drm/vmwgfx: Re-implement the stream resource as a simple resource.

Provide and document a reference implementation.

Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Reviewed-by: Sinclair Yeh <syeh@vmware.com>

3 files changed, 169 insertions, 255 deletions

diff --git a/drivers/gpu/drm/vmwgfx/Makefile b/drivers/gpu/drm/vmwgfx/Makefile
index 2258908..aac17a6 100644
--- a/drivers/gpu/drm/vmwgfx/Makefile
+++ b/drivers/gpu/drm/vmwgfx/Makefile
@@ -9,6 +9,6 @@ vmwgfx-y := vmwgfx_execbuf.o vmwgfx_gmr.o vmwgfx_kms.o vmwgfx_drv.o \
 	    vmwgfx_surface.o vmwgfx_prime.o vmwgfx_mob.o vmwgfx_shader.o \
 	    vmwgfx_cmdbuf_res.o vmwgfx_cmdbuf.o vmwgfx_stdu.o \
 	    vmwgfx_cotable.o vmwgfx_so.o vmwgfx_binding.o vmwgfx_msg.o \
-	    vmwgfx_simple_resource.o
+	    vmwgfx_simple_resource.o vmwgfx_va.o
 
 obj-$(CONFIG_DRM_VMWGFX) := vmwgfx.o
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_resource.c b/drivers/gpu/drm/vmwgfx/vmwgfx_resource.c
index 27033d9..fa1037e 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_resource.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_resource.c
@@ -45,31 +45,6 @@ struct vmw_bo_user_rep {
 	uint64_t map_handle;
 };
 
-struct vmw_stream {
-	struct vmw_resource res;
-	uint32_t stream_id;
-};
-
-struct vmw_user_stream {
-	struct ttm_base_object base;
-	struct vmw_stream stream;
-};
-
-
-static uint64_t vmw_user_stream_size;
-
-static const struct vmw_res_func vmw_stream_func = {
-	.res_type = vmw_res_stream,
-	.needs_backup = false,
-	.may_evict = false,
-	.type_name = "video streams",
-	.backup_placement = NULL,
-	.create = NULL,
-	.destroy = NULL,
-	.bind = NULL,
-	.unbind = NULL
-};
-
 static inline struct vmw_dma_buffer *
 vmw_dma_buffer(struct ttm_buffer_object *bo)
 {
@@ -259,24 +234,6 @@ void vmw_resource_activate(struct vmw_resource *res,
 	write_unlock(&dev_priv->resource_lock);
 }
 
-static struct vmw_resource *vmw_resource_lookup(struct vmw_private *dev_priv,
-						struct idr *idr, int id)
-{
-	struct vmw_resource *res;
-
-	read_lock(&dev_priv->resource_lock);
-	res = idr_find(idr, id);
-	if (!res || !res->avail || !kref_get_unless_zero(&res->kref))
-		res = NULL;
-
-	read_unlock(&dev_priv->resource_lock);
-
-	if (unlikely(res == NULL))
-		return NULL;
-
-	return res;
-}
-
 /**
  * vmw_user_resource_lookup_handle - lookup a struct resource from a
  * TTM user-space handle and perform basic type checks
@@ -776,217 +733,6 @@ int vmw_user_dmabuf_reference(struct ttm_object_file *tfile,
 				  TTM_REF_USAGE, NULL);
 }
 
-/*
- * Stream management
- */
-
-static void vmw_stream_destroy(struct vmw_resource *res)
-{
-	struct vmw_private *dev_priv = res->dev_priv;
-	struct vmw_stream *stream;
-	int ret;
-
-	DRM_INFO("%s: unref\n", __func__);
-	stream = container_of(res, struct vmw_stream, res);
-
-	ret = vmw_overlay_unref(dev_priv, stream->stream_id);
-	WARN_ON(ret != 0);
-}
-
-static int vmw_stream_init(struct vmw_private *dev_priv,
-			   struct vmw_stream *stream,
-			   void (*res_free) (struct vmw_resource *res))
-{
-	struct vmw_resource *res = &stream->res;
-	int ret;
-
-	ret = vmw_resource_init(dev_priv, res, false, res_free,
-				&vmw_stream_func);
-
-	if (unlikely(ret != 0)) {
-		if (res_free == NULL)
-			kfree(stream);
-		else
-			res_free(&stream->res);
-		return ret;
-	}
-
-	ret = vmw_overlay_claim(dev_priv, &stream->stream_id);
-	if (ret) {
-		vmw_resource_unreference(&res);
-		return ret;
-	}
-
-	DRM_INFO("%s: claimed\n", __func__);
-
-	vmw_resource_activate(&stream->res, vmw_stream_destroy);
-	return 0;
-}
-
-static void vmw_user_stream_free(struct vmw_resource *res)
-{
-	struct vmw_user_stream *stream =
-	    container_of(res, struct vmw_user_stream, stream.res);
-	struct vmw_private *dev_priv = res->dev_priv;
-
-	ttm_base_object_kfree(stream, base);
-	ttm_mem_global_free(vmw_mem_glob(dev_priv),
-			    vmw_user_stream_size);
-}
-
-/**
- * This function is called when user space has no more references on the
- * base object. It releases the base-object's reference on the resource object.
- */
-
-static void vmw_user_stream_base_release(struct ttm_base_object **p_base)
-{
-	struct ttm_base_object *base = *p_base;
-	struct vmw_user_stream *stream =
-	    container_of(base, struct vmw_user_stream, base);
-	struct vmw_resource *res = &stream->stream.res;
-
-	*p_base = NULL;
-	vmw_resource_unreference(&res);
-}
-
-int vmw_stream_unref_ioctl(struct drm_device *dev, void *data,
-			   struct drm_file *file_priv)
-{
-	struct vmw_private *dev_priv = vmw_priv(dev);
-	struct vmw_resource *res;
-	struct vmw_user_stream *stream;
-	struct drm_vmw_stream_arg *arg = (struct drm_vmw_stream_arg *)data;
-	struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;
-	struct idr *idr = &dev_priv->res_idr[vmw_res_stream];
-	int ret = 0;
-
-
-	res = vmw_resource_lookup(dev_priv, idr, arg->stream_id);
-	if (unlikely(res == NULL))
-		return -EINVAL;
-
-	if (res->res_free != &vmw_user_stream_free) {
-		ret = -EINVAL;
-		goto out;
-	}
-
-	stream = container_of(res, struct vmw_user_stream, stream.res);
-	if (stream->base.tfile != tfile) {
-		ret = -EINVAL;
-		goto out;
-	}
-
-	ttm_ref_object_base_unref(tfile, stream->base.hash.key, TTM_REF_USAGE);
-out:
-	vmw_resource_unreference(&res);
-	return ret;
-}
-
-int vmw_stream_claim_ioctl(struct drm_device *dev, void *data,
-			   struct drm_file *file_priv)
-{
-	struct vmw_private *dev_priv = vmw_priv(dev);
-	struct vmw_user_stream *stream;
-	struct vmw_resource *res;
-	struct vmw_resource *tmp;
-	struct drm_vmw_stream_arg *arg = (struct drm_vmw_stream_arg *)data;
-	struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;
-	int ret;
-
-	/*
-	 * Approximate idr memory usage with 128 bytes. It will be limited
-	 * by maximum number_of streams anyway?
-	 */
-
-	if (unlikely(vmw_user_stream_size == 0))
-		vmw_user_stream_size = ttm_round_pot(sizeof(*stream)) + 128;
-
-	ret = ttm_read_lock(&dev_priv->reservation_sem, true);
-	if (unlikely(ret != 0))
-		return ret;
-
-	ret = ttm_mem_global_alloc(vmw_mem_glob(dev_priv),
-				   vmw_user_stream_size,
-				   false, true);
-	ttm_read_unlock(&dev_priv->reservation_sem);
-	if (unlikely(ret != 0)) {
-		if (ret != -ERESTARTSYS)
-			DRM_ERROR("Out of graphics memory for stream"
-				  " creation.\n");
-
-		goto out_ret;
-	}
-
-	stream = kmalloc(sizeof(*stream), GFP_KERNEL);
-	if (unlikely(stream == NULL)) {
-		ttm_mem_global_free(vmw_mem_glob(dev_priv),
-				    vmw_user_stream_size);
-		ret = -ENOMEM;
-		goto out_ret;
-	}
-
-	res = &stream->stream.res;
-	stream->base.shareable = false;
-	stream->base.tfile = NULL;
-
-	/*
-	 * From here on, the destructor takes over resource freeing.
-	 */
-
-	ret = vmw_stream_init(dev_priv, &stream->stream, vmw_user_stream_free);
-	if (unlikely(ret != 0))
-		goto out_ret;
-
-	tmp = vmw_resource_reference(res);
-	ret = ttm_base_object_init(tfile, &stream->base, false, VMW_RES_STREAM,
-				   &vmw_user_stream_base_release, NULL);
-
-	if (unlikely(ret != 0)) {
-		vmw_resource_unreference(&tmp);
-		goto out_err;
-	}
-
-	arg->stream_id = res->id;
-out_err:
-	vmw_resource_unreference(&res);
-out_ret:
-	return ret;
-}
-
-int vmw_user_stream_lookup(struct vmw_private *dev_priv,
-			   struct ttm_object_file *tfile,
-			   uint32_t *inout_id, struct vmw_resource **out)
-{
-	struct vmw_user_stream *stream;
-	struct vmw_resource *res;
-	int ret;
-
-	res = vmw_resource_lookup(dev_priv, &dev_priv->res_idr[vmw_res_stream],
-				  *inout_id);
-	if (unlikely(res == NULL))
-		return -EINVAL;
-
-	if (res->res_free != &vmw_user_stream_free) {
-		ret = -EINVAL;
-		goto err_ref;
-	}
-
-	stream = container_of(res, struct vmw_user_stream, stream.res);
-	if (stream->base.tfile != tfile) {
-		ret = -EPERM;
-		goto err_ref;
-	}
-
-	*inout_id = stream->stream.stream_id;
-	*out = res;
-	return 0;
-err_ref:
-	vmw_resource_unreference(&res);
-	return ret;
-}
-
-
 /**
  * vmw_dumb_create - Create a dumb kms buffer
  *
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_va.c b/drivers/gpu/drm/vmwgfx/vmwgfx_va.c
new file mode 100644
index 0000000..b4162fd
--- /dev/null
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_va.c
@@ -0,0 +1,168 @@
+/**************************************************************************
+ *
+ * Copyright © 2012-2016 VMware, Inc., Palo Alto, CA., USA
+ * 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 above copyright notice and this permission notice (including the
+ * next paragraph) 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 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.
+ *
+ **************************************************************************/
+
+#include "vmwgfx_drv.h"
+#include "vmwgfx_resource_priv.h"
+
+/**
+ * struct vmw_stream - Overlay stream simple resource.
+ * @sres: The simple resource we derive from.
+ * @stream_id: The overlay stream id.
+ */
+struct vmw_stream {
+	struct vmw_simple_resource sres;
+	u32 stream_id;
+};
+
+/**
+ * vmw_stream - Typecast a struct vmw_resource to a struct vmw_stream.
+ * @res: Pointer to the struct vmw_resource.
+ *
+ * Returns: Returns a pointer to the struct vmw_stream.
+ */
+static struct vmw_stream *
+vmw_stream(struct vmw_resource *res)
+{
+	return container_of(res, struct vmw_stream, sres.res);
+}
+
+/***************************************************************************
+ * Simple resource callbacks for struct vmw_stream
+ **************************************************************************/
+static void vmw_stream_hw_destroy(struct vmw_resource *res)
+{
+	struct vmw_private *dev_priv = res->dev_priv;
+	struct vmw_stream *stream = vmw_stream(res);
+	int ret;
+
+	ret = vmw_overlay_unref(dev_priv, stream->stream_id);
+	WARN_ON_ONCE(ret != 0);
+}
+
+static int vmw_stream_init(struct vmw_resource *res, void *data)
+{
+	struct vmw_stream *stream = vmw_stream(res);
+
+	return vmw_overlay_claim(res->dev_priv, &stream->stream_id);
+}
+
+static void vmw_stream_set_arg_handle(void *data, u32 handle)
+{
+	struct drm_vmw_stream_arg *arg = (struct drm_vmw_stream_arg *)data;
+
+	arg->stream_id = handle;
+}
+
+static const struct vmw_simple_resource_func va_stream_func = {
+	.res_func = {
+		.res_type = vmw_res_stream,
+		.needs_backup = false,
+		.may_evict = false,
+		.type_name = "overlay stream",
+		.backup_placement = NULL,
+		.create = NULL,
+		.destroy = NULL,
+		.bind = NULL,
+		.unbind = NULL
+	},
+	.ttm_res_type = VMW_RES_STREAM,
+	.size = sizeof(struct vmw_stream),
+	.init = vmw_stream_init,
+	.hw_destroy = vmw_stream_hw_destroy,
+	.set_arg_handle = vmw_stream_set_arg_handle,
+};
+
+/***************************************************************************
+ * End simple resource callbacks for struct vmw_stream
+ **************************************************************************/
+
+/**
+ * vmw_stream_unref_ioctl - Ioctl to unreference a user-space handle to
+ * a struct vmw_stream.
+ * @dev: Pointer to the drm device.
+ * @data: The ioctl argument
+ * @file_priv: Pointer to a struct drm_file identifying the caller.
+ *
+ * Return:
+ *   0 if successful.
+ *   Negative error value on failure.
+ */
+int vmw_stream_unref_ioctl(struct drm_device *dev, void *data,
+			   struct drm_file *file_priv)
+{
+	struct drm_vmw_stream_arg *arg = (struct drm_vmw_stream_arg *)data;
+
+	return ttm_ref_object_base_unref(vmw_fpriv(file_priv)->tfile,
+					 arg->stream_id, TTM_REF_USAGE);
+}
+
+/**
+ * vmw_stream_claim_ioctl - Ioctl to claim a struct vmw_stream overlay.
+ * @dev: Pointer to the drm device.
+ * @data: The ioctl argument
+ * @file_priv: Pointer to a struct drm_file identifying the caller.
+ *
+ * Return:
+ *   0 if successful.
+ *   Negative error value on failure.
+ */
+int vmw_stream_claim_ioctl(struct drm_device *dev, void *data,
+			   struct drm_file *file_priv)
+{
+	return vmw_simple_resource_create_ioctl(dev, data, file_priv,
+						&va_stream_func);
+}
+
+/**
+ * vmw_user_stream_lookup - Look up a struct vmw_user_stream from a handle.
+ * @dev_priv: Pointer to a struct vmw_private.
+ * @tfile: struct ttm_object_file identifying the caller.
+ * @inout_id: In: The user-space handle. Out: The stream id.
+ * @out: On output contains a refcounted pointer to the embedded
+ * struct vmw_resource.
+ *
+ * Return:
+ *   0 if successful.
+ *   Negative error value on failure.
+ */
+int vmw_user_stream_lookup(struct vmw_private *dev_priv,
+			   struct ttm_object_file *tfile,
+			   uint32_t *inout_id, struct vmw_resource **out)
+{
+	struct vmw_stream *stream;
+	struct vmw_resource *res =
+		vmw_simple_resource_lookup(tfile, *inout_id, &va_stream_func);
+
+	if (IS_ERR(res))
+		return PTR_ERR(res);
+
+	stream = vmw_stream(res);
+	*inout_id = stream->stream_id;
+	*out = res;
+
+	return 0;
+}