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Merge branch 'x86-timers-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

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Pull x86 timer updates from Thomas Gleixner:
 "These updates are related to TSC handling:

   - Support platforms which have synchronized TSCs but the boot CPU has
     a non zero TSC_ADJUST value, which is considered a firmware bug on
     normal systems.

     This applies to HPE/SGI UV platforms where the platform firmware
     uses TSC_ADJUST to ensure TSC synchronization across a huge number
     of sockets, but due to power on timings the boot CPU cannot be
     guaranteed to have a zero TSC_ADJUST register value.

   - Fix the ordering of udelay calibration and kvmclock_init()

   - Cleanup the udelay and calibration code"

* 'x86-timers-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/tsc: Mark cyc2ns_init() and detect_art() __init
  x86/platform/UV: Mark tsc_check_sync as an init function
  x86/tsc: Make CONFIG_X86_TSC=n build work again
  x86/platform/UV: Add check of TSC state set by UV BIOS
  x86/tsc: Provide a means to disable TSC ART
  x86/tsc: Drastically reduce the number of firmware bug warnings
  x86/tsc: Skip TSC test and error messages if already unstable
  x86/tsc: Add option that TSC on Socket 0 being non-zero is valid
  x86/timers: Move simple_udelay_calibration() past kvmclock_init()
  x86/timers: Make recalibrate_cpu_khz() void
  x86/timers: Move the simple udelay calibration to tsc.h
This commit is contained in:
Linus Torvalds
2017-11-13 19:07:38 -08:00
parent 3643b7e05b 120fc3fbb7
commit 99306dfc06
7 changed files with 148 additions and 51 deletions
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29
arch/x86/kernel/setup.c
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@@ -812,26 +812,6 @@ dump_kernel_offset(struct notifier_block *self, unsigned long v, void *p)
return 0;
}
static void __init simple_udelay_calibration(void)
{
unsigned int tsc_khz, cpu_khz;
unsigned long lpj;
if (!boot_cpu_has(X86_FEATURE_TSC))
return;
cpu_khz = x86_platform.calibrate_cpu();
tsc_khz = x86_platform.calibrate_tsc();
tsc_khz = tsc_khz ? : cpu_khz;
if (!tsc_khz)
return;
lpj = tsc_khz * 1000;
do_div(lpj, HZ);
loops_per_jiffy = lpj;
}
/*
* Determine if we were loaded by an EFI loader. If so, then we have also been
* passed the efi memmap, systab, etc., so we should use these data structures
@@ -1039,8 +1019,6 @@ void __init setup_arch(char **cmdline_p)
*/
init_hypervisor_platform();
simple_udelay_calibration();
x86_init.resources.probe_roms();
/* after parse_early_param, so could debug it */
@@ -1125,9 +1103,6 @@ void __init setup_arch(char **cmdline_p)
memblock_set_current_limit(ISA_END_ADDRESS);
e820__memblock_setup();
if (!early_xdbc_setup_hardware())
early_xdbc_register_console();
reserve_bios_regions();
if (efi_enabled(EFI_MEMMAP)) {
@@ -1233,6 +1208,10 @@ void __init setup_arch(char **cmdline_p)
kvmclock_init();
#endif
tsc_early_delay_calibrate();
if (!early_xdbc_setup_hardware())
early_xdbc_register_console();
x86_init.paging.pagetable_init();
kasan_init();