linux-kernel - Re: [PATCH V1 10/10] acpi, gicv3, its: Use MADT ITS subtable to do PCI/MSI domain initialization.

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Date:	Sat, 24 Oct 2015 18:20:30 +0800
From:	Hanjun Guo <guohanjun@...wei.com>
To:	Tomasz Nowicki <tn@...ihalf.com>, <marc.zyngier@....com>,
	<tglx@...utronix.de>, <jason@...edaemon.net>, <rjw@...ysocki.net>,
	<lorenzo.pieralisi@....com>, <robert.richter@...iumnetworks.com>
CC:	<will.deacon@....com>, <Catalin.Marinas@....com>,
	<hanjun.guo@...aro.org>, <graeme.gregory@...aro.org>,
	<linux-arm-kernel@...ts.infradead.org>,
	<linux-kernel@...r.kernel.org>, <linux-acpi@...r.kernel.org>,
	<ddaney.cavm@...il.com>, <Suravee.Suthikulpanit@....com>
Subject: Re: [PATCH V1 10/10] acpi, gicv3, its: Use MADT ITS subtable to do
 PCI/MSI domain initialization.

On 2015/10/15 22:05, Tomasz Nowicki wrote:
> After refactoring DT code, we let ACPI to build ITS PCI MSI domain
> and do requester ID to device ID translation using IORT table.
>
> We have now full PCI MSI domain stack, thus we can enable ITS initialization
> from GICv3 core driver for ACPI scenario.
>
> Signed-off-by: Tomasz Nowicki <tn@...ihalf.com>
> ---
>  drivers/irqchip/irq-gic-v3-its-pci-msi.c | 48 ++++++++++++++++++++++++++++++--
>  drivers/irqchip/irq-gic-v3.c             |  3 +-
>  2 files changed, 47 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/irqchip/irq-gic-v3-its-pci-msi.c b/drivers/irqchip/irq-gic-v3-its-pci-msi.c
> index cfd35da..09ae2d8 100644
> --- a/drivers/irqchip/irq-gic-v3-its-pci-msi.c
> +++ b/drivers/irqchip/irq-gic-v3-its-pci-msi.c
> @@ -15,6 +15,8 @@
>   * along with this program.  If not, see <http://www.gnu.org/licenses/>.
>   */
>  
> +#include <linux/acpi.h>
> +#include <linux/iort.h>
>  #include <linux/msi.h>
>  #include <linux/of.h>
>  #include <linux/of_irq.h>
> @@ -59,8 +61,10 @@ static int its_pci_msi_vec_count(struct pci_dev *pdev)
>  static int its_get_pci_alias(struct pci_dev *pdev, u16 alias, void *data)
>  {
>  	struct its_pci_alias *dev_alias = data;
> +	u32 dev_id;
>  
> -	dev_alias->dev_id = alias;
> +	dev_alias->dev_id = iort_find_pci_id(pdev, alias, &dev_id) == 0 ?
> +								dev_id : alias;

Hi tomasz, I think we need to re work this patch on top of tip/irq/core
which has support for "msi-map" and "mai-parent" property support.

Thanks
Hanjun

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