[PATCH 17/22] drm/i915/selftests: huge page tests

Matthew Auld
2017-08-15T18:17:08Z

v2: mock test page support configurations and add MI_STORE_DWORD test

v3: run all mockable huge page tests on all platforms via the mock_device

v4: add pin_update regression test
various improvements suggested by Chris

v4: fix issues reported by kbuild
test single sg spanning multiple page sizes
don't explode when running the live-tests through the appgtt

Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
---
drivers/gpu/drm/i915/i915_gem.c | 1 +
drivers/gpu/drm/i915/selftests/huge_pages.c | 1281 ++++++++++++++++++++
.../gpu/drm/i915/selftests/i915_live_selftests.h | 1 +
.../gpu/drm/i915/selftests/i915_mock_selftests.h | 1 +
4 files changed, 1284 insertions(+)
create mode 100644 drivers/gpu/drm/i915/selftests/huge_pages.c

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index f924a336aaa1..7393b61f1f17 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -5423,6 +5423,7 @@ int i915_gem_object_attach_phys(struct drm_i915_gem_object *obj, int align)
#include "selftests/scatterlist.c"
#include "selftests/mock_gem_device.c"
#include "selftests/huge_gem_object.c"
+#include "selftests/huge_pages.c"
#include "selftests/i915_gem_object.c"
#include "selftests/i915_gem_coherency.c"
#endif
diff --git a/drivers/gpu/drm/i915/selftests/huge_pages.c b/drivers/gpu/drm/i915/selftests/huge_pages.c
new file mode 100644
index 000000000000..45230348c8d3
--- /dev/null
+++ b/drivers/gpu/drm/i915/selftests/huge_pages.c
@@ -0,0 +1,1281 @@
+/*
+ * Copyright © 2017 Intel Corporation
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ *
+ */
+
+#include "../i915_selftest.h"
+
+#include <linux/prime_numbers.h>
+
+#include "mock_drm.h"
+
+static const unsigned int page_sizes[] = {
+ I915_GTT_PAGE_SIZE_1G,
+ I915_GTT_PAGE_SIZE_2M,
+ I915_GTT_PAGE_SIZE_64K,
+ I915_GTT_PAGE_SIZE_4K,
+};
+
+static unsigned int get_largest_page_size(struct drm_i915_private *i915,
+ size_t rem)
+{
+ int i;
+
+ for (i = 0; i < ARRAY_SIZE(page_sizes); ++i) {
+ unsigned int page_size = page_sizes[i];
+
+ if (HAS_PAGE_SIZE(i915, page_size) && rem >= page_size)
+ return page_size;
+ }
+
+ return 0;
+}
+
+static struct sg_table *
+fake_get_huge_pages(struct drm_i915_gem_object *obj,
+ unsigned int *sg_mask)
+{
+#define GFP (GFP_KERNEL | __GFP_NOWARN | __GFP_NORETRY)
+ struct drm_i915_private *i915 = to_i915(obj->base.dev);
+ size_t max_len = rounddown_pow_of_two(UINT_MAX);
+ struct sg_table *st;
+ struct scatterlist *sg;
+ size_t rem;
+
+ st = kmalloc(sizeof(*st), GFP);
+ if (!st)
+ return ERR_PTR(-ENOMEM);
+
+ if (sg_alloc_table(st, obj->base.size >> PAGE_SHIFT, GFP)) {
+ kfree(st);
+ return ERR_PTR(-ENOMEM);
+ }
+
+ /* Use optimal page sized chunks to fill in the sg table */
+ rem = obj->base.size;
+ sg = st->sgl;
+ st->nents = 0;
+ do {
+ unsigned int page_size = get_largest_page_size(i915, rem);
+ unsigned int len = min(page_size * (rem / page_size), max_len);
+
+ GEM_BUG_ON(!page_size);
+
+ sg->offset = 0;
+ sg->length = len;
+ sg_dma_len(sg) = len;
+ sg_dma_address(sg) = page_size;
+
+ *sg_mask |= len;
+
+ st->nents++;
+
+ rem -= len;
+ if (!rem) {
+ sg_mark_end(sg);
+ break;
+ }
+
+ sg = sg_next(sg);
+ } while (1);
+
+ obj->mm.madv = I915_MADV_DONTNEED;
+
+ return st;
+}
+
+static struct sg_table *
+fake_get_huge_pages_single(struct drm_i915_gem_object *obj,
+ unsigned int *sg_mask)
+{
+ struct drm_i915_private *i915 = to_i915(obj->base.dev);
+ struct sg_table *st;
+ struct scatterlist *sg;
+ unsigned int page_size;
+
+ st = kmalloc(sizeof(*st), GFP);
+ if (!st)
+ return ERR_PTR(-ENOMEM);
+
+ if (sg_alloc_table(st, 1, GFP)) {
+ kfree(st);
+ return ERR_PTR(-ENOMEM);
+ }
+
+ sg = st->sgl;
+ st->nents = 1;
+
+ page_size = get_largest_page_size(i915, obj->base.size);
+
+ GEM_BUG_ON(!page_size);
+
+ sg->offset = 0;
+ sg->length = obj->base.size;
+ sg_dma_len(sg) = obj->base.size;
+ sg_dma_address(sg) = page_size;
+
+ *sg_mask |= obj->base.size;
+
+ obj->mm.madv = I915_MADV_DONTNEED;
+
+ return st;
+#undef GFP
+}
+
+static void fake_free_huge_pages(struct drm_i915_gem_object *obj,
+ struct sg_table *pages)
+{
+ sg_free_table(pages);
+ kfree(pages);
+}
+
+static void fake_put_huge_pages(struct drm_i915_gem_object *obj,
+ struct sg_table *pages)
+{
+ fake_free_huge_pages(obj, pages);
+ obj->mm.dirty = false;
+ obj->mm.madv = I915_MADV_WILLNEED;
+}
+
+static const struct drm_i915_gem_object_ops fake_ops = {
+ .flags = I915_GEM_OBJECT_IS_SHRINKABLE,
+ .get_pages = fake_get_huge_pages,
+ .put_pages = fake_put_huge_pages,
+};
+
+static const struct drm_i915_gem_object_ops fake_ops_single = {
+ .flags = I915_GEM_OBJECT_IS_SHRINKABLE,
+ .get_pages = fake_get_huge_pages_single,
+ .put_pages = fake_put_huge_pages,
+};
+
+static struct drm_i915_gem_object *
+fake_huge_pages_object(struct drm_i915_private *i915, u64 size, bool single)
+{
+ struct drm_i915_gem_object *obj;
+
+ GEM_BUG_ON(!size);
+ GEM_BUG_ON(!IS_ALIGNED(size, I915_GTT_PAGE_SIZE));
+
+ if (size >> PAGE_SHIFT > UINT_MAX)
+ return ERR_PTR(-E2BIG);
+
+ if (overflows_type(size, obj->base.size))
+ return ERR_PTR(-E2BIG);
+
+ obj = i915_gem_object_alloc(i915);
+ if (!obj)
+ return ERR_PTR(-ENOMEM);
+
+ drm_gem_private_object_init(&i915->drm, &obj->base, size);
+
+ if (single)
+ i915_gem_object_init(obj, &fake_ops_single);
+ else
+ i915_gem_object_init(obj, &fake_ops);
+
+ obj->base.write_domain = I915_GEM_DOMAIN_CPU;
+ obj->base.read_domains = I915_GEM_DOMAIN_CPU;
+ obj->cache_level = I915_CACHE_NONE;
+
+ return obj;
+}
+
+static int igt_mock_exhaust_device_supported_pages(void *arg)
+{
+ struct i915_hw_ppgtt *ppgtt = arg;
+ struct drm_i915_private *i915 = ppgtt->base.i915;
+ unsigned int saved_mask = INTEL_INFO(i915)->page_size_mask;
+ struct drm_i915_gem_object *obj;
+ int i, j, single;
+ int err;
+
+ /* Sanity check creating objects with every valid page support
+ * combination for our mock device.
+ */
+
+ for (i = 1; i < BIT(ARRAY_SIZE(page_sizes)); i++) {
+ unsigned int combination = 0;
+ struct i915_vma *vma;
+
+ for (j = 0; j < ARRAY_SIZE(page_sizes); j++) {
+ if (i & BIT(j))
+ combination |= page_sizes[j];
+ }
+
+ mkwrite_device_info(i915)->page_size_mask = combination;
+
+ for (single = 0; single <= 1; ++single) {
+ obj = fake_huge_pages_object(i915, combination, !!single);
+ if (IS_ERR(obj)) {
+ err = PTR_ERR(obj);
+ goto out_device;
+ }
+
+ GEM_BUG_ON(obj->base.size != combination);
+
+ err = i915_gem_object_pin_pages(obj);
+ if (err)
+ goto out_put;
+
+ GEM_BUG_ON(obj->mm.page_sizes.sg != combination);
+
+ vma = i915_vma_instance(obj, &ppgtt->base, NULL);
+ if (IS_ERR(vma)) {
+ err = PTR_ERR(vma);
+ goto out_unpin;
+ }
+
+ err = i915_vma_pin(vma, 0, 0, PIN_USER);
+ if (err) {
+ i915_vma_close(vma);
+ goto out_unpin;
+ }
+
+ GEM_BUG_ON(obj->mm.page_sizes.gtt);
+ GEM_BUG_ON(!vma->page_sizes.sg);
+ GEM_BUG_ON(!vma->page_sizes.phys);
+
+ GEM_BUG_ON(vma->page_sizes.gtt & ~combination);
+
+ i915_vma_unpin(vma);
+ i915_vma_close(vma);
+
+ i915_gem_object_unpin_pages(obj);
+ i915_gem_object_put(obj);
+ }
+ }
+
+ goto out_device;
+
+out_unpin:
+ i915_gem_object_unpin_pages(obj);
+out_put:
+ i915_gem_object_put(obj);
+out_device:
+ mkwrite_device_info(i915)->page_size_mask = saved_mask;
+
+ return err;
+}
+
+static int igt_mock_ppgtt_misaligned_dma(void *arg)
+{
+ struct i915_hw_ppgtt *ppgtt = arg;
+ struct drm_i915_private *i915 = ppgtt->base.i915;
+ unsigned long supported = INTEL_INFO(i915)->page_size_mask;
+ struct drm_i915_gem_object *obj;
+ int bit;
+ int err;
+
+ /* Sanity check dma misalignment for huge pages -- the dma addresses we
+ * insert into the paging structures need to always respect the page
+ * size alignment.
+ */
+
+ bit = ilog2(I915_GTT_PAGE_SIZE_64K);
+
+ for_each_set_bit_from(bit, &supported, BITS_PER_LONG) {
+ IGT_TIMEOUT(end_time);
+ unsigned int page_size = BIT(bit);
+ unsigned int flags = PIN_USER | PIN_OFFSET_FIXED;
+ struct i915_vma *vma;
+ unsigned int offset;
+ unsigned int size =
+ round_up(page_size, I915_GTT_PAGE_SIZE_2M) << 1;
+
+ obj = fake_huge_pages_object(i915, size, true);
+ if (IS_ERR(obj))
+ return PTR_ERR(obj);
+
+ GEM_BUG_ON(obj->base.size != size);
+
+ err = i915_gem_object_pin_pages(obj);
+ if (err)
+ goto out_put;
+
+ GEM_BUG_ON(!(obj->mm.page_sizes.sg & page_size));
+
+ /* Force the page size for this object */
+ obj->mm.page_sizes.sg = page_size;
+
+ vma = i915_vma_instance(obj, &ppgtt->base, NULL);
+ if (IS_ERR(vma)) {
+ err = PTR_ERR(vma);
+ goto out_unpin;
+ }
+
+ err = i915_vma_pin(vma, 0, 0, flags);
+ if (err) {
+ i915_vma_close(vma);
+ goto out_unpin;
+ }
+
+ GEM_BUG_ON(vma->page_sizes.gtt != page_size);
+
+ i915_vma_unpin(vma);
+ err = i915_vma_unbind(vma);
+ if (err) {
+ i915_vma_close(vma);
+ goto out_unpin;
+ }
+
+ /* Try all the other valid offsets until the next
+ * boundary -- should always fall back to using 4K
+ * pages.
+ */
+ for (offset = 4096; offset < page_size; offset += 4096) {
+ err = i915_vma_pin(vma, 0, 0, flags | offset);
+ if (err) {
+ i915_vma_close(vma);
+ goto out_unpin;
+ }
+
+ GEM_BUG_ON(vma->page_sizes.gtt !=
+ I915_GTT_PAGE_SIZE_4K);
+
+ i915_vma_unpin(vma);
+ err = i915_vma_unbind(vma);
+ if (err) {
+ i915_vma_close(vma);
+ goto out_unpin;
+ }
+
+ if (igt_timeout(end_time,
+ "%s timed out at offset %x with page-size %x\n",
+ __func__, offset, page_size))
+ break;
+ }
+
+ i915_vma_close(vma);
+
+ i915_gem_object_unpin_pages(obj);
+ i915_gem_object_put(obj);
+ }
+
+ return 0;
+
+out_unpin:
+ i915_gem_object_unpin_pages(obj);
+out_put:
+ i915_gem_object_put(obj);
+
+ return err;
+}
+
+static void close_object_list(struct list_head *objects,
+ struct i915_hw_ppgtt *ppgtt)
+{
+ struct drm_i915_gem_object *obj, *on;
+
+ list_for_each_entry_safe(obj, on, objects, st_link) {
+ struct i915_vma *vma;
+
+ vma = i915_vma_instance(obj, &ppgtt->base, NULL);
+ if (!IS_ERR(vma))
+ i915_vma_close(vma);
+
+ list_del(&obj->st_link);
+ i915_gem_object_unpin_pages(obj);
+ i915_gem_object_put(obj);
+ }
+}
+
+static int igt_mock_ppgtt_huge_fill(void *arg)
+{
+ struct i915_hw_ppgtt *ppgtt = arg;
+ struct drm_i915_private *i915 = ppgtt->base.i915;
+ unsigned long max_pages = ppgtt->base.total >> PAGE_SHIFT;
+ unsigned long page_num;
+ bool single = false;
+ LIST_HEAD(objects);
+ IGT_TIMEOUT(end_time);
+ int err;
+
+ for_each_prime_number_from(page_num, 1, max_pages) {
+ struct drm_i915_gem_object *obj;
+ size_t size = page_num << PAGE_SHIFT;
+ struct i915_vma *vma;
+ unsigned int expected_gtt = 0;
+ int i;
+
+ obj = fake_huge_pages_object(i915, size, single);
+ if (IS_ERR(obj)) {
+ err = PTR_ERR(obj);
+ break;
+ }
+
+ GEM_BUG_ON(obj->base.size != size);
+
+ err = i915_gem_object_pin_pages(obj);
+ if (err) {
+ i915_gem_object_put(obj);
+ break;
+ }
+
+ list_add(&obj->st_link, &objects);
+
+ GEM_BUG_ON(!obj->mm.page_sizes.sg);
+
+ vma = i915_vma_instance(obj, &ppgtt->base, NULL);
+ if (IS_ERR(vma)) {
+ err = PTR_ERR(vma);
+ break;
+ }
+
+ err = i915_vma_pin(vma, 0, 0, PIN_USER);
+ if (err)
+ break;
+
+ GEM_BUG_ON(obj->mm.page_sizes.gtt);
+ GEM_BUG_ON(!vma->page_sizes.sg);
+ GEM_BUG_ON(!vma->page_sizes.phys);
+
+ /* Figure out the expected gtt page size knowing that we go from
+ * largest to smallest page size sg chunks, and that we align to
+ * the largest page size.
+ */
+ for (i = 0; i < ARRAY_SIZE(page_sizes); ++i) {
+ unsigned int page_size = page_sizes[i];
+
+ if (HAS_PAGE_SIZE(i915, page_size) &&
+ size >= page_size) {
+ expected_gtt |= page_size;
+ size &= page_size-1;
+ }
+ }
+
+ GEM_BUG_ON(!expected_gtt);
+ GEM_BUG_ON(size);
+
+ if (expected_gtt & I915_GTT_PAGE_SIZE_4K)
+ expected_gtt &= ~I915_GTT_PAGE_SIZE_64K;
+
+ GEM_BUG_ON(vma->page_sizes.gtt != expected_gtt);
+
+ if (vma->page_sizes.sg & I915_GTT_PAGE_SIZE_64K) {
+ GEM_BUG_ON(!IS_ALIGNED(vma->node.start,
+ I915_GTT_PAGE_SIZE_2M));
+ GEM_BUG_ON(!IS_ALIGNED(vma->node.size,
+ I915_GTT_PAGE_SIZE_2M));
+ }
+
+ i915_vma_unpin(vma);
+
+ if (igt_timeout(end_time,
+ "%s timed out at size %zd\n",
+ __func__, obj->base.size))
+ break;
+
+ single = !single;
+ }
+
+ close_object_list(&objects, ppgtt);
+
+ if (err == -ENOMEM || err == -ENOSPC)
+ err = 0;
+
+ return err;
+}
+
+static int igt_mock_ppgtt_64K(void *arg)
+{
+ struct i915_hw_ppgtt *ppgtt = arg;
+ struct drm_i915_private *i915 = ppgtt->base.i915;
+ struct drm_i915_gem_object *obj;
+ const struct object_info {
+ unsigned int size;
+ unsigned int gtt;
+ unsigned int offset;
+ } objects[] = {
+ /* Cases with forced padding/alignment */
+ {
+ .size = SZ_64K,
+ .gtt = I915_GTT_PAGE_SIZE_64K,
+ .offset = 0,
+ },
+ {
+ .size = SZ_64K + SZ_4K,
+ .gtt = I915_GTT_PAGE_SIZE_4K,
+ .offset = 0.
+ },
+ {
+ .size = SZ_2M - SZ_4K,
+ .gtt = I915_GTT_PAGE_SIZE_4K,
+ .offset = 0,
+ },
+ {
+ .size = SZ_2M + SZ_64K,
+ .gtt = I915_GTT_PAGE_SIZE_64K,
+ .offset = 0,
+ },
+ {
+ .size = SZ_2M + SZ_4K,
+ .gtt = I915_GTT_PAGE_SIZE_64K | I915_GTT_PAGE_SIZE_4K,
+ .offset = 0,
+ },
+ /* Try without any forced padding/alignment */
+ {
+ .size = SZ_64K,
+ .offset = SZ_2M,
+ .gtt = I915_GTT_PAGE_SIZE_4K,
+ },
+ {
+ .size = SZ_128K,
+ .offset = SZ_2M - SZ_64K,
+ .gtt = I915_GTT_PAGE_SIZE_4K,
+ },
+ };
+ int i, single;
+ int err;
+
+ /* Sanity check some of the trickiness with 64K pages -- either we can
+ * safely mark the whole page-table(2M block) as 64K, or we have to
+ * always fallback to 4K.
+ */
+
+ if (!HAS_PAGE_SIZE(i915, I915_GTT_PAGE_SIZE_64K))
+ return 0;
+
+ for (i = 0; i < ARRAY_SIZE(objects); ++i) {
+ unsigned int size = objects[i].size;
+ unsigned int expected_gtt = objects[i].gtt;
+ unsigned int offset = objects[i].offset;
+ struct i915_vma *vma;
+ unsigned int flags = PIN_USER;
+
+ for (single = 0; single <= 1; single++) {
+ obj = fake_huge_pages_object(i915, size, !!single);
+ if (IS_ERR(obj))
+ return PTR_ERR(obj);
+
+ err = i915_gem_object_pin_pages(obj);
+ if (err)
+ goto out_put;
+
+ GEM_BUG_ON(!obj->mm.page_sizes.sg);
+
+ /* Disable 2M pages -- We only want to use 64K/4K pages
+ * for this test.
+ */
+ obj->mm.page_sizes.sg &= ~I915_GTT_PAGE_SIZE_2M;
+
+ vma = i915_vma_instance(obj, &ppgtt->base, NULL);
+ if (IS_ERR(vma)) {
+ err = PTR_ERR(vma);
+ goto out_unpin;
+ }
+
+ if (offset)
+ flags |= PIN_OFFSET_FIXED | offset;
+
+ err = i915_vma_pin(vma, 0, 0, flags);
+ if (err) {
+ i915_vma_close(vma);
+ goto out_unpin;
+ }
+
+ GEM_BUG_ON(obj->mm.page_sizes.gtt);
+ GEM_BUG_ON(!vma->page_sizes.sg);
+ GEM_BUG_ON(!vma->page_sizes.phys);
+
+ GEM_BUG_ON(vma->page_sizes.gtt != expected_gtt);
+
+ if (!offset && vma->page_sizes.sg & I915_GTT_PAGE_SIZE_64K) {
+ GEM_BUG_ON(!IS_ALIGNED(vma->node.start,
+ I915_GTT_PAGE_SIZE_2M));
+ GEM_BUG_ON(!IS_ALIGNED(vma->node.size,
+ I915_GTT_PAGE_SIZE_2M));
+ }
+
+ i915_vma_unpin(vma);
+ i915_vma_close(vma);
+
+ i915_gem_object_unpin_pages(obj);
+ i915_gem_object_put(obj);
+ }
+ }
+
+ return 0;
+
+out_unpin:
+ i915_gem_object_unpin_pages(obj);
+out_put:
+ i915_gem_object_put(obj);
+
+ return err;
+}
+
+static struct i915_vma *
+gpu_write_dw(struct i915_vma *vma, u64 offset, u32 val)
+{
+ struct drm_i915_private *i915 = to_i915(vma->obj->base.dev);
+ const int gen = INTEL_GEN(vma->vm->i915);
+ unsigned int count = vma->size >> PAGE_SHIFT;
+ struct drm_i915_gem_object *obj;
+ struct i915_vma *batch;
+ unsigned int size;
+ u32 *cmd;
+ int n;
+ int err;
+
+ GEM_BUG_ON(!igt_can_mi_store_dword_imm(i915));
+
+ size = 1 + 4 * count * sizeof(u32);
+ size = round_up(size, PAGE_SIZE);
+ obj = i915_gem_object_create_internal(i915, size);
+ if (IS_ERR(obj))
+ return ERR_CAST(obj);
+
+ cmd = i915_gem_object_pin_map(obj, I915_MAP_WB);
+ if (IS_ERR(cmd)) {
+ err = PTR_ERR(cmd);
+ goto err;
+ }
+
+ offset += vma->node.start;
+
+ for (n = 0; n < count; n++) {
+ if (gen >= 8) {
+ *cmd++ = MI_STORE_DWORD_IMM_GEN4;
+ *cmd++ = lower_32_bits(offset);
+ *cmd++ = upper_32_bits(offset);
+ *cmd++ = val;
+ } else if (gen >= 4) {
+ *cmd++ = MI_STORE_DWORD_IMM_GEN4 |
+ (gen < 6 ? 1 << 22 : 0);
+ *cmd++ = 0;
+ *cmd++ = offset;
+ *cmd++ = val;
+ } else {
+ *cmd++ = MI_STORE_DWORD_IMM | 1 << 22;
+ *cmd++ = offset;
+ *cmd++ = val;
+ }
+
+ offset += PAGE_SIZE;
+ }
+
+ *cmd = MI_BATCH_BUFFER_END;
+
+ i915_gem_object_unpin_map(obj);
+
+ err = i915_gem_object_set_to_gtt_domain(obj, false);
+ if (err)
+ goto err;
+
+ batch = i915_vma_instance(obj, vma->vm, NULL);
+ if (IS_ERR(batch)) {
+ err = PTR_ERR(batch);
+ goto err;
+ }
+
+ err = i915_vma_pin(batch, 0, 0, PIN_USER);
+ if (err)
+ goto err;
+
+ return batch;
+
+err:
+ i915_gem_object_put(obj);
+
+ return ERR_PTR(err);
+}
+
+static int gpu_write(struct i915_vma *vma,
+ struct i915_gem_context *ctx,
+ u32 dword,
+ u32 value)
+{
+ struct drm_i915_private *i915 = to_i915(vma->obj->base.dev);
+ struct drm_i915_gem_request *rq;
+ struct i915_vma *batch;
+ int flags = 0;
+ int err;
+
+ err = i915_gem_object_set_to_gtt_domain(vma->obj, true);
+ if (err)
+ return err;
+
+ rq = i915_gem_request_alloc(i915->engine[RCS], ctx);
+ if (IS_ERR(rq))
+ return PTR_ERR(rq);
+
+ batch = gpu_write_dw(vma, dword * sizeof(u32), value);
+ if (IS_ERR(batch)) {
+ err = PTR_ERR(batch);
+ goto err_request;
+ }
+
+ i915_vma_move_to_active(batch, rq, 0);
+ i915_gem_object_set_active_reference(batch->obj);
+ i915_vma_unpin(batch);
+ i915_vma_close(batch);
+
+ err = rq->engine->emit_flush(rq, EMIT_INVALIDATE);
+ if (err)
+ goto err_request;
+
+ err = i915_switch_context(rq);
+ if (err)
+ goto err_request;
+
+ err = rq->engine->emit_bb_start(rq,
+ batch->node.start, batch->node.size,
+ flags);
+ if (err)
+ goto err_request;
+
+ i915_vma_move_to_active(vma, rq, 0);
+
+ reservation_object_lock(vma->resv, NULL);
+ reservation_object_add_excl_fence(vma->resv, &rq->fence);
+ reservation_object_unlock(vma->resv);
+
+err_request:
+ __i915_add_request(rq, err == 0);
+
+ return err;
+}
+
+static int unmap_mapping(struct drm_i915_gem_object *obj)
+{
+ void *ptr;
+ int err;
+
+ err = mutex_lock_interruptible(&obj->mm.lock);
+ if (err)
+ return err;
+
+ ptr = page_mask_bits(obj->mm.mapping);
+ if (ptr) {
+ if (is_vmalloc_addr(ptr))
+ vunmap(ptr);
+ else
+ kunmap(kmap_to_page(ptr));
+
+ obj->mm.mapping = NULL;
+ }
+
+ mutex_unlock(&obj->mm.lock);
+
+ return 0;
+}
+
+#define DWORDS_PER_PAGE (PAGE_SIZE/sizeof(u32))
+
+static int cpu_check(struct drm_i915_gem_object *obj, u32 dword, u32 val)
+{
+ enum i915_map_type level;
+ int err;
+
+ for (level = I915_MAP_WB; level <= I915_MAP_WC; level++) {
+ u32 *map, offset;
+
+ if (level == I915_MAP_WB)
+ err = i915_gem_object_set_to_cpu_domain(obj, false);
+ else
+ err = i915_gem_object_set_to_wc_domain(obj, false);
+ if (err)
+ return err;
+
+ unmap_mapping(obj);
+ map = i915_gem_object_pin_map(obj, level);
+ if (IS_ERR(map))
+ return PTR_ERR(map);
+
+ for (offset = dword; offset < obj->base.size/sizeof(u32);
+ offset += DWORDS_PER_PAGE) {
+ if (map[offset] != val) {
+ pr_err("map[%u] = %u, expected %u\n",
+ offset, map[offset], val);
+ err = -EINVAL;
+ goto out_close;
+ }
+ }
+
+ i915_gem_object_unpin_map(obj);
+ }
+
+ return 0;
+
+out_close:
+ i915_gem_object_unpin_map(obj);
+
+ return err;
+}
+
+static int igt_write_huge(struct drm_i915_gem_object *obj)
+{
+ struct drm_i915_private *i915 = to_i915(obj->base.dev);
+ unsigned long supported = INTEL_INFO(i915)->page_size_mask;
+ struct i915_gem_context *ctx = i915->kernel_context;
+ struct i915_address_space *vm = ctx->ppgtt ? &ctx->ppgtt->base : &i915->ggtt.base;
+ unsigned int flags = PIN_USER | PIN_OFFSET_FIXED;
+ struct i915_vma *vma;
+ int bit, last;
+ int err;
+
+ GEM_BUG_ON(obj->base.size != SZ_2M);
+
+ err = i915_gem_object_pin_pages(obj);
+ if (err)
+ return err;
+
+ /* We want to run the test even if the platform doesn't support huge gtt
+ * pages -- our only requirement is that we were able to allocate a
+ * "huge-page".
+ */
+ if (obj->mm.page_sizes.phys < I915_GTT_PAGE_SIZE_2M) {
+ pr_info("Unable to allocate huge-page, finishing test early\n");
+ goto out_unpin;
+ }
+
+ vma = i915_vma_instance(obj, vm, NULL);
+ if (IS_ERR(vma)) {
+ err = PTR_ERR(vma);
+ goto out_unpin;
+ }
+
+ last = ilog2(I915_GTT_PAGE_SIZE_2M);
+
+ for_each_set_bit(bit, &supported, last + 1) {
+ IGT_TIMEOUT(end_time);
+ unsigned int page_size = BIT(bit);
+ u32 max = vm->total / I915_GTT_PAGE_SIZE_2M - 1;
+ u32 num;
+
+ /* Force the page size */
+ vma->page_sizes.sg = obj->mm.page_sizes.sg = page_size;
+
+ /* Try various offsets until we timeout -- we want to avoid
+ * issues hidden by effectively always using offset = 0.
+ */
+ for_each_prime_number_from(num, 0, max) {
+ u64 offset = num * I915_GTT_PAGE_SIZE_2M;
+ u32 dword;
+
+ err = i915_vma_unbind(vma);
+ if (err)
+ goto out_close;
+
+ err = i915_vma_pin(vma, 0, 0, flags | offset);
+ if (err) {
+ /* The ggtt may have some pages reserved so
+ * refrain from erroring out.
+ */
+ if (err == -ENOSPC && i915_is_ggtt(vm))
+ continue;
+
+ goto out_close;
+ }
+
+ GEM_BUG_ON(obj->mm.page_sizes.gtt);
+ GEM_BUG_ON(vma->page_sizes.sg != page_size);
+ GEM_BUG_ON(!vma->page_sizes.phys);
+
+ if (vma->page_sizes.gtt != page_size) {
+ dma_addr_t addr =
+ i915_gem_object_get_dma_address(obj, 0);
+
+ /* The only valid reason for this to ever fail
+ * would be if the dma-mapper screwed us over
+ * when we did the dma_map_sg(), since it has
+ * the final say over the dma address.
+ */
+ GEM_BUG_ON(IS_ALIGNED(addr,
+ I915_GTT_PAGE_SIZE_2M));
+
+ pr_info("dma address misaligned, hobbling on\n");
+ }
+
+ for (dword = 0; dword < DWORDS_PER_PAGE; ++dword) {
+ err = gpu_write(vma, ctx, dword, num + 1);
+ if (err) {
+ pr_err("gpu_write failed with page-size %x\n",
+ page_size);
+ i915_vma_unpin(vma);
+ goto out_close;
+ }
+
+ err = cpu_check(obj, dword, num + 1);
+ if (err) {
+ pr_err("cpu_check failed with page-size %x\n",
+ page_size);
+ i915_vma_unpin(vma);
+ goto out_close;
+ }
+ }
+
+ i915_vma_unpin(vma);
+
+ if (num > 0 &&
+ igt_timeout(end_time,
+ "%s timed out at offset %llx with ps %x\n",
+ __func__, offset, page_size))
+ break;
+ }
+ }
+
+out_close:
+ i915_vma_close(vma);
+out_unpin:
+ i915_gem_object_unpin_pages(obj);
+
+ return err;
+}
+
+static int igt_ppgtt_write_huge(void *arg)
+{
+ struct drm_i915_private *i915 = arg;
+ struct drm_i915_gem_object *obj;
+ int err;
+
+ /* Sanity check that the HW uses huge pages correctly -- ensure that
+ * our writes land in the right place
+ */
+
+ if (!igt_can_mi_store_dword_imm(i915)) {
+ pr_info("store-dword-imm not supported, skipping\n");
+ return 0;
+ }
+
+ /* Try without thp */
+ obj = i915_gem_object_create_internal(i915, SZ_2M);
+ if (IS_ERR(obj))
+ return PTR_ERR(obj);
+
+ err = igt_write_huge(obj);
+ i915_gem_object_put(obj);
+ if (err) {
+ pr_err("write-huge failed with internal allocator\n");
+ return err;
+ }
+
+ if (!has_transparent_hugepage()) {
+ pr_info("thp not supported, skipping\n");
+ return 0;
+ }
+
+ /* Try with thp through gemfs */
+ obj = i915_gem_object_create(i915, SZ_2M);
+ if (IS_ERR(obj))
+ return PTR_ERR(obj);
+
+ err = igt_write_huge(obj);
+ i915_gem_object_put(obj);
+ if (err)
+ pr_err("write-huge failed with thp\n");
+
+ return err;
+}
+
+static int igt_ppgtt_pin_update(void *arg)
+{
+ struct drm_i915_private *dev_priv = arg;
+ unsigned long supported = INTEL_INFO(dev_priv)->page_size_mask;
+ struct i915_hw_ppgtt *ppgtt = dev_priv->kernel_context->ppgtt;
+ struct drm_i915_gem_object *obj;
+ struct i915_vma *vma;
+ unsigned int flags = PIN_USER | PIN_OFFSET_FIXED;
+ unsigned int needs_flush;
+ int bit, last;
+ u32 *ptr;
+ int err;
+
+ /* Make sure there's no funny business when doing a PIN_UPDATE -- in the
+ * past we had a subtle issue with being able to incorrectly do multiple
+ * alloc va ranges on the same object when doing a PIN_UPDATE, which
+ * resulted in some pretty nasty bugs, though only when using
+ * huge-gtt-pages.
+ */
+
+ if (!USES_FULL_48BIT_PPGTT(dev_priv)) {
+ pr_info("48b PPGTT not supported, skipping\n");
+ return 0;
+ }
+
+ bit = ilog2(I915_GTT_PAGE_SIZE_64K);
+ last = ilog2(I915_GTT_PAGE_SIZE_2M);
+
+ for_each_set_bit_from(bit, &supported, last + 1) {
+ unsigned int page_size = BIT(bit);
+
+ obj = i915_gem_object_create_internal(dev_priv, SZ_2M);
+ if (IS_ERR(obj))
+ return PTR_ERR(obj);
+
+ vma = i915_vma_instance(obj, &ppgtt->base, NULL);
+ if (IS_ERR(vma)) {
+ err = PTR_ERR(vma);
+ goto out_put;
+ }
+
+ err = i915_vma_pin(vma, 0, 0, flags);
+ if (err)
+ goto out_close;
+
+ if (vma->page_sizes.sg < page_size) {
+ pr_info("Unable to allocate page-size %x, finishing test early\n",
+ page_size);
+ goto out_unpin;
+ }
+
+ if (vma->page_sizes.gtt != page_size) {
+ dma_addr_t addr = i915_gem_object_get_dma_address(obj, 0);
+
+ /* The only valid reason for this to ever fail would be
+ * if the dma-mapper screwed us over when we did the
+ * dma_map_sg(), since it has the final say over the dma
+ * address.
+ */
+ GEM_BUG_ON(IS_ALIGNED(addr, page_size));
+
+ pr_info("dma address misaligned, finishing test early\n");
+ goto out_unpin;
+ }
+
+ err = i915_vma_bind(vma, I915_CACHE_NONE, PIN_UPDATE);
+ if (err)
+ goto out_unpin;
+
+ i915_vma_unpin(vma);
+ i915_vma_close(vma);
+
+ i915_gem_object_put(obj);
+ }
+
+ obj = i915_gem_object_create_internal(dev_priv, PAGE_SIZE);
+ if (IS_ERR(obj))
+ return PTR_ERR(obj);
+
+ vma = i915_vma_instance(obj, &ppgtt->base, NULL);
+ if (IS_ERR(vma)) {
+ err = PTR_ERR(vma);
+ goto out_put;
+ }
+
+ err = i915_vma_pin(vma, 0, 0, flags);
+ if (err)
+ goto out_close;
+
+ /* Make sure we don't end up with something like where the pde is still
+ * pointing to the 2M page, and the pt we just filled-in is dangling --
+ * we can check this by writing to the first page where it would then
+ * land in the now stale 2M page.
+ */
+
+ err = gpu_write(vma, dev_priv->kernel_context, 0, 0xdeadbeaf);
+ if (err)
+ goto out_unpin;
+
+ err = i915_gem_obj_prepare_shmem_read(obj, &needs_flush);
+ if (err)
+ goto out_unpin;
+
+ ptr = kmap_atomic(i915_gem_object_get_page(obj, 0));
+ if (needs_flush & CLFLUSH_BEFORE)
+ drm_clflush_virt_range(ptr, PAGE_SIZE);
+
+ if (*ptr != 0xdeadbeaf) {
+ pr_err("ptr = %x, expected %x\n", *ptr, 0xdeadbeaf);
+ err = -EINVAL;
+ }
+
+ kunmap_atomic(ptr);
+
+ i915_gem_obj_finish_shmem_access(obj);
+
+out_unpin:
+ i915_vma_unpin(vma);
+out_close:
+ i915_vma_close(vma);
+out_put:
+ i915_gem_object_put(obj);
+
+ return err;
+}
+
+static int igt_ppgtt_gemfs_huge(void *arg)
+{
+ struct drm_i915_private *i915 = arg;
+ struct i915_gem_context *ctx = i915->kernel_context;
+ struct i915_address_space *vm = ctx->ppgtt ? &ctx->ppgtt->base : &i915->ggtt.base;
+ struct drm_i915_gem_object *obj;
+ const unsigned int object_sizes[] = {
+ I915_GTT_PAGE_SIZE_2M,
+ I915_GTT_PAGE_SIZE_2M + I915_GTT_PAGE_SIZE_4K,
+ };
+ unsigned int flags = PIN_USER;
+ int err;
+ int i;
+
+ /* Sanity check THP through gemfs */
+
+ if (!has_transparent_hugepage()) {
+ pr_info("thp not supported, skipping\n");
+ return 0;
+ }
+
+ for (i = 0; i < ARRAY_SIZE(object_sizes); ++i) {
+ unsigned int size = object_sizes[i];
+ struct i915_vma *vma;
+
+ obj = i915_gem_object_create(i915, size);
+ if (IS_ERR(obj))
+ return PTR_ERR(obj);
+
+ err = i915_gem_object_pin_pages(obj);
+ if (err)
+ goto out_put;
+
+ GEM_BUG_ON(!obj->mm.page_sizes.sg);
+
+ if (obj->mm.page_sizes.phys < I915_GTT_PAGE_SIZE_2M) {
+ pr_info("Unable to allocate thp, finishing test early\n");
+ goto out_unpin;
+ }
+
+ vma = i915_vma_instance(obj, vm, NULL);
+ if (IS_ERR(vma)) {
+ err = PTR_ERR(vma);
+ goto out_unpin;
+ }
+
+ err = i915_vma_pin(vma, 0, 0, flags);
+ if (err) {
+ i915_vma_close(vma);
+ goto out_unpin;
+ }
+
+ GEM_BUG_ON(obj->mm.page_sizes.gtt);
+ GEM_BUG_ON(!vma->page_sizes.sg);
+ GEM_BUG_ON(!vma->page_sizes.phys);
+
+ if (vma->page_sizes.sg & I915_GTT_PAGE_SIZE_2M) {
+ if (vma->page_sizes.gtt != size) {
+ dma_addr_t addr =
+ i915_gem_object_get_dma_address(obj, 0);
+
+ /* The only valid reason for this to ever fail
+ * would be if the dma-mapper screwed us over
+ * when we did the dma_map_sg(), since it has
+ * the final say over the dma address.
+ */
+ GEM_BUG_ON(IS_ALIGNED(addr,
+ I915_GTT_PAGE_SIZE_2M));
+ pr_info("dma address unaligned\n");
+ }
+
+ GEM_BUG_ON(!IS_ALIGNED(vma->node.start,
+ I915_GTT_PAGE_SIZE_2M));
+ }
+
+ if (vma->page_sizes.sg & I915_GTT_PAGE_SIZE_64K) {
+ GEM_BUG_ON(!IS_ALIGNED(vma->node.size,
+ I915_GTT_PAGE_SIZE_2M));
+ }
+
+ i915_vma_unpin(vma);
+ i915_vma_close(vma);
+
+ i915_gem_object_unpin_pages(obj);
+ i915_gem_object_put(obj);
+ }
+
+ return 0;
+
+out_unpin:
+ i915_gem_object_unpin_pages(obj);
+out_put:
+ i915_gem_object_put(obj);
+
+ return err;
+}
+
+int i915_gem_huge_page_mock_selftests(void)
+{
+ static const struct i915_subtest tests[] = {
+ SUBTEST(igt_mock_exhaust_device_supported_pages),
+ SUBTEST(igt_mock_ppgtt_misaligned_dma),
+ SUBTEST(igt_mock_ppgtt_huge_fill),
+ SUBTEST(igt_mock_ppgtt_64K),
+ };
+ int saved_ppgtt = i915.enable_ppgtt;
+ struct drm_i915_private *dev_priv;
+ struct pci_dev *pdev;
+ struct i915_hw_ppgtt *ppgtt;
+ int err;
+
+ dev_priv = mock_gem_device();
+ if (!dev_priv)
+ return -ENOMEM;
+
+ /* Pretend to be a device which supports the 48b PPGTT */
+ i915.enable_ppgtt = 3;
+
+ pdev = dev_priv->drm.pdev;
+ dma_coerce_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(39));
+
+ mutex_lock(&dev_priv->drm.struct_mutex);
+ ppgtt = i915_ppgtt_create(dev_priv, ERR_PTR(-ENODEV), "mock");
+ if (IS_ERR(ppgtt)) {
+ err = PTR_ERR(ppgtt);
+ goto out_unlock;
+ }
+
+ GEM_BUG_ON(!i915_vm_is_48bit(&ppgtt->base));
+
+ err = i915_subtests(tests, ppgtt);
+
+ i915_ppgtt_close(&ppgtt->base);
+ i915_ppgtt_put(ppgtt);
+
+out_unlock:
+ mutex_unlock(&dev_priv->drm.struct_mutex);
+
+ i915.enable_ppgtt = saved_ppgtt;
+
+ drm_dev_unref(&dev_priv->drm);
+
+ return err;
+}
+
+int i915_gem_huge_page_live_selftests(struct drm_i915_private *dev_priv)
+{
+ static const struct i915_subtest tests[] = {
+ SUBTEST(igt_ppgtt_gemfs_huge),
+ SUBTEST(igt_ppgtt_pin_update),
+ SUBTEST(igt_ppgtt_write_huge),
+ };
+ int err;
+
+ if (!USES_PPGTT(dev_priv)) {
+ pr_info("PPGTT not supported, skipping live-selftests\n");
+ return 0;
+ }
+
+ mutex_lock(&dev_priv->drm.struct_mutex);
+ err = i915_subtests(tests, dev_priv);
+ mutex_unlock(&dev_priv->drm.struct_mutex);
+
+ return err;
+}
diff --git a/drivers/gpu/drm/i915/selftests/i915_live_selftests.h b/drivers/gpu/drm/i915/selftests/i915_live_selftests.h
index 18b174d855ca..64acd7eccc5c 100644
--- a/drivers/gpu/drm/i915/selftests/i915_live_selftests.h
+++ b/drivers/gpu/drm/i915/selftests/i915_live_selftests.h
@@ -15,5 +15,6 @@ selftest(objects, i915_gem_object_live_selftests)
selftest(dmabuf, i915_gem_dmabuf_live_selftests)
selftest(coherency, i915_gem_coherency_live_selftests)
selftest(gtt, i915_gem_gtt_live_selftests)
+selftest(hugepages, i915_gem_huge_page_live_selftests)
selftest(contexts, i915_gem_context_live_selftests)
selftest(hangcheck, intel_hangcheck_live_selftests)
diff --git a/drivers/gpu/drm/i915/selftests/i915_mock_selftests.h b/drivers/gpu/drm/i915/selftests/i915_mock_selftests.h
index fc74687501ba..9961b44f76ed 100644
--- a/drivers/gpu/drm/i915/selftests/i915_mock_selftests.h
+++ b/drivers/gpu/drm/i915/selftests/i915_mock_selftests.h
@@ -21,3 +21,4 @@ selftest(dmabuf, i915_gem_dmabuf_mock_selftests)
selftest(vma, i915_vma_mock_selftests)
selftest(evict, i915_gem_evict_mock_selftests)
selftest(gtt, i915_gem_gtt_mock_selftests)
+selftest(hugepages, i915_gem_huge_page_mock_selftests)