- linaro-kernel - lists.linaro.org

by Mounir Bsaibes

I have created the UDS-session blueprints (blueprints to schedule the UDS sessions) as discussed in the meeting this morning. Take a look at the sessions specially the ownership and make sure you agree, you will have to run the session at UDS if you are the assignee (owner). As it turned out, each major Technical Requirement will have one session, with the exception of k1 where k1.1 (fix arm/linus interface) will have 5 daily sessions. So, most of the sessions cover multiple topics, you may need have to co-ordinate with others to run your session. https://wiki.linaro.org/WorkingGroups/Kernel/Cycle11.11SessionsSetup Paul, you need to approve all these blueprints in order to start scheduling them. Grant, You have registered sessions for boot architecture and DT, please send me the blueprints links so I can add them to this table. Regards, Mounir

14 years, 10 months

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linaro-android track

by Zach Pfeffer

All, I apologize for the broad distribution. Alexander and I have been getting the Android track going. We have the following topics. Most of these have subscribers. Would everyone mind taking a look through this list and subscribing or suggesting people who should be involved? I'll be getting more details into each of these this week. Hosting and Distribution of Linaro Builds https://blueprints.launchpad.net/linaro-android/+spec/linaro-android-o-buil… This topic will focus on building and distributing Linaro Android builds. Topics will include: binary and source distribution, source and binary overlays (proprietary components and blobs from TI, Samsung, etc), license click-through, build and distribution location or method (host images and/or support on-demand image builds) and release tagging and naming. Subscribe: https://blueprints.launchpad.net/linaro-android/+spec/linaro-android-o-buil… Android Code Review https://blueprints.launchpad.net/linaro-android/+spec/linaro-android-o-code… This discussion will focus on Android code review. Topics will include Gerrit, continuous integration, maintainers, reviewers and validation. We'll focus on integrating the Android development model with Linaro. Subscribe: https://blueprints.launchpad.net/linaro-android/+spec/linaro-android-o-code… Android Continuous Integration and Building https://blueprints.launchpad.net/linaro-android/+spec/linaro-android-o-cont… This discussion will focus on Linaro Android continuous integration and builds. Topics include: infrastructure and validation requirements, test subsets for merges and unit testing. Subscribe: https://blueprints.launchpad.net/linaro-android/+spec/linaro-android-o-cont… Android LEB Validation and Test Suite https://blueprints.launchpad.net/linaro-android/+spec/linaro-android-o-vali… This discussion will focus on LEB validation and test suites. Topics will include: Monkey, CTS, Monkeyrunner, unit-tests, continuous integration merge tests. Subscribe: https://blueprints.launchpad.net/linaro-android/+spec/linaro-android-o-vali… 2011 ELC Follow Up and Planning https://blueprints.launchpad.net/linaro-android/+spec/linaro-android-o-2011… Linaro had a good meeting at the 2011 Embedded Linux Conference. Many things were discussed. This session will talk about next steps and future planning. Subscribe: https://blueprints.launchpad.net/linaro-android/+spec/linaro-android-o-2011… Android Hardfloat Experiment https://blueprints.launchpad.net/linaro-android/+spec/linaro-android-o-hard… This session will discuss strategies to find hot-spots that could benefit from hardfloat without breaking overall binary compatibility with market apps. Subscribe: https://blueprints.launchpad.net/linaro-android/+spec/linaro-android-o-hard… Android LEB Documentation https://blueprints.launchpad.net/linaro-android/+spec/linaro-android-o-leb-… This session will focus on discussing what documentation we need for LEB use and bundled with releases. Subscribe: https://blueprints.launchpad.net/linaro-android/+spec/linaro-android-o-leb-… Linaro Android Toolchain Distribution https://blueprints.launchpad.net/linaro-android/+spec/linaro-android-o-tool… This session will discuss how to distribute the various components of the Linaro toolchain. We'll discuss NDK and platform distribution, support on Ubuntu, Fedora and Mac, what components do we need to publish and benchmarking toolchain improvements. Subscribe: https://blueprints.launchpad.net/linaro-android/+spec/linaro-android-o-tool… LEB Board Review and Deliverable Requirements https://blueprints.launchpad.net/linaro-android/+spec/linaro-android-o-leb-… This discussion will talk about defining new member deliverable for Android LEBs, reviewing what's been delivered and assessing if we can raise the bar, discuss other low-cost high-volume board that currently exist or are on the way (Nexus One, Nexus S, Snowball), talk about LEB candidates, discuss cost ceilings (is the Elba board too expensive, for instance). Subscribe: https://blueprints.launchpad.net/linaro-android/+spec/linaro-android-o-leb-… Open Source Development for Non-Application Cores https://blueprints.launchpad.net/linaro-android/+spec/linaro-android-o-non-… This session will explore how to open up development for the various DSP and video cores that exist on many SoCs that are running Android to allow open source development of multimedia acceleration. Subscribe: https://blueprints.launchpad.net/linaro-android/+spec/linaro-android-o-non-… Upstream Android Build https://blueprints.launchpad.net/linaro-android/+spec/linaro-android-o-upst… This topic will discuss which changes we can upstream. Subscribe: https://blueprints.launchpad.net/linaro-android/+spec/linaro-android-o-upst… ADB Shell Improvements https://blueprints.launchpad.net/linaro-android/+spec/linaro-android-o-adb-… The adb shell lacks many features we take for granted. There is a need for a little more functionality, this session will discuss this. Subscribe: https://blueprints.launchpad.net/linaro-android/+spec/linaro-android-o-adb-… Android Beyond Phones and Advanced Topics https://blueprints.launchpad.net/linaro-android/+spec/linaro-android-o-beyo… This session will discuss the future of Android. It'll be a brainstorming session to talk about topics like: dual lib (bionic/glibc) support in Android, bringing apt-get into Android, Android as a general computing platform, expanded enterprise networking, expanded packages, traditional Linux application support, security certification and headless Android. Subscribe: https://blueprints.launchpad.net/linaro-android/+spec/linaro-android-o-beyo… JTAG for the World https://blueprints.launchpad.net/linaro-android/+spec/linaro-android-o-jtag This session will talk about improving tools for Ubuntu hosted JTAG tools, open JTAG script development and available JTAG platforms. Subscribe: https://blueprints.launchpad.net/linaro-android/+spec/linaro-android-o-jtag… -Zach

14 years, 10 months

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[ACTIVITY] (Shawn Guo) 2011-04-25 - 2011-04-29

by Shawn Guo

== Device Tree == * Sent a couple of u-boot patch to remove useless CONFIG_SYS_BOOTMAPSZ and redefined CONFIG_OF_LIBFDT for mx51/53 * Tested zImage fix patch set with append-dtb patch * It seems that RMK opposes to putting dts file in kernel tree == Non-blocking MMC testing == * Some more discussion with Per Porlin on mxs-mmc driver regarding to non-blocking support. Need to do more testing to understand if the ~4% performance improvement is expected on mxs-mmc. == LTP Blueprint == * Created the initial blueprint linaro-kernel-o-ras-fix-ltp * Tried ltp-full-20110228 and ltp-kernel-test package shipped with Natty (ltp-base-20091231), and saw very different test set and results. * Got contacted with Paul Larson who was ever the maintainer of LTP and now leading the Validation team and using LTP to validating Linaro images. He may give valuable inputs to the requirements of this Blueprint. == Plan == * Will work on v2 of sdhci-pltfm&of-consolidation * Keep drafting blueprint linaro-kernel-o-ras-fix-ltp -- Regards, Shawn

14 years, 10 months

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[ACTIVITY] (Paul E. McKenney) 2011-04-18 - 2011-04-29

by Paul E. McKenney

== Paul E. McKenney <paulmck> == === Highlights == * Sent Sedat Dilek yet more sets of diagnostics. This turned out to be a bug in the timers system, which Thomas Gleixner fixed. * Interviewed another candidate for Kernel WG, also +1. * Pre-Budapest definition/scheduling work. * Presented on SMP to the Android System Developers Forum. * Submitted RCU priority boosting to LKML, got good initial feedback. On track for the 2.6.40 merge window.

14 years, 10 months

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[ACTIVITY] (Per Forlin) 2011-04-25 - 2011-04-29

by Per Forlin

== Per Forlin <perfor> == === Highlights === * Preparing drafts for 11.11 blueprints * K7.3 Non-Blocking Request in MMC * K7.4 eMMC Background Maintenance * K7.6 SDIO Single Function Support * K7.10 DMA Engine on ARM * Started to investigate io-scheduling but ended up studying read ahead instead. It may turn out that "K7.2 Optimize I/O Scheduling for Flash" is not the right thing to do for flash performance. === Plans === * Prepare blueprints for LDS

14 years, 10 months

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[ACTIVITY] (John Stultz) April 25th-29th

by john stultz

== John Stultz <jstultz_vm> == === Highlights === * Posix Alarm Timers were pulled into -tip for 2.6.40! * However, some config related build issues were discovered, but I've sent a proposed fix to handle it. * Arve from Google commented on one of the Alarm Timer patches, suggesting a way to avoid error accumulation each suspend/resume cycle. * Reviewed Andy Green's slides for his talk and provided feedback. * Submitted the virtual battery driver, which is an out of tree patch in the Linaro+Android kernel tree, for review on lkml. After feedback from maintainer, I worked to merge the same functionality into the test_power driver and submitted that for inclusion. * Worked on Android Kernel Blueprints/Specs * Got some complaints on an old patch of mine that changed some of the task->comm locking rules, so submitted a rough draft patch on how to address the issue. Currently in discussion there. * Submitted Linux Plumbers conf BoF on Kconfig fragment work queued for 11.11 cycle === Plans === * Handle any last minute alarmtimer changes for -tip. * Try to adapt Arve's RTC suggestions into the tree. * Take another shot at the task->comm issue. * Continue working on the trivial tree to send out cpufreq and cgroup branches. * Follow up on the trivial tree patches sent out this week. * Try to get time to look at ADB support for Android kernels === Issues === * I've got Jury Duty on Weds, so will be out for most of the day.

14 years, 10 months

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mmc blkqueue is empty even if there are pending reads in do_generic_file_read()

by Per Forlin

Hi, I am working on minimizing the latency between two block requests in the mmc framework. The approach is simple. If there are more than one request in the block queue the 2nd request will be prepared while the 1st request is being transfered. When the 1 st request is completed the 2nd request will start with minimal latency cost. For writes this work fine: root@(none):/ dd of=/dev/mmcblk0p2 if=/dev/zero bs=4k count=2560 2560+0 records in 2560+0 records out root@(none):/ dmesg [mmc_queue_thread] req d97a2ac8 blocks 1024 [mmc_queue_thread] req d97a2ba0 blocks 1024 [mmc_queue_thread] req d97a2c78 blocks 1024 [mmc_queue_thread] req d97a2d50 blocks 1024 [mmc_queue_thread] req d97a2e28 blocks 1024 [mmc_queue_thread] req d97a2f00 blocks 1024 [mmc_queue_thread] req d954c9b0 blocks 1024 [mmc_queue_thread] req d954c800 blocks 1024 [mmc_queue_thread] req d954c728 blocks 1024 [mmc_queue_thread] req d954c650 blocks 1024 [mmc_queue_thread] req d954c578 blocks 1024 [mmc_queue_thread] req d954c4a0 blocks 1024 [mmc_queue_thread] req d954c8d8 blocks 1024 [mmc_queue_thread] req d954c3c8 blocks 1024 [mmc_queue_thread] req d954c2f0 blocks 1024 [mmc_queue_thread] req d954c218 blocks 1024 [mmc_queue_thread] req d954c140 blocks 1024 [mmc_queue_thread] req d954c068 blocks 1024 [mmc_queue_thread] req d954cde8 blocks 1024 [mmc_queue_thread] req d954cec0 blocks 1024 mmc block queue is never empty. All the mmc request preparations can run in parallel with an ongoing transfer. [mmc_queue_thread] req (null) blocks 0 [mmc_queue_thread] req (null) blocks 0 "req (null)" indicates there are no requests pending in the mmc block queue. This is expected since there are no more requests to process. For reads on the other hand it look like this root@(none):/ dd if=/dev/mmcblk0 of=/dev/null bs=4k count=256 256+0 records in 256+0 records out root@(none):/ dmesg [mmc_queue_thread] req d954cec0 blocks 32 [mmc_queue_thread] req (null) blocks 0 [mmc_queue_thread] req (null) blocks 0 [mmc_queue_thread] req d954cec0 blocks 64 [mmc_queue_thread] req (null) blocks 0 [mmc_queue_thread] req d954cde8 blocks 128 [mmc_queue_thread] req (null) blocks 0 [mmc_queue_thread] req d954cec0 blocks 256 [mmc_queue_thread] req (null) blocks 0 [mmc_queue_thread] req d954cde8 blocks 256 [mmc_queue_thread] req (null) blocks 0 [mmc_queue_thread] req d954cec0 blocks 256 [mmc_queue_thread] req (null) blocks 0 [mmc_queue_thread] req d954cde8 blocks 256 [mmc_queue_thread] req (null) blocks 0 [mmc_queue_thread] req d954cec0 blocks 256 [mmc_queue_thread] req (null) blocks 0 [mmc_queue_thread] req d954cde8 blocks 256 [mmc_queue_thread] req (null) blocks 0 [mmc_queue_thread] req d954cec0 blocks 256 [mmc_queue_thread] req (null) blocks 0 [mmc_queue_thread] req d954cde8 blocks 256 [mmc_queue_thread] req (null) blocks 0 [mmc_queue_thread] req d954cec0 blocks 256 [mmc_queue_thread] req (null) blocks 0 [mmc_queue_thread] req (null) blocks 0 There are never more than one read request in the mmc block queue. All the mmc request preparations will be serialized and the cost for this is roughly 10% lower bandwidth (verified on ARM platforms ux500 and Pandaboard). > page_not_up_to_date: > /* Get exclusive access to the page ... */ > error = lock_page_killable(page); I looked at the code in do_generic_file_read(). lock_page_killable waits until the current read ahead is completed. Is it possible to configure the read ahead to push multiple read request to the block device queue? Thanks, Per

14 years, 10 months

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Problem with SMP IRQ affinity

by Mounir Bsaibes

Looking for volunteer to handle the following bug: https://bugs.launchpad.net/linux-linaro/+bug/762026 Nico, has already pointed out what needs to be done. Thanks, Mounir

14 years, 10 months

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[PATCH 0/6] ARM device tree support improvements

by Grant Likely

Hi Jerry & Wolfgang, The following series fixes a bug in the device tree code and eliminates the CONFIG_OF_LIBFDT dependency on CONFIG_SYS_BOOTMAPSZ. It also adds parsing of the reserved mem regions so that U-Boot doesn't decide to use a regions set aside for another purpose. Finally, the last patch adds CONFIG_OF_LIBFDT to a bunch of boards. I'm not expecting the last patch to be picked up in mainline (yet), but it will be picked up into the Linaro tree for the 11.05 release. John, this same series applies cleanly on the linaro-stable u-boot tree. Can you pick them up please? Or would you prefer me to send you a pull request? g. --- Grant Likely (6): Stop passing around bootmem_base value. Default to bootm_size() when CONFIG_SYS_BOOTMAPSZ is not defined Remove device tree booting dependency on CONFIG_SYS_BOOTMAPSZ Fix off-by-one error in passing initrd end address via device tree Respect memreserve regions specified in the device tree Add CONFIG_OF_LIBFDT to more boards. README | 16 ++++++++- arch/arm/lib/bootm.c | 5 ++- arch/m68k/lib/bootm.c | 7 +--- arch/powerpc/lib/bootm.c | 19 +++++----- common/cmd_bootm.c | 7 ++-- common/fdt_support.c | 2 + common/image.c | 72 +++++++++++++++++++++++++++++---------- include/configs/ca9x4_ct_vxp.h | 2 + include/configs/devkit8000.h | 2 + include/configs/efikamx.h | 2 + include/configs/igep0020.h | 2 + include/configs/igep0030.h | 2 + include/configs/mx51evk.h | 2 + include/configs/mx53evk.h | 2 + include/configs/omap3_beagle.h | 7 ---- include/configs/omap3_overo.h | 2 + include/configs/omap3_pandora.h | 2 + include/configs/omap3_sdp3430.h | 2 + include/configs/omap3_zoom1.h | 2 + include/configs/omap3_zoom2.h | 2 + include/configs/omap4_panda.h | 2 + include/configs/omap4_sdp4430.h | 2 + include/configs/tegra2-common.h | 1 + include/image.h | 10 +++-- 24 files changed, 122 insertions(+), 52 deletions(-) -- Signature

14 years, 10 months

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[PATCH] mmc: mxs-mmc: add support for pre_req and post_req

by Shawn Guo

pre_req() runs dma_map_sg() post_req() runs dma_unmap_sg. If not calling pre_req() before mxs_mmc_request(), request() will prepare the cache just like it did it before. It is optional to use pre_req() and post_req(). Signed-off-by: Shawn Guo <shawn.guo(a)linaro.org> --- drivers/mmc/host/mxs-mmc.c | 75 ++++++++++++++++++++++++++++++++++++++++++-- 1 files changed, 72 insertions(+), 3 deletions(-) diff --git a/drivers/mmc/host/mxs-mmc.c b/drivers/mmc/host/mxs-mmc.c index 99d39a6..63c2ae2 100644 --- a/drivers/mmc/host/mxs-mmc.c +++ b/drivers/mmc/host/mxs-mmc.c @@ -137,6 +137,10 @@ #define SSP_PIO_NUM 3 +struct mxs_mmc_next { + s32 cookie; +}; + struct mxs_mmc_host { struct mmc_host *mmc; struct mmc_request *mrq; @@ -154,6 +158,7 @@ struct mxs_mmc_host { struct mxs_dma_data dma_data; unsigned int dma_dir; u32 ssp_pio_words[SSP_PIO_NUM]; + struct mxs_mmc_next next_data; unsigned int version; unsigned char bus_width; @@ -302,6 +307,31 @@ static irqreturn_t mxs_mmc_irq_handler(int irq, void *dev_id) return IRQ_HANDLED; } +static int mxs_mmc_prep_dma_data(struct mxs_mmc_host *host, + struct mmc_data *data, + struct mxs_mmc_next *next) +{ + if (!next && data->host_cookie && + data->host_cookie != host->next_data.cookie) { + printk(KERN_WARNING "[%s] invalid cookie: data->host_cookie %d" + " host->next_data.cookie %d\n", + __func__, data->host_cookie, host->next_data.cookie); + data->host_cookie = 0; + } + + /* Check if next job is already prepared */ + if (next || (!next && data->host_cookie != host->next_data.cookie)) + if (dma_map_sg(mmc_dev(host->mmc), data->sg, data->sg_len, + (data->flags & MMC_DATA_WRITE) ? + DMA_TO_DEVICE : DMA_FROM_DEVICE) == 0) + return -EINVAL; + + if (next) + data->host_cookie = ++next->cookie < 0 ? 1 : next->cookie; + + return 0; +} + static struct dma_async_tx_descriptor *mxs_mmc_prep_dma( struct mxs_mmc_host *host, unsigned int append) { @@ -312,8 +342,8 @@ static struct dma_async_tx_descriptor *mxs_mmc_prep_dma( if (data) { /* data */ - dma_map_sg(mmc_dev(host->mmc), data->sg, - data->sg_len, host->dma_dir); + if (mxs_mmc_prep_dma_data(host, data, NULL)) + return NULL; sgl = data->sg; sg_len = data->sg_len; } else { @@ -328,9 +358,11 @@ static struct dma_async_tx_descriptor *mxs_mmc_prep_dma( desc->callback = mxs_mmc_dma_irq_callback; desc->callback_param = host; } else { - if (data) + if (data) { dma_unmap_sg(mmc_dev(host->mmc), data->sg, data->sg_len, host->dma_dir); + data->host_cookie = 0; + } } return desc; @@ -553,6 +585,40 @@ static void mxs_mmc_start_cmd(struct mxs_mmc_host *host, } } +static void mxs_mmc_pre_req(struct mmc_host *mmc, struct mmc_request *mrq, + bool is_first_req) +{ + struct mxs_mmc_host *host = mmc_priv(mmc); + struct mmc_data *data = mrq->data; + + if (!data) + return; + + if (data->host_cookie) { + data->host_cookie = 0; + return; + } + + if (mxs_mmc_prep_dma_data(host, data, &host->next_data)) + data->host_cookie = 0; +} + +static void mxs_mmc_post_req(struct mmc_host *mmc, struct mmc_request *mrq, + int err) +{ + struct mxs_mmc_host *host = mmc_priv(mmc); + struct mmc_data *data = mrq->data; + + if (!data) + return; + + if (data->host_cookie) { + dma_unmap_sg(mmc_dev(host->mmc), data->sg, + data->sg_len, host->dma_dir); + data->host_cookie = 0; + } +} + static void mxs_mmc_request(struct mmc_host *mmc, struct mmc_request *mrq) { struct mxs_mmc_host *host = mmc_priv(mmc); @@ -644,6 +710,8 @@ static void mxs_mmc_enable_sdio_irq(struct mmc_host *mmc, int enable) } static const struct mmc_host_ops mxs_mmc_ops = { + .pre_req = mxs_mmc_pre_req, + .post_req = mxs_mmc_post_req, .request = mxs_mmc_request, .get_ro = mxs_mmc_get_ro, .get_cd = mxs_mmc_get_cd, @@ -708,6 +776,7 @@ static int mxs_mmc_probe(struct platform_device *pdev) host->dma_res = dmares; host->irq = irq_err; host->sdio_irq_en = 0; + host->next_data.cookie = 1; host->clk = clk_get(&pdev->dev, NULL); if (IS_ERR(host->clk)) { -- 1.7.4.1

14 years, 10 months

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[PATCH] mmc: sdhci: add support for pre_req and post_req

by Shawn Guo

pre_req() runs dma_map_sg() post_req() runs dma_unmap_sg. If not calling pre_req() before sdhci_request(), request() will prepare the cache just like it did it before. It is optional to use pre_req() and post_req(). Signed-off-by: Shawn Guo <shawn.guo(a)linaro.org> --- I worked out the patch by referring to Per's patch below. omap_hsmmc: add support for pre_req and post_req It adds pre_req and post_req support for sdhci based host drivers to work with Per's non-blocking optimization. But I only have imx esdhc based hardware to test. Unfortunately, I can not measure the performance gain using mmc_test, because the current esdhc driver on mainline fails on the test. So I just did a quick test using 'dd', but sadly, I did not see noticeable performance gain here. The followings are possible reasons I can think of right away. * The patch did not add pre_req and post_req correctly. Please help review to catch the mistakes if any. * The imx esdhc driver uses SDHCI_SDMA (max_segs is 1) than SDHCI_ADAM (max_segs is 128), due to the broken ADMA support on imx esdhc. So can people holding other sdhci based hardware give a try on the patch? Hopefully, I can find some time to have a close look at the mmc_test failure and the broken ADMA with imx esdhc. Regards, Shawn drivers/mmc/host/sdhci.c | 95 ++++++++++++++++++++++++++++++++++++++------ include/linux/mmc/sdhci.h | 7 +++ 2 files changed, 89 insertions(+), 13 deletions(-) diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index 9e15f41..becce9a 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -408,6 +408,44 @@ static void sdhci_set_adma_desc(u8 *desc, u32 addr, int len, unsigned cmd) dataddr[0] = cpu_to_le32(addr); } +static int sdhci_pre_dma_transfer(struct sdhci_host *host, + struct mmc_data *data, + struct sdhci_next *next) +{ + int sg_count; + + if (!next && data->host_cookie && + data->host_cookie != host->next_data.cookie) { + printk(KERN_WARNING "[%s] invalid cookie: data->host_cookie %d" + " host->next_data.cookie %d\n", + __func__, data->host_cookie, host->next_data.cookie); + data->host_cookie = 0; + } + + /* Check if next job is already prepared */ + if (next || + (!next && data->host_cookie != host->next_data.cookie)) { + sg_count = dma_map_sg(mmc_dev(host->mmc), data->sg, + data->sg_len, + (data->flags & MMC_DATA_WRITE) ? + DMA_TO_DEVICE : DMA_FROM_DEVICE); + } else { + sg_count = host->next_data.sg_count; + host->next_data.sg_count = 0; + } + + if (sg_count == 0) + return -EINVAL; + + if (next) { + next->sg_count = sg_count; + data->host_cookie = ++next->cookie < 0 ? 1 : next->cookie; + } else + host->sg_count = sg_count; + + return sg_count; +} + static int sdhci_adma_table_pre(struct sdhci_host *host, struct mmc_data *data) { @@ -445,9 +483,8 @@ static int sdhci_adma_table_pre(struct sdhci_host *host, goto fail; BUG_ON(host->align_addr & 0x3); - host->sg_count = dma_map_sg(mmc_dev(host->mmc), - data->sg, data->sg_len, direction); - if (host->sg_count == 0) + host->sg_count = sdhci_pre_dma_transfer(host, data, NULL); + if (host->sg_count < 0) goto unmap_align; desc = host->adma_desc; @@ -587,8 +624,9 @@ static void sdhci_adma_table_post(struct sdhci_host *host, } } - dma_unmap_sg(mmc_dev(host->mmc), data->sg, - data->sg_len, direction); + if (!data->host_cookie) + dma_unmap_sg(mmc_dev(host->mmc), data->sg, data->sg_len, + direction); } static u8 sdhci_calc_timeout(struct sdhci_host *host, struct mmc_data *data) @@ -757,11 +795,7 @@ static void sdhci_prepare_data(struct sdhci_host *host, struct mmc_data *data) } else { int sg_cnt; - sg_cnt = dma_map_sg(mmc_dev(host->mmc), - data->sg, data->sg_len, - (data->flags & MMC_DATA_READ) ? - DMA_FROM_DEVICE : - DMA_TO_DEVICE); + sg_cnt = sdhci_pre_dma_transfer(host, data, NULL); if (sg_cnt == 0) { /* * This only happens when someone fed @@ -850,9 +884,11 @@ static void sdhci_finish_data(struct sdhci_host *host) if (host->flags & SDHCI_USE_ADMA) sdhci_adma_table_post(host, data); else { - dma_unmap_sg(mmc_dev(host->mmc), data->sg, - data->sg_len, (data->flags & MMC_DATA_READ) ? - DMA_FROM_DEVICE : DMA_TO_DEVICE); + if (!data->host_cookie) + dma_unmap_sg(mmc_dev(host->mmc), data->sg, + data->sg_len, + (data->flags & MMC_DATA_READ) ? + DMA_FROM_DEVICE : DMA_TO_DEVICE); } } @@ -1116,6 +1152,35 @@ static void sdhci_set_power(struct sdhci_host *host, unsigned short power) * * \*****************************************************************************/ +static void sdhci_pre_req(struct mmc_host *mmc, struct mmc_request *mrq, + bool is_first_req) +{ + struct sdhci_host *host = mmc_priv(mmc); + + if (mrq->data->host_cookie) { + mrq->data->host_cookie = 0; + return; + } + + if (host->flags & SDHCI_REQ_USE_DMA) + if (sdhci_pre_dma_transfer(host, mrq->data, &host->next_data) < 0) + mrq->data->host_cookie = 0; +} + +static void sdhci_post_req(struct mmc_host *mmc, struct mmc_request *mrq, + int err) +{ + struct sdhci_host *host = mmc_priv(mmc); + struct mmc_data *data = mrq->data; + + if (host->flags & SDHCI_REQ_USE_DMA) { + dma_unmap_sg(mmc_dev(host->mmc), data->sg, data->sg_len, + (data->flags & MMC_DATA_WRITE) ? + DMA_TO_DEVICE : DMA_FROM_DEVICE); + data->host_cookie = 0; + } +} + static void sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq) { struct sdhci_host *host; @@ -1285,6 +1350,8 @@ out: } static const struct mmc_host_ops sdhci_ops = { + .pre_req = sdhci_pre_req, + .post_req = sdhci_post_req, .request = sdhci_request, .set_ios = sdhci_set_ios, .get_ro = sdhci_get_ro, @@ -1867,6 +1934,8 @@ int sdhci_add_host(struct sdhci_host *host) if (caps & SDHCI_TIMEOUT_CLK_UNIT) host->timeout_clk *= 1000; + host->next_data.cookie = 1; + /* * Set host parameters. */ diff --git a/include/linux/mmc/sdhci.h b/include/linux/mmc/sdhci.h index 83bd9f7..924e84b 100644 --- a/include/linux/mmc/sdhci.h +++ b/include/linux/mmc/sdhci.h @@ -17,6 +17,11 @@ #include <linux/io.h> #include <linux/mmc/host.h> +struct sdhci_next { + unsigned int sg_count; + s32 cookie; +}; + struct sdhci_host { /* Data set by hardware interface driver */ const char *hw_name; /* Hardware bus name */ @@ -145,6 +150,8 @@ struct sdhci_host { unsigned int ocr_avail_sd; unsigned int ocr_avail_mmc; + struct sdhci_next next_data; + unsigned long private[0] ____cacheline_aligned; }; #endif /* __SDHCI_H */ -- 1.7.4.1

14 years, 10 months

5
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blueprints step by step

by Mounir Bsaibes

I have created a step by step how to create a blueprint, specification and how to make a Technical Requirement blueprint dependant on the engineering blueprint. This is meant to be for new assignees or as a refresher. If you are comfortable in creating blueprints and know the process, you can ignore this note. https://wiki.linaro.org/WorkingGroups/Kernel/GettingStarted/blueprintStepby… If you need clarification on the steps or recommendation for enhancement to this step-by-step, please let me know. Regards, Mounir

14 years, 10 months

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[ACTIVITY] (Arnd Bergmann) 2011-04-18 - 2011-04-21

by Arnd Bergmann

* Spent the entire week catching up on email that accumulated during ELC * DMA memory management * MMC patch review * AXI bus driver * UIO * PTP * macvtap

14 years, 10 months

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[ACTIVITY] (Per Forlin) 2011-04-18 - 2011-04-22

by Per Forlin

== Per Forlin <perfor> == === Highlights === * Discussing mmc nonblock implementation on mmc-mailing list. * Studied block layer and found out that block read request for mmc are often added one by one to the mmc blockdev, this is not the case for scsi disk blockdev. === Absence === 3 days off due to Eastern holiday and chicken pox === Plans === * Make draft for 11.11 specs * Try out different configurations for io-sched

14 years, 10 months

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[ACTIVITY] April 18 - April 22

by Jason Hui

== Jason Liu <Jasnliu> == === Highlights === ====Misc==== * Some u-boot patch upsreaming: MX5: Keep L2 cache enabled before jump to kernel http://lists.denx.de/pipermail/u-boot/2011-April/090437.html MX5: clock: Add clock config interface http://lists.denx.de/pipermail/u-boot/2011-April/090438.html PMIC: Add dialog pmic support http://lists.denx.de/pipermail/u-boot/2011-April/090440.html MX53: loco: Add power init support http://lists.denx.de/pipermail/u-boot/2011-April/090441.html === Plans === * ===Issues=== *

14 years, 10 months

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[ACTIVITY] (Shawn Guo) 2011-04-18 - 2011-04-22

by Shawn Guo

== Device Tree == * The .dtb support has been available in hwpack daily build and lmc v0.0.4. Tested it on mx51 babbage and it works out of box. * With the help from Dave and Nico, the failure of John Bonesio's append-dtb patch on babbage was killed. It's caused by the use of static variable in uncompressed.h, which will not be relocated because it's not in .bss section. * Caught the problem of babbage.dtb memory node, which misses 'device_type' property. == Non-blocking MMC testing == * Added pre_req and post_req for SDHCI driver, but did not see performance gain on mx51 esdhc. No comments from Per Forlin on that so far. * Added pre_req and post_req for for mxs-mmc driver and saw ~4% performance improvement at the best case. Per Forlin gave some comments saying pre_req and post_req were not added correctly. But I do not completely understand his comments and asked him for clarification. No further response yet so far. == Misc == * Respond to Wolfram's comments on sdhci-pltfm&of-consolidation patch set. Will work on the v2 next week. * Reviewed a few mxs/mxc patches. -- Regards, Shawn

14 years, 10 months

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[ACTIVITY] (John Stultz) April 18th - 22nd

by john stultz

== John Stultz <jstultz_vm> == === Highlights === * Pushed out updated Linaro Android tree which resolves the omap3 USB issue and supports HDMI output on PandaBoard, allowing the Android UI to now function on Panda. * Sent out the Posix Alarm Timers patch queue to lkml for review/inclusion. * Rebuilt the Android Trivial tree from latest Android tree: http://git.linaro.org/gitweb?p=people/jstultz/android-trivial.git;a=summary * Sent out an MM patch for review from the Android Trivial Tree. * Sent out six MMC patches for review from the Android Trivial Tree. * Sent clocksource cleanup patch to Magnus Damm to follow up on a conversation we had at ELC. * Submitted a LPC BoF discussion on Kconfig fragments for internal review. * Reviewed and commented on Paul's ASDF presentation * Sent some background info and links to slides to Andy Green for his Android talk in Taiwan. * Synced with Paul about ELC discussions. === Plans === * Continue working on the trivial tree to send out cpufreq and cgroup branches. * Follow up on the trivial tree patches sent out this week. * Nag tglx to queue the Alarm Timers for 2.6.40 * Try to send the virtual battery driver in linaro+android tree out for review. * Try to get time to look at ADB support for Android kernels === Issues === * None.

14 years, 10 months

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[ACTIVITY] (Paul E. McKenney) 2011-04-18 - 2011-04-22

by Paul E. McKenney

== Paul E. McKenney <paulmck> == === Highlights == * Working RCU priority boosting bug: Cheng Xu encountered same bug with user-level program, so this is officially a scheduler bug. Fortunately, my workarounds still are working. * Sent Sedat Dilek two sets of diagnostics thus far, working up a third set. Problem is in wake-up path for per-CPU kthread. * Email and IRC with Thomas Gleixner, Andrew Morton, and Linus Torvalds on maintainership issue. * Interviewed two candidates for Kernel WG, both are +1. A third candidate was no-show. Will set up interview with fourth candidate as soon as I receive contact information. * Pre-Budapest definition/scheduling work. * Met with the incoming Kernel WG lead to review draft plans (which is only fair, given that he will be leading them up). We will put a transition plan together in Budapest. * Debriefed John Stultz on his meeting with the Android guys. John's discussions unearthed an additional suspend-blocker requirement, which I added to the list at [[https://wiki.linaro.org/WorkingGroup/KernelConsolidation/Projects/AndroidSu…. == Miscellaneous == * Another iteration on Lai Jiangshan's RCU_PREEMPT inlining patches

14 years, 10 months

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ASoC conference

by Loïc Minier

Hey Just came across this ASoC end Embedded ALSA Conference: http://www.slimlogic.co.uk/?p=268 Anybody interested in going? Cheers, -- Loïc Minier

14 years, 10 months

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Question on compressed vmlinux .got and .bss sections

by Shawn Guo

Hi toolchain, kernel folks, I'm seeing an interesting thing on .got and .bss sections of arch/arm/boot/compressed/vmlinux, and really need your expertise to shed some lights. I have an uninitialized variable 'uart_base' defined in misc.c. static unsigned long uart_base; $ arm-linux-gnueabi-objdump -D arch/arm/boot/compressed/misc.o Disassembly of section .bss: 00000000 <uart_base>: 0: 00000000 andeq r0, r0, r0 00000004 <__machine_arch_type>: 4: 00000000 andeq r0, r0, r0 [...] And section layout looks like the following. $ arm-linux-gnueabi-objdump -h arch/arm/boot/compressed/vmlinux SECTIOINS { ... _etext = .; _got_start = .; .got : { *(.got) } _got_end = .; .got.plt : { *(.got.plt) } _edata = .; . = ALIGN(4); __bss_start = .; .bss : { *(.bss) } _end = .; ... } $ arm-linux-gnueabi-objdump -h arch/arm/boot/compressed/vmlinux arch/arm/boot/compressed/vmlinux: file format elf32-littlearm Sections: Idx Name Size VMA LMA File off Algn 0 .text 001c474c 00000000 00000000 00008000 2**5 CONTENTS, ALLOC, LOAD, READONLY, CODE 1 .got 00000028 001c474c 001c474c 001cc74c 2**2 CONTENTS, ALLOC, LOAD, DATA 2 .got.plt 0000000c 001c4774 001c4774 001cc774 2**2 CONTENTS, ALLOC, LOAD, DATA 3 .bss 00000020 001c4780 001c4780 001cc780 2**2 ALLOC 4 .stack 00001000 001c47a0 001c47a0 001cc780 2**0 ALLOC 5 .comment 0000002a 00000000 00000000 001cc780 2**0 CONTENTS, READONLY 6 .ARM.attributes 00000031 00000000 00000000 001cc7aa 2**0 CONTENTS, READONLY I'm able to see uart_base in vmlinux objdump ... $ arm-linux-gnueabi-objdump -t arch/arm/boot/compressed/vmlinux [relevant only, and sorted] 00000000 l d .text 00000000 .text 001c474c l d .got 00000000 .got 001c4774 l d .got.plt 00000000 .got.plt 001c4780 l d .bss 00000000 .bss 003968e4 g *ABS* 00000000 _image_size 001c474c g *ABS* 00000000 _got_start 001c4774 g *ABS* 00000000 _got_end 001c4780 g *ABS* 00000000 _edata 001c4780 g *ABS* 00000000 __bss_start 001c4780 l O .bss 00000004 uart_base 001c4798 g O .bss 00000004 malloc_ptr 001c478c g O .bss 00000004 output_ptr 001c479c g O .bss 00000004 malloc_count 001c4794 g O .bss 00000004 free_mem_end_ptr 001c4788 g O .bss 00000004 output_data 001c4784 g O .bss 00000004 __machine_arch_type 001c4790 g O .bss 00000004 free_mem_ptr 001c47a0 g *ABS* 00000000 _end ... but I can not see it in the zImage (all others in .bss seem still there). $ xxd arch/arm/boot/zImage | tail 01c4740: 3ef1 1400 be52 9f58 e468 3900 4c47 1c00 >....R.X.h9.LG.. ^_got_start (why is it?) 01c4750: 9847 1c00 1043 0000 8c47 1c00 9c47 1c00 .G...C...G...G.. ^malloc_ptr ^output_ptr 01c4760: 9447 1c00 080a 0000 8847 1c00 8447 1c00 .G.......G...G.. ^free_mem_end_ptr ^__machine_arch_type 01c4770: 9047 1c00 0000 0000 0000 0000 0000 0000 .G.............. ^free_mem_ptr The following is a run-time memdump at _got_start. Before recalculation: 9056304C: 001C474C 001C4798 00004310 001C478C 001C479C 001C4794 00000A08 001C4788 ^_got_start (why is it?) 9056306C: 001C4784 001C4790 00000000 00000000 00000000 EDFE0DD0 4C010000 38000000 After recalculation (for .bss entries, the delta is 9039EA50, for others in .got, delta is 9039E900): 9056304C: 9056304C 905631E8 903A2C10 905631DC 905631EC 905631E4 9039F308 905631D8 9056306C: 905631D4 905631E0 00000000 00000000 00000000 73FBC000 4C010000 38000000 QUESTION: Where is the .bss section of uart_base? Now, I remove the 'static' to have 'unsigned long uart_base', and dump the same stuff to compare. $ arm-linux-gnueabi-objdump -D arch/arm/boot/compressed/misc.o Disassembly of section .bss: 00000000 <__machine_arch_type>: 0: 00000000 andeq r0, r0, r0 00000004 <uart_base>: 4: 00000000 andeq r0, r0, r0 I'm able to see uart_base in vmlinux objdump ... $ arm-linux-gnueabi-objdump -t arch/arm/boot/compressed/vmlinux [relevant only, and sorted] 00000000 l d .text 00000000 .text 001c4720 l d .got 00000000 .got 001c474c l d .got.plt 00000000 .got.plt 001c4758 l d .bss 00000000 .bss 003968e4 g *ABS* 00000000 _image_size 001c4720 g *ABS* 00000000 _got_start 001c474c g *ABS* 00000000 _got_end 001c4758 g *ABS* 00000000 _edata 001c4758 g *ABS* 00000000 __bss_start 001c475c g O .bss 00000004 uart_base 001c4770 g O .bss 00000004 malloc_ptr 001c4764 g O .bss 00000004 output_ptr 001c4774 g O .bss 00000004 malloc_count 001c476c g O .bss 00000004 free_mem_end_ptr 001c4760 g O .bss 00000004 output_data 001c4758 g O .bss 00000004 __machine_arch_type 001c4768 g O .bss 00000004 free_mem_ptr 001c4778 g *ABS* 00000000 _end ... and I can also see it in the final zImage. $ xxd arch/arm/boot/zImage | tail 01c4710: 221f f1b3 3ef1 1400 be52 9f58 e468 3900 "...>....R.X.h9. 01c4720: 5c47 1c00 2047 1c00 7047 1c00 e442 0000 \G.. G..pG...B.. ^uart_base 01c4730: 6447 1c00 7447 1c00 6c47 1c00 140a 0000 dG..tG..lG...... 01c4740: 6047 1c00 5847 1c00 6847 1c00 0000 0000 `G..XG..hG...... 01c4750: 0000 0000 0000 0000 ........ Surely, it's in the run-time memdump. Before recalculation: 90563020: 001C475C 001C4720 001C4770 000042E4 001C4764 001C4774 001C476C 00000A14 ^uart_base 90563040: 001C4760 001C4758 001C4768 00000000 00000000 00000000 EDFE0DD0 4C010000 After recalculation: 90563020: 905631AC 90563020 905631C0 903A2BE4 905631B4 905631C4 905631BC 9039F314 90563040: 905631B0 905631A8 905631B8 00000000 00000000 00000000 EDFE0DD0 4C010000 So it looks the non-static ('g') uninitialized variable sits in .bss sections well, while static ('l') one is not there. Is this expected? How the static one is being addressed? Or ask where the offset for static one is stored? Any info or comments are appreciated. -- Regards, Shawn

14 years, 10 months

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Is VFP or Neon supported in kernel-side code? <EOM>

by Tixy

14 years, 10 months

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[PATCH] dt/flattree: Fix return value of early_init_dt_scan_memory

by Shawn Guo

It fixes the return value of funciont early_init_dt_scan_memory on the success return path. Signed-off-by: Shawn Guo <shawn.guo(a)linaro.org> --- drivers/of/fdt.c | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/drivers/of/fdt.c b/drivers/of/fdt.c index c9db49c..387336d 100644 --- a/drivers/of/fdt.c +++ b/drivers/of/fdt.c @@ -659,7 +659,7 @@ int __init early_init_dt_scan_memory(unsigned long node, const char *uname, early_init_dt_add_memory_arch(base, size); } - return 0; + return 1; } int __init early_init_dt_scan_chosen(unsigned long node, const char *uname, -- 1.7.4.1

14 years, 10 months

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[ACTIVITY] (Per Forlin) 2011-04-11 - 2011-04-15

by Per Forlin

== Per Forlin <perfor> == === Highlights === * integrated mmc none blocking in our internal tree at ST-Ericsson to be able to piggy back on testing. * started to investigate (specs for next cycle) how reads propagates from user space down to mmc framework through io-scheduler and block layer. === Absence === Friday === Plans === * Specs for next cycle * Refactor "mmc none blocking" based on feedback

14 years, 10 months

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[ACTIVITY] (John Stultz) April 11th-15th

by john stultz

== John Stultz <jstultz_vm> == === Highlights === * Gave my Presentation "Android OS on Servers?" at ELC * Got to have a number of really useful conversations at ELC * Attended a meeting with Google Android developers === Plans === * Catching up from being out last week and summarize my ELC experience * Get inject_sleep_time patch sent to lkml/google devs for review. * Get Linaro Android kernel updated, tested and pushed out for consumption * Try to respin and push out the Android trivial-tree mmc patches for discussion === Issues === * Not enough time! :)

14 years, 10 months

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[ACTIVITY] (Thomas Abraham) 2011-04-12 - 2011-04-18

by Thomas Abraham

[ACTIVITY] (Thomas Abraham) 2011-04-12 - 2011-04-18 == Thomas Abraham <thomas_ab> == === Highlights === * Continued testing of kexec-reboot failure of smdkv310 board - Does not seem to be a issue with L2 cache enabled. - Found with jtag that uart stops transmitting data after L2 cache is disabled and hence no more console display. - Need further debugging on this. * Not much progress with kexec-crashdump on s5pv310 when using slub allocator. - Works fine when using slub allocator. * Working on converting Samsung clock code to use common clock framework. - works on s5pv310 platform but need to extend it to all other Samsung platforms * Working on extending clkdev support to all other Samsung platforms. * Submitted third version of clkdev patch series for s5pv310 platform. - http://www.mail-archive.com/linux-samsung-soc@vger.kernel.org/msg04529.html * Submitted bug fixes to to solve ethernet and sd/mmc card detection issues on smdkv310 board. === Plans === * Complete clkdev and common clock support for all Samsung platforms. === Issues === * None.

14 years, 10 months

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[ACTIVITY] (Arnd Bergmann) 2011-04-01 - 2011-04-15

by Arnd Bergmann

== Conferences == * Talked at Linux Filesystem and Storage summit about flash drive problems and how we can solve them * Participated in the kernel developer panel at Collaboration Summit: http://lwn.net/Articles/438155/ * Presented my research at Embedded Linux Conference * Gave a keynote at Embedded Linux Conference == Kernel == * Only few reviews this time, due to traveling: u8500-hsem, spear pcie, sysfs-soc representation, mmc == Other == * Vacation between the conferences

14 years, 10 months

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[ACTIVITY] (Shawn Guo) 2011-04-11 - 2011-04-15

by Shawn Guo

== Device Tree == * The make-dtbs patch has been merged by John Rigby on the linux-linaro-natty tree. * After a couple rounds of review given by Loic, the lmc dtb support on branch lp:~shawnguo/linaro-image-tools/add-dtb has been approved by Loic for merging lmc trunk. == Misc == * Played Per Forlin's non-blocking mmc patch set on mx51 esdhc and mx28 mxs-mmc, sent the patches of adding pre_req and post_req support on these two controllers for reviewing. * Reviewed the mxs gpmi device patch and a few i.mx consolidation patches posted by Uwe. -- Regards, Shawn

14 years, 10 months

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[ACTIVITY] (Paul E. McKenney) 2011-04-11 - 2011-04-15

by Paul E. McKenney

== Paul E. McKenney <paulmck> == === Highlights == * Working RCU priority boosting bug: found workaround that passes testing!!! * Chasing the above bug suggested a number of possible simplifications, some of which might actually be worthwhile * Sedat Dilek found a bug in a related patch, will reorganize tree to send him diagnostics along with that particular patch * Found and fixed kexec bug in Power, but someone else beat me to it by one day * Attended ELC: Google Android discussions and ARM maintainership issue == Miscellaneous == * We have a couple of possible solutions for Lai Jiangshan's RCU_PREEMPT inlining patches

14 years, 10 months

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[ACTIVITY] (Dave Martin) week 15 2011 (2011-04-11 - 2011-04-15)

by Dave Martin

== Dave Martin <dmart> == === Activity === ==== hardware-n-kernel-standard-architecture ==== * Reposted VFP coredumps patch -- no further traffic. * Investigated the status of ftrace with regard to Thumb-2. The implementation appears already to be there and seems to work, including dymamic ftrace. ==== miscellaneous ==== * Ongiong activity helping support linaro validation farm activities (network, u8500 bringup). Got bootloader reflashing working, but we don't have a working bootloader image yet. === Plans === * Ping upstream re outstanding patches. * Resume imx51 Thumb-2 investigations === Absences === * Apr 21 2011 - May 2 2011

14 years, 10 months

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Fwd: Is VFP or Neon supported in kernel-side code? <EOM>

by Dave Martin

---------- Forwarded message ---------- From: Dave Martin <dave.martin(a)linaro.org> Date: Thu, Apr 14, 2011 at 5:01 PM Subject: Re: Is VFP or Neon supported in kernel-side code? <EOM> To: Tixy <tixy(a)yxit.co.uk> > Is VFP or Neon supported in kernel-side code? Currently, no. There is some possible future work to see if we can enable this, to allow acceleration of some number-crunching algorithms in the kernel, but it's not implemented yet. For now, I think it's reasonable simply to reject attempts to insert kprobes on VFP/NEON instructions (as we must for cp15). I think that these instructions are never used at the entry/exit points of compiler-generated functions -- in any case, we build the kernel with -msoft-float, so actually the compiler should never implicitly generate these instructions at all. Cheers ---Dave On Thu, Apr 14, 2011 at 2:21 PM, Tixy <tixy(a)yxit.co.uk> wrote: > > > > _______________________________________________ > linaro-kernel mailing list > linaro-kernel(a)lists.linaro.org > http://lists.linaro.org/mailman/listinfo/linaro-kernel >

14 years, 10 months

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[PATCH 1/2] arm/dt: Fix broken dtbs rule.

by Grant Likely

On recent make, commit 1449fb96, "arm/dt: Add a make rule to build dtb for enabled boards" breaks build of the kernel immediately: /projects/linaro/linux-2.6/arch/arm/Makefile:292: *** mixed implicit and normal rules. Stop. > $ rpm -q make > make-3.82-4.fc15.x86_64 > > ''The previous behavior of mixing implicit and pattern rules in one line > like that was never supported or documented, but due to a "hole" in the > parser it worked for certain specific cases (for example, reversing that > line so the pattern comes first would not work, nor would adding extra > explicit targets after the pattern target). > > In 3.82, the parser was tightened in this respect and that "hole" was > closed, hence you see this error.'' This patch splits the rule to fix the bug. Reported-by: Andy Green <andy.green(a)linaro.org> Signed-off-by: Grant Likely <grant.likely(a)secretlab.ca> --- arch/arm/Makefile | 6 +++++- 1 files changed, 5 insertions(+), 1 deletions(-) diff --git a/arch/arm/Makefile b/arch/arm/Makefile index 1be856a..4570ca7 100644 --- a/arch/arm/Makefile +++ b/arch/arm/Makefile @@ -289,7 +289,10 @@ zImage Image xipImage bootpImage uImage: vmlinux zinstall uinstall install: vmlinux $(Q)$(MAKE) $(build)=$(boot) MACHINE=$(MACHINE) $@ -dtbs %.dtb: +%.dtb: + $(Q)$(MAKE) $(build)=$(boot) MACHINE=$(MACHINE) $(boot)/$@ + +dtbs: $(Q)$(MAKE) $(build)=$(boot) MACHINE=$(MACHINE) $(boot)/$@ # We use MRPROPER_FILES and CLEAN_FILES now @@ -308,6 +311,7 @@ define archhelp echo ' uImage - U-Boot wrapped zImage' echo ' bootpImage - Combined zImage and initial RAM disk' echo ' (supply initrd image via make variable INITRD=<path>)' + echo ' dtbs - Build device tree blobs for enabled boards' echo ' install - Install uncompressed kernel' echo ' zinstall - Install compressed kernel' echo ' uinstall - Install U-Boot wrapped compressed kernel'

14 years, 10 months

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[PATCH] arm/dt: Fix broken dtbs rule.

by Grant Likely

On recent make, commit 1449fb96, "arm/dt: Add a make rule to build dtb for enabled boards" breaks build of the kernel immediately: /projects/linaro/linux-2.6/arch/arm/Makefile:292: *** mixed implicit and normal rules. Stop. > $ rpm -q make > make-3.82-4.fc15.x86_64 > > ''The previous behavior of mixing implicit and pattern rules in one line > like that was never supported or documented, but due to a "hole" in the > parser it worked for certain specific cases (for example, reversing that > line so the pattern comes first would not work, nor would adding extra > explicit targets after the pattern target). > > In 3.82, the parser was tightened in this respect and that "hole" was > closed, hence you see this error.'' This patch splits the rule to fix the bug. Reported-by: Andy Green <andy.green(a)linaro.org> Signed-off-by: Grant Likely <grant.likely(a)secretlab.ca> --- arch/arm/Makefile | 6 +++++- 1 files changed, 5 insertions(+), 1 deletions(-) diff --git a/arch/arm/Makefile b/arch/arm/Makefile index 1be856a..4570ca7 100644 --- a/arch/arm/Makefile +++ b/arch/arm/Makefile @@ -289,7 +289,10 @@ zImage Image xipImage bootpImage uImage: vmlinux zinstall uinstall install: vmlinux $(Q)$(MAKE) $(build)=$(boot) MACHINE=$(MACHINE) $@ -dtbs %.dtb: +%.dtb: + $(Q)$(MAKE) $(build)=$(boot) MACHINE=$(MACHINE) $(boot)/$@ + +dtbs: $(Q)$(MAKE) $(build)=$(boot) MACHINE=$(MACHINE) $(boot)/$@ # We use MRPROPER_FILES and CLEAN_FILES now @@ -308,6 +311,7 @@ define archhelp echo ' uImage - U-Boot wrapped zImage' echo ' bootpImage - Combined zImage and initial RAM disk' echo ' (supply initrd image via make variable INITRD=<path>)' + echo ' dtbs - Build device tree blobs for enabled boards' echo ' install - Install uncompressed kernel' echo ' zinstall - Install compressed kernel' echo ' uinstall - Install U-Boot wrapped compressed kernel'

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cycle 11.11 kernel planning (linaro-kernel@lists.linaro.org)

by mounir.bsaibes＠linaro.org

I've shared a document with you: cycle 11.11 kernel planning https://spreadsheets.google.com/ccc?key=0AoZqvK7R1biJdHotS19UamEtVEdjMWd4VW… It's not an attachment -- it's stored online at Google Docs. To open this document, just click the link above.

14 years, 10 months

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[ACTIVITY] (Thomas Abraham) 2011-04-05 - 2011-04-11

by Thomas Abraham

== Thomas Abraham <thomas_ab> == === Highlights === * Tested kexec-reboot on s5pv310. - Works if L2 cache is disabled. - Debugging kernel reboot failure with L2 cache enabled. * Tested kexec-crashdump on s5pv310. - Works fine if capture kernel uses slab allocator but fails when using slub allocator. - With slub allocator, capture kernel crashes accessing a invalid virtual memory location. - Debugging the cause of capture kernel crash. === Plans === * Fix issues with kexec-reboot and kexec-crashdump for s5pv310 platform. === Issues === * None.

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[PATCH 1/2] Remove unnecessary CONFIG_SYS_BOOTMAPSZ definition

by Shawn Guo

Since the following commit, definition CONFIG_SYS_BOOTMAPSZ is not needed any more. 7a02a39babb44f2ca2777db9b3a93be79111bba8 Remove device tree booting dependency on CONFIG_SYS_BOOTMAPSZ Signed-off-by: Shawn Guo <shawn.guo(a)linaro.org> --- include/configs/mx51evk.h | 1 - include/configs/mx53evk.h | 1 - include/configs/mx53loco.h | 1 - 3 files changed, 0 insertions(+), 3 deletions(-) diff --git a/include/configs/mx51evk.h b/include/configs/mx51evk.h index 6a785f8..febe8d8 100644 --- a/include/configs/mx51evk.h +++ b/include/configs/mx51evk.h @@ -227,6 +227,5 @@ #define CONFIG_SYS_MMC_ENV_DEV 0 #define CONFIG_OF_LIBFDT -#define CONFIG_SYS_BOOTMAPSZ 0x800000 #endif diff --git a/include/configs/mx53evk.h b/include/configs/mx53evk.h index 5749a08..74aee89 100644 --- a/include/configs/mx53evk.h +++ b/include/configs/mx53evk.h @@ -193,6 +193,5 @@ #define CONFIG_SYS_MMC_ENV_DEV 0 #define CONFIG_OF_LIBFDT -#define CONFIG_SYS_BOOTMAPSZ 0x800000 #endif /* __CONFIG_H */ diff --git a/include/configs/mx53loco.h b/include/configs/mx53loco.h index 9c7dcc9..884b36b 100644 --- a/include/configs/mx53loco.h +++ b/include/configs/mx53loco.h @@ -194,6 +194,5 @@ #define CONFIG_SYS_MMC_ENV_DEV 0 #define CONFIG_OF_LIBFDT -#define CONFIG_SYS_BOOTMAPSZ 0x800000 #endif /* __CONFIG_H */ -- 1.7.4.1

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[ACTIVITY] week 1113 and week 1114

by Mian Yousaf Kaukab

== m-y == === Highlights === * Patch set for DMA support in USB for U8500 still waiting for the maintainer's attention * Currently helping out the landing team to support USB on Snowball with kernel v2.6.38. Both host and peripheral sides are working. Further testing is in progress. === Plans === * Add battery charging support in AB8500-usb driver. Thanks, -- Mian Yousaf Kaukab

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[ACTIVITY] (Shawn Guo) 2011-04-04 - 2011-04-08

by Shawn Guo

== Device Tree == * The patch of dtb-make-rule got merged on Nico's tree, and sent a follow-up patch to address the mixing rules issue with make 3.82 reported by Andy Green. * Added .dtb files into linaro-image-*.deb package and sent John Rigby the patch for including in the next release of linaro natty tree. * Added lmc dtb support for omap and mx5 based boards, and the patch is being reviewed. == Misc == * Had the Hungary VISA interview -- Regards, Shawn

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Add dtb support for lmc

by Shawn Guo

Hi Loic, I have lmc dtb support added for omap and mx5 at branch [1]. Can you please help review the changes? I believe you will have comments there :) Here are some notes I want to share. * I chose not to add any argument to lmc for differentiating the boards which do not support dt yet from those which already do. Instead, I use board properties 'dtb_addr' and 'dtb_name'. With this approach, all the changes will be limited in boards.py. And also considering that the current solution may be temporary and we will ultimately support dtb by appending it to kernel image, it may be reasonable to save one lmc argument for temporary dtb support. * Board 'igep' is being split into 'igepv2' and 'igepv3', as they get different .dtb files. * Boards 'vexpress' and 'ux500' do not get supported, as there is no dt support for them yet in kernel tree (no .dts for the boards). * Though dt support for 'smdkv310' has been available in kernel tree, I did not add the dtb support in lmc for it, because bug 727978 makes the board so unique in terms of installing and loading boot files. And I'm seeing some recent activity of addressing the bug, so I would hold this board for a while. * Boards 'tegra-harmony', 'versatile-ab' and 'versatile-pb' have already got dt support in kernel tree, but lmc does not support them at all. * This branch can not be merged into trunk for working with daily build hwpack before John Rigby gets .dtb files be there. [1] lp:~shawnguo/linaro-image-tools/add-dtb -- Regards, Shawn

14 years, 10 months

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[ACTIVITY](John Stultz) April 4th-8th

by john stultz

== John Stultz <jstultz_*> == === Highlights === * Got Linaro Android kernel working with HDMI on PandaBoard! * Added capability limits to Posix Alarm Timer patches * Lots of tweaking and practicing of my ELC presentation. * Worked with Alexander to add some Linaro Android Platform items to the presentation * Thomas pulled in a bunch of timekeeping cleanups for 2.6.40 * Nagged tglx to pull RTC fixes for 2.6.39 * Ran into a weird OMAP4 display issue that was later not reproducible. * jcrigby hit it later and figured it out. * Assisted with internal IBM bugs. === Plans === * Attending & Presenting at ELC next week, will be online occasionally * Planning on meeting with some of the Android devs at ELC to talk about upstreaming. * Work on timerfd support for alarm timers. === Issues === * OMAP3 USB issue is still holding back Linaro Android kernel. * https://bugs.edge.launchpad.net/linux-linaro/+bug/747639 * Spent some time trying to figure this out myself, but no luck. * Ping'ed Keshava at TI, but he's out next week, so little progress expected.

14 years, 10 months

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[ACTIVITY] (Paul E. McKenney) 2011-04-04 - 2011-04-08

by Paul E. McKenney

== Paul E. McKenney <paulmck> == === Highlights == * Working RCU priority boosting bug: continue debugging * Coded and tested more diagnostics to track down this bug * Found and fixed another bug, more bugs remain * More Power preemption bugs exposed, improved diagnostics and chasing these (no 16-PCU ARM systems available) * Worked another stuck TSC license request, now caught up * Worked ARM subarchitecture maintainership issue == Miscellaneous == * RCU_PREEMPT inlining patches from Lai Jiangshan met resistance, helping to work out a solution (good resistance, solution will have pure C code instead of automatically generated numerical offsets)

14 years, 10 months

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Fw: Cortex ARMv7 Programmer's Guide / Memory Management / Kernel patch coordination

by Paul E. McKenney

FYI -- new ARM reference manual! This may be downloaded from: https://wiki.linaro.org/Internal/OfficeofCTO Please pass any feedback to David Rusling. Thanx, Paul ----- Forwarded message from David Rusling <david.rusling(a)linaro.org> ----- Date: Tue, 5 Apr 2011 14:02:39 +0100 From: David Rusling <david.rusling(a)linaro.org> To: octo(a)linaro.org, Linaro Tech Leads <techleads(a)linaro.org>, "Paul E. McKenney" <paulmck(a)linux.vnet.ibm.com>, Arnd Bergmann <arnd(a)arndb.de>, Nicolas Pitre <nicolas.pitre(a)linaro.org> Subject: Cortex ARMv7 Programmer's Guide / Memory Management / Kernel patch coordination X-Mailer: Apple Mail (2.1084) All, several topics in one, please see https://wiki.linaro.org/Internal/OfficeofCTO: [1] Programmer's guide - available to everyone in Linaro, not to be redistributed outside. This is a beta and will be released once comments have been collected. Please pass it on to your team members. [2] Memory management - I've outlined the problem and the solution, please give feedback. Jesse owns the execution. [3] Kernel patch coordination - I've outlined the problem and the solution, please give feedback. Based on comments, discussions etc. Please feed any comments to Paul McAteer <Paul.McAteer(a)arm.com> [2] and [3] are not completely disconnected Dave David Rusling, CTO http://www.linaro.org Linaro Lockton House Clarendon Rd Cambridge CB2 8FH ----- End forwarded message -----

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[ACTIVITY] (Dave Martin) week 14 2011 (2011-04-04 - 2011-04-08)

by Dave Martin

== Dave Martin <dmart> == === Activity === ==== hardware-n-kernel-standard-architecture ==== * VFP coredumps patch moving forwards after some fixes. gdb/bfd support now implemented by Ulrich Weigand and confirmed to work. * Spent a bit of time investigating Thumb-2 for imx51 kernels, resulting in some upstream patch discussions. ==== miscellaneous ==== * Minor ongiong activity helping support linaro validation farm activities (network, u8500 bringup) === Plans === * Ping upstream re outstanding patches. * Assess ftrace status. * Write up the output from the Freescale i.MX BSP review discussion, and post for comment. === Absences === * Apr 21 2011 - May 2 2011 (unconfirmed)

14 years, 10 months

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[git pull] device tree changes for linaro-2.6.38

by Grant Likely

Nicolas, here are a couple more changes needed for the 11.05 release. The most important one is Shawn's patch to add a 'dtbs' rule for building all the configured dtb files which is needed for packaging. The second adds device tree support for the IGEP which has been build tested, but that's it since I don't have hardware and I've not cornered anyone to test it yet. I've got it at the top of tree so you can just commit HEAD~1 if you're not comfortable merging that one yet. Can I get a volunteer with an IGEP to test this tree and make sure it boots with the devicetree? Thanks, g. The following changes since commit 7c4bc9c2662c6d9840afed0e29eb01314af9bb78: ARM: Only allow PM_SLEEP with CPUs which support suspend (2011-04-04 00:25:21 -0400) are available in the git repository at: git://git.secretlab.ca/git/linux-2.6 devicetree/arm-linaro-2.6.38 Grant Likely (1): arm/dt: Add basic devicetree support to IGEPv2 and v3 Shawn Guo (1): arm/dt: Add a make rule to build dtb for enabled boards arch/arm/Makefile | 2 +- arch/arm/boot/Makefile | 2 ++ arch/arm/boot/dts/isee-igep-v2.dts | 7 +++++++ arch/arm/boot/dts/isee-igep-v3.dts | 7 +++++++ arch/arm/mach-exynos4/Makefile.boot | 2 ++ arch/arm/mach-mx5/Makefile.boot | 5 +++++ arch/arm/mach-omap2/Makefile.boot | 6 ++++++ arch/arm/mach-omap2/board-igep0020.c | 6 ++++++ arch/arm/mach-omap2/board-igep0030.c | 6 ++++++ arch/arm/mach-tegra/Makefile.boot | 2 ++ arch/arm/mach-versatile/Makefile.boot | 2 ++ 11 files changed, 46 insertions(+), 1 deletions(-) create mode 100644 arch/arm/boot/dts/isee-igep-v2.dts create mode 100644 arch/arm/boot/dts/isee-igep-v3.dts -- Grant Likely, B.Sc., P.Eng. Secret Lab Technologies Ltd.

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[PATCH v2] arm/dt: Add a make rule to build dtb for enabled boards

by Shawn Guo

With 'make ARCH=arm dtb', it builds Device Tree Blobs for those boards enabled by build CONFIG. Signed-off-by: Shawn Guo <shawn.guo(a)linaro.org> --- It's based on commit fe8e6d0b0e601ca0a63fe768d4b812d5a45a9da7 "arm/dt: Add dtb make rule" from Rob Herring. And it works against Linaro kernel tree. But it needs to go through mainline review before it gets applied. Changes since v1: * Take suggestion from Rob Herring to move .dts dection into machine sepcific Makefile.boot, so that arch/arm/boot/Makefile can be as clean as it is. arch/arm/Makefile | 3 +++ arch/arm/boot/Makefile | 2 ++ arch/arm/mach-exynos4/Makefile.boot | 2 ++ arch/arm/mach-mx5/Makefile.boot | 5 +++++ arch/arm/mach-omap2/Makefile.boot | 4 ++++ arch/arm/mach-tegra/Makefile.boot | 2 ++ arch/arm/mach-versatile/Makefile.boot | 2 ++ 7 files changed, 20 insertions(+), 0 deletions(-) diff --git a/arch/arm/Makefile b/arch/arm/Makefile index d51ab6c..7fd2af9 100644 --- a/arch/arm/Makefile +++ b/arch/arm/Makefile @@ -292,6 +292,9 @@ zinstall uinstall install: vmlinux %.dtb: $(Q)$(MAKE) $(build)=$(boot) MACHINE=$(MACHINE) $(boot)/$@ +dtb: + $(Q)$(MAKE) $(build)=$(boot) MACHINE=$(MACHINE) $(boot)/$@ + # We use MRPROPER_FILES and CLEAN_FILES now archclean: $(Q)$(MAKE) $(clean)=$(boot) diff --git a/arch/arm/boot/Makefile b/arch/arm/boot/Makefile index 08fc37f..ce39850 100644 --- a/arch/arm/boot/Makefile +++ b/arch/arm/boot/Makefile @@ -63,6 +63,8 @@ endif $(obj)/%.dtb: $(src)/dts/%.dts $(call cmd,dtc) +$(obj)/dtb: $(addprefix $(obj)/, $(dtb-y)) + quiet_cmd_uimage = UIMAGE $@ cmd_uimage = $(CONFIG_SHELL) $(MKIMAGE) -A arm -O linux -T kernel \ -C none -a $(LOADADDR) -e $(STARTADDR) \ diff --git a/arch/arm/mach-exynos4/Makefile.boot b/arch/arm/mach-exynos4/Makefile.boot index d65956f..fcee6b5 100644 --- a/arch/arm/mach-exynos4/Makefile.boot +++ b/arch/arm/mach-exynos4/Makefile.boot @@ -1,2 +1,4 @@ zreladdr-y := 0x40008000 params_phys-y := 0x40000100 + +dtb-$(CONFIG_MACH_SMDKV310) += exynos4-smdkv310.dtb diff --git a/arch/arm/mach-mx5/Makefile.boot b/arch/arm/mach-mx5/Makefile.boot index e928be1..4111462 100644 --- a/arch/arm/mach-mx5/Makefile.boot +++ b/arch/arm/mach-mx5/Makefile.boot @@ -7,3 +7,8 @@ initrd_phys-$(CONFIG_ARCH_MX51) := 0x90800000 zreladdr-$(CONFIG_ARCH_MX53) := 0x70008000 params_phys-$(CONFIG_ARCH_MX53) := 0x70000100 initrd_phys-$(CONFIG_ARCH_MX53) := 0x70800000 + +dtb-$(CONFIG_MACH_MX51_BABBAGE) += mx51-babbage.dtb +dtb-$(CONFIG_MACH_MX51_EFIKAMX) += genesi-efikamx.dtb +dtb-$(CONFIG_MACH_MX51_EFIKASB) += genesi-efikasb.dtb +dtb-$(CONFIG_MACH_MX53_LOCO) += mx53-loco.dtb diff --git a/arch/arm/mach-omap2/Makefile.boot b/arch/arm/mach-omap2/Makefile.boot index 565aff7..0f54901 100644 --- a/arch/arm/mach-omap2/Makefile.boot +++ b/arch/arm/mach-omap2/Makefile.boot @@ -1,3 +1,7 @@ zreladdr-y := 0x80008000 params_phys-y := 0x80000100 initrd_phys-y := 0x80800000 + +dtb-$(CONFIG_MACH_OMAP3_BEAGLE) += omap3-beagle.dtb +dtb-$(CONFIG_MACH_OMAP4_PANDA) += omap4-panda.dtb +dtb-$(CONFIG_MACH_OVERO) += omap3-overo.dtb diff --git a/arch/arm/mach-tegra/Makefile.boot b/arch/arm/mach-tegra/Makefile.boot index db52d61..c98addf 100644 --- a/arch/arm/mach-tegra/Makefile.boot +++ b/arch/arm/mach-tegra/Makefile.boot @@ -1,3 +1,5 @@ zreladdr-$(CONFIG_ARCH_TEGRA_2x_SOC) := 0x00008000 params_phys-$(CONFIG_ARCH_TEGRA_2x_SOC) := 0x00000100 initrd_phys-$(CONFIG_ARCH_TEGRA_2x_SOC) := 0x00800000 + +dtb-$(CONFIG_MACH_HARMONY) += tegra-harmony.dtb diff --git a/arch/arm/mach-versatile/Makefile.boot b/arch/arm/mach-versatile/Makefile.boot index c7e75ac..e2227d3 100644 --- a/arch/arm/mach-versatile/Makefile.boot +++ b/arch/arm/mach-versatile/Makefile.boot @@ -2,3 +2,5 @@ params_phys-y := 0x00000100 initrd_phys-y := 0x00800000 +dtb-$(CONFIG_ARCH_VERSATILE_PB) += versatile-pb.dtb +dtb-$(CONFIG_MACH_VERSATILE_AB) += versatile-ab.dtb -- 1.7.1

14 years, 10 months

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[ACTIVITY] April 1 - April 8

by Jason Hui

== Jason Liu <Jasnliu> == === Highlights === ====DT==== * The basic DT for imx51 babbage, genesi efika mx and imx53 loco board support done, merged into linaro kernel git. ====Kernel kexec ==== * Blueprint: https://blueprints.launchpad.net/linux-linaro/+spec/other-kernel-kexec * [jason] Test kexec-reboot on Freescale platforms: Done * [jason] Test kexec-crashdump on Freescale platforms: Done * I have test the kexec-reboot on Freescale i.mx51 babbage board based on the following git: * kexec:git://git.kernel.org/pub/scm/linux/kernel/git/ebiederm/kexec-tools-de… * linux:git://git.linaro.org/kernel/linux-linaro-2.6.38.git * The kexec works fine with my test result: * kexec-reboot, the second kernel can boot up successfully, log is the following: root@freescale ~$ ./kexec -l uImage --type=uImage --append="console=ttymxc0,115200 initcall_debug" root@freescale ~$ ./kexec -e Starting new kernel Bye! Uncompressing Linux... done, booting the kernel. Linux version 2.6.38.2+ (r64343@r64343-desktop) (gcc version 4.3.3 (Sourcery G++ Lite 2009q1-203) ) #2 Wed Apr 6 15:59:06 CST 2011 * kexec-crashdump, /proc/vmcore is created after boot up capture kernel, log is the following: root@freescale ~$ kexec -p /zImage -t zImage --append="console=ttymxc0,115200 root=/dev/nfs ip=dhcp nfsroot=10.192.242.36:/rootfs_home/mx5_rootfs rw" root@freescale ~$ echo "c" > /proc/sysrq-trigger SysRq : Trigger a crash Unable to handle kernel NULL pointer dereference at virtual address 00000000 pgd = dfab8000 [00000000] *pgd=af97b831, *pte=00000000, *ppte=00000000 Internal error: Oops: 817 [#1] last sysfs file: /sys/devices/system/cpu/cpu0/crash_notes Modules linked in: [...] Code: e3a03001 e5823000 f57ff04f e3a02000 (e5c23000) Loading crashdump kernel... Bye! Uncompressing Linux... done, booting the kernel. Linux version 2.6.38.2+ (r64343@r64343-desktop) (gcc version 4.3.3 (Sourcery G++ Lite 2009q1-203) ) #6 Thu Apr 7 17:12:06 CST 2011 CPU: ARMv7 Processor [412fc085] revision 5 (ARMv7), cr=10c53c7f CPU: VIPT nonaliasing data cache, VIPT aliasing instruction cache Machine: Freescale MX51 Babbage Board Memory policy: ECC disabled, Data cache writeback Built 1 zonelists in Zone order, mobility grouping on. Total pages: 32258 Kernel command line: console=ttymxc0,115200 root=/dev/nfs ip=dhcp nfsroot=10.192.242.36:/rootfs_home/mx5_rootfs rw elfcorehdr=0x9ef00000 mem=130048K PID hash table entries: 512 (order: -1, 2048 bytes) Dentry cache hash table entries: 16384 (order: 4, 65536 bytes) Inode-cache hash table entries: 8192 (order: 3, 32768 bytes) Memory: 127MB = 127MB total [...] root@freescale ~$ ls -l /proc/vmcore -r-------- 1 root root 402653500 Jan 1 00:00 /proc/vmcore ====Misc==== * Enable L2 cache support in i.mx51/53 uboot. === Plans === * ===Issues=== *

14 years, 10 months

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[ACTIVITY] (Per Forlin) 2011-04-04 - 2011-04-08

by Per Forlin

== Per Forlin <perfor> == === Highlights === * mmc none blocking "PATCH v2" sent out. All tests pass, * Made a really basic draft for storage work 1111. https://wiki.linaro.org/WorkingGroups/Kernel/Specs/StoragePerf_1111_tmp * mmc none blocking gets same performance independent of governor. https://wiki.linaro.org/WorkingGroups/Kernel/Specs/StoragePerfMMC-async-req… === Absence === Wednesday and Friday due child sickness === Plans === * Compare EMMC performace DDR vs no DDR. * Write mmc_test for TRIM

14 years, 10 months

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[PATCH] LINARO: Build .dtb files for packaging

by Shawn Guo

From: Shawn Guo <shawn.guo(a)linaro.org> Signed-off-by: Shawn Guo <shawn.guo(a)linaro.org> --- Hi John, After pulling the latest bits from Nico's tree, you should be able apply this patch on linux-linaro-natty and get .dtb files built in linux-image-*.deb. Regards, Shawn debian/rules.d/2-binary-arch.mk | 6 ++++++ 1 files changed, 6 insertions(+), 0 deletions(-) diff --git a/debian/rules.d/2-binary-arch.mk b/debian/rules.d/2-binary-arch.mk index 93114b2..815d134 100644 --- a/debian/rules.d/2-binary-arch.mk +++ b/debian/rules.d/2-binary-arch.mk @@ -36,6 +36,7 @@ $(stampdir)/stamp-build-%: prepare-% @echo "Building $*..." $(build_cd) $(kmake) $(build_O) $(conc_level) $(build_image) $(build_cd) $(kmake) $(build_O) $(conc_level) modules + $(build_cd) $(kmake) $(build_O) $(conc_level) dtbs @touch $@ # Install the finished build @@ -71,6 +72,11 @@ endif $(pkgdir)/boot/abi-$(abi_release)-$* install -m600 $(builddir)/build-$*/System.map \ $(pkgdir)/boot/System.map-$(abi_release)-$* + + mkdir -p $(pkgdir)/boot/dt-$(abi_release)-$*/ + install -m600 -D $(builddir)/build-$*/arch/$(build_arch)/boot/*.dtb \ + $(pkgdir)/boot/dt-$(abi_release)-$*/ + ifeq ($(no_dumpfile),) makedumpfile -g $(pkgdir)/boot/vmcoreinfo-$(abi_release)-$* \ -x $(builddir)/build-$*/vmlinux -- 1.7.1

14 years, 10 months

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My list of topics/tasks for Linaro 11.11 cycle

by Grant Likely

Hey Paul, As promised, here is my list of topics, tasks and priorities for the 11.11 cycle. It's a bit of a rough list, but I'll refine it as we get closer to UDS Boot Architecture - Refine UEFI position paper (draft of position paper will be prepared before UDS) - Refine boot architecture technical recommendations paper (draft will be prepared before UDS) - must include reference implementation (based on existing u-boot; not talking about writing something new here) - Upgrade procedure for OS - Upgrade procedure for Firmware - Security concerns? - Must guarantee reliability (no bricked boards). - Discuss kexec bootloader, possibly implement for 11.11 cycle - Implement appending of device tree and initrd to zImage - To support minimal bootloader and kexec bootloaders. - Simplify the process of installing a boot image. - Implement device tree bindings to describing boot method - So that Linux knows how to upgrade the kernel and possibly the bootloader. - SDcard? NAND? NOR? Which partition? etc. I've got a lot of topics on boot architecture. Most of the needed technology is in place, but I think it is needed to document best practices and methods that should be used when designing a system. What technologies, why, how to put them together, and how to maintain/support them. It's important to get the guidelines out onto paper instead of as 'tribal knowledge' Device Tree - device tree board description and implementations for: - The omap3 boards are the priority since there are numerous expansion boards that can be described (Zippy, trainer, etc) which is an excellent use-case. - mx51 & mx53 eval and efika boards - samsung eval boards - OMAP3 BeagleBoard, Overo and IGEP boards. - device tree SoC descriptions for SoCs - A lot of work has already been done for Samsung and Freescale SoCs. It would be very interesting to converting an entire SoC over to use device tree with dtb linked into the kernel for bootloaders that cannot pass a dtb blob. That would eliminate the problem of duplicate setup paths - Would also need task to support linking multiple .dtbs into the kernel - Complete clock bindings - mostly depends on common clock framework - Complete virq implementation - **critical task** Linux ARM Maintainership/Vision - Full multiplatform - Support multiple SoC families with a single kernel - to avoid either/or decisions when adding new features to the kernel - have guidelines for how new interfaces should be defined. Example: right now struct clk has a different implementation for every SoC, and only one can be compiled in at a time. New interfaces should be runtime pluggable wherever possible - to increase code coverage for allyesconfig/allmodconfig. - Document best practices for Linux driver model - Where does data come from (probed, device tree, platform_data) - How to generalize as much device registration as possible - How to get away from big lists of devices in board-*.c files. - How to reduce code duplication. Basically, I'd like to encourage embedded Linux engineers to think about the wider scope for the code that they write. To ask themselves if the work they are doing could be useful to the wider ARM Linux infrastructure. I'm not sure how to translate the above items into blueprints, but I think the tasks resolve to writing a lot of documentation and articles, and probably reviewing a lot of code. You can probably take the first level bullet points in each category as names for blueprints. My priorities are to make sure at least one platform has a 100% complete device tree implementation by the 11.11 release, and that there is a good set of documentation to go with it covering both boot architecture and device tree. I'd actually like to see 2 or 3 platforms with a complete implementation, but I'd rather see 1 platform will a full solution than 3 half baked ones. Close second is the boot architecture documentation and any associated sample implementation. Loïc, David, I'm sure I've missed some of the topics we've talked about. Is there anything else you can think of that should be added to this list? g. -- Grant Likely, B.Sc., P.Eng. Secret Lab Technologies Ltd.

14 years, 10 months

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[ACTIVITY] (Paul E. McKenney) 2011-03-28 - 2011-04-01

by Paul E. McKenney

== Paul E. McKenney <paulmck> == === Highlights == * Working RCU priority boosting bug: reproduced slowdown (not hang) * Coded and tested diagnostics to track down this bug * Found and fixed one bug, more bugs remain * Worked more stuck TSC license requests == Miscellaneous == * Pulled in kfree_rcu() patches from Lai Jiangshan: Nice API addition and code-size reduction *

14 years, 10 months

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[ACTIVITY] (Per Forlin) 2011-03-28 - 2011-04-01

by Per Forlin

== Per Forlin <perfor> == === Highlights === * mmc none blocking implementation is more stable, but there are still some issues when running stress tests for many hours. * In contact with developer at Samsung that is interested in testing my code on the Samsung SoC. * Started to think about storage work for next cycle === Plans === * Make all stress tests to pass for mmc code and send out patches on 2.6.39-rc * Assist in writing storage spec * Continue supporting testing of my mmc code on other boards.

14 years, 10 months

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