156 lines
3.8 KiB
C
156 lines
3.8 KiB
C
/**************************************************************************
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*
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* Copyright (c) 2006-2007 Tungsten Graphics, Inc., Cedar Park, TX., USA
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* All Rights Reserved.
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*
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* Permission is hereby granted, free of charge, to any person obtaining a
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* copy of this software and associated documentation files (the
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* "Software"), to deal in the Software without restriction, including
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* without limitation the rights to use, copy, modify, merge, publish,
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* distribute, sub license, and/or sell copies of the Software, and to
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* permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice (including the
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* next paragraph) shall be included in all copies or substantial portions
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* of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
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* THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
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* DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
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* OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
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* USE OR OTHER DEALINGS IN THE SOFTWARE.
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*
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**************************************************************************/
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/*
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* Authors: Thomas Hellström <thomas-at-tungstengraphics-dot-com>
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*/
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#include <linux/export.h>
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#include <linux/scatterlist.h>
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#include <drm/drmP.h>
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extern int x86_clflush_size;
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static inline void clflush(volatile void *__p)
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{
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asm volatile("clflush %0" : "+m" (*(volatile char*)__p));
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}
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#if 0
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static void
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drm_clflush_page(struct page *page)
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{
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uint8_t *page_virtual;
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unsigned int i;
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const int size = boot_cpu_data.x86_clflush_size;
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if (unlikely(page == NULL))
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return;
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page_virtual = kmap_atomic(page);
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for (i = 0; i < PAGE_SIZE; i += size)
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clflush(page_virtual + i);
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kunmap_atomic(page_virtual);
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}
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static void drm_cache_flush_clflush(struct page *pages[],
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unsigned long num_pages)
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{
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unsigned long i;
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mb();
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for (i = 0; i < num_pages; i++)
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drm_clflush_page(*pages++);
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mb();
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}
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static void
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drm_clflush_ipi_handler(void *null)
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{
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wbinvd();
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}
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#endif
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void
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drm_clflush_pages(struct page *pages[], unsigned long num_pages)
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{
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uint8_t *pva;
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unsigned int i, j;
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pva = AllocKernelSpace(4096);
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if(pva != NULL)
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{
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dma_addr_t *src, *dst;
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u32 count;
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for (i = 0; i < num_pages; i++)
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{
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mb();
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MapPage(pva, page_to_phys(pages[i]), 0x001);
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for (j = 0; j < PAGE_SIZE; j += x86_clflush_size)
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clflush(pva + j);
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}
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FreeKernelSpace(pva);
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}
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mb();
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}
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EXPORT_SYMBOL(drm_clflush_pages);
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void
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drm_clflush_sg(struct sg_table *st)
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{
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struct sg_page_iter sg_iter;
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struct page *page;
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uint8_t *pva;
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unsigned int i;
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pva = AllocKernelSpace(4096);
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if( pva != NULL)
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{
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mb();
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for_each_sg_page(st->sgl, &sg_iter, st->nents, 0)
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{
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page = sg_page_iter_page(&sg_iter);
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MapPage(pva,page_to_phys(page), 0x001);
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for (i = 0; i < PAGE_SIZE; i += x86_clflush_size)
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clflush(pva + i);
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};
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FreeKernelSpace(pva);
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};
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mb();
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}
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EXPORT_SYMBOL(drm_clflush_sg);
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#if 0
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void
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drm_clflush_virt_range(char *addr, unsigned long length)
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{
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#if defined(CONFIG_X86)
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if (cpu_has_clflush) {
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char *end = addr + length;
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mb();
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for (; addr < end; addr += boot_cpu_data.x86_clflush_size)
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clflush(addr);
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clflush(end - 1);
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mb();
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return;
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}
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if (on_each_cpu(drm_clflush_ipi_handler, NULL, 1) != 0)
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printk(KERN_ERR "Timed out waiting for cache flush.\n");
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#else
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printk(KERN_ERR "Architecture has no drm_cache.c support\n");
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WARN_ON_ONCE(1);
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#endif
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}
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EXPORT_SYMBOL(drm_clflush_virt_range);
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#endif
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