The type of a cache might not be specified by architectural mechanisms (ie system registers), but its type might be specified in the PPTT. In this case, we should populate the type of the cache, rather than leave it undefined. This fixes the issue where the cacheinfo driver will not populate sysfs for such caches, resulting in the information missing from utilities like lstopo and lscpu, thus degrading the user experience. Fixes: 2bd00bcd73e5 (ACPI/PPTT: Add Processor Properties Topology Table parsing) Reported-by: Vijaya Kumar K <vkilari@xxxxxxxxxxxxxx> Signed-off-by: Jeffrey Hugo <jhugo@xxxxxxxxxxxxxx> --- drivers/acpi/pptt.c | 30 +++++++++++++----------------- 1 file changed, 13 insertions(+), 17 deletions(-) diff --git a/drivers/acpi/pptt.c b/drivers/acpi/pptt.c index d1e26cb..38ac30e 100644 --- a/drivers/acpi/pptt.c +++ b/drivers/acpi/pptt.c @@ -357,25 +357,15 @@ static void update_cache_properties(struct cacheinfo *this_leaf, struct acpi_pptt_cache *found_cache, struct acpi_pptt_processor *cpu_node) { - int valid_flags = 0; - this_leaf->fw_token = cpu_node; - if (found_cache->flags & ACPI_PPTT_SIZE_PROPERTY_VALID) { + if (found_cache->flags & ACPI_PPTT_SIZE_PROPERTY_VALID) this_leaf->size = found_cache->size; - valid_flags++; - } - if (found_cache->flags & ACPI_PPTT_LINE_SIZE_VALID) { + if (found_cache->flags & ACPI_PPTT_LINE_SIZE_VALID) this_leaf->coherency_line_size = found_cache->line_size; - valid_flags++; - } - if (found_cache->flags & ACPI_PPTT_NUMBER_OF_SETS_VALID) { + if (found_cache->flags & ACPI_PPTT_NUMBER_OF_SETS_VALID) this_leaf->number_of_sets = found_cache->number_of_sets; - valid_flags++; - } - if (found_cache->flags & ACPI_PPTT_ASSOCIATIVITY_VALID) { + if (found_cache->flags & ACPI_PPTT_ASSOCIATIVITY_VALID) this_leaf->ways_of_associativity = found_cache->associativity; - valid_flags++; - } if (found_cache->flags & ACPI_PPTT_WRITE_POLICY_VALID) { switch (found_cache->attributes & ACPI_PPTT_MASK_WRITE_POLICY) { case ACPI_PPTT_CACHE_POLICY_WT: @@ -402,11 +392,17 @@ static void update_cache_properties(struct cacheinfo *this_leaf, } } /* - * If the above flags are valid, and the cache type is NOCACHE - * update the cache type as well. + * If cache type is NOCACHE, then the cache hasn't been specified + * via other mechanisms. Update the type if a cache type has been + * provided. + * + * Note, we assume such caches are unified based on conventional system + * design and known examples. Significant work is required elsewhere to + * fully support data/instruction only type caches which are only + * specified in PPTT. */ if (this_leaf->type == CACHE_TYPE_NOCACHE && - valid_flags == PPTT_CHECKED_ATTRIBUTES) + found_cache->flags & ACPI_PPTT_CACHE_TYPE_VALID) this_leaf->type = CACHE_TYPE_UNIFIED; } -- Qualcomm Datacenter Technologies as an affiliate of Qualcomm Technologies, Inc. Qualcomm Technologies, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project.