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Message-ID: <20230904050548.28047-5-lcherian@marvell.com>
Date: Mon, 4 Sep 2023 10:35:44 +0530
From: Linu Cherian <lcherian@...vell.com>
To: <suzuki.poulose@....com>, <mike.leach@...aro.org>,
<james.clark@....com>, <leo.yan@...aro.org>
CC: <linux-arm-kernel@...ts.infradead.org>,
<coresight@...ts.linaro.org>, <linux-kernel@...r.kernel.org>,
<robh+dt@...nel.org>, <krzysztof.kozlowski+dt@...aro.org>,
<conor+dt@...nel.org>, <devicetree@...r.kernel.org>,
<sgoutham@...vell.com>, <gcherian@...vell.com>,
Linu Cherian <lcherian@...vell.com>
Subject: [RFC PATCH v3 4/7] coresight: tmc: Enable panic sync handling
- Get reserved region from device tree node for metadata
- Define metadata format for TMC
- Add TMC ETR panic sync handler that syncs register snapshot
to metadata region
- Add TMC ETF panic sync handler that syncs register snapshot
to metadata region and internal SRAM to reserved trace buffer
region.
Signed-off-by: Linu Cherian <lcherian@...vell.com>
---
.../hwtracing/coresight/coresight-tmc-core.c | 26 +++++++++
.../hwtracing/coresight/coresight-tmc-etf.c | 56 +++++++++++++++++++
.../hwtracing/coresight/coresight-tmc-etr.c | 52 +++++++++++++++++
drivers/hwtracing/coresight/coresight-tmc.h | 19 ++++++-
4 files changed, 152 insertions(+), 1 deletion(-)
diff --git a/drivers/hwtracing/coresight/coresight-tmc-core.c b/drivers/hwtracing/coresight/coresight-tmc-core.c
index c37dc629408b..d69da50136ec 100644
--- a/drivers/hwtracing/coresight/coresight-tmc-core.c
+++ b/drivers/hwtracing/coresight/coresight-tmc-core.c
@@ -403,6 +403,32 @@ static void tmc_get_reserved_region(struct device *parent)
drvdata->resrv_buf.paddr = res.start;
drvdata->resrv_buf.size = resource_size(&res);
+ /* Metadata region */
+ node = of_parse_phandle(parent->of_node, "memory-region", 1);
+ if (!node) {
+ dev_dbg(parent, "No metadata memory-region specified\n");
+ goto out;
+ }
+
+ rc = of_address_to_resource(node, 0, &res);
+ of_node_put(node);
+ if (rc || res.start == 0 || resource_size(&res) == 0) {
+ dev_err(parent, "Metadata memory is invalid\n");
+ goto out;
+ }
+
+ drvdata->metadata.vaddr = memremap(res.start,
+ resource_size(&res),
+ MEMREMAP_WB);
+ if (IS_ERR(drvdata->metadata.vaddr)) {
+ dev_err(parent, "Metadata memory mapping failed\n");
+ rc = PTR_ERR(drvdata->metadata.vaddr);
+ goto out;
+ }
+
+ drvdata->metadata.paddr = res.start;
+ drvdata->metadata.size = resource_size(&res);
+
out:
return;
}
diff --git a/drivers/hwtracing/coresight/coresight-tmc-etf.c b/drivers/hwtracing/coresight/coresight-tmc-etf.c
index 79d8c64eac49..1dfaa3ccfff7 100644
--- a/drivers/hwtracing/coresight/coresight-tmc-etf.c
+++ b/drivers/hwtracing/coresight/coresight-tmc-etf.c
@@ -588,6 +588,57 @@ static unsigned long tmc_update_etf_buffer(struct coresight_device *csdev,
return to_read;
}
+static int tmc_panic_sync_etf(struct coresight_device *csdev)
+{
+ u32 val;
+ struct tmc_register_snapshot *tmc;
+ struct tmc_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
+ struct csdev_access *csa = &drvdata->csdev->access;
+
+ /* Make sure we have valid reserved memory */
+ if (!drvdata->metadata.vaddr || !drvdata->resrv_buf.vaddr)
+ return 0;
+
+ tmc = (struct tmc_register_snapshot *)drvdata->metadata.vaddr;
+ tmc->valid = 0x0;
+
+ CS_UNLOCK(drvdata->base);
+
+ /* Proceed only if ETF is enabled or configured as sink */
+ val = readl(drvdata->base + TMC_CTL);
+ if (!(val & TMC_CTL_CAPT_EN))
+ goto out;
+
+ val = readl(drvdata->base + TMC_MODE);
+ if (val != TMC_MODE_CIRCULAR_BUFFER)
+ goto out;
+
+ tmc_flush_and_stop(drvdata);
+
+ /* Sync registers from hardware to metadata region */
+ tmc->sts = csdev_access_relaxed_read32(csa, TMC_STS);
+ tmc->trc_paddr = drvdata->resrv_buf.paddr;
+
+ /* Sync Internal SRAM to reserved trace buffer region */
+ tmc_etb_dump_hw(drvdata);
+ memcpy(drvdata->resrv_buf.vaddr, drvdata->buf, drvdata->len);
+ tmc->size = drvdata->len;
+
+ /*
+ * Make sure all previous writes are completed,
+ * before we mark valid
+ */
+ dsb(sy);
+ tmc->valid = 0x1;
+
+ tmc_disable_hw(drvdata);
+
+ dev_info(&csdev->dev, "%s: success\n", __func__);
+out:
+ CS_UNLOCK(drvdata->base);
+ return 0;
+}
+
static const struct coresight_ops_sink tmc_etf_sink_ops = {
.enable = tmc_enable_etf_sink,
.disable = tmc_disable_etf_sink,
@@ -601,6 +652,10 @@ static const struct coresight_ops_link tmc_etf_link_ops = {
.disable = tmc_disable_etf_link,
};
+static const struct coresight_ops_panic tmc_etf_sync_ops = {
+ .sync = tmc_panic_sync_etf,
+};
+
const struct coresight_ops tmc_etb_cs_ops = {
.sink_ops = &tmc_etf_sink_ops,
};
@@ -608,6 +663,7 @@ const struct coresight_ops tmc_etb_cs_ops = {
const struct coresight_ops tmc_etf_cs_ops = {
.sink_ops = &tmc_etf_sink_ops,
.link_ops = &tmc_etf_link_ops,
+ .panic_ops = &tmc_etf_sync_ops,
};
int tmc_read_prepare_etb(struct tmc_drvdata *drvdata)
diff --git a/drivers/hwtracing/coresight/coresight-tmc-etr.c b/drivers/hwtracing/coresight/coresight-tmc-etr.c
index 334226cd7201..1983a6772775 100644
--- a/drivers/hwtracing/coresight/coresight-tmc-etr.c
+++ b/drivers/hwtracing/coresight/coresight-tmc-etr.c
@@ -1803,6 +1803,53 @@ static int tmc_disable_etr_sink(struct coresight_device *csdev)
return 0;
}
+static int tmc_panic_sync_etr(struct coresight_device *csdev)
+{
+ u32 val;
+ struct tmc_register_snapshot *tmc;
+ struct tmc_drvdata *drvdata = dev_get_drvdata(csdev->dev.parent);
+ struct csdev_access *csa = &drvdata->csdev->access;
+
+ /* Being in RESRV mode implies valid reserved memory as well */
+ if (drvdata->etr_mode != ETR_MODE_RESRV)
+ return 0;
+
+ tmc = (struct tmc_register_snapshot *)drvdata->metadata.vaddr;
+ tmc->valid = 0x0;
+
+ CS_UNLOCK(drvdata->base);
+
+ /* Proceed only if ETR is enabled */
+ val = readl(drvdata->base + TMC_CTL);
+ if (!(val & TMC_CTL_CAPT_EN))
+ goto out;
+
+ tmc_flush_and_stop(drvdata);
+
+ /* Sync registers from hardware to metadata region */
+ tmc->size = csdev_access_relaxed_read32(csa, TMC_RSZ);
+ tmc->sts = csdev_access_relaxed_read32(csa, TMC_RSZ);
+ tmc->rrp = tmc_read_rrp(drvdata);
+ tmc->rwp = tmc_read_rwp(drvdata);
+ tmc->dba = tmc_read_dba(drvdata);
+ tmc->trc_paddr = drvdata->resrv_buf.paddr;
+
+ /*
+ * Make sure all previous writes are completed,
+ * before we mark valid
+ */
+ dsb(sy);
+ tmc->valid = 0x1;
+
+ tmc_disable_hw(drvdata);
+
+ dev_info(&csdev->dev, "%s: success\n", __func__);
+out:
+ CS_UNLOCK(drvdata->base);
+
+ return 0;
+}
+
static const struct coresight_ops_sink tmc_etr_sink_ops = {
.enable = tmc_enable_etr_sink,
.disable = tmc_disable_etr_sink,
@@ -1811,8 +1858,13 @@ static const struct coresight_ops_sink tmc_etr_sink_ops = {
.free_buffer = tmc_free_etr_buffer,
};
+static const struct coresight_ops_panic tmc_etr_sync_ops = {
+ .sync = tmc_panic_sync_etr,
+};
+
const struct coresight_ops tmc_etr_cs_ops = {
.sink_ops = &tmc_etr_sink_ops,
+ .panic_ops = &tmc_etr_sync_ops,
};
int tmc_read_prepare_etr(struct tmc_drvdata *drvdata)
diff --git a/drivers/hwtracing/coresight/coresight-tmc.h b/drivers/hwtracing/coresight/coresight-tmc.h
index 942fcd960586..af93d3ce0e78 100644
--- a/drivers/hwtracing/coresight/coresight-tmc.h
+++ b/drivers/hwtracing/coresight/coresight-tmc.h
@@ -131,6 +131,19 @@ enum tmc_mem_intf_width {
#define CORESIGHT_SOC_600_ETR_CAPS \
(TMC_ETR_SAVE_RESTORE | TMC_ETR_AXI_ARCACHE)
+/* TMC metadata region for ETR and ETF configurations */
+struct tmc_register_snapshot {
+ uint32_t valid; /* Indicate if this ETF/ETR was enabled */
+ uint32_t size; /* Size of trace data */
+ uint32_t sts; /* Status register */
+ uint32_t reserved32[3];
+ uint64_t rrp; /* Read pointer */
+ uint64_t rwp; /* Write pointer */
+ uint64_t dba; /* Data buffer address */
+ uint64_t trc_paddr; /* Phys address of trace buffer */
+ uint64_t reserved64[3];
+};
+
enum etr_mode {
ETR_MODE_FLAT, /* Uses contiguous flat buffer */
ETR_MODE_ETR_SG, /* Uses in-built TMC ETR SG mechanism */
@@ -201,6 +214,7 @@ struct tmc_resrv_buf {
* @sysfs_buf: SYSFS buffer for ETR.
* @perf_buf: PERF buffer for ETR.
* @resrv_buf: Reserved Memory for trace data buffer. Used by ETR/ETF.
+ * @metadata: Reserved memory for metadata. Used by ETR/ETF.
*/
struct tmc_drvdata {
void __iomem *base;
@@ -227,6 +241,7 @@ struct tmc_drvdata {
struct etr_buf *sysfs_buf;
struct etr_buf *perf_buf;
struct tmc_resrv_buf resrv_buf;
+ struct tmc_resrv_buf metadata;
};
struct etr_buf_operations {
@@ -349,7 +364,9 @@ static inline bool is_tmc_reserved_region_valid(struct device *dev)
struct tmc_drvdata *drvdata = dev_get_drvdata(dev);
if (drvdata->resrv_buf.paddr &&
- drvdata->resrv_buf.size)
+ drvdata->resrv_buf.size &&
+ drvdata->metadata.paddr &&
+ drvdata->metadata.size)
return true;
return false;
}
--
2.41.0
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