search for: dmirror_bounce

...PAGE_SHIFT), end); > + > + ret = dmirror_range_fault(dmirror, &range); > + if (ret) > + break; > + } > + > + mmput(mm); > + return ret; > +} > + > +static int dmirror_do_read(struct dmirror *dmirror, unsigned long start, > + unsigned long end, struct dmirror_bounce *bounce) > +{ > + unsigned long pfn; > + void *ptr; > + > + ptr = bounce->ptr + ((start - bounce->addr) & PAGE_MASK); > + > + for (pfn = start >> PAGE_SHIFT; pfn < (end >> PAGE_SHIFT); pfn++) { > + void *entry; > + struct page *page; > + voi...

On 3/17/20 5:59 AM, Christoph Hellwig wrote: > On Tue, Mar 17, 2020 at 09:47:55AM -0300, Jason Gunthorpe wrote: >> I've been using v7 of Ralph's tester and it is working well - it has >> DEVICE_PRIVATE support so I think it can test this flow too. Ralph are >> you able? >> >> This hunk seems trivial enough to me, can we include it now? > > I can send

These changes are based on Jason's latest hmm branch. Patch 1 was previously posted here [1] but was dropped from the orginal series. Hopefully, the tests will reduce concerns about edge conditions. I'm sure more tests could be usefully added but I thought this was a good starting point. [1] https://lore.kernel.org/linux-mm/20190726005650.2566-6-rcampbell at nvidia.com/ Ralph Campbell

...dmirror_range_fault(dmirror, &range); >> + if (ret) >> + break; >> + } >> + >> + mmput(mm); >> + return ret; >> +} >> + >> +static int dmirror_do_read(struct dmirror *dmirror, unsigned long start, >> + unsigned long end, struct dmirror_bounce *bounce) >> +{ >> + unsigned long pfn; >> + void *ptr; >> + >> + ptr = bounce->ptr + ((start - bounce->addr) & PAGE_MASK); >> + >> + for (pfn = start >> PAGE_SHIFT; pfn < (end >> PAGE_SHIFT); pfn++) { >> + void *entry; >&g...

This series adds new functions to the mmu interval notifier API to allow device drivers with MMUs to dynamically mirror a process' page tables based on device faults and invalidation callbacks. The Nouveau driver is updated to use the extended API and a set of stand alone self tests is added to help validate and maintain correctness. The patches are based on linux-5.5.0-rc6 and are for

...rror_migrate(struct dmirror *dmirror, unsigned long size = cmd->npages << PAGE_SHIFT; struct mm_struct *mm = dmirror->notifier.mm; struct vm_area_struct *vma; - unsigned long src_pfns[64]; - unsigned long dst_pfns[64]; + unsigned long *src_pfns; + unsigned long *dst_pfns; struct dmirror_bounce bounce; struct migrate_vma args; unsigned long next; @@ -698,6 +813,17 @@ static int dmirror_migrate(struct dmirror *dmirror, if (!mmget_not_zero(mm)) return -EINVAL; + src_pfns = kmalloc_array(PTRS_PER_PTE, sizeof(*src_pfns), GFP_KERNEL); + if (!src_pfns) { + ret = -ENOMEM; + goto out...

This series adds support for transparent huge page migration to migrate_vma_*() and adds nouveau SVM and HMM selftests as consumers. Earlier versions were posted previously [1] and [2]. The patches apply cleanly to the linux-mm 5.10.0-rc2 tree. There are a lot of other THP patches being posted. I don't think there are any semantic conflicts but there may be some merge conflicts depending on

This series adds support for transparent huge page migration to migrate_vma_*() and adds nouveau SVM and HMM selftests as consumers. An earlier version was posted previously [1]. This version now supports splitting a THP midway in the migration process which led to a number of changes. The patches apply cleanly to the current linux-mm tree. Since there are a couple of patches in linux-mm from Dan

...the simplified format. I would appreciated tested-by's for the two drivers, thanks! This passes the hmm tester with the following diff: diff --git a/lib/test_hmm.c b/lib/test_hmm.c index d75e18f2ffd245..a2442efa038c41 100644 --- a/lib/test_hmm.c +++ b/lib/test_hmm.c @@ -47,23 +47,8 @@ struct dmirror_bounce { unsigned long cpages; }; -#define DPT_SHIFT PAGE_SHIFT -#define DPT_VALID (1UL << 0) -#define DPT_WRITE (1UL << 1) - #define DPT_XA_TAG_WRITE 3UL -static const uint64_t dmirror_hmm_flags[HMM_PFN_FLAG_MAX] = { - [HMM_PFN_VALID] = DPT_VALID, - [HMM_PFN_WRITE] = DPT_WRITE, -}; -...

These patches apply to linux-5.8.0-rc1. Patches 1-3 should probably go into 5.8, the others can be queued for 5.9. Patches 4-6 improve the HMM self tests. Patch 7-8 prepare nouveau for the meat of this series which adds support and testing for compound page mapping of system memory (patches 9-11) and compound page migration to device private memory (patches 12-16). Since these changes are split