proc.c

内核linux2.4.20,可跟rtlinux3.2打补丁 组成实时linux系统,编译内核

/* proc.c -- /proc support for DRM -*- linux-c -*-
 * Created: Mon Jan 11 09:48:47 1999 by [e-mail]
 *
 * 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
 * PRECISION INSIGHT AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, DAMAGES OR
 * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
 * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 * DEALINGS IN THE SOFTWARE.
 *
 * Authors:
 *    Rickard E. (Rik) Faith <[e-mail]>
 */

#define __NO_VERSION__
#include "drmP.h"

static struct proc_dir_entry *drm_root	   = NULL;
static struct proc_dir_entry *drm_dev_root = NULL;
static char		     drm_slot_name[64];

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

struct drm_proc_list {
	const char *name;
	int	   (*f)(char *, char **, off_t, int, int *, void *);
} 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
#if DRM_DMA_HISTOGRAM
	{ "histo",   drm_histo_info   },
#endif
};
#define DRM_PROC_ENTRIES (sizeof(drm_proc_list)/sizeof(drm_proc_list[0]))

int drm_proc_init(drm_device_t *dev)
{
	struct proc_dir_entry *ent;
	int		      i, j;

	drm_root = create_proc_entry("dri", S_IFDIR, NULL);
	if (!drm_root) {
		DRM_ERROR("Cannot create /proc/dri\n");
		return -1;
	}

				/* Instead of doing this search, we should
				   add some global support for /proc/dri. */
	for (i = 0; i < 8; i++) {
		sprintf(drm_slot_name, "dri/%d", i);
		drm_dev_root = create_proc_entry(drm_slot_name, S_IFDIR, NULL);
		if (!drm_dev_root) {
			DRM_ERROR("Cannot create /proc/%s\n", drm_slot_name);
			remove_proc_entry("dri", NULL);
			break;
		}
		if (drm_dev_root->nlink == 2) break;
		drm_dev_root = NULL;
	}
	if (!drm_dev_root) {
		DRM_ERROR("Cannot find slot in /proc/dri\n");
		return -1;
	}

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

	return 0;
}


int drm_proc_cleanup(void)
{
	int i;
	
	if (drm_root) {
		if (drm_dev_root) {
			for (i = 0; i < DRM_PROC_ENTRIES; i++) {
				remove_proc_entry(drm_proc_list[i].name,
						  drm_dev_root);
			}
			remove_proc_entry(drm_slot_name, NULL);
		}
		remove_proc_entry("dri", NULL);
		remove_proc_entry(DRM_NAME, NULL);
	}
	drm_root = drm_dev_root = NULL;
	return 0;
}

static int drm_name_info(char *buf, char **start, off_t offset, int len,
			 int *eof, void *data)
{
	drm_device_t *dev = (drm_device_t *)data;

	if (offset > 0) return 0; /* no partial requests */
	len  = 0;
	*eof = 1;

	if (dev->unique) {
		DRM_PROC_PRINT("%s 0x%x %s\n",
			       dev->name, dev->device, dev->unique);
	} else {
		DRM_PROC_PRINT("%s 0x%x\n", dev->name, dev->device);
	}
	return len;
}

static int _drm_vm_info(char *buf, char **start, off_t offset, int len,
			int *eof, void *data)
{
	drm_device_t *dev = (drm_device_t *)data;
	drm_map_t    *map;
				/* Hardcoded from _DRM_FRAME_BUFFER,
                                   _DRM_REGISTERS, _DRM_SHM, and
                                   _DRM_AGP. */
	const char   *types[] = { "FB", "REG", "SHM", "AGP" };
	const char   *type;
	int	     i;

	if (offset > 0) return 0; /* no partial requests */
	len  = 0;
	*eof = 1;
	DRM_PROC_PRINT("slot	 offset	      size type flags	 "
		       "address mtrr\n\n");
	for (i = 0; i < dev->map_count; i++) {
		map = dev->maplist[i];
		if (map->type < 0 || map->type > 3) type = "??";
		else				    type = types[map->type];
		DRM_PROC_PRINT("%4d 0x%08lx 0x%08lx %4.4s  0x%02x 0x%08lx ",
			       i,
			       map->offset,
			       map->size,
			       type,
			       map->flags,
			       (unsigned long)map->handle);
		if (map->mtrr < 0) {
			DRM_PROC_PRINT("none\n");
		} else {
			DRM_PROC_PRINT("%4d\n", map->mtrr);
		}
	}

	return len;
}

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

	down(&dev->struct_sem);
	ret = _drm_vm_info(buf, start, offset, len, eof, data);
	up(&dev->struct_sem);
	return ret;
}


static int _drm_queues_info(char *buf, char **start, off_t offset, int len,
			    int *eof, void *data)
{
	drm_device_t *dev = (drm_device_t *)data;
	int	     i;
	drm_queue_t  *q;

	if (offset > 0) return 0; /* no partial requests */
	len  = 0;
	*eof = 1;
	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 %10d %10d %10d\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_read(&q->total_flushed),
				   atomic_read(&q->total_queued),
				   atomic_read(&q->total_locks));
		atomic_dec(&q->use_count);
	}
	
	return len;
}

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

	down(&dev->struct_sem);
	ret = _drm_queues_info(buf, start, offset, len, eof, data);
	up(&dev->struct_sem);
	return ret;
}

/* drm_bufs_info is called whenever a process reads
   /dev/drm/<dev>/bufs. */

static int _drm_bufs_info(char *buf, char **start, off_t offset, int len,
			  int *eof, void *data)
{
	drm_device_t	 *dev = (drm_device_t *)data;
	drm_device_dma_t *dma = dev->dma;
	int		 i;

	if (!dma)	return 0;
	if (offset > 0) return 0; /* no partial requests */
	len  = 0;
	*eof = 1;
	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),