drm/amdgpu: add core driver (v4)

This adds the non-asic specific core driver code.

v2: remove extra kconfig option
v3: implement minor fixes from Fengguang Wu
v4: fix cast in amdgpu_ucode.c

Acked-by: Christian König <christian.koenig@amd.com>
Acked-by: Jammy Zhou <Jammy.Zhou@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 161 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 000000000000..235010a83f8f
--- /dev/null
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ctx.c
@@ -0,0 +1,161 @@
+/*
+ * 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;
+
+	mutex_lock(&mgr->hlock);
+	idr_remove(&mgr->ctx_handles, ctx->id);
+	mutex_unlock(&mgr->hlock);
+	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->hlock);
+	r = idr_alloc(&mgr->ctx_handles, ctx, 0, 0, GFP_KERNEL);
+	if (r < 0) {
+		mutex_unlock(&mgr->hlock);
+		kfree(ctx);
+		return r;
+	}
+	mutex_unlock(&mgr->hlock);
+	*id = (uint32_t)r;
+
+	memset(ctx, 0, sizeof(*ctx));
+	ctx->id = *id;
+	ctx->fpriv = fpriv;
+	kref_init(&ctx->refcount);
+
+	return 0;
+}
+
+int amdgpu_ctx_free(struct amdgpu_device *adev, struct amdgpu_fpriv *fpriv, uint32_t id)
+{
+	int r;
+	struct amdgpu_ctx *ctx;
+	struct amdgpu_ctx_mgr *mgr = &fpriv->ctx_mgr;
+
+	rcu_read_lock();
+	ctx = idr_find(&mgr->ctx_handles, id);
+	rcu_read_unlock();
+	if (ctx) {
+		/* if no task is pending on this context, free it */
+		r = kref_put(&ctx->refcount, amdgpu_ctx_do_release);
+		if (r == 1)
+			return 0;//context is removed successfully
+		else {
+			/* context is still in using */
+			kref_get(&ctx->refcount);
+			return -ERESTARTSYS;
+		}
+	}
+	return -EINVAL;
+}
+
+int amdgpu_ctx_query(struct amdgpu_device *adev, struct amdgpu_fpriv *fpriv, uint32_t id, struct amdgpu_ctx_state *state)
+{
+	struct amdgpu_ctx *ctx;
+	struct amdgpu_ctx_mgr *mgr = &fpriv->ctx_mgr;
+
+	rcu_read_lock();
+	ctx = idr_find(&mgr->ctx_handles, id);
+	rcu_read_unlock();
+	if (ctx) {
+		/* state should alter with CS activity */
+		*state = ctx->state;
+		return 0;
+	}
+	return -EINVAL;
+}
+
+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->hlock);
+}
+
+int amdgpu_ctx_ioctl(struct drm_device *dev, void *data,
+							struct drm_file *filp)
+{
+	int r;
+	uint32_t id;
+	uint32_t flags;
+	struct amdgpu_ctx_state state;
+
+	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, &state);
+			if (r == 0) {
+				args->out.state.flags = state.flags;
+				args->out.state.hangs = state.hangs;
+			}
+			break;
+		default:
+			return -EINVAL;
+	}
+
+	return r;
+}