From: Jean-Philippe Brucker Date: Thu, 1 Oct 2015 12:47:16 +0000 (+0100) Subject: irqchip/gic-v3: Specialize readq and writeq accesses X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=72c971262f00185b4c6208812645c3feab4c77a3;p=linux-beck.git irqchip/gic-v3: Specialize readq and writeq accesses On 32bit platforms, we cannot assure that an I/O ldrd or strd will be done atomically. Besides, an hypervisor would be unable to emulate such accesses. In order to allow the AArch32 version of the driver to split them into two 32bit accesses while keeping the requirement for atomic writes, this patch specializes the IROUTER and TYPER accesses. Since the latter is an ID register, it won't need to be read atomically, but we still avoid future confusion by using gic_read_typer instead of a generic gic_readq. Reviewed-by: Marc Zyngier Signed-off-by: Jean-Philippe Brucker Signed-off-by: Marc Zyngier --- diff --git a/arch/arm64/include/asm/arch_gicv3.h b/arch/arm64/include/asm/arch_gicv3.h index 1aaa63551365..030cdcb46c6b 100644 --- a/arch/arm64/include/asm/arch_gicv3.h +++ b/arch/arm64/include/asm/arch_gicv3.h @@ -163,5 +163,8 @@ static inline void gic_write_sre(u32 val) isb(); } +#define gic_read_typer(c) readq_relaxed(c) +#define gic_write_irouter(v, c) writeq_relaxed(v, c) + #endif /* __ASSEMBLY__ */ #endif /* __ASM_ARCH_GICV3_H */ diff --git a/drivers/irqchip/irq-gic-v3.c b/drivers/irqchip/irq-gic-v3.c index 6125bbd777e7..222f9cc0deae 100644 --- a/drivers/irqchip/irq-gic-v3.c +++ b/drivers/irqchip/irq-gic-v3.c @@ -392,7 +392,7 @@ static void __init gic_dist_init(void) */ affinity = gic_mpidr_to_affinity(cpu_logical_map(smp_processor_id())); for (i = 32; i < gic_data.irq_nr; i++) - writeq_relaxed(affinity, base + GICD_IROUTER + i * 8); + gic_write_irouter(affinity, base + GICD_IROUTER + i * 8); } static int gic_populate_rdist(void) @@ -423,7 +423,7 @@ static int gic_populate_rdist(void) } do { - typer = readq_relaxed(ptr + GICR_TYPER); + typer = gic_read_typer(ptr + GICR_TYPER); if ((typer >> 32) == aff) { u64 offset = ptr - gic_data.redist_regions[i].redist_base; gic_data_rdist_rd_base() = ptr; @@ -623,7 +623,7 @@ static int gic_set_affinity(struct irq_data *d, const struct cpumask *mask_val, reg = gic_dist_base(d) + GICD_IROUTER + (gic_irq(d) * 8); val = gic_mpidr_to_affinity(cpu_logical_map(cpu)); - writeq_relaxed(val, reg); + gic_write_irouter(val, reg); /* * If the interrupt was enabled, enabled it again. Otherwise,