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| author | James Morse <james.morse@arm.com> | 2021-06-01 15:17:35 +0300 |
|---|---|---|
| committer | Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2021-06-07 16:55:02 +0300 |
| commit | 7ca1a8014d860d23001605f63c1402f1092a58d5 (patch) | |
| tree | 2844841e1e9393ceb5416b363cd077dbc1c43501 /drivers/acpi/pptt.c | |
| parent | 614124bea77e452aa6df7a8714e8bc820b489922 (diff) | |
| download | linux-7ca1a8014d860d23001605f63c1402f1092a58d5.tar.xz | |
ACPI: tables: PPTT: Populate cache-id if provided by firmware
ACPI 6.4 adds a 'cache id' to the PPTT Cache Type Structure.
Copy this property across into the cacheinfo leaf when it was
provided by firmware.
This value gets exposed to userspace as:
/sys/devices/system/cpu/cpu*/cache/index*/id.
See the "Cache IDs" section of Documentation/x86/resctrl.rst.
Co-authored-by: Joey Gouly <joey.gouly@arm.com>
Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Joey Gouly <joey.gouly@arm.com>
[ rjw: Subject and changelog edits ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/acpi/pptt.c')
| -rw-r--r-- | drivers/acpi/pptt.c | 18 |
1 files changed, 14 insertions, 4 deletions
diff --git a/drivers/acpi/pptt.c b/drivers/acpi/pptt.c index 4ae93350b70d..fe69dc518f31 100644 --- a/drivers/acpi/pptt.c +++ b/drivers/acpi/pptt.c @@ -347,6 +347,7 @@ static struct acpi_pptt_cache *acpi_find_cache_node(struct acpi_table_header *ta * @this_leaf: Kernel cache info structure being updated * @found_cache: The PPTT node describing this cache instance * @cpu_node: A unique reference to describe this cache instance + * @revision: The revision of the PPTT table * * The ACPI spec implies that the fields in the cache structures are used to * extend and correct the information probed from the hardware. Lets only @@ -356,8 +357,11 @@ static struct acpi_pptt_cache *acpi_find_cache_node(struct acpi_table_header *ta */ static void update_cache_properties(struct cacheinfo *this_leaf, struct acpi_pptt_cache *found_cache, - struct acpi_pptt_processor *cpu_node) + struct acpi_pptt_processor *cpu_node, + u8 revision) { + struct acpi_pptt_cache_v1* found_cache_v1; + this_leaf->fw_token = cpu_node; if (found_cache->flags & ACPI_PPTT_SIZE_PROPERTY_VALID) this_leaf->size = found_cache->size; @@ -405,6 +409,13 @@ static void update_cache_properties(struct cacheinfo *this_leaf, if (this_leaf->type == CACHE_TYPE_NOCACHE && found_cache->flags & ACPI_PPTT_CACHE_TYPE_VALID) this_leaf->type = CACHE_TYPE_UNIFIED; + + if (revision >= 3 && (found_cache->flags & ACPI_PPTT_CACHE_ID_VALID)) { + found_cache_v1 = ACPI_ADD_PTR(struct acpi_pptt_cache_v1, + found_cache, sizeof(struct acpi_pptt_cache)); + this_leaf->id = found_cache_v1->cache_id; + this_leaf->attributes |= CACHE_ID; + } } static void cache_setup_acpi_cpu(struct acpi_table_header *table, @@ -425,9 +436,8 @@ static void cache_setup_acpi_cpu(struct acpi_table_header *table, &cpu_node); pr_debug("found = %p %p\n", found_cache, cpu_node); if (found_cache) - update_cache_properties(this_leaf, - found_cache, - cpu_node); + update_cache_properties(this_leaf, found_cache, + cpu_node, table->revision); index++; } |