drivers/char/drm/drm_stub.c - third_party/linux - Git at Google

 /**
  * \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( DRIVER_AUTHOR );
 MODULE_DESCRIPTION( DRIVER_DESC );
 MODULE_LICENSE("GPL and additional rights");
 MODULE_PARM_DESC(drm_cards_limit, "Maximum number of graphics cards");
 MODULE_PARM_DESC(drm_debug, "Enable debug output");

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

 drm_minor_t *drm_minors;
 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;

 	/* 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)) {
 		dev->agp = drm_agp_init();
 		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;
 	}

 	dev->device = MKDEV(DRM_MAJOR, dev->minor );

 	/* postinit is a required function to display the signon banner */
 	if ((retcode = dev->driver->postinit(dev, ent->driver_data)))
 		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;

 	dev = drm_minors[minor].dev;
 	if (!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 device minor number.
  *
  * \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_probe(struct pci_dev *pdev, const struct pci_device_id *ent, struct drm_driver *driver)
 {
 	struct class_device *dev_class;
 	drm_device_t *dev;
 	int ret;
 	int minor;
 	drm_minor_t *minors = &drm_minors[0];

 	DRM_DEBUG("\n");

 	for (minor = 0; minor < drm_cards_limit; minor++, minors++) {
 		if (minors->type == DRM_MINOR_FREE) {

 			DRM_DEBUG("assigning minor %d\n", minor);
 			dev = drm_calloc(1, sizeof(*dev), DRM_MEM_STUB);
 			if (!dev)
 				return -ENOMEM;

 			*minors = (drm_minor_t){.dev = dev, .type=DRM_MINOR_PRIMARY};
 			dev->minor = minor;

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


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

 			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, minors->dev_root);
 err_g1:
 	*minors = (drm_minor_t){.dev = NULL, .type = DRM_MINOR_FREE};
 	drm_free(dev, sizeof(*dev), DRM_MEM_STUB);
 	return ret;
 }
 EXPORT_SYMBOL(drm_probe);


 /**
  * Put a device minor number.
  *
  * \param minor minor number.
  * \return always zero.
  *
  * Cleans up the proc resources. If a minor is zero then release the foreign
  * "drm" data, otherwise unregisters the "drm" data, frees the stub list and
  * unregisters the character device.
  */
 int drm_put_minor(drm_device_t *dev)
 {
 	drm_minor_t *minors = &drm_minors[dev->minor];

 	DRM_DEBUG("release minor %d\n", dev->minor);

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

 	*minors = (drm_minor_t){.dev = NULL, .type = DRM_MINOR_FREE};
 	drm_free(dev, sizeof(*dev), DRM_MEM_STUB);

 	return 0;
 }
	/**
	* \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( DRIVER_AUTHOR );
	MODULE_DESCRIPTION( DRIVER_DESC );
	MODULE_LICENSE("GPL and additional rights");
	MODULE_PARM_DESC(drm_cards_limit, "Maximum number of graphics cards");
	MODULE_PARM_DESC(drm_debug, "Enable debug output");

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

	drm_minor_t *drm_minors;
	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;

	/* 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)) {
	dev->agp = drm_agp_init();
	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_size10241024,
	MTRR_TYPE_WRCOMB,
	1 );
	}
	}

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

	dev->device = MKDEV(DRM_MAJOR, dev->minor );

	/* postinit is a required function to display the signon banner */
	if ((retcode = dev->driver->postinit(dev, ent->driver_data)))
	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;

	dev = drm_minors[minor].dev;
	if (!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 device minor number.
	*
	* \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_probe(struct pci_dev pdev, const struct pci_device_id ent, struct drm_driver *driver)
	{
	struct class_device *dev_class;
	drm_device_t *dev;
	int ret;
	int minor;
	drm_minor_t *minors = &drm_minors[0];

	DRM_DEBUG("\n");

	for (minor = 0; minor < drm_cards_limit; minor++, minors++) {
	if (minors->type == DRM_MINOR_FREE) {

	DRM_DEBUG("assigning minor %d\n", minor);
	dev = drm_calloc(1, sizeof(*dev), DRM_MEM_STUB);
	if (!dev)
	return -ENOMEM;

	*minors = (drm_minor_t){.dev = dev, .type=DRM_MINOR_PRIMARY};
	dev->minor = minor;

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


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

	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, minors->dev_root);
	err_g1:
	*minors = (drm_minor_t){.dev = NULL, .type = DRM_MINOR_FREE};
	drm_free(dev, sizeof(*dev), DRM_MEM_STUB);
	return ret;
	}
	EXPORT_SYMBOL(drm_probe);


	/**
	* Put a device minor number.
	*
	* \param minor minor number.
	* \return always zero.
	*
	* Cleans up the proc resources. If a minor is zero then release the foreign
	* "drm" data, otherwise unregisters the "drm" data, frees the stub list and
	* unregisters the character device.
	*/
	int drm_put_minor(drm_device_t *dev)
	{
	drm_minor_t *minors = &drm_minors[dev->minor];

	DRM_DEBUG("release minor %d\n", dev->minor);

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

	*minors = (drm_minor_t){.dev = NULL, .type = DRM_MINOR_FREE};
	drm_free(dev, sizeof(*dev), DRM_MEM_STUB);

	return 0;
	}