[PATCH 22/68] drm/i915: Create a fake object for testing huge allocations
Chris Wilson
chris at chris-wilson.co.uk
Fri Jan 13 07:43:49 UTC 2017
We would like to be able to exercise huge allocations even on memory
constrained devices. To do this we create an object that allocates only
a few pages and remaps them across its whole range - each page is reused
multiple times. We can therefore pretend we are rendering into a much
larger object.
Signed-off-by: Chris Wilson <chris at chris-wilson.co.uk>
---
drivers/gpu/drm/i915/i915_gem.c | 1 +
drivers/gpu/drm/i915/i915_gem_object.h | 20 ++--
drivers/gpu/drm/i915/selftests/huge_gem_object.c | 130 +++++++++++++++++++++++
drivers/gpu/drm/i915/selftests/huge_gem_object.h | 33 ++++++
4 files changed, 176 insertions(+), 8 deletions(-)
create mode 100644 drivers/gpu/drm/i915/selftests/huge_gem_object.c
create mode 100644 drivers/gpu/drm/i915/selftests/huge_gem_object.h
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index d96604a84003..b4fa0cbf076e 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -4893,4 +4893,5 @@ i915_gem_object_get_dma_address(struct drm_i915_gem_object *obj,
#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
#include "selftests/scatterlist.c"
#include "selftests/mock_gem_device.c"
+#include "selftests/huge_gem_object.c"
#endif
diff --git a/drivers/gpu/drm/i915/i915_gem_object.h b/drivers/gpu/drm/i915/i915_gem_object.h
index 290eaa7fc9eb..4114cc8a0b9b 100644
--- a/drivers/gpu/drm/i915/i915_gem_object.h
+++ b/drivers/gpu/drm/i915/i915_gem_object.h
@@ -167,14 +167,18 @@ struct drm_i915_gem_object {
/** Record of address bit 17 of each page at last unbind. */
unsigned long *bit_17;
- struct i915_gem_userptr {
- uintptr_t ptr;
- unsigned read_only :1;
-
- struct i915_mm_struct *mm;
- struct i915_mmu_object *mmu_object;
- struct work_struct *work;
- } userptr;
+ union {
+ struct i915_gem_userptr {
+ uintptr_t ptr;
+ unsigned read_only :1;
+
+ struct i915_mm_struct *mm;
+ struct i915_mmu_object *mmu_object;
+ struct work_struct *work;
+ } userptr;
+
+ unsigned long scratch;
+ };
/** for phys allocated objects */
struct drm_dma_handle *phys_handle;
diff --git a/drivers/gpu/drm/i915/selftests/huge_gem_object.c b/drivers/gpu/drm/i915/selftests/huge_gem_object.c
new file mode 100644
index 000000000000..df00e14ce8bc
--- /dev/null
+++ b/drivers/gpu/drm/i915/selftests/huge_gem_object.c
@@ -0,0 +1,130 @@
+/*
+ * Copyright © 2016 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 "huge_gem_object.h"
+
+static void huge_free_pages(struct drm_i915_gem_object *obj,
+ struct sg_table *pages)
+{
+ unsigned long nreal = obj->scratch / PAGE_SIZE;
+ struct scatterlist *sg;
+
+ for (sg = pages->sgl; sg && nreal--; sg = ____sg_next(sg))
+ __free_page(sg_page(sg));
+
+ sg_free_table(pages);
+ kfree(pages);
+}
+
+static struct sg_table *
+huge_get_pages(struct drm_i915_gem_object *obj)
+{
+#define GFP (GFP_KERNEL | __GFP_NOWARN | __GFP_NORETRY)
+ const unsigned long nreal = obj->scratch / PAGE_SIZE;
+ const unsigned long npages = obj->base.size / PAGE_SIZE;
+ struct scatterlist *sg, *src, *end;
+ struct sg_table *pages;
+ unsigned long n;
+
+ pages = kmalloc(sizeof(*pages), GFP);
+ if (!pages)
+ return ERR_PTR(-ENOMEM);
+
+ if (sg_alloc_table(pages, npages, GFP)) {
+ kfree(pages);
+ return ERR_PTR(-ENOMEM);
+ }
+
+ sg = pages->sgl;
+ for (n = 0; n < nreal; n++) {
+ struct page *page;
+
+ page = alloc_page(GFP | __GFP_HIGHMEM);
+ if (!page) {
+ sg_mark_end(sg);
+ goto err;
+ }
+
+ sg_set_page(sg, page, PAGE_SIZE, 0);
+ sg = ____sg_next(sg);
+ }
+ if (nreal < npages) {
+ for (end = sg, src = pages->sgl; sg; sg = __sg_next(sg)) {
+ sg_set_page(sg, sg_page(src), PAGE_SIZE, 0);
+ src = ____sg_next(src);
+ if (src == end)
+ src = pages->sgl;
+ }
+ }
+
+ if (i915_gem_gtt_prepare_pages(obj, pages))
+ goto err;
+
+ return pages;
+
+err:
+ huge_free_pages(obj, pages);
+ return ERR_PTR(-ENOMEM);
+#undef GFP
+}
+
+static void huge_put_pages(struct drm_i915_gem_object *obj,
+ struct sg_table *pages)
+{
+ i915_gem_gtt_finish_pages(obj, pages);
+ huge_free_pages(obj, pages);
+
+ obj->mm.dirty = false;
+}
+
+static const struct drm_i915_gem_object_ops huge_ops = {
+ .flags = I915_GEM_OBJECT_HAS_STRUCT_PAGE |
+ I915_GEM_OBJECT_IS_SHRINKABLE,
+ .get_pages = huge_get_pages,
+ .put_pages = huge_put_pages,
+};
+
+struct drm_i915_gem_object *
+huge_gem_object(struct drm_i915_private *i915,
+ unsigned long real_size,
+ unsigned long total_size)
+{
+ struct drm_i915_gem_object *obj;
+
+ GEM_BUG_ON(!real_size || real_size > total_size);
+
+ obj = i915_gem_object_alloc(i915);
+ if (!obj)
+ return ERR_PTR(-ENOMEM);
+
+ drm_gem_private_object_init(&i915->drm, &obj->base, total_size);
+ i915_gem_object_init(obj, &huge_ops);
+
+ obj->base.write_domain = I915_GEM_DOMAIN_CPU;
+ obj->base.read_domains = I915_GEM_DOMAIN_CPU;
+ obj->cache_level = HAS_LLC(i915) ? I915_CACHE_LLC : I915_CACHE_NONE;
+ obj->scratch = real_size;
+
+ return obj;
+}
diff --git a/drivers/gpu/drm/i915/selftests/huge_gem_object.h b/drivers/gpu/drm/i915/selftests/huge_gem_object.h
new file mode 100644
index 000000000000..0d80f0f70bbc
--- /dev/null
+++ b/drivers/gpu/drm/i915/selftests/huge_gem_object.h
@@ -0,0 +1,33 @@
+/*
+ * Copyright © 2016 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.
+ *
+ */
+
+#ifndef __HUGE_GEM_OBJECT_H
+#define __HUGE_GEM_OBJECT_H
+
+struct drm_i915_gem_object *
+huge_gem_object(struct drm_i915_private *i915,
+ unsigned long real_size,
+ unsigned long total_size);
+
+#endif /* !__HUGE_GEM_OBJECT_H */
--
2.11.0
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