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nfit: update block I/O path to use PMEM API

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Update the nfit block I/O path to use the new PMEM API and to adhere to
the read/write flows outlined in the "NVDIMM Block Window Driver
Writer's Guide":

http://pmem.io/documents/NVDIMM_Driver_Writers_Guide.pdf

This includes adding support for targeted NVDIMM flushes called "flush
hints" in the ACPI 6.0 specification:

http://www.uefi.org/sites/default/files/resources/ACPI_6.0.pdf

For performance and media durability the mapping for a BLK aperture is
moved to a write-combining mapping which is consistent with
memcpy_to_pmem() and wmb_blk().

Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Ross Zwisler
2015-07-10 11:06:13 -06:00
committed by Dan Williams
parent 9d27a87ec9
commit c2ad29540c
2 changed files with 100 additions and 12 deletions
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15
drivers/acpi/nfit.h
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@@ -60,6 +60,11 @@ struct nfit_idt {
struct list_head list;
};
struct nfit_flush {
struct acpi_nfit_flush_address *flush;
struct list_head list;
};
struct nfit_memdev {
struct acpi_nfit_memory_map *memdev;
struct list_head list;
@@ -77,6 +82,7 @@ struct nfit_mem {
struct acpi_nfit_system_address *spa_bdw;
struct acpi_nfit_interleave *idt_dcr;
struct acpi_nfit_interleave *idt_bdw;
struct nfit_flush *nfit_flush;
struct list_head list;
struct acpi_device *adev;
unsigned long dsm_mask;
@@ -88,6 +94,7 @@ struct acpi_nfit_desc {
struct mutex spa_map_mutex;
struct list_head spa_maps;
struct list_head memdevs;
struct list_head flushes;
struct list_head dimms;
struct list_head spas;
struct list_head dcrs;
@@ -109,7 +116,7 @@ struct nfit_blk {
struct nfit_blk_mmio {
union {
void __iomem *base;
void *aperture;
void __pmem *aperture;
};
u64 size;
u64 base_offset;
@@ -123,6 +130,12 @@ struct nfit_blk {
u64 bdw_offset; /* post interleave offset */
u64 stat_offset;
u64 cmd_offset;
void __iomem *nvdimm_flush;
};
enum spa_map_type {
SPA_MAP_CONTROL,
SPA_MAP_APERTURE,
};
struct nfit_spa_mapping {