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SubjectRe: [PATCH V2 2/4] misc/pvpanic: add MMIO support
On Wed, Oct 24, 2018 at 12:02 PM Peng Hao <peng.hao2@zte.com.cn> wrote:
>
> 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.
>

No global variables, please.

If your switch to ioreadxx()iowritexx() it would really help you here.

> Signed-off-by: Peng Hao <peng.hao2@zte.com.cn>
> ---
> drivers/misc/pvpanic.c | 18 ++++++++++++++++--
> 1 file changed, 16 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/misc/pvpanic.c b/drivers/misc/pvpanic.c
> index fd86dab..bcfefdd 100644
> --- a/drivers/misc/pvpanic.c
> +++ b/drivers/misc/pvpanic.c
> @@ -43,6 +43,8 @@
>
> static u16 port;
>
> +static void __iomem *base;
> +
> static struct acpi_driver pvpanic_driver = {
> .name = "pvpanic",
> .class = "QEMU",
> @@ -57,7 +59,10 @@
> static void
> pvpanic_send_event(unsigned int event)
> {
> - outb(event, port);
> + if (port)
> + outb(event, port);
> + else if (base)
> + writeb(event, base);
> }
>
> static int
> @@ -77,6 +82,8 @@
> static acpi_status
> pvpanic_walk_resources(struct acpi_resource *res, void *context)
> {
> + struct acpi_resource_fixed_memory32 *fixmem32;
> +
> switch (res->type) {
> case ACPI_RESOURCE_TYPE_END_TAG:
> return AE_OK;
> @@ -85,6 +92,11 @@
> port = res->data.io.minimum;
> return AE_OK;
>
> + case ACPI_RESOURCE_TYPE_FIXED_MEMORY32:
> + fixmem32 = &res->data.fixed_memory32;
> + base = ioremap(fixmem32->address, fixmem32->address_length);
> + return AE_OK;
> +
> default:
> return AE_ERROR;
> }
> @@ -104,7 +116,7 @@ static int pvpanic_add(struct acpi_device *device)
> acpi_walk_resources(device->handle, METHOD_NAME__CRS,
> pvpanic_walk_resources, NULL);
>
> - if (!port)
> + if (!port && !base)
> return -ENODEV;
>
> atomic_notifier_chain_register(&panic_notifier_list,
> @@ -118,6 +130,8 @@ static int pvpanic_remove(struct acpi_device *device)
>
> atomic_notifier_chain_unregister(&panic_notifier_list,
> &pvpanic_panic_nb);
> + if (base)
> + iounmap(base);
> return 0;
> }
>
> --
> 1.8.3.1
>


--
With Best Regards,
Andy Shevchenko

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