ebd09753b5
This is the commit that porting the perf for nds32. 1.Raw event: The raw events start with 'r'. Usage: perf stat -e rXYZ ./app X: the index of performance counter. YZ: the index(convert to hexdecimal) of events Example: 'perf stat -e r101 ./app' means the counter 1 will count the instruction event. The index of counter and events can be found in "Andes System Privilege Architecture Version 3 Manual". Or you can perform the 'perf list' to find the symbolic name of raw events. 2.Perf mmap2: Fix unexpected perf mmap2() page fault When the mmap2() called by perf application, you will encounter such condition:"failed to write." With return value -EFAULT This is due to the page fault caused by "reading" buffer from the mapped legal address region to write to the descriptor. The page_fault handler will get a VM_FAULT_SIGBUS return value, which should not happens here.(Due to this is a read request.) You can refer to kernel/events/core.c:perf_mmap_fault(...) If "(vmf->pgoff && (vmf->flags & FAULT_FLAG_WRITE))" is evaluated as true, you will get VM_FAULT_SIGBUS as return value. However, this is not an write request. The flags which indicated why the page fault happens is wrong. Furthermore, NDS32 SPAv3 is not able to detect it is read or write. It only know either it is instruction fetch or data access. Therefore, by removing the wrong flag assignment(actually, the hardware is not able to show the reason), we can fix this bug. 3.Perf multiple events map to same counter. When there are multiple events map to the same counter, the counter counts inaccurately. This is because each counter only counts one event in the same time. So when there are multiple events map to same counter, they have to take turns in each context. There are two solution: 1. Print the error message when multiple events map to the same counter. But print the error message would let the program hang in loop. The ltp (linux test program) would be failed when the program hang in loop. 2. Don't print the error message, the ltp would pass. But the user need to have the knowledge that don't count the events which map to the same counter, or the user will get the inaccurate results. We choose method 2 for the solution Signed-off-by: Nickhu <nickhu@andestech.com> Acked-by: Greentime Hu <greentime@andestech.com> Signed-off-by: Greentime Hu <greentime@andestech.com>
96 lines
1.9 KiB
Plaintext
96 lines
1.9 KiB
Plaintext
#
|
|
# For a description of the syntax of this configuration file,
|
|
# see Documentation/kbuild/kconfig-language.txt.
|
|
#
|
|
|
|
config NDS32
|
|
def_bool y
|
|
select ARCH_HAS_SYNC_DMA_FOR_CPU
|
|
select ARCH_HAS_SYNC_DMA_FOR_DEVICE
|
|
select ARCH_WANT_FRAME_POINTERS if FTRACE
|
|
select CLKSRC_MMIO
|
|
select CLONE_BACKWARDS
|
|
select COMMON_CLK
|
|
select DMA_DIRECT_OPS
|
|
select GENERIC_ATOMIC64
|
|
select GENERIC_CPU_DEVICES
|
|
select GENERIC_CLOCKEVENTS
|
|
select GENERIC_IRQ_CHIP
|
|
select GENERIC_IRQ_SHOW
|
|
select GENERIC_LIB_ASHLDI3
|
|
select GENERIC_LIB_ASHRDI3
|
|
select GENERIC_LIB_CMPDI2
|
|
select GENERIC_LIB_LSHRDI3
|
|
select GENERIC_LIB_MULDI3
|
|
select GENERIC_LIB_UCMPDI2
|
|
select GENERIC_STRNCPY_FROM_USER
|
|
select GENERIC_STRNLEN_USER
|
|
select GENERIC_TIME_VSYSCALL
|
|
select HANDLE_DOMAIN_IRQ
|
|
select HAVE_ARCH_TRACEHOOK
|
|
select HAVE_DEBUG_KMEMLEAK
|
|
select HAVE_REGS_AND_STACK_ACCESS_API
|
|
select HAVE_PERF_EVENTS
|
|
select IRQ_DOMAIN
|
|
select LOCKDEP_SUPPORT
|
|
select MODULES_USE_ELF_RELA
|
|
select OF
|
|
select OF_EARLY_FLATTREE
|
|
select NO_IOPORT_MAP
|
|
select RTC_LIB
|
|
select THREAD_INFO_IN_TASK
|
|
select HAVE_FUNCTION_TRACER
|
|
select HAVE_FUNCTION_GRAPH_TRACER
|
|
select HAVE_FTRACE_MCOUNT_RECORD
|
|
select HAVE_DYNAMIC_FTRACE
|
|
help
|
|
Andes(nds32) Linux support.
|
|
|
|
config GENERIC_CALIBRATE_DELAY
|
|
def_bool y
|
|
|
|
config GENERIC_CSUM
|
|
def_bool y
|
|
|
|
config GENERIC_HWEIGHT
|
|
def_bool y
|
|
|
|
config GENERIC_LOCKBREAK
|
|
def_bool y
|
|
depends on PREEMPT
|
|
|
|
config RWSEM_GENERIC_SPINLOCK
|
|
def_bool y
|
|
|
|
config TRACE_IRQFLAGS_SUPPORT
|
|
def_bool y
|
|
|
|
config STACKTRACE_SUPPORT
|
|
def_bool y
|
|
|
|
config FIX_EARLYCON_MEM
|
|
def_bool y
|
|
|
|
config PGTABLE_LEVELS
|
|
default 2
|
|
|
|
menu "System Type"
|
|
source "arch/nds32/Kconfig.cpu"
|
|
config NR_CPUS
|
|
int
|
|
default 1
|
|
|
|
config MMU
|
|
def_bool y
|
|
|
|
config NDS32_BUILTIN_DTB
|
|
string "Builtin DTB"
|
|
default ""
|
|
help
|
|
User can use it to specify the dts of the SoC
|
|
endmenu
|
|
|
|
menu "Kernel Features"
|
|
source "kernel/Kconfig.hz"
|
|
endmenu
|