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irqchip/gic-v3-its: Add VPE interrupt masking

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When masking/unmasking a doorbell interrupt, it is necessary
to issue an invalidation to the corresponding redistributor.
We use the DirectLPI feature by writting directly to the corresponding
redistributor.

Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Marc Zyngier 2016-12-20 15:20:38 +00:00
parent 3171a47a22
commit f6a91da7c7
3 changed files with 41 additions and 0 deletions
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6
arch/arm/include/asm/arch_gicv3.h
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@ -275,6 +275,12 @@ static inline u64 __gic_readq_nonatomic(const volatile void __iomem *addr)
#define gicr_read_pendbaser(c) __gic_readq_nonatomic(c)
#define gicr_write_pendbaser(v, c) __gic_writeq_nonatomic(v, c)
/*
* GICR_xLPIR - only the lower bits are significant
*/
#define gic_read_lpir(c) readl_relaxed(c)
#define gic_write_lpir(v, c) writel_relaxed(lower_32_bits(v), c)
/*
* GITS_TYPER is an ID register and doesn't need atomicity.
*/

2
arch/arm64/include/asm/arch_gicv3.h
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@ -116,6 +116,8 @@ static inline void gic_write_bpr1(u32 val)
#define gic_read_typer(c) readq_relaxed(c)
#define gic_write_irouter(v, c) writeq_relaxed(v, c)
#define gic_read_lpir(c) readq_relaxed(c)
#define gic_write_lpir(v, c) writeq_relaxed(v, c)
#define gic_flush_dcache_to_poc(a,l) __flush_dcache_area((a), (l))

33
drivers/irqchip/irq-gic-v3-its.c
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@ -2336,8 +2336,41 @@ static int its_vpe_set_vcpu_affinity(struct irq_data *d, void *vcpu_info)
}
}
static void its_vpe_send_inv(struct irq_data *d)
{
struct its_vpe *vpe = irq_data_get_irq_chip_data(d);
void __iomem *rdbase;
rdbase = per_cpu_ptr(gic_rdists->rdist, vpe->col_idx)->rd_base;
gic_write_lpir(vpe->vpe_db_lpi, rdbase + GICR_INVLPIR);
while (gic_read_lpir(rdbase + GICR_SYNCR) & 1)
cpu_relax();
}
static void its_vpe_mask_irq(struct irq_data *d)
{
/*
* We need to unmask the LPI, which is described by the parent
* irq_data. Instead of calling into the parent (which won't
* exactly do the right thing, let's simply use the
* parent_data pointer. Yes, I'm naughty.
*/
lpi_write_config(d->parent_data, LPI_PROP_ENABLED, 0);
its_vpe_send_inv(d);
}
static void its_vpe_unmask_irq(struct irq_data *d)
{
/* Same hack as above... */
lpi_write_config(d->parent_data, 0, LPI_PROP_ENABLED);
its_vpe_send_inv(d);
}
static struct irq_chip its_vpe_irq_chip = {
.name = "GICv4-vpe",
.irq_mask = its_vpe_mask_irq,
.irq_unmask = its_vpe_unmask_irq,
.irq_eoi = irq_chip_eoi_parent,
.irq_set_affinity = its_vpe_set_affinity,
.irq_set_vcpu_affinity = its_vpe_set_vcpu_affinity,
};