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irqchip/gic-v3-its: Factor out wait_for_syncr primitive

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Waiting for a redistributor to have performed an operation is a
common thing to do, and the idiom is already spread around.
As we're going to make even more use of this, let's have a primitive
that does just that.

Signed-off-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Zenghui Yu <yuzenghui@huawei.com>
Link: https://lore.kernel.org/r/20191027144234.8395-3-maz@kernel.org
Link: https://lore.kernel.org/r/20191108165805.3071-3-maz@kernel.org
This commit is contained in:
Marc Zyngier 2019-11-08 16:57:56 +00:00
parent 898aa5ce61
commit 2f4f064b31
1 changed files with 9 additions and 6 deletions
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15
drivers/irqchip/irq-gic-v3-its.c
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@ -1093,6 +1093,12 @@ static void lpi_write_config(struct irq_data *d, u8 clr, u8 set)
dsb(ishst);
}
static void wait_for_syncr(void __iomem *rdbase)
{
while (gic_read_lpir(rdbase + GICR_SYNCR) & 1)
cpu_relax();
}
static void lpi_update_config(struct irq_data *d, u8 clr, u8 set)
{
struct its_device *its_dev = irq_data_get_irq_chip_data(d);
@ -2775,8 +2781,7 @@ static void its_vpe_db_proxy_move(struct its_vpe *vpe, int from, int to)
rdbase = per_cpu_ptr(gic_rdists->rdist, from)->rd_base;
gic_write_lpir(vpe->vpe_db_lpi, rdbase + GICR_CLRLPIR);
while (gic_read_lpir(rdbase + GICR_SYNCR) & 1)
cpu_relax();
wait_for_syncr(rdbase);
return;
}
@ -2932,8 +2937,7 @@ static void its_vpe_send_inv(struct irq_data *d)
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();
wait_for_syncr(rdbase);
} else {
its_vpe_send_cmd(vpe, its_send_inv);
}
@ -2975,8 +2979,7 @@ static int its_vpe_set_irqchip_state(struct irq_data *d,
gic_write_lpir(vpe->vpe_db_lpi, rdbase + GICR_SETLPIR);
} else {
gic_write_lpir(vpe->vpe_db_lpi, rdbase + GICR_CLRLPIR);
while (gic_read_lpir(rdbase + GICR_SYNCR) & 1)
cpu_relax();
wait_for_syncr(rdbase);
}
} else {
if (state)