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| 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 /kernel/irq | |
| parent | 1a4671ff7a903e87e4e76213e200bb8bcfa942e4 (diff) | |
| download | linux-9c78c1a85c04bdfbccc5a50588e001087d942b08.tar.gz linux-9c78c1a85c04bdfbccc5a50588e001087d942b08.tar.bz2 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 'kernel/irq')
| -rw-r--r-- | kernel/irq/msi.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/kernel/irq/msi.c b/kernel/irq/msi.c index 79b4a58ba9c3..c0e73788e878 100644 --- a/kernel/irq/msi.c +++ b/kernel/irq/msi.c @@ -726,11 +726,26 @@ static void msi_domain_free(struct irq_domain *domain, unsigned int virq, irq_domain_free_irqs_top(domain, virq, nr_irqs); } +static int msi_domain_translate(struct irq_domain *domain, struct irq_fwspec *fwspec, + irq_hw_number_t *hwirq, unsigned int *type) +{ + struct msi_domain_info *info = domain->host_data; + + /* + * This will catch allocations through the regular irqdomain path except + * for MSI domains which really support this, e.g. MBIGEN. + */ + if (!info->ops->msi_translate) + return -ENOTSUPP; + return info->ops->msi_translate(domain, fwspec, hwirq, type); +} + static const struct irq_domain_ops msi_domain_ops = { .alloc = msi_domain_alloc, .free = msi_domain_free, .activate = msi_domain_activate, .deactivate = msi_domain_deactivate, + .translate = msi_domain_translate, }; static irq_hw_number_t msi_domain_ops_get_hwirq(struct msi_domain_info *info, |