linux-kernel - [PATCH v2 22/27] coresight: tmc-etr: Track if the device is coherent

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Date:   Tue,  1 May 2018 10:10:52 +0100
From:   Suzuki K Poulose <suzuki.poulose@....com>
To:     linux-arm-kernel@...ts.infradead.org
Cc:     linux-kernel@...r.kernel.org, mathieu.poirier@...aro.org,
        mike.leach@...aro.org, robert.walker@....com, mark.rutland@....com,
        will.deacon@....com, robin.murphy@....com, sudeep.holla@....com,
        frowand.list@...il.com, robh@...nel.org, john.horley@....com,
        Suzuki K Poulose <suzuki.poulose@....com>
Subject: [PATCH v2 22/27] coresight: tmc-etr: Track if the device is coherent

Track if the ETR is dma-coherent or not. This will be useful
in deciding if we should use software buffering for perf.

Cc: Mathieu Poirier <mathieu.poirier@...aro.org>
Signed-off-by: Suzuki K Poulose <suzuki.poulose@....com>
---
 drivers/hwtracing/coresight/coresight-tmc.c | 3 +++
 drivers/hwtracing/coresight/coresight-tmc.h | 1 +
 2 files changed, 4 insertions(+)

diff --git a/drivers/hwtracing/coresight/coresight-tmc.c b/drivers/hwtracing/coresight/coresight-tmc.c
index 7adcde3..91a8f7b 100644
--- a/drivers/hwtracing/coresight/coresight-tmc.c
+++ b/drivers/hwtracing/coresight/coresight-tmc.c
@@ -359,6 +359,9 @@ static int tmc_etr_setup_caps(struct tmc_drvdata *drvdata,
 	if (!(devid & TMC_DEVID_NOSCAT) && tmc_etr_can_use_sg(drvdata))
 		tmc_etr_set_cap(drvdata, TMC_ETR_SG);
 
+	if (device_get_dma_attr(drvdata->dev) == DEV_DMA_COHERENT)
+		tmc_etr_set_cap(drvdata, TMC_ETR_COHERENT);
+
 	/* Check if the AXI address width is available */
 	if (devid & TMC_DEVID_AXIAW_VALID)
 		dma_mask = ((devid >> TMC_DEVID_AXIAW_SHIFT) &
diff --git a/drivers/hwtracing/coresight/coresight-tmc.h b/drivers/hwtracing/coresight/coresight-tmc.h
index 1f6aa49..76a89a6 100644
--- a/drivers/hwtracing/coresight/coresight-tmc.h
+++ b/drivers/hwtracing/coresight/coresight-tmc.h
@@ -131,6 +131,7 @@ enum tmc_mem_intf_width {
  * so we have to rely on PID of the IP to detect the functionality.
  */
 #define TMC_ETR_SAVE_RESTORE		(0x1U << 2)
+#define TMC_ETR_COHERENT		(0x1U << 3)
 
 /* Coresight SoC-600 TMC-ETR unadvertised capabilities */
 #define CORESIGHT_SOC_600_ETR_CAPS	\
-- 
2.7.4