Messages in this thread Patch in this message | | | From | t00849498 <> | Subject | [PATCH] irqchip/gic-v3-its: Don't need VSYNC if VMAPP with {V, Alloc}=={0, x} | Date | Tue, 2 Apr 2024 11:41:47 +0000 |
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From GIC spec, a VMAPP with {V, Alloc}=={0, x} is self-synchronizing, This means the ITS command queue does not show the command as consumed until all of its effects are completed. A VSYNC with unmapped vpeid is not needed.
Signed-off-by: t00849498 <tangnianyao@huawei.com> --- drivers/irqchip/irq-gic-v3-its.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c index fca888b36680..a0ca5dcbb245 100644 --- a/drivers/irqchip/irq-gic-v3-its.c +++ b/drivers/irqchip/irq-gic-v3-its.c @@ -789,6 +789,7 @@ static struct its_vpe *its_build_vmapp_cmd(struct its_node *its, unsigned long vpt_addr, vconf_addr; u64 target; bool alloc; + bool unmap_v4_1 = !desc->its_vmapp_cmd.valid && is_v4_1(its); its_encode_cmd(cmd, GITS_CMD_VMAPP); its_encode_vpeid(cmd, desc->its_vmapp_cmd.vpe->vpe_id); @@ -832,6 +833,9 @@ static struct its_vpe *its_build_vmapp_cmd(struct its_node *its, out: its_fixup_cmd(cmd); + if (unmap_v4_1) + return NULL; + return valid_vpe(its, desc->its_vmapp_cmd.vpe); } -- 2.30.0
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