/* * POWER Data Stream Control Register (DSCR) default test * * This test modifies the system wide default DSCR through * it's sysfs interface and then verifies that all threads * see the correct changed DSCR value immediately. * * Copyright 2012, Anton Blanchard, IBM Corporation. * Copyright 2015, Anshuman Khandual, IBM Corporation. * * This program is free software; you can redistribute it and/or modify it * under the terms of the GNU General Public License version 2 as published * by the Free Software Foundation. */ #include "dscr.h" static unsigned long dscr; /* System DSCR default */ static unsigned long sequence; static unsigned long result[THREADS]; static void *do_test(void *in) { unsigned long thread = (unsigned long)in; unsigned long i; for (i = 0; i < COUNT; i++) { unsigned long d, cur_dscr, cur_dscr_usr; unsigned long s1, s2; s1 = ACCESS_ONCE(sequence); if (s1 & 1) continue; rmb(); d = dscr; cur_dscr = get_dscr(); cur_dscr_usr = get_dscr_usr(); rmb(); s2 = sequence; if (s1 != s2) continue; if (cur_dscr != d) { fprintf(stderr, "thread %ld kernel DSCR should be %ld " "but is %ld\n", thread, d, cur_dscr); result[thread] = 1; pthread_exit(&result[thread]); } if (cur_dscr_usr != d) { fprintf(stderr, "thread %ld user DSCR should be %ld " "but is %ld\n", thread, d, cur_dscr_usr); result[thread] = 1; pthread_exit(&result[thread]); } } result[thread] = 0; pthread_exit(&result[thread]); } int dscr_default(void) { pthread_t threads[THREADS]; unsigned long i, *status[THREADS]; unsigned long orig_dscr_default; orig_dscr_default = get_default_dscr(); /* Initial DSCR default */ dscr = 1; set_default_dscr(dscr); /* Spawn all testing threads */ for (i = 0; i < THREADS; i++) { if (pthread_create(&threads[i], NULL, do_test, (void *)i)) { perror("pthread_create() failed"); goto fail; } } srand(getpid()); /* Keep changing the DSCR default */ for (i = 0; i < COUNT; i++) { double ret = uniform_deviate(rand()); if (ret < 0.0001) { sequence++; wmb(); dscr++; if (dscr > DSCR_MAX) dscr = 0; set_default_dscr(dscr); wmb(); sequence++; } } /* Individual testing thread exit status */ for (i = 0; i < THREADS; i++) { if (pthread_join(threads[i], (void **)&(status[i]))) { perror("pthread_join() failed"); goto fail; } if (*status[i]) { printf("%ldth thread failed to join with %ld status\n", i, *status[i]); goto fail; } } set_default_dscr(orig_dscr_default); return 0; fail: set_default_dscr(orig_dscr_default); return 1; } int main(int argc, char *argv[]) { return test_harness(dscr_default, "dscr_default_test"); } earch'/>
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authorLinus Torvalds <torvalds@linux-foundation.org>2017-01-27 12:36:39 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2017-01-27 12:36:39 -0800
commit2fb78e89405f4321b86274a0c24b30896dd50529 (patch)
tree4de241e242441b80bd3f0022fc546bb07374571f /include/uapi/video/uvesafb.h
parentdd3b9f25c867cb2507a45e436d6ede8eb08e7b05 (diff)
parentc14024dbb156c8392908aaa822097d27c6af8ec8 (diff)
Merge branch 'for-linus' of git://git.kernel.dk/linux-block
Pull block fixes from Jens Axboe: "A set of fixes for this series. This contains: - Set of fixes for the nvme target code - A revert of patch from this merge window, causing a regression with WRITE_SAME on iSCSI targets at least. - A fix for a use-after-free in the new O_DIRECT bdev code. - Two fixes for the xen-blkfront driver" * 'for-linus' of git://git.kernel.dk/linux-block: Revert "sd: remove __data_len hack for WRITE SAME" nvme-fc: use blk_rq_nr_phys_segments nvmet-rdma: Fix missing dma sync to nvme data structures nvmet: Call fatal_error from keep-alive timout expiration nvmet: cancel fatal error and flush async work before free controller nvmet: delete controllers deletion upon subsystem release nvmet_fc: correct logic in disconnect queue LS handling block: fix use after free in __blkdev_direct_IO xen-blkfront: correct maximum segment accounting xen-blkfront: feature flags handling adjustments
Diffstat (limited to 'include/uapi/video/uvesafb.h')