drm/linux-core/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 "drmP.h"
#include "drm_core.h"

unsigned int cards_limit = 16;	/* Enough for one machine */
unsigned int debug = 0;		/* 1 to enable debug output */

MODULE_AUTHOR(DRIVER_AUTHOR);
MODULE_DESCRIPTION(DRIVER_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(cards_limit, int, 0444);
module_param(debug, int, 0666);

drm_minor_t *drm_minors;
struct drm_sysfs_class *drm_class;
struct proc_dir_entry *drm_proc_root;

static int fill_in_dev(drm_device_t * dev, struct pci_dev *pdev,
		       const struct pci_device_id *ent,
		       struct drm_driver_fn *driver_fn)
{
	int retcode;

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

	dev->name = DRIVER_NAME;
	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 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->fn_tbl = driver_fn;

	if (dev->fn_tbl->preinit)
		if ((retcode = dev->fn_tbl->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 */
	/* drivers add secondary heads here if needed */
	if ((retcode = dev->fn_tbl->postinit(dev, ent->driver_data)))
		goto error_out_unreg;

	return 0;

      error_out_unreg:
	drm_takedown(dev);
	return retcode;
}

/**
 * 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_probe(struct pci_dev *pdev, const struct pci_device_id *ent,
	      struct drm_driver_fn *driver_fn)
{
	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 < cards_limit; minor++, minors++) {
		if (minors->class == 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,.class = DRM_MINOR_PRIMARY};
			dev->minor = minor;
			if (!drm_fb_loaded) {
				pci_set_drvdata(pdev, dev);
				pci_request_regions(pdev, DRIVER_NAME);
				pci_enable_device(pdev);
			}
			if ((ret = fill_in_dev(dev, pdev, ent, driver_fn))) {
				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),
							 DRM_PCI_DEV(pdev),
							 "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 primary 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:
	if (!drm_fb_loaded) {
		pci_set_drvdata(pdev, NULL);
		pci_release_regions(pdev);
		pci_disable_device(pdev);
	}
	*minors = (drm_minor_t) {
		.dev = NULL,.class = DRM_MINOR_FREE};
	drm_free(dev, sizeof(*dev), DRM_MEM_STUB);
	return ret;
}
EXPORT_SYMBOL(drm_probe);

/**
 * 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
 */
int drm_get_secondary_minor(drm_device_t * dev, drm_minor_t ** sec_minor)
{
	drm_minor_t *minors = &drm_minors[0];
	struct class_device *dev_class;
	int ret;
	int minor;

	DRM_DEBUG("\n");

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

			*minors = (drm_minor_t) {
			.dev = dev,.class = DRM_MINOR_SECONDARY};
			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),
							 DRM_PCI_DEV(dev->pdev),
							 "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;
			}
			*sec_minor = minors;

			DRM_DEBUG("new secondary 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,.class = DRM_MINOR_FREE};
	drm_free(dev, sizeof(*dev), DRM_MEM_STUB);
	return ret;
}

/**
 * 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_minor(drm_device_t * dev)
{
	drm_minor_t *minors = &drm_minors[dev->minor];

	DRM_DEBUG("release primary 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,.class = DRM_MINOR_FREE};
	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_secondary_minor(drm_minor_t * sec_minor)
{
	int minor = sec_minor - &drm_minors[0];

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

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

	*sec_minor = (drm_minor_t) {
	.dev = NULL,.class = DRM_MINOR_FREE};

	return 0;
}