diff options
| author | Zbigniew Kempczyński <zbigniew.kempczynski@intel.com> | 2022-06-10 09:07:50 +0200 |
|---|---|---|
| committer | Zbigniew Kempczyński <zbigniew.kempczynski@intel.com> | 2022-06-13 17:28:24 +0200 |
| commit | d79613643c640e348a7291fbab3bfdddd48d068c (patch) | |
| tree | bb26a8551a47d73ea01040ec71a45195fb3b5f2c /docs | |
| parent | 3844434ae2bc013857d1aa90d12875151689164e (diff) | |
lib/i915_crc: Introduce crc32 on gpu for DG2
Adding crc32 calculation on gpu gives us new possibility to verify data
integrity without relying on trust cpu mapping is correct.
Patch introduces calculating crc32 on DG2 only. On older gens ALU
(MI_MATH) doesn't support bit-shifting instructions as well as multiply
or divide. Emulating n-bit shifts cost hundred of instructions with
predicated SRM (works on render engine only). Another limitation is lack
of indexed load / store. On DG2 we can use WPARID and CS_MI_ADDRESS_OFFSET
to achieve indexed operation on memory.
Due to performance reasons (cpu crc32 calculation even on WC memory is
still much faster than on gpu, also depends on calculated object memory
region) calculation will complete in reasonable of time only for few MiB.
v2: - use registers relative to engine to allow run on all engines (Chris)
- use predication instead of memory access to get better performance
(Chris)
- add location where crc32 implementation comes from (Petri)
v4: - use common crc32 table from igt_crc
- add docs
v5: - change BIT(n) to informative macros (Zbigniew)
Signed-off-by: Zbigniew Kempczyński <zbigniew.kempczynski@intel.com>
Acked-by: Petri Latvala <petri.latvala@intel.com>
Diffstat (limited to 'docs')
| -rw-r--r-- | docs/reference/igt-gpu-tools/igt-gpu-tools-docs.xml | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/docs/reference/igt-gpu-tools/igt-gpu-tools-docs.xml b/docs/reference/igt-gpu-tools/igt-gpu-tools-docs.xml index b78f1eb6..a19f786e 100644 --- a/docs/reference/igt-gpu-tools/igt-gpu-tools-docs.xml +++ b/docs/reference/igt-gpu-tools/igt-gpu-tools-docs.xml @@ -63,6 +63,7 @@ <xi:include href="xml/gem_scheduler.xml"/> <xi:include href="xml/gem_submission.xml"/> <xi:include href="xml/i915_blt.xml"/> + <xi:include href="xml/i915_crc.xml"/> <xi:include href="xml/intel_ctx.xml"/> </chapter> <xi:include href="xml/igt_test_programs.xml"/> |