/* * Copyright 2013, Michael Ellerman, IBM Corp. * Licensed under GPLv2. */ #define _GNU_SOURCE #include #include #include #include #include #include "event.h" int perf_event_open(struct perf_event_attr *attr, pid_t pid, int cpu, int group_fd, unsigned long flags) { return syscall(__NR_perf_event_open, attr, pid, cpu, group_fd, flags); } void event_init_opts(struct event *e, u64 config, int type, char *name) { memset(e, 0, sizeof(*e)); e->name = name; e->attr.type = type; e->attr.config = config; e->attr.size = sizeof(e->attr); /* This has to match the structure layout in the header */ e->attr.read_format = PERF_FORMAT_TOTAL_TIME_ENABLED | \ PERF_FORMAT_TOTAL_TIME_RUNNING; } void event_init_named(struct event *e, u64 config, char *name) { event_init_opts(e, config, PERF_TYPE_RAW, name); } void event_init(struct event *e, u64 config) { event_init_opts(e, config, PERF_TYPE_RAW, "event"); } #define PERF_CURRENT_PID 0 #define PERF_NO_PID -1 #define PERF_NO_CPU -1 #define PERF_NO_GROUP -1 int event_open_with_options(struct event *e, pid_t pid, int cpu, int group_fd) { e->fd = perf_event_open(&e->attr, pid, cpu, group_fd, 0); if (e->fd == -1) { perror("perf_event_open"); return -1; } return 0; } int event_open_with_group(struct event *e, int group_fd) { return event_open_with_options(e, PERF_CURRENT_PID, PERF_NO_CPU, group_fd); } int event_open_with_pid(struct event *e, pid_t pid) { return event_open_with_options(e, pid, PERF_NO_CPU, PERF_NO_GROUP); } int event_open_with_cpu(struct event *e, int cpu) { return event_open_with_options(e, PERF_NO_PID, cpu, PERF_NO_GROUP); } int event_open(struct event *e) { return event_open_with_options(e, PERF_CURRENT_PID, PERF_NO_CPU, PERF_NO_GROUP); } void event_close(struct event *e) { close(e->fd); } int event_enable(struct event *e) { return ioctl(e->fd, PERF_EVENT_IOC_ENABLE); } int event_disable(struct event *e) { return ioctl(e->fd, PERF_EVENT_IOC_DISABLE); } int event_reset(struct event *e) { return ioctl(e->fd, PERF_EVENT_IOC_RESET); } int event_read(struct event *e) { int rc; rc = read(e->fd, &e->result, sizeof(e->result)); if (rc != sizeof(e->result)) { fprintf(stderr, "read error on event %p!\n", e); return -1; } return 0; } void event_report_justified(struct event *e, int name_width, int result_width) { printf("%*s: result %*llu ", name_width, e->name, result_width, e->result.value); if (e->result.running == e->result.enabled) printf("running/enabled %llu\n", e->result.running); else printf("running %llu enabled %llu\n", e->result.running, e->result.enabled); } void event_report(struct event *e) { event_report_justified(e, 0, 0); } e=''/>
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authorArd Biesheuvel <ard.biesheuvel@linaro.org>2017-02-01 17:45:02 +0000
committerIngo Molnar <mingo@kernel.org>2017-02-01 21:17:49 +0100
commitc8f325a59cfc718d13a50fbc746ed9b415c25e92 (patch)
treed53fbdac9d0781e39a13b2ac6b2bd258cf3b4140 /net/rose/rose_in.c
parentbf29bddf0417a4783da3b24e8c9e017ac649326f (diff)
efi/fdt: Avoid FDT manipulation after ExitBootServices()
Some AArch64 UEFI implementations disable the MMU in ExitBootServices(), after which unaligned accesses to RAM are no longer supported. Commit: abfb7b686a3e ("efi/libstub/arm*: Pass latest memory map to the kernel") fixed an issue in the memory map handling of the stub FDT code, but inadvertently created an issue with such firmware, by moving some of the FDT manipulation to after the invocation of ExitBootServices(). Given that the stub's libfdt implementation uses the ordinary, accelerated string functions, which rely on hardware handling of unaligned accesses, manipulating the FDT with the MMU off may result in alignment faults. So fix the situation by moving the update_fdt_memmap() call into the callback function invoked by efi_exit_boot_services() right before it calls the ExitBootServices() UEFI service (which is arguably a better place for it anyway) Note that disabling the MMU in ExitBootServices() is not compliant with the UEFI spec, and carries great risk due to the fact that switching from cached to uncached memory accesses halfway through compiler generated code (i.e., involving a stack) can never be done in a way that is architecturally safe. Fixes: abfb7b686a3e ("efi/libstub/arm*: Pass latest memory map to the kernel") Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org> Tested-by: Riku Voipio <riku.voipio@linaro.org> Cc: <stable@vger.kernel.org> Cc: mark.rutland@arm.com Cc: linux-efi@vger.kernel.org Cc: matt@codeblueprint.co.uk Cc: leif.lindholm@linaro.org Cc: linux-arm-kernel@lists.infradead.org Link: http://lkml.kernel.org/r/1485971102-23330-2-git-send-email-ard.biesheuvel@linaro.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'net/rose/rose_in.c')