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/* $OpenBSD: drm_cache.c,v 1.7 2019/04/14 10:14:51 jsg Exp $ */
/*
* Copyright (c) 2017 Mark Kettenis
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <drm/drmP.h>
#if defined(__i386__) || defined(__amd64__)
static void
drm_clflush_page(struct vm_page *page)
{
void *addr;
if (page == NULL)
return;
addr = kmap_atomic(page);
pmap_flush_cache((vaddr_t)addr, PAGE_SIZE);
kunmap_atomic(addr);
}
void
drm_clflush_pages(struct vm_page *pages[], unsigned long num_pages)
{
unsigned long i;
for (i = 0; i < num_pages; i++)
drm_clflush_page(*pages++);
}
void
drm_clflush_sg(struct sg_table *st)
{
struct sg_page_iter sg_iter;
for_each_sg_page(st->sgl, &sg_iter, st->nents, 0)
drm_clflush_page(sg_page_iter_page(&sg_iter));
}
void
drm_clflush_virt_range(void *addr, unsigned long length)
{
pmap_flush_cache((vaddr_t)addr, length);
}
#else
void
drm_clflush_pages(struct vm_page *pages[], unsigned long num_pages)
{
STUB();
}
#endif
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