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Filename Latest commit message Latest commit date
Baolin Wang f4cfdfa01c UPSTREAM: mmc: Add MMC host software queue support 
Now the MMC read/write stack will always wait for previous request is
completed by mmc_blk_rw_wait(), before sending a new request to hardware,
or queue a work to complete request, that will bring context switching
overhead and spend some extra time to poll the card for busy completion
for I/O writes via sending CMD13, especially for high I/O per second
rates, to affect the IO performance.

Thus this patch introduces MMC software queue interface based on the
hardware command queue engine's interfaces, which is similar with the
hardware command queue engine's idea, that can remove the context
switching. Moreover we set the default queue depth as 64 for software
queue, which allows more requests to be prepared, merged and inserted
into IO scheduler to improve performance, but we only allow 2 requests
in flight, that is enough to let the irq handler always trigger the
next request without a context switch, as well as avoiding a long latency.

Moreover the host controller should support HW busy detection for I/O
operations when enabling the host software queue. That means, the host
controller must not complete a data transfer request, until after the
card stops signals busy.

From the fio testing data in cover letter, we can see the software
queue can improve some performance with 4K block size, increasing
about 16% for random read, increasing about 90% for random write,
though no obvious improvement for sequential read and write.

Moreover we can expand the software queue interface to support MMC
packed request or packed command in future.

bug: 151514181
Change-Id: Ib343d80bf060c2c6543e6038b474f3c5bf93dbb2
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Baolin Wang <baolin.wang@linaro.org>
Signed-off-by: Baolin Wang <baolin.wang7@gmail.com>
Link: https://lore.kernel.org/r/4409c1586a9b3ed20d57ad2faf6c262fc3ccb6e2.1581478568.git.baolin.wang7@gmail.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
(cherry picked from commit 511ce378e16f07b66ab78118587b7cc6ac197364)
2020-04-08 09:29:46 -07:00
arch ANDROID: GKI: Remove SCHED_AUTOGROUP 2020-04-07 16:02:18 -07:00
block ANDROID: block: require drivers to declare supported crypto key type(s) 2020-04-07 17:58:49 +00:00
certs
crypto This is the 5.4.23 stable release 2020-03-01 10:17:44 +01:00
Documentation This is the 5.4.29 stable release 2020-04-02 14:26:14 +02:00
drivers UPSTREAM: mmc: Add MMC host software queue support 2020-04-08 09:29:46 -07:00
fs ANDROID: fscrypt: fall back to filesystem-layer crypto when needed 2020-04-07 17:59:05 +00:00
include UPSTREAM: mmc: Add MMC host software queue support 2020-04-08 09:29:46 -07:00
init FROMGIT: kbuild: mkcompile_h: Include $LD version in /proc/version 2020-04-08 16:27:24 +00:00
ipc This is the 5.4.23 stable release 2020-03-01 10:17:44 +01:00
kernel This is the 5.4.31 stable release 2020-04-08 13:00:39 +02:00
lib This is the 5.4.31 stable release 2020-04-08 13:00:39 +02:00
LICENSES
mm This is the 5.4.31 stable release 2020-04-08 13:00:39 +02:00
net This is the 5.4.31 stable release 2020-04-08 13:00:39 +02:00
samples FROMGIT: samples/hw_breakpoint: drop use of kallsyms_lookup_name() 2020-03-12 11:15:54 +00:00
scripts FROMGIT: kbuild: mkcompile_h: Include $LD version in /proc/version 2020-04-08 16:27:24 +00:00
security This is the 5.4.25 stable release 2020-03-12 17:09:04 +01:00
sound This is the 5.4.31 stable release 2020-04-08 13:00:39 +02:00
tools This is the 5.4.31 stable release 2020-04-08 13:00:39 +02:00
usr initramfs: restore default compression behavior 2020-04-08 09:08:38 +02:00
virt KVM: Check for a bad hva before dropping into the ghc slow path 2020-03-05 16:43:48 +01:00
.clang-format
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore
.mailmap
abi_gki_aarch64.xml ANDROID: GKI: update ABI for SCHED_AUTOGROUP removal 2020-04-07 16:33:22 -07:00
abi_gki_aarch64_cuttlefish_whitelist ANDROID: GKI: update cf whitelist + gki whitelist 2020-03-31 12:28:54 -07:00
abi_gki_aarch64_db845c_whitelist ANDROID: ABI/Whitelist: update for db845c 2020-03-30 23:58:31 +00:00
abi_gki_aarch64_goldfish_whitelist ANDROID: GKI: Added goldfish whitelist to aarch64 abi 2020-03-31 12:45:07 -07:00
abi_gki_aarch64_hikey960_whitelist ANDROID: ABI/Whitelist: update for hikey960 2020-03-23 23:39:45 +00:00
abi_gki_aarch64_qcom_whitelist ANDROID: GKI: remove kernel_read/write from whitelists 2020-04-02 06:18:20 +00:00
abi_gki_aarch64_unisoc_whitelist ANDROID: GKI: remove kernel_read/write from whitelists 2020-04-02 06:18:20 +00:00
abi_gki_aarch64_whitelist ANDROID: abi_gki_aarch64_whitelist: add module_layout and task_struct 2020-03-04 23:09:20 +00:00
build.config.aarch64
build.config.allmodconfig
build.config.allmodconfig.aarch64
build.config.allmodconfig.arm ANDROID: Add build.config files for ARM 32-bit 2020-03-15 22:51:11 +00:00
build.config.allmodconfig.x86_64
build.config.arm ANDROID: Add build.config files for ARM 32-bit 2020-03-15 22:51:11 +00:00
build.config.common ANDROID: clang: update to 10.0.5 2020-03-30 20:09:25 +00:00
build.config.db845c ANDROID: db845c build: Use merge_configs 2020-04-01 14:04:53 +00:00
build.config.gki
build.config.gki-debug.aarch64 ANDROID: Add build.config.gki-debug.aarch64 2020-03-16 09:20:25 +00:00
build.config.gki-debug.x86_64 ANDROID: Add build.config.gki-debug.x86_64 2020-03-16 14:27:00 +00:00
build.config.gki.aarch64 ANDROID: GKI: Added goldfish whitelist to aarch64 abi 2020-03-31 12:45:07 -07:00
build.config.gki.x86_64
build.config.hikey960 ANDROID: hikey960: Add external mali driver support to build.config.hikey960 2020-03-23 22:55:17 +00:00
build.config.x86_64
COPYING
CREDITS
Kbuild
Kconfig
MAINTAINERS This is the 5.4.23 stable release 2020-03-01 10:17:44 +01:00
Makefile This is the 5.4.31 stable release 2020-04-08 13:00:39 +02:00
README
README.md

README.md

How do I submit patches to Android Common Kernels

  1. BEST: Make all of your changes to upstream Linux. If appropriate, backport to the stable releases. These patches will be merged automatically in the corresponding common kernels. If the patch is already in upstream Linux, post a backport of the patch that conforms to the patch requirements below.

  2. LESS GOOD: Develop your patches out-of-tree (from an upstream Linux point-of-view). Unless these are fixing an Android-specific bug, these are very unlikely to be accepted unless they have been coordinated with kernel-team@android.com. If you want to proceed, post a patch that conforms to the patch requirements below.

Common Kernel patch requirements

  • All patches must conform to the Linux kernel coding standards and pass script/checkpatch.pl
  • Patches shall not break gki_defconfig or allmodconfig builds for arm, arm64, x86, x86_64 architectures (see https://source.android.com/setup/build/building-kernels)
  • If the patch is not merged from an upstream branch, the subject must be tagged with the type of patch: UPSTREAM:, BACKPORT:, FROMGIT:, FROMLIST:, or ANDROID:.
  • All patches must have a Change-Id: tag (see https://gerrit-review.googlesource.com/Documentation/user-changeid.html)
  • If an Android bug has been assigned, there must be a Bug: tag.
  • All patches must have a Signed-off-by: tag by the author and the submitter

Additional requirements are listed below based on patch type

Requirements for backports from mainline Linux: UPSTREAM:, BACKPORT:

  • If the patch is a cherry-pick from Linux mainline with no changes at all
    • tag the patch subject with UPSTREAM:.
    • add upstream commit information with a (cherry-picked from ...) line
    • Example:
      • if the upstream commit message is
        important patch from upstream

        This is the detailed description of the important patch

        Signed-off-by: Fred Jones <fred.jones@foo.org>

    - then Joe Smith would upload the patch for the common kernel as

        UPSTREAM: important patch from upstream

        This is the detailed description of the important patch

        Signed-off-by: Fred Jones <fred.jones@foo.org>

        Bug: 135791357
        Change-Id: I4caaaa566ea080fa148c5e768bb1a0b6f7201c01
        (cherry-picked from c31e73121f4c1ec41143423ac6ce3ce6dafdcec1)
        Signed-off-by: Joe Smith <joe.smith@foo.org>
  • If the patch requires any changes from the upstream version, tag the patch with BACKPORT: instead of UPSTREAM:.
    • use the same tags as UPSTREAM:
    • add comments about the changes under the (cherry-picked from ...) line
    • Example:
        BACKPORT: important patch from upstream

        This is the detailed description of the important patch

        Signed-off-by: Fred Jones <fred.jones@foo.org>

        Bug: 135791357
        Change-Id: I4caaaa566ea080fa148c5e768bb1a0b6f7201c01
        (cherry-picked from c31e73121f4c1ec41143423ac6ce3ce6dafdcec1)
        [ Resolved minor conflict in drivers/foo/bar.c ]
        Signed-off-by: Joe Smith <joe.smith@foo.org>

Requirements for other backports: FROMGIT:, FROMLIST:,

  • If the patch has been merged into an upstream maintainer tree, but has not yet been merged into Linux mainline
    • tag the patch subject with FROMGIT:
    • add info on where the patch came from as (cherry picked from commit <sha1> <repo> <branch>). This must be a stable maintainer branch (not rebased, so don't use linux-next for example).
    • if changes were required, use BACKPORT: FROMGIT:
    • Example:
      • if the commit message in the maintainer tree is
        important patch from upstream

        This is the detailed description of the important patch

        Signed-off-by: Fred Jones <fred.jones@foo.org>

    - then Joe Smith would upload the patch for the common kernel as

        FROMGIT: important patch from upstream

        This is the detailed description of the important patch

        Signed-off-by: Fred Jones <fred.jones@foo.org>

        Bug: 135791357
        (cherry picked from commit 878a2fd9de10b03d11d2f622250285c7e63deace
         https://git.kernel.org/pub/scm/linux/kernel/git/foo/bar.git test-branch)
        Change-Id: I4caaaa566ea080fa148c5e768bb1a0b6f7201c01
        Signed-off-by: Joe Smith <joe.smith@foo.org>
  • If the patch has been submitted to LKML, but not accepted into any maintainer tree
    • tag the patch subject with FROMLIST:
    • add a Link: tag with a link to the submittal on lore.kernel.org
    • if changes were required, use BACKPORT: FROMLIST:
    • Example:
        FROMLIST: important patch from upstream

        This is the detailed description of the important patch

        Signed-off-by: Fred Jones <fred.jones@foo.org>

        Bug: 135791357
        Link: https://lore.kernel.org/lkml/20190619171517.GA17557@someone.com/
        Change-Id: I4caaaa566ea080fa148c5e768bb1a0b6f7201c01
        Signed-off-by: Joe Smith <joe.smith@foo.org>

Requirements for Android-specific patches: ANDROID:

  • If the patch is fixing a bug to Android-specific code
    • tag the patch subject with ANDROID:
    • add a Fixes: tag that cites the patch with the bug
    • Example:
        ANDROID: fix android-specific bug in foobar.c

        This is the detailed description of the important fix

        Fixes: 1234abcd2468 ("foobar: add cool feature")
        Change-Id: I4caaaa566ea080fa148c5e768bb1a0b6f7201c01
        Signed-off-by: Joe Smith <joe.smith@foo.org>
  • If the patch is a new feature
    • tag the patch subject with ANDROID:
    • add a Bug: tag with the Android bug (required for android-specific features)