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Dynamic device minor support. Minor device numbers will be reused if the 

device is hotplugged in/out of the system
main
Jon Smirl 2004-09-15 00:20:21 +00:00
parent 03c2e674e4
commit 64ef12c55c
8 changed files with 620 additions and 510 deletions
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32
linux-core/drmP.h
View File

@ -56,6 +56,7 @@
#include <linux/smp_lock.h> /* For (un)lock_kernel */
#include <linux/mm.h>
#include <linux/pagemap.h>
#include <linux/cdev.h>
#if defined(__alpha__) || defined(__powerpc__)
#include <asm/pgtable.h> /* For pte_wrprotect */
#endif
@ -554,7 +555,6 @@ typedef struct drm_device {
int if_version; /**< Highest interface version set */
int blocked; /**< Blocked due to VC switch? */
struct proc_dir_entry *root; /**< Root for this device's entries */
/** \name Locks */
/*@{*/
@ -673,12 +673,33 @@ typedef struct drm_device {
sigset_t sigmask;
int need_reset; /**< secondary device needing reset */
struct file_operations *fops; /**< file operations */
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,
DRM_MINOR_SECONDARY,
} class;
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;
struct cdev drm_cdev;
} drm_global_t;
static __inline__ int drm_core_check_feature(struct drm_device *dev, int feature)
{
return ((dev->driver_features & feature) ? 1 : 0);
@ -904,10 +925,11 @@ 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 int DRM(get_secondary_minor)(drm_device_t *dev, drm_minor_t **sec_minor);
extern int DRM(put_secondary_minor)(drm_minor_t *sec_minor);
extern drm_global_t *DRM(global);
/* Proc support (drm_proc.h) */
extern int DRM(proc_init)(drm_device_t *dev,

140
linux-core/drm_drv.c
View File

@ -62,17 +62,6 @@
static void __exit drm_cleanup( drm_device_t *dev );
/** Stub information */
struct drm_stub_info {
int (*info_register)(const char *name, struct file_operations *fops,
drm_device_t *dev);
int (*info_unregister)(int minor);
struct class_simple *drm_class;
int *info_count;
struct proc_dir_entry *proc_root;
};
extern struct drm_stub_info DRM(stub_info);
#ifndef MODULE
/** Use an additional macro to avoid preprocessor troubles */
#define DRM_OPTIONS_FUNC DRM(options)
@ -91,9 +80,6 @@ __setup( DRIVER_NAME "=", DRM_OPTIONS_FUNC );
#undef DRM_OPTIONS_FUNC
#endif
#define MAX_DEVICES 4
drm_device_t DRM(device)[MAX_DEVICES];
int DRM(numdevs) = 0;
int DRM(fb_loaded) = 0;
struct file_operations DRM(fops) = {
@ -176,15 +162,6 @@ 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;
@ -453,37 +430,19 @@ static struct pci_device_id DRM(pciidlist)[] = {
DRM(PCI_IDS)
};
static int drm_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
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;
DRM_DEBUG( "\n" );
if (DRM(numdevs) >= MAX_DEVICES)
return -ENODEV;
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 );
dev->maplist = DRM(alloc)(sizeof(*dev->maplist), DRM_MEM_MAPS);
if(dev->maplist == NULL)
return -ENOMEM;
memset(dev->maplist, 0, sizeof(*dev->maplist));
INIT_LIST_HEAD(&dev->maplist->head);
if (DRM(fb_loaded)==0) {
pci_set_drvdata(pdev, dev);
pci_request_regions(pdev, DRIVER_NAME);
pci_enable_device(pdev);
}
dev->name = DRIVER_NAME;
dev->pdev = pdev;
#ifdef __alpha__
dev->hose = pdev->sysdata;
dev->pci_domain = dev->hose->bus->number;
@ -495,6 +454,10 @@ static int drm_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
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);
/* dev_priv_size can be changed by a driver in driver_register_fns */
dev->dev_priv_size = sizeof(u32);
@ -504,14 +467,14 @@ static int drm_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
if (dev->fn_tbl.preinit)
if ((retcode = dev->fn_tbl.preinit(dev, ent->driver_data)))
goto error_out;
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;
goto error_out_unreg;
}
@ -527,18 +490,10 @@ static int drm_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
retcode = DRM(ctxbitmap_init)( dev );
if( retcode ) {
DRM_ERROR( "Cannot allocate memory for context bitmap.\n" );
goto error_out;
goto error_out_unreg;
}
if ((dev->minor = DRM(stub_register)(DRIVER_NAME, &DRM(fops),dev)) < 0)
{
retcode = -EPERM;
goto error_out;
}
dev->device = MKDEV(DRM_MAJOR, dev->minor );
DRM(numdevs)++; /* no errors, mark it reserved */
DRM_INFO( "Initialized %s %d.%d.%d %s on minor %d: %s\n",
DRIVER_NAME,
@ -558,14 +513,7 @@ static int drm_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
return 0;
error_out_unreg:
DRM(stub_unregister)(dev->minor);
DRM(takedown)(dev);
error_out:
if (DRM(fb_loaded)==0) {
pci_set_drvdata(pdev, NULL);
pci_release_regions(pdev);
pci_disable_device(pdev);
}
return retcode;
}
@ -574,17 +522,23 @@ static void __exit drm_cleanup_pci(struct pci_dev *pdev)
drm_device_t *dev = pci_get_drvdata(pdev);
pci_set_drvdata(pdev, NULL);
drm_cleanup(dev);
pci_release_regions(pdev);
if (dev)
drm_cleanup(dev);
}
static struct pci_driver drm_driver = {
.name = DRIVER_NAME,
.id_table = DRM(pciidlist),
.probe = drm_probe,
.probe = DRM(probe),
.remove = __devexit_p(drm_cleanup_pci),
};
#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).
@ -641,7 +595,7 @@ static int __init drm_init( void )
/* pass back in pdev to account for multiple identical cards */
while ((pdev = pci_get_subsys(pid->vendor, pid->device, pid->subvendor, pid->subdevice, pdev))) {
/* stealth mode requires a manual probe */
drm_probe(pdev, &DRM(pciidlist[i]));
DRM(probe)(pdev, &DRM(pciidlist[i]));
}
}
DRM_INFO("Used old pci detect: framebuffer loaded\n");
@ -709,13 +663,6 @@ static void __exit drm_cleanup( drm_device_t *dev )
if (DRM(fb_loaded)==0)
pci_disable_device(dev->pdev);
DRM(numdevs)--;
if ( DRM(stub_unregister)(dev->minor) ) {
DRM_ERROR( "Cannot unload module\n" );
} else {
DRM_DEBUG( "minor %d unregistered\n", dev->minor);
}
DRM(ctxbitmap_cleanup)( dev );
if (drm_core_has_MTRR(dev) && drm_core_has_AGP(dev) && dev->agp && dev->agp->agp_mtrr >= 0) {
@ -733,25 +680,33 @@ static void __exit drm_cleanup( drm_device_t *dev )
}
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(fb_loaded)==1)
{
int i;
drm_device_t *dev;
for (i = DRM(numdevs) - 1; i >= 0; i--) {
dev = &(DRM(device)[i]);
/* release the pci driver */
if (dev->pdev)
pci_dev_put(dev->pdev);
drm_cleanup(dev);
if (DRM(fb_loaded)) {
if (DRM(global)) {
for (i = 0; i < DRM(global)->cards_limit; i++) {
minor = &DRM(global)->minors[i];
dev = minor->dev;
DRM_DEBUG("fb loaded release minor %d\n", dev->minor);
if ((minor->class == DRM_MINOR_PRIMARY) && (dev->fops == &DRM(fops))) {
/* release the pci driver */
if (dev->pdev)
pci_dev_put(dev->pdev);
drm_cleanup(dev);
}
}
}
}
else
} else
pci_unregister_driver(&drm_driver);
DRM_INFO( "Module unloaded\n" );
}
@ -818,18 +773,15 @@ 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 ) {

391
linux-core/drm_stub.c
View File

@ -33,14 +33,18 @@
#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 */
/** 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_AUTHOR( DRIVER_AUTHOR );
MODULE_DESCRIPTION( DRIVER_DESC );
MODULE_LICENSE("GPL and additional rights");
module_param(cards_limit, int, 0444);
MODULE_PARM_DESC(cards_limit, "Maximum number of graphics cards");
module_param(debug, int, 0644);
MODULE_PARM_DESC(debug, "Enable debug output");
drm_global_t *DRM(global);
/**
* File \c open operation.
@ -51,15 +55,24 @@ static struct drm_stub_list {
* Puts the drm_stub_list::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)
{
int minor = iminor(inode);
int err = -ENODEV;
drm_device_t *dev = NULL;
int minor = iminor(inode);
int err = -ENODEV;
struct file_operations *old_fops;
DRM_DEBUG("\n");
if (!DRM(stub_list) || !DRM(stub_list)[minor].fops) return -ENODEV;
old_fops = filp->f_op;
filp->f_op = fops_get(DRM(stub_list)[minor].fops);
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(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);
@ -72,23 +85,24 @@ 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
};
#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,0)
static int drm_hotplug (struct class_device *dev, char **envp, int num_envp,
static int drm_hotplug (struct class_device *cdev, char **envp, int num_envp,
char *buffer, int buffer_size)
{
drm_device_t *dev;
struct pci_dev *pdev;
char *scratch;
int i = 0;
int length = 0;
DRM_DEBUG("\n");
if (!dev)
if (!cdev)
return -ENODEV;
pdev = to_pci_dev(dev->dev);
pdev = to_pci_dev(cdev->dev);
if (!pdev)
return -ENODEV;
@ -127,19 +141,17 @@ static int drm_hotplug (struct class_device *dev, char **envp, int num_envp,
return -ENOMEM;
++length;
scratch += length;
#if 0
drm_device_t *ddev;
ddev = pci_get_drvdata(pdev);
if (ddev) {
dev = pci_get_drvdata(pdev);
if (dev) {
envp[i++] = scratch;
length += snprintf (scratch, buffer_size - length,
"RESET=%s", (ddev->need_reset ? "true" : "false"));
"RESET=%s", (dev->need_reset ? "true" : "false"));
if ((buffer_size - length <= 0) || (i >= num_envp))
return -ENOMEM;
}
#endif
envp[i] = 0;
return 0;
}
#endif
@ -156,33 +168,105 @@ static int drm_hotplug (struct class_device *dev, char **envp, int num_envp,
* 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->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 = NULL, .class = 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, &minors->dev_root))) {
printk (KERN_ERR "DRM: Failed to initialize /proc/dri.\n");
goto err_g1;
}
if (!DRM(fb_loaded)) { /* set this before device_add hotplug uses it */
pci_set_drvdata(pdev, dev);
pci_request_regions(pdev, DRIVER_NAME);
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;
}
DRM_DEBUG("new primary minor assigned %d\n", minor);
return 0;
}
}
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(proc_init)(dev, i, DRM(stub_info).proc_root,
&DRM(stub_list)[i].dev_root);
(*DRM(stub_info).info_count)++;
DRM_DEBUG("info count increased %d\n", *DRM(stub_info).info_count);
return i;
DRM_ERROR("out of minors\n");
return -ENOMEM;
err_g2:
if (!DRM(fb_loaded)) {
pci_set_drvdata(pdev, NULL);
pci_release_regions(pdev);
pci_disable_device(pdev);
}
DRM(proc_cleanup)(minor, DRM(global)->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;
}
int DRM(get_secondary_minor)(drm_device_t *dev, drm_minor_t **sec_minor)
{
drm_minor_t *minors = &DRM(global)->minors[0];
struct class_device *dev_class;
int ret;
int minor;
DRM_DEBUG("\n");
for (minor = 0; minor < DRM(global)->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(global)->proc_root, &minors->dev_root))) {
printk (KERN_ERR "DRM: Failed to initialize /proc/dri.\n");
goto err_g1;
}
dev_class = class_simple_device_add(DRM(global)->drm_class,
MKDEV(DRM_MAJOR, minor), &dev->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;
}
*sec_minor = minors;
DRM_DEBUG("new secondary 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, .class = DRM_MINOR_FREE};
DRM(free)(dev, sizeof(*dev), DRM_MEM_STUB);
return ret;
}
/**
@ -195,31 +279,53 @@ 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_info).proc_root,
DRM(stub_list)[minor].dev_root);
drm_minor_t *minors = &DRM(global)->minors[dev->minor];
int i;
DRM_DEBUG("release primary minor %d\n", dev->minor);
(*DRM(stub_info).info_count)--;
DRM(proc_cleanup)(dev->minor, DRM(global)->proc_root, minors->dev_root);
class_simple_device_remove(MKDEV(DRM_MAJOR, dev->minor));
if ((*DRM(stub_info).info_count) != 0) {
if (DRM(numdevs) == 0) {
DRM_DEBUG("inter_module_put called %d\n", *DRM(stub_info).info_count);
*minors = (drm_minor_t){.dev = NULL, .class = 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].class != DRM_MINOR_FREE) {
DRM_DEBUG("inter_module_put called\n");
inter_module_put("drm");
return 0;
}
} else {
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(stub_info).drm_class);
unregister_chrdev(DRM_MAJOR, "drm");
}
DRM_DEBUG("unregistering inter_module \n");
inter_module_unregister("drm");
remove_proc_entry("dri", NULL);
class_simple_destroy(DRM(global)->drm_class);
cdev_del(&DRM(global)->drm_cdev);
unregister_chrdev_region(MKDEV(DRM_MAJOR, 0), DRM_MAX_MINOR);
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;
}
int DRM(put_secondary_minor)(drm_minor_t *sec_minor)
{
int minor = sec_minor - &DRM(global)->minors[0];
DRM_DEBUG("release secondary minor %d\n", minor);
DRM(proc_cleanup)(minor, DRM(global)->proc_root, sec_minor->dev_root);
class_simple_device_remove(MKDEV(DRM_MAJOR, minor));
*sec_minor = (drm_minor_t){.dev = NULL, .class = DRM_MINOR_FREE};
return 0;
}
@ -237,104 +343,79 @@ static int DRM(stub_putminor)(int minor)
*
* Finally calls stub_info::info_register.
*/
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;
dev_t dev = MKDEV(DRM_MAJOR, 0);
drm_global_t *global;
int ret = -ENOMEM;
DRM_DEBUG("\n");
/* if we are registering a second device we don't need to worry
about inter module get/put and other things as they've been
done already */
if (DRM(numdevs) == 0) {
/* use the inter_module_get to check - as if the same module
registers chrdev twice it succeeds */
i = (struct drm_stub_info *)inter_module_get("drm");
if (i) {
/* Already registered */
DRM(stub_info).info_register = i->info_register;
DRM(stub_info).info_unregister = i->info_unregister;
DRM(stub_info).drm_class = i->drm_class;
DRM(stub_info).info_count = i->info_count;
DRM_DEBUG("already registered %d\n", *i->info_count);
} else if (*DRM(stub_info).info_count == 0) {
/* 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");
ret1 = register_chrdev(DRM_MAJOR, "drm", &DRM(stub_fops));
if (ret1 < 0) {
printk (KERN_ERR "Error registering drm major number.\n");
return ret1;
}
global = DRM(calloc)(1, sizeof(*global), DRM_MEM_STUB);
if(!global)
return -ENOMEM;
DRM(stub_info).drm_class = class_simple_create(THIS_MODULE, "drm");
if (IS_ERR(DRM(stub_info).drm_class)) {
printk (KERN_ERR "Error creating drm class.\n");
unregister_chrdev(DRM_MAJOR, "drm");
return PTR_ERR(DRM(stub_info).drm_class);
}
class_simple_set_hotplug(DRM(stub_info).drm_class, drm_hotplug);
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;
DRM_DEBUG("calling inter_module_register\n");
inter_module_register("drm", THIS_MODULE, &DRM(stub_info));
if (register_chrdev_region(dev, DRM_MAX_MINOR, "drm"))
goto err_p1;
strncpy(global->drm_cdev.kobj.name, "drm", KOBJ_NAME_LEN);
global->drm_cdev.owner = THIS_MODULE;
cdev_init(&global->drm_cdev, &DRM(stub_fops));
if (cdev_add(&global->drm_cdev, dev, DRM_MAX_MINOR)) {
kobject_put(&global->drm_cdev.kobj);
printk (KERN_ERR "DRM: Error registering drm major number.\n");
goto err_p2;
}
DRM(stub_info).proc_root = create_proc_entry("dri", S_IFDIR, NULL);
if (!DRM(stub_info).proc_root) {
DRM_ERROR("Cannot create /proc/dri\n");
inter_module_unregister("drm");
unregister_chrdev(DRM_MAJOR, "drm");
class_simple_destroy(DRM(stub_info).drm_class);
return -1;
}
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_p3;
}
class_simple_set_hotplug(global->drm_class, drm_hotplug);
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_p4;
}
DRM_DEBUG("calling inter_module_register\n");
inter_module_register("drm", THIS_MODULE, global);
}
} else
DRM_DEBUG("already retrieved inter_module information\n");
if (DRM(stub_info).info_register) {
ret2 = DRM(stub_info).info_register(name, fops, dev);
if (ret2 < 0) {
if (DRM(numdevs) == 0 && !i) {
inter_module_unregister("drm");
unregister_chrdev(DRM_MAJOR, "drm");
class_simple_destroy(DRM(stub_info).drm_class);
remove_proc_entry("dri", NULL);
DRM_DEBUG("info_register failed, deregistered everything\n");
}
DRM_DEBUG("info_register failed\n");
return ret2;
}
class_simple_device_add(DRM(stub_info).drm_class,
MKDEV(DRM_MAJOR, ret2), &dev->pdev->dev, "card%d", ret2);
return ret2;
DRM(global) = global;
}
return -1;
if ((ret = get_minor(pdev, ent))) {
if (global)
goto err_p4;
return ret;
}
return 0;
err_p4:
class_simple_destroy(global->drm_class);
err_p3:
cdev_del(&global->drm_cdev);
unregister_chrdev_region(dev, DRM_MAX_MINOR);
err_p2:
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;
}
/**
* Unregister.
*
* \param minor
*
* Calls drm_stub_info::unregister.
*/
int DRM(stub_unregister)(int minor)
{
DRM_DEBUG("%d\n", minor);
class_simple_device_remove(MKDEV(DRM_MAJOR, minor));
if (DRM(stub_info).info_unregister)
return DRM(stub_info).info_unregister(minor);
return -1;
}
int DRM(stub_count);
/** Stub information */
struct drm_stub_info DRM(stub_info) = {
.info_register = DRM(stub_getminor),
.info_unregister = DRM(stub_putminor),
.drm_class = NULL,
.info_count = &DRM(stub_count),
.proc_root = NULL,
};

32
linux/drmP.h
View File

@ -56,6 +56,7 @@
#include <linux/smp_lock.h> /* For (un)lock_kernel */
#include <linux/mm.h>
#include <linux/pagemap.h>
#include <linux/cdev.h>
#if defined(__alpha__) || defined(__powerpc__)
#include <asm/pgtable.h> /* For pte_wrprotect */
#endif
@ -554,7 +555,6 @@ typedef struct drm_device {
int if_version; /**< Highest interface version set */
int blocked; /**< Blocked due to VC switch? */
struct proc_dir_entry *root; /**< Root for this device's entries */
/** \name Locks */
/*@{*/
@ -673,12 +673,33 @@ typedef struct drm_device {
sigset_t sigmask;
int need_reset; /**< secondary device needing reset */
struct file_operations *fops; /**< file operations */
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,
DRM_MINOR_SECONDARY,
} class;
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;
struct cdev drm_cdev;
} drm_global_t;
static __inline__ int drm_core_check_feature(struct drm_device *dev, int feature)
{
return ((dev->driver_features & feature) ? 1 : 0);
@ -904,10 +925,11 @@ 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 int DRM(get_secondary_minor)(drm_device_t *dev, drm_minor_t **sec_minor);
extern int DRM(put_secondary_minor)(drm_minor_t *sec_minor);
extern drm_global_t *DRM(global);
/* Proc support (drm_proc.h) */
extern int DRM(proc_init)(drm_device_t *dev,

140
linux/drm_drv.h
View File

@ -62,17 +62,6 @@
static void __exit drm_cleanup( drm_device_t *dev );
/** Stub information */
struct drm_stub_info {
int (*info_register)(const char *name, struct file_operations *fops,
drm_device_t *dev);
int (*info_unregister)(int minor);
struct class_simple *drm_class;
int *info_count;
struct proc_dir_entry *proc_root;
};
extern struct drm_stub_info DRM(stub_info);
#ifndef MODULE
/** Use an additional macro to avoid preprocessor troubles */
#define DRM_OPTIONS_FUNC DRM(options)
@ -91,9 +80,6 @@ __setup( DRIVER_NAME "=", DRM_OPTIONS_FUNC );
#undef DRM_OPTIONS_FUNC
#endif
#define MAX_DEVICES 4
drm_device_t DRM(device)[MAX_DEVICES];
int DRM(numdevs) = 0;
int DRM(fb_loaded) = 0;
struct file_operations DRM(fops) = {
@ -176,15 +162,6 @@ 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;
@ -453,37 +430,19 @@ static struct pci_device_id DRM(pciidlist)[] = {
DRM(PCI_IDS)
};
static int drm_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
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;
DRM_DEBUG( "\n" );
if (DRM(numdevs) >= MAX_DEVICES)
return -ENODEV;
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 );
dev->maplist = DRM(alloc)(sizeof(*dev->maplist), DRM_MEM_MAPS);
if(dev->maplist == NULL)
return -ENOMEM;
memset(dev->maplist, 0, sizeof(*dev->maplist));
INIT_LIST_HEAD(&dev->maplist->head);
if (DRM(fb_loaded)==0) {
pci_set_drvdata(pdev, dev);
pci_request_regions(pdev, DRIVER_NAME);
pci_enable_device(pdev);
}
dev->name = DRIVER_NAME;
dev->pdev = pdev;
#ifdef __alpha__
dev->hose = pdev->sysdata;
dev->pci_domain = dev->hose->bus->number;
@ -495,6 +454,10 @@ static int drm_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
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);
/* dev_priv_size can be changed by a driver in driver_register_fns */
dev->dev_priv_size = sizeof(u32);
@ -504,14 +467,14 @@ static int drm_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
if (dev->fn_tbl.preinit)
if ((retcode = dev->fn_tbl.preinit(dev, ent->driver_data)))
goto error_out;
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;
goto error_out_unreg;
}
@ -527,18 +490,10 @@ static int drm_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
retcode = DRM(ctxbitmap_init)( dev );
if( retcode ) {
DRM_ERROR( "Cannot allocate memory for context bitmap.\n" );
goto error_out;
goto error_out_unreg;
}
if ((dev->minor = DRM(stub_register)(DRIVER_NAME, &DRM(fops),dev)) < 0)
{
retcode = -EPERM;
goto error_out;
}
dev->device = MKDEV(DRM_MAJOR, dev->minor );
DRM(numdevs)++; /* no errors, mark it reserved */
DRM_INFO( "Initialized %s %d.%d.%d %s on minor %d: %s\n",
DRIVER_NAME,
@ -558,14 +513,7 @@ static int drm_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
return 0;
error_out_unreg:
DRM(stub_unregister)(dev->minor);
DRM(takedown)(dev);
error_out:
if (DRM(fb_loaded)==0) {
pci_set_drvdata(pdev, NULL);
pci_release_regions(pdev);
pci_disable_device(pdev);
}
return retcode;
}
@ -574,17 +522,23 @@ static void __exit drm_cleanup_pci(struct pci_dev *pdev)
drm_device_t *dev = pci_get_drvdata(pdev);
pci_set_drvdata(pdev, NULL);
drm_cleanup(dev);
pci_release_regions(pdev);
if (dev)
drm_cleanup(dev);
}
static struct pci_driver drm_driver = {
.name = DRIVER_NAME,
.id_table = DRM(pciidlist),
.probe = drm_probe,
.probe = DRM(probe),
.remove = __devexit_p(drm_cleanup_pci),
};
#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).
@ -641,7 +595,7 @@ static int __init drm_init( void )
/* pass back in pdev to account for multiple identical cards */
while ((pdev = pci_get_subsys(pid->vendor, pid->device, pid->subvendor, pid->subdevice, pdev))) {
/* stealth mode requires a manual probe */
drm_probe(pdev, &DRM(pciidlist[i]));
DRM(probe)(pdev, &DRM(pciidlist[i]));
}
}
DRM_INFO("Used old pci detect: framebuffer loaded\n");
@ -709,13 +663,6 @@ static void __exit drm_cleanup( drm_device_t *dev )
if (DRM(fb_loaded)==0)
pci_disable_device(dev->pdev);
DRM(numdevs)--;
if ( DRM(stub_unregister)(dev->minor) ) {
DRM_ERROR( "Cannot unload module\n" );
} else {
DRM_DEBUG( "minor %d unregistered\n", dev->minor);
}
DRM(ctxbitmap_cleanup)( dev );
if (drm_core_has_MTRR(dev) && drm_core_has_AGP(dev) && dev->agp && dev->agp->agp_mtrr >= 0) {
@ -733,25 +680,33 @@ static void __exit drm_cleanup( drm_device_t *dev )
}
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(fb_loaded)==1)
{
int i;
drm_device_t *dev;
for (i = DRM(numdevs) - 1; i >= 0; i--) {
dev = &(DRM(device)[i]);
/* release the pci driver */
if (dev->pdev)
pci_dev_put(dev->pdev);
drm_cleanup(dev);
if (DRM(fb_loaded)) {
if (DRM(global)) {
for (i = 0; i < DRM(global)->cards_limit; i++) {
minor = &DRM(global)->minors[i];
dev = minor->dev;
DRM_DEBUG("fb loaded release minor %d\n", dev->minor);
if ((minor->class == DRM_MINOR_PRIMARY) && (dev->fops == &DRM(fops))) {
/* release the pci driver */
if (dev->pdev)
pci_dev_put(dev->pdev);
drm_cleanup(dev);
}
}
}
}
else
} else
pci_unregister_driver(&drm_driver);
DRM_INFO( "Module unloaded\n" );
}
@ -818,18 +773,15 @@ 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 ) {

391
linux/drm_stub.h
View File

@ -33,14 +33,18 @@
#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 */
/** 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_AUTHOR( DRIVER_AUTHOR );
MODULE_DESCRIPTION( DRIVER_DESC );
MODULE_LICENSE("GPL and additional rights");
module_param(cards_limit, int, 0444);
MODULE_PARM_DESC(cards_limit, "Maximum number of graphics cards");
module_param(debug, int, 0644);
MODULE_PARM_DESC(debug, "Enable debug output");
drm_global_t *DRM(global);
/**
* File \c open operation.
@ -51,15 +55,24 @@ static struct drm_stub_list {
* Puts the drm_stub_list::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)
{
int minor = iminor(inode);
int err = -ENODEV;
drm_device_t *dev = NULL;
int minor = iminor(inode);
int err = -ENODEV;
struct file_operations *old_fops;
DRM_DEBUG("\n");
if (!DRM(stub_list) || !DRM(stub_list)[minor].fops) return -ENODEV;
old_fops = filp->f_op;
filp->f_op = fops_get(DRM(stub_list)[minor].fops);
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(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);
@ -72,23 +85,24 @@ 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
};
#if LINUX_VERSION_CODE > KERNEL_VERSION(2,6,0)
static int drm_hotplug (struct class_device *dev, char **envp, int num_envp,
static int drm_hotplug (struct class_device *cdev, char **envp, int num_envp,
char *buffer, int buffer_size)
{
drm_device_t *dev;
struct pci_dev *pdev;
char *scratch;
int i = 0;
int length = 0;
DRM_DEBUG("\n");
if (!dev)
if (!cdev)
return -ENODEV;
pdev = to_pci_dev(dev->dev);
pdev = to_pci_dev(cdev->dev);
if (!pdev)
return -ENODEV;
@ -127,19 +141,17 @@ static int drm_hotplug (struct class_device *dev, char **envp, int num_envp,
return -ENOMEM;
++length;
scratch += length;
#if 0
drm_device_t *ddev;
ddev = pci_get_drvdata(pdev);
if (ddev) {
dev = pci_get_drvdata(pdev);
if (dev) {
envp[i++] = scratch;
length += snprintf (scratch, buffer_size - length,
"RESET=%s", (ddev->need_reset ? "true" : "false"));
"RESET=%s", (dev->need_reset ? "true" : "false"));
if ((buffer_size - length <= 0) || (i >= num_envp))
return -ENOMEM;
}
#endif
envp[i] = 0;
return 0;
}
#endif
@ -156,33 +168,105 @@ static int drm_hotplug (struct class_device *dev, char **envp, int num_envp,
* 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->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 = NULL, .class = 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, &minors->dev_root))) {
printk (KERN_ERR "DRM: Failed to initialize /proc/dri.\n");
goto err_g1;
}
if (!DRM(fb_loaded)) { /* set this before device_add hotplug uses it */
pci_set_drvdata(pdev, dev);
pci_request_regions(pdev, DRIVER_NAME);
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;
}
DRM_DEBUG("new primary minor assigned %d\n", minor);
return 0;
}
}
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(proc_init)(dev, i, DRM(stub_info).proc_root,
&DRM(stub_list)[i].dev_root);
(*DRM(stub_info).info_count)++;
DRM_DEBUG("info count increased %d\n", *DRM(stub_info).info_count);
return i;
DRM_ERROR("out of minors\n");
return -ENOMEM;
err_g2:
if (!DRM(fb_loaded)) {
pci_set_drvdata(pdev, NULL);
pci_release_regions(pdev);
pci_disable_device(pdev);
}
DRM(proc_cleanup)(minor, DRM(global)->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;
}
int DRM(get_secondary_minor)(drm_device_t *dev, drm_minor_t **sec_minor)
{
drm_minor_t *minors = &DRM(global)->minors[0];
struct class_device *dev_class;
int ret;
int minor;
DRM_DEBUG("\n");
for (minor = 0; minor < DRM(global)->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(global)->proc_root, &minors->dev_root))) {
printk (KERN_ERR "DRM: Failed to initialize /proc/dri.\n");
goto err_g1;
}
dev_class = class_simple_device_add(DRM(global)->drm_class,
MKDEV(DRM_MAJOR, minor), &dev->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;
}
*sec_minor = minors;
DRM_DEBUG("new secondary 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, .class = DRM_MINOR_FREE};
DRM(free)(dev, sizeof(*dev), DRM_MEM_STUB);
return ret;
}
/**
@ -195,31 +279,53 @@ 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_info).proc_root,
DRM(stub_list)[minor].dev_root);
drm_minor_t *minors = &DRM(global)->minors[dev->minor];
int i;
DRM_DEBUG("release primary minor %d\n", dev->minor);
(*DRM(stub_info).info_count)--;
DRM(proc_cleanup)(dev->minor, DRM(global)->proc_root, minors->dev_root);
class_simple_device_remove(MKDEV(DRM_MAJOR, dev->minor));
if ((*DRM(stub_info).info_count) != 0) {
if (DRM(numdevs) == 0) {
DRM_DEBUG("inter_module_put called %d\n", *DRM(stub_info).info_count);
*minors = (drm_minor_t){.dev = NULL, .class = 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].class != DRM_MINOR_FREE) {
DRM_DEBUG("inter_module_put called\n");
inter_module_put("drm");
return 0;
}
} else {
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(stub_info).drm_class);
unregister_chrdev(DRM_MAJOR, "drm");
}
DRM_DEBUG("unregistering inter_module \n");
inter_module_unregister("drm");
remove_proc_entry("dri", NULL);
class_simple_destroy(DRM(global)->drm_class);
cdev_del(&DRM(global)->drm_cdev);
unregister_chrdev_region(MKDEV(DRM_MAJOR, 0), DRM_MAX_MINOR);
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;
}
int DRM(put_secondary_minor)(drm_minor_t *sec_minor)
{
int minor = sec_minor - &DRM(global)->minors[0];
DRM_DEBUG("release secondary minor %d\n", minor);
DRM(proc_cleanup)(minor, DRM(global)->proc_root, sec_minor->dev_root);
class_simple_device_remove(MKDEV(DRM_MAJOR, minor));
*sec_minor = (drm_minor_t){.dev = NULL, .class = DRM_MINOR_FREE};
return 0;
}
@ -237,104 +343,79 @@ static int DRM(stub_putminor)(int minor)
*
* Finally calls stub_info::info_register.
*/
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;
dev_t dev = MKDEV(DRM_MAJOR, 0);
drm_global_t *global;
int ret = -ENOMEM;
DRM_DEBUG("\n");
/* if we are registering a second device we don't need to worry
about inter module get/put and other things as they've been
done already */
if (DRM(numdevs) == 0) {
/* use the inter_module_get to check - as if the same module
registers chrdev twice it succeeds */
i = (struct drm_stub_info *)inter_module_get("drm");
if (i) {
/* Already registered */
DRM(stub_info).info_register = i->info_register;
DRM(stub_info).info_unregister = i->info_unregister;
DRM(stub_info).drm_class = i->drm_class;
DRM(stub_info).info_count = i->info_count;
DRM_DEBUG("already registered %d\n", *i->info_count);
} else if (*DRM(stub_info).info_count == 0) {
/* 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");
ret1 = register_chrdev(DRM_MAJOR, "drm", &DRM(stub_fops));
if (ret1 < 0) {
printk (KERN_ERR "Error registering drm major number.\n");
return ret1;
}
global = DRM(calloc)(1, sizeof(*global), DRM_MEM_STUB);
if(!global)
return -ENOMEM;
DRM(stub_info).drm_class = class_simple_create(THIS_MODULE, "drm");
if (IS_ERR(DRM(stub_info).drm_class)) {
printk (KERN_ERR "Error creating drm class.\n");
unregister_chrdev(DRM_MAJOR, "drm");
return PTR_ERR(DRM(stub_info).drm_class);
}
class_simple_set_hotplug(DRM(stub_info).drm_class, drm_hotplug);
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;
DRM_DEBUG("calling inter_module_register\n");
inter_module_register("drm", THIS_MODULE, &DRM(stub_info));
if (register_chrdev_region(dev, DRM_MAX_MINOR, "drm"))
goto err_p1;
strncpy(global->drm_cdev.kobj.name, "drm", KOBJ_NAME_LEN);
global->drm_cdev.owner = THIS_MODULE;
cdev_init(&global->drm_cdev, &DRM(stub_fops));
if (cdev_add(&global->drm_cdev, dev, DRM_MAX_MINOR)) {
kobject_put(&global->drm_cdev.kobj);
printk (KERN_ERR "DRM: Error registering drm major number.\n");
goto err_p2;
}
DRM(stub_info).proc_root = create_proc_entry("dri", S_IFDIR, NULL);
if (!DRM(stub_info).proc_root) {
DRM_ERROR("Cannot create /proc/dri\n");
inter_module_unregister("drm");
unregister_chrdev(DRM_MAJOR, "drm");
class_simple_destroy(DRM(stub_info).drm_class);
return -1;
}
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_p3;
}
class_simple_set_hotplug(global->drm_class, drm_hotplug);
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_p4;
}
DRM_DEBUG("calling inter_module_register\n");
inter_module_register("drm", THIS_MODULE, global);
}
} else
DRM_DEBUG("already retrieved inter_module information\n");
if (DRM(stub_info).info_register) {
ret2 = DRM(stub_info).info_register(name, fops, dev);
if (ret2 < 0) {
if (DRM(numdevs) == 0 && !i) {
inter_module_unregister("drm");
unregister_chrdev(DRM_MAJOR, "drm");
class_simple_destroy(DRM(stub_info).drm_class);
remove_proc_entry("dri", NULL);
DRM_DEBUG("info_register failed, deregistered everything\n");
}
DRM_DEBUG("info_register failed\n");
return ret2;
}
class_simple_device_add(DRM(stub_info).drm_class,
MKDEV(DRM_MAJOR, ret2), &dev->pdev->dev, "card%d", ret2);
return ret2;
DRM(global) = global;
}
return -1;
if ((ret = get_minor(pdev, ent))) {
if (global)
goto err_p4;
return ret;
}
return 0;
err_p4:
class_simple_destroy(global->drm_class);
err_p3:
cdev_del(&global->drm_cdev);
unregister_chrdev_region(dev, DRM_MAX_MINOR);
err_p2:
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;
}
/**
* Unregister.
*
* \param minor
*
* Calls drm_stub_info::unregister.
*/
int DRM(stub_unregister)(int minor)
{
DRM_DEBUG("%d\n", minor);
class_simple_device_remove(MKDEV(DRM_MAJOR, minor));
if (DRM(stub_info).info_unregister)
return DRM(stub_info).info_unregister(minor);
return -1;
}
int DRM(stub_count);
/** Stub information */
struct drm_stub_info DRM(stub_info) = {
.info_register = DRM(stub_getminor),
.info_unregister = DRM(stub_putminor),
.drm_class = NULL,
.info_count = &DRM(stub_count),
.proc_root = NULL,
};

2
shared-core/drm.h
View File

@ -112,7 +112,7 @@
#if defined(__linux__) || defined(__NetBSD__)
#define DRM_MAJOR 226
#endif
#define DRM_MAX_MINOR 15
#define DRM_MAX_MINOR 255
#endif
#define DRM_NAME "drm" /**< Name in kernel, /dev, and /proc */
#define DRM_MIN_ORDER 5 /**< At least 2^5 bytes = 32 bytes */

2
shared/drm.h
View File

@ -112,7 +112,7 @@
#if defined(__linux__) || defined(__NetBSD__)
#define DRM_MAJOR 226
#endif
#define DRM_MAX_MINOR 15
#define DRM_MAX_MINOR 255
#endif
#define DRM_NAME "drm" /**< Name in kernel, /dev, and /proc */
#define DRM_MIN_ORDER 5 /**< At least 2^5 bytes = 32 bytes */