Re: [PATCH 09/11] lib/interval-tree: convert interval_tree to half closed intervals

Koenig, Christian
2019-10-04T06:58:11Z

Am 03.10.19 um 22:18 schrieb Davidlohr Bueso:
> The generic tree tree really wants [a, b) intervals, not fully closed.
> As such convert it to use the new interval_tree_gen.h. Most of the
> conversions are straightforward, with the exception of perhaps
> radeon_vm_bo_set_addr(), but semantics have been tried to be left
> untouched.

NAK, the whole thing won't work.

See we need to handle the full device address space which means we have
values in the range of 0x0-0xffffffff.

If you make this a closed interval then the end would wrap around to 0x0
if long is only 32bit.

Regards,
Christian.

>
> Cc: "Christian König" <christian.koenig@amd.com>
> Cc: Alex Deucher <alexander.deucher@amd.com>
> Cc: David Airlie <airlied@linux.ie>
> Cc: Daniel Vetter <daniel@ffwll.ch>
> Cc: Doug Ledford <dledford@redhat.com>
> Cc: Joerg Roedel <joro@8bytes.org>
> Cc: "Jérôme Glisse" <jglisse@redhat.com>
> Cc: dri-devel@lists.freedesktop.org
> Cc: linux-rdma@vger.kernel.org
> Signed-off-by: Davidlohr Bueso <dbueso@suse.de>
> ---
> drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c | 12 +++---------
> drivers/gpu/drm/i915/gem/i915_gem_userptr.c | 5 +----
> drivers/gpu/drm/radeon/radeon_mn.c | 11 ++++-------
> drivers/gpu/drm/radeon/radeon_trace.h | 2 +-
> drivers/gpu/drm/radeon/radeon_vm.c | 26 +++++++++++++-------------
> drivers/infiniband/core/umem_odp.c | 21 +++++++--------------
> drivers/iommu/virtio-iommu.c | 6 +++---
> include/linux/interval_tree.h | 2 +-
> include/rdma/ib_umem_odp.h | 4 ++--
> lib/interval_tree.c | 6 +++---
> 10 files changed, 38 insertions(+), 57 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c
> index 31d4deb5d294..4bbaa9ffa570 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c
> @@ -205,9 +205,6 @@ amdgpu_mn_sync_pagetables_gfx(struct hmm_mirror *mirror,
> bool blockable = mmu_notifier_range_blockable(update);
> struct interval_tree_node *it;
>
> - /* notification is exclusive, but interval is inclusive */
> - end -= 1;
> -
> /* TODO we should be able to split locking for interval tree and
> * amdgpu_mn_invalidate_node
> */
> @@ -254,9 +251,6 @@ amdgpu_mn_sync_pagetables_hsa(struct hmm_mirror *mirror,
> bool blockable = mmu_notifier_range_blockable(update);
> struct interval_tree_node *it;
>
> - /* notification is exclusive, but interval is inclusive */
> - end -= 1;
> -
> if (amdgpu_mn_read_lock(amn, blockable))
> return -EAGAIN;
>
> @@ -374,7 +368,7 @@ struct amdgpu_mn *amdgpu_mn_get(struct amdgpu_device *adev,
> */
> int amdgpu_mn_register(struct amdgpu_bo *bo, unsigned long addr)
> {
> - unsigned long end = addr + amdgpu_bo_size(bo) - 1;
> + unsigned long end = addr + amdgpu_bo_size(bo);
> struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev);
> enum amdgpu_mn_type type =
> bo->kfd_bo ? AMDGPU_MN_TYPE_HSA : AMDGPU_MN_TYPE_GFX;
> @@ -400,7 +394,7 @@ int amdgpu_mn_register(struct amdgpu_bo *bo, unsigned long addr)
> node = container_of(it, struct amdgpu_mn_node, it);
> interval_tree_remove(&node->it, &amn->objects);
> addr = min(it->start, addr);
> - end = max(it->last, end);
> + end = max(it->end, end);
> list_splice(&node->bos, &bos);
> }
>
> @@ -412,7 +406,7 @@ int amdgpu_mn_register(struct amdgpu_bo *bo, unsigned long addr)
> bo->mn = amn;
>
> node->it.start = addr;
> - node->it.last = end;
> + node->it.end = end;
> INIT_LIST_HEAD(&node->bos);
> list_splice(&bos, &node->bos);
> list_add(&bo->mn_list, &node->bos);
> diff --git a/drivers/gpu/drm/i915/gem/i915_gem_userptr.c b/drivers/gpu/drm/i915/gem/i915_gem_userptr.c
> index 11b231c187c5..818ff6b33102 100644
> --- a/drivers/gpu/drm/i915/gem/i915_gem_userptr.c
> +++ b/drivers/gpu/drm/i915/gem/i915_gem_userptr.c
> @@ -99,9 +99,6 @@ userptr_mn_invalidate_range_start(struct mmu_notifier *_mn,
> if (RB_EMPTY_ROOT(&mn->objects.rb_root))
> return 0;
>
> - /* interval ranges are inclusive, but invalidate range is exclusive */
> - end = range->end - 1;
> -
> spin_lock(&mn->lock);
> it = interval_tree_iter_first(&mn->objects, range->start, end);
> while (it) {
> @@ -275,7 +272,7 @@ i915_gem_userptr_init__mmu_notifier(struct drm_i915_gem_object *obj,
> mo->mn = mn;
> mo->obj = obj;
> mo->it.start = obj->userptr.ptr;
> - mo->it.last = obj->userptr.ptr + obj->base.size - 1;
> + mo->it.end = obj->userptr.ptr + obj->base.size;
> RB_CLEAR_NODE(&mo->it.rb);
>
> obj->userptr.mmu_object = mo;
> diff --git a/drivers/gpu/drm/radeon/radeon_mn.c b/drivers/gpu/drm/radeon/radeon_mn.c
> index dbab9a3a969b..4810421dacc2 100644
> --- a/drivers/gpu/drm/radeon/radeon_mn.c
> +++ b/drivers/gpu/drm/radeon/radeon_mn.c
> @@ -66,12 +66,9 @@ static int radeon_mn_invalidate_range_start(struct mmu_notifier *mn,
> struct radeon_mn *rmn = container_of(mn, struct radeon_mn, mn);
> struct ttm_operation_ctx ctx = { false, false };
> struct interval_tree_node *it;
> - unsigned long end;
> + unsigned long end = range->end;
> int ret = 0;
>
> - /* notification is exclusive, but interval is inclusive */
> - end = range->end - 1;
> -
> /* TODO we should be able to split locking for interval tree and
> * the tear down.
> */
> @@ -174,7 +171,7 @@ static const struct mmu_notifier_ops radeon_mn_ops = {
> */
> int radeon_mn_register(struct radeon_bo *bo, unsigned long addr)
> {
> - unsigned long end = addr + radeon_bo_size(bo) - 1;
> + unsigned long end = addr + radeon_bo_size(bo);
> struct mmu_notifier *mn;
> struct radeon_mn *rmn;
> struct radeon_mn_node *node = NULL;
> @@ -195,7 +192,7 @@ int radeon_mn_register(struct radeon_bo *bo, unsigned long addr)
> node = container_of(it, struct radeon_mn_node, it);
> interval_tree_remove(&node->it, &rmn->objects);
> addr = min(it->start, addr);
> - end = max(it->last, end);
> + end = max(it->end, end);
> list_splice(&node->bos, &bos);
> }
>
> @@ -210,7 +207,7 @@ int radeon_mn_register(struct radeon_bo *bo, unsigned long addr)
> bo->mn = rmn;
>
> node->it.start = addr;
> - node->it.last = end;
> + node->it.end = end;
> INIT_LIST_HEAD(&node->bos);
> list_splice(&bos, &node->bos);
> list_add(&bo->mn_list, &node->bos);
> diff --git a/drivers/gpu/drm/radeon/radeon_trace.h b/drivers/gpu/drm/radeon/radeon_trace.h
> index c93f3ab3c4e3..4324f3fc5d82 100644
> --- a/drivers/gpu/drm/radeon/radeon_trace.h
> +++ b/drivers/gpu/drm/radeon/radeon_trace.h
> @@ -73,7 +73,7 @@ TRACE_EVENT(radeon_vm_bo_update,
>
> TP_fast_assign(
> __entry->soffset = bo_va->it.start;
> - __entry->eoffset = bo_va->it.last + 1;
> + __entry->eoffset = bo_va->it.end;
> __entry->flags = bo_va->flags;
> ),
> TP_printk("soffs=%010llx, eoffs=%010llx, flags=%08x",
> diff --git a/drivers/gpu/drm/radeon/radeon_vm.c b/drivers/gpu/drm/radeon/radeon_vm.c
> index e0ad547786e8..b2a54aff21f4 100644
> --- a/drivers/gpu/drm/radeon/radeon_vm.c
> +++ b/drivers/gpu/drm/radeon/radeon_vm.c
> @@ -329,7 +329,7 @@ struct radeon_bo_va *radeon_vm_bo_add(struct radeon_device *rdev,
> bo_va->vm = vm;
> bo_va->bo = bo;
> bo_va->it.start = 0;
> - bo_va->it.last = 0;
> + bo_va->it.end = 0;
> bo_va->flags = 0;
> bo_va->ref_count = 1;
> INIT_LIST_HEAD(&bo_va->bo_list);
> @@ -456,7 +456,7 @@ int radeon_vm_bo_set_addr(struct radeon_device *rdev,
>
> if (soffset) {
> /* make sure object fit at this offset */
> - eoffset = soffset + size - 1;
> + eoffset = soffset + size;
> if (soffset >= eoffset) {
> r = -EINVAL;
> goto error_unreserve;
> @@ -486,14 +486,14 @@ int radeon_vm_bo_set_addr(struct radeon_device *rdev,
> /* bo and tmp overlap, invalid offset */
> dev_err(rdev->dev, "bo %p va 0x%010Lx conflict with "
> "(bo %p 0x%010lx 0x%010lx)\n", bo_va->bo,
> - soffset, tmp->bo, tmp->it.start, tmp->it.last);
> + soffset, tmp->bo, tmp->it.start, tmp->it.end);
> mutex_unlock(&vm->mutex);
> r = -EINVAL;
> goto error_unreserve;
> }
> }
>
> - if (bo_va->it.start || bo_va->it.last) {
> + if (bo_va->it.start || bo_va->it.end) {
> /* add a clone of the bo_va to clear the old address */
> struct radeon_bo_va *tmp;
> tmp = kzalloc(sizeof(struct radeon_bo_va), GFP_KERNEL);
> @@ -503,14 +503,14 @@ int radeon_vm_bo_set_addr(struct radeon_device *rdev,
> goto error_unreserve;
> }
> tmp->it.start = bo_va->it.start;
> - tmp->it.last = bo_va->it.last;
> + tmp->it.end = bo_va->it.end;
> tmp->vm = vm;
> tmp->bo = radeon_bo_ref(bo_va->bo);
>
> interval_tree_remove(&bo_va->it, &vm->va);
> spin_lock(&vm->status_lock);
> bo_va->it.start = 0;
> - bo_va->it.last = 0;
> + bo_va->it.end = 0;
> list_del_init(&bo_va->vm_status);
> list_add(&tmp->vm_status, &vm->freed);
> spin_unlock(&vm->status_lock);
> @@ -519,7 +519,7 @@ int radeon_vm_bo_set_addr(struct radeon_device *rdev,
> if (soffset || eoffset) {
> spin_lock(&vm->status_lock);
> bo_va->it.start = soffset;
> - bo_va->it.last = eoffset;
> + bo_va->it.end = eoffset;
> list_add(&bo_va->vm_status, &vm->cleared);
> spin_unlock(&vm->status_lock);
> interval_tree_insert(&bo_va->it, &vm->va);
> @@ -964,7 +964,7 @@ int radeon_vm_bo_update(struct radeon_device *rdev,
>
> trace_radeon_vm_bo_update(bo_va);
>
> - nptes = bo_va->it.last - bo_va->it.start + 1;
> + nptes = bo_va->it.end - bo_va->it.start;
>
> /* reserve space for one command every (1 << BLOCK_SIZE) entries
> or 2k dwords (whatever is smaller) */
> @@ -1010,7 +1010,7 @@ int radeon_vm_bo_update(struct radeon_device *rdev,
> }
>
> r = radeon_vm_update_ptes(rdev, vm, &ib, bo_va->it.start,
> - bo_va->it.last + 1, addr,
> + bo_va->it.end, addr,
> radeon_vm_page_flags(bo_va->flags));
> if (r) {
> radeon_ib_free(rdev, &ib);
> @@ -1026,7 +1026,7 @@ int radeon_vm_bo_update(struct radeon_device *rdev,
> return r;
> }
> ib.fence->is_vm_update = true;
> - radeon_vm_fence_pts(vm, bo_va->it.start, bo_va->it.last + 1, ib.fence);
> + radeon_vm_fence_pts(vm, bo_va->it.start, bo_va->it.end, ib.fence);
> radeon_fence_unref(&bo_va->last_pt_update);
> bo_va->last_pt_update = radeon_fence_ref(ib.fence);
> radeon_ib_free(rdev, &ib);
> @@ -1124,12 +1124,12 @@ void radeon_vm_bo_rmv(struct radeon_device *rdev,
> list_del(&bo_va->bo_list);
>
> mutex_lock(&vm->mutex);
> - if (bo_va->it.start || bo_va->it.last)
> + if (bo_va->it.start || bo_va->it.end)
> interval_tree_remove(&bo_va->it, &vm->va);
>
> spin_lock(&vm->status_lock);
> list_del(&bo_va->vm_status);
> - if (bo_va->it.start || bo_va->it.last) {
> + if (bo_va->it.start || bo_va->it.end) {
> bo_va->bo = radeon_bo_ref(bo_va->bo);
> list_add(&bo_va->vm_status, &vm->freed);
> } else {
> @@ -1158,7 +1158,7 @@ void radeon_vm_bo_invalidate(struct radeon_device *rdev,
> list_for_each_entry(bo_va, &bo->va, bo_list) {
> spin_lock(&bo_va->vm->status_lock);
> if (list_empty(&bo_va->vm_status) &&
> - (bo_va->it.start || bo_va->it.last))
> + (bo_va->it.start || bo_va->it.end))
> list_add(&bo_va->vm_status, &bo_va->vm->invalidated);
> spin_unlock(&bo_va->vm->status_lock);
> }
> diff --git a/drivers/infiniband/core/umem_odp.c b/drivers/infiniband/core/umem_odp.c
> index f67a30fda1ed..9b7ac93223d6 100644
> --- a/drivers/infiniband/core/umem_odp.c
> +++ b/drivers/infiniband/core/umem_odp.c
> @@ -219,26 +219,19 @@ static inline int ib_init_umem_odp(struct ib_umem_odp *umem_odp)
> ALIGN_DOWN(umem_odp->umem.address, page_size);
> if (check_add_overflow(umem_odp->umem.address,
> (unsigned long)umem_odp->umem.length,
> - &umem_odp->interval_tree.last))
> + &umem_odp->interval_tree.end))
> return -EOVERFLOW;
> - umem_odp->interval_tree.last =
> - ALIGN(umem_odp->interval_tree.last, page_size);
> - if (unlikely(umem_odp->interval_tree.last < page_size))
> + umem_odp->interval_tree.end =
> + ALIGN(umem_odp->interval_tree.end, page_size);
> + if (unlikely(umem_odp->interval_tree.end < page_size))
> return -EOVERFLOW;
>
> - pages = (umem_odp->interval_tree.last -
> + pages = (umem_odp->interval_tree.end -
> umem_odp->interval_tree.start) >>
> umem_odp->page_shift;
> if (!pages)
> return -EINVAL;
>
> - /*
> - * Note that the representation of the intervals in the
> - * interval tree considers the ending point as contained in
> - * the interval.
> - */
> - umem_odp->interval_tree.last--;
> -
> umem_odp->page_list = kvcalloc(
> pages, sizeof(*umem_odp->page_list), GFP_KERNEL);
> if (!umem_odp->page_list)
> @@ -777,12 +770,12 @@ int rbt_ib_umem_for_each_in_range(struct rb_root_cached *root,
> if (unlikely(start == last))
> return ret_val;
>
> - for (node = interval_tree_iter_first(root, start, last - 1);
> + for (node = interval_tree_iter_first(root, start, last);
> node; node = next) {
> /* TODO move the blockable decision up to the callback */
> if (!blockable)
> return -EAGAIN;
> - next = interval_tree_iter_next(node, start, last - 1);
> + next = interval_tree_iter_next(node, start, last);
> umem = container_of(node, struct ib_umem_odp, interval_tree);
> ret_val = cb(umem, start, last, cookie) || ret_val;
> }
> diff --git a/drivers/iommu/virtio-iommu.c b/drivers/iommu/virtio-iommu.c
> index 3ea9d7682999..771740981f43 100644
> --- a/drivers/iommu/virtio-iommu.c
> +++ b/drivers/iommu/virtio-iommu.c
> @@ -323,7 +323,7 @@ static int viommu_add_mapping(struct viommu_domain *vdomain, unsigned long iova,
>
> mapping->paddr = paddr;
> mapping->iova.start = iova;
> - mapping->iova.last = iova + size - 1;
> + mapping->iova.end = iova + size;
> mapping->flags = flags;
>
> spin_lock_irqsave(&vdomain->mappings_lock, irqflags);
> @@ -348,7 +348,7 @@ static size_t viommu_del_mappings(struct viommu_domain *vdomain,
> {
> size_t unmapped = 0;
> unsigned long flags;
> - unsigned long last = iova + size - 1;
> + unsigned long last = iova + size;
> struct viommu_mapping *mapping = NULL;
> struct interval_tree_node *node, *next;
>
> @@ -367,7 +367,7 @@ static size_t viommu_del_mappings(struct viommu_domain *vdomain,
> * Virtio-iommu doesn't allow UNMAP to split a mapping created
> * with a single MAP request, so remove the full mapping.
> */
> - unmapped += mapping->iova.last - mapping->iova.start + 1;
> + unmapped += mapping->iova.end - mapping->iova.start;
>
> interval_tree_remove(node, &vdomain->mappings);
> kfree(mapping);
> diff --git a/include/linux/interval_tree.h b/include/linux/interval_tree.h
> index 288c26f50732..f3d1ea9e4003 100644
> --- a/include/linux/interval_tree.h
> +++ b/include/linux/interval_tree.h
> @@ -7,7 +7,7 @@
> struct interval_tree_node {
> struct rb_node rb;
> unsigned long start; /* Start of interval */
> - unsigned long last; /* Last location _in_ interval */
> + unsigned long end; /* Last location _outside_ interval */
> unsigned long __subtree_last;
> };
>
> diff --git a/include/rdma/ib_umem_odp.h b/include/rdma/ib_umem_odp.h
> index 253df1a1fa54..d0ae7aa2139b 100644
> --- a/include/rdma/ib_umem_odp.h
> +++ b/include/rdma/ib_umem_odp.h
> @@ -97,7 +97,7 @@ static inline unsigned long ib_umem_start(struct ib_umem_odp *umem_odp)
> /* Returns the address of the page after the last one of an ODP umem. */
> static inline unsigned long ib_umem_end(struct ib_umem_odp *umem_odp)
> {
> - return umem_odp->interval_tree.last + 1;
> + return umem_odp->interval_tree.end;
> }
>
> static inline size_t ib_umem_odp_num_pages(struct ib_umem_odp *umem_odp)
> @@ -165,7 +165,7 @@ rbt_ib_umem_lookup(struct rb_root_cached *root, u64 addr, u64 length)
> {
> struct interval_tree_node *node;
>
> - node = interval_tree_iter_first(root, addr, addr + length - 1);
> + node = interval_tree_iter_first(root, addr, addr + length);
> if (!node)
> return NULL;
> return container_of(node, struct ib_umem_odp, interval_tree);
> diff --git a/lib/interval_tree.c b/lib/interval_tree.c
> index 593ce56ece50..336ec5113a28 100644
> --- a/lib/interval_tree.c
> +++ b/lib/interval_tree.c
> @@ -1,15 +1,15 @@
> // SPDX-License-Identifier: GPL-2.0-only
> #include <linux/interval_tree.h>
> -#include <linux/interval_tree_generic.h>
> +#include <linux/interval_tree_gen.h>
> #include <linux/compiler.h>
> #include <linux/export.h>
>
> #define START(node) ((node)->start)
> -#define LAST(node) ((node)->last)
> +#define END(node) ((node)->end)
>
> INTERVAL_TREE_DEFINE(struct interval_tree_node, rb,
> unsigned long, __subtree_last,
> - START, LAST,, interval_tree)
> + START, END,, interval_tree)
>
> EXPORT_SYMBOL_GPL(interval_tree_insert);
> EXPORT_SYMBOL_GPL(interval_tree_remove);