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FROM_EQ_ENVFROM(0.00)[]; FROM_HAS_DN(0.00)[]; TO_DN_SOME(0.00)[]; MID_RHS_MATCH_FROM(0.00)[]; RECEIVED_SPAMHAUS_BLOCKED_OPENRESOLVER(0.00)[2a07:de40:b281:106:10:150:64:167:received]; RCPT_COUNT_SEVEN(0.00)[9]; RCVD_VIA_SMTP_AUTH(0.00)[]; TAGGED_RCPT(0.00)[]; DBL_BLOCKED_OPENRESOLVER(0.00)[imap1.dmz-prg2.suse.org:rdns,imap1.dmz-prg2.suse.org:helo,suse.com:url,suse.de:mid,suse.de:dkim,bootlin.com:url] X-Rspamd-Server: rspamd1.dmz-prg2.suse.org Hi Am 03.07.26 um 08:34 schrieb José Expósito: > Two drm_gem_shmem KUnit tests, drm_gem_shmem_test_get_pages_sgt() and > drm_gem_shmem_test_purge(), intermittently fail on ppc64le and s390x CI > with a DMA address overflow warning followed by -EIO: > > DMA addr 0x00000001130b0000+65536 overflow (mask ffffffff, bus limit 0). > Expected sgt is not error, but is: -5 > > Both tests call `drm_gem_shmem_get_pages_sgt()`, which internally pins > backing pages and DMA-maps them via `dma_map_sgtable()`. The DMA mapping > path is: > > drm_gem_shmem_test_purge() > drm_gem_shmem_get_pages_sgt() > drm_gem_shmem_get_pages_sgt_locked() [drm_gem_shmem_helper.c] > dma_map_sgtable() [mapping.c] > __dma_map_sg_attrs() > dma_direct_map_sg() [direct.c] > dma_direct_map_phys() [kernel/dma/direct.h] > dma_capable() Checks addr against DMA mask > -> FAILS: addr > 0xFFFFFFFF > > KUnit devices are initialized with a 32-bit DMA mask > (`DMA_BIT_MASK(32)`) in `lib/kunit/device.c`. On systems where the kernel > allocates backing pages at physical addresses above 4GB, `dma_capable()` > returns false because the address exceeds the 32-bit mask. The `dma_set_mask()` > function updates `*dev->dma_mask` to the given value; setting it to > `DMA_BIT_MASK(64)` allows any physical address to pass the check. > > The failure is intermittent because pages may or may not be allocated > above 4GB on any given run depend on memory pressure. > > A third test in the same suite, `drm_gem_shmem_test_obj_create_private`, > already calls `dma_set_mask(drm_dev->dev, DMA_BIT_MASK(64))` before its > DMA mapping. This series applies the same fix to the two remaining tests. Instead of doing whack-a-mole, is it possible to move the existing fix from drm_gem_shmem_test_obj_create_private() to _test_init at [1] ? The DMA mask would then be the same on all tests. [1] https://elixir.bootlin.com/linux/v7.1.2/source/drivers/gpu/drm/tests/drm_gem_shmem_test.c#L359 Best regards Thomas > > José Expósito (2): > drm/tests: shmem: Set DMA mask to 64-bit in > drm_gem_shmem_test_get_pages_sgt > drm/tests: shmem: Set DMA mask to 64-bit in drm_gem_shmem_test_purge > > drivers/gpu/drm/tests/drm_gem_shmem_test.c | 9 ++++++++- > 1 file changed, 8 insertions(+), 1 deletion(-) > -- -- Thomas Zimmermann Graphics Driver Developer SUSE Software Solutions Germany GmbH Frankenstr. 146, 90461 Nürnberg, Germany, www.suse.com GF: Jochen Jaser, Andrew McDonald, Werner Knoblich, (HRB 36809, AG Nürnberg)