linux-kernel - Re: [PATCH] virtio_mmio: add ACPI probing

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Date:	Tue, 28 Jul 2015 13:08:59 +0300
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Graeme Gregory <graeme.gregory@...aro.org>
Cc:	virtualization@...ts.linux-foundation.org,
	linux-kernel@...r.kernel.org,
	Shannon Zhao <shannon.zhao@...aro.org>,
	Alex Bennée <alex.bennee@...aro.org>,
	Peter Maydell <peter.maydell@...aro.org>
Subject: Re: [PATCH] virtio_mmio: add ACPI probing

On Tue, Jul 28, 2015 at 10:44:02AM +0100, Graeme Gregory wrote:
> Added the match table and pointers for ACPI probing to the driver.
> 
> This uses the same identifier for virt devices as being used for qemu
> ARM64 ACPI support.
> 
> http://git.linaro.org/people/shannon.zhao/qemu.git/commit/d0bf1955a3ecbab4b51d46f8c5dda02b7e14a17e
> 
> Signed-off-by: Graeme Gregory <graeme.gregory@...aro.org>
> ---
>  drivers/virtio/virtio_mmio.c | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/drivers/virtio/virtio_mmio.c b/drivers/virtio/virtio_mmio.c
> index 10189b5..f499d9d 100644
> --- a/drivers/virtio/virtio_mmio.c
> +++ b/drivers/virtio/virtio_mmio.c
> @@ -58,6 +58,7 @@
>  
>  #define pr_fmt(fmt) "virtio-mmio: " fmt
>  
> +#include <linux/acpi.h>
>  #include <linux/highmem.h>
>  #include <linux/interrupt.h>
>  #include <linux/io.h>
> @@ -732,12 +733,21 @@ static struct of_device_id virtio_mmio_match[] = {
>  };
>  MODULE_DEVICE_TABLE(of, virtio_mmio_match);
>  
> +#ifdef CONFIG_ACPI
> +static const struct acpi_device_id virtio_mmio_acpi_match[] = {
> +	{ "LNRO0005", },
> +	{ }
> +};

Hmm - we have reserved QEMUXXXX in ASWG explicitly for this purpose.

Pater - do you think it's a good idea to change this before QEMU 2.4
is released?

> +MODULE_DEVICE_TABLE(acpi, virtio_mmio_acpi_match);
> +#endif
> +
>  static struct platform_driver virtio_mmio_driver = {
>  	.probe		= virtio_mmio_probe,
>  	.remove		= virtio_mmio_remove,
>  	.driver		= {
>  		.name	= "virtio-mmio",
>  		.of_match_table	= virtio_mmio_match,
> +		.acpi_match_table = ACPI_PTR(virtio_mmio_acpi_match),
>  	},
>  };
>  
> -- 
> 2.1.4
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