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coresight-tmc: change tmc_drvdata spinlock's type to raw_spinlock_t
In coresight-tmc drivers, tmc_drvdata->spinlock can be held during __schedule() by perf_event_task_sched_out()/in(). Since tmc_drvdata->spinlock type is spinlock_t and perf_event_task_sched_out()/in() is called after acquiring rq_lock, which is raw_spinlock_t (an unsleepable lock), this poses an issue in PREEMPT_RT kernel where spinlock_t is sleepable. To address this, change type tmc_drvdata->spinlock in coresight-tmc drivers, which can be called by perf_event_task_sched_out()/in(), from spinlock_t to raw_spinlock_t. Reviewed-by: James Clark <james.clark@linaro.org> Reviewed-by: Mike Leach <mike.leach@linaro.org> Signed-off-by: Yeoreum Yun <yeoreum.yun@arm.com> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com> Link: https://lore.kernel.org/r/20250306121110.1647948-9-yeoreum.yun@arm.com
This commit is contained in:
Yeoreum Yun
Suzuki K Poulose
parent
982d0a0e08
commit
db11f75bc2
4 changed files with 54 additions and 54 deletions
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@ -358,12 +358,12 @@ static int tmc_crashdata_open(struct inode *inode, struct file *file)
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mdata = drvdata->crash_mdata.vaddr;
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rbuf = &drvdata->resrv_buf;
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spin_lock_irqsave(&drvdata->spinlock, flags);
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raw_spin_lock_irqsave(&drvdata->spinlock, flags);
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if (mdata->valid)
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rbuf->reading = true;
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else
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err = -ENOENT;
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spin_unlock_irqrestore(&drvdata->spinlock, flags);
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raw_spin_unlock_irqrestore(&drvdata->spinlock, flags);
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if (err)
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goto exit;
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@ -408,9 +408,9 @@ static int tmc_crashdata_release(struct inode *inode, struct file *file)
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crashdev);
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rbuf = &drvdata->resrv_buf;
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spin_lock_irqsave(&drvdata->spinlock, flags);
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raw_spin_lock_irqsave(&drvdata->spinlock, flags);
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rbuf->reading = false;
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spin_unlock_irqrestore(&drvdata->spinlock, flags);
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raw_spin_unlock_irqrestore(&drvdata->spinlock, flags);
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dev_dbg(&drvdata->csdev->dev, "%s: released\n", __func__);
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return ret;
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@ -801,7 +801,7 @@ static int __tmc_probe(struct device *dev, struct resource *res)
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drvdata->base = base;
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desc.access = CSDEV_ACCESS_IOMEM(base);
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spin_lock_init(&drvdata->spinlock);
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raw_spin_lock_init(&drvdata->spinlock);
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devid = readl_relaxed(drvdata->base + CORESIGHT_DEVID);
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drvdata->config_type = BMVAL(devid, 6, 7);
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@ -913,7 +913,7 @@ static void tmc_shutdown(struct amba_device *adev)
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unsigned long flags;
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struct tmc_drvdata *drvdata = amba_get_drvdata(adev);
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spin_lock_irqsave(&drvdata->spinlock, flags);
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raw_spin_lock_irqsave(&drvdata->spinlock, flags);
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if (coresight_get_mode(drvdata->csdev) == CS_MODE_DISABLED)
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goto out;
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@ -927,7 +927,7 @@ static void tmc_shutdown(struct amba_device *adev)
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* the system is going down after this.
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*/
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out:
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spin_unlock_irqrestore(&drvdata->spinlock, flags);
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raw_spin_unlock_irqrestore(&drvdata->spinlock, flags);
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}
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static void __tmc_remove(struct device *dev)
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@ -185,9 +185,9 @@ static int tmc_enable_etf_sink_sysfs(struct coresight_device *csdev)
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* If we don't have a buffer release the lock and allocate memory.
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* Otherwise keep the lock and move along.
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*/
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spin_lock_irqsave(&drvdata->spinlock, flags);
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raw_spin_lock_irqsave(&drvdata->spinlock, flags);
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if (!drvdata->buf) {
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spin_unlock_irqrestore(&drvdata->spinlock, flags);
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raw_spin_unlock_irqrestore(&drvdata->spinlock, flags);
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/* Allocating the memory here while outside of the spinlock */
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buf = kzalloc(drvdata->size, GFP_KERNEL);
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@ -195,7 +195,7 @@ static int tmc_enable_etf_sink_sysfs(struct coresight_device *csdev)
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return -ENOMEM;
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/* Let's try again */
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spin_lock_irqsave(&drvdata->spinlock, flags);
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raw_spin_lock_irqsave(&drvdata->spinlock, flags);
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}
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if (drvdata->reading) {
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@ -237,7 +237,7 @@ static int tmc_enable_etf_sink_sysfs(struct coresight_device *csdev)
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used = false;
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}
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out:
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spin_unlock_irqrestore(&drvdata->spinlock, flags);
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raw_spin_unlock_irqrestore(&drvdata->spinlock, flags);
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/* Free memory outside the spinlock if need be */
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if (!used)
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@ -255,7 +255,7 @@ static int tmc_enable_etf_sink_perf(struct coresight_device *csdev, void *data)
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struct perf_output_handle *handle = data;
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struct cs_buffers *buf = etm_perf_sink_config(handle);
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spin_lock_irqsave(&drvdata->spinlock, flags);
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raw_spin_lock_irqsave(&drvdata->spinlock, flags);
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do {
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ret = -EINVAL;
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if (drvdata->reading)
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@ -298,7 +298,7 @@ static int tmc_enable_etf_sink_perf(struct coresight_device *csdev, void *data)
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csdev->refcnt++;
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}
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} while (0);
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spin_unlock_irqrestore(&drvdata->spinlock, flags);
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raw_spin_unlock_irqrestore(&drvdata->spinlock, flags);
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return ret;
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}
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@ -333,16 +333,16 @@ static int tmc_disable_etf_sink(struct coresight_device *csdev)
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unsigned long flags;
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struct tmc_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
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spin_lock_irqsave(&drvdata->spinlock, flags);
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raw_spin_lock_irqsave(&drvdata->spinlock, flags);
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if (drvdata->reading) {
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spin_unlock_irqrestore(&drvdata->spinlock, flags);
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raw_spin_unlock_irqrestore(&drvdata->spinlock, flags);
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return -EBUSY;
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}
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csdev->refcnt--;
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if (csdev->refcnt) {
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spin_unlock_irqrestore(&drvdata->spinlock, flags);
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raw_spin_unlock_irqrestore(&drvdata->spinlock, flags);
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return -EBUSY;
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}
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@ -353,7 +353,7 @@ static int tmc_disable_etf_sink(struct coresight_device *csdev)
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drvdata->pid = -1;
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coresight_set_mode(csdev, CS_MODE_DISABLED);
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spin_unlock_irqrestore(&drvdata->spinlock, flags);
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raw_spin_unlock_irqrestore(&drvdata->spinlock, flags);
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dev_dbg(&csdev->dev, "TMC-ETB/ETF disabled\n");
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return 0;
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@ -368,9 +368,9 @@ static int tmc_enable_etf_link(struct coresight_device *csdev,
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struct tmc_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
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bool first_enable = false;
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spin_lock_irqsave(&drvdata->spinlock, flags);
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raw_spin_lock_irqsave(&drvdata->spinlock, flags);
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if (drvdata->reading) {
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spin_unlock_irqrestore(&drvdata->spinlock, flags);
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raw_spin_unlock_irqrestore(&drvdata->spinlock, flags);
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return -EBUSY;
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}
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@ -383,7 +383,7 @@ static int tmc_enable_etf_link(struct coresight_device *csdev,
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}
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if (!ret)
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csdev->refcnt++;
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spin_unlock_irqrestore(&drvdata->spinlock, flags);
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raw_spin_unlock_irqrestore(&drvdata->spinlock, flags);
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if (first_enable)
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dev_dbg(&csdev->dev, "TMC-ETF enabled\n");
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@ -398,9 +398,9 @@ static void tmc_disable_etf_link(struct coresight_device *csdev,
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struct tmc_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
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bool last_disable = false;
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spin_lock_irqsave(&drvdata->spinlock, flags);
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raw_spin_lock_irqsave(&drvdata->spinlock, flags);
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if (drvdata->reading) {
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spin_unlock_irqrestore(&drvdata->spinlock, flags);
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raw_spin_unlock_irqrestore(&drvdata->spinlock, flags);
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return;
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}
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@ -410,7 +410,7 @@ static void tmc_disable_etf_link(struct coresight_device *csdev,
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coresight_set_mode(csdev, CS_MODE_DISABLED);
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last_disable = true;
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}
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spin_unlock_irqrestore(&drvdata->spinlock, flags);
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raw_spin_unlock_irqrestore(&drvdata->spinlock, flags);
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if (last_disable)
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dev_dbg(&csdev->dev, "TMC-ETF disabled\n");
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@ -490,7 +490,7 @@ static unsigned long tmc_update_etf_buffer(struct coresight_device *csdev,
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if (WARN_ON_ONCE(coresight_get_mode(csdev) != CS_MODE_PERF))
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return 0;
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spin_lock_irqsave(&drvdata->spinlock, flags);
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raw_spin_lock_irqsave(&drvdata->spinlock, flags);
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/* Don't do anything if another tracer is using this sink */
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if (csdev->refcnt != 1)
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@ -587,7 +587,7 @@ static unsigned long tmc_update_etf_buffer(struct coresight_device *csdev,
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*/
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CS_LOCK(drvdata->base);
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out:
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spin_unlock_irqrestore(&drvdata->spinlock, flags);
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raw_spin_unlock_irqrestore(&drvdata->spinlock, flags);
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return to_read;
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}
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@ -705,7 +705,7 @@ int tmc_read_prepare_etb(struct tmc_drvdata *drvdata)
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drvdata->config_type != TMC_CONFIG_TYPE_ETF))
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return -EINVAL;
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spin_lock_irqsave(&drvdata->spinlock, flags);
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raw_spin_lock_irqsave(&drvdata->spinlock, flags);
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if (drvdata->reading) {
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ret = -EBUSY;
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@ -737,7 +737,7 @@ int tmc_read_prepare_etb(struct tmc_drvdata *drvdata)
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drvdata->reading = true;
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out:
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spin_unlock_irqrestore(&drvdata->spinlock, flags);
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raw_spin_unlock_irqrestore(&drvdata->spinlock, flags);
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return ret;
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}
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@ -754,14 +754,14 @@ int tmc_read_unprepare_etb(struct tmc_drvdata *drvdata)
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drvdata->config_type != TMC_CONFIG_TYPE_ETF))
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return -EINVAL;
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spin_lock_irqsave(&drvdata->spinlock, flags);
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raw_spin_lock_irqsave(&drvdata->spinlock, flags);
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/* Re-enable the TMC if need be */
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if (coresight_get_mode(drvdata->csdev) == CS_MODE_SYSFS) {
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/* There is no point in reading a TMC in HW FIFO mode */
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mode = readl_relaxed(drvdata->base + TMC_MODE);
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if (mode != TMC_MODE_CIRCULAR_BUFFER) {
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spin_unlock_irqrestore(&drvdata->spinlock, flags);
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raw_spin_unlock_irqrestore(&drvdata->spinlock, flags);
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return -EINVAL;
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}
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/*
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@ -775,7 +775,7 @@ int tmc_read_unprepare_etb(struct tmc_drvdata *drvdata)
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memset(drvdata->buf, 0, drvdata->size);
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rc = __tmc_etb_enable_hw(drvdata);
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if (rc) {
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spin_unlock_irqrestore(&drvdata->spinlock, flags);
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raw_spin_unlock_irqrestore(&drvdata->spinlock, flags);
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return rc;
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}
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} else {
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@ -788,7 +788,7 @@ int tmc_read_unprepare_etb(struct tmc_drvdata *drvdata)
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}
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drvdata->reading = false;
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spin_unlock_irqrestore(&drvdata->spinlock, flags);
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raw_spin_unlock_irqrestore(&drvdata->spinlock, flags);
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/*
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* Free allocated memory outside of the spinlock. There is no need
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@ -1251,10 +1251,10 @@ static struct etr_buf *tmc_etr_get_sysfs_buffer(struct coresight_device *csdev)
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* buffer, provided the size matches. Any allocation has to be done
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* with the lock released.
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*/
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spin_lock_irqsave(&drvdata->spinlock, flags);
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raw_spin_lock_irqsave(&drvdata->spinlock, flags);
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sysfs_buf = READ_ONCE(drvdata->sysfs_buf);
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if (!sysfs_buf || (sysfs_buf->size != drvdata->size)) {
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spin_unlock_irqrestore(&drvdata->spinlock, flags);
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raw_spin_unlock_irqrestore(&drvdata->spinlock, flags);
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/* Allocate memory with the locks released */
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free_buf = new_buf = tmc_etr_setup_sysfs_buf(drvdata);
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@ -1262,7 +1262,7 @@ static struct etr_buf *tmc_etr_get_sysfs_buffer(struct coresight_device *csdev)
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return new_buf;
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/* Let's try again */
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spin_lock_irqsave(&drvdata->spinlock, flags);
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raw_spin_lock_irqsave(&drvdata->spinlock, flags);
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}
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if (drvdata->reading || coresight_get_mode(csdev) == CS_MODE_PERF) {
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@ -1281,7 +1281,7 @@ static struct etr_buf *tmc_etr_get_sysfs_buffer(struct coresight_device *csdev)
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}
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out:
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spin_unlock_irqrestore(&drvdata->spinlock, flags);
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raw_spin_unlock_irqrestore(&drvdata->spinlock, flags);
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/* Free memory outside the spinlock if need be */
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if (free_buf)
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@ -1299,7 +1299,7 @@ static int tmc_enable_etr_sink_sysfs(struct coresight_device *csdev)
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if (IS_ERR(sysfs_buf))
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return PTR_ERR(sysfs_buf);
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spin_lock_irqsave(&drvdata->spinlock, flags);
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raw_spin_lock_irqsave(&drvdata->spinlock, flags);
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/*
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* In sysFS mode we can have multiple writers per sink. Since this
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@ -1318,7 +1318,7 @@ static int tmc_enable_etr_sink_sysfs(struct coresight_device *csdev)
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}
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out:
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spin_unlock_irqrestore(&drvdata->spinlock, flags);
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raw_spin_unlock_irqrestore(&drvdata->spinlock, flags);
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if (!ret)
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dev_dbg(&csdev->dev, "TMC-ETR enabled\n");
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@ -1637,17 +1637,17 @@ tmc_update_etr_buffer(struct coresight_device *csdev,
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struct etr_perf_buffer *etr_perf = config;
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struct etr_buf *etr_buf = etr_perf->etr_buf;
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spin_lock_irqsave(&drvdata->spinlock, flags);
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raw_spin_lock_irqsave(&drvdata->spinlock, flags);
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/* Don't do anything if another tracer is using this sink */
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if (csdev->refcnt != 1) {
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spin_unlock_irqrestore(&drvdata->spinlock, flags);
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raw_spin_unlock_irqrestore(&drvdata->spinlock, flags);
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goto out;
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}
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if (WARN_ON(drvdata->perf_buf != etr_buf)) {
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lost = true;
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spin_unlock_irqrestore(&drvdata->spinlock, flags);
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raw_spin_unlock_irqrestore(&drvdata->spinlock, flags);
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goto out;
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}
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@ -1657,7 +1657,7 @@ tmc_update_etr_buffer(struct coresight_device *csdev,
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tmc_sync_etr_buf(drvdata);
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CS_LOCK(drvdata->base);
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spin_unlock_irqrestore(&drvdata->spinlock, flags);
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raw_spin_unlock_irqrestore(&drvdata->spinlock, flags);
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lost = etr_buf->full;
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offset = etr_buf->offset;
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@ -1726,7 +1726,7 @@ static int tmc_enable_etr_sink_perf(struct coresight_device *csdev, void *data)
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struct perf_output_handle *handle = data;
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struct etr_perf_buffer *etr_perf = etm_perf_sink_config(handle);
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spin_lock_irqsave(&drvdata->spinlock, flags);
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raw_spin_lock_irqsave(&drvdata->spinlock, flags);
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/* Don't use this sink if it is already claimed by sysFS */
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if (coresight_get_mode(csdev) == CS_MODE_SYSFS) {
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rc = -EBUSY;
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@ -1766,7 +1766,7 @@ static int tmc_enable_etr_sink_perf(struct coresight_device *csdev, void *data)
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}
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unlock_out:
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spin_unlock_irqrestore(&drvdata->spinlock, flags);
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raw_spin_unlock_irqrestore(&drvdata->spinlock, flags);
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return rc;
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}
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@ -1788,16 +1788,16 @@ static int tmc_disable_etr_sink(struct coresight_device *csdev)
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unsigned long flags;
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struct tmc_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
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spin_lock_irqsave(&drvdata->spinlock, flags);
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raw_spin_lock_irqsave(&drvdata->spinlock, flags);
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if (drvdata->reading) {
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spin_unlock_irqrestore(&drvdata->spinlock, flags);
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raw_spin_unlock_irqrestore(&drvdata->spinlock, flags);
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return -EBUSY;
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}
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csdev->refcnt--;
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if (csdev->refcnt) {
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spin_unlock_irqrestore(&drvdata->spinlock, flags);
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raw_spin_unlock_irqrestore(&drvdata->spinlock, flags);
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return -EBUSY;
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}
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@ -1810,7 +1810,7 @@ static int tmc_disable_etr_sink(struct coresight_device *csdev)
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/* Reset perf specific data */
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drvdata->perf_buf = NULL;
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spin_unlock_irqrestore(&drvdata->spinlock, flags);
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raw_spin_unlock_irqrestore(&drvdata->spinlock, flags);
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dev_dbg(&csdev->dev, "TMC-ETR disabled\n");
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return 0;
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@ -1910,7 +1910,7 @@ int tmc_read_prepare_etr(struct tmc_drvdata *drvdata)
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if (WARN_ON_ONCE(drvdata->config_type != TMC_CONFIG_TYPE_ETR))
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return -EINVAL;
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spin_lock_irqsave(&drvdata->spinlock, flags);
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raw_spin_lock_irqsave(&drvdata->spinlock, flags);
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if (drvdata->reading) {
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ret = -EBUSY;
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goto out;
|
||||
|
|
@ -1932,7 +1932,7 @@ int tmc_read_prepare_etr(struct tmc_drvdata *drvdata)
|
|||
|
||||
drvdata->reading = true;
|
||||
out:
|
||||
spin_unlock_irqrestore(&drvdata->spinlock, flags);
|
||||
raw_spin_unlock_irqrestore(&drvdata->spinlock, flags);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
|
@ -1946,7 +1946,7 @@ int tmc_read_unprepare_etr(struct tmc_drvdata *drvdata)
|
|||
if (WARN_ON_ONCE(drvdata->config_type != TMC_CONFIG_TYPE_ETR))
|
||||
return -EINVAL;
|
||||
|
||||
spin_lock_irqsave(&drvdata->spinlock, flags);
|
||||
raw_spin_lock_irqsave(&drvdata->spinlock, flags);
|
||||
|
||||
/* RE-enable the TMC if need be */
|
||||
if (coresight_get_mode(drvdata->csdev) == CS_MODE_SYSFS) {
|
||||
|
|
@ -1966,7 +1966,7 @@ int tmc_read_unprepare_etr(struct tmc_drvdata *drvdata)
|
|||
}
|
||||
|
||||
drvdata->reading = false;
|
||||
spin_unlock_irqrestore(&drvdata->spinlock, flags);
|
||||
raw_spin_unlock_irqrestore(&drvdata->spinlock, flags);
|
||||
|
||||
/* Free allocated memory out side of the spinlock */
|
||||
if (sysfs_buf)
|
||||
|
|
@ -2023,14 +2023,14 @@ static int buf_mode_set_resrv(struct tmc_drvdata *drvdata)
|
|||
rbuf = &drvdata->resrv_buf;
|
||||
|
||||
/* Ensure there are no active crashdata read sessions */
|
||||
spin_lock_irqsave(&drvdata->spinlock, flags);
|
||||
raw_spin_lock_irqsave(&drvdata->spinlock, flags);
|
||||
if (!rbuf->reading) {
|
||||
tmc_crashdata_set_invalid(drvdata);
|
||||
rbuf->len = 0;
|
||||
drvdata->etr_mode = ETR_MODE_RESRV;
|
||||
err = 0;
|
||||
}
|
||||
spin_unlock_irqrestore(&drvdata->spinlock, flags);
|
||||
raw_spin_unlock_irqrestore(&drvdata->spinlock, flags);
|
||||
return err;
|
||||
}
|
||||
|
||||
|
|
|
|||
|
|
@ -249,7 +249,7 @@ struct tmc_drvdata {
|
|||
struct coresight_device *csdev;
|
||||
struct miscdevice miscdev;
|
||||
struct miscdevice crashdev;
|
||||
spinlock_t spinlock;
|
||||
raw_spinlock_t spinlock;
|
||||
pid_t pid;
|
||||
bool reading;
|
||||
bool stop_on_flush;
|
||||
|
|
|
|||
Loading…
Reference in a new issue