/* * Copyright 2015, Michael Neuling, IBM Corp. * Licensed under GPLv2. * * Original: Michael Neuling 3/4/2014 * Modified: Rashmica Gupta 8/12/2015 * * Check if any of the Transaction Memory SPRs get corrupted. * - TFIAR - stores address of location of transaction failure * - TFHAR - stores address of software failure handler (if transaction * fails) * - TEXASR - lots of info about the transacion(s) * * (1) create more threads than cpus * (2) in each thread: * (a) set TFIAR and TFHAR a unique value * (b) loop for awhile, continually checking to see if * either register has been corrupted. * * (3) Loop: * (a) begin transaction * (b) abort transaction * (c) check TEXASR to see if FS has been corrupted * */ #define _GNU_SOURCE #include #include #include #include #include #include "utils.h" #include "tm.h" int num_loops = 10000; int passed = 1; void tfiar_tfhar(void *in) { int i, cpu; unsigned long tfhar, tfhar_rd, tfiar, tfiar_rd; cpu_set_t cpuset; CPU_ZERO(&cpuset); cpu = (unsigned long)in >> 1; CPU_SET(cpu, &cpuset); sched_setaffinity(0, sizeof(cpuset), &cpuset); /* TFIAR: Last bit has to be high so userspace can read register */ tfiar = ((unsigned long)in) + 1; tfiar += 2; mtspr(SPRN_TFIAR, tfiar); /* TFHAR: Last two bits are reserved */ tfhar = ((unsigned long)in); tfhar &= ~0x3UL; tfhar += 4; mtspr(SPRN_TFHAR, tfhar); for (i = 0; i < num_loops; i++) { tfhar_rd = mfspr(SPRN_TFHAR); tfiar_rd = mfspr(SPRN_TFIAR); if ( (tfhar != tfhar_rd) || (tfiar != tfiar_rd) ) { passed = 0; return; } } return; } void texasr(void *in) { unsigned long i; uint64_t result = 0; for (i = 0; i < num_loops; i++) { asm __volatile__( "tbegin.;" "beq 3f ;" "tabort. 0 ;" "tend.;" /* Abort handler */ "3: ;" ::: "memory"); /* Check the TEXASR */ result = mfspr(SPRN_TEXASR); if ((result & TEXASR_FS) == 0) { passed = 0; return; } } return; } int test_tmspr() { pthread_t thread; int thread_num; unsigned long i; SKIP_IF(!have_htm()); /* To cause some context switching */ thread_num = 10 * sysconf(_SC_NPROCESSORS_ONLN); /* Test TFIAR and TFHAR */ for (i = 0 ; i < thread_num ; i += 2){ if (pthread_create(&thread, NULL, (void*)tfiar_tfhar, (void *)i)) return EXIT_FAILURE; } if (pthread_join(thread, NULL) != 0) return EXIT_FAILURE; /* Test TEXASR */ for (i = 0 ; i < thread_num ; i++){ if (pthread_create(&thread, NULL, (void*)texasr, (void *)i)) return EXIT_FAILURE; } if (pthread_join(thread, NULL) != 0) return EXIT_FAILURE; if (passed) return 0; else return 1; } int main(int argc, char *argv[]) { if (argc > 1) { if (strcmp(argv[1], "-h") == 0) { printf("Syntax:\t []\n"); return 0; } else { num_loops = atoi(argv[1]); } } return test_harness(test_tmspr, "tm_tmspr"); } 00980552fe508c'>root/drivers/usb/musb
diff options
context:
space:
mode:
authorDexuan Cui <decui@microsoft.com>2017-01-28 11:46:02 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-01-31 10:59:48 +0100
commit433e19cf33d34bb6751c874a9c00980552fe508c (patch)
treece6547ef2987fbb289fa28f03536328a42781651 /drivers/usb/musb
parent191e885a2e130e639bb0c8ee350d7047294f2ce6 (diff)
Drivers: hv: vmbus: finally fix hv_need_to_signal_on_read()
Commit a389fcfd2cb5 ("Drivers: hv: vmbus: Fix signaling logic in hv_need_to_signal_on_read()") added the proper mb(), but removed the test "prev_write_sz < pending_sz" when making the signal decision. As a result, the guest can signal the host unnecessarily, and then the host can throttle the guest because the host thinks the guest is buggy or malicious; finally the user running stress test can perceive intermittent freeze of the guest. This patch brings back the test, and properly handles the in-place consumption APIs used by NetVSC (see get_next_pkt_raw(), put_pkt_raw() and commit_rd_index()). Fixes: a389fcfd2cb5 ("Drivers: hv: vmbus: Fix signaling logic in hv_need_to_signal_on_read()") Signed-off-by: Dexuan Cui <decui@microsoft.com> Reported-by: Rolf Neugebauer <rolf.neugebauer@docker.com> Tested-by: Rolf Neugebauer <rolf.neugebauer@docker.com> Cc: "K. Y. Srinivasan" <kys@microsoft.com> Cc: Haiyang Zhang <haiyangz@microsoft.com> Cc: Stephen Hemminger <sthemmin@microsoft.com> Cc: <stable@vger.kernel.org> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/usb/musb')