| /* |
| * 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 describe interrupts. |
| * Now we use "IRQ" only for Linux IRQ's. ISA IRQ (isa_irq) is the only exception in this |
| * source code. |
| */ |
| #include <linux/config.h> |
| |
| #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/smp_lock.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. */ |
| |
| struct iosapic_rte_info { |
| struct list_head rte_list; /* node in list of RTEs sharing the same vector */ |
| char __iomem *addr; /* base address of IOSAPIC */ |
| unsigned int gsi_base; /* first GSI assigned to this IOSAPIC */ |
| char rte_index; /* IOSAPIC RTE index */ |
| int refcnt; /* reference counter */ |
| unsigned int flags; /* flags */ |
| } ____cacheline_aligned; |
| |
| static struct iosapic_intr_info { |
| struct list_head rtes; /* RTEs using this vector (empty => not an IOSAPIC interrupt) */ |
| int count; /* # of RTEs that shares this vector */ |
| 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[IA64_NUM_VECTORS]; |
| |
| static struct iosapic { |
| char __iomem *addr; /* base address of IOSAPIC */ |
| unsigned int gsi_base; /* first GSI assigned to this IOSAPIC */ |
| unsigned short num_rte; /* number of RTE in this IOSAPIC */ |
| int rtes_inuse; /* # of RTEs in use on this IOSAPIC */ |
| #ifdef CONFIG_NUMA |
| unsigned short node; /* numa node association via pxm */ |
| #endif |
| } iosapic_lists[NR_IOSAPICS]; |
| |
| static unsigned char pcat_compat __devinitdata; /* 8259 compatibility flag */ |
| |
| static int iosapic_kmalloc_ok; |
| static LIST_HEAD(free_rte_list); |
| |
| /* |
| * 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_vector (unsigned int gsi) |
| { |
| struct iosapic_intr_info *info; |
| struct iosapic_rte_info *rte; |
| |
| for (info = iosapic_intr_info; info < iosapic_intr_info + IA64_NUM_VECTORS; ++info) |
| list_for_each_entry(rte, &info->rtes, rte_list) |
| if (rte->gsi_base + rte->rte_index == gsi) |
| return info - iosapic_intr_info; |
| return -1; |
| } |
| |
| /* |
| * Translate GSI number to the corresponding IA-64 interrupt vector. If no |
| * entry exists, return -1. |
| */ |
| inline int |
| gsi_to_vector (unsigned int gsi) |
| { |
| return _gsi_to_vector(gsi); |
| } |
| |
| int |
| gsi_to_irq (unsigned int gsi) |
| { |
| unsigned long flags; |
| int irq; |
| /* |
| * XXX fix me: this assumes an identity mapping vetween IA-64 vector and Linux irq |
| * numbers... |
| */ |
| spin_lock_irqsave(&iosapic_lock, flags); |
| { |
| irq = _gsi_to_vector(gsi); |
| } |
| spin_unlock_irqrestore(&iosapic_lock, flags); |
| |
| return irq; |
| } |
| |
| static struct iosapic_rte_info *gsi_vector_to_rte(unsigned int gsi, unsigned int vec) |
| { |
| struct iosapic_rte_info *rte; |
| |
| list_for_each_entry(rte, &iosapic_intr_info[vec].rtes, rte_list) |
| if (rte->gsi_base + rte->rte_index == gsi) |
| return rte; |
| return NULL; |
| } |
| |
| static void |
| set_rte (unsigned int gsi, unsigned int vector, unsigned int dest, int mask) |
| { |
| unsigned long pol, trigger, dmode; |
| u32 low32, high32; |
| char __iomem *addr; |
| int rte_index; |
| char redir; |
| struct iosapic_rte_info *rte; |
| |
| DBG(KERN_DEBUG"IOSAPIC: routing vector %d to 0x%x\n", vector, dest); |
| |
| rte = gsi_vector_to_rte(gsi, vector); |
| if (!rte) |
| return; /* not an IOSAPIC interrupt */ |
| |
| rte_index = rte->rte_index; |
| addr = rte->addr; |
| pol = iosapic_intr_info[vector].polarity; |
| trigger = iosapic_intr_info[vector].trigger; |
| dmode = iosapic_intr_info[vector].dmode; |
| |
| redir = (dmode == IOSAPIC_LOWEST_PRIORITY) ? 1 : 0; |
| |
| #ifdef CONFIG_SMP |
| { |
| unsigned int irq; |
| |
| for (irq = 0; irq < NR_IRQS; ++irq) |
| if (irq_to_vector(irq) == vector) { |
| set_irq_affinity_info(irq, (int)(dest & 0xffff), redir); |
| break; |
| } |
| } |
| #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(addr, IOSAPIC_RTE_HIGH(rte_index), high32); |
| iosapic_write(addr, IOSAPIC_RTE_LOW(rte_index), low32); |
| iosapic_intr_info[vector].low32 = low32; |
| iosapic_intr_info[vector].dest = dest; |
| } |
| |
| static void |
| nop (unsigned int vector) |
| { |
| /* do nothing... */ |
| } |
| |
| static void |
| mask_irq (unsigned int irq) |
| { |
| unsigned long flags; |
| char __iomem *addr; |
| u32 low32; |
| int rte_index; |
| ia64_vector vec = irq_to_vector(irq); |
| struct iosapic_rte_info *rte; |
| |
| if (list_empty(&iosapic_intr_info[vec].rtes)) |
| return; /* not an IOSAPIC interrupt! */ |
| |
| spin_lock_irqsave(&iosapic_lock, flags); |
| { |
| /* set only the mask bit */ |
| low32 = iosapic_intr_info[vec].low32 |= IOSAPIC_MASK; |
| list_for_each_entry(rte, &iosapic_intr_info[vec].rtes, rte_list) { |
| addr = rte->addr; |
| rte_index = rte->rte_index; |
| iosapic_write(addr, IOSAPIC_RTE_LOW(rte_index), low32); |
| } |
| } |
| spin_unlock_irqrestore(&iosapic_lock, flags); |
| } |
| |
| static void |
| unmask_irq (unsigned int irq) |
| { |
| unsigned long flags; |
| char __iomem *addr; |
| u32 low32; |
| int rte_index; |
| ia64_vector vec = irq_to_vector(irq); |
| struct iosapic_rte_info *rte; |
| |
| if (list_empty(&iosapic_intr_info[vec].rtes)) |
| return; /* not an IOSAPIC interrupt! */ |
| |
| spin_lock_irqsave(&iosapic_lock, flags); |
| { |
| low32 = iosapic_intr_info[vec].low32 &= ~IOSAPIC_MASK; |
| list_for_each_entry(rte, &iosapic_intr_info[vec].rtes, rte_list) { |
| addr = rte->addr; |
| rte_index = rte->rte_index; |
| iosapic_write(addr, IOSAPIC_RTE_LOW(rte_index), low32); |
| } |
| } |
| spin_unlock_irqrestore(&iosapic_lock, flags); |
| } |
| |
| |
| static void |
| iosapic_set_affinity (unsigned int irq, cpumask_t mask) |
| { |
| #ifdef CONFIG_SMP |
| unsigned long flags; |
| u32 high32, low32; |
| int dest, rte_index; |
| char __iomem *addr; |
| int redir = (irq & IA64_IRQ_REDIRECTED) ? 1 : 0; |
| ia64_vector vec; |
| struct iosapic_rte_info *rte; |
| |
| irq &= (~IA64_IRQ_REDIRECTED); |
| vec = irq_to_vector(irq); |
| |
| if (cpus_empty(mask)) |
| return; |
| |
| dest = cpu_physical_id(first_cpu(mask)); |
| |
| if (list_empty(&iosapic_intr_info[vec].rtes)) |
| return; /* not an IOSAPIC interrupt */ |
| |
| set_irq_affinity_info(irq, dest, redir); |
| |
| /* dest contains both id and eid */ |
| high32 = dest << IOSAPIC_DEST_SHIFT; |
| |
| spin_lock_irqsave(&iosapic_lock, flags); |
| { |
| low32 = iosapic_intr_info[vec].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); |
| |
| iosapic_intr_info[vec].low32 = low32; |
| iosapic_intr_info[vec].dest = dest; |
| list_for_each_entry(rte, &iosapic_intr_info[vec].rtes, rte_list) { |
| addr = rte->addr; |
| rte_index = rte->rte_index; |
| iosapic_write(addr, IOSAPIC_RTE_HIGH(rte_index), high32); |
| iosapic_write(addr, IOSAPIC_RTE_LOW(rte_index), low32); |
| } |
| } |
| spin_unlock_irqrestore(&iosapic_lock, flags); |
| #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; |
| |
| move_irq(irq); |
| list_for_each_entry(rte, &iosapic_intr_info[vec].rtes, rte_list) |
| iosapic_eoi(rte->addr, vec); |
| } |
| |
| #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 |
| |
| struct hw_interrupt_type irq_type_iosapic_level = { |
| .typename = "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, |
| .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_descp(irq); |
| |
| move_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 |
| |
| struct hw_interrupt_type irq_type_iosapic_edge = { |
| .typename = "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, |
| .set_affinity = iosapic_set_affinity |
| }; |
| |
| 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_vector (unsigned long trigger, unsigned long pol) |
| { |
| int i, vector = -1, min_count = -1; |
| struct iosapic_intr_info *info; |
| |
| /* |
| * shared vectors for edge-triggered interrupts are not |
| * supported yet |
| */ |
| if (trigger == IOSAPIC_EDGE) |
| return -1; |
| |
| for (i = IA64_FIRST_DEVICE_VECTOR; i <= IA64_LAST_DEVICE_VECTOR; i++) { |
| info = &iosapic_intr_info[i]; |
| if (info->trigger == trigger && info->polarity == pol && |
| (info->dmode == IOSAPIC_FIXED || info->dmode == IOSAPIC_LOWEST_PRIORITY)) { |
| if (min_count == -1 || info->count < min_count) { |
| vector = i; |
| min_count = info->count; |
| } |
| } |
| } |
| if (vector < 0) |
| panic("%s: out of interrupt vectors!\n", __FUNCTION__); |
| |
| return vector; |
| } |
| |
| /* |
| * 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 vector) |
| { |
| int new_vector; |
| |
| if (!list_empty(&iosapic_intr_info[vector].rtes)) { |
| new_vector = assign_irq_vector(AUTO_ASSIGN); |
| printk(KERN_INFO "Reassigning vector %d to %d\n", vector, new_vector); |
| memcpy(&iosapic_intr_info[new_vector], &iosapic_intr_info[vector], |
| sizeof(struct iosapic_intr_info)); |
| INIT_LIST_HEAD(&iosapic_intr_info[new_vector].rtes); |
| list_move(iosapic_intr_info[vector].rtes.next, &iosapic_intr_info[new_vector].rtes); |
| memset(&iosapic_intr_info[vector], 0, sizeof(struct iosapic_intr_info)); |
| iosapic_intr_info[vector].low32 = IOSAPIC_MASK; |
| INIT_LIST_HEAD(&iosapic_intr_info[vector].rtes); |
| } |
| } |
| |
| static struct iosapic_rte_info *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); |
| if (!rte) |
| return NULL; |
| 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 void iosapic_free_rte (struct iosapic_rte_info *rte) |
| { |
| if (rte->flags & RTE_PREALLOCATED) |
| list_add_tail(&rte->rte_list, &free_rte_list); |
| else |
| kfree(rte); |
| } |
| |
| static inline int vector_is_shared (int vector) |
| { |
| return (iosapic_intr_info[vector].count > 1); |
| } |
| |
| static void |
| register_intr (unsigned int gsi, int vector, unsigned char delivery, |
| unsigned long polarity, unsigned long trigger) |
| { |
| irq_desc_t *idesc; |
| struct hw_interrupt_type *irq_type; |
| int rte_index; |
| int index; |
| unsigned long gsi_base; |
| void __iomem *iosapic_address; |
| struct iosapic_rte_info *rte; |
| |
| index = find_iosapic(gsi); |
| if (index < 0) { |
| printk(KERN_WARNING "%s: No IOSAPIC for GSI %u\n", __FUNCTION__, gsi); |
| return; |
| } |
| |
| iosapic_address = iosapic_lists[index].addr; |
| gsi_base = iosapic_lists[index].gsi_base; |
| |
| rte = gsi_vector_to_rte(gsi, vector); |
| if (!rte) { |
| rte = iosapic_alloc_rte(); |
| if (!rte) { |
| printk(KERN_WARNING "%s: cannot allocate memory\n", __FUNCTION__); |
| return; |
| } |
| |
| rte_index = gsi - gsi_base; |
| rte->rte_index = rte_index; |
| rte->addr = iosapic_address; |
| rte->gsi_base = gsi_base; |
| rte->refcnt++; |
| list_add_tail(&rte->rte_list, &iosapic_intr_info[vector].rtes); |
| iosapic_intr_info[vector].count++; |
| iosapic_lists[index].rtes_inuse++; |
| } |
| else if (vector_is_shared(vector)) { |
| struct iosapic_intr_info *info = &iosapic_intr_info[vector]; |
| if (info->trigger != trigger || info->polarity != polarity) { |
| printk (KERN_WARNING "%s: cannot override the interrupt\n", __FUNCTION__); |
| return; |
| } |
| } |
| |
| iosapic_intr_info[vector].polarity = polarity; |
| iosapic_intr_info[vector].dmode = delivery; |
| iosapic_intr_info[vector].trigger = trigger; |
| |
| if (trigger == IOSAPIC_EDGE) |
| irq_type = &irq_type_iosapic_edge; |
| else |
| irq_type = &irq_type_iosapic_level; |
| |
| idesc = irq_descp(vector); |
| if (idesc->handler != irq_type) { |
| if (idesc->handler != &no_irq_type) |
| printk(KERN_WARNING "%s: changing vector %d from %s to %s\n", |
| __FUNCTION__, vector, idesc->handler->typename, irq_type->typename); |
| idesc->handler = irq_type; |
| } |
| } |
| |
| static unsigned int |
| get_target_cpu (unsigned int gsi, int vector) |
| { |
| #ifdef CONFIG_SMP |
| static int cpu = -1; |
| |
| /* |
| * In case of vector shared by multiple RTEs, all RTEs that |
| * share the vector need to use the same destination CPU. |
| */ |
| if (!list_empty(&iosapic_intr_info[vector].rtes)) |
| return iosapic_intr_info[vector].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_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); |
| |
| 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 vector assigment to distribute across cpus in node */ |
| cpu_index = vector % 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)); |
| |
| return cpu_physical_id(cpu); |
| #else |
| return cpu_physical_id(smp_processor_id()); |
| #endif |
| } |
| |
| /* |
| * 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 vector, mask = 1; |
| unsigned int dest; |
| unsigned long flags; |
| struct iosapic_rte_info *rte; |
| u32 low32; |
| again: |
| /* |
| * 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); |
| { |
| vector = gsi_to_vector(gsi); |
| if (vector > 0) { |
| rte = gsi_vector_to_rte(gsi, vector); |
| rte->refcnt++; |
| spin_unlock_irqrestore(&iosapic_lock, flags); |
| return vector; |
| } |
| } |
| spin_unlock_irqrestore(&iosapic_lock, flags); |
| |
| /* If vector is running out, we try to find a sharable vector */ |
| vector = assign_irq_vector_nopanic(AUTO_ASSIGN); |
| if (vector < 0) |
| vector = iosapic_find_sharable_vector(trigger, polarity); |
| |
| spin_lock_irqsave(&irq_descp(vector)->lock, flags); |
| spin_lock(&iosapic_lock); |
| { |
| if (gsi_to_vector(gsi) > 0) { |
| if (list_empty(&iosapic_intr_info[vector].rtes)) |
| free_irq_vector(vector); |
| spin_unlock(&iosapic_lock); |
| spin_unlock_irqrestore(&irq_descp(vector)->lock, flags); |
| goto again; |
| } |
| |
| dest = get_target_cpu(gsi, vector); |
| register_intr(gsi, vector, IOSAPIC_LOWEST_PRIORITY, |
| polarity, trigger); |
| |
| /* |
| * If the vector is shared and already unmasked for |
| * other interrupt sources, don't mask it. |
| */ |
| low32 = iosapic_intr_info[vector].low32; |
| if (vector_is_shared(vector) && !(low32 & IOSAPIC_MASK)) |
| mask = 0; |
| set_rte(gsi, vector, dest, mask); |
| } |
| spin_unlock(&iosapic_lock); |
| spin_unlock_irqrestore(&irq_descp(vector)->lock, flags); |
| |
| 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, vector); |
| |
| return vector; |
| } |
| |
| #ifdef CONFIG_ACPI_DEALLOCATE_IRQ |
| void |
| iosapic_unregister_intr (unsigned int gsi) |
| { |
| unsigned long flags; |
| int irq, vector, 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; |
| } |
| vector = irq_to_vector(irq); |
| |
| idesc = irq_descp(irq); |
| spin_lock_irqsave(&idesc->lock, flags); |
| spin_lock(&iosapic_lock); |
| { |
| if ((rte = gsi_vector_to_rte(gsi, vector)) == NULL) { |
| printk(KERN_ERR "iosapic_unregister_intr(%u) unbalanced\n", gsi); |
| WARN_ON(1); |
| goto out; |
| } |
| |
| if (--rte->refcnt > 0) |
| goto out; |
| |
| /* Mask the interrupt */ |
| low32 = iosapic_intr_info[vector].low32 | IOSAPIC_MASK; |
| iosapic_write(rte->addr, IOSAPIC_RTE_LOW(rte->rte_index), low32); |
| |
| /* Remove the rte entry from the list */ |
| list_del(&rte->rte_list); |
| iosapic_intr_info[vector].count--; |
| iosapic_free_rte(rte); |
| index = find_iosapic(gsi); |
| iosapic_lists[index].rtes_inuse--; |
| WARN_ON(iosapic_lists[index].rtes_inuse < 0); |
| |
| trigger = iosapic_intr_info[vector].trigger; |
| polarity = iosapic_intr_info[vector].polarity; |
| dest = iosapic_intr_info[vector].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, vector); |
| |
| if (list_empty(&iosapic_intr_info[vector].rtes)) { |
| /* Sanity check */ |
| BUG_ON(iosapic_intr_info[vector].count); |
| |
| /* Clear the interrupt controller descriptor */ |
| idesc->handler = &no_irq_type; |
| |
| /* Clear the interrupt information */ |
| memset(&iosapic_intr_info[vector], 0, sizeof(struct iosapic_intr_info)); |
| iosapic_intr_info[vector].low32 |= IOSAPIC_MASK; |
| INIT_LIST_HEAD(&iosapic_intr_info[vector].rtes); |
| |
| if (idesc->action) { |
| printk(KERN_ERR "interrupt handlers still exist on IRQ %u\n", irq); |
| WARN_ON(1); |
| } |
| |
| /* Free the interrupt vector */ |
| free_irq_vector(vector); |
| } |
| } |
| out: |
| spin_unlock(&iosapic_lock); |
| spin_unlock_irqrestore(&idesc->lock, flags); |
| } |
| #endif /* CONFIG_ACPI_DEALLOCATE_IRQ */ |
| |
| /* |
| * ACPI calls this when it finds an entry for a platform interrupt. |
| * Note that the irq_base and IOSAPIC address must be set in iosapic_init(). |
| */ |
| 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 vector, mask = 0; |
| unsigned int dest = ((id << 8) | eid) & 0xffff; |
| |
| switch (int_type) { |
| case ACPI_INTERRUPT_PMI: |
| vector = iosapic_vector; |
| /* |
| * since PMI vector is alloc'd by FW(ACPI) not by kernel, |
| * we need to make sure the vector is available |
| */ |
| iosapic_reassign_vector(vector); |
| delivery = IOSAPIC_PMI; |
| break; |
| case ACPI_INTERRUPT_INIT: |
| vector = assign_irq_vector(AUTO_ASSIGN); |
| delivery = IOSAPIC_INIT; |
| break; |
| case ACPI_INTERRUPT_CPEI: |
| vector = IA64_CPE_VECTOR; |
| delivery = IOSAPIC_LOWEST_PRIORITY; |
| mask = 1; |
| break; |
| default: |
| printk(KERN_ERR "iosapic_register_platform_irq(): invalid int type 0x%x\n", int_type); |
| return -1; |
| } |
| |
| register_intr(gsi, vector, 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, vector, dest, mask); |
| return vector; |
| } |
| |
| |
| /* |
| * ACPI calls this when it finds an entry for a legacy ISA IRQ override. |
| * Note that the gsi_base and IOSAPIC address must be set in iosapic_init(). |
| */ |
| void __init |
| iosapic_override_isa_irq (unsigned int isa_irq, unsigned int gsi, |
| unsigned long polarity, |
| unsigned long trigger) |
| { |
| int vector; |
| unsigned int dest = cpu_physical_id(smp_processor_id()); |
| |
| vector = isa_irq_to_vector(isa_irq); |
| |
| register_intr(gsi, vector, IOSAPIC_LOWEST_PRIORITY, 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, vector, dest, 1); |
| } |
| |
| void __init |
| iosapic_system_init (int system_pcat_compat) |
| { |
| int vector; |
| |
| for (vector = 0; vector < IA64_NUM_VECTORS; ++vector) { |
| iosapic_intr_info[vector].low32 = IOSAPIC_MASK; |
| INIT_LIST_HEAD(&iosapic_intr_info[vector].rtes); /* mark as unused */ |
| } |
| |
| 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", __FUNCTION__); |
| 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", __FUNCTION__); |
| 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_base < base && gsi_end < base) |
| continue;/* OK */ |
| |
| if (gsi_base > end && gsi_end > end) |
| 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); |
| { |
| 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_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", |
| __FUNCTION__, gsi_base); |
| goto out; |
| } |
| |
| if (iosapic_lists[index].rtes_inuse) { |
| err = -EBUSY; |
| printk(KERN_WARNING "%s: IOSAPIC for GSI base %u is busy\n", |
| __FUNCTION__, 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", |
| __FUNCTION__, 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); |