On 2018-09-13 04:52 PM, Philip Yang wrote:
> Replace our MMU notifier with hmm_mirror_ops.sync_cpu_device_pagetables
> callback. Enable CONFIG_HMM and CONFIG_HMM_MIRROR as a dependency in
> DRM_AMDGPU_USERPTR Kconfig.
>
> It supports both KFD userptr and gfx userptr paths.
>
> This depends on several HMM patchset from Jérôme Glisse queued for
> upstream.
>
> Change-Id: Ie62c3c5e3c5b8521ab3b438d1eff2aa2a003835e
> Signed-off-by: Philip Yang <Philip.Yang at amd.com>
> ---
> drivers/gpu/drm/amd/amdgpu/Kconfig | 6 +-
> drivers/gpu/drm/amd/amdgpu/Makefile | 2 +-
> drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c | 121 ++++++++++++++-------------------
> drivers/gpu/drm/amd/amdgpu/amdgpu_mn.h | 2 +-
> 4 files changed, 56 insertions(+), 75 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/Kconfig b/drivers/gpu/drm/amd/amdgpu/Kconfig
> index 9221e54..960a633 100644
> --- a/drivers/gpu/drm/amd/amdgpu/Kconfig
> +++ b/drivers/gpu/drm/amd/amdgpu/Kconfig
> @@ -26,10 +26,10 @@ config DRM_AMDGPU_CIK
> config DRM_AMDGPU_USERPTR
> bool "Always enable userptr write support"
> depends on DRM_AMDGPU
> - select MMU_NOTIFIER
> + select HMM_MIRROR
> help
> - This option selects CONFIG_MMU_NOTIFIER if it isn't already
> - selected to enabled full userptr support.
> + This option selects CONFIG_HMM and CONFIG_HMM_MIRROR if it
> + isn't already selected to enabled full userptr support.
>
> config DRM_AMDGPU_GART_DEBUGFS
> bool "Allow GART access through debugfs"
> diff --git a/drivers/gpu/drm/amd/amdgpu/Makefile b/drivers/gpu/drm/amd/amdgpu/Makefile
> index 138cb78..c1e5d43 100644
> --- a/drivers/gpu/drm/amd/amdgpu/Makefile
> +++ b/drivers/gpu/drm/amd/amdgpu/Makefile
> @@ -171,7 +171,7 @@ endif
> amdgpu-$(CONFIG_COMPAT) += amdgpu_ioc32.o
> amdgpu-$(CONFIG_VGA_SWITCHEROO) += amdgpu_atpx_handler.o
> amdgpu-$(CONFIG_ACPI) += amdgpu_acpi.o
> -amdgpu-$(CONFIG_MMU_NOTIFIER) += amdgpu_mn.o
> +amdgpu-$(CONFIG_HMM) += amdgpu_mn.o
>
> include $(FULL_AMD_PATH)/powerplay/Makefile
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c
> index e55508b..ad52f34 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c
> @@ -45,7 +45,7 @@
>
> #include <linux/firmware.h>
> #include <linux/module.h>
> -#include <linux/mmu_notifier.h>
> +#include <linux/hmm.h>
> #include <linux/interval_tree.h>
> #include <drm/drmP.h>
> #include <drm/drm.h>
> @@ -66,6 +66,7 @@
Need to remove @mn documentation.
> * @objects: interval tree containing amdgpu_mn_nodes
> * @read_lock: mutex for recursive locking of @lock
> * @recursion: depth of recursion
> + * @mirror: HMM mirror function support
> *
> * Data for each amdgpu device and process address space.
> */
> @@ -73,7 +74,6 @@ struct amdgpu_mn {
> /* constant after initialisation */
> struct amdgpu_device *adev;
> struct mm_struct *mm;
> - struct mmu_notifier mn;
> enum amdgpu_mn_type type;
>
> /* only used on destruction */
> @@ -87,6 +87,9 @@ struct amdgpu_mn {
> struct rb_root_cached objects;
> struct mutex read_lock;
> atomic_t recursion;
> +
> + /* HMM mirror */
> + struct hmm_mirror mirror;
> };
>
> /**
> @@ -103,7 +106,7 @@ struct amdgpu_mn_node {
> };
>
> /**
> - * amdgpu_mn_destroy - destroy the MMU notifier
> + * amdgpu_mn_destroy - destroy the HMM mirror
> *
> * @work: previously sheduled work item
> *
> @@ -129,28 +132,26 @@ static void amdgpu_mn_destroy(struct work_struct *work)
> }
> up_write(&amn->lock);
> mutex_unlock(&adev->mn_lock);
> - mmu_notifier_unregister_no_release(&amn->mn, amn->mm);
> + hmm_mirror_unregister(&amn->mirror);
> +
> kfree(amn);
> }
>
> /**
> * amdgpu_mn_release - callback to notify about mm destruction
Update the function name in the comment.
> *
> - * @mn: our notifier
> - * @mm: the mm this callback is about
> + * @mirror: the HMM mirror (mm) this callback is about
> *
> - * Shedule a work item to lazy destroy our notifier.
> + * Shedule a work item to lazy destroy HMM mirror.
> */
> -static void amdgpu_mn_release(struct mmu_notifier *mn,
> - struct mm_struct *mm)
> +static void amdgpu_hmm_mirror_release(struct hmm_mirror *mirror)
> {
> - struct amdgpu_mn *amn = container_of(mn, struct amdgpu_mn, mn);
> + 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
> *
> @@ -237,21 +238,19 @@ static void amdgpu_mn_invalidate_node(struct amdgpu_mn_node *node,
> /**
> * amdgpu_mn_invalidate_range_start_gfx - callback to notify about mm change
> *
> - * @mn: our notifier
> - * @mm: the mm this callback is about
> - * @start: start of updated range
> - * @end: end of updated range
> + * @mirror: the hmm_mirror (mm) is about to update
> + * @update: the update start, end address
> *
> * Block for operations on BOs to finish and mark pages as accessed and
> * potentially dirty.
> */
> -static int amdgpu_mn_invalidate_range_start_gfx(struct mmu_notifier *mn,
> - struct mm_struct *mm,
> - unsigned long start,
> - unsigned long end,
> - bool blockable)
> +static int amdgpu_mn_invalidate_range_start_gfx(struct hmm_mirror *mirror,
> + const struct hmm_update *update)
> {
> - struct amdgpu_mn *amn = container_of(mn, struct amdgpu_mn, mn);
> + struct amdgpu_mn *amn = container_of(mirror, struct amdgpu_mn, mirror);
> + unsigned long start = update->start;
> + unsigned long end = update->end;
> + bool blockable = update->blockable;
> struct interval_tree_node *it;
>
> /* notification is exclusive, but interval is inclusive */
> @@ -278,28 +277,28 @@ static int amdgpu_mn_invalidate_range_start_gfx(struct mmu_notifier *mn,
> amdgpu_mn_invalidate_node(node, start, end);
> }
>
> + amdgpu_mn_read_unlock(amn);
> +
amdgpu_mn_read_lock/unlock support recursive locking for multiple
overlapping or nested invalidation ranges. But if you'r locking and
unlocking in the same function. Is that still a concern?
> return 0;
> }
>
> /**
> * amdgpu_mn_invalidate_range_start_hsa - callback to notify about mm change
> *
> - * @mn: our notifier
> - * @mm: the mm this callback is about
> - * @start: start of updated range
> - * @end: end of updated range
> + * @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_invalidate_range_start_hsa(struct mmu_notifier *mn,
> - struct mm_struct *mm,
> - unsigned long start,
> - unsigned long end,
> - bool blockable)
> +static int amdgpu_mn_invalidate_range_start_hsa(struct hmm_mirror *mirror,
> + const struct hmm_update *update)
> {
> - struct amdgpu_mn *amn = container_of(mn, struct amdgpu_mn, mn);
> + struct amdgpu_mn *amn = container_of(mirror, struct amdgpu_mn, mirror);
> + unsigned long start = update->start;
> + unsigned long end = update->end;
> + bool blockable = update->blockable;
> struct interval_tree_node *it;
>
> /* notification is exclusive, but interval is inclusive */
> @@ -326,59 +325,41 @@ static int amdgpu_mn_invalidate_range_start_hsa(struct mmu_notifier *mn,
>
> if (amdgpu_ttm_tt_affect_userptr(bo->tbo.ttm,
> start, end))
> - amdgpu_amdkfd_evict_userptr(mem, mm);
> + amdgpu_amdkfd_evict_userptr(mem, amn->mm);
> }
> }
>
> + amdgpu_mn_read_unlock(amn);
> +
> return 0;
> }
>
> -/**
> - * amdgpu_mn_invalidate_range_end - callback to notify about mm change
> - *
> - * @mn: our notifier
> - * @mm: the mm this callback is about
> - * @start: start of updated range
> - * @end: end of updated range
> - *
> - * Release the lock again to allow new command submissions.
> +/* Low bits of any reasonable mm pointer will be unused due to struct
> + * alignment. Use these bits to make a unique key from the mm pointer
> + * and notifier type.
> */
> -static void amdgpu_mn_invalidate_range_end(struct mmu_notifier *mn,
> - struct mm_struct *mm,
> - unsigned long start,
> - unsigned long end)
> -{
> - struct amdgpu_mn *amn = container_of(mn, struct amdgpu_mn, mn);
> -
> - amdgpu_mn_read_unlock(amn);
> -}
> +#define AMDGPU_MN_KEY(mm, type) ((unsigned long)(mm) + (type))
>
> -static const struct mmu_notifier_ops amdgpu_mn_ops[] = {
> +static struct hmm_mirror_ops amdgpu_hmm_mirror_ops[] = {
> [AMDGPU_MN_TYPE_GFX] = {
> - .release = amdgpu_mn_release,
> - .invalidate_range_start = amdgpu_mn_invalidate_range_start_gfx,
> - .invalidate_range_end = amdgpu_mn_invalidate_range_end,
> + .sync_cpu_device_pagetables =
> + amdgpu_mn_invalidate_range_start_gfx,
> + .release = amdgpu_hmm_mirror_release
> },
> [AMDGPU_MN_TYPE_HSA] = {
> - .release = amdgpu_mn_release,
> - .invalidate_range_start = amdgpu_mn_invalidate_range_start_hsa,
> - .invalidate_range_end = amdgpu_mn_invalidate_range_end,
> + .sync_cpu_device_pagetables =
> + amdgpu_mn_invalidate_range_start_hsa,
> + .release = amdgpu_hmm_mirror_release
> },
> };
>
> -/* Low bits of any reasonable mm pointer will be unused due to struct
> - * alignment. Use these bits to make a unique key from the mm pointer
> - * and notifier type.
> - */
> -#define AMDGPU_MN_KEY(mm, type) ((unsigned long)(mm) + (type))
> -
> /**
> - * amdgpu_mn_get - create notifier context
> + * amdgpu_mn_get - create HMM mirror context
> *
> * @adev: amdgpu device pointer
> * @type: type of MMU notifier context
> *
> - * Creates a notifier context for current->mm.
> + * Creates a HMM mirror context for current->mm.
> */
> struct amdgpu_mn *amdgpu_mn_get(struct amdgpu_device *adev,
> enum amdgpu_mn_type type)
> @@ -408,12 +389,12 @@ struct amdgpu_mn *amdgpu_mn_get(struct amdgpu_device *adev,
> amn->mm = mm;
> init_rwsem(&amn->lock);
> amn->type = type;
> - amn->mn.ops = &amdgpu_mn_ops[type];
> amn->objects = RB_ROOT_CACHED;
> mutex_init(&amn->read_lock);
> atomic_set(&amn->recursion, 0);
>
> - r = __mmu_notifier_register(&amn->mn, mm);
> + amn->mirror.ops = &amdgpu_hmm_mirror_ops[type];
> + r = hmm_mirror_register(&amn->mirror, mm);
> if (r)
> goto free_amn;
>
> @@ -439,7 +420,7 @@ struct amdgpu_mn *amdgpu_mn_get(struct amdgpu_device *adev,
> * @bo: amdgpu buffer object
> * @addr: userptr addr we should monitor
> *
> - * Registers an MMU notifier for the given BO at the specified address.
> + * Registers an HMM mirror 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)
> @@ -495,11 +476,11 @@ int amdgpu_mn_register(struct amdgpu_bo *bo, unsigned long addr)
> }
>
> /**
> - * amdgpu_mn_unregister - unregister a BO for notifier updates
> + * amdgpu_mn_unregister - unregister a BO for HMM mirror updates
> *
> * @bo: amdgpu buffer object
> *
> - * Remove any registration of MMU notifier updates from the buffer object.
> + * Remove any registration of HMM mirror updates from the buffer object.
> */
> void amdgpu_mn_unregister(struct amdgpu_bo *bo)
> {
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.h
> index eb0f432..0e27526 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.h
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.h
> @@ -34,7 +34,7 @@ enum amdgpu_mn_type {
> AMDGPU_MN_TYPE_HSA,
> };
>
> -#if defined(CONFIG_MMU_NOTIFIER)
> +#if defined(CONFIG_HMM)
> void amdgpu_mn_lock(struct amdgpu_mn *mn);
> void amdgpu_mn_unlock(struct amdgpu_mn *mn);
> struct amdgpu_mn *amdgpu_mn_get(struct amdgpu_device *adev,
