Commit 445d85e3 authored by Alex Deucher's avatar Alex Deucher
Browse files

drm/amdgpu: add debugfs interface for reading MQDs 



Provide a debugfs interface to access the MQD.  Useful for
debugging issues with the CP and MES hardware scheduler.

v2: fix missing unreserve/unmap when pos >= size (Alex)

Reviewed-by: default avatarChristian König <christian.koenig@amd.com>
Signed-off-by: default avatarAlex Deucher <alexander.deucher@amd.com>
parent b185c318

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

+59 −0
Original line number Diff line number Diff line
@@ -509,6 +509,59 @@ static const struct file_operations amdgpu_debugfs_ring_fops = { 
	.llseek = default_llseek

};



static ssize_t amdgpu_debugfs_mqd_read(struct file *f, char __user *buf,

				       size_t size, loff_t *pos)

{

	struct amdgpu_ring *ring = file_inode(f)->i_private;

	volatile u32 *mqd;

	int r;

	uint32_t value, result;



	if (*pos & 3 || size & 3)

		return -EINVAL;



	result = 0;



	r = amdgpu_bo_reserve(ring->mqd_obj, false);

	if (unlikely(r != 0))

		return r;



	r = amdgpu_bo_kmap(ring->mqd_obj, (void **)&mqd);

	if (r) {

		amdgpu_bo_unreserve(ring->mqd_obj);

		return r;

	}



	while (size) {

		if (*pos >= ring->mqd_size)

			goto done;



		value = mqd[*pos/4];

		r = put_user(value, (uint32_t *)buf);

		if (r)

			goto done;

		buf += 4;

		result += 4;

		size -= 4;

		*pos += 4;

	}



done:

	amdgpu_bo_kunmap(ring->mqd_obj);

	mqd = NULL;

	amdgpu_bo_unreserve(ring->mqd_obj);

	if (r)

		return r;



	return result;

}



static const struct file_operations amdgpu_debugfs_mqd_fops = {

	.owner = THIS_MODULE,

	.read = amdgpu_debugfs_mqd_read,

	.llseek = default_llseek

};



#endif



void amdgpu_debugfs_ring_init(struct amdgpu_device *adev,
@@ -524,6 +577,12 @@ void amdgpu_debugfs_ring_init(struct amdgpu_device *adev, 
				 &amdgpu_debugfs_ring_fops,

				 ring->ring_size + 12);



	if (ring->mqd_obj) {

		sprintf(name, "amdgpu_mqd_%s", ring->name);

		debugfs_create_file_size(name, S_IFREG | S_IRUGO, root, ring,

					 &amdgpu_debugfs_mqd_fops,

					 ring->mqd_size);

	}

#endif

}