diff options
Diffstat (limited to 'drivers/char/drm/drm_stub.c')
| -rw-r--r-- | drivers/char/drm/drm_stub.c | 319 |
1 files changed, 319 insertions, 0 deletions
diff --git a/drivers/char/drm/drm_stub.c b/drivers/char/drm/drm_stub.c new file mode 100644 index 000000000000..8ccbdef7bb3e --- /dev/null +++ b/drivers/char/drm/drm_stub.c @@ -0,0 +1,319 @@ +/** + * \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; + + /* 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(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; +} + + +/** + * 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); + +/** + * 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_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; +} + + +/** + * 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; +} + |