diff options
Diffstat (limited to 'arch/sparc64/kernel/irq.c')
| -rw-r--r-- | arch/sparc64/kernel/irq.c | 104 |
1 files changed, 95 insertions, 9 deletions
diff --git a/arch/sparc64/kernel/irq.c b/arch/sparc64/kernel/irq.c index 2873835..b5ff3ee 100644 --- a/arch/sparc64/kernel/irq.c +++ b/arch/sparc64/kernel/irq.c @@ -22,6 +22,7 @@ #include <linux/seq_file.h> #include <linux/bootmem.h> #include <linux/irq.h> +#include <linux/msi.h> #include <asm/ptrace.h> #include <asm/processor.h> @@ -87,7 +88,6 @@ struct ino_bucket ivector_table[NUM_IVECS] __attribute__ ((aligned (SMP_CACHE_BY #define irq_work(__cpu) &(trap_block[(__cpu)].irq_worklist) static unsigned int virt_to_real_irq_table[NR_IRQS]; -static unsigned char virt_irq_cur = 1; static unsigned char virt_irq_alloc(unsigned int real_irq) { @@ -95,26 +95,32 @@ static unsigned char virt_irq_alloc(unsigned int real_irq) BUILD_BUG_ON(NR_IRQS >= 256); - ent = virt_irq_cur; + for (ent = 1; ent < NR_IRQS; ent++) { + if (!virt_to_real_irq_table[ent]) + break; + } if (ent >= NR_IRQS) { printk(KERN_ERR "IRQ: Out of virtual IRQs.\n"); return 0; } - virt_irq_cur = ent + 1; virt_to_real_irq_table[ent] = real_irq; return ent; } -#if 0 /* Currently unused. */ -static unsigned char real_to_virt_irq(unsigned int real_irq) +static void virt_irq_free(unsigned int virt_irq) { - struct ino_bucket *bucket = __bucket(real_irq); + unsigned int real_irq; - return bucket->virt_irq; + if (virt_irq >= NR_IRQS) + return; + + real_irq = virt_to_real_irq_table[virt_irq]; + virt_to_real_irq_table[virt_irq] = 0; + + __bucket(real_irq)->virt_irq = 0; } -#endif static unsigned int virt_to_real_irq(unsigned char virt_irq) { @@ -341,6 +347,20 @@ static void sun4v_irq_disable(unsigned int virt_irq) } } +#ifdef CONFIG_PCI_MSI +static void sun4v_msi_enable(unsigned int virt_irq) +{ + sun4v_irq_enable(virt_irq); + unmask_msi_irq(virt_irq); +} + +static void sun4v_msi_disable(unsigned int virt_irq) +{ + mask_msi_irq(virt_irq); + sun4v_irq_disable(virt_irq); +} +#endif + static void sun4v_irq_end(unsigned int virt_irq) { struct ino_bucket *bucket = virt_irq_to_bucket(virt_irq); @@ -398,6 +418,18 @@ static struct irq_chip sun4v_irq_ack = { .end = sun4v_irq_end, }; +#ifdef CONFIG_PCI_MSI +static struct irq_chip sun4v_msi = { + .typename = "sun4v+msi", + .mask = mask_msi_irq, + .unmask = unmask_msi_irq, + .enable = sun4v_msi_enable, + .disable = sun4v_msi_disable, + .ack = run_pre_handler, + .end = sun4v_irq_end, +}; +#endif + void irq_install_pre_handler(int virt_irq, void (*func)(unsigned int, void *, void *), void *arg1, void *arg2) @@ -411,7 +443,11 @@ void irq_install_pre_handler(int virt_irq, chip = get_irq_chip(virt_irq); if (chip == &sun4u_irq_ack || - chip == &sun4v_irq_ack) + chip == &sun4v_irq_ack +#ifdef CONFIG_PCI_MSI + || chip == &sun4v_msi +#endif + ) return; chip = (chip == &sun4u_irq ? @@ -489,6 +525,56 @@ out: return bucket->virt_irq; } +#ifdef CONFIG_PCI_MSI +unsigned int sun4v_build_msi(u32 devhandle, unsigned int *virt_irq_p, + unsigned int msi_start, unsigned int msi_end) +{ + struct ino_bucket *bucket; + struct irq_handler_data *data; + unsigned long sysino; + unsigned int devino; + + BUG_ON(tlb_type != hypervisor); + + /* Find a free devino in the given range. */ + for (devino = msi_start; devino < msi_end; devino++) { + sysino = sun4v_devino_to_sysino(devhandle, devino); + bucket = &ivector_table[sysino]; + if (!bucket->virt_irq) + break; + } + if (devino >= msi_end) + return 0; + + sysino = sun4v_devino_to_sysino(devhandle, devino); + bucket = &ivector_table[sysino]; + bucket->virt_irq = virt_irq_alloc(__irq(bucket)); + *virt_irq_p = bucket->virt_irq; + set_irq_chip(bucket->virt_irq, &sun4v_msi); + + data = get_irq_chip_data(bucket->virt_irq); + if (unlikely(data)) + return devino; + + data = kzalloc(sizeof(struct irq_handler_data), GFP_ATOMIC); + if (unlikely(!data)) { + prom_printf("IRQ: kzalloc(irq_handler_data) failed.\n"); + prom_halt(); + } + set_irq_chip_data(bucket->virt_irq, data); + + data->imap = ~0UL; + data->iclr = ~0UL; + + return devino; +} + +void sun4v_destroy_msi(unsigned int virt_irq) +{ + virt_irq_free(virt_irq); +} +#endif + void ack_bad_irq(unsigned int virt_irq) { struct ino_bucket *bucket = virt_irq_to_bucket(virt_irq); |
