diff options
| author |   Thomas Gleixner <tglx@linutronix.de> | 2024-01-27 21:47:35 +0530 |
|---|---|---|
| committer | Thomas Gleixner <tglx@linutronix.de> | 2024-02-15 17:55:40 +0100 |
| commit | 9c78c1a85c04bdfbccc5a50588e001087d942b08 (patch) | |
| tree | 012927a0a843a18c204740df1d69ffcf0f697cfc /include/linux/msi.h | |
| parent | platform-msi: Remove unused interfaces (diff) | |
| download | wireguard-linux-9c78c1a85c04bdfbccc5a50588e001087d942b08.tar.xz wireguard-linux-9c78c1a85c04bdfbccc5a50588e001087d942b08.zip | |
genirq/msi: Provide optional translation op
irq_create_fwspec_mapping() requires translation of the firmware spec to a
hardware interrupt number and the trigger type information.
Wired interrupts which are connected to a wire to MSI bridge, like MBIGEN
are allocated that way. So far MBIGEN provides a regular irqdomain which
then hooks backwards into the MSI infrastructure. That's an unholy mess and
will be replaced with per device MSI domains which are regular MSI domains.
Interrupts on MSI domains are not supported by irq_create_fwspec_mapping(),
but for making the wire to MSI bridges sane it makes sense to provide a
special allocation/free interface in the MSI infrastructure. That avoids
the backdoors into the core MSI allocation code and just shares all the
regular MSI infrastructure.
Provide an optional translation callback in msi_domain_ops which can be
utilized by these wire to MSI bridges. No other MSI domain should provide a
translation callback. The default translation callback of the MSI
irqdomains will warn when it is invoked on a non-prepared MSI domain.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Anup Patel <apatel@ventanamicro.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20240127161753.114685-8-apatel@ventanamicro.com
Diffstat (limited to '')
| -rw-r--r-- | include/linux/msi.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/msi.h b/include/linux/msi.h index b0842ea55bde..24a54248f1ae 100644 --- a/include/linux/msi.h +++ b/include/linux/msi.h @@ -412,6 +412,7 @@ bool arch_restore_msi_irqs(struct pci_dev *dev); struct irq_domain; struct irq_domain_ops; struct irq_chip; +struct irq_fwspec; struct device_node; struct fwnode_handle; struct msi_domain_info; @@ -431,6 +432,8 @@ struct msi_domain_info; * function. * @msi_post_free: Optional function which is invoked after freeing * all interrupts. + * @msi_translate: Optional translate callback to support the odd wire to + * MSI bridges, e.g. MBIGEN * * @get_hwirq, @msi_init and @msi_free are callbacks used by the underlying * irqdomain. @@ -468,6 +471,8 @@ struct msi_domain_ops { struct device *dev); void (*msi_post_free)(struct irq_domain *domain, struct device *dev); + int (*msi_translate)(struct irq_domain *domain, struct irq_fwspec *fwspec, + irq_hw_number_t *hwirq, unsigned int *type); }; /** |