1 files changed, 517 insertions, 0 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c
new file mode 100644
index 000000000..df6965761
--- /dev/null
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c
@@ -0,0 +1,517 @@
+/*
+ * Copyright 2015 Advanced Micro Devices, Inc.
+ *
+ * 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, sublicense,
+ * 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 above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * 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 NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) 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.
+ *
+ * Authors: monk liu <monk.liu@amd.com>
+ */
+
+#include <drm/drmP.h>
+#include <drm/drm_auth.h>
+#include "amdgpu.h"
+#include "amdgpu_sched.h"
+
+static int amdgpu_ctx_priority_permit(struct drm_file *filp,
+				      enum drm_sched_priority priority)
+{
+	/* NORMAL and below are accessible by everyone */
+	if (priority <= DRM_SCHED_PRIORITY_NORMAL)
+		return 0;
+
+	if (capable(CAP_SYS_NICE))
+		return 0;
+
+	if (drm_is_current_master(filp))
+		return 0;
+
+	return -EACCES;
+}
+
+static int amdgpu_ctx_init(struct amdgpu_device *adev,
+			   enum drm_sched_priority priority,
+			   struct drm_file *filp,
+			   struct amdgpu_ctx *ctx)
+{
+	unsigned i, j;
+	int r;
+
+	if (priority < 0 || priority >= DRM_SCHED_PRIORITY_MAX)
+		return -EINVAL;
+
+	r = amdgpu_ctx_priority_permit(filp, priority);
+	if (r)
+		return r;
+
+	memset(ctx, 0, sizeof(*ctx));
+	ctx->adev = adev;
+	kref_init(&ctx->refcount);
+	spin_lock_init(&ctx->ring_lock);
+	ctx->fences = kcalloc(amdgpu_sched_jobs * AMDGPU_MAX_RINGS,
+			      sizeof(struct dma_fence*), GFP_KERNEL);
+	if (!ctx->fences)
+		return -ENOMEM;
+
+	mutex_init(&ctx->lock);
+
+	for (i = 0; i < AMDGPU_MAX_RINGS; ++i) {
+		ctx->rings[i].sequence = 1;
+		ctx->rings[i].fences = &ctx->fences[amdgpu_sched_jobs * i];
+	}
+
+	ctx->reset_counter = atomic_read(&adev->gpu_reset_counter);
+	ctx->reset_counter_query = ctx->reset_counter;
+	ctx->vram_lost_counter = atomic_read(&adev->vram_lost_counter);
+	ctx->init_priority = priority;
+	ctx->override_priority = DRM_SCHED_PRIORITY_UNSET;
+
+	/* create context entity for each ring */
+	for (i = 0; i < adev->num_rings; i++) {
+		struct amdgpu_ring *ring = adev->rings[i];
+		struct drm_sched_rq *rq;
+
+		rq = &ring->sched.sched_rq[priority];
+
+		if (ring == &adev->gfx.kiq.ring)
+			continue;
+
+		r = drm_sched_entity_init(&ctx->rings[i].entity,
+					  &rq, 1, &ctx->guilty);
+		if (r)
+			goto failed;
+	}
+
+	r = amdgpu_queue_mgr_init(adev, &ctx->queue_mgr);
+	if (r)
+		goto failed;
+
+	return 0;
+
+failed:
+	for (j = 0; j < i; j++)
+		drm_sched_entity_destroy(&ctx->rings[j].entity);
+	kfree(ctx->fences);
+	ctx->fences = NULL;
+	return r;
+}
+
+static void amdgpu_ctx_fini(struct kref *ref)
+{
+	struct amdgpu_ctx *ctx = container_of(ref, struct amdgpu_ctx, refcount);
+	struct amdgpu_device *adev = ctx->adev;
+	unsigned i, j;
+
+	if (!adev)
+		return;
+
+	for (i = 0; i < AMDGPU_MAX_RINGS; ++i)
+		for (j = 0; j < amdgpu_sched_jobs; ++j)
+			dma_fence_put(ctx->rings[i].fences[j]);
+	kfree(ctx->fences);
+	ctx->fences = NULL;
+
+	amdgpu_queue_mgr_fini(adev, &ctx->queue_mgr);
+
+	mutex_destroy(&ctx->lock);
+
+	kfree(ctx);
+}
+
+static int amdgpu_ctx_alloc(struct amdgpu_device *adev,
+			    struct amdgpu_fpriv *fpriv,
+			    struct drm_file *filp,
+			    enum drm_sched_priority priority,
+			    uint32_t *id)
+{
+	struct amdgpu_ctx_mgr *mgr = &fpriv->ctx_mgr;
+	struct amdgpu_ctx *ctx;
+	int r;
+
+	ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
+	if (!ctx)
+		return -ENOMEM;
+
+	mutex_lock(&mgr->lock);
+	r = idr_alloc(&mgr->ctx_handles, ctx, 1, 0, GFP_KERNEL);
+	if (r < 0) {
+		mutex_unlock(&mgr->lock);
+		kfree(ctx);
+		return r;
+	}
+
+	*id = (uint32_t)r;
+	r = amdgpu_ctx_init(adev, priority, filp, ctx);
+	if (r) {
+		idr_remove(&mgr->ctx_handles, *id);
+		*id = 0;
+		kfree(ctx);
+	}
+	mutex_unlock(&mgr->lock);
+	return r;
+}
+
+static void amdgpu_ctx_do_release(struct kref *ref)
+{
+	struct amdgpu_ctx *ctx;
+	u32 i;
+
+	ctx = container_of(ref, struct amdgpu_ctx, refcount);
+
+	for (i = 0; i < ctx->adev->num_rings; i++) {
+
+		if (ctx->adev->rings[i] == &ctx->adev->gfx.kiq.ring)
+			continue;
+
+		drm_sched_entity_destroy(&ctx->rings[i].entity);
+	}
+
+	amdgpu_ctx_fini(ref);
+}
+
+static int amdgpu_ctx_free(struct amdgpu_fpriv *fpriv, uint32_t id)
+{
+	struct amdgpu_ctx_mgr *mgr = &fpriv->ctx_mgr;
+	struct amdgpu_ctx *ctx;
+
+	mutex_lock(&mgr->lock);
+	ctx = idr_remove(&mgr->ctx_handles, id);
+	if (ctx)
+		kref_put(&ctx->refcount, amdgpu_ctx_do_release);
+	mutex_unlock(&mgr->lock);
+	return ctx ? 0 : -EINVAL;
+}
+
+static int amdgpu_ctx_query(struct amdgpu_device *adev,
+			    struct amdgpu_fpriv *fpriv, uint32_t id,
+			    union drm_amdgpu_ctx_out *out)
+{
+	struct amdgpu_ctx *ctx;
+	struct amdgpu_ctx_mgr *mgr;
+	unsigned reset_counter;
+
+	if (!fpriv)
+		return -EINVAL;
+
+	mgr = &fpriv->ctx_mgr;
+	mutex_lock(&mgr->lock);
+	ctx = idr_find(&mgr->ctx_handles, id);
+	if (!ctx) {
+		mutex_unlock(&mgr->lock);
+		return -EINVAL;
+	}
+
+	/* TODO: these two are always zero */
+	out->state.flags = 0x0;
+	out->state.hangs = 0x0;
+
+	/* determine if a GPU reset has occured since the last call */
+	reset_counter = atomic_read(&adev->gpu_reset_counter);
+	/* TODO: this should ideally return NO, GUILTY, or INNOCENT. */
+	if (ctx->reset_counter_query == reset_counter)
+		out->state.reset_status = AMDGPU_CTX_NO_RESET;
+	else
+		out->state.reset_status = AMDGPU_CTX_UNKNOWN_RESET;
+	ctx->reset_counter_query = reset_counter;
+
+	mutex_unlock(&mgr->lock);
+	return 0;
+}
+
+static int amdgpu_ctx_query2(struct amdgpu_device *adev,
+	struct amdgpu_fpriv *fpriv, uint32_t id,
+	union drm_amdgpu_ctx_out *out)
+{
+	struct amdgpu_ctx *ctx;
+	struct amdgpu_ctx_mgr *mgr;
+
+	if (!fpriv)
+		return -EINVAL;
+
+	mgr = &fpriv->ctx_mgr;
+	mutex_lock(&mgr->lock);
+	ctx = idr_find(&mgr->ctx_handles, id);
+	if (!ctx) {
+		mutex_unlock(&mgr->lock);
+		return -EINVAL;
+	}
+
+	out->state.flags = 0x0;
+	out->state.hangs = 0x0;
+
+	if (ctx->reset_counter != atomic_read(&adev->gpu_reset_counter))
+		out->state.flags |= AMDGPU_CTX_QUERY2_FLAGS_RESET;
+
+	if (ctx->vram_lost_counter != atomic_read(&adev->vram_lost_counter))
+		out->state.flags |= AMDGPU_CTX_QUERY2_FLAGS_VRAMLOST;
+
+	if (atomic_read(&ctx->guilty))
+		out->state.flags |= AMDGPU_CTX_QUERY2_FLAGS_GUILTY;
+
+	mutex_unlock(&mgr->lock);
+	return 0;
+}
+
+int amdgpu_ctx_ioctl(struct drm_device *dev, void *data,
+		     struct drm_file *filp)
+{
+	int r;
+	uint32_t id;
+	enum drm_sched_priority priority;
+
+	union drm_amdgpu_ctx *args = data;
+	struct amdgpu_device *adev = dev->dev_private;
+	struct amdgpu_fpriv *fpriv = filp->driver_priv;
+
+	r = 0;
+	id = args->in.ctx_id;
+	priority = amdgpu_to_sched_priority(args->in.priority);
+
+	/* For backwards compatibility reasons, we need to accept
+	 * ioctls with garbage in the priority field */
+	if (priority == DRM_SCHED_PRIORITY_INVALID)
+		priority = DRM_SCHED_PRIORITY_NORMAL;
+
+	switch (args->in.op) {
+	case AMDGPU_CTX_OP_ALLOC_CTX:
+		r = amdgpu_ctx_alloc(adev, fpriv, filp, priority, &id);
+		args->out.alloc.ctx_id = id;
+		break;
+	case AMDGPU_CTX_OP_FREE_CTX:
+		r = amdgpu_ctx_free(fpriv, id);
+		break;
+	case AMDGPU_CTX_OP_QUERY_STATE:
+		r = amdgpu_ctx_query(adev, fpriv, id, &args->out);
+		break;
+	case AMDGPU_CTX_OP_QUERY_STATE2:
+		r = amdgpu_ctx_query2(adev, fpriv, id, &args->out);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	return r;
+}
+
+struct amdgpu_ctx *amdgpu_ctx_get(struct amdgpu_fpriv *fpriv, uint32_t id)
+{
+	struct amdgpu_ctx *ctx;
+	struct amdgpu_ctx_mgr *mgr;
+
+	if (!fpriv)
+		return NULL;
+
+	mgr = &fpriv->ctx_mgr;
+
+	mutex_lock(&mgr->lock);
+	ctx = idr_find(&mgr->ctx_handles, id);
+	if (ctx)
+		kref_get(&ctx->refcount);
+	mutex_unlock(&mgr->lock);
+	return ctx;
+}
+
+int amdgpu_ctx_put(struct amdgpu_ctx *ctx)
+{
+	if (ctx == NULL)
+		return -EINVAL;
+
+	kref_put(&ctx->refcount, amdgpu_ctx_do_release);
+	return 0;
+}
+
+int amdgpu_ctx_add_fence(struct amdgpu_ctx *ctx, struct amdgpu_ring *ring,
+			      struct dma_fence *fence, uint64_t* handler)
+{
+	struct amdgpu_ctx_ring *cring = & ctx->rings[ring->idx];
+	uint64_t seq = cring->sequence;
+	unsigned idx = 0;
+	struct dma_fence *other = NULL;
+
+	idx = seq & (amdgpu_sched_jobs - 1);
+	other = cring->fences[idx];
+	if (other)
+		BUG_ON(!dma_fence_is_signaled(other));
+
+	dma_fence_get(fence);
+
+	spin_lock(&ctx->ring_lock);
+	cring->fences[idx] = fence;
+	cring->sequence++;
+	spin_unlock(&ctx->ring_lock);
+
+	dma_fence_put(other);
+	if (handler)
+		*handler = seq;
+
+	return 0;
+}
+
+struct dma_fence *amdgpu_ctx_get_fence(struct amdgpu_ctx *ctx,
+				       struct amdgpu_ring *ring, uint64_t seq)
+{
+	struct amdgpu_ctx_ring *cring = & ctx->rings[ring->idx];
+	struct dma_fence *fence;
+
+	spin_lock(&ctx->ring_lock);
+
+	if (seq == ~0ull)
+		seq = ctx->rings[ring->idx].sequence - 1;
+
+	if (seq >= cring->sequence) {
+		spin_unlock(&ctx->ring_lock);
+		return ERR_PTR(-EINVAL);
+	}
+
+
+	if (seq + amdgpu_sched_jobs < cring->sequence) {
+		spin_unlock(&ctx->ring_lock);
+		return NULL;
+	}
+
+	fence = dma_fence_get(cring->fences[seq & (amdgpu_sched_jobs - 1)]);
+	spin_unlock(&ctx->ring_lock);
+
+	return fence;
+}
+
+void amdgpu_ctx_priority_override(struct amdgpu_ctx *ctx,
+				  enum drm_sched_priority priority)
+{
+	int i;
+	struct amdgpu_device *adev = ctx->adev;
+	struct drm_sched_rq *rq;
+	struct drm_sched_entity *entity;
+	struct amdgpu_ring *ring;
+	enum drm_sched_priority ctx_prio;
+
+	ctx->override_priority = priority;
+
+	ctx_prio = (ctx->override_priority == DRM_SCHED_PRIORITY_UNSET) ?
+			ctx->init_priority : ctx->override_priority;
+
+	for (i = 0; i < adev->num_rings; i++) {
+		ring = adev->rings[i];
+		entity = &ctx->rings[i].entity;
+		rq = &ring->sched.sched_rq[ctx_prio];
+
+		if (ring->funcs->type == AMDGPU_RING_TYPE_KIQ)
+			continue;
+
+		drm_sched_entity_set_rq(entity, rq);
+	}
+}
+
+int amdgpu_ctx_wait_prev_fence(struct amdgpu_ctx *ctx, unsigned ring_id)
+{
+	struct amdgpu_ctx_ring *cring = &ctx->rings[ring_id];
+	unsigned idx = cring->sequence & (amdgpu_sched_jobs - 1);
+	struct dma_fence *other = cring->fences[idx];
+
+	if (other) {
+		signed long r;
+		r = dma_fence_wait(other, true);
+		if (r < 0) {
+			if (r != -ERESTARTSYS)
+				DRM_ERROR("Error (%ld) waiting for fence!\n", r);
+
+			return r;
+		}
+	}
+
+	return 0;
+}
+
+void amdgpu_ctx_mgr_init(struct amdgpu_ctx_mgr *mgr)
+{
+	mutex_init(&mgr->lock);
+	idr_init(&mgr->ctx_handles);
+}
+
+void amdgpu_ctx_mgr_entity_flush(struct amdgpu_ctx_mgr *mgr)
+{
+	struct amdgpu_ctx *ctx;
+	struct idr *idp;
+	uint32_t id, i;
+	long max_wait = MAX_WAIT_SCHED_ENTITY_Q_EMPTY;
+
+	idp = &mgr->ctx_handles;
+
+	mutex_lock(&mgr->lock);
+	idr_for_each_entry(idp, ctx, id) {
+
+		if (!ctx->adev) {
+			mutex_unlock(&mgr->lock);
+			return;
+		}
+
+		for (i = 0; i < ctx->adev->num_rings; i++) {
+
+			if (ctx->adev->rings[i] == &ctx->adev->gfx.kiq.ring)
+				continue;
+
+			max_wait = drm_sched_entity_flush(&ctx->rings[i].entity,
+							  max_wait);
+		}
+	}
+	mutex_unlock(&mgr->lock);
+}
+
+void amdgpu_ctx_mgr_entity_fini(struct amdgpu_ctx_mgr *mgr)
+{
+	struct amdgpu_ctx *ctx;
+	struct idr *idp;
+	uint32_t id, i;
+
+	idp = &mgr->ctx_handles;
+
+	idr_for_each_entry(idp, ctx, id) {
+
+		if (!ctx->adev)
+			return;
+
+		for (i = 0; i < ctx->adev->num_rings; i++) {
+
+			if (ctx->adev->rings[i] == &ctx->adev->gfx.kiq.ring)
+				continue;
+
+			if (kref_read(&ctx->refcount) == 1)
+				drm_sched_entity_fini(&ctx->rings[i].entity);
+			else
+				DRM_ERROR("ctx %p is still alive\n", ctx);
+		}
+	}
+}
+
+void amdgpu_ctx_mgr_fini(struct amdgpu_ctx_mgr *mgr)
+{
+	struct amdgpu_ctx *ctx;
+	struct idr *idp;
+	uint32_t id;
+
+	amdgpu_ctx_mgr_entity_fini(mgr);
+
+	idp = &mgr->ctx_handles;
+
+	idr_for_each_entry(idp, ctx, id) {
+		if (kref_put(&ctx->refcount, amdgpu_ctx_fini) != 1)
+			DRM_ERROR("ctx %p is still alive\n", ctx);
+	}
+
+	idr_destroy(&mgr->ctx_handles);
+	mutex_destroy(&mgr->lock);
+}