Linaro-mm-sig

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10 participants
6373 discussions

How to manage cached dmabuf importer private data?

by Hiroshi Doyu

Hi, We have a problem about how to manage cached dmabuf importer private data, where to keep, how to reuse and how to clean up. We want to keep some data in dmabuf importer side until an buffer is free'ed actually since a buffer can be reused again later in that importer subsystem so that that cache data doesn't have to be regenerated. This can be considered as some kind of caching this data. The scenario is: (1) Exporter passes a dmabuf to Importer. (2) Importer attaches a dev to a dmabuf. (3) Importer generates some data for a buffer for its own use. (4) Importer finishes its use of a buffer. (5) Importer detaches a dev from a dmabuf. (6) Again, Exporter passes a dmabuf fd to the same Importer. (7) Again, Importer attaches a dev to a dmabuf. (8) Importer wants to use the previously cached data from (2) without regenerating. (9) Again, Importer detaches a dev from a dmabuf. (10) Exporter free's a buffer along with a cached data from (2)/(8). At first I considered to use attachmenet private data, but apparently a life time of the attachment isn't equal to one of a buffer. A buffer lives longer than an attachment. Also Neither private data from dmabuf nor from attachment are for /Importer/. They are for Exporter's use from the comment in the header file. /** * struct dma_buf - shared buffer object .... * @priv: exporter specific private data for this buffer object. */ /** * struct dma_buf_attachment - holds device-buffer attachment data ... * @priv: exporter specific attachment data. ... */ This leads to the following 2 questions: One question is how to clean up the cached data at (10) since there's no way for Importer to trigger clean up at that time. I am considering to embed an /notifier/ in dmabuf when it's called at dmabuf release. Importer could register any callback in that notifier. At least this requires a dmabuf to have an notifier to be called at release. Does this sound acceptable? Or can we do the same outside of dmabuf framework? If there's more appropriate way, please let me know since I'm not so familier with drm side yet. Another question is where to keep that cached data. Usually that data is only valid within Impoter subsystem. So Imoporter could keep the list of that data in it as a global list along with a dmabuf pointer. When a dmabuf is imported, Importer can look up a global list if it's already cached. This list needs to be kept till a buffer is free'ed. Those can be implemented in the dmabuf exporter backend but we want to allow multiple allocators/exporters to do the same, and I want to avoid having something related to importer in exporter side. Any comment would be really appreciated.

12 years, 2 months

[PATCH v5 00/11] reserved-memory regions/CMA in devicetree, again

by Marek Szyprowski

Hi all! Ok, I hope that this is the last update of the patches which add basic support for dynamic allocation of memory reserved regions defined in device tree. This time I've mainly sliced the main patch into several smaller pieces to make the changes easier to understand and fixes some minor coding style issues. The initial code for this feature were posted here [1], merged as commit 9d8eab7af79cb4ce2de5de39f82c455b1f796963 ("drivers: of: add initialization code for dma reserved memory") and later reverted by commit 1931ee143b0ab72924944bc06e363d837ba05063. For more information, see [2]. Finally a new bindings has been proposed [3] and Josh Cartwright a few days ago prepared some code which implements those bindings [4]. This finally pushed me again to find some time to finish this task and review the code. Josh agreed to give me the ownership of this series to continue preparing them for mainline inclusion. For more information please refer to the changlelog and links below. [1]: http://lkml.kernel.org/g/1377527959-5080-1-git-send-email-m.szyprowski@sams… [2]: http://lkml.kernel.org/g/1381476448-14548-1-git-send-email-m.szyprowski@sam… [3]: http://lkml.kernel.org/g/20131030134702.19B57C402A0@trevor.secretlab.ca [4]: http://thread.gmane.org/gmane.linux.documentation/19579 Changelog: v5: - sliced main patch into several smaller patches on Grant's request - fixed coding style issues pointed by Grant - use node->phandle value directly instead of parsing properties manually v4: https://lkml.org/lkml/2014/2/20/150 - dynamic allocations are processed after all static reservations has been done - moved code for handling static reservations to drivers/of/fdt.c - removed node matching by string comparison, now phandle values are used directly - moved code for DMA and CMA handling directly to drivers/base/dma-{coherent,contiguous}.c - added checks for proper #size-cells, #address-cells, ranges properties in /reserved-memory node - even more code cleanup - added init code for ARM64 and PowerPC v3: http://article.gmane.org/gmane.linux.documentation/20169/ - refactored memory reservation code, created common code to parse reg, size, align, alloc-ranges properties - added support for multiple tuples in 'reg' property - memory is reserved regardless of presence of the driver for its compatible - prepared arch specific hooks for memory reservation (defaults use memblock calls) - removed node matching by string during device initialization - CMA init code: added checks for required region alignment - more code cleanup here and there v2: http://thread.gmane.org/gmane.linux.documentation/19870/ - removed copying of the node name - split shared-dma-pool handling into separate files (one for CMA and one for dma_declare_coherent based implementations) for making the code easier to understand - added support for AMBA devices, changed prototypes to use struct decice instead of struct platform_device - renamed some functions to better match other names used in drivers/of/ - restructured the rest of the code a bit for better readability - added 'reusable' property to exmaple linux,cma node in documentation - exclusive dma (dma_coherent) is used for only handling 'shared-dma-pool' regions without 'reusable' property and CMA is used only for handling 'shared-dma-pool' regions with 'reusable' property. v1: http://thread.gmane.org/gmane.linux.documentation/19579 - initial version prepared by Josh Cartwright Summary: Grant Likely (1): of: document bindings for reserved-memory nodes Marek Szyprowski (10): drivers: of: add initialization code for static reserved memory drivers: of: add initialization code for dynamic reserved memory drivers: of: add support for custom reserved memory drivers 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 arm: add support for reserved memory defined by device tree arm64: add support for reserved memory defined by device tree powerpc: add support for reserved memory defined by device tree .../bindings/reserved-memory/reserved-memory.txt | 138 ++++++++++ arch/arm/Kconfig | 1 + arch/arm/mm/init.c | 2 + arch/arm64/Kconfig | 1 + arch/arm64/mm/init.c | 1 + arch/powerpc/Kconfig | 1 + arch/powerpc/kernel/prom.c | 3 + drivers/base/dma-coherent.c | 41 +++ drivers/base/dma-contiguous.c | 130 +++++++-- drivers/of/Kconfig | 6 + drivers/of/Makefile | 1 + drivers/of/fdt.c | 134 +++++++++ drivers/of/of_reserved_mem.c | 291 ++++++++++++++++++++ drivers/of/platform.c | 7 + include/asm-generic/vmlinux.lds.h | 11 + include/linux/of_fdt.h | 3 + include/linux/of_reserved_mem.h | 61 ++++ 17 files changed, 810 insertions(+), 22 deletions(-) create mode 100644 Documentation/devicetree/bindings/reserved-memory/reserved-memory.txt create mode 100644 drivers/of/of_reserved_mem.c create mode 100644 include/linux/of_reserved_mem.h -- 1.7.9.5

12 years, 2 months

Use of dma_buf_unmap_attachment in interrupt context?

by Hans Verkuil

A quick question: can dma_buf_unmap_attachment be called from interrupt context? It is the dmabuf equivalent to e.g. dma_sync_sg_for_cpu or dma_unmap_sg, and those can be called from interrupt context. I cannot see anything specific about this in the sources or dma-buf-sharing.txt. If it turns out that dma_buf_unmap_attachment can be called from atomic context, then that should be documented, I think. Regards, Hans

12 years, 2 months

CMA on AArch64

by Laura Abbott

Hi, I noticed there is currently no CMA support for AArch64. Is this already on someone's TODO list or is this still open? Thanks, Laura -- Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation

12 years, 2 months

[PATCH 0/2] arm: dma-mapping: add dynamic resize of IOVA bitmap

by Marek Szyprowski

Hello, This patchset is a continuation of the work started by Andreas Herrmann to add support for dynamically resized bitmaps for IOMMU based DMA-mapping implementation for ARM architecture. Some more discussion and rationale has been discussed in the following thread: http://www.spinics.net/lists/arm-kernel/msg303732.html The first patch adds support for on-demand extending IO address space bitmap. It is based on the original work by Andreas Herrmann, but I decided to drop arm_iommu_create_mapping() api change part. The second patch removes the 'order' hack, which was used to reduce the size of a bitmap. The first patch solved the problem of too large io address space bitmaps, so the 'order' hack is no longer needed. The parameters of the arm_iommu_create_mapping() function can be then simplified by dropping 'order' parameter without any functional change of the whole subsystem. This parameter was already a bit misunderstood, so the overall result is also a little improvement of the API. Best regards Marek Szyprowski, PhD Samsung R&D Institute Poland Andreas Herrmann (1): arm: dma-mapping: Add support to extend DMA IOMMU mappings Marek Szyprowski (1): arm: dma-mapping: remove order parameter from arm_iommu_create_mapping() arch/arm/include/asm/dma-iommu.h | 12 ++- arch/arm/mm/dma-mapping.c | 144 +++++++++++++++++++++++------ drivers/gpu/drm/exynos/exynos_drm_drv.h | 2 - drivers/gpu/drm/exynos/exynos_drm_iommu.c | 6 +- drivers/gpu/drm/exynos/exynos_drm_iommu.h | 1 - drivers/iommu/shmobile-iommu.c | 2 +- 6 files changed, 124 insertions(+), 43 deletions(-) -- 1.7.9.5

12 years, 2 months

[PATCH v4 0/7] reserved-memory regions/CMA in devicetree, again

by Marek Szyprowski

Hi all! This is another quick update of the patches which add basic support for dynamic allocation of memory reserved regions defined in device tree. This time I hope I've really managed to address all the issues reported by Grant Likely, see the change log for more details. As a bonus, I've added support for ARM64 and PowerPC, as those architectures had quite well defined place where early memory reservation can be done. The initial code for this feature were posted here [1], merged as commit 9d8eab7af79cb4ce2de5de39f82c455b1f796963 ("drivers: of: add initialization code for dma reserved memory") and later reverted by commit 1931ee143b0ab72924944bc06e363d837ba05063. For more information, see [2]. Finally a new bindings has been proposed [3] and Josh Cartwright a few days ago prepared some code which implements those bindings [4]. This finally pushed me again to find some time to finish this task and review the code. Josh agreed to give me the ownership of this series to continue preparing them for mainline inclusion. For more information please refer to the changlelog below. [1]: http://lkml.kernel.org/g/1377527959-5080-1-git-send-email-m.szyprowski@sams… [2]: http://lkml.kernel.org/g/1381476448-14548-1-git-send-email-m.szyprowski@sam… [3]: http://lkml.kernel.org/g/20131030134702.19B57C402A0@trevor.secretlab.ca [4]: http://thread.gmane.org/gmane.linux.documentation/19579 Changelog: v4: - dynamic allocations are processed after all static reservations has been done - moved code for handling static reservations to drivers/of/fdt.c - removed node matching by string comparison, now phandle values are used directly - moved code for DMA and CMA handling directly to drivers/base/dma-{coherent,contiguous}.c - added checks for proper #size-cells, #address-cells, ranges properties in /reserved-memory node - even more code cleanup - added init code for ARM64 and PowerPC v3: http://article.gmane.org/gmane.linux.documentation/20169/ - refactored memory reservation code, created common code to parse reg, size, align, alloc-ranges properties - added support for multiple tuples in 'reg' property - memory is reserved regardless of presence of the driver for its compatible - prepared arch specific hooks for memory reservation (defaults use memblock calls) - removed node matching by string during device initialization - CMA init code: added checks for required region alignment - more code cleanup here and there v2: http://thread.gmane.org/gmane.linux.documentation/19870/ - removed copying of the node name - split shared-dma-pool handling into separate files (one for CMA and one for dma_declare_coherent based implementations) for making the code easier to understand - added support for AMBA devices, changed prototypes to use struct decice instead of struct platform_device - renamed some functions to better match other names used in drivers/of/ - restructured the rest of the code a bit for better readability - added 'reusable' property to exmaple linux,cma node in documentation - exclusive dma (dma_coherent) is used for only handling 'shared-dma-pool' regions without 'reusable' property and CMA is used only for handling 'shared-dma-pool' regions with 'reusable' property. v1: http://thread.gmane.org/gmane.linux.documentation/19579 - initial version prepared by Josh Cartwright Summary: Grant Likely (1): of: document bindings for reserved-memory nodes Marek Szyprowski (6): drivers: of: add initialization code for reserved memory drivers: dma-coherent: add initialization from device tree drivers: dma-contiguous: add initialization from device tree arm: add support for reserved memory defined by device tree arm64: add support for reserved memory defined by device tree powerpc: add support for reserved memory defined by device tree .../bindings/reserved-memory/reserved-memory.txt | 138 +++++++++ arch/arm/Kconfig | 1 + arch/arm/mm/init.c | 3 + arch/arm64/Kconfig | 1 + arch/arm64/mm/init.c | 2 + arch/powerpc/Kconfig | 1 + arch/powerpc/kernel/prom.c | 3 + drivers/base/dma-coherent.c | 41 +++ drivers/base/dma-contiguous.c | 130 +++++++-- drivers/of/Kconfig | 6 + drivers/of/Makefile | 1 + drivers/of/fdt.c | 145 ++++++++++ drivers/of/of_reserved_mem.c | 296 ++++++++++++++++++++ drivers/of/platform.c | 7 + include/asm-generic/vmlinux.lds.h | 11 + include/linux/of_reserved_mem.h | 65 +++++ 16 files changed, 829 insertions(+), 22 deletions(-) create mode 100644 Documentation/devicetree/bindings/reserved-memory/reserved-memory.txt create mode 100644 drivers/of/of_reserved_mem.c create mode 100644 include/linux/of_reserved_mem.h -- 1.7.9.5

12 years, 2 months

[PATCH v3 0/6] reserved-memory regions/CMA in devicetree, again

by Marek Szyprowski

Hi all! This is yet another update of the second attempt to add basic support for dynamic allocation of memory reserved regions defined in device tree. This time I've tried to address all the issues reported by Grant Likely. The side-effect of it is a complete rewrite of memory reservation code, which results in added support for for multiple tuples in 'reg' property and complete support for 'size', 'align' and 'alloc-ranges' properties. The initial code for this feature were posted here [1], merged as commit 9d8eab7af79cb4ce2de5de39f82c455b1f796963 ("drivers: of: add initialization code for dma reserved memory") and later reverted by commit 1931ee143b0ab72924944bc06e363d837ba05063. For more information, see [2]. Finally a new bindings has been proposed [3] and Josh Cartwright a few days ago prepared some code which implements those bindings [4]. This finally pushed me again to find some time to finish this task and review the code. Josh agreed to give me the ownership of this series to continue preparing them for mainline inclusion. For more information please refer to the changlelog below. [1]: http://lkml.kernel.org/g/1377527959-5080-1-git-send-email-m.szyprowski@sams… [2]: http://lkml.kernel.org/g/1381476448-14548-1-git-send-email-m.szyprowski@sam… [3]: http://lkml.kernel.org/g/20131030134702.19B57C402A0@trevor.secretlab.ca [4]: http://thread.gmane.org/gmane.linux.documentation/19579 Changelog: v3: - refactored memory reservation code, created common code to parse reg, size, align, alloc-ranges properties - added support for multiple tuples in 'reg' property - memory is reserved regardless of presence of the driver for its compatible - prepared arch specific hooks for memory reservation (defaults use memblock calls) - removed node matching by string during device initialization - CMA init code: added checks for required region alignment - more code cleanup here and there v2: http://thread.gmane.org/gmane.linux.documentation/19870/ - removed copying of the node name - split shared-dma-pool handling into separate files (one for CMA and one for dma_declare_coherent based implementations) for making the code easier to understand - added support for AMBA devices, changed prototypes to use struct decice instead of struct platform_device - renamed some functions to better match other names used in drivers/of/ - restructured the rest of the code a bit for better readability - added 'reusable' property to exmaple linux,cma node in documentation - exclusive dma (dma_coherent) is used for only handling 'shared-dma-pool' regions without 'reusable' property and CMA is used only for handling 'shared-dma-pool' regions with 'reusable' property. v1: http://thread.gmane.org/gmane.linux.documentation/19579 - initial version prepared by Josh Cartwright Summary: Grant Likely (1): of: document bindings for reserved-memory nodes Josh Cartwright (2): drivers: of: implement reserved-memory handling for dma drivers: of: implement reserved-memory handling for cma Marek Szyprowski (3): base: dma-contiguous: add dma_contiguous_init_reserved_mem() function drivers: of: add initialization code for reserved memory ARM: init: add support for reserved memory defined by device tree .../bindings/reserved-memory/reserved-memory.txt | 138 +++++++ arch/arm/Kconfig | 1 + arch/arm/mm/init.c | 3 + drivers/base/dma-contiguous.c | 70 ++-- drivers/of/Kconfig | 19 + drivers/of/Makefile | 3 + drivers/of/fdt.c | 2 + drivers/of/of_reserved_mem.c | 390 ++++++++++++++++++++ drivers/of/of_reserved_mem_cma.c | 68 ++++ drivers/of/of_reserved_mem_dma.c | 65 ++++ drivers/of/platform.c | 7 + include/asm-generic/vmlinux.lds.h | 11 + include/linux/dma-contiguous.h | 7 + include/linux/of_reserved_mem.h | 65 ++++ 14 files changed, 827 insertions(+), 22 deletions(-) create mode 100644 Documentation/devicetree/bindings/reserved-memory/reserved-memory.txt create mode 100644 drivers/of/of_reserved_mem.c create mode 100644 drivers/of/of_reserved_mem_cma.c create mode 100644 drivers/of/of_reserved_mem_dma.c create mode 100644 include/linux/of_reserved_mem.h -- 1.7.9.5

12 years, 2 months

Re: [Linaro-mm-sig] [PATCH 2/6] seqno-fence: Hardware dma-buf implementation of fencing (v4)

by Rob Clark

On Mon, Feb 17, 2014 at 12:36 PM, Christian König <deathsimple(a)vodafone.de> wrote: > Am 17.02.2014 18:27, schrieb Rob Clark: > >> On Mon, Feb 17, 2014 at 11:56 AM, Christian König >> <deathsimple(a)vodafone.de> wrote: >>> >>> Am 17.02.2014 16:56, schrieb Maarten Lankhorst: >>> >>>> This type of fence can be used with hardware synchronization for simple >>>> hardware that can block execution until the condition >>>> (dma_buf[offset] - value) >= 0 has been met. >>> >>> >>> Can't we make that just "dma_buf[offset] != 0" instead? As far as I know >>> this way it would match the definition M$ uses in their WDDM >>> specification >>> and so make it much more likely that hardware supports it. >> >> well 'buf[offset] >= value' at least means the same slot can be used >> for multiple operations (with increasing values of 'value').. not sure >> if that is something people care about. >> >>> =value seems to be possible with adreno and radeon. I'm not really sure >>> about others (although I presume it as least supported for nv desktop >>> stuff). For hw that cannot do >=value, we can either have a different fence >>> implementation which uses the !=0 approach. Or change seqno-fence >>> implementation later if needed. But if someone has hw that can do !=0 but >>> not >=value, speak up now ;-) > > > Here! Radeon can only do >=value on the DMA and 3D engine, but not with UVD > or VCE. And for the 3D engine it means draining the pipe, which isn't really > a good idea. hmm, ok.. forgot you have a few extra rings compared to me. Is UVD re-ordering from decode-order to display-order for you in hw? If not, I guess you need sw intervention anyways when a frame is done for frame re-ordering, so maybe hw->hw sync doesn't really matter as much as compared to gpu/3d->display. For dma<->3d interactions, seems like you would care more about hw<->hw sync, but I guess you aren't likely to use GPU A to do a resolve blit for GPU B.. For 3D ring, I assume you probably want a CP_WAIT_FOR_IDLE before a CP_MEM_WRITE to update fence value in memory (for the one signalling the fence). But why would you need that before a CP_WAIT_REG_MEM (for the one waiting for the fence)? I don't exactly have documentation for adreno version of CP_WAIT_REG_{MEM,EQ,GTE}.. but PFP and ME appear to be same instruction set as r600, so I'm pretty sure they should have similar capabilities.. CP_WAIT_REG_MEM appears to be same but with 32bit gpu addresses vs 64b. BR, -R > Christian. > > >> >>> Apart from that I still don't like the idea of leaking a drivers IRQ >>> context >>> outside of the driver, but without a proper GPU scheduler there probably >>> isn't much alternative. >> >> I guess it will be not uncommon scenario for gpu device to just need >> to kick display device to write a few registers for a page flip.. >> probably best not to schedule a worker just for this (unless the >> signalled device otherwise needs to). I think it is better in this >> case to give the signalee some rope to hang themselves, and make it >> the responsibility of the callback to kick things off to a worker if >> needed. >> >> BR, >> -R >> >>> Christian. >>> >>>> A software fallback still has to be provided in case the fence is used >>>> with a device that doesn't support this mechanism. It is useful to >>>> expose >>>> this for graphics cards that have an op to support this. >>>> >>>> Some cards like i915 can export those, but don't have an option to wait, >>>> so they need the software fallback. >>>> >>>> I extended the original patch by Rob Clark. >>>> >>>> v1: Original >>>> v2: Renamed from bikeshed to seqno, moved into dma-fence.c since >>>> not much was left of the file. Lots of documentation added. >>>> v3: Use fence_ops instead of custom callbacks. Moved to own file >>>> to avoid circular dependency between dma-buf.h and fence.h >>>> v4: Add spinlock pointer to seqno_fence_init >>>> >>>> Signed-off-by: Maarten Lankhorst <maarten.lankhorst(a)canonical.com> >>>> --- >>>> Documentation/DocBook/device-drivers.tmpl | 1 >>>> drivers/base/fence.c | 50 +++++++++++++ >>>> include/linux/seqno-fence.h | 109 >>>> +++++++++++++++++++++++++++++ >>>> 3 files changed, 160 insertions(+) >>>> create mode 100644 include/linux/seqno-fence.h >>>> >>>> diff --git a/Documentation/DocBook/device-drivers.tmpl >>>> b/Documentation/DocBook/device-drivers.tmpl >>>> index 7a0c9ddb4818..8c85c20942c2 100644 >>>> --- a/Documentation/DocBook/device-drivers.tmpl >>>> +++ b/Documentation/DocBook/device-drivers.tmpl >>>> @@ -131,6 +131,7 @@ X!Edrivers/base/interface.c >>>> !Edrivers/base/dma-buf.c >>>> !Edrivers/base/fence.c >>>> !Iinclude/linux/fence.h >>>> +!Iinclude/linux/seqno-fence.h >>>> !Edrivers/base/reservation.c >>>> !Iinclude/linux/reservation.h >>>> !Edrivers/base/dma-coherent.c >>>> diff --git a/drivers/base/fence.c b/drivers/base/fence.c >>>> index 12df2bf62034..cd0937127a89 100644 >>>> --- a/drivers/base/fence.c >>>> +++ b/drivers/base/fence.c >>>> @@ -25,6 +25,7 @@ >>>> #include <linux/export.h> >>>> #include <linux/atomic.h> >>>> #include <linux/fence.h> >>>> +#include <linux/seqno-fence.h> >>>> #define CREATE_TRACE_POINTS >>>> #include <trace/events/fence.h> >>>> @@ -413,3 +414,52 @@ __fence_init(struct fence *fence, const struct >>>> fence_ops *ops, >>>> trace_fence_init(fence); >>>> } >>>> EXPORT_SYMBOL(__fence_init); >>>> + >>>> +static const char *seqno_fence_get_driver_name(struct fence *fence) { >>>> + struct seqno_fence *seqno_fence = to_seqno_fence(fence); >>>> + return seqno_fence->ops->get_driver_name(fence); >>>> +} >>>> + >>>> +static const char *seqno_fence_get_timeline_name(struct fence *fence) { >>>> + struct seqno_fence *seqno_fence = to_seqno_fence(fence); >>>> + return seqno_fence->ops->get_timeline_name(fence); >>>> +} >>>> + >>>> +static bool seqno_enable_signaling(struct fence *fence) >>>> +{ >>>> + struct seqno_fence *seqno_fence = to_seqno_fence(fence); >>>> + return seqno_fence->ops->enable_signaling(fence); >>>> +} >>>> + >>>> +static bool seqno_signaled(struct fence *fence) >>>> +{ >>>> + struct seqno_fence *seqno_fence = to_seqno_fence(fence); >>>> + return seqno_fence->ops->signaled && >>>> seqno_fence->ops->signaled(fence); >>>> +} >>>> + >>>> +static void seqno_release(struct fence *fence) >>>> +{ >>>> + struct seqno_fence *f = to_seqno_fence(fence); >>>> + >>>> + dma_buf_put(f->sync_buf); >>>> + if (f->ops->release) >>>> + f->ops->release(fence); >>>> + else >>>> + kfree(f); >>>> +} >>>> + >>>> +static long seqno_wait(struct fence *fence, bool intr, signed long >>>> timeout) >>>> +{ >>>> + struct seqno_fence *f = to_seqno_fence(fence); >>>> + return f->ops->wait(fence, intr, timeout); >>>> +} >>>> + >>>> +const struct fence_ops seqno_fence_ops = { >>>> + .get_driver_name = seqno_fence_get_driver_name, >>>> + .get_timeline_name = seqno_fence_get_timeline_name, >>>> + .enable_signaling = seqno_enable_signaling, >>>> + .signaled = seqno_signaled, >>>> + .wait = seqno_wait, >>>> + .release = seqno_release, >>>> +}; >>>> +EXPORT_SYMBOL(seqno_fence_ops); >>>> diff --git a/include/linux/seqno-fence.h b/include/linux/seqno-fence.h >>>> new file mode 100644 >>>> index 000000000000..952f7909128c >>>> --- /dev/null >>>> +++ b/include/linux/seqno-fence.h >>>> @@ -0,0 +1,109 @@ >>>> +/* >>>> + * seqno-fence, using a dma-buf to synchronize fencing >>>> + * >>>> + * Copyright (C) 2012 Texas Instruments >>>> + * Copyright (C) 2012 Canonical Ltd >>>> + * Authors: >>>> + * Rob Clark <robdclark(a)gmail.com> >>>> + * Maarten Lankhorst <maarten.lankhorst(a)canonical.com> >>>> + * >>>> + * This program is free software; you can redistribute it and/or modify >>>> it >>>> + * under the terms of the GNU General Public License version 2 as >>>> published by >>>> + * the Free Software Foundation. >>>> + * >>>> + * This program is distributed in the hope that it will be useful, but >>>> WITHOUT >>>> + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY >>>> or >>>> + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public >>>> License >>>> for >>>> + * more details. >>>> + * >>>> + * You should have received a copy of the GNU General Public License >>>> along with >>>> + * this program. If not, see <http://www.gnu.org/licenses/>. >>>> + */ >>>> + >>>> +#ifndef __LINUX_SEQNO_FENCE_H >>>> +#define __LINUX_SEQNO_FENCE_H >>>> + >>>> +#include <linux/fence.h> >>>> +#include <linux/dma-buf.h> >>>> + >>>> +struct seqno_fence { >>>> + struct fence base; >>>> + >>>> + const struct fence_ops *ops; >>>> + struct dma_buf *sync_buf; >>>> + uint32_t seqno_ofs; >>>> +}; >>>> + >>>> +extern const struct fence_ops seqno_fence_ops; >>>> + >>>> +/** >>>> + * to_seqno_fence - cast a fence to a seqno_fence >>>> + * @fence: fence to cast to a seqno_fence >>>> + * >>>> + * Returns NULL if the fence is not a seqno_fence, >>>> + * or the seqno_fence otherwise. >>>> + */ >>>> +static inline struct seqno_fence * >>>> +to_seqno_fence(struct fence *fence) >>>> +{ >>>> + if (fence->ops != &seqno_fence_ops) >>>> + return NULL; >>>> + return container_of(fence, struct seqno_fence, base); >>>> +} >>>> + >>>> +/** >>>> + * seqno_fence_init - initialize a seqno fence >>>> + * @fence: seqno_fence to initialize >>>> + * @lock: pointer to spinlock to use for fence >>>> + * @sync_buf: buffer containing the memory location to signal on >>>> + * @context: the execution context this fence is a part of >>>> + * @seqno_ofs: the offset within @sync_buf >>>> + * @seqno: the sequence # to signal on >>>> + * @ops: the fence_ops for operations on this seqno fence >>>> + * >>>> + * This function initializes a struct seqno_fence with passed >>>> parameters, >>>> + * and takes a reference on sync_buf which is released on fence >>>> destruction. >>>> + * >>>> + * A seqno_fence is a dma_fence which can complete in software when >>>> + * enable_signaling is called, but it also completes when >>>> + * (s32)((sync_buf)[seqno_ofs] - seqno) >= 0 is true >>>> + * >>>> + * The seqno_fence will take a refcount on the sync_buf until it's >>>> + * destroyed, but actual lifetime of sync_buf may be longer if one of >>>> the >>>> + * callers take a reference to it. >>>> + * >>>> + * Certain hardware have instructions to insert this type of wait >>>> condition >>>> + * in the command stream, so no intervention from software would be >>>> needed. >>>> + * This type of fence can be destroyed before completed, however a >>>> reference >>>> + * on the sync_buf dma-buf can be taken. It is encouraged to re-use the >>>> same >>>> + * dma-buf for sync_buf, since mapping or unmapping the sync_buf to the >>>> + * device's vm can be expensive. >>>> + * >>>> + * It is recommended for creators of seqno_fence to call fence_signal >>>> + * before destruction. This will prevent possible issues from >>>> wraparound >>>> at >>>> + * time of issue vs time of check, since users can check >>>> fence_is_signaled >>>> + * before submitting instructions for the hardware to wait on the >>>> fence. >>>> + * However, when ops.enable_signaling is not called, it doesn't have to >>>> be >>>> + * done as soon as possible, just before there's any real danger of >>>> seqno >>>> + * wraparound. >>>> + */ >>>> +static inline void >>>> +seqno_fence_init(struct seqno_fence *fence, spinlock_t *lock, >>>> + struct dma_buf *sync_buf, uint32_t context, uint32_t >>>> seqno_ofs, >>>> + uint32_t seqno, const struct fence_ops *ops) >>>> +{ >>>> + BUG_ON(!fence || !sync_buf || !ops); >>>> + BUG_ON(!ops->wait || !ops->enable_signaling || >>>> !ops->get_driver_name || !ops->get_timeline_name); >>>> + >>>> + /* >>>> + * ops is used in __fence_init for get_driver_name, so needs to >>>> be >>>> + * initialized first >>>> + */ >>>> + fence->ops = ops; >>>> + __fence_init(&fence->base, &seqno_fence_ops, lock, context, >>>> seqno); >>>> + get_dma_buf(sync_buf); >>>> + fence->sync_buf = sync_buf; >>>> + fence->seqno_ofs = seqno_ofs; >>>> +} >>>> + >>>> +#endif /* __LINUX_SEQNO_FENCE_H */ >>>> >>>> _______________________________________________ >>>> dri-devel mailing list >>>> dri-devel(a)lists.freedesktop.org >>>> http://lists.freedesktop.org/mailman/listinfo/dri-devel >>> >>> >>> _______________________________________________ >>> dri-devel mailing list >>> dri-devel(a)lists.freedesktop.org >>> http://lists.freedesktop.org/mailman/listinfo/dri-devel > >

12 years, 2 months

[PATCH v2 0/5] reserved-memory regions/CMA in devicetree, again

by Marek Szyprowski

Hi all! This is an updated version of the second attempt to add basic support for dynamic allocation of memory reserved regions defined in device tree. The initial code for this feature were posted here [1], merged as commit 9d8eab7af79cb4ce2de5de39f82c455b1f796963 ("drivers: of: add initialization code for dma reserved memory") and later reverted by commit 1931ee143b0ab72924944bc06e363d837ba05063. For more information, see [2]. Finally a new bindings has been proposed [3] and Josh Cartwright a few days ago prepared some code which implements those bindings [4]. This finally pushed me again to find some time to finish this task and review the code. Josh agreed to give me the ownership of this series to continue preparing them for mainline inclusion. For more information please refer to the changlelog below. [1]: http://lkml.kernel.org/g/1377527959-5080-1-git-send-email-m.szyprowski@sams… [2]: http://lkml.kernel.org/g/1381476448-14548-1-git-send-email-m.szyprowski@sam… [3]: http://lkml.kernel.org/g/20131030134702.19B57C402A0@trevor.secretlab.ca [4]: http://thread.gmane.org/gmane.linux.documentation/19579 Changelog: v2: - removed copying of the node name - split shared-dma-pool handling into separate files (one for CMA and one for dma_declare_coherent based implementations) for making the code easier to understand - added support for AMBA devices, changed prototypes to use struct decice instead of struct platform_device - renamed some functions to better match other names used in drivers/of/ - restructured the rest of the code a bit for better readability - added 'reusable' property to exmaple linux,cma node in documentation - exclusive dma (dma_coherent) is used for only handling 'shared-dma-pool' regions without 'reusable' property and CMA is used only for handling 'shared-dma-pool' regions with 'reusable' property. v1: http://thread.gmane.org/gmane.linux.documentation/19579 - initial version prepared by Josh Cartwright Summary: Grant Likely (1): of: document bindings for reserved-memory nodes Josh Cartwright (2): drivers: of: implement reserved-memory handling for dma drivers: of: implement reserved-memory handling for cma Marek Szyprowski (2): drivers: of: add initialization code for reserved memory ARM: init: add support for reserved memory defined by device tree .../bindings/reserved-memory/reserved-memory.txt | 138 ++++++++++++ arch/arm/mm/init.c | 3 + drivers/of/Kconfig | 20 ++ drivers/of/Makefile | 3 + drivers/of/of_reserved_mem.c | 219 ++++++++++++++++++++ drivers/of/of_reserved_mem_cma.c | 75 +++++++ drivers/of/of_reserved_mem_dma.c | 78 +++++++ drivers/of/platform.c | 7 + include/asm-generic/vmlinux.lds.h | 11 + include/linux/of_reserved_mem.h | 62 ++++++ 10 files changed, 616 insertions(+) create mode 100644 Documentation/devicetree/bindings/reserved-memory/reserved-memory.txt create mode 100644 drivers/of/of_reserved_mem.c create mode 100644 drivers/of/of_reserved_mem_cma.c create mode 100644 drivers/of/of_reserved_mem_dma.c create mode 100644 include/linux/of_reserved_mem.h -- 1.7.9.5

12 years, 2 months

[GIT PULL]: dma-buf updates for 3.14

by Sumit Semwal

Hi Linus, Here's another tiny pull request for dma-buf framework updates; just some debugfs output updates. (There's another patch related to dma-buf, but it'll get upstreamed via Greg-kh's pull request). Could you please pull? The following changes since commit 45f7fdc2ffb9d5af4dab593843e89da70d1259e3: Merge branch 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc (2014-02-11 22:28:47 -0800) are available in the git repository at: git://git.kernel.org/pub/scm/linux/kernel/git/sumits/dma-buf.git tags/dma-buf-for-3.14 for you to fetch changes up to c0b00a525c127d0055c1df6283300e17f601a1a1: dma-buf: update debugfs output (2014-02-13 10:08:52 +0530) ---------------------------------------------------------------- Small dma-buf pull request for 3.14 ---------------------------------------------------------------- Sumit Semwal (1): dma-buf: update debugfs output drivers/base/dma-buf.c | 25 ++++++++++++------------- include/linux/dma-buf.h | 2 +- 2 files changed, 13 insertions(+), 14 deletions(-)

12 years, 2 months

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