/* * Copyright © 2009 Intel Corporation * * 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 * THE AUTHORS OR COPYRIGHT HOLDERS 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. * * Authors: * Chris Wilson * */ /** * @file xf86atomics.h * * Private definitions for atomic operations */ #ifndef LIBDRM_ATOMICS_H #define LIBDRM_ATOMICS_H #ifdef HAVE_CONFIG_H #include "config.h" #endif #if HAVE_LIBDRM_ATOMIC_PRIMITIVES #define HAS_ATOMIC_OPS 1 typedef struct { int atomic; } atomic_t; # define atomic_read(x) ((x)->atomic) # define atomic_set(x, val) ((x)->atomic = (val)) # define atomic_inc(x) ((void) __sync_fetch_and_add (&(x)->atomic, 1)) # define atomic_dec_and_test(x) (__sync_fetch_and_add (&(x)->atomic, -1) == 1) # define atomic_add(x, v) ((void) __sync_add_and_fetch(&(x)->atomic, (v))) # define atomic_dec(x, v) ((void) __sync_sub_and_fetch(&(x)->atomic, (v))) # define atomic_cmpxchg(x, oldv, newv) __sync_val_compare_and_swap (&(x)->atomic, oldv, newv) #endif #if HAVE_LIB_ATOMIC_OPS #include #define HAS_ATOMIC_OPS 1 typedef struct { AO_t atomic; } atomic_t; # define atomic_read(x) AO_load_full(&(x)->atomic) # define atomic_set(x, val) AO_store_full(&(x)->atomic, (val)) # define atomic_inc(x) ((void) AO_fetch_and_add1_full(&(x)->atomic)) # define atomic_add(x, v) ((void) AO_fetch_and_add_full(&(x)->atomic, (v))) # define atomic_dec(x, v) ((void) AO_fetch_and_add_full(&(x)->atomic, -(v))) # define atomic_dec_and_test(x) (AO_fetch_and_sub1_full(&(x)->atomic) == 1) # define atomic_cmpxchg(x, oldv, newv) AO_compare_and_swap_full(&(x)->atomic, oldv, newv) #endif #if defined(__sun) && !defined(HAS_ATOMIC_OPS) /* Solaris & OpenSolaris */ #include #define HAS_ATOMIC_OPS 1 typedef struct { uint_t atomic; } atomic_t; # define atomic_read(x) (int) ((x)->atomic) # define atomic_set(x, val) ((x)->atomic = (uint_t)(val)) # define atomic_inc(x) (atomic_inc_uint (&(x)->atomic)) # define atomic_dec_and_test(x) (atomic_dec_uint_nv(&(x)->atomic) == 1) # define atomic_add(x, v) (atomic_add_int(&(x)->atomic, (v))) # define atomic_dec(x, v) (atomic_add_int(&(x)->atomic, -(v))) # define atomic_cmpxchg(x, oldv, newv) atomic_cas_uint (&(x)->atomic, oldv, newv) #endif #if ! HAS_ATOMIC_OPS #error libdrm requires atomic operations, please define them for your CPU/compiler. #endif #endif >14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 
/* drm_vm.h -- Memory mapping for DRM -*- linux-c -*-
 * Created: Mon Jan  4 08:58:31 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.
 *
 * Authors:
 *    Rickard E. (Rik) Faith <faith@valinux.com>
 *    Gareth Hughes <gareth@valinux.com>
 */

#define __NO_VERSION__
#include "drmP.h"

struct vm_operations_struct   DRM(vm_ops) = {
	nopage:	 DRM(vm_nopage),
	open:	 DRM(vm_open),
	close:	 DRM(vm_close),
};

struct vm_operations_struct   DRM(vm_shm_ops) = {
	nopage:	 DRM(vm_shm_nopage),
	open:	 DRM(vm_open),
	close:	 DRM(vm_shm_close),
};

struct vm_operations_struct   DRM(vm_dma_ops) = {
	nopage:	 DRM(vm_dma_nopage),
	open:	 DRM(vm_open),
	close:	 DRM(vm_close),
};

struct vm_operations_struct   DRM(vm_sg_ops) = {
	nopage:  DRM(vm_sg_nopage),
	open:    DRM(vm_open),
	close:   DRM(vm_close),
};

struct page *DRM(vm_nopage)(struct vm_area_struct *vma,
			    unsigned long address,
			    int write_access)
{
#if __REALLY_HAVE_AGP
	drm_file_t *priv  = vma->vm_file->private_data;
	drm_device_t *dev = priv->dev;
	drm_map_t *map    = NULL;
	drm_map_list_t  *r_list;
	struct list_head *list;

	/*
         * Find the right map
         */

	if(!dev->agp->cant_use_aperture) goto vm_nopage_error;

	list_for_each(list, &dev->maplist->head) {
		r_list = (drm_map_list_t *)list;
		map = r_list->map;
		if (!map) continue;
		if (map->offset == VM_OFFSET(vma)) break;
	}

	if (map && map->type == _DRM_AGP) {
		unsigned long offset = address - vma->vm_start;
		unsigned long baddr = VM_OFFSET(vma) + offset;
		struct drm_agp_mem *agpmem;
		struct page *page;

#if __alpha__
		/*
                 * Adjust to a bus-relative address
                 */
		baddr -= dev->hose->mem_space->start;
#endif

		/*
                 * It's AGP memory - find the real physical page to map
                 */
		for(agpmem = dev->agp->memory; agpmem; agpmem = agpmem->next) {
			if (agpmem->bound <= baddr &&
			    agpmem->bound + agpmem->pages * PAGE_SIZE > baddr) 
				break;
		}

		if (!agpmem) goto vm_nopage_error;

		/*
                 * Get the page, inc the use count, and return it
                 */
		offset = (baddr - agpmem->bound) >> PAGE_SHIFT;
		agpmem->memory->memory[offset] &= dev->agp->page_mask;
		page = virt_to_page(__va(agpmem->memory->memory[offset]));
		get_page(page);

		DRM_DEBUG("baddr = 0x%lx page = 0x%p, offset = 0x%lx\n",
			  baddr, __va(agpmem->memory->memory[offset]), offset);

		return page;
        }
vm_nopage_error:
#endif /* __REALLY_HAVE_AGP */

	return NOPAGE_SIGBUS;		/* Disallow mremap */
}

struct page *DRM(vm_shm_nopage)(struct vm_area_struct *vma,
				unsigned long address,
				int write_access)
{
	drm_map_t	 *map	 = (drm_map_t *)vma->vm_private_data;
	unsigned long	 offset;
	unsigned long	 i;
	struct page	 *page;

	if (address > vma->vm_end) return NOPAGE_SIGBUS; /* Disallow mremap */
	if (!map)    		   return NOPAGE_OOM;  /* Nothing allocated */

	offset	 = address - vma->vm_start;
	i = (unsigned long)map->handle + offset;
	page = vmalloc_to_page((void *)i);
	if (!page)
		return NOPAGE_OOM;
	get_page(page);

	DRM_DEBUG("shm_nopage 0x%lx\n", address);
	return page;
}

/* Special close routine which deletes map information if we are the last
 * person to close a mapping and its not in the global maplist.
 */

void DRM(vm_shm_close)(struct vm_area_struct *vma)
{
	drm_file_t	*priv	= vma->vm_file->private_data;
	drm_device_t	*dev	= priv->dev;
	drm_vma_entry_t *pt, *prev, *next;
	drm_map_t *map;
	drm_map_list_t *r_list;
	struct list_head *list;
	int found_maps = 0;

	DRM_DEBUG("0x%08lx,0x%08lx\n",
		  vma->vm_start, vma->vm_end - vma->vm_start);
	atomic_dec(&dev->vma_count);

	map = vma->vm_private_data;

	down(&dev->struct_sem);
	for (pt = dev->vmalist, prev = NULL; pt; pt = next) {
		next = pt->next;
		if (pt->vma->vm_private_data == map) found_maps++;
		if (pt->vma == vma) {
			if (prev) {
				prev->next = pt->next;
			} else {
				dev->vmalist = pt->next;
			}
			DRM(free)(pt, sizeof(*pt), DRM_MEM_VMAS);
		} else {
			prev = pt;
		}
	}
	/* We were the only map that was found */
	if(found_maps == 1 &&
	   map->flags & _DRM_REMOVABLE) {
		/* Check to see if we are in the maplist, if we are not, then
		 * we delete this mappings information.
		 */
		found_maps = 0;
		list = &dev->maplist->head;
		list_for_each(list, &dev->maplist->head) {
			r_list = (drm_map_list_t *) list;
			if (r_list->map == map) found_maps++;
		}

		if(!found_maps) {
			switch (map->type) {
			case _DRM_REGISTERS:
			case _DRM_FRAME_BUFFER:
#if __REALLY_HAVE_MTRR
				if (map->mtrr >= 0) {
					int retcode;
					retcode = mtrr_del(map->mtrr,
							   map->offset,
							   map->size);
					DRM_DEBUG("mtrr_del = %d\n", retcode);
				}
#endif
				DRM(ioremapfree)(map->handle, map->size);
				break;
			case _DRM_SHM:
				vfree(map->handle);
				break;
			case _DRM_AGP:
			case _DRM_SCATTER_GATHER:
				break;
			}
			DRM(free)(map, sizeof(*map), DRM_MEM_MAPS);
		}
	}
	up(&dev->struct_sem);
}

struct page *DRM(vm_dma_nopage)(struct vm_area_struct *vma,
				unsigned long address,
				int write_access)
{
	drm_file_t	 *priv	 = vma->vm_file->private_data;
	drm_device_t	 *dev	 = priv->dev;
	drm_device_dma_t *dma	 = dev->dma;
	unsigned long	 offset;
	unsigned long	 page_nr;
	struct page	 *page;

	if (!dma)		   return NOPAGE_SIGBUS; /* Error */
	if (address > vma->vm_end) return NOPAGE_SIGBUS; /* Disallow mremap */
	if (!dma->pagelist)	   return NOPAGE_OOM ; /* Nothing allocated */

	offset	 = address - vma->vm_start; /* vm_[pg]off[set] should be 0 */
	page_nr  = offset >> PAGE_SHIFT;
	page = virt_to_page((dma->pagelist[page_nr] + 
			     (offset & (~PAGE_MASK))));

	get_page(page);

	DRM_DEBUG("dma_nopage 0x%lx (page %lu)\n", address, page_nr);
	return page;
}

struct page *DRM(vm_sg_nopage)(struct vm_area_struct *vma,
			       unsigned long address,
			       int write_access)
{
	drm_map_t        *map    = (drm_map_t *)vma->vm_private_data;
	drm_file_t *priv = vma->vm_file->private_data;
	drm_device_t *dev = priv->dev;
	drm_sg_mem_t *entry = dev->sg;
	unsigned long offset;
	unsigned long map_offset;
	unsigned long page_offset;
	struct page *page;

	if (!entry)                return NOPAGE_SIGBUS; /* Error */
	if (address > vma->vm_end) return NOPAGE_SIGBUS; /* Disallow mremap */
	if (!entry->pagelist)      return NOPAGE_OOM ;  /* Nothing allocated */


	offset = address - vma->vm_start;
	map_offset = map->offset - dev->sg->handle;
	page_offset = (offset >> PAGE_SHIFT) + (map_offset >> PAGE_SHIFT);
	page = entry->pagelist[page_offset];
	get_page(page);

	return page;
}

void DRM(vm_open)(struct vm_area_struct *vma)
{
	drm_file_t	*priv	= vma->vm_file->private_data;
	drm_device_t	*dev	= priv->dev;
	drm_vma_entry_t *vma_entry;

	DRM_DEBUG("0x%08lx,0x%08lx\n",
		  vma->vm_start, vma->vm_end - vma->vm_start);
	atomic_inc(&dev->vma_count);

	vma_entry = DRM(alloc)(sizeof(*vma_entry), DRM_MEM_VMAS);
	if (vma_entry) {
		down(&dev->struct_sem);
		vma_entry->vma	= vma;
		vma_entry->next = dev->vmalist;
		vma_entry->pid	= current->pid;
		dev->vmalist	= vma_entry;
		up(&dev->struct_sem);
	}
}

void DRM(vm_close)(struct vm_area_struct *vma)
{
	drm_file_t	*priv	= vma->vm_file->private_data;
	drm_device_t	*dev	= priv->dev;
	drm_vma_entry_t *pt, *prev;

	DRM_DEBUG("0x%08lx,0x%08lx\n",
		  vma->vm_start, vma->vm_end - vma->vm_start);
	atomic_dec(&dev->vma_count);

	down(&dev->struct_sem);
	for (pt = dev->vmalist, prev = NULL; pt; prev = pt, pt = pt->next) {
		if (pt->vma == vma) {
			if (prev) {
				prev->next = pt->next;
			} else {
				dev->vmalist = pt->next;
			}
			DRM(free)(pt, sizeof(*pt), DRM_MEM_VMAS);
			break;
		}
	}
	up(&dev->struct_sem);
}

int DRM(mmap_dma)(struct file *filp, struct vm_area_struct *vma)
{
	drm_file_t	 *priv	 = filp->private_data;
	drm_device_t	 *dev;
	drm_device_dma_t *dma;
	unsigned long	 length	 = vma->vm_end - vma->vm_start;

	lock_kernel();
	dev	 = priv->dev;
	dma	 = dev->dma;
	DRM_DEBUG("start = 0x%lx, end = 0x%lx, offset = 0x%lx\n",
		  vma->vm_start, vma->vm_end, VM_OFFSET(vma));

				/* Length must match exact page count */
	if (!dma || (length >> PAGE_SHIFT) != dma->page_count) {
		unlock_kernel();
		return -EINVAL;
	}
	unlock_kernel();

	vma->vm_ops   = &DRM(vm_dma_ops);

#if LINUX_VERSION_CODE <= 0x020414
	vma->vm_flags |= VM_LOCKED | VM_SHM; /* Don't swap */
#else
	vma->vm_flags |= VM_RESERVED; /* Don't swap */
#endif

	vma->vm_file  =	 filp;	/* Needed for drm_vm_open() */
	DRM(vm_open)(vma);
	return 0;
}

#ifndef DRIVER_GET_MAP_OFS
#define DRIVER_GET_MAP_OFS()	(map->offset)
#endif

#ifndef DRIVER_GET_REG_OFS
#ifdef __alpha__
#define DRIVER_GET_REG_OFS()	(dev->hose->dense_mem_base -	\
				 dev->hose->mem_space->start)
#else
#define DRIVER_GET_REG_OFS()	0
#endif
#endif

int DRM(mmap)(struct file *filp, struct vm_area_struct *vma)
{
	drm_file_t	*priv	= filp->private_data;
	drm_device_t	*dev	= priv->dev;
	drm_map_t	*map	= NULL;
	drm_map_list_t  *r_list;
	unsigned long   offset  = 0;
	struct list_head *list;

	DRM_DEBUG("start = 0x%lx, end = 0x%lx, offset = 0x%lx\n",
		  vma->vm_start, vma->vm_end, VM_OFFSET(vma));

	if ( !priv->authenticated ) return -EACCES;

	if (!VM_OFFSET(vma)) return DRM(mmap_dma)(filp, vma);

				/* A sequential search of a linked list is
				   fine here because: 1) there will only be
				   about 5-10 entries in the list and, 2) a
				   DRI client only has to do this mapping
				   once, so it doesn't have to be optimized
				   for performance, even if the list was a
				   bit longer. */
	list_for_each(list, &dev->maplist->head) {
		unsigned long off;

		r_list = (drm_map_list_t *)list;
		map = r_list->map;
		if (!map) continue;
		off = DRIVER_GET_MAP_OFS();
		if (off == VM_OFFSET(vma)) break;
	}

	if (!map || ((map->flags&_DRM_RESTRICTED) && !capable(CAP_SYS_ADMIN)))
		return -EPERM;

				/* Check for valid size. */
	if (map->size != vma->vm_end - vma->vm_start) return -EINVAL;

	if (!capable(CAP_SYS_ADMIN) && (map->flags & _DRM_READ_ONLY)) {
		vma->vm_flags &= VM_MAYWRITE;
#if defined(__i386__)
		pgprot_val(vma->vm_page_prot) &= ~_PAGE_RW;
#else
				/* Ye gads this is ugly.  With more thought
                                   we could move this up higher and use
                                   `protection_map' instead.  */
		vma->vm_page_prot = __pgprot(pte_val(pte_wrprotect(
			__pte(pgprot_val(vma->vm_page_prot)))));
#endif
	}

	switch (map->type) {
        case _DRM_AGP:
#if defined(__alpha__)
                /*
                 * On Alpha we can't talk to bus dma address from the
                 * CPU, so for memory of type DRM_AGP, we'll deal with
                 * sorting out the real physical pages and mappings
                 * in nopage()
                 */
                vma->vm_ops = &DRM(vm_ops);
                break;
#endif
                /* fall through to _DRM_FRAME_BUFFER... */        
	case _DRM_FRAME_BUFFER:
	case _DRM_REGISTERS:
		if (VM_OFFSET(vma) >= __pa(high_memory)) {
#if defined(__i386__)
			if (boot_cpu_data.x86 > 3 && map->type != _DRM_AGP) {
				pgprot_val(vma->vm_page_prot) |= _PAGE_PCD;
				pgprot_val(vma->vm_page_prot) &= ~_PAGE_PWT;
			}
#elif defined(__ia64__)
			if (map->type != _DRM_AGP)
				vma->vm_page_prot =
					pgprot_writecombine(vma->vm_page_prot);
#elif defined(__powerpc__)
			pgprot_val(vma->vm_page_prot) |= _PAGE_NO_CACHE | _PAGE_GUARDED;
#endif
			vma->vm_flags |= VM_IO;	/* not in core dump */
		}
		offset = DRIVER_GET_REG_OFS();
#ifdef __sparc__
		if (io_remap_page_range(DRM_RPR_ARG(vma) vma->vm_start,
					VM_OFFSET(vma) + offset,
					vma->vm_end - vma->vm_start,
					vma->vm_page_prot, 0))
#else
		if (remap_page_range(DRM_RPR_ARG(vma) vma->vm_start,
				     VM_OFFSET(vma) + offset,
				     vma->vm_end - vma->vm_start,
				     vma->vm_page_prot))
#endif
				return -EAGAIN;
		DRM_DEBUG("   Type = %d; start = 0x%lx, end = 0x%lx,"
			  " offset = 0x%lx\n",
			  map->type,
			  vma->vm_start, vma->vm_end, VM_OFFSET(vma) + offset);
		vma->vm_ops = &DRM(vm_ops);
		break;
	case _DRM_SHM:
		vma->vm_ops = &DRM(vm_shm_ops);
		vma->vm_private_data = (void *)map;
				/* Don't let this area swap.  Change when
				   DRM_KERNEL advisory is supported. */
#if LINUX_VERSION_CODE <= 0x020414
		vma->vm_flags |= VM_LOCKED;
#else
		vma->vm_flags |= VM_RESERVED;
#endif
		break;
	case _DRM_SCATTER_GATHER:
		vma->vm_ops = &DRM(vm_sg_ops);
		vma->vm_private_data = (void *)map;
#if LINUX_VERSION_CODE <= 0x020414
		vma->vm_flags |= VM_LOCKED;
#else
		vma->vm_flags |= VM_RESERVED;
#endif
                break;
	default:
		return -EINVAL;	/* This should never happen. */
	}
#if LINUX_VERSION_CODE <= 0x020414
	vma->vm_flags |= VM_LOCKED | VM_SHM; /* Don't swap */
#else
	vma->vm_flags |= VM_RESERVED; /* Don't swap */
#endif

	vma->vm_file  =	 filp;	/* Needed for drm_vm_open() */
	DRM(vm_open)(vma);
	return 0;
}
generated by cgit v1.2.3 (git 2.25.1) at 2025-11-28 08:15:54 +0000