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arm64: capabilities: Filter the entries based on a given mask

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While processing the list of capabilities, it is useful to
filter out some of the entries based on the given mask for the
scope of the capabilities to allow better control. This can be
used later for handling LOCAL vs SYSTEM wide capabilities and more.
All capabilities should have their scope set to either LOCAL_CPU or
SYSTEM. No functional/flow change.

Cc: Will Deacon <will.deacon@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Reviewed-by: Dave Martin <dave.martin@arm.com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Suzuki K Poulose 2018-03-26 15:12:34 +01:00 committed by Will Deacon
parent eaac4d83da
commit cce360b54c
2 changed files with 23 additions and 11 deletions
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1
arch/arm64/include/asm/cpufeature.h
View File

@ -211,6 +211,7 @@ extern struct arm64_ftr_reg arm64_ftr_reg_ctrel0;
#define SCOPE_SYSTEM ARM64_CPUCAP_SCOPE_SYSTEM
#define SCOPE_LOCAL_CPU ARM64_CPUCAP_SCOPE_LOCAL_CPU
#define SCOPE_ALL ARM64_CPUCAP_SCOPE_MASK
/*
* Is it permitted for a late CPU to have this capability when system

33
arch/arm64/kernel/cpufeature.c
View File

@ -1256,10 +1256,12 @@ static bool __this_cpu_has_cap(const struct arm64_cpu_capabilities *cap_array,
}
static void update_cpu_capabilities(const struct arm64_cpu_capabilities *caps,
const char *info)
u16 scope_mask, const char *info)
{
scope_mask &= ARM64_CPUCAP_SCOPE_MASK;
for (; caps->matches; caps++) {
if (!caps->matches(caps, cpucap_default_scope(caps)))
if (!(caps->type & scope_mask) ||
!caps->matches(caps, cpucap_default_scope(caps)))
continue;
if (!cpus_have_cap(caps->capability) && caps->desc)
@ -1281,12 +1283,14 @@ static int __enable_cpu_capability(void *arg)
* CPUs
*/
static void __init
enable_cpu_capabilities(const struct arm64_cpu_capabilities *caps)
enable_cpu_capabilities(const struct arm64_cpu_capabilities *caps,
u16 scope_mask)
{
scope_mask &= ARM64_CPUCAP_SCOPE_MASK;
for (; caps->matches; caps++) {
unsigned int num = caps->capability;
if (!cpus_have_cap(num))
if (!(caps->type & scope_mask) || !cpus_have_cap(num))
continue;
/* Ensure cpus_have_const_cap(num) works */
@ -1313,12 +1317,18 @@ enable_cpu_capabilities(const struct arm64_cpu_capabilities *caps)
* Returns "false" on conflicts.
*/
static bool
__verify_local_cpu_caps(const struct arm64_cpu_capabilities *caps_list)
__verify_local_cpu_caps(const struct arm64_cpu_capabilities *caps_list,
u16 scope_mask)
{
bool cpu_has_cap, system_has_cap;
const struct arm64_cpu_capabilities *caps;
scope_mask &= ARM64_CPUCAP_SCOPE_MASK;
for (caps = caps_list; caps->matches; caps++) {
if (!(caps->type & scope_mask))
continue;
cpu_has_cap = __this_cpu_has_cap(caps_list, caps->capability);
system_has_cap = cpus_have_cap(caps->capability);
@ -1381,7 +1391,7 @@ verify_local_elf_hwcaps(const struct arm64_cpu_capabilities *caps)
static void verify_local_cpu_features(void)
{
if (!__verify_local_cpu_caps(arm64_features))
if (!__verify_local_cpu_caps(arm64_features, SCOPE_ALL))
cpu_die_early();
}
@ -1409,18 +1419,19 @@ static void verify_sve_features(void)
*/
static void verify_local_cpu_errata_workarounds(void)
{
if (!__verify_local_cpu_caps(arm64_errata))
if (!__verify_local_cpu_caps(arm64_errata, SCOPE_ALL))
cpu_die_early();
}
static void update_cpu_errata_workarounds(void)
{
update_cpu_capabilities(arm64_errata, "enabling workaround for");
update_cpu_capabilities(arm64_errata, SCOPE_ALL,
"enabling workaround for");
}
static void __init enable_errata_workarounds(void)
{
enable_cpu_capabilities(arm64_errata);
enable_cpu_capabilities(arm64_errata, SCOPE_ALL);
}
/*
@ -1466,8 +1477,8 @@ void check_local_cpu_capabilities(void)
static void __init setup_feature_capabilities(void)
{
update_cpu_capabilities(arm64_features, "detected:");
enable_cpu_capabilities(arm64_features);
update_cpu_capabilities(arm64_features, SCOPE_ALL, "detected:");
enable_cpu_capabilities(arm64_features, SCOPE_ALL);
}
DEFINE_STATIC_KEY_FALSE(arm64_const_caps_ready);