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drm_proc.c

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/**
 * \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.
 */
00060 static struct drm_proc_list {
00061       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%".
 */
00090 int drm_proc_init(struct drm_device * 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().
 */
00133 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.
 */
00163 static int drm_name_info(char *buf, char **start, off_t offset, int request,
                   int *eof, void *data)
{
      struct drm_device *dev = (struct drm_device *) 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.
 */
00205 static int drm__vm_info(char *buf, char **start, off_t offset, int request,
                  int *eof, void *data)
{
      struct drm_device *dev = (struct drm_device *) data;
      int len = 0;
      struct drm_map *map;
      struct drm_map_list *r_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;
      list_for_each_entry(r_list, &dev->maplist, 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.
 */
00261 static int drm_vm_info(char *buf, char **start, off_t offset, int request,
                   int *eof, void *data)
{
      struct drm_device *dev = (struct drm_device *) 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.
 */
00284 static int drm__queues_info(char *buf, char **start, off_t offset,
                      int request, int *eof, void *data)
{
      struct drm_device *dev = (struct drm_device *) data;
      int len = 0;
      int i;
      struct drm_queue *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.
 */
00334 static int drm_queues_info(char *buf, char **start, off_t offset, int request,
                     int *eof, void *data)
{
      struct drm_device *dev = (struct drm_device *) 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.
 */
00357 static int drm__bufs_info(char *buf, char **start, off_t offset, int request,
                    int *eof, void *data)
{
      struct drm_device *dev = (struct drm_device *) data;
      int len = 0;
      struct drm_device_dma *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.
 */
00406 static int drm_bufs_info(char *buf, char **start, off_t offset, int request,
                   int *eof, void *data)
{
      struct drm_device *dev = (struct drm_device *) 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.
 */
00429 static int drm__clients_info(char *buf, char **start, off_t offset,
                       int request, int *eof, void *data)
{
      struct drm_device *dev = (struct drm_device *) data;
      int len = 0;
      struct drm_file *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");
      list_for_each_entry(priv, &dev->filelist, lhead) {
            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.
 */
00462 static int drm_clients_info(char *buf, char **start, off_t offset,
                      int request, int *eof, void *data)
{
      struct drm_device *dev = (struct drm_device *) 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)
{
      struct drm_device *dev = (struct drm_device *) data;
      int len = 0;
      struct drm_vma_entry *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));
      list_for_each_entry(pt, &dev->vmalist, head) {
            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)
{
      struct drm_device *dev = (struct drm_device *) 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

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