#include #include #include #include #include #include int xen_event_channel_op_compat(int cmd, void *arg) { struct evtchn_op op; int rc; op.cmd = cmd; memcpy(&op.u, arg, sizeof(op.u)); rc = _hypercall1(int, event_channel_op_compat, &op); switch (cmd) { case EVTCHNOP_close: case EVTCHNOP_send: case EVTCHNOP_bind_vcpu: case EVTCHNOP_unmask: /* no output */ break; #define COPY_BACK(eop) \ case EVTCHNOP_##eop: \ memcpy(arg, &op.u.eop, sizeof(op.u.eop)); \ break COPY_BACK(bind_interdomain); COPY_BACK(bind_virq); COPY_BACK(bind_pirq); COPY_BACK(status); COPY_BACK(alloc_unbound); COPY_BACK(bind_ipi); #undef COPY_BACK default: WARN_ON(rc != -ENOSYS); break; } return rc; } EXPORT_SYMBOL_GPL(xen_event_channel_op_compat); int xen_physdev_op_compat(int cmd, void *arg) { struct physdev_op op; int rc; op.cmd = cmd; memcpy(&op.u, arg, sizeof(op.u)); rc = _hypercall1(int, physdev_op_compat, &op); switch (cmd) { case PHYSDEVOP_IRQ_UNMASK_NOTIFY: case PHYSDEVOP_set_iopl: case PHYSDEVOP_set_iobitmap: case PHYSDEVOP_apic_write: /* no output */ break; #define COPY_BACK(pop, fld) \ case PHYSDEVOP_##pop: \ memcpy(arg, &op.u.fld, sizeof(op.u.fld)); \ break COPY_BACK(irq_status_query, irq_status_query); COPY_BACK(apic_read, apic_op); COPY_BACK(ASSIGN_VECTOR, irq_op); #undef COPY_BACK default: WARN_ON(rc != -ENOSYS); break; } return rc; } EXPORT_SYMBOL_GPL(xen_physdev_op_compat); > summaryrefslogtreecommitdiff
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authorThomas Gleixner <tglx@linutronix.de>2017-01-31 23:58:38 +0100
committerIngo Molnar <mingo@kernel.org>2017-02-01 08:37:27 +0100
commitdd86e373e09fb16b83e8adf5c48c421a4ca76468 (patch)
tree55703c2ea8584e303e342090614e0aab3509ab21 /tools/build/feature/test-libelf-mmap.c
parent0b3589be9b98994ce3d5aeca52445d1f5627c4ba (diff)
perf/x86/intel/rapl: Make package handling more robust
The package management code in RAPL relies on package mapping being available before a CPU is started. This changed with: 9d85eb9119f4 ("x86/smpboot: Make logical package management more robust") because the ACPI/BIOS information turned out to be unreliable, but that left RAPL in broken state. This was not noticed because on a regular boot all CPUs are online before RAPL is initialized. A possible fix would be to reintroduce the mess which allocates a package data structure in CPU prepare and when it turns out to already exist in starting throw it away later in the CPU online callback. But that's a horrible hack and not required at all because RAPL becomes functional for perf only in the CPU online callback. That's correct because user space is not yet informed about the CPU being onlined, so nothing caan rely on RAPL being available on that particular CPU. Move the allocation to the CPU online callback and simplify the hotplug handling. At this point the package mapping is established and correct. This also adds a missing check for available package data in the event_init() function. Reported-by: Yasuaki Ishimatsu <yasu.isimatu@gmail.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Sebastian Siewior <bigeasy@linutronix.de> Cc: Stephane Eranian <eranian@google.com> Cc: Vince Weaver <vincent.weaver@maine.edu> Fixes: 9d85eb9119f4 ("x86/smpboot: Make logical package management more robust") Link: http://lkml.kernel.org/r/20170131230141.212593966@linutronix.de Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'tools/build/feature/test-libelf-mmap.c')