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[PATCH 0/6] PCI: generic: Misc. bug fixes and enhanced support for MSI.

Started byDavid Daney <ddaney.cavm@gmail.com>
First post2015-09-12 01:30 +0200
Last post2015-09-15 19:50 +0200
Articles 5 — 2 participants

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  [PATCH 0/6] PCI: generic: Misc. bug fixes and enhanced support for MSI. David Daney <ddaney.cavm@gmail.com> - 2015-09-12 01:30 +0200
    [PATCH 6/6] PCI: generic: Allow bus default MSI controller to be specified. David Daney <ddaney.cavm@gmail.com> - 2015-09-12 01:30 +0200
      Re: [PATCH 6/6] PCI: generic: Allow bus default MSI controller to be  specified. Will Deacon <will.deacon@arm.com> - 2015-09-15 20:00 +0200
    [PATCH 3/6] PCI: generic: Quit clobbering our pci_ops. David Daney <ddaney.cavm@gmail.com> - 2015-09-12 01:30 +0200
      Re: [PATCH 3/6] PCI: generic: Quit clobbering our pci_ops. Will Deacon <will.deacon@arm.com> - 2015-09-15 19:50 +0200

#1223261 — [PATCH 0/6] PCI: generic: Misc. bug fixes and enhanced support for MSI.

FromDavid Daney <ddaney.cavm@gmail.com>
Date2015-09-12 01:30 +0200
Subject[PATCH 0/6] PCI: generic: Misc. bug fixes and enhanced support for MSI.
Message-ID<q7FVw-85A-3@gated-at.bofh.it>
From: David Daney <david.daney@cavium.com>

While using the pci-host-generic driver to add PCI support for the
Cavium ThunderX processors, several bugs were discovered.  We also
need the ability to specify a per-bus MSI controller, so support for
that was added.

David Daney (6):
  PCI: Make global and export pdev_fixup_irq().
  PCI: generic: Only fixup irqs for bus we are creating.
  PCI: generic: Quit clobbering our pci_ops.
  PCI: generic: Correct, and avoid overflow, in bus_max calculation.
  PCI: generic: Pass proper starting bus number to pci_scan_root_bus().
  PCI: generic: Allow bus default MSI controller to be specified.

 .../devicetree/bindings/pci/host-generic-pci.txt   |  5 ++
 drivers/pci/host/pci-host-generic.c                | 55 +++++++++++++++-------
 drivers/pci/setup-irq.c                            |  7 +--
 include/linux/pci.h                                |  3 ++
 4 files changed, 50 insertions(+), 20 deletions(-)

-- 
1.7.11.7

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#1223262 — [PATCH 6/6] PCI: generic: Allow bus default MSI controller to be specified.

FromDavid Daney <ddaney.cavm@gmail.com>
Date2015-09-12 01:30 +0200
Subject[PATCH 6/6] PCI: generic: Allow bus default MSI controller to be specified.
Message-ID<q7FVx-85A-21@gated-at.bofh.it>
In reply to#1223261
From: David Daney <david.daney@cavium.com>

If the device tree node for the bus has a "msi-parent" property, use
that as the default MSI controller for devices on the bus.  Add device
tree binding documentation describing the new property.

This allows the pci-host-generic driver to be used in systems with
multiple MSI controllers.

Signed-off-by: David Daney <david.daney@cavium.com>
---
 .../devicetree/bindings/pci/host-generic-pci.txt          |  5 +++++
 drivers/pci/host/pci-host-generic.c                       | 15 +++++++++++++--
 2 files changed, 18 insertions(+), 2 deletions(-)

diff --git a/Documentation/devicetree/bindings/pci/host-generic-pci.txt b/Documentation/devicetree/bindings/pci/host-generic-pci.txt
index cf3e205..daa6942 100644
--- a/Documentation/devicetree/bindings/pci/host-generic-pci.txt
+++ b/Documentation/devicetree/bindings/pci/host-generic-pci.txt
@@ -29,6 +29,11 @@ Properties of the host controller node:
                    to indicate the range of bus numbers for this controller.
                    If absent, defaults to <0 255> (i.e. all buses).
 
+- msi-parent     : Optional property to indicate the MSI controller associated
+                   with devices on the bus.  If not present, the default MSI
+                   controller is used.  This property is further discussed in
+                   interrupt-controller/msi.txt
+
 - #address-cells : Must be 3.
 
 - #size-cells    : Must be 2.
diff --git a/drivers/pci/host/pci-host-generic.c b/drivers/pci/host/pci-host-generic.c
index 8219c0b..e0248b4 100644
--- a/drivers/pci/host/pci-host-generic.c
+++ b/drivers/pci/host/pci-host-generic.c
@@ -225,6 +225,7 @@ static int gen_pci_probe(struct platform_device *pdev)
 	struct device_node *np = dev->of_node;
 	struct gen_pci *pci = devm_kzalloc(dev, sizeof(*pci), GFP_KERNEL);
 	struct pci_bus *bus, *child;
+	struct msi_controller *msi;
 
 	if (!pci)
 		return -ENOMEM;
@@ -265,8 +266,18 @@ static int gen_pci_probe(struct platform_device *pdev)
 	if (!pci_has_flag(PCI_PROBE_ONLY))
 		pci_add_flags(PCI_REASSIGN_ALL_RSRC | PCI_REASSIGN_ALL_BUS);
 
-	bus = pci_scan_root_bus(dev, pci->cfg.bus_range->start,
-				&pci->cfg.ops.ops, pci, &pci->resources);
+	msi = NULL;
+	if (IS_ENABLED(CONFIG_PCI_MSI)) {
+		struct device_node *msi_node;
+
+		msi_node = of_parse_phandle(np, "msi-parent", 0);
+		if (msi_node)
+			msi = of_pci_find_msi_chip_by_node(msi_node);
+	}
+
+	bus = pci_scan_root_bus_msi(dev, pci->cfg.bus_range->start,
+				    &pci->cfg.ops.ops, pci, &pci->resources,
+				    msi);
 	if (!bus) {
 		dev_err(dev, "Scanning rootbus failed");
 		return -ENODEV;
-- 
1.7.11.7

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#1225477 — Re: [PATCH 6/6] PCI: generic: Allow bus default MSI controller to be specified.

FromWill Deacon <will.deacon@arm.com>
Date2015-09-15 20:00 +0200
SubjectRe: [PATCH 6/6] PCI: generic: Allow bus default MSI controller to be specified.
Message-ID<q92Gn-3AZ-25@gated-at.bofh.it>
In reply to#1223262
On Sat, Sep 12, 2015 at 12:21:59AM +0100, David Daney wrote:
> From: David Daney <david.daney@cavium.com>
> 
> If the device tree node for the bus has a "msi-parent" property, use
> that as the default MSI controller for devices on the bus.  Add device
> tree binding documentation describing the new property.
> 
> This allows the pci-host-generic driver to be used in systems with
> multiple MSI controllers.
> 
> Signed-off-by: David Daney <david.daney@cavium.com>
> ---
>  .../devicetree/bindings/pci/host-generic-pci.txt          |  5 +++++
>  drivers/pci/host/pci-host-generic.c                       | 15 +++++++++++++--
>  2 files changed, 18 insertions(+), 2 deletions(-)

I don't think you need this anymore with 4.3-rc1. The core IRQ subsystem
should take care of parsing and configuring the MSI parents.

Will
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#1223263 — [PATCH 3/6] PCI: generic: Quit clobbering our pci_ops.

FromDavid Daney <ddaney.cavm@gmail.com>
Date2015-09-12 01:30 +0200
Subject[PATCH 3/6] PCI: generic: Quit clobbering our pci_ops.
Message-ID<q7FVx-85A-19@gated-at.bofh.it>
In reply to#1223261
From: David Daney <david.daney@cavium.com>

The pci-host-generic driver keeps a global struct pci_ops which it
then patches with the .map_bus method appropriate for the bus device.
A problem arises when the driver is used for two different types of
bus devices, the .map_bus method for the last device probed clobbers
the method for all previous devices.  The result, only the last bus
device probed has the proper .map_bus, and the others fail.

Move the struct pci_ops into the bus specific structure, and
initialize it when the bus device is probed.  Keep a copy of the
gen_pci_cfg_bus_ops structure, instead of a pointer to a global copy,
to future proof against the addition of bus specific elements to
struct pci_ops.

Signed-off-by: David Daney <david.daney@cavium.com>
---
 drivers/pci/host/pci-host-generic.c | 31 +++++++++++++++++--------------
 1 file changed, 17 insertions(+), 14 deletions(-)

diff --git a/drivers/pci/host/pci-host-generic.c b/drivers/pci/host/pci-host-generic.c
index a0fb241..cd6f898 100644
--- a/drivers/pci/host/pci-host-generic.c
+++ b/drivers/pci/host/pci-host-generic.c
@@ -27,7 +27,7 @@
 
 struct gen_pci_cfg_bus_ops {
 	u32 bus_shift;
-	void __iomem *(*map_bus)(struct pci_bus *, unsigned int, int);
+	struct pci_ops ops;
 };
 
 struct gen_pci_cfg_windows {
@@ -35,7 +35,7 @@ struct gen_pci_cfg_windows {
 	struct resource				*bus_range;
 	void __iomem				**win;
 
-	const struct gen_pci_cfg_bus_ops	*ops;
+	struct gen_pci_cfg_bus_ops		ops;
 };
 
 /*
@@ -65,7 +65,11 @@ static void __iomem *gen_pci_map_cfg_bus_cam(struct pci_bus *bus,
 
 static struct gen_pci_cfg_bus_ops gen_pci_cfg_cam_bus_ops = {
 	.bus_shift	= 16,
-	.map_bus	= gen_pci_map_cfg_bus_cam,
+	.ops		= {
+		.map_bus	= gen_pci_map_cfg_bus_cam,
+		.read		= pci_generic_config_read,
+		.write		= pci_generic_config_write,
+	}
 };
 
 static void __iomem *gen_pci_map_cfg_bus_ecam(struct pci_bus *bus,
@@ -80,12 +84,11 @@ static void __iomem *gen_pci_map_cfg_bus_ecam(struct pci_bus *bus,
 
 static struct gen_pci_cfg_bus_ops gen_pci_cfg_ecam_bus_ops = {
 	.bus_shift	= 20,
-	.map_bus	= gen_pci_map_cfg_bus_ecam,
-};
-
-static struct pci_ops gen_pci_ops = {
-	.read	= pci_generic_config_read,
-	.write	= pci_generic_config_write,
+	.ops		= {
+		.map_bus	= gen_pci_map_cfg_bus_ecam,
+		.read		= pci_generic_config_read,
+		.write		= pci_generic_config_write,
+	}
 };
 
 static const struct of_device_id gen_pci_of_match[] = {
@@ -175,7 +178,7 @@ static int gen_pci_parse_map_cfg_windows(struct gen_pci *pci)
 
 	/* Limit the bus-range to fit within reg */
 	bus_max = pci->cfg.bus_range->start +
-		  (resource_size(&pci->cfg.res) >> pci->cfg.ops->bus_shift) - 1;
+		  (resource_size(&pci->cfg.res) >> pci->cfg.ops.bus_shift) - 1;
 	pci->cfg.bus_range->end = min_t(resource_size_t,
 					pci->cfg.bus_range->end, bus_max);
 
@@ -193,7 +196,7 @@ static int gen_pci_parse_map_cfg_windows(struct gen_pci *pci)
 	bus_range = pci->cfg.bus_range;
 	for (busn = bus_range->start; busn <= bus_range->end; ++busn) {
 		u32 idx = busn - bus_range->start;
-		u32 sz = 1 << pci->cfg.ops->bus_shift;
+		u32 sz = 1 << pci->cfg.ops.bus_shift;
 
 		pci->cfg.win[idx] = devm_ioremap(dev,
 						 pci->cfg.res.start + busn * sz,
@@ -240,8 +243,7 @@ static int gen_pci_probe(struct platform_device *pdev)
 	}
 
 	of_id = of_match_node(gen_pci_of_match, np);
-	pci->cfg.ops = of_id->data;
-	gen_pci_ops.map_bus = pci->cfg.ops->map_bus;
+	pci->cfg.ops = *(struct gen_pci_cfg_bus_ops *)of_id->data;
 	pci->host.dev.parent = dev;
 	INIT_LIST_HEAD(&pci->host.windows);
 	INIT_LIST_HEAD(&pci->resources);
@@ -262,7 +264,8 @@ static int gen_pci_probe(struct platform_device *pdev)
 	if (!pci_has_flag(PCI_PROBE_ONLY))
 		pci_add_flags(PCI_REASSIGN_ALL_RSRC | PCI_REASSIGN_ALL_BUS);
 
-	bus = pci_scan_root_bus(dev, 0, &gen_pci_ops, pci, &pci->resources);
+	bus = pci_scan_root_bus(dev, 0,
+				&pci->cfg.ops.ops, pci, &pci->resources);
 	if (!bus) {
 		dev_err(dev, "Scanning rootbus failed");
 		return -ENODEV;
-- 
1.7.11.7

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#1225468 — Re: [PATCH 3/6] PCI: generic: Quit clobbering our pci_ops.

FromWill Deacon <will.deacon@arm.com>
Date2015-09-15 19:50 +0200
SubjectRe: [PATCH 3/6] PCI: generic: Quit clobbering our pci_ops.
Message-ID<q92wG-3pz-9@gated-at.bofh.it>
In reply to#1223263
On Sat, Sep 12, 2015 at 12:21:56AM +0100, David Daney wrote:
> From: David Daney <david.daney@cavium.com>
> 
> The pci-host-generic driver keeps a global struct pci_ops which it
> then patches with the .map_bus method appropriate for the bus device.
> A problem arises when the driver is used for two different types of
> bus devices, the .map_bus method for the last device probed clobbers
> the method for all previous devices.  The result, only the last bus
> device probed has the proper .map_bus, and the others fail.
> 
> Move the struct pci_ops into the bus specific structure, and
> initialize it when the bus device is probed.  Keep a copy of the
> gen_pci_cfg_bus_ops structure, instead of a pointer to a global copy,
> to future proof against the addition of bus specific elements to
> struct pci_ops.

This looks ok to me:

  Acked-by: Will Deacon <will.deacon@arm.com>

Will

> Signed-off-by: David Daney <david.daney@cavium.com>
> ---
>  drivers/pci/host/pci-host-generic.c | 31 +++++++++++++++++--------------
>  1 file changed, 17 insertions(+), 14 deletions(-)
> 
> diff --git a/drivers/pci/host/pci-host-generic.c b/drivers/pci/host/pci-host-generic.c
> index a0fb241..cd6f898 100644
> --- a/drivers/pci/host/pci-host-generic.c
> +++ b/drivers/pci/host/pci-host-generic.c
> @@ -27,7 +27,7 @@
>  
>  struct gen_pci_cfg_bus_ops {
>  	u32 bus_shift;
> -	void __iomem *(*map_bus)(struct pci_bus *, unsigned int, int);
> +	struct pci_ops ops;
>  };
>  
>  struct gen_pci_cfg_windows {
> @@ -35,7 +35,7 @@ struct gen_pci_cfg_windows {
>  	struct resource				*bus_range;
>  	void __iomem				**win;
>  
> -	const struct gen_pci_cfg_bus_ops	*ops;
> +	struct gen_pci_cfg_bus_ops		ops;
>  };
>  
>  /*
> @@ -65,7 +65,11 @@ static void __iomem *gen_pci_map_cfg_bus_cam(struct pci_bus *bus,
>  
>  static struct gen_pci_cfg_bus_ops gen_pci_cfg_cam_bus_ops = {
>  	.bus_shift	= 16,
> -	.map_bus	= gen_pci_map_cfg_bus_cam,
> +	.ops		= {
> +		.map_bus	= gen_pci_map_cfg_bus_cam,
> +		.read		= pci_generic_config_read,
> +		.write		= pci_generic_config_write,
> +	}
>  };
>  
>  static void __iomem *gen_pci_map_cfg_bus_ecam(struct pci_bus *bus,
> @@ -80,12 +84,11 @@ static void __iomem *gen_pci_map_cfg_bus_ecam(struct pci_bus *bus,
>  
>  static struct gen_pci_cfg_bus_ops gen_pci_cfg_ecam_bus_ops = {
>  	.bus_shift	= 20,
> -	.map_bus	= gen_pci_map_cfg_bus_ecam,
> -};
> -
> -static struct pci_ops gen_pci_ops = {
> -	.read	= pci_generic_config_read,
> -	.write	= pci_generic_config_write,
> +	.ops		= {
> +		.map_bus	= gen_pci_map_cfg_bus_ecam,
> +		.read		= pci_generic_config_read,
> +		.write		= pci_generic_config_write,
> +	}
>  };
>  
>  static const struct of_device_id gen_pci_of_match[] = {
> @@ -175,7 +178,7 @@ static int gen_pci_parse_map_cfg_windows(struct gen_pci *pci)
>  
>  	/* Limit the bus-range to fit within reg */
>  	bus_max = pci->cfg.bus_range->start +
> -		  (resource_size(&pci->cfg.res) >> pci->cfg.ops->bus_shift) - 1;
> +		  (resource_size(&pci->cfg.res) >> pci->cfg.ops.bus_shift) - 1;
>  	pci->cfg.bus_range->end = min_t(resource_size_t,
>  					pci->cfg.bus_range->end, bus_max);
>  
> @@ -193,7 +196,7 @@ static int gen_pci_parse_map_cfg_windows(struct gen_pci *pci)
>  	bus_range = pci->cfg.bus_range;
>  	for (busn = bus_range->start; busn <= bus_range->end; ++busn) {
>  		u32 idx = busn - bus_range->start;
> -		u32 sz = 1 << pci->cfg.ops->bus_shift;
> +		u32 sz = 1 << pci->cfg.ops.bus_shift;
>  
>  		pci->cfg.win[idx] = devm_ioremap(dev,
>  						 pci->cfg.res.start + busn * sz,
> @@ -240,8 +243,7 @@ static int gen_pci_probe(struct platform_device *pdev)
>  	}
>  
>  	of_id = of_match_node(gen_pci_of_match, np);
> -	pci->cfg.ops = of_id->data;
> -	gen_pci_ops.map_bus = pci->cfg.ops->map_bus;
> +	pci->cfg.ops = *(struct gen_pci_cfg_bus_ops *)of_id->data;
>  	pci->host.dev.parent = dev;
>  	INIT_LIST_HEAD(&pci->host.windows);
>  	INIT_LIST_HEAD(&pci->resources);
> @@ -262,7 +264,8 @@ static int gen_pci_probe(struct platform_device *pdev)
>  	if (!pci_has_flag(PCI_PROBE_ONLY))
>  		pci_add_flags(PCI_REASSIGN_ALL_RSRC | PCI_REASSIGN_ALL_BUS);
>  
> -	bus = pci_scan_root_bus(dev, 0, &gen_pci_ops, pci, &pci->resources);
> +	bus = pci_scan_root_bus(dev, 0,
> +				&pci->cfg.ops.ops, pci, &pci->resources);
>  	if (!bus) {
>  		dev_err(dev, "Scanning rootbus failed");
>  		return -ENODEV;
> -- 
> 1.7.11.7
> 
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