-unsigned long drm_alloc_pages (int order, int area) {
- unsigned long address;
- unsigned long bytes = PAGE_SIZE << order;
- unsigned long addr;
- unsigned int sz;
-
- spin_lock(&drm_mem_lock);
- if ((drm_ram_used >> PAGE_SHIFT)
- > (DRM_RAM_PERCENT * drm_ram_available) / 100) {
- spin_unlock(&drm_mem_lock);
- return 0;
- }
- spin_unlock(&drm_mem_lock);
-
- address = __get_free_pages(GFP_KERNEL|__GFP_COMP, order);
- if (!address) {
- spin_lock(&drm_mem_lock);
- ++drm_mem_stats[area].fail_count;
- spin_unlock(&drm_mem_lock);
- return 0;
- }
- spin_lock(&drm_mem_lock);
- ++drm_mem_stats[area].succeed_count;
- drm_mem_stats[area].bytes_allocated += bytes;
- drm_ram_used += bytes;
- spin_unlock(&drm_mem_lock);
-
- /* Zero outside the lock */
- memset((void *)address, 0, bytes);
-
- /* Reserve */
- for (addr = address, sz = bytes;
- sz > 0; addr += PAGE_SIZE, sz -= PAGE_SIZE) {
- SetPageReserved(virt_to_page(addr));
- }
-
- return address;
-}
-
-void drm_free_pages (unsigned long address, int order, int area) {
- unsigned long bytes = PAGE_SIZE << order;
- int alloc_count;
- int free_count;
- unsigned long addr;
- unsigned int sz;
-
- if (!address) {
- DRM_MEM_ERROR(area, "Attempt to free address 0\n");
- } else {
- /* Unreserve */
- for (addr = address, sz = bytes;
- sz > 0; addr += PAGE_SIZE, sz -= PAGE_SIZE) {
- ClearPageReserved(virt_to_page(addr));
- }
- free_pages(address, order);
- }
-
- spin_lock(&drm_mem_lock);
- free_count = ++drm_mem_stats[area].free_count;
- alloc_count = drm_mem_stats[area].succeed_count;
- drm_mem_stats[area].bytes_freed += bytes;
- drm_ram_used -= bytes;
- 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);
- }
-}
-