From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754621AbaBCXin (ORCPT ); Mon, 3 Feb 2014 18:38:43 -0500 Received: from v094114.home.net.pl ([79.96.170.134]:53378 "HELO v094114.home.net.pl" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with SMTP id S1752427AbaBCX2U (ORCPT ); Mon, 3 Feb 2014 18:28:20 -0500 From: "Rafael J. Wysocki" To: ACPI Devel Maling List Cc: Mika Westerberg , Bjorn Helgaas , Aaron Lu , Linux Kernel Mailing List , Linux PCI Subject: [PATCH 23/24][Update] ACPI / hotplug / PCI: Hotplug notifications from acpi_bus_notify() Date: Tue, 04 Feb 2014 00:40:26 +0100 Message-ID: <4319453.nrCmpQmkNH@vostro.rjw.lan> User-Agent: KMail/4.11.4 (Linux/3.13.0+; KDE/4.11.4; x86_64; ; ) In-Reply-To: <7532948.aJNUotNMpR@vostro.rjw.lan> References: <2217793.001RY6hKlo@vostro.rjw.lan> <20140203104408.GQ18029@intel.com> <7532948.aJNUotNMpR@vostro.rjw.lan> MIME-Version: 1.0 Content-Transfer-Encoding: 7Bit Content-Type: text/plain; charset="utf-8" Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Rafael J. Wysocki Since acpi_bus_notify() is executed on all notifications for all devices anyway, make it execute acpi_device_hotplug() for all hotplug events instead of installing notify handlers pointing to the same function for all hotplug devices. This change reduces both the size and complexity of ACPI-based device hotplug code. Moreover, since acpi_device_hotplug() only does significant things for devices that have either an ACPI scan handler, or a hotplug context with .eject() defined, and those devices had notify handlers pointing to acpi_hotplug_notify_cb() installed before anyway, this modification shouldn't change functionality. Signed-off-by: Rafael J. Wysocki --- drivers/acpi/bus.c | 61 +++++++++++++--------- drivers/acpi/internal.h | 1 drivers/acpi/scan.c | 101 ------------------------------------- drivers/pci/hotplug/acpiphp.h | 1 drivers/pci/hotplug/acpiphp_glue.c | 24 ++++---- include/acpi/acpi_bus.h | 2 6 files changed, 53 insertions(+), 137 deletions(-) Index: linux-pm/drivers/acpi/bus.c =================================================================== --- linux-pm.orig/drivers/acpi/bus.c +++ linux-pm/drivers/acpi/bus.c @@ -340,62 +340,77 @@ static void acpi_bus_osc_support(void) */ static void acpi_bus_notify(acpi_handle handle, u32 type, void *data) { - struct acpi_device *device; + struct acpi_device *adev; struct acpi_driver *driver; - - ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Notification %#02x to handle %p\n", - type, handle)); + acpi_status status; + u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; switch (type) { - case ACPI_NOTIFY_BUS_CHECK: - /* TBD */ + acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n"); break; case ACPI_NOTIFY_DEVICE_CHECK: - /* TBD */ + acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n"); break; case ACPI_NOTIFY_DEVICE_WAKE: - /* TBD */ + acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_WAKE event\n"); break; case ACPI_NOTIFY_EJECT_REQUEST: - /* TBD */ + acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n"); break; case ACPI_NOTIFY_DEVICE_CHECK_LIGHT: + acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK_LIGHT event\n"); /* TBD: Exactly what does 'light' mean? */ break; case ACPI_NOTIFY_FREQUENCY_MISMATCH: - /* TBD */ + acpi_handle_err(handle, "Device cannot be configured due " + "to a frequency mismatch\n"); break; case ACPI_NOTIFY_BUS_MODE_MISMATCH: - /* TBD */ + acpi_handle_err(handle, "Device cannot be configured due " + "to a bus mode mismatch\n"); break; case ACPI_NOTIFY_POWER_FAULT: - /* TBD */ + acpi_handle_err(handle, "Device has suffered a power fault\n"); break; default: - ACPI_DEBUG_PRINT((ACPI_DB_INFO, - "Received unknown/unsupported notification [%08x]\n", - type)); - break; + acpi_handle_warn(handle, "Unsupported event type 0x%x\n", type); + ost_code = ACPI_OST_SC_UNRECOGNIZED_NOTIFY; + goto err; } - device = acpi_bus_get_acpi_device(handle); - if (device) { - driver = device->driver; - if (driver && driver->ops.notify && - (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS)) - driver->ops.notify(device, type); + adev = acpi_bus_get_acpi_device(handle); + if (!adev) + goto err; + + driver = adev->driver; + if (driver && driver->ops.notify && + (driver->flags & ACPI_DRIVER_ALL_NOTIFY_EVENTS)) + driver->ops.notify(adev, type); - acpi_bus_put_acpi_device(device); + switch (type) { + case ACPI_NOTIFY_BUS_CHECK: + case ACPI_NOTIFY_DEVICE_CHECK: + case ACPI_NOTIFY_EJECT_REQUEST: + status = acpi_hotplug_execute(acpi_device_hotplug, adev, type); + if (ACPI_SUCCESS(status)) + return; + default: + break; } + acpi_bus_put_acpi_device(adev); + return; + + err: + acpi_evaluate_hotplug_ost(handle, type, ost_code, NULL); } /* -------------------------------------------------------------------------- Index: linux-pm/drivers/acpi/internal.h =================================================================== --- linux-pm.orig/drivers/acpi/internal.h +++ linux-pm/drivers/acpi/internal.h @@ -73,6 +73,7 @@ static inline void acpi_lpss_init(void) #endif bool acpi_queue_hotplug_work(struct work_struct *work); +void acpi_device_hotplug(void *data, u32 src); bool acpi_scan_is_offline(struct acpi_device *adev, bool uevent); /* -------------------------------------------------------------------------- Index: linux-pm/drivers/acpi/scan.c =================================================================== --- linux-pm.orig/drivers/acpi/scan.c +++ linux-pm/drivers/acpi/scan.c @@ -470,7 +470,7 @@ static int acpi_generic_hotplug_event(st return -EINVAL; } -static void acpi_device_hotplug(void *data, u32 src) +void acpi_device_hotplug(void *data, u32 src) { u32 ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; struct acpi_device *adev = data; @@ -520,75 +520,6 @@ static void acpi_device_hotplug(void *da unlock_device_hotplug(); } -static void acpi_hotplug_notify_cb(acpi_handle handle, u32 type, void *data) -{ - u32 ost_code = ACPI_OST_SC_SUCCESS; - struct acpi_device *adev; - acpi_status status; - - switch (type) { - case ACPI_NOTIFY_BUS_CHECK: - acpi_handle_debug(handle, "ACPI_NOTIFY_BUS_CHECK event\n"); - break; - - case ACPI_NOTIFY_DEVICE_CHECK: - acpi_handle_debug(handle, "ACPI_NOTIFY_DEVICE_CHECK event\n"); - break; - - case ACPI_NOTIFY_EJECT_REQUEST: - acpi_handle_debug(handle, "ACPI_NOTIFY_EJECT_REQUEST event\n"); - break; - - case ACPI_NOTIFY_DEVICE_WAKE: - return; - - case ACPI_NOTIFY_FREQUENCY_MISMATCH: - acpi_handle_err(handle, "Device cannot be configured due " - "to a frequency mismatch\n"); - goto out; - - case ACPI_NOTIFY_BUS_MODE_MISMATCH: - acpi_handle_err(handle, "Device cannot be configured due " - "to a bus mode mismatch\n"); - goto out; - - case ACPI_NOTIFY_POWER_FAULT: - acpi_handle_err(handle, "Device has suffered a power fault\n"); - goto out; - - default: - acpi_handle_warn(handle, "Unsupported event type 0x%x\n", type); - ost_code = ACPI_OST_SC_UNRECOGNIZED_NOTIFY; - goto out; - } - - ost_code = ACPI_OST_SC_NON_SPECIFIC_FAILURE; - adev = acpi_bus_get_acpi_device(handle); - if (!adev) - goto out; - - status = acpi_hotplug_execute(acpi_device_hotplug, adev, type); - if (ACPI_SUCCESS(status)) - return; - - acpi_bus_put_acpi_device(adev); - - out: - acpi_evaluate_hotplug_ost(handle, type, ost_code, NULL); -} - -void acpi_install_hotplug_notify_handler(acpi_handle handle) -{ - acpi_install_notify_handler(handle, ACPI_SYSTEM_NOTIFY, - acpi_hotplug_notify_cb, NULL); -} - -void acpi_remove_hotplug_notify_handler(acpi_handle handle) -{ - acpi_remove_notify_handler(handle, ACPI_SYSTEM_NOTIFY, - acpi_hotplug_notify_cb); -} - static ssize_t real_power_state_show(struct device *dev, struct device_attribute *attr, char *buf) { @@ -2029,34 +1960,6 @@ void acpi_scan_hotplug_enabled(struct ac mutex_unlock(&acpi_scan_lock); } -static void acpi_scan_init_hotplug(acpi_handle handle, int type) -{ - struct acpi_device_pnp pnp = {}; - struct acpi_hardware_id *hwid; - struct acpi_scan_handler *handler; - - INIT_LIST_HEAD(&pnp.ids); - acpi_set_pnp_ids(handle, &pnp, type); - - if (!pnp.type.hardware_id) - goto out; - - /* - * This relies on the fact that acpi_install_notify_handler() will not - * install the same notify handler routine twice for the same handle. - */ - list_for_each_entry(hwid, &pnp.ids, list) { - handler = acpi_scan_match_handler(hwid->id, NULL); - if (handler) { - acpi_install_hotplug_notify_handler(handle); - break; - } - } - -out: - acpi_free_pnp_ids(&pnp); -} - static acpi_status acpi_bus_check_add(acpi_handle handle, u32 lvl_not_used, void *not_used, void **return_value) { @@ -2078,8 +1981,6 @@ static acpi_status acpi_bus_check_add(ac return AE_OK; } - acpi_scan_init_hotplug(handle, type); - acpi_add_single_object(&device, handle, type, sta); if (!device) return AE_CTRL_DEPTH; Index: linux-pm/drivers/pci/hotplug/acpiphp_glue.c =================================================================== --- linux-pm.orig/drivers/pci/hotplug/acpiphp_glue.c +++ linux-pm/drivers/pci/hotplug/acpiphp_glue.c @@ -293,7 +293,6 @@ static acpi_status register_slot(acpi_ha newfunc = &context->func; newfunc->function = function; newfunc->parent = bridge; - acpi_unlock_hp_context(); if (acpi_has_method(handle, "_EJ0")) newfunc->flags = FUNC_HAS_EJ0; @@ -301,8 +300,14 @@ static acpi_status register_slot(acpi_ha if (acpi_has_method(handle, "_STA")) newfunc->flags |= FUNC_HAS_STA; + /* + * Dock stations' notify handler should be used for dock devices instead + * of the common one, so clear hp.event in their contexts. + */ if (acpi_has_method(handle, "_DCK")) - newfunc->flags |= FUNC_HAS_DCK; + context->hp.event = NULL; + + acpi_unlock_hp_context(); /* search for objects that share the same slot */ list_for_each_entry(slot, &bridge->slots, node) @@ -370,10 +375,6 @@ static acpi_status register_slot(acpi_ha pr_debug("failed to register dock device\n"); } - /* install notify handler */ - if (!(newfunc->flags & FUNC_HAS_DCK)) - acpi_install_hotplug_notify_handler(handle); - return AE_OK; } @@ -407,13 +408,14 @@ static void cleanup_bridge(struct acpiph list_for_each_entry(slot, &bridge->slots, node) { list_for_each_entry(func, &slot->funcs, sibling) { - acpi_handle handle = func_to_handle(func); + struct acpi_device *adev = func_to_acpi_device(func); - if (is_dock_device(handle)) - unregister_hotplug_dock_device(handle); + if (is_dock_device(adev->handle)) + unregister_hotplug_dock_device(adev->handle); - if (!(func->flags & FUNC_HAS_DCK)) - acpi_remove_hotplug_notify_handler(handle); + acpi_lock_hp_context(); + adev->hp->event = NULL; + acpi_unlock_hp_context(); } slot->flags |= SLOT_IS_GOING_AWAY; if (slot->slot) Index: linux-pm/include/acpi/acpi_bus.h =================================================================== --- linux-pm.orig/include/acpi/acpi_bus.h +++ linux-pm/include/acpi/acpi_bus.h @@ -445,8 +445,6 @@ static inline bool acpi_device_enumerate typedef void (*acpi_hp_callback)(void *data, u32 src); acpi_status acpi_hotplug_execute(acpi_hp_callback func, void *data, u32 src); -void acpi_install_hotplug_notify_handler(acpi_handle handle); -void acpi_remove_hotplug_notify_handler(acpi_handle handle); /** * module_acpi_driver(acpi_driver) - Helper macro for registering an ACPI driver Index: linux-pm/drivers/pci/hotplug/acpiphp.h =================================================================== --- linux-pm.orig/drivers/pci/hotplug/acpiphp.h +++ linux-pm/drivers/pci/hotplug/acpiphp.h @@ -167,7 +167,6 @@ struct acpiphp_attention_info #define FUNC_HAS_STA (0x00000001) #define FUNC_HAS_EJ0 (0x00000002) -#define FUNC_HAS_DCK (0x00000004) /* function prototypes */