drm_cache.c revision 1.2.2.1
1 1.2.2.1 tls /* $NetBSD: drm_cache.c,v 1.2.2.1 2014/08/10 06:55:39 tls Exp $ */ 2 1.2 riastrad 3 1.2 riastrad /*- 4 1.2 riastrad * Copyright (c) 2013 The NetBSD Foundation, Inc. 5 1.2 riastrad * All rights reserved. 6 1.2 riastrad * 7 1.2 riastrad * This code is derived from software contributed to The NetBSD Foundation 8 1.2 riastrad * by Taylor R. Campbell. 9 1.2 riastrad * 10 1.2 riastrad * Redistribution and use in source and binary forms, with or without 11 1.2 riastrad * modification, are permitted provided that the following conditions 12 1.2 riastrad * are met: 13 1.2 riastrad * 1. Redistributions of source code must retain the above copyright 14 1.2 riastrad * notice, this list of conditions and the following disclaimer. 15 1.2 riastrad * 2. Redistributions in binary form must reproduce the above copyright 16 1.2 riastrad * notice, this list of conditions and the following disclaimer in the 17 1.2 riastrad * documentation and/or other materials provided with the distribution. 18 1.2 riastrad * 19 1.2 riastrad * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 20 1.2 riastrad * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 21 1.2 riastrad * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 22 1.2 riastrad * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 23 1.2 riastrad * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 24 1.2 riastrad * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 25 1.2 riastrad * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 26 1.2 riastrad * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 27 1.2 riastrad * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 28 1.2 riastrad * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 29 1.2 riastrad * POSSIBILITY OF SUCH DAMAGE. 30 1.2 riastrad */ 31 1.2 riastrad 32 1.2 riastrad #include <sys/cdefs.h> 33 1.2.2.1 tls __KERNEL_RCSID(0, "$NetBSD: drm_cache.c,v 1.2.2.1 2014/08/10 06:55:39 tls Exp $"); 34 1.2 riastrad 35 1.2 riastrad #include <sys/types.h> 36 1.2 riastrad #include <sys/xcall.h> 37 1.2 riastrad 38 1.2 riastrad #include <uvm/uvm_extern.h> 39 1.2 riastrad 40 1.2 riastrad #include <machine/cpufunc.h> 41 1.2 riastrad 42 1.2 riastrad #include <linux/mm_types.h> 43 1.2 riastrad 44 1.2 riastrad #include <drm/drmP.h> 45 1.2 riastrad 46 1.2 riastrad static bool drm_md_clflush_finegrained_p(void); 47 1.2 riastrad static void drm_md_clflush_all(void); 48 1.2 riastrad static void drm_md_clflush_page(struct page *); 49 1.2 riastrad static void drm_md_clflush_virt_range(const void *, size_t); 50 1.2 riastrad 51 1.2 riastrad void 52 1.2.2.1 tls drm_clflush_pages(struct page **pages, unsigned long npages) 53 1.2.2.1 tls { 54 1.2.2.1 tls 55 1.2.2.1 tls if (drm_md_clflush_finegrained_p()) { 56 1.2.2.1 tls while (npages--) 57 1.2.2.1 tls drm_md_clflush_page(pages[npages]); 58 1.2.2.1 tls } else { 59 1.2.2.1 tls drm_md_clflush_all(); 60 1.2.2.1 tls } 61 1.2.2.1 tls } 62 1.2.2.1 tls 63 1.2.2.1 tls void 64 1.2 riastrad drm_clflush_pglist(struct pglist *list) 65 1.2 riastrad { 66 1.2 riastrad 67 1.2 riastrad if (drm_md_clflush_finegrained_p()) { 68 1.2 riastrad struct vm_page *page; 69 1.2 riastrad 70 1.2 riastrad TAILQ_FOREACH(page, list, pageq.queue) 71 1.2 riastrad drm_md_clflush_page(container_of(page, struct page, 72 1.2 riastrad p_vmp)); 73 1.2 riastrad } else { 74 1.2 riastrad drm_md_clflush_all(); 75 1.2 riastrad } 76 1.2 riastrad } 77 1.2 riastrad 78 1.2 riastrad void 79 1.2 riastrad drm_clflush_page(struct page *page) 80 1.2 riastrad { 81 1.2 riastrad 82 1.2 riastrad if (drm_md_clflush_finegrained_p()) 83 1.2 riastrad drm_md_clflush_page(page); 84 1.2 riastrad else 85 1.2 riastrad drm_md_clflush_all(); 86 1.2 riastrad } 87 1.2 riastrad 88 1.2 riastrad void 89 1.2 riastrad drm_clflush_virt_range(const void *vaddr, size_t nbytes) 90 1.2 riastrad { 91 1.2 riastrad 92 1.2 riastrad if (drm_md_clflush_finegrained_p()) 93 1.2 riastrad drm_md_clflush_virt_range(vaddr, nbytes); 94 1.2 riastrad else 95 1.2 riastrad drm_md_clflush_all(); 96 1.2 riastrad } 97 1.2 riastrad 98 1.2 riastrad #if defined(__i386__) || defined(__x86_64__) 99 1.2 riastrad 100 1.2 riastrad static bool 101 1.2 riastrad drm_md_clflush_finegrained_p(void) 102 1.2 riastrad { 103 1.2 riastrad return ISSET(cpu_info_primary.ci_feat_val[0], CPUID_CFLUSH); 104 1.2 riastrad } 105 1.2 riastrad 106 1.2 riastrad static void 107 1.2 riastrad drm_x86_clflush_cpu(void) 108 1.2 riastrad { 109 1.2 riastrad asm volatile ("wbinvd"); 110 1.2 riastrad } 111 1.2 riastrad 112 1.2 riastrad static void 113 1.2 riastrad drm_x86_clflush(const void *vaddr) 114 1.2 riastrad { 115 1.2 riastrad asm volatile ("clflush %0" : : "m" (*(const char *)vaddr)); 116 1.2 riastrad } 117 1.2 riastrad 118 1.2 riastrad static size_t 119 1.2 riastrad drm_x86_clflush_size(void) 120 1.2 riastrad { 121 1.2 riastrad KASSERT(drm_md_clflush_finegrained_p()); 122 1.2 riastrad return cpu_info_primary.ci_cflush_lsize; 123 1.2 riastrad } 124 1.2 riastrad 125 1.2 riastrad static void 126 1.2 riastrad drm_x86_clflush_xc(void *arg0 __unused, void *arg1 __unused) 127 1.2 riastrad { 128 1.2 riastrad drm_x86_clflush_cpu(); 129 1.2 riastrad } 130 1.2 riastrad 131 1.2 riastrad static void 132 1.2 riastrad drm_md_clflush_all(void) 133 1.2 riastrad { 134 1.2 riastrad xc_wait(xc_broadcast(0, &drm_x86_clflush_xc, NULL, NULL)); 135 1.2 riastrad } 136 1.2 riastrad 137 1.2 riastrad static void 138 1.2 riastrad drm_md_clflush_page(struct page *page) 139 1.2 riastrad { 140 1.2 riastrad void *const vaddr = kmap_atomic(page); 141 1.2 riastrad 142 1.2 riastrad drm_md_clflush_virt_range(vaddr, PAGE_SIZE); 143 1.2 riastrad 144 1.2 riastrad kunmap_atomic(vaddr); 145 1.2 riastrad } 146 1.2 riastrad 147 1.2 riastrad static void 148 1.2 riastrad drm_md_clflush_virt_range(const void *vaddr, size_t nbytes) 149 1.2 riastrad 150 1.2 riastrad { 151 1.2 riastrad const char *const start = vaddr, *const end = (start + nbytes); 152 1.2 riastrad const char *p; 153 1.2 riastrad const unsigned int clflush_size = drm_x86_clflush_size(); 154 1.2 riastrad 155 1.2 riastrad KASSERT(drm_md_clflush_finegrained_p()); 156 1.2 riastrad for (p = start; p < end; p += clflush_size) 157 1.2 riastrad drm_x86_clflush(p); 158 1.2 riastrad } 159 1.2 riastrad 160 1.2 riastrad #endif /* defined(__i386__) || defined(__x86_64__) */ 161
Indexes created Thu Oct 02 01:09:59 GMT 2025