From patchwork Wed Oct 14 15:05:37 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Cristian Marussi X-Patchwork-Id: 11837835 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 0E958921 for ; Wed, 14 Oct 2020 15:07:30 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id C682221582 for ; Wed, 14 Oct 2020 15:07:29 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="aU4hrIfx" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org C682221582 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:MIME-Version:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:References:In-Reply-To:Message-Id:Date:Subject:To: From:Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=Z+Posy4ef6OreIPYkNGEWPI8bjePzzP4iXDA+wtkCr8=; b=aU4hrIfxwVW73g7sfKGrHq6PsB bU2aggOvxW4RMcsmEnfTthHk30XJsRSo9/Qtw5YOT9yOE6bmXxawDwpwWEiW1cT6ou/ikgsm3kpHi TpfIQztDOMinXsHs+Qo+4jAPSknRhteTv/b6tLxcicFQRQrs6OP9Tu0M/YW8PdRWFYpwhiJvWvThE 4DVvshwUIvwx9M0b406HIj8q8Y2XGA+lFsYo7pxrynEqE0PAdPnQMFGrnp8HuSpB+3yglup31gi/1 NmsLdp6/iFD9AVrHEthVhNv8JZbIEtLEwHZLDzs0Udz6jsA7R72hRtd3tIXZAK/LFNI7VM4tHLLiQ YarzqrFg==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1kSiN0-0001OW-RF; Wed, 14 Oct 2020 15:07:14 +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 1kSiMl-0001If-Dk for linux-arm-kernel@lists.infradead.org; Wed, 14 Oct 2020 15:07:02 +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 1D4CC1435; Wed, 14 Oct 2020 08:06:59 -0700 (PDT) Received: from e120937-lin.home (unknown [172.31.20.19]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 793DA3F71F; Wed, 14 Oct 2020 08:06:57 -0700 (PDT) From: Cristian Marussi To: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Subject: [PATCH 03/11] firmware: arm_scmi: introduce common protocol interface Date: Wed, 14 Oct 2020 16:05:37 +0100 Message-Id: <20201014150545.44807-4-cristian.marussi@arm.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20201014150545.44807-1-cristian.marussi@arm.com> References: <20201014150545.44807-1-cristian.marussi@arm.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201014_110659_639551_84DBFA0A X-CRM114-Status: GOOD ( 26.74 ) X-Spam-Score: -2.3 (--) X-Spam-Report: SpamAssassin version 3.4.4 on merlin.infradead.org summary: Content analysis details: (-2.3 points) pts rule name description ---- ---------------------- -------------------------------------------------- -2.3 RCVD_IN_DNSWL_MED RBL: Sender listed at https://www.dnswl.org/, medium trust [217.140.110.172 listed in list.dnswl.org] 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record -0.0 SPF_PASS SPF: sender matches SPF record 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, thara.gopinath@linaro.org, cristian.marussi@arm.com, james.quinlan@broadcom.com, Jonathan.Cameron@Huawei.com, souvik.chakravarty@arm.com, etienne.carriere@linaro.org, lukasz.luba@arm.com MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org 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 --- drivers/clk/clk-scmi.c | 30 +++++++++---- drivers/cpufreq/scmi-cpufreq.c | 28 ++++++------ drivers/firmware/arm_scmi/base.c | 2 +- drivers/firmware/arm_scmi/bus.c | 24 ----------- drivers/firmware/arm_scmi/clock.c | 4 +- drivers/firmware/arm_scmi/common.h | 6 +-- drivers/firmware/arm_scmi/driver.c | 31 ++++++++++++-- drivers/firmware/arm_scmi/notify.c | 50 +++++++++++++++++++--- drivers/firmware/arm_scmi/perf.c | 3 +- drivers/firmware/arm_scmi/power.c | 3 +- drivers/firmware/arm_scmi/reset.c | 3 +- drivers/firmware/arm_scmi/scmi_pm_domain.c | 29 +++++++++---- drivers/firmware/arm_scmi/sensors.c | 3 +- drivers/firmware/arm_scmi/system.c | 2 +- drivers/hwmon/scmi-hwmon.c | 26 ++++++++--- drivers/reset/reset-scmi.c | 26 ++++++++--- include/linux/scmi_protocol.h | 15 +++---- 17 files changed, 185 insertions(+), 100 deletions(-) diff --git a/drivers/clk/clk-scmi.c b/drivers/clk/clk-scmi.c index c754dfbb73fd..4801a2df044b 100644 --- a/drivers/clk/clk-scmi.c +++ b/drivers/clk/clk-scmi.c @@ -2,7 +2,7 @@ /* * System Control and Power Interface (SCMI) Protocol based clock driver * - * Copyright (C) 2018 ARM Ltd. + * Copyright (C) 2018-2020 ARM Ltd. */ #include @@ -13,6 +13,8 @@ #include #include +static const struct scmi_clk_ops *clk_ops; + struct scmi_clk { u32 id; struct clk_hw hw; @@ -29,7 +31,7 @@ static unsigned long scmi_clk_recalc_rate(struct clk_hw *hw, u64 rate; struct scmi_clk *clk = to_scmi_clk(hw); - ret = clk->handle->clk_ops->rate_get(clk->handle, clk->id, &rate); + ret = clk_ops->rate_get(clk->handle, clk->id, &rate); if (ret) return 0; return rate; @@ -69,21 +71,21 @@ static int scmi_clk_set_rate(struct clk_hw *hw, unsigned long rate, { struct scmi_clk *clk = to_scmi_clk(hw); - return clk->handle->clk_ops->rate_set(clk->handle, clk->id, rate); + return clk_ops->rate_set(clk->handle, clk->id, rate); } static int scmi_clk_enable(struct clk_hw *hw) { struct scmi_clk *clk = to_scmi_clk(hw); - return clk->handle->clk_ops->enable(clk->handle, clk->id); + return clk_ops->enable(clk->handle, clk->id); } static void scmi_clk_disable(struct clk_hw *hw) { struct scmi_clk *clk = to_scmi_clk(hw); - clk->handle->clk_ops->disable(clk->handle, clk->id); + clk_ops->disable(clk->handle, clk->id); } static const struct clk_ops scmi_clk_ops = { @@ -143,10 +145,14 @@ static int scmi_clocks_probe(struct scmi_device *sdev) struct device_node *np = dev->of_node; const struct scmi_handle *handle = sdev->handle; - if (!handle || !handle->clk_ops) + if (!handle) return -ENODEV; - count = handle->clk_ops->count_get(handle); + clk_ops = handle->get_ops(handle, SCMI_PROTOCOL_CLOCK); + if (IS_ERR(clk_ops)) + return PTR_ERR(clk_ops); + + count = clk_ops->count_get(handle); if (count < 0) { dev_err(dev, "%pOFn: invalid clock output count\n", np); return -EINVAL; @@ -167,7 +173,7 @@ static int scmi_clocks_probe(struct scmi_device *sdev) if (!sclk) return -ENOMEM; - sclk->info = handle->clk_ops->info_get(handle, idx); + sclk->info = clk_ops->info_get(handle, idx); if (!sclk->info) { dev_dbg(dev, "invalid clock info for idx %d\n", idx); continue; @@ -191,6 +197,13 @@ static int scmi_clocks_probe(struct scmi_device *sdev) clk_data); } +static void scmi_clocks_remove(struct scmi_device *sdev) +{ + const struct scmi_handle *handle = sdev->handle; + + handle->put_ops(handle, SCMI_PROTOCOL_CLOCK); +} + static const struct scmi_device_id scmi_id_table[] = { { SCMI_PROTOCOL_CLOCK, "clocks" }, { }, @@ -200,6 +213,7 @@ MODULE_DEVICE_TABLE(scmi, scmi_id_table); static struct scmi_driver scmi_clocks_driver = { .name = "scmi-clocks", .probe = scmi_clocks_probe, + .remove = scmi_clocks_remove, .id_table = scmi_id_table, }; module_scmi_driver(scmi_clocks_driver); diff --git a/drivers/cpufreq/scmi-cpufreq.c b/drivers/cpufreq/scmi-cpufreq.c index 46b268095421..280597b3c6fd 100644 --- a/drivers/cpufreq/scmi-cpufreq.c +++ b/drivers/cpufreq/scmi-cpufreq.c @@ -25,11 +25,11 @@ struct scmi_data { }; static const struct scmi_handle *handle; +static const struct scmi_perf_ops *perf_ops; static unsigned int scmi_cpufreq_get_rate(unsigned int cpu) { struct cpufreq_policy *policy = cpufreq_cpu_get_raw(cpu); - const struct scmi_perf_ops *perf_ops = handle->perf_ops; struct scmi_data *priv = policy->driver_data; unsigned long rate; int ret; @@ -50,7 +50,6 @@ scmi_cpufreq_set_target(struct cpufreq_policy *policy, unsigned int index) { int ret; struct scmi_data *priv = policy->driver_data; - const struct scmi_perf_ops *perf_ops = handle->perf_ops; u64 freq = policy->freq_table[index].frequency; ret = perf_ops->freq_set(handle, priv->domain_id, freq * 1000, false); @@ -64,7 +63,6 @@ static unsigned int scmi_cpufreq_fast_switch(struct cpufreq_policy *policy, unsigned int target_freq) { struct scmi_data *priv = policy->driver_data; - const struct scmi_perf_ops *perf_ops = handle->perf_ops; if (!perf_ops->freq_set(handle, priv->domain_id, target_freq * 1000, true)) { @@ -82,7 +80,7 @@ scmi_get_sharing_cpus(struct device *cpu_dev, struct cpumask *cpumask) int cpu, domain, tdomain; struct device *tcpu_dev; - domain = handle->perf_ops->device_domain_id(cpu_dev); + domain = perf_ops->device_domain_id(cpu_dev); if (domain < 0) return domain; @@ -94,7 +92,7 @@ scmi_get_sharing_cpus(struct device *cpu_dev, struct cpumask *cpumask) if (!tcpu_dev) continue; - tdomain = handle->perf_ops->device_domain_id(tcpu_dev); + tdomain = perf_ops->device_domain_id(tcpu_dev); if (tdomain == domain) cpumask_set_cpu(cpu, cpumask); } @@ -109,13 +107,13 @@ scmi_get_cpu_power(unsigned long *power, unsigned long *KHz, unsigned long Hz; int ret, domain; - domain = handle->perf_ops->device_domain_id(cpu_dev); + domain = perf_ops->device_domain_id(cpu_dev); if (domain < 0) return domain; /* Get the power cost of the performance domain. */ Hz = *KHz * 1000; - ret = handle->perf_ops->est_power_get(handle, domain, &Hz, power); + ret = perf_ops->est_power_get(handle, domain, &Hz, power); if (ret) return ret; @@ -140,7 +138,7 @@ static int scmi_cpufreq_init(struct cpufreq_policy *policy) return -ENODEV; } - ret = handle->perf_ops->device_opps_add(handle, cpu_dev); + ret = perf_ops->device_opps_add(handle, cpu_dev); if (ret) { dev_warn(cpu_dev, "failed to add opps to the device\n"); return ret; @@ -179,7 +177,7 @@ static int scmi_cpufreq_init(struct cpufreq_policy *policy) } priv->cpu_dev = cpu_dev; - priv->domain_id = handle->perf_ops->device_domain_id(cpu_dev); + priv->domain_id = perf_ops->device_domain_id(cpu_dev); policy->driver_data = priv; policy->freq_table = freq_table; @@ -187,14 +185,14 @@ static int scmi_cpufreq_init(struct cpufreq_policy *policy) /* SCMI allows DVFS request for any domain from any CPU */ policy->dvfs_possible_from_any_cpu = true; - latency = handle->perf_ops->transition_latency_get(handle, cpu_dev); + latency = perf_ops->transition_latency_get(handle, cpu_dev); if (!latency) latency = CPUFREQ_ETERNAL; policy->cpuinfo.transition_latency = latency; policy->fast_switch_possible = - handle->perf_ops->fast_switch_possible(handle, cpu_dev); + perf_ops->fast_switch_possible(handle, cpu_dev); em_dev_register_perf_domain(cpu_dev, nr_opp, &em_cb, policy->cpus); @@ -239,9 +237,13 @@ static int scmi_cpufreq_probe(struct scmi_device *sdev) handle = sdev->handle; - if (!handle || !handle->perf_ops) + if (!handle) return -ENODEV; + perf_ops = handle->get_ops(handle, SCMI_PROTOCOL_PERF); + if (IS_ERR(perf_ops)) + return PTR_ERR(perf_ops); + ret = cpufreq_register_driver(&scmi_cpufreq_driver); if (ret) { dev_err(&sdev->dev, "%s: registering cpufreq failed, err: %d\n", @@ -254,6 +256,8 @@ static int scmi_cpufreq_probe(struct scmi_device *sdev) static void scmi_cpufreq_remove(struct scmi_device *sdev) { cpufreq_unregister_driver(&scmi_cpufreq_driver); + + handle->put_ops(handle, SCMI_PROTOCOL_PERF); } static const struct scmi_device_id scmi_id_table[] = { diff --git a/drivers/firmware/arm_scmi/base.c b/drivers/firmware/arm_scmi/base.c index f19e08ed4369..129633e6fff4 100644 --- a/drivers/firmware/arm_scmi/base.c +++ b/drivers/firmware/arm_scmi/base.c @@ -318,7 +318,7 @@ static const struct scmi_event_ops base_event_ops = { .fill_custom_report = scmi_base_fill_custom_report, }; -static int scmi_base_protocol_init(struct scmi_handle *h) +static int scmi_base_protocol_init(const struct scmi_handle *h) { int id, ret; u8 *prot_imp; diff --git a/drivers/firmware/arm_scmi/bus.c b/drivers/firmware/arm_scmi/bus.c index afa2e4818a2b..3a2be1193c85 100644 --- a/drivers/firmware/arm_scmi/bus.c +++ b/drivers/firmware/arm_scmi/bus.c @@ -66,27 +66,11 @@ const struct scmi_protocol *scmi_get_protocol(int protocol_id) return proto; } -static int scmi_protocol_init(int protocol_id, struct scmi_handle *handle) -{ - const struct scmi_protocol *proto; - - proto = idr_find(&scmi_available_protocols, protocol_id); - if (!proto) - return -EINVAL; - return proto->init(handle); -} - -static int scmi_protocol_dummy_init(struct scmi_handle *handle) -{ - return 0; -} - static int scmi_dev_probe(struct device *dev) { struct scmi_driver *scmi_drv = to_scmi_driver(dev->driver); struct scmi_device *scmi_dev = to_scmi_dev(dev); const struct scmi_device_id *id; - int ret; id = scmi_dev_match_id(scmi_dev, scmi_drv); if (!id) @@ -95,14 +79,6 @@ static int scmi_dev_probe(struct device *dev) if (!scmi_dev->handle) return -EPROBE_DEFER; - ret = scmi_protocol_init(scmi_dev->protocol_id, scmi_dev->handle); - if (ret) - return ret; - - /* Skip protocol initialisation for additional devices */ - idr_replace(&scmi_available_protocols, &scmi_protocol_dummy_init, - scmi_dev->protocol_id); - return scmi_drv->probe(scmi_dev); } diff --git a/drivers/firmware/arm_scmi/clock.c b/drivers/firmware/arm_scmi/clock.c index 4e8dafc36d7e..539c94860b8f 100644 --- a/drivers/firmware/arm_scmi/clock.c +++ b/drivers/firmware/arm_scmi/clock.c @@ -332,7 +332,7 @@ static const struct scmi_clk_ops clk_ops = { .disable = scmi_clock_disable, }; -static int scmi_clock_protocol_init(struct scmi_handle *handle) +static int scmi_clock_protocol_init(const struct scmi_handle *handle) { u32 version; int clkid, ret; @@ -363,8 +363,6 @@ static int scmi_clock_protocol_init(struct scmi_handle *handle) } cinfo->version = version; - handle->clk_ops = &clk_ops; - return scmi_set_proto_priv(handle, SCMI_PROTOCOL_CLOCK, cinfo); } diff --git a/drivers/firmware/arm_scmi/common.h b/drivers/firmware/arm_scmi/common.h index de2f22032a57..56ebb710ee84 100644 --- a/drivers/firmware/arm_scmi/common.h +++ b/drivers/firmware/arm_scmi/common.h @@ -158,7 +158,7 @@ int scmi_version_get(const struct scmi_handle *h, u8 protocol, u32 *version); void scmi_setup_protocol_implemented(const struct scmi_handle *handle, u8 *prot_imp); -typedef int (*scmi_prot_init_fn_t)(struct scmi_handle *); +typedef int (*scmi_prot_init_fn_t)(const struct scmi_handle *); /** * struct scmi_protocol - Protocol descriptor @@ -202,8 +202,8 @@ void __exit scmi_##name##_unregister(void) \ const struct scmi_protocol *scmi_get_protocol(int protocol_id); -int scmi_acquire_protocol(struct scmi_handle *handle, u8 protocol_id); -void scmi_release_protocol(struct scmi_handle *handle, u8 protocol_id); +int scmi_acquire_protocol(const struct scmi_handle *handle, u8 protocol_id); +void scmi_release_protocol(const struct scmi_handle *handle, u8 protocol_id); void *scmi_get_proto_priv(const struct scmi_handle *h, u8 prot); int scmi_set_proto_priv(const struct scmi_handle *handle, const u8 proto, 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; 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; };