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Power management fixes for 5.16-rc3

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- Make intel_pstate work correctly on Ice Lake server systems with
    out-of-band performance control enabled (Adamos Ttofari).
 
  - Fix EPP handling in intel_pstate during CPU offline and online in
    the active mode (Rafael Wysocki).
 
  - Make intel_pstate support ITMT on asymmetric systems with
    overclocking enabled (Srinivas Pandruvada).
 
  - Fix hibernation image saving when using the user space interface
    based on the snapshot special device file (Evan Green).
 
  - Make the hibernation code release the snapshot block device using
    the same mode that was used when acquiring it (Thomas Zeitlhofer).
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Merge tag 'pm-5.16-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull power management fixes from Rafael Wysocki:
 "These address three issues in the intel_pstate driver and fix two
  problems related to hibernation.

  Specifics:

   - Make intel_pstate work correctly on Ice Lake server systems with
     out-of-band performance control enabled (Adamos Ttofari).

   - Fix EPP handling in intel_pstate during CPU offline and online in
     the active mode (Rafael Wysocki).

   - Make intel_pstate support ITMT on asymmetric systems with
     overclocking enabled (Srinivas Pandruvada).

   - Fix hibernation image saving when using the user space interface
     based on the snapshot special device file (Evan Green).

   - Make the hibernation code release the snapshot block device using
     the same mode that was used when acquiring it (Thomas Zeitlhofer)"

* tag 'pm-5.16-rc3' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  PM: hibernate: Fix snapshot partial write lengths
  PM: hibernate: use correct mode for swsusp_close()
  cpufreq: intel_pstate: ITMT support for overclocked system
  cpufreq: intel_pstate: Fix active mode offline/online EPP handling
  cpufreq: intel_pstate: Add Ice Lake server to out-of-band IDs
This commit is contained in:
Linus Torvalds 2021-11-26 12:14:50 -08:00
commit 0ce629b15d
3 changed files with 21 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
drivers/cpufreq/intel_pstate.c
View File

@ -338,6 +338,8 @@ static void intel_pstste_sched_itmt_work_fn(struct work_struct *work)
static DECLARE_WORK(sched_itmt_work, intel_pstste_sched_itmt_work_fn);
#define CPPC_MAX_PERF U8_MAX
static void intel_pstate_set_itmt_prio(int cpu)
{
struct cppc_perf_caps cppc_perf;
@ -348,6 +350,14 @@ static void intel_pstate_set_itmt_prio(int cpu)
if (ret)
return;
/*
* On some systems with overclocking enabled, CPPC.highest_perf is hardcoded to 0xff.
* In this case we can't use CPPC.highest_perf to enable ITMT.
* In this case we can look at MSR_HWP_CAPABILITIES bits [8:0] to decide.
*/
if (cppc_perf.highest_perf == CPPC_MAX_PERF)
cppc_perf.highest_perf = HWP_HIGHEST_PERF(READ_ONCE(all_cpu_data[cpu]->hwp_cap_cached));
/*
* The priorities can be set regardless of whether or not
* sched_set_itmt_support(true) has been called and it is valid to
@ -1006,6 +1016,12 @@ static void intel_pstate_hwp_offline(struct cpudata *cpu)
*/
value &= ~GENMASK_ULL(31, 24);
value |= HWP_ENERGY_PERF_PREFERENCE(cpu->epp_cached);
/*
* However, make sure that EPP will be set to "performance" when
* the CPU is brought back online again and the "performance"
* scaling algorithm is still in effect.
*/
cpu->epp_policy = CPUFREQ_POLICY_UNKNOWN;
}
/*
@ -2353,6 +2369,7 @@ static const struct x86_cpu_id intel_pstate_cpu_oob_ids[] __initconst = {
X86_MATCH(BROADWELL_D, core_funcs),
X86_MATCH(BROADWELL_X, core_funcs),
X86_MATCH(SKYLAKE_X, core_funcs),
X86_MATCH(ICELAKE_X, core_funcs),
{}
};

6
kernel/power/hibernate.c
View File

@ -693,7 +693,7 @@ static int load_image_and_restore(void)
goto Unlock;
error = swsusp_read(&flags);
swsusp_close(FMODE_READ);
swsusp_close(FMODE_READ | FMODE_EXCL);
if (!error)
error = hibernation_restore(flags & SF_PLATFORM_MODE);
@ -983,7 +983,7 @@ static int software_resume(void)
/* The snapshot device should not be opened while we're running */
if (!hibernate_acquire()) {
error = -EBUSY;
swsusp_close(FMODE_READ);
swsusp_close(FMODE_READ | FMODE_EXCL);
goto Unlock;
}
@ -1018,7 +1018,7 @@ static int software_resume(void)
pm_pr_dbg("Hibernation image not present or could not be loaded.\n");
return error;
Close_Finish:
swsusp_close(FMODE_READ);
swsusp_close(FMODE_READ | FMODE_EXCL);
goto Finish;
}

2
kernel/power/user.c
View File

@ -177,7 +177,7 @@ static ssize_t snapshot_write(struct file *filp, const char __user *buf,
if (res <= 0)
goto unlock;
} else {
res = PAGE_SIZE - pg_offp;
res = PAGE_SIZE;
}
if (!data_of(data->handle)) {