QEMU community requires additional PCI devices to simulate PVPANIC
devices so that some architectures can not occupy precious less than 4G
of memory space.
Previously, I added PCI driver directly to the original version of the driver,
which made the whole driver file look a bit cluttered. So Andy Shevchenko suggests:
"I would recommend to split it in a way how it's done for ChipIdea USB driver,
for example. (drivers/usb/chipidea if I'm not mistaken)".
v4 ---> v5 : Merge some patches to one for avoiding bisectability issues.
Make sure that just one pvpanic device is working.
v3 ---> v4 : add help text info in Konfig.
adjust structure definition position.
v2 ---> v3 : add change infomation.
v1 ---> v2 : add patch 0000 to descript the whole patch series.
modify text infomation.
modify "SPDX-License-Identifier: GPL-2.0-or-later"
to "SPDX-License-Identifier: GPL-2.0+"
Peng Hao (4):
misc/pvpanic: preparing for pvpanic driver framework
misc/pvpanic: Add pvpanic driver framework
misc/pvpanic: Avoid initializing multiple pvpanic devices
misc/pvpanic: add new pvpanic pci driver
drivers/misc/Kconfig | 9 +-
drivers/misc/Makefile | 2 +-
drivers/misc/pvpanic.c | 192 ------------------------------------
drivers/misc/pvpanic/Kconfig | 34 +++++++
drivers/misc/pvpanic/Makefile | 8 ++
drivers/misc/pvpanic/pvpanic-acpi.c | 77 +++++++++++++++
drivers/misc/pvpanic/pvpanic-of.c | 53 ++++++++++
drivers/misc/pvpanic/pvpanic-pci.c | 56 +++++++++++
drivers/misc/pvpanic/pvpanic.c | 140 ++++++++++++++++++++++++++
drivers/misc/pvpanic/pvpanic.h | 15 +++
10 files changed, 385 insertions(+), 201 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-acpi.c
create mode 100644 drivers/misc/pvpanic/pvpanic-of.c
create mode 100644 drivers/misc/pvpanic/pvpanic-pci.c
create mode 100644 drivers/misc/pvpanic/pvpanic.c
create mode 100644 drivers/misc/pvpanic/pvpanic.h
--
1.8.3.1
Add new pvpanic pci driver to pvpanic driver framework.
Signed-off-by: Peng Hao <[email protected]>
---
drivers/misc/pvpanic/Kconfig | 10 ++++++-
drivers/misc/pvpanic/Makefile | 1 +
drivers/misc/pvpanic/pvpanic-pci.c | 56 ++++++++++++++++++++++++++++++++++++++
3 files changed, 66 insertions(+), 1 deletion(-)
create mode 100644 drivers/misc/pvpanic/pvpanic-pci.c
diff --git a/drivers/misc/pvpanic/Kconfig b/drivers/misc/pvpanic/Kconfig
index 0c0c0b2..866cb37 100644
--- a/drivers/misc/pvpanic/Kconfig
+++ b/drivers/misc/pvpanic/Kconfig
@@ -1,6 +1,6 @@
config PVPANIC
tristate "pvpanic device support"
- depends on HAS_IOMEM && (ACPI || OF)
+ depends on HAS_IOMEM && (ACPI || OF || PCI)
help
This driver provides support for the pvpanic device. pvpanic is
a paravirtualized device provided by QEMU; it lets a virtual machine
@@ -23,4 +23,12 @@ config PVPANIC_OF
This driver is one specific driver for pvpanic driver framework.
It provides a mmio device as pvpanic device.
+config PVPANIC_PCI
+ tristate "pvpanic pci driver"
+ depends on PCI
+ default PVPANIC
+ help
+ This driver is one specific driver for pvpanic driver framework.
+ It provides a pci device as pvpanic device.
+
endif
diff --git a/drivers/misc/pvpanic/Makefile b/drivers/misc/pvpanic/Makefile
index 8819509..eb3e0ee 100644
--- a/drivers/misc/pvpanic/Makefile
+++ b/drivers/misc/pvpanic/Makefile
@@ -5,3 +5,4 @@
obj-$(CONFIG_PVPANIC) += pvpanic.o
obj-$(CONFIG_PVPANIC_ACPI) += pvpanic-acpi.o
obj-$(CONFIG_PVPANIC_OF) += pvpanic-of.o
+obj-$(CONFIG_PVPANIC_PCI) += pvpanic-pci.o
diff --git a/drivers/misc/pvpanic/pvpanic-pci.c b/drivers/misc/pvpanic/pvpanic-pci.c
new file mode 100644
index 0000000..1261710
--- /dev/null
+++ b/drivers/misc/pvpanic/pvpanic-pci.c
@@ -0,0 +1,56 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * pvpanic acpi driver.
+ *
+ * Copyright (C) 2019 ZTE Ltd.
+ * Author: Peng Hao <[email protected]>
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <linux/types.h>
+#include "pvpanic.h"
+
+#define PCI_VENDOR_ID_REDHAT 0x1b36
+#define PCI_DEVICE_ID_REDHAT_PVPANIC 0x0101
+
+static const struct pci_device_id pvpanic_pci_id_tbl[] = {
+ { PCI_DEVICE(PCI_VENDOR_ID_REDHAT, PCI_DEVICE_ID_REDHAT_PVPANIC),},
+ {}
+};
+
+static int pvpanic_pci_probe(struct pci_dev *pdev,
+ const struct pci_device_id *ent)
+{
+ int ret;
+ struct resource res;
+
+ ret = pcim_enable_device(pdev);
+ if (ret < 0)
+ return ret;
+
+ memset(&res, 0, sizeof(res));
+ res.start = pci_resource_start(pdev, 0);
+ res.end = pci_resource_end(pdev, 0);
+ res.flags = IORESOURCE_MEM;
+ ret = pvpanic_add_device(&pdev->dev, &res);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static void pvpanic_pci_remove(struct pci_dev *pdev)
+{
+ pvpanic_remove_device();
+}
+
+static struct pci_driver pvpanic_pci_driver = {
+ .name = "pvpanic-pci",
+ .id_table = pvpanic_pci_id_tbl,
+ .probe = pvpanic_pci_probe,
+ .remove = pvpanic_pci_remove,
+};
+
+module_pci_driver(pvpanic_pci_driver);
--
1.8.3.1
Avoid initializing multiple pvpanic devices when configure multiple
pvpanic device driver type. Make sure that only one pvpanic device
is working.
Signed-off-by: Peng Hao <[email protected]>
---
drivers/misc/pvpanic/pvpanic.c | 13 ++++++++++++-
1 file changed, 12 insertions(+), 1 deletion(-)
diff --git a/drivers/misc/pvpanic/pvpanic.c b/drivers/misc/pvpanic/pvpanic.c
index ccadec0..fbb5038 100644
--- a/drivers/misc/pvpanic/pvpanic.c
+++ b/drivers/misc/pvpanic/pvpanic.c
@@ -15,10 +15,13 @@
#include <linux/types.h>
static struct {
+ struct mutex lock;
struct platform_device *pdev;
void __iomem *base;
bool is_ioport;
-} pvpanic_data;
+} pvpanic_data = {
+ .lock = __MUTEX_INITIALIZER(pvpanic_data.lock),
+};
#define PVPANIC_PANICKED (1 << 0)
@@ -50,6 +53,12 @@ int pvpanic_add_device(struct device *dev, struct resource *res)
struct platform_device *pdev;
int ret;
+ mutex_lock(&pvpanic_data.lock);
+ if (pvpanic_data.pdev) {
+ mutex_unlock(&pvpanic_data.lock);
+ return -EEXIST;
+ }
+
pdev = platform_device_alloc("pvpanic", -1);
if (!pdev)
return -ENOMEM;
@@ -64,9 +73,11 @@ int pvpanic_add_device(struct device *dev, struct resource *res)
if (ret)
goto err;
pvpanic_data.pdev = pdev;
+ mutex_unlock(&pvpanic_data.lock);
return 0;
err:
+ mutex_unlock(&pvpanic_data.lock);
platform_device_put(pdev);
return ret;
}
--
1.8.3.1
Add pvpanic driver framework and split the original pvpanic acpi/of
driver as the two separate files and modify code to adapt the framework.
Signed-off-by: Peng Hao <[email protected]>
---
drivers/misc/pvpanic/Kconfig | 19 ++++
drivers/misc/pvpanic/Makefile | 2 +
drivers/misc/pvpanic/pvpanic-acpi.c | 77 +++++++++++++++
drivers/misc/pvpanic/pvpanic-of.c | 53 +++++++++++
drivers/misc/pvpanic/pvpanic.c | 181 ++++++++++++------------------------
drivers/misc/pvpanic/pvpanic.h | 15 +++
6 files changed, 225 insertions(+), 122 deletions(-)
create mode 100644 drivers/misc/pvpanic/pvpanic-acpi.c
create mode 100644 drivers/misc/pvpanic/pvpanic-of.c
create mode 100644 drivers/misc/pvpanic/pvpanic.h
diff --git a/drivers/misc/pvpanic/Kconfig b/drivers/misc/pvpanic/Kconfig
index 3e612c6..0c0c0b2 100644
--- a/drivers/misc/pvpanic/Kconfig
+++ b/drivers/misc/pvpanic/Kconfig
@@ -5,3 +5,22 @@ config PVPANIC
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.
+
+if PVPANIC
+
+config PVPANIC_ACPI
+ tristate "pvpanic acpi driver"
+ depends on ACPI
+ default PVPANIC
+ help
+ This driver is one specific driver for pvpanic driver framework.
+ It provides an acpi device as pvpanic device.
+
+config PVPANIC_OF
+ tristate "pvpanic mmio driver"
+ depends on OF
+ help
+ This driver is one specific driver for pvpanic driver framework.
+ It provides a mmio device as pvpanic device.
+
+endif
diff --git a/drivers/misc/pvpanic/Makefile b/drivers/misc/pvpanic/Makefile
index 6394224..8819509 100644
--- a/drivers/misc/pvpanic/Makefile
+++ b/drivers/misc/pvpanic/Makefile
@@ -3,3 +3,5 @@
# Copyright (c) 2018 ZTE Ltd.
obj-$(CONFIG_PVPANIC) += pvpanic.o
+obj-$(CONFIG_PVPANIC_ACPI) += pvpanic-acpi.o
+obj-$(CONFIG_PVPANIC_OF) += pvpanic-of.o
diff --git a/drivers/misc/pvpanic/pvpanic-acpi.c b/drivers/misc/pvpanic/pvpanic-acpi.c
new file mode 100644
index 0000000..8d10924
--- /dev/null
+++ b/drivers/misc/pvpanic/pvpanic-acpi.c
@@ -0,0 +1,77 @@
+// SPDX-License-Identifier: GPL-2.0+
+/*
+ * pvpanic acpi driver.
+ *
+ * Copyright (C) 2019 ZTE Ltd.
+ * Author: Peng Hao
+ */
+#include <linux/acpi.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include "pvpanic.h"
+
+static int pvpanic_add(struct acpi_device *device);
+static int pvpanic_remove(struct acpi_device *device);
+
+static const struct acpi_device_id pvpanic_device_ids[] = {
+ { "QEMU0001", 0 },
+ { "", 0 }
+};
+MODULE_DEVICE_TABLE(acpi, pvpanic_device_ids);
+
+static struct acpi_driver pvpanic_driver = {
+ .name = "pvpanic",
+ .class = "QEMU",
+ .ids = pvpanic_device_ids,
+ .ops = {
+ .add = pvpanic_add,
+ .remove = pvpanic_remove,
+ },
+ .owner = THIS_MODULE,
+};
+
+static acpi_status
+pvpanic_walk_resources(struct acpi_resource *res, void *context)
+{
+ struct resource r;
+ int ret = 0;
+ struct device *dev = context;
+
+ memset(&r, 0, sizeof(r));
+ if (acpi_dev_resource_io(res, &r) || acpi_dev_resource_memory(res, &r))
+ ret = pvpanic_add_device(dev, &r);
+
+ if (!ret)
+ return AE_OK;
+
+ return AE_ERROR;
+}
+static int pvpanic_add(struct acpi_device *device)
+{
+ int ret;
+ acpi_status status;
+
+ ret = acpi_bus_get_status(device);
+ if (ret < 0)
+ return ret;
+
+ if (!device->status.enabled || !device->status.functional)
+ return -ENODEV;
+
+ status = acpi_walk_resources(device->handle, METHOD_NAME__CRS,
+ pvpanic_walk_resources, &device->dev);
+
+ if (ACPI_FAILURE(status))
+ return -ENODEV;
+
+ return 0;
+}
+
+static int pvpanic_remove(struct acpi_device *device)
+{
+ pvpanic_remove_device();
+ return 0;
+}
+
+module_acpi_driver(pvpanic_driver);
diff --git a/drivers/misc/pvpanic/pvpanic-of.c b/drivers/misc/pvpanic/pvpanic-of.c
new file mode 100644
index 0000000..73ca5f3
--- /dev/null
+++ b/drivers/misc/pvpanic/pvpanic-of.c
@@ -0,0 +1,53 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
+/*
+ * pvpanic of driver.
+ *
+ * Copyright (C) 2019 ZTE Ltd.
+ * Author: Peng Hao <[email protected]>
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/platform_device.h>
+#include <linux/types.h>
+#include "pvpanic.h"
+
+static int pvpanic_mmio_probe(struct platform_device *pdev)
+{
+ struct resource *res;
+ int ret;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (!res)
+ return -EINVAL;
+
+ ret = pvpanic_add_device(&pdev->dev, res);
+ if (ret)
+ return -ENODEV;
+
+ return 0;
+}
+
+static int pvpanic_mmio_remove(struct platform_device *pdev)
+{
+ pvpanic_remove_device();
+ return 0;
+}
+
+static const struct of_device_id pvpanic_mmio_match[] = {
+ { .compatible = "qemu,pvpanic-mmio", },
+ {}
+};
+
+static struct platform_driver pvpanic_mmio_driver = {
+ .driver = {
+ .name = "pvpanic-mmio",
+ .of_match_table = pvpanic_mmio_match,
+ },
+ .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
index 595ac06..ccadec0 100644
--- a/drivers/misc/pvpanic/pvpanic.c
+++ b/drivers/misc/pvpanic/pvpanic.c
@@ -8,15 +8,17 @@
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
-#include <linux/acpi.h>
+#include <linux/io.h>
#include <linux/kernel.h>
#include <linux/module.h>
-#include <linux/of.h>
-#include <linux/of_address.h>
#include <linux/platform_device.h>
#include <linux/types.h>
-static void __iomem *base;
+static struct {
+ struct platform_device *pdev;
+ void __iomem *base;
+ bool is_ioport;
+} pvpanic_data;
#define PVPANIC_PANICKED (1 << 0)
@@ -27,7 +29,7 @@
static void
pvpanic_send_event(unsigned int event)
{
- iowrite8(event, base);
+ iowrite8(event, pvpanic_data.base);
}
static int
@@ -43,150 +45,85 @@
.priority = 1, /* let this called before broken drm_fb_helper */
};
-#ifdef CONFIG_ACPI
-static int pvpanic_add(struct acpi_device *device);
-static int pvpanic_remove(struct acpi_device *device);
-
-static const struct acpi_device_id pvpanic_device_ids[] = {
- { "QEMU0001", 0 },
- { "", 0 }
-};
-MODULE_DEVICE_TABLE(acpi, pvpanic_device_ids);
-
-static struct acpi_driver pvpanic_driver = {
- .name = "pvpanic",
- .class = "QEMU",
- .ids = pvpanic_device_ids,
- .ops = {
- .add = pvpanic_add,
- .remove = pvpanic_remove,
- },
- .owner = THIS_MODULE,
-};
-
-static acpi_status
-pvpanic_walk_resources(struct acpi_resource *res, void *context)
-{
- struct resource r;
-
- if (acpi_dev_resource_io(res, &r)) {
- base = ioport_map(r.start, resource_size(&r));
- return AE_OK;
- } else if (acpi_dev_resource_memory(res, &r)) {
- base = ioremap(r.start, resource_size(&r));
- return AE_OK;
- }
-
- return AE_ERROR;
-}
-
-static int pvpanic_add(struct acpi_device *device)
+int pvpanic_add_device(struct device *dev, struct resource *res)
{
+ struct platform_device *pdev;
int ret;
- ret = acpi_bus_get_status(device);
- if (ret < 0)
- return ret;
-
- if (!device->status.enabled || !device->status.functional)
- return -ENODEV;
+ pdev = platform_device_alloc("pvpanic", -1);
+ if (!pdev)
+ return -ENOMEM;
- acpi_walk_resources(device->handle, METHOD_NAME__CRS,
- pvpanic_walk_resources, NULL);
+ pdev->dev.parent = dev;
- if (!base)
- return -ENODEV;
+ ret = platform_device_add_resources(pdev, res, 1);
+ if (ret)
+ goto err;
- atomic_notifier_chain_register(&panic_notifier_list,
- &pvpanic_panic_nb);
-
- return 0;
-}
-
-static int pvpanic_remove(struct acpi_device *device)
-{
-
- atomic_notifier_chain_unregister(&panic_notifier_list,
- &pvpanic_panic_nb);
- iounmap(base);
+ ret = platform_device_add(pdev);
+ if (ret)
+ goto err;
+ pvpanic_data.pdev = pdev;
return 0;
+err:
+ platform_device_put(pdev);
+ return ret;
}
+EXPORT_SYMBOL_GPL(pvpanic_add_device);
-static int pvpanic_register_acpi_driver(void)
+void pvpanic_remove_device(void)
{
- return acpi_bus_register_driver(&pvpanic_driver);
+ platform_device_unregister(pvpanic_data.pdev);
+ pvpanic_data.pdev = NULL;
}
+EXPORT_SYMBOL_GPL(pvpanic_remove_device);
-static void pvpanic_unregister_acpi_driver(void)
+static int pvpanic_platform_probe(struct platform_device *pdev)
{
- acpi_bus_unregister_driver(&pvpanic_driver);
-}
-#else
-static int pvpanic_register_acpi_driver(void)
-{
- return -ENODEV;
-}
-
-static void pvpanic_unregister_acpi_driver(void) {}
-#endif
-
-static int pvpanic_mmio_probe(struct platform_device *pdev)
-{
- struct resource *mem;
-
- mem = platform_get_resource(pdev, IORESOURCE_MEM, 0);
- if (!mem)
- return -EINVAL;
-
- base = devm_ioremap_resource(&pdev->dev, mem);
- if (IS_ERR(base))
- return PTR_ERR(base);
-
+ struct device *dev = &pdev->dev;
+ struct resource *res;
+ void __iomem *base;
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ if (res) {
+ base = devm_ioremap_resource(dev, res);
+ if (IS_ERR(base))
+ return -ENODEV;
+ } else {
+ res = platform_get_resource(pdev, IORESOURCE_IO, 0);
+ if (!res)
+ return -ENODEV;
+
+ base = ioport_map(res->start, resource_size(res));
+ if (!base)
+ return -ENODEV;
+ pvpanic_data.is_ioport = true;
+ }
+
+ pvpanic_data.base = base;
atomic_notifier_chain_register(&panic_notifier_list,
&pvpanic_panic_nb);
return 0;
}
-static int pvpanic_mmio_remove(struct platform_device *pdev)
+static int pvpanic_platform_remove(struct platform_device *pdev)
{
-
atomic_notifier_chain_unregister(&panic_notifier_list,
&pvpanic_panic_nb);
+ if (pvpanic_data.is_ioport)
+ iounmap(pvpanic_data.base);
return 0;
}
-static const struct of_device_id pvpanic_mmio_match[] = {
- { .compatible = "qemu,pvpanic-mmio", },
- {}
-};
-
-static struct platform_driver pvpanic_mmio_driver = {
+static struct platform_driver pvpanic_driver = {
+ .probe = pvpanic_platform_probe,
+ .remove = pvpanic_platform_remove,
.driver = {
- .name = "pvpanic-mmio",
- .of_match_table = pvpanic_mmio_match,
- },
- .probe = pvpanic_mmio_probe,
- .remove = pvpanic_mmio_remove,
+ .name = "pvpanic",
+ }
};
-static int __init pvpanic_mmio_init(void)
-{
- if (acpi_disabled)
- return platform_driver_register(&pvpanic_mmio_driver);
- else
- return pvpanic_register_acpi_driver();
-}
-
-static void __exit pvpanic_mmio_exit(void)
-{
- if (acpi_disabled)
- platform_driver_unregister(&pvpanic_mmio_driver);
- else
- pvpanic_unregister_acpi_driver();
-}
-
-module_init(pvpanic_mmio_init);
-module_exit(pvpanic_mmio_exit);
+module_platform_driver(pvpanic_driver);
diff --git a/drivers/misc/pvpanic/pvpanic.h b/drivers/misc/pvpanic/pvpanic.h
new file mode 100644
index 0000000..7fb6bb2
--- /dev/null
+++ b/drivers/misc/pvpanic/pvpanic.h
@@ -0,0 +1,15 @@
+// SPDX-License-Identifier: GPL-2.0+
+/* pvpanic driver framework header file
+ *
+ * Copyright (C) 2019 ZTE Ltd.
+ *
+ * Author: Peng Hao <[email protected]>
+ */
+
+#ifndef __DRIVERS_MISC_PVPANIC_H
+#define __DRIVERS_MISC_PVPANIC_H
+
+extern int pvpanic_add_device(struct device *dev, struct resource *res);
+extern void pvpanic_remove_device(void);
+
+#endif
--
1.8.3.1
Preparing for pvpanic driver framework. Create a pvpanic driver
directory and move current driver file to new directory.
Signed-off-by: Peng Hao <[email protected]>
---
drivers/misc/Kconfig | 9 +--------
drivers/misc/Makefile | 2 +-
drivers/misc/pvpanic/Kconfig | 7 +++++++
drivers/misc/pvpanic/Makefile | 5 +++++
drivers/misc/{ => pvpanic}/pvpanic.c | 0
5 files changed, 14 insertions(+), 9 deletions(-)
create mode 100644 drivers/misc/pvpanic/Kconfig
create mode 100644 drivers/misc/pvpanic/Makefile
rename drivers/misc/{ => pvpanic}/pvpanic.c (100%)
diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index f417b06..aa3a805 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -513,14 +513,7 @@ 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.
-
+source "drivers/misc/pvpanic/Kconfig"
source "drivers/misc/c2port/Kconfig"
source "drivers/misc/eeprom/Kconfig"
source "drivers/misc/cb710/Kconfig"
diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
index e39ccbb..cfe20b3 100644
--- a/drivers/misc/Makefile
+++ b/drivers/misc/Makefile
@@ -58,4 +58,4 @@ obj-$(CONFIG_ASPEED_LPC_SNOOP) += aspeed-lpc-snoop.o
obj-$(CONFIG_PCI_ENDPOINT_TEST) += pci_endpoint_test.o
obj-$(CONFIG_OCXL) += ocxl/
obj-y += cardreader/
-obj-$(CONFIG_PVPANIC) += pvpanic.o
+obj-$(CONFIG_PVPANIC) += pvpanic/
diff --git a/drivers/misc/pvpanic/Kconfig b/drivers/misc/pvpanic/Kconfig
new file mode 100644
index 0000000..3e612c6
--- /dev/null
+++ b/drivers/misc/pvpanic/Kconfig
@@ -0,0 +1,7 @@
+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.
diff --git a/drivers/misc/pvpanic/Makefile b/drivers/misc/pvpanic/Makefile
new file mode 100644
index 0000000..6394224
--- /dev/null
+++ b/drivers/misc/pvpanic/Makefile
@@ -0,0 +1,5 @@
+# SPDX-License-Identifier: GPL-2.0
+#
+# Copyright (c) 2018 ZTE Ltd.
+
+obj-$(CONFIG_PVPANIC) += pvpanic.o
diff --git a/drivers/misc/pvpanic.c b/drivers/misc/pvpanic/pvpanic.c
similarity index 100%
rename from drivers/misc/pvpanic.c
rename to drivers/misc/pvpanic/pvpanic.c
--
1.8.3.1
On Sat, Feb 16, 2019 at 10:29 AM Peng Hao <[email protected]> wrote:
>
> Preparing for pvpanic driver framework. Create a pvpanic driver
> directory and move current driver file to new directory.
>
Reviewed-by: Andy Shevchenko <[email protected]>
> Signed-off-by: Peng Hao <[email protected]>
> ---
> drivers/misc/Kconfig | 9 +--------
> drivers/misc/Makefile | 2 +-
> drivers/misc/pvpanic/Kconfig | 7 +++++++
> drivers/misc/pvpanic/Makefile | 5 +++++
> drivers/misc/{ => pvpanic}/pvpanic.c | 0
> 5 files changed, 14 insertions(+), 9 deletions(-)
> create mode 100644 drivers/misc/pvpanic/Kconfig
> create mode 100644 drivers/misc/pvpanic/Makefile
> rename drivers/misc/{ => pvpanic}/pvpanic.c (100%)
>
> diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
> index f417b06..aa3a805 100644
> --- a/drivers/misc/Kconfig
> +++ b/drivers/misc/Kconfig
> @@ -513,14 +513,7 @@ config MISC_RTSX
> tristate
> default MISC_RTSX_PCI || MISC_RTSX_USB
>
> -config PVPANIC
> - tristate "pvpanic device support"
> - depends on HAS_IOMEM && (ACPI || OF)
> - help
> - This driver provides support for the pvpanic device. pvpanic is
> - a paravirtualized device provided by QEMU; it lets a virtual machine
> - (guest) communicate panic events to the host.
> -
> +source "drivers/misc/pvpanic/Kconfig"
> source "drivers/misc/c2port/Kconfig"
> source "drivers/misc/eeprom/Kconfig"
> source "drivers/misc/cb710/Kconfig"
> diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
> index e39ccbb..cfe20b3 100644
> --- a/drivers/misc/Makefile
> +++ b/drivers/misc/Makefile
> @@ -58,4 +58,4 @@ obj-$(CONFIG_ASPEED_LPC_SNOOP) += aspeed-lpc-snoop.o
> obj-$(CONFIG_PCI_ENDPOINT_TEST) += pci_endpoint_test.o
> obj-$(CONFIG_OCXL) += ocxl/
> obj-y += cardreader/
> -obj-$(CONFIG_PVPANIC) += pvpanic.o
> +obj-$(CONFIG_PVPANIC) += pvpanic/
> diff --git a/drivers/misc/pvpanic/Kconfig b/drivers/misc/pvpanic/Kconfig
> new file mode 100644
> index 0000000..3e612c6
> --- /dev/null
> +++ b/drivers/misc/pvpanic/Kconfig
> @@ -0,0 +1,7 @@
> +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.
> diff --git a/drivers/misc/pvpanic/Makefile b/drivers/misc/pvpanic/Makefile
> new file mode 100644
> index 0000000..6394224
> --- /dev/null
> +++ b/drivers/misc/pvpanic/Makefile
> @@ -0,0 +1,5 @@
> +# SPDX-License-Identifier: GPL-2.0
> +#
> +# Copyright (c) 2018 ZTE Ltd.
> +
> +obj-$(CONFIG_PVPANIC) += pvpanic.o
> diff --git a/drivers/misc/pvpanic.c b/drivers/misc/pvpanic/pvpanic.c
> similarity index 100%
> rename from drivers/misc/pvpanic.c
> rename to drivers/misc/pvpanic/pvpanic.c
> --
> 1.8.3.1
>
--
With Best Regards,
Andy Shevchenko
On Sat, Feb 16, 2019 at 10:29 AM Peng Hao <[email protected]> wrote:
>
> Avoid initializing multiple pvpanic devices when configure multiple
> pvpanic device driver type. Make sure that only one pvpanic device
> is working.
>
> Signed-off-by: Peng Hao <[email protected]>
> ---
> drivers/misc/pvpanic/pvpanic.c | 13 ++++++++++++-
> 1 file changed, 12 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/misc/pvpanic/pvpanic.c b/drivers/misc/pvpanic/pvpanic.c
> index ccadec0..fbb5038 100644
> --- a/drivers/misc/pvpanic/pvpanic.c
> +++ b/drivers/misc/pvpanic/pvpanic.c
> @@ -15,10 +15,13 @@
> #include <linux/types.h>
>
> static struct {
> + struct mutex lock;
> struct platform_device *pdev;
> void __iomem *base;
> bool is_ioport;
> -} pvpanic_data;
> +} pvpanic_data = {
> + .lock = __MUTEX_INITIALIZER(pvpanic_data.lock),
> +};
>
> #define PVPANIC_PANICKED (1 << 0)
>
> @@ -50,6 +53,12 @@ int pvpanic_add_device(struct device *dev, struct resource *res)
> struct platform_device *pdev;
> int ret;
>
> + mutex_lock(&pvpanic_data.lock);
> + if (pvpanic_data.pdev) {
> + mutex_unlock(&pvpanic_data.lock);
> + return -EEXIST;
> + }
> +
> pdev = platform_device_alloc("pvpanic", -1);
> if (!pdev)
> return -ENOMEM;
> @@ -64,9 +73,11 @@ int pvpanic_add_device(struct device *dev, struct resource *res)
> if (ret)
> goto err;
> pvpanic_data.pdev = pdev;
OK, mutex basically protects pdev member in pvpanic_data. What about
->remove() stage?
> + mutex_unlock(&pvpanic_data.lock);
>
> return 0;
> err:
> + mutex_unlock(&pvpanic_data.lock);
> platform_device_put(pdev);
> return ret;
> }
> --
> 1.8.3.1
>
--
With Best Regards,
Andy Shevchenko