[PATCH 4/5 V2] drm/amdgpu: Add sysfs interface for vpe reset mask

[Jesse.zhang@amd.com]

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)

Signed-off-by: Jesse Zhang <Jesse.Zhang at amd.com>
Suggested-by:Alex Deucher <alexander.deucher at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_vpe.c | 53 +++++++++++++++++++++++++
 drivers/gpu/drm/amd/amdgpu/amdgpu_vpe.h |  2 +
 2 files changed, 55 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vpe.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vpe.c
index 6d96e1f21e20..eae94fdb126e 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vpe.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vpe.c
@@ -377,6 +377,10 @@ static int vpe_sw_init(struct amdgpu_ip_block *ip_block)
 	ret = vpe_init_microcode(vpe);
 	if (ret)
 		goto out;
+
+	ret = amdgpu_vpe_sysfs_reset_mask_init(adev);
+	if (ret)
+		goto out;
 out:
 	return ret;
 }
@@ -389,6 +393,7 @@ static int vpe_sw_fini(struct amdgpu_ip_block *ip_block)
 	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,
@@ -865,6 +870,54 @@ static void vpe_ring_end_use(struct amdgpu_ring *ring)
 	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);
+	ssize_t size = 0;
+	struct amdgpu_ring *ring = &adev->vpe.ring;
+
+	if (!adev || !ring)
+		return -ENODEV;
+
+	if (amdgpu_device_should_recover_gpu(adev))
+		size += sysfs_emit_at(buf, size, "full ");
+
+	if (amdgpu_gpu_recovery && unlikely(!adev->debug_disable_soft_recovery)
+			&& !amdgpu_sriov_vf(adev) && ring->funcs->soft_recovery)
+		size += sysfs_emit_at(buf, size, "soft ");
+
+	if (amdgpu_gpu_recovery && ring->funcs->reset)
+		size += sysfs_emit_at(buf, size, "queue ");
+
+	size += sysfs_emit_at(buf, size, "\n");
+	return size;
+}
+
+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 = {
 	.type = AMDGPU_RING_TYPE_VPE,
 	.align_mask = 0xf,
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vpe.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_vpe.h
index 231d86d0953e..015ba7aaf0ca 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vpe.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vpe.h
@@ -86,6 +86,8 @@ int amdgpu_vpe_init_microcode(struct amdgpu_vpe *vpe);
 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)
-- 
2.25.1