This patchset attempts to fix some errors in udmabuf and remove the upin_list structure. Some of this fix just gather the patches which I upload before. Patch 1,2,4,5 has passed the udmabuf self-test suite's tests. Suggested by Kasireddy, Vivek <vivek.kasireddy@xxxxxxxxx> Patch5 modified the unpin function, therefore running the udmabuf self-test program in a loop did not reveal any memory leaks. Notice: Test item 6 maybe requires running the command: echo 1024 > /sys/kernel/mm/hugepages/hugepages-2048kB/nr_hugepages Patch1 === mmap just pre-fault when the first access test this by look run create udmabuf size 3GB, then only record the "mmap -> memset"'s time. This average show 1.2s cost compare to direct map when mmap, this also show 1.2s cost. environment: archlinux, linux-next, 16G, 4 core. Patch2 === This is the same to patch: https://lore.kernel.org/all/20240725021349.580574-1-link@xxxxxxxx/ Patch3 === fix current implementation of udmabuf's vmap issues, use pfn. Patch4 === Change codestyle and fix a potential bug. Patch5 === Attempt to remove unpin_list and other related data structures. Changelog === v4 -> v3: Patch1 fill vma area with pfn only when true access. Patch2 no change Patch3 select VMAP_PFN Patch4 use function pin each item. Patch5 use pinned folio array instead udmabuf_folio struct. v2 -> v3: Patch1, avoid use page, instead, use pfn, and use vmf_insert_pfn map suggested-by Kasireddy, Vivek <vivek.kasireddy@xxxxxxxxx> Patch2, update acked-by Kasireddy, Vivek <vivek.kasireddy@xxxxxxxxx> And keep the kvcalloc on the same line. Patch3, avoid use page, instead, use pfn, then use vmap_pfn map Patch4, split v2 patch4, single update codestyle to keep review easy. Patch5, another way to remove udmabuf_folio --- v1 -> v2: Patch1, 3 Rectify the improper use of the sg table. suggested-by Christian König <christian.koenig@xxxxxxx> Patch2 add acked-by Christian K�nig <christian.koenig@xxxxxxx> which marked in v1 Patch4 Modify the data structure to restore the use of pages and correct the misunderstanding of loop conditions such as "pgcnt". make sure pass self test. remove v1's patch4 v3 https://lore.kernel.org/all/20240813090518.3252469-1-link@xxxxxxxx/ v2 https://lore.kernel.org/all/20240805032550.3912454-1-link@xxxxxxxx/ v1 https://lore.kernel.org/all/20240801104512.4056860-1-link@xxxxxxxx/ Huan Yang (5): udmabuf: direct map pfn when first page fault udmabuf: change folios array from kmalloc to kvmalloc udmabuf: fix vmap_udmabuf error page set udmabuf: udmabuf_create codestyle cleanup udmabuf: remove udmabuf_folio drivers/dma-buf/Kconfig | 1 + drivers/dma-buf/udmabuf.c | 281 +++++++++++++++++++++++--------------- 2 files changed, 172 insertions(+), 110 deletions(-) base-commit: 6a7917c89f219f09b1d88d09f376000914a52763 -- 2.45.2
