drm: device minor fixups and /proc fixups

This patch fixes up the DRM to do better minor number accounting
and /proc directory creation, the old code was buggy in a number
of situations with multiple cards, and rather ugly. It is also 
a step on the way to the drm_core module.

From: Jon Smirl and Dave Airlie
Signed-off-by: Dave Airlie <airlied@linux.ie>

drivers/char/drm/drmP.h

@@ -57,6 +57,7 @@
 #include <linux/jiffies.h>
 #include <linux/smp_lock.h>	/* For (un)lock_kernel */
 #include <linux/mm.h>
+#include <linux/cdev.h>
 #if defined(__alpha__) || defined(__powerpc__)
 #include <asm/pgtable.h> /* For pte_wrprotect */
 #endif
@@ -695,12 +696,31 @@ typedef struct drm_device {
 	drm_sigdata_t     sigdata; /**< For block_all_signals */
 	sigset_t          sigmask;
 
+	struct file_operations *fops;	/**< file operations */
+	struct proc_dir_entry  *dev_root; /**< proc directory entry */
+
 	struct            drm_driver_fn fn_tbl;
 	drm_local_map_t   *agp_buffer_map;
 	int               dev_priv_size;
 	u32               driver_features;
 } drm_device_t;
 
+typedef struct drm_minor {
+	enum {
+		DRM_MINOR_FREE = 0,
+		DRM_MINOR_PRIMARY,
+	} type;
+	drm_device_t *dev;
+	struct proc_dir_entry  *dev_root; /**< proc directory entry */
+} drm_minor_t;
+
+typedef struct drm_global {
+	unsigned int cards_limit;
+	drm_minor_t *minors;
+	struct class_simple *drm_class;
+	struct proc_dir_entry *proc_root;
+} drm_global_t;
+
 static __inline__ int drm_core_check_feature(struct drm_device *dev, int feature)
 {
 	return ((dev->driver_features & feature) ? 1 : 0);
@@ -921,13 +941,12 @@ extern int            DRM(agp_bind_memory)(DRM_AGP_MEM *handle, off_t start);
 extern int            DRM(agp_unbind_memory)(DRM_AGP_MEM *handle);
 
 				/* Stub support (drm_stub.h) */
-int                   DRM(stub_register)(const char *name,
-					 struct file_operations *fops,
-					 drm_device_t *dev);
-int                   DRM(stub_unregister)(int minor);
+extern int 	      DRM(probe)(struct pci_dev *pdev, const struct pci_device_id *ent);
+extern int 	      DRM(put_minor)(drm_device_t *dev);
+extern drm_global_t   *DRM(global);
 
 				/* Proc support (drm_proc.h) */
-extern struct proc_dir_entry *DRM(proc_init)(drm_device_t *dev,
+extern int            DRM(proc_init)(drm_device_t *dev,
 					     int minor,
 					     struct proc_dir_entry *root,
 					     struct proc_dir_entry **dev_root);

drivers/char/drm/drm_drv.h

@@ -74,10 +74,6 @@ __setup( DRIVER_NAME "=", DRM_OPTIONS_FUNC );
 #undef DRM_OPTIONS_FUNC
 #endif
 
-#define MAX_DEVICES 4
-static drm_device_t	DRM(device)[MAX_DEVICES];
-static int		DRM(numdevs) = 0;
-
 struct file_operations	DRM(fops) = {
 	.owner   = THIS_MODULE,
 	.open	 = DRM(open),
@@ -158,15 +154,6 @@ drm_ioctl_desc_t		  DRM(ioctls)[] = {
 
 #define DRIVER_IOCTL_COUNT	DRM_ARRAY_SIZE( DRM(ioctls) )
 
-#ifdef MODULE
-static char *drm_opts = NULL;
-#endif
-
-MODULE_AUTHOR( DRIVER_AUTHOR );
-MODULE_DESCRIPTION( DRIVER_DESC );
-MODULE_PARM( drm_opts, "s" );
-MODULE_LICENSE("GPL and additional rights");
-
 static int DRM(setup)( drm_device_t *dev )
 {
 	int i;
@@ -420,44 +407,19 @@ static struct pci_device_id DRM(pciidlist)[] = {
 	DRM(PCI_IDS)
 };
 
-static int DRM(probe)(struct pci_dev *pdev)
+int DRM(fill_in_dev)(drm_device_t *dev, struct pci_dev *pdev, const struct pci_device_id *ent)
 {
-	drm_device_t *dev;
 	int retcode;
-	int i;
-	int is_compat = 0;
-
-	DRM_DEBUG( "\n" );
-
-	for (i = 0; DRM(pciidlist)[i].vendor != 0; i++) {
-		if ((DRM(pciidlist)[i].vendor == pdev->vendor) &&
-		    (DRM(pciidlist)[i].device == pdev->device)) {
-			is_compat = 1;
-		}
-	}
-	if (is_compat == 0)
-		return -ENODEV;
-
-	if (DRM(numdevs) >= MAX_DEVICES)
-		return -ENODEV;
-
-	if ((retcode=pci_enable_device(pdev)))
-		return retcode;
 
-	dev = &(DRM(device)[DRM(numdevs)]);
-
-	memset( (void *)dev, 0, sizeof(*dev) );
 	dev->count_lock = SPIN_LOCK_UNLOCKED;
 	init_timer( &dev->timer );
 	sema_init( &dev->struct_sem, 1 );
 	sema_init( &dev->ctxlist_sem, 1 );
 
-	if ((dev->minor = DRM(stub_register)(DRIVER_NAME, &DRM(fops),dev)) < 0)
-		return -EPERM;
-	dev->device = MKDEV(DRM_MAJOR, dev->minor );
 	dev->name   = DRIVER_NAME;
-
+	dev->fops   = &DRM(fops);
 	dev->pdev   = pdev;
+
 #ifdef __alpha__
 	dev->hose   = pdev->sysdata;
 	dev->pci_domain = dev->hose->bus->number;
@@ -486,16 +448,15 @@ static int DRM(probe)(struct pci_dev *pdev)
 	DRM(driver_register_fns)(dev);
 
 	if (dev->fn_tbl.preinit)
-	  dev->fn_tbl.preinit(dev);
+		if ((retcode = dev->fn_tbl.preinit(dev)))
+			goto error_out_unreg;
 
-	if (drm_core_has_AGP(dev))
-	{
+	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" );
-			DRM(stub_unregister)(dev->minor);
-			DRM(takedown)( dev );
-			return -EINVAL;
+			retcode = -EINVAL;
+			goto error_out_unreg;
 		}
 		if (drm_core_has_MTRR(dev)) {
 			if (dev->agp)
@@ -509,12 +470,10 @@ static int DRM(probe)(struct pci_dev *pdev)
 	retcode = DRM(ctxbitmap_init)( dev );
 	if( retcode ) {
 		DRM_ERROR( "Cannot allocate memory for context bitmap.\n" );
-		DRM(stub_unregister)(dev->minor);
-		DRM(takedown)( dev );
-		return retcode;
+		goto error_out_unreg;
 	}
 
-	DRM(numdevs)++; /* no errors, mark it reserved */
+	dev->device = MKDEV(DRM_MAJOR, dev->minor );
 
 	DRM_INFO( "Initialized %s %d.%d.%d %s on minor %d: %s\n",
 		DRIVER_NAME,
@@ -526,11 +485,21 @@ static int DRM(probe)(struct pci_dev *pdev)
 		pci_pretty_name(pdev));
 
 	if (dev->fn_tbl.postinit)
-	  dev->fn_tbl.postinit(dev);
+		if ((retcode = dev->fn_tbl.postinit(dev)))
+			goto error_out_unreg;
 
 	return 0;
+	
+error_out_unreg:
+	DRM(takedown)(dev);
+	return retcode;
 }
 
+#ifdef MODULE
+static char *drm_opts = NULL;
+#endif
+MODULE_PARM( drm_opts, "s" );
+
 /**
  * Module initialization. Called via init_module at module load time, or via
  * linux/init/main.c (this is not currently supported).
@@ -547,6 +516,8 @@ static int DRM(probe)(struct pci_dev *pdev)
 static int __init drm_init( void )
 {
 	struct pci_dev *pdev = NULL;
+	struct pci_device_id *pid;
+	int i;
 
 	DRM_DEBUG( "\n" );
 
@@ -556,8 +527,16 @@ static int __init drm_init( void )
 
 	DRM(mem_init)();
 
-	while ((pdev = pci_find_device(PCI_ANY_ID, PCI_ANY_ID, pdev)) != NULL) {
-		DRM(probe)(pdev);
+	for (i=0; DRM(pciidlist)[i].vendor != 0; i++) {
+		pid = &DRM(pciidlist[i]);
+		
+		pdev=NULL;
+		/* pass back in pdev to account for multiple identical cards */		
+		while ((pdev = pci_get_subsys(pid->vendor, pid->device, pid->subvendor, pid->subdevice, pdev)) != NULL) {
+			/* stealth mode requires a manual probe */
+			pci_dev_get(pdev);
+			DRM(probe)(pdev, pid);
+		}
 	}
 	return 0;
 }
@@ -569,24 +548,17 @@ static int __init drm_init( void )
  * 
  * \sa drm_init().
  */
-static void __exit drm_cleanup( void )
+static void __exit drm_cleanup( drm_device_t *dev )
 {
-	drm_device_t *dev;
-	int i;
-
 	DRM_DEBUG( "\n" );
 
-	for (i = DRM(numdevs) - 1; i >= 0; i--) {
-		dev = &(DRM(device)[i]);
-		if ( DRM(stub_unregister)(dev->minor) ) {
-			DRM_ERROR( "Cannot unload module\n" );
-		} else {
-			DRM_DEBUG("minor %d unregistered\n", dev->minor);
-			if (i == 0) {
-				DRM_INFO( "Module unloaded\n" );
-			}
+	if (!dev) {
+		DRM_ERROR("cleanup called no dev\n");
+		return;
 	}
 
+	DRM(takedown)( dev );	
+
 	DRM(ctxbitmap_cleanup)( dev );
 	
 	if (drm_core_has_MTRR(dev) && drm_core_has_AGP(dev) &&
@@ -598,8 +570,6 @@ static void __exit drm_cleanup( void )
 		DRM_DEBUG( "mtrr_del=%d\n", retval );
 	}
 	
-		DRM(takedown)( dev );
-
 	if (drm_core_has_AGP(dev) && dev->agp ) {
 		DRM(agp_uninit)();
 		DRM(free)( dev->agp, sizeof(*dev->agp), DRM_MEM_AGPLISTS );
@@ -609,12 +579,37 @@ static void __exit drm_cleanup( void )
 	if (dev->fn_tbl.postcleanup)
 		dev->fn_tbl.postcleanup(dev);
 	
+	if ( DRM(put_minor)(dev) )
+		DRM_ERROR( "Cannot unload module\n" );
+}
+
+
+static void __exit drm_exit (void)
+{
+	int i;
+	drm_device_t *dev;
+	drm_minor_t *minor;
+	
+	DRM_DEBUG( "\n" );
+
+	if (DRM(global)) {
+		for (i = 0; DRM(global) && (i < DRM(global)->cards_limit); i++) {
+			minor = &DRM(global)->minors[i];
+			dev = minor->dev;
+
+			if ((minor->type == DRM_MINOR_PRIMARY) && (dev->fops == &DRM(fops))) {
+				/* release the pci driver */
+				if (dev->pdev)
+					pci_dev_put(dev->pdev);
+				drm_cleanup(dev);
+			}
+		}
 	} 
-	DRM(numdevs) = 0;
+	DRM_INFO( "Module unloaded\n" );
 }
 
 module_init( drm_init );
-module_exit( drm_cleanup );
+module_exit( drm_exit );
 
 
 /**
@@ -674,18 +669,15 @@ int DRM(version)( struct inode *inode, struct file *filp,
 int DRM(open)( struct inode *inode, struct file *filp )
 {
 	drm_device_t *dev = NULL;
+	int minor = iminor(inode);
 	int retcode = 0;
-	int i;
 
-	for (i = 0; i < DRM(numdevs); i++) {
-		if (iminor(inode) == DRM(device)[i].minor) {
-			dev = &(DRM(device)[i]);
-			break;
-		}
-	}
-	if (!dev) {
+	if (!((minor >= 0) && (minor < DRM(global)->cards_limit)))
+		return -ENODEV;
+		
+	dev = DRM(global)->minors[minor].dev;
+	if (!dev)
 		return -ENODEV;
-	}
 	
 	retcode = DRM(open_helper)( inode, filp, dev );
 	if ( !retcode ) {

drivers/char/drm/drm_proc.h

@@ -86,7 +86,7 @@ struct drm_proc_list {
  * "/proc/dri/%minor%/", and each entry in proc_list as
  * "/proc/dri/%minor%/%name%".
  */
-struct proc_dir_entry *DRM(proc_init)(drm_device_t *dev, int minor,
+int DRM(proc_init)(drm_device_t *dev, int minor,
 		    struct proc_dir_entry *root,
 		    struct proc_dir_entry **dev_root)
 {
@@ -94,17 +94,11 @@ struct proc_dir_entry *DRM(proc_init)(drm_device_t *dev, int minor,
 	int		      i, j;
 	char                  name[64];
 
-	if (!minor) root = create_proc_entry("dri", S_IFDIR, NULL);
-	if (!root) {
-		DRM_ERROR("Cannot create /proc/dri\n");
-		return NULL;
-	}
-
 	sprintf(name, "%d", minor);
 	*dev_root = create_proc_entry(name, S_IFDIR, root);
 	if (!*dev_root) {
 		DRM_ERROR("Cannot create /proc/dri/%s\n", name);
-		return NULL;
+		return -1;
 	}
 
 	for (i = 0; i < DRM_PROC_ENTRIES; i++) {
@@ -117,14 +111,13 @@ struct proc_dir_entry *DRM(proc_init)(drm_device_t *dev, int minor,
 				remove_proc_entry(DRM(proc_list)[i].name,
 						  *dev_root);
 			remove_proc_entry(name, root);
-			if (!minor) remove_proc_entry("dri", NULL);
-			return NULL;
+			return -1;
 		}
 		ent->read_proc = DRM(proc_list)[i].f;
 		ent->data      = dev;
 	}
 
-	return root;
+	return 0;
 }
 
 
@@ -150,7 +143,6 @@ int DRM(proc_cleanup)(int minor, struct proc_dir_entry *root,
 		remove_proc_entry(DRM(proc_list)[i].name, dev_root);
 	sprintf(name, "%d", minor);
 	remove_proc_entry(name, root);
-	if (!minor) remove_proc_entry("dri", NULL);
 
 	return 0;
 }

drivers/char/drm/drm_stub.h

@@ -33,25 +33,19 @@
 
 #include "drmP.h"
 
-#define DRM_STUB_MAXCARDS 16	/* Enough for one machine */
+static unsigned int cards_limit = 16;	/* Enough for one machine */
+static unsigned int debug = 0;		/* 1 to enable debug output */
 
-static struct class_simple *drm_class;
+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");
 
-/** Stub list. One for each minor. */
-static struct drm_stub_list {
-	const char             *name;
-	struct file_operations *fops;	/**< file operations */
-	struct proc_dir_entry  *dev_root;	/**< proc directory entry */
-} *DRM(stub_list);
+module_param(cards_limit, int, 0444);
+module_param(debug, int, 0666);
 
-static struct proc_dir_entry *DRM(stub_root);
-
-/** Stub information */
-static struct drm_stub_info {
-	int (*info_register)(const char *name, struct file_operations *fops,
-			     drm_device_t *dev);
-	int (*info_unregister)(int minor);
-} DRM(stub_info);
+drm_global_t *DRM(global);
 
 /**
  * File \c open operation.
@@ -59,18 +53,27 @@ static struct drm_stub_info {
  * \param inode device inode.
  * \param filp file pointer.
  *
- * Puts the drm_stub_list::fops corresponding to the device minor number into
+ * Puts the dev->fops corresponding to the device minor number into
  * \p filp, call the \c open method, and restore the file operations.
  */
-static int DRM(stub_open)(struct inode *inode, struct file *filp)
+static int 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;
 	
-	if (!DRM(stub_list) || !DRM(stub_list)[minor].fops) return -ENODEV;
+	DRM_DEBUG("\n");
+
+	if (!((minor >= 0) && (minor < DRM(global)->cards_limit)))
+		return -ENODEV;
+
+	dev = DRM(global)->minors[minor].dev;
+	if (!dev)
+		return -ENODEV;
+
 	old_fops = filp->f_op;
-	filp->f_op = fops_get(DRM(stub_list)[minor].fops);
+	filp->f_op = fops_get(dev->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);
@@ -83,49 +86,73 @@ static int DRM(stub_open)(struct inode *inode, struct file *filp)
 /** File operations structure */
 static struct file_operations DRM(stub_fops) = {
 	.owner = THIS_MODULE,
-	.open  = DRM(stub_open)
+	.open  = stub_open
 };
 
 /**
  * Get a device minor number.
  *
- * \param name driver name.
- * \param fops file operations.
- * \param dev DRM device.
- * \return minor number on success, or a negative number on failure.
+ * \param pdev PCI device structure
+ * \param ent entry from the PCI ID table with device type flags
+ * \return negative number on failure.
  *
- * Allocate and initialize ::stub_list if one doesn't exist already.  Search an
- * empty entry and initialize it to the given parameters, and create the proc
- * init entry via proc_init().
+ * Search an empty entry and initialize it to the given parameters, and 
+ * create the proc init entry via proc_init().
  */
-static int DRM(stub_getminor)(const char *name, struct file_operations *fops,
-			      drm_device_t *dev)
+static int get_minor(struct pci_dev *pdev, const struct pci_device_id *ent)
 {
-	int i;
+	struct class_device *dev_class;
+	drm_device_t *dev;
+	int ret;
+	int minor;
+	drm_minor_t *minors = &DRM(global)->minors[0];
 
-	if (!DRM(stub_list)) {
-		DRM(stub_list) = DRM(alloc)(sizeof(*DRM(stub_list))
-					    * DRM_STUB_MAXCARDS, DRM_MEM_STUB);
-		if(!DRM(stub_list)) return -1;
-		for (i = 0; i < DRM_STUB_MAXCARDS; i++) {
-			DRM(stub_list)[i].name = NULL;
-			DRM(stub_list)[i].fops = NULL;
+	DRM_DEBUG("\n");
+
+	for (minor=0; minor<DRM(global)->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;
+			if ((ret=DRM(fill_in_dev)(dev, pdev, ent))) {
+				printk(KERN_ERR "DRM: Fill_in_dev failed.\n");
+				goto err_g1;
 			}
+			if ((ret = DRM(proc_init)(dev, minor, DRM(global)->proc_root, &dev->dev_root))) {
+				printk (KERN_ERR "DRM: Failed to initialize /proc/dri.\n");
+				goto err_g1;
+			}
+
+			pci_enable_device(pdev);
+			
+			dev_class = class_simple_device_add(DRM(global)->drm_class, 
+							    MKDEV(DRM_MAJOR, minor), &pdev->dev, "card%d", minor);
+			if (IS_ERR(dev_class)) {
+				printk(KERN_ERR "DRM: Error class_simple_device_add.\n");
+				ret = PTR_ERR(dev_class);
+				goto err_g2;
 			}
-	for (i = 0; i < DRM_STUB_MAXCARDS; i++) {
-		if (!DRM(stub_list)[i].fops) {
-			DRM(stub_list)[i].name = name;
-			DRM(stub_list)[i].fops = fops;
-			DRM(stub_root) = DRM(proc_init)(dev, i, DRM(stub_root),
-							&DRM(stub_list)[i]
-							.dev_root);
-			class_simple_device_add(drm_class, MKDEV(DRM_MAJOR, i), NULL, name);
-			return i;
+			
+			DRM_DEBUG("new minor assigned %d\n", minor);
+			return 0;
 		}
 	}
-	return -1;
+	DRM_ERROR("out of minors\n");
+	return -ENOMEM;
+err_g2:
+	DRM(proc_cleanup)(minor, DRM(global)->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;
 }
 		
+
 /**
  * Put a device minor number.
  *
@@ -136,101 +163,112 @@ static int DRM(stub_getminor)(const char *name, struct file_operations *fops,
  * "drm" data, otherwise unregisters the "drm" data, frees the stub list and
  * unregisters the character device. 
  */
-static int DRM(stub_putminor)(int minor)
+int DRM(put_minor)(drm_device_t *dev)
 {
-	if (minor < 0 || minor >= DRM_STUB_MAXCARDS) return -1;
-	DRM(stub_list)[minor].name = NULL;
-	DRM(stub_list)[minor].fops = NULL;
-	DRM(proc_cleanup)(minor, DRM(stub_root),
-			  DRM(stub_list)[minor].dev_root);
-	if (minor) {
-		class_simple_device_remove(MKDEV(DRM_MAJOR, minor));
+	drm_minor_t *minors = &DRM(global)->minors[dev->minor];
+	int i;
+	
+	DRM_DEBUG("release minor %d\n", dev->minor);
+	
+	DRM(proc_cleanup)(dev->minor, DRM(global)->proc_root, dev->dev_root);
+	class_simple_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);
+	
+	/* if any device pointers are non-NULL we are not the last module */
+	for (i=0; i<DRM(global)->cards_limit; i++) {
+		if (DRM(global)->minors[i].type != DRM_MINOR_FREE) {
+			DRM_DEBUG("inter_module_put called\n");
 			inter_module_put("drm");
-	} else {
+			return 0;
+		}
+	}
+	DRM_DEBUG("unregistering inter_module.\n");
 	inter_module_unregister("drm");
-		DRM(free)(DRM(stub_list),
-			  sizeof(*DRM(stub_list)) * DRM_STUB_MAXCARDS,
-			  DRM_MEM_STUB);
+	remove_proc_entry("dri", NULL);
+	class_simple_destroy(DRM(global)->drm_class);
+
 	unregister_chrdev(DRM_MAJOR, "drm");
-		class_simple_device_remove(MKDEV(DRM_MAJOR, minor));
-		class_simple_destroy(drm_class);
-	}
+	DRM(free)(DRM(global)->minors, sizeof(*DRM(global)->minors) * 
+		  DRM(global)->cards_limit, DRM_MEM_STUB);
+	DRM(free)(DRM(global), sizeof(*DRM(global)), DRM_MEM_STUB);
+	DRM(global) = NULL;
+
 	return 0;
 }
 
 /**
  * Register.
  *
- * \param name driver name.
- * \param fops file operations
- * \param dev DRM device.
+ * \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 register the char device and get the foreign "drm" data. If
- * successful then another module already registered so gets the stub info,
- * otherwise use this module stub info and make it available for other modules.
- *
- * Finally calls stub_info::info_register.
+ * 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(stub_register)(const char *name, struct file_operations *fops,
-		       drm_device_t *dev)
+int DRM(probe)(struct pci_dev *pdev, const struct pci_device_id *ent)
 {
-	struct drm_stub_info *i = NULL;
-	int ret1;
-	int ret2;
+	drm_global_t *global;
+	int ret = -ENOMEM;
 
 	DRM_DEBUG("\n");
-	ret1 = register_chrdev(DRM_MAJOR, "drm", &DRM(stub_fops));
-	if (!ret1) {
-		drm_class = class_simple_create(THIS_MODULE, "drm");
-		if (IS_ERR(drm_class)) {
-			printk (KERN_ERR "Error creating drm class.\n");
-			unregister_chrdev(DRM_MAJOR, "drm");
-			return PTR_ERR(drm_class);
+
+	/* use the inter_module_get to check - as if the same module
+		registers chrdev twice it succeeds */
+	global = (drm_global_t *)inter_module_get("drm");
+	if (global) {
+		DRM(global) = global;
+		global = NULL;
+	} else {
+		DRM_DEBUG("first probe\n");
+
+		global = DRM(calloc)(1, sizeof(*global), DRM_MEM_STUB);
+		if(!global) 
+			return -ENOMEM;
+
+		global->cards_limit = (cards_limit < DRM_MAX_MINOR + 1 ? cards_limit : DRM_MAX_MINOR + 1);
+		global->minors = DRM(calloc)(global->cards_limit, 
+					sizeof(*global->minors), DRM_MEM_STUB);
+		if(!global->minors) 
+			goto err_p1;
+
+		if (register_chrdev(DRM_MAJOR, "drm", &DRM(stub_fops)))
+			goto err_p1;
+	
+		global->drm_class = class_simple_create(THIS_MODULE, "drm");
+		if (IS_ERR(global->drm_class)) {
+			printk (KERN_ERR "DRM: Error creating drm class.\n");
+			ret = PTR_ERR(global->drm_class);
+			goto err_p2;
 		}
+
+		global->proc_root = create_proc_entry("dri", S_IFDIR, NULL);
+		if (!global->proc_root) {
+			DRM_ERROR("Cannot create /proc/dri\n");
+			ret = -1;
+			goto err_p3;
 		}
-	else if (ret1 == -EBUSY)
-		i = (struct drm_stub_info *)inter_module_get("drm");
-	else
-		return -1;
-
-	if (i) {
-				/* Already registered */
-		DRM(stub_info).info_register   = i->info_register;
-		DRM(stub_info).info_unregister = i->info_unregister;
-		DRM_DEBUG("already registered\n");
-	} else if (DRM(stub_info).info_register != DRM(stub_getminor)) {
-		DRM(stub_info).info_register   = DRM(stub_getminor);
-		DRM(stub_info).info_unregister = DRM(stub_putminor);
 		DRM_DEBUG("calling inter_module_register\n");
-		inter_module_register("drm", THIS_MODULE, &DRM(stub_info));
-	}
-	if (DRM(stub_info).info_register) {
-		ret2 = DRM(stub_info).info_register(name, fops, dev);
-		if (ret2) {
-			if (!ret1) {
-				unregister_chrdev(DRM_MAJOR, "drm");
-				class_simple_destroy(drm_class);
-			}
-			if (!i)
-				inter_module_unregister("drm");
+		inter_module_register("drm", THIS_MODULE, global);
+		
+		DRM(global) = global;
 	}
-		return ret2;
+	if ((ret = get_minor(pdev, ent))) {
+		if (global)
+			goto err_p3;
+		return ret;
 	}
-	return -1;
-}
-
-/**
- * Unregister.
- *
- * \param minor
- *
- * Calls drm_stub_info::unregister.
- */
-int DRM(stub_unregister)(int minor)
-{
-	DRM_DEBUG("%d\n", minor);
-	if (DRM(stub_info).info_unregister)
-		return DRM(stub_info).info_unregister(minor);
-	return -1;
+	return 0;
+err_p3:
+	class_simple_destroy(global->drm_class);
+err_p2:
+	unregister_chrdev(DRM_MAJOR, "drm");
+	DRM(free)(global->minors, sizeof(*global->minors) * global->cards_limit, DRM_MEM_STUB);
+err_p1:	
+	DRM(free)(global, sizeof(*global), DRM_MEM_STUB);
+	DRM(global) = NULL;
+	return ret;
 }