[PATCH] drm/amdgpu: use HMM mirror callback to replace mmu notifier
Felix Kuehling
felix.kuehling at amd.com
Wed Sep 12 18:58:44 UTC 2018
Should we add HMM as a dependency in the Kconfig? At least for KFD
functionality we depend on userptrs.
Regards,
Felix
On 2018-09-12 03:15 AM, Christian König wrote:
> Am 11.09.2018 um 21:31 schrieb Philip Yang:
>> Replace our MMU notifier with hmm_mirror_ops.sync_cpu_device_pagetables
>> callback if kernel configured
>
>> HMM. Kenel configured without HMM still uses
>> our own MMU notifier.
>
> Please drop that and always use the HMM path.
>
> When a kernel doesn't support HMM we should not support userptr either.
>
> Christian.
>
>>
>> It supports both KFD userptr and gfx userptr paths.
>>
>> This depends on several HMM patchset from Jérôme Glisse queued for
>> upstream. See
>> http://172.27.226.38/root/kernel_amd/commits/hmm-dev-v01 (for AMD
>> intranet)
>>
>> Change-Id: Ie62c3c5e3c5b8521ab3b438d1eff2aa2a003835e
>> Signed-off-by: Philip Yang <Philip.Yang at amd.com>
>> ---
>> drivers/gpu/drm/amd/amdgpu/Makefile | 1 +
>> drivers/gpu/drm/amd/amdgpu/amdgpu_hmm.c | 77
>> +++++++++++++++++++++++++++++++++
>> drivers/gpu/drm/amd/amdgpu/amdgpu_hmm.h | 41 ++++++++++++++++++
>> drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c | 49 ++++++++++++++++++++-
>> drivers/gpu/drm/amd/amdgpu/amdgpu_mn.h | 6 +++
>> 5 files changed, 173 insertions(+), 1 deletion(-)
>> create mode 100644 drivers/gpu/drm/amd/amdgpu/amdgpu_hmm.c
>> create mode 100644 drivers/gpu/drm/amd/amdgpu/amdgpu_hmm.h
>>
>> diff --git a/drivers/gpu/drm/amd/amdgpu/Makefile
>> b/drivers/gpu/drm/amd/amdgpu/Makefile
>> index 138cb78..ee691e8 100644
>> --- a/drivers/gpu/drm/amd/amdgpu/Makefile
>> +++ b/drivers/gpu/drm/amd/amdgpu/Makefile
>> @@ -172,6 +172,7 @@ 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_hmm.o
>> include $(FULL_AMD_PATH)/powerplay/Makefile
>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_hmm.c
>> b/drivers/gpu/drm/amd/amdgpu/amdgpu_hmm.c
>> new file mode 100644
>> index 0000000..a502c11
>> --- /dev/null
>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_hmm.c
>> @@ -0,0 +1,77 @@
>> +/*
>> + * Copyright 2018 Advanced Micro Devices, Inc.
>> + *
>> + * Permission is hereby granted, free of charge, to any person
>> obtaining a
>> + * copy of this software and associated documentation files (the
>> "Software"),
>> + * to deal in the Software without restriction, including without
>> limitation
>> + * the rights to use, copy, modify, merge, publish, distribute,
>> sublicense,
>> + * and/or sell copies of the Software, and to permit persons to whom
>> the
>> + * Software is furnished to do so, subject to the following conditions:
>> + *
>> + * The above copyright notice and this permission notice shall be
>> included in
>> + * all copies or substantial portions of the Software.
>> + *
>> + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
>> EXPRESS OR
>> + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
>> MERCHANTABILITY,
>> + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO
>> EVENT SHALL
>> + * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM,
>> DAMAGES OR
>> + * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
>> OTHERWISE,
>> + * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
>> USE OR
>> + * OTHER DEALINGS IN THE SOFTWARE.
>> + */
>> +
>> +#include <linux/mutex.h>
>> +#include <linux/slab.h>
>> +#include <linux/notifier.h>
>> +#include <linux/compat.h>
>> +#include <linux/mman.h>
>> +#include <linux/hmm.h>
>> +#include <asm/page.h>
>> +#include "amdgpu.h"
>> +#include "amdgpu_mn.h"
>> +
>> +static void amdgpu_hmm_release(struct hmm_mirror *mirror)
>> +{
>> + pr_debug("mirror=%p\n", mirror);
>> +}
>> +
>> +static int amdgpu_hmm_sync_cpu_device_pagetables(struct hmm_mirror
>> *mirror,
>> + const struct hmm_update *update)
>> +{
>> + struct hmm *hmm;
>> + struct mm_struct *mm;
>> + unsigned long start;
>> + unsigned long end;
>> +
>> + start = update->start;
>> + end = update->end;
>> +
>> + pr_debug("mirror %p start %lx end %lx\n", mirror, start, end);
>> +
>> + hmm = mirror->hmm;
>> + mm = *(struct mm_struct **)hmm;
>> +
>> + return amdgpu_mn_invalidate_range(mirror, mm, start, end,
>> + update->blockable);
>> +}
>> +
>> +static struct hmm_mirror_ops amdgpu_hmm_mirror_ops = {
>> + .sync_cpu_device_pagetables =
>> amdgpu_hmm_sync_cpu_device_pagetables,
>> + .release = amdgpu_hmm_release
>> +};
>> +
>> +int amdgpu_hmm_register(struct hmm_mirror *mirror, struct mm_struct
>> *mm)
>> +{
>> + pr_debug("mirror=%p\n", mirror);
>> +
>> + mirror->ops = &amdgpu_hmm_mirror_ops;
>> +
>> + return hmm_mirror_register(mirror, mm);
>> +}
>> +
>> +void amdgpu_hmm_unregister(struct hmm_mirror *mirror)
>> +{
>> + pr_debug("mirror=%p\n", mirror);
>> +
>> + hmm_mirror_unregister(mirror);
>> +}
>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_hmm.h
>> b/drivers/gpu/drm/amd/amdgpu/amdgpu_hmm.h
>> new file mode 100644
>> index 0000000..a21a5f6
>> --- /dev/null
>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_hmm.h
>> @@ -0,0 +1,41 @@
>> +/*
>> + * Copyright 2018 Advanced Micro Devices, Inc.
>> + *
>> + * Permission is hereby granted, free of charge, to any person
>> obtaining a
>> + * copy of this software and associated documentation files (the
>> "Software"),
>> + * to deal in the Software without restriction, including without
>> limitation
>> + * the rights to use, copy, modify, merge, publish, distribute,
>> sublicense,
>> + * and/or sell copies of the Software, and to permit persons to whom
>> the
>> + * Software is furnished to do so, subject to the following conditions:
>> + *
>> + * The above copyright notice and this permission notice shall be
>> included in
>> + * all copies or substantial portions of the Software.
>> + *
>> + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
>> EXPRESS OR
>> + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
>> MERCHANTABILITY,
>> + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO
>> EVENT SHALL
>> + * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM,
>> DAMAGES OR
>> + * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
>> OTHERWISE,
>> + * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
>> USE OR
>> + * OTHER DEALINGS IN THE SOFTWARE.
>> + */
>> +
>> +#ifndef __AMDGPU_HMM_H__
>> +#define __AMDGPU_HMM_H__
>> +
>> +#include <linux/mm.h>
>> +#include <linux/hmm.h>
>> +
>> +#if IS_ENABLED(CONFIG_HMM)
>> +
>> +int amdgpu_hmm_register(struct hmm_mirror *mirror, struct mm_struct
>> *mm);
>> +void amdgpu_hmm_unregister(struct hmm_mirror *mirror);
>> +
>> +#else
>> +
>> +#define amdgpu_hmm_register(x, y) (0)
>> +#define amdgpu_hmm_unregister(x)
>> +
>> +#endif
>> +
>> +#endif
>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c
>> b/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c
>> index e55508b..2b60631 100644
>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c
>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c
>> @@ -47,11 +47,13 @@
>> #include <linux/module.h>
>> #include <linux/mmu_notifier.h>
>> #include <linux/interval_tree.h>
>> +#include <linux/hmm.h>
>> #include <drm/drmP.h>
>> #include <drm/drm.h>
>> #include "amdgpu.h"
>> #include "amdgpu_amdkfd.h"
>> +#include "amdgpu_hmm.h"
>> /**
>> * struct amdgpu_mn
>> @@ -66,6 +68,7 @@
>> * @objects: interval tree containing amdgpu_mn_nodes
>> * @read_lock: mutex for recursive locking of @lock
>> * @recursion: depth of recursion
>> + * @hmm_mirror: HMM mirror function support
>> *
>> * Data for each amdgpu device and process address space.
>> */
>> @@ -87,6 +90,11 @@ struct amdgpu_mn {
>> struct rb_root_cached objects;
>> struct mutex read_lock;
>> atomic_t recursion;
>> +
>> +#if IS_ENABLED(CONFIG_HMM)
>> + /* HMM mirror */
>> + struct hmm_mirror hmm_mirror;
>> +#endif
>> };
>> /**
>> @@ -130,6 +138,9 @@ 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);
>> +
>> + amdgpu_hmm_unregister(&amn->hmm_mirror);
>> +
>> kfree(amn);
>> }
>> @@ -372,6 +383,39 @@ static const struct mmu_notifier_ops
>> amdgpu_mn_ops[] = {
>> */
>> #define AMDGPU_MN_KEY(mm, type) ((unsigned long)(mm) + (type))
>> +#if IS_ENABLED(CONFIG_HMM)
>> +
>> +int amdgpu_mn_invalidate_range(struct hmm_mirror *mirror,
>> + struct mm_struct *mm,
>> + unsigned long start,
>> + unsigned long end,
>> + bool blockable)
>> +
>> +{
>> + unsigned long key;
>> + struct amdgpu_mn *amn;
>> + int r = 0;
>> +
>> + amn = container_of(mirror, struct amdgpu_mn, hmm_mirror);
>> + key = AMDGPU_MN_KEY(mm, amn->type);
>> +
>> + hash_for_each_possible(amn->adev->mn_hash, amn, node, key)
>> + if (AMDGPU_MN_KEY(amn->mm, amn->type) == key) {
>> + r = amn->mn.ops->invalidate_range_start(&amn->mn, mm,
>> + start, end, blockable);
>> + amn->mn.ops->invalidate_range_end(&amn->mn, mm,
>> + start, end);
>> + if (r) {
>> + DRM_ERROR("failed to invalidate %lx\n", start);
>> + break;
>> + }
>> + }
>> +
>> + return r;
>> +}
>> +
>> +#endif
>> +
>> /**
>> * amdgpu_mn_get - create notifier context
>> *
>> @@ -413,7 +457,10 @@ struct amdgpu_mn *amdgpu_mn_get(struct
>> amdgpu_device *adev,
>> mutex_init(&amn->read_lock);
>> atomic_set(&amn->recursion, 0);
>> - r = __mmu_notifier_register(&amn->mn, mm);
>> + if (IS_ENABLED(CONFIG_HMM))
>> + r = amdgpu_hmm_register(&amn->hmm_mirror, mm);
>> + else
>> + r = __mmu_notifier_register(&amn->mn, mm);
>> if (r)
>> goto free_amn;
>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.h
>> b/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.h
>> index eb0f432..c628add 100644
>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.h
>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.h
>> @@ -28,6 +28,7 @@
>> * MMU Notifier
>> */
>> struct amdgpu_mn;
>> +struct hmm_mirror;
>> enum amdgpu_mn_type {
>> AMDGPU_MN_TYPE_GFX,
>> @@ -41,6 +42,11 @@ struct amdgpu_mn *amdgpu_mn_get(struct
>> amdgpu_device *adev,
>> enum amdgpu_mn_type type);
>> int amdgpu_mn_register(struct amdgpu_bo *bo, unsigned long addr);
>> void amdgpu_mn_unregister(struct amdgpu_bo *bo);
>> +int amdgpu_mn_invalidate_range(struct hmm_mirror *mirror,
>> + struct mm_struct *mm,
>> + unsigned long start,
>> + unsigned long end,
>> + bool blockable);
>> #else
>> static inline void amdgpu_mn_lock(struct amdgpu_mn *mn) {}
>> static inline void amdgpu_mn_unlock(struct amdgpu_mn *mn) {}
>
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