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Petersen" Cc: linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org, Bart Van Assche , Avri Altman Subject: [PATCH v3 2/2] scsi: ufs: core: Introduce a new clock_scaling lock Date: Tue, 5 Nov 2024 13:25:02 +0200 Message-Id: <20241105112502.710427-3-avri.altman@wdc.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20241105112502.710427-1-avri.altman@wdc.com> References: <20241105112502.710427-1-avri.altman@wdc.com> Precedence: bulk X-Mailing-List: linux-scsi@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Introduce a new clock scaling lock to serialize access to some of the clock scaling members instead of the host_lock. here also, simplify the code with the guard() macro and co. Reviewed-by: Bart Van Assche Signed-off-by: Avri Altman --- drivers/ufs/core/ufshcd.c | 126 +++++++++++++++++--------------------- include/ufs/ufshcd.h | 16 +++-- 2 files changed, 65 insertions(+), 77 deletions(-) diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c index 62c0e2323f50..fbc6e3f408af 100644 --- a/drivers/ufs/core/ufshcd.c +++ b/drivers/ufs/core/ufshcd.c @@ -1447,16 +1447,14 @@ static void ufshcd_clk_scaling_suspend_work(struct work_struct *work) { struct ufs_hba *hba = container_of(work, struct ufs_hba, clk_scaling.suspend_work); - unsigned long irq_flags; - spin_lock_irqsave(hba->host->host_lock, irq_flags); - if (hba->clk_scaling.active_reqs || hba->clk_scaling.is_suspended) { - spin_unlock_irqrestore(hba->host->host_lock, irq_flags); - return; + scoped_guard(spinlock_irqsave, &hba->clk_scaling.lock) { + if (hba->clk_scaling.active_reqs || hba->clk_scaling.is_suspended) + return; + + hba->clk_scaling.is_suspended = true; + hba->clk_scaling.window_start_t = 0; } - hba->clk_scaling.is_suspended = true; - hba->clk_scaling.window_start_t = 0; - spin_unlock_irqrestore(hba->host->host_lock, irq_flags); devfreq_suspend_device(hba->devfreq); } @@ -1465,15 +1463,12 @@ static void ufshcd_clk_scaling_resume_work(struct work_struct *work) { struct ufs_hba *hba = container_of(work, struct ufs_hba, clk_scaling.resume_work); - unsigned long irq_flags; - spin_lock_irqsave(hba->host->host_lock, irq_flags); - if (!hba->clk_scaling.is_suspended) { - spin_unlock_irqrestore(hba->host->host_lock, irq_flags); - return; + scoped_guard(spinlock_irqsave, &hba->clk_scaling.lock) { + if (!hba->clk_scaling.is_suspended) + return; + hba->clk_scaling.is_suspended = false; } - hba->clk_scaling.is_suspended = false; - spin_unlock_irqrestore(hba->host->host_lock, irq_flags); devfreq_resume_device(hba->devfreq); } @@ -1487,7 +1482,6 @@ static int ufshcd_devfreq_target(struct device *dev, bool scale_up = false, sched_clk_scaling_suspend_work = false; struct list_head *clk_list = &hba->clk_list_head; struct ufs_clk_info *clki; - unsigned long irq_flags; if (!ufshcd_is_clkscaling_supported(hba)) return -EINVAL; @@ -1508,43 +1502,37 @@ static int ufshcd_devfreq_target(struct device *dev, *freq = (unsigned long) clk_round_rate(clki->clk, *freq); } - spin_lock_irqsave(hba->host->host_lock, irq_flags); - if (ufshcd_eh_in_progress(hba)) { - spin_unlock_irqrestore(hba->host->host_lock, irq_flags); - return 0; - } + scoped_guard(spinlock_irqsave, &hba->clk_scaling.lock) { + if (ufshcd_eh_in_progress(hba)) + return 0; - /* Skip scaling clock when clock scaling is suspended */ - if (hba->clk_scaling.is_suspended) { - spin_unlock_irqrestore(hba->host->host_lock, irq_flags); - dev_warn(hba->dev, "clock scaling is suspended, skip"); - return 0; - } + /* Skip scaling clock when clock scaling is suspended */ + if (hba->clk_scaling.is_suspended) { + dev_warn(hba->dev, "clock scaling is suspended, skip"); + return 0; + } - if (!hba->clk_scaling.active_reqs) - sched_clk_scaling_suspend_work = true; + if (!hba->clk_scaling.active_reqs) + sched_clk_scaling_suspend_work = true; - if (list_empty(clk_list)) { - spin_unlock_irqrestore(hba->host->host_lock, irq_flags); - goto out; - } + if (list_empty(clk_list)) + goto out; - /* Decide based on the target or rounded-off frequency and update */ - if (hba->use_pm_opp) - scale_up = *freq > hba->clk_scaling.target_freq; - else - scale_up = *freq == clki->max_freq; + /* Decide based on the target or rounded-off frequency and update */ + if (hba->use_pm_opp) + scale_up = *freq > hba->clk_scaling.target_freq; + else + scale_up = *freq == clki->max_freq; - if (!hba->use_pm_opp && !scale_up) - *freq = clki->min_freq; + if (!hba->use_pm_opp && !scale_up) + *freq = clki->min_freq; - /* Update the frequency */ - if (!ufshcd_is_devfreq_scaling_required(hba, *freq, scale_up)) { - spin_unlock_irqrestore(hba->host->host_lock, irq_flags); - ret = 0; - goto out; /* no state change required */ + /* Update the frequency */ + if (!ufshcd_is_devfreq_scaling_required(hba, *freq, scale_up)) { + ret = 0; + goto out; /* no state change required */ + } } - spin_unlock_irqrestore(hba->host->host_lock, irq_flags); start = ktime_get(); ret = ufshcd_devfreq_scale(hba, *freq, scale_up); @@ -1569,7 +1557,6 @@ static int ufshcd_devfreq_get_dev_status(struct device *dev, { struct ufs_hba *hba = dev_get_drvdata(dev); struct ufs_clk_scaling *scaling = &hba->clk_scaling; - unsigned long flags; ktime_t curr_t; if (!ufshcd_is_clkscaling_supported(hba)) @@ -1577,7 +1564,8 @@ static int ufshcd_devfreq_get_dev_status(struct device *dev, memset(stat, 0, sizeof(*stat)); - spin_lock_irqsave(hba->host->host_lock, flags); + guard(spinlock_irqsave)(&hba->clk_scaling.lock); + curr_t = ktime_get(); if (!scaling->window_start_t) goto start_window; @@ -1613,7 +1601,7 @@ static int ufshcd_devfreq_get_dev_status(struct device *dev, scaling->busy_start_t = 0; scaling->is_busy_started = false; } - spin_unlock_irqrestore(hba->host->host_lock, flags); + return 0; } @@ -1677,19 +1665,18 @@ static void ufshcd_devfreq_remove(struct ufs_hba *hba) static void ufshcd_suspend_clkscaling(struct ufs_hba *hba) { - unsigned long flags; bool suspend = false; cancel_work_sync(&hba->clk_scaling.suspend_work); cancel_work_sync(&hba->clk_scaling.resume_work); - spin_lock_irqsave(hba->host->host_lock, flags); - if (!hba->clk_scaling.is_suspended) { - suspend = true; - hba->clk_scaling.is_suspended = true; - hba->clk_scaling.window_start_t = 0; + scoped_guard(spinlock_irqsave, &hba->clk_scaling.lock) { + if (!hba->clk_scaling.is_suspended) { + suspend = true; + hba->clk_scaling.is_suspended = true; + hba->clk_scaling.window_start_t = 0; + } } - spin_unlock_irqrestore(hba->host->host_lock, flags); if (suspend) devfreq_suspend_device(hba->devfreq); @@ -1697,15 +1684,14 @@ static void ufshcd_suspend_clkscaling(struct ufs_hba *hba) static void ufshcd_resume_clkscaling(struct ufs_hba *hba) { - unsigned long flags; bool resume = false; - spin_lock_irqsave(hba->host->host_lock, flags); - if (hba->clk_scaling.is_suspended) { - resume = true; - hba->clk_scaling.is_suspended = false; + scoped_guard(spinlock_irqsave, &hba->clk_scaling.lock) { + if (hba->clk_scaling.is_suspended) { + resume = true; + hba->clk_scaling.is_suspended = false; + } } - spin_unlock_irqrestore(hba->host->host_lock, flags); if (resume) devfreq_resume_device(hba->devfreq); @@ -1791,6 +1777,8 @@ static void ufshcd_init_clk_scaling(struct ufs_hba *hba) INIT_WORK(&hba->clk_scaling.resume_work, ufshcd_clk_scaling_resume_work); + spin_lock_init(&hba->clk_scaling.lock); + hba->clk_scaling.workq = alloc_ordered_workqueue( "ufs_clkscaling_%d", WQ_MEM_RECLAIM, hba->host->host_no); @@ -2143,19 +2131,17 @@ static void ufshcd_clk_scaling_start_busy(struct ufs_hba *hba) { bool queue_resume_work = false; ktime_t curr_t = ktime_get(); - unsigned long flags; if (!ufshcd_is_clkscaling_supported(hba)) return; - spin_lock_irqsave(hba->host->host_lock, flags); + guard(spinlock_irqsave)(&hba->clk_scaling.lock); + if (!hba->clk_scaling.active_reqs++) queue_resume_work = true; - if (!hba->clk_scaling.is_enabled || hba->pm_op_in_progress) { - spin_unlock_irqrestore(hba->host->host_lock, flags); + if (!hba->clk_scaling.is_enabled || hba->pm_op_in_progress) return; - } if (queue_resume_work) queue_work(hba->clk_scaling.workq, @@ -2171,18 +2157,17 @@ static void ufshcd_clk_scaling_start_busy(struct ufs_hba *hba) hba->clk_scaling.busy_start_t = curr_t; hba->clk_scaling.is_busy_started = true; } - spin_unlock_irqrestore(hba->host->host_lock, flags); } static void ufshcd_clk_scaling_update_busy(struct ufs_hba *hba) { struct ufs_clk_scaling *scaling = &hba->clk_scaling; - unsigned long flags; if (!ufshcd_is_clkscaling_supported(hba)) return; - spin_lock_irqsave(hba->host->host_lock, flags); + guard(spinlock_irqsave)(&hba->clk_scaling.lock); + hba->clk_scaling.active_reqs--; if (!scaling->active_reqs && scaling->is_busy_started) { scaling->tot_busy_t += ktime_to_us(ktime_sub(ktime_get(), @@ -2190,7 +2175,6 @@ static void ufshcd_clk_scaling_update_busy(struct ufs_hba *hba) scaling->busy_start_t = 0; scaling->is_busy_started = false; } - spin_unlock_irqrestore(hba->host->host_lock, flags); } static inline int ufshcd_monitor_opcode2dir(u8 opcode) diff --git a/include/ufs/ufshcd.h b/include/ufs/ufshcd.h index 8f9997b0dbf9..c449b6cdc1dc 100644 --- a/include/ufs/ufshcd.h +++ b/include/ufs/ufshcd.h @@ -435,6 +435,10 @@ struct ufs_clk_gating { /** * struct ufs_clk_scaling - UFS clock scaling related data + * @workq: workqueue to schedule devfreq suspend/resume work + * @suspend_work: worker to suspend devfreq + * @resume_work: worker to resume devfreq + * @lock: serialize access to some struct ufs_clk_scaling members * @active_reqs: number of requests that are pending. If this is zero when * devfreq ->target() function is called then schedule "suspend_work" to * suspend devfreq. @@ -444,9 +448,6 @@ struct ufs_clk_gating { * @enable_attr: sysfs attribute to enable/disable clock scaling * @saved_pwr_info: UFS power mode may also be changed during scaling and this * one keeps track of previous power mode. - * @workq: workqueue to schedule devfreq suspend/resume work - * @suspend_work: worker to suspend devfreq - * @resume_work: worker to resume devfreq * @target_freq: frequency requested by devfreq framework * @min_gear: lowest HS gear to scale down to * @is_enabled: tracks if scaling is currently enabled or not, controlled by @@ -458,15 +459,18 @@ struct ufs_clk_gating { * @is_suspended: tracks if devfreq is suspended or not */ struct ufs_clk_scaling { + struct workqueue_struct *workq; + struct work_struct suspend_work; + struct work_struct resume_work; + + spinlock_t lock; + int active_reqs; unsigned long tot_busy_t; ktime_t window_start_t; ktime_t busy_start_t; struct device_attribute enable_attr; struct ufs_pa_layer_attr saved_pwr_info; - struct workqueue_struct *workq; - struct work_struct suspend_work; - struct work_struct resume_work; unsigned long target_freq; u32 min_gear; bool is_enabled;