search for: hmm_mirror_unregister

...AGAIN in that case. + */ +#define HMM_FAULT_ALLOW_RETRY (1 << 0) + +/* Don't fault in missing PTEs, just snapshot the current state. */ +#define HMM_FAULT_SNAPSHOT (1 << 1) + +#ifdef CONFIG_HMM_MIRROR int hmm_mirror_register(struct hmm_mirror *mirror, struct mm_struct *mm); void hmm_mirror_unregister(struct hmm_mirror *mirror); @@ -383,14 +390,6 @@ void hmm_mirror_unregister(struct hmm_mirror *mirror); int hmm_range_register(struct hmm_range *range, struct hmm_mirror *mirror); void hmm_range_unregister(struct hmm_range *range); -/* - * Retry fault if non-blocking, drop mmap_sem and return...

...... - * } - * - * Once an hmm_mirror is registered for an address space, the device driver - * will get callbacks through sync_cpu_device_pagetables() operation (see - * hmm_mirror_ops struct). - * - * Device driver must not free the struct containing the hmm_mirror struct - * before calling hmm_mirror_unregister(). The expected usage is to do that when - * the device driver is unbinding from an address space. - * - * - * void device_unbind_address_space(struct device_address_space *das) - * { - * // Device driver specific cleanup - * ... - * - * hmm_mirror_unregister(&a...

...= { +static const struct hmm_mirror_ops nouveau_svmm = { .sync_cpu_device_pagetables = nouveau_svmm_sync_cpu_device_pagetables, - .release = nouveau_svmm_release, }; void @@ -294,7 +310,10 @@ nouveau_svmm_fini(struct nouveau_svmm **psvmm) struct nouveau_svmm *svmm = *psvmm; if (svmm) { hmm_mirror_unregister(&svmm->mirror); - kfree(*psvmm); + mutex_lock(&svmm->mutex); + svmm->vmm = NULL; + mutex_unlock(&svmm->mutex); + mmu_notifier_put(&svmm->notifier); *psvmm = NULL; } } @@ -320,7 +339,7 @@ nouveau_svmm_init(struct drm_device *dev, void *data, mutex_lock(&am...

...struct mmu_notifier_range *update) -{ - return 0; -} - -static const struct hmm_mirror_ops nouveau_svmm = { - .sync_cpu_device_pagetables = nouveau_svmm_sync_cpu_device_pagetables, -}; - void nouveau_svmm_fini(struct nouveau_svmm **psvmm) { struct nouveau_svmm *svmm = *psvmm; if (svmm) { - hmm_mirror_unregister(&svmm->mirror); mutex_lock(&svmm->mutex); svmm->vmm = NULL; mutex_unlock(&svmm->mutex); @@ -357,15 +343,10 @@ nouveau_svmm_init(struct drm_device *dev, void *data, goto out_free; down_write(&current->mm->mmap_sem); - svmm->mirror.ops = &nouve...

...;hch at lst.de> > mm/hmm.c | 62 ++++++++++++++++++++++++-------------------------------- > 1 file changed, 27 insertions(+), 35 deletions(-) > > diff --git a/mm/hmm.c b/mm/hmm.c > index 9a908902e4cc..d66fa29b42e0 100644 > +++ b/mm/hmm.c > @@ -278,7 +278,6 @@ EXPORT_SYMBOL(hmm_mirror_unregister); > > struct hmm_vma_walk { > struct hmm_range *range; > - struct dev_pagemap *pgmap; > unsigned long last; > unsigned int flags; > }; > @@ -475,6 +474,7 @@ static int hmm_vma_handle_pmd(struct mm_walk *walk, > #ifdef CONFIG_TRANSPARENT_HUGEPAGE > struct...

Hi Dan, Jérôme and Jason, below is a series that cleans up the dev_pagemap interface so that it is more easily usable, which removes the need to wrap it in hmm and thus allowing to kill a lot of code Note: this series is on top of Linux 5.2-rc6 and has some minor conflicts with the hmm tree that are easy to resolve. Diffstat summary: 34 files changed, 379 insertions(+), 1016 deletions(-) Git

...e_shift = PAGE_SHIFT; range.start = args.i.p.addr; range.end = args.i.p.addr + args.i.p.size; range.pfns = args.phys; diff --git a/include/linux/hmm.h b/include/linux/hmm.h index 59be0aa2476d..c5b51376b453 100644 --- a/include/linux/hmm.h +++ b/include/linux/hmm.h @@ -400,11 +400,7 @@ void hmm_mirror_unregister(struct hmm_mirror *mirror); /* * Please see Documentation/vm/hmm.rst for how to use the range API. */ -int hmm_range_register(struct hmm_range *range, - struct hmm_mirror *mirror, - unsigned long start, - unsigned long end, - unsigned page_shift); +int hmm_range...

...toph Hellwig <hch at lst.de> --- mm/hmm.c | 62 ++++++++++++++++++++++++-------------------------------- 1 file changed, 27 insertions(+), 35 deletions(-) diff --git a/mm/hmm.c b/mm/hmm.c index 9a908902e4cc..d66fa29b42e0 100644 --- a/mm/hmm.c +++ b/mm/hmm.c @@ -278,7 +278,6 @@ EXPORT_SYMBOL(hmm_mirror_unregister); struct hmm_vma_walk { struct hmm_range *range; - struct dev_pagemap *pgmap; unsigned long last; unsigned int flags; }; @@ -475,6 +474,7 @@ static int hmm_vma_handle_pmd(struct mm_walk *walk, #ifdef CONFIG_TRANSPARENT_HUGEPAGE struct hmm_vma_walk *hmm_vma_walk = walk->private;...

From: Jason Gunthorpe <jgg at mellanox.com> 8 of the mmu_notifier using drivers (i915_gem, radeon_mn, umem_odp, hfi1, scif_dma, vhost, gntdev, hmm) drivers are using a common pattern where they only use invalidate_range_start/end and immediately check the invalidating range against some driver data structure to tell if the driver is interested. Half of them use an interval_tree, the others

...mm.c | 62 ++++++++++++++++++++++++-------------------------------- > > 1 file changed, 27 insertions(+), 35 deletions(-) > > > > diff --git a/mm/hmm.c b/mm/hmm.c > > index 9a908902e4cc..d66fa29b42e0 100644 > > +++ b/mm/hmm.c > > @@ -278,7 +278,6 @@ EXPORT_SYMBOL(hmm_mirror_unregister); > > > > struct hmm_vma_walk { > > struct hmm_range *range; > > - struct dev_pagemap *pgmap; > > unsigned long last; > > unsigned int flags; > > }; > > @@ -475,6 +474,7 @@ static int hmm_vma_ha...

From: Jason Gunthorpe <jgg at mellanox.com> 8 of the mmu_notifier using drivers (i915_gem, radeon_mn, umem_odp, hfi1, scif_dma, vhost, gntdev, hmm) drivers are using a common pattern where they only use invalidate_range_start/end and immediately check the invalidating range against some driver data structure to tell if the driver is interested. Half of them use an interval_tree, the others

...rb_root, it.rb) { > - list_for_each_entry_safe(bo, next_bo, &node->bos, mn_list) { > - bo->mn = NULL; > - list_del_init(&bo->mn_list); > - } > - kfree(node); > - } > - up_write(&amn->lock); > - mutex_unlock(&adev->mn_lock); > - > - hmm_mirror_unregister(&amn->mirror); > - kfree(amn); > -} > - > -/** > - * amdgpu_hmm_mirror_release - callback to notify about mm destruction > - * > - * @mirror: the HMM mirror (mm) this callback is about > - * > - * Shedule a work item to lazy destroy HMM mirror. > - */ > -stat...

Hi Jérôme, Ben, Felix and Jason, below is a series against the hmm tree which cleans up various minor bits and allows HMM_MIRROR to be built on all architectures. Diffstat: 11 files changed, 94 insertions(+), 210 deletions(-) A git tree is also available at: git://git.infradead.org/users/hch/misc.git hmm-cleanups.2 Gitweb:

Hi Jérôme, Ben, Felxi and Jason, below is a series against the hmm tree which cleans up various minor bits and allows HMM_MIRROR to be built on all architectures. Diffstat: 7 files changed, 81 insertions(+), 171 deletions(-) A git tree is also available at: git://git.infradead.org/users/hch/misc.git hmm-cleanups Gitweb:

From: Jérôme Glisse <jglisse at redhat.com> (mm is cced just to allow exposure of device driver work without ccing a long list of peoples. I do not think there is anything usefull to discuss from mm point of view but i might be wrong, so just for the curious :)). git://people.freedesktop.org/~glisse/linux branch: nouveau-hmm-v00

...rb_root, it.rb) { > - list_for_each_entry_safe(bo, next_bo, &node->bos, mn_list) { > - bo->mn = NULL; > - list_del_init(&bo->mn_list); > - } > - kfree(node); > - } > - up_write(&amn->lock); > - mutex_unlock(&adev->mn_lock); > - > - hmm_mirror_unregister(&amn->mirror); > - kfree(amn); > -} > - > -/** > - * amdgpu_hmm_mirror_release - callback to notify about mm destruction > - * > - * @mirror: the HMM mirror (mm) this callback is about > - * > - * Shedule a work item to lazy destroy HMM mirror. > - */ > -stat...

...(node, next_node, - &amn->objects.rb_root, it.rb) { - list_for_each_entry_safe(bo, next_bo, &node->bos, mn_list) { - bo->mn = NULL; - list_del_init(&bo->mn_list); - } - kfree(node); - } - up_write(&amn->lock); - mutex_unlock(&adev->mn_lock); - - hmm_mirror_unregister(&amn->mirror); - kfree(amn); -} - -/** - * amdgpu_hmm_mirror_release - callback to notify about mm destruction - * - * @mirror: the HMM mirror (mm) this callback is about - * - * Shedule a work item to lazy destroy HMM mirror. - */ -static void amdgpu_hmm_mirror_release(struct hmm_mirror *mi...

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