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author | Linus Torvalds <torvalds@linux-foundation.org> | 2016-07-29 13:55:30 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2016-07-29 13:55:30 -0700 |
commit | a6408f6cb63ac0958fee7dbce7861ffb540d8a49 (patch) | |
tree | c94a835d343974171951e3b805e6bbbb02852ebc /drivers/hwtracing | |
parent | 1a81a8f2a5918956e214bb718099a89e500e7ec5 (diff) | |
parent | 4fae16dffb812f0e0d98a0b2b0856ca48ca63e6c (diff) | |
download | blackbird-op-linux-a6408f6cb63ac0958fee7dbce7861ffb540d8a49.tar.gz blackbird-op-linux-a6408f6cb63ac0958fee7dbce7861ffb540d8a49.zip |
Merge branch 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull smp hotplug updates from Thomas Gleixner:
"This is the next part of the hotplug rework.
- Convert all notifiers with a priority assigned
- Convert all CPU_STARTING/DYING notifiers
The final removal of the STARTING/DYING infrastructure will happen
when the merge window closes.
Another 700 hundred line of unpenetrable maze gone :)"
* 'smp-hotplug-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (70 commits)
timers/core: Correct callback order during CPU hot plug
leds/trigger/cpu: Move from CPU_STARTING to ONLINE level
powerpc/numa: Convert to hotplug state machine
arm/perf: Fix hotplug state machine conversion
irqchip/armada: Avoid unused function warnings
ARC/time: Convert to hotplug state machine
clocksource/atlas7: Convert to hotplug state machine
clocksource/armada-370-xp: Convert to hotplug state machine
clocksource/exynos_mct: Convert to hotplug state machine
clocksource/arm_global_timer: Convert to hotplug state machine
rcu: Convert rcutree to hotplug state machine
KVM/arm/arm64/vgic-new: Convert to hotplug state machine
smp/cfd: Convert core to hotplug state machine
x86/x2apic: Convert to CPU hotplug state machine
profile: Convert to hotplug state machine
timers/core: Convert to hotplug state machine
hrtimer: Convert to hotplug state machine
x86/tboot: Convert to hotplug state machine
arm64/armv8 deprecated: Convert to hotplug state machine
hwtracing/coresight-etm4x: Convert to hotplug state machine
...
Diffstat (limited to 'drivers/hwtracing')
-rw-r--r-- | drivers/hwtracing/coresight/coresight-etm3x.c | 90 | ||||
-rw-r--r-- | drivers/hwtracing/coresight/coresight-etm4x.c | 87 |
2 files changed, 98 insertions, 79 deletions
diff --git a/drivers/hwtracing/coresight/coresight-etm3x.c b/drivers/hwtracing/coresight/coresight-etm3x.c index d83ab82672e4..2de4cad9c5ed 100644 --- a/drivers/hwtracing/coresight/coresight-etm3x.c +++ b/drivers/hwtracing/coresight/coresight-etm3x.c @@ -51,6 +51,8 @@ module_param_named(boot_enable, boot_enable, int, S_IRUGO); static int etm_count; static struct etm_drvdata *etmdrvdata[NR_CPUS]; +static enum cpuhp_state hp_online; + /* * Memory mapped writes to clear os lock are not supported on some processors * and OS lock must be unlocked before any memory mapped access on such @@ -481,8 +483,7 @@ static int etm_enable_sysfs(struct coresight_device *csdev) /* * Configure the ETM only if the CPU is online. If it isn't online - * hw configuration will take place when 'CPU_STARTING' is received - * in @etm_cpu_callback. + * hw configuration will take place on the local CPU during bring up. */ if (cpu_online(drvdata->cpu)) { ret = smp_call_function_single(drvdata->cpu, @@ -641,47 +642,44 @@ static const struct coresight_ops etm_cs_ops = { .source_ops = &etm_source_ops, }; -static int etm_cpu_callback(struct notifier_block *nfb, unsigned long action, - void *hcpu) +static int etm_online_cpu(unsigned int cpu) { - unsigned int cpu = (unsigned long)hcpu; - if (!etmdrvdata[cpu]) - goto out; + return 0; - switch (action & (~CPU_TASKS_FROZEN)) { - case CPU_STARTING: - spin_lock(&etmdrvdata[cpu]->spinlock); - if (!etmdrvdata[cpu]->os_unlock) { - etm_os_unlock(etmdrvdata[cpu]); - etmdrvdata[cpu]->os_unlock = true; - } - - if (local_read(&etmdrvdata[cpu]->mode)) - etm_enable_hw(etmdrvdata[cpu]); - spin_unlock(&etmdrvdata[cpu]->spinlock); - break; + if (etmdrvdata[cpu]->boot_enable && !etmdrvdata[cpu]->sticky_enable) + coresight_enable(etmdrvdata[cpu]->csdev); + return 0; +} - case CPU_ONLINE: - if (etmdrvdata[cpu]->boot_enable && - !etmdrvdata[cpu]->sticky_enable) - coresight_enable(etmdrvdata[cpu]->csdev); - break; +static int etm_starting_cpu(unsigned int cpu) +{ + if (!etmdrvdata[cpu]) + return 0; - case CPU_DYING: - spin_lock(&etmdrvdata[cpu]->spinlock); - if (local_read(&etmdrvdata[cpu]->mode)) - etm_disable_hw(etmdrvdata[cpu]); - spin_unlock(&etmdrvdata[cpu]->spinlock); - break; + spin_lock(&etmdrvdata[cpu]->spinlock); + if (!etmdrvdata[cpu]->os_unlock) { + etm_os_unlock(etmdrvdata[cpu]); + etmdrvdata[cpu]->os_unlock = true; } -out: - return NOTIFY_OK; + + if (local_read(&etmdrvdata[cpu]->mode)) + etm_enable_hw(etmdrvdata[cpu]); + spin_unlock(&etmdrvdata[cpu]->spinlock); + return 0; } -static struct notifier_block etm_cpu_notifier = { - .notifier_call = etm_cpu_callback, -}; +static int etm_dying_cpu(unsigned int cpu) +{ + if (!etmdrvdata[cpu]) + return 0; + + spin_lock(&etmdrvdata[cpu]->spinlock); + if (local_read(&etmdrvdata[cpu]->mode)) + etm_disable_hw(etmdrvdata[cpu]); + spin_unlock(&etmdrvdata[cpu]->spinlock); + return 0; +} static bool etm_arch_supported(u8 arch) { @@ -806,9 +804,17 @@ static int etm_probe(struct amba_device *adev, const struct amba_id *id) etm_init_arch_data, drvdata, 1)) dev_err(dev, "ETM arch init failed\n"); - if (!etm_count++) - register_hotcpu_notifier(&etm_cpu_notifier); - + if (!etm_count++) { + cpuhp_setup_state_nocalls(CPUHP_AP_ARM_CORESIGHT_STARTING, + "AP_ARM_CORESIGHT_STARTING", + etm_starting_cpu, etm_dying_cpu); + ret = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN, + "AP_ARM_CORESIGHT_ONLINE", + etm_online_cpu, NULL); + if (ret < 0) + goto err_arch_supported; + hp_online = ret; + } put_online_cpus(); if (etm_arch_supported(drvdata->arch) == false) { @@ -839,7 +845,6 @@ static int etm_probe(struct amba_device *adev, const struct amba_id *id) pm_runtime_put(&adev->dev); dev_info(dev, "%s initialized\n", (char *)id->data); - if (boot_enable) { coresight_enable(drvdata->csdev); drvdata->boot_enable = true; @@ -848,8 +853,11 @@ static int etm_probe(struct amba_device *adev, const struct amba_id *id) return 0; err_arch_supported: - if (--etm_count == 0) - unregister_hotcpu_notifier(&etm_cpu_notifier); + if (--etm_count == 0) { + cpuhp_remove_state_nocalls(CPUHP_AP_ARM_CORESIGHT_STARTING); + if (hp_online) + cpuhp_remove_state_nocalls(hp_online); + } return ret; } diff --git a/drivers/hwtracing/coresight/coresight-etm4x.c b/drivers/hwtracing/coresight/coresight-etm4x.c index 462f0dc15757..1a5e0d14c1dd 100644 --- a/drivers/hwtracing/coresight/coresight-etm4x.c +++ b/drivers/hwtracing/coresight/coresight-etm4x.c @@ -48,6 +48,8 @@ static int etm4_count; static struct etmv4_drvdata *etmdrvdata[NR_CPUS]; static void etm4_set_default(struct etmv4_config *config); +static enum cpuhp_state hp_online; + static void etm4_os_unlock(struct etmv4_drvdata *drvdata) { /* Writing any value to ETMOSLAR unlocks the trace registers */ @@ -673,47 +675,44 @@ void etm4_config_trace_mode(struct etmv4_config *config) config->addr_acc[ETM_DEFAULT_ADDR_COMP + 1] = addr_acc; } -static int etm4_cpu_callback(struct notifier_block *nfb, unsigned long action, - void *hcpu) +static int etm4_online_cpu(unsigned int cpu) { - unsigned int cpu = (unsigned long)hcpu; - if (!etmdrvdata[cpu]) - goto out; - - switch (action & (~CPU_TASKS_FROZEN)) { - case CPU_STARTING: - spin_lock(&etmdrvdata[cpu]->spinlock); - if (!etmdrvdata[cpu]->os_unlock) { - etm4_os_unlock(etmdrvdata[cpu]); - etmdrvdata[cpu]->os_unlock = true; - } - - if (local_read(&etmdrvdata[cpu]->mode)) - etm4_enable_hw(etmdrvdata[cpu]); - spin_unlock(&etmdrvdata[cpu]->spinlock); - break; + return 0; - case CPU_ONLINE: - if (etmdrvdata[cpu]->boot_enable && - !etmdrvdata[cpu]->sticky_enable) - coresight_enable(etmdrvdata[cpu]->csdev); - break; + if (etmdrvdata[cpu]->boot_enable && !etmdrvdata[cpu]->sticky_enable) + coresight_enable(etmdrvdata[cpu]->csdev); + return 0; +} - case CPU_DYING: - spin_lock(&etmdrvdata[cpu]->spinlock); - if (local_read(&etmdrvdata[cpu]->mode)) - etm4_disable_hw(etmdrvdata[cpu]); - spin_unlock(&etmdrvdata[cpu]->spinlock); - break; +static int etm4_starting_cpu(unsigned int cpu) +{ + if (!etmdrvdata[cpu]) + return 0; + + spin_lock(&etmdrvdata[cpu]->spinlock); + if (!etmdrvdata[cpu]->os_unlock) { + etm4_os_unlock(etmdrvdata[cpu]); + etmdrvdata[cpu]->os_unlock = true; } -out: - return NOTIFY_OK; + + if (local_read(&etmdrvdata[cpu]->mode)) + etm4_enable_hw(etmdrvdata[cpu]); + spin_unlock(&etmdrvdata[cpu]->spinlock); + return 0; } -static struct notifier_block etm4_cpu_notifier = { - .notifier_call = etm4_cpu_callback, -}; +static int etm4_dying_cpu(unsigned int cpu) +{ + if (!etmdrvdata[cpu]) + return 0; + + spin_lock(&etmdrvdata[cpu]->spinlock); + if (local_read(&etmdrvdata[cpu]->mode)) + etm4_disable_hw(etmdrvdata[cpu]); + spin_unlock(&etmdrvdata[cpu]->spinlock); + return 0; +} static void etm4_init_trace_id(struct etmv4_drvdata *drvdata) { @@ -767,8 +766,17 @@ static int etm4_probe(struct amba_device *adev, const struct amba_id *id) etm4_init_arch_data, drvdata, 1)) dev_err(dev, "ETM arch init failed\n"); - if (!etm4_count++) - register_hotcpu_notifier(&etm4_cpu_notifier); + if (!etm4_count++) { + cpuhp_setup_state_nocalls(CPUHP_AP_ARM_CORESIGHT4_STARTING, + "AP_ARM_CORESIGHT4_STARTING", + etm4_starting_cpu, etm4_dying_cpu); + ret = cpuhp_setup_state_nocalls(CPUHP_AP_ONLINE_DYN, + "AP_ARM_CORESIGHT4_ONLINE", + etm4_online_cpu, NULL); + if (ret < 0) + goto err_arch_supported; + hp_online = ret; + } put_online_cpus(); @@ -809,8 +817,11 @@ static int etm4_probe(struct amba_device *adev, const struct amba_id *id) return 0; err_arch_supported: - if (--etm4_count == 0) - unregister_hotcpu_notifier(&etm4_cpu_notifier); + if (--etm4_count == 0) { + cpuhp_remove_state_nocalls(CPUHP_AP_ARM_CORESIGHT4_STARTING); + if (hp_online) + cpuhp_remove_state_nocalls(hp_online); + } return ret; } |