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[216.228.112.22]) by smtp.gmail.com with ESMTPSA id u3sm44695365pjn.5.2019.07.25.16.42.07 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Thu, 25 Jul 2019 16:42:07 -0700 (PDT) Date: Thu, 25 Jul 2019 16:42:51 -0700 From: Nicolin Chen To: Dafna Hirschfeld Subject: Re: [PATCH v3 1/2] dma-contiguous: Abstract dma_{alloc,free}_contiguous() Message-ID: <20190725234250.GA15714@Asurada-Nvidia.nvidia.com> References: <20190524040633.16854-1-nicoleotsuka@gmail.com> <20190524040633.16854-2-nicoleotsuka@gmail.com> <20190725165015.GA31961@Asurada-Nvidia.nvidia.com> <1564075865.2339.6.camel@collabora.com> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <1564075865.2339.6.camel@collabora.com> User-Agent: Mutt/1.9.4 (2018-02-28) Cc: Tony Lindgren , Catalin Marinas , Will Deacon , jcmvbkbc@gmail.com, hch@lst.de, sfr@canb.auug.org.au, dann.frazier@canonical.com, Russell King , hans.verkuil@cisco.com, Ezequiel Garcia , treding@nvidia.com, linux-media@vger.kernel.org, linux-xtensa@linux-xtensa.org, keescook@chromium.org, Andrew Morton , linux-arm-kernel , chris@zankel.net, wsa+renesas@sang-engineering.com, robin.murphy@arm.com, Linux Kernel Mailing List , iommu@lists.linux-foundation.org, iamjoonsoo.kim@lge.com, David Woodhouse X-BeenThere: iommu@lists.linux-foundation.org X-Mailman-Version: 2.1.12 Precedence: list List-Id: Development issues for Linux IOMMU support List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Sender: iommu-bounces@lists.linux-foundation.org Errors-To: iommu-bounces@lists.linux-foundation.org On Thu, Jul 25, 2019 at 07:31:05PM +0200, Dafna Hirschfeld wrote: > On Thu, 2019-07-25 at 09:50 -0700, Nicolin Chen wrote: > > On Thu, Jul 25, 2019 at 01:06:42PM -0300, Ezequiel Garcia wrote: > > > I can't find a way to forward-redirect from Gmail, so I'm Ccing Dafna > > > who found a regression caused by this commit. Dafna, can you give all > > > the details, including the log and how you are reproducing it? > > = > > I saw the conversation there. Sorry for not replying yet. > > May we discuss there since there are full logs available? > > = > > Thanks > > Nicolin > > = > = > Hi, > I compiled vivid as built-in into the kernel (not as a separate module) f= or nitrogen8m device (imx8) and > set it to use contig dma for mem_ops by adding the kernel param > vivid.allocators=3D1,1,... > = > I use this devicetree patch for the dtb file: https://lkml.org/lkml/2019/= 7/24/789. Although it should > be the same on any Aarch64 platform. > = > Then, on the board I run the command: > = > v4l2-ctl -d3 -v width=3D2592,height=3D1944,pixelformat=3DUYVY,bytesperlin= e=3D5184 --stream-mmap --stream-to video.UYVY > = > In every run there is a different crash. Here is one of them: https://pas= tebin.com/xXgbXMAN This probably should be a fix: https://lkml.org/lkml/2019/7/25/1432 I also sent it to you. Would it be possible for you to test it? Thanks Nicolin > = > Dafna > > > = > > > = > > > > > On Fri, 24 May 2019 at 01:08, Nicolin Chen wrote: > > > > = > > > > Both dma_alloc_from_contiguous() and dma_release_from_contiguous() > > > > are very simply implemented, but requiring callers to pass certain > > > > parameters like count and align, and taking a boolean parameter to > > > > check __GFP_NOWARN in the allocation flags. So every function call > > > > duplicates similar work: > > > > =A0 /* A piece of example */ > > > > =A0 unsigned long order =3D get_order(size); > > > > =A0 size_t count =3D size >> PAGE_SHIFT; > > > > =A0 page =3D dma_alloc_from_contiguous(dev, count, order, gfp & __G= FP_NOWARN); > > > > =A0 [...] > > > > =A0 dma_release_from_contiguous(dev, page, size >> PAGE_SHIFT); > > > > = > > > > Additionally, as CMA can be used only in the context which permits > > > > sleeping, most of callers do a gfpflags_allow_blocking() check and > > > > a corresponding fallback allocation of normal pages upon any false > > > > result: > > > > =A0 /* A piece of example */ > > > > =A0 if (gfpflags_allow_blocking(flag)) > > > > =A0=A0=A0=A0=A0=A0page =3D dma_alloc_from_contiguous(); > > > > =A0 if (!page) > > > > =A0=A0=A0=A0=A0=A0page =3D alloc_pages(); > > > > =A0 [...] > > > > =A0 if (!dma_release_from_contiguous(dev, page, count)) > > > > =A0=A0=A0=A0=A0=A0__free_pages(page, get_order(size)); > > > > = > > > > So this patch simplifies those function calls by abstracting these > > > > operations into the two new functions: dma_{alloc,free}_contiguous. > > > > = > > > > As some callers of dma_{alloc,release}_from_contiguous() might be > > > > complicated, this patch just implements these two new functions to > > > > kernel/dma/direct.c only as an initial step. > > > > = > > > > > > > Suggested-by: Christoph Hellwig > > > > > > > Signed-off-by: Nicolin Chen > > > > --- > > > > Changelog > > > > v2->v3: > > > > =A0* Added missing "static inline" in header file to fix build erro= r. > > > > v1->v2: > > > > =A0* Added new functions beside the old ones so we can replace call= ers > > > > =A0=A0=A0one by one later. > > > > =A0* Applied new functions to dma/direct.c only, because it's the b= est > > > > =A0=A0=A0example caller to apply and should be safe with the new fu= nctions. > > > > = > > > > =A0include/linux/dma-contiguous.h | 11 ++++++++ > > > > =A0kernel/dma/contiguous.c=A0=A0=A0=A0=A0=A0=A0=A0| 48 ++++++++++++= ++++++++++++++++++++++ > > > > =A0kernel/dma/direct.c=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0| 24 +++-= ------------- > > > > =A03 files changed, 63 insertions(+), 20 deletions(-) > > > > = > > > > diff --git a/include/linux/dma-contiguous.h b/include/linux/dma-con= tiguous.h > > > > index f247e8aa5e3d..00a370c1c140 100644 > > > > --- a/include/linux/dma-contiguous.h > > > > +++ b/include/linux/dma-contiguous.h > > > > @@ -115,6 +115,8 @@ struct page *dma_alloc_from_contiguous(struct d= evice *dev, size_t count, > > > > =A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0= =A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0unsigned int order, bool= no_warn); > > > > =A0bool dma_release_from_contiguous(struct device *dev, struct page= *pages, > > > > =A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0= =A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0int count); > > > > +struct page *dma_alloc_contiguous(struct device *dev, size_t size,= gfp_t gfp); > > > > +void dma_free_contiguous(struct device *dev, struct page *page, si= ze_t size); > > > > = > > > > =A0#else > > > > = > > > > @@ -157,6 +159,15 @@ bool dma_release_from_contiguous(struct device= *dev, struct page *pages, > > > > =A0=A0=A0=A0=A0=A0=A0=A0return false; > > > > =A0} > > > > = > > > > +static inline > > > > +struct page *dma_alloc_contiguous(struct device *dev, size_t size,= gfp_t gfp) > > > > +{ > > > > +=A0=A0=A0=A0=A0=A0=A0return NULL; > > > > +} > > > > + > > > > +static inline > > > > +void dma_free_contiguous(struct device *dev, struct page *page, si= ze_t size) { } > > > > + > > > > =A0#endif > > > > = > > > > =A0#endif > > > > diff --git a/kernel/dma/contiguous.c b/kernel/dma/contiguous.c > > > > index b2a87905846d..21f39a6cb04f 100644 > > > > --- a/kernel/dma/contiguous.c > > > > +++ b/kernel/dma/contiguous.c > > > > @@ -214,6 +214,54 @@ bool dma_release_from_contiguous(struct device= *dev, struct page *pages, > > > > =A0=A0=A0=A0=A0=A0=A0=A0return cma_release(dev_get_cma_area(dev), p= ages, count); > > > > =A0} > > > > = > > > > +/** > > > > + * dma_alloc_contiguous() - allocate contiguous pages > > > > + * @dev:=A0=A0=A0Pointer to device for which the allocation is per= formed. > > > > + * @size:=A0=A0Requested allocation size. > > > > + * @gfp:=A0=A0=A0Allocation flags. > > > > + * > > > > + * This function allocates contiguous memory buffer for specified = device. It > > > > + * first tries to use device specific contiguous memory area if av= ailable or > > > > + * the default global one, then tries a fallback allocation of nor= mal pages. > > > > + */ > > > > +struct page *dma_alloc_contiguous(struct device *dev, size_t size,= gfp_t gfp) > > > > +{ > > > > +=A0=A0=A0=A0=A0=A0=A0int node =3D dev ? dev_to_node(dev) : NUMA_NO= _NODE; > > > > +=A0=A0=A0=A0=A0=A0=A0size_t count =3D PAGE_ALIGN(size) >> PAGE_SHI= FT; > > > > +=A0=A0=A0=A0=A0=A0=A0size_t align =3D get_order(PAGE_ALIGN(size)); > > > > +=A0=A0=A0=A0=A0=A0=A0struct cma *cma =3D dev_get_cma_area(dev); > > > > +=A0=A0=A0=A0=A0=A0=A0struct page *page =3D NULL; > > > > + > > > > +=A0=A0=A0=A0=A0=A0=A0/* CMA can be used only in the context which = permits sleeping */ > > > > +=A0=A0=A0=A0=A0=A0=A0if (cma && gfpflags_allow_blocking(gfp)) { > > > > +=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0align =3D min_t(size_= t, align, CONFIG_CMA_ALIGNMENT); > > > > +=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0page =3D cma_alloc(cm= a, count, align, gfp & __GFP_NOWARN); > > > > +=A0=A0=A0=A0=A0=A0=A0} > > > > + > > > > +=A0=A0=A0=A0=A0=A0=A0/* Fallback allocation of normal pages */ > > > > +=A0=A0=A0=A0=A0=A0=A0if (!page) > > > > +=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0page =3D alloc_pages_= node(node, gfp, align); > > > > + > > > > +=A0=A0=A0=A0=A0=A0=A0return page; > > > > +} > > > > + > > > > +/** > > > > + * dma_free_contiguous() - release allocated pages > > > > + * @dev:=A0=A0=A0Pointer to device for which the pages were alloca= ted. > > > > + * @page:=A0=A0Pointer to the allocated pages. > > > > + * @size:=A0=A0Size of allocated pages. > > > > + * > > > > + * This function releases memory allocated by dma_alloc_contiguous= (). As the > > > > + * cma_release returns false when provided pages do not belong to = contiguous > > > > + * area and true otherwise, this function then does a fallback __f= ree_pages() > > > > + * upon a false-return. > > > > + */ > > > > +void dma_free_contiguous(struct device *dev, struct page *page, si= ze_t size) > > > > +{ > > > > +=A0=A0=A0=A0=A0=A0=A0if (!cma_release(dev_get_cma_area(dev), page,= size >> PAGE_SHIFT)) > > > > +=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0__free_pages(page, ge= t_order(size)); > > > > +} > > > > + > > > > =A0/* > > > > =A0 * Support for reserved memory regions defined in device tree > > > > =A0 */ > > > > diff --git a/kernel/dma/direct.c b/kernel/dma/direct.c > > > > index 2c2772e9702a..0816c1e8b05a 100644 > > > > --- a/kernel/dma/direct.c > > > > +++ b/kernel/dma/direct.c > > > > @@ -96,8 +96,6 @@ static bool dma_coherent_ok(struct device *dev, p= hys_addr_t phys, size_t size) > > > > =A0struct page *__dma_direct_alloc_pages(struct device *dev, size_t= size, > > > > =A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0dma_addr_t *dma_han= dle, gfp_t gfp, unsigned long attrs) > > > > =A0{ > > > > -=A0=A0=A0=A0=A0=A0=A0unsigned int count =3D PAGE_ALIGN(size) >> PA= GE_SHIFT; > > > > -=A0=A0=A0=A0=A0=A0=A0int page_order =3D get_order(size); > > > > =A0=A0=A0=A0=A0=A0=A0=A0struct page *page =3D NULL; > > > > =A0=A0=A0=A0=A0=A0=A0=A0u64 phys_mask; > > > > = > > > > @@ -109,20 +107,9 @@ struct page *__dma_direct_alloc_pages(struct d= evice *dev, size_t size, > > > > =A0=A0=A0=A0=A0=A0=A0=A0gfp |=3D __dma_direct_optimal_gfp_mask(dev,= dev->coherent_dma_mask, > > > > =A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0= =A0=A0&phys_mask); > > > > =A0again: > > > > -=A0=A0=A0=A0=A0=A0=A0/* CMA can be used only in the context which = permits sleeping */ > > > > -=A0=A0=A0=A0=A0=A0=A0if (gfpflags_allow_blocking(gfp)) { > > > > -=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0page =3D dma_alloc_fr= om_contiguous(dev, count, page_order, > > > > -=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0= =A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0= =A0gfp & __GFP_NOWARN); > > > > -=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0if (page && !dma_cohe= rent_ok(dev, page_to_phys(page), size)) { > > > > -=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0= =A0dma_release_from_contiguous(dev, page, count); > > > > -=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0= =A0page =3D NULL; > > > > -=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0} > > > > -=A0=A0=A0=A0=A0=A0=A0} > > > > -=A0=A0=A0=A0=A0=A0=A0if (!page) > > > > -=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0page =3D alloc_pages_= node(dev_to_node(dev), gfp, page_order); > > > > - > > > > +=A0=A0=A0=A0=A0=A0=A0page =3D dma_alloc_contiguous(dev, size, gfp); > > > > =A0=A0=A0=A0=A0=A0=A0=A0if (page && !dma_coherent_ok(dev, page_to_p= hys(page), size)) { > > > > -=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0__free_pages(page, pa= ge_order); > > > > +=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0dma_free_contiguous(d= ev, page, size); > > > > =A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0page =3D NULL; > > > > = > > > > =A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0if (IS_ENABLED(CONF= IG_ZONE_DMA32) && > > > > @@ -154,7 +141,7 @@ void *dma_direct_alloc_pages(struct device *dev= , size_t size, > > > > =A0=A0=A0=A0=A0=A0=A0=A0if (PageHighMem(page)) { > > > > =A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0/* > > > > =A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0* Depending on t= he cma=3D arguments and per-arch setup > > > > -=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0* dma_alloc_from_c= ontiguous could return highmem pages. > > > > +=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0* dma_alloc_contig= uous could return highmem pages. > > > > =A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0* Without remapp= ing there is no way to return them here, > > > > =A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0* so log an erro= r and fail. > > > > =A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0*/ > > > > @@ -176,10 +163,7 @@ void *dma_direct_alloc_pages(struct device *de= v, size_t size, > > > > = > > > > =A0void __dma_direct_free_pages(struct device *dev, size_t size, st= ruct page *page) > > > > =A0{ > > > > -=A0=A0=A0=A0=A0=A0=A0unsigned int count =3D PAGE_ALIGN(size) >> PA= GE_SHIFT; > > > > - > > > > -=A0=A0=A0=A0=A0=A0=A0if (!dma_release_from_contiguous(dev, page, c= ount)) > > > > -=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0__free_pages(page, ge= t_order(size)); > > > > +=A0=A0=A0=A0=A0=A0=A0dma_free_contiguous(dev, page, size); > > > > =A0} > > > > = > > > > =A0void dma_direct_free_pages(struct device *dev, size_t size, void= *cpu_addr, > > > > -- > > > > 2.17.1 > > > > = _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu