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Date: Fri, 9 Feb 2018 17:54:50 +0000
From: Suzuki K Poulose <suzuki.poulose@....com>
To: linux-arm-kernel@...ts.infradead.org
Cc: dave.martin@....com, linux-kernel@...r.kernel.org,
will.deacon@....com, catalin.marinas@....com, marc.zyngier@....com,
mark.rutland@....com, jnair@...iumnetworks.com,
ckadabi@...eaurora.org, robin.murphy@....com,
ard.biesheuvel@...aro.org,
Suzuki K Poulose <suzuki.poulose@....com>
Subject: [PATCH v3 10/21] arm64: capabilities: Group handling of features and errata workarounds
Now that the features and errata workarounds have the same
rules and flow, group the handling of the tables.
Cc: Dave Martin <dave.martin@....com>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
---
arch/arm64/kernel/cpufeature.c | 72 ++++++++++++++++++++++++------------------
1 file changed, 41 insertions(+), 31 deletions(-)
diff --git a/arch/arm64/kernel/cpufeature.c b/arch/arm64/kernel/cpufeature.c
index 45bac0c4ae91..9b111d560b30 100644
--- a/arch/arm64/kernel/cpufeature.c
+++ b/arch/arm64/kernel/cpufeature.c
@@ -504,8 +504,7 @@ static void __init init_cpu_ftr_reg(u32 sys_reg, u64 new)
}
extern const struct arm64_cpu_capabilities arm64_errata[];
-static void update_cpu_capabilities(const struct arm64_cpu_capabilities *caps,
- u16 scope_mask, const char *info);
+static void update_cpu_capabilities(u16 scope_mask);
void __init init_cpu_features(struct cpuinfo_arm64 *info)
{
@@ -554,10 +553,7 @@ void __init init_cpu_features(struct cpuinfo_arm64 *info)
* Run the errata work around and local feature checks on the
* boot CPU, once we have initialised the cpu feature infrastructure.
*/
- update_cpu_capabilities(arm64_errata, SCOPE_LOCAL_CPU,
- "enabling workaround for");
- update_cpu_capabilities(arm64_features, SCOPE_LOCAL_CPU,
- "detected feature:");
+ update_cpu_capabilities(SCOPE_LOCAL_CPU);
}
static void update_cpu_ftr_reg(struct arm64_ftr_reg *reg, u64 new)
@@ -1225,7 +1221,7 @@ static bool __this_cpu_has_cap(const struct arm64_cpu_capabilities *cap_array,
return false;
}
-static void update_cpu_capabilities(const struct arm64_cpu_capabilities *caps,
+static void __update_cpu_capabilities(const struct arm64_cpu_capabilities *caps,
u16 scope_mask, const char *info)
{
scope_mask &= ARM64_CPUCAP_SCOPE_MASK;
@@ -1240,6 +1236,14 @@ static void update_cpu_capabilities(const struct arm64_cpu_capabilities *caps,
}
}
+static void update_cpu_capabilities(u16 scope_mask)
+{
+ __update_cpu_capabilities(arm64_features, scope_mask,
+ "detected feature:");
+ __update_cpu_capabilities(arm64_errata, scope_mask,
+ "enabling workaround for");
+}
+
static int __enable_cpu_capability(void *arg)
{
const struct arm64_cpu_capabilities *cap = arg;
@@ -1253,7 +1257,7 @@ static int __enable_cpu_capability(void *arg)
* CPUs
*/
static void __init
-enable_cpu_capabilities(const struct arm64_cpu_capabilities *caps, u16 scope_mask)
+__enable_cpu_capabilities(const struct arm64_cpu_capabilities *caps, u16 scope_mask)
{
scope_mask &= ARM64_CPUCAP_SCOPE_MASK;
for (; caps->matches; caps++) {
@@ -1277,6 +1281,12 @@ enable_cpu_capabilities(const struct arm64_cpu_capabilities *caps, u16 scope_mas
}
}
+static void __init enable_cpu_capabilities(u16 scope_mask)
+{
+ __enable_cpu_capabilities(arm64_features, scope_mask);
+ __enable_cpu_capabilities(arm64_errata, scope_mask);
+}
+
/*
* Run through the list of capabilities to check for conflicts.
* If the system has already detected a capability, take necessary
@@ -1332,6 +1342,12 @@ static bool __verify_local_cpu_caps(const struct arm64_cpu_capabilities *caps_li
return true;
}
+static bool verify_local_cpu_caps(u16 scope_mask)
+{
+ return __verify_local_cpu_caps(arm64_errata, scope_mask) &&
+ __verify_local_cpu_caps(arm64_features, scope_mask);
+}
+
/*
* Check for CPU features that are used in early boot
* based on the Boot CPU value.
@@ -1371,7 +1387,6 @@ static void verify_sve_features(void)
/* Add checks on other ZCR bits here if necessary */
}
-
/*
* Run through the enabled system capabilities and enable() it on this CPU.
* The capabilities were decided based on the available CPUs at the boot time.
@@ -1382,15 +1397,9 @@ static void verify_sve_features(void)
*/
static void verify_local_cpu_capabilities(void)
{
- /*
- * The CPU Errata work arounds are detected and applied at boot time
- * and the related information is freed soon after. If the new CPU
- * requires an errata not detected at boot, fail this CPU.
- */
- if (!__verify_local_cpu_caps(arm64_errata, SCOPE_ALL))
- cpu_die_early();
- if (!__verify_local_cpu_caps(arm64_features, SCOPE_ALL))
+ if (!verify_local_cpu_caps(SCOPE_ALL))
cpu_die_early();
+
verify_local_elf_hwcaps(arm64_elf_hwcaps);
if (system_supports_32bit_el0())
@@ -1417,14 +1426,10 @@ void check_local_cpu_capabilities(void)
* Otherwise, this CPU should verify that it has all the system
* advertised capabilities.
*/
- if (!sys_caps_initialised) {
- update_cpu_capabilities(arm64_errata, SCOPE_LOCAL_CPU,
- "enabling workaround for");
- update_cpu_capabilities(arm64_features, SCOPE_LOCAL_CPU,
- "detected feature:");
- } else {
+ if (!sys_caps_initialised)
+ update_cpu_capabilities(SCOPE_LOCAL_CPU);
+ else
verify_local_cpu_capabilities();
- }
}
DEFINE_STATIC_KEY_FALSE(arm64_const_caps_ready);
@@ -1443,18 +1448,23 @@ bool this_cpu_has_cap(unsigned int cap)
__this_cpu_has_cap(arm64_errata, cap));
}
+static void __init setup_system_capabilities(void)
+{
+ /*
+ * We have finalised the system-wide safe feature
+ * registers, finalise the capabilities that depend
+ * on it. Also enable all the available capabilities.
+ */
+ update_cpu_capabilities(SCOPE_SYSTEM);
+ enable_cpu_capabilities(SCOPE_ALL);
+}
+
void __init setup_cpu_features(void)
{
u32 cwg;
int cls;
- /* Set the CPU feature capabilies */
- update_cpu_capabilities(arm64_features, SCOPE_SYSTEM,
- "detected feature:");
- update_cpu_capabilities(arm64_errata, SCOPE_SYSTEM,
- "enabling workaround for");
- enable_cpu_capabilities(arm64_features, SCOPE_ALL);
- enable_cpu_capabilities(arm64_errata, SCOPE_ALL);
+ setup_system_capabilities();
mark_const_caps_ready();
setup_elf_hwcaps(arm64_elf_hwcaps);
--
2.14.3
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