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Message-Id: <20260128-ssqosid-cbqri-v2-13-dca586b091b9@kernel.org>
Date: Wed, 28 Jan 2026 12:27:34 -0800
From: Drew Fustini <fustini@...nel.org>
To: Paul Walmsley <pjw@...nel.org>, Palmer Dabbelt <palmer@...belt.com>,
Albert Ou <aou@...s.berkeley.edu>, Alexandre Ghiti <alex@...ti.fr>,
Radim Krčmář <rkrcmar@...tanamicro.com>,
Samuel Holland <samuel.holland@...ive.com>,
Adrien Ricciardi <aricciardi@...libre.com>,
Nicolas Pitre <npitre@...libre.com>,
Kornel Dulęba <mindal@...ihalf.com>,
Atish Patra <atish.patra@...ux.dev>,
Atish Kumar Patra <atishp@...osinc.com>,
Vasudevan Srinivasan <vasu@...osinc.com>, Ved Shanbhogue <ved@...osinc.com>,
yunhui cui <cuiyunhui@...edance.com>, Chen Pei <cp0613@...ux.alibaba.com>,
Liu Zhiwei <zhiwei_liu@...ux.alibaba.com>, Weiwei Li <liwei1518@...il.com>,
guo.wenjia23@....com.cn, liu.qingtao2@....com.cn,
Reinette Chatre <reinette.chatre@...el.com>,
Tony Luck <tony.luck@...el.com>, Babu Moger <babu.moger@....com>,
Peter Newman <peternewman@...gle.com>, Fenghua Yu <fenghua.yu@...el.com>,
James Morse <james.morse@....com>, Ben Horgan <ben.horgan@....com>,
Dave Martin <Dave.Martin@....com>, Drew Fustini <fustini@...nel.org>,
linux-kernel@...r.kernel.org, linux-riscv@...ts.infradead.org,
x86@...nel.org, Rob Herring <robh@...nel.org>,
"Rafael J. Wysocki" <rafael@...nel.org>, Len Brown <lenb@...nel.org>,
Robert Moore <robert.moore@...el.com>, Sunil V L <sunilvl@...tanamicro.com>,
Krzysztof Kozlowski <krzk+dt@...nel.org>,
Conor Dooley <conor+dt@...nel.org>
Cc: Paul Walmsley <paul.walmsley@...ive.com>, linux-acpi@...r.kernel.org,
acpica-devel@...ts.linux.dev, devicetree@...r.kernel.org
Subject: [PATCH RFC v2 13/17] acpi: pptt: Add helper to find a cache from
id
Add function to find the pointer to an instance of acpi_pptt_cache.
find_acpi_cache_from_id() is based on find_acpi_cache_level_from_id()
from commit c4170570cc7f ("ACPI / PPTT: Find PPTT cache level by ID") in
the morse/mpam/snapshot/v6.14-rc1 branch.
TODO: find_acpi_cache_level_from_id() has changed since then so this
function should be updated. In additon, there may be a simpler way for
acpi_parse_rqsc() than adding this function to get a pointer to
acpi_pptt_cache.
Signed-off-by: Drew Fustini <fustini@...nel.org>
---
drivers/acpi/pptt.c | 63 ++++++++++++++++++++++++++++++++++++++++++++++++++++
include/linux/acpi.h | 8 +++++++
2 files changed, 71 insertions(+)
diff --git a/drivers/acpi/pptt.c b/drivers/acpi/pptt.c
index de5f8c018333..d1002673dc39 100644
--- a/drivers/acpi/pptt.c
+++ b/drivers/acpi/pptt.c
@@ -1063,3 +1063,66 @@ int acpi_pptt_get_cpumask_from_cache_id(u32 cache_id, cpumask_t *cpus)
return 0;
}
+
+/*
+ * find_acpi_cache_from_id() is adapted from find_acpi_cache_level_from_id()
+ * introduced by c4170570cc7f ("ACPI / PPTT: Find PPTT cache level by ID")
+ * in the morse/mpam/snapshot/v6.14-rc1 branch.
+ *
+ * TODO: find_acpi_cache_level_from_id() has changed since then so this
+ * function should be updated. In additon, there may be a simpler way for
+ * acpi_parse_rqsc() than adding this function to get a pointer to
+ * acpi_pptt_cache.
+ */
+struct acpi_pptt_cache *find_acpi_cache_from_id(u32 cache_id)
+{
+ u32 acpi_cpu_id;
+ acpi_status status;
+ int level, cpu, num_levels;
+ struct acpi_pptt_cache *cache;
+ struct acpi_table_header *table;
+ struct acpi_pptt_cache_v1 *cache_v1;
+ struct acpi_pptt_processor *cpu_node;
+
+ status = acpi_get_table(ACPI_SIG_PPTT, 0, &table);
+ if (ACPI_FAILURE(status)) {
+ acpi_pptt_warn_missing();
+ return NULL;
+ }
+
+ if (table->revision < 3) {
+ acpi_put_table(table);
+ return NULL;
+ }
+
+ for_each_possible_cpu(cpu) {
+ num_levels = 0;
+ acpi_cpu_id = get_acpi_id_for_cpu(cpu);
+
+ cpu_node = acpi_find_processor_node(table, acpi_cpu_id);
+ if (!cpu_node)
+ break;
+ num_levels = acpi_count_levels(table, cpu_node, NULL);
+
+ for (level = 1; level <= num_levels; level++) {
+ cache = acpi_find_cache_node(table, acpi_cpu_id,
+ ACPI_PPTT_CACHE_TYPE_UNIFIED,
+ level, &cpu_node);
+ if (!cache)
+ continue;
+
+ cache_v1 = ACPI_ADD_PTR(struct acpi_pptt_cache_v1,
+ cache,
+ sizeof(struct acpi_pptt_cache));
+
+ if (cache->flags & ACPI_PPTT_CACHE_ID_VALID &&
+ cache_v1->cache_id == cache_id) {
+ acpi_put_table(table);
+ return cache;
+ }
+ }
+ }
+
+ acpi_put_table(table);
+ return NULL;
+}
diff --git a/include/linux/acpi.h b/include/linux/acpi.h
index fbf0c3a65f59..fee6a5059a46 100644
--- a/include/linux/acpi.h
+++ b/include/linux/acpi.h
@@ -1546,6 +1546,7 @@ int find_acpi_cpu_topology_package(unsigned int cpu);
int find_acpi_cpu_topology_hetero_id(unsigned int cpu);
void acpi_pptt_get_cpus_from_container(u32 acpi_cpu_id, cpumask_t *cpus);
int find_acpi_cache_level_from_id(u32 cache_id);
+struct acpi_pptt_cache *find_acpi_cache_from_id(u32 cache_id);
int acpi_pptt_get_cpumask_from_cache_id(u32 cache_id, cpumask_t *cpus);
#else
static inline int acpi_pptt_cpu_is_thread(unsigned int cpu)
@@ -1570,10 +1571,17 @@ static inline int find_acpi_cpu_topology_hetero_id(unsigned int cpu)
}
static inline void acpi_pptt_get_cpus_from_container(u32 acpi_cpu_id,
cpumask_t *cpus) { }
+
static inline int find_acpi_cache_level_from_id(u32 cache_id)
{
return -ENOENT;
}
+
+static inline struct acpi_pptt_cache *find_acpi_cache_from_id(u32 cache_id)
+{
+ return NULL;
+}
+
static inline int acpi_pptt_get_cpumask_from_cache_id(u32 cache_id,
cpumask_t *cpus)
{
--
2.43.0
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