diff options
Diffstat (limited to 'debian/patches-rt/0174-thermal-Defer-thermal-wakups-to-threads.patch')
| -rw-r--r-- | debian/patches-rt/0174-thermal-Defer-thermal-wakups-to-threads.patch | 137 |
1 files changed, 137 insertions, 0 deletions
diff --git a/debian/patches-rt/0174-thermal-Defer-thermal-wakups-to-threads.patch b/debian/patches-rt/0174-thermal-Defer-thermal-wakups-to-threads.patch new file mode 100644 index 000000000..87e9fc777 --- /dev/null +++ b/debian/patches-rt/0174-thermal-Defer-thermal-wakups-to-threads.patch @@ -0,0 +1,137 @@ +From add227c3c4d74e71f3d02036aed9c6ceae6a6f6c Mon Sep 17 00:00:00 2001 +From: Daniel Wagner <wagi@monom.org> +Date: Tue, 17 Feb 2015 09:37:44 +0100 +Subject: [PATCH 174/347] thermal: Defer thermal wakups to threads +Origin: https://www.kernel.org/pub/linux/kernel/projects/rt/4.19/older/patches-4.19.246-rt110.tar.xz + +On RT the spin lock in pkg_temp_thermal_platfrom_thermal_notify will +call schedule while we run in irq context. + +[<ffffffff816850ac>] dump_stack+0x4e/0x8f +[<ffffffff81680f7d>] __schedule_bug+0xa6/0xb4 +[<ffffffff816896b4>] __schedule+0x5b4/0x700 +[<ffffffff8168982a>] schedule+0x2a/0x90 +[<ffffffff8168a8b5>] rt_spin_lock_slowlock+0xe5/0x2d0 +[<ffffffff8168afd5>] rt_spin_lock+0x25/0x30 +[<ffffffffa03a7b75>] pkg_temp_thermal_platform_thermal_notify+0x45/0x134 [x86_pkg_temp_thermal] +[<ffffffff8103d4db>] ? therm_throt_process+0x1b/0x160 +[<ffffffff8103d831>] intel_thermal_interrupt+0x211/0x250 +[<ffffffff8103d8c1>] smp_thermal_interrupt+0x21/0x40 +[<ffffffff8169415d>] thermal_interrupt+0x6d/0x80 + +Let's defer the work to a kthread. + +Signed-off-by: Daniel Wagner <daniel.wagner@bmw-carit.de> +[bigeasy: reoder init/denit position. TODO: flush swork on exit] +Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de> +--- + drivers/thermal/x86_pkg_temp_thermal.c | 52 ++++++++++++++++++++++++-- + 1 file changed, 49 insertions(+), 3 deletions(-) + +diff --git a/drivers/thermal/x86_pkg_temp_thermal.c b/drivers/thermal/x86_pkg_temp_thermal.c +index 1ef937d799e4..a5991cbb408f 100644 +--- a/drivers/thermal/x86_pkg_temp_thermal.c ++++ b/drivers/thermal/x86_pkg_temp_thermal.c +@@ -29,6 +29,7 @@ + #include <linux/pm.h> + #include <linux/thermal.h> + #include <linux/debugfs.h> ++#include <linux/swork.h> + #include <asm/cpu_device_id.h> + #include <asm/mce.h> + +@@ -329,7 +330,7 @@ static void pkg_thermal_schedule_work(int cpu, struct delayed_work *work) + schedule_delayed_work_on(cpu, work, ms); + } + +-static int pkg_thermal_notify(u64 msr_val) ++static void pkg_thermal_notify_work(struct swork_event *event) + { + int cpu = smp_processor_id(); + struct pkg_device *pkgdev; +@@ -348,9 +349,47 @@ static int pkg_thermal_notify(u64 msr_val) + } + + spin_unlock_irqrestore(&pkg_temp_lock, flags); ++} ++ ++#ifdef CONFIG_PREEMPT_RT_FULL ++static struct swork_event notify_work; ++ ++static int pkg_thermal_notify_work_init(void) ++{ ++ int err; ++ ++ err = swork_get(); ++ if (err) ++ return err; ++ ++ INIT_SWORK(¬ify_work, pkg_thermal_notify_work); + return 0; + } + ++static void pkg_thermal_notify_work_cleanup(void) ++{ ++ swork_put(); ++} ++ ++static int pkg_thermal_notify(u64 msr_val) ++{ ++ swork_queue(¬ify_work); ++ return 0; ++} ++ ++#else /* !CONFIG_PREEMPT_RT_FULL */ ++ ++static int pkg_thermal_notify_work_init(void) { return 0; } ++ ++static void pkg_thermal_notify_work_cleanup(void) { } ++ ++static int pkg_thermal_notify(u64 msr_val) ++{ ++ pkg_thermal_notify_work(NULL); ++ return 0; ++} ++#endif /* CONFIG_PREEMPT_RT_FULL */ ++ + static int pkg_temp_thermal_device_add(unsigned int cpu) + { + int pkgid = topology_logical_package_id(cpu); +@@ -515,11 +554,16 @@ static int __init pkg_temp_thermal_init(void) + if (!x86_match_cpu(pkg_temp_thermal_ids)) + return -ENODEV; + ++ if (!pkg_thermal_notify_work_init()) ++ return -ENODEV; ++ + max_packages = topology_max_packages(); + packages = kcalloc(max_packages, sizeof(struct pkg_device *), + GFP_KERNEL); +- if (!packages) +- return -ENOMEM; ++ if (!packages) { ++ ret = -ENOMEM; ++ goto err; ++ } + + ret = cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "thermal/x86_pkg:online", + pkg_thermal_cpu_online, pkg_thermal_cpu_offline); +@@ -537,6 +581,7 @@ static int __init pkg_temp_thermal_init(void) + return 0; + + err: ++ pkg_thermal_notify_work_cleanup(); + kfree(packages); + return ret; + } +@@ -550,6 +595,7 @@ static void __exit pkg_temp_thermal_exit(void) + cpuhp_remove_state(pkg_thermal_hp_state); + debugfs_remove_recursive(debugfs); + kfree(packages); ++ pkg_thermal_notify_work_cleanup(); + } + module_exit(pkg_temp_thermal_exit) + +-- +2.36.1 + |