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drm/amdgpu: add debugfs interface for reading MQDs

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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: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Alex Deucher 2023-03-21 13:59:13 -04:00
parent b185c31847
commit 445d85e3c1
1 changed files with 59 additions and 0 deletions
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59
drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c
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@ -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
}