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Message-ID: <CAAeHK+zDScw-aYpQFVG=JKartDqCF+ZWnq3-6PuaYgMiBphcJA@mail.gmail.com>
Date: Mon, 6 May 2019 15:50:25 +0200
From: Andrey Konovalov <andreyknvl@...gle.com>
To: "Kuehling, Felix" <Felix.Kuehling@....com>
Cc: "linux-arm-kernel@...ts.infradead.org"
<linux-arm-kernel@...ts.infradead.org>,
"linux-mm@...ck.org" <linux-mm@...ck.org>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"amd-gfx@...ts.freedesktop.org" <amd-gfx@...ts.freedesktop.org>,
"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
"linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
"linux-media@...r.kernel.org" <linux-media@...r.kernel.org>,
"kvm@...r.kernel.org" <kvm@...r.kernel.org>,
"linux-kselftest@...r.kernel.org" <linux-kselftest@...r.kernel.org>,
Catalin Marinas <catalin.marinas@....com>,
Vincenzo Frascino <vincenzo.frascino@....com>,
Will Deacon <will.deacon@....com>,
Mark Rutland <mark.rutland@....com>,
Andrew Morton <akpm@...ux-foundation.org>,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
Kees Cook <keescook@...omium.org>,
Yishai Hadas <yishaih@...lanox.com>,
"Deucher, Alexander" <Alexander.Deucher@....com>,
"Koenig, Christian" <Christian.Koenig@....com>,
Mauro Carvalho Chehab <mchehab@...nel.org>,
Jens Wiklander <jens.wiklander@...aro.org>,
Alex Williamson <alex.williamson@...hat.com>,
Leon Romanovsky <leon@...nel.org>,
Dmitry Vyukov <dvyukov@...gle.com>,
Kostya Serebryany <kcc@...gle.com>,
Evgeniy Stepanov <eugenis@...gle.com>,
Lee Smith <Lee.Smith@....com>,
Ramana Radhakrishnan <Ramana.Radhakrishnan@....com>,
Jacob Bramley <Jacob.Bramley@....com>,
Ruben Ayrapetyan <Ruben.Ayrapetyan@....com>,
Robin Murphy <robin.murphy@....com>,
Chintan Pandya <cpandya@...eaurora.org>,
Luc Van Oostenryck <luc.vanoostenryck@...il.com>,
Dave Martin <Dave.Martin@....com>,
Kevin Brodsky <kevin.brodsky@....com>,
Szabolcs Nagy <Szabolcs.Nagy@....com>
Subject: Re: [PATCH v14 11/17] drm/amdgpu, arm64: untag user pointers
On Tue, Apr 30, 2019 at 8:03 PM Kuehling, Felix <Felix.Kuehling@....com> wrote:
>
> On 2019-04-30 9:25 a.m., Andrey Konovalov wrote:
> > [CAUTION: External Email]
> >
> > This patch is a part of a series that extends arm64 kernel ABI to allow to
> > pass tagged user pointers (with the top byte set to something else other
> > than 0x00) as syscall arguments.
> >
> > amdgpu_ttm_tt_get_user_pages() uses provided user pointers for vma
> > lookups, which can only by done with untagged pointers. This patch
> > untag user pointers when they are being set in
> > amdgpu_ttm_tt_set_userptr().
> >
> > In amdgpu_gem_userptr_ioctl() and amdgpu_amdkfd_gpuvm.c/init_user_pages()
> > an MMU notifier is set up with a (tagged) userspace pointer. The untagged
> > address should be used so that MMU notifiers for the untagged address get
> > correctly matched up with the right BO. This patch untag user pointers in
> > amdgpu_gem_userptr_ioctl() for the GEM case and in
> > amdgpu_amdkfd_gpuvm_alloc_memory_of_gpu() for the KFD case.
> >
> > Suggested-by: Kuehling, Felix <Felix.Kuehling@....com>
> > Signed-off-by: Andrey Konovalov <andreyknvl@...gle.com>
> > ---
> > drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c | 2 +-
> > drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c | 2 ++
> > drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 2 +-
> > 3 files changed, 4 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
> > index 1921dec3df7a..20cac44ed449 100644
> > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
> > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
> > @@ -1121,7 +1121,7 @@ int amdgpu_amdkfd_gpuvm_alloc_memory_of_gpu(
> > alloc_flags = 0;
> > if (!offset || !*offset)
> > return -EINVAL;
> > - user_addr = *offset;
> > + user_addr = untagged_addr(*offset);
> > } else if (flags & ALLOC_MEM_FLAGS_DOORBELL) {
> > domain = AMDGPU_GEM_DOMAIN_GTT;
> > alloc_domain = AMDGPU_GEM_DOMAIN_CPU;
> > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
> > index d21dd2f369da..985cb82b2aa6 100644
> > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
> > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
> > @@ -286,6 +286,8 @@ int amdgpu_gem_userptr_ioctl(struct drm_device *dev, void *data,
> > uint32_t handle;
> > int r;
> >
> > + args->addr = untagged_addr(args->addr);
> > +
> > if (offset_in_page(args->addr | args->size))
> > return -EINVAL;
> >
> > diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
> > index 73e71e61dc99..1d30e97ac2c4 100644
> > --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
> > +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
> > @@ -1248,7 +1248,7 @@ int amdgpu_ttm_tt_set_userptr(struct ttm_tt *ttm, uint64_t addr,
> > if (gtt == NULL)
> > return -EINVAL;
> >
> > - gtt->userptr = addr;
> > + gtt->userptr = untagged_addr(addr);
>
> Doing this here seems unnecessary. You already untagged the address in
> both callers of this function. Untagging in the two callers ensures that
> the userptr and MMU notifier are in sync, using the same untagged
> address. Doing it again here is redundant.
Will fix in v15, thanks!
>
> Regards,
> Felix
>
>
> > gtt->userflags = flags;
> >
> > if (gtt->usertask)
> > --
> > 2.21.0.593.g511ec345e18-goog
> >
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