linux-dev/arch/csky/kernel/perf_event.c, branch linus/master

csky: Add VDSO with GENERIC_GETTIMEOFDAY, GENERIC_TIME_VSYSCALL, HAVE_GENERIC_VDSO

2021-02-27T08:35:09Z

It could help to reduce the latency of the time-related functions in user space. We have referenced arm's and riscv's implementation for the patch. Signed-off-by: Guo Ren Cc: Vincent Chen Cc: Arnd Bergmann

csky: Fixup perf probe failed

2021-01-12T01:52:40Z

Current perf init will failed with: [ 1.452433] csky-pmu: probe of soc:pmu failed with error -16 This patch fix it up with adding CPUHP_AP_PERF_CSKY_ONLINE in cpuhotplug.h. Signed-off-by: Guo Ren Cc: Peter Zijlstra Cc: Ingo Molnar Cc: Arnaldo Carvalho de Melo

csky: Move static keyword to the front of declaration

2019-09-30T03:50:49Z

Move the static keyword to the front of declaration of csky_pmu_of_device_ids, and resolve the following compiler warning that can be seen when building with warnings enabled (W=1): arch/csky/kernel/perf_event.c:1340:1: warning: ‘static’ is not at beginning of declaration [-Wold-style-declaration] Signed-off-by: Krzysztof Wilczynski Signed-off-by: Guo Ren

csky: Fixup csky_pmu.max_period assignment

2019-09-30T02:26:33Z

The csky_pmu.max_period has type u64, and BIT() can only return 32 bits unsigned long on C-SKY. The initialization for max_period will be incorrect when count_width is bigger than 32. Use BIT_ULL() Signed-off-by: Mao Han Signed-off-by: Guo Ren

csky: Fixup some error count in 810 & 860.

2019-07-19T06:21:36Z

CK810 pmu only support event with index 0-8 and 0xd; CK860 only support event 1~4, 0xa~0x1b. So do not register unsupport event to hardware cache event, which may leader to unknown behavior. Signed-off-by: Mao Han Signed-off-by: Guo Ren

csky: Fix perf record in kernel/user space

2019-07-19T06:21:36Z

csky_pmu_event_init is called several times during the perf record initialzation. After configure the event counter in either kernel space or user space, csky_pmu_event_init is called twice with no attr specified. Configuration will be overwritten with sampling in both kernel space and user space. --all-kernel/--all-user is useless without this patch applied. Signed-off-by: Mao Han Signed-off-by: Guo Ren

csky: Add pmu interrupt support

2019-07-19T06:21:36Z

This patch add interrupt request and handler for csky pmu. perf can record on hardware event with this patch applied. Signed-off-by: Mao Han Signed-off-by: Guo Ren

csky: Add count-width property for csky pmu

2019-07-19T06:21:36Z

The csky pmu counter may have different io width. When the counter is smaller then 64 bits and counter value is smaller than the old value, it will result to a extremely large delta value. So the sampled value should be extend to 64 bits to avoid this, the extension bits base on the count-width property from dts. Signed-off-by: Mao Han Signed-off-by: Guo Ren

csky: Init pmu as a device

2019-07-19T06:21:36Z

This patch change the csky pmu initialization from arch init to device init. The pmu can be configued with information from device tree(pmu device name, irq number and etc.). Signed-off-by: Mao Han Signed-off-by: Guo Ren

csky: Add perf support for C-SKY

2019-01-02T14:17:11Z

This adds basic perf support for all C-SKY CPUs. Hardware events are only supported by 807/810/860. Signed-off-by: Guo Ren