BMC/Intel-BMC/linux.git/drivers/hwtracing, branch dev-4.10

intel_th: Don't leak module refcount on failure to activate

2017-03-30T07:44:09+00:00

commit e609ccef5222c73b46b322be7d3796d60bff353d upstream. Output 'activation' may fail for the reasons of the output driver, for example, if msc's buffer is not allocated. We forget, however, to drop the module reference in this case. So each attempt at activation in this case leaks a reference, preventing the module from ever unloading. This patch adds the missing module_put() in the activation error path. Signed-off-by: Alexander Shishkin Signed-off-by: Greg Kroah-Hartman

coresight: fix kernel panic caused by invalid CPU

2017-03-12T05:44:09+00:00

commit f09444639099584bc4784dfcd85ada67c6f33e0f upstream. Commit d52c9750f150 ("coresight: reset "enable_sink" flag when need be") caused a kernel panic because of the using of an invalid value: after 'for_each_cpu(cpu, mask)', value of local variable 'cpu' become invalid, causes following 'cpu_to_node' access invalid memory area. This patch brings the deleted 'cpu = cpumask_first(mask)' back. Panic log: $ perf record -e cs_etm// ls Unable to handle kernel paging request at virtual address fffe801804af4f10 pgd = ffff8017ce031600 [fffe801804af4f10] *pgd=0000000000000000, *pud=0000000000000000 Internal error: Oops: 96000004 [#1] SMP Modules linked in: CPU: 33 PID: 1619 Comm: perf Not tainted 4.7.1+ #16 Hardware name: Huawei Taishan 2280 /CH05TEVBA, BIOS 1.10 11/24/2016 task: ffff8017cb0c8400 ti: ffff8017cb154000 task.ti: ffff8017cb154000 PC is at tmc_alloc_etf_buffer+0x60/0xd4 LR is at tmc_alloc_etf_buffer+0x44/0xd4 pc : [] lr : [] pstate: 60000145 sp : ffff8017cb157b40 x29: ffff8017cb157b40 x28: 0000000000000000 ...skip... 7a60: ffff000008c64dc8 0000000000000006 0000000000000253 ffffffffffffffff 7a80: 0000000000000000 0000000000000000 ffff0000080872cc 0000000000000001 [] tmc_alloc_etf_buffer+0x60/0xd4 [] etm_setup_aux+0x1dc/0x1e8 [] rb_alloc_aux+0x2b0/0x338 [] perf_mmap+0x414/0x568 [] mmap_region+0x324/0x544 [] do_mmap+0x334/0x3e0 [] vm_mmap_pgoff+0xa4/0xc8 [] SyS_mmap_pgoff+0xb0/0x22c [] sys_mmap+0x18/0x28 [] el0_svc_naked+0x24/0x28 Code: 912040a5 d0001c00 f873d821 911c6000 (b8656822) ---[ end trace 98933da8f92b0c9a ]--- Signed-off-by: Wang Nan Cc: Xia Kaixu Cc: Li Zefan Cc: Mathieu Poirier Cc: linux-arm-kernel@lists.infradead.org Cc: linux-kernel@vger.kernel.org Fixes: d52c9750f150 ("coresight: reset "enable_sink" flag when need be") Signed-off-by: Mathieu Poirier Signed-off-by: Greg Kroah-Hartman

coresight: STM: Balance enable/disable

2017-03-12T05:44:09+00:00

commit 4474f4c40a9c607c7317e686b23619b7b768004f upstream. The stm is automatically enabled when an application sets the policy via ->link() call back by using coresight_enable(), which keeps the refcount of the current users of the STM. However, the unlink() callback issues stm_disable() directly, which leaves the STM turned off, without the coresight layer knowing about it. This prevents any further uses of the STM hardware as the coresight layer still thinks the STM is turned on and doesn't enable the hardware when required. Even manually enabling the STM via sysfs can't really enable the hw. e.g, $ echo 1 > $CS_DEVS/$ETR/enable_sink $ mkdir -p $CONFIG_FS/stp-policy/$source.0/stm_test/ $ echo 32768 65535 > $CONFIG_FS/stp-policy/$source.0/stm_test/channels $ echo 64 > $CS_DEVS/$source/traceid $ ./stm_app Sending 64000 byte blocks of pattern 0 at 0us intervals Success to map channel(32768~32783) to 0xffffa95fa000 Sending on channel 32768 $ dd if=/dev/$ETR of=~/trace.bin.1 597+1 records in 597+1 records out 305920 bytes (306 kB) copied, 0.399952 s, 765 kB/s $ ./stm_app Sending 64000 byte blocks of pattern 0 at 0us intervals Success to map channel(32768~32783) to 0xffff7e9e2000 Sending on channel 32768 $ dd if=/dev/$ETR of=~/trace.bin.2 0+0 records in 0+0 records out 0 bytes (0 B) copied, 0.0232083 s, 0.0 kB/s Note that we don't get any data from the ETR for the second session. Also dmesg shows : [ 77.520458] coresight-tmc 20800000.etr: TMC-ETR enabled [ 77.537097] coresight-replicator etr_replicator@20890000: REPLICATOR enabled [ 77.558828] coresight-replicator main_replicator@208a0000: REPLICATOR enabled [ 77.581068] coresight-funnel 208c0000.main_funnel: FUNNEL inport 0 enabled [ 77.602217] coresight-tmc 20840000.etf: TMC-ETF enabled [ 77.618422] coresight-stm 20860000.stm: STM tracing enabled [ 139.554252] coresight-stm 20860000.stm: STM tracing disabled # End of first tracing session [ 146.351135] coresight-tmc 20800000.etr: TMC read start [ 146.514486] coresight-tmc 20800000.etr: TMC read end # Note that the STM is not turned on via stm_generic_link()->coresight_enable() # and hence none of the components are turned on. [ 152.479080] coresight-tmc 20800000.etr: TMC read start [ 152.542632] coresight-tmc 20800000.etr: TMC read end This patch fixes the problem by balancing the unlink operation by using the coresight_disable(), keeping the coresight layer in sync with the hardware state and thus allowing normal usage of the STM component. Fixes: commit 237483aa5cf43 ("coresight: stm: adding driver for CoreSight STM component") Cc: Pratik Patel Cc: Greg Kroah-Hartman Acked-by: Mathieu Poirier Reviewed-by: Chunyan Zhang Reported-by: Robert Walker Signed-off-by: Suzuki K Poulose Signed-off-by: Greg Kroah-Hartman

coresight/etm3/4x: Consolidate hotplug state space

2016-12-25T09:47:44+00:00

Even if both drivers are compiled in only one instance can run on a given system depending on the available tracer cell. So having seperate hotplug states for them is pointless. Signed-off-by: Thomas Gleixner Cc: Peter Zijlstra Cc: Sebastian Siewior Cc: Mathieu Poirier Link: http://lkml.kernel.org/r/20161221192112.162765484@linutronix.de Signed-off-by: Thomas Gleixner

cpu/hotplug: Cleanup state names

2016-12-25T09:47:44+00:00

When the state names got added a script was used to add the extra argument to the calls. The script basically converted the state constant to a string, but the cleanup to convert these strings into meaningful ones did not happen. Replace all the useless strings with 'subsys/xxx/yyy:state' strings which are used in all the other places already. Signed-off-by: Thomas Gleixner Cc: Peter Zijlstra Cc: Sebastian Siewior Link: http://lkml.kernel.org/r/20161221192112.085444152@linutronix.de Signed-off-by: Thomas Gleixner

Merge tag 'trace-v4.10' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace

2016-12-15T21:49:34+00:00

Pull tracing updates from Steven Rostedt: "This release has a few updates: - STM can hook into the function tracer - Function filtering now supports more advance glob matching - Ftrace selftests updates and added tests - Softirq tag in traces now show only softirqs - ARM nop added to non traced locations at compile time - New trace_marker_raw file that allows for binary input - Optimizations to the ring buffer - Removal of kmap in trace_marker - Wakeup and irqsoff tracers now adhere to the set_graph_notrace file - Other various fixes and clean ups" * tag 'trace-v4.10' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace: (42 commits) selftests: ftrace: Shift down default message verbosity kprobes/trace: Fix kprobe selftest for newer gcc tracing/kprobes: Add a helper method to return number of probe hits tracing/rb: Init the CPU mask on allocation tracing: Use SOFTIRQ_OFFSET for softirq dectection for more accurate results tracing/fgraph: Have wakeup and irqsoff tracers ignore graph functions too fgraph: Handle a case where a tracer ignores set_graph_notrace tracing: Replace kmap with copy_from_user() in trace_marker writing ftrace/x86_32: Set ftrace_stub to weak to prevent gcc from using short jumps to it tracing: Allow benchmark to be enabled at early_initcall() tracing: Have system enable return error if one of the events fail tracing: Do not start benchmark on boot up tracing: Have the reg function allow to fail ring-buffer: Force rb_end_commit() and rb_set_commit_to_write() inline ring-buffer: Froce rb_update_write_stamp() to be inlined ring-buffer: Force inline of hotpath helper functions tracing: Make __buffer_unlock_commit() always_inline tracing: Make tracepoint_printk a static_key ring-buffer: Always inline rb_event_data() ring-buffer: Make rb_reserve_next_event() always inlined ...

coresight: perf: Add a missing call to etm_free_aux

2016-11-29T19:05:32+00:00

Most error branches following the call to alloc_event_data contain a call to etm_free_aux. This patch add a call to etm_free_aux to an error branch that does not call it. This issue was found with Hector. Signed-off-by: Quentin Lambert Signed-off-by: Mathieu Poirier Signed-off-by: Greg Kroah-Hartman

coresight: Add support for ARM Coresight STM-500

2016-11-29T19:05:32+00:00

Add the PIDs for STM-500 to the known STM devices list. Cc: Mathieu Poirier Cc: Chunyan Zhang Signed-off-by: Suzuki K Poulose Signed-off-by: Mathieu Poirier Signed-off-by: Greg Kroah-Hartman

coresight: tmc: Remove duplicate memset

2016-11-29T19:05:32+00:00

The tmc_etr_enable_hw() fills the buffer with 0's before enabling the hardware. So, we don't need an explicit memset() in tmc_enable_etr_sink_sysfs() before calling the tmc_etr_enable_hw(). This patch removes the explicit memset from tmc_enable_etr_sink_sysfs. Signed-off-by: Suzuki K Poulose Signed-off-by: Mathieu Poirier Signed-off-by: Greg Kroah-Hartman

coresight: tmc: Get rid of mode parameter for helper routines

2016-11-29T19:05:32+00:00

Get rid of the superfluous mode parameter and the check for the mode in tmc_etX_enable_sink_{perf/sysfs}. While at it, also remove the unnecessary WARN_ON() checks. Cc: Mathieu Poirier Signed-off-by: Suzuki K Poulose Signed-off-by: Mathieu Poirier Signed-off-by: Greg Kroah-Hartman