| Message ID | 20190709192418.GA13677@ziepe.ca (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [GIT,PULL] Please pull hmm changes | expand |
On Tue, Jul 9, 2019 at 12:24 PM Jason Gunthorpe <jgg@mellanox.com> wrote: > > I'm sending it early as it is now a dependency for several patches in > mm's quilt. .. but I waited to merge it until I had time to review it more closely, because I expected the review to be painful. I'm happy to say that I was overly pessimistic, and that instead of finding things to hate, I found it all looking good. Particularly the whole "use reference counts properly, so that lifetimes make sense and all those nasty cases can't happen" parts. It's all merged, just waiting for the test-build to verify that I didn't miss anything (well, at least nothing obvious). Linus
The pull request you sent on Tue, 9 Jul 2019 19:24:21 +0000:
> git://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma.git tags/for-linus-hmm
has been merged into torvalds/linux.git:
https://git.kernel.org/torvalds/c/fec88ab0af9706b2201e5daf377c5031c62d11f7
Thank you!
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c @@ -783,7 +783,7 @@ int amdgpu_ttm_tt_get_user_pages(struct ttm_tt *ttm, struct page **pages) 0 : range->flags[HMM_PFN_WRITE]; range->pfn_flags_mask = 0; range->pfns = pfns; - hmm_range_register(range, mm, start, + hmm_range_register(range, mirror, start, start + ttm->num_pages * PAGE_SIZE, PAGE_SHIFT); retry: - ARM64 has a patch series going through -mm with a trivial conflict ("Devmap cleanups + arm64 support"), Andrew has re-applied this in quilt onto linux-next and will send it - The memreap sub-section changes in -mm has 5 hunk conflict with the memremap changes here. Andrew reapplied Dan's series ontop of Christoph's series in linux-next and will send it. The tag for-linus-hmm-merged with my merge resolution to your tree is also available to pull. Thanks, Jason diff --cc mm/hmm.c index d48b9283725a90,f702a3895d05d8..e1eedef129cf5c --- a/mm/hmm.c
Hi Linus, As was discussed some time ago here are the mostly -mm patches related to hmm functions. In agreement with Andrew we split this out from quilt into a git topic branch so it can be shared between the DRM and RDMA git trees. However, this cycle did not see dependencies with work in DRM or RDMA that required a topic merge. I expect that work will start to get ready next cycle and we will see a need for a cross-tree topic merge then. I'm sending it early as it is now a dependency for several patches in mm's quilt. This has been an exciting topic branch for conflicts, you'll need the below simple resolution in the merge commit to make it compile (lockdep_assert_held_exclusive() was renamed to lockdep_assert_held_write()) Otherwise, for reference to all parties, here is how the conflicts were handled: - Several small patches from -mm quilt were moved to this tree to simplify conflict management, only Ira's 'fix release_pages()' patch was not hmm related. - DRM introduced a new users of the hmm_range_register() API. We worked with AMDGPU to ensure that their new user could use the revised API via the below trivial merge fixup with DRM: +++ b/mm/hmm.c @@@ -42,16 -54,11 +42,16 @@@ static const struct mmu_notifier_ops hm */ static struct hmm *hmm_get_or_create(struct mm_struct *mm) { - struct hmm *hmm = mm_get_hmm(mm); - bool cleanup = false; + struct hmm *hmm; - lockdep_assert_held_exclusive(&mm->mmap_sem); - if (hmm) - return hmm; ++ lockdep_assert_held_write(&mm->mmap_sem); + + /* Abuse the page_table_lock to also protect mm->hmm. */ + spin_lock(&mm->page_table_lock); + hmm = mm->hmm; + if (mm->hmm && kref_get_unless_zero(&mm->hmm->kref)) + goto out_unlock; + spin_unlock(&mm->page_table_lock); hmm = kmalloc(sizeof(*hmm), GFP_KERNEL); if (!hmm) @@@ -245,8 -277,8 +245,8 @@@ static const struct mmu_notifier_ops hm */ int hmm_mirror_register(struct hmm_mirror *mirror, struct mm_struct *mm) { - lockdep_assert_held_exclusive(&mm->mmap_sem); ++ lockdep_assert_held_write(&mm->mmap_sem); + /* Sanity check */ if (!mm || !mirror || !mirror->ops) return -EINVAL; The following changes since commit 6fbc7275c7a9ba97877050335f290341a1fd8dbf: Linux 5.2-rc7 (2019-06-30 11:25:36 +0800) are available in the Git repository at: git://git.kernel.org/pub/scm/linux/kernel/git/rdma/rdma.git tags/for-linus-hmm for you to fetch changes up to cc5dfd59e375f4d0f2b64643723d16b38b2f2d78: Merge branch 'hmm-devmem-cleanup.4' into rdma.git hmm (2019-07-02 15:10:45 -0300) ---------------------------------------------------------------- HMM patches for 5.3 Improvements and bug fixes for the hmm interface in the kernel: - Improve clarity, locking and APIs related to the 'hmm mirror' feature merged last cycle. In linux-next we now see AMDGPU and nouveau to be using this API. - Remove old or transitional hmm APIs. These are hold overs from the past with no users, or APIs that existed only to manage cross tree conflicts. There are still a few more of these cleanups that didn't make the merge window cut off. - Improve some core mm APIs: * export alloc_pages_vma() for driver use * refactor into devm_request_free_mem_region() to manage DEVICE_PRIVATE resource reservations * refactor duplicative driver code into the core dev_pagemap struct - Remove hmm wrappers of improved core mm APIs, instead have drivers use the simplified API directly - Remove DEVICE_PUBLIC - Simplify the kconfig flow for the hmm users and core code ---------------------------------------------------------------- Christoph Hellwig (24): mm: remove the unused ARCH_HAS_HMM_DEVICE Kconfig option mm: remove the struct hmm_device infrastructure mm: remove MEMORY_DEVICE_PUBLIC support mm: don't clear ->mapping in hmm_devmem_free mm: export alloc_pages_vma mm: factor out a devm_request_free_mem_region helper memremap: validate the pagemap type passed to devm_memremap_pages memremap: move dev_pagemap callbacks into a separate structure memremap: pass a struct dev_pagemap to ->kill and ->cleanup memremap: lift the devmap_enable manipulation into devm_memremap_pages memremap: add a migrate_to_ram method to struct dev_pagemap_ops memremap: remove the data field in struct dev_pagemap memremap: replace the altmap_valid field with a PGMAP_ALTMAP_VALID flag memremap: provide an optional internal refcount in struct dev_pagemap device-dax: use the dev_pagemap internal refcount PCI/P2PDMA: use the dev_pagemap internal refcount nouveau: use alloc_page_vma directly nouveau: use devm_memremap_pages directly mm: remove hmm_vma_alloc_locked_page mm: remove hmm_devmem_add mm: simplify ZONE_DEVICE page private data mm: sort out the DEVICE_PRIVATE Kconfig mess mm: remove the HMM config option mm: don't select MIGRATE_VMA_HELPER from HMM_MIRROR Ira Weiny (1): mm/swap: fix release_pages() when releasing devmap pages Jason Gunthorpe (15): mm/hmm.c: suppress compilation warnings when CONFIG_HUGETLB_PAGE is not set mm/hmm: fix use after free with struct hmm in the mmu notifiers mm/hmm: Use hmm_mirror not mm as an argument for hmm_range_register mm/hmm: Hold a mmgrab from hmm to mm mm/hmm: Simplify hmm_get_or_create and make it reliable mm/hmm: Remove duplicate condition test before wait_event_timeout mm/hmm: Do not use list*_rcu() for hmm->ranges mm/hmm: Hold on to the mmget for the lifetime of the range mm/hmm: Use lockdep instead of comments mm/hmm: Remove racy protection against double-unregistration mm/hmm: Poison hmm_range during unregister mm/hmm: Remove confusing comment and logic from hmm_release mm/hmm: Fix error flows in hmm_invalidate_range_start Merge tag 'v5.2-rc7' into rdma.git hmm Merge branch 'hmm-devmem-cleanup.4' into rdma.git hmm Kuehling, Felix (1): mm/hmm: Only set FAULT_FLAG_ALLOW_RETRY for non-blocking Philip Yang (1): mm/hmm: support automatic NUMA balancing Ralph Campbell (2): mm/hmm: update HMM documentation mm/hmm: clean up some coding style and comments Documentation/vm/hmm.rst | 166 ++++------ arch/powerpc/mm/mem.c | 10 +- arch/x86/mm/init_64.c | 8 +- drivers/dax/dax-private.h | 4 - drivers/dax/device.c | 41 +-- drivers/dax/pmem/core.c | 2 +- drivers/gpu/drm/nouveau/Kconfig | 6 +- drivers/gpu/drm/nouveau/nouveau_dmem.c | 103 +++--- drivers/gpu/drm/nouveau/nouveau_svm.c | 2 +- drivers/nvdimm/pfn_devs.c | 3 +- drivers/nvdimm/pmem.c | 51 ++- drivers/pci/p2pdma.c | 52 +-- fs/proc/task_mmu.c | 2 +- include/linux/hmm.h | 302 ++--------------- include/linux/ioport.h | 3 +- include/linux/memremap.h | 75 +++-- include/linux/mm.h | 28 +- include/linux/mm_types.h | 4 +- include/linux/swapops.h | 15 - kernel/fork.c | 1 - kernel/memremap.c | 194 ++++++----- kernel/resource.c | 39 +++ mm/Kconfig | 50 +-- mm/Makefile | 2 +- mm/gup.c | 7 - mm/hmm.c | 587 ++++++++------------------------- mm/madvise.c | 2 +- mm/memcontrol.c | 13 +- mm/memory-failure.c | 6 +- mm/memory.c | 49 +-- mm/memory_hotplug.c | 6 +- mm/mempolicy.c | 1 + mm/migrate.c | 28 +- mm/page_alloc.c | 13 +- mm/swap.c | 13 +- tools/testing/nvdimm/test/iomap.c | 57 +++- 36 files changed, 619 insertions(+), 1326 deletions(-) (diffstat from tag for-linus-hmm-merged)