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From:   Mihai Carabas <mihai.carabas@oracle.com>
To:     linux-kernel@vger.kernel.org
Cc:     gregkh@linuxfoundation.org, arnd@arndb.de,
        bobo.shaobowang@huawei.com, rdunlap@infradead.org,
        Mihai Carabas <mihai.carabas@oracle.com>
Subject: [PATCH v7 1/3] misc/pvpanic: split-up generic and platform dependent code
Date:   Tue, 23 Mar 2021 15:59:36 +0200
Message-Id: <1616507978-15661-2-git-send-email-mihai.carabas@oracle.com>
In-Reply-To: <1616507978-15661-1-git-send-email-mihai.carabas@oracle.com>
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Split-up generic and platform dependent code in order to be able to re-use
generic event handling code in pvpanic PCI device driver in the next patches.

The code from pvpanic.c was split in two new files:
- pvpanic.c: generic code that handles pvpanic events
- pvpanic-mmio.c: platform/bus dependent code

Signed-off-by: Mihai Carabas <mihai.carabas@oracle.com>
---
 drivers/misc/Kconfig                |   9 +-
 drivers/misc/Makefile               |   2 +-
 drivers/misc/pvpanic.c              | 161 ------------------------------------
 drivers/misc/pvpanic/Kconfig        |  19 +++++
 drivers/misc/pvpanic/Makefile       |   7 ++
 drivers/misc/pvpanic/pvpanic-mmio.c | 135 ++++++++++++++++++++++++++++++
 drivers/misc/pvpanic/pvpanic.c      |  77 +++++++++++++++++
 drivers/misc/pvpanic/pvpanic.h      |  15 ++++
 8 files changed, 255 insertions(+), 170 deletions(-)
 delete mode 100644 drivers/misc/pvpanic.c
 create mode 100644 drivers/misc/pvpanic/Kconfig
 create mode 100644 drivers/misc/pvpanic/Makefile
 create mode 100644 drivers/misc/pvpanic/pvpanic-mmio.c
 create mode 100644 drivers/misc/pvpanic/pvpanic.c
 create mode 100644 drivers/misc/pvpanic/pvpanic.h

diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index f532c59..c5f20e9 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -427,14 +427,6 @@ config MISC_RTSX
 	tristate
 	default MISC_RTSX_PCI || MISC_RTSX_USB
 
-config PVPANIC
-	tristate "pvpanic device support"
-	depends on HAS_IOMEM && (ACPI || OF)
-	help
-	  This driver provides support for the pvpanic device.  pvpanic is
-	  a paravirtualized device provided by QEMU; it lets a virtual machine
-	  (guest) communicate panic events to the host.
-
 config HISI_HIKEY_USB
 	tristate "USB GPIO Hub on HiSilicon Hikey 960/970 Platform"
 	depends on (OF && GPIOLIB) || COMPILE_TEST
@@ -461,4 +453,5 @@ source "drivers/misc/bcm-vk/Kconfig"
 source "drivers/misc/cardreader/Kconfig"
 source "drivers/misc/habanalabs/Kconfig"
 source "drivers/misc/uacce/Kconfig"
+source "drivers/misc/pvpanic/Kconfig"
 endmenu
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
index 99b6f15..fd5f87e 100644
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -51,7 +51,7 @@ obj-$(CONFIG_PCI_ENDPOINT_TEST)	+= pci_endpoint_test.o
 obj-$(CONFIG_OCXL)		+= ocxl/
 obj-$(CONFIG_BCM_VK)		+= bcm-vk/
 obj-y				+= cardreader/
-obj-$(CONFIG_PVPANIC)   	+= pvpanic.o
+obj-$(CONFIG_PVPANIC)   	+= pvpanic/
 obj-$(CONFIG_HABANA_AI)		+= habanalabs/
 obj-$(CONFIG_UACCE)		+= uacce/
 obj-$(CONFIG_XILINX_SDFEC)	+= xilinx_sdfec.o
diff --git a/drivers/misc/pvpanic.c b/drivers/misc/pvpanic.c
deleted file mode 100644
index f1655f5..00000000
--- a/drivers/misc/pvpanic.c
+++ /dev/null
@@ -1,161 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0+
-/*
- *  Pvpanic Device Support
- *
- *  Copyright (C) 2013 Fujitsu.
- *  Copyright (C) 2018 ZTE.
- */
-
-#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-
-#include <linux/io.h>
-#include <linux/kernel.h>
-#include <linux/kexec.h>
-#include <linux/mod_devicetable.h>
-#include <linux/module.h>
-#include <linux/platform_device.h>
-#include <linux/types.h>
-
-#include <uapi/misc/pvpanic.h>
-
-static void __iomem *base;
-static unsigned int capability = PVPANIC_PANICKED | PVPANIC_CRASH_LOADED;
-static unsigned int events;
-
-static ssize_t capability_show(struct device *dev,
-			       struct device_attribute *attr, char *buf)
-{
-	return sysfs_emit(buf, "%x\n", capability);
-}
-static DEVICE_ATTR_RO(capability);
-
-static ssize_t events_show(struct device *dev,  struct device_attribute *attr, char *buf)
-{
-	return sysfs_emit(buf, "%x\n", events);
-}
-
-static ssize_t events_store(struct device *dev,  struct device_attribute *attr,
-			    const char *buf, size_t count)
-{
-	unsigned int tmp;
-	int err;
-
-	err = kstrtouint(buf, 16, &tmp);
-	if (err)
-		return err;
-
-	if ((tmp & capability) != tmp)
-		return -EINVAL;
-
-	events = tmp;
-
-	return count;
-
-}
-static DEVICE_ATTR_RW(events);
-
-static struct attribute *pvpanic_dev_attrs[] = {
-	&dev_attr_capability.attr,
-	&dev_attr_events.attr,
-	NULL
-};
-ATTRIBUTE_GROUPS(pvpanic_dev);
-
-MODULE_AUTHOR("Hu Tao <hutao@cn.fujitsu.com>");
-MODULE_DESCRIPTION("pvpanic device driver");
-MODULE_LICENSE("GPL");
-
-static void
-pvpanic_send_event(unsigned int event)
-{
-	if (event & capability & events)
-		iowrite8(event, base);
-}
-
-static int
-pvpanic_panic_notify(struct notifier_block *nb, unsigned long code,
-		     void *unused)
-{
-	unsigned int event = PVPANIC_PANICKED;
-
-	if (kexec_crash_loaded())
-		event = PVPANIC_CRASH_LOADED;
-
-	pvpanic_send_event(event);
-
-	return NOTIFY_DONE;
-}
-
-static struct notifier_block pvpanic_panic_nb = {
-	.notifier_call = pvpanic_panic_notify,
-	.priority = 1, /* let this called before broken drm_fb_helper */
-};
-
-static int pvpanic_mmio_probe(struct platform_device *pdev)
-{
-	struct device *dev = &pdev->dev;
-	struct resource *res;
-
-	res = platform_get_mem_or_io(pdev, 0);
-	if (!res)
-		return -EINVAL;
-
-	switch (resource_type(res)) {
-	case IORESOURCE_IO:
-		base = devm_ioport_map(dev, res->start, resource_size(res));
-		if (!base)
-			return -ENOMEM;
-		break;
-	case IORESOURCE_MEM:
-		base = devm_ioremap_resource(dev, res);
-		if (IS_ERR(base))
-			return PTR_ERR(base);
-		break;
-	default:
-		return -EINVAL;
-	}
-
-	/* initlize capability by RDPT */
-	capability &= ioread8(base);
-	events = capability;
-
-	if (capability)
-		atomic_notifier_chain_register(&panic_notifier_list,
-					       &pvpanic_panic_nb);
-
-	return 0;
-}
-
-static int pvpanic_mmio_remove(struct platform_device *pdev)
-{
-
-	if (capability)
-		atomic_notifier_chain_unregister(&panic_notifier_list,
-						 &pvpanic_panic_nb);
-
-	return 0;
-}
-
-static const struct of_device_id pvpanic_mmio_match[] = {
-	{ .compatible = "qemu,pvpanic-mmio", },
-	{}
-};
-MODULE_DEVICE_TABLE(of, pvpanic_mmio_match);
-
-static const struct acpi_device_id pvpanic_device_ids[] = {
-	{ "QEMU0001", 0 },
-	{ "", 0 }
-};
-MODULE_DEVICE_TABLE(acpi, pvpanic_device_ids);
-
-static struct platform_driver pvpanic_mmio_driver = {
-	.driver = {
-		.name = "pvpanic-mmio",
-		.of_match_table = pvpanic_mmio_match,
-		.acpi_match_table = pvpanic_device_ids,
-		.dev_groups = pvpanic_dev_groups,
-	},
-	.probe = pvpanic_mmio_probe,
-	.remove = pvpanic_mmio_remove,
-};
-module_platform_driver(pvpanic_mmio_driver);
diff --git a/drivers/misc/pvpanic/Kconfig b/drivers/misc/pvpanic/Kconfig
new file mode 100644
index 00000000..454f1ee
--- /dev/null
+++ b/drivers/misc/pvpanic/Kconfig
@@ -0,0 +1,19 @@
+# SPDX-License-Identifier: GPL-2.0+
+#
+# Pvpanic Kconfig
+#
+# Copyright (C) 2021 Oracle.
+#
+
+config PVPANIC
+	bool "pvpanic device support"
+	help
+	  This option allows to select a specific pvpanic device driver.
+	  pvpanic is a paravirtualized device provided by QEMU; it lets
+	  a virtual machine (guest) communicate panic events to the host.
+
+config PVPANIC_MMIO
+	tristate "pvpanic MMIO device support"
+	depends on HAS_IOMEM && (ACPI || OF) && PVPANIC
+	help
+	  This driver provides support for the MMIO pvpanic device.
diff --git a/drivers/misc/pvpanic/Makefile b/drivers/misc/pvpanic/Makefile
new file mode 100644
index 00000000..e12a2dc
--- /dev/null
+++ b/drivers/misc/pvpanic/Makefile
@@ -0,0 +1,7 @@
+# SPDX-License-Identifier: GPL-2.0+
+#
+# Pvpanic Makefile
+#
+# Copyright (C) 2021 Oracle.
+#
+obj-$(CONFIG_PVPANIC_MMIO)	+= pvpanic.o pvpanic-mmio.o
diff --git a/drivers/misc/pvpanic/pvpanic-mmio.c b/drivers/misc/pvpanic/pvpanic-mmio.c
new file mode 100644
index 00000000..4cb6f0f
--- /dev/null
+++ b/drivers/misc/pvpanic/pvpanic-mmio.c
@@ -0,0 +1,135 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ *  Pvpanic MMIO Device Support
+ *
+ *  Copyright (C) 2013 Fujitsu.
+ *  Copyright (C) 2018 ZTE.
+ *  Copyright (C) 2021 Oracle.
+ */
+
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/kexec.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/types.h>
+
+#include <uapi/misc/pvpanic.h>
+
+#include "pvpanic.h"
+
+MODULE_AUTHOR("Hu Tao <hutao@cn.fujitsu.com>");
+MODULE_DESCRIPTION("pvpanic device driver");
+MODULE_LICENSE("GPL");
+
+static void __iomem *base;
+static unsigned int capability = PVPANIC_PANICKED | PVPANIC_CRASH_LOADED;
+static unsigned int events;
+
+static ssize_t capability_show(struct device *dev,
+			       struct device_attribute *attr, char *buf)
+{
+	return sysfs_emit(buf, "%x\n", capability);
+}
+static DEVICE_ATTR_RO(capability);
+
+static ssize_t events_show(struct device *dev,  struct device_attribute *attr, char *buf)
+{
+	return sysfs_emit(buf, "%x\n", events);
+}
+
+static ssize_t events_store(struct device *dev,  struct device_attribute *attr,
+			    const char *buf, size_t count)
+{
+	unsigned int tmp;
+	int err;
+
+	err = kstrtouint(buf, 16, &tmp);
+	if (err)
+		return err;
+
+	if ((tmp & capability) != tmp)
+		return -EINVAL;
+
+	events = tmp;
+
+	pvpanic_set_events(events);
+
+	return count;
+
+}
+static DEVICE_ATTR_RW(events);
+
+static struct attribute *pvpanic_mmio_dev_attrs[] = {
+	&dev_attr_capability.attr,
+	&dev_attr_events.attr,
+	NULL
+};
+ATTRIBUTE_GROUPS(pvpanic_mmio_dev);
+
+static int pvpanic_mmio_probe(struct platform_device *pdev)
+{
+	struct device *dev = &pdev->dev;
+	struct resource *res;
+	void __iomem *base;
+
+	res = platform_get_mem_or_io(pdev, 0);
+	if (!res)
+		return -EINVAL;
+
+	switch (resource_type(res)) {
+	case IORESOURCE_IO:
+		base = devm_ioport_map(dev, res->start, resource_size(res));
+		if (!base)
+			return -ENOMEM;
+		break;
+	case IORESOURCE_MEM:
+		base = devm_ioremap_resource(dev, res);
+		if (IS_ERR(base))
+			return PTR_ERR(base);
+		break;
+	default:
+		return -EINVAL;
+	}
+
+	/* initlize capability by RDPT */
+	capability &= ioread8(base);
+	events = capability;
+
+	pvpanic_probe(base, capability);
+
+	return 0;
+}
+
+static int pvpanic_mmio_remove(struct platform_device *pdev)
+{
+
+	pvpanic_remove();
+
+	return 0;
+}
+
+static const struct of_device_id pvpanic_mmio_match[] = {
+	{ .compatible = "qemu,pvpanic-mmio", },
+	{}
+};
+MODULE_DEVICE_TABLE(of, pvpanic_mmio_match);
+
+static const struct acpi_device_id pvpanic_device_ids[] = {
+	{ "QEMU0001", 0 },
+	{ "", 0 }
+};
+MODULE_DEVICE_TABLE(acpi, pvpanic_device_ids);
+
+static struct platform_driver pvpanic_mmio_driver = {
+	.driver = {
+		.name = "pvpanic-mmio",
+		.of_match_table = pvpanic_mmio_match,
+		.acpi_match_table = pvpanic_device_ids,
+		.dev_groups = pvpanic_mmio_dev_groups,
+	},
+	.probe = pvpanic_mmio_probe,
+	.remove = pvpanic_mmio_remove,
+};
+module_platform_driver(pvpanic_mmio_driver);
diff --git a/drivers/misc/pvpanic/pvpanic.c b/drivers/misc/pvpanic/pvpanic.c
new file mode 100644
index 00000000..11d029c
--- /dev/null
+++ b/drivers/misc/pvpanic/pvpanic.c
@@ -0,0 +1,77 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ *  Pvpanic Device Support
+ *
+ *  Copyright (C) 2013 Fujitsu.
+ *  Copyright (C) 2018 ZTE.
+ *  Copyright (C) 2021 Oracle.
+ */
+
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/kexec.h>
+#include <linux/mod_devicetable.h>
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/types.h>
+
+#include <uapi/misc/pvpanic.h>
+
+#include "pvpanic.h"
+
+static void __iomem *base;
+static unsigned int capability;
+static unsigned int events;
+
+static void
+pvpanic_send_event(unsigned int event)
+{
+	if (event & capability & events)
+		iowrite8(event, base);
+}
+
+static int
+pvpanic_panic_notify(struct notifier_block *nb, unsigned long code,
+		     void *unused)
+{
+	unsigned int event = PVPANIC_PANICKED;
+
+	if (kexec_crash_loaded())
+		event = PVPANIC_CRASH_LOADED;
+
+	pvpanic_send_event(event);
+
+	return NOTIFY_DONE;
+}
+
+static struct notifier_block pvpanic_panic_nb = {
+	.notifier_call = pvpanic_panic_notify,
+	.priority = 1, /* let this called before broken drm_fb_helper */
+};
+
+void pvpanic_probe(void __iomem *pbase, unsigned int dev_cap)
+{
+	base = pbase;
+	capability = dev_cap;
+	events = capability;
+
+	if (capability)
+		atomic_notifier_chain_register(&panic_notifier_list,
+					       &pvpanic_panic_nb);
+}
+EXPORT_SYMBOL_GPL(pvpanic_probe);
+
+void pvpanic_remove(void)
+{
+	if (capability)
+		atomic_notifier_chain_unregister(&panic_notifier_list,
+						 &pvpanic_panic_nb);
+	base = NULL;
+}
+EXPORT_SYMBOL_GPL(pvpanic_remove);
+
+void pvpanic_set_events(unsigned int dev_events)
+{
+	events = dev_events;
+}
+EXPORT_SYMBOL_GPL(pvpanic_set_events);
diff --git a/drivers/misc/pvpanic/pvpanic.h b/drivers/misc/pvpanic/pvpanic.h
new file mode 100644
index 00000000..3abe15f
--- /dev/null
+++ b/drivers/misc/pvpanic/pvpanic.h
@@ -0,0 +1,15 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ *  Pvpanic Device Support
+ *
+ *  Copyright (C) 2021 Oracle.
+ */
+
+#ifndef PVPANIC_H_
+#define PVPANIC_H_
+
+void pvpanic_probe(void __iomem *base, unsigned int dev_cap);
+void pvpanic_remove(void);
+void pvpanic_set_events(unsigned int dev_events);
+
+#endif /* PVPANIC_H_ */
-- 
1.8.3.1