Am 29.03.2017 um 19:07 schrieb Tom St Denis:
On 29/03/17 01:07 PM, Tom St Denis wrote:
On gfx9 hardware the value is not wrapped and is a 64-bit value. So
we reduce it modulo the ring size.
Signed-off-by: Tom St Denis <tom.stde...@amd.com>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c
b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c
index ac0ce3f27f87..b6d2c0b2a501 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c
@@ -320,8 +320,8 @@ static ssize_t amdgpu_debugfs_ring_read(struct
file *f, char __user *buf,
if (*pos < 12) {
early[0] = amdgpu_ring_get_rptr(ring);
- early[1] = amdgpu_ring_get_wptr(ring);
- early[2] = ring->wptr;
+ early[1] = amdgpu_ring_get_wptr(ring) & ((ring->ring_size >>
2) - 1);
+ early[2] = ring->wptr & ((ring->ring_size >> 2) - 1);
for (i = *pos / 4; i < 3 && size; i++) {
r = put_user(early[i], (uint32_t *)buf);
if (r)
Particularly if reviewers could make sure I got the dword/byte
conversion correct here. It's my understanding ring_size is bytes and
the get_*ptr() macros is in dwords right?
Actually you should use ptr_mask here instead, this way you don't need
to mess with the ring size at all.
Regards,
Christian.
Tom
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