linux-kernel - Re: [Xen-devel] [PATCH v2 07/16] Xen: ARM: Add support for mapping AMBA device mmio

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Message-ID: <alpine.DEB.2.02.1601181158210.16178@kaball.uk.xensource.com>
Date:	Mon, 18 Jan 2016 11:58:48 +0000
From:	Stefano Stabellini <stefano.stabellini@...citrix.com>
To:	Shannon Zhao <zhaoshenglong@...wei.com>
CC:	<linux-arm-kernel@...ts.infradead.org>,
	<ard.biesheuvel@...aro.org>, <stefano.stabellini@...rix.com>,
	<david.vrabel@...rix.com>, <mark.rutland@....com>,
	<devicetree@...r.kernel.org>, <linux-efi@...r.kernel.org>,
	<catalin.marinas@....com>, <will.deacon@....com>,
	<linux-kernel@...r.kernel.org>, <xen-devel@...ts.xen.org>,
	<julien.grall@...rix.com>, <shannon.zhao@...aro.org>,
	<peter.huangpeng@...wei.com>
Subject: Re: [Xen-devel] [PATCH v2 07/16] Xen: ARM: Add support for mapping
 AMBA device mmio

On Fri, 15 Jan 2016, Shannon Zhao wrote:
> From: Shannon Zhao <shannon.zhao@...aro.org>
> 
> Add a bus_notifier for AMBA bus device in order to map the device
> mmio regions when DOM0 booting with ACPI.
> 
> Signed-off-by: Shannon Zhao <shannon.zhao@...aro.org>

Reviewed-by: Stefano Stabellini <stefano.stabellini@...citrix.com>


>  drivers/xen/arm-device.c | 43 +++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 43 insertions(+)
> 
> diff --git a/drivers/xen/arm-device.c b/drivers/xen/arm-device.c
> index 7d902ea..9978f8d 100644
> --- a/drivers/xen/arm-device.c
> +++ b/drivers/xen/arm-device.c
> @@ -138,3 +138,46 @@ static int __init register_xen_platform_notifier(void)
>  }
>  
>  arch_initcall(register_xen_platform_notifier);
> +
> +#ifdef CONFIG_ARM_AMBA
> +#include <linux/amba/bus.h>
> +
> +static int xen_amba_notifier(struct notifier_block *nb,
> +			     unsigned long action, void *data)
> +{
> +	struct amba_device *adev = to_amba_device(data);
> +	int r = 0;
> +
> +	switch (action) {
> +	case BUS_NOTIFY_ADD_DEVICE:
> +		r = xen_map_device_mmio(&adev->res, 1);
> +		break;
> +	case BUS_NOTIFY_DEL_DEVICE:
> +		r = xen_unmap_device_mmio(&adev->res, 1);
> +		break;
> +	default:
> +		return NOTIFY_DONE;
> +	}
> +	if (r)
> +		dev_err(&adev->dev, "AMBA: Failed to %s device %s MMIO!\n",
> +			action == BUS_NOTIFY_ADD_DEVICE ? "map" :
> +			(action == BUS_NOTIFY_DEL_DEVICE ? "unmap" : "?"),
> +			adev->dev.init_name);
> +
> +	return NOTIFY_OK;
> +}
> +
> +static struct notifier_block amba_device_nb = {
> +	.notifier_call = xen_amba_notifier,
> +};
> +
> +static int __init register_xen_amba_notifier(void)
> +{
> +	if (!xen_initial_domain() || acpi_disabled)
> +		return 0;
> +
> +	return bus_register_notifier(&amba_bustype, &amba_device_nb);
> +}
> +
> +arch_initcall(register_xen_amba_notifier);
> +#endif
> -- 
> 2.0.4
> 
> 
> 
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