Re: [PATCH v6 09/14] ACPI: platform: setup MSI domain for ACPI based platform device

["Rafael J. Wysocki" <rafael@kernel.org>]

On Mon, Jan 2, 2017 at 2:31 PM, Hanjun Guo <hanjun.guo@linaro.org> wrote:
> With the platform msi domain created, we can set up the msi domain
> for a platform device when it's probed.
>
> In order to do that, we need to get the domain that the platform
> device connecting to, so the iort_get_platform_device_domain() is
> introduced to retrieve the domain from iort.
>
> After the domain is retrieved, we need a proper way to set the
> domain to paltform device, as some platform devices such as an
> irqchip needs the msi irqdomain to be the interrupt parent domain,
> we need to get irqdomain before platform device is probed but after
> the platform device is allocated (the time slot of setting the
> msi domain also works for other cases). So simply call
> acpi_configure_pmsi_domain() in acpi_platform_notify() for
> platform devices will work.
>
> Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org>
> Cc: Rafael J. Wysocki <rjw@rjwysocki.net>
> Cc: Marc Zyngier <marc.zyngier@arm.com>
> Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>

ACK for the glue.c part.

> ---
>  drivers/acpi/arm64/iort.c | 43 +++++++++++++++++++++++++++++++++++++++++++
>  drivers/acpi/glue.c       |  6 ++++++
>  include/linux/acpi_iort.h |  3 +++
>  3 files changed, 52 insertions(+)
>
> diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c
> index bc68d93..6b72fcb 100644
> --- a/drivers/acpi/arm64/iort.c
> +++ b/drivers/acpi/arm64/iort.c
> @@ -527,6 +527,49 @@ struct irq_domain *iort_get_device_domain(struct device *dev, u32 req_id)
>         return irq_find_matching_fwnode(handle, DOMAIN_BUS_PCI_MSI);
>  }
>
> +/**
> + * iort_get_platform_device_domain() - Find MSI domain related to a
> + * platform device
> + * @dev: the dev pointer associated with the platform device
> + *
> + * Returns: the MSI domain for this device, NULL otherwise
> + */
> +static struct irq_domain *iort_get_platform_device_domain(struct device *dev)
> +{
> +       struct acpi_iort_node *node, *msi_parent;
> +       struct fwnode_handle *iort_fwnode;
> +       struct acpi_iort_its_group *its;
> +
> +       /* find its associated iort node */
> +       node = iort_scan_node(ACPI_IORT_NODE_NAMED_COMPONENT,
> +                             iort_match_node_callback, dev);
> +       if (!node)
> +               return NULL;
> +
> +       /* then find its msi parent node */
> +       msi_parent = iort_node_get_id(node, NULL, IORT_MSI_TYPE, 0);
> +       if (!msi_parent)
> +               return NULL;
> +
> +       /* Move to ITS specific data */
> +       its = (struct acpi_iort_its_group *)msi_parent->node_data;
> +
> +       iort_fwnode = iort_find_domain_token(its->identifiers[0]);
> +       if (!iort_fwnode)
> +               return NULL;
> +
> +       return irq_find_matching_fwnode(iort_fwnode, DOMAIN_BUS_PLATFORM_MSI);
> +}
> +
> +void acpi_configure_pmsi_domain(struct device *dev)
> +{
> +       struct irq_domain *msi_domain;
> +
> +       msi_domain = iort_get_platform_device_domain(dev);
> +       if (msi_domain)
> +               dev_set_msi_domain(dev, msi_domain);
> +}
> +
>  static int __get_pci_rid(struct pci_dev *pdev, u16 alias, void *data)
>  {
>         u32 *rid = data;
> diff --git a/drivers/acpi/glue.c b/drivers/acpi/glue.c
> index f8d6564..4a73f27 100644
> --- a/drivers/acpi/glue.c
> +++ b/drivers/acpi/glue.c
> @@ -6,6 +6,8 @@
>   *
>   * This file is released under the GPLv2.
>   */
> +
> +#include <linux/acpi_iort.h>
>  #include <linux/export.h>
>  #include <linux/init.h>
>  #include <linux/list.h>
> @@ -14,6 +16,7 @@
>  #include <linux/rwsem.h>
>  #include <linux/acpi.h>
>  #include <linux/dma-mapping.h>
> +#include <linux/platform_device.h>
>
>  #include "internal.h"
>
> @@ -315,6 +318,9 @@ static int acpi_platform_notify(struct device *dev)
>         if (!adev)
>                 goto out;
>
> +       if (dev->bus == &platform_bus_type)
> +               acpi_configure_pmsi_domain(dev);
> +
>         if (type && type->setup)
>                 type->setup(dev);
>         else if (adev->handler && adev->handler->bind)
> diff --git a/include/linux/acpi_iort.h b/include/linux/acpi_iort.h
> index ef99fd52..33f5ac3 100644
> --- a/include/linux/acpi_iort.h
> +++ b/include/linux/acpi_iort.h
> @@ -38,6 +38,7 @@
>  /* IOMMU interface */
>  void iort_set_dma_mask(struct device *dev);
>  const struct iommu_ops *iort_iommu_configure(struct device *dev);
> +void acpi_configure_pmsi_domain(struct device *dev);
>  #else
>  static inline void acpi_iort_init(void) { }
>  static inline bool iort_node_match(u8 type) { return false; }
> @@ -58,6 +59,8 @@ static inline void iort_set_dma_mask(struct device *dev) { }
>  static inline
>  const struct iommu_ops *iort_iommu_configure(struct device *dev)
>  { return NULL; }
> +
> +static inline void acpi_configure_pmsi_domain(struct device *dev) { }
>  #endif
>
>  #define IORT_ACPI_DECLARE(name, table_id, fn)          \
> --
> 1.9.1
>
> --
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