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;
+}
+