From 55d7c22192becd0ec827a6901899ff56fa985658 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Christian=20K=C3=B6nig?= Date: Mon, 9 Jul 2012 11:52:44 +0200 Subject: [PATCH] drm/radeon: implement ring saving on reset v4 MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 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.h | 4 ++ drivers/gpu/drm/radeon/radeon_device.c | 48 ++++++++++++++++---- drivers/gpu/drm/radeon/radeon_ring.c | 82 ++++++++++++++++++++++++++++++++++ 3 files changed, 126 insertions(+), 8 deletions(-) diff --git a/drivers/gpu/drm/radeon/radeon.h b/drivers/gpu/drm/radeon/radeon.h index 64d39ad..6715e4c 100644 --- a/drivers/gpu/drm/radeon/radeon.h +++ b/drivers/gpu/drm/radeon/radeon.h @@ -768,6 +768,10 @@ int radeon_ring_test(struct radeon_device *rdev, struct radeon_ring *cp); void radeon_ring_force_activity(struct radeon_device *rdev, struct radeon_ring *ring); void radeon_ring_lockup_update(struct radeon_ring *ring); bool radeon_ring_test_lockup(struct radeon_device *rdev, struct radeon_ring *ring); +unsigned radeon_ring_backup(struct radeon_device *rdev, struct radeon_ring *ring, + uint32_t **data); +int radeon_ring_restore(struct radeon_device *rdev, struct radeon_ring *ring, + unsigned size, uint32_t *data); int radeon_ring_init(struct radeon_device *rdev, struct radeon_ring *cp, unsigned ring_size, unsigned rptr_offs, unsigned rptr_reg, unsigned wptr_reg, u32 ptr_reg_shift, u32 ptr_reg_mask, u32 nop); diff --git a/drivers/gpu/drm/radeon/radeon_device.c b/drivers/gpu/drm/radeon/radeon_device.c index bbd0971..0302a9f 100644 --- a/drivers/gpu/drm/radeon/radeon_device.c +++ b/drivers/gpu/drm/radeon/radeon_device.c @@ -996,7 +996,12 @@ int radeon_resume_kms(struct drm_device *dev) int radeon_gpu_reset(struct radeon_device *rdev) { - int r; + unsigned ring_sizes[RADEON_NUM_RINGS]; + uint32_t *ring_data[RADEON_NUM_RINGS]; + + bool saved = false; + + int i, r; int resched; down_write(&rdev->exclusive_lock); @@ -1005,20 +1010,47 @@ int radeon_gpu_reset(struct radeon_device *rdev) resched = ttm_bo_lock_delayed_workqueue(&rdev->mman.bdev); radeon_suspend(rdev); + for (i = 0; i < RADEON_NUM_RINGS; ++i) { + ring_sizes[i] = radeon_ring_backup(rdev, &rdev->ring[i], + &ring_data[i]); + if (ring_sizes[i]) { + saved = true; + dev_info(rdev->dev, "Saved %d dwords of commands " + "on ring %d.\n", ring_sizes[i], i); + } + } + +retry: r = radeon_asic_reset(rdev); if (!r) { - dev_info(rdev->dev, "GPU reset succeed\n"); + dev_info(rdev->dev, "GPU reset succeeded, trying to resume\n"); radeon_resume(rdev); + } - r = radeon_ib_ring_tests(rdev); - if (r) - DRM_ERROR("ib ring test failed (%d).\n", r); + radeon_restore_bios_scratch_regs(rdev); + drm_helper_resume_force_mode(rdev->ddev); - radeon_restore_bios_scratch_regs(rdev); - drm_helper_resume_force_mode(rdev->ddev); - ttm_bo_unlock_delayed_workqueue(&rdev->mman.bdev, resched); + if (!r) { + for (i = 0; i < RADEON_NUM_RINGS; ++i) { + radeon_ring_restore(rdev, &rdev->ring[i], + ring_sizes[i], ring_data[i]); + } + + r = radeon_ib_ring_tests(rdev); + if (r) { + dev_err(rdev->dev, "ib ring test failed (%d).\n", r); + if (saved) { + radeon_suspend(rdev); + goto retry; + } + } + } else { + for (i = 0; i < RADEON_NUM_RINGS; ++i) { + kfree(ring_data[i]); + } } + ttm_bo_unlock_delayed_workqueue(&rdev->mman.bdev, resched); if (r) { /* bad news, how to tell it to userspace ? */ dev_info(rdev->dev, "GPU reset failed\n"); diff --git a/drivers/gpu/drm/radeon/radeon_ring.c b/drivers/gpu/drm/radeon/radeon_ring.c index ce8eb9d..75cbe46 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) -- 2.7.4