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19e8bc9456
There's no reason for panthor_vm_[un]map_pages() to fail unless the drm_gpuvm state and the page table are out of sync, so let's reflect that by making panthor_vm_unmap_pages() a void function and adding WARN_ON()s in various places. We also try to recover from those unexpected mismatch by checking for already unmapped ranges and skipping them. But there's only so much we can do to try and cope with such SW bugs, so when we see a mismatch, we flag the VM unusable and disable the AS to avoid further GPU accesses to the memory. It could be that the as_disable() call fails because the MMU unit is stuck, in which case the whole GPU is frozen, and only a GPU reset can unblock things. Ater the reset, the VM will be seen as unusable and any attempt to re-use it will fail, so we should be covered for any use-after-unmap issues. v2: - Fix double unlock v3: - Collect R-b v4: - No changes Reviewed-by: Steven Price <steven.price@arm.com> Link: https://patch.msgid.link/20251128084841.3804658-6-boris.brezillon@collabora.com Signed-off-by: Boris Brezillon <boris.brezillon@collabora.com> |
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.