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Commit 725eba29 authored by Peng Hao's avatar Peng Hao Committed by Greg Kroah-Hartman
Browse files

misc/pvpanic: add MMIO support 



On some architectures (e.g. arm64), it's preferable to use MMIO, since
this can be used standalone. Add MMIO support to the pvpanic driver.

Suggested-by: default avatarAndy Shevchenko <andy.shevchenko@gmail.com>
[Use acpi_dev_resource_memory API. - Andy]
Reviewed-by: default avatarAndy Shevchenko <andy.shevchenko@gmail.com>
Acked-by: default avatarMark Rutland <mark.rutland@arm.com>
Signed-off-by: default avatarPeng Hao <peng.hao2@zte.com.cn>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent d2ae1717

drivers/misc/pvpanic.c

+10 −5
Original line number Diff line number Diff line
@@ -26,6 +26,8 @@ 
#include <linux/types.h>

#include <linux/acpi.h>



static void __iomem *base;



MODULE_AUTHOR("Hu Tao <hutao@cn.fujitsu.com>");

MODULE_DESCRIPTION("pvpanic device driver");

MODULE_LICENSE("GPL");
@@ -41,8 +43,6 @@ MODULE_DEVICE_TABLE(acpi, pvpanic_device_ids); 


#define PVPANIC_PANICKED	(1 << 0)



static u16 port;



static struct acpi_driver pvpanic_driver = {

	.name =		"pvpanic",

	.class =	"QEMU",
@@ -57,7 +57,7 @@ static struct acpi_driver pvpanic_driver = { 
static void

pvpanic_send_event(unsigned int event)

{

	outb(event, port);

	iowrite8(event, base);

}



static int
@@ -80,7 +80,10 @@ pvpanic_walk_resources(struct acpi_resource *res, void *context) 
	struct resource r;



	if (acpi_dev_resource_io(res, &r)) {

		port = r.start;

		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;

	}
@@ -101,7 +104,7 @@ static int pvpanic_add(struct acpi_device *device) 
	acpi_walk_resources(device->handle, METHOD_NAME__CRS,

			    pvpanic_walk_resources, NULL);



	if (!port)

	if (!base)

		return -ENODEV;



	atomic_notifier_chain_register(&panic_notifier_list,
@@ -115,6 +118,8 @@ static int pvpanic_remove(struct acpi_device *device) 


	atomic_notifier_chain_unregister(&panic_notifier_list,

					 &pvpanic_panic_nb);

	iounmap(base);



	return 0;

}