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Commit 4a762739 authored by Shashank Mittal's avatar Shashank Mittal
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coresight-tmc: save TMC registers during abort 



TMC abort needs to save TMC registers so that TMC data can be extracted
from device crash dumps.

Change-Id: I4339e84dc62e589e0f4d341e8143b1cd94a9cbe2
Signed-off-by: default avatarShashank Mittal <mittals@codeaurora.org>
parent d2afad6a

drivers/hwtracing/coresight/coresight-tmc.c

+10 −2
Original line number Diff line number Diff line
@@ -95,6 +95,7 @@ 
#define TMC_ETR_BAM_PIPE_INDEX	0

#define TMC_ETR_BAM_NR_PIPES	2



#define TMC_ETFETB_DUMP_MAGIC_V2	(0x42445953)

#define TMC_REG_DUMP_MAGIC_V2		(0x42445953)

#define TMC_REG_DUMP_VER		(1)
@@ -178,6 +179,7 @@ struct tmc_drvdata { 
	spinlock_t		spinlock;

	int			read_count;

	bool			reading;

	bool			aborting;

	char			*buf;

	dma_addr_t		paddr;

	void __iomem		*vaddr;
@@ -883,11 +885,15 @@ static void tmc_etb_dump_hw(struct tmc_drvdata *drvdata) 
		for (i = 0; i < memwords; i++) {

			read_data = readl_relaxed(drvdata->base + TMC_RRD);

			if (read_data == 0xFFFFFFFF)

				return;

				goto out;

			memcpy(bufp, &read_data, 4);

			bufp += 4;

		}

	}



out:

	if (drvdata->aborting)

		drvdata->buf_data.magic = TMC_ETFETB_DUMP_MAGIC_V2;

}



static void tmc_etb_disable_hw(struct tmc_drvdata *drvdata)
@@ -1070,6 +1076,8 @@ static void tmc_abort(struct coresight_device *csdev) 
	unsigned long flags;

	enum tmc_mode mode;



	drvdata->aborting = true;



	spin_lock_irqsave(&drvdata->spinlock, flags);

	if (drvdata->reading)

		goto out0;
@@ -1728,7 +1736,7 @@ static void __tmc_reg_dump(struct tmc_drvdata *drvdata) 


	if (!drvdata->reg_buf)

		return;

	else if (!drvdata->dump_reg)

	else if (!drvdata->aborting && !drvdata->dump_reg)

		return;



	drvdata->reg_data.version = TMC_REG_DUMP_VER;