drm_cache.c revision 1.3.4.2
1 1.3.4.2 tls /* $NetBSD: drm_cache.c,v 1.3.4.2 2014/08/20 00:04:20 tls Exp $ */ 2 1.3.4.2 tls 3 1.3.4.2 tls /*- 4 1.3.4.2 tls * Copyright (c) 2013 The NetBSD Foundation, Inc. 5 1.3.4.2 tls * All rights reserved. 6 1.3.4.2 tls * 7 1.3.4.2 tls * This code is derived from software contributed to The NetBSD Foundation 8 1.3.4.2 tls * by Taylor R. Campbell. 9 1.3.4.2 tls * 10 1.3.4.2 tls * Redistribution and use in source and binary forms, with or without 11 1.3.4.2 tls * modification, are permitted provided that the following conditions 12 1.3.4.2 tls * are met: 13 1.3.4.2 tls * 1. Redistributions of source code must retain the above copyright 14 1.3.4.2 tls * notice, this list of conditions and the following disclaimer. 15 1.3.4.2 tls * 2. Redistributions in binary form must reproduce the above copyright 16 1.3.4.2 tls * notice, this list of conditions and the following disclaimer in the 17 1.3.4.2 tls * documentation and/or other materials provided with the distribution. 18 1.3.4.2 tls * 19 1.3.4.2 tls * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 1.3.4.2 tls * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 1.3.4.2 tls * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 1.3.4.2 tls * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 1.3.4.2 tls * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 1.3.4.2 tls * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 1.3.4.2 tls * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 1.3.4.2 tls * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 1.3.4.2 tls * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 1.3.4.2 tls * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 1.3.4.2 tls * POSSIBILITY OF SUCH DAMAGE. 30 1.3.4.2 tls */ 31 1.3.4.2 tls 32 1.3.4.2 tls #include <sys/cdefs.h> 33 1.3.4.2 tls __KERNEL_RCSID(0, "$NetBSD: drm_cache.c,v 1.3.4.2 2014/08/20 00:04:20 tls Exp $"); 34 1.3.4.2 tls 35 1.3.4.2 tls #include <sys/types.h> 36 1.3.4.2 tls #include <sys/xcall.h> 37 1.3.4.2 tls 38 1.3.4.2 tls #include <uvm/uvm_extern.h> 39 1.3.4.2 tls 40 1.3.4.2 tls #include <machine/cpufunc.h> 41 1.3.4.2 tls 42 1.3.4.2 tls #include <linux/mm_types.h> 43 1.3.4.2 tls 44 1.3.4.2 tls #include <drm/drmP.h> 45 1.3.4.2 tls 46 1.3.4.2 tls static bool drm_md_clflush_finegrained_p(void); 47 1.3.4.2 tls static void drm_md_clflush_all(void); 48 1.3.4.2 tls static void drm_md_clflush_page(struct page *); 49 1.3.4.2 tls static void drm_md_clflush_virt_range(const void *, size_t); 50 1.3.4.2 tls 51 1.3.4.2 tls void 52 1.3.4.2 tls drm_clflush_pages(struct page **pages, unsigned long npages) 53 1.3.4.2 tls { 54 1.3.4.2 tls 55 1.3.4.2 tls if (drm_md_clflush_finegrained_p()) { 56 1.3.4.2 tls while (npages--) 57 1.3.4.2 tls drm_md_clflush_page(pages[npages]); 58 1.3.4.2 tls } else { 59 1.3.4.2 tls drm_md_clflush_all(); 60 1.3.4.2 tls } 61 1.3.4.2 tls } 62 1.3.4.2 tls 63 1.3.4.2 tls void 64 1.3.4.2 tls drm_clflush_pglist(struct pglist *list) 65 1.3.4.2 tls { 66 1.3.4.2 tls 67 1.3.4.2 tls if (drm_md_clflush_finegrained_p()) { 68 1.3.4.2 tls struct vm_page *page; 69 1.3.4.2 tls 70 1.3.4.2 tls TAILQ_FOREACH(page, list, pageq.queue) 71 1.3.4.2 tls drm_md_clflush_page(container_of(page, struct page, 72 1.3.4.2 tls p_vmp)); 73 1.3.4.2 tls } else { 74 1.3.4.2 tls drm_md_clflush_all(); 75 1.3.4.2 tls } 76 1.3.4.2 tls } 77 1.3.4.2 tls 78 1.3.4.2 tls void 79 1.3.4.2 tls drm_clflush_page(struct page *page) 80 1.3.4.2 tls { 81 1.3.4.2 tls 82 1.3.4.2 tls if (drm_md_clflush_finegrained_p()) 83 1.3.4.2 tls drm_md_clflush_page(page); 84 1.3.4.2 tls else 85 1.3.4.2 tls drm_md_clflush_all(); 86 1.3.4.2 tls } 87 1.3.4.2 tls 88 1.3.4.2 tls void 89 1.3.4.2 tls drm_clflush_virt_range(const void *vaddr, size_t nbytes) 90 1.3.4.2 tls { 91 1.3.4.2 tls 92 1.3.4.2 tls if (drm_md_clflush_finegrained_p()) 93 1.3.4.2 tls drm_md_clflush_virt_range(vaddr, nbytes); 94 1.3.4.2 tls else 95 1.3.4.2 tls drm_md_clflush_all(); 96 1.3.4.2 tls } 97 1.3.4.2 tls 98 1.3.4.2 tls #if defined(__i386__) || defined(__x86_64__) 99 1.3.4.2 tls 100 1.3.4.2 tls static bool 101 1.3.4.2 tls drm_md_clflush_finegrained_p(void) 102 1.3.4.2 tls { 103 1.3.4.2 tls return ISSET(cpu_info_primary.ci_feat_val[0], CPUID_CFLUSH); 104 1.3.4.2 tls } 105 1.3.4.2 tls 106 1.3.4.2 tls static void 107 1.3.4.2 tls drm_x86_clflush_cpu(void) 108 1.3.4.2 tls { 109 1.3.4.2 tls asm volatile ("wbinvd"); 110 1.3.4.2 tls } 111 1.3.4.2 tls 112 1.3.4.2 tls static void 113 1.3.4.2 tls drm_x86_clflush(const void *vaddr) 114 1.3.4.2 tls { 115 1.3.4.2 tls asm volatile ("clflush %0" : : "m" (*(const char *)vaddr)); 116 1.3.4.2 tls } 117 1.3.4.2 tls 118 1.3.4.2 tls static size_t 119 1.3.4.2 tls drm_x86_clflush_size(void) 120 1.3.4.2 tls { 121 1.3.4.2 tls KASSERT(drm_md_clflush_finegrained_p()); 122 1.3.4.2 tls return cpu_info_primary.ci_cflush_lsize; 123 1.3.4.2 tls } 124 1.3.4.2 tls 125 1.3.4.2 tls static void 126 1.3.4.2 tls drm_x86_clflush_xc(void *arg0 __unused, void *arg1 __unused) 127 1.3.4.2 tls { 128 1.3.4.2 tls drm_x86_clflush_cpu(); 129 1.3.4.2 tls } 130 1.3.4.2 tls 131 1.3.4.2 tls static void 132 1.3.4.2 tls drm_md_clflush_all(void) 133 1.3.4.2 tls { 134 1.3.4.2 tls xc_wait(xc_broadcast(0, &drm_x86_clflush_xc, NULL, NULL)); 135 1.3.4.2 tls } 136 1.3.4.2 tls 137 1.3.4.2 tls static void 138 1.3.4.2 tls drm_md_clflush_page(struct page *page) 139 1.3.4.2 tls { 140 1.3.4.2 tls void *const vaddr = kmap_atomic(page); 141 1.3.4.2 tls 142 1.3.4.2 tls drm_md_clflush_virt_range(vaddr, PAGE_SIZE); 143 1.3.4.2 tls 144 1.3.4.2 tls kunmap_atomic(vaddr); 145 1.3.4.2 tls } 146 1.3.4.2 tls 147 1.3.4.2 tls static void 148 1.3.4.2 tls drm_md_clflush_virt_range(const void *vaddr, size_t nbytes) 149 1.3.4.2 tls 150 1.3.4.2 tls { 151 1.3.4.2 tls const char *const start = vaddr, *const end = (start + nbytes); 152 1.3.4.2 tls const char *p; 153 1.3.4.2 tls const unsigned int clflush_size = drm_x86_clflush_size(); 154 1.3.4.2 tls 155 1.3.4.2 tls KASSERT(drm_md_clflush_finegrained_p()); 156 1.3.4.2 tls for (p = start; p < end; p += clflush_size) 157 1.3.4.2 tls drm_x86_clflush(p); 158 1.3.4.2 tls } 159 1.3.4.2 tls 160 1.3.4.2 tls #endif /* defined(__i386__) || defined(__x86_64__) */ 161
Indexes created Thu Oct 02 01:09:59 GMT 2025