Hi David,
On 30/09/15 23:47, David Daney wrote:
> From: David Daney <david.daney@xxxxxxxxxx>
>
> Add pci_msi_domain_get_msi_rid() to return the MSI requester id (RID).
> Initially needed by gic-v3 based systems. It will be used by follow on
> patch to drivers/irqchip/irq-gic-v3-its-pci-msi.c
>
> Initially supports mapping the RID via OF device tree. In the future,
> this could be extended to use ACPI _IORT tables as well.
>
> Signed-off-by: David Daney <david.daney@xxxxxxxxxx>
> ---
> drivers/pci/msi.c | 31 +++++++++++++++++++++++++++++++
> include/linux/msi.h | 1 +
> 2 files changed, 32 insertions(+)
>
> diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
> index d449714..92b6dc9 100644
> --- a/drivers/pci/msi.c
> +++ b/drivers/pci/msi.c
> @@ -20,6 +20,7 @@
> #include <linux/io.h>
> #include <linux/slab.h>
> #include <linux/irqdomain.h>
> +#include <linux/of_irq.h>
>
> #include "pci.h"
>
> @@ -1327,4 +1328,34 @@ struct irq_domain *pci_msi_create_default_irq_domain(struct device_node *node,
>
> return domain;
> }
> +
> +struct get_mis_id_data {
> + u32 alias;
> +};
> +
> +static int get_msi_id_cb(struct pci_dev *pdev, u16 alias, void *data)
> +{
> + struct get_mis_id_data *s = data;
> +
> + s->alias = alias;
> + return 0;
> +}
Why not use a naked u32, since you only have a single field in this
structure? Or is it that you are anticipating other fields there?
> +/**
> + * pci_msi_domain_get_msi_rid - Get the MSI requester id (RID)
> + * @domain: The interrupt domain
> + * @pdev: The PCI device.
> + *
> + * The RID for a device is formed from the alias, with a firmware
> + * supplied mapping applied
> + *
> + * Returns: The RID.
> + */
> +u32 pci_msi_domain_get_msi_rid(struct irq_domain *domain, struct pci_dev *pdev)
> +{
> + struct get_mis_id_data d;
> +
> + d.alias = 0;
> + pci_for_each_dma_alias(pdev, get_msi_id_cb, &d);
> + return of_msi_map_rid(&pdev->dev, domain->of_node, d.alias);
Should you check whether domain->of_node is NULL first? I don't think
of_msi_map_rid would have any problem with that, but a domain that is
not backed by an of_node makes me feel a bit uneasy and would tend to
indicate that we're not using DT.
> +}
> #endif /* CONFIG_PCI_MSI_IRQ_DOMAIN */
> diff --git a/include/linux/msi.h b/include/linux/msi.h
> index ad939d0..56e3b76 100644
> --- a/include/linux/msi.h
> +++ b/include/linux/msi.h
> @@ -293,6 +293,7 @@ irq_hw_number_t pci_msi_domain_calc_hwirq(struct pci_dev *dev,
> struct msi_desc *desc);
> int pci_msi_domain_check_cap(struct irq_domain *domain,
> struct msi_domain_info *info, struct device *dev);
> +u32 pci_msi_domain_get_msi_rid(struct irq_domain *domain, struct pci_dev *pdev);
> #endif /* CONFIG_PCI_MSI_IRQ_DOMAIN */
>
> #endif /* LINUX_MSI_H */
>
Otherwise looks good to me.
Thanks,
M.
--
Jazz is not dead. It just smells funny...
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