From 55d7c22192becd0ec827a6901899ff56fa985658 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Christian=20K=C3=B6nig?= Date: Mon, 9 Jul 2012 11:52:44 +0200 Subject: drm/radeon: implement ring saving on reset v4 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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 Reviewed-by: Michel Dänzer Reviewed-by: Alex Deucher --- drivers/gpu/drm/radeon/radeon_ring.c | 82 ++++++++++++++++++++++++++++++++++++ 1 file changed, 82 insertions(+) (limited to 'drivers/gpu/drm/radeon/radeon_ring.c') diff --git a/drivers/gpu/drm/radeon/radeon_ring.c b/drivers/gpu/drm/radeon/radeon_ring.c index ce8eb9d5af5..75cbe464113 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) -- cgit v1.2.3