--- /dev/null
+/*
+ * 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.
+ */
+
+static struct kmem_cache *amdgpu_fence_slab;
+static atomic_t amdgpu_fence_slab_ref = ATOMIC_INIT(0);
+
+/**
+ * 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_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 = kmem_cache_alloc(amdgpu_fence_slab, 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,
+ &ring->fence_drv.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);
+ return 0;
+}
+
+/**
+ * amdgpu_fence_schedule_fallback - schedule fallback check
+ *
+ * @ring: pointer to struct amdgpu_ring
+ *
+ * Start a timer as fallback to our interrupts.
+ */
+static void amdgpu_fence_schedule_fallback(struct amdgpu_ring *ring)
+{
+ mod_timer(&ring->fence_drv.fallback_timer,
+ jiffies + AMDGPU_FENCE_JIFFIES_TIMEOUT);
+}
+
+/**
+ * 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_fallback(ring);
+
+ return wake;
+}
+
+/**
+ * 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)
+{
+ if (amdgpu_fence_activity(ring))
+ wake_up_all(&ring->fence_drv.fence_queue);
+}
+
+/**
+ * amdgpu_fence_fallback - fallback for hardware interrupts
+ *
+ * @work: delayed work item
+ *
+ * Checks for fence activity.
+ */
+static void amdgpu_fence_fallback(unsigned long arg)
+{
+ struct amdgpu_ring *ring = (void *)arg;
+
+ amdgpu_fence_process(ring);
+}
+
+/**
+ * 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;
+}
+
+/*
+ * amdgpu_ring_wait_seq_timeout - wait for seq of the specific ring to signal
+ * @ring: ring to wait on for the seq number
+ * @seq: seq number wait for
+ *
+ * return value:
+ * 0: seq signaled, and gpu not hang
+ * -EDEADL: GPU hang detected
+ * -EINVAL: some paramter is not valid
+ */
+static int amdgpu_fence_ring_wait_seq(struct amdgpu_ring *ring, uint64_t seq)
+{
+ bool signaled = false;
+
+ BUG_ON(!ring);
+ if (seq > ring->fence_drv.sync_seq[ring->idx])
+ return -EINVAL;
+
+ if (atomic64_read(&ring->fence_drv.last_seq) >= seq)
+ return 0;
+
+ amdgpu_fence_schedule_fallback(ring);
+ wait_event(ring->fence_drv.fence_queue, (
+ (signaled = amdgpu_fence_seq_signaled(ring, seq))));
+
+ if (signaled)
+ return 0;
+ else
+ return -EDEADLK;
+}
+
+/**
+ * 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 = atomic64_read(&ring->fence_drv.last_seq) + 1ULL;
+
+ if (seq >= ring->fence_drv.sync_seq[ring->idx])
+ return -ENOENT;
+
+ return amdgpu_fence_ring_wait_seq(ring, seq);
+}
+
+/**
+ * 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)
+{
+ uint64_t seq = ring->fence_drv.sync_seq[ring->idx];
+
+ if (!seq)
+ return 0;
+
+ return amdgpu_fence_ring_wait_seq(ring, seq);
+}
+
+/**
+ * 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().
+ */
+int amdgpu_fence_driver_init_ring(struct amdgpu_ring *ring)
+{
+ int i, r;
+
+ 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;
+
+ setup_timer(&ring->fence_drv.fallback_timer, amdgpu_fence_fallback,
+ (unsigned long)ring);
+
+ init_waitqueue_head(&ring->fence_drv.fence_queue);
+
+ if (amdgpu_enable_scheduler) {
+ long timeout = msecs_to_jiffies(amdgpu_lockup_timeout);
+ if (timeout == 0) {
+ /*
+ * FIXME:
+ * Delayed workqueue cannot use it directly,
+ * so the scheduler will not use delayed workqueue if
+ * MAX_SCHEDULE_TIMEOUT is set.
+ * Currently keep it simple and silly.
+ */
+ timeout = MAX_SCHEDULE_TIMEOUT;
+ }
+ r = amd_sched_init(&ring->sched, &amdgpu_sched_ops,
+ amdgpu_sched_hw_submission,
+ timeout, ring->name);
+ if (r) {
+ DRM_ERROR("Failed to create scheduler on ring %s.\n",
+ ring->name);
+ return r;
+ }
+ }
+
+ return 0;
+}
+
+/**
+ * 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)
+{
+ if (atomic_inc_return(&amdgpu_fence_slab_ref) == 1) {
+ amdgpu_fence_slab = kmem_cache_create(
+ "amdgpu_fence", sizeof(struct amdgpu_fence), 0,
+ SLAB_HWCACHE_ALIGN, NULL);
+ if (!amdgpu_fence_slab)
+ return -ENOMEM;
+ }
+ 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;
+
+ if (atomic_dec_and_test(&amdgpu_fence_slab_ref))
+ kmem_cache_destroy(amdgpu_fence_slab);
+ 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(&ring->fence_drv.fence_queue);
+ amdgpu_irq_put(adev, ring->fence_drv.irq_src,
+ ring->fence_drv.irq_type);
+ amd_sched_fini(&ring->sched);
+ del_timer_sync(&ring->fence_drv.fallback_timer);
+ 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]);
+ }
+}
+
+/*
+ * Common fence implementation
+ */
+
+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;
+}
+
+/**
+ * amdgpu_fence_is_signaled - test if fence is signaled
+ *
+ * @f: fence to test
+ *
+ * Test the fence sequence number if it is already signaled. If it isn't
+ * signaled start fence processing. Returns True if the fence is signaled.
+ */
+static bool amdgpu_fence_is_signaled(struct fence *f)
+{
+ struct amdgpu_fence *fence = to_amdgpu_fence(f);
+ struct amdgpu_ring *ring = fence->ring;
+
+ if (atomic64_read(&ring->fence_drv.last_seq) >= fence->seq)
+ return true;
+
+ amdgpu_fence_process(ring);
+
+ if (atomic64_read(&ring->fence_drv.last_seq) >= fence->seq)
+ return true;
+
+ return false;
+}
+
+/**
+ * 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(&fence->ring->fence_drv.fence_queue, &fence->fence_wake);
+ fence_put(&fence->base);
+ } else
+ FENCE_TRACE(&fence->base, "pending\n");
+ return 0;
+}
+
+/**
+ * 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;
+
+ 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(&ring->fence_drv.fence_queue, &fence->fence_wake);
+ fence_get(f);
+ if (!timer_pending(&ring->fence_drv.fallback_timer))
+ amdgpu_fence_schedule_fallback(ring);
+ FENCE_TRACE(&fence->base, "armed on ring %i!\n", ring->idx);
+ return true;
+}
+
+static void amdgpu_fence_release(struct fence *f)
+{
+ struct amdgpu_fence *fence = to_amdgpu_fence(f);
+ kmem_cache_free(amdgpu_fence_slab, fence);
+}
+
+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 = fence_default_wait,
+ .release = amdgpu_fence_release,
+};
+
+/*
+ * 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
+}
+
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