From 068294a1cac4798e4554d9c9848c7c1b31d28713 Mon Sep 17 00:00:00 2001 From: Janosch Frank Date: Mon, 11 Jan 2016 16:17:55 +0100 Subject: [PATCH] scripts/kvm/kvm_stat: Group arch specific data Using global variables and multiple initialization functions for arch specific data makes the code hard to read. By grouping them in the Arch classes we encapsulate and initialize them in one place. Signed-off-by: Janosch Frank Message-Id: <1452525484-32309-26-git-send-email-frankja@linux.vnet.ibm.com> Signed-off-by: Paolo Bonzini --- scripts/kvm/kvm_stat | 125 +++++++++++++++++++++++-------------------- 1 file changed, 67 insertions(+), 58 deletions(-) diff --git a/scripts/kvm/kvm_stat b/scripts/kvm/kvm_stat index bf948b9cc0..42d35f5d95 100755 --- a/scripts/kvm/kvm_stat +++ b/scripts/kvm/kvm_stat @@ -213,62 +213,72 @@ X86_EXIT_REASONS = { 'svm': SVM_EXIT_REASONS, } -SC_PERF_EVT_OPEN = None -EXIT_REASONS = None - IOCTL_NUMBERS = { - 'SET_FILTER' : 0x40082406, - 'ENABLE' : 0x00002400, - 'DISABLE' : 0x00002401, - 'RESET' : 0x00002403, + 'SET_FILTER': 0x40082406, + 'ENABLE': 0x00002400, + 'DISABLE': 0x00002401, + 'RESET': 0x00002403, } -def x86_init(flag): - global SC_PERF_EVT_OPEN - global EXIT_REASONS - - SC_PERF_EVT_OPEN = 298 - EXIT_REASONS = X86_EXIT_REASONS[flag] - -def s390_init(): - global SC_PERF_EVT_OPEN - - SC_PERF_EVT_OPEN = 331 - -def ppc_init(): - global SC_PERF_EVT_OPEN - global IOCTL_NUMBERS - - SC_PERF_EVT_OPEN = 319 +class Arch(object): + """Class that encapsulates global architecture specific data like + syscall and ioctl numbers. - IOCTL_NUMBERS['ENABLE'] = 0x20002400 - IOCTL_NUMBERS['DISABLE'] = 0x20002401 - IOCTL_NUMBERS['SET_FILTER'] = 0x80002406 | (ctypes.sizeof(ctypes.c_char_p) - << 16) + """ + @staticmethod + def get_arch(): + machine = os.uname()[4] + + if machine.startswith('ppc'): + return ArchPPC() + elif machine.startswith('aarch64'): + return ArchA64() + elif machine.startswith('s390'): + return ArchS390() + else: + # X86_64 + for line in open('/proc/cpuinfo'): + if not line.startswith('flags'): + continue + + flags = line.split() + if 'vmx' in flags: + return ArchX86(VMX_EXIT_REASONS) + if 'svm' in flags: + return ArchX86(SVM_EXIT_REASONS) + return + +class ArchX86(Arch): + def __init__(self, exit_reasons): + self.sc_perf_evt_open = 298 + self.ioctl_numbers = IOCTL_NUMBERS + self.exit_reasons = exit_reasons + +class ArchPPC(Arch): + def __init__(self): + self.sc_perf_evt_open = 319 + self.ioctl_numbers = IOCTL_NUMBERS + self.ioctl_numbers['ENABLE'] = 0x20002400 + self.ioctl_numbers['DISABLE'] = 0x20002401 -def aarch64_init(): - global SC_PERF_EVT_OPEN - global EXIT_REASONS + # PPC comes in 32 and 64 bit and some generated ioctl + # numbers depend on the wordsize. + char_ptr_size = ctypes.sizeof(ctypes.c_char_p) + self.ioctl_numbers['SET_FILTER'] = 0x80002406 | char_ptr_size << 16 - SC_PERF_EVT_OPEN = 241 - EXIT_REASONS = AARCH64_EXIT_REASONS +class ArchA64(Arch): + def __init__(self): + self.sc_perf_evt_open = 241 + self.ioctl_numbers = IOCTL_NUMBERS + self.exit_reasons = AARCH64_EXIT_REASONS -def detect_platform(): - machine = os.uname()[4] +class ArchS390(Arch): + def __init__(self): + self.sc_perf_evt_open = 331 + self.ioctl_numbers = IOCTL_NUMBERS + self.exit_reasons = None - if machine.startswith('ppc'): - ppc_init() - elif machine.startswith('aarch64'): - aarch64_init() - elif machine.startswith('s390'): - s390_init() - else: - for line in file('/proc/cpuinfo').readlines(): - if line.startswith('flags'): - for flag in line.split(): - if flag in X86_EXIT_REASONS: - x86_init(flag) - return +ARCH = Arch.get_arch() def walkdir(path): @@ -304,11 +314,10 @@ def get_online_cpus(): def get_filters(): - detect_platform() filters = {} filters['kvm_userspace_exit'] = ('reason', USERSPACE_EXIT_REASONS) - if EXIT_REASONS: - filters['kvm_exit'] = ('exit_reason', EXIT_REASONS) + if ARCH.exit_reasons: + filters['kvm_exit'] = ('exit_reason', ARCH.exit_reasons) return filters libc = ctypes.CDLL('libc.so.6', use_errno=True) @@ -328,9 +337,9 @@ class perf_event_attr(ctypes.Structure): ('bp_len', ctypes.c_uint64), ] def perf_event_open(attr, pid, cpu, group_fd, flags): - return syscall(SC_PERF_EVT_OPEN, ctypes.pointer(attr), ctypes.c_int(pid), - ctypes.c_int(cpu), ctypes.c_int(group_fd), - ctypes.c_long(flags)) + return syscall(ARCH.sc_perf_evt_open, ctypes.pointer(attr), + ctypes.c_int(pid), ctypes.c_int(cpu), + ctypes.c_int(group_fd), ctypes.c_long(flags)) PERF_TYPE_TRACEPOINT = 2 PERF_FORMAT_GROUP = 1 << 3 @@ -388,19 +397,19 @@ class Event(object): 'while calling sys_perf_event_open().') if trace_filter: - fcntl.ioctl(fd, IOCTL_NUMBERS['SET_FILTER'], + fcntl.ioctl(fd, ARCH.ioctl_numbers['SET_FILTER'], trace_filter) self.fd = fd def enable(self): - fcntl.ioctl(self.fd, IOCTL_NUMBERS['ENABLE'], 0) + fcntl.ioctl(self.fd, ARCH.ioctl_numbers['ENABLE'], 0) def disable(self): - fcntl.ioctl(self.fd, IOCTL_NUMBERS['DISABLE'], 0) + fcntl.ioctl(self.fd, ARCH.ioctl_numbers['DISABLE'], 0) def reset(self): - fcntl.ioctl(self.fd, IOCTL_NUMBERS['RESET'], 0) + fcntl.ioctl(self.fd, ARCH.ioctl_numbers['RESET'], 0) class TracepointProvider(object): def __init__(self): -- GitLab