Adding upstream version 5.10.209.upstream/5.10.209

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 793 insertions, 0 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c
new file mode 100644
index 000000000..d07c458c0
--- /dev/null
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_fence.c
@@ -0,0 +1,793 @@
+/*
+ * 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 <linux/pm_runtime.h>
+
+#include <drm/drm_debugfs.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.
+ */
+
+struct amdgpu_fence {
+	struct dma_fence base;
+
+	/* RB, DMA, etc. */
+	struct amdgpu_ring		*ring;
+};
+
+static struct kmem_cache *amdgpu_fence_slab;
+
+int amdgpu_fence_slab_init(void)
+{
+	amdgpu_fence_slab = kmem_cache_create(
+		"amdgpu_fence", sizeof(struct amdgpu_fence), 0,
+		SLAB_HWCACHE_ALIGN, NULL);
+	if (!amdgpu_fence_slab)
+		return -ENOMEM;
+	return 0;
+}
+
+void amdgpu_fence_slab_fini(void)
+{
+	rcu_barrier();
+	kmem_cache_destroy(amdgpu_fence_slab);
+}
+/*
+ * Cast helper
+ */
+static const struct dma_fence_ops amdgpu_fence_ops;
+static inline struct amdgpu_fence *to_amdgpu_fence(struct dma_fence *f)
+{
+	struct amdgpu_fence *__f = container_of(f, struct amdgpu_fence, base);
+
+	if (__f->base.ops == &amdgpu_fence_ops)
+		return __f;
+
+	return NULL;
+}
+
+/**
+ * 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 = atomic_read(&drv->last_seq);
+
+	return seq;
+}
+
+/**
+ * amdgpu_fence_emit - emit a fence on the requested ring
+ *
+ * @ring: ring the fence is associated with
+ * @f: resulting 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, struct dma_fence **f,
+		      unsigned flags)
+{
+	struct amdgpu_device *adev = ring->adev;
+	struct amdgpu_fence *fence;
+	struct dma_fence __rcu **ptr;
+	uint32_t seq;
+	int r;
+
+	fence = kmem_cache_alloc(amdgpu_fence_slab, GFP_KERNEL);
+	if (fence == NULL)
+		return -ENOMEM;
+
+	seq = ++ring->fence_drv.sync_seq;
+	fence->ring = ring;
+	dma_fence_init(&fence->base, &amdgpu_fence_ops,
+		       &ring->fence_drv.lock,
+		       adev->fence_context + ring->idx,
+		       seq);
+	amdgpu_ring_emit_fence(ring, ring->fence_drv.gpu_addr,
+			       seq, flags | AMDGPU_FENCE_FLAG_INT);
+	pm_runtime_get_noresume(adev_to_drm(adev)->dev);
+	ptr = &ring->fence_drv.fences[seq & ring->fence_drv.num_fences_mask];
+	if (unlikely(rcu_dereference_protected(*ptr, 1))) {
+		struct dma_fence *old;
+
+		rcu_read_lock();
+		old = dma_fence_get_rcu_safe(ptr);
+		rcu_read_unlock();
+
+		if (old) {
+			r = dma_fence_wait(old, false);
+			dma_fence_put(old);
+			if (r)
+				return r;
+		}
+	}
+
+	/* This function can't be called concurrently anyway, otherwise
+	 * emitting the fence would mess up the hardware ring buffer.
+	 */
+	rcu_assign_pointer(*ptr, dma_fence_get(&fence->base));
+
+	*f = &fence->base;
+
+	return 0;
+}
+
+/**
+ * amdgpu_fence_emit_polling - emit a fence on the requeste ring
+ *
+ * @ring: ring the fence is associated with
+ * @s: resulting sequence number
+ *
+ * Emits a fence command on the requested ring (all asics).
+ * Used For polling fence.
+ * Returns 0 on success, -ENOMEM on failure.
+ */
+int amdgpu_fence_emit_polling(struct amdgpu_ring *ring, uint32_t *s,
+			      uint32_t timeout)
+{
+	uint32_t seq;
+	signed long r;
+
+	if (!s)
+		return -EINVAL;
+
+	seq = ++ring->fence_drv.sync_seq;
+	r = amdgpu_fence_wait_polling(ring,
+				      seq - ring->fence_drv.num_fences_mask,
+				      timeout);
+	if (r < 1)
+		return -ETIMEDOUT;
+
+	amdgpu_ring_emit_fence(ring, ring->fence_drv.gpu_addr,
+			       seq, 0);
+
+	*s = seq;
+
+	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_process - check for fence activity
+ *
+ * @ring: pointer to struct amdgpu_ring
+ *
+ * Checks the current fence value and calculates the last
+ * signalled fence value. Wakes the fence queue if the
+ * sequence number has increased.
+ *
+ * Returns true if fence was processed
+ */
+bool amdgpu_fence_process(struct amdgpu_ring *ring)
+{
+	struct amdgpu_fence_driver *drv = &ring->fence_drv;
+	struct amdgpu_device *adev = ring->adev;
+	uint32_t seq, last_seq;
+	int r;
+
+	do {
+		last_seq = atomic_read(&ring->fence_drv.last_seq);
+		seq = amdgpu_fence_read(ring);
+
+	} while (atomic_cmpxchg(&drv->last_seq, last_seq, seq) != last_seq);
+
+	if (del_timer(&ring->fence_drv.fallback_timer) &&
+	    seq != ring->fence_drv.sync_seq)
+		amdgpu_fence_schedule_fallback(ring);
+
+	if (unlikely(seq == last_seq))
+		return false;
+
+	last_seq &= drv->num_fences_mask;
+	seq &= drv->num_fences_mask;
+
+	do {
+		struct dma_fence *fence, **ptr;
+
+		++last_seq;
+		last_seq &= drv->num_fences_mask;
+		ptr = &drv->fences[last_seq];
+
+		/* There is always exactly one thread signaling this fence slot */
+		fence = rcu_dereference_protected(*ptr, 1);
+		RCU_INIT_POINTER(*ptr, NULL);
+
+		if (!fence)
+			continue;
+
+		r = dma_fence_signal(fence);
+		if (!r)
+			DMA_FENCE_TRACE(fence, "signaled from irq context\n");
+		else
+			BUG();
+
+		dma_fence_put(fence);
+		pm_runtime_mark_last_busy(adev_to_drm(adev)->dev);
+		pm_runtime_put_autosuspend(adev_to_drm(adev)->dev);
+	} while (last_seq != seq);
+
+	return true;
+}
+
+/**
+ * amdgpu_fence_fallback - fallback for hardware interrupts
+ *
+ * @work: delayed work item
+ *
+ * Checks for fence activity.
+ */
+static void amdgpu_fence_fallback(struct timer_list *t)
+{
+	struct amdgpu_ring *ring = from_timer(ring, t,
+					      fence_drv.fallback_timer);
+
+	if (amdgpu_fence_process(ring))
+		DRM_WARN("Fence fallback timer expired on ring %s\n", ring->name);
+}
+
+/**
+ * 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.
+ */
+int amdgpu_fence_wait_empty(struct amdgpu_ring *ring)
+{
+	uint64_t seq = READ_ONCE(ring->fence_drv.sync_seq);
+	struct dma_fence *fence, **ptr;
+	int r;
+
+	if (!seq)
+		return 0;
+
+	ptr = &ring->fence_drv.fences[seq & ring->fence_drv.num_fences_mask];
+	rcu_read_lock();
+	fence = rcu_dereference(*ptr);
+	if (!fence || !dma_fence_get_rcu(fence)) {
+		rcu_read_unlock();
+		return 0;
+	}
+	rcu_read_unlock();
+
+	r = dma_fence_wait(fence, false);
+	dma_fence_put(fence);
+	return r;
+}
+
+/**
+ * amdgpu_fence_wait_polling - busy wait for givn sequence number
+ *
+ * @ring: ring index the fence is associated with
+ * @wait_seq: sequence number to wait
+ * @timeout: the timeout for waiting in usecs
+ *
+ * Wait for all fences on the requested ring to signal (all asics).
+ * Returns left time if no timeout, 0 or minus if timeout.
+ */
+signed long amdgpu_fence_wait_polling(struct amdgpu_ring *ring,
+				      uint32_t wait_seq,
+				      signed long timeout)
+{
+	uint32_t seq;
+
+	do {
+		seq = amdgpu_fence_read(ring);
+		udelay(5);
+		timeout -= 5;
+	} while ((int32_t)(wait_seq - seq) > 0 && timeout > 0);
+
+	return timeout > 0 ? timeout : 0;
+}
+/**
+ * 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 = 0x100000000ull;
+	emitted -= atomic_read(&ring->fence_drv.last_seq);
+	emitted += READ_ONCE(ring->fence_drv.sync_seq);
+	return lower_32_bits(emitted);
+}
+
+/**
+ * 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->funcs->type != AMDGPU_RING_TYPE_UVD) {
+		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.inst[ring->me].cpu_addr + index;
+		ring->fence_drv.gpu_addr = adev->uvd.inst[ring->me].gpu_addr + index;
+	}
+	amdgpu_fence_write(ring, atomic_read(&ring->fence_drv.last_seq));
+
+	if (irq_src)
+		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;
+
+	DRM_DEV_DEBUG(adev->dev, "fence driver on ring %s use gpu addr 0x%016llx\n",
+		      ring->name, ring->fence_drv.gpu_addr);
+	return 0;
+}
+
+/**
+ * amdgpu_fence_driver_init_ring - init the fence driver
+ * for the requested ring.
+ *
+ * @ring: ring to init the fence driver on
+ * @num_hw_submission: number of entries on the hardware queue
+ *
+ * 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,
+				  unsigned num_hw_submission)
+{
+	struct amdgpu_device *adev = ring->adev;
+	long timeout;
+	int r;
+
+	if (!adev)
+		return -EINVAL;
+
+	if (!is_power_of_2(num_hw_submission))
+		return -EINVAL;
+
+	ring->fence_drv.cpu_addr = NULL;
+	ring->fence_drv.gpu_addr = 0;
+	ring->fence_drv.sync_seq = 0;
+	atomic_set(&ring->fence_drv.last_seq, 0);
+	ring->fence_drv.initialized = false;
+
+	timer_setup(&ring->fence_drv.fallback_timer, amdgpu_fence_fallback, 0);
+
+	ring->fence_drv.num_fences_mask = num_hw_submission * 2 - 1;
+	spin_lock_init(&ring->fence_drv.lock);
+	ring->fence_drv.fences = kcalloc(num_hw_submission * 2, sizeof(void *),
+					 GFP_KERNEL);
+	if (!ring->fence_drv.fences)
+		return -ENOMEM;
+
+	/* No need to setup the GPU scheduler for rings that don't need it */
+	if (!ring->no_scheduler) {
+		switch (ring->funcs->type) {
+		case AMDGPU_RING_TYPE_GFX:
+			timeout = adev->gfx_timeout;
+			break;
+		case AMDGPU_RING_TYPE_COMPUTE:
+			timeout = adev->compute_timeout;
+			break;
+		case AMDGPU_RING_TYPE_SDMA:
+			timeout = adev->sdma_timeout;
+			break;
+		default:
+			timeout = adev->video_timeout;
+			break;
+		}
+
+		r = drm_sched_init(&ring->sched, &amdgpu_sched_ops,
+				   num_hw_submission, amdgpu_job_hang_limit,
+				   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)
+{
+	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)
+{
+	unsigned i, j;
+	int r;
+
+	for (i = 0; i < AMDGPU_MAX_RINGS; i++) {
+		struct amdgpu_ring *ring = adev->rings[i];
+
+		if (!ring || !ring->fence_drv.initialized)
+			continue;
+		if (!ring->no_scheduler)
+			drm_sched_fini(&ring->sched);
+		r = amdgpu_fence_wait_empty(ring);
+		if (r) {
+			/* no need to trigger GPU reset as we are unloading */
+			amdgpu_fence_driver_force_completion(ring);
+		}
+		if (ring->fence_drv.irq_src)
+			amdgpu_irq_put(adev, ring->fence_drv.irq_src,
+				       ring->fence_drv.irq_type);
+
+		del_timer_sync(&ring->fence_drv.fallback_timer);
+		for (j = 0; j <= ring->fence_drv.num_fences_mask; ++j)
+			dma_fence_put(ring->fence_drv.fences[j]);
+		kfree(ring->fence_drv.fences);
+		ring->fence_drv.fences = NULL;
+		ring->fence_drv.initialized = false;
+	}
+}
+
+/**
+ * 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;
+
+	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(ring);
+		}
+
+		/* disable the interrupt */
+		if (ring->fence_drv.irq_src)
+			amdgpu_irq_put(adev, ring->fence_drv.irq_src,
+				       ring->fence_drv.irq_type);
+	}
+}
+
+/**
+ * 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;
+
+	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 */
+		if (ring->fence_drv.irq_src)
+			amdgpu_irq_get(adev, ring->fence_drv.irq_src,
+				       ring->fence_drv.irq_type);
+	}
+}
+
+/**
+ * amdgpu_fence_driver_force_completion - force signal latest fence of ring
+ *
+ * @ring: fence of the ring to signal
+ *
+ */
+void amdgpu_fence_driver_force_completion(struct amdgpu_ring *ring)
+{
+	amdgpu_fence_write(ring, ring->fence_drv.sync_seq);
+	amdgpu_fence_process(ring);
+}
+
+/*
+ * Common fence implementation
+ */
+
+static const char *amdgpu_fence_get_driver_name(struct dma_fence *fence)
+{
+	return "amdgpu";
+}
+
+static const char *amdgpu_fence_get_timeline_name(struct dma_fence *f)
+{
+	struct amdgpu_fence *fence = to_amdgpu_fence(f);
+	return (const char *)fence->ring->name;
+}
+
+/**
+ * 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 dma_fence *f)
+{
+	struct amdgpu_fence *fence = to_amdgpu_fence(f);
+	struct amdgpu_ring *ring = fence->ring;
+
+	if (!timer_pending(&ring->fence_drv.fallback_timer))
+		amdgpu_fence_schedule_fallback(ring);
+
+	DMA_FENCE_TRACE(&fence->base, "armed on ring %i!\n", ring->idx);
+
+	return true;
+}
+
+/**
+ * amdgpu_fence_free - free up the fence memory
+ *
+ * @rcu: RCU callback head
+ *
+ * Free up the fence memory after the RCU grace period.
+ */
+static void amdgpu_fence_free(struct rcu_head *rcu)
+{
+	struct dma_fence *f = container_of(rcu, struct dma_fence, rcu);
+	struct amdgpu_fence *fence = to_amdgpu_fence(f);
+	kmem_cache_free(amdgpu_fence_slab, fence);
+}
+
+/**
+ * amdgpu_fence_release - callback that fence can be freed
+ *
+ * @fence: fence
+ *
+ * This function is called when the reference count becomes zero.
+ * It just RCU schedules freeing up the fence.
+ */
+static void amdgpu_fence_release(struct dma_fence *f)
+{
+	call_rcu(&f->rcu, amdgpu_fence_free);
+}
+
+static const struct dma_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,
+	.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 = drm_to_adev(dev);
+	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_process(ring);
+
+		seq_printf(m, "--- ring %d (%s) ---\n", i, ring->name);
+		seq_printf(m, "Last signaled fence          0x%08x\n",
+			   atomic_read(&ring->fence_drv.last_seq));
+		seq_printf(m, "Last emitted                 0x%08x\n",
+			   ring->fence_drv.sync_seq);
+
+		if (ring->funcs->type == AMDGPU_RING_TYPE_GFX ||
+		    ring->funcs->type == AMDGPU_RING_TYPE_SDMA) {
+			seq_printf(m, "Last signaled trailing fence 0x%08x\n",
+				   le32_to_cpu(*ring->trail_fence_cpu_addr));
+			seq_printf(m, "Last emitted                 0x%08x\n",
+				   ring->trail_seq);
+		}
+
+		if (ring->funcs->type != AMDGPU_RING_TYPE_GFX)
+			continue;
+
+		/* set in CP_VMID_PREEMPT and preemption occurred */
+		seq_printf(m, "Last preempted               0x%08x\n",
+			   le32_to_cpu(*(ring->fence_drv.cpu_addr + 2)));
+		/* set in CP_VMID_RESET and reset occurred */
+		seq_printf(m, "Last reset                   0x%08x\n",
+			   le32_to_cpu(*(ring->fence_drv.cpu_addr + 4)));
+		/* Both preemption and reset occurred */
+		seq_printf(m, "Last both                    0x%08x\n",
+			   le32_to_cpu(*(ring->fence_drv.cpu_addr + 6)));
+	}
+	return 0;
+}
+
+/**
+ * amdgpu_debugfs_gpu_recover - manually trigger a gpu reset & recover
+ *
+ * Manually trigger a gpu reset at the next fence wait.
+ */
+static int amdgpu_debugfs_gpu_recover(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 = drm_to_adev(dev);
+	int r;
+
+	r = pm_runtime_get_sync(dev->dev);
+	if (r < 0) {
+		pm_runtime_put_autosuspend(dev->dev);
+		return 0;
+	}
+
+	seq_printf(m, "gpu recover\n");
+	amdgpu_device_gpu_recover(adev, NULL);
+
+	pm_runtime_mark_last_busy(dev->dev);
+	pm_runtime_put_autosuspend(dev->dev);
+
+	return 0;
+}
+
+static const struct drm_info_list amdgpu_debugfs_fence_list[] = {
+	{"amdgpu_fence_info", &amdgpu_debugfs_fence_info, 0, NULL},
+	{"amdgpu_gpu_recover", &amdgpu_debugfs_gpu_recover, 0, NULL}
+};
+
+static const struct drm_info_list amdgpu_debugfs_fence_list_sriov[] = {
+	{"amdgpu_fence_info", &amdgpu_debugfs_fence_info, 0, NULL},
+};
+#endif
+
+int amdgpu_debugfs_fence_init(struct amdgpu_device *adev)
+{
+#if defined(CONFIG_DEBUG_FS)
+	if (amdgpu_sriov_vf(adev))
+		return amdgpu_debugfs_add_files(adev, amdgpu_debugfs_fence_list_sriov,
+						ARRAY_SIZE(amdgpu_debugfs_fence_list_sriov));
+	return amdgpu_debugfs_add_files(adev, amdgpu_debugfs_fence_list,
+					ARRAY_SIZE(amdgpu_debugfs_fence_list));
+#else
+	return 0;
+#endif
+}
+