accel/habanalabs: support mapping cb with vmalloc-backed coherent memory

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[ Upstream commit 513024d5a0 ]

When IOMMU is enabled, dma_alloc_coherent() with GFP_USER may return
addresses from the vmalloc range. If such an address is mapped without
VM_MIXEDMAP, vm_insert_page() will trigger a BUG_ON due to the
VM_PFNMAP restriction.

Fix this by checking for vmalloc addresses and setting VM_MIXEDMAP
in the VMA before mapping. This ensures safe mapping and avoids kernel
crashes. The memory is still driver-allocated and cannot be accessed
directly by userspace.

Signed-off-by: Moti Haimovski  <moti.haimovski@intel.com>
Reviewed-by: Koby Elbaz <koby.elbaz@intel.com>
Signed-off-by: Koby Elbaz <koby.elbaz@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>

...

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Moti Haimovski 2024-09-08 15:01:26 +03:00 • committed by Greg Kroah-Hartman

parent 7005921ad6

commit 73c7c2cdb4

2 changed files with 26 additions and 0 deletions

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19

drivers/accel/habanalabs/gaudi/gaudi.c

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7

drivers/accel/habanalabs/gaudi2/gaudi2.c

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