iommufd follows the same design as KVM and uses memory cgroups to limit
the amount of kernel memory a iommufd file descriptor can pin down. The
various internal data structures already use GFP_KERNEL_ACCOUNT.
However, one of the biggest consumers of kernel memory is the IOPTEs
stored under the iommu_domain. Many drivers will allocate these at
iommu_map() time and will trivially do the right thing if we pass in
GFP_KERNEL_ACCOUNT.
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/5-v3-76b587fe28df+6e3-iommu_map_gfp_jgg@nvidia.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>
while (size) {
rc = iommu_map(domain, iova, paddr, PAGE_SIZE, prot,
- GFP_KERNEL);
+ GFP_KERNEL_ACCOUNT);
if (rc)
goto err_unmap;
iova += PAGE_SIZE;
rc = iommu_map(domain, iova,
PFN_PHYS(batch->pfns[cur]) + page_offset,
next_iova - iova, area->iommu_prot,
- GFP_KERNEL);
+ GFP_KERNEL_ACCOUNT);
if (rc)
goto err_unmap;
iova = next_iova;