/* * Copyright 2011 Christian König. * All Rights Reserved. * * 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, sub license, 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 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 NON-INFRINGEMENT. IN NO EVENT SHALL * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS 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. * * The above copyright notice and this permission notice (including the * next paragraph) shall be included in all copies or substantial portions * of the Software. * */ /* * Authors: * Christian König <deathsimple@vodafone.de> */ #include <drm/drmP.h> #include "radeon.h" #include "radeon_trace.h" int radeon_semaphore_create(struct radeon_device *rdev, struct radeon_semaphore **semaphore) { uint32_t *cpu_addr; int i, r; *semaphore = kmalloc(sizeof(struct radeon_semaphore), GFP_KERNEL); if (*semaphore == NULL) { return -ENOMEM; } r = radeon_sa_bo_new(rdev, &rdev->ring_tmp_bo, &(*semaphore)->sa_bo, 8 * RADEON_NUM_SYNCS, 8); if (r) { kfree(*semaphore); *semaphore = NULL; return r; } (*semaphore)->waiters = 0; (*semaphore)->gpu_addr = radeon_sa_bo_gpu_addr((*semaphore)->sa_bo); cpu_addr = radeon_sa_bo_cpu_addr((*semaphore)->sa_bo); for (i = 0; i < RADEON_NUM_SYNCS; ++i) cpu_addr[i] = 0; for (i = 0; i < RADEON_NUM_RINGS; ++i) (*semaphore)->sync_to[i] = NULL; return 0; } bool radeon_semaphore_emit_signal(struct radeon_device *rdev, int ridx, struct radeon_semaphore *semaphore) { struct radeon_ring *ring = &rdev->ring[ridx]; trace_radeon_semaphore_signale(ridx, semaphore); if (radeon_semaphore_ring_emit(rdev, ridx, ring, semaphore, false)) { --semaphore->waiters; /* for debugging lockup only, used by sysfs debug files */ ring->last_semaphore_signal_addr = semaphore->gpu_addr; return true; } return false; } bool radeon_semaphore_emit_wait(struct radeon_device *rdev, int ridx, struct radeon_semaphore *semaphore) { struct radeon_ring *ring = &rdev->ring[ridx]; trace_radeon_semaphore_wait(ridx, semaphore); if (radeon_semaphore_ring_emit(rdev, ridx, ring, semaphore, true)) { ++semaphore->waiters; /* for debugging lockup only, used by sysfs debug files */ ring->last_semaphore_wait_addr = semaphore->gpu_addr; return true; } return false; } /** * radeon_semaphore_sync_to - use the semaphore to sync to a fence * * @semaphore: semaphore object to add fence to * @fence: fence to sync to * * Sync to the fence using this semaphore object */ void radeon_semaphore_sync_to(struct radeon_semaphore *semaphore, struct radeon_fence *fence) { struct radeon_fence *other; if (!fence) return; other = semaphore->sync_to[fence->ring]; semaphore->sync_to[fence->ring] = radeon_fence_later(fence, other); } /** * radeon_semaphore_sync_rings - sync ring to all registered fences * * @rdev: radeon_device pointer * @semaphore: semaphore object to use for sync * @ring: ring that needs sync * * Ensure that all registered fences are signaled before letting * the ring continue. The caller must hold the ring lock. */ int radeon_semaphore_sync_rings(struct radeon_device *rdev, struct radeon_semaphore *semaphore, int ring) { unsigned count = 0; int i, r; for (i = 0; i < RADEON_NUM_RINGS; ++i) { struct radeon_fence *fence = semaphore->sync_to[i]; /* check if we really need to sync */ if (!radeon_fence_need_sync(fence, ring)) continue; /* prevent GPU deadlocks */ if (!rdev->ring[i].ready) { dev_err(rdev->dev, "Syncing to a disabled ring!"); return -EINVAL; } if (++count > RADEON_NUM_SYNCS) { /* not enough room, wait manually */ r = radeon_fence_wait(fence, false); if (r) return r; continue; } /* allocate enough space for sync command */ r = radeon_ring_alloc(rdev, &rdev->ring[i], 16); if (r) { return r; } /* emit the signal semaphore */ if (!radeon_semaphore_emit_signal(rdev, i, semaphore)) { /* signaling wasn't successful wait manually */ radeon_ring_undo(&rdev->ring[i]); r = radeon_fence_wait(fence, false); if (r) return r; continue; } /* we assume caller has already allocated space on waiters ring */ if (!radeon_semaphore_emit_wait(rdev, ring, semaphore)) { /* waiting wasn't successful wait manually */ radeon_ring_undo(&rdev->ring[i]); r = radeon_fence_wait(fence, false); if (r) return r; continue; } radeon_ring_commit(rdev, &rdev->ring[i]); radeon_fence_note_sync(fence, ring); semaphore->gpu_addr += 8; } return 0; } void radeon_semaphore_free(struct radeon_device *rdev, struct radeon_semaphore **semaphore, struct radeon_fence *fence) { if (semaphore == NULL || *semaphore == NULL) { return; } if ((*semaphore)->waiters > 0) { dev_err(rdev->dev, "semaphore %p has more waiters than signalers," " hardware lockup imminent!\n", *semaphore); } radeon_sa_bo_free(rdev, &(*semaphore)->sa_bo, fence); kfree(*semaphore); *semaphore = NULL; }