diff --git a/drivers/gpu/drm/i915/Kconfig.debug b/drivers/gpu/drm/i915/Kconfig.debug
index 1cb28c20807c59d3b61d78eb0895732dceccf760..25cd9788a4d54b13b341de260ac27fe2c315450e 100644
--- a/drivers/gpu/drm/i915/Kconfig.debug
+++ b/drivers/gpu/drm/i915/Kconfig.debug
@@ -153,6 +153,7 @@ config DRM_I915_SELFTEST
select DRM_EXPORT_FOR_TESTS if m
select FAULT_INJECTION
select PRIME_NUMBERS
+ select CRC32
help
Choose this option to allow the driver to perform selftests upon
loading; also requires the i915.selftest=1 module parameter. To
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_stolen.c b/drivers/gpu/drm/i915/gem/i915_gem_stolen.c
index 9e0e3cd616fd81016fe81e42ac84f9df26681f7d..78f64a2724e2abdddceebced8b448e12bd72fd7b 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_stolen.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_stolen.c
@@ -53,8 +53,10 @@ int i915_gem_stolen_insert_node(struct drm_i915_private *i915,
struct drm_mm_node *node, u64 size,
unsigned alignment)
{
- return i915_gem_stolen_insert_node_in_range(i915, node, size,
- alignment, 0, U64_MAX);
+ return i915_gem_stolen_insert_node_in_range(i915, node,
+ size, alignment,
+ I915_GEM_STOLEN_BIAS,
+ U64_MAX);
}
void i915_gem_stolen_remove_node(struct drm_i915_private *i915,
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_stolen.h b/drivers/gpu/drm/i915/gem/i915_gem_stolen.h
index e15c0adad8af1e8acd7f4bca396ad53bb22bafc3..61e028063f9fb0638fc3d3355177dacc51d8c160 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_stolen.h
+++ b/drivers/gpu/drm/i915/gem/i915_gem_stolen.h
@@ -30,4 +30,6 @@ i915_gem_object_create_stolen_for_preallocated(struct drm_i915_private *dev_priv
resource_size_t stolen_offset,
resource_size_t size);
+#define I915_GEM_STOLEN_BIAS SZ_128K
+
#endif /* __I915_GEM_STOLEN_H__ */
diff --git a/drivers/gpu/drm/i915/gt/selftest_reset.c b/drivers/gpu/drm/i915/gt/selftest_reset.c
index 35406ecdf0b2a9bd61b53f96e6fbd0b657b40a6c..ef5aeebbeeb066fa7ee92622d0cb8d8560c48c90 100644
--- a/drivers/gpu/drm/i915/gt/selftest_reset.c
+++ b/drivers/gpu/drm/i915/gt/selftest_reset.c
@@ -3,9 +3,203 @@
* Copyright © 2018 Intel Corporation
*/
+#include <linux/crc32.h>
+
+#include "gem/i915_gem_stolen.h"
+
+#include "i915_memcpy.h"
#include "i915_selftest.h"
#include "selftests/igt_reset.h"
#include "selftests/igt_atomic.h"
+#include "selftests/igt_spinner.h"
+
+static int
+__igt_reset_stolen(struct intel_gt *gt,
+ intel_engine_mask_t mask,
+ const char *msg)
+{
+ struct i915_ggtt *ggtt = >->i915->ggtt;
+ const struct resource *dsm = >->i915->dsm;
+ resource_size_t num_pages, page;
+ struct intel_engine_cs *engine;
+ intel_wakeref_t wakeref;
+ enum intel_engine_id id;
+ struct igt_spinner spin;
+ long max, count;
+ void *tmp;
+ u32 *crc;
+ int err;
+
+ if (!drm_mm_node_allocated(&ggtt->error_capture))
+ return 0;
+
+ num_pages = resource_size(dsm) >> PAGE_SHIFT;
+ if (!num_pages)
+ return 0;
+
+ crc = kmalloc_array(num_pages, sizeof(u32), GFP_KERNEL);
+ if (!crc)
+ return -ENOMEM;
+
+ tmp = kmalloc(PAGE_SIZE, GFP_KERNEL);
+ if (!tmp) {
+ err = -ENOMEM;
+ goto err_crc;
+ }
+
+ igt_global_reset_lock(gt);
+ wakeref = intel_runtime_pm_get(gt->uncore->rpm);
+
+ err = igt_spinner_init(&spin, gt);
+ if (err)
+ goto err_lock;
+
+ for_each_engine(engine, gt, id) {
+ struct intel_context *ce;
+ struct i915_request *rq;
+
+ if (!(mask & engine->mask))
+ continue;
+
+ if (!intel_engine_can_store_dword(engine))
+ continue;
+
+ ce = intel_context_create(engine);
+ if (IS_ERR(ce)) {
+ err = PTR_ERR(ce);
+ goto err_spin;
+ }
+ rq = igt_spinner_create_request(&spin, ce, MI_ARB_CHECK);
+ intel_context_put(ce);
+ if (IS_ERR(rq)) {
+ err = PTR_ERR(rq);
+ goto err_spin;
+ }
+ i915_request_add(rq);
+ }
+
+ for (page = 0; page < num_pages; page++) {
+ dma_addr_t dma = (dma_addr_t)dsm->start + (page << PAGE_SHIFT);
+ void __iomem *s;
+ void *in;
+
+ ggtt->vm.insert_page(&ggtt->vm, dma,
+ ggtt->error_capture.start,
+ I915_CACHE_NONE, 0);
+ mb();
+
+ s = io_mapping_map_wc(&ggtt->iomap,
+ ggtt->error_capture.start,
+ PAGE_SIZE);
+
+ if (!__drm_mm_interval_first(>->i915->mm.stolen,
+ page << PAGE_SHIFT,
+ ((page + 1) << PAGE_SHIFT) - 1))
+ memset32(s, STACK_MAGIC, PAGE_SIZE / sizeof(u32));
+
+ in = s;
+ if (i915_memcpy_from_wc(tmp, s, PAGE_SIZE))
+ in = tmp;
+ crc[page] = crc32_le(0, in, PAGE_SIZE);
+
+ io_mapping_unmap(s);
+ }
+ mb();
+ ggtt->vm.clear_range(&ggtt->vm, ggtt->error_capture.start, PAGE_SIZE);
+
+ if (mask == ALL_ENGINES) {
+ intel_gt_reset(gt, mask, NULL);
+ } else {
+ for_each_engine(engine, gt, id) {
+ if (mask & engine->mask)
+ intel_engine_reset(engine, NULL);
+ }
+ }
+
+ max = -1;
+ count = 0;
+ for (page = 0; page < num_pages; page++) {
+ dma_addr_t dma = (dma_addr_t)dsm->start + (page << PAGE_SHIFT);
+ void __iomem *s;
+ void *in;
+ u32 x;
+
+ ggtt->vm.insert_page(&ggtt->vm, dma,
+ ggtt->error_capture.start,
+ I915_CACHE_NONE, 0);
+ mb();
+
+ s = io_mapping_map_wc(&ggtt->iomap,
+ ggtt->error_capture.start,
+ PAGE_SIZE);
+
+ in = s;
+ if (i915_memcpy_from_wc(tmp, s, PAGE_SIZE))
+ in = tmp;
+ x = crc32_le(0, in, PAGE_SIZE);
+
+ if (x != crc[page] &&
+ !__drm_mm_interval_first(>->i915->mm.stolen,
+ page << PAGE_SHIFT,
+ ((page + 1) << PAGE_SHIFT) - 1)) {
+ pr_debug("unused stolen page %pa modified by GPU reset\n",
+ &page);
+ if (count++ == 0)
+ igt_hexdump(in, PAGE_SIZE);
+ max = page;
+ }
+
+ io_mapping_unmap(s);
+ }
+ mb();
+ ggtt->vm.clear_range(&ggtt->vm, ggtt->error_capture.start, PAGE_SIZE);
+
+ if (count > 0) {
+ pr_info("%s reset clobbered %ld pages of stolen, last clobber at page %ld\n",
+ msg, count, max);
+ }
+ if (max >= I915_GEM_STOLEN_BIAS >> PAGE_SHIFT) {
+ pr_err("%s reset clobbered unreserved area [above %x] of stolen; may cause severe faults\n",
+ msg, I915_GEM_STOLEN_BIAS);
+ err = -EINVAL;
+ }
+
+err_spin:
+ igt_spinner_fini(&spin);
+
+err_lock:
+ intel_runtime_pm_put(gt->uncore->rpm, wakeref);
+ igt_global_reset_unlock(gt);
+
+ kfree(tmp);
+err_crc:
+ kfree(crc);
+ return err;
+}
+
+static int igt_reset_device_stolen(void *arg)
+{
+ return __igt_reset_stolen(arg, ALL_ENGINES, "device");
+}
+
+static int igt_reset_engines_stolen(void *arg)
+{
+ struct intel_gt *gt = arg;
+ struct intel_engine_cs *engine;
+ enum intel_engine_id id;
+ int err;
+
+ if (!intel_has_reset_engine(gt))
+ return 0;
+
+ for_each_engine(engine, gt, id) {
+ err = __igt_reset_stolen(gt, engine->mask, engine->name);
+ if (err)
+ return err;
+ }
+
+ return 0;
+}
static int igt_global_reset(void *arg)
{
@@ -164,6 +358,8 @@ int intel_reset_live_selftests(struct drm_i915_private *i915)
{
static const struct i915_subtest tests[] = {
SUBTEST(igt_global_reset), /* attempt to recover GPU first */
+ SUBTEST(igt_reset_device_stolen),
+ SUBTEST(igt_reset_engines_stolen),
SUBTEST(igt_wedged_reset),
SUBTEST(igt_atomic_reset),
SUBTEST(igt_atomic_engine_reset),