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irqchip/gic-v3-its: Synchronise INV command targetting a VLPI using VSYNC

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We have so far alwways invalidated VLPIs usinc an INV+SYNC
sequence, but that's pretty wrong for two reasons:

- SYNC only synchronises physical LPIs
- The collection ID that for the associated LPI doesn't match
  the redistributor the vPE is associated with

Instead, send an INV+VSYNC for forwarded LPIs, ensuring that
the ITS can properly synchronise the invalidation of VLPIs.

Fixes: 015ec0386a ("irqchip/gic-v3-its: Add VLPI configuration handling")
Reported-by: Zenghui Yu <yuzenghui@huawei.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20191108165805.3071-9-maz@kernel.org
This commit is contained in:
Marc Zyngier 2019-11-08 16:58:02 +00:00
parent c1d4d5cd20
commit 286146960a
1 changed files with 35 additions and 1 deletions
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36
drivers/irqchip/irq-gic-v3-its.c
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@ -703,6 +703,24 @@ static struct its_vpe *its_build_vmovp_cmd(struct its_node *its,
return valid_vpe(its, desc->its_vmovp_cmd.vpe);
}
static struct its_vpe *its_build_vinv_cmd(struct its_node *its,
struct its_cmd_block *cmd,
struct its_cmd_desc *desc)
{
struct its_vlpi_map *map;
map = dev_event_to_vlpi_map(desc->its_inv_cmd.dev,
desc->its_inv_cmd.event_id);
its_encode_cmd(cmd, GITS_CMD_INV);
its_encode_devid(cmd, desc->its_inv_cmd.dev->device_id);
its_encode_event_id(cmd, desc->its_inv_cmd.event_id);
its_fixup_cmd(cmd);
return valid_vpe(its, map->vpe);
}
static u64 its_cmd_ptr_to_offset(struct its_node *its,
struct its_cmd_block *ptr)
{
@ -1069,6 +1087,20 @@ static void its_send_vinvall(struct its_node *its, struct its_vpe *vpe)
its_send_single_vcommand(its, its_build_vinvall_cmd, &desc);
}
static void its_send_vinv(struct its_device *dev, u32 event_id)
{
struct its_cmd_desc desc;
/*
* There is no real VINV command. This is just a normal INV,
* with a VSYNC instead of a SYNC.
*/
desc.its_inv_cmd.dev = dev;
desc.its_inv_cmd.event_id = event_id;
its_send_single_vcommand(dev->its, its_build_vinv_cmd, &desc);
}
/*
* irqchip functions - assumes MSI, mostly.
*/
@ -1143,8 +1175,10 @@ static void lpi_update_config(struct irq_data *d, u8 clr, u8 set)
lpi_write_config(d, clr, set);
if (gic_rdists->has_direct_lpi && !irqd_is_forwarded_to_vcpu(d))
direct_lpi_inv(d);
else
else if (!irqd_is_forwarded_to_vcpu(d))
its_send_inv(its_dev, its_get_event_id(d));
else
its_send_vinv(its_dev, its_get_event_id(d));
}
static void its_vlpi_set_doorbell(struct irq_data *d, bool enable)