/* * Copyright 2009 Jerome Glisse. * 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: * Jerome Glisse * Dave Airlie */ #include #include #include #include #include #include #include #include "radeon_reg.h" #include "radeon.h" #include "radeon_trace.h" /* * Fences * Fences mark an event in the GPUs pipeline and are used * for GPU/CPU synchronization. When the fence is written, * it is expected that all buffers associated with that fence * are no longer in use by the associated ring on the GPU and * that the the relevant GPU caches have been flushed. Whether * we use a scratch register or memory location depends on the asic * and whether writeback is enabled. */ /** * radeon_fence_write - write a fence value * * @rdev: radeon_device pointer * @seq: sequence number to write * @ring: ring index the fence is associated with * * Writes a fence value to memory or a scratch register (all asics). */ static void radeon_fence_write(struct radeon_device *rdev, u32 seq, int ring) { struct radeon_fence_driver *drv = &rdev->fence_drv[ring]; if (likely(rdev->wb.enabled || !drv->scratch_reg)) { if (drv->cpu_addr) { *drv->cpu_addr = cpu_to_le32(seq); } } else { WREG32(drv->scratch_reg, seq); } } /** * radeon_fence_read - read a fence value * * @rdev: radeon_device pointer * @ring: ring index the fence is associated with * * Reads a fence value from memory or a scratch register (all asics). * Returns the value of the fence read from memory or register. */ static u32 radeon_fence_read(struct radeon_device *rdev, int ring) { struct radeon_fence_driver *drv = &rdev->fence_drv[ring]; u32 seq = 0; if (likely(rdev->wb.enabled || !drv->scratch_reg)) { if (drv->cpu_addr) { seq = le32_to_cpu(*drv->cpu_addr); } else { seq = lower_32_bits(atomic64_read(&drv->last_seq)); } } else { seq = RREG32(drv->scratch_reg); } return seq; } /** * radeon_fence_schedule_check - schedule lockup check * * @rdev: radeon_device pointer * @ring: ring index we should work with * * Queues a delayed work item to check for lockups. */ static void radeon_fence_schedule_check(struct radeon_device *rdev, int ring) { /* * Do not reset the timer here with mod_delayed_work, * this can livelock in an interaction with TTM delayed destroy. */ queue_delayed_work(system_power_efficient_wq, &rdev->fence_drv[ring].lockup_work, RADEON_FENCE_JIFFIES_TIMEOUT); } /** * radeon_fence_emit - emit a fence on the requested ring * * @rdev: radeon_device pointer * @fence: radeon fence object * @ring: ring index the fence is associated with * * Emits a fence command on the requested ring (all asics). * Returns 0 on success, -ENOMEM on failure. */ int radeon_fence_emit(struct radeon_device *rdev, struct radeon_fence **fence, int ring) { u64 seq = ++rdev->fence_drv[ring].sync_seq[ring]; /* we are protected by the ring emission mutex */ *fence = kmalloc(sizeof(struct radeon_fence), GFP_KERNEL); if ((*fence) == NULL) { return -ENOMEM; } (*fence)->rdev = rdev; (*fence)->seq = seq; (*fence)->ring = ring; (*fence)->is_vm_update = false; fence_init(&(*fence)->base, &radeon_fence_ops, &rdev->fence_queue.lock, rdev->fence_context + ring, seq); radeon_fence_ring_emit(rdev, ring, *fence); trace_radeon_fence_emit(rdev->ddev, ring, (*fence)->seq); radeon_fence_schedule_check(rdev, ring); return 0; } /** * radeon_fence_check_signaled - callback from fence_queue * * this function is called with fence_queue lock held, which is also used * for the fence locking itself, so unlocked variants are used for * fence_signal, and remove_wait_queue. */ static int radeon_fence_check_signaled(wait_queue_t *wait, unsigned mode, int flags, void *key) { struct radeon_fence *fence; u64 seq; fence = container_of(wait, struct radeon_fence, fence_wake); /* * We cannot use radeon_fence_process here because we're already * in the waitqueue, in a call from wake_up_all. */ seq = atomic64_read(&fence->rdev->fence_drv[fence->ring].last_seq); if (seq >= fence->seq) { int ret = fence_signal_locked(&fence->base); if (!ret) FENCE_TRACE(&fence->base, "signaled from irq context\n"); else FENCE_TRACE(&fence->base, "was already signaled\n"); radeon_irq_kms_sw_irq_put(fence->rdev, fence->ring); __remove_wait_queue(&fence->rdev->fence_queue, &fence->fence_wake); fence_put(&fence->base); } else FENCE_TRACE(&fence->base, "pending\n"); return 0; } /** * radeon_fence_activity - check for fence activity * * @rdev: radeon_device pointer * @ring: ring index the fence is associated with * * Checks the current fence value and calculates the last * signalled fence value. Returns true if activity occured * on the ring, and the fence_queue should be waken up. */ static bool radeon_fence_activity(struct radeon_device *rdev, int ring) { uint64_t seq, last_seq, last_emitted; unsigned count_loop = 0; bool wake = false; /* Note there is a scenario here for an infinite loop but it's * very unlikely to happen. For it to happen, the current polling * process need to be interrupted by another process and another * process needs to update the last_seq btw the atomic read and * xchg of the current process. * * More over for this to go in infinite loop there need to be * continuously new fence signaled ie radeon_fence_read needs * to return a different value each time for both the currently * polling process and the other process that xchg the last_seq * btw atomic read and xchg of the current process. And the * value the other process set as last seq must be higher than * the seq value we just read. Which means that current process * need to be interrupted after radeon_fence_read and before * atomic xchg. * * To be even more safe we count the number of time we loop and * we bail after 10 loop just accepting the fact that we might * have temporarly set the last_seq not to the true real last * seq but to an older one. */ last_seq = atomic64_read(&rdev->fence_drv[ring].last_seq); do { last_emitted = rdev->fence_drv[ring].sync_seq[ring]; seq = radeon_fence_read(rdev, ring); seq |= last_seq & 0xffffffff00000000LL; if (seq < last_seq) { seq &= 0xffffffff; seq |= last_emitted & 0xffffffff00000000LL; } if (seq <= last_seq || seq > last_emitted) { break; } /* If we loop over we don't want to return without * checking if a fence is signaled as it means that the * seq we just read is different from the previous on. */ wake = true; last_seq = seq; if ((count_loop++) > 10) { /* We looped over too many time leave with the * fact that we might have set an older fence * seq then the current real last seq as signaled * by the hw. */ break; } } while (atomic64_xchg(&rdev->fence_drv[ring].last_seq, seq) > seq); if (seq < last_emitted) radeon_fence_schedule_check(rdev, ring); return wake; } /** * radeon_fence_check_lockup - check for hardware lockup * * @work: delayed work item * * Checks for fence activity and if there is none probe * the hardware if a lockup occured. */ static void radeon_fence_check_lockup(struct work_struct *work) { struct radeon_fence_driver *fence_drv; struct radeon_device *rdev; int ring; fence_drv = container_of(work, struct radeon_fence_driver, lockup_work.work); rdev = fence_drv->rdev; ring = fence_drv - &rdev->fence_drv[0]; if (!down_read_trylock(&rdev->exclusive_lock)) { /* just reschedule the check if a reset is going on */ radeon_fence_schedule_check(rdev, ring); return; } if (fence_drv->delayed_irq && rdev->ddev->irq_enabled) { unsigned long irqflags; fence_drv->delayed_irq = false; spin_lock_irqsave(&rdev->irq.lock, irqflags); radeon_irq_set(rdev); spin_unlock_irqrestore(&rdev->irq.lock, irqflags); } if (radeon_fence_activity(rdev, ring)) wake_up_all(&rdev->fence_queue); else if (radeon_ring_is_lockup(rdev, ring, &rdev->ring[ring])) { /* good news we believe it's a lockup */ dev_warn(rdev->dev, "GPU lockup (current fence id " "0x%016llx last fence id 0x%016llx on ring %d)\n", (uint64_t)atomic64_read(&fence_drv->last_seq), fence_drv->sync_seq[ring], ring); /* remember that we need an reset */ rdev->needs_reset = true; wake_up_all(&rdev->fence_queue); } up_read(&rdev->exclusive_lock); } /** * radeon_fence_process - process a fence * * @rdev: radeon_device pointer * @ring: ring index the fence is associated with * * Checks the current fence value and wakes the fence queue * if the sequence number has increased (all asics). */ void radeon_fence_process(struct radeon_device *rdev, int ring) { if (radeon_fence_activity(rdev, ring)) wake_up_all(&rdev->fence_queue); } /** * radeon_fence_seq_signaled - check if a fence sequence number has signaled * * @rdev: radeon device pointer * @seq: sequence number * @ring: ring index the fence is associated with * * Check if the last signaled fence sequnce number is >= the requested * sequence number (all asics). * Returns true if the fence has signaled (current fence value * is >= requested value) or false if it has not (current fence * value is < the requested value. Helper function for * radeon_fence_signaled(). */ static bool radeon_fence_seq_signaled(struct radeon_device *rdev, u64 seq, unsigned ring) { if (atomic64_read(&rdev->fence_drv[ring].last_seq) >= seq) { return true; } /* poll new last sequence at least once */ radeon_fence_process(rdev, ring); if (atomic64_read(&rdev->fence_drv[ring].last_seq) >= seq) { return true; } return false; } static bool radeon_fence_is_signaled(struct fence *f) { struct radeon_fence *fence = to_radeon_fence(f); struct radeon_device *rdev = fence->rdev; unsigned ring = fence->ring; u64 seq = fence->seq; if (atomic64_read(&rdev->fence_drv[ring].last_seq) >= seq) { return true; } if (down_read_trylock(&rdev->exclusive_lock)) { radeon_fence_process(rdev, ring); up_read(&rdev->exclusive_lock); if (atomic64_read(&rdev->fence_drv[ring].last_seq) >= seq) { return true; } } return false; } /** * radeon_fence_enable_signaling - enable signalling on fence * @fence: fence * * This function is called with fence_queue lock held, and adds a callback * to fence_queue that checks if this fence is signaled, and if so it * signals the fence and removes itself. */ static bool radeon_fence_enable_signaling(struct fence *f) { struct radeon_fence *fence = to_radeon_fence(f); struct radeon_device *rdev = fence->rdev; if (atomic64_read(&rdev->fence_drv[fence->ring].last_seq) >= fence->seq) return false; if (down_read_trylock(&rdev->exclusive_lock)) { radeon_irq_kms_sw_irq_get(rdev, fence->ring); if (radeon_fence_activity(rdev, fence->ring)) wake_up_all_locked(&rdev->fence_queue); /* did fence get signaled after we enabled the sw irq? */ if (atomic64_read(&rdev->fence_drv[fence->ring].last_seq) >= fence->seq) { radeon_irq_kms_sw_irq_put(rdev, fence->ring); up_read(&rdev->exclusive_lock); return false; } up_read(&rdev->exclusive_lock); } else { /* we're probably in a lockup, lets not fiddle too much */ if (radeon_irq_kms_sw_irq_get_delayed(rdev, fence->ring)) rdev->fence_drv[fence->ring].delayed_irq = true; radeon_fence_schedule_check(rdev, fence->ring); } fence->fence_wake.flags = 0; fence->fence_wake.private = NULL; fence->fence_wake.func = radeon_fence_check_signaled; __add_wait_queue(&rdev->fence_queue, &fence->fence_wake); fence_get(f); FENCE_TRACE(&fence->base, "armed on ring %i!\n", fence->ring); return true; } /** * radeon_fence_signaled - check if a fence has signaled * * @fence: radeon fence object * * Check if the requested fence has signaled (all asics). * Returns true if the fence has signaled or false if it has not. */ bool radeon_fence_signaled(struct radeon_fence *fence) { if (!fence) return true; if (radeon_fence_seq_signaled(fence->rdev, fence->seq, fence->ring)) { int ret; ret = fence_signal(&fence->base); if (!ret) FENCE_TRACE(&fence->base, "signaled from radeon_fence_signaled\n"); return true; } return false; } /** * radeon_fence_any_seq_signaled - check if any sequence number is signaled * * @rdev: radeon device pointer * @seq: sequence numbers * * Check if the last signaled fence sequnce number is >= the requested * sequence number (all asics). * Returns true if any has signaled (current value is >= requested value) * or false if it has not. Helper function for radeon_fence_wait_seq. */ static bool radeon_fence_any_seq_signaled(struct radeon_device *rdev, u64 *seq) { unsigned i; for (i = 0; i < RADEON_NUM_RINGS; ++i) { if (seq[i] && radeon_fence_seq_signaled(rdev, seq[i], i)) return true; } return false; } /** * radeon_fence_wait_seq_timeout - wait for a specific sequence numbers * * @rdev: radeon device pointer * @target_seq: sequence number(s) we want to wait for * @intr: use interruptable sleep * @timeout: maximum time to wait, or MAX_SCHEDULE_TIMEOUT for infinite wait * * Wait for the requested sequence number(s) to be written by any ring * (all asics). Sequnce number array is indexed by ring id. * @intr selects whether to use interruptable (true) or non-interruptable * (false) sleep when waiting for the sequence number. Helper function * for radeon_fence_wait_*(). * Returns remaining time if the sequence number has passed, 0 when * the wait timeout, or an error for all other cases. * -EDEADLK is returned when a GPU lockup has been detected. */ static long radeon_fence_wait_seq_timeout(struct radeon_device *rdev, u64 *target_seq, bool intr, long timeout) { long r; int i; if (radeon_fence_any_seq_signaled(rdev, target_seq)) return timeout; /* enable IRQs and tracing */ for (i = 0; i < RADEON_NUM_RINGS; ++i) { if (!target_seq[i]) continue; trace_radeon_fence_wait_begin(rdev->ddev, i, target_seq[i]); radeon_irq_kms_sw_irq_get(rdev, i); } if (intr) { r = wait_event_interruptible_timeout(rdev->fence_queue, ( radeon_fence_any_seq_signaled(rdev, target_seq) || rdev->needs_reset), timeout); } else { r = wait_event_timeout(rdev->fence_queue, ( radeon_fence_any_seq_signaled(rdev, target_seq) || rdev->needs_reset), timeout); } if (rdev->needs_reset) r = -EDEADLK; for (i = 0; i < RADEON_NUM_RINGS; ++i) { if (!target_seq[i]) continue; radeon_irq_kms_sw_irq_put(rdev, i); trace_radeon_fence_wait_end(rdev->ddev, i, target_seq[i]); } return r; } /** * radeon_fence_wait - wait for a fence to signal * * @fence: radeon fence object * @intr: use interruptible sleep * * Wait for the requested fence to signal (all asics). * @intr selects whether to use interruptable (true) or non-interruptable * (false) sleep when waiting for the fence. * Returns 0 if the fence has passed, error for all other cases. */ int radeon_fence_wait(struct radeon_fence *fence, bool intr) { uint64_t seq[RADEON_NUM_RINGS] = {}; long r; /* * This function should not be called on !radeon fences. * If this is the case, it would mean this function can * also be called on radeon fences belonging to another card. * exclusive_lock is not held in that case. */ if (WARN_ON_ONCE(!to_radeon_fence(&fence->base))) return fence_wait(&fence->base, intr); seq[fence->ring] = fence->seq; r = radeon_fence_wait_seq_timeout(fence->rdev, seq, intr, MAX_SCHEDULE_TIMEOUT); if (r < 0) { return r; } r = fence_signal(&fence->base); if (!r) FENCE_TRACE(&fence->base, "signaled from fence_wait\n"); return 0; } /** * radeon_fence_wait_any - wait for a fence to signal on any ring * * @rdev: radeon device pointer * @fences: radeon fence object(s) * @intr: use interruptable sleep * * Wait for any requested fence to signal (all asics). Fence * array is indexed by ring id. @intr selects whether to use * interruptable (true) or non-interruptable (false) sleep when * waiting for the fences. Used by the suballocator. * Returns 0 if any fence has passed, error for all other cases. */ int radeon_fence_wait_any(struct radeon_device *rdev, struct radeon_fence **fences, bool intr) { uint64_t seq[RADEON_NUM_RINGS]; unsigned i, num_rings = 0; long r; for (i = 0; i < RADEON_NUM_RINGS; ++i) { seq[i] = 0; if (!fences[i]) { continue; } seq[i] = fences[i]->seq; ++num_rings; } /* nothing to wait for ? */ if (num_rings == 0) return -ENOENT; r = radeon_fence_wait_seq_timeout(rdev, seq, intr, MAX_SCHEDULE_TIMEOUT); if (r < 0) { return r; } return 0; } /** * radeon_fence_wait_next - wait for the next fence to signal * * @rdev: radeon device pointer * @ring: ring index the fence is associated with * * Wait for the next fence on the requested ring to signal (all asics). * Returns 0 if the next fence has passed, error for all other cases. * Caller must hold ring lock. */ int radeon_fence_wait_next(struct radeon_device *rdev, int ring) { uint64_t seq[RADEON_NUM_RINGS] = {}; long r; seq[ring] = atomic64_read(&rdev->fence_drv[ring].last_seq) + 1ULL; if (seq[ring] >= rdev->fence_drv[ring].sync_seq[ring]) { /* nothing to wait for, last_seq is already the last emited fence */ return -ENOENT; } r = radeon_fence_wait_seq_timeout(rdev, seq, false, MAX_SCHEDULE_TIMEOUT); if (r < 0) return r; return 0; } /** * radeon_fence_wait_empty - wait for all fences to signal * * @rdev: radeon device pointer * @ring: ring index the fence is associated with * * Wait for all fences on the requested ring to signal (all asics). * Returns 0 if the fences have passed, error for all other cases. * Caller must hold ring lock. */ int radeon_fence_wait_empty(struct radeon_device *rdev, int ring) { uint64_t seq[RADEON_NUM_RINGS] = {}; long r; seq[ring] = rdev->fence_drv[ring].sync_seq[ring]; if (!seq[ring]) return 0; r = radeon_fence_wait_seq_timeout(rdev, seq, false, MAX_SCHEDULE_TIMEOUT); if (r < 0) { if (r == -EDEADLK) return -EDEADLK; dev_err(rdev->dev, "error waiting for ring[%d] to become idle (%ld)\n", ring, r); } return 0; } /** * radeon_fence_ref - take a ref on a fence * * @fence: radeon fence object * * Take a reference on a fence (all asics). * Returns the fence. */ struct radeon_fence *radeon_fence_ref(struct radeon_fence *fence) { fence_get(&fence->base); return fence; } /** * radeon_fence_unref - remove a ref on a fence * * @fence: radeon fence object * * Remove a reference on a fence (all asics). */ void radeon_fence_unref(struct radeon_fence **fence) { struct radeon_fence *tmp = *fence; *fence = NULL; if (tmp) { fence_put(&tmp->base); } } /** * radeon_fence_count_emitted - get the count of emitted fences * * @rdev: radeon device pointer * @ring: ring index the fence is associated with * * Get the number of fences emitted on the requested ring (all asics). * Returns the number of emitted fences on the ring. Used by the * dynpm code to ring track activity. */ unsigned radeon_fence_count_emitted(struct radeon_device *rdev, int ring) { uint64_t emitted; /* We are not protected by ring lock when reading the last sequence * but it's ok to report slightly wrong fence count here. */ radeon_fence_process(rdev, ring); emitted = rdev->fence_drv[ring].sync_seq[ring] - atomic64_read(&rdev->fence_drv[ring].last_seq); /* to avoid 32bits warp around */ if (emitted > 0x10000000) { emitted = 0x10000000; } return (unsigned)emitted; } /** * radeon_fence_need_sync - do we need a semaphore * * @fence: radeon fence object * @dst_ring: which ring to check against * * Check if the fence needs to be synced against another ring * (all asics). If so, we need to emit a semaphore. * Returns true if we need to sync with another ring, false if * not. */ bool radeon_fence_need_sync(struct radeon_fence *fence, int dst_ring) { struct radeon_fence_driver *fdrv; if (!fence) { return false; } if (fence->ring == dst_ring) { return false; } /* we are protected by the ring mutex */ fdrv = &fence->rdev->fence_drv[dst_ring]; if (fence->seq <= fdrv->sync_seq[fence->ring]) { return false; } return true; } /** * radeon_fence_note_sync - record the sync point * * @fence: radeon fence object * @dst_ring: which ring to check against * * Note the sequence number at which point the fence will * be synced with the requested ring (all asics). */ void radeon_fence_note_sync(struct radeon_fence *fence, int dst_ring) { struct radeon_fence_driver *dst, *src; unsigned i; if (!fence) { return; } if (fence->ring == dst_ring) { return; } /* we are protected by the ring mutex */ src = &fence->rdev->fence_drv[fence->ring]; dst = &fence->rdev->fence_drv[dst_ring]; for (i = 0; i < RADEON_NUM_RINGS; ++i) { if (i == dst_ring) { continue; } dst->sync_seq[i] = max(dst->sync_seq[i], src->sync_seq[i]); } } /** * radeon_fence_driver_start_ring - make the fence driver * ready for use on the requested ring. * * @rdev: radeon device pointer * @ring: ring index to start the fence driver on * * Make the fence driver ready for processing (all asics). * Not all asics have all rings, so each asic will only * start the fence driver on the rings it has. * Returns 0 for success, errors for failure. */ int radeon_fence_driver_start_ring(struct radeon_device *rdev, int ring) { uint64_t index; int r; radeon_scratch_free(rdev, rdev->fence_drv[ring].scratch_reg); if (rdev->wb.use_event || !radeon_ring_supports_scratch_reg(rdev, &rdev->ring[ring])) { rdev->fence_drv[ring].scratch_reg = 0; if (ring != R600_RING_TYPE_UVD_INDEX) { index = R600_WB_EVENT_OFFSET + ring * 4; rdev->fence_drv[ring].cpu_addr = &rdev->wb.wb[index/4]; rdev->fence_drv[ring].gpu_addr = rdev->wb.gpu_addr + index; } else { /* put fence directly behind firmware */ index = ALIGN(rdev->uvd_fw->size, 8); rdev->fence_drv[ring].cpu_addr = rdev->uvd.cpu_addr + index; rdev->fence_drv[ring].gpu_addr = rdev->uvd.gpu_addr + index; } } else { r = radeon_scratch_get(rdev, &rdev->fence_drv[ring].scratch_reg); if (r) { dev_err(rdev->dev, "fence failed to get scratch register\n"); return r; } index = RADEON_WB_SCRATCH_OFFSET + rdev->fence_drv[ring].scratch_reg - rdev->scratch.reg_base; rdev->fence_drv[ring].cpu_addr = &rdev->wb.wb[index/4]; rdev->fence_drv[ring].gpu_addr = rdev->wb.gpu_addr + index; } radeon_fence_write(rdev, atomic64_read(&rdev->fence_drv[ring].last_seq), ring); rdev->fence_drv[ring].initialized = true; dev_info(rdev->dev, "fence driver on ring %d use gpu addr 0x%016llx and cpu addr 0x%p\n", ring, rdev->fence_drv[ring].gpu_addr, rdev->fence_drv[ring].cpu_addr); return 0; } /** * radeon_fence_driver_init_ring - init the fence driver * for the requested ring. * * @rdev: radeon device pointer * @ring: ring index to start the fence driver on * * Init the fence driver for the requested ring (all asics). * Helper function for radeon_fence_driver_init(). */ static void radeon_fence_driver_init_ring(struct radeon_device *rdev, int ring) { int i; rdev->fence_drv[ring].scratch_reg = -1; rdev->fence_drv[ring].cpu_addr = NULL; rdev->fence_drv[ring].gpu_addr = 0; for (i = 0; i < RADEON_NUM_RINGS; ++i) rdev->fence_drv[ring].sync_seq[i] = 0; atomic64_set(&rdev->fence_drv[ring].last_seq, 0); rdev->fence_drv[ring].initialized = false; INIT_DELAYED_WORK(&rdev->fence_drv[ring].lockup_work, radeon_fence_check_lockup); rdev->fence_drv[ring].rdev = rdev; } /** * radeon_fence_driver_init - init the fence driver * for all possible rings. * * @rdev: radeon device pointer * * Init the fence driver for all possible rings (all asics). * Not all asics have all rings, so each asic will only * start the fence driver on the rings it has using * radeon_fence_driver_start_ring(). * Returns 0 for success. */ int radeon_fence_driver_init(struct radeon_device *rdev) { int ring; init_waitqueue_head(&rdev->fence_queue); for (ring = 0; ring < RADEON_NUM_RINGS; ring++) { radeon_fence_driver_init_ring(rdev, ring); } if (radeon_debugfs_fence_init(rdev)) { dev_err(rdev->dev, "fence debugfs file creation failed\n"); } return 0; } /** * radeon_fence_driver_fini - tear down the fence driver * for all possible rings. * * @rdev: radeon device pointer * * Tear down the fence driver for all possible rings (all asics). */ void radeon_fence_driver_fini(struct radeon_device *rdev) { int ring, r; mutex_lock(&rdev->ring_lock); for (ring = 0; ring < RADEON_NUM_RINGS; ring++) { if (!rdev->fence_drv[ring].initialized) continue; r = radeon_fence_wait_empty(rdev, ring); if (r) { /* no need to trigger GPU reset as we are unloading */ radeon_fence_driver_force_completion(rdev, ring); } cancel_delayed_work_sync(&rdev->fence_drv[ring].lockup_work); wake_up_all(&rdev->fence_queue); radeon_scratch_free(rdev, rdev->fence_drv[ring].scratch_reg); rdev->fence_drv[ring].initialized = false; } mutex_unlock(&rdev->ring_lock); } /** * radeon_fence_driver_force_completion - force all fence waiter to complete * * @rdev: radeon device pointer * @ring: the ring to complete * * In case of GPU reset failure make sure no process keep waiting on fence * that will never complete. */ void radeon_fence_driver_force_completion(struct radeon_device *rdev, int ring) { if (rdev->fence_drv[ring].initialized) { radeon_fence_write(rdev, rdev->fence_drv[ring].sync_seq[ring], ring); cancel_delayed_work_sync(&rdev->fence_drv[ring].lockup_work); } } /* * Fence debugfs */ #if defined(CONFIG_DEBUG_FS) static int radeon_debugfs_fence_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 radeon_device *rdev = dev->dev_private; int i, j; for (i = 0; i < RADEON_NUM_RINGS; ++i) { if (!rdev->fence_drv[i].initialized) continue; radeon_fence_process(rdev, i); seq_printf(m, "--- ring %d ---\n", i); seq_printf(m, "Last signaled fence 0x%016llx\n", (unsigned long long)atomic64_read(&rdev->fence_drv[i].last_seq)); seq_printf(m, "Last emitted 0x%016llx\n", rdev->fence_drv[i].sync_seq[i]); for (j = 0; j < RADEON_NUM_RINGS; ++j) { if (i != j && rdev->fence_drv[j].initialized) seq_printf(m, "Last sync to ring %d 0x%016llx\n", j, rdev->fence_drv[i].sync_seq[j]); } } return 0; } /** * radeon_debugfs_gpu_reset - manually trigger a gpu reset * * Manually trigger a gpu reset at the next fence wait. */ static int radeon_debugfs_gpu_reset(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 radeon_device *rdev = dev->dev_private; down_read(&rdev->exclusive_lock); seq_printf(m, "%d\n", rdev->needs_reset); rdev->needs_reset = true; wake_up_all(&rdev->fence_queue); up_read(&rdev->exclusive_lock); return 0; } static struct drm_info_list radeon_debugfs_fence_list[] = { {"radeon_fence_info", &radeon_debugfs_fence_info, 0, NULL}, {"radeon_gpu_reset", &radeon_debugfs_gpu_reset, 0, NULL} }; #endif int radeon_debugfs_fence_init(struct radeon_device *rdev) { #if defined(CONFIG_DEBUG_FS) return radeon_debugfs_add_files(rdev, radeon_debugfs_fence_list, 2); #else return 0; #endif } static const char *radeon_fence_get_driver_name(struct fence *fence) { return "radeon"; } static const char *radeon_fence_get_timeline_name(struct fence *f) { struct radeon_fence *fence = to_radeon_fence(f); switch (fence->ring) { case RADEON_RING_TYPE_GFX_INDEX: return "radeon.gfx"; case CAYMAN_RING_TYPE_CP1_INDEX: return "radeon.cp1"; case CAYMAN_RING_TYPE_CP2_INDEX: return "radeon.cp2"; case R600_RING_TYPE_DMA_INDEX: return "radeon.dma"; case CAYMAN_RING_TYPE_DMA1_INDEX: return "radeon.dma1"; case R600_RING_TYPE_UVD_INDEX: return "radeon.uvd"; case TN_RING_TYPE_VCE1_INDEX: return "radeon.vce1"; case TN_RING_TYPE_VCE2_INDEX: return "radeon.vce2"; default: WARN_ON_ONCE(1); return "radeon.unk"; } } static inline bool radeon_test_signaled(struct radeon_fence *fence) { return test_bit(FENCE_FLAG_SIGNALED_BIT, &fence->base.flags); } struct radeon_wait_cb { struct fence_cb base; struct task_struct *task; }; static void radeon_fence_wait_cb(struct fence *fence, struct fence_cb *cb) { struct radeon_wait_cb *wait = container_of(cb, struct radeon_wait_cb, base); wake_up_process(wait->task); } static signed long radeon_fence_default_wait(struct fence *f, bool intr, signed long t) { struct radeon_fence *fence = to_radeon_fence(f); struct radeon_device *rdev = fence->rdev; struct radeon_wait_cb cb; cb.task = current; if (fence_add_callback(f, &cb.base, radeon_fence_wait_cb)) return t; while (t > 0) { if (intr) set_current_state(TASK_INTERRUPTIBLE); else set_current_state(TASK_UNINTERRUPTIBLE); /* * radeon_test_signaled must be called after * set_current_state to prevent a race with wake_up_process */ if (radeon_test_signaled(fence)) break; if (rdev->needs_reset) { t = -EDEADLK; break; } t = schedule_timeout(t); if (t > 0 && intr && signal_pending(current)) t = -ERESTARTSYS; } __set_current_state(TASK_RUNNING); fence_remove_callback(f, &cb.base); return t; } const struct fence_ops radeon_fence_ops = { .get_driver_name = radeon_fence_get_driver_name, .get_timeline_name = radeon_fence_get_timeline_name, .enable_signaling = radeon_fence_enable_signaling, .signaled = radeon_fence_is_signaled, .wait = radeon_fence_default_wait, .release = NULL, };