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

Davidlohr Bueso
2019-10-03T20:20:36Z

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.

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);
--
2.16.4