drm/vmwgfx: Introduce a simple resource type

The callbacks we need to provide to many resources are very similar, so
provide a simple resource type with a number of helpers for these
callbacks.
Signed-off-by: Thomas Hellstrom <thellstrom@vmware.com>
Reviewed-by: Sinclair Yeh <syeh@vmware.com>

drivers/gpu/drm/vmwgfx/Makefile

@@ -8,6 +8,7 @@ vmwgfx-y := vmwgfx_execbuf.o vmwgfx_gmr.o vmwgfx_kms.o vmwgfx_drv.o \
 	    vmwgfx_fence.o vmwgfx_dmabuf.o vmwgfx_scrn.o vmwgfx_context.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_cotable.o vmwgfx_so.o vmwgfx_binding.o vmwgfx_msg.o \
+	    vmwgfx_simple_resource.o
 
 obj-$(CONFIG_DRM_VMWGFX) := vmwgfx.o

drivers/gpu/drm/vmwgfx/vmwgfx_resource_priv.h

@@ -30,6 +30,8 @@
 
 #include "vmwgfx_drv.h"
 
+#define VMW_IDA_ACC_SIZE 128
+
 enum vmw_cmdbuf_res_state {
 	VMW_CMDBUF_RES_COMMITTED,
 	VMW_CMDBUF_RES_ADD,
@@ -83,6 +85,35 @@ struct vmw_res_func {
 			      enum vmw_cmdbuf_res_state state);
 };
 
+/**
+ * struct vmw_simple_resource_func - members and functions common for the
+ * simple resource helpers.
+ * @res_func:  struct vmw_res_func as described above.
+ * @ttm_res_type:  TTM resource type used for handle recognition.
+ * @size:  Size of the simple resource information struct.
+ * @init:  Initialize the simple resource information.
+ * @hw_destroy:  A resource hw_destroy function.
+ * @set_arg_handle:  Set the handle output argument of the ioctl create struct.
+ */
+struct vmw_simple_resource_func {
+	const struct vmw_res_func res_func;
+	int ttm_res_type;
+	size_t size;
+	int (*init)(struct vmw_resource *res, void *data);
+	void (*hw_destroy)(struct vmw_resource *res);
+	void (*set_arg_handle)(void *data, u32 handle);
+};
+
+/**
+ * struct vmw_simple_resource - Kernel only side simple resource
+ * @res: The resource we derive from.
+ * @func: The method and member virtual table.
+ */
+struct vmw_simple_resource {
+	struct vmw_resource res;
+	const struct vmw_simple_resource_func *func;
+};
+
 int vmw_resource_alloc_id(struct vmw_resource *res);
 void vmw_resource_release_id(struct vmw_resource *res);
 int vmw_resource_init(struct vmw_private *dev_priv, struct vmw_resource *res,
@@ -91,4 +122,13 @@ int vmw_resource_init(struct vmw_private *dev_priv, struct vmw_resource *res,
 		      const struct vmw_res_func *func);
 void vmw_resource_activate(struct vmw_resource *res,
 			   void (*hw_destroy) (struct vmw_resource *));
+int
+vmw_simple_resource_create_ioctl(struct drm_device *dev,
+				 void *data,
+				 struct drm_file *file_priv,
+				 const struct vmw_simple_resource_func *func);
+struct vmw_resource *
+vmw_simple_resource_lookup(struct ttm_object_file *tfile,
+			   uint32_t handle,
+			   const struct vmw_simple_resource_func *func);
 #endif

drivers/gpu/drm/vmwgfx/vmwgfx_simple_resource.c

+/**************************************************************************
+ *
+ * Copyright © 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_user_simple_resource - User-space simple resource struct
+ *
+ * @base: The TTM base object implementing user-space visibility.
+ * @account_size: How much memory was accounted for this object.
+ * @simple: The embedded struct vmw_simple_resource.
+ */
+struct vmw_user_simple_resource {
+	struct ttm_base_object base;
+	size_t account_size;
+	struct vmw_simple_resource simple;
+/*
+ * Nothing to be placed after @simple, since size of @simple is
+ * unknown.
+ */
+};
+
+
+/**
+ * vmw_simple_resource_init - Initialize a simple resource object.
+ *
+ * @dev_priv: Pointer to a struct device private.
+ * @simple: The struct vmw_simple_resource to initialize.
+ * @data: Data passed to the information initialization function.
+ * @res_free: Function pointer to destroy the simple resource.
+ *
+ * Returns:
+ *   0 if succeeded.
+ *   Negative error value if error, in which case the resource will have been
+ * freed.
+ */
+static int vmw_simple_resource_init(struct vmw_private *dev_priv,
+				    struct vmw_simple_resource *simple,
+				    void *data,
+				    void (*res_free)(struct vmw_resource *res))
+{
+	struct vmw_resource *res = &simple->res;
+	int ret;
+
+	ret = vmw_resource_init(dev_priv, res, false, res_free,
+				&simple->func->res_func);
+
+	if (ret) {
+		res_free(res);
+		return ret;
+	}
+
+	ret = simple->func->init(res, data);
+	if (ret) {
+		vmw_resource_unreference(&res);
+		return ret;
+	}
+
+	vmw_resource_activate(&simple->res, simple->func->hw_destroy);
+
+	return 0;
+}
+
+/**
+ * vmw_simple_resource_free - Free a simple resource object.
+ *
+ * @res: The struct vmw_resource member of the simple resource object.
+ *
+ * Frees memory and memory accounting for the object.
+ */
+static void vmw_simple_resource_free(struct vmw_resource *res)
+{
+	struct vmw_user_simple_resource *usimple =
+		container_of(res, struct vmw_user_simple_resource,
+			     simple.res);
+	struct vmw_private *dev_priv = res->dev_priv;
+	size_t size = usimple->account_size;
+
+	ttm_base_object_kfree(usimple, base);
+	ttm_mem_global_free(vmw_mem_glob(dev_priv), size);
+}
+
+/**
+ * vmw_simple_resource_base_release - TTM object release callback
+ *
+ * @p_base: The struct ttm_base_object member of the simple resource object.
+ *
+ * Called when the last reference to the embedded struct ttm_base_object is
+ * gone. Typically results in an object free, unless there are other
+ * references to the embedded struct vmw_resource.
+ */
+static void vmw_simple_resource_base_release(struct ttm_base_object **p_base)
+{
+	struct ttm_base_object *base = *p_base;
+	struct vmw_user_simple_resource *usimple =
+		container_of(base, struct vmw_user_simple_resource, base);
+	struct vmw_resource *res = &usimple->simple.res;
+
+	*p_base = NULL;
+	vmw_resource_unreference(&res);
+}
+
+/**
+ * vmw_simple_resource_create_ioctl - Helper to set up an ioctl function to
+ * create a struct vmw_simple_resource.
+ *
+ * @dev: Pointer to a struct drm device.
+ * @data: Ioctl argument.
+ * @file_priv: Pointer to a struct drm_file identifying the caller.
+ * @func: Pointer to a struct vmw_simple_resource_func identifying the
+ * simple resource type.
+ *
+ * Returns:
+ *   0 if success,
+ *   Negative error value on error.
+ */
+int
+vmw_simple_resource_create_ioctl(struct drm_device *dev, void *data,
+				 struct drm_file *file_priv,
+				 const struct vmw_simple_resource_func *func)
+{
+	struct vmw_private *dev_priv = vmw_priv(dev);
+	struct vmw_user_simple_resource *usimple;
+	struct vmw_resource *res;
+	struct vmw_resource *tmp;
+	struct ttm_object_file *tfile = vmw_fpriv(file_priv)->tfile;
+	size_t alloc_size;
+	size_t account_size;
+	int ret;
+
+	alloc_size = offsetof(struct vmw_user_simple_resource, simple) +
+	  func->size;
+	account_size = ttm_round_pot(alloc_size) + VMW_IDA_ACC_SIZE;
+
+	ret = ttm_read_lock(&dev_priv->reservation_sem, true);
+	if (ret)
+		return ret;
+
+	ret = ttm_mem_global_alloc(vmw_mem_glob(dev_priv), account_size,
+				   false, true);
+	ttm_read_unlock(&dev_priv->reservation_sem);
+	if (ret) {
+		if (ret != -ERESTARTSYS)
+			DRM_ERROR("Out of graphics memory for %s"
+				  " creation.\n", func->res_func.type_name);
+
+		goto out_ret;
+	}
+
+	usimple = kzalloc(alloc_size, GFP_KERNEL);
+	if (!usimple) {
+		ttm_mem_global_free(vmw_mem_glob(dev_priv),
+				    account_size);
+		ret = -ENOMEM;
+		goto out_ret;
+	}
+
+	usimple->simple.func = func;
+	usimple->account_size = account_size;
+	res = &usimple->simple.res;
+	usimple->base.shareable = false;
+	usimple->base.tfile = NULL;
+
+	/*
+	 * From here on, the destructor takes over resource freeing.
+	 */
+	ret = vmw_simple_resource_init(dev_priv, &usimple->simple,
+				       data, vmw_simple_resource_free);
+	if (ret)
+		goto out_ret;
+
+	tmp = vmw_resource_reference(res);
+	ret = ttm_base_object_init(tfile, &usimple->base, false,
+				   func->ttm_res_type,
+				   &vmw_simple_resource_base_release, NULL);
+
+	if (ret) {
+		vmw_resource_unreference(&tmp);
+		goto out_err;
+	}
+
+	func->set_arg_handle(data, usimple->base.hash.key);
+out_err:
+	vmw_resource_unreference(&res);
+out_ret:
+	return ret;
+}
+
+/**
+ * vmw_simple_resource_lookup - Look up a simple resource from its user-space
+ * handle.
+ *
+ * @tfile: struct ttm_object_file identifying the caller.
+ * @handle: The user-space handle.
+ * @func: The struct vmw_simple_resource_func identifying the simple resource
+ * type.
+ *
+ * Returns: Refcounted pointer to the embedded struct vmw_resource if
+ * successfule. Error pointer otherwise.
+ */
+struct vmw_resource *
+vmw_simple_resource_lookup(struct ttm_object_file *tfile,
+			   uint32_t handle,
+			   const struct vmw_simple_resource_func *func)
+{
+	struct vmw_user_simple_resource *usimple;
+	struct ttm_base_object *base;
+	struct vmw_resource *res;
+
+	base = ttm_base_object_lookup(tfile, handle);
+	if (!base) {
+		DRM_ERROR("Invalid %s handle 0x%08lx.\n",
+			  func->res_func.type_name,
+			  (unsigned long) handle);
+		return ERR_PTR(-ESRCH);
+	}
+
+	if (ttm_base_object_type(base) != func->ttm_res_type) {
+		ttm_base_object_unref(&base);
+		DRM_ERROR("Invalid type of %s handle 0x%08lx.\n",
+			  func->res_func.type_name,
+			  (unsigned long) handle);
+		return ERR_PTR(-EINVAL);
+	}
+
+	usimple = container_of(base, typeof(*usimple), base);
+	res = vmw_resource_reference(&usimple->simple.res);
+	ttm_base_object_unref(&base);
+
+	return res;
+}