https://github.com/torvalds/linux
IMC trace-mode uses MSR[HV/PR] bits to set the cpumode for the instruction pointer captured in each sample. The bits are fetched from the third double word of the trace record. Reading third double word from IMC trace record should use be64_to_cpu() along with READ_ONCE inorder to fetch correct MSR[HV/PR] bits. Patch addresses this change. Currently we are using PERF_RECORD_MISC_HYPERVISOR as cpumode if MSR HV is 1 and PR is 0 which means the address is from host counter. But using PERF_RECORD_MISC_HYPERVISOR for host counter data will fail to resolve the address -> symbol during "perf report" because perf tools side uses PERF_RECORD_MISC_KERNEL to represent the host counter data. Therefore, fix the trace imc sample data to use PERF_RECORD_MISC_KERNEL as cpumode for host kernel information. Fixes: 77ca3951cc37 ("powerpc/perf: Add kernel support for new MSR[HV PR] bits in trace-imc") Signed-off-by: Athira Rajeev <atrajeev@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> Link: https://lore.kernel.org/r/1598424029-1662-1-git-send-email-atrajeev@linux.vnet.ibm.com
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powerpc/perf: Fix reading of MSR[HV/PR] bits in trace-imc
File | Mode | Size |
---|---|---|
Makefile | -rw-r--r-- | 361 bytes |
compat.c | -rw-r--r-- | 2.2 KB |
ipc_sysctl.c | -rw-r--r-- | 6.1 KB |
mq_sysctl.c | -rw-r--r-- | 2.7 KB |
mqueue.c | -rw-r--r-- | 43.1 KB |
msg.c | -rw-r--r-- | 31.6 KB |
msgutil.c | -rw-r--r-- | 3.6 KB |
namespace.c | -rw-r--r-- | 5.1 KB |
sem.c | -rw-r--r-- | 62.7 KB |
shm.c | -rw-r--r-- | 43.0 KB |
syscall.c | -rw-r--r-- | 5.1 KB |
util.c | -rw-r--r-- | 22.8 KB |
util.h | -rw-r--r-- | 8.7 KB |
Computing file changes ...