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drm_memory_debug.h

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/**
 * \file drm_memory_debug.h
 * Memory management wrappers for DRM.
 *
 * \author Rickard E. (Rik) Faith <faith@valinux.com>
 * \author Gareth Hughes <gareth@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"

typedef struct drm_mem_stats {
      const char *name;
      int succeed_count;
      int free_count;
      int fail_count;
      unsigned long bytes_allocated;
      unsigned long bytes_freed;
} drm_mem_stats_t;

static DEFINE_SPINLOCK(drm_mem_lock);
static unsigned long drm_ram_available = 0;     /* In pages */
static unsigned long drm_ram_used = 0;
static drm_mem_stats_t drm_mem_stats[] =
{
      [DRM_MEM_DMA] = {"dmabufs"},
      [DRM_MEM_SAREA] = {"sareas"},
      [DRM_MEM_DRIVER] = {"driver"},
      [DRM_MEM_MAGIC] = {"magic"},
      [DRM_MEM_IOCTLS] = {"ioctltab"},
      [DRM_MEM_MAPS] = {"maplist"},
      [DRM_MEM_VMAS] = {"vmalist"},
      [DRM_MEM_BUFS] = {"buflist"},
      [DRM_MEM_SEGS] = {"seglist"},
      [DRM_MEM_PAGES] = {"pagelist"},
      [DRM_MEM_FILES] = {"files"},
      [DRM_MEM_QUEUES] = {"queues"},
      [DRM_MEM_CMDS] = {"commands"},
      [DRM_MEM_MAPPINGS] = {"mappings"},
      [DRM_MEM_BUFLISTS] = {"buflists"},
      [DRM_MEM_AGPLISTS] = {"agplist"},
      [DRM_MEM_SGLISTS] = {"sglist"},
      [DRM_MEM_TOTALAGP] = {"totalagp"},
      [DRM_MEM_BOUNDAGP] = {"boundagp"},
      [DRM_MEM_CTXBITMAP] = {"ctxbitmap"},
      [DRM_MEM_CTXLIST] = {"ctxlist"},
      [DRM_MEM_STUB] = {"stub"},
      {NULL, 0,}        /* Last entry must be null */
};

void drm_mem_init (void) {
      drm_mem_stats_t *mem;
      struct sysinfo si;

      for (mem = drm_mem_stats; mem->name; ++mem) {
            mem->succeed_count = 0;
            mem->free_count = 0;
            mem->fail_count = 0;
            mem->bytes_allocated = 0;
            mem->bytes_freed = 0;
      }

      si_meminfo(&si);
      drm_ram_available = si.totalram;
      drm_ram_used = 0;
}

/* drm_mem_info is called whenever a process reads /dev/drm/mem. */

static int drm__mem_info (char *buf, char **start, off_t offset,
                     int request, int *eof, void *data) {
      drm_mem_stats_t *pt;
      int len = 0;

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

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

      DRM_PROC_PRINT("          total counts                "
                   " |    outstanding  \n");
      DRM_PROC_PRINT("type       alloc freed fail     bytes    freed"
                   " | allocs      bytes\n\n");
      DRM_PROC_PRINT("%-9.9s %5d %5d %4d %10lu kB         |\n",
                   "system", 0, 0, 0,
                   drm_ram_available << (PAGE_SHIFT - 10));
      DRM_PROC_PRINT("%-9.9s %5d %5d %4d %10lu kB         |\n",
                   "locked", 0, 0, 0, drm_ram_used >> 10);
      DRM_PROC_PRINT("\n");
      for (pt = drm_mem_stats; pt->name; pt++) {
            DRM_PROC_PRINT("%-9.9s %5d %5d %4d %10lu %10lu | %6d %10ld\n",
                         pt->name,
                         pt->succeed_count,
                         pt->free_count,
                         pt->fail_count,
                         pt->bytes_allocated,
                         pt->bytes_freed,
                         pt->succeed_count - pt->free_count,
                         (long)pt->bytes_allocated
                         - (long)pt->bytes_freed);
      }

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

int drm_mem_info (char *buf, char **start, off_t offset,
               int len, int *eof, void *data) {
      int ret;

      spin_lock(&drm_mem_lock);
      ret = drm__mem_info (buf, start, offset, len, eof, data);
      spin_unlock(&drm_mem_lock);
      return ret;
}

void *drm_alloc (size_t size, int area) {
      void *pt;

      if (!size) {
            DRM_MEM_ERROR(area, "Allocating 0 bytes\n");
            return NULL;
      }

      if (!(pt = kmalloc(size, GFP_KERNEL))) {
            spin_lock(&drm_mem_lock);
            ++drm_mem_stats[area].fail_count;
            spin_unlock(&drm_mem_lock);
            return NULL;
      }
      spin_lock(&drm_mem_lock);
      ++drm_mem_stats[area].succeed_count;
      drm_mem_stats[area].bytes_allocated += size;
      spin_unlock(&drm_mem_lock);
      return pt;
}

void *drm_calloc (size_t nmemb, size_t size, int area) {
      void *addr;

      addr = drm_alloc (nmemb * size, area);
      if (addr != NULL)
            memset((void *)addr, 0, size * nmemb);

      return addr;
}

void *drm_realloc (void *oldpt, size_t oldsize, size_t size, int area) {
      void *pt;

      if (!(pt = drm_alloc (size, area)))
            return NULL;
      if (oldpt && oldsize) {
            memcpy(pt, oldpt, oldsize);
            drm_free (oldpt, oldsize, area);
      }
      return pt;
}

void drm_free (void *pt, size_t size, int area) {
      int alloc_count;
      int free_count;

      if (!pt)
            DRM_MEM_ERROR(area, "Attempt to free NULL pointer\n");
      else
            kfree(pt);
      spin_lock(&drm_mem_lock);
      drm_mem_stats[area].bytes_freed += size;
      free_count = ++drm_mem_stats[area].free_count;
      alloc_count = drm_mem_stats[area].succeed_count;
      spin_unlock(&drm_mem_lock);
      if (free_count > alloc_count) {
            DRM_MEM_ERROR(area, "Excess frees: %d frees, %d allocs\n",
                        free_count, alloc_count);
      }
}

#if __OS_HAS_AGP

DRM_AGP_MEM *drm_alloc_agp (drm_device_t *dev, int pages, u32 type) {
      DRM_AGP_MEM *handle;

      if (!pages) {
            DRM_MEM_ERROR(DRM_MEM_TOTALAGP, "Allocating 0 pages\n");
            return NULL;
      }

      if ((handle = drm_agp_allocate_memory (pages, type))) {
            spin_lock(&drm_mem_lock);
            ++drm_mem_stats[DRM_MEM_TOTALAGP].succeed_count;
            drm_mem_stats[DRM_MEM_TOTALAGP].bytes_allocated
                += pages << PAGE_SHIFT;
            spin_unlock(&drm_mem_lock);
            return handle;
      }
      spin_lock(&drm_mem_lock);
      ++drm_mem_stats[DRM_MEM_TOTALAGP].fail_count;
      spin_unlock(&drm_mem_lock);
      return NULL;
}

int drm_free_agp (DRM_AGP_MEM * handle, int pages) {
      int alloc_count;
      int free_count;
      int retval = -EINVAL;

      if (!handle) {
            DRM_MEM_ERROR(DRM_MEM_TOTALAGP,
                        "Attempt to free NULL AGP handle\n");
            return retval;
      }

      if (drm_agp_free_memory (handle)) {
            spin_lock(&drm_mem_lock);
            free_count = ++drm_mem_stats[DRM_MEM_TOTALAGP].free_count;
            alloc_count = drm_mem_stats[DRM_MEM_TOTALAGP].succeed_count;
            drm_mem_stats[DRM_MEM_TOTALAGP].bytes_freed
                += pages << PAGE_SHIFT;
            spin_unlock(&drm_mem_lock);
            if (free_count > alloc_count) {
                  DRM_MEM_ERROR(DRM_MEM_TOTALAGP,
                              "Excess frees: %d frees, %d allocs\n",
                              free_count, alloc_count);
            }
            return 0;
      }
      return retval;
}

int drm_bind_agp (DRM_AGP_MEM * handle, unsigned int start) {
      int retcode = -EINVAL;

      if (!handle) {
            DRM_MEM_ERROR(DRM_MEM_BOUNDAGP,
                        "Attempt to bind NULL AGP handle\n");
            return retcode;
      }

      if (!(retcode = drm_agp_bind_memory (handle, start))) {
            spin_lock(&drm_mem_lock);
            ++drm_mem_stats[DRM_MEM_BOUNDAGP].succeed_count;
            drm_mem_stats[DRM_MEM_BOUNDAGP].bytes_allocated
                += handle->page_count << PAGE_SHIFT;
            spin_unlock(&drm_mem_lock);
            return retcode;
      }
      spin_lock(&drm_mem_lock);
      ++drm_mem_stats[DRM_MEM_BOUNDAGP].fail_count;
      spin_unlock(&drm_mem_lock);
      return retcode;
}

int drm_unbind_agp (DRM_AGP_MEM * handle) {
      int alloc_count;
      int free_count;
      int retcode = -EINVAL;

      if (!handle) {
            DRM_MEM_ERROR(DRM_MEM_BOUNDAGP,
                        "Attempt to unbind NULL AGP handle\n");
            return retcode;
      }

      if ((retcode = drm_agp_unbind_memory (handle)))
            return retcode;
      spin_lock(&drm_mem_lock);
      free_count = ++drm_mem_stats[DRM_MEM_BOUNDAGP].free_count;
      alloc_count = drm_mem_stats[DRM_MEM_BOUNDAGP].succeed_count;
      drm_mem_stats[DRM_MEM_BOUNDAGP].bytes_freed
          += handle->page_count << PAGE_SHIFT;
      spin_unlock(&drm_mem_lock);
      if (free_count > alloc_count) {
            DRM_MEM_ERROR(DRM_MEM_BOUNDAGP,
                        "Excess frees: %d frees, %d allocs\n",
                        free_count, alloc_count);
      }
      return retcode;
}
#endif

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