David Gibson | 007e8f5 | 2005-10-28 15:35:50 +1000 | [diff] [blame] | 1 | /* |
| 2 | * arch/powerpc/platforms/pseries/xics.c |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 3 | * |
| 4 | * Copyright 2000 IBM Corporation. |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or |
| 7 | * modify it under the terms of the GNU General Public License |
| 8 | * as published by the Free Software Foundation; either version |
| 9 | * 2 of the License, or (at your option) any later version. |
| 10 | */ |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 11 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 12 | #include <linux/types.h> |
| 13 | #include <linux/threads.h> |
| 14 | #include <linux/kernel.h> |
| 15 | #include <linux/irq.h> |
| 16 | #include <linux/smp.h> |
| 17 | #include <linux/interrupt.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | #include <linux/init.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | #include <linux/radix-tree.h> |
| 20 | #include <linux/cpu.h> |
Andre Detsch | 8435b02 | 2009-11-04 13:03:19 -0200 | [diff] [blame] | 21 | #include <linux/msi.h> |
Milton Miller | 188bddd | 2008-10-10 01:56:33 +0000 | [diff] [blame] | 22 | #include <linux/of.h> |
Mark Nelson | 49bd364 | 2009-12-07 20:32:17 +0000 | [diff] [blame] | 23 | #include <linux/percpu.h> |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 24 | |
Michael Ellerman | 57cfb81 | 2006-03-21 20:45:59 +1100 | [diff] [blame] | 25 | #include <asm/firmware.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | #include <asm/io.h> |
| 27 | #include <asm/pgtable.h> |
| 28 | #include <asm/smp.h> |
| 29 | #include <asm/rtas.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | #include <asm/hvcall.h> |
| 31 | #include <asm/machdep.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | |
David Gibson | 007e8f5 | 2005-10-28 15:35:50 +1000 | [diff] [blame] | 33 | #include "xics.h" |
Anton Blanchard | b9377ff | 2006-07-19 08:01:28 +1000 | [diff] [blame] | 34 | #include "plpar_wrappers.h" |
David Gibson | 007e8f5 | 2005-10-28 15:35:50 +1000 | [diff] [blame] | 35 | |
Milton Miller | 0641cc9 | 2008-10-10 01:56:30 +0000 | [diff] [blame] | 36 | static struct irq_host *xics_host; |
| 37 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | #define XICS_IPI 2 |
| 39 | #define XICS_IRQ_SPURIOUS 0 |
| 40 | |
| 41 | /* Want a priority other than 0. Various HW issues require this. */ |
| 42 | #define DEFAULT_PRIORITY 5 |
| 43 | |
David Gibson | 007e8f5 | 2005-10-28 15:35:50 +1000 | [diff] [blame] | 44 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | * Mark IPIs as higher priority so we can take them inside interrupts that |
Thomas Gleixner | 6714465 | 2006-07-01 19:29:22 -0700 | [diff] [blame] | 46 | * arent marked IRQF_DISABLED |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | */ |
| 48 | #define IPI_PRIORITY 4 |
| 49 | |
Mark Nelson | 49bd364 | 2009-12-07 20:32:17 +0000 | [diff] [blame] | 50 | /* The least favored priority */ |
| 51 | #define LOWEST_PRIORITY 0xFF |
| 52 | |
| 53 | /* The number of priorities defined above */ |
| 54 | #define MAX_NUM_PRIORITIES 3 |
| 55 | |
Milton Miller | 0641cc9 | 2008-10-10 01:56:30 +0000 | [diff] [blame] | 56 | static unsigned int default_server = 0xFF; |
| 57 | static unsigned int default_distrib_server = 0; |
| 58 | static unsigned int interrupt_server_size = 8; |
| 59 | |
| 60 | /* RTAS service tokens */ |
| 61 | static int ibm_get_xive; |
| 62 | static int ibm_set_xive; |
| 63 | static int ibm_int_on; |
| 64 | static int ibm_int_off; |
| 65 | |
Mark Nelson | 49bd364 | 2009-12-07 20:32:17 +0000 | [diff] [blame] | 66 | struct xics_cppr { |
| 67 | unsigned char stack[MAX_NUM_PRIORITIES]; |
| 68 | int index; |
| 69 | }; |
| 70 | |
| 71 | static DEFINE_PER_CPU(struct xics_cppr, xics_cppr); |
Milton Miller | 0641cc9 | 2008-10-10 01:56:30 +0000 | [diff] [blame] | 72 | |
| 73 | /* Direct hardware low level accessors */ |
| 74 | |
| 75 | /* The part of the interrupt presentation layer that we care about */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | struct xics_ipl { |
| 77 | union { |
| 78 | u32 word; |
| 79 | u8 bytes[4]; |
| 80 | } xirr_poll; |
| 81 | union { |
| 82 | u32 word; |
| 83 | u8 bytes[4]; |
| 84 | } xirr; |
| 85 | u32 dummy; |
| 86 | union { |
| 87 | u32 word; |
| 88 | u8 bytes[4]; |
| 89 | } qirr; |
| 90 | }; |
| 91 | |
| 92 | static struct xics_ipl __iomem *xics_per_cpu[NR_CPUS]; |
| 93 | |
Milton Miller | d7cf0ed | 2007-12-14 15:52:09 +1100 | [diff] [blame] | 94 | static inline unsigned int direct_xirr_info_get(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | { |
Milton Miller | d7cf0ed | 2007-12-14 15:52:09 +1100 | [diff] [blame] | 96 | int cpu = smp_processor_id(); |
| 97 | |
| 98 | return in_be32(&xics_per_cpu[cpu]->xirr.word); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | } |
| 100 | |
Milton Miller | 9dc2d44 | 2008-10-10 01:56:32 +0000 | [diff] [blame] | 101 | static inline void direct_xirr_info_set(unsigned int value) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | { |
Milton Miller | d7cf0ed | 2007-12-14 15:52:09 +1100 | [diff] [blame] | 103 | int cpu = smp_processor_id(); |
| 104 | |
| 105 | out_be32(&xics_per_cpu[cpu]->xirr.word, value); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | } |
| 107 | |
Milton Miller | d7cf0ed | 2007-12-14 15:52:09 +1100 | [diff] [blame] | 108 | static inline void direct_cppr_info(u8 value) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | { |
Milton Miller | d7cf0ed | 2007-12-14 15:52:09 +1100 | [diff] [blame] | 110 | int cpu = smp_processor_id(); |
| 111 | |
| 112 | out_8(&xics_per_cpu[cpu]->xirr.bytes[0], value); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 113 | } |
| 114 | |
Benjamin Herrenschmidt | b9e5b4e | 2006-07-03 19:32:51 +1000 | [diff] [blame] | 115 | static inline void direct_qirr_info(int n_cpu, u8 value) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | { |
| 117 | out_8(&xics_per_cpu[n_cpu]->qirr.bytes[0], value); |
| 118 | } |
| 119 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | |
Benjamin Herrenschmidt | b9e5b4e | 2006-07-03 19:32:51 +1000 | [diff] [blame] | 121 | /* LPAR low level accessors */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 122 | |
Mark Nelson | f09b7b2 | 2010-01-31 20:12:58 +0000 | [diff] [blame] | 123 | static inline unsigned int lpar_xirr_info_get(unsigned char cppr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | { |
| 125 | unsigned long lpar_rc; |
David Gibson | 007e8f5 | 2005-10-28 15:35:50 +1000 | [diff] [blame] | 126 | unsigned long return_value; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | |
Mark Nelson | f09b7b2 | 2010-01-31 20:12:58 +0000 | [diff] [blame] | 128 | lpar_rc = plpar_xirr(&return_value, cppr); |
Segher Boessenkool | 706c8c9 | 2006-03-30 14:49:40 +0200 | [diff] [blame] | 129 | if (lpar_rc != H_SUCCESS) |
Frans Pop | 8354be9 | 2010-02-06 07:47:20 +0000 | [diff] [blame] | 130 | panic(" bad return code xirr - rc = %lx\n", lpar_rc); |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 131 | return (unsigned int)return_value; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 132 | } |
| 133 | |
Milton Miller | 9dc2d44 | 2008-10-10 01:56:32 +0000 | [diff] [blame] | 134 | static inline void lpar_xirr_info_set(unsigned int value) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 135 | { |
| 136 | unsigned long lpar_rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 137 | |
Milton Miller | 9dc2d44 | 2008-10-10 01:56:32 +0000 | [diff] [blame] | 138 | lpar_rc = plpar_eoi(value); |
Segher Boessenkool | 706c8c9 | 2006-03-30 14:49:40 +0200 | [diff] [blame] | 139 | if (lpar_rc != H_SUCCESS) |
Milton Miller | 9dc2d44 | 2008-10-10 01:56:32 +0000 | [diff] [blame] | 140 | panic("bad return code EOI - rc = %ld, value=%x\n", lpar_rc, |
| 141 | value); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | } |
| 143 | |
Milton Miller | d7cf0ed | 2007-12-14 15:52:09 +1100 | [diff] [blame] | 144 | static inline void lpar_cppr_info(u8 value) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 145 | { |
| 146 | unsigned long lpar_rc; |
| 147 | |
| 148 | lpar_rc = plpar_cppr(value); |
Segher Boessenkool | 706c8c9 | 2006-03-30 14:49:40 +0200 | [diff] [blame] | 149 | if (lpar_rc != H_SUCCESS) |
David Gibson | 007e8f5 | 2005-10-28 15:35:50 +1000 | [diff] [blame] | 150 | panic("bad return code cppr - rc = %lx\n", lpar_rc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 151 | } |
| 152 | |
Benjamin Herrenschmidt | b9e5b4e | 2006-07-03 19:32:51 +1000 | [diff] [blame] | 153 | static inline void lpar_qirr_info(int n_cpu , u8 value) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | { |
| 155 | unsigned long lpar_rc; |
| 156 | |
| 157 | lpar_rc = plpar_ipi(get_hard_smp_processor_id(n_cpu), value); |
Segher Boessenkool | 706c8c9 | 2006-03-30 14:49:40 +0200 | [diff] [blame] | 158 | if (lpar_rc != H_SUCCESS) |
David Gibson | 007e8f5 | 2005-10-28 15:35:50 +1000 | [diff] [blame] | 159 | panic("bad return code qirr - rc = %lx\n", lpar_rc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | } |
| 161 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | |
Milton Miller | 0641cc9 | 2008-10-10 01:56:30 +0000 | [diff] [blame] | 163 | /* Interface to generic irq subsystem */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 164 | |
| 165 | #ifdef CONFIG_SMP |
Anton Blanchard | 92cb369 | 2010-01-04 15:26:33 +0000 | [diff] [blame] | 166 | static int get_irq_server(unsigned int virq, cpumask_t cpumask, |
| 167 | unsigned int strict_check) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | { |
Mohan Kumar M | 7ccb4a6 | 2007-06-13 00:51:57 +1000 | [diff] [blame] | 169 | int server; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | /* For the moment only implement delivery to all cpus or one cpu */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 171 | cpumask_t tmp = CPU_MASK_NONE; |
| 172 | |
| 173 | if (!distribute_irqs) |
| 174 | return default_server; |
| 175 | |
Mohan Kumar M | 7ccb4a6 | 2007-06-13 00:51:57 +1000 | [diff] [blame] | 176 | if (!cpus_equal(cpumask, CPU_MASK_ALL)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 177 | cpus_and(tmp, cpu_online_map, cpumask); |
| 178 | |
Mohan Kumar M | 7ccb4a6 | 2007-06-13 00:51:57 +1000 | [diff] [blame] | 179 | server = first_cpu(tmp); |
| 180 | |
| 181 | if (server < NR_CPUS) |
| 182 | return get_hard_smp_processor_id(server); |
| 183 | |
| 184 | if (strict_check) |
| 185 | return -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 186 | } |
| 187 | |
Mohan Kumar M | 7ccb4a6 | 2007-06-13 00:51:57 +1000 | [diff] [blame] | 188 | if (cpus_equal(cpu_online_map, cpu_present_map)) |
| 189 | return default_distrib_server; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | |
Mohan Kumar M | 7ccb4a6 | 2007-06-13 00:51:57 +1000 | [diff] [blame] | 191 | return default_server; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | } |
| 193 | #else |
Benjamin Herrenschmidt | bf647fa | 2010-02-01 13:32:41 +1100 | [diff] [blame] | 194 | #define get_irq_server(virq, cpumask, strict_check) (default_server) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 195 | #endif |
| 196 | |
Benjamin Herrenschmidt | b9e5b4e | 2006-07-03 19:32:51 +1000 | [diff] [blame] | 197 | static void xics_unmask_irq(unsigned int virq) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 198 | { |
| 199 | unsigned int irq; |
| 200 | int call_status; |
Mohan Kumar M | 7ccb4a6 | 2007-06-13 00:51:57 +1000 | [diff] [blame] | 201 | int server; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | |
Michael Ellerman | b69e9e9 | 2009-06-17 18:13:53 +0000 | [diff] [blame] | 203 | pr_devel("xics: unmask virq %d\n", virq); |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 204 | |
| 205 | irq = (unsigned int)irq_map[virq].hwirq; |
Michael Ellerman | b69e9e9 | 2009-06-17 18:13:53 +0000 | [diff] [blame] | 206 | pr_devel(" -> map to hwirq 0x%x\n", irq); |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 207 | if (irq == XICS_IPI || irq == XICS_IRQ_SPURIOUS) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 208 | return; |
| 209 | |
Anton Blanchard | 92cb369 | 2010-01-04 15:26:33 +0000 | [diff] [blame] | 210 | server = get_irq_server(virq, *(irq_to_desc(virq)->affinity), 0); |
Benjamin Herrenschmidt | b9e5b4e | 2006-07-03 19:32:51 +1000 | [diff] [blame] | 211 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | call_status = rtas_call(ibm_set_xive, 3, 1, NULL, irq, server, |
| 213 | DEFAULT_PRIORITY); |
| 214 | if (call_status != 0) { |
Milton Miller | 2172fe8 | 2008-10-10 01:56:39 +0000 | [diff] [blame] | 215 | printk(KERN_ERR |
| 216 | "%s: ibm_set_xive irq %u server %x returned %d\n", |
| 217 | __func__, irq, server, call_status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 218 | return; |
| 219 | } |
| 220 | |
| 221 | /* Now unmask the interrupt (often a no-op) */ |
| 222 | call_status = rtas_call(ibm_int_on, 1, 1, NULL, irq); |
| 223 | if (call_status != 0) { |
Milton Miller | 2172fe8 | 2008-10-10 01:56:39 +0000 | [diff] [blame] | 224 | printk(KERN_ERR "%s: ibm_int_on irq=%u returned %d\n", |
| 225 | __func__, irq, call_status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | return; |
| 227 | } |
| 228 | } |
| 229 | |
Milton Miller | 0641cc9 | 2008-10-10 01:56:30 +0000 | [diff] [blame] | 230 | static unsigned int xics_startup(unsigned int virq) |
| 231 | { |
Andre Detsch | 8435b02 | 2009-11-04 13:03:19 -0200 | [diff] [blame] | 232 | /* |
| 233 | * The generic MSI code returns with the interrupt disabled on the |
| 234 | * card, using the MSI mask bits. Firmware doesn't appear to unmask |
| 235 | * at that level, so we do it here by hand. |
| 236 | */ |
| 237 | if (irq_to_desc(virq)->msi_desc) |
| 238 | unmask_msi_irq(virq); |
| 239 | |
Milton Miller | 0641cc9 | 2008-10-10 01:56:30 +0000 | [diff] [blame] | 240 | /* unmask it */ |
| 241 | xics_unmask_irq(virq); |
| 242 | return 0; |
| 243 | } |
| 244 | |
Benjamin Herrenschmidt | b9e5b4e | 2006-07-03 19:32:51 +1000 | [diff] [blame] | 245 | static void xics_mask_real_irq(unsigned int irq) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 246 | { |
| 247 | int call_status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 248 | |
| 249 | if (irq == XICS_IPI) |
| 250 | return; |
| 251 | |
| 252 | call_status = rtas_call(ibm_int_off, 1, 1, NULL, irq); |
| 253 | if (call_status != 0) { |
Milton Miller | 2172fe8 | 2008-10-10 01:56:39 +0000 | [diff] [blame] | 254 | printk(KERN_ERR "%s: ibm_int_off irq=%u returned %d\n", |
| 255 | __func__, irq, call_status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 256 | return; |
| 257 | } |
| 258 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 259 | /* Have to set XIVE to 0xff to be able to remove a slot */ |
Michal Ostrowski | 673aeb7 | 2006-12-20 07:29:40 -0600 | [diff] [blame] | 260 | call_status = rtas_call(ibm_set_xive, 3, 1, NULL, irq, |
| 261 | default_server, 0xff); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 262 | if (call_status != 0) { |
Milton Miller | 2172fe8 | 2008-10-10 01:56:39 +0000 | [diff] [blame] | 263 | printk(KERN_ERR "%s: ibm_set_xive(0xff) irq=%u returned %d\n", |
| 264 | __func__, irq, call_status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | return; |
| 266 | } |
| 267 | } |
| 268 | |
Benjamin Herrenschmidt | b9e5b4e | 2006-07-03 19:32:51 +1000 | [diff] [blame] | 269 | static void xics_mask_irq(unsigned int virq) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 270 | { |
| 271 | unsigned int irq; |
| 272 | |
Michael Ellerman | b69e9e9 | 2009-06-17 18:13:53 +0000 | [diff] [blame] | 273 | pr_devel("xics: mask virq %d\n", virq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 274 | |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 275 | irq = (unsigned int)irq_map[virq].hwirq; |
| 276 | if (irq == XICS_IPI || irq == XICS_IRQ_SPURIOUS) |
| 277 | return; |
| 278 | xics_mask_real_irq(irq); |
Benjamin Herrenschmidt | b9e5b4e | 2006-07-03 19:32:51 +1000 | [diff] [blame] | 279 | } |
| 280 | |
Milton Miller | 0641cc9 | 2008-10-10 01:56:30 +0000 | [diff] [blame] | 281 | static void xics_mask_unknown_vec(unsigned int vec) |
Benjamin Herrenschmidt | b9e5b4e | 2006-07-03 19:32:51 +1000 | [diff] [blame] | 282 | { |
Milton Miller | 0641cc9 | 2008-10-10 01:56:30 +0000 | [diff] [blame] | 283 | printk(KERN_ERR "Interrupt %u (real) is invalid, disabling it.\n", vec); |
| 284 | xics_mask_real_irq(vec); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 285 | } |
| 286 | |
Milton Miller | 8767e9b | 2008-10-10 01:56:23 +0000 | [diff] [blame] | 287 | static inline unsigned int xics_xirr_vector(unsigned int xirr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 288 | { |
Milton Miller | 8767e9b | 2008-10-10 01:56:23 +0000 | [diff] [blame] | 289 | /* |
| 290 | * The top byte is the old cppr, to be restored on EOI. |
| 291 | * The remaining 24 bits are the vector. |
| 292 | */ |
| 293 | return xirr & 0x00ffffff; |
| 294 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 295 | |
Mark Nelson | 49bd364 | 2009-12-07 20:32:17 +0000 | [diff] [blame] | 296 | static void push_cppr(unsigned int vec) |
| 297 | { |
| 298 | struct xics_cppr *os_cppr = &__get_cpu_var(xics_cppr); |
| 299 | |
| 300 | if (WARN_ON(os_cppr->index >= MAX_NUM_PRIORITIES - 1)) |
| 301 | return; |
| 302 | |
| 303 | if (vec == XICS_IPI) |
| 304 | os_cppr->stack[++os_cppr->index] = IPI_PRIORITY; |
| 305 | else |
| 306 | os_cppr->stack[++os_cppr->index] = DEFAULT_PRIORITY; |
| 307 | } |
| 308 | |
Olaf Hering | 35a84c2 | 2006-10-07 22:08:26 +1000 | [diff] [blame] | 309 | static unsigned int xics_get_irq_direct(void) |
Benjamin Herrenschmidt | b9e5b4e | 2006-07-03 19:32:51 +1000 | [diff] [blame] | 310 | { |
Milton Miller | 8767e9b | 2008-10-10 01:56:23 +0000 | [diff] [blame] | 311 | unsigned int xirr = direct_xirr_info_get(); |
| 312 | unsigned int vec = xics_xirr_vector(xirr); |
| 313 | unsigned int irq; |
| 314 | |
| 315 | if (vec == XICS_IRQ_SPURIOUS) |
| 316 | return NO_IRQ; |
| 317 | |
| 318 | irq = irq_radix_revmap_lookup(xics_host, vec); |
Mark Nelson | 49bd364 | 2009-12-07 20:32:17 +0000 | [diff] [blame] | 319 | if (likely(irq != NO_IRQ)) { |
| 320 | push_cppr(vec); |
Milton Miller | 8767e9b | 2008-10-10 01:56:23 +0000 | [diff] [blame] | 321 | return irq; |
Mark Nelson | 49bd364 | 2009-12-07 20:32:17 +0000 | [diff] [blame] | 322 | } |
Milton Miller | 8767e9b | 2008-10-10 01:56:23 +0000 | [diff] [blame] | 323 | |
| 324 | /* We don't have a linux mapping, so have rtas mask it. */ |
| 325 | xics_mask_unknown_vec(vec); |
| 326 | |
| 327 | /* We might learn about it later, so EOI it */ |
| 328 | direct_xirr_info_set(xirr); |
| 329 | return NO_IRQ; |
Benjamin Herrenschmidt | b9e5b4e | 2006-07-03 19:32:51 +1000 | [diff] [blame] | 330 | } |
| 331 | |
Olaf Hering | 35a84c2 | 2006-10-07 22:08:26 +1000 | [diff] [blame] | 332 | static unsigned int xics_get_irq_lpar(void) |
Benjamin Herrenschmidt | b9e5b4e | 2006-07-03 19:32:51 +1000 | [diff] [blame] | 333 | { |
Mark Nelson | f09b7b2 | 2010-01-31 20:12:58 +0000 | [diff] [blame] | 334 | struct xics_cppr *os_cppr = &__get_cpu_var(xics_cppr); |
| 335 | unsigned int xirr = lpar_xirr_info_get(os_cppr->stack[os_cppr->index]); |
Milton Miller | 8767e9b | 2008-10-10 01:56:23 +0000 | [diff] [blame] | 336 | unsigned int vec = xics_xirr_vector(xirr); |
| 337 | unsigned int irq; |
| 338 | |
| 339 | if (vec == XICS_IRQ_SPURIOUS) |
| 340 | return NO_IRQ; |
| 341 | |
| 342 | irq = irq_radix_revmap_lookup(xics_host, vec); |
Mark Nelson | 49bd364 | 2009-12-07 20:32:17 +0000 | [diff] [blame] | 343 | if (likely(irq != NO_IRQ)) { |
| 344 | push_cppr(vec); |
Milton Miller | 8767e9b | 2008-10-10 01:56:23 +0000 | [diff] [blame] | 345 | return irq; |
Mark Nelson | 49bd364 | 2009-12-07 20:32:17 +0000 | [diff] [blame] | 346 | } |
Milton Miller | 8767e9b | 2008-10-10 01:56:23 +0000 | [diff] [blame] | 347 | |
| 348 | /* We don't have a linux mapping, so have RTAS mask it. */ |
| 349 | xics_mask_unknown_vec(vec); |
| 350 | |
| 351 | /* We might learn about it later, so EOI it */ |
| 352 | lpar_xirr_info_set(xirr); |
| 353 | return NO_IRQ; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | } |
| 355 | |
Mark Nelson | 49bd364 | 2009-12-07 20:32:17 +0000 | [diff] [blame] | 356 | static unsigned char pop_cppr(void) |
| 357 | { |
| 358 | struct xics_cppr *os_cppr = &__get_cpu_var(xics_cppr); |
| 359 | |
| 360 | if (WARN_ON(os_cppr->index < 1)) |
| 361 | return LOWEST_PRIORITY; |
| 362 | |
| 363 | return os_cppr->stack[--os_cppr->index]; |
| 364 | } |
| 365 | |
Milton Miller | 0641cc9 | 2008-10-10 01:56:30 +0000 | [diff] [blame] | 366 | static void xics_eoi_direct(unsigned int virq) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | { |
Milton Miller | 0641cc9 | 2008-10-10 01:56:30 +0000 | [diff] [blame] | 368 | unsigned int irq = (unsigned int)irq_map[virq].hwirq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 369 | |
Benjamin Herrenschmidt | b9e5b4e | 2006-07-03 19:32:51 +1000 | [diff] [blame] | 370 | iosync(); |
Mark Nelson | 49bd364 | 2009-12-07 20:32:17 +0000 | [diff] [blame] | 371 | direct_xirr_info_set((pop_cppr() << 24) | irq); |
Milton Miller | 0641cc9 | 2008-10-10 01:56:30 +0000 | [diff] [blame] | 372 | } |
| 373 | |
| 374 | static void xics_eoi_lpar(unsigned int virq) |
| 375 | { |
| 376 | unsigned int irq = (unsigned int)irq_map[virq].hwirq; |
| 377 | |
| 378 | iosync(); |
Mark Nelson | 49bd364 | 2009-12-07 20:32:17 +0000 | [diff] [blame] | 379 | lpar_xirr_info_set((pop_cppr() << 24) | irq); |
Benjamin Herrenschmidt | b9e5b4e | 2006-07-03 19:32:51 +1000 | [diff] [blame] | 380 | } |
| 381 | |
Yinghai Lu | d5dedd4 | 2009-04-27 17:59:21 -0700 | [diff] [blame] | 382 | static int xics_set_affinity(unsigned int virq, const struct cpumask *cpumask) |
Benjamin Herrenschmidt | b9e5b4e | 2006-07-03 19:32:51 +1000 | [diff] [blame] | 383 | { |
| 384 | unsigned int irq; |
| 385 | int status; |
| 386 | int xics_status[2]; |
Mohan Kumar M | 7ccb4a6 | 2007-06-13 00:51:57 +1000 | [diff] [blame] | 387 | int irq_server; |
Benjamin Herrenschmidt | b9e5b4e | 2006-07-03 19:32:51 +1000 | [diff] [blame] | 388 | |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 389 | irq = (unsigned int)irq_map[virq].hwirq; |
| 390 | if (irq == XICS_IPI || irq == XICS_IRQ_SPURIOUS) |
Yinghai Lu | d5dedd4 | 2009-04-27 17:59:21 -0700 | [diff] [blame] | 391 | return -1; |
Benjamin Herrenschmidt | b9e5b4e | 2006-07-03 19:32:51 +1000 | [diff] [blame] | 392 | |
| 393 | status = rtas_call(ibm_get_xive, 1, 3, xics_status, irq); |
| 394 | |
| 395 | if (status) { |
Milton Miller | 2172fe8 | 2008-10-10 01:56:39 +0000 | [diff] [blame] | 396 | printk(KERN_ERR "%s: ibm,get-xive irq=%u returns %d\n", |
| 397 | __func__, irq, status); |
Yinghai Lu | d5dedd4 | 2009-04-27 17:59:21 -0700 | [diff] [blame] | 398 | return -1; |
Benjamin Herrenschmidt | b9e5b4e | 2006-07-03 19:32:51 +1000 | [diff] [blame] | 399 | } |
| 400 | |
Mohan Kumar M | 7ccb4a6 | 2007-06-13 00:51:57 +1000 | [diff] [blame] | 401 | /* |
| 402 | * For the moment only implement delivery to all cpus or one cpu. |
| 403 | * Get current irq_server for the given irq |
| 404 | */ |
Anton Blanchard | 92cb369 | 2010-01-04 15:26:33 +0000 | [diff] [blame] | 405 | irq_server = get_irq_server(virq, *cpumask, 1); |
Mohan Kumar M | 7ccb4a6 | 2007-06-13 00:51:57 +1000 | [diff] [blame] | 406 | if (irq_server == -1) { |
| 407 | char cpulist[128]; |
| 408 | cpumask_scnprintf(cpulist, sizeof(cpulist), cpumask); |
Milton Miller | 2172fe8 | 2008-10-10 01:56:39 +0000 | [diff] [blame] | 409 | printk(KERN_WARNING |
| 410 | "%s: No online cpus in the mask %s for irq %d\n", |
| 411 | __func__, cpulist, virq); |
Yinghai Lu | d5dedd4 | 2009-04-27 17:59:21 -0700 | [diff] [blame] | 412 | return -1; |
Benjamin Herrenschmidt | b9e5b4e | 2006-07-03 19:32:51 +1000 | [diff] [blame] | 413 | } |
| 414 | |
| 415 | status = rtas_call(ibm_set_xive, 3, 1, NULL, |
Mohan Kumar M | 7ccb4a6 | 2007-06-13 00:51:57 +1000 | [diff] [blame] | 416 | irq, irq_server, xics_status[1]); |
Benjamin Herrenschmidt | b9e5b4e | 2006-07-03 19:32:51 +1000 | [diff] [blame] | 417 | |
| 418 | if (status) { |
Milton Miller | 2172fe8 | 2008-10-10 01:56:39 +0000 | [diff] [blame] | 419 | printk(KERN_ERR "%s: ibm,set-xive irq=%u returns %d\n", |
| 420 | __func__, irq, status); |
Yinghai Lu | d5dedd4 | 2009-04-27 17:59:21 -0700 | [diff] [blame] | 421 | return -1; |
Benjamin Herrenschmidt | b9e5b4e | 2006-07-03 19:32:51 +1000 | [diff] [blame] | 422 | } |
Yinghai Lu | d5dedd4 | 2009-04-27 17:59:21 -0700 | [diff] [blame] | 423 | |
| 424 | return 0; |
Benjamin Herrenschmidt | b9e5b4e | 2006-07-03 19:32:51 +1000 | [diff] [blame] | 425 | } |
| 426 | |
| 427 | static struct irq_chip xics_pic_direct = { |
Anton Blanchard | fc380c0 | 2010-01-31 20:33:41 +0000 | [diff] [blame] | 428 | .name = "XICS", |
Benjamin Herrenschmidt | b9e5b4e | 2006-07-03 19:32:51 +1000 | [diff] [blame] | 429 | .startup = xics_startup, |
| 430 | .mask = xics_mask_irq, |
| 431 | .unmask = xics_unmask_irq, |
| 432 | .eoi = xics_eoi_direct, |
| 433 | .set_affinity = xics_set_affinity |
| 434 | }; |
| 435 | |
Benjamin Herrenschmidt | b9e5b4e | 2006-07-03 19:32:51 +1000 | [diff] [blame] | 436 | static struct irq_chip xics_pic_lpar = { |
Anton Blanchard | fc380c0 | 2010-01-31 20:33:41 +0000 | [diff] [blame] | 437 | .name = "XICS", |
Benjamin Herrenschmidt | b9e5b4e | 2006-07-03 19:32:51 +1000 | [diff] [blame] | 438 | .startup = xics_startup, |
| 439 | .mask = xics_mask_irq, |
| 440 | .unmask = xics_unmask_irq, |
| 441 | .eoi = xics_eoi_lpar, |
| 442 | .set_affinity = xics_set_affinity |
| 443 | }; |
| 444 | |
Milton Miller | 0641cc9 | 2008-10-10 01:56:30 +0000 | [diff] [blame] | 445 | |
| 446 | /* Interface to arch irq controller subsystem layer */ |
| 447 | |
Michael Ellerman | 1af9fa8 | 2008-04-01 17:42:27 +1100 | [diff] [blame] | 448 | /* Points to the irq_chip we're actually using */ |
| 449 | static struct irq_chip *xics_irq_chip; |
Benjamin Herrenschmidt | b9e5b4e | 2006-07-03 19:32:51 +1000 | [diff] [blame] | 450 | |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 451 | static int xics_host_match(struct irq_host *h, struct device_node *node) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 452 | { |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 453 | /* IBM machines have interrupt parents of various funky types for things |
| 454 | * like vdevices, events, etc... The trick we use here is to match |
| 455 | * everything here except the legacy 8259 which is compatible "chrp,iic" |
Paul Mackerras | 6c80a21 | 2005-05-06 16:28:56 +1000 | [diff] [blame] | 456 | */ |
Stephen Rothwell | 55b61fe | 2007-05-03 17:26:52 +1000 | [diff] [blame] | 457 | return !of_device_is_compatible(node, "chrp,iic"); |
Paul Mackerras | 6c80a21 | 2005-05-06 16:28:56 +1000 | [diff] [blame] | 458 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 459 | |
Michael Ellerman | 1af9fa8 | 2008-04-01 17:42:27 +1100 | [diff] [blame] | 460 | static int xics_host_map(struct irq_host *h, unsigned int virq, |
| 461 | irq_hw_number_t hw) |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 462 | { |
Michael Ellerman | b69e9e9 | 2009-06-17 18:13:53 +0000 | [diff] [blame] | 463 | pr_devel("xics: map virq %d, hwirq 0x%lx\n", virq, hw); |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 464 | |
Sebastien Dugue | 967e012 | 2008-09-04 22:37:07 +1000 | [diff] [blame] | 465 | /* Insert the interrupt mapping into the radix tree for fast lookup */ |
| 466 | irq_radix_revmap_insert(xics_host, virq, hw); |
| 467 | |
Michael Ellerman | 6cff46f | 2009-10-13 19:44:51 +0000 | [diff] [blame] | 468 | irq_to_desc(virq)->status |= IRQ_LEVEL; |
Michael Ellerman | 1af9fa8 | 2008-04-01 17:42:27 +1100 | [diff] [blame] | 469 | set_irq_chip_and_handler(virq, xics_irq_chip, handle_fasteoi_irq); |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 470 | return 0; |
| 471 | } |
| 472 | |
| 473 | static int xics_host_xlate(struct irq_host *h, struct device_node *ct, |
Roman Fietze | 40d50cf | 2009-12-08 02:39:50 +0000 | [diff] [blame] | 474 | const u32 *intspec, unsigned int intsize, |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 475 | irq_hw_number_t *out_hwirq, unsigned int *out_flags) |
| 476 | |
| 477 | { |
| 478 | /* Current xics implementation translates everything |
| 479 | * to level. It is not technically right for MSIs but this |
| 480 | * is irrelevant at this point. We might get smarter in the future |
| 481 | */ |
| 482 | *out_hwirq = intspec[0]; |
| 483 | *out_flags = IRQ_TYPE_LEVEL_LOW; |
| 484 | |
| 485 | return 0; |
| 486 | } |
| 487 | |
Michael Ellerman | 1af9fa8 | 2008-04-01 17:42:27 +1100 | [diff] [blame] | 488 | static struct irq_host_ops xics_host_ops = { |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 489 | .match = xics_host_match, |
Michael Ellerman | 1af9fa8 | 2008-04-01 17:42:27 +1100 | [diff] [blame] | 490 | .map = xics_host_map, |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 491 | .xlate = xics_host_xlate, |
| 492 | }; |
| 493 | |
| 494 | static void __init xics_init_host(void) |
| 495 | { |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 496 | if (firmware_has_feature(FW_FEATURE_LPAR)) |
Michael Ellerman | 1af9fa8 | 2008-04-01 17:42:27 +1100 | [diff] [blame] | 497 | xics_irq_chip = &xics_pic_lpar; |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 498 | else |
Michael Ellerman | 1af9fa8 | 2008-04-01 17:42:27 +1100 | [diff] [blame] | 499 | xics_irq_chip = &xics_pic_direct; |
| 500 | |
| 501 | xics_host = irq_alloc_host(NULL, IRQ_HOST_MAP_TREE, 0, &xics_host_ops, |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 502 | XICS_IRQ_SPURIOUS); |
| 503 | BUG_ON(xics_host == NULL); |
| 504 | irq_set_default_host(xics_host); |
| 505 | } |
| 506 | |
Milton Miller | 0641cc9 | 2008-10-10 01:56:30 +0000 | [diff] [blame] | 507 | |
| 508 | /* Inter-processor interrupt support */ |
| 509 | |
| 510 | #ifdef CONFIG_SMP |
| 511 | /* |
| 512 | * XICS only has a single IPI, so encode the messages per CPU |
| 513 | */ |
Anton Blanchard | fda9d86 | 2010-01-31 20:32:51 +0000 | [diff] [blame] | 514 | static DEFINE_PER_CPU_SHARED_ALIGNED(unsigned long, xics_ipi_message); |
Milton Miller | 0641cc9 | 2008-10-10 01:56:30 +0000 | [diff] [blame] | 515 | |
| 516 | static inline void smp_xics_do_message(int cpu, int msg) |
| 517 | { |
Anton Blanchard | fda9d86 | 2010-01-31 20:32:51 +0000 | [diff] [blame] | 518 | unsigned long *tgt = &per_cpu(xics_ipi_message, cpu); |
| 519 | |
| 520 | set_bit(msg, tgt); |
Milton Miller | 0641cc9 | 2008-10-10 01:56:30 +0000 | [diff] [blame] | 521 | mb(); |
| 522 | if (firmware_has_feature(FW_FEATURE_LPAR)) |
| 523 | lpar_qirr_info(cpu, IPI_PRIORITY); |
| 524 | else |
| 525 | direct_qirr_info(cpu, IPI_PRIORITY); |
| 526 | } |
| 527 | |
| 528 | void smp_xics_message_pass(int target, int msg) |
| 529 | { |
| 530 | unsigned int i; |
| 531 | |
| 532 | if (target < NR_CPUS) { |
| 533 | smp_xics_do_message(target, msg); |
| 534 | } else { |
| 535 | for_each_online_cpu(i) { |
| 536 | if (target == MSG_ALL_BUT_SELF |
| 537 | && i == smp_processor_id()) |
| 538 | continue; |
| 539 | smp_xics_do_message(i, msg); |
| 540 | } |
| 541 | } |
| 542 | } |
| 543 | |
| 544 | static irqreturn_t xics_ipi_dispatch(int cpu) |
| 545 | { |
Anton Blanchard | fda9d86 | 2010-01-31 20:32:51 +0000 | [diff] [blame] | 546 | unsigned long *tgt = &per_cpu(xics_ipi_message, cpu); |
| 547 | |
Milton Miller | 0641cc9 | 2008-10-10 01:56:30 +0000 | [diff] [blame] | 548 | WARN_ON(cpu_is_offline(cpu)); |
| 549 | |
Milton Miller | 199f45c | 2008-10-10 01:56:44 +0000 | [diff] [blame] | 550 | mb(); /* order mmio clearing qirr */ |
Anton Blanchard | fda9d86 | 2010-01-31 20:32:51 +0000 | [diff] [blame] | 551 | while (*tgt) { |
| 552 | if (test_and_clear_bit(PPC_MSG_CALL_FUNCTION, tgt)) { |
Milton Miller | 0641cc9 | 2008-10-10 01:56:30 +0000 | [diff] [blame] | 553 | smp_message_recv(PPC_MSG_CALL_FUNCTION); |
| 554 | } |
Anton Blanchard | fda9d86 | 2010-01-31 20:32:51 +0000 | [diff] [blame] | 555 | if (test_and_clear_bit(PPC_MSG_RESCHEDULE, tgt)) { |
Milton Miller | 0641cc9 | 2008-10-10 01:56:30 +0000 | [diff] [blame] | 556 | smp_message_recv(PPC_MSG_RESCHEDULE); |
| 557 | } |
Anton Blanchard | fda9d86 | 2010-01-31 20:32:51 +0000 | [diff] [blame] | 558 | if (test_and_clear_bit(PPC_MSG_CALL_FUNC_SINGLE, tgt)) { |
Milton Miller | 0641cc9 | 2008-10-10 01:56:30 +0000 | [diff] [blame] | 559 | smp_message_recv(PPC_MSG_CALL_FUNC_SINGLE); |
| 560 | } |
| 561 | #if defined(CONFIG_DEBUGGER) || defined(CONFIG_KEXEC) |
Anton Blanchard | fda9d86 | 2010-01-31 20:32:51 +0000 | [diff] [blame] | 562 | if (test_and_clear_bit(PPC_MSG_DEBUGGER_BREAK, tgt)) { |
Milton Miller | 0641cc9 | 2008-10-10 01:56:30 +0000 | [diff] [blame] | 563 | smp_message_recv(PPC_MSG_DEBUGGER_BREAK); |
| 564 | } |
| 565 | #endif |
| 566 | } |
| 567 | return IRQ_HANDLED; |
| 568 | } |
| 569 | |
| 570 | static irqreturn_t xics_ipi_action_direct(int irq, void *dev_id) |
| 571 | { |
| 572 | int cpu = smp_processor_id(); |
| 573 | |
| 574 | direct_qirr_info(cpu, 0xff); |
| 575 | |
| 576 | return xics_ipi_dispatch(cpu); |
| 577 | } |
| 578 | |
| 579 | static irqreturn_t xics_ipi_action_lpar(int irq, void *dev_id) |
| 580 | { |
| 581 | int cpu = smp_processor_id(); |
| 582 | |
| 583 | lpar_qirr_info(cpu, 0xff); |
| 584 | |
| 585 | return xics_ipi_dispatch(cpu); |
| 586 | } |
| 587 | |
| 588 | static void xics_request_ipi(void) |
| 589 | { |
| 590 | unsigned int ipi; |
| 591 | int rc; |
| 592 | |
| 593 | ipi = irq_create_mapping(xics_host, XICS_IPI); |
| 594 | BUG_ON(ipi == NO_IRQ); |
| 595 | |
| 596 | /* |
| 597 | * IPIs are marked IRQF_DISABLED as they must run with irqs |
| 598 | * disabled |
| 599 | */ |
| 600 | set_irq_handler(ipi, handle_percpu_irq); |
| 601 | if (firmware_has_feature(FW_FEATURE_LPAR)) |
Milton Miller | d879f38 | 2008-10-10 01:56:39 +0000 | [diff] [blame] | 602 | rc = request_irq(ipi, xics_ipi_action_lpar, |
| 603 | IRQF_DISABLED|IRQF_PERCPU, "IPI", NULL); |
Milton Miller | 0641cc9 | 2008-10-10 01:56:30 +0000 | [diff] [blame] | 604 | else |
Milton Miller | d879f38 | 2008-10-10 01:56:39 +0000 | [diff] [blame] | 605 | rc = request_irq(ipi, xics_ipi_action_direct, |
| 606 | IRQF_DISABLED|IRQF_PERCPU, "IPI", NULL); |
Milton Miller | 0641cc9 | 2008-10-10 01:56:30 +0000 | [diff] [blame] | 607 | BUG_ON(rc); |
| 608 | } |
| 609 | |
| 610 | int __init smp_xics_probe(void) |
| 611 | { |
| 612 | xics_request_ipi(); |
| 613 | |
| 614 | return cpus_weight(cpu_possible_map); |
| 615 | } |
| 616 | |
| 617 | #endif /* CONFIG_SMP */ |
| 618 | |
| 619 | |
| 620 | /* Initialization */ |
| 621 | |
| 622 | static void xics_update_irq_servers(void) |
| 623 | { |
| 624 | int i, j; |
| 625 | struct device_node *np; |
| 626 | u32 ilen; |
Sebastien Dugue | 1ef8014 | 2008-10-22 04:36:32 +0000 | [diff] [blame] | 627 | const u32 *ireg; |
Milton Miller | 0641cc9 | 2008-10-10 01:56:30 +0000 | [diff] [blame] | 628 | u32 hcpuid; |
| 629 | |
| 630 | /* Find the server numbers for the boot cpu. */ |
| 631 | np = of_get_cpu_node(boot_cpuid, NULL); |
| 632 | BUG_ON(!np); |
| 633 | |
| 634 | ireg = of_get_property(np, "ibm,ppc-interrupt-gserver#s", &ilen); |
| 635 | if (!ireg) { |
| 636 | of_node_put(np); |
| 637 | return; |
| 638 | } |
| 639 | |
| 640 | i = ilen / sizeof(int); |
| 641 | hcpuid = get_hard_smp_processor_id(boot_cpuid); |
| 642 | |
| 643 | /* Global interrupt distribution server is specified in the last |
| 644 | * entry of "ibm,ppc-interrupt-gserver#s" property. Get the last |
| 645 | * entry fom this property for current boot cpu id and use it as |
| 646 | * default distribution server |
| 647 | */ |
| 648 | for (j = 0; j < i; j += 2) { |
| 649 | if (ireg[j] == hcpuid) { |
| 650 | default_server = hcpuid; |
| 651 | default_distrib_server = ireg[j+1]; |
Milton Miller | 0641cc9 | 2008-10-10 01:56:30 +0000 | [diff] [blame] | 652 | } |
| 653 | } |
| 654 | |
| 655 | of_node_put(np); |
| 656 | } |
| 657 | |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 658 | static void __init xics_map_one_cpu(int hw_id, unsigned long addr, |
| 659 | unsigned long size) |
| 660 | { |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 661 | int i; |
| 662 | |
| 663 | /* This may look gross but it's good enough for now, we don't quite |
| 664 | * have a hard -> linux processor id matching. |
| 665 | */ |
| 666 | for_each_possible_cpu(i) { |
| 667 | if (!cpu_present(i)) |
| 668 | continue; |
| 669 | if (hw_id == get_hard_smp_processor_id(i)) { |
| 670 | xics_per_cpu[i] = ioremap(addr, size); |
| 671 | return; |
| 672 | } |
| 673 | } |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 674 | } |
| 675 | |
| 676 | static void __init xics_init_one_node(struct device_node *np, |
| 677 | unsigned int *indx) |
| 678 | { |
| 679 | unsigned int ilen; |
Jeremy Kerr | 954a46e | 2006-07-12 15:39:43 +1000 | [diff] [blame] | 680 | const u32 *ireg; |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 681 | |
| 682 | /* This code does the theorically broken assumption that the interrupt |
| 683 | * server numbers are the same as the hard CPU numbers. |
| 684 | * This happens to be the case so far but we are playing with fire... |
| 685 | * should be fixed one of these days. -BenH. |
| 686 | */ |
Stephen Rothwell | e2eb639 | 2007-04-03 22:26:41 +1000 | [diff] [blame] | 687 | ireg = of_get_property(np, "ibm,interrupt-server-ranges", NULL); |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 688 | |
| 689 | /* Do that ever happen ? we'll know soon enough... but even good'old |
| 690 | * f80 does have that property .. |
| 691 | */ |
| 692 | WARN_ON(ireg == NULL); |
| 693 | if (ireg) { |
| 694 | /* |
| 695 | * set node starting index for this node |
| 696 | */ |
| 697 | *indx = *ireg; |
| 698 | } |
Stephen Rothwell | e2eb639 | 2007-04-03 22:26:41 +1000 | [diff] [blame] | 699 | ireg = of_get_property(np, "reg", &ilen); |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 700 | if (!ireg) |
| 701 | panic("xics_init_IRQ: can't find interrupt reg property"); |
| 702 | |
| 703 | while (ilen >= (4 * sizeof(u32))) { |
| 704 | unsigned long addr, size; |
| 705 | |
| 706 | /* XXX Use proper OF parsing code here !!! */ |
| 707 | addr = (unsigned long)*ireg++ << 32; |
| 708 | ilen -= sizeof(u32); |
| 709 | addr |= *ireg++; |
| 710 | ilen -= sizeof(u32); |
| 711 | size = (unsigned long)*ireg++ << 32; |
| 712 | ilen -= sizeof(u32); |
| 713 | size |= *ireg++; |
| 714 | ilen -= sizeof(u32); |
| 715 | xics_map_one_cpu(*indx, addr, size); |
| 716 | (*indx)++; |
| 717 | } |
| 718 | } |
| 719 | |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 720 | void __init xics_init_IRQ(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 721 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 722 | struct device_node *np; |
Nathan Fontenot | de0723d | 2008-02-07 07:37:40 +1100 | [diff] [blame] | 723 | u32 indx = 0; |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 724 | int found = 0; |
Sebastien Dugue | 1ef8014 | 2008-10-22 04:36:32 +0000 | [diff] [blame] | 725 | const u32 *isize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 726 | |
| 727 | ppc64_boot_msg(0x20, "XICS Init"); |
| 728 | |
| 729 | ibm_get_xive = rtas_token("ibm,get-xive"); |
| 730 | ibm_set_xive = rtas_token("ibm,set-xive"); |
| 731 | ibm_int_on = rtas_token("ibm,int-on"); |
| 732 | ibm_int_off = rtas_token("ibm,int-off"); |
| 733 | |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 734 | for_each_node_by_type(np, "PowerPC-External-Interrupt-Presentation") { |
| 735 | found = 1; |
Milton Miller | a244a95 | 2008-10-10 01:56:33 +0000 | [diff] [blame] | 736 | if (firmware_has_feature(FW_FEATURE_LPAR)) { |
| 737 | of_node_put(np); |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 738 | break; |
Milton Miller | a244a95 | 2008-10-10 01:56:33 +0000 | [diff] [blame] | 739 | } |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 740 | xics_init_one_node(np, &indx); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 741 | } |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 742 | if (found == 0) |
| 743 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 744 | |
Sebastien Dugue | 1ef8014 | 2008-10-22 04:36:32 +0000 | [diff] [blame] | 745 | /* get the bit size of server numbers */ |
| 746 | found = 0; |
| 747 | |
| 748 | for_each_compatible_node(np, NULL, "ibm,ppc-xics") { |
| 749 | isize = of_get_property(np, "ibm,interrupt-server#-size", NULL); |
| 750 | |
| 751 | if (!isize) |
| 752 | continue; |
| 753 | |
| 754 | if (!found) { |
| 755 | interrupt_server_size = *isize; |
| 756 | found = 1; |
| 757 | } else if (*isize != interrupt_server_size) { |
| 758 | printk(KERN_WARNING "XICS: " |
| 759 | "mismatched ibm,interrupt-server#-size\n"); |
| 760 | interrupt_server_size = max(*isize, |
| 761 | interrupt_server_size); |
| 762 | } |
| 763 | } |
| 764 | |
Nathan Fontenot | de0723d | 2008-02-07 07:37:40 +1100 | [diff] [blame] | 765 | xics_update_irq_servers(); |
Milton Miller | 302905a | 2008-10-10 01:56:28 +0000 | [diff] [blame] | 766 | xics_init_host(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 767 | |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 768 | if (firmware_has_feature(FW_FEATURE_LPAR)) |
| 769 | ppc_md.get_irq = xics_get_irq_lpar; |
| 770 | else |
Benjamin Herrenschmidt | b9e5b4e | 2006-07-03 19:32:51 +1000 | [diff] [blame] | 771 | ppc_md.get_irq = xics_get_irq_direct; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 772 | |
Paul Mackerras | 6c80a21 | 2005-05-06 16:28:56 +1000 | [diff] [blame] | 773 | xics_setup_cpu(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 774 | |
| 775 | ppc64_boot_msg(0x21, "XICS Done"); |
| 776 | } |
| 777 | |
Milton Miller | 0641cc9 | 2008-10-10 01:56:30 +0000 | [diff] [blame] | 778 | /* Cpu startup, shutdown, and hotplug */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 779 | |
Milton Miller | 0641cc9 | 2008-10-10 01:56:30 +0000 | [diff] [blame] | 780 | static void xics_set_cpu_priority(unsigned char cppr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 781 | { |
Mark Nelson | 49bd364 | 2009-12-07 20:32:17 +0000 | [diff] [blame] | 782 | struct xics_cppr *os_cppr = &__get_cpu_var(xics_cppr); |
| 783 | |
Mark Nelson | 36350e0 | 2010-02-07 16:45:12 +0000 | [diff] [blame] | 784 | /* |
| 785 | * we only really want to set the priority when there's |
| 786 | * just one cppr value on the stack |
| 787 | */ |
| 788 | WARN_ON(os_cppr->index != 0); |
Mark Nelson | 49bd364 | 2009-12-07 20:32:17 +0000 | [diff] [blame] | 789 | |
Mark Nelson | 36350e0 | 2010-02-07 16:45:12 +0000 | [diff] [blame] | 790 | os_cppr->stack[0] = cppr; |
Mark Nelson | 49bd364 | 2009-12-07 20:32:17 +0000 | [diff] [blame] | 791 | |
Milton Miller | 0641cc9 | 2008-10-10 01:56:30 +0000 | [diff] [blame] | 792 | if (firmware_has_feature(FW_FEATURE_LPAR)) |
| 793 | lpar_cppr_info(cppr); |
| 794 | else |
| 795 | direct_cppr_info(cppr); |
| 796 | iosync(); |
| 797 | } |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 798 | |
Milton Miller | b496325 | 2008-10-10 01:56:34 +0000 | [diff] [blame] | 799 | /* Have the calling processor join or leave the specified global queue */ |
| 800 | static void xics_set_cpu_giq(unsigned int gserver, unsigned int join) |
| 801 | { |
Nathan Lynch | edc72ac | 2008-12-11 09:14:25 +0000 | [diff] [blame] | 802 | int index; |
| 803 | int status; |
| 804 | |
| 805 | if (!rtas_indicator_present(GLOBAL_INTERRUPT_QUEUE, NULL)) |
| 806 | return; |
| 807 | |
| 808 | index = (1UL << interrupt_server_size) - 1 - gserver; |
| 809 | |
| 810 | status = rtas_set_indicator_fast(GLOBAL_INTERRUPT_QUEUE, index, join); |
| 811 | |
| 812 | WARN(status < 0, "set-indicator(%d, %d, %u) returned %d\n", |
| 813 | GLOBAL_INTERRUPT_QUEUE, index, join, status); |
Milton Miller | b496325 | 2008-10-10 01:56:34 +0000 | [diff] [blame] | 814 | } |
Milton Miller | 0641cc9 | 2008-10-10 01:56:30 +0000 | [diff] [blame] | 815 | |
| 816 | void xics_setup_cpu(void) |
| 817 | { |
Mark Nelson | 49bd364 | 2009-12-07 20:32:17 +0000 | [diff] [blame] | 818 | xics_set_cpu_priority(LOWEST_PRIORITY); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 819 | |
Milton Miller | b496325 | 2008-10-10 01:56:34 +0000 | [diff] [blame] | 820 | xics_set_cpu_giq(default_distrib_server, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 821 | } |
Milton Miller | d13f720 | 2008-10-10 01:56:29 +0000 | [diff] [blame] | 822 | |
Al Viro | f10095c | 2008-03-29 03:10:38 +0000 | [diff] [blame] | 823 | void xics_teardown_cpu(void) |
R Sharada | fce0d57 | 2005-06-25 14:58:10 -0700 | [diff] [blame] | 824 | { |
Mark Nelson | 36350e0 | 2010-02-07 16:45:12 +0000 | [diff] [blame] | 825 | struct xics_cppr *os_cppr = &__get_cpu_var(xics_cppr); |
R Sharada | fce0d57 | 2005-06-25 14:58:10 -0700 | [diff] [blame] | 826 | int cpu = smp_processor_id(); |
R Sharada | fce0d57 | 2005-06-25 14:58:10 -0700 | [diff] [blame] | 827 | |
Mark Nelson | 36350e0 | 2010-02-07 16:45:12 +0000 | [diff] [blame] | 828 | /* |
| 829 | * we have to reset the cppr index to 0 because we're |
| 830 | * not going to return from the IPI |
| 831 | */ |
| 832 | os_cppr->index = 0; |
Milton Miller | d7cf0ed | 2007-12-14 15:52:09 +1100 | [diff] [blame] | 833 | xics_set_cpu_priority(0); |
Haren Myneni | 81bbbe9 | 2006-04-05 21:10:18 -0600 | [diff] [blame] | 834 | |
Milton Miller | b496325 | 2008-10-10 01:56:34 +0000 | [diff] [blame] | 835 | /* Clear any pending IPI request */ |
Benjamin Herrenschmidt | 6e99e45 | 2006-07-10 04:44:42 -0700 | [diff] [blame] | 836 | if (firmware_has_feature(FW_FEATURE_LPAR)) |
| 837 | lpar_qirr_info(cpu, 0xff); |
| 838 | else |
| 839 | direct_qirr_info(cpu, 0xff); |
Nathan Fontenot | c3e8506 | 2008-02-07 07:37:31 +1100 | [diff] [blame] | 840 | } |
| 841 | |
| 842 | void xics_kexec_teardown_cpu(int secondary) |
| 843 | { |
Nathan Fontenot | c3e8506 | 2008-02-07 07:37:31 +1100 | [diff] [blame] | 844 | xics_teardown_cpu(); |
Benjamin Herrenschmidt | 6e99e45 | 2006-07-10 04:44:42 -0700 | [diff] [blame] | 845 | |
| 846 | /* |
Milton Miller | 1a57c92 | 2008-10-10 01:56:35 +0000 | [diff] [blame] | 847 | * we take the ipi irq but and never return so we |
| 848 | * need to EOI the IPI, but want to leave our priority 0 |
Haren Myneni | 81bbbe9 | 2006-04-05 21:10:18 -0600 | [diff] [blame] | 849 | * |
Milton Miller | 1a57c92 | 2008-10-10 01:56:35 +0000 | [diff] [blame] | 850 | * should we check all the other interrupts too? |
Haren Myneni | 81bbbe9 | 2006-04-05 21:10:18 -0600 | [diff] [blame] | 851 | * should we be flagging idle loop instead? |
| 852 | * or creating some task to be scheduled? |
| 853 | */ |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 854 | |
Milton Miller | 1a57c92 | 2008-10-10 01:56:35 +0000 | [diff] [blame] | 855 | if (firmware_has_feature(FW_FEATURE_LPAR)) |
| 856 | lpar_xirr_info_set((0x00 << 24) | XICS_IPI); |
| 857 | else |
| 858 | direct_xirr_info_set((0x00 << 24) | XICS_IPI); |
Haren Myneni | 81bbbe9 | 2006-04-05 21:10:18 -0600 | [diff] [blame] | 859 | |
R Sharada | fce0d57 | 2005-06-25 14:58:10 -0700 | [diff] [blame] | 860 | /* |
Paul Mackerras | 6d22d85 | 2005-08-04 12:53:37 -0700 | [diff] [blame] | 861 | * Some machines need to have at least one cpu in the GIQ, |
| 862 | * so leave the master cpu in the group. |
R Sharada | fce0d57 | 2005-06-25 14:58:10 -0700 | [diff] [blame] | 863 | */ |
Haren Myneni | 81bbbe9 | 2006-04-05 21:10:18 -0600 | [diff] [blame] | 864 | if (secondary) |
Milton Miller | b496325 | 2008-10-10 01:56:34 +0000 | [diff] [blame] | 865 | xics_set_cpu_giq(default_distrib_server, 0); |
R Sharada | fce0d57 | 2005-06-25 14:58:10 -0700 | [diff] [blame] | 866 | } |
| 867 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 868 | #ifdef CONFIG_HOTPLUG_CPU |
| 869 | |
| 870 | /* Interrupts are disabled. */ |
| 871 | void xics_migrate_irqs_away(void) |
| 872 | { |
Milton Miller | d7cf0ed | 2007-12-14 15:52:09 +1100 | [diff] [blame] | 873 | int cpu = smp_processor_id(), hw_cpu = hard_smp_processor_id(); |
| 874 | unsigned int irq, virq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 875 | |
Milton Miller | 302905a | 2008-10-10 01:56:28 +0000 | [diff] [blame] | 876 | /* If we used to be the default server, move to the new "boot_cpuid" */ |
| 877 | if (hw_cpu == default_server) |
| 878 | xics_update_irq_servers(); |
| 879 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 880 | /* Reject any interrupt that was queued to us... */ |
Milton Miller | d7cf0ed | 2007-12-14 15:52:09 +1100 | [diff] [blame] | 881 | xics_set_cpu_priority(0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 882 | |
Milton Miller | b496325 | 2008-10-10 01:56:34 +0000 | [diff] [blame] | 883 | /* Remove ourselves from the global interrupt queue */ |
| 884 | xics_set_cpu_giq(default_distrib_server, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 885 | |
| 886 | /* Allow IPIs again... */ |
Milton Miller | d7cf0ed | 2007-12-14 15:52:09 +1100 | [diff] [blame] | 887 | xics_set_cpu_priority(DEFAULT_PRIORITY); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 888 | |
| 889 | for_each_irq(virq) { |
Benjamin Herrenschmidt | b9e5b4e | 2006-07-03 19:32:51 +1000 | [diff] [blame] | 890 | struct irq_desc *desc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 891 | int xics_status[2]; |
Milton Miller | b496325 | 2008-10-10 01:56:34 +0000 | [diff] [blame] | 892 | int status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 893 | unsigned long flags; |
| 894 | |
| 895 | /* We cant set affinity on ISA interrupts */ |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 896 | if (virq < NUM_ISA_INTERRUPTS) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 897 | continue; |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 898 | if (irq_map[virq].host != xics_host) |
| 899 | continue; |
| 900 | irq = (unsigned int)irq_map[virq].hwirq; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 901 | /* We need to get IPIs still. */ |
Benjamin Herrenschmidt | 0ebfff1 | 2006-07-03 21:36:01 +1000 | [diff] [blame] | 902 | if (irq == XICS_IPI || irq == XICS_IRQ_SPURIOUS) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 903 | continue; |
Michael Ellerman | 6cff46f | 2009-10-13 19:44:51 +0000 | [diff] [blame] | 904 | desc = irq_to_desc(virq); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 905 | |
| 906 | /* We only need to migrate enabled IRQS */ |
Ingo Molnar | d1bef4e | 2006-06-29 02:24:36 -0700 | [diff] [blame] | 907 | if (desc == NULL || desc->chip == NULL |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 908 | || desc->action == NULL |
Ingo Molnar | d1bef4e | 2006-06-29 02:24:36 -0700 | [diff] [blame] | 909 | || desc->chip->set_affinity == NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 910 | continue; |
| 911 | |
Thomas Gleixner | 239007b | 2009-11-17 16:46:45 +0100 | [diff] [blame] | 912 | raw_spin_lock_irqsave(&desc->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 913 | |
| 914 | status = rtas_call(ibm_get_xive, 1, 3, xics_status, irq); |
| 915 | if (status) { |
Milton Miller | 2172fe8 | 2008-10-10 01:56:39 +0000 | [diff] [blame] | 916 | printk(KERN_ERR "%s: ibm,get-xive irq=%u returns %d\n", |
| 917 | __func__, irq, status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 918 | goto unlock; |
| 919 | } |
| 920 | |
| 921 | /* |
| 922 | * We only support delivery to all cpus or to one cpu. |
| 923 | * The irq has to be migrated only in the single cpu |
| 924 | * case. |
| 925 | */ |
Milton Miller | d7cf0ed | 2007-12-14 15:52:09 +1100 | [diff] [blame] | 926 | if (xics_status[0] != hw_cpu) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 927 | goto unlock; |
| 928 | |
Anton Blanchard | 2637032 | 2005-09-12 13:12:11 +1000 | [diff] [blame] | 929 | printk(KERN_WARNING "IRQ %u affinity broken off cpu %u\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 930 | virq, cpu); |
| 931 | |
| 932 | /* Reset affinity to all cpus */ |
Michael Ellerman | 6cff46f | 2009-10-13 19:44:51 +0000 | [diff] [blame] | 933 | cpumask_setall(irq_to_desc(virq)->affinity); |
Rusty Russell | 0de2652 | 2008-12-13 21:20:26 +1030 | [diff] [blame] | 934 | desc->chip->set_affinity(virq, cpu_all_mask); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 935 | unlock: |
Thomas Gleixner | 239007b | 2009-11-17 16:46:45 +0100 | [diff] [blame] | 936 | raw_spin_unlock_irqrestore(&desc->lock, flags); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 937 | } |
| 938 | } |
| 939 | #endif |