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Message-Id: <20230413091436.230134-3-pierre.gondois@arm.com>
Date: Thu, 13 Apr 2023 11:14:32 +0200
From: Pierre Gondois <pierre.gondois@....com>
To: linux-kernel@...r.kernel.org
Cc: Radu Rendec <rrendec@...hat.com>,
Alexandre Ghiti <alexghiti@...osinc.com>,
Conor Dooley <conor.dooley@...rochip.com>,
Will Deacon <will@...nel.org>,
Pierre Gondois <pierre.gondois@....com>,
Sudeep Holla <sudeep.holla@....com>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
"Rafael J. Wysocki" <rafael@...nel.org>,
Palmer Dabbelt <palmer@...osinc.com>,
Gavin Shan <gshan@...hat.com>
Subject: [PATCH v3 2/4] cacheinfo: Check cache properties are present in DT
If a Device Tree (DT) is used, the presence of cache properties is
assumed. Not finding any is not considered. For arm64 platforms,
cache information can be fetched from the clidr_el1 register.
Checking whether cache information is available in the DT
allows to switch to using clidr_el1.
init_of_cache_level()
\-of_count_cache_leaves()
will assume there a 2 cache leaves (L1 data/instruction caches), which
can be different from clidr_el1 information.
cache_setup_of_node() tries to read cache properties in the DT.
If there are none, this is considered a success. Knowing no
information was available would allow to switch to using clidr_el1.
Fixes: de0df442ee49 ("cacheinfo: Check 'cache-unified' property to count cache leaves")
Reported-by: Alexandre Ghiti <alexghiti@...osinc.com>
Link: https://lore.kernel.org/all/20230404-hatred-swimmer-6fecdf33b57a@spud/
Signed-off-by: Pierre Gondois <pierre.gondois@....com>
---
drivers/base/cacheinfo.c | 30 ++++++++++++++++++++++++++++++
1 file changed, 30 insertions(+)
diff --git a/drivers/base/cacheinfo.c b/drivers/base/cacheinfo.c
index c5d2293ac2a6..06de9a468958 100644
--- a/drivers/base/cacheinfo.c
+++ b/drivers/base/cacheinfo.c
@@ -78,6 +78,9 @@ bool last_level_cache_is_shared(unsigned int cpu_x, unsigned int cpu_y)
}
#ifdef CONFIG_OF
+
+static bool of_check_cache_nodes(struct device_node *np);
+
/* OF properties to query for a given cache type */
struct cache_type_info {
const char *size_prop;
@@ -205,6 +208,11 @@ static int cache_setup_of_node(unsigned int cpu)
return -ENOENT;
}
+ if (!of_check_cache_nodes(np)) {
+ of_node_put(np);
+ return -ENOENT;
+ }
+
prev = np;
while (index < cache_leaves(cpu)) {
@@ -229,6 +237,25 @@ static int cache_setup_of_node(unsigned int cpu)
return 0;
}
+static bool of_check_cache_nodes(struct device_node *np)
+{
+ struct device_node *next;
+
+ if (of_property_present(np, "cache-size") ||
+ of_property_present(np, "i-cache-size") ||
+ of_property_present(np, "d-cache-size") ||
+ of_property_present(np, "cache-unified"))
+ return true;
+
+ next = of_find_next_cache_node(np);
+ if (next) {
+ of_node_put(next);
+ return true;
+ }
+
+ return false;
+}
+
static int of_count_cache_leaves(struct device_node *np)
{
unsigned int leaves = 0;
@@ -260,6 +287,9 @@ int init_of_cache_level(unsigned int cpu)
struct device_node *prev = NULL;
unsigned int levels = 0, leaves, level;
+ if (!of_check_cache_nodes(np))
+ goto err_out;
+
leaves = of_count_cache_leaves(np);
if (leaves > 0)
levels = 1;
--
2.25.1
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