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drm/amdgpu: read CPER ring via debugfs

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We read CPER data from read pointer to write pointer without changing
the pointers.

Signed-off-by: Tao Zhou <tao.zhou1@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Tao Zhou 2025-01-22 16:57:53 +08:00 committed by Alex Deucher
parent 4d614ce8ff
commit 5a14282429
1 changed files with 36 additions and 11 deletions
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47
drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c
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@ -500,6 +500,7 @@ static ssize_t amdgpu_debugfs_ring_read(struct file *f, char __user *buf,
{
struct amdgpu_ring *ring = file_inode(f)->i_private;
uint32_t value, result, early[3];
uint64_t p;
loff_t i;
int r;
@ -523,18 +524,42 @@ static ssize_t amdgpu_debugfs_ring_read(struct file *f, char __user *buf,
}
}
while (size) {
if (*pos >= (ring->ring_size + 12))
return result;
if (ring->funcs->type != AMDGPU_RING_TYPE_CPER) {
while (size) {
if (*pos >= (ring->ring_size + 12))
return result;
value = ring->ring[(*pos - 12)/4];
r = put_user(value, (uint32_t *)buf);
if (r)
return r;
buf += 4;
result += 4;
size -= 4;
*pos += 4;
value = ring->ring[(*pos - 12)/4];
r = put_user(value, (uint32_t *)buf);
if (r)
return r;
buf += 4;
result += 4;
size -= 4;
*pos += 4;
}
} else {
p = early[0];
if (early[0] <= early[1])
size = (early[1] - early[0]);
else
size = ring->ring_size - (early[0] - early[1]);
while (size) {
if (p == early[1])
return result;
value = ring->ring[p];
r = put_user(value, (uint32_t *)buf);
if (r)
return r;
buf += 4;
result += 4;
size--;
p++;
p &= ring->ptr_mask;
}
}
return result;