diff options
Diffstat (limited to 'arch/ia64/kernel/msi_ia64.c')
-rw-r--r-- | arch/ia64/kernel/msi_ia64.c | 80 |
1 files changed, 80 insertions, 0 deletions
diff --git a/arch/ia64/kernel/msi_ia64.c b/arch/ia64/kernel/msi_ia64.c index 60c6ef67ebb2..702a09c13238 100644 --- a/arch/ia64/kernel/msi_ia64.c +++ b/arch/ia64/kernel/msi_ia64.c @@ -5,6 +5,7 @@ #include <linux/pci.h> #include <linux/irq.h> #include <linux/msi.h> +#include <linux/dmar.h> #include <asm/smp.h> /* @@ -162,3 +163,82 @@ void arch_teardown_msi_irq(unsigned int irq) return ia64_teardown_msi_irq(irq); } + +#ifdef CONFIG_DMAR +#ifdef CONFIG_SMP +static void dmar_msi_set_affinity(unsigned int irq, cpumask_t mask) +{ + struct irq_cfg *cfg = irq_cfg + irq; + struct msi_msg msg; + int cpu = first_cpu(mask); + + + if (!cpu_online(cpu)) + return; + + if (irq_prepare_move(irq, cpu)) + return; + + dmar_msi_read(irq, &msg); + + msg.data &= ~MSI_DATA_VECTOR_MASK; + msg.data |= MSI_DATA_VECTOR(cfg->vector); + msg.address_lo &= ~MSI_ADDR_DESTID_MASK; + msg.address_lo |= MSI_ADDR_DESTID_CPU(cpu_physical_id(cpu)); + + dmar_msi_write(irq, &msg); + irq_desc[irq].affinity = mask; +} +#endif /* CONFIG_SMP */ + +struct irq_chip dmar_msi_type = { + .name = "DMAR_MSI", + .unmask = dmar_msi_unmask, + .mask = dmar_msi_mask, + .ack = ia64_ack_msi_irq, +#ifdef CONFIG_SMP + .set_affinity = dmar_msi_set_affinity, +#endif + .retrigger = ia64_msi_retrigger_irq, +}; + +static int +msi_compose_msg(struct pci_dev *pdev, unsigned int irq, struct msi_msg *msg) +{ + struct irq_cfg *cfg = irq_cfg + irq; + unsigned dest; + cpumask_t mask; + + cpus_and(mask, irq_to_domain(irq), cpu_online_map); + dest = cpu_physical_id(first_cpu(mask)); + + msg->address_hi = 0; + msg->address_lo = + MSI_ADDR_HEADER | + MSI_ADDR_DESTMODE_PHYS | + MSI_ADDR_REDIRECTION_CPU | + MSI_ADDR_DESTID_CPU(dest); + + msg->data = + MSI_DATA_TRIGGER_EDGE | + MSI_DATA_LEVEL_ASSERT | + MSI_DATA_DELIVERY_FIXED | + MSI_DATA_VECTOR(cfg->vector); + return 0; +} + +int arch_setup_dmar_msi(unsigned int irq) +{ + int ret; + struct msi_msg msg; + + ret = msi_compose_msg(NULL, irq, &msg); + if (ret < 0) + return ret; + dmar_msi_write(irq, &msg); + set_irq_chip_and_handler_name(irq, &dmar_msi_type, handle_edge_irq, + "edge"); + return 0; +} +#endif /* CONFIG_DMAR */ + |