[PATCH V2 1/3] misc/pvpanic: return 0 for empty body register function

[PATCH V2 1/3] misc/pvpanic: return 0 for empty body register function

[Peng Hao]

Return 0 for empty body register function normally.

Signed-off-by: Peng Hao <peng.hao2@zte.com.cn>
---
 drivers/misc/pvpanic.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/misc/pvpanic.c b/drivers/misc/pvpanic.c
index 3150dc2..f84ed30 100644
--- a/drivers/misc/pvpanic.c
+++ b/drivers/misc/pvpanic.c
@@ -125,7 +125,7 @@ static void pvpanic_unregister_acpi_driver(void)
 #else
 static int pvpanic_register_acpi_driver(void)
 {
-	return -ENODEV;
+	return 0;
 }
 
 static void pvpanic_unregister_acpi_driver(void) {}
-- 
1.8.3.1

[PATCH V2 2/3] misc/pvpanic : add pci interface for pvpanic

[Peng Hao]

Support pvpanic as a pci device in guest kernel.

Signed-off-by: Peng Hao <peng.hao2@zte.com.cn>
---
 drivers/misc/pvpanic.c | 82 ++++++++++++++++++++++++++++++++++++++++++++++++--
 1 file changed, 80 insertions(+), 2 deletions(-)

diff --git a/drivers/misc/pvpanic.c b/drivers/misc/pvpanic.c
index f84ed30..b8d8dba 100644
--- a/drivers/misc/pvpanic.c
+++ b/drivers/misc/pvpanic.c
@@ -13,11 +13,14 @@
 #include <linux/module.h>
 #include <linux/of.h>
 #include <linux/of_address.h>
+#include <linux/pci.h>
 #include <linux/platform_device.h>
 #include <linux/types.h>
 
 static void __iomem *base;
 
+#define PCI_VENDOR_ID_REDHAT             0x1b36
+#define PCI_DEVICE_ID_REDHAT_PVPANIC     0x0101
 #define PVPANIC_PANICKED        (1 << 0)
 
 MODULE_AUTHOR("Hu Tao <hutao@cn.fujitsu.com>");
@@ -172,12 +175,86 @@ static int pvpanic_mmio_remove(struct platform_device *pdev)
 	.remove = pvpanic_mmio_remove,
 };
 
+#ifdef CONFIG_PCI
+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 err;
+
+	err = pci_enable_device(pdev);
+	if (err)
+		return err;
+	if (pci_request_region(pdev, 0, "pvpanic-pci"))
+		goto disable;
+
+	base = pci_ioremap_bar(pdev, 0);
+	if (!base)
+		goto release;
+
+	atomic_notifier_chain_register(&panic_notifier_list,
+				       &pvpanic_panic_nb);
+	return 0;
+
+release:
+	pci_release_region(pdev, 0);
+disable:
+	pci_disable_device(pdev);
+
+	return -ENODEV;
+}
+
+static void pvpanic_pci_remove(struct pci_dev *pdev)
+{
+	atomic_notifier_chain_unregister(&panic_notifier_list,
+					 &pvpanic_panic_nb);
+	iounmap(base);
+	pci_release_region(pdev, 0);
+	pci_disable_device(pdev);
+}
+
+static struct pci_driver pvpanic_pci_driver = {
+	.name =         "pvpanic-pci",
+	.id_table =     pvpanic_pci_id_tbl,
+	.probe =        pvpanic_pci_probe,
+	.remove =       pvpanic_pci_remove,
+};
+
+static int pvpanic_register_pci_drvier(void)
+{
+	return pci_register_driver(&pvpanic_pci_driver);
+}
+
+static void pvpanic_unregister_pci_drvier(void)
+{
+	pci_unregister_driver(&pvpanic_pci_driver);
+}
+#else /* CONFIG_PCI */
+static int pvpanic_register_pci_drvier(void)
+{
+	return 0;
+}
+
+static void pvpanic_unregister_pci_drvier(void) {}
+#endif
+
 static int __init pvpanic_mmio_init(void)
 {
+	int r1, r2;
+
 	if (acpi_disabled)
-		return platform_driver_register(&pvpanic_mmio_driver);
+		r1 = platform_driver_register(&pvpanic_mmio_driver);
+	else
+		r2 = pvpanic_register_acpi_driver();
+	r2 = pvpanic_register_pci_drvier();
+	if (r1 && r2) /* all drivers register failed */
+		return 1;
 	else
-		return pvpanic_register_acpi_driver();
+		return 0;
 }
 
 static void __exit pvpanic_mmio_exit(void)
@@ -186,6 +263,7 @@ static void __exit pvpanic_mmio_exit(void)
 		platform_driver_unregister(&pvpanic_mmio_driver);
 	else
 		pvpanic_unregister_acpi_driver();
+	pvpanic_unregister_pci_drvier();
 }
 
 module_init(pvpanic_mmio_init);
-- 
1.8.3.1

[PATCH V2 3/3] misc/pvpanic : add pci dependency in Kconfig

[Peng Hao]

Add PCI dependency for pvpanic in Kconfig.

Signed-off-by: Peng Hao <peng.hao2@zte.com.cn>
---
 drivers/misc/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig
index f417b06..5ff8ca4 100644
--- a/drivers/misc/Kconfig
+++ b/drivers/misc/Kconfig
@@ -515,7 +515,7 @@ config MISC_RTSX
 
 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
-- 
1.8.3.1

Re: [PATCH V2 2/3] misc/pvpanic : add pci interface for pvpanic

[kbuild test robot]

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Hi Peng,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on char-misc/char-misc-testing]
[cannot apply to v4.20-rc7]
[if your patch is applied to the wrong git tree, please drop us a note to help improve the system]

url:    https://github.com/0day-ci/linux/commits/Peng-Hao/misc-pvpanic-return-0-for-empty-body-register-function/20181217-151203
config: ia64-allmodconfig (attached as .config)
compiler: ia64-linux-gcc (GCC) 8.1.0
reproduce:
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # save the attached .config to linux build tree
        GCC_VERSION=8.1.0 make.cross ARCH=ia64 

All warnings (new ones prefixed by >>):

   drivers//misc/pvpanic.c: In function 'pvpanic_mmio_init':
>> drivers//misc/pvpanic.c:254:6: warning: 'r1' is used uninitialized in this function [-Wuninitialized]
     if (r1 && r2) /* all drivers register failed */
         ^~

vim +/r1 +254 drivers//misc/pvpanic.c

   244	
   245	static int __init pvpanic_mmio_init(void)
   246	{
   247		int r1, r2;
   248	
   249		if (acpi_disabled)
   250			r1 = platform_driver_register(&pvpanic_mmio_driver);
   251		else
   252			r2 = pvpanic_register_acpi_driver();
   253		r2 = pvpanic_register_pci_drvier();
 > 254		if (r1 && r2) /* all drivers register failed */
   255			return 1;
   256		else
   257			return 0;
   258	}
   259	

---
0-DAY kernel test infrastructure                Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all                   Intel Corporation

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