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2016-01-04xen/blkback: make pool of persistent grants and free pages per-queueBob Liu
Make pool of persistent grants and free pages per-queue/ring instead of per-device to get better scalability. Test was done based on null_blk driver: dom0: v4.2-rc8 16vcpus 10GB "modprobe null_blk" domu: v4.2-rc8 16vcpus 10GB [test] rw=read direct=1 ioengine=libaio bs=4k time_based runtime=30 filename=/dev/xvdb numjobs=16 iodepth=64 iodepth_batch=64 iodepth_batch_complete=64 group_reporting Results: iops1: After patch "xen/blkfront: make persistent grants per-queue". iops2: After this patch. Queues: 1 4 8 16 Iops orig(k): 810 1064 780 700 Iops1(k): 810 1230(~20%) 1024(~20%) 850(~20%) Iops2(k): 810 1410(~35%) 1354(~75%) 1440(~100%) With 4 queues after this commit we can get ~75% increase in IOPS, and performance won't drop if increasing queue numbers. Please find the respective chart in this link: https://www.dropbox.com/s/agrcy2pbzbsvmwv/iops.png?dl=0 Signed-off-by: Bob Liu <bob.liu@oracle.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2016-01-04xen/blkback: get the number of hardware queues/rings from blkfrontBob Liu
Backend advertises "multi-queue-max-queues" to front, also get the negotiated number from "multi-queue-num-queues" written by blkfront. Signed-off-by: Bob Liu <bob.liu@oracle.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2016-01-04xen/blkback: pseudo support for multi hardware queues/ringsKonrad Rzeszutek Wilk
Preparatory patch for multiple hardware queues (rings). The number of rings is unconditionally set to 1, larger number will be enabled in "xen/blkback: get the number of hardware queues/rings from blkfront". Signed-off-by: Arianna Avanzini <avanzini.arianna@gmail.com> Signed-off-by: Bob Liu <bob.liu@oracle.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> --- v2: Align variables in the structures.
2016-01-04xen/blkback: separate ring information out of struct xen_blkifBob Liu
Split per ring information to an new structure "xen_blkif_ring", so that one vbd device can be associated with one or more rings/hardware queues. Introduce 'pers_gnts_lock' to protect the pool of persistent grants since we may have multi backend threads. This patch is a preparation for supporting multi hardware queues/rings. Signed-off-by: Arianna Avanzini <avanzini.arianna@gmail.com> Signed-off-by: Bob Liu <bob.liu@oracle.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> --- v2: Align the variables in the structure.
2016-01-04xen/blkfront: correct setting for xen_blkif_max_ring_orderPeng Fan
According to this piece code: " pr_info("Invalid max_ring_order (%d), will use default max: %d.\n", xen_blkif_max_ring_order, XENBUS_MAX_RING_GRANT_ORDER); " if xen_blkif_max_ring_order is bigger that XENBUS_MAX_RING_GRANT_ORDER, need to set xen_blkif_max_ring_order using XENBUS_MAX_RING_GRANT_ORDER, but not 0. Signed-off-by: Peng Fan <van.freenix@gmail.com> Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com> Cc: David Vrabel <david.vrabel@citrix.com> Cc: "Roger Pau Monné" <roger.pau@citrix.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2016-01-04xen/blkfront: make persistent grants pool per-queueBob Liu
Make persistent grants per-queue/ring instead of per-device, so that we can drop the 'dev_lock' and get better scalability. Test was done based on null_blk driver: dom0: v4.2-rc8 16vcpus 10GB "modprobe null_blk" domu: v4.2-rc8 16vcpus 10GB [test] rw=read direct=1 ioengine=libaio bs=4k time_based runtime=30 filename=/dev/xvdb numjobs=16 iodepth=64 iodepth_batch=64 iodepth_batch_complete=64 group_reporting Queues: 1 4 8 16 Iops orig(k): 810 1064 780 700 Iops patched(k): 810 1230(~20%) 1024(~20%) 850(~20%) Signed-off-by: Bob Liu <bob.liu@oracle.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2016-01-04xen/blkfront: Remove duplicate setting of ->xbdev.Bob Liu
We do the same exact operations a bit earlier in the function. Signed-off-by: Bob Liu <bob.liu@oracle.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2016-01-04xen/blkfront: Cleanup of comments, fix unaligned variables, and syntax errors.Konrad Rzeszutek Wilk
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2016-01-04xen/blkfront: negotiate number of queues/rings to be used with backendBob Liu
The max number of hardware queues for xen/blkfront is set by parameter 'max_queues'(default 4), while it is also capped by the max value that the xen/blkback exposes through XenStore key 'multi-queue-max-queues'. The negotiated number is the smaller one and would be written back to xenstore as "multi-queue-num-queues", blkback needs to read this negotiated number. Signed-off-by: Bob Liu <bob.liu@oracle.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2016-01-04xen/blkfront: split per device io_lockBob Liu
After patch "xen/blkfront: separate per ring information out of device info", per-ring data is protected by a per-device lock ('io_lock'). This is not a good way and will effect the scalability, so introduce a per-ring lock ('ring_lock'). The old 'io_lock' is renamed to 'dev_lock' which protects the ->grants list and ->persistent_gnts_c which are shared by all rings. Note that in 'blkfront_probe' the 'blkfront_info' is setup via kzalloc so setting ->persistent_gnts_c to zero is not needed. Signed-off-by: Bob Liu <bob.liu@oracle.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2016-01-04xen/blkfront: pseudo support for multi hardware queues/ringsBob Liu
Preparatory patch for multiple hardware queues (rings). The number of rings is unconditionally set to 1, larger number will be enabled in patch "xen/blkfront: negotiate number of queues/rings to be used with backend" so as to make review easier. Note that blkfront_gather_backend_features does not call blkfront_setup_indirect anymore (as that needs to be done per ring). That means that in blkif_recover/blkif_connect we have to do it in a loop (bounded by nr_rings). Signed-off-by: Bob Liu <bob.liu@oracle.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2016-01-04drm/dp/mst: fix in RAD element accessMykola Lysenko
This is needed to receive correct port number from RAD, so MSTB could be found Acked-by: Dave Airlie <airlied@gmail.com> Signed-off-by: Mykola Lysenko <Mykola.Lysenko@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> Cc: stable@vger.kernel.org
2016-01-04drm/dp/mst: fix in MSTB RAD initializationMykola Lysenko
This fix is needed to support more then two branch displays, so RAD address consist at least of 2 elements Acked-by: Dave Airlie <airlied@gmail.com> Signed-off-by: Mykola Lysenko <Mykola.Lysenko@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> Cc: stable@vger.kernel.org
2016-01-04drm/dp/mst: always send reply for UP requestMykola Lysenko
We should always send reply for UP request in order to make downstream device clean-up resources appropriately. Issue was that reply for UP request was sent only once. Acked-by: Dave Airlie <airlied@gmail.com> Signed-off-by: Mykola Lysenko <Mykola.Lysenko@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> Cc: stable@vger.kernel.org
2016-01-04drm/dp/mst: process broadcast messages correctlyMykola Lysenko
In case broadcast message received in UP request, RAD cannot be used to identify message originator. Message should be parsed, originator should be found by GUID from parsed message. Also reply with broadcast in case broadcast message received (for now it is always broadcast) Acked-by: Dave Airlie <airlied@gmail.com> Signed-off-by: Mykola Lysenko <Mykola.Lysenko@amd.com> Signed-off-by: Alex Deucher <alexander.deucher@amd.com> Cc: stable@vger.kernel.org
2016-01-04hwmon: (ibmaem) constify aem_rw_sensor_template and aem_ro_sensor_template ↵Julia Lawall
structures The aem_rw_sensor_template and aem_ro_sensor_template structures are never modified, so declare them as const. Done with the help of Coccinelle. Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr> Signed-off-by: Guenter Roeck <linux@roeck-us.net>
2016-01-04netfilter: nf_ct_helper: define pr_fmt()Pablo Neira Ayuso
Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2016-01-04netfilter: nf_tables: add forward expression to the netdev familyPablo Neira Ayuso
You can use this to forward packets from ingress to the egress path of the specified interface. This provides a fast path to bounce packets from one interface to another specific destination interface. Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
2016-01-04ARM: 8481/2: drivers: psci: replace psci firmware callsJens Wiklander
Switch to use a generic interface for issuing SMC/HVC based on ARM SMC Calling Convention. Removes now the now unused psci-call.S. Acked-by: Will Deacon <will.deacon@arm.com> Reviewed-by: Mark Rutland <mark.rutland@arm.com> Tested-by: Mark Rutland <mark.rutland@arm.com> Acked-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Tested-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2016-01-04ARM: 8480/2: arm64: add implementation for arm-smcccJens Wiklander
Adds implementation for arm-smccc and enables CONFIG_HAVE_SMCCC. Acked-by: Will Deacon <will.deacon@arm.com> Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2016-01-04ARM: 8479/2: add implementation for arm-smcccJens Wiklander
Adds implementation for arm-smccc and enables CONFIG_HAVE_SMCCC for architectures that may support arm-smccc. It's the responsibility of the caller to know if the SMC instruction is supported by the platform. Reviewed-by: Lars Persson <lars.persson@axis.com> Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2016-01-04ARM: 8478/2: arm/arm64: add arm-smcccJens Wiklander
Adds helpers to do SMC and HVC based on ARM SMC Calling Convention. CONFIG_HAVE_ARM_SMCCC is enabled for architectures that may support the SMC or HVC instruction. It's the responsibility of the caller to know if the SMC instruction is supported by the platform. This patch doesn't provide an implementation of the declared functions. Later patches will bring in implementations and set CONFIG_HAVE_ARM_SMCCC for ARM and ARM64 respectively. Reviewed-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> Signed-off-by: Jens Wiklander <jens.wiklander@linaro.org> Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
2016-01-04ftrace/scripts: Fix incorrect use of sprintf in recordmcountColin Ian King
Fix build warning: scripts/recordmcount.c:589:4: warning: format not a string literal and no format arguments [-Wformat-security] sprintf("%s: failed\n", file); Fixes: a50bd43935586 ("ftrace/scripts: Have recordmcount copy the object file") Link: http://lkml.kernel.org/r/1451516801-16951-1-git-send-email-colin.king@canonical.com Cc: Li Bin <huawei.libin@huawei.com> Cc: Russell King <rmk+kernel@arm.linux.org.uk> Cc: Will Deacon <will.deacon@arm.com> Cc: stable@vger.kernel.org # 2.6.37+ Signed-off-by: Colin Ian King <colin.king@canonical.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
2016-01-04drm: powerplay: use div64_s64 instead of do_divArnd Bergmann
The newly added code for Fiji creates a correct compiler warning about invalid use of the do_div macro: In file included from powerplay/hwmgr/ppatomctrl.c:31:0: drivers/gpu/drm/amd/amdgpu/../powerplay/hwmgr/ppevvmath.h: In function 'fDivide': drivers/gpu/drm/amd/amdgpu/../powerplay/hwmgr/ppevvmath.h:382:89: warning: comparison of distinct pointer types lacks a cast do_div(longlongX, longlongY); /*Q(32,32) divided by Q(16,16) = Q(16,16) Back to original format */ do_div() divides an unsigned 64-bit number by an unsigned 32-bit number. The code instead wants to divide two signed 64-bit numbers, which is done using the div64_s64 function. Reviewed-by: Thierry Reding <treding@nvidia.com> Reviewed-by: Christian König <christian.koenig@amd.com> Signed-off-by: Arnd Bergmann <arnd@arndb.de> Fixes: 770911a3cfbb ("drm/amd/powerplay: add/update headers for Fiji SMU and DPM") Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
2016-01-04[um] mconsole: don't open-code memdup_user_nul()Al Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2016-01-04[um] hostaudio: don't open-code memdup_user()Al Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2016-01-04HFS wants 8Kb per-superblock allocation; just use kmalloc()Al Viro
... rather than play with __get_free_pages() (and figuring out the allocation order, etc.) Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2016-01-04jfs: microoptimize get_zeroed_page / virt_to_pageAl Viro
get_zeroed_page does alloc_page and returns page_address of the result; subsequent virt_to_page will recover the page, but since the caller needs both page and its page_address() anyway, why bother going through that wrapper at all? Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2016-01-04... and a couple in net/9pAl Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2016-01-04md: more open-coded offset_in_page()Al Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2016-01-04dm-bufio: virt_to_phys() doesn't change remainder modulo PAGE_SIZEAl Viro
... so virt_to_phys(p) & (PAGE_SIZE - 1) is a very odd way to spell offset_in_page(p). Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2016-01-04hpfs: missing endianness annotationAl Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2016-01-04drivers/mtd/maps/pcmciamtd.c: __iomem annotationsAl Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2016-01-04don't carry MAY_OPEN in op->acc_modeAl Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2016-01-04saner calling conventions for copy_mount_options()Al Viro
let it just return NULL, pointer to kernel copy or ERR_PTR(). Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2016-01-04fix the leak in integrity_read_file()Al Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2016-01-04ppc: get rid of the remnants of __get_user64()Al Viro
When __get_user64() had been removed, its helper (__get_user64_nocheck) got missed. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2016-01-04put the remnants of ..._user_ret() to restAl Viro
they hadn't been used in last 15 years... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2016-01-04proc_pid_attr_write(): switch to memdup_user()Al Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2016-01-04kernel/*: switch to memdup_user_nul()Al Viro
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2016-01-04cciss: switch to memdup_user_nul()Al Viro
all we do to buffer is strncmp()... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2016-01-04switch wireless debugfs ->write() instances to memdup_user_nul()Al Viro
again, it only parses the contents of the copied buffer, so get_zeroed_page() might as well had been kmalloc(), which makes it open-coded memdup_user_nul() Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2016-01-04selinuxfs: switch to memdup_user_nul()Al Viro
Nothing in there gives a damn about the buffer alignment - it just parses its contents. So the use of get_zeroed_page() doesn't buy us anything - might as well had been kmalloc(), which makes that code equivalent to open-coded memdup_user_nul() Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2016-01-04convert a bunch of open-coded instances of memdup_user_nul()Al Viro
A _lot_ of ->write() instances were open-coding it; some are converted to memdup_user_nul(), a lot more remain... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2016-01-04Merge branch 'memdup_user_nul' into work.miscAl Viro
2016-01-04new helper: memdup_user_nul()Al Viro
Similar to memdup_user(), except that allocated buffer is one byte longer and '\0' is stored after the copied data. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
2016-01-04udf: Check output buffer length when converting name to CS0Andrew Gabbasov
If a name contains at least some characters with Unicode values exceeding single byte, the CS0 output should have 2 bytes per character. And if other input characters have single byte Unicode values, then the single input byte is converted to 2 output bytes, and the length of output becomes larger than the length of input. And if the input name is long enough, the output length may exceed the allocated buffer length. All this means that conversion from UTF8 or NLS to CS0 requires checking of output length in order to stop when it exceeds the given output buffer size. [JK: Make code return -ENAMETOOLONG instead of silently truncating the name] CC: stable@vger.kernel.org Signed-off-by: Andrew Gabbasov <andrew_gabbasov@mentor.com> Signed-off-by: Jan Kara <jack@suse.cz>
2016-01-04xen/blkfront: separate per ring information out of device infoBob Liu
Split per ring information to a new structure "blkfront_ring_info". A ring is the representation of a hardware queue, every vbd device can associate with one or more rings depending on how many hardware queues/rings to be used. This patch is a preparation for supporting real multi hardware queues/rings. We also add a backpointer to 'struct blkfront_info' (dev_info) which is not needed (we could use containers_of) but further patch ("xen/blkfront: pseudo support for multi hardware queues/rings") will make allocation of 'blkfront_ring_info' dynamic. Signed-off-by: Arianna Avanzini <avanzini.arianna@gmail.com> Signed-off-by: Bob Liu <bob.liu@oracle.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2016-01-04xen/blkif: document blkif multi-queue/ring extensionBob Liu
Document the multi-queue/ring feature in terms of XenStore keys to be written by the backend and by the frontend. Signed-off-by: Bob Liu <bob.liu@oracle.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
2016-01-04udf: Prevent buffer overrun with multi-byte charactersAndrew Gabbasov
udf_CS0toUTF8 function stops the conversion when the output buffer length reaches UDF_NAME_LEN-2, which is correct maximum name length, but, when checking, it leaves the space for a single byte only, while multi-bytes output characters can take more space, causing buffer overflow. Similar error exists in udf_CS0toNLS function, that restricts the output length to UDF_NAME_LEN, while actual maximum allowed length is UDF_NAME_LEN-2. In these cases the output can override not only the current buffer length field, causing corruption of the name buffer itself, but also following allocation structures, causing kernel crash. Adjust the output length checks in both functions to prevent buffer overruns in case of multi-bytes UTF8 or NLS characters. CC: stable@vger.kernel.org Signed-off-by: Andrew Gabbasov <andrew_gabbasov@mentor.com> Signed-off-by: Jan Kara <jack@suse.cz>
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