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Groups > linux.kernel > #1163569
| From | Dan Williams <dan.j.williams@intel.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [PATCH v6 01/21] e820, efi: add ACPI 6.0 persistent memory types |
| Date | 2015-06-11 22:20 +0200 |
| Message-ID | <pAh7d-86n-27@gated-at.bofh.it> (permalink) |
| References | <pAh7c-86n-3@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
ACPI 6.0 formalizes e820-type-7 and efi-type-14 as persistent memory.
Mark it "reserved" and allow it to be claimed by a persistent memory
device driver.
This definition is in addition to the Linux kernel's existing type-12
definition that was recently added in support of shipping platforms with
NVDIMM support that predate ACPI 6.0 (which now classifies type-12 as
OEM reserved).
Note, /proc/iomem can be consulted for differentiating legacy
"Persistent Memory (legacy)" E820_PRAM vs standard "Persistent Memory"
E820_PMEM.
Cc: Boaz Harrosh <boaz@plexistor.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Jens Axboe <axboe@fb.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Matthew Wilcox <willy@linux.intel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Jeff Moyer <jmoyer@redhat.com>
Acked-by: Andy Lutomirski <luto@amacapital.net>
Reviewed-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
arch/arm64/kernel/efi.c | 1 +
arch/ia64/kernel/efi.c | 4 ++++
arch/x86/boot/compressed/eboot.c | 4 ++++
arch/x86/include/uapi/asm/e820.h | 1 +
arch/x86/kernel/e820.c | 28 ++++++++++++++++++++++++----
arch/x86/platform/efi/efi.c | 3 +++
include/linux/efi.h | 3 ++-
7 files changed, 39 insertions(+), 5 deletions(-)
diff --git a/arch/arm64/kernel/efi.c b/arch/arm64/kernel/efi.c
index ab21e0d58278..9d4aa18f2a82 100644
--- a/arch/arm64/kernel/efi.c
+++ b/arch/arm64/kernel/efi.c
@@ -158,6 +158,7 @@ static __init int is_reserve_region(efi_memory_desc_t *md)
case EFI_BOOT_SERVICES_CODE:
case EFI_BOOT_SERVICES_DATA:
case EFI_CONVENTIONAL_MEMORY:
+ case EFI_PERSISTENT_MEMORY:
return 0;
default:
break;
diff --git a/arch/ia64/kernel/efi.c b/arch/ia64/kernel/efi.c
index c52d7540dc05..5f6be9dd6968 100644
--- a/arch/ia64/kernel/efi.c
+++ b/arch/ia64/kernel/efi.c
@@ -1223,6 +1223,10 @@ efi_initialize_iomem_resources(struct resource *code_resource,
flags |= IORESOURCE_DISABLED;
break;
+ case EFI_PERSISTENT_MEMORY:
+ name = "Persistent Memory";
+ break;
+
case EFI_RESERVED_TYPE:
case EFI_RUNTIME_SERVICES_CODE:
case EFI_RUNTIME_SERVICES_DATA:
diff --git a/arch/x86/boot/compressed/eboot.c b/arch/x86/boot/compressed/eboot.c
index 48304b89b601..2c82bd150d43 100644
--- a/arch/x86/boot/compressed/eboot.c
+++ b/arch/x86/boot/compressed/eboot.c
@@ -1224,6 +1224,10 @@ static efi_status_t setup_e820(struct boot_params *params,
e820_type = E820_NVS;
break;
+ case EFI_PERSISTENT_MEMORY:
+ e820_type = E820_PMEM;
+ break;
+
default:
continue;
}
diff --git a/arch/x86/include/uapi/asm/e820.h b/arch/x86/include/uapi/asm/e820.h
index 960a8a9dc4ab..0f457e6eab18 100644
--- a/arch/x86/include/uapi/asm/e820.h
+++ b/arch/x86/include/uapi/asm/e820.h
@@ -32,6 +32,7 @@
#define E820_ACPI 3
#define E820_NVS 4
#define E820_UNUSABLE 5
+#define E820_PMEM 7
/*
* This is a non-standardized way to represent ADR or NVDIMM regions that
diff --git a/arch/x86/kernel/e820.c b/arch/x86/kernel/e820.c
index e2ce85db2283..c857d53269dd 100644
--- a/arch/x86/kernel/e820.c
+++ b/arch/x86/kernel/e820.c
@@ -149,6 +149,7 @@ static void __init e820_print_type(u32 type)
case E820_UNUSABLE:
printk(KERN_CONT "unusable");
break;
+ case E820_PMEM:
case E820_PRAM:
printk(KERN_CONT "persistent (type %u)", type);
break;
@@ -918,11 +919,32 @@ static inline const char *e820_type_to_string(int e820_type)
case E820_ACPI: return "ACPI Tables";
case E820_NVS: return "ACPI Non-volatile Storage";
case E820_UNUSABLE: return "Unusable memory";
- case E820_PRAM: return "Persistent RAM";
+ case E820_PRAM: return "Persistent Memory (legacy)";
+ case E820_PMEM: return "Persistent Memory";
default: return "reserved";
}
}
+static bool do_mark_busy(u32 type, struct resource *res)
+{
+ /* this is the legacy bios/dos rom-shadow + mmio region */
+ if (res->start < (1ULL<<20))
+ return true;
+
+ /*
+ * Treat persistent memory like device memory, i.e. reserve it
+ * for exclusive use of a driver
+ */
+ switch (type) {
+ case E820_RESERVED:
+ case E820_PRAM:
+ case E820_PMEM:
+ return false;
+ default:
+ return true;
+ }
+}
+
/*
* Mark e820 reserved areas as busy for the resource manager.
*/
@@ -952,9 +974,7 @@ void __init e820_reserve_resources(void)
* pci device BAR resource and insert them later in
* pcibios_resource_survey()
*/
- if (((e820.map[i].type != E820_RESERVED) &&
- (e820.map[i].type != E820_PRAM)) ||
- res->start < (1ULL<<20)) {
+ if (do_mark_busy(e820.map[i].type, res)) {
res->flags |= IORESOURCE_BUSY;
insert_resource(&iomem_resource, res);
}
diff --git a/arch/x86/platform/efi/efi.c b/arch/x86/platform/efi/efi.c
index 02744df576d5..fe01ae37a2a4 100644
--- a/arch/x86/platform/efi/efi.c
+++ b/arch/x86/platform/efi/efi.c
@@ -153,6 +153,9 @@ static void __init do_add_efi_memmap(void)
case EFI_UNUSABLE_MEMORY:
e820_type = E820_UNUSABLE;
break;
+ case EFI_PERSISTENT_MEMORY:
+ e820_type = E820_PMEM;
+ break;
default:
/*
* EFI_RESERVED_TYPE EFI_RUNTIME_SERVICES_CODE
diff --git a/include/linux/efi.h b/include/linux/efi.h
index af5be0368dec..825b6e3d69cb 100644
--- a/include/linux/efi.h
+++ b/include/linux/efi.h
@@ -85,7 +85,8 @@ typedef struct {
#define EFI_MEMORY_MAPPED_IO 11
#define EFI_MEMORY_MAPPED_IO_PORT_SPACE 12
#define EFI_PAL_CODE 13
-#define EFI_MAX_MEMORY_TYPE 14
+#define EFI_PERSISTENT_MEMORY 14
+#define EFI_MAX_MEMORY_TYPE 15
/* Attribute values: */
#define EFI_MEMORY_UC ((u64)0x0000000000000001ULL) /* uncached */
--
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[PATCH v6 00/21] libnvdimm: non-volatile memory devices Dan Williams <dan.j.williams@intel.com> - 2015-06-11 22:20 +0200
[PATCH v6 01/21] e820, efi: add ACPI 6.0 persistent memory types Dan Williams <dan.j.williams@intel.com> - 2015-06-11 22:20 +0200
[PATCH v6 11/21] libnvdimm, nfit: add interleave-set state-tracking infrastructure Dan Williams <dan.j.williams@intel.com> - 2015-06-11 22:20 +0200
Re: [PATCH v6 11/21] libnvdimm, nfit: add interleave-set state-tracking infrastructure "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2015-06-17 23:50 +0200
[PATCH v6 04/21] libnvdimm, nfit: dimm/memory-devices Dan Williams <dan.j.williams@intel.com> - 2015-06-11 22:20 +0200
Re: [PATCH v6 04/21] libnvdimm, nfit: dimm/memory-devices "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2015-06-17 23:40 +0200
[PATCH v6 06/21] libnvdimm, nvdimm: dimm driver and base libnvdimm device-driver infrastructure Dan Williams <dan.j.williams@intel.com> - 2015-06-11 22:20 +0200
[PATCH v6 12/21] libnvdimm: namespace indices: read and validate Dan Williams <dan.j.williams@intel.com> - 2015-06-11 22:20 +0200
[PATCH v6 15/21] libnvdimm: write pmem label set Dan Williams <dan.j.williams@intel.com> - 2015-06-11 22:20 +0200
[PATCH v6 09/21] libnvdimm, pmem: move pmem to drivers/nvdimm/ Dan Williams <dan.j.williams@intel.com> - 2015-06-11 22:20 +0200
[PATCH v6 03/21] libnvdimm: control character device and nvdimm_bus sysfs attributes Dan Williams <dan.j.williams@intel.com> - 2015-06-11 22:20 +0200
Re: [PATCH v6 03/21] libnvdimm: control character device and nvdimm_bus sysfs attributes "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2015-06-17 23:40 +0200
Re: [PATCH v6 18/21] nd_btt: atomic sector updates Dan Williams <dan.j.williams@intel.com> - 2015-06-11 22:30 +0200
Re: [PATCH v6 19/21] libnvdimm, nfit, nd_blk: driver for BLK-mode access persistent memory "Rafael J. Wysocki" <rjw@rjwysocki.net> - 2015-06-17 23:50 +0200
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