Drivers: hv: vmbus: Consolidate all Hyper-V specific clocksource code

As part of the effort to separate out architecture specific code,
consolidate all Hyper-V specific clocksource code to an architecture
specific code.

Signed-off-by: K. Y. Srinivasan <kys@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 0 insertions, 95 deletions

diff --git a/drivers/hv/hv.c b/drivers/hv/hv.c
index fd3b9b98a29d..1a33b59776d3 100644
--- a/drivers/hv/hv.c
+++ b/drivers/hv/hv.c
@@ -87,56 +87,6 @@ static int query_hypervisor_info(void)
         return max_leaf;
 }
 
-#ifdef CONFIG_X86_64
-static u64 read_hv_clock_tsc(struct clocksource *arg)
-{
-        u64 current_tick;
-        struct ms_hyperv_tsc_page *tsc_pg = hv_context.tsc_page;
-
-        if (tsc_pg->tsc_sequence != 0) {
-                /*
-                 * Use the tsc page to compute the value.
-                 */
-
-                while (1) {
-                        u64 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 != 0)
-                                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.
  *
@@ -171,29 +121,7 @@ int hv_init(void)
         if (!hypercall_msr.enable)
                 return -ENOTSUPP;
 
-#ifdef CONFIG_X86_64
-        if (ms_hyperv.features & HV_X64_MSR_REFERENCE_TSC_AVAILABLE) {
-                union hv_x64_msr_hypercall_contents tsc_msr;
-                void *va_tsc;
-
-                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:
-        return -ENOTSUPP;
 }
 
 /*
@@ -204,29 +132,6 @@ cleanup:
 void hv_cleanup(bool crash)
 {
 
-#ifdef CONFIG_X86_64
-        union hv_x64_msr_hypercall_contents hypercall_msr;
-        /*
-         * Cleanup the TSC page based CS.
-         */
-        if (ms_hyperv.features & HV_X64_MSR_REFERENCE_TSC_AVAILABLE) {
-                /*
-                 * Crash can happen in an interrupt context and unregistering
-                 * a clocksource is impossible and redundant in this case.
-                 */
-                if (!oops_in_progress) {
-                        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);
-                if (!crash) {
-                        vfree(hv_context.tsc_page);
-                        hv_context.tsc_page = NULL;
-                }
-        }
-#endif
 }
 
 /*