linux-hardening - [Patch v6 12/12] soc: qcom: register ramoops region with APSS minidump

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Message-ID: <1700864395-1479-13-git-send-email-quic_mojha@quicinc.com>
Date: Sat, 25 Nov 2023 03:49:55 +0530
From: Mukesh Ojha <quic_mojha@...cinc.com>
To: <corbet@....net>, <agross@...nel.org>, <andersson@...nel.org>,
        <konrad.dybcio@...aro.org>, <robh+dt@...nel.org>,
        <krzysztof.kozlowski+dt@...aro.org>, <conor+dt@...nel.org>,
        <keescook@...omium.org>, <tony.luck@...el.com>, <gpiccoli@...lia.com>,
        <mathieu.poirier@...aro.org>, <vigneshr@...com>, <nm@...com>,
        <matthias.bgg@...il.com>, <kgene@...nel.org>,
        <alim.akhtar@...sung.com>, <bmasney@...hat.com>
CC: <linux-doc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-arm-msm@...r.kernel.org>, <linux-hardening@...r.kernel.org>,
        <linux-remoteproc@...r.kernel.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-mediatek@...ts.infradead.org>,
        <linux-samsung-soc@...r.kernel.org>, <kernel@...cinc.com>,
        Mukesh Ojha <quic_mojha@...cinc.com>
Subject: [Patch v6 12/12] soc: qcom: register ramoops region with APSS minidump

Register ramoops region with APSS minidump so that
these region gets captured on system crash.

Signed-off-by: Mukesh Ojha <quic_mojha@...cinc.com>
---
 drivers/soc/qcom/qcom_minidump.c | 62 ++++++++++++++++++++++++++++++++++++++++
 1 file changed, 62 insertions(+)

diff --git a/drivers/soc/qcom/qcom_minidump.c b/drivers/soc/qcom/qcom_minidump.c
index c0f76a51d0e8..9a39b68903fb 100644
--- a/drivers/soc/qcom/qcom_minidump.c
+++ b/drivers/soc/qcom/qcom_minidump.c
@@ -18,8 +18,10 @@
 #include <linux/mutex.h>
 #include <linux/platform_device.h>
 #include <linux/printk.h>
+#include <linux/pstore_ram.h>
 #include <linux/soc/qcom/smem.h>
 #include <linux/string.h>
+#include <linux/workqueue.h>
 #include <soc/qcom/qcom_minidump.h>
 
 #include "qcom_minidump_internal.h"
@@ -56,12 +58,20 @@ struct minidump_elfhdr {
  * @dev: Minidump backend device
  * @apss_data: APSS driver data
  * @md_lock: Lock to protect access to APSS minidump table
+ * @work: Minidump work for any required execution in process context.
  */
 struct minidump {
 	struct minidump_elfhdr	 elf;
 	struct device		 *dev;
 	struct minidump_ss_data	 *apss_data;
 	struct mutex		 md_lock;
+	struct work_struct	 work;
+};
+
+static LIST_HEAD(apss_md_rlist);
+struct md_region_list {
+	struct qcom_minidump_region md_region;
+	struct list_head list;
 };
 
 /*
@@ -530,6 +540,52 @@ static int qcom_apss_md_table_init(struct minidump *md,
 	return 0;
 }
 
+static int ramoops_region_md_register(const char *name, int id, void *vaddr,
+				      phys_addr_t paddr, size_t size)
+{
+	struct qcom_minidump_region *md_region;
+	struct md_region_list *mdr_list;
+	int ret;
+
+	mdr_list = kzalloc(sizeof(*mdr_list), GFP_KERNEL);
+	if (!mdr_list)
+		return -ENOMEM;
+
+	md_region = &mdr_list->md_region;
+	scnprintf(md_region->name, sizeof(md_region->name), "K%s%d", name, id);
+	md_region->virt_addr = vaddr;
+	md_region->phys_addr = paddr;
+	md_region->size = size;
+	ret = qcom_minidump_region_register(md_region);
+	if (ret < 0) {
+		pr_err("failed to register region in minidump: err: %d\n", ret);
+		return ret;
+	}
+
+	list_add(&mdr_list->list, &apss_md_rlist);
+
+	return 0;
+}
+
+static void ramoops_register_md_callback(struct work_struct *work)
+{
+	register_ramoops_ready_notifier(ramoops_region_md_register);
+}
+
+static void qcom_ramoops_minidump_unregister(void)
+{
+	struct md_region_list *mdr_list;
+	struct md_region_list *tmp;
+
+	list_for_each_entry_safe(mdr_list, tmp, &apss_md_rlist, list) {
+		struct qcom_minidump_region *region;
+
+		region = &mdr_list->md_region;
+		qcom_minidump_region_unregister(region);
+		list_del(&mdr_list->list);
+	}
+}
+
 static void qcom_apss_md_table_exit(struct minidump_ss_data *mdss_data)
 {
 	memset(mdss_data->md_ss_toc, cpu_to_le32(0), sizeof(*mdss_data->md_ss_toc));
@@ -575,6 +631,9 @@ static int qcom_apss_minidump_probe(struct platform_device *pdev)
 
 	platform_set_drvdata(pdev, md);
 
+	INIT_WORK(&md->work, ramoops_register_md_callback);
+	schedule_work(&md->work);
+
 	return ret;
 }
 
@@ -582,6 +641,9 @@ static void qcom_apss_minidump_remove(struct platform_device *pdev)
 {
 	struct minidump *md = platform_get_drvdata(pdev);
 
+	flush_work(&md->work);
+	qcom_ramoops_minidump_unregister();
+	unregister_ramoops_ready_notifier(ramoops_region_md_register);
 	qcom_apss_md_table_exit(md->apss_data);
 }
 
-- 
2.7.4