diff options
Diffstat (limited to 'drivers/misc')
| -rw-r--r-- | drivers/misc/Kconfig | 8 | ||||
| -rw-r--r-- | drivers/misc/Makefile | 1 | ||||
| -rw-r--r-- | drivers/misc/mei/client.c | 25 | ||||
| -rw-r--r-- | drivers/misc/mei/hbm.c | 4 | ||||
| -rw-r--r-- | drivers/misc/pvpanic.c | 192 |
5 files changed, 208 insertions, 22 deletions
diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig index 3726eacdf65d..642626ac1df1 100644 --- a/drivers/misc/Kconfig +++ b/drivers/misc/Kconfig @@ -513,6 +513,14 @@ config MISC_RTSX tristate default MISC_RTSX_PCI || MISC_RTSX_USB +config PVPANIC + tristate "pvpanic device support" + depends on 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/c2port/Kconfig" source "drivers/misc/eeprom/Kconfig" source "drivers/misc/cb710/Kconfig" diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile index af22bbc3d00c..b76d611c87de 100644 --- a/drivers/misc/Makefile +++ b/drivers/misc/Makefile @@ -58,3 +58,4 @@ obj-$(CONFIG_ASPEED_LPC_SNOOP) += aspeed-lpc-snoop.o obj-$(CONFIG_PCI_ENDPOINT_TEST) += pci_endpoint_test.o obj-$(CONFIG_OCXL) += ocxl/ obj-$(CONFIG_MISC_RTSX) += cardreader/ +obj-$(CONFIG_PVPANIC) += pvpanic.o diff --git a/drivers/misc/mei/client.c b/drivers/misc/mei/client.c index ebdcf0b450e2..1fe9426ce48b 100644 --- a/drivers/misc/mei/client.c +++ b/drivers/misc/mei/client.c @@ -318,23 +318,6 @@ void mei_me_cl_rm_all(struct mei_device *dev) } /** - * mei_cl_cmp_id - tells if the clients are the same - * - * @cl1: host client 1 - * @cl2: host client 2 - * - * Return: true - if the clients has same host and me ids - * false - otherwise - */ -static inline bool mei_cl_cmp_id(const struct mei_cl *cl1, - const struct mei_cl *cl2) -{ - return cl1 && cl2 && - (cl1->host_client_id == cl2->host_client_id) && - (mei_cl_me_id(cl1) == mei_cl_me_id(cl2)); -} - -/** * mei_io_cb_free - free mei_cb_private related memory * * @cb: mei callback struct @@ -418,7 +401,7 @@ static void mei_io_list_flush_cl(struct list_head *head, struct mei_cl_cb *cb, *next; list_for_each_entry_safe(cb, next, head, list) { - if (mei_cl_cmp_id(cl, cb->cl)) + if (cl == cb->cl) list_del_init(&cb->list); } } @@ -435,7 +418,7 @@ static void mei_io_tx_list_free_cl(struct list_head *head, struct mei_cl_cb *cb, *next; list_for_each_entry_safe(cb, next, head, list) { - if (mei_cl_cmp_id(cl, cb->cl)) + if (cl == cb->cl) mei_tx_cb_dequeue(cb); } } @@ -1374,7 +1357,9 @@ int mei_cl_notify_request(struct mei_cl *cl, mutex_unlock(&dev->device_lock); wait_event_timeout(cl->wait, - cl->notify_en == request || !mei_cl_is_connected(cl), + cl->notify_en == request || + cl->status || + !mei_cl_is_connected(cl), mei_secs_to_jiffies(MEI_CL_CONNECT_TIMEOUT)); mutex_lock(&dev->device_lock); diff --git a/drivers/misc/mei/hbm.c b/drivers/misc/mei/hbm.c index e56f3e72d57a..fe67381b34c3 100644 --- a/drivers/misc/mei/hbm.c +++ b/drivers/misc/mei/hbm.c @@ -1271,8 +1271,8 @@ int mei_hbm_dispatch(struct mei_device *dev, struct mei_msg_hdr *hdr) break; default: - BUG(); - break; + WARN(1, "hbm: wrong command %d\n", mei_msg->hbm_cmd); + return -EPROTO; } return 0; diff --git a/drivers/misc/pvpanic.c b/drivers/misc/pvpanic.c new file mode 100644 index 000000000000..01241ec6a5cd --- /dev/null +++ b/drivers/misc/pvpanic.c @@ -0,0 +1,192 @@ +// 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/acpi.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; + +#define PVPANIC_PANICKED (1 << 0) + +MODULE_AUTHOR("Hu Tao <hutao@cn.fujitsu.com>"); +MODULE_DESCRIPTION("pvpanic device driver"); +MODULE_LICENSE("GPL"); + +static void +pvpanic_send_event(unsigned int event) +{ + iowrite8(event, base); +} + +static int +pvpanic_panic_notify(struct notifier_block *nb, unsigned long code, + void *unused) +{ + pvpanic_send_event(PVPANIC_PANICKED); + 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 */ +}; + +#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 ret; + + ret = acpi_bus_get_status(device); + if (ret < 0) + return ret; + + if (!device->status.enabled || !device->status.functional) + return -ENODEV; + + acpi_walk_resources(device->handle, METHOD_NAME__CRS, + pvpanic_walk_resources, NULL); + + if (!base) + return -ENODEV; + + 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); + + return 0; +} + +static int pvpanic_register_acpi_driver(void) +{ + return acpi_bus_register_driver(&pvpanic_driver); +} + +static void pvpanic_unregister_acpi_driver(void) +{ + 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 (base == NULL) + return -EFAULT; + + atomic_notifier_chain_register(&panic_notifier_list, + &pvpanic_panic_nb); + + return 0; +} + +static int pvpanic_mmio_remove(struct platform_device *pdev) +{ + + 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", }, + {} +}; + +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, +}; + +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); |