From: Jason Gunthorpe <jgg@xxxxxxxxxxxx>
Remove the interval tree in the driver and rely on the tree maintained by
the mmu_notifier for delivering mmu_notifier invalidation callbacks.
For some reason amdgpu has a very complicated arrangement where it tries
to prevent duplicate entries in the interval_tree, this is not necessary,
each amdgpu_bo can be its own stand alone entry. interval_tree already
allows duplicates and overlaps in the tree.
Also, there is no need to remove entries upon a release callback, the
mmu_interval API safely allows objects to remain registered beyond the
lifetime of the mm. The driver only has to stop touching the pages during
release.
Reviewed-by: Philip Yang <Philip.Yang@xxxxxxx>
Tested-by: Philip Yang <Philip.Yang@xxxxxxx>
Signed-off-by: Jason Gunthorpe <jgg@xxxxxxxxxxxx>
---
drivers/gpu/drm/amd/amdgpu/amdgpu.h | 2 +
.../gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c | 5 +-
drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 1 +
drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c | 333 ++++--------------
drivers/gpu/drm/amd/amdgpu/amdgpu_mn.h | 4 -
drivers/gpu/drm/amd/amdgpu/amdgpu_object.h | 13 +-
6 files changed, 77 insertions(+), 281 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
index bd37df5dd6d048..60591a5d420021 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -1006,6 +1006,8 @@ struct amdgpu_device {
struct mutex lock_reset;
struct amdgpu_doorbell_index doorbell_index;
+ struct mutex notifier_lock;
+
int asic_reset_res;
struct work_struct xgmi_reset_work;
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
index 6d021ecc8d598f..47700302a08b7f 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
@@ -481,8 +481,7 @@ static void remove_kgd_mem_from_kfd_bo_list(struct kgd_mem *mem,
*
* Returns 0 for success, negative errno for errors.
*/
-static int init_user_pages(struct kgd_mem *mem, struct mm_struct *mm,
- uint64_t user_addr)
+static int init_user_pages(struct kgd_mem *mem, uint64_t user_addr)
{
struct amdkfd_process_info *process_info = mem->process_info;
struct amdgpu_bo *bo = mem->bo;
@@ -1195,7 +1194,7 @@ int amdgpu_amdkfd_gpuvm_alloc_memory_of_gpu(
add_kgd_mem_to_kfd_bo_list(*mem, avm->process_info, user_addr);
if (user_addr) {
- ret = init_user_pages(*mem, current->mm, user_addr);
+ ret = init_user_pages(*mem, user_addr);
if (ret)
goto allocate_init_user_pages_failed;
}
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index 5a1939dbd4e3e6..38f97998aaddb2 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -2633,6 +2633,7 @@ int amdgpu_device_init(struct amdgpu_device *adev,
mutex_init(&adev->virt.vf_errors.lock);
hash_init(adev->mn_hash);
mutex_init(&adev->lock_reset);
+ mutex_init(&adev->notifier_lock);
mutex_init(&adev->virt.dpm_mutex);
mutex_init(&adev->psp.mutex);
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c
index 31d4deb5d29484..9fe1c31ce17a30 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c
@@ -50,66 +50,6 @@
#include "amdgpu.h"
#include "amdgpu_amdkfd.h"
-/**
- * struct amdgpu_mn_node
- *
- * @it: interval node defining start-last of the affected address range
- * @bos: list of all BOs in the affected address range
- *
- * Manages all BOs which are affected of a certain range of address space.
- */
-struct amdgpu_mn_node {
- struct interval_tree_node it;
- struct list_head bos;
-};
-
-/**
- * amdgpu_mn_destroy - destroy the HMM mirror
- *
- * @work: previously sheduled work item
- *
- * Lazy destroys the notifier from a work item
- */
-static void amdgpu_mn_destroy(struct work_struct *work)
-{
- struct amdgpu_mn *amn = container_of(work, struct amdgpu_mn, work);
- struct amdgpu_device *adev = amn->adev;
- struct amdgpu_mn_node *node, *next_node;
- struct amdgpu_bo *bo, *next_bo;
-
- mutex_lock(&adev->mn_lock);
- down_write(&amn->lock);
- hash_del(&amn->node);
- rbtree_postorder_for_each_entry_safe(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 *mirror)
-{
- struct amdgpu_mn *amn = container_of(mirror, struct amdgpu_mn, mirror);
-
- INIT_WORK(&amn->work, amdgpu_mn_destroy);
- schedule_work(&amn->work);
-}
-
/**
* amdgpu_mn_lock - take the write side lock for this notifier
*
@@ -133,157 +73,80 @@ void amdgpu_mn_unlock(struct amdgpu_mn *mn)
}
/**
- * amdgpu_mn_read_lock - take the read side lock for this notifier
- *
- * @amn: our notifier
- */
-static int amdgpu_mn_read_lock(struct amdgpu_mn *amn, bool blockable)
-{
- if (blockable)
- down_read(&amn->lock);
- else if (!down_read_trylock(&amn->lock))
- return -EAGAIN;
-
- return 0;
-}
-
-/**
- * amdgpu_mn_read_unlock - drop the read side lock for this notifier
- *
- * @amn: our notifier
- */
-static void amdgpu_mn_read_unlock(struct amdgpu_mn *amn)
-{
- up_read(&amn->lock);
-}
-
-/**
- * amdgpu_mn_invalidate_node - unmap all BOs of a node
+ * amdgpu_mn_invalidate_gfx - callback to notify about mm change
*
- * @node: the node with the BOs to unmap
- * @start: start of address range affected
- * @end: end of address range affected
+ * @mni: the range (mm) is about to update
+ * @range: details on the invalidation
+ * @cur_seq: Value to pass to mmu_interval_set_seq()
*
* Block for operations on BOs to finish and mark pages as accessed and
* potentially dirty.
*/
-static void amdgpu_mn_invalidate_node(struct amdgpu_mn_node *node,
- unsigned long start,
- unsigned long end)
+static bool amdgpu_mn_invalidate_gfx(struct mmu_interval_notifier *mni,
+ const struct mmu_notifier_range *range,
+ unsigned long cur_seq)
{
- struct amdgpu_bo *bo;
+ struct amdgpu_bo *bo = container_of(mni, struct amdgpu_bo, notifier);
+ struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev);
long r;
- list_for_each_entry(bo, &node->bos, mn_list) {
-
- if (!amdgpu_ttm_tt_affect_userptr(bo->tbo.ttm, start, end))
- continue;
+ if (!mmu_notifier_range_blockable(range))
+ return false;
- r = dma_resv_wait_timeout_rcu(bo->tbo.base.resv,
- true, false, MAX_SCHEDULE_TIMEOUT);
- if (r <= 0)
- DRM_ERROR("(%ld) failed to wait for user bo\n", r);
- }
+ mutex_lock(&adev->notifier_lock);
+ r = dma_resv_wait_timeout_rcu(bo->tbo.base.resv, true, false,
+ MAX_SCHEDULE_TIMEOUT);
+ mutex_unlock(&adev->notifier_lock);
+ if (r <= 0)
+ DRM_ERROR("(%ld) failed to wait for user bo\n", r);
+ return true;
}
+static const struct mmu_interval_notifier_ops amdgpu_mn_gfx_ops = {
+ .invalidate = amdgpu_mn_invalidate_gfx,
+};
+
/**
- * amdgpu_mn_sync_pagetables_gfx - callback to notify about mm change
+ * amdgpu_mn_invalidate_hsa - callback to notify about mm change
*
- * @mirror: the hmm_mirror (mm) is about to update
- * @update: the update start, end address
+ * @mni: the range (mm) is about to update
+ * @range: details on the invalidation
+ * @cur_seq: Value to pass to mmu_interval_set_seq()
*
- * Block for operations on BOs to finish and mark pages as accessed and
- * potentially dirty.
+ * We temporarily evict the BO attached to this range. This necessitates
+ * evicting all user-mode queues of the process.
*/
-static int
-amdgpu_mn_sync_pagetables_gfx(struct hmm_mirror *mirror,
- const struct mmu_notifier_range *update)
+static bool amdgpu_mn_invalidate_hsa(struct mmu_interval_notifier *mni,
+ const struct mmu_notifier_range *range,
+ unsigned long cur_seq)
{
- struct amdgpu_mn *amn = container_of(mirror, struct amdgpu_mn, mirror);
- unsigned long start = update->start;
- unsigned long end = update->end;
- 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
- */
- if (amdgpu_mn_read_lock(amn, blockable))
- return -EAGAIN;
-
- it = interval_tree_iter_first(&amn->objects, start, end);
- while (it) {
- struct amdgpu_mn_node *node;
-
- if (!blockable) {
- amdgpu_mn_read_unlock(amn);
- return -EAGAIN;
- }
-
- node = container_of(it, struct amdgpu_mn_node, it);
- it = interval_tree_iter_next(it, start, end);
+ struct amdgpu_bo *bo = container_of(mni, struct amdgpu_bo, notifier);
+ struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev);
- amdgpu_mn_invalidate_node(node, start, end);
- }
+ if (!mmu_notifier_range_blockable(range))
+ return false;
- amdgpu_mn_read_unlock(amn);
+ mutex_lock(&adev->notifier_lock);
+ amdgpu_amdkfd_evict_userptr(bo->kfd_bo, bo->notifier.mm);
+ mutex_unlock(&adev->notifier_lock);
- return 0;
+ return true;
}
-/**
- * amdgpu_mn_sync_pagetables_hsa - callback to notify about mm change
- *
- * @mirror: the hmm_mirror (mm) is about to update
- * @update: the update start, end address
- *
- * We temporarily evict all BOs between start and end. This
- * necessitates evicting all user-mode queues of the process. The BOs
- * are restorted in amdgpu_mn_invalidate_range_end_hsa.
- */
-static int
-amdgpu_mn_sync_pagetables_hsa(struct hmm_mirror *mirror,
- const struct mmu_notifier_range *update)
+static const struct mmu_interval_notifier_ops amdgpu_mn_hsa_ops = {
+ .invalidate = amdgpu_mn_invalidate_hsa,
+};
+
+static int amdgpu_mn_sync_pagetables(struct hmm_mirror *mirror,
+ const struct mmu_notifier_range *update)
{
struct amdgpu_mn *amn = container_of(mirror, struct amdgpu_mn, mirror);
- unsigned long start = update->start;
- unsigned long end = update->end;
- 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))
+ if (!mmu_notifier_range_blockable(update))
return -EAGAIN;
- it = interval_tree_iter_first(&amn->objects, start, end);
- while (it) {
- struct amdgpu_mn_node *node;
- struct amdgpu_bo *bo;
-
- if (!blockable) {
- amdgpu_mn_read_unlock(amn);
- return -EAGAIN;
- }
-
- node = container_of(it, struct amdgpu_mn_node, it);
- it = interval_tree_iter_next(it, start, end);
-
- list_for_each_entry(bo, &node->bos, mn_list) {
- struct kgd_mem *mem = bo->kfd_bo;
-
- if (amdgpu_ttm_tt_affect_userptr(bo->tbo.ttm,
- start, end))
- amdgpu_amdkfd_evict_userptr(mem, amn->mm);
- }
- }
-
- amdgpu_mn_read_unlock(amn);
-
+ down_read(&amn->lock);
+ up_read(&amn->lock);
return 0;
}
@@ -295,12 +158,10 @@ amdgpu_mn_sync_pagetables_hsa(struct hmm_mirror *mirror,
static struct hmm_mirror_ops amdgpu_hmm_mirror_ops[] = {
[AMDGPU_MN_TYPE_GFX] = {
- .sync_cpu_device_pagetables = amdgpu_mn_sync_pagetables_gfx,
- .release = amdgpu_hmm_mirror_release
+ .sync_cpu_device_pagetables = amdgpu_mn_sync_pagetables,
},
[AMDGPU_MN_TYPE_HSA] = {
- .sync_cpu_device_pagetables = amdgpu_mn_sync_pagetables_hsa,
- .release = amdgpu_hmm_mirror_release
+ .sync_cpu_device_pagetables = amdgpu_mn_sync_pagetables,
},
};
@@ -327,7 +188,8 @@ struct amdgpu_mn *amdgpu_mn_get(struct amdgpu_device *adev,
}
hash_for_each_possible(adev->mn_hash, amn, node, key)
- if (AMDGPU_MN_KEY(amn->mm, amn->type) == key)
+ if (AMDGPU_MN_KEY(amn->mirror.hmm->mmu_notifier.mm,
+ amn->type) == key)
goto release_locks;
amn = kzalloc(sizeof(*amn), GFP_KERNEL);
@@ -337,10 +199,8 @@ struct amdgpu_mn *amdgpu_mn_get(struct amdgpu_device *adev,
}
amn->adev = adev;
- amn->mm = mm;
init_rwsem(&amn->lock);
amn->type = type;
- amn->objects = RB_ROOT_CACHED;
amn->mirror.ops = &amdgpu_hmm_mirror_ops[type];
r = hmm_mirror_register(&amn->mirror, mm);
@@ -369,100 +229,33 @@ struct amdgpu_mn *amdgpu_mn_get(struct amdgpu_device *adev,
* @bo: amdgpu buffer object
* @addr: userptr addr we should monitor
*
- * Registers an HMM mirror for the given BO at the specified address.
+ * Registers a mmu_notifier for the given BO at the specified address.
* Returns 0 on success, -ERRNO if anything goes wrong.
*/
int amdgpu_mn_register(struct amdgpu_bo *bo, unsigned long addr)
{
- unsigned long end = addr + amdgpu_bo_size(bo) - 1;
- 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;
- struct amdgpu_mn *amn;
- struct amdgpu_mn_node *node = NULL, *new_node;
- struct list_head bos;
- struct interval_tree_node *it;
-
- amn = amdgpu_mn_get(adev, type);
- if (IS_ERR(amn))
- return PTR_ERR(amn);
-
- new_node = kmalloc(sizeof(*new_node), GFP_KERNEL);
- if (!new_node)
- return -ENOMEM;
-
- INIT_LIST_HEAD(&bos);
-
- down_write(&amn->lock);
-
- while ((it = interval_tree_iter_first(&amn->objects, addr, end))) {
- kfree(node);
- 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);
- list_splice(&node->bos, &bos);
- }
-
- if (!node)
- node = new_node;
+ if (bo->kfd_bo)
+ bo->notifier.ops = &amdgpu_mn_hsa_ops;
else
- kfree(new_node);
-
- bo->mn = amn;
-
- node->it.start = addr;
- node->it.last = end;
- INIT_LIST_HEAD(&node->bos);
- list_splice(&bos, &node->bos);
- list_add(&bo->mn_list, &node->bos);
+ bo->notifier.ops = &amdgpu_mn_gfx_ops;
- interval_tree_insert(&node->it, &amn->objects);
-
- up_write(&amn->lock);
-
- return 0;
+ return mmu_interval_notifier_insert(&bo->notifier, addr,
+ amdgpu_bo_size(bo), current->mm);
}
/**
- * amdgpu_mn_unregister - unregister a BO for HMM mirror updates
+ * amdgpu_mn_unregister - unregister a BO for notifier updates
*
* @bo: amdgpu buffer object
*
- * Remove any registration of HMM mirror updates from the buffer object.
+ * Remove any registration of mmu notifier updates from the buffer object.
*/
void amdgpu_mn_unregister(struct amdgpu_bo *bo)
{
- struct amdgpu_device *adev = amdgpu_ttm_adev(bo->tbo.bdev);
- struct amdgpu_mn *amn;
- struct list_head *head;
-
- mutex_lock(&adev->mn_lock);
-
- amn = bo->mn;
- if (amn == NULL) {
- mutex_unlock(&adev->mn_lock);
+ if (!bo->notifier.mm)
return;
- }
-
- down_write(&amn->lock);
-
- /* save the next list entry for later */
- head = bo->mn_list.next;
-
- bo->mn = NULL;
- list_del_init(&bo->mn_list);
-
- if (list_empty(head)) {
- struct amdgpu_mn_node *node;
-
- node = container_of(head, struct amdgpu_mn_node, bos);
- interval_tree_remove(&node->it, &amn->objects);
- kfree(node);
- }
-
- up_write(&amn->lock);
- mutex_unlock(&adev->mn_lock);
+ mmu_interval_notifier_remove(&bo->notifier);
+ bo->notifier.mm = NULL;
}
/* flags used by HMM internal, not related to CPU/GPU PTE flags */
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.h
index b8ed68943625c2..d73ab2947b22b2 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.h
@@ -39,12 +39,10 @@ enum amdgpu_mn_type {
* struct amdgpu_mn
*
* @adev: amdgpu device pointer
- * @mm: process address space
* @type: type of MMU notifier
* @work: destruction work item
* @node: hash table node to find structure by adev and mn
* @lock: rw semaphore protecting the notifier nodes
- * @objects: interval tree containing amdgpu_mn_nodes
* @mirror: HMM mirror function support
*
* Data for each amdgpu device and process address space.
@@ -52,7 +50,6 @@ enum amdgpu_mn_type {
struct amdgpu_mn {
/* constant after initialisation */
struct amdgpu_device *adev;
- struct mm_struct *mm;
enum amdgpu_mn_type type;
/* only used on destruction */
@@ -63,7 +60,6 @@ struct amdgpu_mn {
/* objects protected by lock */
struct rw_semaphore lock;
- struct rb_root_cached objects;
#ifdef CONFIG_HMM_MIRROR
/* HMM mirror */
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.h
index 658f4c9779b704..2792c5c70fd10d 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.h
@@ -30,6 +30,9 @@
#include <drm/amdgpu_drm.h>
#include "amdgpu.h"
+#ifdef CONFIG_MMU_NOTIFIER
+#include <linux/mmu_notifier.h>
+#endif
#define AMDGPU_BO_INVALID_OFFSET LONG_MAX
#define AMDGPU_BO_MAX_PLACEMENTS 3
@@ -100,10 +103,12 @@ struct amdgpu_bo {
struct ttm_bo_kmap_obj dma_buf_vmap;
struct amdgpu_mn *mn;
- union {
- struct list_head mn_list;
- struct list_head shadow_list;
- };
+
+#ifdef CONFIG_MMU_NOTIFIER
+ struct mmu_interval_notifier notifier;
+#endif
+
+ struct list_head shadow_list;
struct kgd_mem *kfd_bo;
};
--
2.24.0
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