/* * Copyright IBM Corp. * * This program is free software; you can redistribute it and/or modify it * under the terms of version 2.1 of the GNU Lesser General Public License * as published by the Free Software Foundation. * * This program is distributed in the hope that it would be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. * */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include "utils.h" char *file_name; int in_test; volatile int faulted; volatile void *dar; int errors; static void segv(int signum, siginfo_t *info, void *ctxt_v) { ucontext_t *ctxt = (ucontext_t *)ctxt_v; struct pt_regs *regs = ctxt->uc_mcontext.regs; if (!in_test) { fprintf(stderr, "Segfault outside of test !\n"); exit(1); } faulted = 1; dar = (void *)regs->dar; regs->nip += 4; } static inline void do_read(const volatile void *addr) { int ret; asm volatile("lwz %0,0(%1); twi 0,%0,0; isync;\n" : "=r" (ret) : "r" (addr) : "memory"); } static inline void do_write(const volatile void *addr) { int val = 0x1234567; asm volatile("stw %0,0(%1); sync; \n" : : "r" (val), "r" (addr) : "memory"); } static inline void check_faulted(void *addr, long page, long subpage, int write) { int want_fault = (subpage == ((page + 3) % 16)); if (write) want_fault |= (subpage == ((page + 1) % 16)); if (faulted != want_fault) { printf("Failed at %p (p=%ld,sp=%ld,w=%d), want=%s, got=%s !\n", addr, page, subpage, write, want_fault ? "fault" : "pass", faulted ? "fault" : "pass"); ++errors; } if (faulted) { if (dar != addr) { printf("Fault expected at %p and happened at %p !\n", addr, dar); } faulted = 0; asm volatile("sync" : : : "memory"); } } static int run_test(void *addr, unsigned long size) { unsigned int *map; long i, j, pages, err; pages = size / 0x10000; map = malloc(pages * 4); assert(map); /* * for each page, mark subpage i % 16 read only and subpage * (i + 3) % 16 inaccessible */ for (i = 0; i < pages; i++) { map[i] = (0x40000000 >> (((i + 1) * 2) % 32)) | (0xc0000000 >> (((i + 3) * 2) % 32)); } err = syscall(__NR_subpage_prot, addr, size, map); if (err) { perror("subpage_perm"); return 1; } free(map); in_test = 1; errors = 0; for (i = 0; i < pages; i++) { for (j = 0; j < 16; j++, addr += 0x1000) { do_read(addr); check_faulted(addr, i, j, 0); do_write(addr); check_faulted(addr, i, j, 1); } } in_test = 0; if (errors) { printf("%d errors detected\n", errors); return 1; } return 0; } int test_anon(void) { unsigned long align; struct sigaction act = { .sa_sigaction = segv, .sa_flags = SA_SIGINFO }; void *mallocblock; unsigned long mallocsize; if (getpagesize() != 0x10000) { fprintf(stderr, "Kernel page size must be 64K!\n"); return 1; } sigaction(SIGSEGV, &act, NULL); mallocsize = 4 * 16 * 1024 * 1024; FAIL_IF(posix_memalign(&mallocblock, 64 * 1024, mallocsize)); align = (unsigned long)mallocblock; if (align & 0xffff) align = (align | 0xffff) + 1; mallocblock = (void *)align; printf("allocated malloc block of 0x%lx bytes at %p\n", mallocsize, mallocblock); printf("testing malloc block...\n"); return run_test(mallocblock, mallocsize); } int test_file(void) { struct sigaction act = { .sa_sigaction = segv, .sa_flags = SA_SIGINFO }; void *fileblock; off_t filesize; int fd; fd = open(file_name, O_RDWR); if (fd == -1) { perror("failed to open file"); return 1; } sigaction(SIGSEGV, &act, NULL); filesize = lseek(fd, 0, SEEK_END); if (filesize & 0xffff) filesize &= ~0xfffful; fileblock = mmap(NULL, filesize, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0); if (fileblock == MAP_FAILED) { perror("failed to map file"); return 1; } printf("allocated %s for 0x%lx bytes at %p\n", file_name, filesize, fileblock); printf("testing file map...\n"); return run_test(fileblock, filesize); } int main(int argc, char *argv[]) { int rc; rc = test_harness(test_anon, "subpage_prot_anon"); if (rc) return rc; if (argc > 1) file_name = argv[1]; else file_name = "tempfile"; return test_harness(test_file, "subpage_prot_file"); } tion>mode:
authorLinus Torvalds <torvalds@linux-foundation.org>2017-01-18 11:13:41 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2017-01-18 11:13:41 -0800
commitca92e6c7e6329029d7188487a5c32e86ef471977 (patch)
tree704fb5c2ca533cdb569826522eed0dbbcf31f316 /sound/spi/at73c213.c
parent0b75f821ec8be459dd4dec77be39595d989d77ac (diff)
parent4205e4786d0b9fc3b4fec7b1910cf645a0468307 (diff)
Merge branch 'smp-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull SMP hotplug update from Thomas Gleixner: "This contains a trivial typo fix and an extension to the core code for dynamically allocating states in the prepare stage. The extension is necessary right now because we need a proper way to unbreak LTTNG, which iscurrently non functional due to the removal of the notifiers. Surely it's out of tree, but it's widely used by distros. The simple solution would have been to reserve a state for LTTNG, but I'm not fond about unused crap in the kernel and the dynamic range, which we admittedly should have done right away, allows us to remove quite some of the hardcoded states, i.e. those which have no ordering requirements. So doing the right thing now is better than having an smaller intermediate solution which needs to be reworked anyway" * 'smp-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: cpu/hotplug: Provide dynamic range for prepare stage perf/x86/amd/ibs: Fix typo after cleanup state names in cpu/hotplug
Diffstat (limited to 'sound/spi/at73c213.c')