Hi Hanjun, Marc,
On Tue, Mar 07, 2017 at 08:40:05PM +0800, Hanjun Guo wrote:
> From: Hanjun Guo <hanjun....@linaro.org>
>
> For devices connecting to ITS, the devices need to identify themself
> through a dev id; this dev id is represented in the IORT table in named
> component node [1] for platform devices, so this patch adds code that
> scans the IORT table to retrieve the devices' dev id.
>
> Leveraging the iort_node_map_platform_id() IORT API, add a new function
> call, iort_pmsi_get_dev_id() and use it in its_pmsi_prepare() to allow
> retrieving dev id in ACPI platforms.
>
> [1]: https://static.docs.arm.com/den0049/b/DEN0049B_IO_Remapping_Table.pdf
>
> Signed-off-by: Hanjun Guo <hanjun....@linaro.org>
> [lorenzo.pieral...@arm.com: rewrote commit log]
> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieral...@arm.com>
> Tested-by: Ming Lei <ming....@canonical.com>
> Tested-by: Wei Xu <xuw...@hisilicon.com>
> Tested-by: Sinan Kaya <ok...@codeaurora.org>
> Cc: Marc Zyngier <marc.zyng...@arm.com>
> Cc: Lorenzo Pieralisi <lorenzo.pieral...@arm.com>
> Cc: Tomasz Nowicki <t...@semihalf.com>
> Cc: Thomas Gleixner <t...@linutronix.de>
> ---
> drivers/acpi/arm64/iort.c | 24 ++++++++++++++++++++++++
> drivers/irqchip/irq-gic-v3-its-platform-msi.c | 3 ++-
> include/linux/acpi_iort.h | 5 +++++
> 3 files changed, 31 insertions(+), 1 deletion(-)
To simplify merging ACPI/IRQCHIP changes via different trees it
would be good to split this patch; I am not sure what's the best
way of handling it though given that we would end up in a merge
ordering dependency anyway (ie we can create an empty stub
for iort_pmsi_get_dev_id() but that would create a dependency
between ARM64 and irqchip trees anyway).
Please let me know what's your preferred way of handling this.
Thanks,
Lorenzo
> diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c
> index 83cd59d..fb95ceb 100644
> --- a/drivers/acpi/arm64/iort.c
> +++ b/drivers/acpi/arm64/iort.c
> @@ -468,6 +468,30 @@ u32 iort_msi_map_rid(struct device *dev, u32 req_id)
> }
>
> /**
> + * iort_pmsi_get_dev_id() - Get the device id for a device
> + * @dev: The device for which the mapping is to be done.
> + * @dev_id: The device ID found.
> + *
> + * Returns: 0 for successful find a dev id, -ENODEV on error
> + */
> +int iort_pmsi_get_dev_id(struct device *dev, u32 *dev_id)
> +{
> + int i;
> + struct acpi_iort_node *node;
> +
> + node = iort_find_dev_node(dev);
> + if (!node)
> + return -ENODEV;
> +
> + for (i = 0; i < node->mapping_count; i++) {
> + if (iort_node_map_platform_id(node, dev_id, IORT_MSI_TYPE, i))
> + return 0;
> + }
> +
> + return -ENODEV;
> +}
> +
> +/**
> * iort_dev_find_its_id() - Find the ITS identifier for a device
> * @dev: The device.
> * @req_id: Device's requester ID
> diff --git a/drivers/irqchip/irq-gic-v3-its-platform-msi.c
> b/drivers/irqchip/irq-gic-v3-its-platform-msi.c
> index e4ba9f4..e801fc0 100644
> --- a/drivers/irqchip/irq-gic-v3-its-platform-msi.c
> +++ b/drivers/irqchip/irq-gic-v3-its-platform-msi.c
> @@ -57,7 +57,8 @@ static int its_pmsi_prepare(struct irq_domain *domain,
> struct device *dev,
>
> msi_info = msi_get_domain_info(domain->parent);
>
> - ret = of_pmsi_get_dev_id(domain, dev, &dev_id);
> + ret = dev->of_node ? of_pmsi_get_dev_id(domain, dev, &dev_id) :
> + iort_pmsi_get_dev_id(dev, &dev_id);
> if (ret)
> return ret;
>
> diff --git a/include/linux/acpi_iort.h b/include/linux/acpi_iort.h
> index 77e0809..d074c77 100644
> --- a/include/linux/acpi_iort.h
> +++ b/include/linux/acpi_iort.h
> @@ -34,6 +34,7 @@
> bool iort_node_match(u8 type);
> u32 iort_msi_map_rid(struct device *dev, u32 req_id);
> struct irq_domain *iort_get_device_domain(struct device *dev, u32 req_id);
> +int iort_pmsi_get_dev_id(struct device *dev, u32 *dev_id);
> /* IOMMU interface */
> void iort_set_dma_mask(struct device *dev);
> const struct iommu_ops *iort_iommu_configure(struct device *dev);
> @@ -45,6 +46,10 @@ static inline u32 iort_msi_map_rid(struct device *dev, u32
> req_id)
> static inline struct irq_domain *iort_get_device_domain(struct device *dev,
> u32 req_id)
> { return NULL; }
> +
> +static inline int iort_pmsi_get_dev_id(struct device *dev, u32 *dev_id)
> +{ return -ENODEV; }
> +
> /* IOMMU interface */
> static inline void iort_set_dma_mask(struct device *dev) { }
> static inline
> --
> 1.7.12.4
>
