[deliverable/linux.git] / drivers / char / drm / drm_stub.c

/**
 * \file drm_stub.h
 * Stub support
 *
 * \author Rickard E. (Rik) Faith <faith@valinux.com>
 */

/*
 * Created: Fri Jan 19 10:48:35 2001 by faith@acm.org
 *
 * Copyright 2001 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
 * PRECISION INSIGHT 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 <linux/module.h>
#include <linux/moduleparam.h>
#include "drmP.h"
#include "drm_core.h"

unsigned int drm_cards_limit = 16;	/* Enough for one machine */
unsigned int drm_debug = 0;	/* 1 to enable debug output */
EXPORT_SYMBOL(drm_debug);

MODULE_AUTHOR(CORE_AUTHOR);
MODULE_DESCRIPTION(CORE_DESC);
MODULE_LICENSE("GPL and additional rights");
MODULE_PARM_DESC(cards_limit, "Maximum number of graphics cards");
MODULE_PARM_DESC(debug, "Enable debug output");

module_param_named(cards_limit, drm_cards_limit, int, 0444);
module_param_named(debug, drm_debug, int, 0666);

drm_head_t **drm_heads;
struct drm_sysfs_class *drm_class;
struct proc_dir_entry *drm_proc_root;

static int drm_fill_in_dev(drm_device_t * dev, struct pci_dev *pdev,
			   const struct pci_device_id *ent,
			   struct drm_driver *driver)
{
	int retcode;

	spin_lock_init(&dev->count_lock);
	init_timer(&dev->timer);
	sema_init(&dev->struct_sem, 1);
	sema_init(&dev->ctxlist_sem, 1);

	dev->pdev = pdev;

#ifdef __alpha__
	dev->hose = pdev->sysdata;
	dev->pci_domain = dev->hose->bus->number;
#else
	dev->pci_domain = 0;
#endif
	dev->pci_bus = pdev->bus->number;
	dev->pci_slot = PCI_SLOT(pdev->devfn);
	dev->pci_func = PCI_FUNC(pdev->devfn);
	dev->irq = pdev->irq;

	dev->maplist = drm_calloc(1, sizeof(*dev->maplist), DRM_MEM_MAPS);
	if (dev->maplist == NULL)
		return -ENOMEM;
	INIT_LIST_HEAD(&dev->maplist->head);

	/* the DRM has 6 basic counters */
	dev->counters = 6;
	dev->types[0] = _DRM_STAT_LOCK;
	dev->types[1] = _DRM_STAT_OPENS;
	dev->types[2] = _DRM_STAT_CLOSES;
	dev->types[3] = _DRM_STAT_IOCTLS;
	dev->types[4] = _DRM_STAT_LOCKS;
	dev->types[5] = _DRM_STAT_UNLOCKS;

	dev->driver = driver;

	if (dev->driver->preinit)
		if ((retcode = dev->driver->preinit(dev, ent->driver_data)))
			goto error_out_unreg;

	if (drm_core_has_AGP(dev)) {
		if (drm_device_is_agp(dev))
			dev->agp = drm_agp_init(dev);
		if (drm_core_check_feature(dev, DRIVER_REQUIRE_AGP)
		    && (dev->agp == NULL)) {
			DRM_ERROR("Cannot initialize the agpgart module.\n");
			retcode = -EINVAL;
			goto error_out_unreg;
		}
		if (drm_core_has_MTRR(dev)) {
			if (dev->agp)
				dev->agp->agp_mtrr =
				    mtrr_add(dev->agp->agp_info.aper_base,
					     dev->agp->agp_info.aper_size *
					     1024 * 1024, MTRR_TYPE_WRCOMB, 1);
		}
	}

	retcode = drm_ctxbitmap_init(dev);
	if (retcode) {
		DRM_ERROR("Cannot allocate memory for context bitmap.\n");
		goto error_out_unreg;
	}

	return 0;

      error_out_unreg:
	drm_takedown(dev);
	return retcode;
}

/**
 * File \c open operation.
 *
 * \param inode device inode.
 * \param filp file pointer.
 *
 * Puts the dev->fops corresponding to the device minor number into
 * \p filp, call the \c open method, and restore the file operations.
 */
int drm_stub_open(struct inode *inode, struct file *filp)
{
	drm_device_t *dev = NULL;
	int minor = iminor(inode);
	int err = -ENODEV;
	struct file_operations *old_fops;

	DRM_DEBUG("\n");

	if (!((minor >= 0) && (minor < drm_cards_limit)))
		return -ENODEV;

	if (!drm_heads[minor])
		return -ENODEV;

	if (!(dev = drm_heads[minor]->dev))
		return -ENODEV;

	old_fops = filp->f_op;
	filp->f_op = fops_get(&dev->driver->fops);
	if (filp->f_op->open && (err = filp->f_op->open(inode, filp))) {
		fops_put(filp->f_op);
		filp->f_op = fops_get(old_fops);
	}
	fops_put(old_fops);

	return err;
}

/**
 * Get a secondary minor number.
 *
 * \param dev device data structure
 * \param sec-minor structure to hold the assigned minor
 * \return negative number on failure.
 *
 * Search an empty entry and initialize it to the given parameters, and
 * create the proc init entry via proc_init(). This routines assigns
 * minor numbers to secondary heads of multi-headed cards
 */
static int drm_get_head(drm_device_t * dev, drm_head_t * head)
{
	drm_head_t **heads = drm_heads;
	int ret;
	int minor;

	DRM_DEBUG("\n");

	for (minor = 0; minor < drm_cards_limit; minor++, heads++) {
		if (!*heads) {

			*head = (drm_head_t) {
			.dev = dev,.device =
				    MKDEV(DRM_MAJOR, minor),.minor = minor,};

			if ((ret =
			     drm_proc_init(dev, minor, drm_proc_root,
					   &head->dev_root))) {
				printk(KERN_ERR
				       "DRM: Failed to initialize /proc/dri.\n");
				goto err_g1;
			}

			head->dev_class = drm_sysfs_device_add(drm_class,
							       MKDEV(DRM_MAJOR,
								     minor),
							       &dev->pdev->dev,
							       "card%d", minor);
			if (IS_ERR(head->dev_class)) {
				printk(KERN_ERR
				       "DRM: Error sysfs_device_add.\n");
				ret = PTR_ERR(head->dev_class);
				goto err_g2;
			}
			*heads = head;

			DRM_DEBUG("new minor assigned %d\n", minor);
			return 0;
		}
	}
	DRM_ERROR("out of minors\n");
	return -ENOMEM;
      err_g2:
	drm_proc_cleanup(minor, drm_proc_root, head->dev_root);
      err_g1:
	*head = (drm_head_t) {
	.dev = NULL};
	return ret;
}

/**
 * Register.
 *
 * \param pdev - PCI device structure
 * \param ent entry from the PCI ID table with device type flags
 * \return zero on success or a negative number on failure.
 *
 * Attempt to gets inter module "drm" information. If we are first
 * then register the character device and inter module information.
 * Try and register, if we fail to register, backout previous work.
 */
int drm_get_dev(struct pci_dev *pdev, const struct pci_device_id *ent,
		struct drm_driver *driver)
{
	drm_device_t *dev;
	int ret;

	DRM_DEBUG("\n");

	dev = drm_calloc(1, sizeof(*dev), DRM_MEM_STUB);
	if (!dev)
		return -ENOMEM;

	pci_enable_device(pdev);

	if ((ret = drm_fill_in_dev(dev, pdev, ent, driver))) {
		printk(KERN_ERR "DRM: Fill_in_dev failed.\n");
		goto err_g1;
	}
	if ((ret = drm_get_head(dev, &dev->primary)))
		goto err_g1;

	/* postinit is a required function to display the signon banner */
	/* drivers add secondary heads here if needed */
	if ((ret = dev->driver->postinit(dev, ent->driver_data)))
		goto err_g1;

	return 0;

      err_g1:
	drm_free(dev, sizeof(*dev), DRM_MEM_STUB);
	return ret;
}

EXPORT_SYMBOL(drm_get_dev);

/**
 * Put a device minor number.
 *
 * \param dev device data structure
 * \return always zero
 *
 * Cleans up the proc resources. If it is the last minor then release the foreign
 * "drm" data, otherwise unregisters the "drm" data, frees the dev list and
 * unregisters the character device.
 */
int drm_put_dev(drm_device_t * dev)
{
	DRM_DEBUG("release primary %s\n", dev->driver->pci_driver.name);

	if (dev->unique) {
		drm_free(dev->unique, strlen(dev->unique) + 1, DRM_MEM_DRIVER);
		dev->unique = NULL;
		dev->unique_len = 0;
	}
	if (dev->devname) {
		drm_free(dev->devname, strlen(dev->devname) + 1,
			 DRM_MEM_DRIVER);
		dev->devname = NULL;
	}
	drm_free(dev, sizeof(*dev), DRM_MEM_STUB);
	return 0;
}

/**
 * Put a secondary minor number.
 *
 * \param sec_minor - structure to be released
 * \return always zero
 *
 * Cleans up the proc resources. Not legal for this to be the
 * last minor released.
 *
 */
int drm_put_head(drm_head_t * head)
{
	int minor = head->minor;

	DRM_DEBUG("release secondary minor %d\n", minor);

	drm_proc_cleanup(minor, drm_proc_root, head->dev_root);
	drm_sysfs_device_remove(MKDEV(DRM_MAJOR, head->minor));

	*head = (drm_head_t) {
	.dev = NULL};

	drm_heads[minor] = NULL;

	return 0;
}
Commit	Line	Data
1da177e4 LT	1	/**
	2	* \file drm_stub.h
	3	* Stub support
	4	*
	5	* \author Rickard E. (Rik) Faith <faith@valinux.com>
	6	*/
	7
	8	/*
	9	* Created: Fri Jan 19 10:48:35 2001 by faith@acm.org
	10	*
	11	* Copyright 2001 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	* PRECISION INSIGHT 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 OTHER
	31	* DEALINGS IN THE SOFTWARE.
	32	*/
	33
	34	#include <linux/module.h>
	35	#include <linux/moduleparam.h>
	36	#include "drmP.h"
	37	#include "drm_core.h"
	38
	39	unsigned int drm_cards_limit = 16; /* Enough for one machine */
b5e89ed5	40	unsigned int drm_debug = 0; /* 1 to enable debug output */
1da177e4 LT	41	EXPORT_SYMBOL(drm_debug);
1da177e4 LT	42
b5e89ed5 DA	43	MODULE_AUTHOR(CORE_AUTHOR);
b5e89ed5 DA	44	MODULE_DESCRIPTION(CORE_DESC);
1da177e4 LT	45	MODULE_LICENSE("GPL and additional rights");
	46	MODULE_PARM_DESC(cards_limit, "Maximum number of graphics cards");
	47	MODULE_PARM_DESC(debug, "Enable debug output");
	48
	49	module_param_named(cards_limit, drm_cards_limit, int, 0444);
	50	module_param_named(debug, drm_debug, int, 0666);
	51
	52	drm_head_t **drm_heads;
	53	struct drm_sysfs_class *drm_class;
	54	struct proc_dir_entry *drm_proc_root;
	55
b5e89ed5 DA	56	static int drm_fill_in_dev(drm_device_t * dev, struct pci_dev *pdev,
	57	const struct pci_device_id *ent,
	58	struct drm_driver *driver)
1da177e4 LT	59	{
	60	int retcode;
	61
	62	spin_lock_init(&dev->count_lock);
b5e89ed5 DA	63	init_timer(&dev->timer);
	64	sema_init(&dev->struct_sem, 1);
	65	sema_init(&dev->ctxlist_sem, 1);
1da177e4	66
b5e89ed5	67	dev->pdev = pdev;
1da177e4 LT	68
1da177e4 LT	69	#ifdef __alpha__
b5e89ed5	70	dev->hose = pdev->sysdata;
1da177e4 LT	71	dev->pci_domain = dev->hose->bus->number;
	72	#else
	73	dev->pci_domain = 0;
	74	#endif
	75	dev->pci_bus = pdev->bus->number;
	76	dev->pci_slot = PCI_SLOT(pdev->devfn);
	77	dev->pci_func = PCI_FUNC(pdev->devfn);
	78	dev->irq = pdev->irq;
	79
836cf046 DA	80	dev->maplist = drm_calloc(1, sizeof(*dev->maplist), DRM_MEM_MAPS);
	81	if (dev->maplist == NULL)
	82	return -ENOMEM;
	83	INIT_LIST_HEAD(&dev->maplist->head);
	84
1da177e4 LT	85	/* the DRM has 6 basic counters */
1da177e4 LT	86	dev->counters = 6;
b5e89ed5 DA	87	dev->types[0] = _DRM_STAT_LOCK;
	88	dev->types[1] = _DRM_STAT_OPENS;
	89	dev->types[2] = _DRM_STAT_CLOSES;
	90	dev->types[3] = _DRM_STAT_IOCTLS;
	91	dev->types[4] = _DRM_STAT_LOCKS;
	92	dev->types[5] = _DRM_STAT_UNLOCKS;
1da177e4 LT	93
1da177e4 LT	94	dev->driver = driver;
b5e89ed5	95
1da177e4 LT	96	if (dev->driver->preinit)
	97	if ((retcode = dev->driver->preinit(dev, ent->driver_data)))
	98	goto error_out_unreg;
	99
	100	if (drm_core_has_AGP(dev)) {
cda17380 DA	101	if (drm_device_is_agp(dev))
cda17380 DA	102	dev->agp = drm_agp_init(dev);
b5e89ed5 DA	103	if (drm_core_check_feature(dev, DRIVER_REQUIRE_AGP)
	104	&& (dev->agp == NULL)) {
	105	DRM_ERROR("Cannot initialize the agpgart module.\n");
1da177e4 LT	106	retcode = -EINVAL;
	107	goto error_out_unreg;
	108	}
	109	if (drm_core_has_MTRR(dev)) {
	110	if (dev->agp)
b5e89ed5 DA	111	dev->agp->agp_mtrr =
	112	mtrr_add(dev->agp->agp_info.aper_base,
	113	dev->agp->agp_info.aper_size *
	114	1024 * 1024, MTRR_TYPE_WRCOMB, 1);
1da177e4 LT	115	}
	116	}
	117
b5e89ed5 DA	118	retcode = drm_ctxbitmap_init(dev);
	119	if (retcode) {
	120	DRM_ERROR("Cannot allocate memory for context bitmap.\n");
1da177e4 LT	121	goto error_out_unreg;
	122	}
	123
	124	return 0;
b5e89ed5 DA	125
b5e89ed5 DA	126	error_out_unreg:
1da177e4 LT	127	drm_takedown(dev);
	128	return retcode;
	129	}
	130
	131	/**
	132	* File \c open operation.
	133	*
	134	* \param inode device inode.
	135	* \param filp file pointer.
	136	*
	137	* Puts the dev->fops corresponding to the device minor number into
	138	* \p filp, call the \c open method, and restore the file operations.
	139	*/
	140	int drm_stub_open(struct inode inode, struct file filp)
	141	{
	142	drm_device_t *dev = NULL;
	143	int minor = iminor(inode);
	144	int err = -ENODEV;
	145	struct file_operations *old_fops;
b5e89ed5	146
1da177e4 LT	147	DRM_DEBUG("\n");
	148
	149	if (!((minor >= 0) && (minor < drm_cards_limit)))
	150	return -ENODEV;
	151
	152	if (!drm_heads[minor])
	153	return -ENODEV;
b5e89ed5	154
1da177e4 LT	155	if (!(dev = drm_heads[minor]->dev))
	156	return -ENODEV;
	157
	158	old_fops = filp->f_op;
	159	filp->f_op = fops_get(&dev->driver->fops);
	160	if (filp->f_op->open && (err = filp->f_op->open(inode, filp))) {
	161	fops_put(filp->f_op);
	162	filp->f_op = fops_get(old_fops);
	163	}
	164	fops_put(old_fops);
	165
	166	return err;
	167	}
	168
1da177e4 LT	169	/**
	170	* Get a secondary minor number.
	171	*
	172	* \param dev device data structure
	173	* \param sec-minor structure to hold the assigned minor
	174	* \return negative number on failure.
	175	*
	176	* Search an empty entry and initialize it to the given parameters, and
	177	* create the proc init entry via proc_init(). This routines assigns
	178	* minor numbers to secondary heads of multi-headed cards
	179	*/
b5e89ed5	180	static int drm_get_head(drm_device_t * dev, drm_head_t * head)
1da177e4 LT	181	{
	182	drm_head_t **heads = drm_heads;
	183	int ret;
	184	int minor;
	185
	186	DRM_DEBUG("\n");
	187
	188	for (minor = 0; minor < drm_cards_limit; minor++, heads++) {
	189	if (!*heads) {
b5e89ed5	190
1da177e4	191	*head = (drm_head_t) {
b5e89ed5 DA	192	.dev = dev,.device =
	193	MKDEV(DRM_MAJOR, minor),.minor = minor,};
	194
	195	if ((ret =
	196	drm_proc_init(dev, minor, drm_proc_root,
	197	&head->dev_root))) {
	198	printk(KERN_ERR
	199	"DRM: Failed to initialize /proc/dri.\n");
1da177e4 LT	200	goto err_g1;
	201	}
	202
1da177e4 LT	203	head->dev_class = drm_sysfs_device_add(drm_class,
	204	MKDEV(DRM_MAJOR,
	205	minor),
	206	&dev->pdev->dev,
	207	"card%d", minor);
	208	if (IS_ERR(head->dev_class)) {
b5e89ed5 DA	209	printk(KERN_ERR
b5e89ed5 DA	210	"DRM: Error sysfs_device_add.\n");
1da177e4 LT	211	ret = PTR_ERR(head->dev_class);
	212	goto err_g2;
	213	}
	214	*heads = head;
	215
	216	DRM_DEBUG("new minor assigned %d\n", minor);
	217	return 0;
	218	}
	219	}
	220	DRM_ERROR("out of minors\n");
	221	return -ENOMEM;
b5e89ed5	222	err_g2:
1da177e4	223	drm_proc_cleanup(minor, drm_proc_root, head->dev_root);
b5e89ed5 DA	224	err_g1:
	225	*head = (drm_head_t) {
	226	.dev = NULL};
1da177e4 LT	227	return ret;
1da177e4 LT	228	}
b5e89ed5	229
c94f7029 DA	230	/**
	231	* Register.
	232	*
	233	* \param pdev - PCI device structure
	234	* \param ent entry from the PCI ID table with device type flags
	235	* \return zero on success or a negative number on failure.
	236	*
	237	* Attempt to gets inter module "drm" information. If we are first
	238	* then register the character device and inter module information.
	239	* Try and register, if we fail to register, backout previous work.
	240	*/
	241	int drm_get_dev(struct pci_dev pdev, const struct pci_device_id ent,
b5e89ed5	242	struct drm_driver *driver)
c94f7029 DA	243	{
	244	drm_device_t *dev;
	245	int ret;
	246
	247	DRM_DEBUG("\n");
	248
	249	dev = drm_calloc(1, sizeof(*dev), DRM_MEM_STUB);
	250	if (!dev)
	251	return -ENOMEM;
	252
	253	pci_enable_device(pdev);
	254
	255	if ((ret = drm_fill_in_dev(dev, pdev, ent, driver))) {
	256	printk(KERN_ERR "DRM: Fill_in_dev failed.\n");
	257	goto err_g1;
	258	}
	259	if ((ret = drm_get_head(dev, &dev->primary)))
	260	goto err_g1;
	261
	262	/* postinit is a required function to display the signon banner */
	263	/* drivers add secondary heads here if needed */
	264	if ((ret = dev->driver->postinit(dev, ent->driver_data)))
	265	goto err_g1;
	266
	267	return 0;
	268
b5e89ed5	269	err_g1:
c94f7029 DA	270	drm_free(dev, sizeof(*dev), DRM_MEM_STUB);
	271	return ret;
	272	}
b5e89ed5	273
c94f7029	274	EXPORT_SYMBOL(drm_get_dev);
1da177e4 LT	275
	276	/**
	277	* Put a device minor number.
	278	*
	279	* \param dev device data structure
	280	* \return always zero
	281	*
	282	* Cleans up the proc resources. If it is the last minor then release the foreign
	283	* "drm" data, otherwise unregisters the "drm" data, frees the dev list and
	284	* unregisters the character device.
	285	*/
	286	int drm_put_dev(drm_device_t * dev)
	287	{
	288	DRM_DEBUG("release primary %s\n", dev->driver->pci_driver.name);
	289
	290	if (dev->unique) {
	291	drm_free(dev->unique, strlen(dev->unique) + 1, DRM_MEM_DRIVER);
	292	dev->unique = NULL;
	293	dev->unique_len = 0;
	294	}
	295	if (dev->devname) {
	296	drm_free(dev->devname, strlen(dev->devname) + 1,
	297	DRM_MEM_DRIVER);
	298	dev->devname = NULL;
	299	}
	300	drm_free(dev, sizeof(*dev), DRM_MEM_STUB);
	301	return 0;
	302	}
	303
	304	/**
	305	* Put a secondary minor number.
	306	*
	307	* \param sec_minor - structure to be released
	308	* \return always zero
	309	*
	310	* Cleans up the proc resources. Not legal for this to be the
	311	* last minor released.
	312	*
	313	*/
b5e89ed5	314	int drm_put_head(drm_head_t * head)
1da177e4 LT	315	{
1da177e4 LT	316	int minor = head->minor;
b5e89ed5	317
1da177e4	318	DRM_DEBUG("release secondary minor %d\n", minor);
b5e89ed5	319
1da177e4 LT	320	drm_proc_cleanup(minor, drm_proc_root, head->dev_root);
1da177e4 LT	321	drm_sysfs_device_remove(MKDEV(DRM_MAJOR, head->minor));
b5e89ed5 DA	322
	323	*head = (drm_head_t) {
	324	.dev = NULL};
1da177e4 LT	325
1da177e4 LT	326	drm_heads[minor] = NULL;
b5e89ed5	327
1da177e4 LT	328	return 0;
1da177e4 LT	329	}