drm/amdgpu: add debugfs amdgpu_reset_level

Introduce amdgpu_reset_level debugfs in order to help debug and
test specific type of reset. Also helps blocking unwanted type of
resets.

By default, mode2 reset will not be enabled

v2: make this debugfs in adev and use debugfs_create_u32
Signed-off-by: Victor Zhao <Victor.Zhao@amd.com>
Acked-by: Andrey Grodzovsky <andrey.grodzovsky@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu.h

@@ -274,6 +274,9 @@ extern int amdgpu_vcnfw_log;
 #define AMDGPU_RESET_VCE			(1 << 13)
 #define AMDGPU_RESET_VCE1			(1 << 14)
 
+#define AMDGPU_RESET_LEVEL_SOFT_RECOVERY (1 << 0)
+#define AMDGPU_RESET_LEVEL_MODE2 (1 << 1)
+
 /* max cursor sizes (in pixels) */
 #define CIK_CURSOR_WIDTH 128
 #define CIK_CURSOR_HEIGHT 128
@@ -1060,6 +1063,8 @@ struct amdgpu_device {
 	uint32_t                        scpm_status;
 
 	struct work_struct		reset_work;
+
+	uint32_t						amdgpu_reset_level_mask;
 };
 
 static inline struct amdgpu_device *drm_to_adev(struct drm_device *ddev)

drivers/gpu/drm/amd/amdgpu/amdgpu_debugfs.c

@@ -1786,6 +1786,8 @@ int amdgpu_debugfs_init(struct amdgpu_device *adev)
 		return PTR_ERR(ent);
 	}
 
+	debugfs_create_u32("amdgpu_reset_level", 0600, root, &adev->amdgpu_reset_level_mask);
+
 	/* Register debugfs entries for amdgpu_ttm */
 	amdgpu_ttm_debugfs_init(adev);
 	amdgpu_debugfs_pm_init(adev);

drivers/gpu/drm/amd/amdgpu/amdgpu_reset.c

@@ -37,6 +37,8 @@ int amdgpu_reset_init(struct amdgpu_device *adev)
 {
 	int ret = 0;
 
+	adev->amdgpu_reset_level_mask = 0x1;
+
 	switch (adev->ip_versions[MP1_HWIP][0]) {
 	case IP_VERSION(13, 0, 2):
 		ret = aldebaran_reset_init(adev);
@@ -74,6 +76,9 @@ int amdgpu_reset_prepare_hwcontext(struct amdgpu_device *adev,
 {
 	struct amdgpu_reset_handler *reset_handler = NULL;
 
+	if (!(adev->amdgpu_reset_level_mask & AMDGPU_RESET_LEVEL_MODE2))
+		return -ENOSYS;
+
 	if (test_bit(AMDGPU_SKIP_MODE2_RESET, &reset_context->flags))
 		return -ENOSYS;
 
@@ -93,6 +98,9 @@ int amdgpu_reset_perform_reset(struct amdgpu_device *adev,
 	int ret;
 	struct amdgpu_reset_handler *reset_handler = NULL;
 
+	if (!(adev->amdgpu_reset_level_mask & AMDGPU_RESET_LEVEL_MODE2))
+		return -ENOSYS;
+
 	if (test_bit(AMDGPU_SKIP_MODE2_RESET, &reset_context->flags))
 		return -ENOSYS;
 

drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c

@@ -405,6 +405,9 @@ bool amdgpu_ring_soft_recovery(struct amdgpu_ring *ring, unsigned int vmid,
 {
 	ktime_t deadline = ktime_add_us(ktime_get(), 10000);
 
+	if (!(ring->adev->amdgpu_reset_level_mask & AMDGPU_RESET_LEVEL_SOFT_RECOVERY))
+		return false;
+
 	if (amdgpu_sriov_vf(ring->adev) || !ring->funcs->soft_recovery || !fence)
 		return false;