Thomas Hellstrom | ba4e7d9 | 2009-06-10 15:20:19 +0200 | [diff] [blame] | 1 | /************************************************************************** |
| 2 | * |
| 3 | * Copyright (c) 2006-2009 VMware, Inc., Palo Alto, CA., USA |
| 4 | * All Rights Reserved. |
| 5 | * |
| 6 | * Permission is hereby granted, free of charge, to any person obtaining a |
| 7 | * copy of this software and associated documentation files (the |
| 8 | * "Software"), to deal in the Software without restriction, including |
| 9 | * without limitation the rights to use, copy, modify, merge, publish, |
| 10 | * distribute, sub license, and/or sell copies of the Software, and to |
| 11 | * permit persons to whom the Software is furnished to do so, subject to |
| 12 | * the following conditions: |
| 13 | * |
| 14 | * The above copyright notice and this permission notice (including the |
| 15 | * next paragraph) shall be included in all copies or substantial portions |
| 16 | * of the Software. |
| 17 | * |
| 18 | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
| 19 | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
| 20 | * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL |
| 21 | * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM, |
| 22 | * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR |
| 23 | * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE |
| 24 | * USE OR OTHER DEALINGS IN THE SOFTWARE. |
| 25 | * |
| 26 | **************************************************************************/ |
| 27 | /* |
| 28 | * Authors: Thomas Hellstrom <thellstrom-at-vmware-dot-com> |
| 29 | */ |
| 30 | |
Joe Perches | 25d0479 | 2012-03-16 21:43:50 -0700 | [diff] [blame] | 31 | #define pr_fmt(fmt) "[TTM] " fmt |
| 32 | |
Thomas Hellstrom | ba4e7d9 | 2009-06-10 15:20:19 +0200 | [diff] [blame] | 33 | #include <ttm/ttm_module.h> |
| 34 | #include <ttm/ttm_bo_driver.h> |
| 35 | #include <ttm/ttm_placement.h> |
David Herrmann | 72525b3 | 2013-07-24 21:08:53 +0200 | [diff] [blame] | 36 | #include <drm/drm_vma_manager.h> |
Thomas Hellstrom | ba4e7d9 | 2009-06-10 15:20:19 +0200 | [diff] [blame] | 37 | #include <linux/mm.h> |
Thomas Hellstrom | ba4e7d9 | 2009-06-10 15:20:19 +0200 | [diff] [blame] | 38 | #include <linux/rbtree.h> |
| 39 | #include <linux/module.h> |
| 40 | #include <linux/uaccess.h> |
| 41 | |
| 42 | #define TTM_BO_VM_NUM_PREFAULT 16 |
| 43 | |
Thomas Hellstrom | cbe12e7 | 2013-10-09 03:18:07 -0700 | [diff] [blame] | 44 | static int ttm_bo_vm_fault_idle(struct ttm_buffer_object *bo, |
| 45 | struct vm_area_struct *vma, |
| 46 | struct vm_fault *vmf) |
| 47 | { |
| 48 | struct ttm_bo_device *bdev = bo->bdev; |
| 49 | int ret = 0; |
| 50 | |
| 51 | spin_lock(&bdev->fence_lock); |
| 52 | if (likely(!test_bit(TTM_BO_PRIV_FLAG_MOVING, &bo->priv_flags))) |
| 53 | goto out_unlock; |
| 54 | |
| 55 | /* |
| 56 | * Quick non-stalling check for idle. |
| 57 | */ |
| 58 | ret = ttm_bo_wait(bo, false, false, true); |
| 59 | if (likely(ret == 0)) |
| 60 | goto out_unlock; |
| 61 | |
| 62 | /* |
| 63 | * If possible, avoid waiting for GPU with mmap_sem |
| 64 | * held. |
| 65 | */ |
| 66 | if (vmf->flags & FAULT_FLAG_ALLOW_RETRY) { |
| 67 | ret = VM_FAULT_RETRY; |
| 68 | if (vmf->flags & FAULT_FLAG_RETRY_NOWAIT) |
| 69 | goto out_unlock; |
| 70 | |
| 71 | up_read(&vma->vm_mm->mmap_sem); |
| 72 | (void) ttm_bo_wait(bo, false, true, false); |
| 73 | goto out_unlock; |
| 74 | } |
| 75 | |
| 76 | /* |
| 77 | * Ordinary wait. |
| 78 | */ |
| 79 | ret = ttm_bo_wait(bo, false, true, false); |
| 80 | if (unlikely(ret != 0)) |
| 81 | ret = (ret != -ERESTARTSYS) ? VM_FAULT_SIGBUS : |
| 82 | VM_FAULT_NOPAGE; |
| 83 | |
| 84 | out_unlock: |
| 85 | spin_unlock(&bdev->fence_lock); |
| 86 | return ret; |
| 87 | } |
| 88 | |
Thomas Hellstrom | ba4e7d9 | 2009-06-10 15:20:19 +0200 | [diff] [blame] | 89 | static int ttm_bo_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf) |
| 90 | { |
| 91 | struct ttm_buffer_object *bo = (struct ttm_buffer_object *) |
| 92 | vma->vm_private_data; |
| 93 | struct ttm_bo_device *bdev = bo->bdev; |
Thomas Hellstrom | ba4e7d9 | 2009-06-10 15:20:19 +0200 | [diff] [blame] | 94 | unsigned long page_offset; |
| 95 | unsigned long page_last; |
| 96 | unsigned long pfn; |
| 97 | struct ttm_tt *ttm = NULL; |
| 98 | struct page *page; |
| 99 | int ret; |
| 100 | int i; |
Thomas Hellstrom | ba4e7d9 | 2009-06-10 15:20:19 +0200 | [diff] [blame] | 101 | unsigned long address = (unsigned long)vmf->virtual_address; |
| 102 | int retval = VM_FAULT_NOPAGE; |
Thomas Hellstrom | eba6709 | 2010-11-11 09:41:57 +0100 | [diff] [blame] | 103 | struct ttm_mem_type_manager *man = |
| 104 | &bdev->man[bo->mem.mem_type]; |
Thomas Hellstrom | 3943875 | 2013-11-06 09:32:59 -0800 | [diff] [blame^] | 105 | struct vm_area_struct cvma; |
Thomas Hellstrom | ba4e7d9 | 2009-06-10 15:20:19 +0200 | [diff] [blame] | 106 | |
| 107 | /* |
| 108 | * Work around locking order reversal in fault / nopfn |
| 109 | * between mmap_sem and bo_reserve: Perform a trylock operation |
| 110 | * for reserve, and if it fails, retry the fault after scheduling. |
| 111 | */ |
| 112 | |
| 113 | ret = ttm_bo_reserve(bo, true, true, false, 0); |
| 114 | if (unlikely(ret != 0)) { |
| 115 | if (ret == -EBUSY) |
| 116 | set_need_resched(); |
| 117 | return VM_FAULT_NOPAGE; |
| 118 | } |
| 119 | |
Jerome Glisse | 82c5da6 | 2010-04-09 14:39:23 +0200 | [diff] [blame] | 120 | if (bdev->driver->fault_reserve_notify) { |
| 121 | ret = bdev->driver->fault_reserve_notify(bo); |
| 122 | switch (ret) { |
| 123 | case 0: |
| 124 | break; |
| 125 | case -EBUSY: |
| 126 | set_need_resched(); |
| 127 | case -ERESTARTSYS: |
| 128 | retval = VM_FAULT_NOPAGE; |
| 129 | goto out_unlock; |
| 130 | default: |
| 131 | retval = VM_FAULT_SIGBUS; |
| 132 | goto out_unlock; |
| 133 | } |
| 134 | } |
Dave Airlie | e024e11 | 2009-06-24 09:48:08 +1000 | [diff] [blame] | 135 | |
Thomas Hellstrom | ba4e7d9 | 2009-06-10 15:20:19 +0200 | [diff] [blame] | 136 | /* |
| 137 | * Wait for buffer data in transit, due to a pipelined |
| 138 | * move. |
| 139 | */ |
Thomas Hellstrom | cbe12e7 | 2013-10-09 03:18:07 -0700 | [diff] [blame] | 140 | ret = ttm_bo_vm_fault_idle(bo, vma, vmf); |
| 141 | if (unlikely(ret != 0)) { |
| 142 | retval = ret; |
| 143 | goto out_unlock; |
| 144 | } |
Thomas Hellstrom | ba4e7d9 | 2009-06-10 15:20:19 +0200 | [diff] [blame] | 145 | |
Thomas Hellstrom | eba6709 | 2010-11-11 09:41:57 +0100 | [diff] [blame] | 146 | ret = ttm_mem_io_lock(man, true); |
| 147 | if (unlikely(ret != 0)) { |
| 148 | retval = VM_FAULT_NOPAGE; |
Thomas Hellstrom | ba4e7d9 | 2009-06-10 15:20:19 +0200 | [diff] [blame] | 149 | goto out_unlock; |
| 150 | } |
Thomas Hellstrom | eba6709 | 2010-11-11 09:41:57 +0100 | [diff] [blame] | 151 | ret = ttm_mem_io_reserve_vm(bo); |
| 152 | if (unlikely(ret != 0)) { |
| 153 | retval = VM_FAULT_SIGBUS; |
| 154 | goto out_io_unlock; |
| 155 | } |
Thomas Hellstrom | ba4e7d9 | 2009-06-10 15:20:19 +0200 | [diff] [blame] | 156 | |
Thomas Hellstrom | ba4e7d9 | 2009-06-10 15:20:19 +0200 | [diff] [blame] | 157 | page_offset = ((address - vma->vm_start) >> PAGE_SHIFT) + |
David Herrmann | 72525b3 | 2013-07-24 21:08:53 +0200 | [diff] [blame] | 158 | drm_vma_node_start(&bo->vma_node) - vma->vm_pgoff; |
Libin | 025df77 | 2013-04-15 20:48:57 +0800 | [diff] [blame] | 159 | page_last = vma_pages(vma) + |
David Herrmann | 72525b3 | 2013-07-24 21:08:53 +0200 | [diff] [blame] | 160 | drm_vma_node_start(&bo->vma_node) - vma->vm_pgoff; |
Thomas Hellstrom | ba4e7d9 | 2009-06-10 15:20:19 +0200 | [diff] [blame] | 161 | |
| 162 | if (unlikely(page_offset >= bo->num_pages)) { |
| 163 | retval = VM_FAULT_SIGBUS; |
Thomas Hellstrom | eba6709 | 2010-11-11 09:41:57 +0100 | [diff] [blame] | 164 | goto out_io_unlock; |
Thomas Hellstrom | ba4e7d9 | 2009-06-10 15:20:19 +0200 | [diff] [blame] | 165 | } |
| 166 | |
| 167 | /* |
Thomas Hellstrom | 3943875 | 2013-11-06 09:32:59 -0800 | [diff] [blame^] | 168 | * Make a local vma copy to modify the page_prot member |
| 169 | * and vm_flags if necessary. The vma parameter is protected |
| 170 | * by mmap_sem in write mode. |
Thomas Hellstrom | ba4e7d9 | 2009-06-10 15:20:19 +0200 | [diff] [blame] | 171 | */ |
Thomas Hellstrom | 3943875 | 2013-11-06 09:32:59 -0800 | [diff] [blame^] | 172 | cvma = *vma; |
| 173 | cvma.vm_page_prot = vm_get_page_prot(cvma.vm_flags); |
| 174 | |
Jerome Glisse | 82c5da6 | 2010-04-09 14:39:23 +0200 | [diff] [blame] | 175 | if (bo->mem.bus.is_iomem) { |
Thomas Hellstrom | 3943875 | 2013-11-06 09:32:59 -0800 | [diff] [blame^] | 176 | cvma.vm_page_prot = ttm_io_prot(bo->mem.placement, |
| 177 | cvma.vm_page_prot); |
Thomas Hellstrom | ba4e7d9 | 2009-06-10 15:20:19 +0200 | [diff] [blame] | 178 | } else { |
| 179 | ttm = bo->ttm; |
Thomas Hellstrom | 3943875 | 2013-11-06 09:32:59 -0800 | [diff] [blame^] | 180 | if (!(bo->mem.placement & TTM_PL_FLAG_CACHED)) |
| 181 | cvma.vm_page_prot = ttm_io_prot(bo->mem.placement, |
| 182 | cvma.vm_page_prot); |
Jerome Glisse | b1e5f17 | 2011-11-02 23:59:28 -0400 | [diff] [blame] | 183 | |
| 184 | /* Allocate all page at once, most common usage */ |
| 185 | if (ttm->bdev->driver->ttm_tt_populate(ttm)) { |
| 186 | retval = VM_FAULT_OOM; |
| 187 | goto out_io_unlock; |
| 188 | } |
Thomas Hellstrom | ba4e7d9 | 2009-06-10 15:20:19 +0200 | [diff] [blame] | 189 | } |
| 190 | |
| 191 | /* |
| 192 | * Speculatively prefault a number of pages. Only error on |
| 193 | * first page. |
| 194 | */ |
Thomas Hellstrom | ba4e7d9 | 2009-06-10 15:20:19 +0200 | [diff] [blame] | 195 | for (i = 0; i < TTM_BO_VM_NUM_PREFAULT; ++i) { |
Jerome Glisse | 82c5da6 | 2010-04-09 14:39:23 +0200 | [diff] [blame] | 196 | if (bo->mem.bus.is_iomem) |
| 197 | pfn = ((bo->mem.bus.base + bo->mem.bus.offset) >> PAGE_SHIFT) + page_offset; |
Thomas Hellstrom | ba4e7d9 | 2009-06-10 15:20:19 +0200 | [diff] [blame] | 198 | else { |
Jerome Glisse | b1e5f17 | 2011-11-02 23:59:28 -0400 | [diff] [blame] | 199 | page = ttm->pages[page_offset]; |
Thomas Hellstrom | ba4e7d9 | 2009-06-10 15:20:19 +0200 | [diff] [blame] | 200 | if (unlikely(!page && i == 0)) { |
| 201 | retval = VM_FAULT_OOM; |
Thomas Hellstrom | eba6709 | 2010-11-11 09:41:57 +0100 | [diff] [blame] | 202 | goto out_io_unlock; |
Thomas Hellstrom | ba4e7d9 | 2009-06-10 15:20:19 +0200 | [diff] [blame] | 203 | } else if (unlikely(!page)) { |
| 204 | break; |
| 205 | } |
| 206 | pfn = page_to_pfn(page); |
| 207 | } |
| 208 | |
Thomas Hellstrom | 3943875 | 2013-11-06 09:32:59 -0800 | [diff] [blame^] | 209 | ret = vm_insert_mixed(&cvma, address, pfn); |
Thomas Hellstrom | ba4e7d9 | 2009-06-10 15:20:19 +0200 | [diff] [blame] | 210 | /* |
| 211 | * Somebody beat us to this PTE or prefaulting to |
| 212 | * an already populated PTE, or prefaulting error. |
| 213 | */ |
| 214 | |
| 215 | if (unlikely((ret == -EBUSY) || (ret != 0 && i > 0))) |
| 216 | break; |
| 217 | else if (unlikely(ret != 0)) { |
| 218 | retval = |
| 219 | (ret == -ENOMEM) ? VM_FAULT_OOM : VM_FAULT_SIGBUS; |
Thomas Hellstrom | eba6709 | 2010-11-11 09:41:57 +0100 | [diff] [blame] | 220 | goto out_io_unlock; |
Thomas Hellstrom | ba4e7d9 | 2009-06-10 15:20:19 +0200 | [diff] [blame] | 221 | } |
| 222 | |
| 223 | address += PAGE_SIZE; |
| 224 | if (unlikely(++page_offset >= page_last)) |
| 225 | break; |
| 226 | } |
Thomas Hellstrom | eba6709 | 2010-11-11 09:41:57 +0100 | [diff] [blame] | 227 | out_io_unlock: |
| 228 | ttm_mem_io_unlock(man); |
Thomas Hellstrom | ba4e7d9 | 2009-06-10 15:20:19 +0200 | [diff] [blame] | 229 | out_unlock: |
| 230 | ttm_bo_unreserve(bo); |
| 231 | return retval; |
| 232 | } |
| 233 | |
| 234 | static void ttm_bo_vm_open(struct vm_area_struct *vma) |
| 235 | { |
| 236 | struct ttm_buffer_object *bo = |
| 237 | (struct ttm_buffer_object *)vma->vm_private_data; |
| 238 | |
| 239 | (void)ttm_bo_reference(bo); |
| 240 | } |
| 241 | |
| 242 | static void ttm_bo_vm_close(struct vm_area_struct *vma) |
| 243 | { |
Jerome Glisse | 82c5da6 | 2010-04-09 14:39:23 +0200 | [diff] [blame] | 244 | struct ttm_buffer_object *bo = (struct ttm_buffer_object *)vma->vm_private_data; |
Thomas Hellstrom | ba4e7d9 | 2009-06-10 15:20:19 +0200 | [diff] [blame] | 245 | |
| 246 | ttm_bo_unref(&bo); |
| 247 | vma->vm_private_data = NULL; |
| 248 | } |
| 249 | |
Alexey Dobriyan | f0f37e2 | 2009-09-27 22:29:37 +0400 | [diff] [blame] | 250 | static const struct vm_operations_struct ttm_bo_vm_ops = { |
Thomas Hellstrom | ba4e7d9 | 2009-06-10 15:20:19 +0200 | [diff] [blame] | 251 | .fault = ttm_bo_vm_fault, |
| 252 | .open = ttm_bo_vm_open, |
| 253 | .close = ttm_bo_vm_close |
| 254 | }; |
| 255 | |
David Herrmann | 72525b3 | 2013-07-24 21:08:53 +0200 | [diff] [blame] | 256 | static struct ttm_buffer_object *ttm_bo_vm_lookup(struct ttm_bo_device *bdev, |
| 257 | unsigned long offset, |
| 258 | unsigned long pages) |
| 259 | { |
| 260 | struct drm_vma_offset_node *node; |
| 261 | struct ttm_buffer_object *bo = NULL; |
| 262 | |
| 263 | drm_vma_offset_lock_lookup(&bdev->vma_manager); |
| 264 | |
| 265 | node = drm_vma_offset_lookup_locked(&bdev->vma_manager, offset, pages); |
| 266 | if (likely(node)) { |
| 267 | bo = container_of(node, struct ttm_buffer_object, vma_node); |
| 268 | if (!kref_get_unless_zero(&bo->kref)) |
| 269 | bo = NULL; |
| 270 | } |
| 271 | |
| 272 | drm_vma_offset_unlock_lookup(&bdev->vma_manager); |
| 273 | |
| 274 | if (!bo) |
| 275 | pr_err("Could not find buffer object to map\n"); |
| 276 | |
| 277 | return bo; |
| 278 | } |
| 279 | |
Thomas Hellstrom | ba4e7d9 | 2009-06-10 15:20:19 +0200 | [diff] [blame] | 280 | int ttm_bo_mmap(struct file *filp, struct vm_area_struct *vma, |
| 281 | struct ttm_bo_device *bdev) |
| 282 | { |
| 283 | struct ttm_bo_driver *driver; |
| 284 | struct ttm_buffer_object *bo; |
| 285 | int ret; |
| 286 | |
David Herrmann | 72525b3 | 2013-07-24 21:08:53 +0200 | [diff] [blame] | 287 | bo = ttm_bo_vm_lookup(bdev, vma->vm_pgoff, vma_pages(vma)); |
| 288 | if (unlikely(!bo)) |
Thomas Hellstrom | ba4e7d9 | 2009-06-10 15:20:19 +0200 | [diff] [blame] | 289 | return -EINVAL; |
Thomas Hellstrom | ba4e7d9 | 2009-06-10 15:20:19 +0200 | [diff] [blame] | 290 | |
| 291 | driver = bo->bdev->driver; |
| 292 | if (unlikely(!driver->verify_access)) { |
| 293 | ret = -EPERM; |
| 294 | goto out_unref; |
| 295 | } |
| 296 | ret = driver->verify_access(bo, filp); |
| 297 | if (unlikely(ret != 0)) |
| 298 | goto out_unref; |
| 299 | |
| 300 | vma->vm_ops = &ttm_bo_vm_ops; |
| 301 | |
| 302 | /* |
| 303 | * Note: We're transferring the bo reference to |
| 304 | * vma->vm_private_data here. |
| 305 | */ |
| 306 | |
| 307 | vma->vm_private_data = bo; |
Konstantin Khlebnikov | 314e51b | 2012-10-08 16:29:02 -0700 | [diff] [blame] | 308 | vma->vm_flags |= VM_IO | VM_MIXEDMAP | VM_DONTEXPAND | VM_DONTDUMP; |
Thomas Hellstrom | ba4e7d9 | 2009-06-10 15:20:19 +0200 | [diff] [blame] | 309 | return 0; |
| 310 | out_unref: |
| 311 | ttm_bo_unref(&bo); |
| 312 | return ret; |
| 313 | } |
| 314 | EXPORT_SYMBOL(ttm_bo_mmap); |
| 315 | |
| 316 | int ttm_fbdev_mmap(struct vm_area_struct *vma, struct ttm_buffer_object *bo) |
| 317 | { |
| 318 | if (vma->vm_pgoff != 0) |
| 319 | return -EACCES; |
| 320 | |
| 321 | vma->vm_ops = &ttm_bo_vm_ops; |
| 322 | vma->vm_private_data = ttm_bo_reference(bo); |
Konstantin Khlebnikov | 314e51b | 2012-10-08 16:29:02 -0700 | [diff] [blame] | 323 | vma->vm_flags |= VM_IO | VM_MIXEDMAP | VM_DONTEXPAND; |
Thomas Hellstrom | ba4e7d9 | 2009-06-10 15:20:19 +0200 | [diff] [blame] | 324 | return 0; |
| 325 | } |
| 326 | EXPORT_SYMBOL(ttm_fbdev_mmap); |