[linux-2.6-block.git] / drivers / char / drm / drm_agpsupport.c

/**
 * \file drm_agpsupport.h 
 * DRM support for AGP/GART backend
 *    
 * \author Rickard E. (Rik) Faith <faith@valinux.com>
 * \author Gareth Hughes <gareth@valinux.com>
 */

/*
 * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
 * Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
 * 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, 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 (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 NONINFRINGEMENT.  IN NO EVENT SHALL
 * VA LINUX SYSTEMS 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 "drmP.h"
#include <linux/module.h>

#if __OS_HAS_AGP

/**
 * AGP information ioctl.
 *
 * \param inode device inode.
 * \param filp file pointer.
 * \param cmd command.
 * \param arg pointer to a (output) drm_agp_info structure.
 * \return zero on success or a negative number on failure.
 *
 * Verifies the AGP device has been initialized and acquired and fills in the
 * drm_agp_info structure with the information in drm_agp_head::agp_info.
 */
int drm_agp_info(struct inode *inode, struct file *filp,
		  unsigned int cmd, unsigned long arg)
{
	drm_file_t	 *priv	 = filp->private_data;
	drm_device_t	 *dev	 = priv->head->dev;
	DRM_AGP_KERN     *kern;
	drm_agp_info_t   info;

	if (!dev->agp || !dev->agp->acquired)
		return -EINVAL;

	kern                   = &dev->agp->agp_info;
	info.agp_version_major = kern->version.major;
	info.agp_version_minor = kern->version.minor;
	info.mode              = kern->mode;
	info.aperture_base     = kern->aper_base;
	info.aperture_size     = kern->aper_size * 1024 * 1024;
	info.memory_allowed    = kern->max_memory << PAGE_SHIFT;
	info.memory_used       = kern->current_memory << PAGE_SHIFT;
	info.id_vendor         = kern->device->vendor;
	info.id_device         = kern->device->device;

	if (copy_to_user((drm_agp_info_t __user *)arg, &info, sizeof(info)))
		return -EFAULT;
	return 0;
}

/**
 * Acquire the AGP device (ioctl).
 *
 * \param inode device inode.
 * \param filp file pointer.
 * \param cmd command.
 * \param arg user argument.
 * \return zero on success or a negative number on failure. 
 *
 * Verifies the AGP device hasn't been acquired before and calls
 * agp_acquire().
 */
int drm_agp_acquire(struct inode *inode, struct file *filp,
		     unsigned int cmd, unsigned long arg)
{
	drm_file_t	 *priv	 = filp->private_data;
	drm_device_t	 *dev	 = priv->head->dev;

	if (!dev->agp)
		return -ENODEV;
	if (dev->agp->acquired)
		return -EBUSY;
	if (!(dev->agp->bridge = agp_backend_acquire(dev->pdev)))
		return -ENODEV;
	dev->agp->acquired = 1;
	return 0;
}

/**
 * Release the AGP device (ioctl).
 *
 * \param inode device inode.
 * \param filp file pointer.
 * \param cmd command.
 * \param arg user argument.
 * \return zero on success or a negative number on failure.
 *
 * Verifies the AGP device has been acquired and calls agp_backend_release().
 */
int drm_agp_release(struct inode *inode, struct file *filp,
		     unsigned int cmd, unsigned long arg)
{
	drm_file_t	 *priv	 = filp->private_data;
	drm_device_t	 *dev	 = priv->head->dev;

	if (!dev->agp || !dev->agp->acquired)
		return -EINVAL;
	agp_backend_release(dev->agp->bridge);
	dev->agp->acquired = 0;
	return 0;

}

/**
 * Release the AGP device.
 *
 * Calls agp_backend_release().
 */
void drm_agp_do_release(drm_device_t *dev)
{
  agp_backend_release(dev->agp->bridge);
}

/**
 * Enable the AGP bus.
 * 
 * \param inode device inode.
 * \param filp file pointer.
 * \param cmd command.
 * \param arg pointer to a drm_agp_mode structure.
 * \return zero on success or a negative number on failure.
 *
 * Verifies the AGP device has been acquired but not enabled, and calls
 * agp_enable().
 */
int drm_agp_enable(struct inode *inode, struct file *filp,
		    unsigned int cmd, unsigned long arg)
{
	drm_file_t	 *priv	 = filp->private_data;
	drm_device_t	 *dev	 = priv->head->dev;
	drm_agp_mode_t   mode;

	if (!dev->agp || !dev->agp->acquired)
		return -EINVAL;

	if (copy_from_user(&mode, (drm_agp_mode_t __user *)arg, sizeof(mode)))
		return -EFAULT;

	dev->agp->mode    = mode.mode;
	agp_enable(dev->agp->bridge, mode.mode);
	dev->agp->base    = dev->agp->agp_info.aper_base;
	dev->agp->enabled = 1;
	return 0;
}

/**
 * Allocate AGP memory.
 *
 * \param inode device inode.
 * \param filp file pointer.
 * \param cmd command.
 * \param arg pointer to a drm_agp_buffer structure.
 * \return zero on success or a negative number on failure.
 * 
 * Verifies the AGP device is present and has been acquired, allocates the
 * memory via alloc_agp() and creates a drm_agp_mem entry for it.
 */
int drm_agp_alloc(struct inode *inode, struct file *filp,
		   unsigned int cmd, unsigned long arg)
{
	drm_file_t	 *priv	 = filp->private_data;
	drm_device_t	 *dev	 = priv->head->dev;
	drm_agp_buffer_t request;
	drm_agp_mem_t    *entry;
	DRM_AGP_MEM      *memory;
	unsigned long    pages;
	u32 		 type;
	drm_agp_buffer_t __user *argp = (void __user *)arg;

	if (!dev->agp || !dev->agp->acquired)
		return -EINVAL;
	if (copy_from_user(&request, argp, sizeof(request)))
		return -EFAULT;
	if (!(entry = drm_alloc(sizeof(*entry), DRM_MEM_AGPLISTS)))
		return -ENOMEM;

   	memset(entry, 0, sizeof(*entry));

	pages = (request.size + PAGE_SIZE - 1) / PAGE_SIZE;
	type = (u32) request.type;

	if (!(memory = drm_alloc_agp(dev->agp->bridge, pages, type))) {
		drm_free(entry, sizeof(*entry), DRM_MEM_AGPLISTS);
		return -ENOMEM;
	}

	entry->handle    = (unsigned long)memory->key + 1;
	entry->memory    = memory;
	entry->bound     = 0;
	entry->pages     = pages;
	entry->prev      = NULL;
	entry->next      = dev->agp->memory;
	if (dev->agp->memory)
		dev->agp->memory->prev = entry;
	dev->agp->memory = entry;

	request.handle   = entry->handle;
	request.physical = memory->physical;

	if (copy_to_user(argp, &request, sizeof(request))) {
		dev->agp->memory       = entry->next;
		dev->agp->memory->prev = NULL;
		drm_free_agp(memory, pages);
		drm_free(entry, sizeof(*entry), DRM_MEM_AGPLISTS);
		return -EFAULT;
	}
	return 0;
}

/**
 * Search for the AGP memory entry associated with a handle.
 *
 * \param dev DRM device structure.
 * \param handle AGP memory handle.
 * \return pointer to the drm_agp_mem structure associated with \p handle.
 * 
 * Walks through drm_agp_head::memory until finding a matching handle.
 */
static drm_agp_mem_t *drm_agp_lookup_entry(drm_device_t *dev,
					    unsigned long handle)
{
	drm_agp_mem_t *entry;

	for (entry = dev->agp->memory; entry; entry = entry->next) {
		if (entry->handle == handle)
			return entry;
	}
	return NULL;
}

/**
 * Unbind AGP memory from the GATT (ioctl).
 *
 * \param inode device inode.
 * \param filp file pointer.
 * \param cmd command.
 * \param arg pointer to a drm_agp_binding structure.
 * \return zero on success or a negative number on failure.
 *
 * Verifies the AGP device is present and acquired, looks-up the AGP memory
 * entry and passes it to the unbind_agp() function.
 */
int drm_agp_unbind(struct inode *inode, struct file *filp,
		    unsigned int cmd, unsigned long arg)
{
	drm_file_t	  *priv	 = filp->private_data;
	drm_device_t	  *dev	 = priv->head->dev;
	drm_agp_binding_t request;
	drm_agp_mem_t     *entry;
	int ret;

	if (!dev->agp || !dev->agp->acquired)
		return -EINVAL;
	if (copy_from_user(&request, (drm_agp_binding_t __user *)arg, sizeof(request)))
		return -EFAULT;
	if (!(entry = drm_agp_lookup_entry(dev, request.handle)))
		return -EINVAL;
	if (!entry->bound)
		return -EINVAL;
	ret = drm_unbind_agp(entry->memory);
	if (ret == 0)
	    entry->bound = 0;
	return ret;
}

/**
 * Bind AGP memory into the GATT (ioctl)
 *
 * \param inode device inode.
 * \param filp file pointer.
 * \param cmd command.
 * \param arg pointer to a drm_agp_binding structure.
 * \return zero on success or a negative number on failure.
 *
 * Verifies the AGP device is present and has been acquired and that no memory
 * is currently bound into the GATT. Looks-up the AGP memory entry and passes
 * it to bind_agp() function.
 */
int drm_agp_bind(struct inode *inode, struct file *filp,
		  unsigned int cmd, unsigned long arg)
{
	drm_file_t	  *priv	 = filp->private_data;
	drm_device_t	  *dev	 = priv->head->dev;
	drm_agp_binding_t request;
	drm_agp_mem_t     *entry;
	int               retcode;
	int               page;

	if (!dev->agp || !dev->agp->acquired)
		return -EINVAL;
	if (copy_from_user(&request, (drm_agp_binding_t __user *)arg, sizeof(request)))
		return -EFAULT;
	if (!(entry = drm_agp_lookup_entry(dev, request.handle)))
		return -EINVAL;
	if (entry->bound)
		return -EINVAL;
	page = (request.offset + PAGE_SIZE - 1) / PAGE_SIZE;
	if ((retcode = drm_bind_agp(entry->memory, page)))
		return retcode;
	entry->bound = dev->agp->base + (page << PAGE_SHIFT);
	DRM_DEBUG("base = 0x%lx entry->bound = 0x%lx\n",
		  dev->agp->base, entry->bound);
	return 0;
}

/**
 * Free AGP memory (ioctl).
 *
 * \param inode device inode.
 * \param filp file pointer.
 * \param cmd command.
 * \param arg pointer to a drm_agp_buffer structure.
 * \return zero on success or a negative number on failure.
 *
 * Verifies the AGP device is present and has been acquired and looks up the
 * AGP memory entry. If the memory it's currently bound, unbind it via
 * unbind_agp(). Frees it via free_agp() as well as the entry itself
 * and unlinks from the doubly linked list it's inserted in.
 */
int drm_agp_free(struct inode *inode, struct file *filp,
		  unsigned int cmd, unsigned long arg)
{
	drm_file_t	 *priv	 = filp->private_data;
	drm_device_t	 *dev	 = priv->head->dev;
	drm_agp_buffer_t request;
	drm_agp_mem_t    *entry;

	if (!dev->agp || !dev->agp->acquired)
		return -EINVAL;
	if (copy_from_user(&request, (drm_agp_buffer_t __user *)arg, sizeof(request)))
		return -EFAULT;
	if (!(entry = drm_agp_lookup_entry(dev, request.handle)))
		return -EINVAL;
	if (entry->bound)
		drm_unbind_agp(entry->memory);

	if (entry->prev)
		entry->prev->next = entry->next;
	else
		dev->agp->memory = entry->next;

	if (entry->next)
		entry->next->prev = entry->prev;

	drm_free_agp(entry->memory, entry->pages);
	drm_free(entry, sizeof(*entry), DRM_MEM_AGPLISTS);
	return 0;
}

/**
 * Initialize the AGP resources.
 *
 * \return pointer to a drm_agp_head structure.
 *
 */
drm_agp_head_t *drm_agp_init(drm_device_t *dev)
{
	drm_agp_head_t *head         = NULL;

	if (!(head = drm_alloc(sizeof(*head), DRM_MEM_AGPLISTS)))
		return NULL;
	memset((void *)head, 0, sizeof(*head));
	head->bridge = agp_find_bridge(dev->pdev);
	if (!head->bridge) {
		if (!(head->bridge = agp_backend_acquire(dev->pdev))) {
			drm_free(head, sizeof(*head), DRM_MEM_AGPLISTS);
			return NULL;
		}
		agp_copy_info(head->bridge, &head->agp_info);
		agp_backend_release(head->bridge);
	} else {
		agp_copy_info(head->bridge, &head->agp_info);
	}
	if (head->agp_info.chipset == NOT_SUPPORTED) {
		drm_free(head, sizeof(*head), DRM_MEM_AGPLISTS);
		return NULL;
	}
	head->memory = NULL;
#if LINUX_VERSION_CODE <= 0x020408
	head->cant_use_aperture = 0;
	head->page_mask = ~(0xfff);
#else
	head->cant_use_aperture = head->agp_info.cant_use_aperture;
	head->page_mask = head->agp_info.page_mask;
#endif

	return head;
}

/** Calls agp_allocate_memory() */
DRM_AGP_MEM *drm_agp_allocate_memory(struct agp_bridge_data *bridge, size_t pages, u32 type)
{
	return agp_allocate_memory(bridge, pages, type);
}

/** Calls agp_free_memory() */
int drm_agp_free_memory(DRM_AGP_MEM *handle)
{
	if (!handle)
		return 0;
	agp_free_memory(handle);
	return 1;
}

/** Calls agp_bind_memory() */
int drm_agp_bind_memory(DRM_AGP_MEM *handle, off_t start)
{
	if (!handle)
		return -EINVAL;
	return agp_bind_memory(handle, start);
}

/** Calls agp_unbind_memory() */
int drm_agp_unbind_memory(DRM_AGP_MEM *handle)
{
	if (!handle)
		return -EINVAL;
	return agp_unbind_memory(handle);
}

#endif /* __OS_HAS_AGP */
Commit	Line	Data
1da177e4 LT	1	/**
	2	* \file drm_agpsupport.h
	3	* DRM support for AGP/GART backend
	4	*
	5	* \author Rickard E. (Rik) Faith <faith@valinux.com>
	6	* \author Gareth Hughes <gareth@valinux.com>
	7	*/
	8
	9	/*
	10	* Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
	11	* Copyright 2000 VA Linux Systems, Inc., Sunnyvale, California.
	12	* All Rights Reserved.
	13	*
	14	* Permission is hereby granted, free of charge, to any person obtaining a
	15	* copy of this software and associated documentation files (the "Software"),
	16	* to deal in the Software without restriction, including without limitation
	17	* the rights to use, copy, modify, merge, publish, distribute, sublicense,
	18	* and/or sell copies of the Software, and to permit persons to whom the
	19	* Software is furnished to do so, subject to the following conditions:
	20	*
	21	* The above copyright notice and this permission notice (including the next
	22	* paragraph) shall be included in all copies or substantial portions of the
	23	* Software.
	24	*
	25	* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
	26	* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
	27	* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
	28	* VA LINUX SYSTEMS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
	29	* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
	30	* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
	31	* OTHER DEALINGS IN THE SOFTWARE.
	32	*/
	33
	34	#include "drmP.h"
	35	#include <linux/module.h>
	36
	37	#if __OS_HAS_AGP
	38
	39	/**
	40	* AGP information ioctl.
	41	*
	42	* \param inode device inode.
	43	* \param filp file pointer.
	44	* \param cmd command.
	45	* \param arg pointer to a (output) drm_agp_info structure.
	46	* \return zero on success or a negative number on failure.
	47	*
	48	* Verifies the AGP device has been initialized and acquired and fills in the
	49	* drm_agp_info structure with the information in drm_agp_head::agp_info.
	50	*/
	51	int drm_agp_info(struct inode inode, struct file filp,
	52	unsigned int cmd, unsigned long arg)
	53	{
	54	drm_file_t *priv = filp->private_data;
	55	drm_device_t *dev = priv->head->dev;
	56	DRM_AGP_KERN *kern;
	57	drm_agp_info_t info;
	58
	59	if (!dev->agp \|\| !dev->agp->acquired)
	60	return -EINVAL;
	61
	62	kern = &dev->agp->agp_info;
	63	info.agp_version_major = kern->version.major;
	64	info.agp_version_minor = kern->version.minor;
65	info.mode = kern->mode;
66	info.aperture_base = kern->aper_base;
67	info.aperture_size = kern->aper_size * 1024 * 1024;
68	info.memory_allowed = kern->max_memory << PAGE_SHIFT;
69	info.memory_used = kern->current_memory << PAGE_SHIFT;
70	info.id_vendor = kern->device->vendor;
71	info.id_device = kern->device->device;
72
73	if (copy_to_user((drm_agp_info_t __user *)arg, &info, sizeof(info)))
74	return -EFAULT;
75	return 0;
76	}
77
78	/**
79	* Acquire the AGP device (ioctl).
80	*
81	* \param inode device inode.
82	* \param filp file pointer.
83	* \param cmd command.
84	* \param arg user argument.
85	* \return zero on success or a negative number on failure.
86	*
87	* Verifies the AGP device hasn't been acquired before and calls
88	* agp_acquire().
89	*/
90	int drm_agp_acquire(struct inode inode, struct file filp,
91	unsigned int cmd, unsigned long arg)
92	{
93	drm_file_t *priv = filp->private_data;
94	drm_device_t *dev = priv->head->dev;
95
96	if (!dev->agp)
97	return -ENODEV;
98	if (dev->agp->acquired)
99	return -EBUSY;
100	if (!(dev->agp->bridge = agp_backend_acquire(dev->pdev)))
101	return -ENODEV;
102	dev->agp->acquired = 1;
103	return 0;
104	}
105
106	/**
107	* Release the AGP device (ioctl).
108	*
109	* \param inode device inode.
110	* \param filp file pointer.
111	* \param cmd command.
112	* \param arg user argument.
113	* \return zero on success or a negative number on failure.
114	*
115	* Verifies the AGP device has been acquired and calls agp_backend_release().
116	*/
117	int drm_agp_release(struct inode inode, struct file filp,
118	unsigned int cmd, unsigned long arg)
119	{
120	drm_file_t *priv = filp->private_data;
121	drm_device_t *dev = priv->head->dev;
122
123	if (!dev->agp \|\| !dev->agp->acquired)
124	return -EINVAL;
125	agp_backend_release(dev->agp->bridge);
126	dev->agp->acquired = 0;
127	return 0;
128
129	}
130
131	/**
132	* Release the AGP device.
133	*
134	* Calls agp_backend_release().
135	*/
136	void drm_agp_do_release(drm_device_t *dev)
137	{
138	agp_backend_release(dev->agp->bridge);
139	}
140
141	/**
142	* Enable the AGP bus.
143	*
144	* \param inode device inode.
145	* \param filp file pointer.
146	* \param cmd command.
147	* \param arg pointer to a drm_agp_mode structure.
148	* \return zero on success or a negative number on failure.
149	*
150	* Verifies the AGP device has been acquired but not enabled, and calls
151	* agp_enable().
152	*/
153	int drm_agp_enable(struct inode inode, struct file filp,
154	unsigned int cmd, unsigned long arg)
155	{
156	drm_file_t *priv = filp->private_data;
157	drm_device_t *dev = priv->head->dev;
158	drm_agp_mode_t mode;
159
160	if (!dev->agp \|\| !dev->agp->acquired)
161	return -EINVAL;
162
163	if (copy_from_user(&mode, (drm_agp_mode_t __user *)arg, sizeof(mode)))
164	return -EFAULT;
165
166	dev->agp->mode = mode.mode;
167	agp_enable(dev->agp->bridge, mode.mode);
168	dev->agp->base = dev->agp->agp_info.aper_base;
169	dev->agp->enabled = 1;
170	return 0;
171	}
172
173	/**
174	* Allocate AGP memory.
175	*
176	* \param inode device inode.
177	* \param filp file pointer.
178	* \param cmd command.
179	* \param arg pointer to a drm_agp_buffer structure.
180	* \return zero on success or a negative number on failure.
181	*
182	* Verifies the AGP device is present and has been acquired, allocates the
183	* memory via alloc_agp() and creates a drm_agp_mem entry for it.
184	*/
185	int drm_agp_alloc(struct inode inode, struct file filp,
186	unsigned int cmd, unsigned long arg)
187	{
188	drm_file_t *priv = filp->private_data;
189	drm_device_t *dev = priv->head->dev;
190	drm_agp_buffer_t request;
191	drm_agp_mem_t *entry;
192	DRM_AGP_MEM *memory;
193	unsigned long pages;
194	u32 type;
195	drm_agp_buffer_t __user argp = (void __user )arg;
196
197	if (!dev->agp \|\| !dev->agp->acquired)
198	return -EINVAL;
199	if (copy_from_user(&request, argp, sizeof(request)))
200	return -EFAULT;
201	if (!(entry = drm_alloc(sizeof(*entry), DRM_MEM_AGPLISTS)))
202	return -ENOMEM;
203
204	memset(entry, 0, sizeof(*entry));
205
206	pages = (request.size + PAGE_SIZE - 1) / PAGE_SIZE;
207	type = (u32) request.type;
208
209	if (!(memory = drm_alloc_agp(dev->agp->bridge, pages, type))) {
210	drm_free(entry, sizeof(*entry), DRM_MEM_AGPLISTS);
211	return -ENOMEM;
212	}
213
214	entry->handle = (unsigned long)memory->key + 1;
215	entry->memory = memory;
216	entry->bound = 0;
217	entry->pages = pages;
218	entry->prev = NULL;
219	entry->next = dev->agp->memory;
220	if (dev->agp->memory)
221	dev->agp->memory->prev = entry;
222	dev->agp->memory = entry;
223
224	request.handle = entry->handle;
225	request.physical = memory->physical;
226
227	if (copy_to_user(argp, &request, sizeof(request))) {
228	dev->agp->memory = entry->next;
229	dev->agp->memory->prev = NULL;
230	drm_free_agp(memory, pages);
231	drm_free(entry, sizeof(*entry), DRM_MEM_AGPLISTS);
232	return -EFAULT;
233	}
234	return 0;
235	}
236
237	/**
238	* Search for the AGP memory entry associated with a handle.
239	*
240	* \param dev DRM device structure.
241	* \param handle AGP memory handle.
242	* \return pointer to the drm_agp_mem structure associated with \p handle.
243	*
244	* Walks through drm_agp_head::memory until finding a matching handle.
245	*/
246	static drm_agp_mem_t drm_agp_lookup_entry(drm_device_t dev,
247	unsigned long handle)
248	{
249	drm_agp_mem_t *entry;
250
251	for (entry = dev->agp->memory; entry; entry = entry->next) {
252	if (entry->handle == handle)
253	return entry;
254	}
255	return NULL;
256	}
257
258	/**
259	* Unbind AGP memory from the GATT (ioctl).
260	*
261	* \param inode device inode.
262	* \param filp file pointer.
263	* \param cmd command.
264	* \param arg pointer to a drm_agp_binding structure.
265	* \return zero on success or a negative number on failure.
266	*
267	* Verifies the AGP device is present and acquired, looks-up the AGP memory
268	* entry and passes it to the unbind_agp() function.
269	*/
270	int drm_agp_unbind(struct inode inode, struct file filp,
271	unsigned int cmd, unsigned long arg)
272	{
273	drm_file_t *priv = filp->private_data;
274	drm_device_t *dev = priv->head->dev;
275	drm_agp_binding_t request;
276	drm_agp_mem_t *entry;
277	int ret;
278
279	if (!dev->agp \|\| !dev->agp->acquired)
280	return -EINVAL;
281	if (copy_from_user(&request, (drm_agp_binding_t __user *)arg, sizeof(request)))
282	return -EFAULT;
283	if (!(entry = drm_agp_lookup_entry(dev, request.handle)))
284	return -EINVAL;
285	if (!entry->bound)
286	return -EINVAL;
287	ret = drm_unbind_agp(entry->memory);
288	if (ret == 0)
289	entry->bound = 0;
290	return ret;
291	}
292
293	/**
294	* Bind AGP memory into the GATT (ioctl)
295	*
296	* \param inode device inode.
297	* \param filp file pointer.
298	* \param cmd command.
299	* \param arg pointer to a drm_agp_binding structure.
300	* \return zero on success or a negative number on failure.
301	*
302	* Verifies the AGP device is present and has been acquired and that no memory
303	* is currently bound into the GATT. Looks-up the AGP memory entry and passes
304	* it to bind_agp() function.
305	*/
306	int drm_agp_bind(struct inode inode, struct file filp,
307	unsigned int cmd, unsigned long arg)
308	{
309	drm_file_t *priv = filp->private_data;
310	drm_device_t *dev = priv->head->dev;
311	drm_agp_binding_t request;
312	drm_agp_mem_t *entry;
313	int retcode;
314	int page;
315
316	if (!dev->agp \|\| !dev->agp->acquired)
317	return -EINVAL;
318	if (copy_from_user(&request, (drm_agp_binding_t __user *)arg, sizeof(request)))
319	return -EFAULT;
320	if (!(entry = drm_agp_lookup_entry(dev, request.handle)))
321	return -EINVAL;
322	if (entry->bound)
323	return -EINVAL;
324	page = (request.offset + PAGE_SIZE - 1) / PAGE_SIZE;
325	if ((retcode = drm_bind_agp(entry->memory, page)))
326	return retcode;
327	entry->bound = dev->agp->base + (page << PAGE_SHIFT);
328	DRM_DEBUG("base = 0x%lx entry->bound = 0x%lx\n",
329	dev->agp->base, entry->bound);
330	return 0;
331	}
332
333	/**
334	* Free AGP memory (ioctl).
335	*
336	* \param inode device inode.
337	* \param filp file pointer.
338	* \param cmd command.
339	* \param arg pointer to a drm_agp_buffer structure.
340	* \return zero on success or a negative number on failure.
341	*
342	* Verifies the AGP device is present and has been acquired and looks up the
343	* AGP memory entry. If the memory it's currently bound, unbind it via
344	* unbind_agp(). Frees it via free_agp() as well as the entry itself
345	* and unlinks from the doubly linked list it's inserted in.
346	*/
347	int drm_agp_free(struct inode inode, struct file filp,
348	unsigned int cmd, unsigned long arg)
349	{
350	drm_file_t *priv = filp->private_data;
351	drm_device_t *dev = priv->head->dev;
352	drm_agp_buffer_t request;
353	drm_agp_mem_t *entry;
354
355	if (!dev->agp \|\| !dev->agp->acquired)
356	return -EINVAL;
357	if (copy_from_user(&request, (drm_agp_buffer_t __user *)arg, sizeof(request)))
358	return -EFAULT;
359	if (!(entry = drm_agp_lookup_entry(dev, request.handle)))
360	return -EINVAL;
361	if (entry->bound)
362	drm_unbind_agp(entry->memory);
363
364	if (entry->prev)
365	entry->prev->next = entry->next;
366	else
367	dev->agp->memory = entry->next;
368
369	if (entry->next)
370	entry->next->prev = entry->prev;
371
372	drm_free_agp(entry->memory, entry->pages);
373	drm_free(entry, sizeof(*entry), DRM_MEM_AGPLISTS);
374	return 0;
375	}
376
377	/**
378	* Initialize the AGP resources.
379	*
380	* \return pointer to a drm_agp_head structure.
381	*
382	*/
383	drm_agp_head_t drm_agp_init(drm_device_t dev)
384	{
385	drm_agp_head_t *head = NULL;
386
387	if (!(head = drm_alloc(sizeof(*head), DRM_MEM_AGPLISTS)))
388	return NULL;
389	memset((void )head, 0, sizeof(head));
390	head->bridge = agp_find_bridge(dev->pdev);
391	if (!head->bridge) {
392	if (!(head->bridge = agp_backend_acquire(dev->pdev))) {
393	drm_free(head, sizeof(*head), DRM_MEM_AGPLISTS);
394	return NULL;
395	}
396	agp_copy_info(head->bridge, &head->agp_info);
397	agp_backend_release(head->bridge);
398	} else {
399	agp_copy_info(head->bridge, &head->agp_info);
400	}
401	if (head->agp_info.chipset == NOT_SUPPORTED) {
402	drm_free(head, sizeof(*head), DRM_MEM_AGPLISTS);
403	return NULL;
404	}
405	head->memory = NULL;
406	#if LINUX_VERSION_CODE <= 0x020408
407	head->cant_use_aperture = 0;
408	head->page_mask = ~(0xfff);
409	#else
410	head->cant_use_aperture = head->agp_info.cant_use_aperture;
411	head->page_mask = head->agp_info.page_mask;
412	#endif
413
414	return head;
415	}
416
417	/** Calls agp_allocate_memory() */
418	DRM_AGP_MEM drm_agp_allocate_memory(struct agp_bridge_data bridge, size_t pages, u32 type)
419	{
420	return agp_allocate_memory(bridge, pages, type);
421	}
422
423	/** Calls agp_free_memory() */
424	int drm_agp_free_memory(DRM_AGP_MEM *handle)
425	{
426	if (!handle)
427	return 0;
428	agp_free_memory(handle);
429	return 1;
430	}
431
432	/** Calls agp_bind_memory() */
433	int drm_agp_bind_memory(DRM_AGP_MEM *handle, off_t start)
434	{
435	if (!handle)
436	return -EINVAL;
437	return agp_bind_memory(handle, start);
438	}
439
440	/** Calls agp_unbind_memory() */
441	int drm_agp_unbind_memory(DRM_AGP_MEM *handle)
442	{
443	if (!handle)
444	return -EINVAL;
445	return agp_unbind_memory(handle);
446	}
447
448	#endif /* __OS_HAS_AGP */