> -----Original Message----- > From: linux-acpi-owner@xxxxxxxxxxxxxxx [mailto:linux-acpi- > owner@xxxxxxxxxxxxxxx] On Behalf Of Lv Zheng > Sent: Friday, September 29, 2017 10:50 AM > To: Wysocki, Rafael J <rafael.j.wysocki@xxxxxxxxx>; Rafael J . Wysocki > <rjw@xxxxxxxxxxxxx>; Brown, Len <len.brown@xxxxxxxxx> > Cc: Zheng, Lv <lv.zheng@xxxxxxxxx>; Lv Zheng <zetalog@xxxxxxxxx>; linux- > kernel@xxxxxxxxxxxxxxx; linux-acpi@xxxxxxxxxxxxxxx > Subject: [RFC PATCH v6 2/3] ACPI / EC: Add event detection support for noirq > stages > > This patch adds a timer to poll EC events: > 1. between acpi_ec_suspend() and acpi_ec_block_transactions(), 2. between > acpi_ec_unblock_transactions() and acpi_ec_resume(). > During these periods, if an EC event occurred, we have not mean to detect it. > Thus the events occurred in late S3-entry could be dropped, and the events > occurred in early S3-exit could be deferred to acpi_ec_resume(). > > This patch solves event losses in S3-entry and resume order in S3-exit by > timely polling EC events during these periods. > > Link: https://bugzilla.kernel.org/show_bug.cgi?id=196129 [#1] > Signed-off-by: Lv Zheng <lv.zheng@xxxxxxxxx> > Tested-by: Tomislav Ivek <tomislav.ivek@xxxxxxxxx> No, the patches to fix the Fan spin issue (https://bugzilla.kernel.org/show_bug.cgi?id=196129) have already been applied by Rafael. This patch, together with patch 3/3 don't fix anything. I'm not saying the patch is wrong, but they should be verified to fix a real issue before submitting for upstream. Thanks, rui > --- > drivers/acpi/ec.c | 93 > +++++++++++++++++++++++++++++++++++++++++++++++-- > drivers/acpi/internal.h | 1 + > 2 files changed, 92 insertions(+), 2 deletions(-) > > diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c index f1f320b..389c499 > 100644 > --- a/drivers/acpi/ec.c > +++ b/drivers/acpi/ec.c > @@ -40,6 +40,7 @@ > #include <linux/slab.h> > #include <linux/acpi.h> > #include <linux/dmi.h> > +#include <linux/timer.h> > #include <asm/io.h> > > #include "internal.h" > @@ -102,6 +103,7 @@ enum ec_command { > #define ACPI_EC_CLEAR_MAX 100 /* Maximum number of events to > query > * when trying to clear the EC */ > #define ACPI_EC_MAX_QUERIES 16 /* Maximum number of > parallel queries */ > +#define ACPI_EC_EVENT_INTERVAL 500 /* Detecting event every > 500ms */ > > enum { > EC_FLAGS_QUERY_ENABLED, /* Query is enabled */ > @@ -113,6 +115,7 @@ enum { > EC_FLAGS_STARTED, /* Driver is started */ > EC_FLAGS_STOPPED, /* Driver is stopped */ > EC_FLAGS_GPE_MASKED, /* GPE masked */ > + EC_FLAGS_GPE_POLLING, /* GPE polling is enabled */ > }; > > #define ACPI_EC_COMMAND_POLL 0x01 /* Available for > command byte */ > @@ -154,6 +157,15 @@ static bool ec_no_wakeup __read_mostly; > module_param(ec_no_wakeup, bool, 0644); > MODULE_PARM_DESC(ec_no_wakeup, "Do not wake up from suspend-to- > idle"); > > +static bool ec_detect_noirq_events __read_mostly; > +module_param(ec_detect_noirq_events, bool, 0644); > +MODULE_PARM_DESC(ec_detect_noirq_events, "Enabling event detection > +during noirq stage"); > + > +static unsigned int > +ec_detect_noirq_interval __read_mostly = ACPI_EC_EVENT_INTERVAL; > +module_param(ec_detect_noirq_interval, uint, 0644); > +MODULE_PARM_DESC(ec_detect_noirq_interval, "Event detection > +interval(ms) during noirq stage"); > + > struct acpi_ec_query_handler { > struct list_head node; > acpi_ec_query_func func; > @@ -358,6 +370,48 @@ static inline bool acpi_ec_is_gpe_raised(struct > acpi_ec *ec) > return (gpe_status & ACPI_EVENT_FLAG_STATUS_SET) ? true : false; } > > +static void acpi_ec_gpe_tick(struct acpi_ec *ec) { > + mod_timer(&ec->timer, > + jiffies + msecs_to_jiffies(ec_detect_noirq_interval)); > +} > + > +static void ec_start_gpe_poller(struct acpi_ec *ec) { > + unsigned long flags; > + bool start_tick = false; > + > + if (!acpi_ec_no_sleep_events() || !ec_detect_noirq_events) > + return; > + spin_lock_irqsave(&ec->lock, flags); > + if (!test_and_set_bit(EC_FLAGS_GPE_POLLING, &ec->flags)) { > + ec_log_drv("GPE poller started"); > + start_tick = true; > + /* kick off GPE polling without delay */ > + advance_transaction(ec); > + } > + spin_unlock_irqrestore(&ec->lock, flags); > + if (start_tick) > + acpi_ec_gpe_tick(ec); > +} > + > +static void ec_stop_gpe_poller(struct acpi_ec *ec) { > + unsigned long flags; > + bool stop_tick = false; > + > + if (!acpi_ec_no_sleep_events() || !ec_detect_noirq_events) > + return; > + spin_lock_irqsave(&ec->lock, flags); > + if (test_and_clear_bit(EC_FLAGS_GPE_POLLING, &ec->flags)) > + stop_tick = true; > + spin_unlock_irqrestore(&ec->lock, flags); > + if (stop_tick) { > + del_timer_sync(&ec->timer); > + ec_log_drv("GPE poller stopped"); > + } > +} > + > static inline void acpi_ec_enable_gpe(struct acpi_ec *ec, bool open) { > if (open) > @@ -1017,6 +1071,12 @@ static void acpi_ec_leave_noirq(struct acpi_ec > *ec) > spin_unlock_irqrestore(&ec->lock, flags); } > > +/* > + * Note: this API is prepared for tuning the order of the ACPI > + * suspend/resume steps as the last entry of EC during suspend, thus it > + * must be invoked after acpi_ec_suspend() or everything should be done > +in > + * acpi_ec_suspend(). > + */ > void acpi_ec_block_transactions(void) > { > struct acpi_ec *ec = first_ec; > @@ -1028,16 +1088,28 @@ void acpi_ec_block_transactions(void) > /* Prevent transactions from being carried out */ > acpi_ec_stop(ec, true); > mutex_unlock(&ec->mutex); > + ec_stop_gpe_poller(ec); > } > > +/* > + * Note: this API is prepared for tuning the order of the ACPI > + * suspend/resume steps as the first entry of EC during resume, thus it > + * must be invoked before acpi_ec_resume() or everything should be done > +in > + * acpi_ec_resume(). > + */ > void acpi_ec_unblock_transactions(void) > { > + struct acpi_ec *ec = first_ec; > + > + if (!ec) > + return; > + > + ec_start_gpe_poller(ec); > /* > * Allow transactions to happen again (this function is called from > * atomic context during wakeup, so we don't need to acquire the > mutex). > */ > - if (first_ec) > - acpi_ec_start(first_ec, true); > + acpi_ec_start(ec, true); > } > > /* -------------------------------------------------------------------------- > @@ -1278,6 +1350,19 @@ static u32 acpi_ec_gpe_handler(acpi_handle > gpe_device, > return ACPI_INTERRUPT_HANDLED; > } > > +static void acpi_ec_gpe_poller(ulong arg) { > + struct acpi_ec *ec = (struct acpi_ec *)arg; > + unsigned long flags; > + > + spin_lock_irqsave(&ec->lock, flags); > + ec_dbg_drv("GPE polling begin"); > + advance_transaction(ec); > + ec_dbg_drv("GPE polling end"); > + spin_unlock_irqrestore(&ec->lock, flags); > + acpi_ec_gpe_tick(ec); > +} > + > /* -------------------------------------------------------------------------- > * Address Space Management > * -------------------------------------------------------------------------- */ @@ -1347,6 > +1432,8 @@ static struct acpi_ec *acpi_ec_alloc(void) > INIT_LIST_HEAD(&ec->list); > spin_lock_init(&ec->lock); > INIT_WORK(&ec->work, acpi_ec_event_handler); > + init_timer(&ec->timer); > + setup_timer(&ec->timer, acpi_ec_gpe_poller, (ulong)ec); > ec->timestamp = jiffies; > ec->busy_polling = true; > ec->polling_guard = 0; > @@ -1918,6 +2005,7 @@ static int acpi_ec_suspend(struct device *dev) > > if (acpi_ec_no_sleep_events()) > acpi_ec_disable_event(ec); > + ec_start_gpe_poller(ec); > return 0; > } > > @@ -1952,6 +2040,7 @@ static int acpi_ec_resume(struct device *dev) > struct acpi_ec *ec = > acpi_driver_data(to_acpi_device(dev)); > > + ec_stop_gpe_poller(ec); > if (acpi_ec_no_sleep_events()) > acpi_ec_enable_event(ec); > else { > diff --git a/drivers/acpi/internal.h b/drivers/acpi/internal.h index > ede83d3..708b379 100644 > --- a/drivers/acpi/internal.h > +++ b/drivers/acpi/internal.h > @@ -171,6 +171,7 @@ struct acpi_ec { > struct transaction *curr; > spinlock_t lock; > struct work_struct work; > + struct timer_list timer; > unsigned long timestamp; > unsigned long nr_pending_queries; > bool busy_polling; > -- > 2.7.4 > > -- > To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the > body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at > http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
