diff options
| author | Suzuki K Poulose <suzuki.poulose@arm.com> | 2016-11-08 13:56:20 +0000 |
|---|---|---|
| committer | Catalin Marinas <catalin.marinas@arm.com> | 2016-11-16 17:50:51 +0000 |
| commit | a4023f682739439b434165b54af7cb3676a4766e (patch) | |
| tree | ef2638d37291c56d972f20b69c59a6dee9292c18 /drivers/irqchip | |
| parent | c02433dd6de32f042cf3ffe476746b1115b8c096 (diff) | |
| download | linux-a4023f682739439b434165b54af7cb3676a4766e.tar.gz | |
arm64: Add hypervisor safe helper for checking constant capabilities
The hypervisor may not have full access to the kernel data structures and hence cannot safely use cpus_have_cap() helper for checking the system capability. Add a safe helper for hypervisors to check a constant system capability, which *doesn't* fall back to checking the bitmap maintained by the kernel. With this, make the cpus_have_cap() only check the bitmask and force constant cap checks to use the new API for quicker checks. Cc: Robert Ritcher <rritcher@cavium.com> Cc: Tirumalesh Chalamarla <tchalamarla@cavium.com> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com> Reviewed-by: Will Deacon <will.deacon@arm.com> Reviewed-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Diffstat (limited to 'drivers/irqchip')
| -rw-r--r-- | drivers/irqchip/irq-gic-v3.c | 13 |
1 files changed, 1 insertions, 12 deletions
diff --git a/drivers/irqchip/irq-gic-v3.c b/drivers/irqchip/irq-gic-v3.c index 19d642eae096..26e1d7fafb1e 100644 --- a/drivers/irqchip/irq-gic-v3.c +++ b/drivers/irqchip/irq-gic-v3.c @@ -120,11 +120,10 @@ static void gic_redist_wait_for_rwp(void) } #ifdef CONFIG_ARM64 -static DEFINE_STATIC_KEY_FALSE(is_cavium_thunderx); static u64 __maybe_unused gic_read_iar(void) { - if (static_branch_unlikely(&is_cavium_thunderx)) + if (cpus_have_const_cap(ARM64_WORKAROUND_CAVIUM_23154)) return gic_read_iar_cavium_thunderx(); else return gic_read_iar_common(); @@ -905,14 +904,6 @@ static const struct irq_domain_ops partition_domain_ops = { .select = gic_irq_domain_select, }; -static void gicv3_enable_quirks(void) -{ -#ifdef CONFIG_ARM64 - if (cpus_have_cap(ARM64_WORKAROUND_CAVIUM_23154)) - static_branch_enable(&is_cavium_thunderx); -#endif -} - static int __init gic_init_bases(void __iomem *dist_base, struct redist_region *rdist_regs, u32 nr_redist_regions, @@ -935,8 +926,6 @@ static int __init gic_init_bases(void __iomem *dist_base, gic_data.nr_redist_regions = nr_redist_regions; gic_data.redist_stride = redist_stride; - gicv3_enable_quirks(); - /* * Find out how many interrupts are supported. * The GIC only supports up to 1020 interrupt sources (SGI+PPI+SPI) |