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irqchip/gic-v4.1: Add VPE eviction callback

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When descheduling a VPE, special care must be taken to tell the GIC
about whether we want to receive a doorbell or not. This is a
major improvement on GICv4.0, where the doorbell had to be separately
enabled/disabled.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Zenghui Yu <yuzenghui@huawei.com>
Link: https://lore.kernel.org/r/20191224111055.11836-13-maz@kernel.org
This commit is contained in:
Marc Zyngier 2019-12-24 11:10:35 +00:00
parent 91bf6395f7
commit e64fab1a14
1 changed files with 42 additions and 11 deletions
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53
drivers/irqchip/irq-gic-v3-its.c
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@ -2630,7 +2630,7 @@ static int __init allocate_lpi_tables(void)
return 0;
}
static u64 its_clear_vpend_valid(void __iomem *vlpi_base)
static u64 its_clear_vpend_valid(void __iomem *vlpi_base, u64 clr, u64 set)
{
u32 count = 1000000; /* 1s! */
bool clean;
@ -2638,6 +2638,8 @@ static u64 its_clear_vpend_valid(void __iomem *vlpi_base)
val = gits_read_vpendbaser(vlpi_base + GICR_VPENDBASER);
val &= ~GICR_VPENDBASER_Valid;
val &= ~clr;
val |= set;
gits_write_vpendbaser(val, vlpi_base + GICR_VPENDBASER);
do {
@ -2650,6 +2652,11 @@ static u64 its_clear_vpend_valid(void __iomem *vlpi_base)
}
} while (!clean && count);
if (unlikely(val & GICR_VPENDBASER_Dirty)) {
pr_err_ratelimited("ITS virtual pending table not cleaning\n");
val |= GICR_VPENDBASER_PendingLast;
}
return val;
}
@ -2758,7 +2765,7 @@ static void its_cpu_init_lpis(void)
* ancient programming gets left in and has possibility of
* corrupting memory.
*/
val = its_clear_vpend_valid(vlpi_base);
val = its_clear_vpend_valid(vlpi_base, 0, 0);
WARN_ON(val & GICR_VPENDBASER_Dirty);
}
@ -3438,16 +3445,10 @@ static void its_vpe_deschedule(struct its_vpe *vpe)
void __iomem *vlpi_base = gic_data_rdist_vlpi_base();
u64 val;
val = its_clear_vpend_valid(vlpi_base);
val = its_clear_vpend_valid(vlpi_base, 0, 0);
if (unlikely(val & GICR_VPENDBASER_Dirty)) {
pr_err_ratelimited("ITS virtual pending table not cleaning\n");
vpe->idai = false;
vpe->pending_last = true;
} else {
vpe->idai = !!(val & GICR_VPENDBASER_IDAI);
vpe->pending_last = !!(val & GICR_VPENDBASER_PendingLast);
}
vpe->idai = !!(val & GICR_VPENDBASER_IDAI);
vpe->pending_last = !!(val & GICR_VPENDBASER_PendingLast);
}
static void its_vpe_invall(struct its_vpe *vpe)
@ -3639,6 +3640,35 @@ static void its_vpe_4_1_schedule(struct its_vpe *vpe,
gits_write_vpendbaser(val, vlpi_base + GICR_VPENDBASER);
}
static void its_vpe_4_1_deschedule(struct its_vpe *vpe,
struct its_cmd_info *info)
{
void __iomem *vlpi_base = gic_data_rdist_vlpi_base();
u64 val;
if (info->req_db) {
/*
* vPE is going to block: make the vPE non-resident with
* PendingLast clear and DB set. The GIC guarantees that if
* we read-back PendingLast clear, then a doorbell will be
* delivered when an interrupt comes.
*/
val = its_clear_vpend_valid(vlpi_base,
GICR_VPENDBASER_PendingLast,
GICR_VPENDBASER_4_1_DB);
vpe->pending_last = !!(val & GICR_VPENDBASER_PendingLast);
} else {
/*
* We're not blocking, so just make the vPE non-resident
* with PendingLast set, indicating that we'll be back.
*/
val = its_clear_vpend_valid(vlpi_base,
0,
GICR_VPENDBASER_PendingLast);
vpe->pending_last = true;
}
}
static int its_vpe_4_1_set_vcpu_affinity(struct irq_data *d, void *vcpu_info)
{
struct its_vpe *vpe = irq_data_get_irq_chip_data(d);
@ -3650,6 +3680,7 @@ static int its_vpe_4_1_set_vcpu_affinity(struct irq_data *d, void *vcpu_info)
return 0;
case DESCHEDULE_VPE:
its_vpe_4_1_deschedule(vpe, info);
return 0;
case INVALL_VPE: