diff options
Diffstat (limited to 'arch/powerpc/platforms/pseries/xics.c')
| -rw-r--r-- | arch/powerpc/platforms/pseries/xics.c | 883 |
1 files changed, 0 insertions, 883 deletions
diff --git a/arch/powerpc/platforms/pseries/xics.c b/arch/powerpc/platforms/pseries/xics.c deleted file mode 100644 index a977f200db8..00000000000 --- a/arch/powerpc/platforms/pseries/xics.c +++ /dev/null @@ -1,883 +0,0 @@ -/* - * arch/powerpc/platforms/pseries/xics.c - * - * Copyright 2000 IBM Corporation. - * - * This program is free software; you can redistribute it and/or - * modify it under the terms of the GNU General Public License - * as published by the Free Software Foundation; either version - * 2 of the License, or (at your option) any later version. - */ - -#undef DEBUG - -#include <linux/types.h> -#include <linux/threads.h> -#include <linux/kernel.h> -#include <linux/irq.h> -#include <linux/smp.h> -#include <linux/interrupt.h> -#include <linux/signal.h> -#include <linux/init.h> -#include <linux/gfp.h> -#include <linux/radix-tree.h> -#include <linux/cpu.h> - -#include <asm/firmware.h> -#include <asm/prom.h> -#include <asm/io.h> -#include <asm/pgtable.h> -#include <asm/smp.h> -#include <asm/rtas.h> -#include <asm/hvcall.h> -#include <asm/machdep.h> -#include <asm/i8259.h> - -#include "xics.h" -#include "plpar_wrappers.h" - -#define XICS_IPI 2 -#define XICS_IRQ_SPURIOUS 0 - -/* Want a priority other than 0. Various HW issues require this. */ -#define DEFAULT_PRIORITY 5 - -/* - * Mark IPIs as higher priority so we can take them inside interrupts that - * arent marked IRQF_DISABLED - */ -#define IPI_PRIORITY 4 - -struct xics_ipl { - union { - u32 word; - u8 bytes[4]; - } xirr_poll; - union { - u32 word; - u8 bytes[4]; - } xirr; - u32 dummy; - union { - u32 word; - u8 bytes[4]; - } qirr; -}; - -static struct xics_ipl __iomem *xics_per_cpu[NR_CPUS]; - -static unsigned int default_server = 0xFF; -static unsigned int default_distrib_server = 0; -static unsigned int interrupt_server_size = 8; - -static struct irq_host *xics_host; - -/* - * XICS only has a single IPI, so encode the messages per CPU - */ -struct xics_ipi_struct xics_ipi_message[NR_CPUS] __cacheline_aligned; - -/* RTAS service tokens */ -static int ibm_get_xive; -static int ibm_set_xive; -static int ibm_int_on; -static int ibm_int_off; - - -/* Direct HW low level accessors */ - - -static inline unsigned int direct_xirr_info_get(void) -{ - int cpu = smp_processor_id(); - - return in_be32(&xics_per_cpu[cpu]->xirr.word); -} - -static inline void direct_xirr_info_set(int value) -{ - int cpu = smp_processor_id(); - - out_be32(&xics_per_cpu[cpu]->xirr.word, value); -} - -static inline void direct_cppr_info(u8 value) -{ - int cpu = smp_processor_id(); - - out_8(&xics_per_cpu[cpu]->xirr.bytes[0], value); -} - -static inline void direct_qirr_info(int n_cpu, u8 value) -{ - out_8(&xics_per_cpu[n_cpu]->qirr.bytes[0], value); -} - - -/* LPAR low level accessors */ - - -static inline unsigned int lpar_xirr_info_get(void) -{ - unsigned long lpar_rc; - unsigned long return_value; - - lpar_rc = plpar_xirr(&return_value); - if (lpar_rc != H_SUCCESS) - panic(" bad return code xirr - rc = %lx \n", lpar_rc); - return (unsigned int)return_value; -} - -static inline void lpar_xirr_info_set(int value) -{ - unsigned long lpar_rc; - unsigned long val64 = value & 0xffffffff; - - lpar_rc = plpar_eoi(val64); - if (lpar_rc != H_SUCCESS) - panic("bad return code EOI - rc = %ld, value=%lx\n", lpar_rc, - val64); -} - -static inline void lpar_cppr_info(u8 value) -{ - unsigned long lpar_rc; - - lpar_rc = plpar_cppr(value); - if (lpar_rc != H_SUCCESS) - panic("bad return code cppr - rc = %lx\n", lpar_rc); -} - -static inline void lpar_qirr_info(int n_cpu , u8 value) -{ - unsigned long lpar_rc; - - lpar_rc = plpar_ipi(get_hard_smp_processor_id(n_cpu), value); - if (lpar_rc != H_SUCCESS) - panic("bad return code qirr - rc = %lx\n", lpar_rc); -} - - -/* High level handlers and init code */ - -static void xics_update_irq_servers(void) -{ - int i, j; - struct device_node *np; - u32 ilen; - const u32 *ireg, *isize; - u32 hcpuid; - - /* Find the server numbers for the boot cpu. */ - np = of_get_cpu_node(boot_cpuid, NULL); - BUG_ON(!np); - - ireg = of_get_property(np, "ibm,ppc-interrupt-gserver#s", &ilen); - if (!ireg) { - of_node_put(np); - return; - } - - i = ilen / sizeof(int); - hcpuid = get_hard_smp_processor_id(boot_cpuid); - - /* Global interrupt distribution server is specified in the last - * entry of "ibm,ppc-interrupt-gserver#s" property. Get the last - * entry fom this property for current boot cpu id and use it as - * default distribution server - */ - for (j = 0; j < i; j += 2) { - if (ireg[j] == hcpuid) { - default_server = hcpuid; - default_distrib_server = ireg[j+1]; - - isize = of_get_property(np, - "ibm,interrupt-server#-size", NULL); - if (isize) - interrupt_server_size = *isize; - } - } - - of_node_put(np); -} - -#ifdef CONFIG_SMP -static int get_irq_server(unsigned int virq, unsigned int strict_check) -{ - int server; - /* For the moment only implement delivery to all cpus or one cpu */ - cpumask_t cpumask = irq_desc[virq].affinity; - cpumask_t tmp = CPU_MASK_NONE; - - if (! cpu_isset(default_server, cpu_online_map)) - xics_update_irq_servers(); - - if (!distribute_irqs) - return default_server; - - if (!cpus_equal(cpumask, CPU_MASK_ALL)) { - cpus_and(tmp, cpu_online_map, cpumask); - - server = first_cpu(tmp); - - if (server < NR_CPUS) - return get_hard_smp_processor_id(server); - - if (strict_check) - return -1; - } - - if (cpus_equal(cpu_online_map, cpu_present_map)) - return default_distrib_server; - - return default_server; -} -#else -static int get_irq_server(unsigned int virq, unsigned int strict_check) -{ - return default_server; -} -#endif - - -static void xics_unmask_irq(unsigned int virq) -{ - unsigned int irq; - int call_status; - int server; - - pr_debug("xics: unmask virq %d\n", virq); - - irq = (unsigned int)irq_map[virq].hwirq; - pr_debug(" -> map to hwirq 0x%x\n", irq); - if (irq == XICS_IPI || irq == XICS_IRQ_SPURIOUS) - return; - - server = get_irq_server(virq, 0); - - call_status = rtas_call(ibm_set_xive, 3, 1, NULL, irq, server, - DEFAULT_PRIORITY); - if (call_status != 0) { - printk(KERN_ERR "xics_enable_irq: irq=%u: ibm_set_xive " - "returned %d\n", irq, call_status); - printk("set_xive %x, server %x\n", ibm_set_xive, server); - return; - } - - /* Now unmask the interrupt (often a no-op) */ - call_status = rtas_call(ibm_int_on, 1, 1, NULL, irq); - if (call_status != 0) { - printk(KERN_ERR "xics_enable_irq: irq=%u: ibm_int_on " - "returned %d\n", irq, call_status); - return; - } -} - -static void xics_mask_real_irq(unsigned int irq) -{ - int call_status; - - if (irq == XICS_IPI) - return; - - call_status = rtas_call(ibm_int_off, 1, 1, NULL, irq); - if (call_status != 0) { - printk(KERN_ERR "xics_disable_real_irq: irq=%u: " - "ibm_int_off returned %d\n", irq, call_status); - return; - } - - /* Have to set XIVE to 0xff to be able to remove a slot */ - call_status = rtas_call(ibm_set_xive, 3, 1, NULL, irq, - default_server, 0xff); - if (call_status != 0) { - printk(KERN_ERR "xics_disable_irq: irq=%u: ibm_set_xive(0xff)" - " returned %d\n", irq, call_status); - return; - } -} - -static void xics_mask_irq(unsigned int virq) -{ - unsigned int irq; - - pr_debug("xics: mask virq %d\n", virq); - - irq = (unsigned int)irq_map[virq].hwirq; - if (irq == XICS_IPI || irq == XICS_IRQ_SPURIOUS) - return; - xics_mask_real_irq(irq); -} - -static unsigned int xics_startup(unsigned int virq) -{ - unsigned int irq; - - /* force a reverse mapping of the interrupt so it gets in the cache */ - irq = (unsigned int)irq_map[virq].hwirq; - irq_radix_revmap(xics_host, irq); - - /* unmask it */ - xics_unmask_irq(virq); - return 0; -} - -static void xics_eoi_direct(unsigned int virq) -{ - unsigned int irq = (unsigned int)irq_map[virq].hwirq; - - iosync(); - direct_xirr_info_set((0xff << 24) | irq); -} - - -static void xics_eoi_lpar(unsigned int virq) -{ - unsigned int irq = (unsigned int)irq_map[virq].hwirq; - - iosync(); - lpar_xirr_info_set((0xff << 24) | irq); -} - -static inline unsigned int xics_remap_irq(unsigned int vec) -{ - unsigned int irq; - - vec &= 0x00ffffff; - - if (vec == XICS_IRQ_SPURIOUS) - return NO_IRQ; - irq = irq_radix_revmap(xics_host, vec); - if (likely(irq != NO_IRQ)) - return irq; - - printk(KERN_ERR "Interrupt %u (real) is invalid," - " disabling it.\n", vec); - xics_mask_real_irq(vec); - return NO_IRQ; -} - -static unsigned int xics_get_irq_direct(void) -{ - return xics_remap_irq(direct_xirr_info_get()); -} - -static unsigned int xics_get_irq_lpar(void) -{ - return xics_remap_irq(lpar_xirr_info_get()); -} - -#ifdef CONFIG_SMP - -static irqreturn_t xics_ipi_dispatch(int cpu) -{ - WARN_ON(cpu_is_offline(cpu)); - - while (xics_ipi_message[cpu].value) { - if (test_and_clear_bit(PPC_MSG_CALL_FUNCTION, - &xics_ipi_message[cpu].value)) { - mb(); - smp_message_recv(PPC_MSG_CALL_FUNCTION); - } - if (test_and_clear_bit(PPC_MSG_RESCHEDULE, - &xics_ipi_message[cpu].value)) { - mb(); - smp_message_recv(PPC_MSG_RESCHEDULE); - } -#if 0 - if (test_and_clear_bit(PPC_MSG_MIGRATE_TASK, - &xics_ipi_message[cpu].value)) { - mb(); - smp_message_recv(PPC_MSG_MIGRATE_TASK); - } -#endif -#if defined(CONFIG_DEBUGGER) || defined(CONFIG_KEXEC) - if (test_and_clear_bit(PPC_MSG_DEBUGGER_BREAK, - &xics_ipi_message[cpu].value)) { - mb(); - smp_message_recv(PPC_MSG_DEBUGGER_BREAK); - } -#endif - } - return IRQ_HANDLED; -} - -static irqreturn_t xics_ipi_action_direct(int irq, void *dev_id) -{ - int cpu = smp_processor_id(); - - direct_qirr_info(cpu, 0xff); - - return xics_ipi_dispatch(cpu); -} - -static irqreturn_t xics_ipi_action_lpar(int irq, void *dev_id) -{ - int cpu = smp_processor_id(); - - lpar_qirr_info(cpu, 0xff); - - return xics_ipi_dispatch(cpu); -} - -void xics_cause_IPI(int cpu) -{ - if (firmware_has_feature(FW_FEATURE_LPAR)) - lpar_qirr_info(cpu, IPI_PRIORITY); - else - direct_qirr_info(cpu, IPI_PRIORITY); -} - -#endif /* CONFIG_SMP */ - -static void xics_set_cpu_priority(unsigned char cppr) -{ - if (firmware_has_feature(FW_FEATURE_LPAR)) - lpar_cppr_info(cppr); - else - direct_cppr_info(cppr); - iosync(); -} - -static void xics_set_affinity(unsigned int virq, cpumask_t cpumask) -{ - unsigned int irq; - int status; - int xics_status[2]; - int irq_server; - - irq = (unsigned int)irq_map[virq].hwirq; - if (irq == XICS_IPI || irq == XICS_IRQ_SPURIOUS) - return; - - status = rtas_call(ibm_get_xive, 1, 3, xics_status, irq); - - if (status) { - printk(KERN_ERR "xics_set_affinity: irq=%u ibm,get-xive " - "returns %d\n", irq, status); - return; - } - - /* - * For the moment only implement delivery to all cpus or one cpu. - * Get current irq_server for the given irq - */ - irq_server = get_irq_server(virq, 1); - if (irq_server == -1) { - char cpulist[128]; - cpumask_scnprintf(cpulist, sizeof(cpulist), cpumask); - printk(KERN_WARNING "xics_set_affinity: No online cpus in " - "the mask %s for irq %d\n", cpulist, virq); - return; - } - - status = rtas_call(ibm_set_xive, 3, 1, NULL, - irq, irq_server, xics_status[1]); - - if (status) { - printk(KERN_ERR "xics_set_affinity: irq=%u ibm,set-xive " - "returns %d\n", irq, status); - return; - } -} - -void xics_setup_cpu(void) -{ - xics_set_cpu_priority(0xff); - - /* - * Put the calling processor into the GIQ. This is really only - * necessary from a secondary thread as the OF start-cpu interface - * performs this function for us on primary threads. - * - * XXX: undo of teardown on kexec needs this too, as may hotplug - */ - rtas_set_indicator_fast(GLOBAL_INTERRUPT_QUEUE, - (1UL << interrupt_server_size) - 1 - default_distrib_server, 1); -} - - -static struct irq_chip xics_pic_direct = { - .typename = " XICS ", - .startup = xics_startup, - .mask = xics_mask_irq, - .unmask = xics_unmask_irq, - .eoi = xics_eoi_direct, - .set_affinity = xics_set_affinity -}; - - -static struct irq_chip xics_pic_lpar = { - .typename = " XICS ", - .startup = xics_startup, - .mask = xics_mask_irq, - .unmask = xics_unmask_irq, - .eoi = xics_eoi_lpar, - .set_affinity = xics_set_affinity -}; - - -static int xics_host_match(struct irq_host *h, struct device_node *node) -{ - /* IBM machines have interrupt parents of various funky types for things - * like vdevices, events, etc... The trick we use here is to match - * everything here except the legacy 8259 which is compatible "chrp,iic" - */ - return !of_device_is_compatible(node, "chrp,iic"); -} - -static int xics_host_map_direct(struct irq_host *h, unsigned int virq, - irq_hw_number_t hw) -{ - pr_debug("xics: map_direct virq %d, hwirq 0x%lx\n", virq, hw); - - get_irq_desc(virq)->status |= IRQ_LEVEL; - set_irq_chip_and_handler(virq, &xics_pic_direct, handle_fasteoi_irq); - return 0; -} - -static int xics_host_map_lpar(struct irq_host *h, unsigned int virq, - irq_hw_number_t hw) -{ - pr_debug("xics: map_direct virq %d, hwirq 0x%lx\n", virq, hw); - - get_irq_desc(virq)->status |= IRQ_LEVEL; - set_irq_chip_and_handler(virq, &xics_pic_lpar, handle_fasteoi_irq); - return 0; -} - -static int xics_host_xlate(struct irq_host *h, struct device_node *ct, - u32 *intspec, unsigned int intsize, - irq_hw_number_t *out_hwirq, unsigned int *out_flags) - -{ - /* Current xics implementation translates everything - * to level. It is not technically right for MSIs but this - * is irrelevant at this point. We might get smarter in the future - */ - *out_hwirq = intspec[0]; - *out_flags = IRQ_TYPE_LEVEL_LOW; - - return 0; -} - -static struct irq_host_ops xics_host_direct_ops = { - .match = xics_host_match, - .map = xics_host_map_direct, - .xlate = xics_host_xlate, -}; - -static struct irq_host_ops xics_host_lpar_ops = { - .match = xics_host_match, - .map = xics_host_map_lpar, - .xlate = xics_host_xlate, -}; - -static void __init xics_init_host(void) -{ - struct irq_host_ops *ops; - - if (firmware_has_feature(FW_FEATURE_LPAR)) - ops = &xics_host_lpar_ops; - else - ops = &xics_host_direct_ops; - xics_host = irq_alloc_host(NULL, IRQ_HOST_MAP_TREE, 0, ops, - XICS_IRQ_SPURIOUS); - BUG_ON(xics_host == NULL); - irq_set_default_host(xics_host); -} - -static void __init xics_map_one_cpu(int hw_id, unsigned long addr, - unsigned long size) -{ -#ifdef CONFIG_SMP - int i; - - /* This may look gross but it's good enough for now, we don't quite - * have a hard -> linux processor id matching. - */ - for_each_possible_cpu(i) { - if (!cpu_present(i)) - continue; - if (hw_id == get_hard_smp_processor_id(i)) { - xics_per_cpu[i] = ioremap(addr, size); - return; - } - } -#else - if (hw_id != 0) - return; - xics_per_cpu[0] = ioremap(addr, size); -#endif /* CONFIG_SMP */ -} - -static void __init xics_init_one_node(struct device_node *np, - unsigned int *indx) -{ - unsigned int ilen; - const u32 *ireg; - - /* This code does the theorically broken assumption that the interrupt - * server numbers are the same as the hard CPU numbers. - * This happens to be the case so far but we are playing with fire... - * should be fixed one of these days. -BenH. - */ - ireg = of_get_property(np, "ibm,interrupt-server-ranges", NULL); - - /* Do that ever happen ? we'll know soon enough... but even good'old - * f80 does have that property .. - */ - WARN_ON(ireg == NULL); - if (ireg) { - /* - * set node starting index for this node - */ - *indx = *ireg; - } - ireg = of_get_property(np, "reg", &ilen); - if (!ireg) - panic("xics_init_IRQ: can't find interrupt reg property"); - - while (ilen >= (4 * sizeof(u32))) { - unsigned long addr, size; - - /* XXX Use proper OF parsing code here !!! */ - addr = (unsigned long)*ireg++ << 32; - ilen -= sizeof(u32); - addr |= *ireg++; - ilen -= sizeof(u32); - size = (unsigned long)*ireg++ << 32; - ilen -= sizeof(u32); - size |= *ireg++; - ilen -= sizeof(u32); - xics_map_one_cpu(*indx, addr, size); - (*indx)++; - } -} - - -static void __init xics_setup_8259_cascade(void) -{ - struct device_node *np, *old, *found = NULL; - int cascade, naddr; - const u32 *addrp; - unsigned long intack = 0; - - for_each_node_by_type(np, "interrupt-controller") - if (of_device_is_compatible(np, "chrp,iic")) { - found = np; - break; - } - if (found == NULL) { - printk(KERN_DEBUG "xics: no ISA interrupt controller\n"); - return; - } - cascade = irq_of_parse_and_map(found, 0); - if (cascade == NO_IRQ) { - printk(KERN_ERR "xics: failed to map cascade interrupt"); - return; - } - pr_debug("xics: cascade mapped to irq %d\n", cascade); - - for (old = of_node_get(found); old != NULL ; old = np) { - np = of_get_parent(old); - of_node_put(old); - if (np == NULL) - break; - if (strcmp(np->name, "pci") != 0) - continue; - addrp = of_get_property(np, "8259-interrupt-acknowledge", NULL); - if (addrp == NULL) - continue; - naddr = of_n_addr_cells(np); - intack = addrp[naddr-1]; - if (naddr > 1) - intack |= ((unsigned long)addrp[naddr-2]) << 32; - } - if (intack) - printk(KERN_DEBUG "xics: PCI 8259 intack at 0x%016lx\n", intack); - i8259_init(found, intack); - of_node_put(found); - set_irq_chained_handler(cascade, pseries_8259_cascade); -} - -void __init xics_init_IRQ(void) -{ - struct device_node *np; - u32 indx = 0; - int found = 0; - - ppc64_boot_msg(0x20, "XICS Init"); - - ibm_get_xive = rtas_token("ibm,get-xive"); - ibm_set_xive = rtas_token("ibm,set-xive"); - ibm_int_on = rtas_token("ibm,int-on"); - ibm_int_off = rtas_token("ibm,int-off"); - - for_each_node_by_type(np, "PowerPC-External-Interrupt-Presentation") { - found = 1; - if (firmware_has_feature(FW_FEATURE_LPAR)) - break; - xics_init_one_node(np, &indx); - } - if (found == 0) - return; - - xics_init_host(); - xics_update_irq_servers(); - - if (firmware_has_feature(FW_FEATURE_LPAR)) - ppc_md.get_irq = xics_get_irq_lpar; - else - ppc_md.get_irq = xics_get_irq_direct; - - xics_setup_cpu(); - - xics_setup_8259_cascade(); - - ppc64_boot_msg(0x21, "XICS Done"); -} - - -#ifdef CONFIG_SMP -void xics_request_IPIs(void) -{ - unsigned int ipi; - int rc; - - ipi = irq_create_mapping(xics_host, XICS_IPI); - BUG_ON(ipi == NO_IRQ); - - /* - * IPIs are marked IRQF_DISABLED as they must run with irqs - * disabled - */ - set_irq_handler(ipi, handle_percpu_irq); - if (firmware_has_feature(FW_FEATURE_LPAR)) - rc = request_irq(ipi, xics_ipi_action_lpar, IRQF_DISABLED, - "IPI", NULL); - else - rc = request_irq(ipi, xics_ipi_action_direct, IRQF_DISABLED, - "IPI", NULL); - BUG_ON(rc); -} -#endif /* CONFIG_SMP */ - -void xics_teardown_cpu(void) -{ - int cpu = smp_processor_id(); - - xics_set_cpu_priority(0); - - /* - * Clear IPI - */ - if (firmware_has_feature(FW_FEATURE_LPAR)) - lpar_qirr_info(cpu, 0xff); - else - direct_qirr_info(cpu, 0xff); -} - -void xics_kexec_teardown_cpu(int secondary) -{ - unsigned int ipi; - struct irq_desc *desc; - - xics_teardown_cpu(); - - /* - * we need to EOI the IPI - * - * probably need to check all the other interrupts too - * should we be flagging idle loop instead? - * or creating some task to be scheduled? - */ - - ipi = irq_find_mapping(xics_host, XICS_IPI); - if (ipi == XICS_IRQ_SPURIOUS) - return; - desc = get_irq_desc(ipi); - if (desc->chip && desc->chip->eoi) - desc->chip->eoi(ipi); - - /* - * Some machines need to have at least one cpu in the GIQ, - * so leave the master cpu in the group. - */ - if (secondary) - rtas_set_indicator_fast(GLOBAL_INTERRUPT_QUEUE, - (1UL << interrupt_server_size) - 1 - - default_distrib_server, 0); -} - -#ifdef CONFIG_HOTPLUG_CPU - -/* Interrupts are disabled. */ -void xics_migrate_irqs_away(void) -{ - int status; - int cpu = smp_processor_id(), hw_cpu = hard_smp_processor_id(); - unsigned int irq, virq; - - /* Reject any interrupt that was queued to us... */ - xics_set_cpu_priority(0); - - /* remove ourselves from the global interrupt queue */ - status = rtas_set_indicator_fast(GLOBAL_INTERRUPT_QUEUE, - (1UL << interrupt_server_size) - 1 - default_distrib_server, 0); - WARN_ON(status < 0); - - /* Allow IPIs again... */ - xics_set_cpu_priority(DEFAULT_PRIORITY); - - for_each_irq(virq) { - struct irq_desc *desc; - int xics_status[2]; - unsigned long flags; - - /* We cant set affinity on ISA interrupts */ - if (virq < NUM_ISA_INTERRUPTS) - continue; - if (irq_map[virq].host != xics_host) - continue; - irq = (unsigned int)irq_map[virq].hwirq; - /* We need to get IPIs still. */ - if (irq == XICS_IPI || irq == XICS_IRQ_SPURIOUS) - continue; - desc = get_irq_desc(virq); - - /* We only need to migrate enabled IRQS */ - if (desc == NULL || desc->chip == NULL - || desc->action == NULL - || desc->chip->set_affinity == NULL) - continue; - - spin_lock_irqsave(&desc->lock, flags); - - status = rtas_call(ibm_get_xive, 1, 3, xics_status, irq); - if (status) { - printk(KERN_ERR "migrate_irqs_away: irq=%u " - "ibm,get-xive returns %d\n", - virq, status); - goto unlock; - } - - /* - * We only support delivery to all cpus or to one cpu. - * The irq has to be migrated only in the single cpu - * case. - */ - if (xics_status[0] != hw_cpu) - goto unlock; - - printk(KERN_WARNING "IRQ %u affinity broken off cpu %u\n", - virq, cpu); - - /* Reset affinity to all cpus */ - irq_desc[virq].affinity = CPU_MASK_ALL; - desc->chip->set_affinity(virq, CPU_MASK_ALL); -unlock: - spin_unlock_irqrestore(&desc->lock, flags); - } -} -#endif |