Linux-libre 4.2-gnu

1 files changed, 193 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..6c66ac8a1
--- /dev/null
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c
@@ -0,0 +1,193 @@
+/*
+ * 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 "amdgpu.h"
+
+static void amdgpu_ctx_do_release(struct kref *ref)
+{
+	struct amdgpu_ctx *ctx;
+	struct amdgpu_ctx_mgr *mgr;
+
+	ctx = container_of(ref, struct amdgpu_ctx, refcount);
+	mgr = &ctx->fpriv->ctx_mgr;
+
+	idr_remove(&mgr->ctx_handles, ctx->id);
+	kfree(ctx);
+}
+
+int amdgpu_ctx_alloc(struct amdgpu_device *adev, struct amdgpu_fpriv *fpriv, uint32_t *id, uint32_t flags)
+{
+	int r;
+	struct amdgpu_ctx *ctx;
+	struct amdgpu_ctx_mgr *mgr = &fpriv->ctx_mgr;
+
+	ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
+	if (!ctx)
+		return -ENOMEM;
+
+	mutex_lock(&mgr->lock);
+	r = idr_alloc(&mgr->ctx_handles, ctx, 0, 0, GFP_KERNEL);
+	if (r < 0) {
+		mutex_unlock(&mgr->lock);
+		kfree(ctx);
+		return r;
+	}
+	*id = (uint32_t)r;
+
+	memset(ctx, 0, sizeof(*ctx));
+	ctx->id = *id;
+	ctx->fpriv = fpriv;
+	kref_init(&ctx->refcount);
+	mutex_unlock(&mgr->lock);
+
+	return 0;
+}
+
+int amdgpu_ctx_free(struct amdgpu_device *adev, struct amdgpu_fpriv *fpriv, uint32_t id)
+{
+	struct amdgpu_ctx *ctx;
+	struct amdgpu_ctx_mgr *mgr = &fpriv->ctx_mgr;
+
+	mutex_lock(&mgr->lock);
+	ctx = idr_find(&mgr->ctx_handles, id);
+	if (ctx) {
+		kref_put(&ctx->refcount, amdgpu_ctx_do_release);
+		mutex_unlock(&mgr->lock);
+		return 0;
+	}
+	mutex_unlock(&mgr->lock);
+	return -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 = &fpriv->ctx_mgr;
+	unsigned reset_counter;
+
+	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 = ctx->state.flags;
+	out->state.hangs = ctx->state.hangs;
+
+	/* 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 == reset_counter)
+		out->state.reset_status = AMDGPU_CTX_NO_RESET;
+	else
+		out->state.reset_status = AMDGPU_CTX_UNKNOWN_RESET;
+	ctx->reset_counter = reset_counter;
+
+	mutex_unlock(&mgr->lock);
+	return 0;
+}
+
+void amdgpu_ctx_fini(struct amdgpu_fpriv *fpriv)
+{
+	struct idr *idp;
+	struct amdgpu_ctx *ctx;
+	uint32_t id;
+	struct amdgpu_ctx_mgr *mgr = &fpriv->ctx_mgr;
+	idp = &mgr->ctx_handles;
+
+	idr_for_each_entry(idp,ctx,id) {
+		if (kref_put(&ctx->refcount, amdgpu_ctx_do_release) != 1)
+			DRM_ERROR("ctx (id=%ul) is still alive\n",ctx->id);
+	}
+
+	mutex_destroy(&mgr->lock);
+}
+
+int amdgpu_ctx_ioctl(struct drm_device *dev, void *data,
+		     struct drm_file *filp)
+{
+	int r;
+	uint32_t id;
+	uint32_t flags;
+
+	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;
+	flags = args->in.flags;
+
+	switch (args->in.op) {
+		case AMDGPU_CTX_OP_ALLOC_CTX:
+			r = amdgpu_ctx_alloc(adev, fpriv, &id, flags);
+			args->out.alloc.ctx_id = id;
+			break;
+		case AMDGPU_CTX_OP_FREE_CTX:
+			r = amdgpu_ctx_free(adev, fpriv, id);
+			break;
+		case AMDGPU_CTX_OP_QUERY_STATE:
+			r = amdgpu_ctx_query(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 = &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)
+{
+	struct amdgpu_fpriv *fpriv;
+	struct amdgpu_ctx_mgr *mgr;
+
+	if (ctx == NULL)
+		return -EINVAL;
+
+	fpriv = ctx->fpriv;
+	mgr = &fpriv->ctx_mgr;
+	mutex_lock(&mgr->lock);
+	kref_put(&ctx->refcount, amdgpu_ctx_do_release);
+	mutex_unlock(&mgr->lock);
+
+	return 0;
+}