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drivers: base: cacheinfo: Add variable to record max cache line size

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Add coherency_max_size variable to record the maximum cache line size
for different cache levels. If it is available, we will synchronize
it as cache line size, otherwise we will use CTR_EL0.CWG reporting
in cache_line_size() for arm64.

Cc: "Rafael J. Wysocki" <rafael@kernel.org>
Cc: Jeremy Linton <jeremy.linton@arm.com>
Cc: Will Deacon <will.deacon@arm.com>
Reviewed-by: Sudeep Holla <sudeep.holla@arm.com>
Reviewed-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Shaokun Zhang <zhangshaokun@hisilicon.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
This commit is contained in:
Shaokun Zhang 2019-05-28 10:16:53 +08:00 committed by Catalin Marinas
parent 6dcdefcde4
commit 9a83c84c3a
2 changed files with 7 additions and 0 deletions
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5
drivers/base/cacheinfo.c
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@ -213,6 +213,8 @@ int __weak cache_setup_acpi(unsigned int cpu)
return -ENOTSUPP;
}
unsigned int coherency_max_size;
static int cache_shared_cpu_map_setup(unsigned int cpu)
{
struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);
@ -251,6 +253,9 @@ static int cache_shared_cpu_map_setup(unsigned int cpu)
cpumask_set_cpu(i, &this_leaf->shared_cpu_map);
}
}
/* record the maximum cache line size */
if (this_leaf->coherency_line_size > coherency_max_size)
coherency_max_size = this_leaf->coherency_line_size;
}
return 0;

2
include/linux/cacheinfo.h
View File

@ -17,6 +17,8 @@ enum cache_type {
CACHE_TYPE_UNIFIED = BIT(2),
};
extern unsigned int coherency_max_size;
/**
* struct cacheinfo - represent a cache leaf node
* @id: This cache's id. It is unique among caches with the same (type, level).