bac79d727a
Since not all devices require a 32-bit MSI address, add support to the PCIe host driver to allow setting the DMA mask to 64-bits if the 32-bit allocation fails. This allows kernels to disable ZONE_DMA32 and bounce buffering (swiotlb) without risking not being able to get a 32-bit address during DMA allocation. Basically, in the slim chance that there are no 32-bit allocations available, the current PCIe host driver will fail to allocate the msi_msg page due to a DMA address overflow (seen in [1]). With this patch, the PCIe host can retry the allocation with a 64-bit DMA mask if the current PCIe device advertises 64-bit support via its MSI capabilities. [1] https://lore.kernel.org/all/Yo0soniFborDl7+C@google.com/ Bug: 241473543 Link: https://lore.kernel.org/r/20220825235404.4132818-3-willmcvicker@google.com Reported-by: kernel test robot <lkp@intel.com> Signed-off-by: Will McVicker <willmcvicker@google.com> Signed-off-by: Lorenzo Pieralisi <lpieralisi@kernel.org> Reviewed-by: Rob Herring <robh@kernel.org> Acked-by: Jingoo Han <jingoohan1@gmail.com> Change-Id: I8936717b26f3dec453b0a944b26a0bb891905100 (cherry picked from commit e99d8c5e803b9a9f0b5a84165dad3b8895446147 https://git.kernel.org/pub/scm/linux/kernel/git/lpieralisi/pci.git pci/dwc)