110be98a7SChris Wilson /* 210be98a7SChris Wilson * SPDX-License-Identifier: MIT 310be98a7SChris Wilson * 410be98a7SChris Wilson * Copyright © 2017 Intel Corporation 510be98a7SChris Wilson */ 610be98a7SChris Wilson 710be98a7SChris Wilson #include <linux/prime_numbers.h> 810be98a7SChris Wilson 9cb823ed9SChris Wilson #include "gt/intel_gt.h" 107e805762SChris Wilson #include "gt/intel_gt_pm.h" 112871ea85SChris Wilson #include "gt/intel_ring.h" 12cb823ed9SChris Wilson 1310be98a7SChris Wilson #include "i915_selftest.h" 1410be98a7SChris Wilson #include "selftests/i915_random.h" 1510be98a7SChris Wilson 1610be98a7SChris Wilson static int cpu_set(struct drm_i915_gem_object *obj, 1710be98a7SChris Wilson unsigned long offset, 1810be98a7SChris Wilson u32 v) 1910be98a7SChris Wilson { 2010be98a7SChris Wilson unsigned int needs_clflush; 2110be98a7SChris Wilson struct page *page; 2210be98a7SChris Wilson void *map; 2310be98a7SChris Wilson u32 *cpu; 2410be98a7SChris Wilson int err; 2510be98a7SChris Wilson 2610be98a7SChris Wilson err = i915_gem_object_prepare_write(obj, &needs_clflush); 2710be98a7SChris Wilson if (err) 2810be98a7SChris Wilson return err; 2910be98a7SChris Wilson 3010be98a7SChris Wilson page = i915_gem_object_get_page(obj, offset >> PAGE_SHIFT); 3110be98a7SChris Wilson map = kmap_atomic(page); 3210be98a7SChris Wilson cpu = map + offset_in_page(offset); 3310be98a7SChris Wilson 3410be98a7SChris Wilson if (needs_clflush & CLFLUSH_BEFORE) 3510be98a7SChris Wilson drm_clflush_virt_range(cpu, sizeof(*cpu)); 3610be98a7SChris Wilson 3710be98a7SChris Wilson *cpu = v; 3810be98a7SChris Wilson 3910be98a7SChris Wilson if (needs_clflush & CLFLUSH_AFTER) 4010be98a7SChris Wilson drm_clflush_virt_range(cpu, sizeof(*cpu)); 4110be98a7SChris Wilson 4210be98a7SChris Wilson kunmap_atomic(map); 4310be98a7SChris Wilson i915_gem_object_finish_access(obj); 4410be98a7SChris Wilson 4510be98a7SChris Wilson return 0; 4610be98a7SChris Wilson } 4710be98a7SChris Wilson 4810be98a7SChris Wilson static int cpu_get(struct drm_i915_gem_object *obj, 4910be98a7SChris Wilson unsigned long offset, 5010be98a7SChris Wilson u32 *v) 5110be98a7SChris Wilson { 5210be98a7SChris Wilson unsigned int needs_clflush; 5310be98a7SChris Wilson struct page *page; 5410be98a7SChris Wilson void *map; 5510be98a7SChris Wilson u32 *cpu; 5610be98a7SChris Wilson int err; 5710be98a7SChris Wilson 5810be98a7SChris Wilson err = i915_gem_object_prepare_read(obj, &needs_clflush); 5910be98a7SChris Wilson if (err) 6010be98a7SChris Wilson return err; 6110be98a7SChris Wilson 6210be98a7SChris Wilson page = i915_gem_object_get_page(obj, offset >> PAGE_SHIFT); 6310be98a7SChris Wilson map = kmap_atomic(page); 6410be98a7SChris Wilson cpu = map + offset_in_page(offset); 6510be98a7SChris Wilson 6610be98a7SChris Wilson if (needs_clflush & CLFLUSH_BEFORE) 6710be98a7SChris Wilson drm_clflush_virt_range(cpu, sizeof(*cpu)); 6810be98a7SChris Wilson 6910be98a7SChris Wilson *v = *cpu; 7010be98a7SChris Wilson 7110be98a7SChris Wilson kunmap_atomic(map); 7210be98a7SChris Wilson i915_gem_object_finish_access(obj); 7310be98a7SChris Wilson 7410be98a7SChris Wilson return 0; 7510be98a7SChris Wilson } 7610be98a7SChris Wilson 7710be98a7SChris Wilson static int gtt_set(struct drm_i915_gem_object *obj, 7810be98a7SChris Wilson unsigned long offset, 7910be98a7SChris Wilson u32 v) 8010be98a7SChris Wilson { 8110be98a7SChris Wilson struct i915_vma *vma; 8210be98a7SChris Wilson u32 __iomem *map; 837e805762SChris Wilson int err = 0; 8410be98a7SChris Wilson 856951e589SChris Wilson i915_gem_object_lock(obj); 8610be98a7SChris Wilson err = i915_gem_object_set_to_gtt_domain(obj, true); 876951e589SChris Wilson i915_gem_object_unlock(obj); 8810be98a7SChris Wilson if (err) 8910be98a7SChris Wilson return err; 9010be98a7SChris Wilson 9110be98a7SChris Wilson vma = i915_gem_object_ggtt_pin(obj, NULL, 0, 0, PIN_MAPPABLE); 9210be98a7SChris Wilson if (IS_ERR(vma)) 9310be98a7SChris Wilson return PTR_ERR(vma); 9410be98a7SChris Wilson 957e805762SChris Wilson intel_gt_pm_get(vma->vm->gt); 967e805762SChris Wilson 9710be98a7SChris Wilson map = i915_vma_pin_iomap(vma); 9810be98a7SChris Wilson i915_vma_unpin(vma); 997e805762SChris Wilson if (IS_ERR(map)) { 1007e805762SChris Wilson err = PTR_ERR(map); 1017e805762SChris Wilson goto out_rpm; 1027e805762SChris Wilson } 10310be98a7SChris Wilson 10410be98a7SChris Wilson iowrite32(v, &map[offset / sizeof(*map)]); 10510be98a7SChris Wilson i915_vma_unpin_iomap(vma); 10610be98a7SChris Wilson 1077e805762SChris Wilson out_rpm: 1087e805762SChris Wilson intel_gt_pm_put(vma->vm->gt); 1097e805762SChris Wilson return err; 11010be98a7SChris Wilson } 11110be98a7SChris Wilson 11210be98a7SChris Wilson static int gtt_get(struct drm_i915_gem_object *obj, 11310be98a7SChris Wilson unsigned long offset, 11410be98a7SChris Wilson u32 *v) 11510be98a7SChris Wilson { 11610be98a7SChris Wilson struct i915_vma *vma; 11710be98a7SChris Wilson u32 __iomem *map; 1187e805762SChris Wilson int err = 0; 11910be98a7SChris Wilson 1206951e589SChris Wilson i915_gem_object_lock(obj); 12110be98a7SChris Wilson err = i915_gem_object_set_to_gtt_domain(obj, false); 1226951e589SChris Wilson i915_gem_object_unlock(obj); 12310be98a7SChris Wilson if (err) 12410be98a7SChris Wilson return err; 12510be98a7SChris Wilson 12610be98a7SChris Wilson vma = i915_gem_object_ggtt_pin(obj, NULL, 0, 0, PIN_MAPPABLE); 12710be98a7SChris Wilson if (IS_ERR(vma)) 12810be98a7SChris Wilson return PTR_ERR(vma); 12910be98a7SChris Wilson 1307e805762SChris Wilson intel_gt_pm_get(vma->vm->gt); 1317e805762SChris Wilson 13210be98a7SChris Wilson map = i915_vma_pin_iomap(vma); 13310be98a7SChris Wilson i915_vma_unpin(vma); 1347e805762SChris Wilson if (IS_ERR(map)) { 1357e805762SChris Wilson err = PTR_ERR(map); 1367e805762SChris Wilson goto out_rpm; 1377e805762SChris Wilson } 13810be98a7SChris Wilson 13910be98a7SChris Wilson *v = ioread32(&map[offset / sizeof(*map)]); 14010be98a7SChris Wilson i915_vma_unpin_iomap(vma); 14110be98a7SChris Wilson 1427e805762SChris Wilson out_rpm: 1437e805762SChris Wilson intel_gt_pm_put(vma->vm->gt); 1447e805762SChris Wilson return err; 14510be98a7SChris Wilson } 14610be98a7SChris Wilson 14710be98a7SChris Wilson static int wc_set(struct drm_i915_gem_object *obj, 14810be98a7SChris Wilson unsigned long offset, 14910be98a7SChris Wilson u32 v) 15010be98a7SChris Wilson { 15110be98a7SChris Wilson u32 *map; 15210be98a7SChris Wilson int err; 15310be98a7SChris Wilson 1546951e589SChris Wilson i915_gem_object_lock(obj); 15510be98a7SChris Wilson err = i915_gem_object_set_to_wc_domain(obj, true); 1566951e589SChris Wilson i915_gem_object_unlock(obj); 15710be98a7SChris Wilson if (err) 15810be98a7SChris Wilson return err; 15910be98a7SChris Wilson 16010be98a7SChris Wilson map = i915_gem_object_pin_map(obj, I915_MAP_WC); 16110be98a7SChris Wilson if (IS_ERR(map)) 16210be98a7SChris Wilson return PTR_ERR(map); 16310be98a7SChris Wilson 16410be98a7SChris Wilson map[offset / sizeof(*map)] = v; 16510be98a7SChris Wilson i915_gem_object_unpin_map(obj); 16610be98a7SChris Wilson 16710be98a7SChris Wilson return 0; 16810be98a7SChris Wilson } 16910be98a7SChris Wilson 17010be98a7SChris Wilson static int wc_get(struct drm_i915_gem_object *obj, 17110be98a7SChris Wilson unsigned long offset, 17210be98a7SChris Wilson u32 *v) 17310be98a7SChris Wilson { 17410be98a7SChris Wilson u32 *map; 17510be98a7SChris Wilson int err; 17610be98a7SChris Wilson 1776951e589SChris Wilson i915_gem_object_lock(obj); 17810be98a7SChris Wilson err = i915_gem_object_set_to_wc_domain(obj, false); 1796951e589SChris Wilson i915_gem_object_unlock(obj); 18010be98a7SChris Wilson if (err) 18110be98a7SChris Wilson return err; 18210be98a7SChris Wilson 18310be98a7SChris Wilson map = i915_gem_object_pin_map(obj, I915_MAP_WC); 18410be98a7SChris Wilson if (IS_ERR(map)) 18510be98a7SChris Wilson return PTR_ERR(map); 18610be98a7SChris Wilson 18710be98a7SChris Wilson *v = map[offset / sizeof(*map)]; 18810be98a7SChris Wilson i915_gem_object_unpin_map(obj); 18910be98a7SChris Wilson 19010be98a7SChris Wilson return 0; 19110be98a7SChris Wilson } 19210be98a7SChris Wilson 19310be98a7SChris Wilson static int gpu_set(struct drm_i915_gem_object *obj, 19410be98a7SChris Wilson unsigned long offset, 19510be98a7SChris Wilson u32 v) 19610be98a7SChris Wilson { 19710be98a7SChris Wilson struct drm_i915_private *i915 = to_i915(obj->base.dev); 19810be98a7SChris Wilson struct i915_request *rq; 19910be98a7SChris Wilson struct i915_vma *vma; 20010be98a7SChris Wilson u32 *cs; 20110be98a7SChris Wilson int err; 20210be98a7SChris Wilson 2036951e589SChris Wilson i915_gem_object_lock(obj); 20410be98a7SChris Wilson err = i915_gem_object_set_to_gtt_domain(obj, true); 2056951e589SChris Wilson i915_gem_object_unlock(obj); 20610be98a7SChris Wilson if (err) 20710be98a7SChris Wilson return err; 20810be98a7SChris Wilson 20910be98a7SChris Wilson vma = i915_gem_object_ggtt_pin(obj, NULL, 0, 0, 0); 21010be98a7SChris Wilson if (IS_ERR(vma)) 21110be98a7SChris Wilson return PTR_ERR(vma); 21210be98a7SChris Wilson 21310be98a7SChris Wilson rq = i915_request_create(i915->engine[RCS0]->kernel_context); 21410be98a7SChris Wilson if (IS_ERR(rq)) { 21510be98a7SChris Wilson i915_vma_unpin(vma); 21610be98a7SChris Wilson return PTR_ERR(rq); 21710be98a7SChris Wilson } 21810be98a7SChris Wilson 21910be98a7SChris Wilson cs = intel_ring_begin(rq, 4); 22010be98a7SChris Wilson if (IS_ERR(cs)) { 22110be98a7SChris Wilson i915_request_add(rq); 22210be98a7SChris Wilson i915_vma_unpin(vma); 22310be98a7SChris Wilson return PTR_ERR(cs); 22410be98a7SChris Wilson } 22510be98a7SChris Wilson 22610be98a7SChris Wilson if (INTEL_GEN(i915) >= 8) { 22710be98a7SChris Wilson *cs++ = MI_STORE_DWORD_IMM_GEN4 | 1 << 22; 22810be98a7SChris Wilson *cs++ = lower_32_bits(i915_ggtt_offset(vma) + offset); 22910be98a7SChris Wilson *cs++ = upper_32_bits(i915_ggtt_offset(vma) + offset); 23010be98a7SChris Wilson *cs++ = v; 23110be98a7SChris Wilson } else if (INTEL_GEN(i915) >= 4) { 23210be98a7SChris Wilson *cs++ = MI_STORE_DWORD_IMM_GEN4 | MI_USE_GGTT; 23310be98a7SChris Wilson *cs++ = 0; 23410be98a7SChris Wilson *cs++ = i915_ggtt_offset(vma) + offset; 23510be98a7SChris Wilson *cs++ = v; 23610be98a7SChris Wilson } else { 23710be98a7SChris Wilson *cs++ = MI_STORE_DWORD_IMM | MI_MEM_VIRTUAL; 23810be98a7SChris Wilson *cs++ = i915_ggtt_offset(vma) + offset; 23910be98a7SChris Wilson *cs++ = v; 24010be98a7SChris Wilson *cs++ = MI_NOOP; 24110be98a7SChris Wilson } 24210be98a7SChris Wilson intel_ring_advance(rq, cs); 24310be98a7SChris Wilson 2446951e589SChris Wilson i915_vma_lock(vma); 24570d6894dSChris Wilson err = i915_request_await_object(rq, vma->obj, true); 24670d6894dSChris Wilson if (err == 0) 24710be98a7SChris Wilson err = i915_vma_move_to_active(vma, rq, EXEC_OBJECT_WRITE); 2486951e589SChris Wilson i915_vma_unlock(vma); 24910be98a7SChris Wilson i915_vma_unpin(vma); 25010be98a7SChris Wilson 25110be98a7SChris Wilson i915_request_add(rq); 25210be98a7SChris Wilson 25310be98a7SChris Wilson return err; 25410be98a7SChris Wilson } 25510be98a7SChris Wilson 25610be98a7SChris Wilson static bool always_valid(struct drm_i915_private *i915) 25710be98a7SChris Wilson { 25810be98a7SChris Wilson return true; 25910be98a7SChris Wilson } 26010be98a7SChris Wilson 26110be98a7SChris Wilson static bool needs_fence_registers(struct drm_i915_private *i915) 26210be98a7SChris Wilson { 263cb823ed9SChris Wilson return !intel_gt_is_wedged(&i915->gt); 26410be98a7SChris Wilson } 26510be98a7SChris Wilson 26610be98a7SChris Wilson static bool needs_mi_store_dword(struct drm_i915_private *i915) 26710be98a7SChris Wilson { 268cb823ed9SChris Wilson if (intel_gt_is_wedged(&i915->gt)) 26910be98a7SChris Wilson return false; 27010be98a7SChris Wilson 2718f856c74SChris Wilson if (!HAS_ENGINE(i915, RCS0)) 2728f856c74SChris Wilson return false; 2738f856c74SChris Wilson 27410be98a7SChris Wilson return intel_engine_can_store_dword(i915->engine[RCS0]); 27510be98a7SChris Wilson } 27610be98a7SChris Wilson 27710be98a7SChris Wilson static const struct igt_coherency_mode { 27810be98a7SChris Wilson const char *name; 27910be98a7SChris Wilson int (*set)(struct drm_i915_gem_object *, unsigned long offset, u32 v); 28010be98a7SChris Wilson int (*get)(struct drm_i915_gem_object *, unsigned long offset, u32 *v); 28110be98a7SChris Wilson bool (*valid)(struct drm_i915_private *i915); 28210be98a7SChris Wilson } igt_coherency_mode[] = { 28310be98a7SChris Wilson { "cpu", cpu_set, cpu_get, always_valid }, 28410be98a7SChris Wilson { "gtt", gtt_set, gtt_get, needs_fence_registers }, 28510be98a7SChris Wilson { "wc", wc_set, wc_get, always_valid }, 28610be98a7SChris Wilson { "gpu", gpu_set, NULL, needs_mi_store_dword }, 28710be98a7SChris Wilson { }, 28810be98a7SChris Wilson }; 28910be98a7SChris Wilson 29010be98a7SChris Wilson static int igt_gem_coherency(void *arg) 29110be98a7SChris Wilson { 29210be98a7SChris Wilson const unsigned int ncachelines = PAGE_SIZE/64; 29310be98a7SChris Wilson I915_RND_STATE(prng); 29410be98a7SChris Wilson struct drm_i915_private *i915 = arg; 29510be98a7SChris Wilson const struct igt_coherency_mode *read, *write, *over; 29610be98a7SChris Wilson struct drm_i915_gem_object *obj; 29710be98a7SChris Wilson unsigned long count, n; 29810be98a7SChris Wilson u32 *offsets, *values; 29910be98a7SChris Wilson int err = 0; 30010be98a7SChris Wilson 30110be98a7SChris Wilson /* We repeatedly write, overwrite and read from a sequence of 30210be98a7SChris Wilson * cachelines in order to try and detect incoherency (unflushed writes 30310be98a7SChris Wilson * from either the CPU or GPU). Each setter/getter uses our cache 30410be98a7SChris Wilson * domain API which should prevent incoherency. 30510be98a7SChris Wilson */ 30610be98a7SChris Wilson 30710be98a7SChris Wilson offsets = kmalloc_array(ncachelines, 2*sizeof(u32), GFP_KERNEL); 30810be98a7SChris Wilson if (!offsets) 30910be98a7SChris Wilson return -ENOMEM; 31010be98a7SChris Wilson for (count = 0; count < ncachelines; count++) 31110be98a7SChris Wilson offsets[count] = count * 64 + 4 * (count % 16); 31210be98a7SChris Wilson 31310be98a7SChris Wilson values = offsets + ncachelines; 31410be98a7SChris Wilson 31510be98a7SChris Wilson for (over = igt_coherency_mode; over->name; over++) { 31610be98a7SChris Wilson if (!over->set) 31710be98a7SChris Wilson continue; 31810be98a7SChris Wilson 31910be98a7SChris Wilson if (!over->valid(i915)) 32010be98a7SChris Wilson continue; 32110be98a7SChris Wilson 32210be98a7SChris Wilson for (write = igt_coherency_mode; write->name; write++) { 32310be98a7SChris Wilson if (!write->set) 32410be98a7SChris Wilson continue; 32510be98a7SChris Wilson 32610be98a7SChris Wilson if (!write->valid(i915)) 32710be98a7SChris Wilson continue; 32810be98a7SChris Wilson 32910be98a7SChris Wilson for (read = igt_coherency_mode; read->name; read++) { 33010be98a7SChris Wilson if (!read->get) 33110be98a7SChris Wilson continue; 33210be98a7SChris Wilson 33310be98a7SChris Wilson if (!read->valid(i915)) 33410be98a7SChris Wilson continue; 33510be98a7SChris Wilson 33610be98a7SChris Wilson for_each_prime_number_from(count, 1, ncachelines) { 33710be98a7SChris Wilson obj = i915_gem_object_create_internal(i915, PAGE_SIZE); 33810be98a7SChris Wilson if (IS_ERR(obj)) { 33910be98a7SChris Wilson err = PTR_ERR(obj); 3407e805762SChris Wilson goto free; 34110be98a7SChris Wilson } 34210be98a7SChris Wilson 34310be98a7SChris Wilson i915_random_reorder(offsets, ncachelines, &prng); 34410be98a7SChris Wilson for (n = 0; n < count; n++) 34510be98a7SChris Wilson values[n] = prandom_u32_state(&prng); 34610be98a7SChris Wilson 34710be98a7SChris Wilson for (n = 0; n < count; n++) { 34810be98a7SChris Wilson err = over->set(obj, offsets[n], ~values[n]); 34910be98a7SChris Wilson if (err) { 35010be98a7SChris Wilson pr_err("Failed to set stale value[%ld/%ld] in object using %s, err=%d\n", 35110be98a7SChris Wilson n, count, over->name, err); 35210be98a7SChris Wilson goto put_object; 35310be98a7SChris Wilson } 35410be98a7SChris Wilson } 35510be98a7SChris Wilson 35610be98a7SChris Wilson for (n = 0; n < count; n++) { 35710be98a7SChris Wilson err = write->set(obj, offsets[n], values[n]); 35810be98a7SChris Wilson if (err) { 35910be98a7SChris Wilson pr_err("Failed to set value[%ld/%ld] in object using %s, err=%d\n", 36010be98a7SChris Wilson n, count, write->name, err); 36110be98a7SChris Wilson goto put_object; 36210be98a7SChris Wilson } 36310be98a7SChris Wilson } 36410be98a7SChris Wilson 36510be98a7SChris Wilson for (n = 0; n < count; n++) { 36610be98a7SChris Wilson u32 found; 36710be98a7SChris Wilson 36810be98a7SChris Wilson err = read->get(obj, offsets[n], &found); 36910be98a7SChris Wilson if (err) { 37010be98a7SChris Wilson pr_err("Failed to get value[%ld/%ld] in object using %s, err=%d\n", 37110be98a7SChris Wilson n, count, read->name, err); 37210be98a7SChris Wilson goto put_object; 37310be98a7SChris Wilson } 37410be98a7SChris Wilson 37510be98a7SChris Wilson if (found != values[n]) { 37610be98a7SChris Wilson pr_err("Value[%ld/%ld] mismatch, (overwrite with %s) wrote [%s] %x read [%s] %x (inverse %x), at offset %x\n", 37710be98a7SChris Wilson n, count, over->name, 37810be98a7SChris Wilson write->name, values[n], 37910be98a7SChris Wilson read->name, found, 38010be98a7SChris Wilson ~values[n], offsets[n]); 38110be98a7SChris Wilson err = -EINVAL; 38210be98a7SChris Wilson goto put_object; 38310be98a7SChris Wilson } 38410be98a7SChris Wilson } 38510be98a7SChris Wilson 386c017cf6bSChris Wilson i915_gem_object_put(obj); 38710be98a7SChris Wilson } 38810be98a7SChris Wilson } 38910be98a7SChris Wilson } 39010be98a7SChris Wilson } 3917e805762SChris Wilson free: 39210be98a7SChris Wilson kfree(offsets); 39310be98a7SChris Wilson return err; 39410be98a7SChris Wilson 39510be98a7SChris Wilson put_object: 396c017cf6bSChris Wilson i915_gem_object_put(obj); 3977e805762SChris Wilson goto free; 39810be98a7SChris Wilson } 39910be98a7SChris Wilson 40010be98a7SChris Wilson int i915_gem_coherency_live_selftests(struct drm_i915_private *i915) 40110be98a7SChris Wilson { 40210be98a7SChris Wilson static const struct i915_subtest tests[] = { 40310be98a7SChris Wilson SUBTEST(igt_gem_coherency), 40410be98a7SChris Wilson }; 40510be98a7SChris Wilson 40610be98a7SChris Wilson return i915_subtests(tests, i915); 40710be98a7SChris Wilson } 408