The following commit has been merged into the x86/apic branch of tip: Commit-ID: 6452ea2a323b80868ce5e6d3030e4ccbeab9dc30 Gitweb: https://git.kernel.org/tip/6452ea2a323b80868ce5e6d3030e4ccbeab9dc30 Author: David Woodhouse <d...@amazon.co.uk> AuthorDate: Sat, 24 Oct 2020 22:35:23 +01:00 Committer: Thomas Gleixner <t...@linutronix.de> CommitterDate: Wed, 28 Oct 2020 20:26:27 +01:00
x86/apic: Add select() method on vector irqdomain This will be used to select the irqdomain for I/O-APIC and HPET. Signed-off-by: David Woodhouse <d...@amazon.co.uk> Signed-off-by: Thomas Gleixner <t...@linutronix.de> Link: https://lore.kernel.org/r/20201024213535.443185-24-dw...@infradead.org --- arch/x86/include/asm/irqdomain.h | 3 ++- arch/x86/kernel/apic/vector.c | 43 +++++++++++++++++++++++++++++++- 2 files changed, 46 insertions(+) diff --git a/arch/x86/include/asm/irqdomain.h b/arch/x86/include/asm/irqdomain.h index cd684d4..125c23b 100644 --- a/arch/x86/include/asm/irqdomain.h +++ b/arch/x86/include/asm/irqdomain.h @@ -12,6 +12,9 @@ enum { X86_IRQ_ALLOC_LEGACY = 0x2, }; +extern int x86_fwspec_is_ioapic(struct irq_fwspec *fwspec); +extern int x86_fwspec_is_hpet(struct irq_fwspec *fwspec); + extern struct irq_domain *x86_vector_domain; extern void init_irq_alloc_info(struct irq_alloc_info *info, diff --git a/arch/x86/kernel/apic/vector.c b/arch/x86/kernel/apic/vector.c index bb2e2a2..b9b05ca 100644 --- a/arch/x86/kernel/apic/vector.c +++ b/arch/x86/kernel/apic/vector.c @@ -636,7 +636,50 @@ static void x86_vector_debug_show(struct seq_file *m, struct irq_domain *d, } #endif +int x86_fwspec_is_ioapic(struct irq_fwspec *fwspec) +{ + if (fwspec->param_count != 1) + return 0; + + if (is_fwnode_irqchip(fwspec->fwnode)) { + const char *fwname = fwnode_get_name(fwspec->fwnode); + return fwname && !strncmp(fwname, "IO-APIC-", 8) && + simple_strtol(fwname+8, NULL, 10) == fwspec->param[0]; + } + return to_of_node(fwspec->fwnode) && + of_device_is_compatible(to_of_node(fwspec->fwnode), + "intel,ce4100-ioapic"); +} + +int x86_fwspec_is_hpet(struct irq_fwspec *fwspec) +{ + if (fwspec->param_count != 1) + return 0; + + if (is_fwnode_irqchip(fwspec->fwnode)) { + const char *fwname = fwnode_get_name(fwspec->fwnode); + return fwname && !strncmp(fwname, "HPET-MSI-", 9) && + simple_strtol(fwname+9, NULL, 10) == fwspec->param[0]; + } + return 0; +} + +static int x86_vector_select(struct irq_domain *d, struct irq_fwspec *fwspec, + enum irq_domain_bus_token bus_token) +{ + /* + * HPET and I/OAPIC cannot be parented in the vector domain + * if IRQ remapping is enabled. APIC IDs above 15 bits are + * only permitted if IRQ remapping is enabled, so check that. + */ + if (apic->apic_id_valid(32768)) + return 0; + + return x86_fwspec_is_ioapic(fwspec) || x86_fwspec_is_hpet(fwspec); +} + static const struct irq_domain_ops x86_vector_domain_ops = { + .select = x86_vector_select, .alloc = x86_vector_alloc_irqs, .free = x86_vector_free_irqs, .activate = x86_vector_activate,
