diff options
Diffstat (limited to 'drivers/hv/vmbus_drv.c')
| -rw-r--r-- | drivers/hv/vmbus_drv.c | 97 |
1 files changed, 82 insertions, 15 deletions
diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c index 10dce9f91216..92cb3f7d21d9 100644 --- a/drivers/hv/vmbus_drv.c +++ b/drivers/hv/vmbus_drv.c @@ -48,8 +48,10 @@ static int hyperv_cpuhp_online; static void *hv_panic_page; +static long __percpu *vmbus_evt; + /* Values parsed from ACPI DSDT */ -static int vmbus_irq; +int vmbus_irq; int vmbus_interrupt; /* @@ -1381,7 +1383,13 @@ static void vmbus_isr(void) tasklet_schedule(&hv_cpu->msg_dpc); } - add_interrupt_randomness(hv_get_vector(), 0); + add_interrupt_randomness(vmbus_interrupt, 0); +} + +static irqreturn_t vmbus_percpu_isr(int irq, void *dev_id) +{ + vmbus_isr(); + return IRQ_HANDLED; } /* @@ -1391,23 +1399,39 @@ static void vmbus_isr(void) static void hv_kmsg_dump(struct kmsg_dumper *dumper, enum kmsg_dump_reason reason) { + struct kmsg_dump_iter iter; size_t bytes_written; - phys_addr_t panic_pa; /* We are only interested in panics. */ if ((reason != KMSG_DUMP_PANIC) || (!sysctl_record_panic_msg)) return; - panic_pa = virt_to_phys(hv_panic_page); - /* * Write dump contents to the page. No need to synchronize; panic should * be single-threaded. */ - kmsg_dump_get_buffer(dumper, false, hv_panic_page, HV_HYP_PAGE_SIZE, + kmsg_dump_rewind(&iter); + kmsg_dump_get_buffer(&iter, false, hv_panic_page, HV_HYP_PAGE_SIZE, &bytes_written); - if (bytes_written) - hyperv_report_panic_msg(panic_pa, bytes_written); + if (!bytes_written) + return; + /* + * P3 to contain the physical address of the panic page & P4 to + * contain the size of the panic data in that page. Rest of the + * registers are no-op when the NOTIFY_MSG flag is set. + */ + hv_set_register(HV_REGISTER_CRASH_P0, 0); + hv_set_register(HV_REGISTER_CRASH_P1, 0); + hv_set_register(HV_REGISTER_CRASH_P2, 0); + hv_set_register(HV_REGISTER_CRASH_P3, virt_to_phys(hv_panic_page)); + hv_set_register(HV_REGISTER_CRASH_P4, bytes_written); + + /* + * Let Hyper-V know there is crash data available along with + * the panic message. + */ + hv_set_register(HV_REGISTER_CRASH_CTL, + (HV_CRASH_CTL_CRASH_NOTIFY | HV_CRASH_CTL_CRASH_NOTIFY_MSG)); } static struct kmsg_dumper hv_kmsg_dumper = { @@ -1482,9 +1506,28 @@ static int vmbus_bus_init(void) if (ret) return ret; - ret = hv_setup_vmbus_irq(vmbus_irq, vmbus_isr); - if (ret) - goto err_setup; + /* + * VMbus interrupts are best modeled as per-cpu interrupts. If + * on an architecture with support for per-cpu IRQs (e.g. ARM64), + * allocate a per-cpu IRQ using standard Linux kernel functionality. + * If not on such an architecture (e.g., x86/x64), then rely on + * code in the arch-specific portion of the code tree to connect + * the VMbus interrupt handler. + */ + + if (vmbus_irq == -1) { + hv_setup_vmbus_handler(vmbus_isr); + } else { + vmbus_evt = alloc_percpu(long); + ret = request_percpu_irq(vmbus_irq, vmbus_percpu_isr, + "Hyper-V VMbus", vmbus_evt); + if (ret) { + pr_err("Can't request Hyper-V VMbus IRQ %d, Err %d", + vmbus_irq, ret); + free_percpu(vmbus_evt); + goto err_setup; + } + } ret = hv_synic_alloc(); if (ret) @@ -1521,7 +1564,7 @@ static int vmbus_bus_init(void) * Register for panic kmsg callback only if the right * capability is supported by the hypervisor. */ - hv_get_crash_ctl(hyperv_crash_ctl); + hyperv_crash_ctl = hv_get_register(HV_REGISTER_CRASH_CTL); if (hyperv_crash_ctl & HV_CRASH_CTL_CRASH_NOTIFY_MSG) hv_kmsg_dump_register(); @@ -1545,7 +1588,12 @@ err_connect: err_cpuhp: hv_synic_free(); err_alloc: - hv_remove_vmbus_irq(); + if (vmbus_irq == -1) { + hv_remove_vmbus_handler(); + } else { + free_percpu_irq(vmbus_irq, vmbus_evt); + free_percpu(vmbus_evt); + } err_setup: bus_unregister(&hv_bus); unregister_sysctl_table(hv_ctl_table_hdr); @@ -1802,13 +1850,15 @@ static ssize_t target_cpu_store(struct vmbus_channel *channel, if (target_cpu == origin_cpu) goto cpu_store_unlock; - if (vmbus_send_modifychannel(channel->offermsg.child_relid, + if (vmbus_send_modifychannel(channel, hv_cpu_number_to_vp_number(target_cpu))) { ret = -EIO; goto cpu_store_unlock; } /* + * For version before VERSION_WIN10_V5_3, the following warning holds: + * * Warning. At this point, there is *no* guarantee that the host will * have successfully processed the vmbus_send_modifychannel() request. * See the header comment of vmbus_send_modifychannel() for more info. @@ -2663,6 +2713,18 @@ static int __init hv_acpi_init(void) ret = -ETIMEDOUT; goto cleanup; } + + /* + * If we're on an architecture with a hardcoded hypervisor + * vector (i.e. x86/x64), override the VMbus interrupt found + * in the ACPI tables. Ensure vmbus_irq is not set since the + * normal Linux IRQ mechanism is not used in this case. + */ +#ifdef HYPERVISOR_CALLBACK_VECTOR + vmbus_interrupt = HYPERVISOR_CALLBACK_VECTOR; + vmbus_irq = -1; +#endif + hv_debug_init(); ret = vmbus_bus_init(); @@ -2693,7 +2755,12 @@ static void __exit vmbus_exit(void) vmbus_connection.conn_state = DISCONNECTED; hv_stimer_global_cleanup(); vmbus_disconnect(); - hv_remove_vmbus_irq(); + if (vmbus_irq == -1) { + hv_remove_vmbus_handler(); + } else { + free_percpu_irq(vmbus_irq, vmbus_evt); + free_percpu(vmbus_evt); + } for_each_online_cpu(cpu) { struct hv_per_cpu_context *hv_cpu = per_cpu_ptr(hv_context.cpu_context, cpu); |