Line data    Source code

       1             : /*      $OpenBSD: drm_cache.c,v 1.6 2018/04/25 01:27:46 jsg Exp $       */
       2             : /*
       3             :  * Copyright (c) 2017 Mark Kettenis
       4             :  *
       5             :  * Permission to use, copy, modify, and distribute this software for any
       6             :  * purpose with or without fee is hereby granted, provided that the above
       7             :  * copyright notice and this permission notice appear in all copies.
       8             :  *
       9             :  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
      10             :  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
      11             :  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
      12             :  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
      13             :  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
      14             :  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
      15             :  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
      16             :  */
      17             : 
      18             : #include <dev/pci/drm/drmP.h>
      19             : 
      20             : #if defined(__i386__) || defined(__amd64__)
      21             : static void
      22           0 : drm_clflush_page(struct vm_page *page)
      23             : {
      24             :         void *addr;
      25             : 
      26           0 :         if (page == NULL)
      27           0 :                 return;
      28             : 
      29           0 :         addr = kmap_atomic(page);
      30           0 :         pmap_flush_cache((vaddr_t)addr, PAGE_SIZE);
      31           0 :         kunmap_atomic(addr);
      32           0 : }
      33             : 
      34             : void
      35           0 : drm_clflush_pages(struct vm_page *pages[], unsigned long num_pages)
      36             : {
      37             :         unsigned long i;
      38             : 
      39           0 :         for (i = 0; i < num_pages; i++)
      40           0 :                 drm_clflush_page(*pages++);
      41           0 : }
      42             : 
      43             : void
      44           0 : drm_clflush_sg(struct sg_table *st)
      45             : {
      46           0 :         struct sg_page_iter sg_iter;
      47             : 
      48           0 :         for_each_sg_page(st->sgl, &sg_iter, st->nents, 0)
      49           0 :                 drm_clflush_page(sg_page_iter_page(&sg_iter));
      50           0 : }
      51             : 
      52             : void
      53           0 : drm_clflush_virt_range(void *addr, unsigned long length)
      54             : {
      55           0 :         pmap_flush_cache((vaddr_t)addr, length);
      56           0 : }
      57             : #else
      58             : void
      59             : drm_clflush_pages(struct vm_page *pages[], unsigned long num_pages)
      60             : {
      61             :         STUB();
      62             : }
      63             : #endif