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| author | Dave Jiang <dave.jiang@intel.com> | 2018-01-31 12:45:38 -0700 |
|---|---|---|
| committer | Ross Zwisler <ross.zwisler@linux.intel.com> | 2018-02-01 15:01:15 -0700 |
| commit | 06e8ccdab15f46dfd31292e2b75d744bc5fc2a7c (patch) | |
| tree | 00ffd44862f319520b55d29e6b4a6feef60ffbe9 /drivers/acpi/nfit/core.c | |
| parent | a7f2766ac7c359216da4e714dc117c881e39a74a (diff) | |
| download | linux-06e8ccdab15f46dfd31292e2b75d744bc5fc2a7c.tar.gz linux-06e8ccdab15f46dfd31292e2b75d744bc5fc2a7c.tar.bz2 linux-06e8ccdab15f46dfd31292e2b75d744bc5fc2a7c.zip | |
acpi: nfit: Add support for detect platform CPU cache flush on power loss
In ACPI 6.2a the platform capability structure has been added to the NFIT
tables. That provides software the ability to determine whether a system
supports the auto flushing of CPU caches on power loss. If the capability
is supported, we do not need to do dax_flush(). Plumbing the path to set the
property on per region from the NFIT tables.
This patch depends on the ACPI NFIT 6.2a platform capabilities support code
in include/acpi/actbl1.h.
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Diffstat (limited to 'drivers/acpi/nfit/core.c')
| -rw-r--r-- | drivers/acpi/nfit/core.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/drivers/acpi/nfit/core.c b/drivers/acpi/nfit/core.c index abeb4df4f22e..dc775823aea0 100644 --- a/drivers/acpi/nfit/core.c +++ b/drivers/acpi/nfit/core.c @@ -838,6 +838,18 @@ static bool add_flush(struct acpi_nfit_desc *acpi_desc, return true; } +static bool add_platform_cap(struct acpi_nfit_desc *acpi_desc, + struct acpi_nfit_capabilities *pcap) +{ + struct device *dev = acpi_desc->dev; + u32 mask; + + mask = (1 << (pcap->highest_capability + 1)) - 1; + acpi_desc->platform_cap = pcap->capabilities & mask; + dev_dbg(dev, "%s: cap: %#x\n", __func__, acpi_desc->platform_cap); + return true; +} + static void *add_table(struct acpi_nfit_desc *acpi_desc, struct nfit_table_prev *prev, void *table, const void *end) { @@ -883,6 +895,10 @@ static void *add_table(struct acpi_nfit_desc *acpi_desc, case ACPI_NFIT_TYPE_SMBIOS: dev_dbg(dev, "%s: smbios\n", __func__); break; + case ACPI_NFIT_TYPE_CAPABILITIES: + if (!add_platform_cap(acpi_desc, table)) + return err; + break; default: dev_err(dev, "unknown table '%d' parsing nfit\n", hdr->type); break; @@ -2656,6 +2672,9 @@ static int acpi_nfit_register_region(struct acpi_nfit_desc *acpi_desc, else ndr_desc->numa_node = NUMA_NO_NODE; + if(acpi_desc->platform_cap & ACPI_NFIT_CAPABILITY_CACHE_FLUSH) + set_bit(ND_REGION_PERSIST_CACHE, &ndr_desc->flags); + list_for_each_entry(nfit_memdev, &acpi_desc->memdevs, list) { struct acpi_nfit_memory_map *memdev = nfit_memdev->memdev; struct nd_mapping_desc *mapping; @@ -3464,6 +3483,7 @@ static __init int nfit_init(void) BUILD_BUG_ON(sizeof(struct acpi_nfit_smbios) != 9); BUILD_BUG_ON(sizeof(struct acpi_nfit_control_region) != 80); BUILD_BUG_ON(sizeof(struct acpi_nfit_data_region) != 40); + BUILD_BUG_ON(sizeof(struct acpi_nfit_capabilities) != 16); guid_parse(UUID_VOLATILE_MEMORY, &nfit_uuid[NFIT_SPA_VOLATILE]); guid_parse(UUID_PERSISTENT_MEMORY, &nfit_uuid[NFIT_SPA_PM]); |