| /* |
| * 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 <glisse@freedesktop.org> |
| * Dave Airlie |
| */ |
| #include <linux/seq_file.h> |
| #include <linux/atomic.h> |
| #include <linux/wait.h> |
| #include <linux/kref.h> |
| #include <linux/slab.h> |
| #include <linux/firmware.h> |
| #include <drm/drmP.h> |
| #include "amdgpu.h" |
| #include "amdgpu_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. |
| */ |
| |
| /** |
| * amdgpu_fence_write - write a fence value |
| * |
| * @ring: ring the fence is associated with |
| * @seq: sequence number to write |
| * |
| * Writes a fence value to memory (all asics). |
| */ |
| static void amdgpu_fence_write(struct amdgpu_ring *ring, u32 seq) |
| { |
| struct amdgpu_fence_driver *drv = &ring->fence_drv; |
| |
| if (drv->cpu_addr) |
| *drv->cpu_addr = cpu_to_le32(seq); |
| } |
| |
| /** |
| * amdgpu_fence_read - read a fence value |
| * |
| * @ring: ring the fence is associated with |
| * |
| * Reads a fence value from memory (all asics). |
| * Returns the value of the fence read from memory. |
| */ |
| static u32 amdgpu_fence_read(struct amdgpu_ring *ring) |
| { |
| struct amdgpu_fence_driver *drv = &ring->fence_drv; |
| u32 seq = 0; |
| |
| if (drv->cpu_addr) |
| seq = le32_to_cpu(*drv->cpu_addr); |
| else |
| seq = lower_32_bits(atomic64_read(&drv->last_seq)); |
| |
| return seq; |
| } |
| |
| /** |
| * amdgpu_fence_schedule_check - schedule lockup check |
| * |
| * @ring: pointer to struct amdgpu_ring |
| * |
| * Queues a delayed work item to check for lockups. |
| */ |
| static void amdgpu_fence_schedule_check(struct amdgpu_ring *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, |
| &ring->fence_drv.lockup_work, |
| AMDGPU_FENCE_JIFFIES_TIMEOUT); |
| } |
| |
| /** |
| * amdgpu_fence_emit - emit a fence on the requested ring |
| * |
| * @ring: ring the fence is associated with |
| * @owner: creator of the fence |
| * @fence: amdgpu fence object |
| * |
| * Emits a fence command on the requested ring (all asics). |
| * Returns 0 on success, -ENOMEM on failure. |
| */ |
| int amdgpu_fence_emit(struct amdgpu_ring *ring, void *owner, |
| struct amdgpu_fence **fence) |
| { |
| struct amdgpu_device *adev = ring->adev; |
| |
| /* we are protected by the ring emission mutex */ |
| *fence = kmalloc(sizeof(struct amdgpu_fence), GFP_KERNEL); |
| if ((*fence) == NULL) { |
| return -ENOMEM; |
| } |
| (*fence)->seq = ++ring->fence_drv.sync_seq[ring->idx]; |
| (*fence)->ring = ring; |
| (*fence)->owner = owner; |
| fence_init(&(*fence)->base, &amdgpu_fence_ops, |
| &adev->fence_queue.lock, adev->fence_context + ring->idx, |
| (*fence)->seq); |
| amdgpu_ring_emit_fence(ring, ring->fence_drv.gpu_addr, |
| (*fence)->seq, |
| AMDGPU_FENCE_FLAG_INT); |
| trace_amdgpu_fence_emit(ring->adev->ddev, ring->idx, (*fence)->seq); |
| return 0; |
| } |
| |
| /** |
| * amdgpu_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 amdgpu_fence_check_signaled(wait_queue_t *wait, unsigned mode, int flags, void *key) |
| { |
| struct amdgpu_fence *fence; |
| struct amdgpu_device *adev; |
| u64 seq; |
| int ret; |
| |
| fence = container_of(wait, struct amdgpu_fence, fence_wake); |
| adev = fence->ring->adev; |
| |
| /* |
| * We cannot use amdgpu_fence_process here because we're already |
| * in the waitqueue, in a call from wake_up_all. |
| */ |
| seq = atomic64_read(&fence->ring->fence_drv.last_seq); |
| if (seq >= fence->seq) { |
| 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"); |
| |
| __remove_wait_queue(&adev->fence_queue, &fence->fence_wake); |
| fence_put(&fence->base); |
| } else |
| FENCE_TRACE(&fence->base, "pending\n"); |
| return 0; |
| } |
| |
| /** |
| * amdgpu_fence_activity - check for fence activity |
| * |
| * @ring: pointer to struct amdgpu_ring |
| * |
| * 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 amdgpu_fence_activity(struct amdgpu_ring *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 amdgpu_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 amdgpu_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(&ring->fence_drv.last_seq); |
| do { |
| last_emitted = ring->fence_drv.sync_seq[ring->idx]; |
| seq = amdgpu_fence_read(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(&ring->fence_drv.last_seq, seq) > seq); |
| |
| if (seq < last_emitted) |
| amdgpu_fence_schedule_check(ring); |
| |
| return wake; |
| } |
| |
| /** |
| * amdgpu_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 amdgpu_fence_check_lockup(struct work_struct *work) |
| { |
| struct amdgpu_fence_driver *fence_drv; |
| struct amdgpu_ring *ring; |
| |
| fence_drv = container_of(work, struct amdgpu_fence_driver, |
| lockup_work.work); |
| ring = fence_drv->ring; |
| |
| if (!down_read_trylock(&ring->adev->exclusive_lock)) { |
| /* just reschedule the check if a reset is going on */ |
| amdgpu_fence_schedule_check(ring); |
| return; |
| } |
| |
| if (amdgpu_fence_activity(ring)) |
| wake_up_all(&ring->adev->fence_queue); |
| else if (amdgpu_ring_is_lockup(ring)) { |
| /* good news we believe it's a lockup */ |
| dev_warn(ring->adev->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->idx], ring->idx); |
| |
| /* remember that we need an reset */ |
| ring->adev->needs_reset = true; |
| wake_up_all(&ring->adev->fence_queue); |
| } |
| up_read(&ring->adev->exclusive_lock); |
| } |
| |
| /** |
| * amdgpu_fence_process - process a fence |
| * |
| * @adev: amdgpu_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 amdgpu_fence_process(struct amdgpu_ring *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 amdgpu_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 amdgpu_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(&ring->fence_drv.last_seq); |
| do { |
| last_emitted = ring->fence_drv.sync_seq[ring->idx]; |
| seq = amdgpu_fence_read(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(&ring->fence_drv.last_seq, seq) > seq); |
| |
| if (wake) |
| wake_up_all(&ring->adev->fence_queue); |
| } |
| |
| /** |
| * amdgpu_fence_seq_signaled - check if a fence sequence number has signaled |
| * |
| * @ring: ring the fence is associated with |
| * @seq: sequence number |
| * |
| * 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 |
| * amdgpu_fence_signaled(). |
| */ |
| static bool amdgpu_fence_seq_signaled(struct amdgpu_ring *ring, u64 seq) |
| { |
| if (atomic64_read(&ring->fence_drv.last_seq) >= seq) |
| return true; |
| |
| /* poll new last sequence at least once */ |
| amdgpu_fence_process(ring); |
| if (atomic64_read(&ring->fence_drv.last_seq) >= seq) |
| return true; |
| |
| return false; |
| } |
| |
| static bool amdgpu_fence_is_signaled(struct fence *f) |
| { |
| struct amdgpu_fence *fence = to_amdgpu_fence(f); |
| struct amdgpu_ring *ring = fence->ring; |
| struct amdgpu_device *adev = ring->adev; |
| |
| if (atomic64_read(&ring->fence_drv.last_seq) >= fence->seq) |
| return true; |
| |
| if (down_read_trylock(&adev->exclusive_lock)) { |
| amdgpu_fence_process(ring); |
| up_read(&adev->exclusive_lock); |
| |
| if (atomic64_read(&ring->fence_drv.last_seq) >= fence->seq) |
| return true; |
| } |
| return false; |
| } |
| |
| /** |
| * amdgpu_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 amdgpu_fence_enable_signaling(struct fence *f) |
| { |
| struct amdgpu_fence *fence = to_amdgpu_fence(f); |
| struct amdgpu_ring *ring = fence->ring; |
| struct amdgpu_device *adev = ring->adev; |
| |
| if (atomic64_read(&ring->fence_drv.last_seq) >= fence->seq) |
| return false; |
| |
| fence->fence_wake.flags = 0; |
| fence->fence_wake.private = NULL; |
| fence->fence_wake.func = amdgpu_fence_check_signaled; |
| __add_wait_queue(&adev->fence_queue, &fence->fence_wake); |
| fence_get(f); |
| FENCE_TRACE(&fence->base, "armed on ring %i!\n", ring->idx); |
| return true; |
| } |
| |
| /** |
| * amdgpu_fence_signaled - check if a fence has signaled |
| * |
| * @fence: amdgpu 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 amdgpu_fence_signaled(struct amdgpu_fence *fence) |
| { |
| if (!fence) |
| return true; |
| |
| if (amdgpu_fence_seq_signaled(fence->ring, fence->seq)) { |
| if (!fence_signal(&fence->base)) |
| FENCE_TRACE(&fence->base, "signaled from amdgpu_fence_signaled\n"); |
| return true; |
| } |
| |
| return false; |
| } |
| |
| /** |
| * amdgpu_fence_any_seq_signaled - check if any sequence number is signaled |
| * |
| * @adev: amdgpu 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 amdgpu_fence_wait_seq. |
| */ |
| static bool amdgpu_fence_any_seq_signaled(struct amdgpu_device *adev, u64 *seq) |
| { |
| unsigned i; |
| |
| for (i = 0; i < AMDGPU_MAX_RINGS; ++i) { |
| if (!adev->rings[i] || !seq[i]) |
| continue; |
| |
| if (amdgpu_fence_seq_signaled(adev->rings[i], seq[i])) |
| return true; |
| } |
| |
| return false; |
| } |
| |
| /** |
| * amdgpu_fence_wait_seq_timeout - wait for a specific sequence numbers |
| * |
| * @adev: amdgpu 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 amdgpu_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 amdgpu_fence_wait_seq_timeout(struct amdgpu_device *adev, |
| u64 *target_seq, bool intr, |
| long timeout) |
| { |
| uint64_t last_seq[AMDGPU_MAX_RINGS]; |
| bool signaled; |
| int i; |
| long r; |
| |
| if (timeout == 0) { |
| return amdgpu_fence_any_seq_signaled(adev, target_seq); |
| } |
| |
| while (!amdgpu_fence_any_seq_signaled(adev, target_seq)) { |
| |
| /* Save current sequence values, used to check for GPU lockups */ |
| for (i = 0; i < AMDGPU_MAX_RINGS; ++i) { |
| struct amdgpu_ring *ring = adev->rings[i]; |
| |
| if (!ring || !target_seq[i]) |
| continue; |
| |
| last_seq[i] = atomic64_read(&ring->fence_drv.last_seq); |
| trace_amdgpu_fence_wait_begin(adev->ddev, i, target_seq[i]); |
| } |
| |
| if (intr) { |
| r = wait_event_interruptible_timeout(adev->fence_queue, ( |
| (signaled = amdgpu_fence_any_seq_signaled(adev, target_seq)) |
| || adev->needs_reset), AMDGPU_FENCE_JIFFIES_TIMEOUT); |
| } else { |
| r = wait_event_timeout(adev->fence_queue, ( |
| (signaled = amdgpu_fence_any_seq_signaled(adev, target_seq)) |
| || adev->needs_reset), AMDGPU_FENCE_JIFFIES_TIMEOUT); |
| } |
| |
| for (i = 0; i < AMDGPU_MAX_RINGS; ++i) { |
| struct amdgpu_ring *ring = adev->rings[i]; |
| |
| if (!ring || !target_seq[i]) |
| continue; |
| |
| trace_amdgpu_fence_wait_end(adev->ddev, i, target_seq[i]); |
| } |
| |
| if (unlikely(r < 0)) |
| return r; |
| |
| if (unlikely(!signaled)) { |
| |
| if (adev->needs_reset) |
| return -EDEADLK; |
| |
| /* we were interrupted for some reason and fence |
| * isn't signaled yet, resume waiting */ |
| if (r) |
| continue; |
| |
| for (i = 0; i < AMDGPU_MAX_RINGS; ++i) { |
| struct amdgpu_ring *ring = adev->rings[i]; |
| |
| if (!ring || !target_seq[i]) |
| continue; |
| |
| if (last_seq[i] != atomic64_read(&ring->fence_drv.last_seq)) |
| break; |
| } |
| |
| if (i != AMDGPU_MAX_RINGS) |
| continue; |
| |
| for (i = 0; i < AMDGPU_MAX_RINGS; ++i) { |
| if (!adev->rings[i] || !target_seq[i]) |
| continue; |
| |
| if (amdgpu_ring_is_lockup(adev->rings[i])) |
| break; |
| } |
| |
| if (i < AMDGPU_MAX_RINGS) { |
| /* good news we believe it's a lockup */ |
| dev_warn(adev->dev, "GPU lockup (waiting for " |
| "0x%016llx last fence id 0x%016llx on" |
| " ring %d)\n", |
| target_seq[i], last_seq[i], i); |
| |
| /* remember that we need an reset */ |
| adev->needs_reset = true; |
| wake_up_all(&adev->fence_queue); |
| return -EDEADLK; |
| } |
| |
| if (timeout < MAX_SCHEDULE_TIMEOUT) { |
| timeout -= AMDGPU_FENCE_JIFFIES_TIMEOUT; |
| if (timeout <= 0) { |
| return 0; |
| } |
| } |
| } |
| } |
| return timeout; |
| } |
| |
| /** |
| * amdgpu_fence_wait - wait for a fence to signal |
| * |
| * @fence: amdgpu fence object |
| * @intr: use interruptable 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 amdgpu_fence_wait(struct amdgpu_fence *fence, bool intr) |
| { |
| uint64_t seq[AMDGPU_MAX_RINGS] = {}; |
| long r; |
| |
| seq[fence->ring->idx] = fence->seq; |
| r = amdgpu_fence_wait_seq_timeout(fence->ring->adev, 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; |
| } |
| |
| /** |
| * amdgpu_fence_wait_any - wait for a fence to signal on any ring |
| * |
| * @adev: amdgpu device pointer |
| * @fences: amdgpu 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 amdgpu_fence_wait_any(struct amdgpu_device *adev, |
| struct amdgpu_fence **fences, |
| bool intr) |
| { |
| uint64_t seq[AMDGPU_MAX_RINGS]; |
| unsigned i, num_rings = 0; |
| long r; |
| |
| for (i = 0; i < AMDGPU_MAX_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 = amdgpu_fence_wait_seq_timeout(adev, seq, intr, MAX_SCHEDULE_TIMEOUT); |
| if (r < 0) { |
| return r; |
| } |
| return 0; |
| } |
| |
| /** |
| * amdgpu_fence_wait_next - wait for the next fence to signal |
| * |
| * @adev: amdgpu 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 amdgpu_fence_wait_next(struct amdgpu_ring *ring) |
| { |
| uint64_t seq[AMDGPU_MAX_RINGS] = {}; |
| long r; |
| |
| seq[ring->idx] = atomic64_read(&ring->fence_drv.last_seq) + 1ULL; |
| if (seq[ring->idx] >= ring->fence_drv.sync_seq[ring->idx]) { |
| /* nothing to wait for, last_seq is |
| already the last emited fence */ |
| return -ENOENT; |
| } |
| r = amdgpu_fence_wait_seq_timeout(ring->adev, seq, false, MAX_SCHEDULE_TIMEOUT); |
| if (r < 0) |
| return r; |
| return 0; |
| } |
| |
| /** |
| * amdgpu_fence_wait_empty - wait for all fences to signal |
| * |
| * @adev: amdgpu 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 amdgpu_fence_wait_empty(struct amdgpu_ring *ring) |
| { |
| struct amdgpu_device *adev = ring->adev; |
| uint64_t seq[AMDGPU_MAX_RINGS] = {}; |
| long r; |
| |
| seq[ring->idx] = ring->fence_drv.sync_seq[ring->idx]; |
| if (!seq[ring->idx]) |
| return 0; |
| |
| r = amdgpu_fence_wait_seq_timeout(adev, seq, false, MAX_SCHEDULE_TIMEOUT); |
| if (r < 0) { |
| if (r == -EDEADLK) |
| return -EDEADLK; |
| |
| dev_err(adev->dev, "error waiting for ring[%d] to become idle (%ld)\n", |
| ring->idx, r); |
| } |
| return 0; |
| } |
| |
| /** |
| * amdgpu_fence_ref - take a ref on a fence |
| * |
| * @fence: amdgpu fence object |
| * |
| * Take a reference on a fence (all asics). |
| * Returns the fence. |
| */ |
| struct amdgpu_fence *amdgpu_fence_ref(struct amdgpu_fence *fence) |
| { |
| fence_get(&fence->base); |
| return fence; |
| } |
| |
| /** |
| * amdgpu_fence_unref - remove a ref on a fence |
| * |
| * @fence: amdgpu fence object |
| * |
| * Remove a reference on a fence (all asics). |
| */ |
| void amdgpu_fence_unref(struct amdgpu_fence **fence) |
| { |
| struct amdgpu_fence *tmp = *fence; |
| |
| *fence = NULL; |
| if (tmp) |
| fence_put(&tmp->base); |
| } |
| |
| /** |
| * amdgpu_fence_count_emitted - get the count of emitted fences |
| * |
| * @ring: ring 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 amdgpu_fence_count_emitted(struct amdgpu_ring *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. |
| */ |
| amdgpu_fence_process(ring); |
| emitted = ring->fence_drv.sync_seq[ring->idx] |
| - atomic64_read(&ring->fence_drv.last_seq); |
| /* to avoid 32bits warp around */ |
| if (emitted > 0x10000000) |
| emitted = 0x10000000; |
| |
| return (unsigned)emitted; |
| } |
| |
| /** |
| * amdgpu_fence_need_sync - do we need a semaphore |
| * |
| * @fence: amdgpu 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 amdgpu_fence_need_sync(struct amdgpu_fence *fence, |
| struct amdgpu_ring *dst_ring) |
| { |
| struct amdgpu_fence_driver *fdrv; |
| |
| if (!fence) |
| return false; |
| |
| if (fence->ring == dst_ring) |
| return false; |
| |
| /* we are protected by the ring mutex */ |
| fdrv = &dst_ring->fence_drv; |
| if (fence->seq <= fdrv->sync_seq[fence->ring->idx]) |
| return false; |
| |
| return true; |
| } |
| |
| /** |
| * amdgpu_fence_note_sync - record the sync point |
| * |
| * @fence: amdgpu 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 amdgpu_fence_note_sync(struct amdgpu_fence *fence, |
| struct amdgpu_ring *dst_ring) |
| { |
| struct amdgpu_fence_driver *dst, *src; |
| unsigned i; |
| |
| if (!fence) |
| return; |
| |
| if (fence->ring == dst_ring) |
| return; |
| |
| /* we are protected by the ring mutex */ |
| src = &fence->ring->fence_drv; |
| dst = &dst_ring->fence_drv; |
| for (i = 0; i < AMDGPU_MAX_RINGS; ++i) { |
| if (i == dst_ring->idx) |
| continue; |
| |
| dst->sync_seq[i] = max(dst->sync_seq[i], src->sync_seq[i]); |
| } |
| } |
| |
| /** |
| * amdgpu_fence_driver_start_ring - make the fence driver |
| * ready for use on the requested ring. |
| * |
| * @ring: ring to start the fence driver on |
| * @irq_src: interrupt source to use for this ring |
| * @irq_type: interrupt type to use for this ring |
| * |
| * 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 amdgpu_fence_driver_start_ring(struct amdgpu_ring *ring, |
| struct amdgpu_irq_src *irq_src, |
| unsigned irq_type) |
| { |
| struct amdgpu_device *adev = ring->adev; |
| uint64_t index; |
| |
| if (ring != &adev->uvd.ring) { |
| ring->fence_drv.cpu_addr = &adev->wb.wb[ring->fence_offs]; |
| ring->fence_drv.gpu_addr = adev->wb.gpu_addr + (ring->fence_offs * 4); |
| } else { |
| /* put fence directly behind firmware */ |
| index = ALIGN(adev->uvd.fw->size, 8); |
| ring->fence_drv.cpu_addr = adev->uvd.cpu_addr + index; |
| ring->fence_drv.gpu_addr = adev->uvd.gpu_addr + index; |
| } |
| amdgpu_fence_write(ring, atomic64_read(&ring->fence_drv.last_seq)); |
| amdgpu_irq_get(adev, irq_src, irq_type); |
| |
| ring->fence_drv.irq_src = irq_src; |
| ring->fence_drv.irq_type = irq_type; |
| ring->fence_drv.initialized = true; |
| |
| dev_info(adev->dev, "fence driver on ring %d use gpu addr 0x%016llx, " |
| "cpu addr 0x%p\n", ring->idx, |
| ring->fence_drv.gpu_addr, ring->fence_drv.cpu_addr); |
| return 0; |
| } |
| |
| /** |
| * amdgpu_fence_driver_init_ring - init the fence driver |
| * for the requested ring. |
| * |
| * @ring: ring to init the fence driver on |
| * |
| * Init the fence driver for the requested ring (all asics). |
| * Helper function for amdgpu_fence_driver_init(). |
| */ |
| void amdgpu_fence_driver_init_ring(struct amdgpu_ring *ring) |
| { |
| int i; |
| |
| ring->fence_drv.cpu_addr = NULL; |
| ring->fence_drv.gpu_addr = 0; |
| for (i = 0; i < AMDGPU_MAX_RINGS; ++i) |
| ring->fence_drv.sync_seq[i] = 0; |
| |
| atomic64_set(&ring->fence_drv.last_seq, 0); |
| ring->fence_drv.initialized = false; |
| |
| INIT_DELAYED_WORK(&ring->fence_drv.lockup_work, |
| amdgpu_fence_check_lockup); |
| ring->fence_drv.ring = ring; |
| } |
| |
| /** |
| * amdgpu_fence_driver_init - init the fence driver |
| * for all possible rings. |
| * |
| * @adev: amdgpu 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 |
| * amdgpu_fence_driver_start_ring(). |
| * Returns 0 for success. |
| */ |
| int amdgpu_fence_driver_init(struct amdgpu_device *adev) |
| { |
| init_waitqueue_head(&adev->fence_queue); |
| if (amdgpu_debugfs_fence_init(adev)) |
| dev_err(adev->dev, "fence debugfs file creation failed\n"); |
| |
| return 0; |
| } |
| |
| /** |
| * amdgpu_fence_driver_fini - tear down the fence driver |
| * for all possible rings. |
| * |
| * @adev: amdgpu device pointer |
| * |
| * Tear down the fence driver for all possible rings (all asics). |
| */ |
| void amdgpu_fence_driver_fini(struct amdgpu_device *adev) |
| { |
| int i, r; |
| |
| mutex_lock(&adev->ring_lock); |
| for (i = 0; i < AMDGPU_MAX_RINGS; i++) { |
| struct amdgpu_ring *ring = adev->rings[i]; |
| if (!ring || !ring->fence_drv.initialized) |
| continue; |
| r = amdgpu_fence_wait_empty(ring); |
| if (r) { |
| /* no need to trigger GPU reset as we are unloading */ |
| amdgpu_fence_driver_force_completion(adev); |
| } |
| wake_up_all(&adev->fence_queue); |
| amdgpu_irq_put(adev, ring->fence_drv.irq_src, |
| ring->fence_drv.irq_type); |
| ring->fence_drv.initialized = false; |
| } |
| mutex_unlock(&adev->ring_lock); |
| } |
| |
| /** |
| * amdgpu_fence_driver_suspend - suspend the fence driver |
| * for all possible rings. |
| * |
| * @adev: amdgpu device pointer |
| * |
| * Suspend the fence driver for all possible rings (all asics). |
| */ |
| void amdgpu_fence_driver_suspend(struct amdgpu_device *adev) |
| { |
| int i, r; |
| |
| mutex_lock(&adev->ring_lock); |
| for (i = 0; i < AMDGPU_MAX_RINGS; i++) { |
| struct amdgpu_ring *ring = adev->rings[i]; |
| if (!ring || !ring->fence_drv.initialized) |
| continue; |
| |
| /* wait for gpu to finish processing current batch */ |
| r = amdgpu_fence_wait_empty(ring); |
| if (r) { |
| /* delay GPU reset to resume */ |
| amdgpu_fence_driver_force_completion(adev); |
| } |
| |
| /* disable the interrupt */ |
| amdgpu_irq_put(adev, ring->fence_drv.irq_src, |
| ring->fence_drv.irq_type); |
| } |
| mutex_unlock(&adev->ring_lock); |
| } |
| |
| /** |
| * amdgpu_fence_driver_resume - resume the fence driver |
| * for all possible rings. |
| * |
| * @adev: amdgpu device pointer |
| * |
| * Resume 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 |
| * amdgpu_fence_driver_start_ring(). |
| * Returns 0 for success. |
| */ |
| void amdgpu_fence_driver_resume(struct amdgpu_device *adev) |
| { |
| int i; |
| |
| mutex_lock(&adev->ring_lock); |
| for (i = 0; i < AMDGPU_MAX_RINGS; i++) { |
| struct amdgpu_ring *ring = adev->rings[i]; |
| if (!ring || !ring->fence_drv.initialized) |
| continue; |
| |
| /* enable the interrupt */ |
| amdgpu_irq_get(adev, ring->fence_drv.irq_src, |
| ring->fence_drv.irq_type); |
| } |
| mutex_unlock(&adev->ring_lock); |
| } |
| |
| /** |
| * amdgpu_fence_driver_force_completion - force all fence waiter to complete |
| * |
| * @adev: amdgpu device pointer |
| * |
| * In case of GPU reset failure make sure no process keep waiting on fence |
| * that will never complete. |
| */ |
| void amdgpu_fence_driver_force_completion(struct amdgpu_device *adev) |
| { |
| int i; |
| |
| for (i = 0; i < AMDGPU_MAX_RINGS; i++) { |
| struct amdgpu_ring *ring = adev->rings[i]; |
| if (!ring || !ring->fence_drv.initialized) |
| continue; |
| |
| amdgpu_fence_write(ring, ring->fence_drv.sync_seq[i]); |
| } |
| } |
| |
| |
| /* |
| * Fence debugfs |
| */ |
| #if defined(CONFIG_DEBUG_FS) |
| static int amdgpu_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 amdgpu_device *adev = dev->dev_private; |
| int i, j; |
| |
| for (i = 0; i < AMDGPU_MAX_RINGS; ++i) { |
| struct amdgpu_ring *ring = adev->rings[i]; |
| if (!ring || !ring->fence_drv.initialized) |
| continue; |
| |
| amdgpu_fence_process(ring); |
| |
| seq_printf(m, "--- ring %d (%s) ---\n", i, ring->name); |
| seq_printf(m, "Last signaled fence 0x%016llx\n", |
| (unsigned long long)atomic64_read(&ring->fence_drv.last_seq)); |
| seq_printf(m, "Last emitted 0x%016llx\n", |
| ring->fence_drv.sync_seq[i]); |
| |
| for (j = 0; j < AMDGPU_MAX_RINGS; ++j) { |
| struct amdgpu_ring *other = adev->rings[j]; |
| if (i != j && other && other->fence_drv.initialized && |
| ring->fence_drv.sync_seq[j]) |
| seq_printf(m, "Last sync to ring %d 0x%016llx\n", |
| j, ring->fence_drv.sync_seq[j]); |
| } |
| } |
| return 0; |
| } |
| |
| static struct drm_info_list amdgpu_debugfs_fence_list[] = { |
| {"amdgpu_fence_info", &amdgpu_debugfs_fence_info, 0, NULL}, |
| }; |
| #endif |
| |
| int amdgpu_debugfs_fence_init(struct amdgpu_device *adev) |
| { |
| #if defined(CONFIG_DEBUG_FS) |
| return amdgpu_debugfs_add_files(adev, amdgpu_debugfs_fence_list, 1); |
| #else |
| return 0; |
| #endif |
| } |
| |
| static const char *amdgpu_fence_get_driver_name(struct fence *fence) |
| { |
| return "amdgpu"; |
| } |
| |
| static const char *amdgpu_fence_get_timeline_name(struct fence *f) |
| { |
| struct amdgpu_fence *fence = to_amdgpu_fence(f); |
| return (const char *)fence->ring->name; |
| } |
| |
| static inline bool amdgpu_test_signaled(struct amdgpu_fence *fence) |
| { |
| return test_bit(FENCE_FLAG_SIGNALED_BIT, &fence->base.flags); |
| } |
| |
| struct amdgpu_wait_cb { |
| struct fence_cb base; |
| struct task_struct *task; |
| }; |
| |
| static void amdgpu_fence_wait_cb(struct fence *fence, struct fence_cb *cb) |
| { |
| struct amdgpu_wait_cb *wait = |
| container_of(cb, struct amdgpu_wait_cb, base); |
| wake_up_process(wait->task); |
| } |
| |
| static signed long amdgpu_fence_default_wait(struct fence *f, bool intr, |
| signed long t) |
| { |
| struct amdgpu_fence *fence = to_amdgpu_fence(f); |
| struct amdgpu_device *adev = fence->ring->adev; |
| struct amdgpu_wait_cb cb; |
| |
| cb.task = current; |
| |
| if (fence_add_callback(f, &cb.base, amdgpu_fence_wait_cb)) |
| return t; |
| |
| while (t > 0) { |
| if (intr) |
| set_current_state(TASK_INTERRUPTIBLE); |
| else |
| set_current_state(TASK_UNINTERRUPTIBLE); |
| |
| /* |
| * amdgpu_test_signaled must be called after |
| * set_current_state to prevent a race with wake_up_process |
| */ |
| if (amdgpu_test_signaled(fence)) |
| break; |
| |
| if (adev->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 amdgpu_fence_ops = { |
| .get_driver_name = amdgpu_fence_get_driver_name, |
| .get_timeline_name = amdgpu_fence_get_timeline_name, |
| .enable_signaling = amdgpu_fence_enable_signaling, |
| .signaled = amdgpu_fence_is_signaled, |
| .wait = amdgpu_fence_default_wait, |
| .release = NULL, |
| }; |