On Fri, Jun 03, 2016 at 06:15:38PM +0100, Robin Murphy wrote:
> The PCI msi-map code is already doing double-duty translating IDs and
> retrieving MSI parents, which unsurprisingly is the same functionality
> we need for the identically-formatted PCI iommu-map property. Drag the
> core parsing routine up yet another layer into the general OF-PCI code,
> and further generalise it for either kind of lookup in either flavour
> of map property.
>
> CC: Rob Herring <robh+dt@xxxxxxxxxx>
> CC: Frank Rowand <frowand.list@xxxxxxxxx>
> CC: Marc Zyngier <marc.zyngier@xxxxxxx>
> Signed-off-by: Robin Murphy <robin.murphy@xxxxxxx>
> ---
>
> v2: No change.
>
> drivers/of/irq.c | 70 ++-------------------------------
> drivers/of/of_pci.c | 102 +++++++++++++++++++++++++++++++++++++++++++++++++
> include/linux/of_pci.h | 8 ++++
> 3 files changed, 114 insertions(+), 66 deletions(-)
[...]
> diff --git a/drivers/of/of_pci.c b/drivers/of/of_pci.c
> index 13f4fed38048..20bf5a0c57fd 100644
> --- a/drivers/of/of_pci.c
> +++ b/drivers/of/of_pci.c
> @@ -306,3 +306,105 @@ struct msi_controller *of_pci_find_msi_chip_by_node(struct device_node *of_node)
> EXPORT_SYMBOL_GPL(of_pci_find_msi_chip_by_node);
>
> #endif /* CONFIG_PCI_MSI */
> +
> +#define MASK_NAME_LEN 32 /* Safely longer than "iommu-map-mask" */
> +
> +/**
> + * of_pci_map_rid - Translate a requester ID through a downstream mapping.
> + * @np: root complex device node.
> + * @map_name: property name of the map to use.
> + * @target: optional pointer to a target device node.
> + * @id_out: optional pointer to receive the translated ID.
> + *
> + * Given a PCI requester ID, look up the appropriate implementation-defined
> + * platform ID and/or the target device which receives transactions on that
> + * ID, as per the "iommu-map" and "msi-map" bindings. @target or @id_out may
> + * be NULL if not required. If @target points to a device node pointer, only
> + * entries targeting that node will be matched; if it points to a NULL
> + * value, it will receive the device node for the first matching target entry,
> + * with a reference held.
> + *
> + * Return: 0 on success or a standard error code on failure.
> + */
> +int of_pci_map_rid(struct device_node *np, const char *map_name, u32 rid_in,
> + struct device_node **target, u32 *rid_out)
> +{
> + u32 map_mask, masked_rid;
> + int map_len;
> + const __be32 *map = NULL;
> + char mask_name[MASK_NAME_LEN];
Couldn't you avoid this if you just took const char *mask_name as a
parameter too?
Will
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