1 /* SPDX-License-Identifier: MIT */ 2 /* 3 * Copyright © 2023 Intel Corporation 4 */ 5 6 #ifndef _XE_ASSERT_H_ 7 #define _XE_ASSERT_H_ 8 9 #include <linux/string_helpers.h> 10 11 #include <drm/drm_print.h> 12 13 #include "xe_device_types.h" 14 #include "xe_step.h" 15 16 /** 17 * DOC: Xe ASSERTs 18 * 19 * While Xe driver aims to be simpler than legacy i915 driver it is still 20 * complex enough that some changes introduced while adding new functionality 21 * could break the existing code. 22 * 23 * Adding &drm_WARN or &drm_err to catch unwanted programming usage could lead 24 * to undesired increased driver footprint and may impact production driver 25 * performance as this additional code will be always present. 26 * 27 * To allow annotate functions with additional detailed debug checks to assert 28 * that all prerequisites are satisfied, without worrying about footprint or 29 * performance penalty on production builds where all potential misuses 30 * introduced during code integration were already fixed, we introduce family 31 * of Xe assert macros that try to follow classic assert() utility: 32 * 33 * * xe_assert() 34 * * xe_tile_assert() 35 * * xe_gt_assert() 36 * 37 * These macros are implemented on top of &drm_WARN, but unlikely to the origin, 38 * warning is triggered when provided condition is false. Additionally all above 39 * assert macros cannot be used in expressions or as a condition, since 40 * underlying code will be compiled out on non-debug builds. 41 * 42 * Note that these macros are not intended for use to cover known gaps in the 43 * implementation; for such cases use regular &drm_WARN or &drm_err and provide 44 * valid safe fallback. 45 * 46 * Also in cases where performance or footprint is not an issue, developers 47 * should continue to use the regular &drm_WARN or &drm_err to ensure that bug 48 * reports from production builds will contain meaningful diagnostics data. 49 * 50 * Below code shows how asserts could help in debug to catch unplanned use:: 51 * 52 * static void one_igfx(struct xe_device *xe) 53 * { 54 * xe_assert(xe, xe->info.is_dgfx == false); 55 * xe_assert(xe, xe->info.tile_count == 1); 56 * } 57 * 58 * static void two_dgfx(struct xe_device *xe) 59 * { 60 * xe_assert(xe, xe->info.is_dgfx); 61 * xe_assert(xe, xe->info.tile_count == 2); 62 * } 63 * 64 * void foo(struct xe_device *xe) 65 * { 66 * if (xe->info.dgfx) 67 * return two_dgfx(xe); 68 * return one_igfx(xe); 69 * } 70 * 71 * void bar(struct xe_device *xe) 72 * { 73 * if (drm_WARN_ON(xe->drm, xe->info.tile_count > 2)) 74 * return; 75 * 76 * if (xe->info.tile_count == 2) 77 * return two_dgfx(xe); 78 * return one_igfx(xe); 79 * } 80 */ 81 82 #if IS_ENABLED(CONFIG_DRM_XE_DEBUG) 83 #define __xe_assert_msg(xe, condition, msg, arg...) ({ \ 84 (void)drm_WARN(&(xe)->drm, !(condition), "[" DRM_NAME "] Assertion `%s` failed!\n" msg, \ 85 __stringify(condition), ## arg); \ 86 }) 87 #else 88 #define __xe_assert_msg(xe, condition, msg, arg...) ({ \ 89 typecheck(const struct xe_device *, xe); \ 90 BUILD_BUG_ON_INVALID(condition); \ 91 }) 92 #endif 93 94 /** 95 * xe_assert - warn if condition is false when debugging. 96 * @xe: the &struct xe_device pointer to which &condition applies 97 * @condition: condition to check 98 * 99 * xe_assert() uses &drm_WARN to emit a warning and print additional information 100 * that could be read from the &xe pointer if provided &condition is false. 101 * 102 * Contrary to &drm_WARN, xe_assert() is effective only on debug builds 103 * (&CONFIG_DRM_XE_DEBUG must be enabled) and cannot be used in expressions 104 * or as a condition. 105 * 106 * See `Xe ASSERTs`_ for general usage guidelines. 107 */ 108 #define xe_assert(xe, condition) xe_assert_msg((xe), condition, "") 109 #define xe_assert_msg(xe, condition, msg, arg...) ({ \ 110 const struct xe_device *__xe = (xe); \ 111 __xe_assert_msg(__xe, condition, \ 112 "platform: %d subplatform: %d\n" \ 113 "graphics: %s %u.%02u step %s\n" \ 114 "media: %s %u.%02u step %s\n" \ 115 msg, \ 116 __xe->info.platform, __xe->info.subplatform, \ 117 __xe->info.graphics_name, \ 118 __xe->info.graphics_verx100 / 100, \ 119 __xe->info.graphics_verx100 % 100, \ 120 xe_step_name(__xe->info.step.graphics), \ 121 __xe->info.media_name, \ 122 __xe->info.media_verx100 / 100, \ 123 __xe->info.media_verx100 % 100, \ 124 xe_step_name(__xe->info.step.media), \ 125 ## arg); \ 126 }) 127 128 /** 129 * xe_tile_assert - warn if condition is false when debugging. 130 * @tile: the &struct xe_tile pointer to which &condition applies 131 * @condition: condition to check 132 * 133 * xe_tile_assert() uses &drm_WARN to emit a warning and print additional 134 * information that could be read from the &tile pointer if provided &condition 135 * is false. 136 * 137 * Contrary to &drm_WARN, xe_tile_assert() is effective only on debug builds 138 * (&CONFIG_DRM_XE_DEBUG must be enabled) and cannot be used in expressions 139 * or as a condition. 140 * 141 * See `Xe ASSERTs`_ for general usage guidelines. 142 */ 143 #define xe_tile_assert(tile, condition) xe_tile_assert_msg((tile), condition, "") 144 #define xe_tile_assert_msg(tile, condition, msg, arg...) ({ \ 145 const struct xe_tile *__tile = (tile); \ 146 char __buf[10] __maybe_unused; \ 147 xe_assert_msg(tile_to_xe(__tile), condition, "tile: %u VRAM %s\n" msg, \ 148 __tile->id, ({ string_get_size(__tile->mem.vram.actual_physical_size, 1, \ 149 STRING_UNITS_2, __buf, sizeof(__buf)); __buf; }), ## arg); \ 150 }) 151 152 /** 153 * xe_gt_assert - warn if condition is false when debugging. 154 * @gt: the &struct xe_gt pointer to which &condition applies 155 * @condition: condition to check 156 * 157 * xe_gt_assert() uses &drm_WARN to emit a warning and print additional 158 * information that could be safetely read from the > pointer if provided 159 * &condition is false. 160 * 161 * Contrary to &drm_WARN, xe_gt_assert() is effective only on debug builds 162 * (&CONFIG_DRM_XE_DEBUG must be enabled) and cannot be used in expressions 163 * or as a condition. 164 * 165 * See `Xe ASSERTs`_ for general usage guidelines. 166 */ 167 #define xe_gt_assert(gt, condition) xe_gt_assert_msg((gt), condition, "") 168 #define xe_gt_assert_msg(gt, condition, msg, arg...) ({ \ 169 const struct xe_gt *__gt = (gt); \ 170 xe_tile_assert_msg(gt_to_tile(__gt), condition, "GT: %u type %d\n" msg, \ 171 __gt->info.id, __gt->info.type, ## arg); \ 172 }) 173 174 #endif 175