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Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1kVBLW-0005Hg-Es; Wed, 21 Oct 2020 10:27:54 +0000 Received: from foss.arm.com ([217.140.110.172]) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1kVBLS-0005Gm-PL for linux-arm-kernel@lists.infradead.org; Wed, 21 Oct 2020 10:27:52 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 3F9DB1FB; Wed, 21 Oct 2020 03:27:45 -0700 (PDT) Received: from e120937-lin (unknown [172.31.20.19]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 9F5813F66E; Wed, 21 Oct 2020 03:27:43 -0700 (PDT) Date: Wed, 21 Oct 2020 11:27:41 +0100 From: Cristian Marussi To: Thara Gopinath Subject: Re: [PATCH 03/11] firmware: arm_scmi: introduce common protocol interface Message-ID: <20201021102741.GB20482@e120937-lin> References: <20201014150545.44807-1-cristian.marussi@arm.com> <20201014150545.44807-4-cristian.marussi@arm.com> <64254fdf-dcb3-b27f-9624-de2abacf55d2@linaro.org> MIME-Version: 1.0 Content-Disposition: inline In-Reply-To: <64254fdf-dcb3-b27f-9624-de2abacf55d2@linaro.org> User-Agent: Mutt/1.9.4 (2018-02-28) X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201021_062750_952801_BDB61F86 X-CRM114-Status: GOOD ( 39.57 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: f.fainelli@gmail.com, vincent.guittot@linaro.org, sudeep.holla@arm.com, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, james.quinlan@broadcom.com, Jonathan.Cameron@Huawei.com, souvik.chakravarty@arm.com, etienne.carriere@linaro.org, lukasz.luba@arm.com Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Tue, Oct 20, 2020 at 10:47:10PM -0400, Thara Gopinath wrote: > > > On 10/14/20 11:05 AM, Cristian Marussi wrote: > > Introduce generic get_ops/put_ops handle operations: any protocol, both > > standard or custom, now exposes its operations through this common > > interface which internally takes care to account for protocols' usage: > > protocols' initialization is now performed on demand as soon as the first > > user shows up while deinitialization (if any) is performed once > > the last user of a protocol has gone. > > Registered events' notifier are tracked too against the related protocol. > > Convert all SCMI drivers to the new interface too. > > > > Signed-off-by: Cristian Marussi > > --- > > [...] > > > > diff --git a/drivers/firmware/arm_scmi/driver.c b/drivers/firmware/arm_scmi/driver.c > > index bad1d0130e96..049220efd227 100644 > > --- a/drivers/firmware/arm_scmi/driver.c > > +++ b/drivers/firmware/arm_scmi/driver.c > > @@ -585,7 +585,7 @@ void *scmi_get_proto_priv(const struct scmi_handle *handle, u8 protocol_id) > > * Return: A reference to an initialized protocol instance or error on failure. > > */ > > static struct scmi_protocol_instance * __must_check > > -scmi_get_protocol_instance(struct scmi_handle *handle, u8 protocol_id) > > +scmi_get_protocol_instance(const struct scmi_handle *handle, u8 protocol_id) > > { > > int ret = -ENOMEM; > > void *gid; > > @@ -655,7 +655,7 @@ scmi_get_protocol_instance(struct scmi_handle *handle, u8 protocol_id) > > * > > * Return: 0 if protocol was acquired successfully. > > */ > > -int scmi_acquire_protocol(struct scmi_handle *handle, u8 protocol_id) > > +int scmi_acquire_protocol(const struct scmi_handle *handle, u8 protocol_id) > > { > > return IS_ERR(scmi_get_protocol_instance(handle, protocol_id)); > > } > > @@ -668,7 +668,7 @@ int scmi_acquire_protocol(struct scmi_handle *handle, u8 protocol_id) > > * Remove one user for the specified protocol and triggers de-initialization > > * and resources de-allocation once the last user has gone. > > */ > > -void scmi_release_protocol(struct scmi_handle *handle, u8 protocol_id) > > +void scmi_release_protocol(const struct scmi_handle *handle, u8 protocol_id) > > { > > struct scmi_info *info = handle_to_scmi_info(handle); > > struct scmi_protocol_instance *pi; > > @@ -700,6 +700,29 @@ void scmi_release_protocol(struct scmi_handle *handle, u8 protocol_id) > > mutex_unlock(&info->protocols_mtx); > > } > > +/** > > + * scmi_get_protocol_operations - Get protocol operations > > + * @handle: A reference to the SCMI platform instance. > > + * @protocol_id: The protocol being requested. > > + * > > + * Get hold of a protocol accounting for its usage, eventually triggering its > > + * initialization, and returning the protocol specific operations. > > + * > > + * Return: A reference to the requested protocol operations or error. > > + * Must be checked for errors by caller. > > + */ > > +static const void __must_check > > +*scmi_get_protocol_operations(const struct scmi_handle *handle, u8 protocol_id) > > +{ > > + struct scmi_protocol_instance *pi; > > + > > + pi = scmi_get_protocol_instance(handle, protocol_id); > > + if (IS_ERR(pi)) > > + return pi; > > + > > + return pi->proto->ops; > > +} > + > > void scmi_setup_protocol_implemented(const struct scmi_handle *handle, > > u8 *prot_imp) > > { > > @@ -975,6 +998,8 @@ static int scmi_probe(struct platform_device *pdev) > > handle = &info->handle; > > handle->dev = info->dev; > > handle->version = &info->version; > > + handle->get_ops = scmi_get_protocol_operations; > > + handle->put_ops = scmi_release_protocol; > > > Why do you need get_ops and put_ops? Why not have the drivers call > scmi_acquire_protocol and scmi_release_protocol directly and get the ops > from retrieved scmi_get_protocol_instance ? IMHO, this makes it more > readable. Also, this will make the usage of scmi_acquire_protocol and > scmi_release_protocol more consistent. Right now, notify.c uses > scmi_acquire_protocol to acquire protocol because there is no need for ops > and other drivers use get_ops to acquire protocol. Kind of confusing.. > Trying to avoid exporting new synbols if not strictly needed, I exposed get_ops()/put_ops() via handle for the usage of the SCMI drivers users, while keeping scmi_acquire/release as internal non-exported wrappers used only by the SCMI core itself like notifications. You cannot call acquire/release from a loadable module as of now. Additionally I thougt to add these wrappers for cases in which like notifications you don't need the ops really (like notif or base) nor the related forced __must_check(like notif), but just to get hold of the protocol to avoid it being possibly unloaded. I would antyway keep the get_ops/put_ops and I could just drop acquire/release if confusing and use the raw ops methods also internally, properly checking for the result everytime: currently notifications core takes care to acquire a protocol only once the requested event has been registered by some protocol (i.e. event handler is NOT pending) so that I do not trigger a protocol initialization when registering a notifier against a still unknown event: as a consequence acquire/release when called in the notif context cannot fail, so I don;t check. I'll try to simplify this though. Regards Cristian > -- > Warm Regards > Thara > > > ret = scmi_txrx_setup(info, dev, SCMI_PROTOCOL_BASE); > > if (ret) > > diff --git a/drivers/firmware/arm_scmi/notify.c b/drivers/firmware/arm_scmi/notify.c > > index eae58b2a92cc..02b00af9b08f 100644 > > --- a/drivers/firmware/arm_scmi/notify.c > > +++ b/drivers/firmware/arm_scmi/notify.c > > @@ -367,7 +367,7 @@ static struct scmi_event_handler * > > scmi_get_active_handler(struct scmi_notify_instance *ni, u32 evt_key); > > static void scmi_put_active_handler(struct scmi_notify_instance *ni, > > struct scmi_event_handler *hndl); > > -static void scmi_put_handler_unlocked(struct scmi_notify_instance *ni, > > +static bool scmi_put_handler_unlocked(struct scmi_notify_instance *ni, > > struct scmi_event_handler *hndl); > > /** > > @@ -899,9 +899,21 @@ static inline int scmi_bind_event_handler(struct scmi_notify_instance *ni, > > if (!r_evt) > > return -EINVAL; > > - /* Remove from pending and insert into registered */ > > + /* > > + * Remove from pending and insert into registered while getting hold > > + * of protocol instance. > > + */ > > hash_del(&hndl->hash); > > + /* > > + * Acquire protocols only for NON pending handlers, so as NOT to trigger > > + * protocol initialization when a notifier is registered against a still > > + * not registered protocol, since it would make little sense to force init > > + * protocols for which still no SCMI driver user exists: they wouldn't > > + * emit any event anyway till some SCMI driver starts using it. > > + */ > > + scmi_acquire_protocol(ni->handle, KEY_XTRACT_PROTO_ID(hndl->key)); > > hndl->r_evt = r_evt; > > + > > mutex_lock(&r_evt->proto->registered_mtx); > > hash_add(r_evt->proto->registered_events_handlers, > > &hndl->hash, hndl->key); > > @@ -1192,41 +1204,65 @@ static int scmi_disable_events(struct scmi_event_handler *hndl) > > * * unregister and free the handler itself > > * > > * Context: Assumes all the proper locking has been managed by the caller. > > + * > > + * Return: True if handler was freed (users dropped to zero) > > */ > > -static void scmi_put_handler_unlocked(struct scmi_notify_instance *ni, > > +static bool scmi_put_handler_unlocked(struct scmi_notify_instance *ni, > > struct scmi_event_handler *hndl) > > { > > + bool freed = false; > > + > > if (refcount_dec_and_test(&hndl->users)) { > > if (!IS_HNDL_PENDING(hndl)) > > scmi_disable_events(hndl); > > scmi_free_event_handler(hndl); > > + freed = true; > > } > > + > > + return freed; > > } > > static void scmi_put_handler(struct scmi_notify_instance *ni, > > struct scmi_event_handler *hndl) > > { > > + bool freed; > > + u8 protocol_id; > > struct scmi_registered_event *r_evt = hndl->r_evt; > > mutex_lock(&ni->pending_mtx); > > - if (r_evt) > > + if (r_evt) { > > + protocol_id = r_evt->proto->id; > > mutex_lock(&r_evt->proto->registered_mtx); > > + } > > - scmi_put_handler_unlocked(ni, hndl); > > + freed = scmi_put_handler_unlocked(ni, hndl); > > - if (r_evt) > > + if (r_evt) { > > mutex_unlock(&r_evt->proto->registered_mtx); > > + /* > > + * Only registered handler acquired protocol; must be here > > + * released only AFTER unlocking registered_mtx, since > > + * releasing a protocol can trigger its de-initialization > > + * (ie. including r_evt and registered_mtx) > > + */ > > + if (freed) > > + scmi_release_protocol(ni->handle, protocol_id); > > + } > > mutex_unlock(&ni->pending_mtx); > > } > > static void scmi_put_active_handler(struct scmi_notify_instance *ni, > > struct scmi_event_handler *hndl) > > { > > + bool freed; > > struct scmi_registered_event *r_evt = hndl->r_evt; > > + u8 protocol_id = r_evt->proto->id; > > mutex_lock(&r_evt->proto->registered_mtx); > > - scmi_put_handler_unlocked(ni, hndl); > > + freed = scmi_put_handler_unlocked(ni, hndl); > > mutex_unlock(&r_evt->proto->registered_mtx); > > + if (freed) > > + scmi_release_protocol(ni->handle, protocol_id); > > } > > /** > > diff --git a/drivers/firmware/arm_scmi/perf.c b/drivers/firmware/arm_scmi/perf.c > > index 13e215f359fb..bd9cb2583557 100644 > > --- a/drivers/firmware/arm_scmi/perf.c > > +++ b/drivers/firmware/arm_scmi/perf.c > > @@ -857,7 +857,7 @@ static const struct scmi_event_ops perf_event_ops = { > > .fill_custom_report = scmi_perf_fill_custom_report, > > }; > > -static int scmi_perf_protocol_init(struct scmi_handle *handle) > > +static int scmi_perf_protocol_init(const struct scmi_handle *handle) > > { > > int domain; > > u32 version; > > @@ -896,7 +896,6 @@ static int scmi_perf_protocol_init(struct scmi_handle *handle) > > pinfo->num_domains); > > pinfo->version = version; > > - handle->perf_ops = &perf_ops; > > return scmi_set_proto_priv(handle, SCMI_PROTOCOL_PERF, pinfo); > > } > > diff --git a/drivers/firmware/arm_scmi/power.c b/drivers/firmware/arm_scmi/power.c > > index e0b29ed4e09a..1e026b5530a7 100644 > > --- a/drivers/firmware/arm_scmi/power.c > > +++ b/drivers/firmware/arm_scmi/power.c > > @@ -262,7 +262,7 @@ static const struct scmi_event_ops power_event_ops = { > > .fill_custom_report = scmi_power_fill_custom_report, > > }; > > -static int scmi_power_protocol_init(struct scmi_handle *handle) > > +static int scmi_power_protocol_init(const struct scmi_handle *handle) > > { > > int domain; > > u32 version; > > @@ -297,7 +297,6 @@ static int scmi_power_protocol_init(struct scmi_handle *handle) > > pinfo->num_domains); > > pinfo->version = version; > > - handle->power_ops = &power_ops; > > return scmi_set_proto_priv(handle, SCMI_PROTOCOL_POWER, pinfo); > > } > > diff --git a/drivers/firmware/arm_scmi/reset.c b/drivers/firmware/arm_scmi/reset.c > > index f70e9b5108d5..b7da4de0e56e 100644 > > --- a/drivers/firmware/arm_scmi/reset.c > > +++ b/drivers/firmware/arm_scmi/reset.c > > @@ -274,7 +274,7 @@ static const struct scmi_event_ops reset_event_ops = { > > .fill_custom_report = scmi_reset_fill_custom_report, > > }; > > -static int scmi_reset_protocol_init(struct scmi_handle *handle) > > +static int scmi_reset_protocol_init(const struct scmi_handle *handle) > > { > > int domain; > > u32 version; > > @@ -309,7 +309,6 @@ static int scmi_reset_protocol_init(struct scmi_handle *handle) > > pinfo->num_domains); > > pinfo->version = version; > > - handle->reset_ops = &reset_ops; > > return scmi_set_proto_priv(handle, SCMI_PROTOCOL_RESET, pinfo); > > } > > diff --git a/drivers/firmware/arm_scmi/scmi_pm_domain.c b/drivers/firmware/arm_scmi/scmi_pm_domain.c > > index 9e44479f0284..bfea56f77890 100644 > > --- a/drivers/firmware/arm_scmi/scmi_pm_domain.c > > +++ b/drivers/firmware/arm_scmi/scmi_pm_domain.c > > @@ -2,7 +2,7 @@ > > /* > > * SCMI Generic power domain support. > > * > > - * Copyright (C) 2018 ARM Ltd. > > + * Copyright (C) 2018-2020 ARM Ltd. > > */ > > #include > > @@ -11,6 +11,8 @@ > > #include > > #include > > +static const struct scmi_power_ops *power_ops; > > + > > struct scmi_pm_domain { > > struct generic_pm_domain genpd; > > const struct scmi_handle *handle; > > @@ -25,16 +27,15 @@ static int scmi_pd_power(struct generic_pm_domain *domain, bool power_on) > > int ret; > > u32 state, ret_state; > > struct scmi_pm_domain *pd = to_scmi_pd(domain); > > - const struct scmi_power_ops *ops = pd->handle->power_ops; > > if (power_on) > > state = SCMI_POWER_STATE_GENERIC_ON; > > else > > state = SCMI_POWER_STATE_GENERIC_OFF; > > - ret = ops->state_set(pd->handle, pd->domain, state); > > + ret = power_ops->state_set(pd->handle, pd->domain, state); > > if (!ret) > > - ret = ops->state_get(pd->handle, pd->domain, &ret_state); > > + ret = power_ops->state_get(pd->handle, pd->domain, &ret_state); > > if (!ret && state != ret_state) > > return -EIO; > > @@ -61,10 +62,14 @@ static int scmi_pm_domain_probe(struct scmi_device *sdev) > > struct generic_pm_domain **domains; > > const struct scmi_handle *handle = sdev->handle; > > - if (!handle || !handle->power_ops) > > + if (!handle) > > return -ENODEV; > > - num_domains = handle->power_ops->num_domains_get(handle); > > + power_ops = handle->get_ops(handle, SCMI_PROTOCOL_POWER); > > + if (IS_ERR(power_ops)) > > + return PTR_ERR(power_ops); > > + > > + num_domains = power_ops->num_domains_get(handle); > > if (num_domains < 0) { > > dev_err(dev, "number of domains not found\n"); > > return num_domains; > > @@ -85,14 +90,14 @@ static int scmi_pm_domain_probe(struct scmi_device *sdev) > > for (i = 0; i < num_domains; i++, scmi_pd++) { > > u32 state; > > - if (handle->power_ops->state_get(handle, i, &state)) { > > + if (power_ops->state_get(handle, i, &state)) { > > dev_warn(dev, "failed to get state for domain %d\n", i); > > continue; > > } > > scmi_pd->domain = i; > > scmi_pd->handle = handle; > > - scmi_pd->name = handle->power_ops->name_get(handle, i); > > + scmi_pd->name = power_ops->name_get(handle, i); > > scmi_pd->genpd.name = scmi_pd->name; > > scmi_pd->genpd.power_off = scmi_pd_power_off; > > scmi_pd->genpd.power_on = scmi_pd_power_on; > > @@ -111,6 +116,13 @@ static int scmi_pm_domain_probe(struct scmi_device *sdev) > > return 0; > > } > > +static void scmi_pm_domain_remove(struct scmi_device *sdev) > > +{ > > + const struct scmi_handle *handle = sdev->handle; > > + > > + handle->put_ops(handle, SCMI_PROTOCOL_POWER); > > +} > > + > > static const struct scmi_device_id scmi_id_table[] = { > > { SCMI_PROTOCOL_POWER, "genpd" }, > > { }, > > @@ -120,6 +132,7 @@ MODULE_DEVICE_TABLE(scmi, scmi_id_table); > > static struct scmi_driver scmi_power_domain_driver = { > > .name = "scmi-power-domain", > > .probe = scmi_pm_domain_probe, > > + .remove = scmi_pm_domain_remove, > > .id_table = scmi_id_table, > > }; > > module_scmi_driver(scmi_power_domain_driver); > > diff --git a/drivers/firmware/arm_scmi/sensors.c b/drivers/firmware/arm_scmi/sensors.c > > index 8a0a599558ba..e0129dcd322f 100644 > > --- a/drivers/firmware/arm_scmi/sensors.c > > +++ b/drivers/firmware/arm_scmi/sensors.c > > @@ -334,7 +334,7 @@ static const struct scmi_event_ops sensor_event_ops = { > > .fill_custom_report = scmi_sensor_fill_custom_report, > > }; > > -static int scmi_sensors_protocol_init(struct scmi_handle *handle) > > +static int scmi_sensors_protocol_init(const struct scmi_handle *handle) > > { > > u32 version; > > struct sensors_info *sinfo; > > @@ -364,7 +364,6 @@ static int scmi_sensors_protocol_init(struct scmi_handle *handle) > > sinfo->num_sensors); > > sinfo->version = version; > > - handle->sensor_ops = &sensor_ops; > > return scmi_set_proto_priv(handle, SCMI_PROTOCOL_SENSOR, sinfo); > > } > > diff --git a/drivers/firmware/arm_scmi/system.c b/drivers/firmware/arm_scmi/system.c > > index 8f53f93c63ca..30e3510c1f07 100644 > > --- a/drivers/firmware/arm_scmi/system.c > > +++ b/drivers/firmware/arm_scmi/system.c > > @@ -101,7 +101,7 @@ static const struct scmi_event_ops system_event_ops = { > > .fill_custom_report = scmi_system_fill_custom_report, > > }; > > -static int scmi_system_protocol_init(struct scmi_handle *handle) > > +static int scmi_system_protocol_init(const struct scmi_handle *handle) > > { > > u32 version; > > struct scmi_system_info *pinfo; > > diff --git a/drivers/hwmon/scmi-hwmon.c b/drivers/hwmon/scmi-hwmon.c > > index d421e691318b..27ef71996a15 100644 > > --- a/drivers/hwmon/scmi-hwmon.c > > +++ b/drivers/hwmon/scmi-hwmon.c > > @@ -2,7 +2,7 @@ > > /* > > * System Control and Management Interface(SCMI) based hwmon sensor driver > > * > > - * Copyright (C) 2018 ARM Ltd. > > + * Copyright (C) 2018-2020 ARM Ltd. > > * Sudeep Holla > > */ > > @@ -13,6 +13,8 @@ > > #include > > #include > > +static const struct scmi_sensor_ops *sensor_ops; > > + > > struct scmi_sensors { > > const struct scmi_handle *handle; > > const struct scmi_sensor_info **info[hwmon_max]; > > @@ -72,7 +74,7 @@ static int scmi_hwmon_read(struct device *dev, enum hwmon_sensor_types type, > > const struct scmi_handle *h = scmi_sensors->handle; > > sensor = *(scmi_sensors->info[type] + channel); > > - ret = h->sensor_ops->reading_get(h, sensor->id, &value); > > + ret = sensor_ops->reading_get(h, sensor->id, &value); > > if (ret) > > return ret; > > @@ -170,10 +172,14 @@ static int scmi_hwmon_probe(struct scmi_device *sdev) > > const struct hwmon_channel_info **ptr_scmi_ci; > > const struct scmi_handle *handle = sdev->handle; > > - if (!handle || !handle->sensor_ops) > > + if (!handle) > > return -ENODEV; > > - nr_sensors = handle->sensor_ops->count_get(handle); > > + sensor_ops = handle->get_ops(handle, SCMI_PROTOCOL_SENSOR); > > + if (IS_ERR(sensor_ops)) > > + return PTR_ERR(sensor_ops); > > + > > + nr_sensors = sensor_ops->count_get(handle); > > if (!nr_sensors) > > return -EIO; > > @@ -184,7 +190,7 @@ static int scmi_hwmon_probe(struct scmi_device *sdev) > > scmi_sensors->handle = handle; > > for (i = 0; i < nr_sensors; i++) { > > - sensor = handle->sensor_ops->info_get(handle, i); > > + sensor = sensor_ops->info_get(handle, i); > > if (!sensor) > > return -EINVAL; > > @@ -234,7 +240,7 @@ static int scmi_hwmon_probe(struct scmi_device *sdev) > > } > > for (i = nr_sensors - 1; i >= 0 ; i--) { > > - sensor = handle->sensor_ops->info_get(handle, i); > > + sensor = sensor_ops->info_get(handle, i); > > if (!sensor) > > continue; > > @@ -258,6 +264,13 @@ static int scmi_hwmon_probe(struct scmi_device *sdev) > > return PTR_ERR_OR_ZERO(hwdev); > > } > > +static void scmi_hwmon_remove(struct scmi_device *sdev) > > +{ > > + const struct scmi_handle *handle = sdev->handle; > > + > > + handle->put_ops(handle, SCMI_PROTOCOL_SENSOR); > > +} > > + > > static const struct scmi_device_id scmi_id_table[] = { > > { SCMI_PROTOCOL_SENSOR, "hwmon" }, > > { }, > > @@ -267,6 +280,7 @@ MODULE_DEVICE_TABLE(scmi, scmi_id_table); > > static struct scmi_driver scmi_hwmon_drv = { > > .name = "scmi-hwmon", > > .probe = scmi_hwmon_probe, > > + .remove = scmi_hwmon_remove, > > .id_table = scmi_id_table, > > }; > > module_scmi_driver(scmi_hwmon_drv); > > diff --git a/drivers/reset/reset-scmi.c b/drivers/reset/reset-scmi.c > > index 8d3a858e3b19..e48220dedb35 100644 > > --- a/drivers/reset/reset-scmi.c > > +++ b/drivers/reset/reset-scmi.c > > @@ -2,7 +2,7 @@ > > /* > > * ARM System Control and Management Interface (ARM SCMI) reset driver > > * > > - * Copyright (C) 2019 ARM Ltd. > > + * Copyright (C) 2019-2020 ARM Ltd. > > */ > > #include > > @@ -11,6 +11,8 @@ > > #include > > #include > > +static const struct scmi_reset_ops *reset_ops; > > + > > /** > > * struct scmi_reset_data - reset controller information structure > > * @rcdev: reset controller entity > > @@ -39,7 +41,7 @@ scmi_reset_assert(struct reset_controller_dev *rcdev, unsigned long id) > > { > > const struct scmi_handle *handle = to_scmi_handle(rcdev); > > - return handle->reset_ops->assert(handle, id); > > + return reset_ops->assert(handle, id); > > } > > /** > > @@ -57,7 +59,7 @@ scmi_reset_deassert(struct reset_controller_dev *rcdev, unsigned long id) > > { > > const struct scmi_handle *handle = to_scmi_handle(rcdev); > > - return handle->reset_ops->deassert(handle, id); > > + return reset_ops->deassert(handle, id); > > } > > /** > > @@ -75,7 +77,7 @@ scmi_reset_reset(struct reset_controller_dev *rcdev, unsigned long id) > > { > > const struct scmi_handle *handle = to_scmi_handle(rcdev); > > - return handle->reset_ops->reset(handle, id); > > + return reset_ops->reset(handle, id); > > } > > static const struct reset_control_ops scmi_reset_ops = { > > @@ -91,9 +93,13 @@ static int scmi_reset_probe(struct scmi_device *sdev) > > struct device_node *np = dev->of_node; > > const struct scmi_handle *handle = sdev->handle; > > - if (!handle || !handle->reset_ops) > > + if (!handle) > > return -ENODEV; > > + reset_ops = handle->get_ops(handle, SCMI_PROTOCOL_RESET); > > + if (IS_ERR(reset_ops)) > > + return PTR_ERR(reset_ops); > > + > > data = devm_kzalloc(dev, sizeof(*data), GFP_KERNEL); > > if (!data) > > return -ENOMEM; > > @@ -101,12 +107,19 @@ static int scmi_reset_probe(struct scmi_device *sdev) > > data->rcdev.ops = &scmi_reset_ops; > > data->rcdev.owner = THIS_MODULE; > > data->rcdev.of_node = np; > > - data->rcdev.nr_resets = handle->reset_ops->num_domains_get(handle); > > + data->rcdev.nr_resets = reset_ops->num_domains_get(handle); > > data->handle = handle; > > return devm_reset_controller_register(dev, &data->rcdev); > > } > > +static void scmi_reset_remove(struct scmi_device *sdev) > > +{ > > + const struct scmi_handle *handle = sdev->handle; > > + > > + handle->put_ops(handle, SCMI_PROTOCOL_RESET); > > +} > > + > > static const struct scmi_device_id scmi_id_table[] = { > > { SCMI_PROTOCOL_RESET, "reset" }, > > { }, > > @@ -116,6 +129,7 @@ MODULE_DEVICE_TABLE(scmi, scmi_id_table); > > static struct scmi_driver scmi_reset_driver = { > > .name = "scmi-reset", > > .probe = scmi_reset_probe, > > + .remove = scmi_reset_remove, > > .id_table = scmi_id_table, > > }; > > module_scmi_driver(scmi_reset_driver); > > diff --git a/include/linux/scmi_protocol.h b/include/linux/scmi_protocol.h > > index bc4f06d46bfb..bfe7017cff19 100644 > > --- a/include/linux/scmi_protocol.h > > +++ b/include/linux/scmi_protocol.h > > @@ -257,11 +257,6 @@ struct scmi_notify_ops { > > * > > * @dev: pointer to the SCMI device > > * @version: pointer to the structure containing SCMI version information > > - * @power_ops: pointer to set of power protocol operations > > - * @perf_ops: pointer to set of performance protocol operations > > - * @clk_ops: pointer to set of clock protocol operations > > - * @sensor_ops: pointer to set of sensor protocol operations > > - * @reset_ops: pointer to set of reset protocol operations > > * @notify_ops: pointer to set of notifications related operations > > * @notify_priv: pointer to private data structure specific to notifications > > * (for internal use only) > > @@ -269,11 +264,11 @@ struct scmi_notify_ops { > > struct scmi_handle { > > struct device *dev; > > struct scmi_revision_info *version; > > - const struct scmi_perf_ops *perf_ops; > > - const struct scmi_clk_ops *clk_ops; > > - const struct scmi_power_ops *power_ops; > > - const struct scmi_sensor_ops *sensor_ops; > > - const struct scmi_reset_ops *reset_ops; > > + > > + const void __must_check *(*get_ops)(const struct scmi_handle *handle, > > + u8 proto); > > + void (*put_ops)(const struct scmi_handle *handle, u8 proto); > > + > > const struct scmi_notify_ops *notify_ops; > > void *notify_priv; > > }; > > > > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel