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drm/amdgpu: Introduce VF critical region check for RAS poison injection

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The SRIOV guest send requet to host to check whether the poison
injection address is in VF critical region or not via mabox.

Signed-off-by: Xiang Liu <xiang.liu@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:
Xiang Liu
2025-08-19 12:51:28 +08:00
committed by Alex Deucher
parent 18f769ff36
commit f1fdeb3d07
5 changed files with 79 additions and 0 deletions
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55
drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c
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@@ -828,11 +828,14 @@ static void amdgpu_virt_init_ras(struct amdgpu_device *adev)
{
ratelimit_state_init(&adev->virt.ras.ras_error_cnt_rs, 5 * HZ, 1);
ratelimit_state_init(&adev->virt.ras.ras_cper_dump_rs, 5 * HZ, 1);
ratelimit_state_init(&adev->virt.ras.ras_chk_criti_rs, 5 * HZ, 1);
ratelimit_set_flags(&adev->virt.ras.ras_error_cnt_rs,
RATELIMIT_MSG_ON_RELEASE);
ratelimit_set_flags(&adev->virt.ras.ras_cper_dump_rs,
RATELIMIT_MSG_ON_RELEASE);
ratelimit_set_flags(&adev->virt.ras.ras_chk_criti_rs,
RATELIMIT_MSG_ON_RELEASE);
mutex_init(&adev->virt.ras.ras_telemetry_mutex);
@@ -1501,3 +1504,55 @@ void amdgpu_virt_request_bad_pages(struct amdgpu_device *adev)
if (virt->ops && virt->ops->req_bad_pages)
virt->ops->req_bad_pages(adev);
}
static int amdgpu_virt_cache_chk_criti_hit(struct amdgpu_device *adev,
struct amdsriov_ras_telemetry *host_telemetry,
bool *hit)
{
struct amd_sriov_ras_chk_criti *tmp = NULL;
uint32_t checksum, used_size;
checksum = host_telemetry->header.checksum;
used_size = host_telemetry->header.used_size;
if (used_size > (AMD_SRIOV_RAS_TELEMETRY_SIZE_KB << 10))
return 0;
tmp = kmemdup(&host_telemetry->body.chk_criti, used_size, GFP_KERNEL);
if (!tmp)
return -ENOMEM;
if (checksum != amd_sriov_msg_checksum(tmp, used_size, 0, 0))
goto out;
if (hit)
*hit = tmp->hit ? true : false;
out:
kfree(tmp);
return 0;
}
int amdgpu_virt_check_vf_critical_region(struct amdgpu_device *adev, u64 addr, bool *hit)
{
struct amdgpu_virt *virt = &adev->virt;
int r = -EPERM;
if (!virt->ops || !virt->ops->req_ras_chk_criti)
return -EOPNOTSUPP;
/* Host allows 15 ras telemetry requests per 60 seconds. Afterwhich, the Host
* will ignore incoming guest messages. Ratelimit the guest messages to
* prevent guest self DOS.
*/
if (__ratelimit(&virt->ras.ras_chk_criti_rs)) {
mutex_lock(&virt->ras.ras_telemetry_mutex);
if (!virt->ops->req_ras_chk_criti(adev, addr))
r = amdgpu_virt_cache_chk_criti_hit(
adev, virt->fw_reserve.ras_telemetry, hit);
mutex_unlock(&virt->ras.ras_telemetry_mutex);
}
return r;
}