diff options
| -rw-r--r-- | arch/x86/include/uapi/asm/hyperv.h | 11 | ||||
| -rw-r--r-- | drivers/hv/hv.c | 78 | ||||
| -rw-r--r-- | drivers/hv/hyperv_vmbus.h | 21 | ||||
| -rw-r--r-- | drivers/hv/vmbus_drv.c | 37 |
4 files changed, 145 insertions, 2 deletions
diff --git a/arch/x86/include/uapi/asm/hyperv.h b/arch/x86/include/uapi/asm/hyperv.h index 462efe746d77..90c458e66e13 100644 --- a/arch/x86/include/uapi/asm/hyperv.h +++ b/arch/x86/include/uapi/asm/hyperv.h @@ -187,6 +187,17 @@ #define HV_X64_MSR_SINT14 0x4000009E #define HV_X64_MSR_SINT15 0x4000009F +/* + * Synthetic Timer MSRs. Four timers per vcpu. + */ +#define HV_X64_MSR_STIMER0_CONFIG 0x400000B0 +#define HV_X64_MSR_STIMER0_COUNT 0x400000B1 +#define HV_X64_MSR_STIMER1_CONFIG 0x400000B2 +#define HV_X64_MSR_STIMER1_COUNT 0x400000B3 +#define HV_X64_MSR_STIMER2_CONFIG 0x400000B4 +#define HV_X64_MSR_STIMER2_COUNT 0x400000B5 +#define HV_X64_MSR_STIMER3_CONFIG 0x400000B6 +#define HV_X64_MSR_STIMER3_COUNT 0x400000B7 #define HV_X64_MSR_HYPERCALL_ENABLE 0x00000001 #define HV_X64_MSR_HYPERCALL_PAGE_ADDRESS_SHIFT 12 diff --git a/drivers/hv/hv.c b/drivers/hv/hv.c index 3e4235c7a47f..50e51a51ff8b 100644 --- a/drivers/hv/hv.c +++ b/drivers/hv/hv.c @@ -28,7 +28,9 @@ #include <linux/hyperv.h> #include <linux/version.h> #include <linux/interrupt.h> +#include <linux/clockchips.h> #include <asm/hyperv.h> +#include <asm/mshyperv.h> #include "hyperv_vmbus.h" /* The one and only */ @@ -37,6 +39,10 @@ struct hv_context hv_context = { .hypercall_page = NULL, }; +#define HV_TIMER_FREQUENCY (10 * 1000 * 1000) /* 100ns period */ +#define HV_MAX_MAX_DELTA_TICKS 0xffffffff +#define HV_MIN_DELTA_TICKS 1 + /* * query_hypervisor_info - Get version info of the windows hypervisor */ @@ -144,6 +150,8 @@ int hv_init(void) sizeof(int) * NR_CPUS); memset(hv_context.event_dpc, 0, sizeof(void *) * NR_CPUS); + memset(hv_context.clk_evt, 0, + sizeof(void *) * NR_CPUS); max_leaf = query_hypervisor_info(); @@ -258,10 +266,63 @@ u16 hv_signal_event(void *con_id) return status; } +static int hv_ce_set_next_event(unsigned long delta, + struct clock_event_device *evt) +{ + cycle_t current_tick; + + WARN_ON(evt->mode != CLOCK_EVT_MODE_ONESHOT); + + rdmsrl(HV_X64_MSR_TIME_REF_COUNT, current_tick); + current_tick += delta; + wrmsrl(HV_X64_MSR_STIMER0_COUNT, current_tick); + return 0; +} + +static void hv_ce_setmode(enum clock_event_mode mode, + struct clock_event_device *evt) +{ + union hv_timer_config timer_cfg; + + switch (mode) { + case CLOCK_EVT_MODE_PERIODIC: + /* unsupported */ + break; + + case CLOCK_EVT_MODE_ONESHOT: + timer_cfg.enable = 1; + timer_cfg.auto_enable = 1; + timer_cfg.sintx = VMBUS_MESSAGE_SINT; + wrmsrl(HV_X64_MSR_STIMER0_CONFIG, timer_cfg.as_uint64); + break; + + case CLOCK_EVT_MODE_UNUSED: + case CLOCK_EVT_MODE_SHUTDOWN: + wrmsrl(HV_X64_MSR_STIMER0_COUNT, 0); + wrmsrl(HV_X64_MSR_STIMER0_CONFIG, 0); + break; + case CLOCK_EVT_MODE_RESUME: + break; + } +} + +static void hv_init_clockevent_device(struct clock_event_device *dev, int cpu) +{ + dev->name = "Hyper-V clockevent"; + dev->features = CLOCK_EVT_FEAT_ONESHOT; + dev->cpumask = cpumask_of(cpu); + dev->rating = 1000; + dev->owner = THIS_MODULE; + + dev->set_mode = hv_ce_setmode; + dev->set_next_event = hv_ce_set_next_event; +} + int hv_synic_alloc(void) { size_t size = sizeof(struct tasklet_struct); + size_t ced_size = sizeof(struct clock_event_device); int cpu; for_each_online_cpu(cpu) { @@ -272,6 +333,13 @@ int hv_synic_alloc(void) } tasklet_init(hv_context.event_dpc[cpu], vmbus_on_event, cpu); + hv_context.clk_evt[cpu] = kzalloc(ced_size, GFP_ATOMIC); + if (hv_context.clk_evt[cpu] == NULL) { + pr_err("Unable to allocate clock event device\n"); + goto err; + } + hv_init_clockevent_device(hv_context.clk_evt[cpu], cpu); + hv_context.synic_message_page[cpu] = (void *)get_zeroed_page(GFP_ATOMIC); @@ -305,6 +373,7 @@ err: static void hv_synic_free_cpu(int cpu) { kfree(hv_context.event_dpc[cpu]); + kfree(hv_context.clk_evt[cpu]); if (hv_context.synic_event_page[cpu]) free_page((unsigned long)hv_context.synic_event_page[cpu]); if (hv_context.synic_message_page[cpu]) @@ -388,6 +457,15 @@ void hv_synic_init(void *arg) hv_context.vp_index[cpu] = (u32)vp_index; INIT_LIST_HEAD(&hv_context.percpu_list[cpu]); + + /* + * Register the per-cpu clockevent source. + */ + if (ms_hyperv.features & HV_X64_MSR_SYNTIMER_AVAILABLE) + clockevents_config_and_register(hv_context.clk_evt[cpu], + HV_TIMER_FREQUENCY, + HV_MIN_DELTA_TICKS, + HV_MAX_MAX_DELTA_TICKS); return; } diff --git a/drivers/hv/hyperv_vmbus.h b/drivers/hv/hyperv_vmbus.h index c386d8dc7223..44b1c9424712 100644 --- a/drivers/hv/hyperv_vmbus.h +++ b/drivers/hv/hyperv_vmbus.h @@ -178,6 +178,23 @@ struct hv_message_header { }; }; +/* + * Timer configuration register. + */ +union hv_timer_config { + u64 as_uint64; + struct { + u64 enable:1; + u64 periodic:1; + u64 lazy:1; + u64 auto_enable:1; + u64 reserved_z0:12; + u64 sintx:4; + u64 reserved_z1:44; + }; +}; + + /* Define timer message payload structure. */ struct hv_timer_message_payload { u32 timer_index; @@ -519,6 +536,10 @@ struct hv_context { * buffer to post messages to the host. */ void *post_msg_page[NR_CPUS]; + /* + * Support PV clockevent device. + */ + struct clock_event_device *clk_evt[NR_CPUS]; }; extern struct hv_context hv_context; diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c index 4d6b26979fbd..7488111ec057 100644 --- a/drivers/hv/vmbus_drv.c +++ b/drivers/hv/vmbus_drv.c @@ -32,6 +32,7 @@ #include <linux/completion.h> #include <linux/hyperv.h> #include <linux/kernel_stat.h> +#include <linux/clockchips.h> #include <asm/hyperv.h> #include <asm/hypervisor.h> #include <asm/mshyperv.h> @@ -578,6 +579,34 @@ static void vmbus_onmessage_work(struct work_struct *work) kfree(ctx); } +void hv_process_timer_expiration(struct hv_message *msg, int cpu) +{ + struct clock_event_device *dev = hv_context.clk_evt[cpu]; + + if (dev->event_handler) + dev->event_handler(dev); + + msg->header.message_type = HVMSG_NONE; + + /* + * Make sure the write to MessageType (ie set to + * HVMSG_NONE) happens before we read the + * MessagePending and EOMing. Otherwise, the EOMing + * will not deliver any more messages since there is + * no empty slot + */ + mb(); + + if (msg->header.message_flags.msg_pending) { + /* + * This will cause message queue rescan to + * possibly deliver another msg from the + * hypervisor + */ + wrmsrl(HV_X64_MSR_EOM, 0); + } +} + static void vmbus_on_msg_dpc(unsigned long data) { int cpu = smp_processor_id(); @@ -667,8 +696,12 @@ static void vmbus_isr(void) msg = (struct hv_message *)page_addr + VMBUS_MESSAGE_SINT; /* Check if there are actual msgs to be processed */ - if (msg->header.message_type != HVMSG_NONE) - tasklet_schedule(&msg_dpc); + if (msg->header.message_type != HVMSG_NONE) { + if (msg->header.message_type == HVMSG_TIMER_EXPIRED) + hv_process_timer_expiration(msg, cpu); + else + tasklet_schedule(&msg_dpc); + } } /* |