[PATCH 0/9] remoteproc: qcom: post mortem debug support

[PATCH 0/9] remoteproc: qcom: post mortem debug support

[Bjorn Andersson]

The following series introduces two components that aids in post mortem
debugging of Qualcomm systems. The first part is used to store information
about loaded images in IMEM, for post mortem tools to know where the kernel
loaded the remoteproc firmware. The second part invokes a stop operation on the
remoteprocs during a kernel panic, in order to trigger them to flush caches
etc.

Bjorn Andersson (9):
  remoteproc: qcom: Introduce driver to store pil info in IMEM
  remoteproc: qcom: mss: Update IMEM PIL info on load
  remoteproc: qcom: pas: Update IMEM PIL info on load
  remoteproc: qcom: wcnss: Update IMEM PIL info on load
  arm64: dts: qcom: qcs404: Add IMEM and PIL info region
  arm64: dts: qcom: sdm845: Add IMEM and PIL info region
  remoteproc: Introduce "panic" callback in ops
  remoteproc: qcom: q6v5: Add common panic handler
  remoteproc: qcom: Introduce panic handler for PAS and ADSP

 arch/arm64/boot/dts/qcom/qcs404.dtsi |  10 ++
 arch/arm64/boot/dts/qcom/sdm845.dtsi |  10 ++
 drivers/remoteproc/Kconfig           |   6 ++
 drivers/remoteproc/Makefile          |   1 +
 drivers/remoteproc/qcom_pil_info.c   | 139 +++++++++++++++++++++++++++
 drivers/remoteproc/qcom_pil_info.h   |   6 ++
 drivers/remoteproc/qcom_q6v5.c       |  19 ++++
 drivers/remoteproc/qcom_q6v5.h       |   1 +
 drivers/remoteproc/qcom_q6v5_adsp.c  |   8 ++
 drivers/remoteproc/qcom_q6v5_mss.c   |   3 +
 drivers/remoteproc/qcom_q6v5_pas.c   |  23 ++++-
 drivers/remoteproc/qcom_wcnss.c      |  14 ++-
 drivers/remoteproc/remoteproc_core.c |  16 +++
 include/linux/remoteproc.h           |   3 +
 14 files changed, 253 insertions(+), 6 deletions(-)
 create mode 100644 drivers/remoteproc/qcom_pil_info.c
 create mode 100644 drivers/remoteproc/qcom_pil_info.h

-- 
2.18.0

[PATCH 1/9] remoteproc: qcom: Introduce driver to store pil info in IMEM

[Bjorn Andersson]

A region in IMEM is used to communicate load addresses of remoteproc to
post mortem debug tools. Implement a driver that can be used to store
this information in order to enable these tools to process collected
ramdumps.

Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
---
 drivers/remoteproc/Kconfig         |   3 +
 drivers/remoteproc/Makefile        |   1 +
 drivers/remoteproc/qcom_pil_info.c | 139 +++++++++++++++++++++++++++++
 drivers/remoteproc/qcom_pil_info.h |   6 ++
 4 files changed, 149 insertions(+)
 create mode 100644 drivers/remoteproc/qcom_pil_info.c
 create mode 100644 drivers/remoteproc/qcom_pil_info.h

diff --git a/drivers/remoteproc/Kconfig b/drivers/remoteproc/Kconfig
index 28ed306982f7..3984bd16e670 100644
--- a/drivers/remoteproc/Kconfig
+++ b/drivers/remoteproc/Kconfig
@@ -85,6 +85,9 @@ config KEYSTONE_REMOTEPROC
 	  It's safe to say N here if you're not interested in the Keystone
 	  DSPs or just want to use a bare minimum kernel.
 
+config QCOM_PIL_INFO
+	tristate
+
 config QCOM_RPROC_COMMON
 	tristate
 
diff --git a/drivers/remoteproc/Makefile b/drivers/remoteproc/Makefile
index 00f09e658cb3..c1b46e9033cb 100644
--- a/drivers/remoteproc/Makefile
+++ b/drivers/remoteproc/Makefile
@@ -14,6 +14,7 @@ obj-$(CONFIG_OMAP_REMOTEPROC)		+= omap_remoteproc.o
 obj-$(CONFIG_WKUP_M3_RPROC)		+= wkup_m3_rproc.o
 obj-$(CONFIG_DA8XX_REMOTEPROC)		+= da8xx_remoteproc.o
 obj-$(CONFIG_KEYSTONE_REMOTEPROC)	+= keystone_remoteproc.o
+obj-$(CONFIG_QCOM_PIL_INFO)		+= qcom_pil_info.o
 obj-$(CONFIG_QCOM_RPROC_COMMON)		+= qcom_common.o
 obj-$(CONFIG_QCOM_Q6V5_COMMON)		+= qcom_q6v5.o
 obj-$(CONFIG_QCOM_Q6V5_ADSP)		+= qcom_q6v5_adsp.o
diff --git a/drivers/remoteproc/qcom_pil_info.c b/drivers/remoteproc/qcom_pil_info.c
new file mode 100644
index 000000000000..aa42732016f3
--- /dev/null
+++ b/drivers/remoteproc/qcom_pil_info.c
@@ -0,0 +1,139 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2019 Linaro Ltd.
+ */
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/of.h>
+#include <linux/platform_device.h>
+#include <linux/mutex.h>
+#include <linux/regmap.h>
+#include <linux/mfd/syscon.h>
+#include <linux/slab.h>
+
+struct pil_reloc_entry {
+	char name[8];
+	__le64 base;
+	__le32 size;
+} __packed;
+
+#define PIL_INFO_SIZE	200
+#define PIL_INFO_ENTRIES (PIL_INFO_SIZE / sizeof(struct pil_reloc_entry))
+
+struct pil_reloc {
+	struct device *dev;
+	struct regmap *map;
+	u32 offset;
+	int val_bytes;
+
+	struct pil_reloc_entry entries[PIL_INFO_ENTRIES];
+};
+
+static struct pil_reloc *_reloc;
+static DEFINE_MUTEX(reloc_mutex);
+
+/**
+ * qcom_pil_info_store() - store PIL information of image in IMEM
+ * @image:	name of the image
+ * @base:	base address of the loaded image
+ * @size:	size of the loaded image
+ */
+void qcom_pil_info_store(const char *image, phys_addr_t base, size_t size)
+{
+	struct pil_reloc_entry *entry;
+	int idx = -1;
+	int i;
+
+	mutex_lock(&reloc_mutex);
+	if (!_reloc)
+		goto unlock;
+
+	for (i = 0; i < PIL_INFO_ENTRIES; i++) {
+		if (!_reloc->entries[i].name[0]) {
+			if (idx == -1)
+				idx = i;
+			continue;
+		}
+
+		if (!strncmp(_reloc->entries[i].name, image, 8)) {
+			idx = i;
+			goto found;
+		}
+	}
+
+	if (idx) {
+		dev_warn(_reloc->dev, "insufficient PIL info slots\n");
+		goto unlock;
+	}
+
+found:
+	entry = &_reloc->entries[idx];
+	stracpy(entry->name, image);
+	entry->base = base;
+	entry->size = size;
+
+	regmap_bulk_write(_reloc->map, _reloc->offset + idx * sizeof(*entry),
+			  entry, sizeof(*entry) / _reloc->val_bytes);
+
+unlock:
+	mutex_unlock(&reloc_mutex);
+}
+EXPORT_SYMBOL_GPL(qcom_pil_info_store);
+
+static int pil_reloc_probe(struct platform_device *pdev)
+{
+	struct pil_reloc *reloc;
+
+	reloc = devm_kzalloc(&pdev->dev, sizeof(*reloc), GFP_KERNEL);
+	if (!reloc)
+		return -ENOMEM;
+
+	reloc->dev = &pdev->dev;
+	reloc->map = syscon_node_to_regmap(pdev->dev.parent->of_node);
+	if (IS_ERR(reloc->map))
+		return PTR_ERR(reloc->map);
+
+	if (of_property_read_u32(pdev->dev.of_node, "offset", &reloc->offset))
+		return -EINVAL;
+
+	reloc->val_bytes = regmap_get_val_bytes(reloc->map);
+	if (reloc->val_bytes < 0)
+		return -EINVAL;
+
+	regmap_bulk_write(reloc->map, reloc->offset, reloc->entries,
+			  sizeof(reloc->entries) / reloc->val_bytes);
+
+	mutex_lock(&reloc_mutex);
+	_reloc = reloc;
+	mutex_unlock(&reloc_mutex);
+
+	return 0;
+}
+
+static int pil_reloc_remove(struct platform_device *pdev)
+{
+	mutex_lock(&reloc_mutex);
+	_reloc = NULL;
+	mutex_unlock(&reloc_mutex);
+
+	return 0;
+}
+
+static const struct of_device_id pil_reloc_of_match[] = {
+	{ .compatible = "qcom,pil-reloc-info" },
+	{}
+};
+MODULE_DEVICE_TABLE(of, pil_reloc_of_match);
+
+static struct platform_driver pil_reloc_driver = {
+	.probe = pil_reloc_probe,
+	.remove = pil_reloc_remove,
+	.driver = {
+		.name = "qcom-pil-reloc-info",
+		.of_match_table = pil_reloc_of_match,
+	},
+};
+module_platform_driver(pil_reloc_driver);
+
+MODULE_DESCRIPTION("Qualcomm PIL relocation info");
+MODULE_LICENSE("GPL v2");
diff --git a/drivers/remoteproc/qcom_pil_info.h b/drivers/remoteproc/qcom_pil_info.h
new file mode 100644
index 000000000000..c30c186b665d
--- /dev/null
+++ b/drivers/remoteproc/qcom_pil_info.h
@@ -0,0 +1,6 @@
+#ifndef __QCOM_PIL_INFO_H__
+#define __QCOM_PIL_INFO_H__
+
+void qcom_pil_info_store(const char *image, phys_addr_t base, size_t size);
+
+#endif
-- 
2.18.0

[PATCH 2/9] remoteproc: qcom: mss: Update IMEM PIL info on load

[Bjorn Andersson]

As the MPSS address is calculated during load store it, and the size, in
the PIL info region structure in IMEM.

Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
---
 drivers/remoteproc/Kconfig         | 1 +
 drivers/remoteproc/qcom_q6v5_mss.c | 3 +++
 2 files changed, 4 insertions(+)

diff --git a/drivers/remoteproc/Kconfig b/drivers/remoteproc/Kconfig
index 3984bd16e670..b88d74632d39 100644
--- a/drivers/remoteproc/Kconfig
+++ b/drivers/remoteproc/Kconfig
@@ -119,6 +119,7 @@ config QCOM_Q6V5_MSS
 	depends on RPMSG_QCOM_GLINK_SMEM || RPMSG_QCOM_GLINK_SMEM=n
 	depends on QCOM_SYSMON || QCOM_SYSMON=n
 	select MFD_SYSCON
+	select QCOM_PIL_INFO
 	select QCOM_MDT_LOADER
 	select QCOM_Q6V5_COMMON
 	select QCOM_RPROC_COMMON
diff --git a/drivers/remoteproc/qcom_q6v5_mss.c b/drivers/remoteproc/qcom_q6v5_mss.c
index 8fcf9d28dd73..d9192fa40e05 100644
--- a/drivers/remoteproc/qcom_q6v5_mss.c
+++ b/drivers/remoteproc/qcom_q6v5_mss.c
@@ -28,6 +28,7 @@
 
 #include "remoteproc_internal.h"
 #include "qcom_common.h"
+#include "qcom_pil_info.h"
 #include "qcom_q6v5.h"
 
 #include <linux/qcom_scm.h>
@@ -1040,6 +1041,8 @@ static int q6v5_mpss_load(struct q6v5 *qproc)
 	else if (ret < 0)
 		dev_err(qproc->dev, "MPSS authentication failed: %d\n", ret);
 
+	qcom_pil_info_store("modem", mpss_reloc, qproc->mpss_size);
+
 release_firmware:
 	release_firmware(fw);
 out:
-- 
2.18.0

[PATCH 3/9] remoteproc: qcom: pas: Update IMEM PIL info on load

[Bjorn Andersson]

Use the sysmon_name as identifier and store the relocated base address
and size of the memory region in the PIL reloation info structure in
IMEM.

Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
---
 drivers/remoteproc/Kconfig         |  1 +
 drivers/remoteproc/qcom_q6v5_pas.c | 15 ++++++++++++---
 2 files changed, 13 insertions(+), 3 deletions(-)

diff --git a/drivers/remoteproc/Kconfig b/drivers/remoteproc/Kconfig
index b88d74632d39..2aa0743fc05b 100644
--- a/drivers/remoteproc/Kconfig
+++ b/drivers/remoteproc/Kconfig
@@ -136,6 +136,7 @@ config QCOM_Q6V5_PAS
 	depends on RPMSG_QCOM_GLINK_SMEM || RPMSG_QCOM_GLINK_SMEM=n
 	depends on QCOM_SYSMON || QCOM_SYSMON=n
 	select MFD_SYSCON
+	select QCOM_PIL_INFO
 	select QCOM_MDT_LOADER
 	select QCOM_Q6V5_COMMON
 	select QCOM_RPROC_COMMON
diff --git a/drivers/remoteproc/qcom_q6v5_pas.c b/drivers/remoteproc/qcom_q6v5_pas.c
index db4b3c4bacd7..bfb622d36cb3 100644
--- a/drivers/remoteproc/qcom_q6v5_pas.c
+++ b/drivers/remoteproc/qcom_q6v5_pas.c
@@ -23,6 +23,7 @@
 #include <linux/soc/qcom/smem_state.h>
 
 #include "qcom_common.h"
+#include "qcom_pil_info.h"
 #include "qcom_q6v5.h"
 #include "remoteproc_internal.h"
 
@@ -52,6 +53,7 @@ struct qcom_adsp {
 	int pas_id;
 	int crash_reason_smem;
 	bool has_aggre2_clk;
+	const char *info_name;
 
 	struct completion start_done;
 	struct completion stop_done;
@@ -70,11 +72,17 @@ struct qcom_adsp {
 static int adsp_load(struct rproc *rproc, const struct firmware *fw)
 {
 	struct qcom_adsp *adsp = (struct qcom_adsp *)rproc->priv;
+	int ret;
 
-	return qcom_mdt_load(adsp->dev, fw, rproc->firmware, adsp->pas_id,
-			     adsp->mem_region, adsp->mem_phys, adsp->mem_size,
-			     &adsp->mem_reloc);
+	ret = qcom_mdt_load(adsp->dev, fw, rproc->firmware, adsp->pas_id,
+			    adsp->mem_region, adsp->mem_phys, adsp->mem_size,
+			    &adsp->mem_reloc);
+	if (ret)
+		return ret;
 
+	qcom_pil_info_store(adsp->info_name, adsp->mem_reloc, adsp->mem_size);
+
+	return 0;
 }
 
 static int adsp_start(struct rproc *rproc)
@@ -278,6 +286,7 @@ static int adsp_probe(struct platform_device *pdev)
 	adsp->rproc = rproc;
 	adsp->pas_id = desc->pas_id;
 	adsp->has_aggre2_clk = desc->has_aggre2_clk;
+	adsp->info_name = desc->sysmon_name;
 	platform_set_drvdata(pdev, adsp);
 
 	ret = adsp_alloc_memory_region(adsp);
-- 
2.18.0

[PATCH 4/9] remoteproc: qcom: wcnss: Update IMEM PIL info on load

[Bjorn Andersson]

Store the relocated base address and size in the PIL relocation info
structure in IMEM.

Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
---
 drivers/remoteproc/Kconfig      |  1 +
 drivers/remoteproc/qcom_wcnss.c | 14 +++++++++++---
 2 files changed, 12 insertions(+), 3 deletions(-)

diff --git a/drivers/remoteproc/Kconfig b/drivers/remoteproc/Kconfig
index 2aa0743fc05b..3f976ce3df3c 100644
--- a/drivers/remoteproc/Kconfig
+++ b/drivers/remoteproc/Kconfig
@@ -185,6 +185,7 @@ config QCOM_WCNSS_PIL
 	depends on QCOM_SMEM
 	depends on QCOM_SYSMON || QCOM_SYSMON=n
 	select QCOM_MDT_LOADER
+	select QCOM_PIL_INFO
 	select QCOM_RPROC_COMMON
 	select QCOM_SCM
 	help
diff --git a/drivers/remoteproc/qcom_wcnss.c b/drivers/remoteproc/qcom_wcnss.c
index dc135754bb9c..9db9a3d25af4 100644
--- a/drivers/remoteproc/qcom_wcnss.c
+++ b/drivers/remoteproc/qcom_wcnss.c
@@ -27,6 +27,7 @@
 
 #include "qcom_common.h"
 #include "remoteproc_internal.h"
+#include "qcom_pil_info.h"
 #include "qcom_wcnss.h"
 
 #define WCNSS_CRASH_REASON_SMEM		422
@@ -145,10 +146,17 @@ void qcom_wcnss_assign_iris(struct qcom_wcnss *wcnss,
 static int wcnss_load(struct rproc *rproc, const struct firmware *fw)
 {
 	struct qcom_wcnss *wcnss = (struct qcom_wcnss *)rproc->priv;
+	int ret;
+
+	ret = qcom_mdt_load(wcnss->dev, fw, rproc->firmware, WCNSS_PAS_ID,
+			    wcnss->mem_region, wcnss->mem_phys,
+			    wcnss->mem_size, &wcnss->mem_reloc);
+	if (ret)
+		return ret;
+
+	qcom_pil_info_store("wcnss", wcnss->mem_reloc, wcnss->mem_size);
 
-	return qcom_mdt_load(wcnss->dev, fw, rproc->firmware, WCNSS_PAS_ID,
-			     wcnss->mem_region, wcnss->mem_phys,
-			     wcnss->mem_size, &wcnss->mem_reloc);
+	return 0;
 }
 
 static void wcnss_indicate_nv_download(struct qcom_wcnss *wcnss)
-- 
2.18.0

[PATCH 5/9] arm64: dts: qcom: qcs404: Add IMEM and PIL info region

[Bjorn Andersson]

Add a simple-mfd representing IMEM on QCS404 and define the PIL
relocation info region, so that post mortem tools will be able to locate
the loaded remoteprocs.

Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
---
 arch/arm64/boot/dts/qcom/qcs404.dtsi | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/qcs404.dtsi b/arch/arm64/boot/dts/qcom/qcs404.dtsi
index 3d0789775009..1604a9697832 100644
--- a/arch/arm64/boot/dts/qcom/qcs404.dtsi
+++ b/arch/arm64/boot/dts/qcom/qcs404.dtsi
@@ -845,6 +845,16 @@
 			status = "disabled";
 		};
 
+		imem@8600000 {
+			compatible = "syscon", "simple-mfd";
+			reg = <0x08600000 0x1000>;
+
+			pil-reloc {
+				compatible ="qcom,pil-reloc-info";
+				offset = <0x94c>;
+			};
+		};
+
 		intc: interrupt-controller@b000000 {
 			compatible = "qcom,msm-qgic2";
 			interrupt-controller;
-- 
2.18.0

[PATCH 6/9] arm64: dts: qcom: sdm845: Add IMEM and PIL info region

[Bjorn Andersson]

Add a simple-mfd representing IMEM on SDM845 and define the PIL
relocation info region, so that post mortem tools will be able to locate
the loaded remoteprocs.

Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
---
 arch/arm64/boot/dts/qcom/sdm845.dtsi | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/arch/arm64/boot/dts/qcom/sdm845.dtsi b/arch/arm64/boot/dts/qcom/sdm845.dtsi
index c8ebe21f7673..38a6b304dba3 100644
--- a/arch/arm64/boot/dts/qcom/sdm845.dtsi
+++ b/arch/arm64/boot/dts/qcom/sdm845.dtsi
@@ -2456,6 +2456,16 @@
 			cell-index = <0>;
 		};
 
+		imem@146bf000 {
+			compatible = "syscon", "simple-mfd";
+			reg = <0 0x146bf000 0 0x1000>;
+
+			pil-reloc {
+				compatible ="qcom,pil-reloc-info";
+				offset = <0x94c>;
+			};
+		};
+
 		apps_smmu: iommu@15000000 {
 			compatible = "qcom,sdm845-smmu-500", "arm,mmu-500";
 			reg = <0 0x15000000 0 0x80000>;
-- 
2.18.0

[PATCH 7/9] remoteproc: Introduce "panic" callback in ops

[Bjorn Andersson]

Introduce a "panic" function in the remoteproc ops table, to allow
remoteproc instances to perform operations needed in order to aid in
post mortem system debugging, such as flushing caches etc, when the
kernel panics.

Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
---
 drivers/remoteproc/remoteproc_core.c | 16 ++++++++++++++++
 include/linux/remoteproc.h           |  3 +++
 2 files changed, 19 insertions(+)

diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
index 3c5fbbbfb0f1..cc47797c6496 100644
--- a/drivers/remoteproc/remoteproc_core.c
+++ b/drivers/remoteproc/remoteproc_core.c
@@ -1833,6 +1833,16 @@ void rproc_shutdown(struct rproc *rproc)
 }
 EXPORT_SYMBOL(rproc_shutdown);
 
+static int rproc_panic_handler(struct notifier_block *nb, unsigned long event,
+			       void *ptr)
+{
+	struct rproc *rproc = container_of(nb, struct rproc, panic_nb);
+
+	rproc->ops->panic(rproc);
+
+	return NOTIFY_DONE;
+}
+
 /**
  * rproc_get_by_phandle() - find a remote processor by phandle
  * @phandle: phandle to the rproc
@@ -2058,6 +2068,12 @@ struct rproc *rproc_alloc(struct device *dev, const char *name,
 		rproc->ops->get_boot_addr = rproc_elf_get_boot_addr;
 	}
 
+	/* Register panic notifier for remoteprocs with "panic" callback */
+	if (rproc->ops->panic) {
+		rproc->panic_nb.notifier_call = rproc_panic_handler;
+		atomic_notifier_chain_register(&panic_notifier_list, &rproc->panic_nb);
+	}
+
 	mutex_init(&rproc->lock);
 
 	idr_init(&rproc->notifyids);
diff --git a/include/linux/remoteproc.h b/include/linux/remoteproc.h
index 16ad66683ad0..33553f6d8ff0 100644
--- a/include/linux/remoteproc.h
+++ b/include/linux/remoteproc.h
@@ -383,6 +383,7 @@ struct rproc_ops {
 	int (*load)(struct rproc *rproc, const struct firmware *fw);
 	int (*sanity_check)(struct rproc *rproc, const struct firmware *fw);
 	u32 (*get_boot_addr)(struct rproc *rproc, const struct firmware *fw);
+	void (*panic)(struct rproc *rproc);
 };
 
 /**
@@ -481,6 +482,7 @@ struct rproc_dump_segment {
  * @auto_boot: flag to indicate if remote processor should be auto-started
  * @dump_segments: list of segments in the firmware
  * @nb_vdev: number of vdev currently handled by rproc
+ * @panic_nb: notifier_block for remoteproc's panic handler
  */
 struct rproc {
 	struct list_head node;
@@ -514,6 +516,7 @@ struct rproc {
 	bool auto_boot;
 	struct list_head dump_segments;
 	int nb_vdev;
+	struct notifier_block panic_nb;
 };
 
 /**
-- 
2.18.0

[PATCH 8/9] remoteproc: qcom: q6v5: Add common panic handler

[Bjorn Andersson]

Add a common panic handler that invokes a stop request and sleep enough
to let the remoteproc flush it's caches etc in order to aid post mortem
debugging.

Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
---
 drivers/remoteproc/qcom_q6v5.c | 19 +++++++++++++++++++
 drivers/remoteproc/qcom_q6v5.h |  1 +
 2 files changed, 20 insertions(+)

diff --git a/drivers/remoteproc/qcom_q6v5.c b/drivers/remoteproc/qcom_q6v5.c
index 0d33e3079f0d..0aebae893362 100644
--- a/drivers/remoteproc/qcom_q6v5.c
+++ b/drivers/remoteproc/qcom_q6v5.c
@@ -6,6 +6,7 @@
  * Copyright (C) 2014 Sony Mobile Communications AB
  * Copyright (c) 2012-2013, The Linux Foundation. All rights reserved.
  */
+#include <linux/delay.h>
 #include <linux/kernel.h>
 #include <linux/platform_device.h>
 #include <linux/interrupt.h>
@@ -15,6 +16,8 @@
 #include <linux/remoteproc.h>
 #include "qcom_q6v5.h"
 
+#define Q6V5_PANIC_DELAY_MS	200
+
 /**
  * qcom_q6v5_prepare() - reinitialize the qcom_q6v5 context before start
  * @q6v5:	reference to qcom_q6v5 context to be reinitialized
@@ -162,6 +165,22 @@ int qcom_q6v5_request_stop(struct qcom_q6v5 *q6v5)
 }
 EXPORT_SYMBOL_GPL(qcom_q6v5_request_stop);
 
+/**
+ * qcom_q6v5_panic() - panic handler to invoke a stop on the remote
+ * @q6v5:	reference to qcom_q6v5 context
+ *
+ * Set the stop bit and sleep in order to allow the remote processor to flush
+ * its caches etc for post mortem debugging.
+ */
+void qcom_q6v5_panic(struct qcom_q6v5 *q6v5)
+{
+	qcom_smem_state_update_bits(q6v5->state,
+				    BIT(q6v5->stop_bit), BIT(q6v5->stop_bit));
+
+	mdelay(Q6V5_PANIC_DELAY_MS);
+}
+EXPORT_SYMBOL_GPL(qcom_q6v5_panic);
+
 /**
  * qcom_q6v5_init() - initializer of the q6v5 common struct
  * @q6v5:	handle to be initialized
diff --git a/drivers/remoteproc/qcom_q6v5.h b/drivers/remoteproc/qcom_q6v5.h
index 7ac92c1e0f49..c37e6fd063e4 100644
--- a/drivers/remoteproc/qcom_q6v5.h
+++ b/drivers/remoteproc/qcom_q6v5.h
@@ -42,5 +42,6 @@ int qcom_q6v5_prepare(struct qcom_q6v5 *q6v5);
 int qcom_q6v5_unprepare(struct qcom_q6v5 *q6v5);
 int qcom_q6v5_request_stop(struct qcom_q6v5 *q6v5);
 int qcom_q6v5_wait_for_start(struct qcom_q6v5 *q6v5, int timeout);
+void qcom_q6v5_panic(struct qcom_q6v5 *q6v5);
 
 #endif
-- 
2.18.0

[PATCH 9/9] remoteproc: qcom: Introduce panic handler for PAS and ADSP

[Bjorn Andersson]

Make the PAS and ADSP/CDSP remoteproc drivers implement the panic
handler that will invoke a stop to prepare the remoteprocs for post
mortem debugging.

Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
---
 drivers/remoteproc/qcom_q6v5_adsp.c | 8 ++++++++
 drivers/remoteproc/qcom_q6v5_pas.c  | 8 ++++++++
 2 files changed, 16 insertions(+)

diff --git a/drivers/remoteproc/qcom_q6v5_adsp.c b/drivers/remoteproc/qcom_q6v5_adsp.c
index e953886b2eb7..3de1683903db 100644
--- a/drivers/remoteproc/qcom_q6v5_adsp.c
+++ b/drivers/remoteproc/qcom_q6v5_adsp.c
@@ -282,12 +282,20 @@ static void *adsp_da_to_va(struct rproc *rproc, u64 da, int len)
 	return adsp->mem_region + offset;
 }
 
+static void adsp_panic(struct rproc *rproc)
+{
+	struct qcom_adsp *adsp = (struct qcom_adsp *)rproc->priv;
+
+	qcom_q6v5_panic(&adsp->q6v5);
+}
+
 static const struct rproc_ops adsp_ops = {
 	.start = adsp_start,
 	.stop = adsp_stop,
 	.da_to_va = adsp_da_to_va,
 	.parse_fw = qcom_register_dump_segments,
 	.load = adsp_load,
+	.panic = adsp_panic,
 };
 
 static int adsp_init_clock(struct qcom_adsp *adsp, const char **clk_ids)
diff --git a/drivers/remoteproc/qcom_q6v5_pas.c b/drivers/remoteproc/qcom_q6v5_pas.c
index bfb622d36cb3..31ff09bcd3ee 100644
--- a/drivers/remoteproc/qcom_q6v5_pas.c
+++ b/drivers/remoteproc/qcom_q6v5_pas.c
@@ -179,12 +179,20 @@ static void *adsp_da_to_va(struct rproc *rproc, u64 da, int len)
 	return adsp->mem_region + offset;
 }
 
+static void adsp_panic(struct rproc *rproc)
+{
+	struct qcom_adsp *adsp = (struct qcom_adsp *)rproc->priv;
+
+	qcom_q6v5_panic(&adsp->q6v5);
+}
+
 static const struct rproc_ops adsp_ops = {
 	.start = adsp_start,
 	.stop = adsp_stop,
 	.da_to_va = adsp_da_to_va,
 	.parse_fw = qcom_register_dump_segments,
 	.load = adsp_load,
+	.panic = adsp_panic,
 };
 
 static int adsp_init_clock(struct qcom_adsp *adsp)
-- 
2.18.0

Re: [PATCH 1/9] remoteproc: qcom: Introduce driver to store pil info in IMEM

[Suman Anna]

On 8/7/19 12:39 AM, Bjorn Andersson wrote:
> A region in IMEM is used to communicate load addresses of remoteproc to
> post mortem debug tools. Implement a driver that can be used to store
> this information in order to enable these tools to process collected
> ramdumps.
> 
> Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
> ---
>  drivers/remoteproc/Kconfig         |   3 +
>  drivers/remoteproc/Makefile        |   1 +
>  drivers/remoteproc/qcom_pil_info.c | 139 +++++++++++++++++++++++++++++
>  drivers/remoteproc/qcom_pil_info.h |   6 ++
>  4 files changed, 149 insertions(+)
>  create mode 100644 drivers/remoteproc/qcom_pil_info.c
>  create mode 100644 drivers/remoteproc/qcom_pil_info.h
> 
> diff --git a/drivers/remoteproc/Kconfig b/drivers/remoteproc/Kconfig
> index 28ed306982f7..3984bd16e670 100644
> --- a/drivers/remoteproc/Kconfig
> +++ b/drivers/remoteproc/Kconfig
> @@ -85,6 +85,9 @@ config KEYSTONE_REMOTEPROC
>  	  It's safe to say N here if you're not interested in the Keystone
>  	  DSPs or just want to use a bare minimum kernel.
>  
> +config QCOM_PIL_INFO
> +	tristate
> +
>  config QCOM_RPROC_COMMON
>  	tristate
>  
> diff --git a/drivers/remoteproc/Makefile b/drivers/remoteproc/Makefile
> index 00f09e658cb3..c1b46e9033cb 100644
> --- a/drivers/remoteproc/Makefile
> +++ b/drivers/remoteproc/Makefile
> @@ -14,6 +14,7 @@ obj-$(CONFIG_OMAP_REMOTEPROC)		+= omap_remoteproc.o
>  obj-$(CONFIG_WKUP_M3_RPROC)		+= wkup_m3_rproc.o
>  obj-$(CONFIG_DA8XX_REMOTEPROC)		+= da8xx_remoteproc.o
>  obj-$(CONFIG_KEYSTONE_REMOTEPROC)	+= keystone_remoteproc.o
> +obj-$(CONFIG_QCOM_PIL_INFO)		+= qcom_pil_info.o
>  obj-$(CONFIG_QCOM_RPROC_COMMON)		+= qcom_common.o
>  obj-$(CONFIG_QCOM_Q6V5_COMMON)		+= qcom_q6v5.o
>  obj-$(CONFIG_QCOM_Q6V5_ADSP)		+= qcom_q6v5_adsp.o
> diff --git a/drivers/remoteproc/qcom_pil_info.c b/drivers/remoteproc/qcom_pil_info.c
> new file mode 100644
> index 000000000000..aa42732016f3
> --- /dev/null
> +++ b/drivers/remoteproc/qcom_pil_info.c
> @@ -0,0 +1,139 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Copyright (c) 2019 Linaro Ltd.
> + */
> +#include <linux/module.h>
> +#include <linux/kernel.h>
> +#include <linux/of.h>
> +#include <linux/platform_device.h>
> +#include <linux/mutex.h>
> +#include <linux/regmap.h>
> +#include <linux/mfd/syscon.h>
> +#include <linux/slab.h>
> +
> +struct pil_reloc_entry {
> +	char name[8];
> +	__le64 base;
> +	__le32 size;
> +} __packed;
> +
> +#define PIL_INFO_SIZE	200
> +#define PIL_INFO_ENTRIES (PIL_INFO_SIZE / sizeof(struct pil_reloc_entry))
> +
> +struct pil_reloc {
> +	struct device *dev;
> +	struct regmap *map;
> +	u32 offset;
> +	int val_bytes;
> +
> +	struct pil_reloc_entry entries[PIL_INFO_ENTRIES];
> +};
> +
> +static struct pil_reloc *_reloc;
> +static DEFINE_MUTEX(reloc_mutex);
> +
> +/**
> + * qcom_pil_info_store() - store PIL information of image in IMEM
> + * @image:	name of the image
> + * @base:	base address of the loaded image
> + * @size:	size of the loaded image
> + */
> +void qcom_pil_info_store(const char *image, phys_addr_t base, size_t size)
> +{
> +	struct pil_reloc_entry *entry;
> +	int idx = -1;
> +	int i;
> +
> +	mutex_lock(&reloc_mutex);
> +	if (!_reloc)
> +		goto unlock;
> +
> +	for (i = 0; i < PIL_INFO_ENTRIES; i++) {
> +		if (!_reloc->entries[i].name[0]) {
> +			if (idx == -1)
> +				idx = i;
> +			continue;
> +		}
> +
> +		if (!strncmp(_reloc->entries[i].name, image, 8)) {
> +			idx = i;
> +			goto found;
> +		}
> +	}
> +
> +	if (idx) {
> +		dev_warn(_reloc->dev, "insufficient PIL info slots\n");
> +		goto unlock;
> +	}
> +
> +found:
> +	entry = &_reloc->entries[idx];
> +	stracpy(entry->name, image);
> +	entry->base = base;
> +	entry->size = size;
> +
> +	regmap_bulk_write(_reloc->map, _reloc->offset + idx * sizeof(*entry),
> +			  entry, sizeof(*entry) / _reloc->val_bytes);
> +
> +unlock:
> +	mutex_unlock(&reloc_mutex);
> +}
> +EXPORT_SYMBOL_GPL(qcom_pil_info_store);
> +
> +static int pil_reloc_probe(struct platform_device *pdev)
> +{
> +	struct pil_reloc *reloc;
> +
> +	reloc = devm_kzalloc(&pdev->dev, sizeof(*reloc), GFP_KERNEL);
> +	if (!reloc)
> +		return -ENOMEM;
> +
> +	reloc->dev = &pdev->dev;
> +	reloc->map = syscon_node_to_regmap(pdev->dev.parent->of_node);
> +	if (IS_ERR(reloc->map))
> +		return PTR_ERR(reloc->map);
> +
> +	if (of_property_read_u32(pdev->dev.of_node, "offset", &reloc->offset))
> +		return -EINVAL;
> +
> +	reloc->val_bytes = regmap_get_val_bytes(reloc->map);
> +	if (reloc->val_bytes < 0)
> +		return -EINVAL;
> +
> +	regmap_bulk_write(reloc->map, reloc->offset, reloc->entries,
> +			  sizeof(reloc->entries) / reloc->val_bytes);
> +
> +	mutex_lock(&reloc_mutex);
> +	_reloc = reloc;
> +	mutex_unlock(&reloc_mutex);
> +
> +	return 0;
> +}
> +
> +static int pil_reloc_remove(struct platform_device *pdev)
> +{
> +	mutex_lock(&reloc_mutex);
> +	_reloc = NULL;
> +	mutex_unlock(&reloc_mutex);
> +
> +	return 0;
> +}
> +
> +static const struct of_device_id pil_reloc_of_match[] = {
> +	{ .compatible = "qcom,pil-reloc-info" },
> +	{}
> +};
> +MODULE_DEVICE_TABLE(of, pil_reloc_of_match);
> +
> +static struct platform_driver pil_reloc_driver = {
> +	.probe = pil_reloc_probe,
> +	.remove = pil_reloc_remove,
> +	.driver = {
> +		.name = "qcom-pil-reloc-info",
> +		.of_match_table = pil_reloc_of_match,
> +	},
> +};
> +module_platform_driver(pil_reloc_driver);
> +
> +MODULE_DESCRIPTION("Qualcomm PIL relocation info");
> +MODULE_LICENSE("GPL v2");
> diff --git a/drivers/remoteproc/qcom_pil_info.h b/drivers/remoteproc/qcom_pil_info.h
> new file mode 100644
> index 000000000000..c30c186b665d
> --- /dev/null
> +++ b/drivers/remoteproc/qcom_pil_info.h
> @@ -0,0 +1,6 @@

Please add a SPDX license identifier.

regards
Suman

> +#ifndef __QCOM_PIL_INFO_H__
> +#define __QCOM_PIL_INFO_H__
> +
> +void qcom_pil_info_store(const char *image, phys_addr_t base, size_t size);
> +
> +#endif
> 

Re: [PATCH 7/9] remoteproc: Introduce "panic" callback in ops

[Suman Anna]

On 8/7/19 12:39 AM, Bjorn Andersson wrote:
> Introduce a "panic" function in the remoteproc ops table, to allow
> remoteproc instances to perform operations needed in order to aid in
> post mortem system debugging, such as flushing caches etc, when the
> kernel panics.
> 
> Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
> ---
>  drivers/remoteproc/remoteproc_core.c | 16 ++++++++++++++++
>  include/linux/remoteproc.h           |  3 +++
>  2 files changed, 19 insertions(+)
> 
> diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
> index 3c5fbbbfb0f1..cc47797c6496 100644
> --- a/drivers/remoteproc/remoteproc_core.c
> +++ b/drivers/remoteproc/remoteproc_core.c
> @@ -1833,6 +1833,16 @@ void rproc_shutdown(struct rproc *rproc)
>  }
>  EXPORT_SYMBOL(rproc_shutdown);
>  
> +static int rproc_panic_handler(struct notifier_block *nb, unsigned long event,
> +			       void *ptr)
> +{
> +	struct rproc *rproc = container_of(nb, struct rproc, panic_nb);
> +
> +	rproc->ops->panic(rproc);
> +
> +	return NOTIFY_DONE;
> +}
> +
>  /**
>   * rproc_get_by_phandle() - find a remote processor by phandle
>   * @phandle: phandle to the rproc
> @@ -2058,6 +2068,12 @@ struct rproc *rproc_alloc(struct device *dev, const char *name,
>  		rproc->ops->get_boot_addr = rproc_elf_get_boot_addr;
>  	}
>  
> +	/* Register panic notifier for remoteprocs with "panic" callback */
> +	if (rproc->ops->panic) {
> +		rproc->panic_nb.notifier_call = rproc_panic_handler;
> +		atomic_notifier_chain_register(&panic_notifier_list, &rproc->panic_nb);
> +	}
> +
>  	mutex_init(&rproc->lock);
>  
>  	idr_init(&rproc->notifyids);
> diff --git a/include/linux/remoteproc.h b/include/linux/remoteproc.h
> index 16ad66683ad0..33553f6d8ff0 100644
> --- a/include/linux/remoteproc.h
> +++ b/include/linux/remoteproc.h
> @@ -383,6 +383,7 @@ struct rproc_ops {
>  	int (*load)(struct rproc *rproc, const struct firmware *fw);
>  	int (*sanity_check)(struct rproc *rproc, const struct firmware *fw);
>  	u32 (*get_boot_addr)(struct rproc *rproc, const struct firmware *fw);
> +	void (*panic)(struct rproc *rproc);

Do add the kernel doc comment for the new callback op.

regards
Suman

>  };
>  
>  /**
> @@ -481,6 +482,7 @@ struct rproc_dump_segment {
>   * @auto_boot: flag to indicate if remote processor should be auto-started
>   * @dump_segments: list of segments in the firmware
>   * @nb_vdev: number of vdev currently handled by rproc
> + * @panic_nb: notifier_block for remoteproc's panic handler
>   */
>  struct rproc {
>  	struct list_head node;
> @@ -514,6 +516,7 @@ struct rproc {
>  	bool auto_boot;
>  	struct list_head dump_segments;
>  	int nb_vdev;
> +	struct notifier_block panic_nb;
>  };
>  
>  /**
>