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author | Linus Torvalds <torvalds@linux-foundation.org> | 2016-12-12 15:29:06 -0800 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-12-12 15:29:06 -0800 |
commit | f797484c26300fec842fb669c69a3a60eb66e240 (patch) | |
tree | ebec99273a584e458832e258360a688616e7bad4 /arch/x86/kernel/cpu/vmware.c | |
parent | 991bc36254457f7f5695c0a28b39a91b104067a3 (diff) | |
parent | 80e9a4f21fd7ccce7e9b8439986fd028c9946dda (diff) | |
download | linux-f797484c26300fec842fb669c69a3a60eb66e240.tar.bz2 |
Merge branch 'x86-platform-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 platform updates from Ingo Molnar:
"Two changes:
- implement various VMWare guest OS improvements/fixes (Alexey
Makhalov)
- unexport a spurious export from the intel-mid platform driver
(Lukas Wunner)"
* 'x86-platform-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
x86/vmware: Add paravirt sched clock
x86/vmware: Add basic paravirt ops support
x86/vmware: Use tsc_khz value for calibrate_cpu()
x86/platform/intel-mid: Unexport intel_mid_pci_set_power_state()
x86/vmware: Read tsc_khz only once at boot time
Diffstat (limited to 'arch/x86/kernel/cpu/vmware.c')
-rw-r--r-- | arch/x86/kernel/cpu/vmware.c | 86 |
1 files changed, 70 insertions, 16 deletions
diff --git a/arch/x86/kernel/cpu/vmware.c b/arch/x86/kernel/cpu/vmware.c index 5130985b758b..891f4dad7b2c 100644 --- a/arch/x86/kernel/cpu/vmware.c +++ b/arch/x86/kernel/cpu/vmware.c @@ -24,11 +24,16 @@ #include <linux/dmi.h> #include <linux/init.h> #include <linux/export.h> +#include <linux/clocksource.h> #include <asm/div64.h> #include <asm/x86_init.h> #include <asm/hypervisor.h> #include <asm/timer.h> #include <asm/apic.h> +#include <asm/timer.h> + +#undef pr_fmt +#define pr_fmt(fmt) "vmware: " fmt #define CPUID_VMWARE_INFO_LEAF 0x40000000 #define VMWARE_HYPERVISOR_MAGIC 0x564D5868 @@ -48,6 +53,8 @@ "2"(VMWARE_HYPERVISOR_PORT), "3"(UINT_MAX) : \ "memory"); +static unsigned long vmware_tsc_khz __ro_after_init; + static inline int __vmware_platform(void) { uint32_t eax, ebx, ecx, edx; @@ -57,35 +64,80 @@ static inline int __vmware_platform(void) static unsigned long vmware_get_tsc_khz(void) { - uint64_t tsc_hz, lpj; - uint32_t eax, ebx, ecx, edx; + return vmware_tsc_khz; +} - VMWARE_PORT(GETHZ, eax, ebx, ecx, edx); +#ifdef CONFIG_PARAVIRT +static struct cyc2ns_data vmware_cyc2ns __ro_after_init; +static int vmw_sched_clock __initdata = 1; - tsc_hz = eax | (((uint64_t)ebx) << 32); - do_div(tsc_hz, 1000); - BUG_ON(tsc_hz >> 32); - pr_info("TSC freq read from hypervisor : %lu.%03lu MHz\n", - (unsigned long) tsc_hz / 1000, - (unsigned long) tsc_hz % 1000); - - if (!preset_lpj) { - lpj = ((u64)tsc_hz * 1000); - do_div(lpj, HZ); - preset_lpj = lpj; - } +static __init int setup_vmw_sched_clock(char *s) +{ + vmw_sched_clock = 0; + return 0; +} +early_param("no-vmw-sched-clock", setup_vmw_sched_clock); + +static unsigned long long vmware_sched_clock(void) +{ + unsigned long long ns; - return tsc_hz; + ns = mul_u64_u32_shr(rdtsc(), vmware_cyc2ns.cyc2ns_mul, + vmware_cyc2ns.cyc2ns_shift); + ns -= vmware_cyc2ns.cyc2ns_offset; + return ns; } +static void __init vmware_sched_clock_setup(void) +{ + struct cyc2ns_data *d = &vmware_cyc2ns; + unsigned long long tsc_now = rdtsc(); + + clocks_calc_mult_shift(&d->cyc2ns_mul, &d->cyc2ns_shift, + vmware_tsc_khz, NSEC_PER_MSEC, 0); + d->cyc2ns_offset = mul_u64_u32_shr(tsc_now, d->cyc2ns_mul, + d->cyc2ns_shift); + + pv_time_ops.sched_clock = vmware_sched_clock; + pr_info("using sched offset of %llu ns\n", d->cyc2ns_offset); +} + +static void __init vmware_paravirt_ops_setup(void) +{ + pv_info.name = "VMware hypervisor"; + pv_cpu_ops.io_delay = paravirt_nop; + + if (vmware_tsc_khz && vmw_sched_clock) + vmware_sched_clock_setup(); +} +#else +#define vmware_paravirt_ops_setup() do {} while (0) +#endif + static void __init vmware_platform_setup(void) { uint32_t eax, ebx, ecx, edx; + uint64_t lpj, tsc_khz; VMWARE_PORT(GETHZ, eax, ebx, ecx, edx); if (ebx != UINT_MAX) { + lpj = tsc_khz = eax | (((uint64_t)ebx) << 32); + do_div(tsc_khz, 1000); + WARN_ON(tsc_khz >> 32); + pr_info("TSC freq read from hypervisor : %lu.%03lu MHz\n", + (unsigned long) tsc_khz / 1000, + (unsigned long) tsc_khz % 1000); + + if (!preset_lpj) { + do_div(lpj, HZ); + preset_lpj = lpj; + } + + vmware_tsc_khz = tsc_khz; x86_platform.calibrate_tsc = vmware_get_tsc_khz; + x86_platform.calibrate_cpu = vmware_get_tsc_khz; + #ifdef CONFIG_X86_LOCAL_APIC /* Skip lapic calibration since we know the bus frequency. */ lapic_timer_frequency = ecx / HZ; @@ -96,6 +148,8 @@ static void __init vmware_platform_setup(void) pr_warn("Failed to get TSC freq from the hypervisor\n"); } + vmware_paravirt_ops_setup(); + #ifdef CONFIG_X86_IO_APIC no_timer_check = 1; #endif |