Linaro-mm-sig

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15 participants
3025 discussions

[PATCH 0/2] ARM: Remove lowmem limit for default CMA region

by Marek Szyprowski

Hello, Russell King recently noticed that limiting default CMA region only to low memory on ARM architecture causes serious memory management issues with machines having a lot of memory (which is mainly available as high memory). More information can be found the following thread: http://thread.gmane.org/gmane.linux.ports.arm.kernel/348441/ Those two patches removes this limit letting kernel to put default CMA region into high memory when this is possible (there is enough high memory available and architecture specific DMA limit fits). This should solve strange OOM issues on systems with lots of RAM (i.e. >1GiB) and large (>256M) CMA area. Best regards Marek Szyprowski Samsung R&D Institute Poland Marek Szyprowski (2): mm: cma: adjust address limit to avoid hitting low/high memory boundary ARM: mm: don't limit default CMA region only to low memory arch/arm/mm/init.c | 2 +- mm/cma.c | 21 +++++++++++++++++++++ 2 files changed, 22 insertions(+), 1 deletion(-) -- 1.9.2

11 years

[PATCH v2 0/4] CMA & device tree, once again

by Marek Szyprowski

Hello, This is one more respin of the patches which add support for creating reserved memory regions defined in device tree. The last attempt (http://lists.linaro.org/pipermail/linaro-mm-sig/2014-February/003738.html) ended in merging only half of the code, so right now we have complete documentation merged and only basic code, which implements a half of it is written in the documentation. Although the merged patches allow to reserve memory, there is no way of using it for devices and drivers. This situation makes CMA rather useless, as the main architecture (ARM), which used it, has been converted from board-file based system initialization to device tree. Thus there is no place to use direct calls to dma_declare_contiguous() and some new solution, which bases on device tree, is urgently needed. This patch series fixes this issue. It provides two, already widely discussed and already present in the kernel, drivers for reserved memory: first based on DMA-coherent allocator, second using Contiguous Memory Allocator. The first one nicely implements typical 'carved out' reserved memory way of allocating contiguous buffers in a kernel-style way. The memory is used exclusively by devices assigned to the given memory region. The second one allows to reuse reserved memory for movable kernel pages (like disk buffers, anonymous memory) and migrates it out when device to allocates contiguous memory buffer. Both driver provides memory buffers via standard dma-mapping API. The patches have been rebased on top of latest CMA and mm changes merged to akmp kernel tree. To define a 64MiB CMA region following node is needed: multimedia_reserved: multimedia_mem_region { compatible = "shared-dma-pool"; reusable; size = <0x4000000>; alignment = <0x400000>; }; Similarly, one can define 64MiB region with DMA coherent memory: multimedia_reserved: multimedia_mem_region { compatible = "shared-dma-pool"; no-map; size = <0x4000000>; alignment = <0x400000>; }; Then the defined region can be assigned to devices: scaler: scaler@12500000 { memory-region = <&multimedia_reserved>; /* ... */ }; codec: codec@12600000 { memory-region = <&multimedia_reserved>; /* ... */ }; Best regards Marek Szyprowski Samsung R&D Institute Poland Changes since v1: (http://www.spinics.net/lists/arm-kernel/msg343702.html) - fixed possible memory leak in case of reserved memory allocation failure (thanks to Joonsoo Kim) Changes since the version posted in '[PATCH v6 00/11] reserved-memory regions/CMA in devicetree, again' thread http://lists.linaro.org/pipermail/linaro-mm-sig/2014-February/003738.html: - rebased on top of '[PATCH v3 -next 0/9] CMA: generalize CMA reserved area management code' patch series on v3.16-rc3 - improved dma-coherent driver, now it correctly handles assigning more than one device to the given memory region Patch summary: Marek Szyprowski (4): drivers: of: add automated assignment of reserved regions to client devices drivers: of: initialize and assign reserved memory to newly created devices drivers: dma-coherent: add initialization from device tree drivers: dma-contiguous: add initialization from device tree drivers/base/dma-coherent.c | 40 +++++++++++++++++++++++ drivers/base/dma-contiguous.c | 60 +++++++++++++++++++++++++++++++++++ drivers/of/of_reserved_mem.c | 70 +++++++++++++++++++++++++++++++++++++++++ drivers/of/platform.c | 7 +++++ include/linux/cma.h | 3 ++ include/linux/of_reserved_mem.h | 7 +++++ mm/cma.c | 62 +++++++++++++++++++++++++++++------- 7 files changed, 238 insertions(+), 11 deletions(-) -- 1.9.2

11 years

[git pull] sti driver fixes 3.17-rc2

by Benjamin Gaignard

Hello David, I have tested the 6 patches send on mailing list since you merge the sti driver. I haven't seen issue with those patches except for the missing dependency on Kconfig where I have change "depends on" to "select". You can found the patches in this directory: git://git.linaro.org/people/benjamin.gaignard/kernel.git on drm-3.17-rc2-sti-fixes branch. Regards, Benjamin Jingoo Han (1): drm: sti: Add missing dependency on RESET_CONTROLLER Kiran Padwal (1): drm: sti: Make of_device_id array const Wei Yongjun (4): drm: sti: tvout: fix return value check in sti_tvout_probe() drm: sti: hdmi: fix return value check in sti_hdmi_probe() drm: sti: hda: fix return value check in sti_hda_probe() drm: sti: Fix return value check in sti_drm_platform_probe() drivers/gpu/drm/sti/Kconfig | 1 + drivers/gpu/drm/sti/sti_drm_drv.c | 4 ++-- drivers/gpu/drm/sti/sti_hda.c | 10 +++++----- drivers/gpu/drm/sti/sti_hdmi.c | 10 +++++----- drivers/gpu/drm/sti/sti_tvout.c | 6 +++--- 5 files changed, 16 insertions(+), 15 deletions(-) -- 1.9.1

11 years

[PATCH 0/7] CMA & device tree, another approach

by Marek Szyprowski

Hello, This is another approach to finish support for reserved memory regions defined in device tree. Previous attempts (http://lists.linaro.org/pipermail/linaro-mm-sig/2014-February/003738.html and https://lkml.org/lkml/2014/7/14/108) ended in merging parts of the code and documentation. Merged patches allow to reserve memory, but there is still no reserved memory drivers nor any code that actually uses reserved memory regions. The final conclusion from the above mentioned threads is that there is no automated reserved memory initialization. All drivers that want to use reserved memory, should initialize it on their own. This patch series provides two driver for reserved memory regions (one based on CMA and one based on dma_coherent allocator). The main improvement comparing to the previous version is removal of automated reserved memory for every device and support for named memory regions. Support for more than one reserved memory region can be considered as a separate DMA address space, so support for more than one region per device has been implemented the same way as support for separate IO/DMA address spaces in my Exynos IOMMU dma-mapping proposal: http://thread.gmane.org/gmane.linux.kernel.samsung-soc/36079 Best regards Marek Szyprowski Samsung R&D Institute Poland Changes since '[PATCH v2 RESEND 0/4] CMA & device tree, once again' version: (https://lkml.org/lkml/2014/7/14/108) - added return error value to of_reserved_mem_device_init() - added support for named memory regions (so more than one region can be defined per device) - added usage example - converted custom reserved memory code used by s5p-mfc driver to the generic reserved memory handling code Patch summary: Marek Szyprowski (7): drivers: of: add return value to of_reserved_mem_device_init drivers: of: add support for named memory regions drivers: dma-coherent: add initialization from device tree drivers: dma-contiguous: add initialization from device tree media: s5p-mfc: replace custom reserved memory init code with generic one ARM: Exynos: convert MFC to generic reserved memory bindings ARM: DTS: exynos4412-odroid*: enable MFC device .../devicetree/bindings/media/s5p-mfc.txt | 16 +-- .../bindings/reserved-memory/reserved-memory.txt | 6 +- arch/arm/boot/dts/exynos4210-origen.dts | 22 +++- arch/arm/boot/dts/exynos4210-smdkv310.dts | 22 +++- arch/arm/boot/dts/exynos4412-odroid-common.dtsi | 24 ++++ arch/arm/boot/dts/exynos4412-origen.dts | 22 +++- arch/arm/boot/dts/exynos4412-smdk4412.dts | 22 +++- arch/arm/boot/dts/exynos5250-arndale.dts | 22 +++- arch/arm/boot/dts/exynos5250-smdk5250.dts | 22 +++- arch/arm/boot/dts/exynos5420-arndale-octa.dts | 22 +++- arch/arm/boot/dts/exynos5420-smdk5420.dts | 22 +++- arch/arm/mach-exynos/exynos.c | 18 --- arch/arm/mach-exynos/mfc.h | 16 --- arch/arm/plat-samsung/Kconfig | 5 - arch/arm/plat-samsung/Makefile | 1 - arch/arm/plat-samsung/s5p-dev-mfc.c | 94 -------------- drivers/base/dma-coherent.c | 138 ++++++++++++++++++--- drivers/base/dma-contiguous.c | 71 +++++++++++ drivers/media/platform/s5p-mfc/s5p_mfc.c | 102 ++++++--------- drivers/of/of_reserved_mem.c | 102 ++++++++++----- include/linux/cma.h | 3 + include/linux/of_reserved_mem.h | 9 +- mm/cma.c | 62 +++++++-- 23 files changed, 552 insertions(+), 291 deletions(-) delete mode 100644 arch/arm/mach-exynos/mfc.h delete mode 100644 arch/arm/plat-samsung/s5p-dev-mfc.c -- 1.9.2

11 years

[PATCH v2] dma-mapping: Provide write-combine allocations

by Thierry Reding

From: Thierry Reding <treding(a)nvidia.com> Provide an implementation for dma_{alloc,free,mmap}_writecombine() when the architecture supports DMA attributes. Signed-off-by: Thierry Reding <treding(a)nvidia.com> --- Changes in v2: - Add a generic dma_mmap_writecombine() function arch/arm/include/asm/dma-mapping.h | 16 ---------------- include/asm-generic/dma-mapping-common.h | 8 -------- include/linux/dma-mapping.h | 26 ++++++++++++++++++++++++++ 3 files changed, 26 insertions(+), 24 deletions(-) diff --git a/arch/arm/include/asm/dma-mapping.h b/arch/arm/include/asm/dma-mapping.h index c45b61a4b4a5..85738b200023 100644 --- a/arch/arm/include/asm/dma-mapping.h +++ b/arch/arm/include/asm/dma-mapping.h @@ -265,22 +265,6 @@ extern int arm_dma_mmap(struct device *dev, struct vm_area_struct *vma, void *cpu_addr, dma_addr_t dma_addr, size_t size, struct dma_attrs *attrs); -static inline void *dma_alloc_writecombine(struct device *dev, size_t size, - dma_addr_t *dma_handle, gfp_t flag) -{ - DEFINE_DMA_ATTRS(attrs); - dma_set_attr(DMA_ATTR_WRITE_COMBINE, &attrs); - return dma_alloc_attrs(dev, size, dma_handle, flag, &attrs); -} - -static inline void dma_free_writecombine(struct device *dev, size_t size, - void *cpu_addr, dma_addr_t dma_handle) -{ - DEFINE_DMA_ATTRS(attrs); - dma_set_attr(DMA_ATTR_WRITE_COMBINE, &attrs); - return dma_free_attrs(dev, size, cpu_addr, dma_handle, &attrs); -} - /* * This can be called during early boot to increase the size of the atomic * coherent DMA pool above the default value of 256KiB. It must be called diff --git a/include/asm-generic/dma-mapping-common.h b/include/asm-generic/dma-mapping-common.h index de8bf89940f8..d137431bf26f 100644 --- a/include/asm-generic/dma-mapping-common.h +++ b/include/asm-generic/dma-mapping-common.h @@ -205,14 +205,6 @@ dma_mmap_attrs(struct device *dev, struct vm_area_struct *vma, void *cpu_addr, #define dma_mmap_coherent(d, v, c, h, s) dma_mmap_attrs(d, v, c, h, s, NULL) -static inline int dma_mmap_writecombine(struct device *dev, struct vm_area_struct *vma, - void *cpu_addr, dma_addr_t dma_addr, size_t size) -{ - DEFINE_DMA_ATTRS(attrs); - dma_set_attr(DMA_ATTR_WRITE_COMBINE, &attrs); - return dma_mmap_attrs(dev, vma, cpu_addr, dma_addr, size, &attrs); -} - int dma_common_get_sgtable(struct device *dev, struct sg_table *sgt, void *cpu_addr, dma_addr_t dma_addr, size_t size); diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h index 931b70986272..d5d388160f42 100644 --- a/include/linux/dma-mapping.h +++ b/include/linux/dma-mapping.h @@ -263,6 +263,32 @@ struct dma_attrs; #define dma_unmap_sg_attrs(dev, sgl, nents, dir, attrs) \ dma_unmap_sg(dev, sgl, nents, dir) +#else +static inline void *dma_alloc_writecombine(struct device *dev, size_t size, + dma_addr_t *dma_addr, gfp_t gfp) +{ + DEFINE_DMA_ATTRS(attrs); + dma_set_attr(DMA_ATTR_WRITE_COMBINE, &attrs); + return dma_alloc_attrs(dev, size, dma_addr, gfp, &attrs); +} + +static inline void dma_free_writecombine(struct device *dev, size_t size, + void *cpu_addr, dma_addr_t dma_addr) +{ + DEFINE_DMA_ATTRS(attrs); + dma_set_attr(DMA_ATTR_WRITE_COMBINE, &attrs); + return dma_free_attrs(dev, size, cpu_addr, dma_addr, &attrs); +} + +static inline int dma_mmap_writecombine(struct device *dev, + struct vm_area_struct *vma, + void *cpu_addr, dma_addr_t dma_addr, + size_t size) +{ + DEFINE_DMA_ATTRS(attrs); + dma_set_attr(DMA_ATTR_WRITE_COMBINE, &attrs); + return dma_mmap_attrs(dev, vma, cpu_addr, dma_addr, size, &attrs); +} #endif /* CONFIG_HAVE_DMA_ATTRS */ #ifdef CONFIG_NEED_DMA_MAP_STATE -- 2.0.0

11 years

Re: [Linaro-mm-sig] [PATCH] dma-buf: fix <linux/seqno-fence.h> kernel-doc warning

by Sumit Semwal

Hi Randy, ~ typing on a mobile device, kindly excuse any typos On Aug 17, 2014 2:45 AM, "Randy Dunlap" <rdunlap(a)infradead.org> wrote: > > From: Randy Dunlap <rdunlap(a)infradead.org> > > Fix kernel-doc warning, missing parameter description: > > Warning(..//include/linux/seqno-fence.h:99): No description found for parameter 'cond' Thanks for your patch; this is already fixed by Thierry Reading's patch and is queued in for-next. [1] > > Signed-off-by: Randy Dunlap <rdunlap(a)infradead.org> > Cc: Rob Clark <robdclark(a)gmail.com> > Cc: Maarten Lankhorst <maarten.lankhorst(a)canonical.com> > --- > include/linux/seqno-fence.h | 1 + > 1 file changed, 1 insertion(+) > > Index: lnx-317-rc1/include/linux/seqno-fence.h > =================================================================== > --- lnx-317-rc1.orig/include/linux/seqno-fence.h > +++ lnx-317-rc1/include/linux/seqno-fence.h > @@ -62,6 +62,7 @@ to_seqno_fence(struct fence *fence) > * @context: the execution context this fence is a part of > * @seqno_ofs: the offset within @sync_buf > * @seqno: the sequence # to signal on > + * @cond: the fence condition to check > * @ops: the fence_ops for operations on this seqno fence > * > * This function initializes a struct seqno_fence with passed parameters, Best regards, Sumit. [1]: https://lkml.org/lkml/2014/8/8/191

11 years

[PATCH] dma-buf/fence: Fix one more kerneldoc warning

by Thierry Reding

From: Thierry Reding <treding(a)nvidia.com> The seqno_fence_init() function's cond argument isn't described in the kerneldoc comment. Fix that to silence a warning when building DocBook documentation. Signed-off-by: Thierry Reding <treding(a)nvidia.com> --- include/linux/seqno-fence.h | 1 + 1 file changed, 1 insertion(+) diff --git a/include/linux/seqno-fence.h b/include/linux/seqno-fence.h index 3d6003de4b0d..a1ba6a5ccdd6 100644 --- a/include/linux/seqno-fence.h +++ b/include/linux/seqno-fence.h @@ -62,6 +62,7 @@ to_seqno_fence(struct fence *fence) * @context: the execution context this fence is a part of * @seqno_ofs: the offset within @sync_buf * @seqno: the sequence # to signal on + * @cond: fence wait condition * @ops: the fence_ops for operations on this seqno fence * * This function initializes a struct seqno_fence with passed parameters, -- 2.0.4

11 years, 1 month

[PATCH] dma-buf/fence: Fix a kerneldoc warning

by Thierry Reding

From: Thierry Reding <treding(a)nvidia.com> kerneldoc doesn't know how to parse variables, so don't let it try. Signed-off-by: Thierry Reding <treding(a)nvidia.com> --- drivers/dma-buf/fence.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/dma-buf/fence.c b/drivers/dma-buf/fence.c index 4222cb2aa96a..7bb9d65d9a2c 100644 --- a/drivers/dma-buf/fence.c +++ b/drivers/dma-buf/fence.c @@ -29,7 +29,7 @@ EXPORT_TRACEPOINT_SYMBOL(fence_annotate_wait_on); EXPORT_TRACEPOINT_SYMBOL(fence_emit); -/** +/* * fence context counter: each execution context should have its own * fence context, this allows checking if fences belong to the same * context or not. One device can have multiple separate contexts, -- 2.0.4

11 years, 1 month

Re: [Linaro-mm-sig] [linux-3.10.17] Could not allocate memory from free CMA areas

by pintu_agarwal

Dear Joonsoo, I tried your changes which are present at the below link. https://github.com/JoonsooKim/linux/tree/cma-fix-up-v3.0-next-20140625 But unfortunately for me it did not help much. After running various apps that uses ION nonmovable memory, it fails to allocate memory after some time. When I see the pagetypeinfo shows lots of CMA pages available and non-movable were very less and thus nonmovable allocation were failing. However I noticed the failure was little delayed. Also I noticed that the CMA utilized and the CMA free is not matching with total CMA size. In my system RAM is 256MB and CMA configured is 56MB. And free memory was hanging around 30-40MB during failure. Am I missing something? My kernel version is 3.10 and I applied the changes manually. If there are other sets of patches that needs to be applied, please let me know. Note, I did not apply the ALLOC_CMA removal patches. Now I am experimenting more and will share if I have any findings. Thank you! Pintu Sent from Samsung Mobile -------- Original message -------- From: Joonsoo Kim <iamjoonsoo.kim(a)lge.com> Date: 29/07/2014 5:06 PM (GMT+09:00) To: 'pintu_agarwal' <pintu_agarwal(a)yahoo.com>,linux-mm@kvack.org,linux-arm-kernel@lists.infradead.org,linaro-mm-sig@lists.linaro.org,ritesh.list@gmail.com Cc: pintu.k@outlook.com,pintu.k@samsung.com,vishu_1385@yahoo.com,m.szyprowski@samsung.com,mina86@mina86.com,ngupta@vflare.org,iqbalblr@gmail.com Subject: RE: [linux-3.10.17] Could not allocate memory from free CMA areas From: pintu_agarwal [mailto:pintu_agarwal@yahoo.com] Sent: Friday, July 25, 2014 12:15 AM To: PINTU KUMAR; linux-mm(a)kvack.org; linux-arm-kernel(a)lists.infradead.org; linaro-mm-sig(a)lists.linaro.org; iamjoonsoo.kim(a)lge.com; ritesh.list(a)gmail.com Cc: pintu.k(a)outlook.com; pintu.k(a)samsung.com; vishu_1385(a)yahoo.com; m.szyprowski(a)samsung.com; mina86(a)mina86.com; ngupta(a)vflare.org; iqbalblr(a)gmail.com Subject: RE: [linux-3.10.17] Could not allocate memory from free CMA areas Dear joonsoo kim, > I have your patches for: Aggressively allocate memory from cma .... > We are facing almost similar problem here. > If any of your patches still working for you please let us know here. > I would like to try those approach. Hello, I stopped to implement it, because there are other bugs on CMA related codes. Although aggressively allocate... doesn't have bugs itself, it enlarges existing freepage counting bugs significantly so I'm first trying to fix those bugs. See the below link. https://lkml.org/lkml/2014/7/4/79 I will restart to implement aggressively... after fixing these bugs. If you have interest on next version of aggressively allocate..., see the following link. https://github.com/JoonsooKim/linux/tree/cma-fix-up-v3.0-next-20140625 Thanks.

11 years, 1 month

[PATCH v2 RESEND 0/4] CMA & device tree, once again

by Marek Szyprowski

Hello, (please ignore previous patchset, I've attached wrong version of patches) This is one more respin of the patches which add support for creating reserved memory regions defined in device tree. The last attempt (http://lists.linaro.org/pipermail/linaro-mm-sig/2014-February/003738.html) ended in merging only half of the code, so right now we have complete documentation merged and only basic code, which implements a half of it is written in the documentation. Although the merged patches allow to reserve memory, there is no way of using it for devices and drivers. This situation makes CMA rather useless, as the main architecture (ARM), which used it, has been converted from board-file based system initialization to device tree. Thus there is no place to use direct calls to dma_declare_contiguous() and some new solution, which bases on device tree, is urgently needed. This patch series fixes this issue. It provides two, already widely discussed and already present in the kernel, drivers for reserved memory: first based on DMA-coherent allocator, second using Contiguous Memory Allocator. The first one nicely implements typical 'carved out' reserved memory way of allocating contiguous buffers in a kernel-style way. The memory is used exclusively by devices assigned to the given memory region. The second one allows to reuse reserved memory for movable kernel pages (like disk buffers, anonymous memory) and migrates it out when device to allocates contiguous memory buffer. Both driver provides memory buffers via standard dma-mapping API. The patches have been rebased on top of latest CMA and mm changes merged to akmp kernel tree. To define a 64MiB CMA region following node is needed: multimedia_reserved: multimedia_mem_region { compatible = "shared-dma-pool"; reusable; size = <0x4000000>; alignment = <0x400000>; }; Similarly, one can define 64MiB region with DMA coherent memory: multimedia_reserved: multimedia_mem_region { compatible = "shared-dma-pool"; no-map; size = <0x4000000>; alignment = <0x400000>; }; Then the defined region can be assigned to devices: scaler: scaler@12500000 { memory-region = <&multimedia_reserved>; /* ... */ }; codec: codec@12600000 { memory-region = <&multimedia_reserved>; /* ... */ }; Best regards Marek Szyprowski Samsung R&D Institute Poland Changes since v1: (http://www.spinics.net/lists/arm-kernel/msg343702.html) - fixed possible memory leak in case of reserved memory allocation failure (thanks to Joonsoo Kim) Changes since the version posted in '[PATCH v6 00/11] reserved-memory regions/CMA in devicetree, again' thread http://lists.linaro.org/pipermail/linaro-mm-sig/2014-February/003738.html: - rebased on top of '[PATCH v3 -next 0/9] CMA: generalize CMA reserved area management code' patch series on v3.16-rc3 - improved dma-coherent driver, now it correctly handles assigning more than one device to the given memory region Patch summary: Marek Szyprowski (4): drivers: of: add automated assignment of reserved regions to client devices drivers: of: initialize and assign reserved memory to newly created devices drivers: dma-coherent: add initialization from device tree drivers: dma-contiguous: add initialization from device tree drivers/base/dma-coherent.c | 137 ++++++++++++++++++++++++++++++++++------ drivers/base/dma-contiguous.c | 67 ++++++++++++++++++++ drivers/of/of_reserved_mem.c | 70 ++++++++++++++++++++ drivers/of/platform.c | 7 ++ include/linux/cma.h | 3 + include/linux/of_reserved_mem.h | 7 ++ mm/cma.c | 62 ++++++++++++++---- 7 files changed, 323 insertions(+), 30 deletions(-) -- 1.9.2

11 years, 1 month

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