[PATCH 09/12] drm/amdgpu/sriov:return -ENODEV if gpu reseted

[Monk Liu]

for SRIOV strict mode gpu reset:

In kms open we mark the latest adev->gpu_reset_counter in fpriv
we return -ENODEV in cs_ioctl or info_ioctl if they found
fpriv->gpu_reset_counter != adev->gpu_reset_counter.

this way we prevent a potential bad process/FD from submitting
cmds and notify userspace with -ENODEV.

userspace should close all BO/ctx and re-open
dri FD to re-create virtual memory system for this process

Change-Id: Ib4c179f28a3d0783837566f29de07fc14aa9b9a4
Signed-off-by: Monk Liu <Monk.Liu at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu.h     | 1 +
 drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c  | 5 +++++
 drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c | 7 +++++++
 3 files changed, 13 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
index de9c164..b40d4ba 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -772,6 +772,7 @@ struct amdgpu_fpriv {
 	struct idr		bo_list_handles;
 	struct amdgpu_ctx_mgr	ctx_mgr;
 	u32			vram_lost_counter;
+	int gpu_reset_counter;
 };
 
 /*
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
index 9467cf6..6a1515e 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
@@ -1199,6 +1199,11 @@ int amdgpu_cs_ioctl(struct drm_device *dev, void *data, struct drm_file *filp)
 	if (amdgpu_kms_vram_lost(adev, fpriv))
 		return -ENODEV;
 
+	if (amdgpu_sriov_vf(adev) &&
+		amdgpu_sriov_reset_level == 1 &&
+		fpriv->gpu_reset_counter < atomic_read(&adev->gpu_reset_counter))
+		return -ENODEV;
+
 	parser.adev = adev;
 	parser.filp = filp;
 
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
index 282f45b..bd389cf 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
@@ -285,6 +285,11 @@ static int amdgpu_info_ioctl(struct drm_device *dev, void *data, struct drm_file
 	if (amdgpu_kms_vram_lost(adev, fpriv))
 		return -ENODEV;
 
+	if (amdgpu_sriov_vf(adev) &&
+		amdgpu_sriov_reset_level == 1 &&
+		fpriv->gpu_reset_counter < atomic_read(&adev->gpu_reset_counter))
+		return -ENODEV;
+
 	switch (info->query) {
 	case AMDGPU_INFO_ACCEL_WORKING:
 		ui32 = adev->accel_working;
@@ -824,6 +829,8 @@ int amdgpu_driver_open_kms(struct drm_device *dev, struct drm_file *file_priv)
 		goto out_suspend;
 	}
 
+	fpriv->gpu_reset_counter = atomic_read(&adev->gpu_reset_counter);
+
 	r = amdgpu_vm_init(adev, &fpriv->vm,
 			   AMDGPU_VM_CONTEXT_GFX, 0);
 	if (r) {
-- 
2.7.4