
+
+	flags = IORESOURCE_IO | IORESOURCE_MEM;
+	ret = acpi_dev_get_resources(device, list,
+				     acpi_dev_filter_resource_type_cb,
+				     (void *)flags);
+	if (ret < 0) {
+		dev_warn(&device->dev,
+			 "failed to parse _CRS method, error code %d\n", ret);
+		return ret;
+	} else if (ret == 0)
+		dev_dbg(&device->dev,
+			"no IO and memory resources present in _CRS\n");
+
+	resource_list_for_each_entry_safe(entry, tmp, &ci->resources) {
+		struct resource *res = entry->res;
+
+		if (entry->res->flags & IORESOURCE_DISABLED)
+			resource_list_destroy_entry(entry);
+		else
+			res->name = ci->name;
+
+		if (res->flags & IORESOURCE_IO) {
+			resource_size_t cpu_addr = res->start;
+			resource_size_t pci_addr = cpu_addr - entry->offset;
+			resource_size_t length = resource_size(res);
+			unsigned long port;
+
+			if (pci_register_io_range(cpu_addr, length)) {
+				resource_list_destroy_entry(entry);
+				continue;
+			}
+
+			port = pci_address_to_pio(cpu_addr);
+			if (port == (unsigned long)-1) {
+				resource_list_destroy_entry(entry);
+				continue;
+			}
+
+			res->start = port;
+			res->end = port + length - 1;
+			entry->offset = port - pci_addr;
+
+			if (pci_remap_iospace(res, cpu_addr) < 0)
+				resource_list_destroy_entry(entry);
+		}
+	}
+	return ret;
+}
+
+static struct acpi_pci_root_ops acpi_pci_root_ops = {
+	.init_info = pci_mmcfg_setup_map,
+	.release_info = pci_mcfg_release_info,
+	.prepare_resources = pci_acpi_root_prepare_resources,
+};
+
+/* Root bridge scanning */
+struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
+{
+	int node = acpi_get_node(root->device->handle);
+	int domain = root->segment;
+	int busnum = root->secondary.start;
+	struct acpi_pci_root_info *info;
+	struct pci_bus *bus, *child;
+
+	if (domain && !pci_domains_supported) {
+		pr_warn("PCI %04x:%02x: multiple domains not supported.\n",
+			domain, busnum);
+		return NULL;
+	}
+
+	info = kzalloc_node(sizeof(*info), GFP_KERNEL, node);
+	if (!info) {
+		dev_err(&root->device->dev,
+			"pci_bus %04x:%02x: ignored (out of memory)\n",
+			domain, busnum);
+		return NULL;
+	}
+
+	acpi_pci_root_ops.pci_ops = pci_mcfg_get_ops(root);
+	bus = acpi_pci_root_create(root, &acpi_pci_root_ops, info, root);
+	if (!bus)
+		return NULL;
+
+	pci_bus_claim_resources(bus);
+	pci_assign_unassigned_bus_resources(bus);
+
+	/*
+	 * After the PCI-E bus has been walked and all devices discovered,
+	 * configure any settings of the fabric that might be necessary.
+	 */
+	list_for_each_entry(child, &bus->children, node)
+		pcie_bus_configure_settings(child);
+
+	return bus;
+}
+#endif /* CONFIG_ACPI_PCI_HOST_GENERIC */
+
 static int acpi_pci_root_add(struct acpi_device *device,
 			     const struct acpi_device_id *not_used)
 {
-- 
1.9.1

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#1327046 — [PATCH V4 04/23] x86, pci: mmconfig_{32,64}.c code refactoring - remove code duplication.

From	Tomasz Nowicki <tn@semihalf.com>
Date	2016-02-04 18:40 +0100
Subject	[PATCH V4 04/23] x86, pci: mmconfig_{32,64}.c code refactoring - remove code duplication.
Message-ID	<qYw2S-57e-7@gated-at.bofh.it>
In reply to	#1327039

mmconfig_64.c version is going to be default implementation for low-level
operation on mmconfig regions. However, now it initializes raw_pci_ext_ops pointer which is specific for
x86 only. Moreover, mmconfig_32.c is doing the same thing at the same time.
So lets move it to mmconfig_shared.c so it becomes common for both and
mmconfig_64.c turns out to be purely arch agnostic.

Signed-off-by: Tomasz Nowicki <tn@semihalf.com>
Tested-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com>
Tested-by: Jeremy Linton <jeremy.linton@arm.com>
Tested-by: Duc Dang <dhdang@apm.com>
Tested-by: Dongdong Liu <liudongdong3@huawei.com>
Tested-by: Hanjun Guo <hanjun.guo@linaro.org>
Tested-by: Graeme Gregory <graeme.gregory@linaro.org>
Tested-by: Sinan Kaya <okaya@codeaurora.org>
---
 arch/x86/include/asm/pci_x86.h |  5 +++++
 arch/x86/pci/mmconfig-shared.c | 10 ++++++++--
 arch/x86/pci/mmconfig_32.c     | 10 ++--------
 arch/x86/pci/mmconfig_64.c     | 11 ++---------
 4 files changed, 17 insertions(+), 19 deletions(-)

diff --git a/arch/x86/include/asm/pci_x86.h b/arch/x86/include/asm/pci_x86.h
index 0281d2d..26e7dd4 100644
--- a/arch/x86/include/asm/pci_x86.h
+++ b/arch/x86/include/asm/pci_x86.h
@@ -129,6 +129,11 @@ extern void pci_mmcfg_arch_unmap(struct pci_mmcfg_region *cfg);
 extern int pci_mmconfig_insert(struct device *dev, u16 seg, u8 start, u8 end,
 			       phys_addr_t addr);
 
+int pci_mmcfg_read(unsigned int seg, unsigned int bus, unsigned int devfn,
+		   int reg, int len, u32 *value);
+int pci_mmcfg_write(unsigned int seg, unsigned int bus, unsigned int devfn,
+		    int reg, int len, u32 value);
+
 /*
  * On AMD Fam10h CPUs, all PCI MMIO configuration space accesses must use
  * %eax.  No other source or target registers may be used.  The following
diff --git a/arch/x86/pci/mmconfig-shared.c b/arch/x86/pci/mmconfig-shared.c
index ce2c2e4..980f304 100644
--- a/arch/x86/pci/mmconfig-shared.c
+++ b/arch/x86/pci/mmconfig-shared.c
@@ -29,6 +29,11 @@
 static bool pci_mmcfg_running_state;
 static bool pci_mmcfg_arch_init_failed;
 
+const struct pci_raw_ops pci_mmcfg = {
+	.read =		pci_mmcfg_read,
+	.write =	pci_mmcfg_write,
+};
+
 static const char *__init pci_mmcfg_e7520(void)
 {
 	u32 win;
@@ -512,9 +517,10 @@ static void __init __pci_mmcfg_init(int early)
 		}
 	}
 
-	if (pci_mmcfg_arch_init())
+	if (pci_mmcfg_arch_init()) {
+		raw_pci_ext_ops = &pci_mmcfg;
 		pci_probe = (pci_probe & ~PCI_PROBE_MASK) | PCI_PROBE_MMCONF;
-	else {
+	} else {
 		free_all_mmcfg();
 		pci_mmcfg_arch_init_failed = true;
 	}
diff --git a/arch/x86/pci/mmconfig_32.c b/arch/x86/pci/mmconfig_32.c
index 246f135..2ded56f 100644
--- a/arch/x86/pci/mmconfig_32.c
+++ b/arch/x86/pci/mmconfig_32.c
@@ -50,7 +50,7 @@ static void pci_exp_set_dev_base(unsigned int base, int bus, int devfn)
 	}
 }
 
-static int pci_mmcfg_read(unsigned int seg, unsigned int bus,
+int pci_mmcfg_read(unsigned int seg, unsigned int bus,
 			  unsigned int devfn, int reg, int len, u32 *value)
 {
 	unsigned long flags;
@@ -89,7 +89,7 @@ err:		*value = -1;
 	return 0;
 }
 
-static int pci_mmcfg_write(unsigned int seg, unsigned int bus,
+int pci_mmcfg_write(unsigned int seg, unsigned int bus,
 			   unsigned int devfn, int reg, int len, u32 value)
 {
 	unsigned long flags;
@@ -126,15 +126,9 @@ static int pci_mmcfg_write(unsigned int seg, unsigned int bus,
 	return 0;
 }
 
-const struct pci_raw_ops pci_mmcfg = {
-	.read =		pci_mmcfg_read,
-	.write =	pci_mmcfg_write,
-};
-
 int __init pci_mmcfg_arch_init(void)
 {
 	printk(KERN_INFO "PCI: Using MMCONFIG for extended config space\n");
-	raw_pci_ext_ops = &pci_mmcfg;
 	return 1;
 }
 
diff --git a/arch/x86/pci/mmconfig_64.c b/arch/x86/pci/mmconfig_64.c
index b14fcd3..d0c48eb 100644
--- a/arch/x86/pci/mmconfig_64.c
+++ b/arch/x86/pci/mmconfig_64.c
@@ -25,7 +25,7 @@ static char __iomem *pci_dev_base(unsigned int seg, unsigned int bus, unsigned i
 	return NULL;
 }
 
-static int pci_mmcfg_read(unsigned int seg, unsigned int bus,
+int pci_mmcfg_read(unsigned int seg, unsigned int bus,
 			  unsigned int devfn, int reg, int len, u32 *value)
 {
 	char __iomem *addr;
@@ -59,7 +59,7 @@ err:		*value = -1;
 	return 0;
 }
 
-static int pci_mmcfg_write(unsigned int seg, unsigned int bus,
+int pci_mmcfg_write(unsigned int seg, unsigned int bus,
 			   unsigned int devfn, int reg, int len, u32 value)
 {
 	char __iomem *addr;
@@ -91,11 +91,6 @@ static int pci_mmcfg_write(unsigned int seg, unsigned int bus,
 	return 0;
 }
 
-const struct pci_raw_ops pci_mmcfg = {
-	.read =		pci_mmcfg_read,
-	.write =	pci_mmcfg_write,
-};
-
 static void __iomem *mcfg_ioremap(struct pci_mmcfg_region *cfg)
 {
 	void __iomem *addr;
@@ -121,8 +116,6 @@ int __init pci_mmcfg_arch_init(void)
 			return 0;
 		}
 
-	raw_pci_ext_ops = &pci_mmcfg;
-
 	return 1;
 }
 
-- 
1.9.1

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#1327047 — [PATCH V4 13/23] pci, acpi: Provide generic way to assign bus domain number.

From	Tomasz Nowicki <tn@semihalf.com>
Date	2016-02-04 18:40 +0100
Subject	[PATCH V4 13/23] pci, acpi: Provide generic way to assign bus domain number.
Message-ID	<qYw2S-57e-9@gated-at.bofh.it>
In reply to	#1327039

As we now have valid PCI host bridge device reference we can
introduce code that is going to find its bus domain number using
ACPI _SEG method.

Note that _SEG method is optional, therefore _SEG absence means
that all PCI buses belong to domain 0.

While at it, for the sake of code clarity we put ACPI and DT domain
assign methods into the corresponding helpers.

Signed-off-by: Tomasz Nowicki <tn@semihalf.com>
Reviewed-by: Liviu Dudau <Liviu.Dudau@arm.com>
Tested-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com>
Tested-by: Jeremy Linton <jeremy.linton@arm.com>
Tested-by: Duc Dang <dhdang@apm.com>
Tested-by: Dongdong Liu <liudongdong3@huawei.com>
Tested-by: Hanjun Guo <hanjun.guo@linaro.org>
Tested-by: Graeme Gregory <graeme.gregory@linaro.org>
Tested-by: Sinan Kaya <okaya@codeaurora.org>
---
 drivers/acpi/pci_root.c  | 18 ++++++++++++++++++
 drivers/pci/pci.c        | 11 +++++++++--
 include/linux/pci-acpi.h |  2 ++
 3 files changed, 29 insertions(+), 2 deletions(-)

diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
index a65c8c2..cc2c73a 100644
--- a/drivers/acpi/pci_root.c
+++ b/drivers/acpi/pci_root.c
@@ -419,6 +419,24 @@ out:
 }
 EXPORT_SYMBOL(acpi_pci_osc_control_set);
 
+int acpi_pci_bus_domain_nr(struct device *parent)
+{
+	struct acpi_device *acpi_dev = to_acpi_device(parent);
+	unsigned long long segment = 0;
+	acpi_status status;
+
+	/*
+	 * If _SEG method does not exist, following ACPI spec (6.5.6)
+	 * all PCI buses belong to domain 0.
+	 */
+	status = acpi_evaluate_integer(acpi_dev->handle, METHOD_NAME__SEG, NULL,
+				       &segment);
+	if (ACPI_FAILURE(status) && status != AE_NOT_FOUND)
+		dev_err(&acpi_dev->dev, "can't evaluate _SEG\n");
+
+	return segment;
+}
+
 static void negotiate_os_control(struct acpi_pci_root *root, int *no_aspm)
 {
 	u32 support, control, requested;
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 602eb42..d6c768e 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -19,6 +19,7 @@
 #include <linux/spinlock.h>
 #include <linux/string.h>
 #include <linux/log2.h>
+#include <linux/pci-acpi.h>
 #include <linux/pci-aspm.h>
 #include <linux/pm_wakeup.h>
 #include <linux/interrupt.h>
@@ -4769,7 +4770,7 @@ int pci_get_new_domain_nr(void)
 }
 
 #ifdef CONFIG_PCI_DOMAINS_GENERIC
-void pci_bus_assign_domain_nr(struct pci_bus *bus, struct device *parent)
+static int of_pci_bus_domain_nr(struct device *parent)
 {
 	static int use_dt_domains = -1;
 	int domain = of_get_pci_domain_nr(parent->of_node);
@@ -4811,7 +4812,13 @@ void pci_bus_assign_domain_nr(struct pci_bus *bus, struct device *parent)
 		domain = -1;
 	}
 
-	bus->domain_nr = domain;
+	return domain;
+}
+
+void pci_bus_assign_domain_nr(struct pci_bus *bus, struct device *parent)
+{
+	bus->domain_nr = acpi_disabled ? of_pci_bus_domain_nr(parent) :
+					 acpi_pci_bus_domain_nr(parent);
 }
 #endif
 #endif
diff --git a/include/linux/pci-acpi.h b/include/linux/pci-acpi.h
index 89ab057..a72e22d 100644
--- a/include/linux/pci-acpi.h
+++ b/include/linux/pci-acpi.h
@@ -22,6 +22,7 @@ static inline acpi_status pci_acpi_remove_pm_notifier(struct acpi_device *dev)
 {
 	return acpi_remove_pm_notifier(dev);
 }
+extern int acpi_pci_bus_domain_nr(struct device *parent);
 extern phys_addr_t acpi_pci_root_get_mcfg_addr(acpi_handle handle);
 
 static inline acpi_handle acpi_find_root_bridge_handle(struct pci_dev *pdev)
@@ -109,6 +110,7 @@ extern const u8 pci_acpi_dsm_uuid[];
 #else	/* CONFIG_ACPI */
 static inline void acpi_pci_add_bus(struct pci_bus *bus) { }
 static inline void acpi_pci_remove_bus(struct pci_bus *bus) { }
+static inline int acpi_pci_bus_domain_nr(struct device *parent) { return -1; }
 #endif	/* CONFIG_ACPI */
 
 #ifdef CONFIG_ACPI_APEI
-- 
1.9.1

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#1327048 — [PATCH V4 06/23] XEN / PCI: Remove the dependence on arch x86 when PCI_MMCONFIG=y

From	Tomasz Nowicki <tn@semihalf.com>
Date	2016-02-04 18:40 +0100
Subject	[PATCH V4 06/23] XEN / PCI: Remove the dependence on arch x86 when PCI_MMCONFIG=y
Message-ID	<qYw2S-57e-13@gated-at.bofh.it>
In reply to	#1327039

In drivers/xen/pci.c, there are arch x86 dependent codes when
CONFIG_PCI_MMCONFIG is enabled, since CONFIG_PCI_MMCONFIG
depends on ACPI, so this will prevent XEN PCI running on other
architectures using ACPI with PCI_MMCONFIG enabled (such as ARM64).

Fortunatly, it can be sloved in a simple way. In drivers/xen/pci.c,
the only x86 dependent code is if ((pci_probe & PCI_PROBE_MMCONF) == 0),
and it's defined in asm/pci_x86.h, the code means that
if the PCI resource is not probed in PCI_PROBE_MMCONF way, just
ingnore the xen mcfg init. Actually this is duplicate, because
if PCI resource is not probed in PCI_PROBE_MMCONF way, the
pci_mmconfig_list will be empty, and the if (list_empty())
after it will do the same job.

So just remove the arch related code and the head file, this
will be no functional change for x86, and also makes xen/pci.c
usable for other architectures.

Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org>
CC: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
CC: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: Stefano Stabellini <Stefano.Stabellini@eu.citrix.com>
Tested-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com>
Tested-by: Jeremy Linton <jeremy.linton@arm.com>
Tested-by: Duc Dang <dhdang@apm.com>
Tested-by: Dongdong Liu <liudongdong3@huawei.com>
Tested-by: Hanjun Guo <hanjun.guo@linaro.org>
Tested-by: Graeme Gregory <graeme.gregory@linaro.org>
Tested-by: Sinan Kaya <okaya@codeaurora.org>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Acked-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
---
 drivers/xen/pci.c | 6 ------
 1 file changed, 6 deletions(-)

diff --git a/drivers/xen/pci.c b/drivers/xen/pci.c
index 6785ebb..9a8dbe3 100644
--- a/drivers/xen/pci.c
+++ b/drivers/xen/pci.c
@@ -28,9 +28,6 @@
 #include <asm/xen/hypervisor.h>
 #include <asm/xen/hypercall.h>
 #include "../pci/pci.h"
-#ifdef CONFIG_PCI_MMCONFIG
-#include <asm/pci_x86.h>
-#endif
 
 static bool __read_mostly pci_seg_supported = true;
 
@@ -222,9 +219,6 @@ static int __init xen_mcfg_late(void)
 	if (!xen_initial_domain())
 		return 0;
 
-	if ((pci_probe & PCI_PROBE_MMCONF) == 0)
-		return 0;
-
 	if (list_empty(&pci_mmcfg_list))
 		return 0;
 
-- 
1.9.1

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#1327049 — [PATCH V4 10/23] x86, pci: Cleanup platform specific MCFG data by using ECAM hot_added flag.

From	Tomasz Nowicki <tn@semihalf.com>
Date	2016-02-04 18:40 +0100
Subject	[PATCH V4 10/23] x86, pci: Cleanup platform specific MCFG data by using ECAM hot_added flag.
Message-ID	<qYw2S-57e-11@gated-at.bofh.it>
In reply to	#1327039

Because of two facts:
1. MCFG region has hot_added flag
2. struct acpi_pci_root has topology info (domain, bus number)
we can get rid of arch specific mcfg data from x86 struct pci_root_info.

Signed-off-by: Tomasz Nowicki <tn@semihalf.com>
Tested-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com>
Tested-by: Duc Dang <dhdang@apm.com>
Tested-by: Dongdong Liu <liudongdong3@huawei.com>
Tested-by: Hanjun Guo <hanjun.guo@linaro.org>
Tested-by: Graeme Gregory <graeme.gregory@linaro.org>
Tested-by: Sinan Kaya <okaya@codeaurora.org>
---
 arch/x86/pci/acpi.c | 36 ++++++++++++++----------------------
 1 file changed, 14 insertions(+), 22 deletions(-)

diff --git a/arch/x86/pci/acpi.c b/arch/x86/pci/acpi.c
index a997d7c..8e89921 100644
--- a/arch/x86/pci/acpi.c
+++ b/arch/x86/pci/acpi.c
@@ -12,11 +12,6 @@
 struct pci_root_info {
 	struct acpi_pci_root_info common;
 	struct pci_sysdata sd;
-#ifdef	CONFIG_PCI_MMCONFIG
-	bool mcfg_added;
-	u8 start_bus;
-	u8 end_bus;
-#endif
 };
 
 static bool pci_use_crs = true;
@@ -180,16 +175,13 @@ static int check_segment(u16 seg, struct device *dev, char *estr)
 
 static int setup_mcfg_map(struct acpi_pci_root_info *ci)
 {
-	int result, seg;
-	struct pci_root_info *info;
+	int result, seg, start, end;
 	struct acpi_pci_root *root = ci->root;
 	struct device *dev = &ci->bridge->dev;
 
-	info = container_of(ci, struct pci_root_info, common);
-	info->start_bus = (u8)root->secondary.start;
-	info->end_bus = (u8)root->secondary.end;
-	info->mcfg_added = false;
-	seg = info->sd.domain;
+	seg = root->segment;
+	start = root->secondary.start;
+	end = root->secondary.end;
 
 	/* return success if MMCFG is not in use */
 	if (raw_pci_ext_ops && raw_pci_ext_ops != &pci_mmcfg)
@@ -198,13 +190,11 @@ static int setup_mcfg_map(struct acpi_pci_root_info *ci)
 	if (!(pci_probe & PCI_PROBE_MMCONF))
 		return check_segment(seg, dev, "MMCONFIG is disabled,");
 
-	result = pci_mmconfig_insert(dev, seg, info->start_bus, info->end_bus,
-				     root->mcfg_addr);
+	result = pci_mmconfig_insert(dev, seg, start, end, root->mcfg_addr);
 	if (result == 0) {
 		/* enable MMCFG if it hasn't been enabled yet */
 		if (raw_pci_ext_ops == NULL)
 			raw_pci_ext_ops = &pci_mmcfg;
-		info->mcfg_added = true;
 	} else if (result != -EEXIST)
 		return check_segment(seg, dev,
 			 "fail to add MMCONFIG information,");
@@ -214,14 +204,16 @@ static int setup_mcfg_map(struct acpi_pci_root_info *ci)
 
 static void teardown_mcfg_map(struct acpi_pci_root_info *ci)
 {
-	struct pci_root_info *info;
+	struct acpi_pci_root *root = ci->root;
+	struct pci_mmcfg_region *cfg;
 
-	info = container_of(ci, struct pci_root_info, common);
-	if (info->mcfg_added) {
-		pci_mmconfig_delete(info->sd.domain,
-				    info->start_bus, info->end_bus);
-		info->mcfg_added = false;
-	}
+	cfg = pci_mmconfig_lookup(root->segment, root->secondary.start);
+	if (!cfg)
+		return;
+
+	if (cfg->hot_added)
+		pci_mmconfig_delete(root->segment, root->secondary.start,
+				    root->secondary.end);
 }
 #else
 static int setup_mcfg_map(struct acpi_pci_root_info *ci)
-- 
1.9.1

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#1327050 — [PATCH V4 07/23] pci, acpi, mcfg: Provide default RAW ACPI PCI config space accessors.

From	Tomasz Nowicki <tn@semihalf.com>
Date	2016-02-04 18:40 +0100
Subject	[PATCH V4 07/23] pci, acpi, mcfg: Provide default RAW ACPI PCI config space accessors.
Message-ID	<qYw2S-57e-19@gated-at.bofh.it>
In reply to	#1327039

Lets keep RAW ACPI PCI config space accessors empty by default,
since we are note sure if they are necessary accross all archs.
Once we sort this out, we can provide generic version or let
architectures to overwrite, like now x86.

Suggested-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Tomasz Nowicki <tn@semihalf.com>
Tested-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com>
Tested-by: Jeremy Linton <jeremy.linton@arm.com>
Tested-by: Duc Dang <dhdang@apm.com>
Tested-by: Dongdong Liu <liudongdong3@huawei.com>
Tested-by: Hanjun Guo <hanjun.guo@linaro.org>
Tested-by: Graeme Gregory <graeme.gregory@linaro.org>
Tested-by: Sinan Kaya <okaya@codeaurora.org>
---
 drivers/acpi/mcfg.c | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/drivers/acpi/mcfg.c b/drivers/acpi/mcfg.c
index 745b83e..3e1e7be 100644
--- a/drivers/acpi/mcfg.c
+++ b/drivers/acpi/mcfg.c
@@ -9,9 +9,30 @@
 
 #include <linux/acpi.h>
 #include <linux/ecam.h>
+#include <linux/pci.h>
 
 #define	PREFIX	"MCFG: "
 
+/*
+ * raw_pci_read/write - raw ACPI PCI config space accessors.
+ *
+ * By defauly (__weak) these accessors are empty and should be overwritten
+ * by architectures which support operations on ACPI PCI_Config regions,
+ * see osl.c file.
+ */
+
+int __weak raw_pci_read(unsigned int domain, unsigned int bus,
+			unsigned int devfn, int reg, int len, u32 *val)
+{
+	return PCIBIOS_DEVICE_NOT_FOUND;
+}
+
+int __weak raw_pci_write(unsigned int domain, unsigned int bus,
+			 unsigned int devfn, int reg, int len, u32 val)
+{
+	return PCIBIOS_DEVICE_NOT_FOUND;
+}
+
 int __init acpi_parse_mcfg(struct acpi_table_header *header)
 {
 	struct acpi_table_mcfg *mcfg;
-- 
1.9.1

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#1327051 — [PATCH V4 16/23] x86, acpi, pci: Use equivalent function from mcfg.c driver.

From	Tomasz Nowicki <tn@semihalf.com>
Date	2016-02-04 18:40 +0100
Subject	[PATCH V4 16/23] x86, acpi, pci: Use equivalent function from mcfg.c driver.
Message-ID	<qYw2S-57e-17@gated-at.bofh.it>
In reply to	#1327039

Since mcfg.c driver provides the same function lets use it and remove
code duplication.

Signed-off-by: Tomasz Nowicki <tn@semihalf.com>
Tested-by: Duc Dang <dhdang@apm.com>
Tested-by: Dongdong Liu <liudongdong3@huawei.com>
Tested-by: Hanjun Guo <hanjun.guo@linaro.org>
Tested-by: Graeme Gregory <graeme.gregory@linaro.org>
Tested-by: Sinan Kaya <okaya@codeaurora.org>
---
 arch/x86/pci/acpi.c | 20 +-------------------
 1 file changed, 1 insertion(+), 19 deletions(-)

diff --git a/arch/x86/pci/acpi.c b/arch/x86/pci/acpi.c
index d5086d1..b4e72b5 100644
--- a/arch/x86/pci/acpi.c
+++ b/arch/x86/pci/acpi.c
@@ -201,29 +201,11 @@ static int setup_mcfg_map(struct acpi_pci_root_info *ci)
 
 	return 0;
 }
-
-static void teardown_mcfg_map(struct acpi_pci_root_info *ci)
-{
-	struct acpi_pci_root *root = ci->root;
-	struct pci_mmcfg_region *cfg;
-
-	cfg = pci_mmconfig_lookup(root->segment, root->secondary.start);
-	if (!cfg)
-		return;
-
-	if (cfg->hot_added)
-		pci_mmconfig_delete(root->segment, root->secondary.start,
-				    root->secondary.end);
-}
 #else
 static int setup_mcfg_map(struct acpi_pci_root_info *ci)
 {
 	return 0;
 }
-
-static void teardown_mcfg_map(struct acpi_pci_root_info *ci)
-{
-}
 #endif
 
 static int pci_acpi_root_get_node(struct acpi_pci_root *root)
@@ -251,7 +233,7 @@ static int pci_acpi_root_init_info(struct acpi_pci_root_info *ci)
 
 static void pci_acpi_root_release_info(struct acpi_pci_root_info *ci)
 {
-	teardown_mcfg_map(ci);
+	pci_mmcfg_teardown_map(ci);
 	kfree(container_of(ci, struct pci_root_info, common));
 }
 
-- 
1.9.1

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#1327052 — [PATCH V4 21/23] pci, acpi: Match PCI config space accessors against platfrom specific quirks.

From	Tomasz Nowicki <tn@semihalf.com>
Date	2016-02-04 18:40 +0100
Subject	[PATCH V4 21/23] pci, acpi: Match PCI config space accessors against platfrom specific quirks.
Message-ID	<qYw2S-57e-15@gated-at.bofh.it>
In reply to	#1327039

Some platforms may not be fully compliant with generic set of PCI config
accessors. For these cases we implement the way to overwrite accessors
set prior to PCI buses enumeration. Algorithm traverses available quirk
list, matches against <platform ID (DMI), domain, bus number> tuple and
returns corresponding accessors. All quirks can be defined using:
DECLARE_ACPI_MCFG_FIXUP() and kept self contained. Example,

static const struct dmi_system_id foo_dmi[] = {
        {
                .ident = "<Platform ident string>",
                .callback = <handler>,
                .matches = {
                        DMI_MATCH(DMI_SYS_VENDOR, "<system vendor>"),
                        DMI_MATCH(DMI_PRODUCT_NAME, "<product name>"),
                        DMI_MATCH(DMI_PRODUCT_VERSION, "product version"),
                },
        },
        { }
};

static struct pci_ops foo_ecam_pci_ops = {
        .map_bus = pci_mcfg_dev_base,
        .read = foo_ecam_config_read,
        .write = foo_ecam_config_write,
};
DECLARE_ACPI_MCFG_FIXUP(foo_dmi, NULL, &foo_ecam_pci_ops, <domain_nr>, <bus_nr>);

More custom (non-DMI) matching can be done via an extra call.
Note that there is possibility to assign quirk related private data to
root->sysdata which will be available along read/wriate accessor, example:

static int boo_match(struct pci_mcfg_fixup *fixup, struct acpi_pci_root *root)
{
        return [condition] ? 1 : 0;
}

int boo_ecam_config_read(struct pci_bus *bus, unsigned int devfn,
                          int where, int size, u32 *val)
{
        struct acpi_pci_root *root = bus->sysdata;
        struct boo_priv_data *boo_data = root->sysdata;

        [..]
}

static struct pci_ops boo_ecam_pci_ops = {
	.map_bus = pci_mcfg_dev_base,
	.read = boo_ecam_config_read,
	.write = boo_ecam_config_write,
};
DECLARE_ACPI_MCFG_FIXUP(NULL, boo_match, &boo_ecam_pci_ops, <domain_nr>, <bus_nr>);

Signed-off-by: Tomasz Nowicki <tn@semihalf.com>
Tested-by: Duc Dang <dhdang@apm.com>
Tested-by: Dongdong Liu <liudongdong3@huawei.com>
Tested-by: Hanjun Guo <hanjun.guo@linaro.org>
Tested-by: Graeme Gregory <graeme.gregory@linaro.org>
Tested-by: Sinan Kaya <okaya@codeaurora.org>
---
 drivers/acpi/mcfg.c               | 33 +++++++++++++++++++++++++++++++--
 include/acpi/acpi_bus.h           |  1 +
 include/asm-generic/vmlinux.lds.h |  7 +++++++
 include/linux/ecam.h              | 18 ++++++++++++++++++
 4 files changed, 57 insertions(+), 2 deletions(-)

diff --git a/drivers/acpi/mcfg.c b/drivers/acpi/mcfg.c
index dfc2d14..4663f70 100644
--- a/drivers/acpi/mcfg.c
+++ b/drivers/acpi/mcfg.c
@@ -8,6 +8,7 @@
  */
 
 #include <linux/acpi.h>
+#include <linux/dmi.h>
 #include <linux/ecam.h>
 #include <linux/pci.h>
 #include <linux/pci-acpi.h>
@@ -34,6 +35,29 @@ int __weak raw_pci_write(unsigned int domain, unsigned int bus,
 	return PCIBIOS_DEVICE_NOT_FOUND;
 }
 
+extern struct pci_mcfg_fixup __start_acpi_mcfg_fixups[];
+extern struct pci_mcfg_fixup __end_acpi_mcfg_fixups[];
+
+static struct pci_ops *pci_mcfg_check_quirks(struct acpi_pci_root *root)
+{
+	struct pci_mcfg_fixup *f;
+	int bus_num = root->secondary.start;
+	int domain = root->segment;
+
+	/*
+	 * First match against PCI topology <domain:bus> then use DMI or
+	 * custom match handler.
+	 */
+	for (f = __start_acpi_mcfg_fixups; f < __end_acpi_mcfg_fixups; f++) {
+		if ((f->domain == domain || f->domain == PCI_MCFG_DOMAIN_ANY) &&
+		    (f->bus_num == bus_num || f->bus_num == PCI_MCFG_BUS_ANY) &&
+		    (f->system ? dmi_check_system(f->system) : 1 &&
+		     f->match ? f->match(f, root) : 1))
+			return f->ops;
+	}
+	return NULL;
+}
+
 void __iomem *
 pci_mcfg_dev_base(struct pci_bus *bus, unsigned int devfn, int offset)
 {
@@ -56,10 +80,15 @@ static struct pci_ops default_pci_mcfg_ops = {
 
 struct pci_ops *pci_mcfg_get_ops(struct acpi_pci_root *root)
 {
+	struct pci_ops *pci_mcfg_ops_quirk;
+
 	/*
-	 * TODO: Match against platform specific quirks and return
-	 * corresponding PCI config space accessor set.
+	 * Match against platform specific quirks and return corresponding
+	 * PCI config space accessor set.
 	 */
+	pci_mcfg_ops_quirk = pci_mcfg_check_quirks(root);
+	if (pci_mcfg_ops_quirk)
+		return pci_mcfg_ops_quirk;
 
 	return &default_pci_mcfg_ops;
 }
diff --git a/include/acpi/acpi_bus.h b/include/acpi/acpi_bus.h
index 14362a8..0fc6f13 100644
--- a/include/acpi/acpi_bus.h
+++ b/include/acpi/acpi_bus.h
@@ -556,6 +556,7 @@ struct acpi_pci_root {
 	struct pci_bus *bus;
 	u16 segment;
 	struct resource secondary;	/* downstream bus range */
+	void *sysdata;
 
 	u32 osc_support_set;	/* _OSC state of support bits */
 	u32 osc_control_set;	/* _OSC state of control bits */
diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
index c4bd0e2..c93fc97 100644
--- a/include/asm-generic/vmlinux.lds.h
+++ b/include/asm-generic/vmlinux.lds.h
@@ -298,6 +298,13 @@
 		VMLINUX_SYMBOL(__end_pci_fixups_suspend_late) = .;	\
 	}								\
 									\
+	/* ACPI MCFG quirks */						\
+	.acpi_fixup        : AT(ADDR(.acpi_fixup) - LOAD_OFFSET) {	\
+		VMLINUX_SYMBOL(__start_acpi_mcfg_fixups) = .;		\
+		*(.acpi_fixup_mcfg)					\
+		VMLINUX_SYMBOL(__end_acpi_mcfg_fixups) = .;		\
+	}								\
+									\
 	/* Built-in firmware blobs */					\
 	.builtin_fw        : AT(ADDR(.builtin_fw) - LOAD_OFFSET) {	\
 		VMLINUX_SYMBOL(__start_builtin_fw) = .;			\
diff --git a/include/linux/ecam.h b/include/linux/ecam.h
index e0f322e..21215be 100644
--- a/include/linux/ecam.h
+++ b/include/linux/ecam.h
@@ -20,6 +20,24 @@ struct pci_mmcfg_region {
 	bool hot_added;
 };
 
+struct pci_mcfg_fixup {
+	const struct dmi_system_id *system;
+	int (*match)(struct pci_mcfg_fixup *, struct acpi_pci_root *);
+	struct pci_ops *ops;
+	int domain;
+	int bus_num;
+};
+
+#define PCI_MCFG_DOMAIN_ANY	-1
+#define PCI_MCFG_BUS_ANY	-1
+
+/* Designate a routine to fix up buggy MCFG */
+#define DECLARE_ACPI_MCFG_FIXUP(system, match, ops, dom, bus)		\
+	static const struct pci_mcfg_fixup __mcfg_fixup_##system##dom##bus\
+	 __used	__attribute__((__section__(".acpi_fixup_mcfg"),		\
+				aligned((sizeof(void *))))) =		\
+	{ system, match, ops, dom, bus };
+
 struct pci_mmcfg_region *pci_mmconfig_lookup(int segment, int bus);
 struct pci_mmcfg_region *pci_mmconfig_alloc(int segment, int start,
 						   int end, u64 addr);
-- 
1.9.1

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#1327053 — [PATCH V4 03/23] pci, acpi, mcfg: Provide generic implementation of MCFG code initialization.

From	Tomasz Nowicki <tn@semihalf.com>
Date	2016-02-04 18:40 +0100
Subject	[PATCH V4 03/23] pci, acpi, mcfg: Provide generic implementation of MCFG code initialization.
Message-ID	<qYw2S-57e-21@gated-at.bofh.it>
In reply to	#1327039

First function acpi_mcfg_check_entry() does not apply any quirks by default.

Last two functions are required by ACPI subsystem to make PCI config
space accessible. Generic code assume to do nothing for early init call but
late init call does as follow:
- parse MCFG table and add regions to ECAM resource list
- map regions
- add regions to iomem_resource

Signed-off-by: Tomasz Nowicki <tn@semihalf.com>
Tested-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com>
Tested-by: Jeremy Linton <jeremy.linton@arm.com>
Tested-by: Duc Dang <dhdang@apm.com>
Tested-by: Dongdong Liu <liudongdong3@huawei.com>
Tested-by: Hanjun Guo <hanjun.guo@linaro.org>
Tested-by: Graeme Gregory <graeme.gregory@linaro.org>
Tested-by: Sinan Kaya <okaya@codeaurora.org>
---
 drivers/acpi/mcfg.c | 26 ++++++++++++++++++++++++++
 1 file changed, 26 insertions(+)

diff --git a/drivers/acpi/mcfg.c b/drivers/acpi/mcfg.c
index 5ecef20..fad9917 100644
--- a/drivers/acpi/mcfg.c
+++ b/drivers/acpi/mcfg.c
@@ -57,3 +57,29 @@ int __init acpi_parse_mcfg(struct acpi_table_header *header)
 
 	return 0;
 }
+
+int __init __weak acpi_mcfg_check_entry(struct acpi_table_mcfg *mcfg,
+					struct acpi_mcfg_allocation *cfg)
+{
+	return 0;
+}
+
+void __init __weak pci_mmcfg_early_init(void)
+{
+
+}
+
+void __init __weak pci_mmcfg_late_init(void)
+{
+	struct pci_mmcfg_region *cfg;
+
+	acpi_table_parse(ACPI_SIG_MCFG, acpi_parse_mcfg);
+
+	if (list_empty(&pci_mmcfg_list))
+		return;
+	if (!pci_mmcfg_arch_init())
+		free_all_mmcfg();
+
+	list_for_each_entry(cfg, &pci_mmcfg_list, list)
+		insert_resource(&iomem_resource, &cfg->res);
+}
-- 
1.9.1

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#1327054 — [PATCH V4 09/23] pci, acpi, ecam: Add flag to indicate whether ECAM region was hot added or not.

From	Tomasz Nowicki <tn@semihalf.com>
Date	2016-02-04 18:40 +0100
Subject	[PATCH V4 09/23] pci, acpi, ecam: Add flag to indicate whether ECAM region was hot added or not.
Message-ID	<qYw2S-57e-23@gated-at.bofh.it>
In reply to	#1327039

There are two ways we can get ECAM (aka MCFG) regions using ACPI,
from MCFG static table and from _CBA method. We cannot remove static
regions, however regions coming from _CBA should be removed while removing
bridge device.

In the light of above we need flag to mark hot added ECAM entries
so that user should use pci_mmconfig_inject while adding regions from
_CBA method.

Signed-off-by: Tomasz Nowicki <tn@semihalf.com>
Tested-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com>
Tested-by: Jeremy Linton <jeremy.linton@arm.com>
Tested-by: Duc Dang <dhdang@apm.com>
Tested-by: Dongdong Liu <liudongdong3@huawei.com>
Tested-by: Hanjun Guo <hanjun.guo@linaro.org>
Tested-by: Graeme Gregory <graeme.gregory@linaro.org>
Tested-by: Sinan Kaya <okaya@codeaurora.org>
---
 drivers/pci/ecam.c   | 2 ++
 include/linux/ecam.h | 1 +
 2 files changed, 3 insertions(+)

diff --git a/drivers/pci/ecam.c b/drivers/pci/ecam.c
index 7bc75af..fea5700 100644
--- a/drivers/pci/ecam.c
+++ b/drivers/pci/ecam.c
@@ -131,6 +131,7 @@ struct pci_mmcfg_region *pci_mmconfig_alloc(int segment, int start,
 	new->segment = segment;
 	new->start_bus = start;
 	new->end_bus = end;
+	new->hot_added = false;
 
 	res = &new->res;
 	res->start = addr + PCI_MMCFG_BUS_OFFSET(start);
@@ -221,6 +222,7 @@ int pci_mmconfig_inject(struct pci_mmcfg_region *cfg)
 		err = -ENOMEM;
 		goto out;
 	} else {
+		cfg->hot_added = true;
 		list_add_sorted(cfg);
 		pr_info("MMCONFIG at %pR (base %#lx)\n",
 			&cfg->res, (unsigned long)cfg->address);
diff --git a/include/linux/ecam.h b/include/linux/ecam.h
index 813acd1..e0f322e 100644
--- a/include/linux/ecam.h
+++ b/include/linux/ecam.h
@@ -17,6 +17,7 @@ struct pci_mmcfg_region {
 	u8 start_bus;
 	u8 end_bus;
 	char name[PCI_MMCFG_RESOURCE_NAME_LEN];
+	bool hot_added;
 };
 
 struct pci_mmcfg_region *pci_mmconfig_lookup(int segment, int bus);
-- 
1.9.1

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#1327057 — [PATCH V4 23/23] arm64, pci, acpi: Start using ACPI based PCI host bridge driver for ARM64.

From	Tomasz Nowicki <tn@semihalf.com>
Date	2016-02-04 18:40 +0100
Subject	[PATCH V4 23/23] arm64, pci, acpi: Start using ACPI based PCI host bridge driver for ARM64.
Message-ID	<qYw2T-57e-35@gated-at.bofh.it>
In reply to	#1327039

Lets get rid of empty PCI init stub, related ACPI header and
go with full-blown PCI host bridge driver.

Signed-off-by: Tomasz Nowicki <tn@semihalf.com>
CC: Arnd Bergmann <arnd@arndb.de>
CC: Catalin Marinas <catalin.marinas@arm.com>
CC: Liviu Dudau <Liviu.Dudau@arm.com>
CC: Lorenzo Pieralisi <Lorenzo.Pieralisi@arm.com>
CC: Will Deacon <will.deacon@arm.com>
Tested-by: Duc Dang <dhdang@apm.com>
Tested-by: Dongdong Liu <liudongdong3@huawei.com>
Tested-by: Hanjun Guo <hanjun.guo@linaro.org>
Tested-by: Graeme Gregory <graeme.gregory@linaro.org>
Tested-by: Sinan Kaya <okaya@codeaurora.org>
---
 arch/arm64/Kconfig      | 1 +
 arch/arm64/kernel/pci.c | 9 ---------
 2 files changed, 1 insertion(+), 9 deletions(-)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 4f45ea4..567523b 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -2,6 +2,7 @@ config ARM64
 	def_bool y
 	select ACPI_CCA_REQUIRED if ACPI
 	select ACPI_GENERIC_GSI if ACPI
+	select ACPI_PCI_HOST_GENERIC if ACPI
 	select ACPI_REDUCED_HARDWARE_ONLY if ACPI
 	select ARCH_HAS_DEVMEM_IS_ALLOWED
 	select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
diff --git a/arch/arm64/kernel/pci.c b/arch/arm64/kernel/pci.c
index d1a701f..0b53262 100644
--- a/arch/arm64/kernel/pci.c
+++ b/arch/arm64/kernel/pci.c
@@ -70,12 +70,3 @@ int pcibios_add_device(struct pci_dev *dev)
 
 	return 0;
 }
-
-#ifdef CONFIG_ACPI
-/* Root bridge scanning */
-struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
-{
-	/* TODO: Should be revisited when implementing PCI on ACPI */
-	return NULL;
-}
-#endif
-- 
1.9.1

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#1327058 — [PATCH V4 22/23] arm64, pci, acpi: Assign legacy IRQs once device is enable.

From	Tomasz Nowicki <tn@semihalf.com>
Date	2016-02-04 18:40 +0100
Subject	[PATCH V4 22/23] arm64, pci, acpi: Assign legacy IRQs once device is enable.
Message-ID	<qYw2T-57e-39@gated-at.bofh.it>
In reply to	#1327039

This is the last step before enabling generic ACPI PCI host controller
for ARM64. We need to take care of legacy IRQ mapping for non-MSI(X)
PCI devices. pcibios_enable_device() boot order is not sensitive to
ACPI device enumeration, so it is the best place to assign device's IRQs.

NOTE: *This is going to be temporary solution*. There is ongoing work
which aims for cleaning legacy IRQ allocation, see [1].
We can consider this patch as the necessary evil which will be removed
once [1] series hits mailnline in the near future.

1. http://comments.gmane.org/gmane.linux.kernel.pci/46461

Signed-off-by: Tomasz Nowicki <tn@semihalf.com>
---
 arch/arm64/kernel/pci.c | 14 ++++++++++++--
 1 file changed, 12 insertions(+), 2 deletions(-)

diff --git a/arch/arm64/kernel/pci.c b/arch/arm64/kernel/pci.c
index 023b983..d1a701f 100644
--- a/arch/arm64/kernel/pci.c
+++ b/arch/arm64/kernel/pci.c
@@ -39,16 +39,26 @@ resource_size_t pcibios_align_resource(void *data, const struct resource *res,
 }
 
 /**
- * pcibios_enable_device - Enable I/O and memory.
+ * pcibios_enable_device - Enable I/O, memory and legacy IRQs for ACPI.
  * @dev: PCI device to be enabled
  * @mask: bitmask of BARs to enable
  */
 int pcibios_enable_device(struct pci_dev *dev, int mask)
 {
+	int ret;
+
 	if (pci_has_flag(PCI_PROBE_ONLY))
 		return 0;
 
-	return pci_enable_resources(dev, mask);
+	ret = pci_enable_resources(dev, mask);
+	if (ret < 0)
+		return ret;
+
+#ifdef CONFIG_ACPI
+	if (!pci_dev_msi_enabled(dev))
+		return acpi_pci_irq_enable(dev);
+#endif
+	return 0;
 }
 
 /*
-- 
1.9.1

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#1327059 — [PATCH V4 01/23] x86, pci: Reorder logic of pci_mmconfig_insert() function

From	Tomasz Nowicki <tn@semihalf.com>
Date	2016-02-04 18:40 +0100
Subject	[PATCH V4 01/23] x86, pci: Reorder logic of pci_mmconfig_insert() function
Message-ID	<qYw2T-57e-43@gated-at.bofh.it>
In reply to	#1327039

This patch is the first step for MMCONFIG refactoring process.

Code that uses pci_mmcfg_lock will be moved to common file and become
accessible for all architectures. pci_mmconfig_insert() cannot be moved
so easily since it is mixing generic mmconfig code with x86 specific logic
inside of mutual exclusive block guarded by pci_mmcfg_lock.

To get rid of that constraint, we reorder actions as follow:
1. sanity check for mmconfig region presence, if we already have such
region it doesn't make snese to alloc new mmconfig list entry
2. mmconfig entry allocation, no need to lock
3. insertion to iomem_resource has its own lock, no need to wrap it into mutex
4. insertion to mmconfig list can be done as the final step in separate
function (candidate for further refactoring) and needs another mmconfig
lookup to avoid race condition.

Signed-off-by: Tomasz Nowicki <tomasz.nowicki@linaro.org>
Tested-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com>
Tested-by: Jeremy Linton <jeremy.linton@arm.com>
Tested-by: Duc Dang <dhdang@apm.com>
Tested-by: Dongdong Liu <liudongdong3@huawei.com>
Tested-by: Hanjun Guo <hanjun.guo@linaro.org>
Tested-by: Graeme Gregory <graeme.gregory@linaro.org>
Tested-by: Sinan Kaya <okaya@codeaurora.org>
---
 arch/x86/pci/mmconfig-shared.c | 101 +++++++++++++++++++++++------------------
 1 file changed, 58 insertions(+), 43 deletions(-)

diff --git a/arch/x86/pci/mmconfig-shared.c b/arch/x86/pci/mmconfig-shared.c
index dd30b7e..c8bb9b0 100644
--- a/arch/x86/pci/mmconfig-shared.c
+++ b/arch/x86/pci/mmconfig-shared.c
@@ -720,6 +720,38 @@ static int __init pci_mmcfg_late_insert_resources(void)
  */
 late_initcall(pci_mmcfg_late_insert_resources);
 
+static int pci_mmconfig_inject(struct pci_mmcfg_region *cfg)
+{
+	struct pci_mmcfg_region *cfg_conflict;
+	int err = 0;
+
+	mutex_lock(&pci_mmcfg_lock);
+	cfg_conflict = pci_mmconfig_lookup(cfg->segment, cfg->start_bus);
+	if (cfg_conflict) {
+		if (cfg_conflict->end_bus < cfg->end_bus)
+			pr_info(FW_INFO "MMCONFIG for "
+				"domain %04x [bus %02x-%02x] "
+				"only partially covers this bridge\n",
+				cfg_conflict->segment, cfg_conflict->start_bus,
+				cfg_conflict->end_bus);
+		err = -EEXIST;
+		goto out;
+	}
+
+	if (pci_mmcfg_arch_map(cfg)) {
+		pr_warn("fail to map MMCONFIG %pR.\n", &cfg->res);
+		err = -ENOMEM;
+		goto out;
+	} else {
+		list_add_sorted(cfg);
+		pr_info("MMCONFIG at %pR (base %#lx)\n",
+			&cfg->res, (unsigned long)cfg->address);
+	}
+out:
+	mutex_unlock(&pci_mmcfg_lock);
+	return err;
+}
+
 /* Add MMCFG information for host bridges */
 int pci_mmconfig_insert(struct device *dev, u16 seg, u8 start, u8 end,
 			phys_addr_t addr)
@@ -734,63 +766,46 @@ int pci_mmconfig_insert(struct device *dev, u16 seg, u8 start, u8 end,
 	if (start > end)
 		return -EINVAL;
 
-	mutex_lock(&pci_mmcfg_lock);
+	rcu_read_lock();
 	cfg = pci_mmconfig_lookup(seg, start);
-	if (cfg) {
-		if (cfg->end_bus < end)
-			dev_info(dev, FW_INFO
-				 "MMCONFIG for "
-				 "domain %04x [bus %02x-%02x] "
-				 "only partially covers this bridge\n",
-				  cfg->segment, cfg->start_bus, cfg->end_bus);
-		mutex_unlock(&pci_mmcfg_lock);
+	rcu_read_unlock();
+	if (cfg)
 		return -EEXIST;
-	}
 
-	if (!addr) {
-		mutex_unlock(&pci_mmcfg_lock);
+	if (!addr)
 		return -EINVAL;
-	}
 
-	rc = -EBUSY;
 	cfg = pci_mmconfig_alloc(seg, start, end, addr);
-	if (cfg == NULL) {
+	if (!cfg) {
 		dev_warn(dev, "fail to add MMCONFIG (out of memory)\n");
-		rc = -ENOMEM;
-	} else if (!pci_mmcfg_check_reserved(dev, cfg, 0)) {
+		return -ENOMEM;
+	}
+
+	rc = -EBUSY;
+	if (!pci_mmcfg_check_reserved(dev, cfg, 0)) {
 		dev_warn(dev, FW_BUG "MMCONFIG %pR isn't reserved\n",
 			 &cfg->res);
-	} else {
-		/* Insert resource if it's not in boot stage */
-		if (pci_mmcfg_running_state)
-			tmp = insert_resource_conflict(&iomem_resource,
-						       &cfg->res);
-
-		if (tmp) {
-			dev_warn(dev,
-				 "MMCONFIG %pR conflicts with "
-				 "%s %pR\n",
-				 &cfg->res, tmp->name, tmp);
-		} else if (pci_mmcfg_arch_map(cfg)) {
-			dev_warn(dev, "fail to map MMCONFIG %pR.\n",
-				 &cfg->res);
-		} else {
-			list_add_sorted(cfg);
-			dev_info(dev, "MMCONFIG at %pR (base %#lx)\n",
-				 &cfg->res, (unsigned long)addr);
-			cfg = NULL;
-			rc = 0;
-		}
+		goto error;
 	}
 
-	if (cfg) {
-		if (cfg->res.parent)
-			release_resource(&cfg->res);
-		kfree(cfg);
+	/* Insert resource if it's not in boot stage */
+	if (pci_mmcfg_running_state)
+		tmp = insert_resource_conflict(&iomem_resource, &cfg->res);
+
+	if (tmp) {
+		dev_warn(dev, "MMCONFIG %pR conflicts with %s %pR\n",
+			 &cfg->res, tmp->name, tmp);
+		goto error;
 	}
 
-	mutex_unlock(&pci_mmcfg_lock);
+	rc = pci_mmconfig_inject(cfg);
+	if (!rc)
+		return 0;
 
+error:
+	if (cfg->res.parent)
+		release_resource(&cfg->res);
+	kfree(cfg);
 	return rc;
 }
 
-- 
1.9.1

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#1327061 — [PATCH V4 11/23] pci, acpi: Move ACPI host bridge device companion assignment to core code.

From	Tomasz Nowicki <tn@semihalf.com>
Date	2016-02-04 18:40 +0100
Subject	[PATCH V4 11/23] pci, acpi: Move ACPI host bridge device companion assignment to core code.
Message-ID	<qYw2T-57e-47@gated-at.bofh.it>
In reply to	#1327039

Currently we have two platforms (x86 & ia64) capable of PCI ACPI host
bridge initialization. They both use sysdata to pass down parent
device reference and both rely on NULL parent in pci_create_root_bus()
to validate sysdata content.

It looks hacky and prevents us from getting some firmware specific
info for PCI host controller e.g. PCI bus domain number.
However, we overcome that blocker by passing down parent
device via pci_create_root_bus parameter (as the ACPI device type)
and using ACPI_COMPANION_SET in core code for ACPI boot method.
ACPI_COMPANION_SET is safe to run for all cases DT, ACPI and DT&ACPI.

Suggested-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Tomasz Nowicki <tn@semihalf.com>
Tested-by: Duc Dang <dhdang@apm.com>
Tested-by: Dongdong Liu <liudongdong3@huawei.com>
Tested-by: Hanjun Guo <hanjun.guo@linaro.org>
Tested-by: Graeme Gregory <graeme.gregory@linaro.org>
Tested-by: Sinan Kaya <okaya@codeaurora.org>
---
 drivers/acpi/pci_root.c | 5 ++++-
 drivers/pci/probe.c     | 2 ++
 2 files changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/acpi/pci_root.c b/drivers/acpi/pci_root.c
index ae3fe4e..a65c8c2 100644
--- a/drivers/acpi/pci_root.c
+++ b/drivers/acpi/pci_root.c
@@ -846,7 +846,10 @@ struct pci_bus *acpi_pci_root_create(struct acpi_pci_root *root,
 
 	pci_acpi_root_add_resources(info);
 	pci_add_resource(&info->resources, &root->secondary);
-	bus = pci_create_root_bus(NULL, busnum, ops->pci_ops,
+
+	/* Root bridge device needs to be sure of parent ACPI type */
+	ACPI_COMPANION_SET(&device->dev, device);
+	bus = pci_create_root_bus(&device->dev, busnum, ops->pci_ops,
 				  sysdata, &info->resources);
 	if (!bus)
 		goto out_release_info;
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 6d7ab9b..81dd3a2 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -2100,6 +2100,8 @@ struct pci_bus *pci_create_root_bus(struct device *parent, int bus,
 	bridge->dev.parent = parent;
 	bridge->dev.release = pci_release_host_bridge_dev;
 	dev_set_name(&bridge->dev, "pci%04x:%02x", pci_domain_nr(b), bus);
+	ACPI_COMPANION_SET(&bridge->dev,
+			   parent ? to_acpi_device_node(parent->fwnode) : NULL);
 	error = pcibios_root_bridge_prepare(bridge);
 	if (error) {
 		kfree(bridge);
-- 
1.9.1

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#1327063 — [PATCH V4 15/23] acpi, mcfg: Implement two calls that might be used to inject/remove MCFG region.

From	Tomasz Nowicki <tn@semihalf.com>
Date	2016-02-04 18:40 +0100
Subject	[PATCH V4 15/23] acpi, mcfg: Implement two calls that might be used to inject/remove MCFG region.
Message-ID	<qYw2U-57e-55@gated-at.bofh.it>
In reply to	#1327039

Lets abstract two calls which allow to inject and remove MCFG regions
which may come from DSDT table. These calls will be used for x86 and ARM64
PCI host bridge driver in the later patches.

Signed-off-by: Tomasz Nowicki <tn@semihalf.com>
Tested-by: Duc Dang <dhdang@apm.com>
Tested-by: Dongdong Liu <liudongdong3@huawei.com>
Tested-by: Hanjun Guo <hanjun.guo@linaro.org>
Tested-by: Graeme Gregory <graeme.gregory@linaro.org>
Tested-by: Sinan Kaya <okaya@codeaurora.org>
---
 drivers/acpi/mcfg.c      | 38 ++++++++++++++++++++++++++++++++++++++
 include/linux/pci-acpi.h |  9 +++++++++
 2 files changed, 47 insertions(+)

diff --git a/drivers/acpi/mcfg.c b/drivers/acpi/mcfg.c
index 3e1e7be..dca4c4e 100644
--- a/drivers/acpi/mcfg.c
+++ b/drivers/acpi/mcfg.c
@@ -10,6 +10,7 @@
 #include <linux/acpi.h>
 #include <linux/ecam.h>
 #include <linux/pci.h>
+#include <linux/pci-acpi.h>
 
 #define	PREFIX	"MCFG: "
 
@@ -77,6 +78,43 @@ int __init acpi_parse_mcfg(struct acpi_table_header *header)
 	return 0;
 }
 
+int pci_mmcfg_setup_map(struct acpi_pci_root_info *ci)
+{
+	struct pci_mmcfg_region *cfg;
+	struct acpi_pci_root *root;
+	int seg, start, end, err;
+
+	root = ci->root;
+	seg = root->segment;
+	start = root->secondary.start;
+	end = root->secondary.end;
+
+	cfg = pci_mmconfig_lookup(seg, start);
+	if (cfg)
+		return 0;
+
+	cfg = pci_mmconfig_alloc(seg, start, end, root->mcfg_addr);
+	if (!cfg)
+		return -ENOMEM;
+
+	err = pci_mmconfig_inject(cfg);
+	return err;
+}
+
+void pci_mmcfg_teardown_map(struct acpi_pci_root_info *ci)
+{
+	struct acpi_pci_root *root = ci->root;
+	struct pci_mmcfg_region *cfg;
+
+	cfg = pci_mmconfig_lookup(root->segment, root->secondary.start);
+	if (!cfg)
+		return;
+
+	if (cfg->hot_added)
+		pci_mmconfig_delete(root->segment, root->secondary.start,
+				    root->secondary.end);
+}
+
 int __init __weak acpi_mcfg_check_entry(struct acpi_table_mcfg *mcfg,
 					struct acpi_mcfg_allocation *cfg)
 {
diff --git a/include/linux/pci-acpi.h b/include/linux/pci-acpi.h
index a72e22d..65b91f3 100644
--- a/include/linux/pci-acpi.h
+++ b/include/linux/pci-acpi.h
@@ -80,6 +80,15 @@ extern struct pci_bus *acpi_pci_root_create(struct acpi_pci_root *root,
 void acpi_pci_add_bus(struct pci_bus *bus);
 void acpi_pci_remove_bus(struct pci_bus *bus);
 
+#ifdef	CONFIG_PCI_MMCONFIG
+int pci_mmcfg_setup_map(struct acpi_pci_root_info *ci);
+void pci_mmcfg_teardown_map(struct acpi_pci_root_info *ci);
+#else
+static inline int pci_mmcfg_setup_map(struct acpi_pci_root_info *ci)
+{ return 0; }
+static inline void pci_mmcfg_teardown_map(struct acpi_pci_root_info *ci) { }
+#endif
+
 #ifdef	CONFIG_ACPI_PCI_SLOT
 void acpi_pci_slot_init(void);
 void acpi_pci_slot_enumerate(struct pci_bus *bus);
-- 
1.9.1

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#1327064 — [PATCH V4 08/23] arm64, acpi: Use MCFG and empty PCI config space accessors from mcfg.c file.

From	Tomasz Nowicki <tn@semihalf.com>
Date	2016-02-04 18:40 +0100
Subject	[PATCH V4 08/23] arm64, acpi: Use MCFG and empty PCI config space accessors from mcfg.c file.
Message-ID	<qYw2U-57e-59@gated-at.bofh.it>
In reply to	#1327039

We can now enable MCFG driver and its GENERIC_ECAM_MAP feature.
Currently there is no RAW pci config accessor use case for ARM64,
so lets use empty one for now. At the same time we can cleanup
the old implementation of RAW accessors from arch/arm64/kernel/pci.c

Signed-off-by: Tomasz Nowicki <tn@semihalf.com>
Tested-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@amd.com>
Tested-by: Jeremy Linton <jeremy.linton@arm.com>
Tested-by: Duc Dang <dhdang@apm.com>
Tested-by: Dongdong Liu <liudongdong3@huawei.com>
Tested-by: Hanjun Guo <hanjun.guo@linaro.org>
Tested-by: Graeme Gregory <graeme.gregory@linaro.org>
Tested-by: Sinan Kaya <okaya@codeaurora.org>
---
 arch/arm64/Kconfig      |  7 +++++++
 arch/arm64/kernel/pci.c | 15 ---------------
 2 files changed, 7 insertions(+), 15 deletions(-)

diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
index 8cc6228..4f45ea4 100644
--- a/arch/arm64/Kconfig
+++ b/arch/arm64/Kconfig
@@ -34,6 +34,7 @@ config ARM64
 	select GENERIC_CLOCKEVENTS_BROADCAST
 	select GENERIC_CPU_AUTOPROBE
 	select GENERIC_EARLY_IOREMAP
+	select GENERIC_ECAM_MAP
 	select GENERIC_IDLE_POLL_SETUP
 	select GENERIC_IRQ_PROBE
 	select GENERIC_IRQ_SHOW
@@ -96,6 +97,7 @@ config ARM64
 	select SYSCTL_EXCEPTION_TRACE
 	select HAVE_CONTEXT_TRACKING
 	select HAVE_ARM_SMCCC
+	select HAVE_PCI_ECAM
 	help
 	  ARM 64-bit (AArch64) Linux support.
 
@@ -238,6 +240,11 @@ source "drivers/pci/Kconfig"
 source "drivers/pci/pcie/Kconfig"
 source "drivers/pci/hotplug/Kconfig"
 
+config PCI_MMCONFIG
+	def_bool y
+	select PCI_ECAM
+	depends on ACPI
+
 endmenu
 
 menu "Kernel Features"
diff --git a/arch/arm64/kernel/pci.c b/arch/arm64/kernel/pci.c
index b3d098b..023b983 100644
--- a/arch/arm64/kernel/pci.c
+++ b/arch/arm64/kernel/pci.c
@@ -61,21 +61,6 @@ int pcibios_add_device(struct pci_dev *dev)
 	return 0;
 }
 
-/*
- * raw_pci_read/write - Platform-specific PCI config space access.
- */
-int raw_pci_read(unsigned int domain, unsigned int bus,
-		  unsigned int devfn, int reg, int len, u32 *val)
-{
-	return -ENXIO;
-}
-
-int raw_pci_write(unsigned int domain, unsigned int bus,
-		unsigned int devfn, int reg, int len, u32 val)
-{
-	return -ENXIO;
-}
-
 #ifdef CONFIG_ACPI
 /* Root bridge scanning */
 struct pci_bus *pci_acpi_scan_root(struct acpi_pci_root *root)
-- 
1.9.1

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#1327065 — [PATCH V4 18/23] pci, of: Move the PCI I/O space management to PCI core code.

From	Tomasz Nowicki <tn@semihalf.com>
Date	2016-02-04 18:40 +0100
Subject	[PATCH V4 18/23] pci, of: Move the PCI I/O space management to PCI core code.
Message-ID	<qYw2V-57e-61@gated-at.bofh.it>
In reply to	#1327039

No functional changes in this patch.

PCI I/O space mapping code does not depend on OF, therefore it can be
moved to PCI core code. This way we will be able to use it
e.g. in ACPI PCI code.

Suggested-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Signed-off-by: Tomasz Nowicki <tn@semihalf.com>
CC: Arnd Bergmann <arnd@arndb.de>
CC: Liviu Dudau <Liviu.Dudau@arm.com>
CC: Lorenzo Pieralisi <Lorenzo.Pieralisi@arm.com>
---
 drivers/of/address.c       | 116 +--------------------------------------------
 drivers/pci/pci.c          | 115 ++++++++++++++++++++++++++++++++++++++++++++
 include/linux/of_address.h |   9 ----
 include/linux/pci.h        |   5 ++
 4 files changed, 121 insertions(+), 124 deletions(-)

diff --git a/drivers/of/address.c b/drivers/of/address.c
index 91a469d..0a553c0 100644
--- a/drivers/of/address.c
+++ b/drivers/of/address.c
@@ -4,6 +4,7 @@
 #include <linux/ioport.h>
 #include <linux/module.h>
 #include <linux/of_address.h>
+#include <linux/pci.h>
 #include <linux/pci_regs.h>
 #include <linux/sizes.h>
 #include <linux/slab.h>
@@ -673,121 +674,6 @@ const __be32 *of_get_address(struct device_node *dev, int index, u64 *size,
 }
 EXPORT_SYMBOL(of_get_address);
 
-#ifdef PCI_IOBASE
-struct io_range {
-	struct list_head list;
-	phys_addr_t start;
-	resource_size_t size;
-};
-
-static LIST_HEAD(io_range_list);
-static DEFINE_SPINLOCK(io_range_lock);
-#endif
-
-/*
- * Record the PCI IO range (expressed as CPU physical address + size).
- * Return a negative value if an error has occured, zero otherwise
- */
-int __weak pci_register_io_range(phys_addr_t addr, resource_size_t size)
-{
-	int err = 0;
-
-#ifdef PCI_IOBASE
-	struct io_range *range;
-	resource_size_t allocated_size = 0;
-
-	/* check if the range hasn't been previously recorded */
-	spin_lock(&io_range_lock);
-	list_for_each_entry(range, &io_range_list, list) {
-		if (addr >= range->start && addr + size <= range->start + size) {
-			/* range already registered, bail out */
-			goto end_register;
-		}
-		allocated_size += range->size;
-	}
-
-	/* range not registed yet, check for available space */
-	if (allocated_size + size - 1 > IO_SPACE_LIMIT) {
-		/* if it's too big check if 64K space can be reserved */
-		if (allocated_size + SZ_64K - 1 > IO_SPACE_LIMIT) {
-			err = -E2BIG;
-			goto end_register;
-		}
-
-		size = SZ_64K;
-		pr_warn("Requested IO range too big, new size set to 64K\n");
-	}
-
-	/* add the range to the list */
-	range = kzalloc(sizeof(*range), GFP_ATOMIC);
-	if (!range) {
-		err = -ENOMEM;
-		goto end_register;
-	}
-
-	range->start = addr;
-	range->size = size;
-
-	list_add_tail(&range->list, &io_range_list);
-
-end_register:
-	spin_unlock(&io_range_lock);
-#endif
-
-	return err;
-}
-
-phys_addr_t pci_pio_to_address(unsigned long pio)
-{
-	phys_addr_t address = (phys_addr_t)OF_BAD_ADDR;
-
-#ifdef PCI_IOBASE
-	struct io_range *range;
-	resource_size_t allocated_size = 0;
-
-	if (pio > IO_SPACE_LIMIT)
-		return address;
-
-	spin_lock(&io_range_lock);
-	list_for_each_entry(range, &io_range_list, list) {
-		if (pio >= allocated_size && pio < allocated_size + range->size) {
-			address = range->start + pio - allocated_size;
-			break;
-		}
-		allocated_size += range->size;
-	}
-	spin_unlock(&io_range_lock);
-#endif
-
-	return address;
-}
-
-unsigned long __weak pci_address_to_pio(phys_addr_t address)
-{
-#ifdef PCI_IOBASE
-	struct io_range *res;
-	resource_size_t offset = 0;
-	unsigned long addr = -1;
-
-	spin_lock(&io_range_lock);
-	list_for_each_entry(res, &io_range_list, list) {
-		if (address >= res->start && address < res->start + res->size) {
-			addr = address - res->start + offset;
-			break;
-		}
-		offset += res->size;
-	}
-	spin_unlock(&io_range_lock);
-
-	return addr;
-#else
-	if (address > IO_SPACE_LIMIT)
-		return (unsigned long)-1;
-
-	return (unsigned long) address;
-#endif
-}
-
 static int __of_address_to_resource(struct device_node *dev,
 		const __be32 *addrp, u64 size, unsigned int flags,
 		const char *name, struct resource *r)
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index d6c768e..3a516c0 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -3023,6 +3023,121 @@ int pci_request_regions_exclusive(struct pci_dev *pdev, const char *res_name)
 }
 EXPORT_SYMBOL(pci_request_regions_exclusive);
 
+#ifdef PCI_IOBASE
+struct io_range {
+	struct list_head list;
+	phys_addr_t start;
+	resource_size_t size;
+};
+
+static LIST_HEAD(io_range_list);
+static DEFINE_SPINLOCK(io_range_lock);
+#endif
+
+/*
+ * Record the PCI IO range (expressed as CPU physical address + size).
+ * Return a negative value if an error has occured, zero otherwise
+ */
+int __weak pci_register_io_range(phys_addr_t addr, resource_size_t size)
+{
+	int err = 0;
+
+#ifdef PCI_IOBASE
+	struct io_range *range;
+	resource_size_t allocated_size = 0;
+
+	/* check if the range hasn't been previously recorded */
+	spin_lock(&io_range_lock);
+	list_for_each_entry(range, &io_range_list, list) {
+		if (addr >= range->start && addr + size <= range->start + size) {
+			/* range already registered, bail out */
+			goto end_register;
+		}
+		allocated_size += range->size;
+	}
+
+	/* range not registed yet, check for available space */
+	if (allocated_size + size - 1 > IO_SPACE_LIMIT) {
+		/* if it's too big check if 64K space can be reserved */
+		if (allocated_size + SZ_64K - 1 > IO_SPACE_LIMIT) {
+			err = -E2BIG;
+			goto end_register;
+		}
+
+		size = SZ_64K;
+		pr_warn("Requested IO range too big, new size set to 64K\n");
+	}
+
+	/* add the range to the list */
+	range = kzalloc(sizeof(*range), GFP_ATOMIC);
+	if (!range) {
+		err = -ENOMEM;
+		goto end_register;
+	}
+
+	range->start = addr;
+	range->size = size;
+
+	list_add_tail(&range->list, &io_range_list);
+
+end_register:
+	spin_unlock(&io_range_lock);
+#endif
+
+	return err;
+}
+
+phys_addr_t pci_pio_to_address(unsigned long pio)
+{
+	phys_addr_t address = (phys_addr_t)OF_BAD_ADDR;
+
+#ifdef PCI_IOBASE
+	struct io_range *range;
+	resource_size_t allocated_size = 0;
+
+	if (pio > IO_SPACE_LIMIT)
+		return address;
+
+	spin_lock(&io_range_lock);
+	list_for_each_entry(range, &io_range_list, list) {
+		if (pio >= allocated_size && pio < allocated_size + range->size) {
+			address = range->start + pio - allocated_size;
+			break;
+		}
+		allocated_size += range->size;
+	}
+	spin_unlock(&io_range_lock);
+#endif
+
+	return address;
+}
+
+unsigned long __weak pci_address_to_pio(phys_addr_t address)
+{
+#ifdef PCI_IOBASE
+	struct io_range *res;
+	resource_size_t offset = 0;
+	unsigned long addr = -1;
+
+	spin_lock(&io_range_lock);
+	list_for_each_entry(res, &io_range_list, list) {
+		if (address >= res->start && address < res->start + res->size) {
+			addr = address - res->start + offset;
+			break;
+		}
+		offset += res->size;
+	}
+	spin_unlock(&io_range_lock);
+
+	return addr;
+#else
+	if (address > IO_SPACE_LIMIT)
+		return (unsigned long)-1;
+
+	return (unsigned long) address;
+#endif
+}
+
 /**
  *	pci_remap_iospace - Remap the memory mapped I/O space
  *	@res: Resource describing the I/O space
diff --git a/include/linux/of_address.h b/include/linux/of_address.h
index 01c0a55..3786473 100644
--- a/include/linux/of_address.h
+++ b/include/linux/of_address.h
@@ -47,10 +47,6 @@ void __iomem *of_io_request_and_map(struct device_node *device,
 extern const __be32 *of_get_address(struct device_node *dev, int index,
 			   u64 *size, unsigned int *flags);
 
-extern int pci_register_io_range(phys_addr_t addr, resource_size_t size);
-extern unsigned long pci_address_to_pio(phys_addr_t addr);
-extern phys_addr_t pci_pio_to_address(unsigned long pio);
-
 extern int of_pci_range_parser_init(struct of_pci_range_parser *parser,
 			struct device_node *node);
 extern struct of_pci_range *of_pci_range_parser_one(
@@ -86,11 +82,6 @@ static inline const __be32 *of_get_address(struct device_node *dev, int index,
 	return NULL;
 }
 
-static inline phys_addr_t pci_pio_to_address(unsigned long pio)
-{
-	return 0;
-}
-
 static inline int of_pci_range_parser_init(struct of_pci_range_parser *parser,
 			struct device_node *node)
 {
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 27df4a6..dac677c 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -1168,6 +1168,9 @@ int __must_check pci_bus_alloc_resource(struct pci_bus *bus,
 			void *alignf_data);
 
 
+int pci_register_io_range(phys_addr_t addr, resource_size_t size);
+unsigned long pci_address_to_pio(phys_addr_t addr);
+phys_addr_t pci_pio_to_address(unsigned long pio);
 int pci_remap_iospace(const struct resource *res, phys_addr_t phys_addr);
 
 static inline pci_bus_addr_t pci_bus_address(struct pci_dev *pdev, int bar)
@@ -1488,6 +1491,8 @@ static inline int pci_request_regions(struct pci_dev *dev, const char *res_name)
 { return -EIO; }
 static inline void pci_release_regions(struct pci_dev *dev) { }
 
+static inline unsigned long pci_address_to_pio(phys_addr_t addr) { return -1; }
+
 static inline void pci_block_cfg_access(struct pci_dev *dev) { }
 static inline int pci_block_cfg_access_in_atomic(struct pci_dev *dev)
 { return 0; }
-- 
1.9.1

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csiph-web

[PATCH V4 00/23] MMCONFIG refactoring and support for ARM64 PCI hostbridge init based on ACPI

Contents

#1327039 — [PATCH V4 00/23] MMCONFIG refactoring and support for ARM64 PCI hostbridge init based on ACPI

#1327040 — [PATCH V4 12/23] x86, ia64, pci: Remove ACPI companion device from platform specific data.

#1327042 — [PATCH V4 02/23] x86, pci, acpi: Move arch-agnostic MMCONFIG (aka ECAM) and ACPI code out of arch/x86/ directory

#1327044 — [PATCH V4 20/23] pci, acpi: Support for ACPI based generic PCI host controller init

#1327046 — [PATCH V4 04/23] x86, pci: mmconfig_{32,64}.c code refactoring - remove code duplication.

#1327047 — [PATCH V4 13/23] pci, acpi: Provide generic way to assign bus domain number.

#1327048 — [PATCH V4 06/23] XEN / PCI: Remove the dependence on arch x86 when PCI_MMCONFIG=y

#1327049 — [PATCH V4 10/23] x86, pci: Cleanup platform specific MCFG data by using ECAM hot_added flag.

#1327050 — [PATCH V4 07/23] pci, acpi, mcfg: Provide default RAW ACPI PCI config space accessors.

#1327051 — [PATCH V4 16/23] x86, acpi, pci: Use equivalent function from mcfg.c driver.

#1327052 — [PATCH V4 21/23] pci, acpi: Match PCI config space accessors against platfrom specific quirks.

#1327053 — [PATCH V4 03/23] pci, acpi, mcfg: Provide generic implementation of MCFG code initialization.

#1327054 — [PATCH V4 09/23] pci, acpi, ecam: Add flag to indicate whether ECAM region was hot added or not.

#1327057 — [PATCH V4 23/23] arm64, pci, acpi: Start using ACPI based PCI host bridge driver for ARM64.

#1327058 — [PATCH V4 22/23] arm64, pci, acpi: Assign legacy IRQs once device is enable.

#1327059 — [PATCH V4 01/23] x86, pci: Reorder logic of pci_mmconfig_insert() function

#1327061 — [PATCH V4 11/23] pci, acpi: Move ACPI host bridge device companion assignment to core code.

#1327063 — [PATCH V4 15/23] acpi, mcfg: Implement two calls that might be used to inject/remove MCFG region.

#1327064 — [PATCH V4 08/23] arm64, acpi: Use MCFG and empty PCI config space accessors from mcfg.c file.

#1327065 — [PATCH V4 18/23] pci, of: Move the PCI I/O space management to PCI core code.