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drm/amdgpu: refactor bad_page_work for corner case handling

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When a poison is consumed on the guest before the guest receives the host's poison creation msg, a corner case may occur to have poison_handler complete processing earlier than it should to cause the guest to hang waiting for the req_bad_pages reply during a VF FLR, resulting in the VM becoming inaccessible in stress tests.

To fix this issue, this patch refactored the mailbox sequence by seperating the bad_page_work into two parts req_bad_pages_work and handle_bad_pages_work.
Old sequence:
  1.Stop data exchange work
  2.Guest sends MB_REQ_RAS_BAD_PAGES to host and keep polling for IDH_RAS_BAD_PAGES_READY
  3.If the IDH_RAS_BAD_PAGES_READY arrives within timeout limit, re-init the data exchange region for updated bad page info
    else timeout with error message
New sequence:
req_bad_pages_work:
  1.Stop data exhange work
  2.Guest sends MB_REQ_RAS_BAD_PAGES to host
Once Guest receives IDH_RAS_BAD_PAGES_READY event
handle_bad_pages_work:
  3.re-init the data exchange region for updated bad page info

Signed-off-by: Chenglei Xie <Chenglei.Xie@amd.com>
Reviewed-by: Shravan Kumar Gande <Shravankumar.Gande@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Chenglei Xie
2025-08-07 16:52:34 -04:00
committed by Alex Deucher
parent fc4e990a32
commit d2fa0ec6e0
4 changed files with 58 additions and 13 deletions
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35
drivers/gpu/drm/amd/amdgpu/mxgpu_nv.c
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@@ -202,9 +202,6 @@ send_request:
case IDH_REQ_RAS_CPER_DUMP:
event = IDH_RAS_CPER_DUMP_READY;
break;
case IDH_REQ_RAS_BAD_PAGES:
event = IDH_RAS_BAD_PAGES_READY;
break;
default:
break;
}
@@ -359,14 +356,32 @@ static void xgpu_nv_mailbox_flr_work(struct work_struct *work)
}
}
static void xgpu_nv_mailbox_bad_pages_work(struct work_struct *work)
static void xgpu_nv_mailbox_req_bad_pages_work(struct work_struct *work)
{
struct amdgpu_virt *virt = container_of(work, struct amdgpu_virt, bad_pages_work);
struct amdgpu_virt *virt = container_of(work, struct amdgpu_virt, req_bad_pages_work);
struct amdgpu_device *adev = container_of(virt, struct amdgpu_device, virt);
if (down_read_trylock(&adev->reset_domain->sem)) {
amdgpu_virt_fini_data_exchange(adev);
amdgpu_virt_request_bad_pages(adev);
up_read(&adev->reset_domain->sem);
}
}
/**
* xgpu_nv_mailbox_handle_bad_pages_work - Reinitialize the data exchange region to get fresh bad page information
* @work: pointer to the work_struct
*
* This work handler is triggered when bad pages are ready, and it reinitializes
* the data exchange region to retrieve updated bad page information from the host.
*/
static void xgpu_nv_mailbox_handle_bad_pages_work(struct work_struct *work)
{
struct amdgpu_virt *virt = container_of(work, struct amdgpu_virt, handle_bad_pages_work);
struct amdgpu_device *adev = container_of(virt, struct amdgpu_device, virt);
if (down_read_trylock(&adev->reset_domain->sem)) {
amdgpu_virt_fini_data_exchange(adev);
amdgpu_virt_init_data_exchange(adev);
up_read(&adev->reset_domain->sem);
}
@@ -397,10 +412,15 @@ static int xgpu_nv_mailbox_rcv_irq(struct amdgpu_device *adev,
struct amdgpu_ras *ras = amdgpu_ras_get_context(adev);
switch (event) {
case IDH_RAS_BAD_PAGES_READY:
xgpu_nv_mailbox_send_ack(adev);
if (amdgpu_sriov_runtime(adev))
schedule_work(&adev->virt.handle_bad_pages_work);
break;
case IDH_RAS_BAD_PAGES_NOTIFICATION:
xgpu_nv_mailbox_send_ack(adev);
if (amdgpu_sriov_runtime(adev))
schedule_work(&adev->virt.bad_pages_work);
schedule_work(&adev->virt.req_bad_pages_work);
break;
case IDH_UNRECOV_ERR_NOTIFICATION:
xgpu_nv_mailbox_send_ack(adev);
@@ -485,7 +505,8 @@ int xgpu_nv_mailbox_get_irq(struct amdgpu_device *adev)
}
INIT_WORK(&adev->virt.flr_work, xgpu_nv_mailbox_flr_work);
INIT_WORK(&adev->virt.bad_pages_work, xgpu_nv_mailbox_bad_pages_work);
INIT_WORK(&adev->virt.req_bad_pages_work, xgpu_nv_mailbox_req_bad_pages_work);
INIT_WORK(&adev->virt.handle_bad_pages_work, xgpu_nv_mailbox_handle_bad_pages_work);
return 0;
}