diff options
Diffstat (limited to 'drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c')
-rw-r--r-- | drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c | 561 |
1 files changed, 561 insertions, 0 deletions
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c new file mode 100644 index 000000000000..855e2196657a --- /dev/null +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c @@ -0,0 +1,561 @@ +/* + * Copyright 2008 Advanced Micro Devices, Inc. + * Copyright 2008 Red Hat Inc. + * Copyright 2009 Jerome Glisse. + * + * Permission is hereby granted, free of charge, to any person obtaining a + * copy of this software and associated documentation files (the "Software"), + * to deal in the Software without restriction, including without limitation + * the rights to use, copy, modify, merge, publish, distribute, sublicense, + * and/or sell copies of the Software, and to permit persons to whom the + * Software is furnished to do so, subject to the following conditions: + * + * The above copyright notice and this permission notice shall be included in + * all copies or substantial portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL + * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR + * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, + * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR + * OTHER DEALINGS IN THE SOFTWARE. + * + * Authors: Dave Airlie + * Alex Deucher + * Jerome Glisse + * Christian König + */ +#include <linux/seq_file.h> +#include <linux/slab.h> +#include <drm/drmP.h> +#include <drm/amdgpu_drm.h> +#include "amdgpu.h" +#include "atom.h" + +/* + * Rings + * Most engines on the GPU are fed via ring buffers. Ring + * buffers are areas of GPU accessible memory that the host + * writes commands into and the GPU reads commands out of. + * There is a rptr (read pointer) that determines where the + * GPU is currently reading, and a wptr (write pointer) + * which determines where the host has written. When the + * pointers are equal, the ring is idle. When the host + * writes commands to the ring buffer, it increments the + * wptr. The GPU then starts fetching commands and executes + * them until the pointers are equal again. + */ +static int amdgpu_debugfs_ring_init(struct amdgpu_device *adev, struct amdgpu_ring *ring); + +/** + * amdgpu_ring_free_size - update the free size + * + * @adev: amdgpu_device pointer + * @ring: amdgpu_ring structure holding ring information + * + * Update the free dw slots in the ring buffer (all asics). + */ +void amdgpu_ring_free_size(struct amdgpu_ring *ring) +{ + uint32_t rptr = amdgpu_ring_get_rptr(ring); + + /* This works because ring_size is a power of 2 */ + ring->ring_free_dw = rptr + (ring->ring_size / 4); + ring->ring_free_dw -= ring->wptr; + ring->ring_free_dw &= ring->ptr_mask; + if (!ring->ring_free_dw) { + /* this is an empty ring */ + ring->ring_free_dw = ring->ring_size / 4; + /* update lockup info to avoid false positive */ + amdgpu_ring_lockup_update(ring); + } +} + +/** + * amdgpu_ring_alloc - allocate space on the ring buffer + * + * @adev: amdgpu_device pointer + * @ring: amdgpu_ring structure holding ring information + * @ndw: number of dwords to allocate in the ring buffer + * + * Allocate @ndw dwords in the ring buffer (all asics). + * Returns 0 on success, error on failure. + */ +int amdgpu_ring_alloc(struct amdgpu_ring *ring, unsigned ndw) +{ + int r; + + /* make sure we aren't trying to allocate more space than there is on the ring */ + if (ndw > (ring->ring_size / 4)) + return -ENOMEM; + /* Align requested size with padding so unlock_commit can + * pad safely */ + amdgpu_ring_free_size(ring); + ndw = (ndw + ring->align_mask) & ~ring->align_mask; + while (ndw > (ring->ring_free_dw - 1)) { + amdgpu_ring_free_size(ring); + if (ndw < ring->ring_free_dw) { + break; + } + r = amdgpu_fence_wait_next(ring); + if (r) + return r; + } + ring->count_dw = ndw; + ring->wptr_old = ring->wptr; + return 0; +} + +/** + * amdgpu_ring_lock - lock the ring and allocate space on it + * + * @adev: amdgpu_device pointer + * @ring: amdgpu_ring structure holding ring information + * @ndw: number of dwords to allocate in the ring buffer + * + * Lock the ring and allocate @ndw dwords in the ring buffer + * (all asics). + * Returns 0 on success, error on failure. + */ +int amdgpu_ring_lock(struct amdgpu_ring *ring, unsigned ndw) +{ + int r; + + mutex_lock(ring->ring_lock); + r = amdgpu_ring_alloc(ring, ndw); + if (r) { + mutex_unlock(ring->ring_lock); + return r; + } + return 0; +} + +/** + * amdgpu_ring_commit - tell the GPU to execute the new + * commands on the ring buffer + * + * @adev: amdgpu_device pointer + * @ring: amdgpu_ring structure holding ring information + * + * Update the wptr (write pointer) to tell the GPU to + * execute new commands on the ring buffer (all asics). + */ +void amdgpu_ring_commit(struct amdgpu_ring *ring) +{ + /* We pad to match fetch size */ + while (ring->wptr & ring->align_mask) { + amdgpu_ring_write(ring, ring->nop); + } + mb(); + amdgpu_ring_set_wptr(ring); +} + +/** + * amdgpu_ring_unlock_commit - tell the GPU to execute the new + * commands on the ring buffer and unlock it + * + * @ring: amdgpu_ring structure holding ring information + * + * Call amdgpu_ring_commit() then unlock the ring (all asics). + */ +void amdgpu_ring_unlock_commit(struct amdgpu_ring *ring) +{ + amdgpu_ring_commit(ring); + mutex_unlock(ring->ring_lock); +} + +/** + * amdgpu_ring_undo - reset the wptr + * + * @ring: amdgpu_ring structure holding ring information + * + * Reset the driver's copy of the wptr (all asics). + */ +void amdgpu_ring_undo(struct amdgpu_ring *ring) +{ + ring->wptr = ring->wptr_old; +} + +/** + * amdgpu_ring_unlock_undo - reset the wptr and unlock the ring + * + * @ring: amdgpu_ring structure holding ring information + * + * Call amdgpu_ring_undo() then unlock the ring (all asics). + */ +void amdgpu_ring_unlock_undo(struct amdgpu_ring *ring) +{ + amdgpu_ring_undo(ring); + mutex_unlock(ring->ring_lock); +} + +/** + * amdgpu_ring_lockup_update - update lockup variables + * + * @ring: amdgpu_ring structure holding ring information + * + * Update the last rptr value and timestamp (all asics). + */ +void amdgpu_ring_lockup_update(struct amdgpu_ring *ring) +{ + atomic_set(&ring->last_rptr, amdgpu_ring_get_rptr(ring)); + atomic64_set(&ring->last_activity, jiffies_64); +} + +/** + * amdgpu_ring_test_lockup() - check if ring is lockedup by recording information + * @ring: amdgpu_ring structure holding ring information + * + */ +bool amdgpu_ring_test_lockup(struct amdgpu_ring *ring) +{ + uint32_t rptr = amdgpu_ring_get_rptr(ring); + uint64_t last = atomic64_read(&ring->last_activity); + uint64_t elapsed; + + if (rptr != atomic_read(&ring->last_rptr)) { + /* ring is still working, no lockup */ + amdgpu_ring_lockup_update(ring); + return false; + } + + elapsed = jiffies_to_msecs(jiffies_64 - last); + if (amdgpu_lockup_timeout && elapsed >= amdgpu_lockup_timeout) { + dev_err(ring->adev->dev, "ring %d stalled for more than %llumsec\n", + ring->idx, elapsed); + return true; + } + /* give a chance to the GPU ... */ + return false; +} + +/** + * amdgpu_ring_backup - Back up the content of a ring + * + * @ring: the ring we want to back up + * + * Saves all unprocessed commits from a ring, returns the number of dwords saved. + */ +unsigned amdgpu_ring_backup(struct amdgpu_ring *ring, + uint32_t **data) +{ + unsigned size, ptr, i; + + /* just in case lock the ring */ + mutex_lock(ring->ring_lock); + *data = NULL; + + if (ring->ring_obj == NULL) { + mutex_unlock(ring->ring_lock); + return 0; + } + + /* it doesn't make sense to save anything if all fences are signaled */ + if (!amdgpu_fence_count_emitted(ring)) { + mutex_unlock(ring->ring_lock); + return 0; + } + + ptr = le32_to_cpu(*ring->next_rptr_cpu_addr); + + size = ring->wptr + (ring->ring_size / 4); + size -= ptr; + size &= ring->ptr_mask; + if (size == 0) { + mutex_unlock(ring->ring_lock); + return 0; + } + + /* and then save the content of the ring */ + *data = kmalloc_array(size, sizeof(uint32_t), GFP_KERNEL); + if (!*data) { + mutex_unlock(ring->ring_lock); + return 0; + } + for (i = 0; i < size; ++i) { + (*data)[i] = ring->ring[ptr++]; + ptr &= ring->ptr_mask; + } + + mutex_unlock(ring->ring_lock); + return size; +} + +/** + * amdgpu_ring_restore - append saved commands to the ring again + * + * @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 amdgpu_ring_restore(struct amdgpu_ring *ring, + unsigned size, uint32_t *data) +{ + int i, r; + + if (!size || !data) + return 0; + + /* restore the saved ring content */ + r = amdgpu_ring_lock(ring, size); + if (r) + return r; + + for (i = 0; i < size; ++i) { + amdgpu_ring_write(ring, data[i]); + } + + amdgpu_ring_unlock_commit(ring); + kfree(data); + return 0; +} + +/** + * amdgpu_ring_init - init driver ring struct. + * + * @adev: amdgpu_device pointer + * @ring: amdgpu_ring structure holding ring information + * @ring_size: size of the ring + * @nop: nop packet for this ring + * + * Initialize the driver information for the selected ring (all asics). + * Returns 0 on success, error on failure. + */ +int amdgpu_ring_init(struct amdgpu_device *adev, struct amdgpu_ring *ring, + unsigned ring_size, u32 nop, u32 align_mask, + struct amdgpu_irq_src *irq_src, unsigned irq_type, + enum amdgpu_ring_type ring_type) +{ + u32 rb_bufsz; + int r; + + if (ring->adev == NULL) { + if (adev->num_rings >= AMDGPU_MAX_RINGS) + return -EINVAL; + + ring->adev = adev; + ring->idx = adev->num_rings++; + adev->rings[ring->idx] = ring; + amdgpu_fence_driver_init_ring(ring); + } + + r = amdgpu_wb_get(adev, &ring->rptr_offs); + if (r) { + dev_err(adev->dev, "(%d) ring rptr_offs wb alloc failed\n", r); + return r; + } + + r = amdgpu_wb_get(adev, &ring->wptr_offs); + if (r) { + dev_err(adev->dev, "(%d) ring wptr_offs wb alloc failed\n", r); + return r; + } + + r = amdgpu_wb_get(adev, &ring->fence_offs); + if (r) { + dev_err(adev->dev, "(%d) ring fence_offs wb alloc failed\n", r); + return r; + } + + r = amdgpu_wb_get(adev, &ring->next_rptr_offs); + if (r) { + dev_err(adev->dev, "(%d) ring next_rptr wb alloc failed\n", r); + return r; + } + ring->next_rptr_gpu_addr = adev->wb.gpu_addr + (ring->next_rptr_offs * 4); + ring->next_rptr_cpu_addr = &adev->wb.wb[ring->next_rptr_offs]; + + r = amdgpu_fence_driver_start_ring(ring, irq_src, irq_type); + if (r) { + dev_err(adev->dev, "failed initializing fences (%d).\n", r); + return r; + } + + ring->ring_lock = &adev->ring_lock; + /* Align ring size */ + rb_bufsz = order_base_2(ring_size / 8); + ring_size = (1 << (rb_bufsz + 1)) * 4; + ring->ring_size = ring_size; + ring->align_mask = align_mask; + ring->nop = nop; + ring->type = ring_type; + + /* Allocate ring buffer */ + if (ring->ring_obj == NULL) { + r = amdgpu_bo_create(adev, ring->ring_size, PAGE_SIZE, true, + AMDGPU_GEM_DOMAIN_GTT, 0, + NULL, &ring->ring_obj); + if (r) { + dev_err(adev->dev, "(%d) ring create failed\n", r); + return r; + } + r = amdgpu_bo_reserve(ring->ring_obj, false); + if (unlikely(r != 0)) + return r; + r = amdgpu_bo_pin(ring->ring_obj, AMDGPU_GEM_DOMAIN_GTT, + &ring->gpu_addr); + if (r) { + amdgpu_bo_unreserve(ring->ring_obj); + dev_err(adev->dev, "(%d) ring pin failed\n", r); + return r; + } + r = amdgpu_bo_kmap(ring->ring_obj, + (void **)&ring->ring); + amdgpu_bo_unreserve(ring->ring_obj); + if (r) { + dev_err(adev->dev, "(%d) ring map failed\n", r); + return r; + } + } + ring->ptr_mask = (ring->ring_size / 4) - 1; + ring->ring_free_dw = ring->ring_size / 4; + + if (amdgpu_debugfs_ring_init(adev, ring)) { + DRM_ERROR("Failed to register debugfs file for rings !\n"); + } + amdgpu_ring_lockup_update(ring); + return 0; +} + +/** + * amdgpu_ring_fini - tear down the driver ring struct. + * + * @adev: amdgpu_device pointer + * @ring: amdgpu_ring structure holding ring information + * + * Tear down the driver information for the selected ring (all asics). + */ +void amdgpu_ring_fini(struct amdgpu_ring *ring) +{ + int r; + struct amdgpu_bo *ring_obj; + + if (ring->ring_lock == NULL) + return; + + mutex_lock(ring->ring_lock); + ring_obj = ring->ring_obj; + ring->ready = false; + ring->ring = NULL; + ring->ring_obj = NULL; + mutex_unlock(ring->ring_lock); + + amdgpu_wb_free(ring->adev, ring->fence_offs); + amdgpu_wb_free(ring->adev, ring->rptr_offs); + amdgpu_wb_free(ring->adev, ring->wptr_offs); + amdgpu_wb_free(ring->adev, ring->next_rptr_offs); + + if (ring_obj) { + r = amdgpu_bo_reserve(ring_obj, false); + if (likely(r == 0)) { + amdgpu_bo_kunmap(ring_obj); + amdgpu_bo_unpin(ring_obj); + amdgpu_bo_unreserve(ring_obj); + } + amdgpu_bo_unref(&ring_obj); + } +} + +/* + * Debugfs info + */ +#if defined(CONFIG_DEBUG_FS) + +static int amdgpu_debugfs_ring_info(struct seq_file *m, void *data) +{ + struct drm_info_node *node = (struct drm_info_node *) m->private; + struct drm_device *dev = node->minor->dev; + struct amdgpu_device *adev = dev->dev_private; + int roffset = *(int*)node->info_ent->data; + struct amdgpu_ring *ring = (void *)(((uint8_t*)adev) + roffset); + + uint32_t rptr, wptr, rptr_next; + unsigned count, i, j; + + amdgpu_ring_free_size(ring); + count = (ring->ring_size / 4) - ring->ring_free_dw; + + wptr = amdgpu_ring_get_wptr(ring); + seq_printf(m, "wptr: 0x%08x [%5d]\n", + wptr, wptr); + + rptr = amdgpu_ring_get_rptr(ring); + seq_printf(m, "rptr: 0x%08x [%5d]\n", + rptr, rptr); + + rptr_next = ~0; + + seq_printf(m, "driver's copy of the wptr: 0x%08x [%5d]\n", + ring->wptr, ring->wptr); + seq_printf(m, "last semaphore signal addr : 0x%016llx\n", + ring->last_semaphore_signal_addr); + seq_printf(m, "last semaphore wait addr : 0x%016llx\n", + ring->last_semaphore_wait_addr); + seq_printf(m, "%u free dwords in ring\n", ring->ring_free_dw); + seq_printf(m, "%u dwords in ring\n", count); + + if (!ring->ready) + return 0; + + /* print 8 dw before current rptr as often it's the last executed + * packet that is the root issue + */ + i = (rptr + ring->ptr_mask + 1 - 32) & ring->ptr_mask; + for (j = 0; j <= (count + 32); j++) { + seq_printf(m, "r[%5d]=0x%08x", i, ring->ring[i]); + if (rptr == i) + seq_puts(m, " *"); + if (rptr_next == i) + seq_puts(m, " #"); + seq_puts(m, "\n"); + i = (i + 1) & ring->ptr_mask; + } + return 0; +} + +/* TODO: clean this up !*/ +static int amdgpu_gfx_index = offsetof(struct amdgpu_device, gfx.gfx_ring[0]); +static int cayman_cp1_index = offsetof(struct amdgpu_device, gfx.compute_ring[0]); +static int cayman_cp2_index = offsetof(struct amdgpu_device, gfx.compute_ring[1]); +static int amdgpu_dma1_index = offsetof(struct amdgpu_device, sdma[0].ring); +static int amdgpu_dma2_index = offsetof(struct amdgpu_device, sdma[1].ring); +static int r600_uvd_index = offsetof(struct amdgpu_device, uvd.ring); +static int si_vce1_index = offsetof(struct amdgpu_device, vce.ring[0]); +static int si_vce2_index = offsetof(struct amdgpu_device, vce.ring[1]); + +static struct drm_info_list amdgpu_debugfs_ring_info_list[] = { + {"amdgpu_ring_gfx", amdgpu_debugfs_ring_info, 0, &amdgpu_gfx_index}, + {"amdgpu_ring_cp1", amdgpu_debugfs_ring_info, 0, &cayman_cp1_index}, + {"amdgpu_ring_cp2", amdgpu_debugfs_ring_info, 0, &cayman_cp2_index}, + {"amdgpu_ring_dma1", amdgpu_debugfs_ring_info, 0, &amdgpu_dma1_index}, + {"amdgpu_ring_dma2", amdgpu_debugfs_ring_info, 0, &amdgpu_dma2_index}, + {"amdgpu_ring_uvd", amdgpu_debugfs_ring_info, 0, &r600_uvd_index}, + {"amdgpu_ring_vce1", amdgpu_debugfs_ring_info, 0, &si_vce1_index}, + {"amdgpu_ring_vce2", amdgpu_debugfs_ring_info, 0, &si_vce2_index}, +}; + +#endif + +static int amdgpu_debugfs_ring_init(struct amdgpu_device *adev, struct amdgpu_ring *ring) +{ +#if defined(CONFIG_DEBUG_FS) + unsigned i; + for (i = 0; i < ARRAY_SIZE(amdgpu_debugfs_ring_info_list); ++i) { + struct drm_info_list *info = &amdgpu_debugfs_ring_info_list[i]; + int roffset = *(int*)amdgpu_debugfs_ring_info_list[i].data; + struct amdgpu_ring *other = (void *)(((uint8_t*)adev) + roffset); + unsigned r; + + if (other != ring) + continue; + + r = amdgpu_debugfs_add_files(adev, info, 1); + if (r) + return r; + } +#endif + return 0; +} |