diff options
Diffstat (limited to 'drivers/acpi/ec.c')
| -rw-r--r-- | drivers/acpi/ec.c | 1500 |
1 files changed, 889 insertions, 611 deletions
diff --git a/drivers/acpi/ec.c b/drivers/acpi/ec.c index 9d66a47d32fb..59b3d50ff01e 100644 --- a/drivers/acpi/ec.c +++ b/drivers/acpi/ec.c @@ -1,3 +1,4 @@ +// SPDX-License-Identifier: GPL-2.0-or-later /* * ec.c - ACPI Embedded Controller Driver (v3) * @@ -9,20 +10,6 @@ * 2001, 2002 Andy Grover <andrew.grover@intel.com> * 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com> * Copyright (C) 2008 Alexey Starikovskiy <astarikovskiy@suse.de> - * - * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or (at - * your option) any later version. - * - * This program is distributed in the hope that it will be useful, but - * WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - * General Public License for more details. - * - * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ */ /* Uncomment next line to get verbose printout */ @@ -36,8 +23,11 @@ #include <linux/delay.h> #include <linux/interrupt.h> #include <linux/list.h> +#include <linux/printk.h> #include <linux/spinlock.h> #include <linux/slab.h> +#include <linux/string.h> +#include <linux/suspend.h> #include <linux/acpi.h> #include <linux/dmi.h> #include <asm/io.h> @@ -46,7 +36,6 @@ #define ACPI_EC_CLASS "embedded_controller" #define ACPI_EC_DEVICE_NAME "Embedded Controller" -#define ACPI_EC_FILE_INFO "info" /* EC status register */ #define ACPI_EC_FLAG_OBF 0x01 /* Output buffer full */ @@ -105,14 +94,13 @@ enum ec_command { enum { EC_FLAGS_QUERY_ENABLED, /* Query is enabled */ - EC_FLAGS_QUERY_PENDING, /* Query is pending */ - EC_FLAGS_QUERY_GUARDING, /* Guard for SCI_EVT check */ - EC_FLAGS_GPE_HANDLER_INSTALLED, /* GPE handler installed */ + EC_FLAGS_EVENT_HANDLER_INSTALLED, /* Event handler installed */ EC_FLAGS_EC_HANDLER_INSTALLED, /* OpReg handler installed */ - EC_FLAGS_EVT_HANDLER_INSTALLED, /* _Qxx handlers installed */ + EC_FLAGS_EC_REG_CALLED, /* OpReg ACPI _REG method called */ + EC_FLAGS_QUERY_METHODS_INSTALLED, /* _Qxx handlers installed */ EC_FLAGS_STARTED, /* Driver is started */ EC_FLAGS_STOPPED, /* Driver is stopped */ - EC_FLAGS_GPE_MASKED, /* GPE masked */ + EC_FLAGS_EVENTS_MASKED, /* Events masked */ }; #define ACPI_EC_COMMAND_POLL 0x01 /* Available for command byte */ @@ -146,7 +134,7 @@ static unsigned int ec_storm_threshold __read_mostly = 8; module_param(ec_storm_threshold, uint, 0644); MODULE_PARM_DESC(ec_storm_threshold, "Maxim false GPE numbers not considered as GPE storm"); -static bool ec_freeze_events __read_mostly = false; +static bool ec_freeze_events __read_mostly; module_param(ec_freeze_events, bool, 0644); MODULE_PARM_DESC(ec_freeze_events, "Disabling event handling during suspend/resume"); @@ -179,21 +167,24 @@ struct acpi_ec_query { struct transaction transaction; struct work_struct work; struct acpi_ec_query_handler *handler; + struct acpi_ec *ec; }; -static int acpi_ec_query(struct acpi_ec *ec, u8 *data); -static void advance_transaction(struct acpi_ec *ec); +static int acpi_ec_submit_query(struct acpi_ec *ec); +static void advance_transaction(struct acpi_ec *ec, bool interrupt); static void acpi_ec_event_handler(struct work_struct *work); -static void acpi_ec_event_processor(struct work_struct *work); -struct acpi_ec *boot_ec, *first_ec; +struct acpi_ec *first_ec; EXPORT_SYMBOL(first_ec); -static bool boot_ec_is_ecdt = false; + +static struct acpi_ec *boot_ec; +static bool boot_ec_is_ecdt; +static struct workqueue_struct *ec_wq; static struct workqueue_struct *ec_query_wq; -static int EC_FLAGS_QUERY_HANDSHAKE; /* Needs QR_EC issued when SCI_EVT set */ static int EC_FLAGS_CORRECT_ECDT; /* Needs ECDT port address correction */ -static int EC_FLAGS_IGNORE_DSDT_GPE; /* Needs ECDT GPE as correction setting */ +static int EC_FLAGS_TRUST_DSDT_GPE; /* Needs DSDT GPE as correction setting */ +static int EC_FLAGS_CLEAR_ON_RESUME; /* Needs acpi_ec_clear() on boot/resume */ /* -------------------------------------------------------------------------- * Logging/Debugging @@ -345,12 +336,12 @@ static const char *acpi_ec_cmd_string(u8 cmd) * GPE Registers * -------------------------------------------------------------------------- */ -static inline bool acpi_ec_is_gpe_raised(struct acpi_ec *ec) +static inline bool acpi_ec_gpe_status_set(struct acpi_ec *ec) { acpi_event_status gpe_status = 0; (void)acpi_get_gpe_status(NULL, ec->gpe, &gpe_status); - return (gpe_status & ACPI_EVENT_FLAG_STATUS_SET) ? true : false; + return !!(gpe_status & ACPI_EVENT_FLAG_STATUS_SET); } static inline void acpi_ec_enable_gpe(struct acpi_ec *ec, bool open) @@ -361,14 +352,14 @@ static inline void acpi_ec_enable_gpe(struct acpi_ec *ec, bool open) BUG_ON(ec->reference_count < 1); acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_ENABLE); } - if (acpi_ec_is_gpe_raised(ec)) { + if (acpi_ec_gpe_status_set(ec)) { /* * On some platforms, EN=1 writes cannot trigger GPE. So * software need to manually trigger a pseudo GPE event on * EN=1 writes. */ ec_dbg_raw("Polling quirk"); - advance_transaction(ec); + advance_transaction(ec, false); } } @@ -382,23 +373,6 @@ static inline void acpi_ec_disable_gpe(struct acpi_ec *ec, bool close) } } -static inline void acpi_ec_clear_gpe(struct acpi_ec *ec) -{ - /* - * GPE STS is a W1C register, which means: - * 1. Software can clear it without worrying about clearing other - * GPEs' STS bits when the hardware sets them in parallel. - * 2. As long as software can ensure only clearing it when it is - * set, hardware won't set it in parallel. - * So software can clear GPE in any contexts. - * Warning: do not move the check into advance_transaction() as the - * EC commands will be sent without GPE raised. - */ - if (!acpi_ec_is_gpe_raised(ec)) - return; - acpi_clear_gpe(NULL, ec->gpe); -} - /* -------------------------------------------------------------------------- * Transaction Management * -------------------------------------------------------------------------- */ @@ -406,8 +380,8 @@ static inline void acpi_ec_clear_gpe(struct acpi_ec *ec) static void acpi_ec_submit_request(struct acpi_ec *ec) { ec->reference_count++; - if (test_bit(EC_FLAGS_GPE_HANDLER_INSTALLED, &ec->flags) && - ec->reference_count == 1) + if (test_bit(EC_FLAGS_EVENT_HANDLER_INSTALLED, &ec->flags) && + ec->gpe >= 0 && ec->reference_count == 1) acpi_ec_enable_gpe(ec, true); } @@ -416,28 +390,36 @@ static void acpi_ec_complete_request(struct acpi_ec *ec) bool flushed = false; ec->reference_count--; - if (test_bit(EC_FLAGS_GPE_HANDLER_INSTALLED, &ec->flags) && - ec->reference_count == 0) + if (test_bit(EC_FLAGS_EVENT_HANDLER_INSTALLED, &ec->flags) && + ec->gpe >= 0 && ec->reference_count == 0) acpi_ec_disable_gpe(ec, true); flushed = acpi_ec_flushed(ec); if (flushed) wake_up(&ec->wait); } -static void acpi_ec_mask_gpe(struct acpi_ec *ec) +static void acpi_ec_mask_events(struct acpi_ec *ec) { - if (!test_bit(EC_FLAGS_GPE_MASKED, &ec->flags)) { - acpi_ec_disable_gpe(ec, false); + if (!test_bit(EC_FLAGS_EVENTS_MASKED, &ec->flags)) { + if (ec->gpe >= 0) + acpi_ec_disable_gpe(ec, false); + else + disable_irq_nosync(ec->irq); + ec_dbg_drv("Polling enabled"); - set_bit(EC_FLAGS_GPE_MASKED, &ec->flags); + set_bit(EC_FLAGS_EVENTS_MASKED, &ec->flags); } } -static void acpi_ec_unmask_gpe(struct acpi_ec *ec) +static void acpi_ec_unmask_events(struct acpi_ec *ec) { - if (test_bit(EC_FLAGS_GPE_MASKED, &ec->flags)) { - clear_bit(EC_FLAGS_GPE_MASKED, &ec->flags); - acpi_ec_enable_gpe(ec, false); + if (test_bit(EC_FLAGS_EVENTS_MASKED, &ec->flags)) { + clear_bit(EC_FLAGS_EVENTS_MASKED, &ec->flags); + if (ec->gpe >= 0) + acpi_ec_enable_gpe(ec, false); + else + enable_irq(ec->irq); + ec_dbg_drv("Polling disabled"); } } @@ -461,25 +443,51 @@ static bool acpi_ec_submit_flushable_request(struct acpi_ec *ec) return true; } -static void acpi_ec_submit_query(struct acpi_ec *ec) +static void acpi_ec_submit_event(struct acpi_ec *ec) { - acpi_ec_mask_gpe(ec); + /* + * It is safe to mask the events here, because acpi_ec_close_event() + * will run at least once after this. + */ + acpi_ec_mask_events(ec); if (!acpi_ec_event_enabled(ec)) return; - if (!test_and_set_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) { - ec_dbg_evt("Command(%s) submitted/blocked", - acpi_ec_cmd_string(ACPI_EC_COMMAND_QUERY)); - ec->nr_pending_queries++; - schedule_work(&ec->work); - } + + if (ec->event_state != EC_EVENT_READY) + return; + + ec_dbg_evt("Command(%s) submitted/blocked", + acpi_ec_cmd_string(ACPI_EC_COMMAND_QUERY)); + + ec->event_state = EC_EVENT_IN_PROGRESS; + /* + * If events_to_process is greater than 0 at this point, the while () + * loop in acpi_ec_event_handler() is still running and incrementing + * events_to_process will cause it to invoke acpi_ec_submit_query() once + * more, so it is not necessary to queue up the event work to start the + * same loop again. + */ + if (ec->events_to_process++ > 0) + return; + + ec->events_in_progress++; + queue_work(ec_wq, &ec->work); } -static void acpi_ec_complete_query(struct acpi_ec *ec) +static void acpi_ec_complete_event(struct acpi_ec *ec) { - if (test_and_clear_bit(EC_FLAGS_QUERY_PENDING, &ec->flags)) + if (ec->event_state == EC_EVENT_IN_PROGRESS) + ec->event_state = EC_EVENT_COMPLETE; +} + +static void acpi_ec_close_event(struct acpi_ec *ec) +{ + if (ec->event_state != EC_EVENT_READY) ec_dbg_evt("Command(%s) unblocked", acpi_ec_cmd_string(ACPI_EC_COMMAND_QUERY)); - acpi_ec_unmask_gpe(ec); + + ec->event_state = EC_EVENT_READY; + acpi_ec_unmask_events(ec); } static inline void __acpi_ec_enable_event(struct acpi_ec *ec) @@ -490,7 +498,7 @@ static inline void __acpi_ec_enable_event(struct acpi_ec *ec) * Unconditionally invoke this once after enabling the event * handling mechanism to detect the pending events. */ - advance_transaction(ec); + advance_transaction(ec, false); } static inline void __acpi_ec_disable_event(struct acpi_ec *ec) @@ -499,37 +507,43 @@ static inline void __acpi_ec_disable_event(struct acpi_ec *ec) ec_log_drv("event blocked"); } -static void acpi_ec_enable_event(struct acpi_ec *ec) +/* + * Process _Q events that might have accumulated in the EC. + * Run with locked ec mutex. + */ +static void acpi_ec_clear(struct acpi_ec *ec) { - unsigned long flags; + int i; - spin_lock_irqsave(&ec->lock, flags); - if (acpi_ec_started(ec)) - __acpi_ec_enable_event(ec); - spin_unlock_irqrestore(&ec->lock, flags); + for (i = 0; i < ACPI_EC_CLEAR_MAX; i++) { + if (acpi_ec_submit_query(ec)) + break; + } + if (unlikely(i == ACPI_EC_CLEAR_MAX)) + pr_warn("Warning: Maximum of %d stale EC events cleared\n", i); + else + pr_info("%d stale EC events cleared\n", i); } -#ifdef CONFIG_PM_SLEEP -static bool acpi_ec_query_flushed(struct acpi_ec *ec) +static void acpi_ec_enable_event(struct acpi_ec *ec) { - bool flushed; unsigned long flags; spin_lock_irqsave(&ec->lock, flags); - flushed = !ec->nr_pending_queries; + if (acpi_ec_started(ec)) + __acpi_ec_enable_event(ec); spin_unlock_irqrestore(&ec->lock, flags); - return flushed; + + /* Drain additional events if hardware requires that */ + if (EC_FLAGS_CLEAR_ON_RESUME) + acpi_ec_clear(ec); } -static void __acpi_ec_flush_event(struct acpi_ec *ec) +#ifdef CONFIG_PM_SLEEP +static void __acpi_ec_flush_work(void) { - /* - * When ec_freeze_events is true, we need to flush events in - * the proper position before entering the noirq stage. - */ - wait_event(ec->wait, acpi_ec_query_flushed(ec)); - if (ec_query_wq) - flush_workqueue(ec_query_wq); + flush_workqueue(ec_wq); /* flush ec->work */ + flush_workqueue(ec_query_wq); /* flush queries */ } static void acpi_ec_disable_event(struct acpi_ec *ec) @@ -539,22 +553,28 @@ static void acpi_ec_disable_event(struct acpi_ec *ec) spin_lock_irqsave(&ec->lock, flags); __acpi_ec_disable_event(ec); spin_unlock_irqrestore(&ec->lock, flags); - __acpi_ec_flush_event(ec); + + /* + * When ec_freeze_events is true, we need to flush events in + * the proper position before entering the noirq stage. + */ + __acpi_ec_flush_work(); } void acpi_ec_flush_work(void) { - if (first_ec) - __acpi_ec_flush_event(first_ec); + /* Without ec_wq there is nothing to flush. */ + if (!ec_wq) + return; - flush_scheduled_work(); + __acpi_ec_flush_work(); } #endif /* CONFIG_PM_SLEEP */ static bool acpi_ec_guard_event(struct acpi_ec *ec) { - bool guarded = true; unsigned long flags; + bool guarded; spin_lock_irqsave(&ec->lock, flags); /* @@ -563,19 +583,15 @@ static bool acpi_ec_guard_event(struct acpi_ec *ec) * evaluating _Qxx, so we need to re-check SCI_EVT after waiting an * acceptable period. * - * The guarding period begins when EC_FLAGS_QUERY_PENDING is - * flagged, which means SCI_EVT check has just been performed. - * But if the current transaction is ACPI_EC_COMMAND_QUERY, the - * guarding should have already been performed (via - * EC_FLAGS_QUERY_GUARDING) and should not be applied so that the - * ACPI_EC_COMMAND_QUERY transaction can be transitioned into - * ACPI_EC_COMMAND_POLL state immediately. + * The guarding period is applicable if the event state is not + * EC_EVENT_READY, but otherwise if the current transaction is of the + * ACPI_EC_COMMAND_QUERY type, the guarding should have elapsed already + * and it should not be applied to let the transaction transition into + * the ACPI_EC_COMMAND_POLL state immediately. */ - if (ec_event_clearing == ACPI_EC_EVT_TIMING_STATUS || - ec_event_clearing == ACPI_EC_EVT_TIMING_QUERY || - !test_bit(EC_FLAGS_QUERY_PENDING, &ec->flags) || - (ec->curr && ec->curr->command == ACPI_EC_COMMAND_QUERY)) - guarded = false; + guarded = ec_event_clearing == ACPI_EC_EVT_TIMING_EVENT && + ec->event_state != EC_EVENT_READY && + (!ec->curr || ec->curr->command != ACPI_EC_COMMAND_QUERY); spin_unlock_irqrestore(&ec->lock, flags); return guarded; } @@ -607,108 +623,95 @@ static int ec_transaction_completed(struct acpi_ec *ec) static inline void ec_transaction_transition(struct acpi_ec *ec, unsigned long flag) { ec->curr->flags |= flag; - if (ec->curr->command == ACPI_EC_COMMAND_QUERY) { - if (ec_event_clearing == ACPI_EC_EVT_TIMING_STATUS && - flag == ACPI_EC_COMMAND_POLL) - acpi_ec_complete_query(ec); - if (ec_event_clearing == ACPI_EC_EVT_TIMING_QUERY && - flag == ACPI_EC_COMMAND_COMPLETE) - acpi_ec_complete_query(ec); - if (ec_event_clearing == ACPI_EC_EVT_TIMING_EVENT && - flag == ACPI_EC_COMMAND_COMPLETE) - set_bit(EC_FLAGS_QUERY_GUARDING, &ec->flags); + + if (ec->curr->command != ACPI_EC_COMMAND_QUERY) + return; + + switch (ec_event_clearing) { + case ACPI_EC_EVT_TIMING_STATUS: + if (flag == ACPI_EC_COMMAND_POLL) + acpi_ec_close_event(ec); + + return; + + case ACPI_EC_EVT_TIMING_QUERY: + if (flag == ACPI_EC_COMMAND_COMPLETE) + acpi_ec_close_event(ec); + + return; + + case ACPI_EC_EVT_TIMING_EVENT: + if (flag == ACPI_EC_COMMAND_COMPLETE) + acpi_ec_complete_event(ec); } } -static void advance_transaction(struct acpi_ec *ec) +static void acpi_ec_spurious_interrupt(struct acpi_ec *ec, struct transaction *t) { - struct transaction *t; - u8 status; + if (t->irq_count < ec_storm_threshold) + ++t->irq_count; + + /* Trigger if the threshold is 0 too. */ + if (t->irq_count == ec_storm_threshold) + acpi_ec_mask_events(ec); +} + +static void advance_transaction(struct acpi_ec *ec, bool interrupt) +{ + struct transaction *t = ec->curr; bool wakeup = false; + u8 status; + + ec_dbg_stm("%s (%d)", interrupt ? "IRQ" : "TASK", smp_processor_id()); - ec_dbg_stm("%s (%d)", in_interrupt() ? "IRQ" : "TASK", - smp_processor_id()); - /* - * By always clearing STS before handling all indications, we can - * ensure a hardware STS 0->1 change after this clearing can always - * trigger a GPE interrupt. - */ - acpi_ec_clear_gpe(ec); status = acpi_ec_read_status(ec); - t = ec->curr; + /* * Another IRQ or a guarded polling mode advancement is detected, * the next QR_EC submission is then allowed. */ if (!t || !(t->flags & ACPI_EC_COMMAND_POLL)) { if (ec_event_clearing == ACPI_EC_EVT_TIMING_EVENT && - (!ec->nr_pending_queries || - test_bit(EC_FLAGS_QUERY_GUARDING, &ec->flags))) { - clear_bit(EC_FLAGS_QUERY_GUARDING, &ec->flags); - acpi_ec_complete_query(ec); - } + ec->event_state == EC_EVENT_COMPLETE) + acpi_ec_close_event(ec); + + if (!t) + goto out; } - if (!t) - goto err; + if (t->flags & ACPI_EC_COMMAND_POLL) { if (t->wlen > t->wi) { - if ((status & ACPI_EC_FLAG_IBF) == 0) + if (!(status & ACPI_EC_FLAG_IBF)) acpi_ec_write_data(ec, t->wdata[t->wi++]); - else - goto err; + else if (interrupt && !(status & ACPI_EC_FLAG_SCI)) + acpi_ec_spurious_interrupt(ec, t); } else if (t->rlen > t->ri) { - if ((status & ACPI_EC_FLAG_OBF) == 1) { + if (status & ACPI_EC_FLAG_OBF) { t->rdata[t->ri++] = acpi_ec_read_data(ec); if (t->rlen == t->ri) { ec_transaction_transition(ec, ACPI_EC_COMMAND_COMPLETE); + wakeup = true; if (t->command == ACPI_EC_COMMAND_QUERY) ec_dbg_evt("Command(%s) completed by hardware", acpi_ec_cmd_string(ACPI_EC_COMMAND_QUERY)); - wakeup = true; } - } else - goto err; - } else if (t->wlen == t->wi && - (status & ACPI_EC_FLAG_IBF) == 0) { - ec_transaction_transition(ec, ACPI_EC_COMMAND_COMPLETE); - wakeup = true; - } - goto out; - } else { - if (EC_FLAGS_QUERY_HANDSHAKE && - !(status & ACPI_EC_FLAG_SCI) && - (t->command == ACPI_EC_COMMAND_QUERY)) { - ec_transaction_transition(ec, ACPI_EC_COMMAND_POLL); - t->rdata[t->ri++] = 0x00; + } else if (interrupt && !(status & ACPI_EC_FLAG_SCI)) { + acpi_ec_spurious_interrupt(ec, t); + } + } else if (t->wlen == t->wi && !(status & ACPI_EC_FLAG_IBF)) { ec_transaction_transition(ec, ACPI_EC_COMMAND_COMPLETE); - ec_dbg_evt("Command(%s) completed by software", - acpi_ec_cmd_string(ACPI_EC_COMMAND_QUERY)); wakeup = true; - } else if ((status & ACPI_EC_FLAG_IBF) == 0) { - acpi_ec_write_cmd(ec, t->command); - ec_transaction_transition(ec, ACPI_EC_COMMAND_POLL); - } else - goto err; - goto out; - } -err: - /* - * If SCI bit is set, then don't think it's a false IRQ - * otherwise will take a not handled IRQ as a false one. - */ - if (!(status & ACPI_EC_FLAG_SCI)) { - if (in_interrupt() && t) { - if (t->irq_count < ec_storm_threshold) - ++t->irq_count; - /* Allow triggering on 0 threshold */ - if (t->irq_count == ec_storm_threshold) - acpi_ec_mask_gpe(ec); } + } else if (!(status & ACPI_EC_FLAG_IBF)) { + acpi_ec_write_cmd(ec, t->command); + ec_transaction_transition(ec, ACPI_EC_COMMAND_POLL); } + out: if (status & ACPI_EC_FLAG_SCI) - acpi_ec_submit_query(ec); - if (wakeup && in_interrupt()) + acpi_ec_submit_event(ec); + + if (wakeup && interrupt) wake_up(&ec->wait); } @@ -765,7 +768,7 @@ static int ec_poll(struct acpi_ec *ec) if (!ec_guard(ec)) return 0; spin_lock_irqsave(&ec->lock, flags); - advance_transaction(ec); + advance_transaction(ec, false); spin_unlock_irqrestore(&ec->lock, flags); } while (time_before(jiffies, delay)); pr_debug("controller reset, restart transaction\n"); @@ -782,6 +785,9 @@ static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, unsigned long tmp; int ret = 0; + if (t->rdata) + memset(t->rdata, 0, t->rlen); + /* start transaction */ spin_lock_irqsave(&ec->lock, tmp); /* Enable GPE for command processing (IBF=0/OBF=1) */ @@ -800,7 +806,7 @@ static int acpi_ec_transaction_unlocked(struct acpi_ec *ec, spin_lock_irqsave(&ec->lock, tmp); if (t->irq_count == ec_storm_threshold) - acpi_ec_unmask_gpe(ec); + acpi_ec_unmask_events(ec); ec_dbg_req("Command(%s) stopped", acpi_ec_cmd_string(t->command)); ec->curr = NULL; /* Disable GPE for command processing (IBF=0/OBF=1) */ @@ -818,8 +824,6 @@ static int acpi_ec_transaction(struct acpi_ec *ec, struct transaction *t) if (!ec || (!t) || (t->wlen && !t->wdata) || (t->rlen && !t->rdata)) return -EINVAL; - if (t->rdata) - memset(t->rdata, 0, t->rlen); mutex_lock(&ec->mutex); if (ec->global_lock) { @@ -846,7 +850,7 @@ static int acpi_ec_burst_enable(struct acpi_ec *ec) .wdata = NULL, .rdata = &d, .wlen = 0, .rlen = 1}; - return acpi_ec_transaction(ec, &t); + return acpi_ec_transaction_unlocked(ec, &t); } static int acpi_ec_burst_disable(struct acpi_ec *ec) @@ -856,7 +860,7 @@ static int acpi_ec_burst_disable(struct acpi_ec *ec) .wlen = 0, .rlen = 0}; return (acpi_ec_read_status(ec) & ACPI_EC_FLAG_BURST) ? - acpi_ec_transaction(ec, &t) : 0; + acpi_ec_transaction_unlocked(ec, &t) : 0; } static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 *data) @@ -872,6 +876,19 @@ static int acpi_ec_read(struct acpi_ec *ec, u8 address, u8 *data) return result; } +static int acpi_ec_read_unlocked(struct acpi_ec *ec, u8 address, u8 *data) +{ + int result; + u8 d; + struct transaction t = {.command = ACPI_EC_COMMAND_READ, + .wdata = &address, .rdata = &d, + .wlen = 1, .rlen = 1}; + + result = acpi_ec_transaction_unlocked(ec, &t); + *data = d; + return result; +} + static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data) { u8 wdata[2] = { address, data }; @@ -882,6 +899,16 @@ static int acpi_ec_write(struct acpi_ec *ec, u8 address, u8 data) return acpi_ec_transaction(ec, &t); } +static int acpi_ec_write_unlocked(struct acpi_ec *ec, u8 address, u8 data) +{ + u8 wdata[2] = { address, data }; + struct transaction t = {.command = ACPI_EC_COMMAND_WRITE, + .wdata = wdata, .rdata = NULL, + .wlen = 2, .rlen = 0}; + + return acpi_ec_transaction_unlocked(ec, &t); +} + int ec_read(u8 addr, u8 *val) { int err; @@ -902,14 +929,10 @@ EXPORT_SYMBOL(ec_read); int ec_write(u8 addr, u8 val) { - int err; - if (!first_ec) return -ENODEV; - err = acpi_ec_write(first_ec, addr, val); - - return err; + return acpi_ec_write(first_ec, addr, val); } EXPORT_SYMBOL(ec_write); @@ -1034,50 +1057,24 @@ void acpi_ec_unblock_transactions(void) acpi_ec_start(first_ec, true); } -void acpi_ec_mark_gpe_for_wake(void) -{ - if (first_ec && !ec_no_wakeup) - acpi_mark_gpe_for_wake(NULL, first_ec->gpe); -} - -void acpi_ec_set_gpe_wake_mask(u8 action) -{ - if (first_ec && !ec_no_wakeup) - acpi_set_gpe_wake_mask(NULL, first_ec->gpe, action); -} - -void acpi_ec_dispatch_gpe(void) -{ - if (first_ec) - acpi_dispatch_gpe(NULL, first_ec->gpe); -} - /* -------------------------------------------------------------------------- Event Management -------------------------------------------------------------------------- */ static struct acpi_ec_query_handler * -acpi_ec_get_query_handler(struct acpi_ec_query_handler *handler) -{ - if (handler) - kref_get(&handler->kref); - return handler; -} - -static struct acpi_ec_query_handler * acpi_ec_get_query_handler_by_value(struct acpi_ec *ec, u8 value) { struct acpi_ec_query_handler *handler; - bool found = false; mutex_lock(&ec->mutex); list_for_each_entry(handler, &ec->list, node) { if (value == handler->query_bit) { - found = true; - break; + kref_get(&handler->kref); + mutex_unlock(&ec->mutex); + return handler; } } mutex_unlock(&ec->mutex); - return found ? acpi_ec_get_query_handler(handler) : NULL; + return NULL; } static void acpi_ec_query_handler_release(struct kref *kref) @@ -1097,9 +1094,12 @@ int acpi_ec_add_query_handler(struct acpi_ec *ec, u8 query_bit, acpi_handle handle, acpi_ec_query_func func, void *data) { - struct acpi_ec_query_handler *handler = - kzalloc(sizeof(struct acpi_ec_query_handler), GFP_KERNEL); + struct acpi_ec_query_handler *handler; + if (!handle && !func) + return -EINVAL; + + handler = kzalloc(sizeof(*handler), GFP_KERNEL); if (!handler) return -ENOMEM; @@ -1111,6 +1111,7 @@ int acpi_ec_add_query_handler(struct acpi_ec *ec, u8 query_bit, kref_init(&handler->kref); list_add(&handler->node, &ec->list); mutex_unlock(&ec->mutex); + return 0; } EXPORT_SYMBOL_GPL(acpi_ec_add_query_handler); @@ -1123,9 +1124,16 @@ static void acpi_ec_remove_query_handlers(struct acpi_ec *ec, mutex_lock(&ec->mutex); list_for_each_entry_safe(handler, tmp, &ec->list, node) { - if (remove_all || query_bit == handler->query_bit) { + /* + * When remove_all is false, only remove custom query handlers + * which have handler->func set. This is done to preserve query + * handlers discovered thru ACPI, as they should continue handling + * EC queries. + */ + if (remove_all || (handler->func && handler->query_bit == query_bit)) { list_del_init(&handler->node); list_add(&handler->node, &free_list); + } } mutex_unlock(&ec->mutex); @@ -1136,10 +1144,34 @@ static void acpi_ec_remove_query_handlers(struct acpi_ec *ec, void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit) { acpi_ec_remove_query_handlers(ec, false, query_bit); + flush_workqueue(ec_query_wq); } EXPORT_SYMBOL_GPL(acpi_ec_remove_query_handler); -static struct acpi_ec_query *acpi_ec_create_query(u8 *pval) +static void acpi_ec_event_processor(struct work_struct *work) +{ + struct acpi_ec_query *q = container_of(work, struct acpi_ec_query, work); + struct acpi_ec_query_handler *handler = q->handler; + struct acpi_ec *ec = q->ec; + + ec_dbg_evt("Query(0x%02x) started", handler->query_bit); + + if (handler->func) + handler->func(handler->data); + else if (handler->handle) + acpi_evaluate_object(handler->handle, NULL, NULL, NULL); + + ec_dbg_evt("Query(0x%02x) stopped", handler->query_bit); + + spin_lock_irq(&ec->lock); + ec->queries_in_progress--; + spin_unlock_irq(&ec->lock); + + acpi_ec_put_query_handler(handler); + kfree(q); +} + +static struct acpi_ec_query *acpi_ec_create_query(struct acpi_ec *ec, u8 *pval) { struct acpi_ec_query *q; struct transaction *t; @@ -1147,44 +1179,23 @@ static struct acpi_ec_query *acpi_ec_create_query(u8 *pval) q = kzalloc(sizeof (struct acpi_ec_query), GFP_KERNEL); if (!q) return NULL; + INIT_WORK(&q->work, acpi_ec_event_processor); t = &q->transaction; t->command = ACPI_EC_COMMAND_QUERY; t->rdata = pval; t->rlen = 1; + q->ec = ec; return q; } -static void acpi_ec_delete_query(struct acpi_ec_query *q) -{ - if (q) { - if (q->handler) - acpi_ec_put_query_handler(q->handler); - kfree(q); - } -} - -static void acpi_ec_event_processor(struct work_struct *work) -{ - struct acpi_ec_query *q = container_of(work, struct acpi_ec_query, work); - struct acpi_ec_query_handler *handler = q->handler; - - ec_dbg_evt("Query(0x%02x) started", handler->query_bit); - if (handler->func) - handler->func(handler->data); - else if (handler->handle) - acpi_evaluate_object(handler->handle, NULL, NULL, NULL); - ec_dbg_evt("Query(0x%02x) stopped", handler->query_bit); - acpi_ec_delete_query(q); -} - -static int acpi_ec_query(struct acpi_ec *ec, u8 *data) +static int acpi_ec_submit_query(struct acpi_ec *ec) { + struct acpi_ec_query *q; u8 value = 0; int result; - struct acpi_ec_query *q; - q = acpi_ec_create_query(&value); + q = acpi_ec_create_query(ec, &value); if (!q) return -ENOMEM; @@ -1194,11 +1205,14 @@ static int acpi_ec_query(struct acpi_ec *ec, u8 *data) * bit to be cleared (and thus clearing the interrupt source). */ result = acpi_ec_transaction(ec, &q->transaction); - if (!value) - result = -ENODATA; if (result) goto err_exit; + if (!value) { + result = -ENODATA; + goto err_exit; + } + q->handler = acpi_ec_get_query_handler_by_value(ec, value); if (!q->handler) { result = -ENODATA; @@ -1206,90 +1220,123 @@ static int acpi_ec_query(struct acpi_ec *ec, u8 *data) } /* - * It is reported that _Qxx are evaluated in a parallel way on - * Windows: + * It is reported that _Qxx are evaluated in a parallel way on Windows: * https://bugzilla.kernel.org/show_bug.cgi?id=94411 * - * Put this log entry before schedule_work() in order to make - * it appearing before any other log entries occurred during the - * work queue execution. + * Put this log entry before queue_work() to make it appear in the log + * before any other messages emitted during workqueue handling. */ ec_dbg_evt("Query(0x%02x) scheduled", value); - if (!queue_work(ec_query_wq, &q->work)) { - ec_dbg_evt("Query(0x%02x) overlapped", value); - result = -EBUSY; - } -err_exit: - if (result) - acpi_ec_delete_query(q); - if (data) - *data = value; - return result; -} + spin_lock_irq(&ec->lock); -static void acpi_ec_check_event(struct acpi_ec *ec) -{ - unsigned long flags; + ec->queries_in_progress++; + queue_work(ec_query_wq, &q->work); - if (ec_event_clearing == ACPI_EC_EVT_TIMING_EVENT) { - if (ec_guard(ec)) { - spin_lock_irqsave(&ec->lock, flags); - /* - * Take care of the SCI_EVT unless no one else is - * taking care of it. - */ - if (!ec->curr) - advance_transaction(ec); - spin_unlock_irqrestore(&ec->lock, flags); - } - } + spin_unlock_irq(&ec->lock); + + return 0; + +err_exit: + kfree(q); + + return result; } static void acpi_ec_event_handler(struct work_struct *work) { - unsigned long flags; struct acpi_ec *ec = container_of(work, struct acpi_ec, work); ec_dbg_evt("Event started"); - spin_lock_irqsave(&ec->lock, flags); - while (ec->nr_pending_queries) { - spin_unlock_irqrestore(&ec->lock, flags); - (void)acpi_ec_query(ec, NULL); - spin_lock_irqsave(&ec->lock, flags); - ec->nr_pending_queries--; - /* - * Before exit, make sure that this work item can be - * scheduled again. There might be QR_EC failures, leaving - * EC_FLAGS_QUERY_PENDING uncleared and preventing this work - * item from being scheduled again. - */ - if (!ec->nr_pending_queries) { - if (ec_event_clearing == ACPI_EC_EVT_TIMING_STATUS || - ec_event_clearing == ACPI_EC_EVT_TIMING_QUERY) - acpi_ec_complete_query(ec); - } + spin_lock_irq(&ec->lock); + + while (ec->events_to_process) { + spin_unlock_irq(&ec->lock); + + acpi_ec_submit_query(ec); + + spin_lock_irq(&ec->lock); + + ec->events_to_process--; } - spin_unlock_irqrestore(&ec->lock, flags); - ec_dbg_evt("Event stopped"); + /* + * Before exit, make sure that the it will be possible to queue up the + * event handling work again regardless of whether or not the query + * queued up above is processed successfully. + */ + if (ec_event_clearing == ACPI_EC_EVT_TIMING_EVENT) { + bool guard_timeout; + + acpi_ec_complete_event(ec); + + ec_dbg_evt("Event stopped"); - acpi_ec_check_event(ec); + spin_unlock_irq(&ec->lock); + + guard_timeout = !!ec_guard(ec); + + spin_lock_irq(&ec->lock); + + /* Take care of SCI_EVT unless someone else is doing that. */ + if (guard_timeout && !ec->curr) + advance_transaction(ec, false); + } else { + acpi_ec_close_event(ec); + + ec_dbg_evt("Event stopped"); + } + + ec->events_in_progress--; + + spin_unlock_irq(&ec->lock); } -static u32 acpi_ec_gpe_handler(acpi_handle gpe_device, - u32 gpe_number, void *data) +static void clear_gpe_and_advance_transaction(struct acpi_ec *ec, bool interrupt) +{ + /* + * Clear GPE_STS upfront to allow subsequent hardware GPE_STS 0->1 + * changes to always trigger a GPE interrupt. + * + * GPE STS is a W1C register, which means: + * + * 1. Software can clear it without worrying about clearing the other + * GPEs' STS bits when the hardware sets them in parallel. + * + * 2. As long as software can ensure only clearing it when it is set, + * hardware won't set it in parallel. + */ + if (ec->gpe >= 0 && acpi_ec_gpe_status_set(ec)) + acpi_clear_gpe(NULL, ec->gpe); + + advance_transaction(ec, true); +} + +static void acpi_ec_handle_interrupt(struct acpi_ec *ec) { unsigned long flags; - struct acpi_ec *ec = data; spin_lock_irqsave(&ec->lock, flags); - advance_transaction(ec); + + clear_gpe_and_advance_transaction(ec, true); + spin_unlock_irqrestore(&ec->lock, flags); +} + +static u32 acpi_ec_gpe_handler(acpi_handle gpe_device, + u32 gpe_number, void *data) +{ + acpi_ec_handle_interrupt(data); return ACPI_INTERRUPT_HANDLED; } +static irqreturn_t acpi_ec_irq_handler(int irq, void *data) +{ + acpi_ec_handle_interrupt(data); + return IRQ_HANDLED; +} + /* -------------------------------------------------------------------------- * Address Space Management * -------------------------------------------------------------------------- */ @@ -1302,6 +1349,7 @@ acpi_ec_space_handler(u32 function, acpi_physical_address address, struct acpi_ec *ec = handler_context; int result = 0, i, bytes = bits / 8; u8 *value = (u8 *)value64; + u32 glk; if ((address > 0xFF) || !value || !handler_context) return AE_BAD_PARAMETER; @@ -1309,17 +1357,38 @@ acpi_ec_space_handler(u32 function, acpi_physical_address address, if (function != ACPI_READ && function != ACPI_WRITE) return AE_BAD_PARAMETER; + mutex_lock(&ec->mutex); + + if (ec->global_lock) { + acpi_status status; + + status = acpi_acquire_global_lock(ACPI_EC_UDELAY_GLK, &glk); + if (ACPI_FAILURE(status)) { + result = -ENODEV; + goto unlock; + } + } + if (ec->busy_polling || bits > 8) acpi_ec_burst_enable(ec); - for (i = 0; i < bytes; ++i, ++address, ++value) + for (i = 0; i < bytes; ++i, ++address, ++value) { result = (function == ACPI_READ) ? - acpi_ec_read(ec, address, value) : - acpi_ec_write(ec, address, *value); + acpi_ec_read_unlocked(ec, address, value) : + acpi_ec_write_unlocked(ec, address, *value); + if (result < 0) + break; + } if (ec->busy_polling || bits > 8) acpi_ec_burst_disable(ec); + if (ec->global_lock) + acpi_release_global_lock(glk); + +unlock: + mutex_unlock(&ec->mutex); + switch (result) { case -EINVAL: return AE_BAD_PARAMETER; @@ -1327,8 +1396,10 @@ acpi_ec_space_handler(u32 function, acpi_physical_address address, return AE_NOT_FOUND; case -ETIME: return AE_TIME; - default: + case 0: return AE_OK; + default: + return AE_ERROR; } } @@ -1362,6 +1433,8 @@ static struct acpi_ec *acpi_ec_alloc(void) ec->timestamp = jiffies; ec->busy_polling = true; ec->polling_guard = 0; + ec->gpe = -1; + ec->irq = -1; return ec; } @@ -1399,20 +1472,16 @@ ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval) if (ec->data_addr == 0 || ec->command_addr == 0) return AE_OK; - if (boot_ec && boot_ec_is_ecdt && EC_FLAGS_IGNORE_DSDT_GPE) { - /* - * Always inherit the GPE number setting from the ECDT - * EC. - */ - ec->gpe = boot_ec->gpe; - } else { - /* Get GPE bit assignment (EC events). */ - /* TODO: Add support for _GPE returning a package */ - status = acpi_evaluate_integer(handle, "_GPE", NULL, &tmp); - if (ACPI_FAILURE(status)) - return status; + /* Get GPE bit assignment (EC events). */ + /* TODO: Add support for _GPE returning a package */ + status = acpi_evaluate_integer(handle, "_GPE", NULL, &tmp); + if (ACPI_SUCCESS(status)) ec->gpe = tmp; - } + /* + * Errors are non-fatal, allowing for ACPI Reduced Hardware + * platforms which use GpioInt instead of GPE. + */ + /* Use the global lock for all EC transactions? */ tmp = 0; acpi_evaluate_integer(handle, "_GLK", NULL, &tmp); @@ -1421,63 +1490,111 @@ ec_parse_device(acpi_handle handle, u32 Level, void *context, void **retval) return AE_CTRL_TERMINATE; } -/* - * Note: This function returns an error code only when the address space - * handler is not installed, which means "not able to handle - * transactions". +static bool install_gpe_event_handler(struct acpi_ec *ec) +{ + acpi_status status; + + status = acpi_install_gpe_raw_handler(NULL, ec->gpe, + ACPI_GPE_EDGE_TRIGGERED, + &acpi_ec_gpe_handler, ec); + if (ACPI_FAILURE(status)) + return false; + + if (test_bit(EC_FLAGS_STARTED, &ec->flags) && ec->reference_count >= 1) + acpi_ec_enable_gpe(ec, true); + + return true; +} + +static bool install_gpio_irq_event_handler(struct acpi_ec *ec) +{ + return request_threaded_irq(ec->irq, NULL, acpi_ec_irq_handler, + IRQF_SHARED | IRQF_ONESHOT, "ACPI EC", ec) >= 0; +} + +/** + * ec_install_handlers - Install service callbacks and register query methods. + * @ec: Target EC. + * @device: ACPI device object corresponding to @ec. + * @call_reg: If _REG should be called to notify OpRegion availability + * + * Install a handler for the EC address space type unless it has been installed + * already. If @device is not NULL, also look for EC query methods in the + * namespace and register them, and install an event (either GPE or GPIO IRQ) + * handler for the EC, if possible. + * + * Return: + * -ENODEV if the address space handler cannot be installed, which means + * "unable to handle transactions", + * -EPROBE_DEFER if GPIO IRQ acquisition needs to be deferred, + * or 0 (success) otherwise. */ -static int ec_install_handlers(struct acpi_ec *ec, bool handle_events) +static int ec_install_handlers(struct acpi_ec *ec, struct acpi_device *device, + bool call_reg) { acpi_status status; acpi_ec_start(ec, false); if (!test_bit(EC_FLAGS_EC_HANDLER_INSTALLED, &ec->flags)) { + acpi_handle scope_handle = ec == first_ec ? ACPI_ROOT_OBJECT : ec->handle; + acpi_ec_enter_noirq(ec); - status = acpi_install_address_space_handler(ec->handle, - ACPI_ADR_SPACE_EC, - &acpi_ec_space_handler, - NULL, ec); + status = acpi_install_address_space_handler_no_reg(scope_handle, + ACPI_ADR_SPACE_EC, + &acpi_ec_space_handler, + NULL, ec); if (ACPI_FAILURE(status)) { - if (status == AE_NOT_FOUND) { - /* - * Maybe OS fails in evaluating the _REG - * object. The AE_NOT_FOUND error will be - * ignored and OS * continue to initialize - * EC. - */ - pr_err("Fail in evaluating the _REG object" - " of EC device. Broken bios is suspected.\n"); - } else { - acpi_ec_stop(ec, false); - return -ENODEV; - } + acpi_ec_stop(ec, false); + return -ENODEV; } set_bit(EC_FLAGS_EC_HANDLER_INSTALLED, &ec->flags); } - if (!handle_events) + if (call_reg && !test_bit(EC_FLAGS_EC_REG_CALLED, &ec->flags)) { + acpi_execute_reg_methods(ec->handle, ACPI_UINT32_MAX, ACPI_ADR_SPACE_EC); + set_bit(EC_FLAGS_EC_REG_CALLED, &ec->flags); + } + + if (!device) return 0; - if (!test_bit(EC_FLAGS_EVT_HANDLER_INSTALLED, &ec->flags)) { + if (ec->gpe < 0) { + /* ACPI reduced hardware platforms use a GpioInt from _CRS. */ + int irq = acpi_dev_gpio_irq_get(device, 0); + /* + * Bail out right away for deferred probing or complete the + * initialization regardless of any other errors. + */ + if (irq == -EPROBE_DEFER) + return -EPROBE_DEFER; + else if (irq >= 0) + ec->irq = irq; + } + + if (!test_bit(EC_FLAGS_QUERY_METHODS_INSTALLED, &ec->flags)) { /* Find and register all query methods */ acpi_walk_namespace(ACPI_TYPE_METHOD, ec->handle, 1, acpi_ec_register_query_methods, NULL, ec, NULL); - set_bit(EC_FLAGS_EVT_HANDLER_INSTALLED, &ec->flags); + set_bit(EC_FLAGS_QUERY_METHODS_INSTALLED, &ec->flags); } - if (!test_bit(EC_FLAGS_GPE_HANDLER_INSTALLED, &ec->flags)) { - status = acpi_install_gpe_raw_handler(NULL, ec->gpe, - ACPI_GPE_EDGE_TRIGGERED, - &acpi_ec_gpe_handler, ec); - /* This is not fatal as we can poll EC events */ - if (ACPI_SUCCESS(status)) { - set_bit(EC_FLAGS_GPE_HANDLER_INSTALLED, &ec->flags); + if (!test_bit(EC_FLAGS_EVENT_HANDLER_INSTALLED, &ec->flags)) { + bool ready = false; + + if (ec->gpe >= 0) + ready = install_gpe_event_handler(ec); + else if (ec->irq >= 0) + ready = install_gpio_irq_event_handler(ec); + + if (ready) { + set_bit(EC_FLAGS_EVENT_HANDLER_INSTALLED, &ec->flags); acpi_ec_leave_noirq(ec); - if (test_bit(EC_FLAGS_STARTED, &ec->flags) && - ec->reference_count >= 1) - acpi_ec_enable_gpe(ec, true); } + /* + * Failures to install an event handler are not fatal, because + * the EC can be polled for events. + */ } /* EC is fully operational, allow queries */ acpi_ec_enable_event(ec); @@ -1487,9 +1604,13 @@ static int ec_install_handlers(struct acpi_ec *ec, bool handle_events) static void ec_remove_handlers(struct acpi_ec *ec) { + acpi_handle scope_handle = ec == first_ec ? ACPI_ROOT_OBJECT : ec->handle; + if (test_bit(EC_FLAGS_EC_HANDLER_INSTALLED, &ec->flags)) { - if (ACPI_FAILURE(acpi_remove_address_space_handler(ec->handle, - ACPI_ADR_SPACE_EC, &acpi_ec_space_handler))) + if (ACPI_FAILURE(acpi_remove_address_space_handler( + scope_handle, + ACPI_ADR_SPACE_EC, + &acpi_ec_space_handler))) pr_err("failed to remove space handler\n"); clear_bit(EC_FLAGS_EC_HANDLER_INSTALLED, &ec->flags); } @@ -1507,153 +1628,107 @@ static void ec_remove_handlers(struct acpi_ec *ec) */ acpi_ec_stop(ec, false); - if (test_bit(EC_FLAGS_GPE_HANDLER_INSTALLED, &ec->flags)) { - if (ACPI_FAILURE(acpi_remove_gpe_handler(NULL, ec->gpe, - &acpi_ec_gpe_handler))) + if (test_bit(EC_FLAGS_EVENT_HANDLER_INSTALLED, &ec->flags)) { + if (ec->gpe >= 0 && + ACPI_FAILURE(acpi_remove_gpe_handler(NULL, ec->gpe, + &acpi_ec_gpe_handler))) pr_err("failed to remove gpe handler\n"); - clear_bit(EC_FLAGS_GPE_HANDLER_INSTALLED, &ec->flags); + + if (ec->irq >= 0) + free_irq(ec->irq, ec); + + clear_bit(EC_FLAGS_EVENT_HANDLER_INSTALLED, &ec->flags); } - if (test_bit(EC_FLAGS_EVT_HANDLER_INSTALLED, &ec->flags)) { + if (test_bit(EC_FLAGS_QUERY_METHODS_INSTALLED, &ec->flags)) { acpi_ec_remove_query_handlers(ec, true, 0); - clear_bit(EC_FLAGS_EVT_HANDLER_INSTALLED, &ec->flags); + clear_bit(EC_FLAGS_QUERY_METHODS_INSTALLED, &ec->flags); } } -static int acpi_ec_setup(struct acpi_ec *ec, bool handle_events) +static int acpi_ec_setup(struct acpi_ec *ec, struct acpi_device *device, bool call_reg) { int ret; - ret = ec_install_handlers(ec, handle_events); - if (ret) - return ret; - /* First EC capable of handling transactions */ - if (!first_ec) { + if (!first_ec) first_ec = ec; - acpi_handle_info(first_ec->handle, "Used as first EC\n"); - } - - acpi_handle_info(ec->handle, - "GPE=0x%x, EC_CMD/EC_SC=0x%lx, EC_DATA=0x%lx\n", - ec->gpe, ec->command_addr, ec->data_addr); - return ret; -} -static int acpi_config_boot_ec(struct acpi_ec *ec, acpi_handle handle, - bool handle_events, bool is_ecdt) -{ - int ret; - - /* - * Changing the ACPI handle results in a re-configuration of the - * boot EC. And if it happens after the namespace initialization, - * it causes _REG evaluations. - */ - if (boot_ec && boot_ec->handle != handle) - ec_remove_handlers(boot_ec); + ret = ec_install_handlers(ec, device, call_reg); + if (ret) { + if (ec == first_ec) + first_ec = NULL; - /* Unset old boot EC */ - if (boot_ec != ec) - acpi_ec_free(boot_ec); - - /* - * ECDT device creation is split into acpi_ec_ecdt_probe() and - * acpi_ec_ecdt_start(). This function takes care of completing the - * ECDT parsing logic as the handle update should be performed - * between the installation/uninstallation of the handlers. - */ - if (ec->handle != handle) - ec->handle = handle; - - ret = acpi_ec_setup(ec, handle_events); - if (ret) return ret; - - /* Set new boot EC */ - if (!boot_ec) { - boot_ec = ec; - boot_ec_is_ecdt = is_ecdt; } - acpi_handle_info(boot_ec->handle, - "Used as boot %s EC to handle transactions%s\n", - is_ecdt ? "ECDT" : "DSDT", - handle_events ? " and events" : ""); - return ret; -} - -static bool acpi_ec_ecdt_get_handle(acpi_handle *phandle) -{ - struct acpi_table_ecdt *ecdt_ptr; - acpi_status status; - acpi_handle handle; - - status = acpi_get_table(ACPI_SIG_ECDT, 1, - (struct acpi_table_header **)&ecdt_ptr); - if (ACPI_FAILURE(status)) - return false; + pr_info("EC_CMD/EC_SC=0x%lx, EC_DATA=0x%lx\n", ec->command_addr, + ec->data_addr); - status = acpi_get_handle(NULL, ecdt_ptr->id, &handle); - if (ACPI_FAILURE(status)) - return false; - - *phandle = handle; - return true; -} + if (test_bit(EC_FLAGS_EVENT_HANDLER_INSTALLED, &ec->flags)) { + if (ec->gpe >= 0) + pr_info("GPE=0x%x\n", ec->gpe); + else + pr_info("IRQ=%d\n", ec->irq); + } -static bool acpi_is_boot_ec(struct acpi_ec *ec) -{ - if (!boot_ec) - return false; - if (ec->command_addr == boot_ec->command_addr && - ec->data_addr == boot_ec->data_addr) - return true; - return false; + return ret; } static int acpi_ec_add(struct acpi_device *device) { - struct acpi_ec *ec = NULL; + struct acpi_ec *ec; int ret; - bool is_ecdt = false; - acpi_status status; - strcpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME); - strcpy(acpi_device_class(device), ACPI_EC_CLASS); + strscpy(acpi_device_name(device), ACPI_EC_DEVICE_NAME); + strscpy(acpi_device_class(device), ACPI_EC_CLASS); - if (!strcmp(acpi_device_hid(device), ACPI_ECDT_HID)) { - is_ecdt = true; + if (boot_ec && (boot_ec->handle == device->handle || + !strcmp(acpi_device_hid(device), ACPI_ECDT_HID))) { + /* Fast path: this device corresponds to the boot EC. */ ec = boot_ec; } else { + acpi_status status; + ec = acpi_ec_alloc(); if (!ec) return -ENOMEM; + status = ec_parse_device(device->handle, 0, ec, NULL); if (status != AE_CTRL_TERMINATE) { ret = -EINVAL; - goto err_alloc; + goto err; } - } - if (acpi_is_boot_ec(ec)) { - boot_ec_is_ecdt = is_ecdt; - if (!is_ecdt) { + if (boot_ec && ec->command_addr == boot_ec->command_addr && + ec->data_addr == boot_ec->data_addr) { /* - * Trust PNP0C09 namespace location rather than - * ECDT ID. But trust ECDT GPE rather than _GPE - * because of ASUS quirks, so do not change - * boot_ec->gpe to ec->gpe. + * Trust PNP0C09 namespace location rather than ECDT ID. + * But trust ECDT GPE rather than _GPE because of ASUS + * quirks. So do not change boot_ec->gpe to ec->gpe, + * except when the TRUST_DSDT_GPE quirk is set. */ boot_ec->handle = ec->handle; + + if (EC_FLAGS_TRUST_DSDT_GPE) + boot_ec->gpe = ec->gpe; + acpi_handle_debug(ec->handle, "duplicated.\n"); acpi_ec_free(ec); ec = boot_ec; } - ret = acpi_config_boot_ec(ec, ec->handle, true, is_ecdt); - } else - ret = acpi_ec_setup(ec, true); + } + + ret = acpi_ec_setup(ec, device, true); if (ret) - goto err_query; + goto err; + + if (ec == boot_ec) + acpi_handle_info(boot_ec->handle, + "Boot %s EC initialization complete\n", + boot_ec_is_ecdt ? "ECDT" : "DSDT"); + + acpi_handle_info(ec->handle, + "EC: Used to handle transactions and events\n"); device->driver_data = ec; @@ -1662,28 +1737,25 @@ static int acpi_ec_add(struct acpi_device *device) ret = !!request_region(ec->command_addr, 1, "EC cmd"); WARN(!ret, "Could not request EC cmd io port 0x%lx", ec->command_addr); - if (!is_ecdt) { - /* Reprobe devices depending on the EC */ - acpi_walk_dep_device_list(ec->handle); - } + /* Reprobe devices depending on the EC */ + acpi_dev_clear_dependencies(device); + acpi_handle_debug(ec->handle, "enumerated.\n"); return 0; -err_query: - if (ec != boot_ec) - acpi_ec_remove_query_handlers(ec, true, 0); -err_alloc: +err: if (ec != boot_ec) acpi_ec_free(ec); + return ret; } -static int acpi_ec_remove(struct acpi_device *device) +static void acpi_ec_remove(struct acpi_device *device) { struct acpi_ec *ec; if (!device) - return -EINVAL; + return; ec = acpi_driver_data(device); release_region(ec->data_addr, 1); @@ -1693,7 +1765,12 @@ static int acpi_ec_remove(struct acpi_device *device) ec_remove_handlers(ec); acpi_ec_free(ec); } - return 0; +} + +void acpi_ec_register_opregions(struct acpi_device *adev) +{ + if (first_ec && first_ec->handle != adev->handle) + acpi_execute_reg_methods(adev->handle, 1, ACPI_ADR_SPACE_EC); } static acpi_status @@ -1730,10 +1807,10 @@ static const struct acpi_device_id ec_device_ids[] = { * namespace EC before the main ACPI device enumeration process. It is * retained for historical reason and will be deprecated in the future. */ -int __init acpi_ec_dsdt_probe(void) +void __init acpi_ec_dsdt_probe(void) { - acpi_status status; struct acpi_ec *ec; + acpi_status status; int ret; /* @@ -1743,21 +1820,22 @@ int __init acpi_ec_dsdt_probe(void) * picking up an invalid EC device. */ if (boot_ec) - return -ENODEV; + return; ec = acpi_ec_alloc(); if (!ec) - return -ENOMEM; + return; + /* * At this point, the namespace is initialized, so start to find * the namespace objects. */ - status = acpi_get_devices(ec_device_ids[0].id, - ec_parse_device, ec, NULL); + status = acpi_get_devices(ec_device_ids[0].id, ec_parse_device, ec, NULL); if (ACPI_FAILURE(status) || !ec->handle) { - ret = -ENODEV; - goto error; + acpi_ec_free(ec); + return; } + /* * When the DSDT EC is available, always re-configure boot EC to * have _REG evaluated. _REG can only be evaluated after the @@ -1765,60 +1843,82 @@ int __init acpi_ec_dsdt_probe(void) * At this point, the GPE is not fully initialized, so do not to * handle the events. */ - ret = acpi_config_boot_ec(ec, ec->handle, false, false); -error: - if (ret) + ret = acpi_ec_setup(ec, NULL, true); + if (ret) { acpi_ec_free(ec); - return ret; + return; + } + + boot_ec = ec; + + acpi_handle_info(ec->handle, + "Boot DSDT EC used to handle transactions\n"); } /* - * If the DSDT EC is not functioning, we still need to prepare a fully - * functioning ECDT EC first in order to handle the events. - * https://bugzilla.kernel.org/show_bug.cgi?id=115021 + * acpi_ec_ecdt_start - Finalize the boot ECDT EC initialization. + * + * First, look for an ACPI handle for the boot ECDT EC if acpi_ec_add() has not + * found a matching object in the namespace. + * + * Next, in case the DSDT EC is not functioning, it is still necessary to + * provide a functional ECDT EC to handle events, so add an extra device object + * to represent it (see https://bugzilla.kernel.org/show_bug.cgi?id=115021). + * + * This is useful on platforms with valid ECDT and invalid DSDT EC settings, + * like ASUS X550ZE (see https://bugzilla.kernel.org/show_bug.cgi?id=196847). */ -static int __init acpi_ec_ecdt_start(void) +static void __init acpi_ec_ecdt_start(void) { + struct acpi_table_ecdt *ecdt_ptr; acpi_handle handle; + acpi_status status; - if (!boot_ec) - return -ENODEV; - /* In case acpi_ec_ecdt_start() is called after acpi_ec_add() */ - if (!boot_ec_is_ecdt) - return -ENODEV; + /* Bail out if a matching EC has been found in the namespace. */ + if (!boot_ec || boot_ec->handle != ACPI_ROOT_OBJECT) + return; - /* - * At this point, the namespace and the GPE is initialized, so - * start to find the namespace objects and handle the events. - * - * Note: ec->handle can be valid if this function is called after - * acpi_ec_add(), hence the fast path. - */ - if (boot_ec->handle == ACPI_ROOT_OBJECT) { - if (!acpi_ec_ecdt_get_handle(&handle)) - return -ENODEV; + /* Look up the object pointed to from the ECDT in the namespace. */ + status = acpi_get_table(ACPI_SIG_ECDT, 1, + (struct acpi_table_header **)&ecdt_ptr); + if (ACPI_FAILURE(status)) + return; + + status = acpi_get_handle(NULL, ecdt_ptr->id, &handle); + if (ACPI_SUCCESS(status)) { boot_ec->handle = handle; + + /* Add a special ACPI device object to represent the boot EC. */ + acpi_bus_register_early_device(ACPI_BUS_TYPE_ECDT_EC); } - /* Register to ACPI bus with PM ops attached */ - return acpi_bus_register_early_device(ACPI_BUS_TYPE_ECDT_EC); + acpi_put_table((struct acpi_table_header *)ecdt_ptr); } -#if 0 /* - * Some EC firmware variations refuses to respond QR_EC when SCI_EVT is not - * set, for which case, we complete the QR_EC without issuing it to the - * firmware. - * https://bugzilla.kernel.org/show_bug.cgi?id=82611 - * https://bugzilla.kernel.org/show_bug.cgi?id=97381 + * On some hardware it is necessary to clear events accumulated by the EC during + * sleep. These ECs stop reporting GPEs until they are manually polled, if too + * many events are accumulated. (e.g. Samsung Series 5/9 notebooks) + * + * https://bugzilla.kernel.org/show_bug.cgi?id=44161 + * + * Ideally, the EC should also be instructed NOT to accumulate events during + * sleep (which Windows seems to do somehow), but the interface to control this + * behaviour is not known at this time. + * + * Models known to be affected are Samsung 530Uxx/535Uxx/540Uxx/550Pxx/900Xxx, + * however it is very likely that other Samsung models are affected. + * + * On systems which don't accumulate _Q events during sleep, this extra check + * should be harmless. */ -static int ec_flag_query_handshake(const struct dmi_system_id *id) +static int ec_clear_on_resume(const struct dmi_system_id *id) { - pr_debug("Detected the EC firmware requiring QR_EC issued when SCI_EVT set\n"); - EC_FLAGS_QUERY_HANDSHAKE = 1; + pr_debug("Detected system needing EC poll on resume.\n"); + EC_FLAGS_CLEAR_ON_RESUME = 1; + ec_event_clearing = ACPI_EC_EVT_TIMING_STATUS; return 0; } -#endif /* * Some ECDTs contain wrong register addresses. @@ -1833,75 +1933,129 @@ static int ec_correct_ecdt(const struct dmi_system_id *id) } /* - * Some DSDTs contain wrong GPE setting. - * Asus FX502VD/VE, GL702VMK, X550VXK, X580VD - * https://bugzilla.kernel.org/show_bug.cgi?id=195651 + * Some ECDTs contain wrong GPE setting, but they share the same port addresses + * with DSDT EC, don't duplicate the DSDT EC with ECDT EC in this case. + * https://bugzilla.kernel.org/show_bug.cgi?id=209989 */ -static int ec_honor_ecdt_gpe(const struct dmi_system_id *id) +static int ec_honor_dsdt_gpe(const struct dmi_system_id *id) { - pr_debug("Detected system needing ignore DSDT GPE setting.\n"); - EC_FLAGS_IGNORE_DSDT_GPE = 1; + pr_debug("Detected system needing DSDT GPE setting.\n"); + EC_FLAGS_TRUST_DSDT_GPE = 1; return 0; } static const struct dmi_system_id ec_dmi_table[] __initconst = { { - ec_correct_ecdt, "MSI MS-171F", { - DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star"), - DMI_MATCH(DMI_PRODUCT_NAME, "MS-171F"),}, NULL}, + /* + * MSI MS-171F + * https://bugzilla.kernel.org/show_bug.cgi?id=12461 + */ + .callback = ec_correct_ecdt, + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "Micro-Star"), + DMI_MATCH(DMI_PRODUCT_NAME, "MS-171F"), + }, + }, { - ec_honor_ecdt_gpe, "ASUS FX502VD", { - DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."), - DMI_MATCH(DMI_PRODUCT_NAME, "FX502VD"),}, NULL}, + /* + * HP Pavilion Gaming Laptop 15-cx0xxx + * https://bugzilla.kernel.org/show_bug.cgi?id=209989 + */ + .callback = ec_honor_dsdt_gpe, + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "HP"), + DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion Gaming Laptop 15-cx0xxx"), + }, + }, { - ec_honor_ecdt_gpe, "ASUS FX502VE", { - DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."), - DMI_MATCH(DMI_PRODUCT_NAME, "FX502VE"),}, NULL}, + /* + * HP Pavilion Gaming Laptop 15-cx0041ur + */ + .callback = ec_honor_dsdt_gpe, + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "HP"), + DMI_MATCH(DMI_PRODUCT_NAME, "HP 15-cx0041ur"), + }, + }, { - ec_honor_ecdt_gpe, "ASUS GL702VMK", { - DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."), - DMI_MATCH(DMI_PRODUCT_NAME, "GL702VMK"),}, NULL}, + /* + * HP Pavilion Gaming Laptop 15-dk1xxx + * https://github.com/systemd/systemd/issues/28942 + */ + .callback = ec_honor_dsdt_gpe, + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "HP"), + DMI_MATCH(DMI_PRODUCT_NAME, "HP Pavilion Gaming Laptop 15-dk1xxx"), + }, + }, { - ec_honor_ecdt_gpe, "ASUS X550VXK", { - DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."), - DMI_MATCH(DMI_PRODUCT_NAME, "X550VXK"),}, NULL}, + /* + * HP 250 G7 Notebook PC + */ + .callback = ec_honor_dsdt_gpe, + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "HP"), + DMI_MATCH(DMI_PRODUCT_NAME, "HP 250 G7 Notebook PC"), + }, + }, { - ec_honor_ecdt_gpe, "ASUS X580VD", { - DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."), - DMI_MATCH(DMI_PRODUCT_NAME, "X580VD"),}, NULL}, - {}, + /* + * Samsung hardware + * https://bugzilla.kernel.org/show_bug.cgi?id=44161 + */ + .callback = ec_clear_on_resume, + .matches = { + DMI_MATCH(DMI_SYS_VENDOR, "SAMSUNG ELECTRONICS CO., LTD."), + }, + }, + {} }; -int __init acpi_ec_ecdt_probe(void) +void __init acpi_ec_ecdt_probe(void) { - int ret; - acpi_status status; struct acpi_table_ecdt *ecdt_ptr; struct acpi_ec *ec; + acpi_status status; + int ret; - ec = acpi_ec_alloc(); - if (!ec) - return -ENOMEM; - /* - * Generate a boot ec context - */ + /* Generate a boot ec context. */ dmi_check_system(ec_dmi_table); status = acpi_get_table(ACPI_SIG_ECDT, 1, (struct acpi_table_header **)&ecdt_ptr); - if (ACPI_FAILURE(status)) { - ret = -ENODEV; - goto error; - } + if (ACPI_FAILURE(status)) + return; if (!ecdt_ptr->control.address || !ecdt_ptr->data.address) { /* * Asus X50GL: * https://bugzilla.kernel.org/show_bug.cgi?id=11880 */ - ret = -ENODEV; - goto error; + goto out; + } + + if (!strlen(ecdt_ptr->id)) { + /* + * The ECDT table on some MSI notebooks contains invalid data, together + * with an empty ID string (""). + * + * Section 5.2.15 of the ACPI specification requires the ID string to be + * a "fully qualified reference to the (...) embedded controller device", + * so this string always has to start with a backslash. + * + * However some ThinkBook machines have a ECDT table with a valid EC + * description but an invalid ID string ("_SB.PC00.LPCB.EC0"). + * + * Because of this we only check if the ID string is empty in order to + * avoid the obvious cases. + */ + pr_err(FW_BUG "Ignoring ECDT due to empty ID string\n"); + goto out; } + ec = acpi_ec_alloc(); + if (!ec) + goto out; + if (EC_FLAGS_CORRECT_ECDT) { ec->command_addr = ecdt_ptr->data.address; ec->data_addr = ecdt_ptr->control.address; @@ -1909,17 +2063,33 @@ int __init acpi_ec_ecdt_probe(void) ec->command_addr = ecdt_ptr->control.address; ec->data_addr = ecdt_ptr->data.address; } - ec->gpe = ecdt_ptr->gpe; + + /* + * Ignore the GPE value on Reduced Hardware platforms. + * Some products have this set to an erroneous value. + */ + if (!acpi_gbl_reduced_hardware) + ec->gpe = ecdt_ptr->gpe; + + ec->handle = ACPI_ROOT_OBJECT; /* * At this point, the namespace is not initialized, so do not find * the namespace objects, or handle the events. */ - ret = acpi_config_boot_ec(ec, ACPI_ROOT_OBJECT, false, true); -error: - if (ret) + ret = acpi_ec_setup(ec, NULL, false); + if (ret) { acpi_ec_free(ec); - return ret; + goto out; + } + + boot_ec = ec; + boot_ec_is_ecdt = true; + + pr_info("Boot ECDT EC used to handle transactions\n"); + +out: + acpi_put_table((struct acpi_table_header *)ecdt_ptr); } #ifdef CONFIG_PM_SLEEP @@ -1928,7 +2098,7 @@ static int acpi_ec_suspend(struct device *dev) struct acpi_ec *ec = acpi_driver_data(to_acpi_device(dev)); - if (acpi_sleep_no_ec_events() && ec_freeze_events) + if (!pm_suspend_no_platform() && ec_freeze_events) acpi_ec_disable_event(ec); return 0; } @@ -1942,11 +2112,10 @@ static int acpi_ec_suspend_noirq(struct device *dev) * masked at the low level without side effects. */ if (ec_no_wakeup && test_bit(EC_FLAGS_STARTED, &ec->flags) && - ec->reference_count >= 1) + ec->gpe >= 0 && ec->reference_count >= 1) acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_DISABLE); - if (acpi_sleep_no_ec_events()) - acpi_ec_enter_noirq(ec); + acpi_ec_enter_noirq(ec); return 0; } @@ -1955,11 +2124,10 @@ static int acpi_ec_resume_noirq(struct device *dev) { struct acpi_ec *ec = acpi_driver_data(to_acpi_device(dev)); - if (acpi_sleep_no_ec_events()) - acpi_ec_leave_noirq(ec); + acpi_ec_leave_noirq(ec); if (ec_no_wakeup && test_bit(EC_FLAGS_STARTED, &ec->flags) && - ec->reference_count >= 1) + ec->gpe >= 0 && ec->reference_count >= 1) acpi_set_gpe(NULL, ec->gpe, ACPI_GPE_ENABLE); return 0; @@ -1973,7 +2141,85 @@ static int acpi_ec_resume(struct device *dev) acpi_ec_enable_event(ec); return 0; } -#endif + +void acpi_ec_mark_gpe_for_wake(void) +{ + if (first_ec && !ec_no_wakeup) + acpi_mark_gpe_for_wake(NULL, first_ec->gpe); +} +EXPORT_SYMBOL_GPL(acpi_ec_mark_gpe_for_wake); + +void acpi_ec_set_gpe_wake_mask(u8 action) +{ + if (pm_suspend_no_platform() && first_ec && !ec_no_wakeup) + acpi_set_gpe_wake_mask(NULL, first_ec->gpe, action); +} + +static bool acpi_ec_work_in_progress(struct acpi_ec *ec) +{ + return ec->events_in_progress + ec->queries_in_progress > 0; +} + +bool acpi_ec_dispatch_gpe(void) +{ + bool work_in_progress = false; + + if (!first_ec) + return acpi_any_gpe_status_set(U32_MAX); + + /* + * Report wakeup if the status bit is set for any enabled GPE other + * than the EC one. + */ + if (acpi_any_gpe_status_set(first_ec->gpe)) + return true; + + /* + * Cancel the SCI wakeup and process all pending events in case there + * are any wakeup ones in there. + * + * Note that if any non-EC GPEs are active at this point, the SCI will + * retrigger after the rearming in acpi_s2idle_wake(), so no events + * should be missed by canceling the wakeup here. + */ + pm_system_cancel_wakeup(); + + /* + * Dispatch the EC GPE in-band, but do not report wakeup in any case + * to allow the caller to process events properly after that. + */ + spin_lock_irq(&first_ec->lock); + + if (acpi_ec_gpe_status_set(first_ec)) { + pm_pr_dbg("ACPI EC GPE status set\n"); + + clear_gpe_and_advance_transaction(first_ec, false); + work_in_progress = acpi_ec_work_in_progress(first_ec); + } + + spin_unlock_irq(&first_ec->lock); + + if (!work_in_progress) + return false; + + pm_pr_dbg("ACPI EC GPE dispatched\n"); + + /* Drain EC work. */ + do { + acpi_ec_flush_work(); + + pm_pr_dbg("ACPI EC work flushed\n"); + + spin_lock_irq(&first_ec->lock); + + work_in_progress = acpi_ec_work_in_progress(first_ec); + + spin_unlock_irq(&first_ec->lock); + } while (work_in_progress && !pm_wakeup_pending()); + + return false; +} +#endif /* CONFIG_PM_SLEEP */ static const struct dev_pm_ops acpi_ec_pm = { SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(acpi_ec_suspend_noirq, acpi_ec_resume_noirq) @@ -2004,13 +2250,13 @@ static int param_get_event_clearing(char *buffer, { switch (ec_event_clearing) { case ACPI_EC_EVT_TIMING_STATUS: - return sprintf(buffer, "status"); + return sprintf(buffer, "status\n"); case ACPI_EC_EVT_TIMING_QUERY: - return sprintf(buffer, "query"); + return sprintf(buffer, "query\n"); case ACPI_EC_EVT_TIMING_EVENT: - return sprintf(buffer, "event"); + return sprintf(buffer, "event\n"); default: - return sprintf(buffer, "invalid"); + return sprintf(buffer, "invalid\n"); } return 0; } @@ -2030,59 +2276,97 @@ static struct acpi_driver acpi_ec_driver = { .drv.pm = &acpi_ec_pm, }; -static inline int acpi_ec_query_init(void) +static void acpi_ec_destroy_workqueues(void) { - if (!ec_query_wq) { - ec_query_wq = alloc_workqueue("kec_query", 0, - ec_max_queries); - if (!ec_query_wq) - return -ENODEV; + if (ec_wq) { + destroy_workqueue(ec_wq); + ec_wq = NULL; } - return 0; -} - -static inline void acpi_ec_query_exit(void) -{ if (ec_query_wq) { destroy_workqueue(ec_query_wq); ec_query_wq = NULL; } } +static int acpi_ec_init_workqueues(void) +{ + if (!ec_wq) + ec_wq = alloc_ordered_workqueue("kec", 0); + + if (!ec_query_wq) + ec_query_wq = alloc_workqueue("kec_query", WQ_PERCPU, + ec_max_queries); + + if (!ec_wq || !ec_query_wq) { + acpi_ec_destroy_workqueues(); + return -ENODEV; + } + return 0; +} + static const struct dmi_system_id acpi_ec_no_wakeup[] = { { - .ident = "Thinkpad X1 Carbon 6th", .matches = { DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), DMI_MATCH(DMI_PRODUCT_FAMILY, "Thinkpad X1 Carbon 6th"), }, }, { - .ident = "ThinkPad X1 Carbon 6th", .matches = { DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), - DMI_MATCH(DMI_PRODUCT_FAMILY, "ThinkPad X1 Carbon 6th"), + DMI_MATCH(DMI_PRODUCT_FAMILY, "ThinkPad X1 Yoga 3rd"), }, }, { - .ident = "ThinkPad X1 Yoga 3rd", .matches = { - DMI_MATCH(DMI_SYS_VENDOR, "LENOVO"), - DMI_MATCH(DMI_PRODUCT_FAMILY, "ThinkPad X1 Yoga 3rd"), + DMI_MATCH(DMI_SYS_VENDOR, "HP"), + DMI_MATCH(DMI_PRODUCT_FAMILY, "103C_5336AN HP ZHAN 66 Pro"), + }, + }, + /* + * Lenovo Legion Go S; touchscreen blocks HW sleep when woken up from EC + * https://gitlab.freedesktop.org/drm/amd/-/issues/3929 + */ + { + .matches = { + DMI_MATCH(DMI_BOARD_VENDOR, "LENOVO"), + DMI_MATCH(DMI_PRODUCT_NAME, "83L3"), + } + }, + { + .matches = { + DMI_MATCH(DMI_BOARD_VENDOR, "LENOVO"), + DMI_MATCH(DMI_PRODUCT_NAME, "83N6"), + } + }, + { + .matches = { + DMI_MATCH(DMI_BOARD_VENDOR, "LENOVO"), + DMI_MATCH(DMI_PRODUCT_NAME, "83Q2"), + } + }, + { + .matches = { + DMI_MATCH(DMI_BOARD_VENDOR, "LENOVO"), + DMI_MATCH(DMI_PRODUCT_NAME, "83Q3"), + } + }, + { + // TUXEDO InfinityBook Pro AMD Gen9 + .matches = { + DMI_MATCH(DMI_BOARD_NAME, "GXxHRXx"), }, }, { }, }; -int __init acpi_ec_init(void) +void __init acpi_ec_init(void) { int result; - int ecdt_fail, dsdt_fail; - /* register workqueue for _Qxx evaluations */ - result = acpi_ec_query_init(); + result = acpi_ec_init_workqueues(); if (result) - return result; + return; /* * Disable EC wakeup on following systems to prevent periodic @@ -2093,16 +2377,10 @@ int __init acpi_ec_init(void) pr_debug("Disabling EC wakeup on suspend-to-idle\n"); } - /* Drivers must be started after acpi_ec_query_init() */ - dsdt_fail = acpi_bus_register_driver(&acpi_ec_driver); - /* - * Register ECDT to ACPI bus only when PNP0C09 probe fails. This is - * useful for platforms (confirmed on ASUS X550ZE) with valid ECDT - * settings but invalid DSDT settings. - * https://bugzilla.kernel.org/show_bug.cgi?id=196847 - */ - ecdt_fail = acpi_ec_ecdt_start(); - return ecdt_fail && dsdt_fail ? -ENODEV : 0; + /* Driver must be registered after acpi_ec_init_workqueues(). */ + acpi_bus_register_driver(&acpi_ec_driver); + + acpi_ec_ecdt_start(); } /* EC driver currently not unloadable */ @@ -2111,6 +2389,6 @@ static void __exit acpi_ec_exit(void) { acpi_bus_unregister_driver(&acpi_ec_driver); - acpi_ec_query_exit(); + acpi_ec_destroy_workqueues(); } #endif /* 0 */ |