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UPSTREAM: coresight: etb10: Add support for CLAIM tag

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(Upstream commit acaf5a06b9).

Following in the footstep of what was done for other CoreSight devices,
add CLAIM tag support to ETB10 in order to synchronise access to the
HW between the kernel and an external agent.

Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@arm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Bug: 140266694
Change-Id: I35e83a66af545abbc7ea5fa303c2086f687a1f76
Signed-off-by: Yabin Cui <yabinc@google.com>
This commit is contained in:
Mathieu Poirier
2018-11-30 11:43:03 -07:00
committed by Yabin Cui
parent cbb64784c0
commit 3075152770
1 changed files with 17 additions and 6 deletions
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23
drivers/hwtracing/coresight/coresight-etb10.c
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@@ -136,6 +136,11 @@ static void __etb_enable_hw(struct etb_drvdata *drvdata)
static int etb_enable_hw(struct etb_drvdata *drvdata)
{
int rc = coresight_claim_device(drvdata->base);
if (rc)
return rc;
__etb_enable_hw(drvdata);
return 0;
}
@@ -223,7 +228,7 @@ static int etb_enable(struct coresight_device *csdev, u32 mode, void *data)
return 0;
}
static void etb_disable_hw(struct etb_drvdata *drvdata)
static void __etb_disable_hw(struct etb_drvdata *drvdata)
{
u32 ffcr;
@@ -313,6 +318,13 @@ static void etb_dump_hw(struct etb_drvdata *drvdata)
CS_LOCK(drvdata->base);
}
static void etb_disable_hw(struct etb_drvdata *drvdata)
{
__etb_disable_hw(drvdata);
etb_dump_hw(drvdata);
coresight_disclaim_device(drvdata->base);
}
static void etb_disable(struct coresight_device *csdev)
{
struct etb_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
@@ -323,7 +335,6 @@ static void etb_disable(struct coresight_device *csdev)
/* Disable the ETB only if it needs to */
if (drvdata->mode != CS_MODE_DISABLED) {
etb_disable_hw(drvdata);
etb_dump_hw(drvdata);
drvdata->mode = CS_MODE_DISABLED;
}
spin_unlock_irqrestore(&drvdata->spinlock, flags);
@@ -402,7 +413,7 @@ static unsigned long etb_update_buffer(struct coresight_device *csdev,
capacity = drvdata->buffer_depth * ETB_FRAME_SIZE_WORDS;
etb_disable_hw(drvdata);
__etb_disable_hw(drvdata);
CS_UNLOCK(drvdata->base);
/* unit is in words, not bytes */
@@ -510,7 +521,7 @@ static unsigned long etb_update_buffer(struct coresight_device *csdev,
handle->head = (cur * PAGE_SIZE) + offset;
to_read = buf->nr_pages << PAGE_SHIFT;
}
etb_enable_hw(drvdata);
__etb_enable_hw(drvdata);
CS_LOCK(drvdata->base);
return to_read;
@@ -534,9 +545,9 @@ static void etb_dump(struct etb_drvdata *drvdata)
spin_lock_irqsave(&drvdata->spinlock, flags);
if (drvdata->mode == CS_MODE_SYSFS) {
etb_disable_hw(drvdata);
__etb_disable_hw(drvdata);
etb_dump_hw(drvdata);
etb_enable_hw(drvdata);
__etb_enable_hw(drvdata);
}
spin_unlock_irqrestore(&drvdata->spinlock, flags);