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opnsense-src/sys/dev/hwpmc
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Andrew Turner 7bc7e3cd65 Don't panic in hwpmc when stopping sampling. 
When hwpmc stops sampling it will set the pm_state to something other
than PMC_STATE_RUNNING. This means the following sequence can happen:

CPU 0: Enter the interrupt handler
CPU 0: Set the thread TDP_CALLCHAIN pflag
CPU 1: Stop sampling
CPU 0: Call pmc_process_samples, sampling is stopped so clears ps_nsamples
CPU 0: Finishes interrupt processing with the TDP_CALLCHAIN flag set
CPU 0: Call pmc_capture_user_callchain to capture the user call chain
CPU 0: Find all the pmc sample are free so no call chains need to be captured
CPU 0: KASSERT because of this

This fixes the issue by checking if any of the samples have been stopped
and including this in te KASSERT.

PR:		204273
Reviewed by:	bz, gnn
Obtained from:	ABT Systems Ltd
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D6581
2016-05-28 13:05:39 +00:00
..
hwpmc_amd.c sys: use our nitems() macro when param.h is available. 2016-04-21 19:40:10 +00:00
hwpmc_amd.h
hwpmc_arm.c Rather than defining our own magic checks here use INKERNEL() for 2015-03-27 08:47:16 +00:00
hwpmc_arm64.c Add Performance Monitoring Counters support for AArch64. 2015-05-19 15:25:47 +00:00
hwpmc_arm64.h Add Performance Monitoring Counters support for AArch64. 2015-05-19 15:25:47 +00:00
hwpmc_arm64_md.c Add Performance Monitoring Counters support for AArch64. 2015-05-19 15:25:47 +00:00
hwpmc_armv7.c o Rework ARMv7 events list using aliases - same way as we have for arm64. 2015-06-10 12:42:30 +00:00
hwpmc_armv7.h o Rework ARMv7 events list using aliases - same way as we have for arm64. 2015-06-10 12:42:30 +00:00
hwpmc_core.c Remove slightly used const values that can be replaced with nitems(). 2016-04-21 15:38:28 +00:00
hwpmc_core.h sys/dev: minor spelling fixes. 2016-05-03 03:41:25 +00:00
hwpmc_e500.c Remove unused e500_event_codes_size. 2016-04-20 20:37:58 +00:00
hwpmc_intel.c Add support for Intel Skylake and Intel Broadwell PMC's. The Broadwell PMC's have been 2015-11-30 17:35:49 +00:00
hwpmc_logging.c Fix the tunable in logging so that if its pre-11 we have the proper 2015-12-09 22:46:40 +00:00
hwpmc_mips.c Cleanup unnecessary semicolons from the kernel. 2016-04-10 23:07:00 +00:00
hwpmc_mips24k.c sys: use our nitems() macro when param.h is available. 2016-04-21 19:40:10 +00:00
hwpmc_mips74k.c sys: use our nitems() macro when param.h is available. 2016-04-21 19:40:10 +00:00
hwpmc_mod.c Don't panic in hwpmc when stopping sampling. 2016-05-28 13:05:39 +00:00
hwpmc_mpc7xxx.c Remove slightly used const values that can be replaced with nitems(). 2016-04-21 15:38:28 +00:00
hwpmc_octeon.c sys: use our nitems() macro when param.h is available. 2016-04-21 19:40:10 +00:00
hwpmc_pentium.c
hwpmc_pentium.h
hwpmc_piv.c Remove misc NULL checks after M_WAITOK allocations. 2016-05-10 10:26:07 +00:00
hwpmc_piv.h Fix undefined behavior: (1 << 31) is not defined as 1 is an int and this 2013-11-30 22:17:27 +00:00
hwpmc_powerpc.c e5500 HWPMC is identical to e500mc, so add support check for it. 2016-01-17 00:14:22 +00:00
hwpmc_powerpc.h Implement hwpmc(4) for Freescale e500 core. 2015-04-18 21:39:17 +00:00
hwpmc_ppc970.c Convert hwpmc(4) debug printfs over to KTR. 2015-05-08 19:40:00 +00:00
hwpmc_ppro.c Convert hwpmc(4) debug printfs over to KTR. 2015-05-08 19:40:00 +00:00
hwpmc_ppro.h
hwpmc_riscv.h Welcome the RISC-V 64-bit kernel. 2016-01-29 15:12:31 +00:00
hwpmc_soft.c Convert hwpmc(4) debug printfs over to KTR. 2015-05-08 19:40:00 +00:00
hwpmc_soft.h Add software PMC support. 2012-03-28 20:58:30 +00:00
hwpmc_sparc64.c
hwpmc_tsc.c Convert hwpmc(4) debug printfs over to KTR. 2015-05-08 19:40:00 +00:00
hwpmc_tsc.h
hwpmc_uncore.c Remove slightly used const values that can be replaced with nitems(). 2016-04-21 15:38:28 +00:00
hwpmc_uncore.h Remove some prototypes for undefined functions. 2014-05-15 21:19:13 +00:00
hwpmc_x86.c Update the hwpmc driver to have the new type HASWELL_XEON. Also 2015-01-14 12:46:58 +00:00
hwpmc_xscale.c Remove slightly used const values that can be replaced with nitems(). 2016-04-21 15:38:28 +00:00
hwpmc_xscale.h Intel XScale hwpmc(4) support. 2009-12-23 23:16:54 +00:00
pmc_events.h sys/dev: minor spelling fixes. 2016-05-03 03:41:25 +00:00