diff options
Diffstat (limited to 'drivers/gpu/drm/i915/gt/selftest_timeline.c')
| -rw-r--r-- | drivers/gpu/drm/i915/gt/selftest_timeline.c | 1425 |
1 files changed, 1425 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/gt/selftest_timeline.c b/drivers/gpu/drm/i915/gt/selftest_timeline.c new file mode 100644 index 000000000000..522d0190509c --- /dev/null +++ b/drivers/gpu/drm/i915/gt/selftest_timeline.c @@ -0,0 +1,1425 @@ +// SPDX-License-Identifier: MIT +/* + * Copyright © 2017-2018 Intel Corporation + */ + +#include <linux/prime_numbers.h> +#include <linux/string_helpers.h> + +#include "intel_context.h" +#include "intel_engine_heartbeat.h" +#include "intel_engine_pm.h" +#include "intel_engine_regs.h" +#include "intel_gpu_commands.h" +#include "intel_gt.h" +#include "intel_gt_requests.h" +#include "intel_ring.h" +#include "selftest_engine_heartbeat.h" + +#include "../selftests/i915_random.h" +#include "../i915_selftest.h" + +#include "selftests/igt_flush_test.h" +#include "selftests/lib_sw_fence.h" +#include "selftests/mock_gem_device.h" +#include "selftests/mock_timeline.h" + +static struct page *hwsp_page(struct intel_timeline *tl) +{ + struct drm_i915_gem_object *obj = tl->hwsp_ggtt->obj; + + GEM_BUG_ON(!i915_gem_object_has_pinned_pages(obj)); + return sg_page(obj->mm.pages->sgl); +} + +static unsigned long hwsp_cacheline(struct intel_timeline *tl) +{ + unsigned long address = (unsigned long)page_address(hwsp_page(tl)); + + return (address + offset_in_page(tl->hwsp_offset)) / TIMELINE_SEQNO_BYTES; +} + +static int selftest_tl_pin(struct intel_timeline *tl) +{ + struct i915_gem_ww_ctx ww; + int err; + + i915_gem_ww_ctx_init(&ww, false); +retry: + err = i915_gem_object_lock(tl->hwsp_ggtt->obj, &ww); + if (!err) + err = intel_timeline_pin(tl, &ww); + + if (err == -EDEADLK) { + err = i915_gem_ww_ctx_backoff(&ww); + if (!err) + goto retry; + } + i915_gem_ww_ctx_fini(&ww); + return err; +} + +/* Only half of seqno's are usable, see __intel_timeline_get_seqno() */ +#define CACHELINES_PER_PAGE (PAGE_SIZE / TIMELINE_SEQNO_BYTES / 2) + +struct mock_hwsp_freelist { + struct intel_gt *gt; + struct radix_tree_root cachelines; + struct intel_timeline **history; + unsigned long count, max; + struct rnd_state prng; +}; + +enum { + SHUFFLE = BIT(0), +}; + +static void __mock_hwsp_record(struct mock_hwsp_freelist *state, + unsigned int idx, + struct intel_timeline *tl) +{ + tl = xchg(&state->history[idx], tl); + if (tl) { + radix_tree_delete(&state->cachelines, hwsp_cacheline(tl)); + intel_timeline_unpin(tl); + intel_timeline_put(tl); + } +} + +static int __mock_hwsp_timeline(struct mock_hwsp_freelist *state, + unsigned int count, + unsigned int flags) +{ + struct intel_timeline *tl; + unsigned int idx; + + while (count--) { + unsigned long cacheline; + int err; + + tl = intel_timeline_create(state->gt); + if (IS_ERR(tl)) + return PTR_ERR(tl); + + err = selftest_tl_pin(tl); + if (err) { + intel_timeline_put(tl); + return err; + } + + cacheline = hwsp_cacheline(tl); + err = radix_tree_insert(&state->cachelines, cacheline, tl); + if (err) { + if (err == -EEXIST) { + pr_err("HWSP cacheline %lu already used; duplicate allocation!\n", + cacheline); + } + intel_timeline_unpin(tl); + intel_timeline_put(tl); + return err; + } + + idx = state->count++ % state->max; + __mock_hwsp_record(state, idx, tl); + } + + if (flags & SHUFFLE) + i915_prandom_shuffle(state->history, + sizeof(*state->history), + min(state->count, state->max), + &state->prng); + + count = i915_prandom_u32_max_state(min(state->count, state->max), + &state->prng); + while (count--) { + idx = --state->count % state->max; + __mock_hwsp_record(state, idx, NULL); + } + + return 0; +} + +static int mock_hwsp_freelist(void *arg) +{ + struct mock_hwsp_freelist state; + struct drm_i915_private *i915; + const struct { + const char *name; + unsigned int flags; + } phases[] = { + { "linear", 0 }, + { "shuffled", SHUFFLE }, + { }, + }, *p; + unsigned int na; + int err = 0; + + i915 = mock_gem_device(); + if (!i915) + return -ENOMEM; + + INIT_RADIX_TREE(&state.cachelines, GFP_KERNEL); + state.prng = I915_RND_STATE_INITIALIZER(i915_selftest.random_seed); + + state.gt = to_gt(i915); + + /* + * Create a bunch of timelines and check that their HWSP do not overlap. + * Free some, and try again. + */ + + state.max = PAGE_SIZE / sizeof(*state.history); + state.count = 0; + state.history = kcalloc(state.max, sizeof(*state.history), GFP_KERNEL); + if (!state.history) { + err = -ENOMEM; + goto err_put; + } + + for (p = phases; p->name; p++) { + pr_debug("%s(%s)\n", __func__, p->name); + for_each_prime_number_from(na, 1, 2 * CACHELINES_PER_PAGE) { + err = __mock_hwsp_timeline(&state, na, p->flags); + if (err) + goto out; + } + } + +out: + for (na = 0; na < state.max; na++) + __mock_hwsp_record(&state, na, NULL); + kfree(state.history); +err_put: + mock_destroy_device(i915); + return err; +} + +struct __igt_sync { + const char *name; + u32 seqno; + bool expected; + bool set; +}; + +static int __igt_sync(struct intel_timeline *tl, + u64 ctx, + const struct __igt_sync *p, + const char *name) +{ + int ret; + + if (__intel_timeline_sync_is_later(tl, ctx, p->seqno) != p->expected) { + pr_err("%s: %s(ctx=%llu, seqno=%u) expected passed %s but failed\n", + name, p->name, ctx, p->seqno, str_yes_no(p->expected)); + return -EINVAL; + } + + if (p->set) { + ret = __intel_timeline_sync_set(tl, ctx, p->seqno); + if (ret) + return ret; + } + + return 0; +} + +static int igt_sync(void *arg) +{ + const struct __igt_sync pass[] = { + { "unset", 0, false, false }, + { "new", 0, false, true }, + { "0a", 0, true, true }, + { "1a", 1, false, true }, + { "1b", 1, true, true }, + { "0b", 0, true, false }, + { "2a", 2, false, true }, + { "4", 4, false, true }, + { "INT_MAX", INT_MAX, false, true }, + { "INT_MAX-1", INT_MAX-1, true, false }, + { "INT_MAX+1", (u32)INT_MAX+1, false, true }, + { "INT_MAX", INT_MAX, true, false }, + { "UINT_MAX", UINT_MAX, false, true }, + { "wrap", 0, false, true }, + { "unwrap", UINT_MAX, true, false }, + {}, + }, *p; + struct intel_timeline tl; + int order, offset; + int ret = -ENODEV; + + mock_timeline_init(&tl, 0); + for (p = pass; p->name; p++) { + for (order = 1; order < 64; order++) { + for (offset = -1; offset <= (order > 1); offset++) { + u64 ctx = BIT_ULL(order) + offset; + + ret = __igt_sync(&tl, ctx, p, "1"); + if (ret) + goto out; + } + } + } + mock_timeline_fini(&tl); + + mock_timeline_init(&tl, 0); + for (order = 1; order < 64; order++) { + for (offset = -1; offset <= (order > 1); offset++) { + u64 ctx = BIT_ULL(order) + offset; + + for (p = pass; p->name; p++) { + ret = __igt_sync(&tl, ctx, p, "2"); + if (ret) + goto out; + } + } + } + +out: + mock_timeline_fini(&tl); + return ret; +} + +static unsigned int random_engine(struct rnd_state *rnd) +{ + return i915_prandom_u32_max_state(I915_NUM_ENGINES, rnd); +} + +static int bench_sync(void *arg) +{ + struct rnd_state prng; + struct intel_timeline tl; + unsigned long end_time, count; + u64 prng32_1M; + ktime_t kt; + int order, last_order; + + mock_timeline_init(&tl, 0); + + /* Lookups from cache are very fast and so the random number generation + * and the loop itself becomes a significant factor in the per-iteration + * timings. We try to compensate the results by measuring the overhead + * of the prng and subtract it from the reported results. + */ + prandom_seed_state(&prng, i915_selftest.random_seed); + count = 0; + kt = ktime_get(); + end_time = jiffies + HZ/10; + do { + u32 x; + + /* Make sure the compiler doesn't optimise away the prng call */ + WRITE_ONCE(x, prandom_u32_state(&prng)); + + count++; + } while (!time_after(jiffies, end_time)); + kt = ktime_sub(ktime_get(), kt); + pr_debug("%s: %lu random evaluations, %lluns/prng\n", + __func__, count, (long long)div64_ul(ktime_to_ns(kt), count)); + prng32_1M = div64_ul(ktime_to_ns(kt) << 20, count); + + /* Benchmark (only) setting random context ids */ + prandom_seed_state(&prng, i915_selftest.random_seed); + count = 0; + kt = ktime_get(); + end_time = jiffies + HZ/10; + do { + u64 id = i915_prandom_u64_state(&prng); + + __intel_timeline_sync_set(&tl, id, 0); + count++; + } while (!time_after(jiffies, end_time)); + kt = ktime_sub(ktime_get(), kt); + kt = ktime_sub_ns(kt, (count * prng32_1M * 2) >> 20); + pr_info("%s: %lu random insertions, %lluns/insert\n", + __func__, count, (long long)div64_ul(ktime_to_ns(kt), count)); + + /* Benchmark looking up the exact same context ids as we just set */ + prandom_seed_state(&prng, i915_selftest.random_seed); + end_time = count; + kt = ktime_get(); + while (end_time--) { + u64 id = i915_prandom_u64_state(&prng); + + if (!__intel_timeline_sync_is_later(&tl, id, 0)) { + mock_timeline_fini(&tl); + pr_err("Lookup of %llu failed\n", id); + return -EINVAL; + } + } + kt = ktime_sub(ktime_get(), kt); + kt = ktime_sub_ns(kt, (count * prng32_1M * 2) >> 20); + pr_info("%s: %lu random lookups, %lluns/lookup\n", + __func__, count, (long long)div64_ul(ktime_to_ns(kt), count)); + + mock_timeline_fini(&tl); + cond_resched(); + + mock_timeline_init(&tl, 0); + + /* Benchmark setting the first N (in order) contexts */ + count = 0; + kt = ktime_get(); + end_time = jiffies + HZ/10; + do { + __intel_timeline_sync_set(&tl, count++, 0); + } while (!time_after(jiffies, end_time)); + kt = ktime_sub(ktime_get(), kt); + pr_info("%s: %lu in-order insertions, %lluns/insert\n", + __func__, count, (long long)div64_ul(ktime_to_ns(kt), count)); + + /* Benchmark looking up the exact same context ids as we just set */ + end_time = count; + kt = ktime_get(); + while (end_time--) { + if (!__intel_timeline_sync_is_later(&tl, end_time, 0)) { + pr_err("Lookup of %lu failed\n", end_time); + mock_timeline_fini(&tl); + return -EINVAL; + } + } + kt = ktime_sub(ktime_get(), kt); + pr_info("%s: %lu in-order lookups, %lluns/lookup\n", + __func__, count, (long long)div64_ul(ktime_to_ns(kt), count)); + + mock_timeline_fini(&tl); + cond_resched(); + + mock_timeline_init(&tl, 0); + + /* Benchmark searching for a random context id and maybe changing it */ + prandom_seed_state(&prng, i915_selftest.random_seed); + count = 0; + kt = ktime_get(); + end_time = jiffies + HZ/10; + do { + u32 id = random_engine(&prng); + u32 seqno = prandom_u32_state(&prng); + + if (!__intel_timeline_sync_is_later(&tl, id, seqno)) + __intel_timeline_sync_set(&tl, id, seqno); + + count++; + } while (!time_after(jiffies, end_time)); + kt = ktime_sub(ktime_get(), kt); + kt = ktime_sub_ns(kt, (count * prng32_1M * 2) >> 20); + pr_info("%s: %lu repeated insert/lookups, %lluns/op\n", + __func__, count, (long long)div64_ul(ktime_to_ns(kt), count)); + mock_timeline_fini(&tl); + cond_resched(); + + /* Benchmark searching for a known context id and changing the seqno */ + for (last_order = 1, order = 1; order < 32; + ({ int tmp = last_order; last_order = order; order += tmp; })) { + unsigned int mask = BIT(order) - 1; + + mock_timeline_init(&tl, 0); + + count = 0; + kt = ktime_get(); + end_time = jiffies + HZ/10; + do { + /* Without assuming too many details of the underlying + * implementation, try to identify its phase-changes + * (if any)! + */ + u64 id = (u64)(count & mask) << order; + + __intel_timeline_sync_is_later(&tl, id, 0); + __intel_timeline_sync_set(&tl, id, 0); + + count++; + } while (!time_after(jiffies, end_time)); + kt = ktime_sub(ktime_get(), kt); + pr_info("%s: %lu cyclic/%d insert/lookups, %lluns/op\n", + __func__, count, order, + (long long)div64_ul(ktime_to_ns(kt), count)); + mock_timeline_fini(&tl); + cond_resched(); + } + + return 0; +} + +int intel_timeline_mock_selftests(void) +{ + static const struct i915_subtest tests[] = { + SUBTEST(mock_hwsp_freelist), + SUBTEST(igt_sync), + SUBTEST(bench_sync), + }; + + return i915_subtests(tests, NULL); +} + +static int emit_ggtt_store_dw(struct i915_request *rq, u32 addr, u32 value) +{ + u32 *cs; + + cs = intel_ring_begin(rq, 4); + if (IS_ERR(cs)) + return PTR_ERR(cs); + + if (GRAPHICS_VER(rq->engine->i915) >= 8) { + *cs++ = MI_STORE_DWORD_IMM_GEN4 | MI_USE_GGTT; + *cs++ = addr; + *cs++ = 0; + *cs++ = value; + } else if (GRAPHICS_VER(rq->engine->i915) >= 4) { + *cs++ = MI_STORE_DWORD_IMM_GEN4 | MI_USE_GGTT; + *cs++ = 0; + *cs++ = addr; + *cs++ = value; + } else { + *cs++ = MI_STORE_DWORD_IMM | MI_MEM_VIRTUAL; + *cs++ = addr; + *cs++ = value; + *cs++ = MI_NOOP; + } + + intel_ring_advance(rq, cs); + + return 0; +} + +static struct i915_request * +checked_tl_write(struct intel_timeline *tl, struct intel_engine_cs *engine, u32 value) +{ + struct i915_request *rq; + int err; + + err = selftest_tl_pin(tl); + if (err) { + rq = ERR_PTR(err); + goto out; + } + + if (READ_ONCE(*tl->hwsp_seqno) != tl->seqno) { + pr_err("Timeline created with incorrect breadcrumb, found %x, expected %x\n", + *tl->hwsp_seqno, tl->seqno); + intel_timeline_unpin(tl); + return ERR_PTR(-EINVAL); + } + + rq = intel_engine_create_kernel_request(engine); + if (IS_ERR(rq)) + goto out_unpin; + + i915_request_get(rq); + + err = emit_ggtt_store_dw(rq, tl->hwsp_offset, value); + i915_request_add(rq); + if (err) { + i915_request_put(rq); + rq = ERR_PTR(err); + } + +out_unpin: + intel_timeline_unpin(tl); +out: + if (IS_ERR(rq)) + pr_err("Failed to write to timeline!\n"); + return rq; +} + +static int live_hwsp_engine(void *arg) +{ +#define NUM_TIMELINES 4096 + struct intel_gt *gt = arg; + struct intel_timeline **timelines; + struct intel_engine_cs *engine; + enum intel_engine_id id; + unsigned long count, n; + int err = 0; + + /* + * Create a bunch of timelines and check we can write + * independently to each of their breadcrumb slots. + */ + + timelines = kvmalloc_array(NUM_TIMELINES * I915_NUM_ENGINES, + sizeof(*timelines), + GFP_KERNEL); + if (!timelines) + return -ENOMEM; + + count = 0; + for_each_engine(engine, gt, id) { + if (!intel_engine_can_store_dword(engine)) + continue; + + intel_engine_pm_get(engine); + + for (n = 0; n < NUM_TIMELINES; n++) { + struct intel_timeline *tl; + struct i915_request *rq; + + tl = intel_timeline_create(gt); + if (IS_ERR(tl)) { + err = PTR_ERR(tl); + break; + } + + rq = checked_tl_write(tl, engine, count); + if (IS_ERR(rq)) { + intel_timeline_put(tl); + err = PTR_ERR(rq); + break; + } + + timelines[count++] = tl; + i915_request_put(rq); + } + + intel_engine_pm_put(engine); + if (err) + break; + } + + if (igt_flush_test(gt->i915)) + err = -EIO; + + for (n = 0; n < count; n++) { + struct intel_timeline *tl = timelines[n]; + + if (!err && READ_ONCE(*tl->hwsp_seqno) != n) { + GEM_TRACE_ERR("Invalid seqno:%lu stored in timeline %llu @ %x, found 0x%x\n", + n, tl->fence_context, tl->hwsp_offset, *tl->hwsp_seqno); + GEM_TRACE_DUMP(); + err = -EINVAL; + } + intel_timeline_put(tl); + } + + kvfree(timelines); + return err; +#undef NUM_TIMELINES +} + +static int live_hwsp_alternate(void *arg) +{ +#define NUM_TIMELINES 4096 + struct intel_gt *gt = arg; + struct intel_timeline **timelines; + struct intel_engine_cs *engine; + enum intel_engine_id id; + unsigned long count, n; + int err = 0; + + /* + * Create a bunch of timelines and check we can write + * independently to each of their breadcrumb slots with adjacent + * engines. + */ + + timelines = kvmalloc_array(NUM_TIMELINES * I915_NUM_ENGINES, + sizeof(*timelines), + GFP_KERNEL); + if (!timelines) + return -ENOMEM; + + count = 0; + for (n = 0; n < NUM_TIMELINES; n++) { + for_each_engine(engine, gt, id) { + struct intel_timeline *tl; + struct i915_request *rq; + + if (!intel_engine_can_store_dword(engine)) + continue; + + tl = intel_timeline_create(gt); + if (IS_ERR(tl)) { + err = PTR_ERR(tl); + goto out; + } + + intel_engine_pm_get(engine); + rq = checked_tl_write(tl, engine, count); + intel_engine_pm_put(engine); + if (IS_ERR(rq)) { + intel_timeline_put(tl); + err = PTR_ERR(rq); + goto out; + } + + timelines[count++] = tl; + i915_request_put(rq); + } + } + +out: + if (igt_flush_test(gt->i915)) + err = -EIO; + + for (n = 0; n < count; n++) { + struct intel_timeline *tl = timelines[n]; + + if (!err && READ_ONCE(*tl->hwsp_seqno) != n) { + GEM_TRACE_ERR("Invalid seqno:%lu stored in timeline %llu @ %x, found 0x%x\n", + n, tl->fence_context, tl->hwsp_offset, *tl->hwsp_seqno); + GEM_TRACE_DUMP(); + err = -EINVAL; + } + intel_timeline_put(tl); + } + + kvfree(timelines); + return err; +#undef NUM_TIMELINES +} + +static int live_hwsp_wrap(void *arg) +{ + struct intel_gt *gt = arg; + struct intel_engine_cs *engine; + struct intel_timeline *tl; + enum intel_engine_id id; + int err = 0; + + /* + * Across a seqno wrap, we need to keep the old cacheline alive for + * foreign GPU references. + */ + + tl = intel_timeline_create(gt); + if (IS_ERR(tl)) + return PTR_ERR(tl); + + if (!tl->has_initial_breadcrumb) + goto out_free; + + err = selftest_tl_pin(tl); + if (err) + goto out_free; + + for_each_engine(engine, gt, id) { + const u32 *hwsp_seqno[2]; + struct i915_request *rq; + u32 seqno[2]; + + if (!intel_engine_can_store_dword(engine)) + continue; + + rq = intel_engine_create_kernel_request(engine); + if (IS_ERR(rq)) { + err = PTR_ERR(rq); + goto out; + } + + tl->seqno = -4u; + + mutex_lock_nested(&tl->mutex, SINGLE_DEPTH_NESTING); + err = intel_timeline_get_seqno(tl, rq, &seqno[0]); + mutex_unlock(&tl->mutex); + if (err) { + i915_request_add(rq); + goto out; + } + pr_debug("seqno[0]:%08x, hwsp_offset:%08x\n", + seqno[0], tl->hwsp_offset); + + err = emit_ggtt_store_dw(rq, tl->hwsp_offset, seqno[0]); + if (err) { + i915_request_add(rq); + goto out; + } + hwsp_seqno[0] = tl->hwsp_seqno; + + mutex_lock_nested(&tl->mutex, SINGLE_DEPTH_NESTING); + err = intel_timeline_get_seqno(tl, rq, &seqno[1]); + mutex_unlock(&tl->mutex); + if (err) { + i915_request_add(rq); + goto out; + } + pr_debug("seqno[1]:%08x, hwsp_offset:%08x\n", + seqno[1], tl->hwsp_offset); + + err = emit_ggtt_store_dw(rq, tl->hwsp_offset, seqno[1]); + if (err) { + i915_request_add(rq); + goto out; + } + hwsp_seqno[1] = tl->hwsp_seqno; + + /* With wrap should come a new hwsp */ + GEM_BUG_ON(seqno[1] >= seqno[0]); + GEM_BUG_ON(hwsp_seqno[0] == hwsp_seqno[1]); + + i915_request_add(rq); + + if (i915_request_wait(rq, 0, HZ / 5) < 0) { + pr_err("Wait for timeline writes timed out!\n"); + err = -EIO; + goto out; + } + + if (READ_ONCE(*hwsp_seqno[0]) != seqno[0] || + READ_ONCE(*hwsp_seqno[1]) != seqno[1]) { + pr_err("Bad timeline values: found (%x, %x), expected (%x, %x)\n", + *hwsp_seqno[0], *hwsp_seqno[1], + seqno[0], seqno[1]); + err = -EINVAL; + goto out; + } + + intel_gt_retire_requests(gt); /* recycle HWSP */ + } + +out: + if (igt_flush_test(gt->i915)) + err = -EIO; + + intel_timeline_unpin(tl); +out_free: + intel_timeline_put(tl); + return err; +} + +static int emit_read_hwsp(struct i915_request *rq, + u32 seqno, u32 hwsp, + u32 *addr) +{ + const u32 gpr = i915_mmio_reg_offset(GEN8_RING_CS_GPR(rq->engine->mmio_base, 0)); + u32 *cs; + + cs = intel_ring_begin(rq, 12); + if (IS_ERR(cs)) + return PTR_ERR(cs); + + *cs++ = MI_STORE_DWORD_IMM_GEN4 | MI_USE_GGTT; + *cs++ = *addr; + *cs++ = 0; + *cs++ = seqno; + *addr += 4; + + *cs++ = MI_LOAD_REGISTER_MEM_GEN8 | MI_USE_GGTT; + *cs++ = gpr; + *cs++ = hwsp; + *cs++ = 0; + + *cs++ = MI_STORE_REGISTER_MEM_GEN8 | MI_USE_GGTT; + *cs++ = gpr; + *cs++ = *addr; + *cs++ = 0; + *addr += 4; + + intel_ring_advance(rq, cs); + + return 0; +} + +struct hwsp_watcher { + struct i915_vma *vma; + struct i915_request *rq; + u32 addr; + u32 *map; +}; + +static bool cmp_lt(u32 a, u32 b) +{ + return a < b; +} + +static bool cmp_gte(u32 a, u32 b) +{ + return a >= b; +} + +static int setup_watcher(struct hwsp_watcher *w, struct intel_gt *gt) +{ + struct drm_i915_gem_object *obj; + struct i915_vma *vma; + + obj = i915_gem_object_create_internal(gt->i915, SZ_2M); + if (IS_ERR(obj)) + return PTR_ERR(obj); + + w->map = i915_gem_object_pin_map_unlocked(obj, I915_MAP_WB); + if (IS_ERR(w->map)) { + i915_gem_object_put(obj); + return PTR_ERR(w->map); + } + + vma = i915_gem_object_ggtt_pin(obj, NULL, 0, 0, 0); + if (IS_ERR(vma)) { + i915_gem_object_put(obj); + return PTR_ERR(vma); + } + + w->vma = vma; + w->addr = i915_ggtt_offset(vma); + return 0; +} + +static void switch_tl_lock(struct i915_request *from, struct i915_request *to) +{ + /* some light mutex juggling required; think co-routines */ + + if (from) { + lockdep_unpin_lock(&from->context->timeline->mutex, from->cookie); + mutex_unlock(&from->context->timeline->mutex); + } + + if (to) { + mutex_lock(&to->context->timeline->mutex); + to->cookie = lockdep_pin_lock(&to->context->timeline->mutex); + } +} + +static int create_watcher(struct hwsp_watcher *w, + struct intel_engine_cs *engine, + int ringsz) +{ + struct intel_context *ce; + + ce = intel_context_create(engine); + if (IS_ERR(ce)) + return PTR_ERR(ce); + + ce->ring_size = ringsz; + w->rq = intel_context_create_request(ce); + intel_context_put(ce); + if (IS_ERR(w->rq)) + return PTR_ERR(w->rq); + + w->addr = i915_ggtt_offset(w->vma); + + switch_tl_lock(w->rq, NULL); + + return 0; +} + +static int check_watcher(struct hwsp_watcher *w, const char *name, + bool (*op)(u32 hwsp, u32 seqno)) +{ + struct i915_request *rq = fetch_and_zero(&w->rq); + u32 offset, end; + int err; + + GEM_BUG_ON(w->addr - i915_ggtt_offset(w->vma) > w->vma->size); + + i915_request_get(rq); + switch_tl_lock(NULL, rq); + i915_request_add(rq); + + if (i915_request_wait(rq, 0, HZ) < 0) { + err = -ETIME; + goto out; + } + + err = 0; + offset = 0; + end = (w->addr - i915_ggtt_offset(w->vma)) / sizeof(*w->map); + while (offset < end) { + if (!op(w->map[offset + 1], w->map[offset])) { + pr_err("Watcher '%s' found HWSP value %x for seqno %x\n", + name, w->map[offset + 1], w->map[offset]); + err = -EINVAL; + } + + offset += 2; + } + +out: + i915_request_put(rq); + return err; +} + +static void cleanup_watcher(struct hwsp_watcher *w) +{ + if (w->rq) { + switch_tl_lock(NULL, w->rq); + + i915_request_add(w->rq); + } + + i915_vma_unpin_and_release(&w->vma, I915_VMA_RELEASE_MAP); +} + +static bool retire_requests(struct intel_timeline *tl) +{ + struct i915_request *rq, *rn; + + mutex_lock(&tl->mutex); + list_for_each_entry_safe(rq, rn, &tl->requests, link) + if (!i915_request_retire(rq)) + break; + mutex_unlock(&tl->mutex); + + return !i915_active_fence_isset(&tl->last_request); +} + +static struct i915_request *wrap_timeline(struct i915_request *rq) +{ + struct intel_context *ce = rq->context; + struct intel_timeline *tl = ce->timeline; + u32 seqno = rq->fence.seqno; + + while (tl->seqno >= seqno) { /* Cause a wrap */ + i915_request_put(rq); + rq = intel_context_create_request(ce); + if (IS_ERR(rq)) + return rq; + + i915_request_get(rq); + i915_request_add(rq); + } + + i915_request_put(rq); + rq = i915_request_create(ce); + if (IS_ERR(rq)) + return rq; + + i915_request_get(rq); + i915_request_add(rq); + + return rq; +} + +static int live_hwsp_read(void *arg) +{ + struct intel_gt *gt = arg; + struct hwsp_watcher watcher[2] = {}; + struct intel_engine_cs *engine; + struct intel_timeline *tl; + enum intel_engine_id id; + int err = 0; + int i; + + /* + * If we take a reference to the HWSP for reading on the GPU, that + * read may be arbitrarily delayed (either by foreign fence or + * priority saturation) and a wrap can happen within 30 minutes. + * When the GPU read is finally submitted it should be correct, + * even across multiple wraps. + */ + + if (GRAPHICS_VER(gt->i915) < 8) /* CS convenience [SRM/LRM] */ + return 0; + + tl = intel_timeline_create(gt); + if (IS_ERR(tl)) + return PTR_ERR(tl); + + if (!tl->has_initial_breadcrumb) + goto out_free; + + for (i = 0; i < ARRAY_SIZE(watcher); i++) { + err = setup_watcher(&watcher[i], gt); + if (err) + goto out; + } + + for_each_engine(engine, gt, id) { + struct intel_context *ce; + unsigned long count = 0; + IGT_TIMEOUT(end_time); + + /* Create a request we can use for remote reading of the HWSP */ + err = create_watcher(&watcher[1], engine, SZ_512K); + if (err) + goto out; + + do { + struct i915_sw_fence *submit; + struct i915_request *rq; + u32 hwsp, dummy; + + submit = heap_fence_create(GFP_KERNEL); + if (!submit) { + err = -ENOMEM; + goto out; + } + + err = create_watcher(&watcher[0], engine, SZ_4K); + if (err) + goto out; + + ce = intel_context_create(engine); + if (IS_ERR(ce)) { + err = PTR_ERR(ce); + goto out; + } + + ce->timeline = intel_timeline_get(tl); + + /* Ensure timeline is mapped, done during first pin */ + err = intel_context_pin(ce); + if (err) { + intel_context_put(ce); + goto out; + } + + /* + * Start at a new wrap, and set seqno right before another wrap, + * saving 30 minutes of nops + */ + tl->seqno = -12u + 2 * (count & 3); + __intel_timeline_get_seqno(tl, &dummy); + + rq = i915_request_create(ce); + if (IS_ERR(rq)) { + err = PTR_ERR(rq); + intel_context_unpin(ce); + intel_context_put(ce); + goto out; + } + + err = i915_sw_fence_await_dma_fence(&rq->submit, + &watcher[0].rq->fence, 0, + GFP_KERNEL); + if (err < 0) { + i915_request_add(rq); + intel_context_unpin(ce); + intel_context_put(ce); + goto out; + } + + switch_tl_lock(rq, watcher[0].rq); + err = intel_timeline_read_hwsp(rq, watcher[0].rq, &hwsp); + if (err == 0) + err = emit_read_hwsp(watcher[0].rq, /* before */ + rq->fence.seqno, hwsp, + &watcher[0].addr); + switch_tl_lock(watcher[0].rq, rq); + if (err) { + i915_request_add(rq); + intel_context_unpin(ce); + intel_context_put(ce); + goto out; + } + + switch_tl_lock(rq, watcher[1].rq); + err = intel_timeline_read_hwsp(rq, watcher[1].rq, &hwsp); + if (err == 0) + err = emit_read_hwsp(watcher[1].rq, /* after */ + rq->fence.seqno, hwsp, + &watcher[1].addr); + switch_tl_lock(watcher[1].rq, rq); + if (err) { + i915_request_add(rq); + intel_context_unpin(ce); + intel_context_put(ce); + goto out; + } + + i915_request_get(rq); + i915_request_add(rq); + + rq = wrap_timeline(rq); + intel_context_unpin(ce); + intel_context_put(ce); + if (IS_ERR(rq)) { + err = PTR_ERR(rq); + goto out; + } + + err = i915_sw_fence_await_dma_fence(&watcher[1].rq->submit, + &rq->fence, 0, + GFP_KERNEL); + if (err < 0) { + i915_request_put(rq); + goto out; + } + + err = check_watcher(&watcher[0], "before", cmp_lt); + i915_sw_fence_commit(submit); + heap_fence_put(submit); + if (err) { + i915_request_put(rq); + goto out; + } + count++; + + /* Flush the timeline before manually wrapping again */ + if (i915_request_wait(rq, + I915_WAIT_INTERRUPTIBLE, + HZ) < 0) { + err = -ETIME; + i915_request_put(rq); + goto out; + } + retire_requests(tl); + i915_request_put(rq); + + /* Single requests are limited to half a ring at most */ + if (8 * watcher[1].rq->ring->emit > + 3 * watcher[1].rq->ring->size) + break; + + } while (!__igt_timeout(end_time, NULL) && + count < (PAGE_SIZE / TIMELINE_SEQNO_BYTES - 1) / 2); + + pr_info("%s: simulated %lu wraps\n", engine->name, count); + err = check_watcher(&watcher[1], "after", cmp_gte); + if (err) + goto out; + } + +out: + for (i = 0; i < ARRAY_SIZE(watcher); i++) + cleanup_watcher(&watcher[i]); + + if (igt_flush_test(gt->i915)) + err = -EIO; + +out_free: + intel_timeline_put(tl); + return err; +} + +static int live_hwsp_rollover_kernel(void *arg) +{ + struct intel_gt *gt = arg; + struct intel_engine_cs *engine; + enum intel_engine_id id; + int err = 0; + + /* + * Run the host for long enough, and even the kernel context will + * see a seqno rollover. + */ + + for_each_engine(engine, gt, id) { + struct intel_context *ce = engine->kernel_context; + struct intel_timeline *tl = ce->timeline; + struct i915_request *rq[3] = {}; + int i; + + st_engine_heartbeat_disable(engine); + if (intel_gt_wait_for_idle(gt, HZ / 2)) { + err = -EIO; + goto out; + } + + GEM_BUG_ON(i915_active_fence_isset(&tl->last_request)); + tl->seqno = -2u; + WRITE_ONCE(*(u32 *)tl->hwsp_seqno, tl->seqno); + + for (i = 0; i < ARRAY_SIZE(rq); i++) { + struct i915_request *this; + + this = i915_request_create(ce); + if (IS_ERR(this)) { + err = PTR_ERR(this); + goto out; + } + + pr_debug("%s: create fence.seqnp:%d\n", + engine->name, + lower_32_bits(this->fence.seqno)); + + GEM_BUG_ON(rcu_access_pointer(this->timeline) != tl); + + rq[i] = i915_request_get(this); + i915_request_add(this); + } + + /* We expected a wrap! */ + GEM_BUG_ON(rq[2]->fence.seqno > rq[0]->fence.seqno); + + if (i915_request_wait(rq[2], 0, HZ / 5) < 0) { + pr_err("Wait for timeline wrap timed out!\n"); + err = -EIO; + goto out; + } + + for (i = 0; i < ARRAY_SIZE(rq); i++) { + if (!i915_request_completed(rq[i])) { + pr_err("Pre-wrap request not completed!\n"); + err = -EINVAL; + goto out; + } + } + +out: + for (i = 0; i < ARRAY_SIZE(rq); i++) + i915_request_put(rq[i]); + st_engine_heartbeat_enable(engine); + if (err) + break; + } + + if (igt_flush_test(gt->i915)) + err = -EIO; + + return err; +} + +static int live_hwsp_rollover_user(void *arg) +{ + struct intel_gt *gt = arg; + struct intel_engine_cs *engine; + enum intel_engine_id id; + int err = 0; + + /* + * Simulate a long running user context, and force the seqno wrap + * on the user's timeline. + */ + + for_each_engine(engine, gt, id) { + struct i915_request *rq[3] = {}; + struct intel_timeline *tl; + struct intel_context *ce; + int i; + + ce = intel_context_create(engine); + if (IS_ERR(ce)) + return PTR_ERR(ce); + + err = intel_context_alloc_state(ce); + if (err) + goto out; + + tl = ce->timeline; + if (!tl->has_initial_breadcrumb) + goto out; + + err = intel_context_pin(ce); + if (err) + goto out; + + tl->seqno = -4u; + WRITE_ONCE(*(u32 *)tl->hwsp_seqno, tl->seqno); + + for (i = 0; i < ARRAY_SIZE(rq); i++) { + struct i915_request *this; + + this = intel_context_create_request(ce); + if (IS_ERR(this)) { + err = PTR_ERR(this); + goto out_unpin; + } + + pr_debug("%s: create fence.seqnp:%d\n", + engine->name, + lower_32_bits(this->fence.seqno)); + + GEM_BUG_ON(rcu_access_pointer(this->timeline) != tl); + + rq[i] = i915_request_get(this); + i915_request_add(this); + } + + /* We expected a wrap! */ + GEM_BUG_ON(rq[2]->fence.seqno > rq[0]->fence.seqno); + + if (i915_request_wait(rq[2], 0, HZ / 5) < 0) { + pr_err("Wait for timeline wrap timed out!\n"); + err = -EIO; + goto out_unpin; + } + + for (i = 0; i < ARRAY_SIZE(rq); i++) { + if (!i915_request_completed(rq[i])) { + pr_err("Pre-wrap request not completed!\n"); + err = -EINVAL; + goto out_unpin; + } + } +out_unpin: + intel_context_unpin(ce); +out: + for (i = 0; i < ARRAY_SIZE(rq); i++) + i915_request_put(rq[i]); + intel_context_put(ce); + if (err) + break; + } + + if (igt_flush_test(gt->i915)) + err = -EIO; + + return err; +} + +static int live_hwsp_recycle(void *arg) +{ + struct intel_gt *gt = arg; + struct intel_engine_cs *engine; + enum intel_engine_id id; + unsigned long count; + int err = 0; + + /* + * Check seqno writes into one timeline at a time. We expect to + * recycle the breadcrumb slot between iterations and neither + * want to confuse ourselves or the GPU. + */ + + count = 0; + for_each_engine(engine, gt, id) { + IGT_TIMEOUT(end_time); + + if (!intel_engine_can_store_dword(engine)) + continue; + + intel_engine_pm_get(engine); + + do { + struct intel_timeline *tl; + struct i915_request *rq; + + tl = intel_timeline_create(gt); + if (IS_ERR(tl)) { + err = PTR_ERR(tl); + break; + } + + rq = checked_tl_write(tl, engine, count); + if (IS_ERR(rq)) { + intel_timeline_put(tl); + err = PTR_ERR(rq); + break; + } + + if (i915_request_wait(rq, 0, HZ / 5) < 0) { + pr_err("Wait for timeline writes timed out!\n"); + i915_request_put(rq); + intel_timeline_put(tl); + err = -EIO; + break; + } + + if (READ_ONCE(*tl->hwsp_seqno) != count) { + GEM_TRACE_ERR("Invalid seqno:%lu stored in timeline %llu @ %x found 0x%x\n", + count, tl->fence_context, + tl->hwsp_offset, *tl->hwsp_seqno); + GEM_TRACE_DUMP(); + err = -EINVAL; + } + + i915_request_put(rq); + intel_timeline_put(tl); + count++; + + if (err) + break; + } while (!__igt_timeout(end_time, NULL)); + + intel_engine_pm_put(engine); + if (err) + break; + } + + return err; +} + +int intel_timeline_live_selftests(struct drm_i915_private *i915) +{ + static const struct i915_subtest tests[] = { + SUBTEST(live_hwsp_recycle), + SUBTEST(live_hwsp_engine), + SUBTEST(live_hwsp_alternate), + SUBTEST(live_hwsp_wrap), + SUBTEST(live_hwsp_read), + SUBTEST(live_hwsp_rollover_kernel), + SUBTEST(live_hwsp_rollover_user), + }; + + if (intel_gt_is_wedged(to_gt(i915))) + return 0; + + return intel_gt_live_subtests(tests, to_gt(i915)); +} |