From 4f48ec8a1c070f00c3d675b664e8b3879e5286e5 Mon Sep 17 00:00:00 2001 From: Markus Elfring Date: Sat, 23 Jul 2016 17:04:00 +0200 Subject: PM-wakeup: Delete unnecessary checks before three function calls The following functions test whether their argument is NULL and then return immediately. * dev_pm_arm_wake_irq * dev_pm_disarm_wake_irq * wakeup_source_unregister Thus the test around the calls is not needed. This issue was detected by using the Coccinelle software. Signed-off-by: Markus Elfring Acked-by: Pavel Machek [ rjw: Minor whitespace adjustments ] Signed-off-by: Rafael J. Wysocki --- drivers/base/power/wakeup.c | 18 +++++++----------- 1 file changed, 7 insertions(+), 11 deletions(-) diff --git a/drivers/base/power/wakeup.c b/drivers/base/power/wakeup.c index 5fb7718f256c..62e4de2aa8d1 100644 --- a/drivers/base/power/wakeup.c +++ b/drivers/base/power/wakeup.c @@ -334,10 +334,9 @@ void device_wakeup_arm_wake_irqs(void) struct wakeup_source *ws; rcu_read_lock(); - list_for_each_entry_rcu(ws, &wakeup_sources, entry) { - if (ws->wakeirq) - dev_pm_arm_wake_irq(ws->wakeirq); - } + list_for_each_entry_rcu(ws, &wakeup_sources, entry) + dev_pm_arm_wake_irq(ws->wakeirq); + rcu_read_unlock(); } @@ -351,10 +350,9 @@ void device_wakeup_disarm_wake_irqs(void) struct wakeup_source *ws; rcu_read_lock(); - list_for_each_entry_rcu(ws, &wakeup_sources, entry) { - if (ws->wakeirq) - dev_pm_disarm_wake_irq(ws->wakeirq); - } + list_for_each_entry_rcu(ws, &wakeup_sources, entry) + dev_pm_disarm_wake_irq(ws->wakeirq); + rcu_read_unlock(); } @@ -390,9 +388,7 @@ int device_wakeup_disable(struct device *dev) return -EINVAL; ws = device_wakeup_detach(dev); - if (ws) - wakeup_source_unregister(ws); - + wakeup_source_unregister(ws); return 0; } EXPORT_SYMBOL_GPL(device_wakeup_disable); -- cgit v1.2.3-58-ga151 From 067b7ce083df6c69e67345bdba658ab59274cc01 Mon Sep 17 00:00:00 2001 From: Jisheng Zhang Date: Mon, 25 Jul 2016 14:11:16 +0800 Subject: PM / OPP: optimize dev_pm_opp_set_rate() performance a bit In dev_pm_opp_set_rate(), _find_opp_table() is called 4 times: once by _get_opp_clk(), once by dev_pm_opp_set_rate() itself, and twice by dev_pm_opp_find_freq_ceil(). If there are several opp_tables in the system, three times of opp table finding is a big waste. This patch reduced the call of _find_opp_table() to twice. Signed-off-by: Jisheng Zhang Acked-by: Viresh Kumar Signed-off-by: Rafael J. Wysocki --- drivers/base/power/opp/core.c | 31 +++++++++++++++++++------------ 1 file changed, 19 insertions(+), 12 deletions(-) diff --git a/drivers/base/power/opp/core.c b/drivers/base/power/opp/core.c index 7c04c87738a6..df0c70963d9e 100644 --- a/drivers/base/power/opp/core.c +++ b/drivers/base/power/opp/core.c @@ -402,6 +402,22 @@ struct dev_pm_opp *dev_pm_opp_find_freq_exact(struct device *dev, } EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_exact); +static noinline struct dev_pm_opp *_find_freq_ceil(struct opp_table *opp_table, + unsigned long *freq) +{ + struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE); + + list_for_each_entry_rcu(temp_opp, &opp_table->opp_list, node) { + if (temp_opp->available && temp_opp->rate >= *freq) { + opp = temp_opp; + *freq = opp->rate; + break; + } + } + + return opp; +} + /** * dev_pm_opp_find_freq_ceil() - Search for an rounded ceil freq * @dev: device for which we do this operation @@ -427,7 +443,6 @@ struct dev_pm_opp *dev_pm_opp_find_freq_ceil(struct device *dev, unsigned long *freq) { struct opp_table *opp_table; - struct dev_pm_opp *temp_opp, *opp = ERR_PTR(-ERANGE); opp_rcu_lockdep_assert(); @@ -440,15 +455,7 @@ struct dev_pm_opp *dev_pm_opp_find_freq_ceil(struct device *dev, if (IS_ERR(opp_table)) return ERR_CAST(opp_table); - list_for_each_entry_rcu(temp_opp, &opp_table->opp_list, node) { - if (temp_opp->available && temp_opp->rate >= *freq) { - opp = temp_opp; - *freq = opp->rate; - break; - } - } - - return opp; + return _find_freq_ceil(opp_table, freq); } EXPORT_SYMBOL_GPL(dev_pm_opp_find_freq_ceil); @@ -612,7 +619,7 @@ int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq) return PTR_ERR(opp_table); } - old_opp = dev_pm_opp_find_freq_ceil(dev, &old_freq); + old_opp = _find_freq_ceil(opp_table, &old_freq); if (!IS_ERR(old_opp)) { ou_volt = old_opp->u_volt; ou_volt_min = old_opp->u_volt_min; @@ -622,7 +629,7 @@ int dev_pm_opp_set_rate(struct device *dev, unsigned long target_freq) __func__, old_freq, PTR_ERR(old_opp)); } - opp = dev_pm_opp_find_freq_ceil(dev, &freq); + opp = _find_freq_ceil(opp_table, &freq); if (IS_ERR(opp)) { ret = PTR_ERR(opp); dev_err(dev, "%s: failed to find OPP for freq %lu (%d)\n", -- cgit v1.2.3-58-ga151 From 65c1262f40502cbce205a3fcfcaa48f87630bde2 Mon Sep 17 00:00:00 2001 From: Srinivas Pandruvada Date: Sat, 23 Jul 2016 15:12:06 -0700 Subject: cpufreq: intel_pstate: Add more out-of-band IDs Add Skylake-X and Broadwell-X IDs for out-of-band (OBB) control of P-States. For these processors, if MSR_MISC_PWR_MGMT BIT(8) == 1, then the Intel P-State driver should exit as OS can't control P-States. Signed-off-by: Srinivas Pandruvada [ rjw : Subject/changelog ] Signed-off-by: Rafael J. Wysocki --- drivers/cpufreq/intel_pstate.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/cpufreq/intel_pstate.c b/drivers/cpufreq/intel_pstate.c index d8028def199d..b5cafb73c59a 100644 --- a/drivers/cpufreq/intel_pstate.c +++ b/drivers/cpufreq/intel_pstate.c @@ -1374,6 +1374,8 @@ MODULE_DEVICE_TABLE(x86cpu, intel_pstate_cpu_ids); static const struct x86_cpu_id intel_pstate_cpu_oob_ids[] __initconst = { ICPU(INTEL_FAM6_BROADWELL_XEON_D, core_params), + ICPU(INTEL_FAM6_BROADWELL_X, core_params), + ICPU(INTEL_FAM6_SKYLAKE_X, core_params), {} }; -- cgit v1.2.3-58-ga151 From 79ad70de539c58883098f9f4ed6312dd7f6c2fef Mon Sep 17 00:00:00 2001 From: Borislav Petkov Date: Mon, 1 Aug 2016 11:34:55 +0200 Subject: cpufreq: Do not default-yes CPU_FREQ_STAT CPU frequency transition statistics are not absolutely required for proper cpufreq operation on the system AFAICT so remove the default-yes setting in Kconfig. Signed-off-by: Borislav Petkov Acked-by: Viresh Kumar Signed-off-by: Rafael J. Wysocki --- drivers/cpufreq/Kconfig | 1 - 1 file changed, 1 deletion(-) diff --git a/drivers/cpufreq/Kconfig b/drivers/cpufreq/Kconfig index c822d72629d5..74919aa81dcb 100644 --- a/drivers/cpufreq/Kconfig +++ b/drivers/cpufreq/Kconfig @@ -32,7 +32,6 @@ config CPU_FREQ_BOOST_SW config CPU_FREQ_STAT bool "CPU frequency transition statistics" - default y help Export CPU frequency statistics information through sysfs. -- cgit v1.2.3-58-ga151 From c226fab474291e3c6ac5fa30a2b0778acc311e61 Mon Sep 17 00:00:00 2001 From: "Rafael J. Wysocki" Date: Wed, 3 Aug 2016 01:19:26 +0200 Subject: x86/power/64: Do not refer to __PAGE_OFFSET from assembly code When CONFIG_RANDOMIZE_MEMORY is set on x86-64, __PAGE_OFFSET becomes a variable and using it as a symbol in the image memory restoration assembly code under core_restore_code is not correct any more. To avoid that problem, modify set_up_temporary_mappings() to compute the physical address of the temporary page tables and store it in temp_level4_pgt, so that the value of that variable is ready to be written into CR3. Then, the assembly code doesn't have to worry about converting that value into a physical address and things work regardless of whether or not CONFIG_RANDOMIZE_MEMORY is set. Reported-and-tested-by: Thomas Garnier Signed-off-by: Rafael J. Wysocki --- arch/x86/power/hibernate_64.c | 18 +++++++++--------- arch/x86/power/hibernate_asm_64.S | 2 -- 2 files changed, 9 insertions(+), 11 deletions(-) diff --git a/arch/x86/power/hibernate_64.c b/arch/x86/power/hibernate_64.c index f2b5e6a5cf95..f0b5f2d402af 100644 --- a/arch/x86/power/hibernate_64.c +++ b/arch/x86/power/hibernate_64.c @@ -37,11 +37,11 @@ unsigned long jump_address_phys; */ unsigned long restore_cr3 __visible; -pgd_t *temp_level4_pgt __visible; +unsigned long temp_level4_pgt __visible; unsigned long relocated_restore_code __visible; -static int set_up_temporary_text_mapping(void) +static int set_up_temporary_text_mapping(pgd_t *pgd) { pmd_t *pmd; pud_t *pud; @@ -71,7 +71,7 @@ static int set_up_temporary_text_mapping(void) __pmd((jump_address_phys & PMD_MASK) | __PAGE_KERNEL_LARGE_EXEC)); set_pud(pud + pud_index(restore_jump_address), __pud(__pa(pmd) | _KERNPG_TABLE)); - set_pgd(temp_level4_pgt + pgd_index(restore_jump_address), + set_pgd(pgd + pgd_index(restore_jump_address), __pgd(__pa(pud) | _KERNPG_TABLE)); return 0; @@ -90,15 +90,16 @@ static int set_up_temporary_mappings(void) .kernel_mapping = true, }; unsigned long mstart, mend; + pgd_t *pgd; int result; int i; - temp_level4_pgt = (pgd_t *)get_safe_page(GFP_ATOMIC); - if (!temp_level4_pgt) + pgd = (pgd_t *)get_safe_page(GFP_ATOMIC); + if (!pgd) return -ENOMEM; /* Prepare a temporary mapping for the kernel text */ - result = set_up_temporary_text_mapping(); + result = set_up_temporary_text_mapping(pgd); if (result) return result; @@ -107,13 +108,12 @@ static int set_up_temporary_mappings(void) mstart = pfn_mapped[i].start << PAGE_SHIFT; mend = pfn_mapped[i].end << PAGE_SHIFT; - result = kernel_ident_mapping_init(&info, temp_level4_pgt, - mstart, mend); - + result = kernel_ident_mapping_init(&info, pgd, mstart, mend); if (result) return result; } + temp_level4_pgt = (unsigned long)pgd - __PAGE_OFFSET; return 0; } diff --git a/arch/x86/power/hibernate_asm_64.S b/arch/x86/power/hibernate_asm_64.S index 8eee0e9c93f0..ce8da3a0412c 100644 --- a/arch/x86/power/hibernate_asm_64.S +++ b/arch/x86/power/hibernate_asm_64.S @@ -72,8 +72,6 @@ ENTRY(restore_image) /* code below has been relocated to a safe page */ ENTRY(core_restore_code) /* switch to temporary page tables */ - movq $__PAGE_OFFSET, %rcx - subq %rcx, %rax movq %rax, %cr3 /* flush TLB */ movq %rbx, %rcx -- cgit v1.2.3-58-ga151