15718399fSFrançois Tigeot /************************************************************************** 25718399fSFrançois Tigeot * 35718399fSFrançois Tigeot * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA 45718399fSFrançois Tigeot * All Rights Reserved. 55718399fSFrançois Tigeot * 65718399fSFrançois Tigeot * Permission is hereby granted, free of charge, to any person obtaining a 75718399fSFrançois Tigeot * copy of this software and associated documentation files (the 85718399fSFrançois Tigeot * "Software"), to deal in the Software without restriction, including 95718399fSFrançois Tigeot * without limitation the rights to use, copy, modify, merge, publish, 105718399fSFrançois Tigeot * distribute, sub license, and/or sell copies of the Software, and to 115718399fSFrançois Tigeot * permit persons to whom the Software is furnished to do so, subject to 125718399fSFrançois Tigeot * the following conditions: 135718399fSFrançois Tigeot * 145718399fSFrançois Tigeot * The above copyright notice and this permission notice (including the 155718399fSFrançois Tigeot * next paragraph) shall be included in all copies or substantial portions 165718399fSFrançois Tigeot * of the Software. 175718399fSFrançois Tigeot * 185718399fSFrançois Tigeot * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 195718399fSFrançois Tigeot * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 205718399fSFrançois Tigeot * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL 215718399fSFrançois Tigeot * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, 225718399fSFrançois Tigeot * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR 235718399fSFrançois Tigeot * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE 245718399fSFrançois Tigeot * USE OR OTHER DEALINGS IN THE SOFTWARE. 255718399fSFrançois Tigeot * 265718399fSFrançois Tigeot **************************************************************************/ 275718399fSFrançois Tigeot /* 285718399fSFrançois Tigeot * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com> 295718399fSFrançois Tigeot */ 305718399fSFrançois Tigeot /* 315718399fSFrançois Tigeot * Copyright (c) 2013 The FreeBSD Foundation 325718399fSFrançois Tigeot * All rights reserved. 335718399fSFrançois Tigeot * 345718399fSFrançois Tigeot * Portions of this software were developed by Konstantin Belousov 355718399fSFrançois Tigeot * <kib@FreeBSD.org> under sponsorship from the FreeBSD Foundation. 365718399fSFrançois Tigeot * 375718399fSFrançois Tigeot *$FreeBSD: head/sys/dev/drm2/ttm/ttm_bo_vm.c 253710 2013-07-27 16:44:37Z kib $ 385718399fSFrançois Tigeot */ 395718399fSFrançois Tigeot 405718399fSFrançois Tigeot #include "opt_vm.h" 415718399fSFrançois Tigeot 42c66857ebSFrançois Tigeot #define pr_fmt(fmt) "[TTM] " fmt 43c66857ebSFrançois Tigeot 44216f7a2cSFrançois Tigeot #include <drm/ttm/ttm_module.h> 45216f7a2cSFrançois Tigeot #include <drm/ttm/ttm_bo_driver.h> 46216f7a2cSFrançois Tigeot #include <drm/ttm/ttm_placement.h> 475718399fSFrançois Tigeot #include <vm/vm.h> 485718399fSFrançois Tigeot #include <vm/vm_page.h> 49797013cfSFrançois Tigeot #include <linux/errno.h> 50c66857ebSFrançois Tigeot #include <linux/export.h> 51ddea3d8dSzrj 52ddea3d8dSzrj RB_GENERATE(ttm_bo_device_buffer_objects, ttm_buffer_object, vm_rb, 53ddea3d8dSzrj ttm_bo_cmp_rb_tree_items); 54ddea3d8dSzrj 555718399fSFrançois Tigeot 565718399fSFrançois Tigeot #define TTM_BO_VM_NUM_PREFAULT 16 575718399fSFrançois Tigeot 58ddea3d8dSzrj int 59ddea3d8dSzrj ttm_bo_cmp_rb_tree_items(struct ttm_buffer_object *a, 60ddea3d8dSzrj struct ttm_buffer_object *b) 61ddea3d8dSzrj { 62ddea3d8dSzrj if (a->vm_node->start < b->vm_node->start) { 63ddea3d8dSzrj return (-1); 64ddea3d8dSzrj } else if (a->vm_node->start > b->vm_node->start) { 65ddea3d8dSzrj return (1); 66ddea3d8dSzrj } else { 67ddea3d8dSzrj return (0); 68ddea3d8dSzrj } 69ddea3d8dSzrj } 70ddea3d8dSzrj 71ddea3d8dSzrj 725718399fSFrançois Tigeot static struct ttm_buffer_object *ttm_bo_vm_lookup_rb(struct ttm_bo_device *bdev, 735718399fSFrançois Tigeot unsigned long page_start, 745718399fSFrançois Tigeot unsigned long num_pages) 755718399fSFrançois Tigeot { 765718399fSFrançois Tigeot unsigned long cur_offset; 775718399fSFrançois Tigeot struct ttm_buffer_object *bo; 785718399fSFrançois Tigeot struct ttm_buffer_object *best_bo = NULL; 795718399fSFrançois Tigeot 80ddea3d8dSzrj bo = RB_ROOT(&bdev->addr_space_rb); 81ddea3d8dSzrj while (bo != NULL) { 825718399fSFrançois Tigeot cur_offset = bo->vm_node->start; 835718399fSFrançois Tigeot if (page_start >= cur_offset) { 845718399fSFrançois Tigeot best_bo = bo; 855718399fSFrançois Tigeot if (page_start == cur_offset) 865718399fSFrançois Tigeot break; 87ddea3d8dSzrj bo = RB_RIGHT(bo, vm_rb); 88c66857ebSFrançois Tigeot } else 89ddea3d8dSzrj bo = RB_LEFT(bo, vm_rb); 905718399fSFrançois Tigeot } 915718399fSFrançois Tigeot 925718399fSFrançois Tigeot if (unlikely(best_bo == NULL)) 935718399fSFrançois Tigeot return NULL; 945718399fSFrançois Tigeot 955718399fSFrançois Tigeot if (unlikely((best_bo->vm_node->start + best_bo->num_pages) < 965718399fSFrançois Tigeot (page_start + num_pages))) 975718399fSFrançois Tigeot return NULL; 985718399fSFrançois Tigeot 995718399fSFrançois Tigeot return best_bo; 1005718399fSFrançois Tigeot } 1015718399fSFrançois Tigeot 1025718399fSFrançois Tigeot static int 1035718399fSFrançois Tigeot ttm_bo_vm_fault(vm_object_t vm_obj, vm_ooffset_t offset, 1045718399fSFrançois Tigeot int prot, vm_page_t *mres) 1055718399fSFrançois Tigeot { 1065718399fSFrançois Tigeot struct ttm_buffer_object *bo = vm_obj->handle; 1075718399fSFrançois Tigeot struct ttm_bo_device *bdev = bo->bdev; 1085718399fSFrançois Tigeot struct ttm_tt *ttm = NULL; 1095718399fSFrançois Tigeot vm_page_t m, m1, oldm; 1105718399fSFrançois Tigeot int ret; 1115718399fSFrançois Tigeot int retval = VM_PAGER_OK; 1125718399fSFrançois Tigeot struct ttm_mem_type_manager *man = 1135718399fSFrançois Tigeot &bdev->man[bo->mem.mem_type]; 1145718399fSFrançois Tigeot 1155718399fSFrançois Tigeot vm_object_pip_add(vm_obj, 1); 1165718399fSFrançois Tigeot oldm = *mres; 1175718399fSFrançois Tigeot if (oldm != NULL) { 1185718399fSFrançois Tigeot vm_page_remove(oldm); 1195718399fSFrançois Tigeot *mres = NULL; 1205718399fSFrançois Tigeot } else 1215718399fSFrançois Tigeot oldm = NULL; 1225718399fSFrançois Tigeot retry: 123*04b45e6fSzrj VM_OBJECT_UNLOCK(vm_obj); 1245718399fSFrançois Tigeot m = NULL; 1255718399fSFrançois Tigeot 1265718399fSFrançois Tigeot reserve: 1275718399fSFrançois Tigeot ret = ttm_bo_reserve(bo, false, false, false, 0); 1285718399fSFrançois Tigeot if (unlikely(ret != 0)) { 1295718399fSFrançois Tigeot if (ret == -EBUSY) { 1305718399fSFrançois Tigeot lwkt_yield(); 1315718399fSFrançois Tigeot goto reserve; 1325718399fSFrançois Tigeot } 1335718399fSFrançois Tigeot } 1345718399fSFrançois Tigeot 1355718399fSFrançois Tigeot if (bdev->driver->fault_reserve_notify) { 1365718399fSFrançois Tigeot ret = bdev->driver->fault_reserve_notify(bo); 1375718399fSFrançois Tigeot switch (ret) { 1385718399fSFrançois Tigeot case 0: 1395718399fSFrançois Tigeot break; 1405718399fSFrançois Tigeot case -EBUSY: 141797013cfSFrançois Tigeot case -ERESTARTSYS: 1425718399fSFrançois Tigeot case -EINTR: 1435718399fSFrançois Tigeot lwkt_yield(); 1445718399fSFrançois Tigeot goto reserve; 1455718399fSFrançois Tigeot default: 1465718399fSFrançois Tigeot retval = VM_PAGER_ERROR; 1475718399fSFrançois Tigeot goto out_unlock; 1485718399fSFrançois Tigeot } 1495718399fSFrançois Tigeot } 1505718399fSFrançois Tigeot 1515718399fSFrançois Tigeot /* 1525718399fSFrançois Tigeot * Wait for buffer data in transit, due to a pipelined 1535718399fSFrançois Tigeot * move. 1545718399fSFrançois Tigeot */ 1555718399fSFrançois Tigeot 1565718399fSFrançois Tigeot lockmgr(&bdev->fence_lock, LK_EXCLUSIVE); 1575718399fSFrançois Tigeot if (test_bit(TTM_BO_PRIV_FLAG_MOVING, &bo->priv_flags)) { 1586f486c69SFrançois Tigeot /* 1596f486c69SFrançois Tigeot * Here, the behavior differs between Linux and FreeBSD. 1606f486c69SFrançois Tigeot * 1616f486c69SFrançois Tigeot * On Linux, the wait is interruptible (3rd argument to 1626f486c69SFrançois Tigeot * ttm_bo_wait). There must be some mechanism to resume 1636f486c69SFrançois Tigeot * page fault handling, once the signal is processed. 1646f486c69SFrançois Tigeot * 1656f486c69SFrançois Tigeot * On FreeBSD, the wait is uninteruptible. This is not a 1666f486c69SFrançois Tigeot * problem as we can't end up with an unkillable process 1676f486c69SFrançois Tigeot * here, because the wait will eventually time out. 1686f486c69SFrançois Tigeot * 1696f486c69SFrançois Tigeot * An example of this situation is the Xorg process 1706f486c69SFrançois Tigeot * which uses SIGALRM internally. The signal could 1716f486c69SFrançois Tigeot * interrupt the wait, causing the page fault to fail 1726f486c69SFrançois Tigeot * and the process to receive SIGSEGV. 1736f486c69SFrançois Tigeot */ 1746f486c69SFrançois Tigeot ret = ttm_bo_wait(bo, false, false, false); 1755718399fSFrançois Tigeot lockmgr(&bdev->fence_lock, LK_RELEASE); 1765718399fSFrançois Tigeot if (unlikely(ret != 0)) { 1775718399fSFrançois Tigeot retval = VM_PAGER_ERROR; 1785718399fSFrançois Tigeot goto out_unlock; 1795718399fSFrançois Tigeot } 1805718399fSFrançois Tigeot } else 1815718399fSFrançois Tigeot lockmgr(&bdev->fence_lock, LK_RELEASE); 1825718399fSFrançois Tigeot 1835718399fSFrançois Tigeot ret = ttm_mem_io_lock(man, true); 1845718399fSFrançois Tigeot if (unlikely(ret != 0)) { 1855718399fSFrançois Tigeot retval = VM_PAGER_ERROR; 1865718399fSFrançois Tigeot goto out_unlock; 1875718399fSFrançois Tigeot } 1885718399fSFrançois Tigeot ret = ttm_mem_io_reserve_vm(bo); 1895718399fSFrançois Tigeot if (unlikely(ret != 0)) { 1905718399fSFrançois Tigeot retval = VM_PAGER_ERROR; 1915718399fSFrançois Tigeot goto out_io_unlock; 1925718399fSFrançois Tigeot } 1935718399fSFrançois Tigeot 1945718399fSFrançois Tigeot /* 1955718399fSFrançois Tigeot * Strictly, we're not allowed to modify vma->vm_page_prot here, 1965718399fSFrançois Tigeot * since the mmap_sem is only held in read mode. However, we 1975718399fSFrançois Tigeot * modify only the caching bits of vma->vm_page_prot and 1985718399fSFrançois Tigeot * consider those bits protected by 1995718399fSFrançois Tigeot * the bo->mutex, as we should be the only writers. 2005718399fSFrançois Tigeot * There shouldn't really be any readers of these bits except 2015718399fSFrançois Tigeot * within vm_insert_mixed()? fork? 2025718399fSFrançois Tigeot * 2035718399fSFrançois Tigeot * TODO: Add a list of vmas to the bo, and change the 2045718399fSFrançois Tigeot * vma->vm_page_prot when the object changes caching policy, with 2055718399fSFrançois Tigeot * the correct locks held. 2065718399fSFrançois Tigeot */ 2075718399fSFrançois Tigeot if (!bo->mem.bus.is_iomem) { 2085718399fSFrançois Tigeot /* Allocate all page at once, most common usage */ 2095718399fSFrançois Tigeot ttm = bo->ttm; 2105718399fSFrançois Tigeot if (ttm->bdev->driver->ttm_tt_populate(ttm)) { 2115718399fSFrançois Tigeot retval = VM_PAGER_ERROR; 2125718399fSFrançois Tigeot goto out_io_unlock; 2135718399fSFrançois Tigeot } 2145718399fSFrançois Tigeot } 2155718399fSFrançois Tigeot 2165718399fSFrançois Tigeot if (bo->mem.bus.is_iomem) { 2175718399fSFrançois Tigeot m = vm_phys_fictitious_to_vm_page(bo->mem.bus.base + 2185718399fSFrançois Tigeot bo->mem.bus.offset + offset); 2195718399fSFrançois Tigeot pmap_page_set_memattr(m, ttm_io_prot(bo->mem.placement)); 2205718399fSFrançois Tigeot } else { 2215718399fSFrançois Tigeot ttm = bo->ttm; 2225718399fSFrançois Tigeot m = ttm->pages[OFF_TO_IDX(offset)]; 2235718399fSFrançois Tigeot if (unlikely(!m)) { 2245718399fSFrançois Tigeot retval = VM_PAGER_ERROR; 2255718399fSFrançois Tigeot goto out_io_unlock; 2265718399fSFrançois Tigeot } 2275718399fSFrançois Tigeot pmap_page_set_memattr(m, 2285718399fSFrançois Tigeot (bo->mem.placement & TTM_PL_FLAG_CACHED) ? 2295718399fSFrançois Tigeot VM_MEMATTR_WRITE_BACK : ttm_io_prot(bo->mem.placement)); 2305718399fSFrançois Tigeot } 2315718399fSFrançois Tigeot 232*04b45e6fSzrj VM_OBJECT_LOCK(vm_obj); 2335718399fSFrançois Tigeot if ((m->flags & PG_BUSY) != 0) { 2345718399fSFrançois Tigeot #if 0 2355718399fSFrançois Tigeot vm_page_sleep(m, "ttmpbs"); 2365718399fSFrançois Tigeot #endif 2375718399fSFrançois Tigeot ttm_mem_io_unlock(man); 2385718399fSFrançois Tigeot ttm_bo_unreserve(bo); 2395718399fSFrançois Tigeot goto retry; 2405718399fSFrançois Tigeot } 2415718399fSFrançois Tigeot m->valid = VM_PAGE_BITS_ALL; 2425718399fSFrançois Tigeot *mres = m; 2435718399fSFrançois Tigeot m1 = vm_page_lookup(vm_obj, OFF_TO_IDX(offset)); 2445718399fSFrançois Tigeot if (m1 == NULL) { 2455718399fSFrançois Tigeot vm_page_insert(m, vm_obj, OFF_TO_IDX(offset)); 2465718399fSFrançois Tigeot } else { 2475718399fSFrançois Tigeot KASSERT(m == m1, 2485718399fSFrançois Tigeot ("inconsistent insert bo %p m %p m1 %p offset %jx", 2495718399fSFrançois Tigeot bo, m, m1, (uintmax_t)offset)); 2505718399fSFrançois Tigeot } 2515718399fSFrançois Tigeot vm_page_busy_try(m, FALSE); 2525718399fSFrançois Tigeot 2535718399fSFrançois Tigeot if (oldm != NULL) { 2545718399fSFrançois Tigeot vm_page_free(oldm); 2555718399fSFrançois Tigeot } 2565718399fSFrançois Tigeot 2575718399fSFrançois Tigeot out_io_unlock1: 2585718399fSFrançois Tigeot ttm_mem_io_unlock(man); 2595718399fSFrançois Tigeot out_unlock1: 2605718399fSFrançois Tigeot ttm_bo_unreserve(bo); 2615718399fSFrançois Tigeot vm_object_pip_wakeup(vm_obj); 2625718399fSFrançois Tigeot return (retval); 2635718399fSFrançois Tigeot 2645718399fSFrançois Tigeot out_io_unlock: 265*04b45e6fSzrj VM_OBJECT_LOCK(vm_obj); 2665718399fSFrançois Tigeot goto out_io_unlock1; 2675718399fSFrançois Tigeot 2685718399fSFrançois Tigeot out_unlock: 269*04b45e6fSzrj VM_OBJECT_LOCK(vm_obj); 2705718399fSFrançois Tigeot goto out_unlock1; 2715718399fSFrançois Tigeot } 2725718399fSFrançois Tigeot 2735718399fSFrançois Tigeot static int 2745718399fSFrançois Tigeot ttm_bo_vm_ctor(void *handle, vm_ooffset_t size, vm_prot_t prot, 2755718399fSFrançois Tigeot vm_ooffset_t foff, struct ucred *cred, u_short *color) 2765718399fSFrançois Tigeot { 2775718399fSFrançois Tigeot 2785718399fSFrançois Tigeot /* 2796f486c69SFrançois Tigeot * On Linux, a reference to the buffer object is acquired here. 2806f486c69SFrançois Tigeot * The reason is that this function is not called when the 2816f486c69SFrançois Tigeot * mmap() is initialized, but only when a process forks for 2826f486c69SFrançois Tigeot * instance. Therefore on Linux, the reference on the bo is 2836f486c69SFrançois Tigeot * acquired either in ttm_bo_mmap() or ttm_bo_vm_open(). It's 2846f486c69SFrançois Tigeot * then released in ttm_bo_vm_close(). 2856f486c69SFrançois Tigeot * 2866f486c69SFrançois Tigeot * Here, this function is called during mmap() intialization. 2876f486c69SFrançois Tigeot * Thus, the reference acquired in ttm_bo_mmap_single() is 2886f486c69SFrançois Tigeot * sufficient. 2895718399fSFrançois Tigeot */ 2905718399fSFrançois Tigeot *color = 0; 2915718399fSFrançois Tigeot return (0); 2925718399fSFrançois Tigeot } 2935718399fSFrançois Tigeot 2945718399fSFrançois Tigeot static void 2955718399fSFrançois Tigeot ttm_bo_vm_dtor(void *handle) 2965718399fSFrançois Tigeot { 2975718399fSFrançois Tigeot struct ttm_buffer_object *bo = handle; 2985718399fSFrançois Tigeot 2995718399fSFrançois Tigeot ttm_bo_unref(&bo); 3005718399fSFrançois Tigeot } 3015718399fSFrançois Tigeot 3025718399fSFrançois Tigeot static struct cdev_pager_ops ttm_pager_ops = { 3035718399fSFrançois Tigeot .cdev_pg_fault = ttm_bo_vm_fault, 3045718399fSFrançois Tigeot .cdev_pg_ctor = ttm_bo_vm_ctor, 3055718399fSFrançois Tigeot .cdev_pg_dtor = ttm_bo_vm_dtor 3065718399fSFrançois Tigeot }; 3075718399fSFrançois Tigeot 3085718399fSFrançois Tigeot int 3095718399fSFrançois Tigeot ttm_bo_mmap_single(struct ttm_bo_device *bdev, vm_ooffset_t *offset, vm_size_t size, 3105718399fSFrançois Tigeot struct vm_object **obj_res, int nprot) 3115718399fSFrançois Tigeot { 3125718399fSFrançois Tigeot struct ttm_bo_driver *driver; 3135718399fSFrançois Tigeot struct ttm_buffer_object *bo; 3145718399fSFrançois Tigeot struct vm_object *vm_obj; 3155718399fSFrançois Tigeot int ret; 3165718399fSFrançois Tigeot 317f6201ebfSMatthew Dillon *obj_res = NULL; 318f6201ebfSMatthew Dillon 3195718399fSFrançois Tigeot lockmgr(&bdev->vm_lock, LK_EXCLUSIVE); 3205718399fSFrançois Tigeot bo = ttm_bo_vm_lookup_rb(bdev, OFF_TO_IDX(*offset), OFF_TO_IDX(size)); 3215718399fSFrançois Tigeot if (likely(bo != NULL)) 322e3b244c9SFrançois Tigeot kref_get(&bo->kref); 3235718399fSFrançois Tigeot lockmgr(&bdev->vm_lock, LK_RELEASE); 3245718399fSFrançois Tigeot 3255718399fSFrançois Tigeot if (unlikely(bo == NULL)) { 3260bece63dSImre Vadasz pr_err("Could not find buffer object to map\n"); 3275718399fSFrançois Tigeot return (EINVAL); 3285718399fSFrançois Tigeot } 3295718399fSFrançois Tigeot 3305718399fSFrançois Tigeot driver = bo->bdev->driver; 3315718399fSFrançois Tigeot if (unlikely(!driver->verify_access)) { 3325718399fSFrançois Tigeot ret = EPERM; 3335718399fSFrançois Tigeot goto out_unref; 3345718399fSFrançois Tigeot } 3355718399fSFrançois Tigeot ret = -driver->verify_access(bo); 3365718399fSFrançois Tigeot if (unlikely(ret != 0)) 3375718399fSFrançois Tigeot goto out_unref; 3385718399fSFrançois Tigeot 3395718399fSFrançois Tigeot vm_obj = cdev_pager_allocate(bo, OBJT_MGTDEVICE, &ttm_pager_ops, 3405718399fSFrançois Tigeot size, nprot, 0, curthread->td_ucred); 341f6201ebfSMatthew Dillon 3425718399fSFrançois Tigeot if (vm_obj == NULL) { 3435718399fSFrançois Tigeot ret = EINVAL; 3445718399fSFrançois Tigeot goto out_unref; 3455718399fSFrançois Tigeot } 3465718399fSFrançois Tigeot /* 3475718399fSFrançois Tigeot * Note: We're transferring the bo reference to vm_obj->handle here. 3485718399fSFrançois Tigeot */ 3495718399fSFrançois Tigeot *offset = 0; 3505718399fSFrançois Tigeot *obj_res = vm_obj; 3515718399fSFrançois Tigeot return 0; 3525718399fSFrançois Tigeot out_unref: 3535718399fSFrançois Tigeot ttm_bo_unref(&bo); 3545718399fSFrançois Tigeot return ret; 3555718399fSFrançois Tigeot } 356c66857ebSFrançois Tigeot EXPORT_SYMBOL(ttm_bo_mmap); 3575718399fSFrançois Tigeot 3586f486c69SFrançois Tigeot void 3596f486c69SFrançois Tigeot ttm_bo_release_mmap(struct ttm_buffer_object *bo) 3606f486c69SFrançois Tigeot { 3616f486c69SFrançois Tigeot vm_object_t vm_obj; 3626f486c69SFrançois Tigeot vm_page_t m; 3636f486c69SFrançois Tigeot int i; 3646f486c69SFrançois Tigeot 3656f486c69SFrançois Tigeot vm_obj = cdev_pager_lookup(bo); 3666f486c69SFrançois Tigeot if (vm_obj == NULL) 3676f486c69SFrançois Tigeot return; 3686f486c69SFrançois Tigeot 369*04b45e6fSzrj VM_OBJECT_LOCK(vm_obj); 3706f486c69SFrançois Tigeot for (i = 0; i < bo->num_pages; i++) { 3716f486c69SFrançois Tigeot m = vm_page_lookup_busy_wait(vm_obj, i, TRUE, "ttm_unm"); 3726f486c69SFrançois Tigeot if (m == NULL) 3736f486c69SFrançois Tigeot continue; 3746f486c69SFrançois Tigeot cdev_pager_free_page(vm_obj, m); 3756f486c69SFrançois Tigeot } 376*04b45e6fSzrj VM_OBJECT_UNLOCK(vm_obj); 3776f486c69SFrançois Tigeot 3786f486c69SFrançois Tigeot vm_object_deallocate(vm_obj); 3796f486c69SFrançois Tigeot } 3806f486c69SFrançois Tigeot 3815718399fSFrançois Tigeot #if 0 3825718399fSFrançois Tigeot int ttm_fbdev_mmap(struct vm_area_struct *vma, struct ttm_buffer_object *bo) 3835718399fSFrançois Tigeot { 3845718399fSFrançois Tigeot if (vma->vm_pgoff != 0) 3855718399fSFrançois Tigeot return -EACCES; 3865718399fSFrançois Tigeot 3875718399fSFrançois Tigeot vma->vm_ops = &ttm_bo_vm_ops; 3885718399fSFrançois Tigeot vma->vm_private_data = ttm_bo_reference(bo); 3895718399fSFrançois Tigeot vma->vm_flags |= VM_IO | VM_MIXEDMAP | VM_DONTEXPAND; 3905718399fSFrançois Tigeot return 0; 3915718399fSFrançois Tigeot } 392c66857ebSFrançois Tigeot EXPORT_SYMBOL(ttm_fbdev_mmap); 3935718399fSFrançois Tigeot #endif 394