| /* |
| * 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. |
| */ |
| |
| #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/init.h> |
| #include <linux/radix-tree.h> |
| #include <linux/cpu.h> |
| #include <linux/of.h> |
| |
| #include <asm/firmware.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 "xics.h" |
| #include "plpar_wrappers.h" |
| |
| static struct irq_host *xics_host; |
| |
| #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 |
| |
| static unsigned int default_server = 0xFF; |
| static unsigned int default_distrib_server = 0; |
| static unsigned int interrupt_server_size = 8; |
| |
| /* RTAS service tokens */ |
| static int ibm_get_xive; |
| static int ibm_set_xive; |
| static int ibm_int_on; |
| static int ibm_int_off; |
| |
| |
| /* Direct hardware low level accessors */ |
| |
| /* The part of the interrupt presentation layer that we care about */ |
| 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 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(unsigned 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(unsigned int value) |
| { |
| unsigned long lpar_rc; |
| |
| lpar_rc = plpar_eoi(value); |
| if (lpar_rc != H_SUCCESS) |
| panic("bad return code EOI - rc = %ld, value=%x\n", lpar_rc, |
| value); |
| } |
| |
| 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); |
| } |
| |
| |
| /* Interface to generic irq subsystem */ |
| |
| #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 (!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 |
| "%s: ibm_set_xive irq %u server %x returned %d\n", |
| __func__, irq, server, call_status); |
| 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 "%s: ibm_int_on irq=%u returned %d\n", |
| __func__, irq, call_status); |
| return; |
| } |
| } |
| |
| static unsigned int xics_startup(unsigned int virq) |
| { |
| /* unmask it */ |
| xics_unmask_irq(virq); |
| return 0; |
| } |
| |
| 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 "%s: ibm_int_off irq=%u returned %d\n", |
| __func__, 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 "%s: ibm_set_xive(0xff) irq=%u returned %d\n", |
| __func__, 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 void xics_mask_unknown_vec(unsigned int vec) |
| { |
| printk(KERN_ERR "Interrupt %u (real) is invalid, disabling it.\n", vec); |
| xics_mask_real_irq(vec); |
| } |
| |
| static inline unsigned int xics_xirr_vector(unsigned int xirr) |
| { |
| /* |
| * The top byte is the old cppr, to be restored on EOI. |
| * The remaining 24 bits are the vector. |
| */ |
| return xirr & 0x00ffffff; |
| } |
| |
| static unsigned int xics_get_irq_direct(void) |
| { |
| unsigned int xirr = direct_xirr_info_get(); |
| unsigned int vec = xics_xirr_vector(xirr); |
| unsigned int irq; |
| |
| if (vec == XICS_IRQ_SPURIOUS) |
| return NO_IRQ; |
| |
| irq = irq_radix_revmap_lookup(xics_host, vec); |
| if (likely(irq != NO_IRQ)) |
| return irq; |
| |
| /* We don't have a linux mapping, so have rtas mask it. */ |
| xics_mask_unknown_vec(vec); |
| |
| /* We might learn about it later, so EOI it */ |
| direct_xirr_info_set(xirr); |
| return NO_IRQ; |
| } |
| |
| static unsigned int xics_get_irq_lpar(void) |
| { |
| unsigned int xirr = lpar_xirr_info_get(); |
| unsigned int vec = xics_xirr_vector(xirr); |
| unsigned int irq; |
| |
| if (vec == XICS_IRQ_SPURIOUS) |
| return NO_IRQ; |
| |
| irq = irq_radix_revmap_lookup(xics_host, vec); |
| if (likely(irq != NO_IRQ)) |
| return irq; |
| |
| /* We don't have a linux mapping, so have RTAS mask it. */ |
| xics_mask_unknown_vec(vec); |
| |
| /* We might learn about it later, so EOI it */ |
| lpar_xirr_info_set(xirr); |
| return NO_IRQ; |
| } |
| |
| 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 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 "%s: ibm,get-xive irq=%u returns %d\n", |
| __func__, 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 |
| "%s: No online cpus in the mask %s for irq %d\n", |
| __func__, cpulist, virq); |
| return; |
| } |
| |
| status = rtas_call(ibm_set_xive, 3, 1, NULL, |
| irq, irq_server, xics_status[1]); |
| |
| if (status) { |
| printk(KERN_ERR "%s: ibm,set-xive irq=%u returns %d\n", |
| __func__, irq, status); |
| return; |
| } |
| } |
| |
| 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 |
| }; |
| |
| |
| /* Interface to arch irq controller subsystem layer */ |
| |
| /* Points to the irq_chip we're actually using */ |
| static struct irq_chip *xics_irq_chip; |
| |
| 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(struct irq_host *h, unsigned int virq, |
| irq_hw_number_t hw) |
| { |
| pr_debug("xics: map virq %d, hwirq 0x%lx\n", virq, hw); |
| |
| /* Insert the interrupt mapping into the radix tree for fast lookup */ |
| irq_radix_revmap_insert(xics_host, virq, hw); |
| |
| get_irq_desc(virq)->status |= IRQ_LEVEL; |
| set_irq_chip_and_handler(virq, xics_irq_chip, 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_ops = { |
| .match = xics_host_match, |
| .map = xics_host_map, |
| .xlate = xics_host_xlate, |
| }; |
| |
| static void __init xics_init_host(void) |
| { |
| if (firmware_has_feature(FW_FEATURE_LPAR)) |
| xics_irq_chip = &xics_pic_lpar; |
| else |
| xics_irq_chip = &xics_pic_direct; |
| |
| xics_host = irq_alloc_host(NULL, IRQ_HOST_MAP_TREE, 0, &xics_host_ops, |
| XICS_IRQ_SPURIOUS); |
| BUG_ON(xics_host == NULL); |
| irq_set_default_host(xics_host); |
| } |
| |
| |
| /* Inter-processor interrupt support */ |
| |
| #ifdef CONFIG_SMP |
| /* |
| * XICS only has a single IPI, so encode the messages per CPU |
| */ |
| struct xics_ipi_struct { |
| unsigned long value; |
| } ____cacheline_aligned; |
| |
| static struct xics_ipi_struct xics_ipi_message[NR_CPUS] __cacheline_aligned; |
| |
| static inline void smp_xics_do_message(int cpu, int msg) |
| { |
| set_bit(msg, &xics_ipi_message[cpu].value); |
| mb(); |
| if (firmware_has_feature(FW_FEATURE_LPAR)) |
| lpar_qirr_info(cpu, IPI_PRIORITY); |
| else |
| direct_qirr_info(cpu, IPI_PRIORITY); |
| } |
| |
| void smp_xics_message_pass(int target, int msg) |
| { |
| unsigned int i; |
| |
| if (target < NR_CPUS) { |
| smp_xics_do_message(target, msg); |
| } else { |
| for_each_online_cpu(i) { |
| if (target == MSG_ALL_BUT_SELF |
| && i == smp_processor_id()) |
| continue; |
| smp_xics_do_message(i, msg); |
| } |
| } |
| } |
| |
| static irqreturn_t xics_ipi_dispatch(int cpu) |
| { |
| WARN_ON(cpu_is_offline(cpu)); |
| |
| mb(); /* order mmio clearing qirr */ |
| while (xics_ipi_message[cpu].value) { |
| if (test_and_clear_bit(PPC_MSG_CALL_FUNCTION, |
| &xics_ipi_message[cpu].value)) { |
| smp_message_recv(PPC_MSG_CALL_FUNCTION); |
| } |
| if (test_and_clear_bit(PPC_MSG_RESCHEDULE, |
| &xics_ipi_message[cpu].value)) { |
| smp_message_recv(PPC_MSG_RESCHEDULE); |
| } |
| if (test_and_clear_bit(PPC_MSG_CALL_FUNC_SINGLE, |
| &xics_ipi_message[cpu].value)) { |
| smp_message_recv(PPC_MSG_CALL_FUNC_SINGLE); |
| } |
| #if defined(CONFIG_DEBUGGER) || defined(CONFIG_KEXEC) |
| if (test_and_clear_bit(PPC_MSG_DEBUGGER_BREAK, |
| &xics_ipi_message[cpu].value)) { |
| 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); |
| } |
| |
| static void xics_request_ipi(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|IRQF_PERCPU, "IPI", NULL); |
| else |
| rc = request_irq(ipi, xics_ipi_action_direct, |
| IRQF_DISABLED|IRQF_PERCPU, "IPI", NULL); |
| BUG_ON(rc); |
| } |
| |
| int __init smp_xics_probe(void) |
| { |
| xics_request_ipi(); |
| |
| return cpus_weight(cpu_possible_map); |
| } |
| |
| #endif /* CONFIG_SMP */ |
| |
| |
| /* Initialization */ |
| |
| 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]; |
| } |
| } |
| |
| /* get the bit size of server numbers */ |
| isize = of_get_property(np, "ibm,interrupt-server#-size", NULL); |
| if (isize) |
| interrupt_server_size = *isize; |
| |
| of_node_put(np); |
| } |
| |
| static void __init xics_map_one_cpu(int hw_id, unsigned long addr, |
| unsigned long size) |
| { |
| 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; |
| } |
| } |
| } |
| |
| 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)++; |
| } |
| } |
| |
| 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)) { |
| of_node_put(np); |
| break; |
| } |
| xics_init_one_node(np, &indx); |
| } |
| if (found == 0) |
| return; |
| |
| xics_update_irq_servers(); |
| xics_init_host(); |
| |
| 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(); |
| |
| ppc64_boot_msg(0x21, "XICS Done"); |
| } |
| |
| /* Cpu startup, shutdown, and hotplug */ |
| |
| 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(); |
| } |
| |
| /* Have the calling processor join or leave the specified global queue */ |
| static void xics_set_cpu_giq(unsigned int gserver, unsigned int join) |
| { |
| int status = rtas_set_indicator_fast(GLOBAL_INTERRUPT_QUEUE, |
| (1UL << interrupt_server_size) - 1 - gserver, join); |
| WARN_ON(status < 0); |
| } |
| |
| void xics_setup_cpu(void) |
| { |
| xics_set_cpu_priority(0xff); |
| |
| xics_set_cpu_giq(default_distrib_server, 1); |
| } |
| |
| void xics_teardown_cpu(void) |
| { |
| int cpu = smp_processor_id(); |
| |
| xics_set_cpu_priority(0); |
| |
| /* Clear any pending IPI request */ |
| 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) |
| { |
| xics_teardown_cpu(); |
| |
| /* |
| * we take the ipi irq but and never return so we |
| * need to EOI the IPI, but want to leave our priority 0 |
| * |
| * should we check all the other interrupts too? |
| * should we be flagging idle loop instead? |
| * or creating some task to be scheduled? |
| */ |
| |
| if (firmware_has_feature(FW_FEATURE_LPAR)) |
| lpar_xirr_info_set((0x00 << 24) | XICS_IPI); |
| else |
| direct_xirr_info_set((0x00 << 24) | XICS_IPI); |
| |
| /* |
| * Some machines need to have at least one cpu in the GIQ, |
| * so leave the master cpu in the group. |
| */ |
| if (secondary) |
| xics_set_cpu_giq(default_distrib_server, 0); |
| } |
| |
| #ifdef CONFIG_HOTPLUG_CPU |
| |
| /* Interrupts are disabled. */ |
| void xics_migrate_irqs_away(void) |
| { |
| int cpu = smp_processor_id(), hw_cpu = hard_smp_processor_id(); |
| unsigned int irq, virq; |
| |
| /* If we used to be the default server, move to the new "boot_cpuid" */ |
| if (hw_cpu == default_server) |
| xics_update_irq_servers(); |
| |
| /* Reject any interrupt that was queued to us... */ |
| xics_set_cpu_priority(0); |
| |
| /* Remove ourselves from the global interrupt queue */ |
| xics_set_cpu_giq(default_distrib_server, 0); |
| |
| /* Allow IPIs again... */ |
| xics_set_cpu_priority(DEFAULT_PRIORITY); |
| |
| for_each_irq(virq) { |
| struct irq_desc *desc; |
| int xics_status[2]; |
| int status; |
| 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 "%s: ibm,get-xive irq=%u returns %d\n", |
| __func__, irq, 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 |