1 files changed, 388 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/gt/selftest_tlb.c b/drivers/gpu/drm/i915/gt/selftest_tlb.c
new file mode 100644
index 000000000000..e6cac1f15d6e
--- /dev/null
+++ b/drivers/gpu/drm/i915/gt/selftest_tlb.c
@@ -0,0 +1,388 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2022 Intel Corporation
+ */
+
+#include "i915_selftest.h"
+
+#include "gem/i915_gem_internal.h"
+#include "gem/i915_gem_region.h"
+
+#include "gen8_engine_cs.h"
+#include "i915_gem_ww.h"
+#include "intel_engine_regs.h"
+#include "intel_gpu_commands.h"
+#include "intel_context.h"
+#include "intel_gt.h"
+#include "intel_ring.h"
+
+#include "selftests/igt_flush_test.h"
+#include "selftests/i915_random.h"
+
+static void vma_set_qw(struct i915_vma *vma, u64 addr, u64 val)
+{
+	GEM_BUG_ON(addr < i915_vma_offset(vma));
+	GEM_BUG_ON(addr >= i915_vma_offset(vma) + i915_vma_size(vma) + sizeof(val));
+	memset64(page_mask_bits(vma->obj->mm.mapping) +
+		 (addr - i915_vma_offset(vma)), val, 1);
+}
+
+static int
+pte_tlbinv(struct intel_context *ce,
+	   struct i915_vma *va,
+	   struct i915_vma *vb,
+	   u64 align,
+	   void (*tlbinv)(struct i915_address_space *vm, u64 addr, u64 length),
+	   u64 length,
+	   struct rnd_state *prng)
+{
+	struct drm_i915_gem_object *batch;
+	struct drm_mm_node vb_node;
+	struct i915_request *rq;
+	struct i915_vma *vma;
+	u64 addr;
+	int err;
+	u32 *cs;
+
+	batch = i915_gem_object_create_internal(ce->vm->i915, 4096);
+	if (IS_ERR(batch))
+		return PTR_ERR(batch);
+
+	vma = i915_vma_instance(batch, ce->vm, NULL);
+	if (IS_ERR(vma)) {
+		err = PTR_ERR(vma);
+		goto out;
+	}
+
+	err = i915_vma_pin(vma, 0, 0, PIN_USER);
+	if (err)
+		goto out;
+
+	/* Pin va at random but aligned offset after vma */
+	addr = round_up(vma->node.start + vma->node.size, align);
+	/* MI_CONDITIONAL_BATCH_BUFFER_END limits address to 48b */
+	addr = igt_random_offset(prng, addr, min(ce->vm->total, BIT_ULL(48)),
+				 va->size, align);
+	err = i915_vma_pin(va,  0, 0, addr | PIN_OFFSET_FIXED | PIN_USER);
+	if (err) {
+		pr_err("Cannot pin at %llx+%llx\n", addr, va->size);
+		goto out;
+	}
+	GEM_BUG_ON(i915_vma_offset(va) != addr);
+	if (vb != va) {
+		vb_node = vb->node;
+		vb->node = va->node; /* overwrites the _same_ PTE  */
+	}
+
+	/*
+	 * Now choose random dword at the 1st pinned page.
+	 *
+	 * SZ_64K pages on dg1 require that the whole PT be marked
+	 * containing 64KiB entries. So we make sure that vma
+	 * covers the whole PT, despite being randomly aligned to 64KiB
+	 * and restrict our sampling to the 2MiB PT within where
+	 * we know that we will be using 64KiB pages.
+	 */
+	if (align == SZ_64K)
+		addr = round_up(addr, SZ_2M);
+	addr = igt_random_offset(prng, addr, addr + align, 8, 8);
+
+	if (va != vb)
+		pr_info("%s(%s): Sampling %llx, with alignment %llx, using PTE size %x (phys %x, sg %x), invalidate:%llx+%llx\n",
+			ce->engine->name, va->obj->mm.region->name ?: "smem",
+			addr, align, va->resource->page_sizes_gtt,
+			va->page_sizes.phys, va->page_sizes.sg,
+			addr & -length, length);
+
+	cs = i915_gem_object_pin_map_unlocked(batch, I915_MAP_WC);
+	*cs++ = MI_NOOP; /* for later termination */
+	/*
+	 * Sample the target to see if we spot the updated backing store.
+	 * Gen8 VCS compares immediate value with bitwise-and of two
+	 * consecutive DWORDS pointed by addr, other gen/engines compare value
+	 * with DWORD pointed by addr. Moreover we want to exercise DWORD size
+	 * invalidations. To fulfill all these requirements below values
+	 * have been chosen.
+	 */
+	*cs++ = MI_CONDITIONAL_BATCH_BUFFER_END | MI_DO_COMPARE | 2;
+	*cs++ = 0; /* break if *addr == 0 */
+	*cs++ = lower_32_bits(addr);
+	*cs++ = upper_32_bits(addr);
+	vma_set_qw(va, addr, -1);
+	vma_set_qw(vb, addr, 0);
+
+	/* Keep sampling until we get bored */
+	*cs++ = MI_BATCH_BUFFER_START | BIT(8) | 1;
+	*cs++ = lower_32_bits(i915_vma_offset(vma));
+	*cs++ = upper_32_bits(i915_vma_offset(vma));
+
+	i915_gem_object_flush_map(batch);
+
+	rq = i915_request_create(ce);
+	if (IS_ERR(rq)) {
+		err = PTR_ERR(rq);
+		goto out_va;
+	}
+
+	err = rq->engine->emit_bb_start(rq, i915_vma_offset(vma), 0, 0);
+	if (err) {
+		i915_request_add(rq);
+		goto out_va;
+	}
+
+	i915_request_get(rq);
+	i915_request_add(rq);
+
+	/* Short sleep to sanitycheck the batch is spinning before we begin */
+	msleep(10);
+	if (va == vb) {
+		if (!i915_request_completed(rq)) {
+			pr_err("%s(%s): Semaphore sanitycheck failed %llx, with alignment %llx, using PTE size %x (phys %x, sg %x)\n",
+			       ce->engine->name, va->obj->mm.region->name ?: "smem",
+			       addr, align, va->resource->page_sizes_gtt,
+			       va->page_sizes.phys, va->page_sizes.sg);
+			err = -EIO;
+		}
+	} else if (!i915_request_completed(rq)) {
+		struct i915_vma_resource vb_res = {
+			.bi.pages = vb->obj->mm.pages,
+			.bi.page_sizes = vb->obj->mm.page_sizes,
+			.start = i915_vma_offset(vb),
+			.vma_size = i915_vma_size(vb)
+		};
+		unsigned int pte_flags = 0;
+
+		/* Flip the PTE between A and B */
+		if (i915_gem_object_is_lmem(vb->obj))
+			pte_flags |= PTE_LM;
+		ce->vm->insert_entries(ce->vm, &vb_res, 0, pte_flags);
+
+		/* Flush the PTE update to concurrent HW */
+		tlbinv(ce->vm, addr & -length, length);
+
+		if (wait_for(i915_request_completed(rq), HZ / 2)) {
+			pr_err("%s: Request did not complete; the COND_BBE did not read the updated PTE\n",
+			       ce->engine->name);
+			err = -EINVAL;
+		}
+	} else {
+		pr_err("Spinner ended unexpectedly\n");
+		err = -EIO;
+	}
+	i915_request_put(rq);
+
+	cs = page_mask_bits(batch->mm.mapping);
+	*cs = MI_BATCH_BUFFER_END;
+	wmb();
+
+out_va:
+	if (vb != va)
+		vb->node = vb_node;
+	i915_vma_unpin(va);
+	if (i915_vma_unbind_unlocked(va))
+		err = -EIO;
+out:
+	i915_gem_object_put(batch);
+	return err;
+}
+
+static struct drm_i915_gem_object *create_lmem(struct intel_gt *gt)
+{
+	/*
+	 * Allocation of largest possible page size allows to test all types
+	 * of pages.
+	 */
+	return i915_gem_object_create_lmem(gt->i915, SZ_1G, I915_BO_ALLOC_CONTIGUOUS);
+}
+
+static struct drm_i915_gem_object *create_smem(struct intel_gt *gt)
+{
+	/*
+	 * SZ_64K pages require covering the whole 2M PT (gen8 to tgl/dg1).
+	 * While that does not require the whole 2M block to be contiguous
+	 * it is easier to make it so, since we need that for SZ_2M pagees.
+	 * Since we randomly offset the start of the vma, we need a 4M object
+	 * so that there is a 2M range within it is suitable for SZ_64K PTE.
+	 */
+	return i915_gem_object_create_internal(gt->i915, SZ_4M);
+}
+
+static int
+mem_tlbinv(struct intel_gt *gt,
+	   struct drm_i915_gem_object *(*create_fn)(struct intel_gt *),
+	   void (*tlbinv)(struct i915_address_space *vm, u64 addr, u64 length))
+{
+	unsigned int ppgtt_size = RUNTIME_INFO(gt->i915)->ppgtt_size;
+	struct intel_engine_cs *engine;
+	struct drm_i915_gem_object *A, *B;
+	struct i915_ppgtt *ppgtt;
+	struct i915_vma *va, *vb;
+	enum intel_engine_id id;
+	I915_RND_STATE(prng);
+	void *vaddr;
+	int err;
+
+	/*
+	 * Check that the TLB invalidate is able to revoke an active
+	 * page. We load a page into a spinning COND_BBE loop and then
+	 * remap that page to a new physical address. The old address, and
+	 * so the loop keeps spinning, is retained in the TLB cache until
+	 * we issue an invalidate.
+	 */
+
+	A = create_fn(gt);
+	if (IS_ERR(A))
+		return PTR_ERR(A);
+
+	vaddr = i915_gem_object_pin_map_unlocked(A, I915_MAP_WC);
+	if (IS_ERR(vaddr)) {
+		err = PTR_ERR(vaddr);
+		goto out_a;
+	}
+
+	B = create_fn(gt);
+	if (IS_ERR(B)) {
+		err = PTR_ERR(B);
+		goto out_a;
+	}
+
+	vaddr = i915_gem_object_pin_map_unlocked(B, I915_MAP_WC);
+	if (IS_ERR(vaddr)) {
+		err = PTR_ERR(vaddr);
+		goto out_b;
+	}
+
+	GEM_BUG_ON(A->base.size != B->base.size);
+	if ((A->mm.page_sizes.phys | B->mm.page_sizes.phys) & (A->base.size - 1))
+		pr_warn("Failed to allocate contiguous pages for size %zx\n",
+			A->base.size);
+
+	ppgtt = i915_ppgtt_create(gt, 0);
+	if (IS_ERR(ppgtt)) {
+		err = PTR_ERR(ppgtt);
+		goto out_b;
+	}
+
+	va = i915_vma_instance(A, &ppgtt->vm, NULL);
+	if (IS_ERR(va)) {
+		err = PTR_ERR(va);
+		goto out_vm;
+	}
+
+	vb = i915_vma_instance(B, &ppgtt->vm, NULL);
+	if (IS_ERR(vb)) {
+		err = PTR_ERR(vb);
+		goto out_vm;
+	}
+
+	err = 0;
+	for_each_engine(engine, gt, id) {
+		struct i915_gem_ww_ctx ww;
+		struct intel_context *ce;
+		int bit;
+
+		ce = intel_context_create(engine);
+		if (IS_ERR(ce)) {
+			err = PTR_ERR(ce);
+			break;
+		}
+
+		i915_vm_put(ce->vm);
+		ce->vm = i915_vm_get(&ppgtt->vm);
+
+		for_i915_gem_ww(&ww, err, true)
+			err = intel_context_pin_ww(ce, &ww);
+		if (err)
+			goto err_put;
+
+		for_each_set_bit(bit,
+				 (unsigned long *)&RUNTIME_INFO(gt->i915)->page_sizes,
+				 BITS_PER_TYPE(RUNTIME_INFO(gt->i915)->page_sizes)) {
+			unsigned int len;
+
+			if (BIT_ULL(bit) < i915_vm_obj_min_alignment(va->vm, va->obj))
+				continue;
+
+			/* sanitycheck the semaphore wake up */
+			err = pte_tlbinv(ce, va, va,
+					 BIT_ULL(bit),
+					 NULL, SZ_4K,
+					 &prng);
+			if (err)
+				goto err_unpin;
+
+			for (len = 2; len <= ppgtt_size; len = min(2 * len, ppgtt_size)) {
+				err = pte_tlbinv(ce, va, vb,
+						 BIT_ULL(bit),
+						 tlbinv,
+						 BIT_ULL(len),
+						 &prng);
+				if (err)
+					goto err_unpin;
+				if (len == ppgtt_size)
+					break;
+			}
+		}
+err_unpin:
+		intel_context_unpin(ce);
+err_put:
+		intel_context_put(ce);
+		if (err)
+			break;
+	}
+
+	if (igt_flush_test(gt->i915))
+		err = -EIO;
+
+out_vm:
+	i915_vm_put(&ppgtt->vm);
+out_b:
+	i915_gem_object_put(B);
+out_a:
+	i915_gem_object_put(A);
+	return err;
+}
+
+static void tlbinv_full(struct i915_address_space *vm, u64 addr, u64 length)
+{
+	intel_gt_invalidate_tlb(vm->gt, intel_gt_tlb_seqno(vm->gt) | 1);
+}
+
+static int invalidate_full(void *arg)
+{
+	struct intel_gt *gt = arg;
+	int err;
+
+	if (GRAPHICS_VER(gt->i915) < 8)
+		return 0; /* TLB invalidate not implemented */
+
+	err = mem_tlbinv(gt, create_smem, tlbinv_full);
+	if (err == 0)
+		err = mem_tlbinv(gt, create_lmem, tlbinv_full);
+	if (err == -ENODEV || err == -ENXIO)
+		err = 0;
+
+	return err;
+}
+
+int intel_tlb_live_selftests(struct drm_i915_private *i915)
+{
+	static const struct i915_subtest tests[] = {
+		SUBTEST(invalidate_full),
+	};
+	struct intel_gt *gt;
+	unsigned int i;
+
+	for_each_gt(gt, i915, i) {
+		int err;
+
+		if (intel_gt_is_wedged(gt))
+			continue;
+
+		err = intel_gt_live_subtests(tests, gt);
+		if (err)
+			return err;
+	}
+
+	return 0;
+}