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// SPDX-License-Identifier: GPL-2.0 OR MIT
/**************************************************************************
*
* Copyright 2016 VMware, Inc., Palo Alto, CA., USA
*
* 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.
* @simple: The embedded struct vmw_simple_resource.
*/
struct vmw_user_simple_resource {
struct ttm_base_object base;
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;
}
simple->res.hw_destroy = 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 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);
ttm_base_object_kfree(usimple, base);
}
/**
* 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;
int ret;
alloc_size = offsetof(struct vmw_user_simple_resource, simple) +
func->size;
usimple = kzalloc(alloc_size, GFP_KERNEL);
if (!usimple) {
ret = -ENOMEM;
goto out_ret;
}
usimple->simple.func = func;
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.handle);
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) {
VMW_DEBUG_USER("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);
VMW_DEBUG_USER("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;
}
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