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linux/drivers/gpu/drm/i915/selftests
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George Spelvin c43a87f537 drm/i915/selftests: Avoid passing a random 0 into ilog2 
igt_mm_config() calls ilog2() on the (pseudo)random 21-bit number
s>>12.  Once in 2 million seeds, this is zero and ilog2 summons
the nasal demons.

There was an attempt to handle this case with a max(), but that's
too late; ms could already be something bizarre.

Given that the low 12 bits of s and ms are always zero, it's a lot
simpler just to divide them by 4096, then everything fits into 32
bits, and we can easily generate a random number 1 <= s <= 0x1fffff.

Fixes: 14d1b9a624 ("drm/i915: buddy allocator")
Signed-off-by: George Spelvin <lkml@sdf.org>
Cc: Matthew Auld <matthew.auld@intel.com>
Cc: Jani Nikula <jani.nikula@linux.intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
Cc: intel-gfx@lists.freedesktop.org
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20200325192429.GA8865@SDF.ORG
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
(cherry picked from commit 21118e8e56)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
2020-08-19 15:23:36 +03:00
..
i915_active.c drm/i915: Allow for different modes of interruptible i915_active_wait 2020-03-30 18:20:33 +01:00
i915_buddy.c drm/i915/selftests: Avoid passing a random 0 into ilog2 2020-08-19 15:23:36 +03:00
i915_gem.c drm/i915/gt: Pull restoration of GGTT fences underneath the GT 2020-03-16 20:28:28 +00:00
i915_gem_evict.c drm/i915/gem: Drop cached obj->bind_count 2020-04-02 01:17:39 +01:00
i915_gem_gtt.c drm/i915/gem: Give each object class a friendly name 2020-05-29 23:38:29 +01:00
i915_live_selftests.h drm/i915: Fix comments mentioning typo in IS_ENABLED() 2020-06-05 16:28:42 +01:00
i915_mock_selftests.h drm/i915/gt: Incrementally check for rewinding 2020-06-16 11:34:23 +03:00
i915_perf.c drm/i915/selftest: Fix an error code in live_noa_gpr() 2020-07-14 18:16:15 +01:00
i915_perf_selftests.h drm/i915: Fix comments mentioning typo in IS_ENABLED() 2020-06-05 16:28:42 +01:00
i915_random.c drm/i915/selftests: Extract random_offset() for use with a prng 2019-10-02 15:30:44 +01:00
i915_random.h drm/i915: Add missing include file <linux/math64.h> 2020-01-07 14:04:31 +00:00
i915_request.c drm/i915: Move the engine mask to intel_gt_info 2020-07-08 21:07:11 +01:00
i915_selftest.c drm/i915/gem: Implement legacy MI_STORE_DATA_IMM 2020-05-04 15:15:04 +01:00
i915_sw_fence.c drm/i915/selftests: Disable preemption while setting up fence-timers 2019-03-14 11:47:06 +00:00
i915_syncmap.c drm/i915/selftests: Always initialise err 2017-11-14 23:50:49 +00:00
i915_vma.c drm/i915/execlists: Track inflight CCID 2020-04-28 22:17:36 +01:00
igt_atomic.c drm/i915/selftests: Move igt_atomic_section[] out of the header 2020-01-03 13:31:39 +00:00
igt_atomic.h drm/i915/selftests: Move igt_atomic_section[] out of the header 2020-01-03 13:31:39 +00:00
igt_flush_test.c drm/i915: Move request runtime management onto gt 2019-10-04 15:39:26 +01:00
igt_flush_test.h drm/i915: Drop struct_mutex from around i915_retire_requests() 2019-10-04 15:39:17 +01:00
igt_live_test.c drm/i915/selftests: Use GT engines in igt_live_test 2019-10-22 12:16:42 +01:00
igt_live_test.h drm/i915/selftests: Make headers self-contained 2020-01-03 13:33:36 +00:00
igt_mmap.c drm/i915/selftests: Wrap vm_mmap() around GEM objects 2019-11-07 21:22:58 +00:00
igt_mmap.h drm/i915/selftests: Wrap vm_mmap() around GEM objects 2019-11-07 21:22:58 +00:00
igt_reset.c drm/i915: Pass in intel_gt at some for_each_engine sites 2019-10-18 00:06:27 +01:00
igt_reset.h drm/i915/gt: Use intel_gt as the primary object for handling resets 2019-07-12 21:06:56 +01:00
igt_spinner.c drm/i915/selftests: Trim execlists runtime 2020-06-13 10:24:26 +01:00
igt_spinner.h drm/i915/selftests: Pass intel_context to igt_spinner 2019-07-31 09:45:27 +01:00
intel_memory_region.c drm/i915/selftests/perf: watch out for stolen objects 2020-03-23 11:52:34 +00:00
intel_uncore.c drm/i915/selftests: Move uncore fw selftests to operate on intel_gt 2019-10-22 20:44:52 +01:00
lib_sw_fence.c drm/i915: Propagate fence errors 2019-08-18 12:38:09 +01:00
lib_sw_fence.h treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 428 2019-06-05 17:37:16 +02:00
librapl.c drm/i915/selftests: Move gpu energy measurement into its own little lib 2020-04-17 18:48:51 +01:00
librapl.h drm/i915/selftests: Move gpu energy measurement into its own little lib 2020-04-17 18:48:51 +01:00
mock_drm.h drm/i915/selftests: make mock_drm.h self-contained 2019-12-23 12:38:43 +02:00
mock_gem_device.c drm/i915: Copy default modparams to mock i915_device 2020-08-19 15:23:07 +03:00
mock_gem_device.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
mock_gtt.c drm/i915: Export ppgtt_bind_vma 2020-07-03 15:14:35 +01:00
mock_gtt.h drm/i915: make more headers self-contained 2019-11-08 10:16:13 +00:00
mock_region.c drm/i915/gem: Give each object class a friendly name 2020-05-29 23:38:29 +01:00
mock_region.h drm/i915: make more headers self-contained 2019-11-08 10:16:13 +00:00
mock_request.c drm/i915/selftests: Pass intel_context to mock_request 2019-08-08 13:44:31 +01:00
mock_request.h drm/i915/selftests: Pass intel_context to mock_request 2019-08-08 13:44:31 +01:00
mock_uncore.c drm/i915/selftests: Assign the intel_runtime_pm pointer for mock_uncore 2019-10-08 16:21:50 +01:00
mock_uncore.h drm/i915: make more headers self-contained 2019-11-08 10:16:13 +00:00
scatterlist.c drm/i915: Pull scatterlist utils out of i915_gem.h 2019-05-28 12:45:29 +01:00