| /* |
| * I/O SAPIC support. |
| * |
| * Copyright (C) 1999 Intel Corp. |
| * Copyright (C) 1999 Asit Mallick <asit.k.mallick@intel.com> |
| * Copyright (C) 2000-2002 J.I. Lee <jung-ik.lee@intel.com> |
| * Copyright (C) 1999-2000, 2002-2003 Hewlett-Packard Co. |
| * David Mosberger-Tang <davidm@hpl.hp.com> |
| * Copyright (C) 1999 VA Linux Systems |
| * Copyright (C) 1999,2000 Walt Drummond <drummond@valinux.com> |
| * |
| * 00/04/19 D. Mosberger Rewritten to mirror more closely the x86 I/O |
| * APIC code. In particular, we now have separate |
| * handlers for edge and level triggered |
| * interrupts. |
| * 00/10/27 Asit Mallick, Goutham Rao <goutham.rao@intel.com> IRQ vector |
| * allocation PCI to vector mapping, shared PCI |
| * interrupts. |
| * 00/10/27 D. Mosberger Document things a bit more to make them more |
| * understandable. Clean up much of the old |
| * IOSAPIC cruft. |
| * 01/07/27 J.I. Lee PCI irq routing, Platform/Legacy interrupts |
| * and fixes for ACPI S5(SoftOff) support. |
| * 02/01/23 J.I. Lee iosapic pgm fixes for PCI irq routing from _PRT |
| * 02/01/07 E. Focht <efocht@ess.nec.de> Redirectable interrupt |
| * vectors in iosapic_set_affinity(), |
| * initializations for /proc/irq/#/smp_affinity |
| * 02/04/02 P. Diefenbaugh Cleaned up ACPI PCI IRQ routing. |
| * 02/04/18 J.I. Lee bug fix in iosapic_init_pci_irq |
| * 02/04/30 J.I. Lee bug fix in find_iosapic to fix ACPI PCI IRQ to |
| * IOSAPIC mapping error |
| * 02/07/29 T. Kochi Allocate interrupt vectors dynamically |
| * 02/08/04 T. Kochi Cleaned up terminology (irq, global system |
| * interrupt, vector, etc.) |
| * 02/09/20 D. Mosberger Simplified by taking advantage of ACPI's |
| * pci_irq code. |
| * 03/02/19 B. Helgaas Make pcat_compat system-wide, not per-IOSAPIC. |
| * Remove iosapic_address & gsi_base from |
| * external interfaces. Rationalize |
| * __init/__devinit attributes. |
| * 04/12/04 Ashok Raj <ashok.raj@intel.com> Intel Corporation 2004 |
| * Updated to work with irq migration necessary |
| * for CPU Hotplug |
| */ |
| /* |
| * Here is what the interrupt logic between a PCI device and the kernel looks |
| * like: |
| * |
| * (1) A PCI device raises one of the four interrupt pins (INTA, INTB, INTC, |
| * INTD). The device is uniquely identified by its bus-, and slot-number |
| * (the function number does not matter here because all functions share |
| * the same interrupt lines). |
| * |
| * (2) The motherboard routes the interrupt line to a pin on a IOSAPIC |
| * controller. Multiple interrupt lines may have to share the same |
| * IOSAPIC pin (if they're level triggered and use the same polarity). |
| * Each interrupt line has a unique Global System Interrupt (GSI) number |
| * which can be calculated as the sum of the controller's base GSI number |
| * and the IOSAPIC pin number to which the line connects. |
| * |
| * (3) The IOSAPIC uses an internal routing table entries (RTEs) to map the |
| * IOSAPIC pin into the IA-64 interrupt vector. This interrupt vector is then |
| * sent to the CPU. |
| * |
| * (4) The kernel recognizes an interrupt as an IRQ. The IRQ interface is |
| * used as architecture-independent interrupt handling mechanism in Linux. |
| * As an IRQ is a number, we have to have |
| * IA-64 interrupt vector number <-> IRQ number mapping. On smaller |
| * systems, we use one-to-one mapping between IA-64 vector and IRQ. A |
| * platform can implement platform_irq_to_vector(irq) and |
| * platform_local_vector_to_irq(vector) APIs to differentiate the mapping. |
| * Please see also include/asm-ia64/hw_irq.h for those APIs. |
| * |
| * To sum up, there are three levels of mappings involved: |
| * |
| * PCI pin -> global system interrupt (GSI) -> IA-64 vector <-> IRQ |
| * |
| * Note: The term "IRQ" is loosely used everywhere in Linux kernel to |
| * describeinterrupts. Now we use "IRQ" only for Linux IRQ's. ISA IRQ |
| * (isa_irq) is the only exception in this source code. |
| */ |
| |
| #include <linux/acpi.h> |
| #include <linux/init.h> |
| #include <linux/irq.h> |
| #include <linux/kernel.h> |
| #include <linux/list.h> |
| #include <linux/pci.h> |
| #include <linux/smp.h> |
| #include <linux/string.h> |
| #include <linux/bootmem.h> |
| |
| #include <asm/delay.h> |
| #include <asm/hw_irq.h> |
| #include <asm/io.h> |
| #include <asm/iosapic.h> |
| #include <asm/machvec.h> |
| #include <asm/processor.h> |
| #include <asm/ptrace.h> |
| #include <asm/system.h> |
| |
| #undef DEBUG_INTERRUPT_ROUTING |
| |
| #ifdef DEBUG_INTERRUPT_ROUTING |
| #define DBG(fmt...) printk(fmt) |
| #else |
| #define DBG(fmt...) |
| #endif |
| |
| #define NR_PREALLOCATE_RTE_ENTRIES \ |
| (PAGE_SIZE / sizeof(struct iosapic_rte_info)) |
| #define RTE_PREALLOCATED (1) |
| |
| static DEFINE_SPINLOCK(iosapic_lock); |
| |
| /* |
| * These tables map IA-64 vectors to the IOSAPIC pin that generates this |
| * vector. |
| */ |
| |
| #define NO_REF_RTE 0 |
| |
| static struct iosapic { |
| char __iomem *addr; /* base address of IOSAPIC */ |
| unsigned int gsi_base; /* GSI base */ |
| unsigned short num_rte; /* # of RTEs on this IOSAPIC */ |
| int rtes_inuse; /* # of RTEs in use on this IOSAPIC */ |
| #ifdef CONFIG_NUMA |
| unsigned short node; /* numa node association via pxm */ |
| #endif |
| spinlock_t lock; /* lock for indirect reg access */ |
| } iosapic_lists[NR_IOSAPICS]; |
| |
| struct iosapic_rte_info { |
| struct list_head rte_list; /* RTEs sharing the same vector */ |
| char rte_index; /* IOSAPIC RTE index */ |
| int refcnt; /* reference counter */ |
| unsigned int flags; /* flags */ |
| struct iosapic *iosapic; |
| } ____cacheline_aligned; |
| |
| static struct iosapic_intr_info { |
| struct list_head rtes; /* RTEs using this vector (empty => |
| * not an IOSAPIC interrupt) */ |
| int count; /* # of registered RTEs */ |
| u32 low32; /* current value of low word of |
| * Redirection table entry */ |
| unsigned int dest; /* destination CPU physical ID */ |
| unsigned char dmode : 3; /* delivery mode (see iosapic.h) */ |
| unsigned char polarity: 1; /* interrupt polarity |
| * (see iosapic.h) */ |
| unsigned char trigger : 1; /* trigger mode (see iosapic.h) */ |
| } iosapic_intr_info[NR_IRQS]; |
| |
| static unsigned char pcat_compat __devinitdata; /* 8259 compatibility flag */ |
| |
| static int iosapic_kmalloc_ok; |
| static LIST_HEAD(free_rte_list); |
| |
| static inline void |
| iosapic_write(struct iosapic *iosapic, unsigned int reg, u32 val) |
| { |
| unsigned long flags; |
| |
| spin_lock_irqsave(&iosapic->lock, flags); |
| __iosapic_write(iosapic->addr, reg, val); |
| spin_unlock_irqrestore(&iosapic->lock, flags); |
| } |
| |
| /* |
| * Find an IOSAPIC associated with a GSI |
| */ |
| static inline int |
| find_iosapic (unsigned int gsi) |
| { |
| int i; |
| |
| for (i = 0; i < NR_IOSAPICS; i++) { |
| if ((unsigned) (gsi - iosapic_lists[i].gsi_base) < |
| iosapic_lists[i].num_rte) |
| return i; |
| } |
| |
| return -1; |
| } |
| |
| static inline int __gsi_to_irq(unsigned int gsi) |
| { |
| int irq; |
| struct iosapic_intr_info *info; |
| struct iosapic_rte_info *rte; |
| |
| for (irq = 0; irq < NR_IRQS; irq++) { |
| info = &iosapic_intr_info[irq]; |
| list_for_each_entry(rte, &info->rtes, rte_list) |
| if (rte->iosapic->gsi_base + rte->rte_index == gsi) |
| return irq; |
| } |
| return -1; |
| } |
| |
| int |
| gsi_to_irq (unsigned int gsi) |
| { |
| unsigned long flags; |
| int irq; |
| |
| spin_lock_irqsave(&iosapic_lock, flags); |
| irq = __gsi_to_irq(gsi); |
| spin_unlock_irqrestore(&iosapic_lock, flags); |
| return irq; |
| } |
| |
| static struct iosapic_rte_info *find_rte(unsigned int irq, unsigned int gsi) |
| { |
| struct iosapic_rte_info *rte; |
| |
| list_for_each_entry(rte, &iosapic_intr_info[irq].rtes, rte_list) |
| if (rte->iosapic->gsi_base + rte->rte_index == gsi) |
| return rte; |
| return NULL; |
| } |
| |
| static void |
| set_rte (unsigned int gsi, unsigned int irq, unsigned int dest, int mask) |
| { |
| unsigned long pol, trigger, dmode; |
| u32 low32, high32; |
| int rte_index; |
| char redir; |
| struct iosapic_rte_info *rte; |
| ia64_vector vector = irq_to_vector(irq); |
| |
| DBG(KERN_DEBUG"IOSAPIC: routing vector %d to 0x%x\n", vector, dest); |
| |
| rte = find_rte(irq, gsi); |
| if (!rte) |
| return; /* not an IOSAPIC interrupt */ |
| |
| rte_index = rte->rte_index; |
| pol = iosapic_intr_info[irq].polarity; |
| trigger = iosapic_intr_info[irq].trigger; |
| dmode = iosapic_intr_info[irq].dmode; |
| |
| redir = (dmode == IOSAPIC_LOWEST_PRIORITY) ? 1 : 0; |
| |
| #ifdef CONFIG_SMP |
| set_irq_affinity_info(irq, (int)(dest & 0xffff), redir); |
| #endif |
| |
| low32 = ((pol << IOSAPIC_POLARITY_SHIFT) | |
| (trigger << IOSAPIC_TRIGGER_SHIFT) | |
| (dmode << IOSAPIC_DELIVERY_SHIFT) | |
| ((mask ? 1 : 0) << IOSAPIC_MASK_SHIFT) | |
| vector); |
| |
| /* dest contains both id and eid */ |
| high32 = (dest << IOSAPIC_DEST_SHIFT); |
| |
| iosapic_write(rte->iosapic, IOSAPIC_RTE_HIGH(rte_index), high32); |
| iosapic_write(rte->iosapic, IOSAPIC_RTE_LOW(rte_index), low32); |
| iosapic_intr_info[irq].low32 = low32; |
| iosapic_intr_info[irq].dest = dest; |
| } |
| |
| static void |
| nop (unsigned int irq) |
| { |
| /* do nothing... */ |
| } |
| |
| |
| #ifdef CONFIG_KEXEC |
| void |
| kexec_disable_iosapic(void) |
| { |
| struct iosapic_intr_info *info; |
| struct iosapic_rte_info *rte; |
| ia64_vector vec; |
| int irq; |
| |
| for (irq = 0; irq < NR_IRQS; irq++) { |
| info = &iosapic_intr_info[irq]; |
| vec = irq_to_vector(irq); |
| list_for_each_entry(rte, &info->rtes, |
| rte_list) { |
| iosapic_write(rte->iosapic, |
| IOSAPIC_RTE_LOW(rte->rte_index), |
| IOSAPIC_MASK|vec); |
| iosapic_eoi(rte->iosapic->addr, vec); |
| } |
| } |
| } |
| #endif |
| |
| static void |
| mask_irq (unsigned int irq) |
| { |
| u32 low32; |
| int rte_index; |
| struct iosapic_rte_info *rte; |
| |
| if (!iosapic_intr_info[irq].count) |
| return; /* not an IOSAPIC interrupt! */ |
| |
| /* set only the mask bit */ |
| low32 = iosapic_intr_info[irq].low32 |= IOSAPIC_MASK; |
| list_for_each_entry(rte, &iosapic_intr_info[irq].rtes, rte_list) { |
| rte_index = rte->rte_index; |
| iosapic_write(rte->iosapic, IOSAPIC_RTE_LOW(rte_index), low32); |
| } |
| } |
| |
| static void |
| unmask_irq (unsigned int irq) |
| { |
| u32 low32; |
| int rte_index; |
| struct iosapic_rte_info *rte; |
| |
| if (!iosapic_intr_info[irq].count) |
| return; /* not an IOSAPIC interrupt! */ |
| |
| low32 = iosapic_intr_info[irq].low32 &= ~IOSAPIC_MASK; |
| list_for_each_entry(rte, &iosapic_intr_info[irq].rtes, rte_list) { |
| rte_index = rte->rte_index; |
| iosapic_write(rte->iosapic, IOSAPIC_RTE_LOW(rte_index), low32); |
| } |
| } |
| |
| |
| static void |
| iosapic_set_affinity (unsigned int irq, cpumask_t mask) |
| { |
| #ifdef CONFIG_SMP |
| u32 high32, low32; |
| int dest, rte_index; |
| int redir = (irq & IA64_IRQ_REDIRECTED) ? 1 : 0; |
| struct iosapic_rte_info *rte; |
| struct iosapic *iosapic; |
| |
| irq &= (~IA64_IRQ_REDIRECTED); |
| |
| cpus_and(mask, mask, cpu_online_map); |
| if (cpus_empty(mask)) |
| return; |
| |
| if (irq_prepare_move(irq, first_cpu(mask))) |
| return; |
| |
| dest = cpu_physical_id(first_cpu(mask)); |
| |
| if (!iosapic_intr_info[irq].count) |
| return; /* not an IOSAPIC interrupt */ |
| |
| set_irq_affinity_info(irq, dest, redir); |
| |
| /* dest contains both id and eid */ |
| high32 = dest << IOSAPIC_DEST_SHIFT; |
| |
| low32 = iosapic_intr_info[irq].low32 & ~(7 << IOSAPIC_DELIVERY_SHIFT); |
| if (redir) |
| /* change delivery mode to lowest priority */ |
| low32 |= (IOSAPIC_LOWEST_PRIORITY << IOSAPIC_DELIVERY_SHIFT); |
| else |
| /* change delivery mode to fixed */ |
| low32 |= (IOSAPIC_FIXED << IOSAPIC_DELIVERY_SHIFT); |
| low32 &= IOSAPIC_VECTOR_MASK; |
| low32 |= irq_to_vector(irq); |
| |
| iosapic_intr_info[irq].low32 = low32; |
| iosapic_intr_info[irq].dest = dest; |
| list_for_each_entry(rte, &iosapic_intr_info[irq].rtes, rte_list) { |
| iosapic = rte->iosapic; |
| rte_index = rte->rte_index; |
| iosapic_write(iosapic, IOSAPIC_RTE_HIGH(rte_index), high32); |
| iosapic_write(iosapic, IOSAPIC_RTE_LOW(rte_index), low32); |
| } |
| #endif |
| } |
| |
| /* |
| * Handlers for level-triggered interrupts. |
| */ |
| |
| static unsigned int |
| iosapic_startup_level_irq (unsigned int irq) |
| { |
| unmask_irq(irq); |
| return 0; |
| } |
| |
| static void |
| iosapic_end_level_irq (unsigned int irq) |
| { |
| ia64_vector vec = irq_to_vector(irq); |
| struct iosapic_rte_info *rte; |
| int do_unmask_irq = 0; |
| |
| irq_complete_move(irq); |
| if (unlikely(irq_desc[irq].status & IRQ_MOVE_PENDING)) { |
| do_unmask_irq = 1; |
| mask_irq(irq); |
| } |
| |
| list_for_each_entry(rte, &iosapic_intr_info[irq].rtes, rte_list) |
| iosapic_eoi(rte->iosapic->addr, vec); |
| |
| if (unlikely(do_unmask_irq)) { |
| move_masked_irq(irq); |
| unmask_irq(irq); |
| } |
| } |
| |
| #define iosapic_shutdown_level_irq mask_irq |
| #define iosapic_enable_level_irq unmask_irq |
| #define iosapic_disable_level_irq mask_irq |
| #define iosapic_ack_level_irq nop |
| |
| static struct irq_chip irq_type_iosapic_level = { |
| .name = "IO-SAPIC-level", |
| .startup = iosapic_startup_level_irq, |
| .shutdown = iosapic_shutdown_level_irq, |
| .enable = iosapic_enable_level_irq, |
| .disable = iosapic_disable_level_irq, |
| .ack = iosapic_ack_level_irq, |
| .end = iosapic_end_level_irq, |
| .mask = mask_irq, |
| .unmask = unmask_irq, |
| .set_affinity = iosapic_set_affinity |
| }; |
| |
| /* |
| * Handlers for edge-triggered interrupts. |
| */ |
| |
| static unsigned int |
| iosapic_startup_edge_irq (unsigned int irq) |
| { |
| unmask_irq(irq); |
| /* |
| * IOSAPIC simply drops interrupts pended while the |
| * corresponding pin was masked, so we can't know if an |
| * interrupt is pending already. Let's hope not... |
| */ |
| return 0; |
| } |
| |
| static void |
| iosapic_ack_edge_irq (unsigned int irq) |
| { |
| irq_desc_t *idesc = irq_desc + irq; |
| |
| irq_complete_move(irq); |
| move_native_irq(irq); |
| /* |
| * Once we have recorded IRQ_PENDING already, we can mask the |
| * interrupt for real. This prevents IRQ storms from unhandled |
| * devices. |
| */ |
| if ((idesc->status & (IRQ_PENDING|IRQ_DISABLED)) == |
| (IRQ_PENDING|IRQ_DISABLED)) |
| mask_irq(irq); |
| } |
| |
| #define iosapic_enable_edge_irq unmask_irq |
| #define iosapic_disable_edge_irq nop |
| #define iosapic_end_edge_irq nop |
| |
| static struct irq_chip irq_type_iosapic_edge = { |
| .name = "IO-SAPIC-edge", |
| .startup = iosapic_startup_edge_irq, |
| .shutdown = iosapic_disable_edge_irq, |
| .enable = iosapic_enable_edge_irq, |
| .disable = iosapic_disable_edge_irq, |
| .ack = iosapic_ack_edge_irq, |
| .end = iosapic_end_edge_irq, |
| .mask = mask_irq, |
| .unmask = unmask_irq, |
| .set_affinity = iosapic_set_affinity |
| }; |
| |
| static unsigned int |
| iosapic_version (char __iomem *addr) |
| { |
| /* |
| * IOSAPIC Version Register return 32 bit structure like: |
| * { |
| * unsigned int version : 8; |
| * unsigned int reserved1 : 8; |
| * unsigned int max_redir : 8; |
| * unsigned int reserved2 : 8; |
| * } |
| */ |
| return __iosapic_read(addr, IOSAPIC_VERSION); |
| } |
| |
| static int iosapic_find_sharable_irq(unsigned long trigger, unsigned long pol) |
| { |
| int i, irq = -ENOSPC, min_count = -1; |
| struct iosapic_intr_info *info; |
| |
| /* |
| * shared vectors for edge-triggered interrupts are not |
| * supported yet |
| */ |
| if (trigger == IOSAPIC_EDGE) |
| return -EINVAL; |
| |
| for (i = 0; i <= NR_IRQS; i++) { |
| info = &iosapic_intr_info[i]; |
| if (info->trigger == trigger && info->polarity == pol && |
| (info->dmode == IOSAPIC_FIXED || |
| info->dmode == IOSAPIC_LOWEST_PRIORITY) && |
| can_request_irq(i, IRQF_SHARED)) { |
| if (min_count == -1 || info->count < min_count) { |
| irq = i; |
| min_count = info->count; |
| } |
| } |
| } |
| return irq; |
| } |
| |
| /* |
| * if the given vector is already owned by other, |
| * assign a new vector for the other and make the vector available |
| */ |
| static void __init |
| iosapic_reassign_vector (int irq) |
| { |
| int new_irq; |
| |
| if (iosapic_intr_info[irq].count) { |
| new_irq = create_irq(); |
| if (new_irq < 0) |
| panic("%s: out of interrupt vectors!\n", __func__); |
| printk(KERN_INFO "Reassigning vector %d to %d\n", |
| irq_to_vector(irq), irq_to_vector(new_irq)); |
| memcpy(&iosapic_intr_info[new_irq], &iosapic_intr_info[irq], |
| sizeof(struct iosapic_intr_info)); |
| INIT_LIST_HEAD(&iosapic_intr_info[new_irq].rtes); |
| list_move(iosapic_intr_info[irq].rtes.next, |
| &iosapic_intr_info[new_irq].rtes); |
| memset(&iosapic_intr_info[irq], 0, |
| sizeof(struct iosapic_intr_info)); |
| iosapic_intr_info[irq].low32 = IOSAPIC_MASK; |
| INIT_LIST_HEAD(&iosapic_intr_info[irq].rtes); |
| } |
| } |
| |
| static struct iosapic_rte_info * __init_refok iosapic_alloc_rte (void) |
| { |
| int i; |
| struct iosapic_rte_info *rte; |
| int preallocated = 0; |
| |
| if (!iosapic_kmalloc_ok && list_empty(&free_rte_list)) { |
| rte = alloc_bootmem(sizeof(struct iosapic_rte_info) * |
| NR_PREALLOCATE_RTE_ENTRIES); |
| for (i = 0; i < NR_PREALLOCATE_RTE_ENTRIES; i++, rte++) |
| list_add(&rte->rte_list, &free_rte_list); |
| } |
| |
| if (!list_empty(&free_rte_list)) { |
| rte = list_entry(free_rte_list.next, struct iosapic_rte_info, |
| rte_list); |
| list_del(&rte->rte_list); |
| preallocated++; |
| } else { |
| rte = kmalloc(sizeof(struct iosapic_rte_info), GFP_ATOMIC); |
| if (!rte) |
| return NULL; |
| } |
| |
| memset(rte, 0, sizeof(struct iosapic_rte_info)); |
| if (preallocated) |
| rte->flags |= RTE_PREALLOCATED; |
| |
| return rte; |
| } |
| |
| static inline int irq_is_shared (int irq) |
| { |
| return (iosapic_intr_info[irq].count > 1); |
| } |
| |
| static int |
| register_intr (unsigned int gsi, int irq, unsigned char delivery, |
| unsigned long polarity, unsigned long trigger) |
| { |
| irq_desc_t *idesc; |
| struct hw_interrupt_type *irq_type; |
| int index; |
| struct iosapic_rte_info *rte; |
| |
| index = find_iosapic(gsi); |
| if (index < 0) { |
| printk(KERN_WARNING "%s: No IOSAPIC for GSI %u\n", |
| __func__, gsi); |
| return -ENODEV; |
| } |
| |
| rte = find_rte(irq, gsi); |
| if (!rte) { |
| rte = iosapic_alloc_rte(); |
| if (!rte) { |
| printk(KERN_WARNING "%s: cannot allocate memory\n", |
| __func__); |
| return -ENOMEM; |
| } |
| |
| rte->iosapic = &iosapic_lists[index]; |
| rte->rte_index = gsi - rte->iosapic->gsi_base; |
| rte->refcnt++; |
| list_add_tail(&rte->rte_list, &iosapic_intr_info[irq].rtes); |
| iosapic_intr_info[irq].count++; |
| iosapic_lists[index].rtes_inuse++; |
| } |
| else if (rte->refcnt == NO_REF_RTE) { |
| struct iosapic_intr_info *info = &iosapic_intr_info[irq]; |
| if (info->count > 0 && |
| (info->trigger != trigger || info->polarity != polarity)){ |
| printk (KERN_WARNING |
| "%s: cannot override the interrupt\n", |
| __func__); |
| return -EINVAL; |
| } |
| rte->refcnt++; |
| iosapic_intr_info[irq].count++; |
| iosapic_lists[index].rtes_inuse++; |
| } |
| |
| iosapic_intr_info[irq].polarity = polarity; |
| iosapic_intr_info[irq].dmode = delivery; |
| iosapic_intr_info[irq].trigger = trigger; |
| |
| if (trigger == IOSAPIC_EDGE) |
| irq_type = &irq_type_iosapic_edge; |
| else |
| irq_type = &irq_type_iosapic_level; |
| |
| idesc = irq_desc + irq; |
| if (idesc->chip != irq_type) { |
| if (idesc->chip != &no_irq_type) |
| printk(KERN_WARNING |
| "%s: changing vector %d from %s to %s\n", |
| __func__, irq_to_vector(irq), |
| idesc->chip->name, irq_type->name); |
| idesc->chip = irq_type; |
| } |
| return 0; |
| } |
| |
| static unsigned int |
| get_target_cpu (unsigned int gsi, int irq) |
| { |
| #ifdef CONFIG_SMP |
| static int cpu = -1; |
| extern int cpe_vector; |
| cpumask_t domain = irq_to_domain(irq); |
| |
| /* |
| * In case of vector shared by multiple RTEs, all RTEs that |
| * share the vector need to use the same destination CPU. |
| */ |
| if (iosapic_intr_info[irq].count) |
| return iosapic_intr_info[irq].dest; |
| |
| /* |
| * If the platform supports redirection via XTP, let it |
| * distribute interrupts. |
| */ |
| if (smp_int_redirect & SMP_IRQ_REDIRECTION) |
| return cpu_physical_id(smp_processor_id()); |
| |
| /* |
| * Some interrupts (ACPI SCI, for instance) are registered |
| * before the BSP is marked as online. |
| */ |
| if (!cpu_online(smp_processor_id())) |
| return cpu_physical_id(smp_processor_id()); |
| |
| #ifdef CONFIG_ACPI |
| if (cpe_vector > 0 && irq_to_vector(irq) == IA64_CPEP_VECTOR) |
| return get_cpei_target_cpu(); |
| #endif |
| |
| #ifdef CONFIG_NUMA |
| { |
| int num_cpus, cpu_index, iosapic_index, numa_cpu, i = 0; |
| cpumask_t cpu_mask; |
| |
| iosapic_index = find_iosapic(gsi); |
| if (iosapic_index < 0 || |
| iosapic_lists[iosapic_index].node == MAX_NUMNODES) |
| goto skip_numa_setup; |
| |
| cpu_mask = node_to_cpumask(iosapic_lists[iosapic_index].node); |
| cpus_and(cpu_mask, cpu_mask, domain); |
| for_each_cpu_mask(numa_cpu, cpu_mask) { |
| if (!cpu_online(numa_cpu)) |
| cpu_clear(numa_cpu, cpu_mask); |
| } |
| |
| num_cpus = cpus_weight(cpu_mask); |
| |
| if (!num_cpus) |
| goto skip_numa_setup; |
| |
| /* Use irq assignment to distribute across cpus in node */ |
| cpu_index = irq % num_cpus; |
| |
| for (numa_cpu = first_cpu(cpu_mask) ; i < cpu_index ; i++) |
| numa_cpu = next_cpu(numa_cpu, cpu_mask); |
| |
| if (numa_cpu != NR_CPUS) |
| return cpu_physical_id(numa_cpu); |
| } |
| skip_numa_setup: |
| #endif |
| /* |
| * Otherwise, round-robin interrupt vectors across all the |
| * processors. (It'd be nice if we could be smarter in the |
| * case of NUMA.) |
| */ |
| do { |
| if (++cpu >= NR_CPUS) |
| cpu = 0; |
| } while (!cpu_online(cpu) || !cpu_isset(cpu, domain)); |
| |
| return cpu_physical_id(cpu); |
| #else /* CONFIG_SMP */ |
| return cpu_physical_id(smp_processor_id()); |
| #endif |
| } |
| |
| static inline unsigned char choose_dmode(void) |
| { |
| #ifdef CONFIG_SMP |
| if (smp_int_redirect & SMP_IRQ_REDIRECTION) |
| return IOSAPIC_LOWEST_PRIORITY; |
| #endif |
| return IOSAPIC_FIXED; |
| } |
| |
| /* |
| * ACPI can describe IOSAPIC interrupts via static tables and namespace |
| * methods. This provides an interface to register those interrupts and |
| * program the IOSAPIC RTE. |
| */ |
| int |
| iosapic_register_intr (unsigned int gsi, |
| unsigned long polarity, unsigned long trigger) |
| { |
| int irq, mask = 1, err; |
| unsigned int dest; |
| unsigned long flags; |
| struct iosapic_rte_info *rte; |
| u32 low32; |
| unsigned char dmode; |
| |
| /* |
| * If this GSI has already been registered (i.e., it's a |
| * shared interrupt, or we lost a race to register it), |
| * don't touch the RTE. |
| */ |
| spin_lock_irqsave(&iosapic_lock, flags); |
| irq = __gsi_to_irq(gsi); |
| if (irq > 0) { |
| rte = find_rte(irq, gsi); |
| if(iosapic_intr_info[irq].count == 0) { |
| assign_irq_vector(irq); |
| dynamic_irq_init(irq); |
| } else if (rte->refcnt != NO_REF_RTE) { |
| rte->refcnt++; |
| goto unlock_iosapic_lock; |
| } |
| } else |
| irq = create_irq(); |
| |
| /* If vector is running out, we try to find a sharable vector */ |
| if (irq < 0) { |
| irq = iosapic_find_sharable_irq(trigger, polarity); |
| if (irq < 0) |
| goto unlock_iosapic_lock; |
| } |
| |
| spin_lock(&irq_desc[irq].lock); |
| dest = get_target_cpu(gsi, irq); |
| dmode = choose_dmode(); |
| err = register_intr(gsi, irq, dmode, polarity, trigger); |
| if (err < 0) { |
| spin_unlock(&irq_desc[irq].lock); |
| irq = err; |
| goto unlock_iosapic_lock; |
| } |
| |
| /* |
| * If the vector is shared and already unmasked for other |
| * interrupt sources, don't mask it. |
| */ |
| low32 = iosapic_intr_info[irq].low32; |
| if (irq_is_shared(irq) && !(low32 & IOSAPIC_MASK)) |
| mask = 0; |
| set_rte(gsi, irq, dest, mask); |
| |
| printk(KERN_INFO "GSI %u (%s, %s) -> CPU %d (0x%04x) vector %d\n", |
| gsi, (trigger == IOSAPIC_EDGE ? "edge" : "level"), |
| (polarity == IOSAPIC_POL_HIGH ? "high" : "low"), |
| cpu_logical_id(dest), dest, irq_to_vector(irq)); |
| |
| spin_unlock(&irq_desc[irq].lock); |
| unlock_iosapic_lock: |
| spin_unlock_irqrestore(&iosapic_lock, flags); |
| return irq; |
| } |
| |
| void |
| iosapic_unregister_intr (unsigned int gsi) |
| { |
| unsigned long flags; |
| int irq, index; |
| irq_desc_t *idesc; |
| u32 low32; |
| unsigned long trigger, polarity; |
| unsigned int dest; |
| struct iosapic_rte_info *rte; |
| |
| /* |
| * If the irq associated with the gsi is not found, |
| * iosapic_unregister_intr() is unbalanced. We need to check |
| * this again after getting locks. |
| */ |
| irq = gsi_to_irq(gsi); |
| if (irq < 0) { |
| printk(KERN_ERR "iosapic_unregister_intr(%u) unbalanced\n", |
| gsi); |
| WARN_ON(1); |
| return; |
| } |
| |
| spin_lock_irqsave(&iosapic_lock, flags); |
| if ((rte = find_rte(irq, gsi)) == NULL) { |
| printk(KERN_ERR "iosapic_unregister_intr(%u) unbalanced\n", |
| gsi); |
| WARN_ON(1); |
| goto out; |
| } |
| |
| if (--rte->refcnt > 0) |
| goto out; |
| |
| idesc = irq_desc + irq; |
| rte->refcnt = NO_REF_RTE; |
| |
| /* Mask the interrupt */ |
| low32 = iosapic_intr_info[irq].low32 | IOSAPIC_MASK; |
| iosapic_write(rte->iosapic, IOSAPIC_RTE_LOW(rte->rte_index), low32); |
| |
| iosapic_intr_info[irq].count--; |
| index = find_iosapic(gsi); |
| iosapic_lists[index].rtes_inuse--; |
| WARN_ON(iosapic_lists[index].rtes_inuse < 0); |
| |
| trigger = iosapic_intr_info[irq].trigger; |
| polarity = iosapic_intr_info[irq].polarity; |
| dest = iosapic_intr_info[irq].dest; |
| printk(KERN_INFO |
| "GSI %u (%s, %s) -> CPU %d (0x%04x) vector %d unregistered\n", |
| gsi, (trigger == IOSAPIC_EDGE ? "edge" : "level"), |
| (polarity == IOSAPIC_POL_HIGH ? "high" : "low"), |
| cpu_logical_id(dest), dest, irq_to_vector(irq)); |
| |
| if (iosapic_intr_info[irq].count == 0) { |
| #ifdef CONFIG_SMP |
| /* Clear affinity */ |
| cpus_setall(idesc->affinity); |
| #endif |
| /* Clear the interrupt information */ |
| iosapic_intr_info[irq].dest = 0; |
| iosapic_intr_info[irq].dmode = 0; |
| iosapic_intr_info[irq].polarity = 0; |
| iosapic_intr_info[irq].trigger = 0; |
| iosapic_intr_info[irq].low32 |= IOSAPIC_MASK; |
| |
| /* Destroy and reserve IRQ */ |
| destroy_and_reserve_irq(irq); |
| } |
| out: |
| spin_unlock_irqrestore(&iosapic_lock, flags); |
| } |
| |
| /* |
| * ACPI calls this when it finds an entry for a platform interrupt. |
| */ |
| int __init |
| iosapic_register_platform_intr (u32 int_type, unsigned int gsi, |
| int iosapic_vector, u16 eid, u16 id, |
| unsigned long polarity, unsigned long trigger) |
| { |
| static const char * const name[] = {"unknown", "PMI", "INIT", "CPEI"}; |
| unsigned char delivery; |
| int irq, vector, mask = 0; |
| unsigned int dest = ((id << 8) | eid) & 0xffff; |
| |
| switch (int_type) { |
| case ACPI_INTERRUPT_PMI: |
| irq = vector = iosapic_vector; |
| bind_irq_vector(irq, vector, CPU_MASK_ALL); |
| /* |
| * since PMI vector is alloc'd by FW(ACPI) not by kernel, |
| * we need to make sure the vector is available |
| */ |
| iosapic_reassign_vector(irq); |
| delivery = IOSAPIC_PMI; |
| break; |
| case ACPI_INTERRUPT_INIT: |
| irq = create_irq(); |
| if (irq < 0) |
| panic("%s: out of interrupt vectors!\n", __func__); |
| vector = irq_to_vector(irq); |
| delivery = IOSAPIC_INIT; |
| break; |
| case ACPI_INTERRUPT_CPEI: |
| irq = vector = IA64_CPE_VECTOR; |
| BUG_ON(bind_irq_vector(irq, vector, CPU_MASK_ALL)); |
| delivery = IOSAPIC_FIXED; |
| mask = 1; |
| break; |
| default: |
| printk(KERN_ERR "%s: invalid int type 0x%x\n", __func__, |
| int_type); |
| return -1; |
| } |
| |
| register_intr(gsi, irq, delivery, polarity, trigger); |
| |
| printk(KERN_INFO |
| "PLATFORM int %s (0x%x): GSI %u (%s, %s) -> CPU %d (0x%04x)" |
| " vector %d\n", |
| int_type < ARRAY_SIZE(name) ? name[int_type] : "unknown", |
| int_type, gsi, (trigger == IOSAPIC_EDGE ? "edge" : "level"), |
| (polarity == IOSAPIC_POL_HIGH ? "high" : "low"), |
| cpu_logical_id(dest), dest, vector); |
| |
| set_rte(gsi, irq, dest, mask); |
| return vector; |
| } |
| |
| /* |
| * ACPI calls this when it finds an entry for a legacy ISA IRQ override. |
| */ |
| void __devinit |
| iosapic_override_isa_irq (unsigned int isa_irq, unsigned int gsi, |
| unsigned long polarity, |
| unsigned long trigger) |
| { |
| int vector, irq; |
| unsigned int dest = cpu_physical_id(smp_processor_id()); |
| unsigned char dmode; |
| |
| irq = vector = isa_irq_to_vector(isa_irq); |
| BUG_ON(bind_irq_vector(irq, vector, CPU_MASK_ALL)); |
| dmode = choose_dmode(); |
| register_intr(gsi, irq, dmode, polarity, trigger); |
| |
| DBG("ISA: IRQ %u -> GSI %u (%s,%s) -> CPU %d (0x%04x) vector %d\n", |
| isa_irq, gsi, trigger == IOSAPIC_EDGE ? "edge" : "level", |
| polarity == IOSAPIC_POL_HIGH ? "high" : "low", |
| cpu_logical_id(dest), dest, vector); |
| |
| set_rte(gsi, irq, dest, 1); |
| } |
| |
| void __init |
| iosapic_system_init (int system_pcat_compat) |
| { |
| int irq; |
| |
| for (irq = 0; irq < NR_IRQS; ++irq) { |
| iosapic_intr_info[irq].low32 = IOSAPIC_MASK; |
| /* mark as unused */ |
| INIT_LIST_HEAD(&iosapic_intr_info[irq].rtes); |
| |
| iosapic_intr_info[irq].count = 0; |
| } |
| |
| pcat_compat = system_pcat_compat; |
| if (pcat_compat) { |
| /* |
| * Disable the compatibility mode interrupts (8259 style), |
| * needs IN/OUT support enabled. |
| */ |
| printk(KERN_INFO |
| "%s: Disabling PC-AT compatible 8259 interrupts\n", |
| __func__); |
| outb(0xff, 0xA1); |
| outb(0xff, 0x21); |
| } |
| } |
| |
| static inline int |
| iosapic_alloc (void) |
| { |
| int index; |
| |
| for (index = 0; index < NR_IOSAPICS; index++) |
| if (!iosapic_lists[index].addr) |
| return index; |
| |
| printk(KERN_WARNING "%s: failed to allocate iosapic\n", __func__); |
| return -1; |
| } |
| |
| static inline void |
| iosapic_free (int index) |
| { |
| memset(&iosapic_lists[index], 0, sizeof(iosapic_lists[0])); |
| } |
| |
| static inline int |
| iosapic_check_gsi_range (unsigned int gsi_base, unsigned int ver) |
| { |
| int index; |
| unsigned int gsi_end, base, end; |
| |
| /* check gsi range */ |
| gsi_end = gsi_base + ((ver >> 16) & 0xff); |
| for (index = 0; index < NR_IOSAPICS; index++) { |
| if (!iosapic_lists[index].addr) |
| continue; |
| |
| base = iosapic_lists[index].gsi_base; |
| end = base + iosapic_lists[index].num_rte - 1; |
| |
| if (gsi_end < base || end < gsi_base) |
| continue; /* OK */ |
| |
| return -EBUSY; |
| } |
| return 0; |
| } |
| |
| int __devinit |
| iosapic_init (unsigned long phys_addr, unsigned int gsi_base) |
| { |
| int num_rte, err, index; |
| unsigned int isa_irq, ver; |
| char __iomem *addr; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&iosapic_lock, flags); |
| index = find_iosapic(gsi_base); |
| if (index >= 0) { |
| spin_unlock_irqrestore(&iosapic_lock, flags); |
| return -EBUSY; |
| } |
| |
| addr = ioremap(phys_addr, 0); |
| ver = iosapic_version(addr); |
| if ((err = iosapic_check_gsi_range(gsi_base, ver))) { |
| iounmap(addr); |
| spin_unlock_irqrestore(&iosapic_lock, flags); |
| return err; |
| } |
| |
| /* |
| * The MAX_REDIR register holds the highest input pin number |
| * (starting from 0). We add 1 so that we can use it for |
| * number of pins (= RTEs) |
| */ |
| num_rte = ((ver >> 16) & 0xff) + 1; |
| |
| index = iosapic_alloc(); |
| iosapic_lists[index].addr = addr; |
| iosapic_lists[index].gsi_base = gsi_base; |
| iosapic_lists[index].num_rte = num_rte; |
| #ifdef CONFIG_NUMA |
| iosapic_lists[index].node = MAX_NUMNODES; |
| #endif |
| spin_lock_init(&iosapic_lists[index].lock); |
| spin_unlock_irqrestore(&iosapic_lock, flags); |
| |
| if ((gsi_base == 0) && pcat_compat) { |
| /* |
| * Map the legacy ISA devices into the IOSAPIC data. Some of |
| * these may get reprogrammed later on with data from the ACPI |
| * Interrupt Source Override table. |
| */ |
| for (isa_irq = 0; isa_irq < 16; ++isa_irq) |
| iosapic_override_isa_irq(isa_irq, isa_irq, |
| IOSAPIC_POL_HIGH, |
| IOSAPIC_EDGE); |
| } |
| return 0; |
| } |
| |
| #ifdef CONFIG_HOTPLUG |
| int |
| iosapic_remove (unsigned int gsi_base) |
| { |
| int index, err = 0; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&iosapic_lock, flags); |
| index = find_iosapic(gsi_base); |
| if (index < 0) { |
| printk(KERN_WARNING "%s: No IOSAPIC for GSI base %u\n", |
| __func__, gsi_base); |
| goto out; |
| } |
| |
| if (iosapic_lists[index].rtes_inuse) { |
| err = -EBUSY; |
| printk(KERN_WARNING "%s: IOSAPIC for GSI base %u is busy\n", |
| __func__, gsi_base); |
| goto out; |
| } |
| |
| iounmap(iosapic_lists[index].addr); |
| iosapic_free(index); |
| out: |
| spin_unlock_irqrestore(&iosapic_lock, flags); |
| return err; |
| } |
| #endif /* CONFIG_HOTPLUG */ |
| |
| #ifdef CONFIG_NUMA |
| void __devinit |
| map_iosapic_to_node(unsigned int gsi_base, int node) |
| { |
| int index; |
| |
| index = find_iosapic(gsi_base); |
| if (index < 0) { |
| printk(KERN_WARNING "%s: No IOSAPIC for GSI %u\n", |
| __func__, gsi_base); |
| return; |
| } |
| iosapic_lists[index].node = node; |
| return; |
| } |
| #endif |
| |
| static int __init iosapic_enable_kmalloc (void) |
| { |
| iosapic_kmalloc_ok = 1; |
| return 0; |
| } |
| core_initcall (iosapic_enable_kmalloc); |