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path: root/drivers/hv/hv.c
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Diffstat (limited to 'drivers/hv/hv.c')
-rw-r--r--drivers/hv/hv.c152
1 files changed, 119 insertions, 33 deletions
diff --git a/drivers/hv/hv.c b/drivers/hv/hv.c
index d3943bcee..6341be873 100644
--- a/drivers/hv/hv.c
+++ b/drivers/hv/hv.c
@@ -93,11 +93,14 @@ static int query_hypervisor_info(void)
*/
static u64 do_hypercall(u64 control, void *input, void *output)
{
-#ifdef CONFIG_X86_64
- u64 hv_status = 0;
u64 input_address = (input) ? virt_to_phys(input) : 0;
u64 output_address = (output) ? virt_to_phys(output) : 0;
void *hypercall_page = hv_context.hypercall_page;
+#ifdef CONFIG_X86_64
+ u64 hv_status = 0;
+
+ if (!hypercall_page)
+ return (u64)ULLONG_MAX;
__asm__ __volatile__("mov %0, %%r8" : : "r" (output_address) : "r8");
__asm__ __volatile__("call *%3" : "=a" (hv_status) :
@@ -112,13 +115,13 @@ static u64 do_hypercall(u64 control, void *input, void *output)
u32 control_lo = control & 0xFFFFFFFF;
u32 hv_status_hi = 1;
u32 hv_status_lo = 1;
- u64 input_address = (input) ? virt_to_phys(input) : 0;
u32 input_address_hi = input_address >> 32;
u32 input_address_lo = input_address & 0xFFFFFFFF;
- u64 output_address = (output) ? virt_to_phys(output) : 0;
u32 output_address_hi = output_address >> 32;
u32 output_address_lo = output_address & 0xFFFFFFFF;
- void *hypercall_page = hv_context.hypercall_page;
+
+ if (!hypercall_page)
+ return (u64)ULLONG_MAX;
__asm__ __volatile__ ("call *%8" : "=d"(hv_status_hi),
"=a"(hv_status_lo) : "d" (control_hi),
@@ -130,6 +133,56 @@ static u64 do_hypercall(u64 control, void *input, void *output)
#endif /* !x86_64 */
}
+#ifdef CONFIG_X86_64
+static cycle_t read_hv_clock_tsc(struct clocksource *arg)
+{
+ cycle_t current_tick;
+ struct ms_hyperv_tsc_page *tsc_pg = hv_context.tsc_page;
+
+ if (tsc_pg->tsc_sequence != -1) {
+ /*
+ * Use the tsc page to compute the value.
+ */
+
+ while (1) {
+ cycle_t tmp;
+ u32 sequence = tsc_pg->tsc_sequence;
+ u64 cur_tsc;
+ u64 scale = tsc_pg->tsc_scale;
+ s64 offset = tsc_pg->tsc_offset;
+
+ rdtscll(cur_tsc);
+ /* current_tick = ((cur_tsc *scale) >> 64) + offset */
+ asm("mulq %3"
+ : "=d" (current_tick), "=a" (tmp)
+ : "a" (cur_tsc), "r" (scale));
+
+ current_tick += offset;
+ if (tsc_pg->tsc_sequence == sequence)
+ return current_tick;
+
+ if (tsc_pg->tsc_sequence != -1)
+ continue;
+ /*
+ * Fallback using MSR method.
+ */
+ break;
+ }
+ }
+ rdmsrl(HV_X64_MSR_TIME_REF_COUNT, current_tick);
+ return current_tick;
+}
+
+static struct clocksource hyperv_cs_tsc = {
+ .name = "hyperv_clocksource_tsc_page",
+ .rating = 425,
+ .read = read_hv_clock_tsc,
+ .mask = CLOCKSOURCE_MASK(64),
+ .flags = CLOCK_SOURCE_IS_CONTINUOUS,
+};
+#endif
+
+
/*
* hv_init - Main initialization routine.
*
@@ -139,7 +192,9 @@ int hv_init(void)
{
int max_leaf;
union hv_x64_msr_hypercall_contents hypercall_msr;
+ union hv_x64_msr_hypercall_contents tsc_msr;
void *virtaddr = NULL;
+ void *va_tsc = NULL;
memset(hv_context.synic_event_page, 0, sizeof(void *) * NR_CPUS);
memset(hv_context.synic_message_page, 0,
@@ -183,6 +238,22 @@ int hv_init(void)
hv_context.hypercall_page = virtaddr;
+#ifdef CONFIG_X86_64
+ if (ms_hyperv.features & HV_X64_MSR_REFERENCE_TSC_AVAILABLE) {
+ va_tsc = __vmalloc(PAGE_SIZE, GFP_KERNEL, PAGE_KERNEL);
+ if (!va_tsc)
+ goto cleanup;
+ hv_context.tsc_page = va_tsc;
+
+ rdmsrl(HV_X64_MSR_REFERENCE_TSC, tsc_msr.as_uint64);
+
+ tsc_msr.enable = 1;
+ tsc_msr.guest_physical_address = vmalloc_to_pfn(va_tsc);
+
+ wrmsrl(HV_X64_MSR_REFERENCE_TSC, tsc_msr.as_uint64);
+ clocksource_register_hz(&hyperv_cs_tsc, NSEC_PER_SEC/100);
+ }
+#endif
return 0;
cleanup:
@@ -216,6 +287,21 @@ void hv_cleanup(void)
vfree(hv_context.hypercall_page);
hv_context.hypercall_page = NULL;
}
+
+#ifdef CONFIG_X86_64
+ /*
+ * Cleanup the TSC page based CS.
+ */
+ if (ms_hyperv.features & HV_X64_MSR_REFERENCE_TSC_AVAILABLE) {
+ clocksource_change_rating(&hyperv_cs_tsc, 10);
+ clocksource_unregister(&hyperv_cs_tsc);
+
+ hypercall_msr.as_uint64 = 0;
+ wrmsrl(HV_X64_MSR_REFERENCE_TSC, hypercall_msr.as_uint64);
+ vfree(hv_context.tsc_page);
+ hv_context.tsc_page = NULL;
+ }
+#endif
}
/*
@@ -271,7 +357,7 @@ static int hv_ce_set_next_event(unsigned long delta,
{
cycle_t current_tick;
- WARN_ON(evt->mode != CLOCK_EVT_MODE_ONESHOT);
+ WARN_ON(!clockevent_state_oneshot(evt));
rdmsrl(HV_X64_MSR_TIME_REF_COUNT, current_tick);
current_tick += delta;
@@ -279,31 +365,24 @@ static int hv_ce_set_next_event(unsigned long delta,
return 0;
}
-static void hv_ce_setmode(enum clock_event_mode mode,
- struct clock_event_device *evt)
+static int hv_ce_shutdown(struct clock_event_device *evt)
+{
+ wrmsrl(HV_X64_MSR_STIMER0_COUNT, 0);
+ wrmsrl(HV_X64_MSR_STIMER0_CONFIG, 0);
+
+ return 0;
+}
+
+static int hv_ce_set_oneshot(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;
- }
+ 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);
+
+ return 0;
}
static void hv_init_clockevent_device(struct clock_event_device *dev, int cpu)
@@ -318,7 +397,8 @@ static void hv_init_clockevent_device(struct clock_event_device *dev, int cpu)
* references to the hv_vmbus module making it impossible to unload.
*/
- dev->set_mode = hv_ce_setmode;
+ dev->set_state_shutdown = hv_ce_shutdown;
+ dev->set_state_oneshot = hv_ce_set_oneshot;
dev->set_next_event = hv_ce_set_next_event;
}
@@ -329,6 +409,13 @@ int hv_synic_alloc(void)
size_t ced_size = sizeof(struct clock_event_device);
int cpu;
+ hv_context.hv_numa_map = kzalloc(sizeof(struct cpumask) * nr_node_ids,
+ GFP_ATOMIC);
+ if (hv_context.hv_numa_map == NULL) {
+ pr_err("Unable to allocate NUMA map\n");
+ goto err;
+ }
+
for_each_online_cpu(cpu) {
hv_context.event_dpc[cpu] = kmalloc(size, GFP_ATOMIC);
if (hv_context.event_dpc[cpu] == NULL) {
@@ -342,6 +429,7 @@ int hv_synic_alloc(void)
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] =
@@ -390,6 +478,7 @@ void hv_synic_free(void)
{
int cpu;
+ kfree(hv_context.hv_numa_map);
for_each_online_cpu(cpu)
hv_synic_free_cpu(cpu);
}
@@ -503,8 +592,7 @@ void hv_synic_cleanup(void *arg)
/* Turn off clockevent device */
if (ms_hyperv.features & HV_X64_MSR_SYNTIMER_AVAILABLE)
- hv_ce_setmode(CLOCK_EVT_MODE_SHUTDOWN,
- hv_context.clk_evt[cpu]);
+ hv_ce_shutdown(hv_context.clk_evt[cpu]);
rdmsrl(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT, shared_sint.as_uint64);
@@ -530,6 +618,4 @@ void hv_synic_cleanup(void *arg)
rdmsrl(HV_X64_MSR_SCONTROL, sctrl.as_uint64);
sctrl.enable = 0;
wrmsrl(HV_X64_MSR_SCONTROL, sctrl.as_uint64);
-
- hv_synic_free_cpu(cpu);
}
generated by cgit v1.2.3-54-g00ecf (git 2.45.2) at 2024-11-16 13:22:21 +0000