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authorJames Clark <james.clark@arm.com>2023-04-25 17:35:38 +0300
committerSuzuki K Poulose <suzuki.poulose@arm.com>2023-06-05 17:46:46 +0300
commit296b01fd106e787d4463974a7f42d286a5df08cd (patch)
treea8aee3618b4f18cf6a1c7676603d4d23ae57e21e /drivers/hwtracing
parentae7f2b5a7b569f8ede4af9e215515e5a0b824edd (diff)
downloadlinux-296b01fd106e787d4463974a7f42d286a5df08cd.tar.xz
coresight: Refactor out buffer allocation function for ETR
When CATU is moved to the generic enable/disable path system in the next commit, it will need to call into ETR and get it to pre-allocate its buffer so add a function for it. No functional changes Reviewed-by: Mike Leach <mike.leach@linaro.org> Signed-off-by: James Clark <james.clark@arm.com> Signed-off-by: Suzuki K Poulose <suzuki.poulose@arm.com> Link: https://lore.kernel.org/r/20230425143542.2305069-12-james.clark@arm.com
Diffstat (limited to 'drivers/hwtracing')
-rw-r--r--drivers/hwtracing/coresight/coresight-tmc-etr.c50
-rw-r--r--drivers/hwtracing/coresight/coresight-tmc.h2
2 files changed, 45 insertions, 7 deletions
diff --git a/drivers/hwtracing/coresight/coresight-tmc-etr.c b/drivers/hwtracing/coresight/coresight-tmc-etr.c
index 23fa70cc2098..7993398bdcce 100644
--- a/drivers/hwtracing/coresight/coresight-tmc-etr.c
+++ b/drivers/hwtracing/coresight/coresight-tmc-etr.c
@@ -1169,7 +1169,7 @@ void tmc_etr_disable_hw(struct tmc_drvdata *drvdata)
drvdata->etr_buf = NULL;
}
-static int tmc_enable_etr_sink_sysfs(struct coresight_device *csdev)
+static struct etr_buf *tmc_etr_get_sysfs_buffer(struct coresight_device *csdev)
{
int ret = 0;
unsigned long flags;
@@ -1192,7 +1192,7 @@ static int tmc_enable_etr_sink_sysfs(struct coresight_device *csdev)
/* Allocate memory with the locks released */
free_buf = new_buf = tmc_etr_setup_sysfs_buf(drvdata);
if (IS_ERR(new_buf))
- return PTR_ERR(new_buf);
+ return new_buf;
/* Let's try again */
spin_lock_irqsave(&drvdata->spinlock, flags);
@@ -1223,17 +1223,33 @@ static int tmc_enable_etr_sink_sysfs(struct coresight_device *csdev)
drvdata->sysfs_buf = new_buf;
}
- ret = tmc_etr_enable_hw(drvdata, drvdata->sysfs_buf);
- if (!ret) {
- drvdata->mode = CS_MODE_SYSFS;
- atomic_inc(&csdev->refcnt);
- }
out:
spin_unlock_irqrestore(&drvdata->spinlock, flags);
/* Free memory outside the spinlock if need be */
if (free_buf)
tmc_etr_free_sysfs_buf(free_buf);
+ return ret ? ERR_PTR(ret) : drvdata->sysfs_buf;
+}
+
+static int tmc_enable_etr_sink_sysfs(struct coresight_device *csdev)
+{
+ int ret;
+ unsigned long flags;
+ struct tmc_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
+ struct etr_buf *sysfs_buf = tmc_etr_get_sysfs_buffer(csdev);
+
+ if (IS_ERR(sysfs_buf))
+ return PTR_ERR(sysfs_buf);
+
+ spin_lock_irqsave(&drvdata->spinlock, flags);
+ ret = tmc_etr_enable_hw(drvdata, sysfs_buf);
+ if (!ret) {
+ drvdata->mode = CS_MODE_SYSFS;
+ atomic_inc(&csdev->refcnt);
+ }
+
+ spin_unlock_irqrestore(&drvdata->spinlock, flags);
if (!ret)
dev_dbg(&csdev->dev, "TMC-ETR enabled\n");
@@ -1241,6 +1257,26 @@ out:
return ret;
}
+struct etr_buf *tmc_etr_get_buffer(struct coresight_device *csdev,
+ enum cs_mode mode, void *data)
+{
+ struct perf_output_handle *handle = data;
+ struct etr_perf_buffer *etr_perf;
+
+ switch (mode) {
+ case CS_MODE_SYSFS:
+ return tmc_etr_get_sysfs_buffer(csdev);
+ case CS_MODE_PERF:
+ etr_perf = etm_perf_sink_config(handle);
+ if (WARN_ON(!etr_perf || !etr_perf->etr_buf))
+ return ERR_PTR(-EINVAL);
+ return etr_perf->etr_buf;
+ default:
+ return ERR_PTR(-EINVAL);
+ }
+}
+EXPORT_SYMBOL_GPL(tmc_etr_get_buffer);
+
/*
* alloc_etr_buf: Allocate ETR buffer for use by perf.
* The size of the hardware buffer is dependent on the size configured
diff --git a/drivers/hwtracing/coresight/coresight-tmc.h b/drivers/hwtracing/coresight/coresight-tmc.h
index 01c0382a29c0..b97da39652d2 100644
--- a/drivers/hwtracing/coresight/coresight-tmc.h
+++ b/drivers/hwtracing/coresight/coresight-tmc.h
@@ -332,5 +332,7 @@ struct coresight_device *tmc_etr_get_catu_device(struct tmc_drvdata *drvdata);
void tmc_etr_set_catu_ops(const struct etr_buf_operations *catu);
void tmc_etr_remove_catu_ops(void);
+struct etr_buf *tmc_etr_get_buffer(struct coresight_device *csdev,
+ enum cs_mode mode, void *data);
#endif