summaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/radeon/radeon_ring.c
diff options
context:
space:
mode:
authorChristian König <deathsimple@vodafone.de>2012-07-09 13:52:44 +0400
committerChristian König <deathsimple@vodafone.de>2012-07-17 12:33:15 +0400
commit55d7c22192becd0ec827a6901899ff56fa985658 (patch)
tree2876d95b10e9bac71ef168dd998537c731d3222f /drivers/gpu/drm/radeon/radeon_ring.c
parent45df68035c4964d42ea3850980708ce8674f75b3 (diff)
downloadlinux-55d7c22192becd0ec827a6901899ff56fa985658.tar.xz
drm/radeon: implement ring saving on reset v4
Try to save whatever is on the rings when we encounter an lockup. v2: Fix spelling error. Free saved ring data if reset fails. Add documentation for the new functions. v3: Some more spelling fixes v4: It doesn't make sense to save anything if all fences are signaled Signed-off-by: Christian König <deathsimple@vodafone.de> Reviewed-by: Michel Dänzer <michel.daenzer@amd.com> Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Diffstat (limited to 'drivers/gpu/drm/radeon/radeon_ring.c')
-rw-r--r--drivers/gpu/drm/radeon/radeon_ring.c82
1 files changed, 82 insertions, 0 deletions
diff --git a/drivers/gpu/drm/radeon/radeon_ring.c b/drivers/gpu/drm/radeon/radeon_ring.c
index ce8eb9d5af5d..75cbe4641138 100644
--- a/drivers/gpu/drm/radeon/radeon_ring.c
+++ b/drivers/gpu/drm/radeon/radeon_ring.c
@@ -362,6 +362,88 @@ bool radeon_ring_test_lockup(struct radeon_device *rdev, struct radeon_ring *rin
return false;
}
+/**
+ * radeon_ring_backup - Back up the content of a ring
+ *
+ * @rdev: radeon_device pointer
+ * @ring: the ring we want to back up
+ *
+ * Saves all unprocessed commits from a ring, returns the number of dwords saved.
+ */
+unsigned radeon_ring_backup(struct radeon_device *rdev, struct radeon_ring *ring,
+ uint32_t **data)
+{
+ unsigned size, ptr, i;
+ int ridx = radeon_ring_index(rdev, ring);
+
+ /* just in case lock the ring */
+ mutex_lock(&rdev->ring_lock);
+ *data = NULL;
+
+ if (ring->ring_obj == NULL || !ring->rptr_save_reg) {
+ mutex_unlock(&rdev->ring_lock);
+ return 0;
+ }
+
+ /* it doesn't make sense to save anything if all fences are signaled */
+ if (!radeon_fence_count_emitted(rdev, ridx)) {
+ mutex_unlock(&rdev->ring_lock);
+ return 0;
+ }
+
+ /* calculate the number of dw on the ring */
+ ptr = RREG32(ring->rptr_save_reg);
+ size = ring->wptr + (ring->ring_size / 4);
+ size -= ptr;
+ size &= ring->ptr_mask;
+ if (size == 0) {
+ mutex_unlock(&rdev->ring_lock);
+ return 0;
+ }
+
+ /* and then save the content of the ring */
+ *data = kmalloc(size * 4, GFP_KERNEL);
+ for (i = 0; i < size; ++i) {
+ (*data)[i] = ring->ring[ptr++];
+ ptr &= ring->ptr_mask;
+ }
+
+ mutex_unlock(&rdev->ring_lock);
+ return size;
+}
+
+/**
+ * radeon_ring_restore - append saved commands to the ring again
+ *
+ * @rdev: radeon_device pointer
+ * @ring: ring to append commands to
+ * @size: number of dwords we want to write
+ * @data: saved commands
+ *
+ * Allocates space on the ring and restore the previously saved commands.
+ */
+int radeon_ring_restore(struct radeon_device *rdev, struct radeon_ring *ring,
+ unsigned size, uint32_t *data)
+{
+ int i, r;
+
+ if (!size || !data)
+ return 0;
+
+ /* restore the saved ring content */
+ r = radeon_ring_lock(rdev, ring, size);
+ if (r)
+ return r;
+
+ for (i = 0; i < size; ++i) {
+ radeon_ring_write(ring, data[i]);
+ }
+
+ radeon_ring_unlock_commit(rdev, ring);
+ kfree(data);
+ return 0;
+}
+
int radeon_ring_init(struct radeon_device *rdev, struct radeon_ring *ring, unsigned ring_size,
unsigned rptr_offs, unsigned rptr_reg, unsigned wptr_reg,
u32 ptr_reg_shift, u32 ptr_reg_mask, u32 nop)