diff options
| -rw-r--r-- | Documentation/ABI/testing/sysfs-bus-pci-devices-pvpanic | 4 | ||||
| -rw-r--r-- | drivers/misc/pvpanic/Kconfig | 8 | ||||
| -rw-r--r-- | drivers/misc/pvpanic/Makefile | 1 | ||||
| -rw-r--r-- | drivers/misc/pvpanic/pvpanic-pci.c | 125 |
4 files changed, 137 insertions, 1 deletions
diff --git a/Documentation/ABI/testing/sysfs-bus-pci-devices-pvpanic b/Documentation/ABI/testing/sysfs-bus-pci-devices-pvpanic index 1936f7324155..4ec03cd36357 100644 --- a/Documentation/ABI/testing/sysfs-bus-pci-devices-pvpanic +++ b/Documentation/ABI/testing/sysfs-bus-pci-devices-pvpanic @@ -1,4 +1,5 @@ -What: /sys/devices/pci0000:00/*/QEMU0001:00/capability +What: /sys/devices/pci0000:00/*/QEMU0001:00/capability for MMIO + /sys/bus/pci/drivers/pvpanic-pci/0000:00:0*.0/capability for PCI Date: Jan 2021 Contact: zhenwei pi <pizhenwei@bytedance.com> Description: @@ -12,6 +13,7 @@ Description: https://git.qemu.org/?p=qemu.git;a=blob_plain;f=docs/specs/pvpanic.txt What: /sys/devices/pci0000:00/*/QEMU0001:00/events + /sys/bus/pci/drivers/pvpanic-pci/0000:00:0*.0/events for PCI Date: Jan 2021 Contact: zhenwei pi <pizhenwei@bytedance.com> Description: diff --git a/drivers/misc/pvpanic/Kconfig b/drivers/misc/pvpanic/Kconfig index 454f1ee62b72..12d40a21f698 100644 --- a/drivers/misc/pvpanic/Kconfig +++ b/drivers/misc/pvpanic/Kconfig @@ -17,3 +17,11 @@ config PVPANIC_MMIO depends on HAS_IOMEM && (ACPI || OF) && PVPANIC help This driver provides support for the MMIO pvpanic device. + +config PVPANIC_PCI + tristate "pvpanic PCI device support" + depends on PCI && PVPANIC + help + This driver provides support for the PCI pvpanic device. + pvpanic is a paravirtualized device provided by QEMU which + forwards the panic events from the guest to the host. diff --git a/drivers/misc/pvpanic/Makefile b/drivers/misc/pvpanic/Makefile index e12a2dc2e982..9471df7d4f9c 100644 --- a/drivers/misc/pvpanic/Makefile +++ b/drivers/misc/pvpanic/Makefile @@ -5,3 +5,4 @@ # Copyright (C) 2021 Oracle. # obj-$(CONFIG_PVPANIC_MMIO) += pvpanic.o pvpanic-mmio.o +obj-$(CONFIG_PVPANIC_PCI) += pvpanic.o pvpanic-pci.o diff --git a/drivers/misc/pvpanic/pvpanic-pci.c b/drivers/misc/pvpanic/pvpanic-pci.c new file mode 100644 index 000000000000..f38a80a5bbc8 --- /dev/null +++ b/drivers/misc/pvpanic/pvpanic-pci.c @@ -0,0 +1,125 @@ +// SPDX-License-Identifier: GPL-2.0+ +/* + * Pvpanic PCI Device Support + * + * Copyright (C) 2021 Oracle. + */ + +#include <linux/kernel.h> +#include <linux/module.h> +#include <linux/pci.h> +#include <linux/types.h> +#include <linux/slab.h> + +#include <uapi/misc/pvpanic.h> + +#include "pvpanic.h" + +#define PCI_VENDOR_ID_REDHAT 0x1b36 +#define PCI_DEVICE_ID_REDHAT_PVPANIC 0x0011 + +MODULE_AUTHOR("Mihai Carabas <mihai.carabas@oracle.com>"); +MODULE_DESCRIPTION("pvpanic device driver "); +MODULE_LICENSE("GPL"); + +static const struct pci_device_id pvpanic_pci_id_tbl[] = { + { PCI_DEVICE(PCI_VENDOR_ID_REDHAT, PCI_DEVICE_ID_REDHAT_PVPANIC)}, + {} +}; + +static ssize_t capability_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct pvpanic_instance *pi = dev_get_drvdata(dev); + + return sysfs_emit(buf, "%x\n", pi->capability); +} +static DEVICE_ATTR_RO(capability); + +static ssize_t events_show(struct device *dev, struct device_attribute *attr, char *buf) +{ + struct pvpanic_instance *pi = dev_get_drvdata(dev); + + return sysfs_emit(buf, "%x\n", pi->events); +} + +static ssize_t events_store(struct device *dev, struct device_attribute *attr, + const char *buf, size_t count) +{ + struct pvpanic_instance *pi = dev_get_drvdata(dev); + unsigned int tmp; + int err; + + err = kstrtouint(buf, 16, &tmp); + if (err) + return err; + + if ((tmp & pi->capability) != tmp) + return -EINVAL; + + pi->events = tmp; + + return count; +} +static DEVICE_ATTR_RW(events); + +static struct attribute *pvpanic_pci_dev_attrs[] = { + &dev_attr_capability.attr, + &dev_attr_events.attr, + NULL +}; +ATTRIBUTE_GROUPS(pvpanic_pci_dev); + +static int pvpanic_pci_probe(struct pci_dev *pdev, + const struct pci_device_id *ent) +{ + struct device *dev = &pdev->dev; + struct pvpanic_instance *pi; + void __iomem *base; + int ret; + + ret = pci_enable_device(pdev); + if (ret < 0) + return ret; + + base = pci_iomap(pdev, 0, 0); + if (IS_ERR(base)) + return PTR_ERR(base); + + pi = kmalloc(sizeof(*pi), GFP_ATOMIC); + if (!pi) + return -ENOMEM; + + pi->base = base; + pi->capability = PVPANIC_PANICKED | PVPANIC_CRASH_LOADED; + + /* initlize capability by RDPT */ + pi->capability &= ioread8(base); + pi->events = pi->capability; + + dev_set_drvdata(dev, pi); + + return pvpanic_probe(pi); +} + +static void pvpanic_pci_remove(struct pci_dev *pdev) +{ + struct pvpanic_instance *pi = dev_get_drvdata(&pdev->dev); + + pvpanic_remove(pi); + iounmap(pi->base); + kfree(pi); + 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, + .driver = { + .dev_groups = pvpanic_pci_dev_groups, + }, +}; + +module_pci_driver(pvpanic_pci_driver); |