#include #include #include #include #include #include #include #include #include #include void usage(char *name) { printf ("Usage: %s cpunum\n", name); } int main(int argc, char **argv) { int i, cpu, fd; char msr_file_name[64]; long long tsc, old_tsc, new_tsc; long long aperf, old_aperf, new_aperf; long long mperf, old_mperf, new_mperf; struct timeb before, after; long long int start, finish, total; cpu_set_t cpuset; if (argc != 2) { usage(argv[0]); return 1; } errno = 0; cpu = strtol(argv[1], (char **) NULL, 10); if (errno) { usage(argv[0]); return 1; } sprintf(msr_file_name, "/dev/cpu/%d/msr", cpu); fd = open(msr_file_name, O_RDONLY); if (fd == -1) { perror("Failed to open"); return 1; } CPU_ZERO(&cpuset); CPU_SET(cpu, &cpuset); if (sched_setaffinity(0, sizeof(cpu_set_t), &cpuset)) { perror("Failed to set cpu affinity"); return 1; } ftime(&before); pread(fd, &old_tsc, sizeof(old_tsc), 0x10); pread(fd, &old_aperf, sizeof(old_mperf), 0xe7); pread(fd, &old_mperf, sizeof(old_aperf), 0xe8); for (i=0; i<0x8fffffff; i++) { sqrt(i); } ftime(&after); pread(fd, &new_tsc, sizeof(new_tsc), 0x10); pread(fd, &new_aperf, sizeof(new_mperf), 0xe7); pread(fd, &new_mperf, sizeof(new_aperf), 0xe8); tsc = new_tsc-old_tsc; aperf = new_aperf-old_aperf; mperf = new_mperf-old_mperf; start = before.time*1000 + before.millitm; finish = after.time*1000 + after.millitm; total = finish - start; printf("runTime: %4.2f\n", 1.0*total/1000); printf("freq: %7.0f\n", tsc / (1.0*aperf / (1.0 * mperf)) / total); return 0; } c6963c16003f50d7e8d74b02d0a143'>refslogtreecommitdiff
path: root/include/dt-bindings/interrupt-controller/mips-gic.h
diff options
context:
space:
mode:
authorBjorn Helgaas <bhelgaas@google.com>2017-01-27 15:00:45 -0600
committerBjorn Helgaas <bhelgaas@google.com>2017-01-27 15:00:45 -0600
commit030305d69fc6963c16003f50d7e8d74b02d0a143 (patch)
tree363a4e34d199178769b7e7eeb26ea2620a55847b /include/dt-bindings/interrupt-controller/mips-gic.h
parent4d191b1b63c209e37bf27938ef365244d3c41084 (diff)
PCI/ASPM: Handle PCI-to-PCIe bridges as roots of PCIe hierarchies
In a struct pcie_link_state, link->root points to the pcie_link_state of the root of the PCIe hierarchy. For the topmost link, this points to itself (link->root = link). For others, we copy the pointer from the parent (link->root = link->parent->root). Previously we recognized that Root Ports originated PCIe hierarchies, but we treated PCI/PCI-X to PCIe Bridges as being in the middle of the hierarchy, and when we tried to copy the pointer from link->parent->root, there was no parent, and we dereferenced a NULL pointer: BUG: unable to handle kernel NULL pointer dereference at 0000000000000090 IP: [<ffffffff9e424350>] pcie_aspm_init_link_state+0x170/0x820 Recognize that PCI/PCI-X to PCIe Bridges originate PCIe hierarchies just like Root Ports do, so link->root for these devices should also point to itself. Fixes: 51ebfc92b72b ("PCI: Enumerate switches below PCI-to-PCIe bridges") Link: https://bugzilla.kernel.org/show_bug.cgi?id=193411 Link: https://bugzilla.opensuse.org/show_bug.cgi?id=1022181 Tested-by: lists@ssl-mail.com Tested-by: Jayachandran C. <jnair@caviumnetworks.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> CC: stable@vger.kernel.org # v4.2+
Diffstat (limited to 'include/dt-bindings/interrupt-controller/mips-gic.h')