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ACPI: tables: PPTT: Populate cache-id if provided by firmware

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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>
This commit is contained in:
James Morse 2021-06-01 13:17:35 +01:00 committed by Rafael J. Wysocki
parent 614124bea7
commit 7ca1a8014d
1 changed files with 14 additions and 4 deletions
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18
drivers/acpi/pptt.c
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@ -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++;
}