[PATCH v5 11/17] qcom_minidump: Register ramoops region with minidump

[Mukesh Ojha <quic_mojha@quicinc.com>]

Register all the pstore frontend with minidump, so that they can
be dumped as default Linux minidump region to be collected on
SoC where minidump is enabled.

Helper functions is written in separate file and built along with
the minidump driver, since it is client of minidump and also call
it at appropriate place from minidump probe so that they always
get registered.

While at it also rename the out minidump module object name during
build as qcom_apss_minidump which basically depicts as Qualcomm
Application processor subsystem minidump.

Signed-off-by: Mukesh Ojha <quic_mojha@quicinc.com>
---
 drivers/soc/qcom/Kconfig                 |  1 +
 drivers/soc/qcom/Makefile                |  3 +-
 drivers/soc/qcom/qcom_minidump.c         |  4 ++
 drivers/soc/qcom/qcom_ramoops_minidump.c | 88 ++++++++++++++++++++++++++++++++
 drivers/soc/qcom/qcom_ramoops_minidump.h | 10 ++++
 5 files changed, 105 insertions(+), 1 deletion(-)
 create mode 100644 drivers/soc/qcom/qcom_ramoops_minidump.c
 create mode 100644 drivers/soc/qcom/qcom_ramoops_minidump.h

diff --git a/drivers/soc/qcom/Kconfig b/drivers/soc/qcom/Kconfig
index 4b36d46807bc..b3977f1687d8 100644
--- a/drivers/soc/qcom/Kconfig
+++ b/drivers/soc/qcom/Kconfig
@@ -305,6 +305,7 @@ config QCOM_MINIDUMP
 	tristate "QCOM APSS Minidump driver"
 	depends on ARCH_QCOM || COMPILE_TEST
 	depends on QCOM_SMEM
+	depends on PSTORE
 	help
 	  This config enables linux core infrastructure for Application
 	  processor subsystem (APSS) minidump collection i.e, it enables
diff --git a/drivers/soc/qcom/Makefile b/drivers/soc/qcom/Makefile
index 9c1a409679ec..fca80df8b5b1 100644
--- a/drivers/soc/qcom/Makefile
+++ b/drivers/soc/qcom/Makefile
@@ -36,4 +36,5 @@ obj-$(CONFIG_QCOM_ICC_BWMON)	+= icc-bwmon.o
 qcom_ice-objs			+= ice.o
 obj-$(CONFIG_QCOM_INLINE_CRYPTO_ENGINE)	+= qcom_ice.o
 obj-$(CONFIG_QCOM_RPROC_MINIDUMP)	+= qcom_rproc_minidump.o
-obj-$(CONFIG_QCOM_MINIDUMP)		+= qcom_minidump.o
+obj-$(CONFIG_QCOM_MINIDUMP)		+= qcom_apss_minidump.o
+qcom_apss_minidump-objs			+= qcom_minidump.o qcom_ramoops_minidump.o
diff --git a/drivers/soc/qcom/qcom_minidump.c b/drivers/soc/qcom/qcom_minidump.c
index 4ce36f154e89..7930a80b9100 100644
--- a/drivers/soc/qcom/qcom_minidump.c
+++ b/drivers/soc/qcom/qcom_minidump.c
@@ -23,6 +23,7 @@
 #include <soc/qcom/qcom_minidump.h>
 
 #include "qcom_minidump_internal.h"
+#include "qcom_ramoops_minidump.h"
 
 /**
  * struct minidump_ss_data - Minidump subsystem private data
@@ -688,6 +689,8 @@ static int qcom_apss_minidump_probe(struct platform_device *pdev)
 		return ret;
 	}
 
+	qcom_ramoops_minidump_register(md->dev);
+
 	mutex_lock(&md_plist.plock);
 	platform_set_drvdata(pdev, md);
 	qcom_apss_register_pending_regions(md);
@@ -701,6 +704,7 @@ static int qcom_apss_minidump_remove(struct platform_device *pdev)
 	struct minidump *md = platform_get_drvdata(pdev);
 	struct minidump_ss_data *mdss_data;
 
+	qcom_ramoops_minidump_unregister();
 	mdss_data = md->apss_data;
 	memset(mdss_data->md_ss_toc, cpu_to_le32(0), sizeof(struct minidump_subsystem));
 	md = NULL;
diff --git a/drivers/soc/qcom/qcom_ramoops_minidump.c b/drivers/soc/qcom/qcom_ramoops_minidump.c
new file mode 100644
index 000000000000..eb97310e3858
--- /dev/null
+++ b/drivers/soc/qcom/qcom_ramoops_minidump.c
@@ -0,0 +1,88 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (c) 2023 Qualcomm Innovation Center, Inc. All rights reserved.
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/device.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pstore.h>
+#include <linux/slab.h>
+#include <soc/qcom/qcom_minidump.h>
+
+#include "qcom_ramoops_minidump.h"
+
+static LIST_HEAD(ramoops_region_list);
+
+struct md_region_list {
+	struct qcom_minidump_region md_region;
+	struct list_head list;
+};
+
+static int qcom_ramoops_region_register(struct device *dev, int type)
+{
+	struct qcom_minidump_region *md_region;
+	struct md_region_list *mdr_list;
+	struct pstore_record record;
+	unsigned int max_dump_cnt;
+	phys_addr_t phys;
+	const char *name;
+	void *virt;
+	size_t size;
+	int ret;
+
+	record.type = type;
+	record.id = 0;
+	max_dump_cnt = 0;
+	name = pstore_type_to_name(record.type);
+	do {
+		ret = pstore_region_defined(&record, &virt, &phys, &size, &max_dump_cnt);
+		if (ret < 0)
+			break;
+
+		mdr_list = devm_kzalloc(dev, sizeof(struct md_region_list), GFP_KERNEL);
+		if (!mdr_list)
+			return -ENOMEM;
+
+		md_region = &mdr_list->md_region;
+		scnprintf(md_region->name, sizeof(md_region->name) - 1, "K%s%llu", name, record.id);
+		md_region->virt_addr = virt;
+		md_region->phys_addr = phys;
+		md_region->size = size;
+		ret = qcom_minidump_region_register(md_region);
+		if (ret) {
+			pr_err("failed to register minidump region\n");
+			break;
+		}
+
+		list_add(&mdr_list->list, &ramoops_region_list);
+	} while (record.id < max_dump_cnt && ++record.id);
+
+	return ret;
+}
+
+void qcom_ramoops_minidump_register(struct device *dev)
+{
+	int type_arr[4] = { PSTORE_TYPE_DMESG, PSTORE_TYPE_CONSOLE,
+			    PSTORE_TYPE_FTRACE, PSTORE_TYPE_PMSG,
+			  };
+	int i;
+
+	for (i = 0; i < ARRAY_SIZE(type_arr); i++)
+		qcom_ramoops_region_register(dev, type_arr[i]);
+}
+
+void qcom_ramoops_minidump_unregister(void)
+{
+	struct md_region_list *mdr_list, *tmp;
+
+	list_for_each_entry_safe(mdr_list, tmp, &ramoops_region_list, list) {
+		struct qcom_minidump_region *region;
+
+		region = &mdr_list->md_region;
+		qcom_minidump_region_unregister(region);
+		list_del(&mdr_list->list);
+	}
+}
diff --git a/drivers/soc/qcom/qcom_ramoops_minidump.h b/drivers/soc/qcom/qcom_ramoops_minidump.h
new file mode 100644
index 000000000000..6086342cd398
--- /dev/null
+++ b/drivers/soc/qcom/qcom_ramoops_minidump.h
@@ -0,0 +1,10 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __QCOM_RAMOOPS_MINIDUMP_H__
+#define __QCOM_RAMOOPS_MINIDUMP_H__
+
+#include <linux/types.h>
+
+void qcom_ramoops_minidump_register(struct device *dev);
+void qcom_ramoops_minidump_unregister(void);
+
+#endif
-- 
2.7.4