drm/amdgpu: Add sysfs interface for vpe reset mask

Add the sysfs interface for vpe:
vpe_reset_mask

The interface is read-only and show the resets supported by the IP.
For example, full adapter reset (mode1/mode2/BACO/etc),
soft reset, queue reset, and pipe reset.

V2: the sysfs node returns a text string instead of some flags (Christian)
v3: add a generic helper which takes the ring as parameter
and print the strings in the order they are applied (Christian)

check amdgpu_gpu_recovery before creating sysfs file itself,
and initialize supported_reset_types in IP version files (Lijo)

Signed-off-by: Jesse Zhang <[e-mail]>
Suggested-by: Alex Deucher <[e-mail]>
Reviewed-by: Tim Huang <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

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

···
 	ret = vpe_init_microcode(vpe);
 	if (ret)
 		goto out;
+
+	/* TODO: Add queue reset mask when FW fully supports it */
+	adev->vpe.supported_reset =
+		 amdgpu_get_soft_full_reset_mask(&adev->vpe.ring);
+	ret = amdgpu_vpe_sysfs_reset_mask_init(adev);
+	if (ret)
+		goto out;
 out:
 	return ret;
 }
···
 	release_firmware(vpe->fw);
 	vpe->fw = NULL;
 
+	amdgpu_vpe_sysfs_reset_mask_fini(adev);
 	vpe_ring_fini(vpe);
 
 	amdgpu_bo_free_kernel(&adev->vpe.cmdbuf_obj,
···
 	struct amdgpu_device *adev = ring->adev;
 
 	schedule_delayed_work(&adev->vpe.idle_work, VPE_IDLE_TIMEOUT);
+}
+
+static ssize_t amdgpu_get_vpe_reset_mask(struct device *dev,
+						struct device_attribute *attr,
+						char *buf)
+{
+	struct drm_device *ddev = dev_get_drvdata(dev);
+	struct amdgpu_device *adev = drm_to_adev(ddev);
+
+	if (!adev)
+		return -ENODEV;
+
+	return amdgpu_show_reset_mask(buf, adev->vpe.supported_reset);
+}
+
+static DEVICE_ATTR(vpe_reset_mask, 0444,
+		   amdgpu_get_vpe_reset_mask, NULL);
+
+int amdgpu_vpe_sysfs_reset_mask_init(struct amdgpu_device *adev)
+{
+	int r = 0;
+
+	if (adev->vpe.num_instances) {
+		r = device_create_file(adev->dev, &dev_attr_vpe_reset_mask);
+		if (r)
+			return r;
+	}
+
+	return r;
+}
+
+void amdgpu_vpe_sysfs_reset_mask_fini(struct amdgpu_device *adev)
+{
+	if (adev->vpe.num_instances)
+		device_remove_file(adev->dev, &dev_attr_vpe_reset_mask);
 }
 
 static const struct amdgpu_ring_funcs vpe_ring_funcs = {

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

···
 
 	uint32_t			num_instances;
 	bool				collaborate_mode;
+	uint32_t			supported_reset;
 };
 
 int amdgpu_vpe_psp_update_sram(struct amdgpu_device *adev);
···
 int amdgpu_vpe_ring_init(struct amdgpu_vpe *vpe);
 int amdgpu_vpe_ring_fini(struct amdgpu_vpe *vpe);
 int amdgpu_vpe_configure_dpm(struct amdgpu_vpe *vpe);
+void amdgpu_vpe_sysfs_reset_mask_fini(struct amdgpu_device *adev);
+int amdgpu_vpe_sysfs_reset_mask_init(struct amdgpu_device *adev);
 
 #define vpe_ring_init(vpe) ((vpe)->funcs->ring_init ? (vpe)->funcs->ring_init((vpe)) : 0)
 #define vpe_ring_start(vpe) ((vpe)->funcs->ring_start ? (vpe)->funcs->ring_start((vpe)) : 0)