drivers/char/drm/drm_proc.c - kernel/msm-4.19 - Gitiles

 /**
  * \file drm_proc.c
  * /proc support for DRM
  *
  * \author Rickard E. (Rik) Faith <faith@valinux.com>
  * \author Gareth Hughes <gareth@valinux.com>
  *
  * \par Acknowledgements:
  *    Matthew J Sottek <matthew.j.sottek@intel.com> sent in a patch to fix
  *    the problem with the proc files not outputting all their information.
  */

 /*
  * Created: Mon Jan 11 09:48:47 1999 by faith@valinux.com
  *
  * Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
  * Copyright 2000 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
  * VA LINUX SYSTEMS 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 "drmP.h"

 static int drm_name_info(char *buf, char **start, off_t offset,
 			 int request, int *eof, void *data);
 static int drm_vm_info(char *buf, char **start, off_t offset,
 		       int request, int *eof, void *data);
 static int drm_clients_info(char *buf, char **start, off_t offset,
 			    int request, int *eof, void *data);
 static int drm_queues_info(char *buf, char **start, off_t offset,
 			   int request, int *eof, void *data);
 static int drm_bufs_info(char *buf, char **start, off_t offset,
 			 int request, int *eof, void *data);
 #if DRM_DEBUG_CODE
 static int drm_vma_info(char *buf, char **start, off_t offset,
 			int request, int *eof, void *data);
 #endif

 /**
  * Proc file list.
  */
 static struct drm_proc_list {
 	const char *name;	/**< file name */
 	int (*f) (char *, char **, off_t, int, int *, void *);		/**< proc callback*/
 } drm_proc_list[] = {
 	{"name", drm_name_info},
 	{"mem", drm_mem_info},
 	{"vm", drm_vm_info},
 	{"clients", drm_clients_info},
 	{"queues", drm_queues_info},
 	{"bufs", drm_bufs_info},
 #if DRM_DEBUG_CODE
 	{"vma", drm_vma_info},
 #endif
 };

 #define DRM_PROC_ENTRIES ARRAY_SIZE(drm_proc_list)

 /**
  * Initialize the DRI proc filesystem for a device.
  *
  * \param dev DRM device.
  * \param minor device minor number.
  * \param root DRI proc dir entry.
  * \param dev_root resulting DRI device proc dir entry.
  * \return root entry pointer on success, or NULL on failure.
  *
  * Create the DRI proc root entry "/proc/dri", the device proc root entry
  * "/proc/dri/%minor%/", and each entry in proc_list as
  * "/proc/dri/%minor%/%name%".
  */
 int drm_proc_init(drm_device_t * dev, int minor,
 		  struct proc_dir_entry *root, struct proc_dir_entry **dev_root)
 {
 	struct proc_dir_entry *ent;
 	int i, j;
 	char name[64];

 	sprintf(name, "%d", minor);
 	*dev_root = proc_mkdir(name, root);
 	if (!*dev_root) {
 		DRM_ERROR("Cannot create /proc/dri/%s\n", name);
 		return -1;
 	}

 	for (i = 0; i < DRM_PROC_ENTRIES; i++) {
 		ent = create_proc_entry(drm_proc_list[i].name,
 					S_IFREG | S_IRUGO, *dev_root);
 		if (!ent) {
 			DRM_ERROR("Cannot create /proc/dri/%s/%s\n",
 				  name, drm_proc_list[i].name);
 			for (j = 0; j < i; j++)
 				remove_proc_entry(drm_proc_list[i].name,
 						  *dev_root);
 			remove_proc_entry(name, root);
 			return -1;
 		}
 		ent->read_proc = drm_proc_list[i].f;
 		ent->data = dev;
 	}

 	return 0;
 }

 /**
  * Cleanup the proc filesystem resources.
  *
  * \param minor device minor number.
  * \param root DRI proc dir entry.
  * \param dev_root DRI device proc dir entry.
  * \return always zero.
  *
  * Remove all proc entries created by proc_init().
  */
 int drm_proc_cleanup(int minor, struct proc_dir_entry *root,
 		     struct proc_dir_entry *dev_root)
 {
 	int i;
 	char name[64];

 	if (!root || !dev_root)
 		return 0;

 	for (i = 0; i < DRM_PROC_ENTRIES; i++)
 		remove_proc_entry(drm_proc_list[i].name, dev_root);
 	sprintf(name, "%d", minor);
 	remove_proc_entry(name, root);

 	return 0;
 }

 /**
  * Called when "/proc/dri/.../name" is read.
  *
  * \param buf output buffer.
  * \param start start of output data.
  * \param offset requested start offset.
  * \param request requested number of bytes.
  * \param eof whether there is no more data to return.
  * \param data private data.
  * \return number of written bytes.
  *
  * Prints the device name together with the bus id if available.
  */
 static int drm_name_info(char *buf, char **start, off_t offset, int request,
 			 int *eof, void *data)
 {
 	drm_device_t *dev = (drm_device_t *) data;
 	int len = 0;

 	if (offset > DRM_PROC_LIMIT) {
 		*eof = 1;
 		return 0;
 	}

 	*start = &buf[offset];
 	*eof = 0;

 	if (dev->unique) {
 		DRM_PROC_PRINT("%s %s %s\n",
 			       dev->driver->pci_driver.name,
 			       pci_name(dev->pdev), dev->unique);
 	} else {
 		DRM_PROC_PRINT("%s %s\n", dev->driver->pci_driver.name,
 			       pci_name(dev->pdev));
 	}

 	if (len > request + offset)
 		return request;
 	*eof = 1;
 	return len - offset;
 }

 /**
  * Called when "/proc/dri/.../vm" is read.
  *
  * \param buf output buffer.
  * \param start start of output data.
  * \param offset requested start offset.
  * \param request requested number of bytes.
  * \param eof whether there is no more data to return.
  * \param data private data.
  * \return number of written bytes.
  *
  * Prints information about all mappings in drm_device::maplist.
  */
 static int drm__vm_info(char *buf, char **start, off_t offset, int request,
 			int *eof, void *data)
 {
 	drm_device_t *dev = (drm_device_t *) data;
 	int len = 0;
 	drm_map_t *map;
 	drm_map_list_t *r_list;
 	struct list_head *list;

 	/* Hardcoded from _DRM_FRAME_BUFFER,
 	   _DRM_REGISTERS, _DRM_SHM, _DRM_AGP, and
 	   _DRM_SCATTER_GATHER and _DRM_CONSISTENT */
 	const char *types[] = { "FB", "REG", "SHM", "AGP", "SG", "PCI" };
 	const char *type;
 	int i;

 	if (offset > DRM_PROC_LIMIT) {
 		*eof = 1;
 		return 0;
 	}

 	*start = &buf[offset];
 	*eof = 0;

 	DRM_PROC_PRINT("slot	 offset	      size type flags	 "
 		       "address mtrr\n\n");
 	i = 0;
 	if (dev->maplist != NULL)
 		list_for_each(list, &dev->maplist->head) {
 		r_list = list_entry(list, drm_map_list_t, head);
 		map = r_list->map;
 		if (!map)
 			continue;
 		if (map->type < 0 || map->type > 5)
 			type = "??";
 		else
 			type = types[map->type];
 		DRM_PROC_PRINT("%4d 0x%08lx 0x%08lx %4.4s  0x%02x 0x%08x ",
 			       i,
 			       map->offset,
 			       map->size, type, map->flags, r_list->user_token);
 		if (map->mtrr < 0) {
 			DRM_PROC_PRINT("none\n");
 		} else {
 			DRM_PROC_PRINT("%4d\n", map->mtrr);
 		}
 		i++;
 		}

 	if (len > request + offset)
 		return request;
 	*eof = 1;
 	return len - offset;
 }

 /**
  * Simply calls _vm_info() while holding the drm_device::struct_mutex lock.
  */
 static int drm_vm_info(char *buf, char **start, off_t offset, int request,
 		       int *eof, void *data)
 {
 	drm_device_t *dev = (drm_device_t *) data;
 	int ret;

 	mutex_lock(&dev->struct_mutex);
 	ret = drm__vm_info(buf, start, offset, request, eof, data);
 	mutex_unlock(&dev->struct_mutex);
 	return ret;
 }

 /**
  * Called when "/proc/dri/.../queues" is read.
  *
  * \param buf output buffer.
  * \param start start of output data.
  * \param offset requested start offset.
  * \param request requested number of bytes.
  * \param eof whether there is no more data to return.
  * \param data private data.
  * \return number of written bytes.
  */
 static int drm__queues_info(char *buf, char **start, off_t offset,
 			    int request, int *eof, void *data)
 {
 	drm_device_t *dev = (drm_device_t *) data;
 	int len = 0;
 	int i;
 	drm_queue_t *q;

 	if (offset > DRM_PROC_LIMIT) {
 		*eof = 1;
 		return 0;
 	}

 	*start = &buf[offset];
 	*eof = 0;

 	DRM_PROC_PRINT("  ctx/flags   use   fin"
 		       "   blk/rw/rwf  wait    flushed	   queued"
 		       "      locks\n\n");
 	for (i = 0; i < dev->queue_count; i++) {
 		q = dev->queuelist[i];
 		atomic_inc(&q->use_count);
 		DRM_PROC_PRINT_RET(atomic_dec(&q->use_count),
 				   "%5d/0x%03x %5d %5d"
 				   " %5d/%c%c/%c%c%c %5Zd\n",
 				   i,
 				   q->flags,
 				   atomic_read(&q->use_count),
 				   atomic_read(&q->finalization),
 				   atomic_read(&q->block_count),
 				   atomic_read(&q->block_read) ? 'r' : '-',
 				   atomic_read(&q->block_write) ? 'w' : '-',
 				   waitqueue_active(&q->read_queue) ? 'r' : '-',
 				   waitqueue_active(&q->
 						    write_queue) ? 'w' : '-',
 				   waitqueue_active(&q->
 						    flush_queue) ? 'f' : '-',
 				   DRM_BUFCOUNT(&q->waitlist));
 		atomic_dec(&q->use_count);
 	}

 	if (len > request + offset)
 		return request;
 	*eof = 1;
 	return len - offset;
 }

 /**
  * Simply calls _queues_info() while holding the drm_device::struct_mutex lock.
  */
 static int drm_queues_info(char *buf, char **start, off_t offset, int request,
 			   int *eof, void *data)
 {
 	drm_device_t *dev = (drm_device_t *) data;
 	int ret;

 	mutex_lock(&dev->struct_mutex);
 	ret = drm__queues_info(buf, start, offset, request, eof, data);
 	mutex_unlock(&dev->struct_mutex);
 	return ret;
 }

 /**
  * Called when "/proc/dri/.../bufs" is read.
  *
  * \param buf output buffer.
  * \param start start of output data.
  * \param offset requested start offset.
  * \param request requested number of bytes.
  * \param eof whether there is no more data to return.
  * \param data private data.
  * \return number of written bytes.
  */
 static int drm__bufs_info(char *buf, char **start, off_t offset, int request,
 			  int *eof, void *data)
 {
 	drm_device_t *dev = (drm_device_t *) data;
 	int len = 0;
 	drm_device_dma_t *dma = dev->dma;
 	int i;

 	if (!dma || offset > DRM_PROC_LIMIT) {
 		*eof = 1;
 		return 0;
 	}

 	*start = &buf[offset];
 	*eof = 0;

 	DRM_PROC_PRINT(" o     size count  free	 segs pages    kB\n\n");
 	for (i = 0; i <= DRM_MAX_ORDER; i++) {
 		if (dma->bufs[i].buf_count)
 			DRM_PROC_PRINT("%2d %8d %5d %5d %5d %5d %5ld\n",
 				       i,
 				       dma->bufs[i].buf_size,
 				       dma->bufs[i].buf_count,
 				       atomic_read(&dma->bufs[i]
 						   .freelist.count),
 				       dma->bufs[i].seg_count,
 				       dma->bufs[i].seg_count
 				       * (1 << dma->bufs[i].page_order),
 				       (dma->bufs[i].seg_count
 					* (1 << dma->bufs[i].page_order))
 				       * PAGE_SIZE / 1024);
 	}
 	DRM_PROC_PRINT("\n");
 	for (i = 0; i < dma->buf_count; i++) {
 		if (i && !(i % 32))
 			DRM_PROC_PRINT("\n");
 		DRM_PROC_PRINT(" %d", dma->buflist[i]->list);
 	}
 	DRM_PROC_PRINT("\n");

 	if (len > request + offset)
 		return request;
 	*eof = 1;
 	return len - offset;
 }

 /**
  * Simply calls _bufs_info() while holding the drm_device::struct_mutex lock.
  */
 static int drm_bufs_info(char *buf, char **start, off_t offset, int request,
 			 int *eof, void *data)
 {
 	drm_device_t *dev = (drm_device_t *) data;
 	int ret;

 	mutex_lock(&dev->struct_mutex);
 	ret = drm__bufs_info(buf, start, offset, request, eof, data);
 	mutex_unlock(&dev->struct_mutex);
 	return ret;
 }

 /**
  * Called when "/proc/dri/.../clients" is read.
  *
  * \param buf output buffer.
  * \param start start of output data.
  * \param offset requested start offset.
  * \param request requested number of bytes.
  * \param eof whether there is no more data to return.
  * \param data private data.
  * \return number of written bytes.
  */
 static int drm__clients_info(char *buf, char **start, off_t offset,
 			     int request, int *eof, void *data)
 {
 	drm_device_t *dev = (drm_device_t *) data;
 	int len = 0;
 	drm_file_t *priv;

 	if (offset > DRM_PROC_LIMIT) {
 		*eof = 1;
 		return 0;
 	}

 	*start = &buf[offset];
 	*eof = 0;

 	DRM_PROC_PRINT("a dev	pid    uid	magic	  ioctls\n\n");
 	for (priv = dev->file_first; priv; priv = priv->next) {
 		DRM_PROC_PRINT("%c %3d %5d %5d %10u %10lu\n",
 			       priv->authenticated ? 'y' : 'n',
 			       priv->minor,
 			       priv->pid,
 			       priv->uid, priv->magic, priv->ioctl_count);
 	}

 	if (len > request + offset)
 		return request;
 	*eof = 1;
 	return len - offset;
 }

 /**
  * Simply calls _clients_info() while holding the drm_device::struct_mutex lock.
  */
 static int drm_clients_info(char *buf, char **start, off_t offset,
 			    int request, int *eof, void *data)
 {
 	drm_device_t *dev = (drm_device_t *) data;
 	int ret;

 	mutex_lock(&dev->struct_mutex);
 	ret = drm__clients_info(buf, start, offset, request, eof, data);
 	mutex_unlock(&dev->struct_mutex);
 	return ret;
 }

 #if DRM_DEBUG_CODE

 static int drm__vma_info(char *buf, char **start, off_t offset, int request,
 			 int *eof, void *data)
 {
 	drm_device_t *dev = (drm_device_t *) data;
 	int len = 0;
 	drm_vma_entry_t *pt;
 	struct vm_area_struct *vma;
 #if defined(__i386__)
 	unsigned int pgprot;
 #endif

 	if (offset > DRM_PROC_LIMIT) {
 		*eof = 1;
 		return 0;
 	}

 	*start = &buf[offset];
 	*eof = 0;

 	DRM_PROC_PRINT("vma use count: %d, high_memory = %p, 0x%08lx\n",
 		       atomic_read(&dev->vma_count),
 		       high_memory, virt_to_phys(high_memory));
 	for (pt = dev->vmalist; pt; pt = pt->next) {
 		if (!(vma = pt->vma))
 			continue;
 		DRM_PROC_PRINT("\n%5d 0x%08lx-0x%08lx %c%c%c%c%c%c 0x%08lx000",
 			       pt->pid,
 			       vma->vm_start,
 			       vma->vm_end,
 			       vma->vm_flags & VM_READ ? 'r' : '-',
 			       vma->vm_flags & VM_WRITE ? 'w' : '-',
 			       vma->vm_flags & VM_EXEC ? 'x' : '-',
 			       vma->vm_flags & VM_MAYSHARE ? 's' : 'p',
 			       vma->vm_flags & VM_LOCKED ? 'l' : '-',
 			       vma->vm_flags & VM_IO ? 'i' : '-',
 			       vma->vm_pgoff);

 #if defined(__i386__)
 		pgprot = pgprot_val(vma->vm_page_prot);
 		DRM_PROC_PRINT(" %c%c%c%c%c%c%c%c%c",
 			       pgprot & _PAGE_PRESENT ? 'p' : '-',
 			       pgprot & _PAGE_RW ? 'w' : 'r',
 			       pgprot & _PAGE_USER ? 'u' : 's',
 			       pgprot & _PAGE_PWT ? 't' : 'b',
 			       pgprot & _PAGE_PCD ? 'u' : 'c',
 			       pgprot & _PAGE_ACCESSED ? 'a' : '-',
 			       pgprot & _PAGE_DIRTY ? 'd' : '-',
 			       pgprot & _PAGE_PSE ? 'm' : 'k',
 			       pgprot & _PAGE_GLOBAL ? 'g' : 'l');
 #endif
 		DRM_PROC_PRINT("\n");
 	}

 	if (len > request + offset)
 		return request;
 	*eof = 1;
 	return len - offset;
 }

 static int drm_vma_info(char *buf, char **start, off_t offset, int request,
 			int *eof, void *data)
 {
 	drm_device_t *dev = (drm_device_t *) data;
 	int ret;

 	mutex_lock(&dev->struct_mutex);
 	ret = drm__vma_info(buf, start, offset, request, eof, data);
 	mutex_unlock(&dev->struct_mutex);
 	return ret;
 }
 #endif
	/**
	* \file drm_proc.c
	* /proc support for DRM
	*
	* \author Rickard E. (Rik) Faith <faith@valinux.com>
	* \author Gareth Hughes <gareth@valinux.com>
	*
	* \par Acknowledgements:
	* Matthew J Sottek <matthew.j.sottek@intel.com> sent in a patch to fix
	* the problem with the proc files not outputting all their information.
	*/

	/*
	* Created: Mon Jan 11 09:48:47 1999 by faith@valinux.com
	*
	* Copyright 1999 Precision Insight, Inc., Cedar Park, Texas.
	* Copyright 2000 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
	* VA LINUX SYSTEMS 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 "drmP.h"

	static int drm_name_info(char buf, char *start, off_t offset,
	int request, int eof, void data);
	static int drm_vm_info(char buf, char *start, off_t offset,
	int request, int eof, void data);
	static int drm_clients_info(char buf, char *start, off_t offset,
	int request, int eof, void data);
	static int drm_queues_info(char buf, char *start, off_t offset,
	int request, int eof, void data);
	static int drm_bufs_info(char buf, char *start, off_t offset,
	int request, int eof, void data);
	#if DRM_DEBUG_CODE
	static int drm_vma_info(char buf, char *start, off_t offset,
	int request, int eof, void data);
	#endif

	/**
	* Proc file list.
	*/
	static struct drm_proc_list {
	const char name; /< file name /
	int (f) (char , char *, off_t, int, int , void ); /< proc callback/
	} drm_proc_list[] = {
	{"name", drm_name_info},
	{"mem", drm_mem_info},
	{"vm", drm_vm_info},
	{"clients", drm_clients_info},
	{"queues", drm_queues_info},
	{"bufs", drm_bufs_info},
	#if DRM_DEBUG_CODE
	{"vma", drm_vma_info},
	#endif
	};

	#define DRM_PROC_ENTRIES ARRAY_SIZE(drm_proc_list)

	/**
	* Initialize the DRI proc filesystem for a device.
	*
	* \param dev DRM device.
	* \param minor device minor number.
	* \param root DRI proc dir entry.
	* \param dev_root resulting DRI device proc dir entry.
	* \return root entry pointer on success, or NULL on failure.
	*
	* Create the DRI proc root entry "/proc/dri", the device proc root entry
	* "/proc/dri/%minor%/", and each entry in proc_list as
	* "/proc/dri/%minor%/%name%".
	*/
	int drm_proc_init(drm_device_t * dev, int minor,
	struct proc_dir_entry root, struct proc_dir_entry *dev_root)
	{
	struct proc_dir_entry *ent;
	int i, j;
	char name[64];

	sprintf(name, "%d", minor);
	*dev_root = proc_mkdir(name, root);
	if (!*dev_root) {
	DRM_ERROR("Cannot create /proc/dri/%s\n", name);
	return -1;
	}

	for (i = 0; i < DRM_PROC_ENTRIES; i++) {
	ent = create_proc_entry(drm_proc_list[i].name,
	S_IFREG \| S_IRUGO, *dev_root);
	if (!ent) {
	DRM_ERROR("Cannot create /proc/dri/%s/%s\n",
	name, drm_proc_list[i].name);
	for (j = 0; j < i; j++)
	remove_proc_entry(drm_proc_list[i].name,
	*dev_root);
	remove_proc_entry(name, root);
	return -1;
	}
	ent->read_proc = drm_proc_list[i].f;
	ent->data = dev;
	}

	return 0;
	}

	/**
	* Cleanup the proc filesystem resources.
	*
	* \param minor device minor number.
	* \param root DRI proc dir entry.
	* \param dev_root DRI device proc dir entry.
	* \return always zero.
	*
	* Remove all proc entries created by proc_init().
	*/
	int drm_proc_cleanup(int minor, struct proc_dir_entry *root,
	struct proc_dir_entry *dev_root)
	{
	int i;
	char name[64];

	if (!root \|\| !dev_root)
	return 0;

	for (i = 0; i < DRM_PROC_ENTRIES; i++)
	remove_proc_entry(drm_proc_list[i].name, dev_root);
	sprintf(name, "%d", minor);
	remove_proc_entry(name, root);

	return 0;
	}

	/**
	* Called when "/proc/dri/.../name" is read.
	*
	* \param buf output buffer.
	* \param start start of output data.
	* \param offset requested start offset.
	* \param request requested number of bytes.
	* \param eof whether there is no more data to return.
	* \param data private data.
	* \return number of written bytes.
	*
	* Prints the device name together with the bus id if available.
	*/
	static int drm_name_info(char buf, char *start, off_t offset, int request,
	int eof, void data)
	{
	drm_device_t dev = (drm_device_t ) data;
	int len = 0;

	if (offset > DRM_PROC_LIMIT) {
	*eof = 1;
	return 0;
	}

	*start = &buf[offset];
	*eof = 0;

	if (dev->unique) {
	DRM_PROC_PRINT("%s %s %s\n",
	dev->driver->pci_driver.name,
	pci_name(dev->pdev), dev->unique);
	} else {
	DRM_PROC_PRINT("%s %s\n", dev->driver->pci_driver.name,
	pci_name(dev->pdev));
	}

	if (len > request + offset)
	return request;
	*eof = 1;
	return len - offset;
	}

	/**
	* Called when "/proc/dri/.../vm" is read.
	*
	* \param buf output buffer.
	* \param start start of output data.
	* \param offset requested start offset.
	* \param request requested number of bytes.
	* \param eof whether there is no more data to return.
	* \param data private data.
	* \return number of written bytes.
	*
	* Prints information about all mappings in drm_device::maplist.
	*/
	static int drm__vm_info(char buf, char *start, off_t offset, int request,
	int eof, void data)
	{
	drm_device_t dev = (drm_device_t ) data;
	int len = 0;
	drm_map_t *map;
	drm_map_list_t *r_list;
	struct list_head *list;

	/* Hardcoded from _DRM_FRAME_BUFFER,
	_DRM_REGISTERS, _DRM_SHM, _DRM_AGP, and
	_DRM_SCATTER_GATHER and _DRM_CONSISTENT */
	const char *types[] = { "FB", "REG", "SHM", "AGP", "SG", "PCI" };
	const char *type;
	int i;

	if (offset > DRM_PROC_LIMIT) {
	*eof = 1;
	return 0;
	}

	*start = &buf[offset];
	*eof = 0;

	DRM_PROC_PRINT("slot offset size type flags "
	"address mtrr\n\n");
	i = 0;
	if (dev->maplist != NULL)
	list_for_each(list, &dev->maplist->head) {
	r_list = list_entry(list, drm_map_list_t, head);
	map = r_list->map;
	if (!map)
	continue;
	if (map->type < 0 \|\| map->type > 5)
	type = "??";
	else
	type = types[map->type];
	DRM_PROC_PRINT("%4d 0x%08lx 0x%08lx %4.4s 0x%02x 0x%08x ",
	i,
	map->offset,
	map->size, type, map->flags, r_list->user_token);
	if (map->mtrr < 0) {
	DRM_PROC_PRINT("none\n");
	} else {
	DRM_PROC_PRINT("%4d\n", map->mtrr);
	}
	i++;
	}

	if (len > request + offset)
	return request;
	*eof = 1;
	return len - offset;
	}

	/**
	* Simply calls _vm_info() while holding the drm_device::struct_mutex lock.
	*/
	static int drm_vm_info(char buf, char *start, off_t offset, int request,
	int eof, void data)
	{
	drm_device_t dev = (drm_device_t ) data;
	int ret;

	mutex_lock(&dev->struct_mutex);
	ret = drm__vm_info(buf, start, offset, request, eof, data);
	mutex_unlock(&dev->struct_mutex);
	return ret;
	}

	/**
	* Called when "/proc/dri/.../queues" is read.
	*
	* \param buf output buffer.
	* \param start start of output data.
	* \param offset requested start offset.
	* \param request requested number of bytes.
	* \param eof whether there is no more data to return.
	* \param data private data.
	* \return number of written bytes.
	*/
	static int drm__queues_info(char buf, char *start, off_t offset,
	int request, int eof, void data)
	{
	drm_device_t dev = (drm_device_t ) data;
	int len = 0;
	int i;
	drm_queue_t *q;

	if (offset > DRM_PROC_LIMIT) {
	*eof = 1;
	return 0;
	}

	*start = &buf[offset];
	*eof = 0;

	DRM_PROC_PRINT(" ctx/flags use fin"
	" blk/rw/rwf wait flushed queued"
	" locks\n\n");
	for (i = 0; i < dev->queue_count; i++) {
	q = dev->queuelist[i];
	atomic_inc(&q->use_count);
	DRM_PROC_PRINT_RET(atomic_dec(&q->use_count),
	"%5d/0x%03x %5d %5d"
	" %5d/%c%c/%c%c%c %5Zd\n",
	i,
	q->flags,
	atomic_read(&q->use_count),
	atomic_read(&q->finalization),
	atomic_read(&q->block_count),
	atomic_read(&q->block_read) ? 'r' : '-',
	atomic_read(&q->block_write) ? 'w' : '-',
	waitqueue_active(&q->read_queue) ? 'r' : '-',
	waitqueue_active(&q->
	write_queue) ? 'w' : '-',
	waitqueue_active(&q->
	flush_queue) ? 'f' : '-',
	DRM_BUFCOUNT(&q->waitlist));
	atomic_dec(&q->use_count);
	}

	if (len > request + offset)
	return request;
	*eof = 1;
	return len - offset;
	}

	/**
	* Simply calls _queues_info() while holding the drm_device::struct_mutex lock.
	*/
	static int drm_queues_info(char buf, char *start, off_t offset, int request,
	int eof, void data)
	{
	drm_device_t dev = (drm_device_t ) data;
	int ret;

	mutex_lock(&dev->struct_mutex);
	ret = drm__queues_info(buf, start, offset, request, eof, data);
	mutex_unlock(&dev->struct_mutex);
	return ret;
	}

	/**
	* Called when "/proc/dri/.../bufs" is read.
	*
	* \param buf output buffer.
	* \param start start of output data.
	* \param offset requested start offset.
	* \param request requested number of bytes.
	* \param eof whether there is no more data to return.
	* \param data private data.
	* \return number of written bytes.
	*/
	static int drm__bufs_info(char buf, char *start, off_t offset, int request,
	int eof, void data)
	{
	drm_device_t dev = (drm_device_t ) data;
	int len = 0;
	drm_device_dma_t *dma = dev->dma;
	int i;

	if (!dma \|\| offset > DRM_PROC_LIMIT) {
	*eof = 1;
	return 0;
	}

	*start = &buf[offset];
	*eof = 0;

	DRM_PROC_PRINT(" o size count free segs pages kB\n\n");
	for (i = 0; i <= DRM_MAX_ORDER; i++) {
	if (dma->bufs[i].buf_count)
	DRM_PROC_PRINT("%2d %8d %5d %5d %5d %5d %5ld\n",
	i,
	dma->bufs[i].buf_size,
	dma->bufs[i].buf_count,
	atomic_read(&dma->bufs[i]
	.freelist.count),
	dma->bufs[i].seg_count,
	dma->bufs[i].seg_count
	* (1 << dma->bufs[i].page_order),
	(dma->bufs[i].seg_count
	* (1 << dma->bufs[i].page_order))
	* PAGE_SIZE / 1024);
	}
	DRM_PROC_PRINT("\n");
	for (i = 0; i < dma->buf_count; i++) {
	if (i && !(i % 32))
	DRM_PROC_PRINT("\n");
	DRM_PROC_PRINT(" %d", dma->buflist[i]->list);
	}
	DRM_PROC_PRINT("\n");

	if (len > request + offset)
	return request;
	*eof = 1;
	return len - offset;
	}

	/**
	* Simply calls _bufs_info() while holding the drm_device::struct_mutex lock.
	*/
	static int drm_bufs_info(char buf, char *start, off_t offset, int request,
	int eof, void data)
	{
	drm_device_t dev = (drm_device_t ) data;
	int ret;

	mutex_lock(&dev->struct_mutex);
	ret = drm__bufs_info(buf, start, offset, request, eof, data);
	mutex_unlock(&dev->struct_mutex);
	return ret;
	}

	/**
	* Called when "/proc/dri/.../clients" is read.
	*
	* \param buf output buffer.
	* \param start start of output data.
	* \param offset requested start offset.
	* \param request requested number of bytes.
	* \param eof whether there is no more data to return.
	* \param data private data.
	* \return number of written bytes.
	*/
	static int drm__clients_info(char buf, char *start, off_t offset,
	int request, int eof, void data)
	{
	drm_device_t dev = (drm_device_t ) data;
	int len = 0;
	drm_file_t *priv;

	if (offset > DRM_PROC_LIMIT) {
	*eof = 1;
	return 0;
	}

	*start = &buf[offset];
	*eof = 0;

	DRM_PROC_PRINT("a dev pid uid magic ioctls\n\n");
	for (priv = dev->file_first; priv; priv = priv->next) {
	DRM_PROC_PRINT("%c %3d %5d %5d %10u %10lu\n",
	priv->authenticated ? 'y' : 'n',
	priv->minor,
	priv->pid,
	priv->uid, priv->magic, priv->ioctl_count);
	}

	if (len > request + offset)
	return request;
	*eof = 1;
	return len - offset;
	}

	/**
	* Simply calls _clients_info() while holding the drm_device::struct_mutex lock.
	*/
	static int drm_clients_info(char buf, char *start, off_t offset,
	int request, int eof, void data)
	{
	drm_device_t dev = (drm_device_t ) data;
	int ret;

	mutex_lock(&dev->struct_mutex);
	ret = drm__clients_info(buf, start, offset, request, eof, data);
	mutex_unlock(&dev->struct_mutex);
	return ret;
	}

	#if DRM_DEBUG_CODE

	static int drm__vma_info(char buf, char *start, off_t offset, int request,
	int eof, void data)
	{
	drm_device_t dev = (drm_device_t ) data;
	int len = 0;
	drm_vma_entry_t *pt;
	struct vm_area_struct *vma;
	#if defined(__i386__)
	unsigned int pgprot;
	#endif

	if (offset > DRM_PROC_LIMIT) {
	*eof = 1;
	return 0;
	}

	*start = &buf[offset];
	*eof = 0;

	DRM_PROC_PRINT("vma use count: %d, high_memory = %p, 0x%08lx\n",
	atomic_read(&dev->vma_count),
	high_memory, virt_to_phys(high_memory));
	for (pt = dev->vmalist; pt; pt = pt->next) {
	if (!(vma = pt->vma))
	continue;
	DRM_PROC_PRINT("\n%5d 0x%08lx-0x%08lx %c%c%c%c%c%c 0x%08lx000",
	pt->pid,
	vma->vm_start,
	vma->vm_end,
	vma->vm_flags & VM_READ ? 'r' : '-',
	vma->vm_flags & VM_WRITE ? 'w' : '-',
	vma->vm_flags & VM_EXEC ? 'x' : '-',
	vma->vm_flags & VM_MAYSHARE ? 's' : 'p',
	vma->vm_flags & VM_LOCKED ? 'l' : '-',
	vma->vm_flags & VM_IO ? 'i' : '-',
	vma->vm_pgoff);

	#if defined(__i386__)
	pgprot = pgprot_val(vma->vm_page_prot);
	DRM_PROC_PRINT(" %c%c%c%c%c%c%c%c%c",
	pgprot & _PAGE_PRESENT ? 'p' : '-',
	pgprot & _PAGE_RW ? 'w' : 'r',
	pgprot & _PAGE_USER ? 'u' : 's',
	pgprot & _PAGE_PWT ? 't' : 'b',
	pgprot & _PAGE_PCD ? 'u' : 'c',
	pgprot & _PAGE_ACCESSED ? 'a' : '-',
	pgprot & _PAGE_DIRTY ? 'd' : '-',
	pgprot & _PAGE_PSE ? 'm' : 'k',
	pgprot & _PAGE_GLOBAL ? 'g' : 'l');
	#endif
	DRM_PROC_PRINT("\n");
	}

	if (len > request + offset)
	return request;
	*eof = 1;
	return len - offset;
	}

	static int drm_vma_info(char buf, char *start, off_t offset, int request,
	int eof, void data)
	{
	drm_device_t dev = (drm_device_t ) data;
	int ret;

	mutex_lock(&dev->struct_mutex);
	ret = drm__vma_info(buf, start, offset, request, eof, data);
	mutex_unlock(&dev->struct_mutex);
	return ret;
	}
	#endif