From 5c1e88b98c60e4074796e9a05d3c674479ab1919 Mon Sep 17 00:00:00 2001 From: Maximilian Luz Date: Fri, 27 May 2022 04:34:38 +0200 Subject: platform/surface: aggregator: Allow notifiers to avoid communication on unregistering When SSAM client devices have been (physically) hot-removed, communication attempts with those devices may fail and time out. This can even extend to event notifiers, due to which timeouts may occur during device removal, slowing down that process. Add a parameter to the notifier unregister function that allows skipping communication with the EC to prevent this. Furthermore, add wrappers for registering and unregistering notifiers belonging to SSAM client devices that automatically check if the device has been marked as hot-removed and communication should be avoided. Note that non-SSAM client devices can generally not be hot-removed, so also add a convenience wrapper for those, defaulting to allow communication. Signed-off-by: Maximilian Luz Link: https://lore.kernel.org/r/20220527023447.2460025-4-luzmaximilian@gmail.com Reviewed-by: Hans de Goede Signed-off-by: Hans de Goede --- drivers/platform/surface/aggregator/controller.c | 53 ++++++++++++++++-------- 1 file changed, 35 insertions(+), 18 deletions(-) (limited to 'drivers/platform/surface/aggregator/controller.c') diff --git a/drivers/platform/surface/aggregator/controller.c b/drivers/platform/surface/aggregator/controller.c index b8c377b3f932..6de834b52b63 100644 --- a/drivers/platform/surface/aggregator/controller.c +++ b/drivers/platform/surface/aggregator/controller.c @@ -2199,16 +2199,26 @@ static int ssam_nf_refcount_enable(struct ssam_controller *ctrl, } /** - * ssam_nf_refcount_disable_free() - Disable event for reference count entry if it is - * no longer in use and free the corresponding entry. + * ssam_nf_refcount_disable_free() - Disable event for reference count entry if + * it is no longer in use and free the corresponding entry. * @ctrl: The controller to disable the event on. * @entry: The reference count entry for the event to be disabled. * @flags: The flags used for enabling the event on the EC. + * @ec: Flag specifying if the event should actually be disabled on the EC. * - * If the reference count equals zero, i.e. the event is no longer requested by - * any client, the event will be disabled and the corresponding reference count - * entry freed. The reference count entry must not be used any more after a - * call to this function. + * If ``ec`` equals ``true`` and the reference count equals zero (i.e. the + * event is no longer requested by any client), the specified event will be + * disabled on the EC via the corresponding request. + * + * If ``ec`` equals ``false``, no request will be sent to the EC and the event + * can be considered in a detached state (i.e. no longer used but still + * enabled). Disabling an event via this method may be required for + * hot-removable devices, where event disable requests may time out after the + * device has been physically removed. + * + * In both cases, if the reference count equals zero, the corresponding + * reference count entry will be freed. The reference count entry must not be + * used any more after a call to this function. * * Also checks if the flags used for disabling the event match the flags used * for enabling the event and warns if they do not (regardless of reference @@ -2223,7 +2233,7 @@ static int ssam_nf_refcount_enable(struct ssam_controller *ctrl, * returns the status of the event-enable EC command. */ static int ssam_nf_refcount_disable_free(struct ssam_controller *ctrl, - struct ssam_nf_refcount_entry *entry, u8 flags) + struct ssam_nf_refcount_entry *entry, u8 flags, bool ec) { const struct ssam_event_registry reg = entry->key.reg; const struct ssam_event_id id = entry->key.id; @@ -2232,8 +2242,9 @@ static int ssam_nf_refcount_disable_free(struct ssam_controller *ctrl, lockdep_assert_held(&nf->lock); - ssam_dbg(ctrl, "disabling event (reg: %#04x, tc: %#04x, iid: %#04x, rc: %d)\n", - reg.target_category, id.target_category, id.instance, entry->refcount); + ssam_dbg(ctrl, "%s event (reg: %#04x, tc: %#04x, iid: %#04x, rc: %d)\n", + ec ? "disabling" : "detaching", reg.target_category, id.target_category, + id.instance, entry->refcount); if (entry->flags != flags) { ssam_warn(ctrl, @@ -2242,7 +2253,7 @@ static int ssam_nf_refcount_disable_free(struct ssam_controller *ctrl, id.instance); } - if (entry->refcount == 0) { + if (ec && entry->refcount == 0) { status = ssam_ssh_event_disable(ctrl, reg, id, flags); kfree(entry); } @@ -2322,20 +2333,26 @@ int ssam_notifier_register(struct ssam_controller *ctrl, struct ssam_event_notif EXPORT_SYMBOL_GPL(ssam_notifier_register); /** - * ssam_notifier_unregister() - Unregister an event notifier. - * @ctrl: The controller the notifier has been registered on. - * @n: The event notifier to unregister. + * __ssam_notifier_unregister() - Unregister an event notifier. + * @ctrl: The controller the notifier has been registered on. + * @n: The event notifier to unregister. + * @disable: Whether to disable the corresponding event on the EC. * * Unregister an event notifier. Decrement the usage counter of the associated * SAM event if the notifier is not marked as an observer. If the usage counter - * reaches zero, the event will be disabled. + * reaches zero and ``disable`` equals ``true``, the event will be disabled. + * + * Useful for hot-removable devices, where communication may fail once the + * device has been physically removed. In that case, specifying ``disable`` as + * ``false`` avoids communication with the EC. * * Return: Returns zero on success, %-ENOENT if the given notifier block has * not been registered on the controller. If the given notifier block was the * last one associated with its specific event, returns the status of the * event-disable EC-command. */ -int ssam_notifier_unregister(struct ssam_controller *ctrl, struct ssam_event_notifier *n) +int __ssam_notifier_unregister(struct ssam_controller *ctrl, struct ssam_event_notifier *n, + bool disable) { u16 rqid = ssh_tc_to_rqid(n->event.id.target_category); struct ssam_nf_refcount_entry *entry; @@ -2373,7 +2390,7 @@ int ssam_notifier_unregister(struct ssam_controller *ctrl, struct ssam_event_not goto remove; } - status = ssam_nf_refcount_disable_free(ctrl, entry, n->event.flags); + status = ssam_nf_refcount_disable_free(ctrl, entry, n->event.flags, disable); } remove: @@ -2383,7 +2400,7 @@ remove: return status; } -EXPORT_SYMBOL_GPL(ssam_notifier_unregister); +EXPORT_SYMBOL_GPL(__ssam_notifier_unregister); /** * ssam_controller_event_enable() - Enable the specified event. @@ -2477,7 +2494,7 @@ int ssam_controller_event_disable(struct ssam_controller *ctrl, return -ENOENT; } - status = ssam_nf_refcount_disable_free(ctrl, entry, flags); + status = ssam_nf_refcount_disable_free(ctrl, entry, flags, true); mutex_unlock(&nf->lock); return status; -- cgit From 221756e61b7cc3d7f47f57fb4f371242aa4ccb1d Mon Sep 17 00:00:00 2001 From: Maximilian Luz Date: Fri, 24 Jun 2022 22:58:00 +0200 Subject: platform/surface: Update copyright year of various drivers Update the copyright of various Surface drivers to the current year. Signed-off-by: Maximilian Luz Link: https://lore.kernel.org/r/20220624205800.1355621-4-luzmaximilian@gmail.com Reviewed-by: Hans de Goede Signed-off-by: Hans de Goede --- drivers/platform/surface/aggregator/Kconfig | 2 +- drivers/platform/surface/aggregator/Makefile | 2 +- drivers/platform/surface/aggregator/bus.c | 2 +- drivers/platform/surface/aggregator/bus.h | 2 +- drivers/platform/surface/aggregator/controller.c | 2 +- drivers/platform/surface/aggregator/controller.h | 2 +- drivers/platform/surface/aggregator/core.c | 2 +- drivers/platform/surface/aggregator/ssh_msgb.h | 2 +- drivers/platform/surface/aggregator/ssh_packet_layer.c | 2 +- drivers/platform/surface/aggregator/ssh_packet_layer.h | 2 +- drivers/platform/surface/aggregator/ssh_parser.c | 2 +- drivers/platform/surface/aggregator/ssh_parser.h | 2 +- drivers/platform/surface/aggregator/ssh_request_layer.c | 2 +- drivers/platform/surface/aggregator/ssh_request_layer.h | 2 +- drivers/platform/surface/aggregator/trace.h | 2 +- drivers/platform/surface/surface_acpi_notify.c | 2 +- drivers/platform/surface/surface_aggregator_cdev.c | 2 +- drivers/platform/surface/surface_aggregator_registry.c | 2 +- drivers/platform/surface/surface_dtx.c | 2 +- drivers/platform/surface/surface_gpe.c | 2 +- drivers/platform/surface/surface_hotplug.c | 2 +- drivers/platform/surface/surface_platform_profile.c | 2 +- 22 files changed, 22 insertions(+), 22 deletions(-) (limited to 'drivers/platform/surface/aggregator/controller.c') diff --git a/drivers/platform/surface/aggregator/Kconfig b/drivers/platform/surface/aggregator/Kconfig index cab020324256..c114f9dd5fe1 100644 --- a/drivers/platform/surface/aggregator/Kconfig +++ b/drivers/platform/surface/aggregator/Kconfig @@ -1,5 +1,5 @@ # SPDX-License-Identifier: GPL-2.0+ -# Copyright (C) 2019-2021 Maximilian Luz +# Copyright (C) 2019-2022 Maximilian Luz menuconfig SURFACE_AGGREGATOR tristate "Microsoft Surface System Aggregator Module Subsystem and Drivers" diff --git a/drivers/platform/surface/aggregator/Makefile b/drivers/platform/surface/aggregator/Makefile index c0d550eda5cd..fdf664a217f9 100644 --- a/drivers/platform/surface/aggregator/Makefile +++ b/drivers/platform/surface/aggregator/Makefile @@ -1,5 +1,5 @@ # SPDX-License-Identifier: GPL-2.0+ -# Copyright (C) 2019-2021 Maximilian Luz +# Copyright (C) 2019-2022 Maximilian Luz # For include/trace/define_trace.h to include trace.h CFLAGS_core.o = -I$(src) diff --git a/drivers/platform/surface/aggregator/bus.c b/drivers/platform/surface/aggregator/bus.c index e0b0381a2834..de539938896e 100644 --- a/drivers/platform/surface/aggregator/bus.c +++ b/drivers/platform/surface/aggregator/bus.c @@ -2,7 +2,7 @@ /* * Surface System Aggregator Module bus and device integration. * - * Copyright (C) 2019-2021 Maximilian Luz + * Copyright (C) 2019-2022 Maximilian Luz */ #include diff --git a/drivers/platform/surface/aggregator/bus.h b/drivers/platform/surface/aggregator/bus.h index 6964ee84e79c..5b4dbf21906c 100644 --- a/drivers/platform/surface/aggregator/bus.h +++ b/drivers/platform/surface/aggregator/bus.h @@ -2,7 +2,7 @@ /* * Surface System Aggregator Module bus and device integration. * - * Copyright (C) 2019-2021 Maximilian Luz + * Copyright (C) 2019-2022 Maximilian Luz */ #ifndef _SURFACE_AGGREGATOR_BUS_H diff --git a/drivers/platform/surface/aggregator/controller.c b/drivers/platform/surface/aggregator/controller.c index 6de834b52b63..43e765199137 100644 --- a/drivers/platform/surface/aggregator/controller.c +++ b/drivers/platform/surface/aggregator/controller.c @@ -2,7 +2,7 @@ /* * Main SSAM/SSH controller structure and functionality. * - * Copyright (C) 2019-2021 Maximilian Luz + * Copyright (C) 2019-2022 Maximilian Luz */ #include diff --git a/drivers/platform/surface/aggregator/controller.h b/drivers/platform/surface/aggregator/controller.h index a0963c3562ff..f0d987abc51e 100644 --- a/drivers/platform/surface/aggregator/controller.h +++ b/drivers/platform/surface/aggregator/controller.h @@ -2,7 +2,7 @@ /* * Main SSAM/SSH controller structure and functionality. * - * Copyright (C) 2019-2021 Maximilian Luz + * Copyright (C) 2019-2022 Maximilian Luz */ #ifndef _SURFACE_AGGREGATOR_CONTROLLER_H diff --git a/drivers/platform/surface/aggregator/core.c b/drivers/platform/surface/aggregator/core.c index a62c5dfe42d6..1a6373dea109 100644 --- a/drivers/platform/surface/aggregator/core.c +++ b/drivers/platform/surface/aggregator/core.c @@ -7,7 +7,7 @@ * Handles communication via requests as well as enabling, disabling, and * relaying of events. * - * Copyright (C) 2019-2021 Maximilian Luz + * Copyright (C) 2019-2022 Maximilian Luz */ #include diff --git a/drivers/platform/surface/aggregator/ssh_msgb.h b/drivers/platform/surface/aggregator/ssh_msgb.h index e562958ffdf0..f3ecad92eefd 100644 --- a/drivers/platform/surface/aggregator/ssh_msgb.h +++ b/drivers/platform/surface/aggregator/ssh_msgb.h @@ -2,7 +2,7 @@ /* * SSH message builder functions. * - * Copyright (C) 2019-2021 Maximilian Luz + * Copyright (C) 2019-2022 Maximilian Luz */ #ifndef _SURFACE_AGGREGATOR_SSH_MSGB_H diff --git a/drivers/platform/surface/aggregator/ssh_packet_layer.c b/drivers/platform/surface/aggregator/ssh_packet_layer.c index 8a4451c1ffe5..6748fe4ac5d5 100644 --- a/drivers/platform/surface/aggregator/ssh_packet_layer.c +++ b/drivers/platform/surface/aggregator/ssh_packet_layer.c @@ -2,7 +2,7 @@ /* * SSH packet transport layer. * - * Copyright (C) 2019-2021 Maximilian Luz + * Copyright (C) 2019-2022 Maximilian Luz */ #include diff --git a/drivers/platform/surface/aggregator/ssh_packet_layer.h b/drivers/platform/surface/aggregator/ssh_packet_layer.h index 2eb329f0b91a..64633522f971 100644 --- a/drivers/platform/surface/aggregator/ssh_packet_layer.h +++ b/drivers/platform/surface/aggregator/ssh_packet_layer.h @@ -2,7 +2,7 @@ /* * SSH packet transport layer. * - * Copyright (C) 2019-2021 Maximilian Luz + * Copyright (C) 2019-2022 Maximilian Luz */ #ifndef _SURFACE_AGGREGATOR_SSH_PACKET_LAYER_H diff --git a/drivers/platform/surface/aggregator/ssh_parser.c b/drivers/platform/surface/aggregator/ssh_parser.c index b77912f8f13b..a6f668694365 100644 --- a/drivers/platform/surface/aggregator/ssh_parser.c +++ b/drivers/platform/surface/aggregator/ssh_parser.c @@ -2,7 +2,7 @@ /* * SSH message parser. * - * Copyright (C) 2019-2021 Maximilian Luz + * Copyright (C) 2019-2022 Maximilian Luz */ #include diff --git a/drivers/platform/surface/aggregator/ssh_parser.h b/drivers/platform/surface/aggregator/ssh_parser.h index 3bd6e180fd16..801d8fa69fb5 100644 --- a/drivers/platform/surface/aggregator/ssh_parser.h +++ b/drivers/platform/surface/aggregator/ssh_parser.h @@ -2,7 +2,7 @@ /* * SSH message parser. * - * Copyright (C) 2019-2021 Maximilian Luz + * Copyright (C) 2019-2022 Maximilian Luz */ #ifndef _SURFACE_AGGREGATOR_SSH_PARSER_H diff --git a/drivers/platform/surface/aggregator/ssh_request_layer.c b/drivers/platform/surface/aggregator/ssh_request_layer.c index 790f7f0eee98..f5565570f16c 100644 --- a/drivers/platform/surface/aggregator/ssh_request_layer.c +++ b/drivers/platform/surface/aggregator/ssh_request_layer.c @@ -2,7 +2,7 @@ /* * SSH request transport layer. * - * Copyright (C) 2019-2021 Maximilian Luz + * Copyright (C) 2019-2022 Maximilian Luz */ #include diff --git a/drivers/platform/surface/aggregator/ssh_request_layer.h b/drivers/platform/surface/aggregator/ssh_request_layer.h index 9c3cbae2d4bd..4e387a031351 100644 --- a/drivers/platform/surface/aggregator/ssh_request_layer.h +++ b/drivers/platform/surface/aggregator/ssh_request_layer.h @@ -2,7 +2,7 @@ /* * SSH request transport layer. * - * Copyright (C) 2019-2021 Maximilian Luz + * Copyright (C) 2019-2022 Maximilian Luz */ #ifndef _SURFACE_AGGREGATOR_SSH_REQUEST_LAYER_H diff --git a/drivers/platform/surface/aggregator/trace.h b/drivers/platform/surface/aggregator/trace.h index cc9e73fbc18e..2a2c17771d01 100644 --- a/drivers/platform/surface/aggregator/trace.h +++ b/drivers/platform/surface/aggregator/trace.h @@ -2,7 +2,7 @@ /* * Trace points for SSAM/SSH. * - * Copyright (C) 2020-2021 Maximilian Luz + * Copyright (C) 2020-2022 Maximilian Luz */ #undef TRACE_SYSTEM diff --git a/drivers/platform/surface/surface_acpi_notify.c b/drivers/platform/surface/surface_acpi_notify.c index c0e12f0b9b79..44e317970557 100644 --- a/drivers/platform/surface/surface_acpi_notify.c +++ b/drivers/platform/surface/surface_acpi_notify.c @@ -8,7 +8,7 @@ * notifications sent from ACPI via the SAN interface by providing them to any * registered external driver. * - * Copyright (C) 2019-2020 Maximilian Luz + * Copyright (C) 2019-2022 Maximilian Luz */ #include diff --git a/drivers/platform/surface/surface_aggregator_cdev.c b/drivers/platform/surface/surface_aggregator_cdev.c index 30fb50fde450..492c82e69182 100644 --- a/drivers/platform/surface/surface_aggregator_cdev.c +++ b/drivers/platform/surface/surface_aggregator_cdev.c @@ -3,7 +3,7 @@ * Provides user-space access to the SSAM EC via the /dev/surface/aggregator * misc device. Intended for debugging and development. * - * Copyright (C) 2020-2021 Maximilian Luz + * Copyright (C) 2020-2022 Maximilian Luz */ #include diff --git a/drivers/platform/surface/surface_aggregator_registry.c b/drivers/platform/surface/surface_aggregator_registry.c index 0cbb7f3a6b2d..d5655f6a4a41 100644 --- a/drivers/platform/surface/surface_aggregator_registry.c +++ b/drivers/platform/surface/surface_aggregator_registry.c @@ -6,7 +6,7 @@ * cannot be auto-detected. Provides device-hubs and performs instantiation * for these devices. * - * Copyright (C) 2020-2021 Maximilian Luz + * Copyright (C) 2020-2022 Maximilian Luz */ #include diff --git a/drivers/platform/surface/surface_dtx.c b/drivers/platform/surface/surface_dtx.c index 1203b9a82993..ed36944467f9 100644 --- a/drivers/platform/surface/surface_dtx.c +++ b/drivers/platform/surface/surface_dtx.c @@ -8,7 +8,7 @@ * acknowledge (to speed things up), abort (e.g. in case the dGPU is still in * use), or request detachment via user-space. * - * Copyright (C) 2019-2021 Maximilian Luz + * Copyright (C) 2019-2022 Maximilian Luz */ #include diff --git a/drivers/platform/surface/surface_gpe.c b/drivers/platform/surface/surface_gpe.c index ec66fde28e75..27365cbe1ee9 100644 --- a/drivers/platform/surface/surface_gpe.c +++ b/drivers/platform/surface/surface_gpe.c @@ -4,7 +4,7 @@ * properly configuring the respective GPEs. Required for wakeup via lid on * newer Intel-based Microsoft Surface devices. * - * Copyright (C) 2020 Maximilian Luz + * Copyright (C) 2020-2022 Maximilian Luz */ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt diff --git a/drivers/platform/surface/surface_hotplug.c b/drivers/platform/surface/surface_hotplug.c index cfcc15cfbacb..f004a2495201 100644 --- a/drivers/platform/surface/surface_hotplug.c +++ b/drivers/platform/surface/surface_hotplug.c @@ -10,7 +10,7 @@ * Event signaling is handled via ACPI, which will generate the appropriate * device-check notifications to be picked up by the PCIe hot-plug driver. * - * Copyright (C) 2019-2021 Maximilian Luz + * Copyright (C) 2019-2022 Maximilian Luz */ #include diff --git a/drivers/platform/surface/surface_platform_profile.c b/drivers/platform/surface/surface_platform_profile.c index 6373d3b5eb7f..fbf2e11fd6ce 100644 --- a/drivers/platform/surface/surface_platform_profile.c +++ b/drivers/platform/surface/surface_platform_profile.c @@ -3,7 +3,7 @@ * Surface Platform Profile / Performance Mode driver for Surface System * Aggregator Module (thermal subsystem). * - * Copyright (C) 2021 Maximilian Luz + * Copyright (C) 2021-2022 Maximilian Luz */ #include -- cgit