Linaro-mm-sig

linaro-mm-sig@lists.linaro.org

15 participants
3030 discussions

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, 1 month

[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

[PATCH v5 00/11] Add DRM for stih4xx platforms

by Benjamin Gaignard

This series of patches add the support of DRM/KMS drivers for STMicroelectronics chipsets stih416 and stih407. version 5: - Rework sti_drm_drv probes functions to support deferred probe. This allow hdmi to delayed framebuffer creation until I2C is available. - Add ops functsions in sti_layer structure to simpify GDP and VID code. - Add NOTES file to describe how the DRM concepts are mapped on hardware. patches could be found here: git://git.linaro.org/people/benjamin.gaignard/kernel.git on branch: drm_kms_for_next-v5 version 4: - Remove depency between TVout it subdevices HDMI and HDA - Rework and simplify VTG and VTAC code - Fix numbers of typo and indentation - Remove debug (will be push in separate patches) - Fix remarks done in previous patcheset patches could be found here: git://git.linaro.org/people/benjamin.gaignard/kernel.git on branch: drm_kms_for_next-v4 version 3: - Correctly split code between probe and bind funtions - Squash some commits - remove HQ-VDP device code to have a smaller patcheset, we will introduce it later. patches could be found here: git://git.linaro.org/people/benjamin.gaignard/kernel.git on branch: drm_kms_for_next-v3 version 2: - Use componentized device instead of register sub-devices in master driver probe function - Fix Makefile and Kconfig to only allow built-in compilation patches could be found here: git://git.linaro.org/people/benjamin.gaignard/kernel.git on branch: drm_kms_for_next-v2 version 1: - First path submission Hardware is split in two main blocks: Compositor and TVout. Each of them includes specific hardware IPs and the display timing are controlled by a specific Video Timing Generator hardware IP (VTG). Compositor is made of the follow hardware IPs: - GDP (Generic Display Pipeline) which is an entry point for graphic (RGB) buffers - VDP (Video Diplay Pipeline) which is an entry point for video (YUV) buffers - HQVDP (High Quality Video Display Processor) that supports scaling, deinterlacing and some miscellaneous image quality improvements. It fetches the Video decoded buffers from memory, processes them and pushes them to the Compositor through a HW dedicated bus. - Mixer is responsible of mixing all the entries depending of their respective z-order and layout TVout is divided in 3 parts: - HDMI to generate HDMI signals, depending of chipset version HDMI phy can change. - HDA to generate signals for HD analog TV - VIP to control/switch data path coming from Compositor On stih416 compositor and Tvout are on different dies so a Video Trafic Advance inter-die Communication mechanism (VTAC) is needed. +---------------------------------------------+ +----------------------------------------+ | +-------------------------------+ +----+ | | +----+ +--------------------------+ | | | | | | | | | | | +---------+ +----+ | | | | +----+ +------+ | | | | | | | | | VIP |---->|HDMI| | | | | |GPD +------------->| | | | | | | | | | | | +----+ | | | | +----+ |Mixer |--|-->| | | | | |---|->| switcher| | | | | | | | | | | | | | | | | +----+ | | | | | | | | | | | | | | | |---->|HDA | | | | | +------+ | |VTAC|========>|VTAC| | +---------+ +----+ | | | | | | | | | | | | | | | | Compositor | | | | | | | | TVout | | | +-------------------------------+ | | | | | | +--------------------------+ | | ^ | | | | | | ^ | | | | | | | | | | | | +--------------+ | | | | | | +-------------+ | | | VTG (master) |----->| | | | | |----->| VTG (slave) | | | +--------------+ +----+ | | +----+ +-------------+ | |Digital die | | Analog Die| +---------------------------------------------+ +----------------------------------------+ On stih407 Compositor and Tvout are on the same die +-----------------------------------------------------------------+ | +-------------------------------+ +--------------------------+ | | | | | +---------+ +----+ | | | | +----+ +------+ | | | VIP |---->|HDMI| | | | | |GPD +------------->| | | | | | +----+ | | | | +----+ |Mixer |--|--|->| switcher| | | | | +----+ +-----+ | | | | | | +----+ | | | | |VDP +-->+HQVDP+--->| | | | | |---->|HDA | | | | | +----+ +-----+ +------+ | | +---------+ +----+ | | | | | | | | | | Compositor | | TVout | | | +-------------------------------+ +--------------------------+ | | ^ ^ | | | | | | +--------------+ | | | VTG | | | +--------------+ | |Digital die | +-----------------------------------------------------------------+ In addition of the drivers for the IPs listed before a thin I2C driver (hdmiddc) is used by HDMI driver to retrieve EDID for monitor. To unify interfaces of GDP and VDP we create a "layer" interface called by compositor to control both GPD and VDP. Hardware have memory contraints (alignment, contiguous) so we use CMA drm helpers functions to allocate frame buffer. File naming convention is: - sti_* for IPs drivers - sti_drm_* for drm functions implementation. Benjamin Gaignard (11): drm: sti: add bindings for DRM driver drm: sti: add VTG driver drm: sti: add VTAC drivers drm: sti: add HDMI driver drm: sti: add HDA driver drm: sti: add TVOut driver drm: sti: add GDP layer drm: sti: add VID layer drm: sti: add Mixer drm: sti: add Compositor drm: sti: Add DRM driver itself .../devicetree/bindings/gpu/st,stih4xx.txt | 189 +++++ drivers/gpu/drm/Kconfig | 2 + drivers/gpu/drm/Makefile | 1 + drivers/gpu/drm/sti/Kconfig | 14 + drivers/gpu/drm/sti/Makefile | 17 + drivers/gpu/drm/sti/NOTES | 58 ++ drivers/gpu/drm/sti/sti_compositor.c | 264 +++++++ drivers/gpu/drm/sti/sti_compositor.h | 90 +++ drivers/gpu/drm/sti/sti_drm_crtc.c | 419 +++++++++++ drivers/gpu/drm/sti/sti_drm_crtc.h | 21 + drivers/gpu/drm/sti/sti_drm_drv.c | 244 +++++++ drivers/gpu/drm/sti/sti_drm_drv.h | 29 + drivers/gpu/drm/sti/sti_drm_plane.c | 192 +++++ drivers/gpu/drm/sti/sti_drm_plane.h | 17 + drivers/gpu/drm/sti/sti_gdp.c | 549 ++++++++++++++ drivers/gpu/drm/sti/sti_gdp.h | 16 + drivers/gpu/drm/sti/sti_hda.c | 790 ++++++++++++++++++++ drivers/gpu/drm/sti/sti_hdmi.c | 808 +++++++++++++++++++++ drivers/gpu/drm/sti/sti_hdmi.h | 88 +++ drivers/gpu/drm/sti/sti_hdmi_tx3g0c55phy.c | 336 +++++++++ drivers/gpu/drm/sti/sti_hdmi_tx3g0c55phy.h | 14 + drivers/gpu/drm/sti/sti_hdmi_tx3g4c28phy.c | 211 ++++++ drivers/gpu/drm/sti/sti_hdmi_tx3g4c28phy.h | 14 + drivers/gpu/drm/sti/sti_layer.c | 206 ++++++ drivers/gpu/drm/sti/sti_layer.h | 125 ++++ drivers/gpu/drm/sti/sti_mixer.c | 249 +++++++ drivers/gpu/drm/sti/sti_mixer.h | 54 ++ drivers/gpu/drm/sti/sti_tvout.c | 657 +++++++++++++++++ drivers/gpu/drm/sti/sti_vid.c | 138 ++++ drivers/gpu/drm/sti/sti_vid.h | 12 + drivers/gpu/drm/sti/sti_vtac.c | 211 ++++++ drivers/gpu/drm/sti/sti_vtg.c | 356 +++++++++ drivers/gpu/drm/sti/sti_vtg.h | 28 + 33 files changed, 6419 insertions(+) create mode 100644 Documentation/devicetree/bindings/gpu/st,stih4xx.txt create mode 100644 drivers/gpu/drm/sti/Kconfig create mode 100644 drivers/gpu/drm/sti/Makefile create mode 100644 drivers/gpu/drm/sti/NOTES create mode 100644 drivers/gpu/drm/sti/sti_compositor.c create mode 100644 drivers/gpu/drm/sti/sti_compositor.h create mode 100644 drivers/gpu/drm/sti/sti_drm_crtc.c create mode 100644 drivers/gpu/drm/sti/sti_drm_crtc.h create mode 100644 drivers/gpu/drm/sti/sti_drm_drv.c create mode 100644 drivers/gpu/drm/sti/sti_drm_drv.h create mode 100644 drivers/gpu/drm/sti/sti_drm_plane.c create mode 100644 drivers/gpu/drm/sti/sti_drm_plane.h create mode 100644 drivers/gpu/drm/sti/sti_gdp.c create mode 100644 drivers/gpu/drm/sti/sti_gdp.h create mode 100644 drivers/gpu/drm/sti/sti_hda.c create mode 100644 drivers/gpu/drm/sti/sti_hdmi.c create mode 100644 drivers/gpu/drm/sti/sti_hdmi.h create mode 100644 drivers/gpu/drm/sti/sti_hdmi_tx3g0c55phy.c create mode 100644 drivers/gpu/drm/sti/sti_hdmi_tx3g0c55phy.h create mode 100644 drivers/gpu/drm/sti/sti_hdmi_tx3g4c28phy.c create mode 100644 drivers/gpu/drm/sti/sti_hdmi_tx3g4c28phy.h create mode 100644 drivers/gpu/drm/sti/sti_layer.c create mode 100644 drivers/gpu/drm/sti/sti_layer.h create mode 100644 drivers/gpu/drm/sti/sti_mixer.c create mode 100644 drivers/gpu/drm/sti/sti_mixer.h create mode 100644 drivers/gpu/drm/sti/sti_tvout.c create mode 100644 drivers/gpu/drm/sti/sti_vid.c create mode 100644 drivers/gpu/drm/sti/sti_vid.h create mode 100644 drivers/gpu/drm/sti/sti_vtac.c create mode 100644 drivers/gpu/drm/sti/sti_vtg.c create mode 100644 drivers/gpu/drm/sti/sti_vtg.h -- 1.9.1

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 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. Thank you Sent from Samsung Mobile -------- Original message -------- From: PINTU KUMAR <pintu_agarwal(a)yahoo.com> Date: 09/07/2014 8:41 AM (GMT+09:00) To: linux-mm@kvack.org,linux-mm@kvack.org,linux-arm-kernel@lists.infradead.org,linaro-mm-sig@lists.linaro.org 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: [linux-3.10.17] Could not allocate memory from free CMA areas Hi, We are facing one problem on linux 3.10 when we try to use CMA as large as 56MB for 256MB RAM device. We found that after certain point of time (during boot), min watermark check is failing when "free_pages" and "free_cma_pages" are almost equal and falls below the min level. system details: ARM embedded device: RAM: 256MB Kernel version: 3.10.17 Fixed Reserved memory: ~40MB Available memory: 217MB CMA reserved 1 : 56MB ZRAM configured: 128MB or 64MB min_free_kbytes: 1625 (default) Memory controller group enabled (MEMCG) After boot-up the "free -tm" command shows free memory as: ~50MB CMA is used for all UI display purposes. CMA used during bootup is close to ~6MB. Thus most of the free memory is in the form of CMA free memory. ZRAM getting uses was around ~5MB. During boot-up itself we observe that the following conditions are met. if (free_pages - free_cma <= min + lowmem_reserve) { printk"[PINTU]: __zone_watermark_ok: failed !\n"); return false; } Here: free_pages was: 12940, free_cma was: 12380, min: 566, lowmem: 0 Thus is condition is met most of the time. And because of this watermark failure, Kswapd is waking up frequently. The /proc/pagetypeinfo reports that most of the higher order pages are from CMA regions. We also observed that ZRAM is trying to allocate memory from CMA region and failing. We also tried by decreasing the CMA region to 20MB. With this the watermark failure is not happening in boot time. But if we launch more than 3 apps {Browser, music-player etc}, again the watermark started failing. Also we tried decreasing the min_free_kbytes=256, and with this also watermark is passed. Our observation is that ZRAM/zsmalloc trying to allocate memory from CMA areas and failed. Please let us know if anybody have come across the same problem and how to resolve this issue. Thank You! Regards, Pintu

11 years, 1 month

[RFC PATCH] mm: cma: allow O_DIRECT I/O on CMA pages

by Marc Carino

It is desirable to perform "zero copy" operations on the numerous embedded systems that run the Linux kernel, to enable efficient performance on resource-constrained systems. Usually such embedded systems leverage mechanisms like CMA to carve-out regions of contiguous physical memory for use by bus-mastering peripherals. This patch adds some logic which determines if user-space is attempting to perform direct I/O mapping on CMA pages, and if so, ensures the mapping succeeds. This patch is a 1st attempt to allow O_DIRECT on the memory carved-out by CMA. Any suggestions or comments are appreciated! Signed-off-by: Marc Carino <marc.ceeeee(a)gmail.com> --- mm/gup.c | 65 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 65 insertions(+) diff --git a/mm/gup.c b/mm/gup.c index cc5a9e7..5fd1bfa 100644 --- a/mm/gup.c +++ b/mm/gup.c @@ -353,6 +353,61 @@ static int check_vma_flags(struct vm_area_struct *vma, unsigned long gup_flags) return 0; } +static int cma_get_page(struct mm_struct *mm, struct vm_area_struct *vma, + unsigned long start, struct page **page) +{ +#ifdef CONFIG_CMA + const unsigned long pg = start & PAGE_MASK; + unsigned long pfn; + int ret = -EFAULT; + pgd_t *pgd; + pud_t *pud; + pmd_t *pmd; + pte_t *pte; + struct page *tmp_page; + + pgd = pgd_offset(mm, pg); + BUG_ON(pgd_none(*pgd)); + pud = pud_offset(pgd, pg); + BUG_ON(pud_none(*pud)); + pmd = pmd_offset(pud, pg); + if (pmd_none(*pmd)) + return ret; + + pte = pte_offset_map(pmd, pg); + if (!pte) + return ret; + + if (pte_none(*pte)) + goto out; + + tmp_page = pte_page(*pte); + if (!tmp_page) + goto out; + + if (!page_count(tmp_page)) + goto out; + + if (page_mapped(tmp_page)) + goto out; + + if (get_pageblock_migratetype(tmp_page) != MIGRATE_CMA) + goto out; + + if (page) { + *page = tmp_page; + get_page(*page); + } + ret = 0; + +out: + pte_unmap(pte); + return ret; +#else + return 0; +#endif +} + /** * __get_user_pages() - pin user pages in memory * @tsk: task_struct of target task @@ -443,6 +498,16 @@ long __get_user_pages(struct task_struct *tsk, struct mm_struct *mm, goto next_page; } + if (!cma_get_page(mm, vma, start, + pages ? &pages[i] : NULL)) { + if (vmas) + vmas[i] = vma; + i++; + start += PAGE_SIZE; + nr_pages--; + continue; + } + if (!vma || check_vma_flags(vma, gup_flags)) return i ? : -EFAULT; if (is_vm_hugetlb_page(vma)) { -- 1.8.1.3

11 years, 2 months

Re: [Linaro-mm-sig] [PATCH 00/83] AMD HSA kernel driver

by Daniel Vetter

On Tue, Jul 15, 2014 at 7:53 PM, Bridgman, John <John.Bridgman(a)amd.com> wrote: [snip away the discussion about hsa device discover, I'm hijacking this thread just for the event/fence stuff here.] > ... There's an event mechanism still to come - mostly for communicating fences and shader interrupts back to userspace, but also used for "device change" notifications, so no polling of sysfs. That could would be interesting. On i915 my plan is to internally use the recently added struct fence from Maarten. For the external interface for userspace that wants explicit control over fences I'm leaning towards polishing the android syncpt stuff (currently in staging). But in any case I _really_ want to avoid that we end up with multiple different and incompatible explicit fencing interfaces on linux. Adding relevant people. -Daniel -- Daniel Vetter Software Engineer, Intel Corporation +41 (0) 79 365 57 48 - http://blog.ffwll.ch

11 years, 2 months

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

by Marek Szyprowski

Hello, On 2014-07-09 01:41, PINTU KUMAR wrote: > Hi, > > We are facing one problem on linux 3.10 when we try to use CMA as large as 56MB for 256MB RAM device. > We found that after certain point of time (during boot), min watermark check is failing when "free_pages" and "free_cma_pages" are almost equal and falls below the min level. > > system details: > ARM embedded device: RAM: 256MB > Kernel version: 3.10.17 > Fixed Reserved memory: ~40MB > Available memory: 217MB > CMA reserved 1 : 56MB > ZRAM configured: 128MB or 64MB > min_free_kbytes: 1625 (default) > Memory controller group enabled (MEMCG) > > > After boot-up the "free -tm" command shows free memory as: ~50MB > CMA is used for all UI display purposes. CMA used during bootup is close to ~6MB. > Thus most of the free memory is in the form of CMA free memory. > ZRAM getting uses was around ~5MB. > > > During boot-up itself we observe that the following conditions are met. > > > if (free_pages - free_cma <= min + lowmem_reserve) { > printk"[PINTU]: __zone_watermark_ok: failed !\n"); > > return false; > } > Here: free_pages was: 12940, free_cma was: 12380, min: 566, lowmem: 0 > > > Thus is condition is met most of the time. > And because of this watermark failure, Kswapd is waking up frequently. > The /proc/pagetypeinfo reports that most of the higher order pages are from CMA regions. > > > We also observed that ZRAM is trying to allocate memory from CMA region and failing. > > We also tried by decreasing the CMA region to 20MB. With this the watermark failure is not happening in boot time. But if we launch more than 3 apps {Browser, music-player etc}, again the watermark started failing. > > Also we tried decreasing the min_free_kbytes=256, and with this also watermark is passed. > > Our observation is that ZRAM/zsmalloc trying to allocate memory from CMA areas and failed. > > > Please let us know if anybody have come across the same problem and how to resolve this issue. Frankly I really have no idea what is going on. ZRAM/zsmalloc should not try to alloc memory from CMA. I don't have access you the mentioned source code. What flags are passed to alloc_pages() in zram/zsmalloc? It should get pages from non-movable pool. Best regards -- Marek Szyprowski, PhD Samsung R&D Institute Poland

11 years, 2 months

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