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 | */ |
| 11 | #include <linux/config.h> |
| 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> |
| 18 | #include <linux/signal.h> |
| 19 | #include <linux/init.h> |
| 20 | #include <linux/gfp.h> |
| 21 | #include <linux/radix-tree.h> |
| 22 | #include <linux/cpu.h> |
Michael Ellerman | 57cfb81 | 2006-03-21 20:45:59 +1100 | [diff] [blame] | 23 | #include <asm/firmware.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | #include <asm/prom.h> |
| 25 | #include <asm/io.h> |
| 26 | #include <asm/pgtable.h> |
| 27 | #include <asm/smp.h> |
| 28 | #include <asm/rtas.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | #include <asm/hvcall.h> |
| 30 | #include <asm/machdep.h> |
Paul Mackerras | 2227718 | 2005-10-28 11:47:17 +1000 | [diff] [blame] | 31 | #include <asm/i8259.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" |
| 34 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | static unsigned int xics_startup(unsigned int irq); |
| 36 | static void xics_enable_irq(unsigned int irq); |
| 37 | static void xics_disable_irq(unsigned int irq); |
| 38 | static void xics_mask_and_ack_irq(unsigned int irq); |
| 39 | static void xics_end_irq(unsigned int irq); |
| 40 | static void xics_set_affinity(unsigned int irq_nr, cpumask_t cpumask); |
| 41 | |
Anton Blanchard | 2637032 | 2005-09-12 13:12:11 +1000 | [diff] [blame] | 42 | static struct hw_interrupt_type xics_pic = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | .typename = " XICS ", |
| 44 | .startup = xics_startup, |
| 45 | .enable = xics_enable_irq, |
| 46 | .disable = xics_disable_irq, |
| 47 | .ack = xics_mask_and_ack_irq, |
| 48 | .end = xics_end_irq, |
| 49 | .set_affinity = xics_set_affinity |
| 50 | }; |
| 51 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | /* This is used to map real irq numbers to virtual */ |
| 53 | static struct radix_tree_root irq_map = RADIX_TREE_INIT(GFP_ATOMIC); |
| 54 | |
| 55 | #define XICS_IPI 2 |
| 56 | #define XICS_IRQ_SPURIOUS 0 |
| 57 | |
| 58 | /* Want a priority other than 0. Various HW issues require this. */ |
| 59 | #define DEFAULT_PRIORITY 5 |
| 60 | |
David Gibson | 007e8f5 | 2005-10-28 15:35:50 +1000 | [diff] [blame] | 61 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | * Mark IPIs as higher priority so we can take them inside interrupts that |
| 63 | * arent marked SA_INTERRUPT |
| 64 | */ |
| 65 | #define IPI_PRIORITY 4 |
| 66 | |
| 67 | struct xics_ipl { |
| 68 | union { |
| 69 | u32 word; |
| 70 | u8 bytes[4]; |
| 71 | } xirr_poll; |
| 72 | union { |
| 73 | u32 word; |
| 74 | u8 bytes[4]; |
| 75 | } xirr; |
| 76 | u32 dummy; |
| 77 | union { |
| 78 | u32 word; |
| 79 | u8 bytes[4]; |
| 80 | } qirr; |
| 81 | }; |
| 82 | |
| 83 | static struct xics_ipl __iomem *xics_per_cpu[NR_CPUS]; |
| 84 | |
| 85 | static int xics_irq_8259_cascade = 0; |
| 86 | static int xics_irq_8259_cascade_real = 0; |
| 87 | static unsigned int default_server = 0xFF; |
Anton Blanchard | 2637032 | 2005-09-12 13:12:11 +1000 | [diff] [blame] | 88 | static unsigned int default_distrib_server = 0; |
| 89 | static unsigned int interrupt_server_size = 8; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 90 | |
| 91 | /* |
| 92 | * XICS only has a single IPI, so encode the messages per CPU |
| 93 | */ |
| 94 | struct xics_ipi_struct xics_ipi_message[NR_CPUS] __cacheline_aligned; |
| 95 | |
| 96 | /* RTAS service tokens */ |
Anton Blanchard | 2637032 | 2005-09-12 13:12:11 +1000 | [diff] [blame] | 97 | static int ibm_get_xive; |
| 98 | static int ibm_set_xive; |
| 99 | static int ibm_int_on; |
| 100 | static int ibm_int_off; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 101 | |
| 102 | typedef struct { |
| 103 | int (*xirr_info_get)(int cpu); |
| 104 | void (*xirr_info_set)(int cpu, int val); |
| 105 | void (*cppr_info)(int cpu, u8 val); |
| 106 | void (*qirr_info)(int cpu, u8 val); |
| 107 | } xics_ops; |
| 108 | |
| 109 | |
| 110 | /* SMP */ |
| 111 | |
| 112 | static int pSeries_xirr_info_get(int n_cpu) |
| 113 | { |
| 114 | return in_be32(&xics_per_cpu[n_cpu]->xirr.word); |
| 115 | } |
| 116 | |
| 117 | static void pSeries_xirr_info_set(int n_cpu, int value) |
| 118 | { |
| 119 | out_be32(&xics_per_cpu[n_cpu]->xirr.word, value); |
| 120 | } |
| 121 | |
| 122 | static void pSeries_cppr_info(int n_cpu, u8 value) |
| 123 | { |
| 124 | out_8(&xics_per_cpu[n_cpu]->xirr.bytes[0], value); |
| 125 | } |
| 126 | |
| 127 | static void pSeries_qirr_info(int n_cpu, u8 value) |
| 128 | { |
| 129 | out_8(&xics_per_cpu[n_cpu]->qirr.bytes[0], value); |
| 130 | } |
| 131 | |
| 132 | static xics_ops pSeries_ops = { |
| 133 | pSeries_xirr_info_get, |
| 134 | pSeries_xirr_info_set, |
| 135 | pSeries_cppr_info, |
| 136 | pSeries_qirr_info |
| 137 | }; |
| 138 | |
| 139 | static xics_ops *ops = &pSeries_ops; |
| 140 | |
| 141 | |
| 142 | /* LPAR */ |
| 143 | |
| 144 | static inline long plpar_eoi(unsigned long xirr) |
| 145 | { |
| 146 | return plpar_hcall_norets(H_EOI, xirr); |
| 147 | } |
| 148 | |
| 149 | static inline long plpar_cppr(unsigned long cppr) |
| 150 | { |
| 151 | return plpar_hcall_norets(H_CPPR, cppr); |
| 152 | } |
| 153 | |
| 154 | static inline long plpar_ipi(unsigned long servernum, unsigned long mfrr) |
| 155 | { |
| 156 | return plpar_hcall_norets(H_IPI, servernum, mfrr); |
| 157 | } |
| 158 | |
| 159 | static inline long plpar_xirr(unsigned long *xirr_ret) |
| 160 | { |
| 161 | unsigned long dummy; |
| 162 | return plpar_hcall(H_XIRR, 0, 0, 0, 0, xirr_ret, &dummy, &dummy); |
| 163 | } |
| 164 | |
| 165 | static int pSeriesLP_xirr_info_get(int n_cpu) |
| 166 | { |
| 167 | unsigned long lpar_rc; |
David Gibson | 007e8f5 | 2005-10-28 15:35:50 +1000 | [diff] [blame] | 168 | unsigned long return_value; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 169 | |
| 170 | lpar_rc = plpar_xirr(&return_value); |
| 171 | if (lpar_rc != H_Success) |
David Gibson | 007e8f5 | 2005-10-28 15:35:50 +1000 | [diff] [blame] | 172 | panic(" bad return code xirr - rc = %lx \n", lpar_rc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | return (int)return_value; |
| 174 | } |
| 175 | |
| 176 | static void pSeriesLP_xirr_info_set(int n_cpu, int value) |
| 177 | { |
| 178 | unsigned long lpar_rc; |
| 179 | unsigned long val64 = value & 0xffffffff; |
| 180 | |
| 181 | lpar_rc = plpar_eoi(val64); |
| 182 | if (lpar_rc != H_Success) |
| 183 | panic("bad return code EOI - rc = %ld, value=%lx\n", lpar_rc, |
David Gibson | 007e8f5 | 2005-10-28 15:35:50 +1000 | [diff] [blame] | 184 | val64); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | } |
| 186 | |
| 187 | void pSeriesLP_cppr_info(int n_cpu, u8 value) |
| 188 | { |
| 189 | unsigned long lpar_rc; |
| 190 | |
| 191 | lpar_rc = plpar_cppr(value); |
| 192 | if (lpar_rc != H_Success) |
David Gibson | 007e8f5 | 2005-10-28 15:35:50 +1000 | [diff] [blame] | 193 | panic("bad return code cppr - rc = %lx\n", lpar_rc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 194 | } |
| 195 | |
| 196 | static void pSeriesLP_qirr_info(int n_cpu , u8 value) |
| 197 | { |
| 198 | unsigned long lpar_rc; |
| 199 | |
| 200 | lpar_rc = plpar_ipi(get_hard_smp_processor_id(n_cpu), value); |
| 201 | if (lpar_rc != H_Success) |
David Gibson | 007e8f5 | 2005-10-28 15:35:50 +1000 | [diff] [blame] | 202 | panic("bad return code qirr - rc = %lx\n", lpar_rc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | } |
| 204 | |
| 205 | xics_ops pSeriesLP_ops = { |
| 206 | pSeriesLP_xirr_info_get, |
| 207 | pSeriesLP_xirr_info_set, |
| 208 | pSeriesLP_cppr_info, |
| 209 | pSeriesLP_qirr_info |
| 210 | }; |
| 211 | |
| 212 | static unsigned int xics_startup(unsigned int virq) |
| 213 | { |
| 214 | unsigned int irq; |
| 215 | |
| 216 | irq = irq_offset_down(virq); |
| 217 | if (radix_tree_insert(&irq_map, virt_irq_to_real(irq), |
| 218 | &virt_irq_to_real_map[irq]) == -ENOMEM) |
| 219 | printk(KERN_CRIT "Out of memory creating real -> virtual" |
| 220 | " IRQ mapping for irq %u (real 0x%x)\n", |
| 221 | virq, virt_irq_to_real(irq)); |
| 222 | xics_enable_irq(virq); |
| 223 | return 0; /* return value is ignored */ |
| 224 | } |
| 225 | |
| 226 | static unsigned int real_irq_to_virt(unsigned int real_irq) |
| 227 | { |
| 228 | unsigned int *ptr; |
| 229 | |
| 230 | ptr = radix_tree_lookup(&irq_map, real_irq); |
| 231 | if (ptr == NULL) |
| 232 | return NO_IRQ; |
| 233 | return ptr - virt_irq_to_real_map; |
| 234 | } |
| 235 | |
| 236 | #ifdef CONFIG_SMP |
| 237 | static int get_irq_server(unsigned int irq) |
| 238 | { |
| 239 | unsigned int server; |
| 240 | /* For the moment only implement delivery to all cpus or one cpu */ |
| 241 | cpumask_t cpumask = irq_affinity[irq]; |
| 242 | cpumask_t tmp = CPU_MASK_NONE; |
| 243 | |
| 244 | if (!distribute_irqs) |
| 245 | return default_server; |
| 246 | |
| 247 | if (cpus_equal(cpumask, CPU_MASK_ALL)) { |
| 248 | server = default_distrib_server; |
| 249 | } else { |
| 250 | cpus_and(tmp, cpu_online_map, cpumask); |
| 251 | |
| 252 | if (cpus_empty(tmp)) |
| 253 | server = default_distrib_server; |
| 254 | else |
| 255 | server = get_hard_smp_processor_id(first_cpu(tmp)); |
| 256 | } |
| 257 | |
| 258 | return server; |
| 259 | |
| 260 | } |
| 261 | #else |
| 262 | static int get_irq_server(unsigned int irq) |
| 263 | { |
| 264 | return default_server; |
| 265 | } |
| 266 | #endif |
| 267 | |
| 268 | static void xics_enable_irq(unsigned int virq) |
| 269 | { |
| 270 | unsigned int irq; |
| 271 | int call_status; |
| 272 | unsigned int server; |
| 273 | |
| 274 | irq = virt_irq_to_real(irq_offset_down(virq)); |
| 275 | if (irq == XICS_IPI) |
| 276 | return; |
| 277 | |
| 278 | server = get_irq_server(virq); |
| 279 | call_status = rtas_call(ibm_set_xive, 3, 1, NULL, irq, server, |
| 280 | DEFAULT_PRIORITY); |
| 281 | if (call_status != 0) { |
Anton Blanchard | 2637032 | 2005-09-12 13:12:11 +1000 | [diff] [blame] | 282 | printk(KERN_ERR "xics_enable_irq: irq=%u: ibm_set_xive " |
| 283 | "returned %d\n", irq, call_status); |
| 284 | printk("set_xive %x, server %x\n", ibm_set_xive, server); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 285 | return; |
| 286 | } |
| 287 | |
| 288 | /* Now unmask the interrupt (often a no-op) */ |
| 289 | call_status = rtas_call(ibm_int_on, 1, 1, NULL, irq); |
| 290 | if (call_status != 0) { |
Anton Blanchard | 2637032 | 2005-09-12 13:12:11 +1000 | [diff] [blame] | 291 | printk(KERN_ERR "xics_enable_irq: irq=%u: ibm_int_on " |
| 292 | "returned %d\n", irq, call_status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 293 | return; |
| 294 | } |
| 295 | } |
| 296 | |
| 297 | static void xics_disable_real_irq(unsigned int irq) |
| 298 | { |
| 299 | int call_status; |
| 300 | unsigned int server; |
| 301 | |
| 302 | if (irq == XICS_IPI) |
| 303 | return; |
| 304 | |
| 305 | call_status = rtas_call(ibm_int_off, 1, 1, NULL, irq); |
| 306 | if (call_status != 0) { |
Anton Blanchard | 2637032 | 2005-09-12 13:12:11 +1000 | [diff] [blame] | 307 | printk(KERN_ERR "xics_disable_real_irq: irq=%u: " |
| 308 | "ibm_int_off returned %d\n", irq, call_status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 309 | return; |
| 310 | } |
| 311 | |
| 312 | server = get_irq_server(irq); |
| 313 | /* Have to set XIVE to 0xff to be able to remove a slot */ |
| 314 | call_status = rtas_call(ibm_set_xive, 3, 1, NULL, irq, server, 0xff); |
| 315 | if (call_status != 0) { |
Anton Blanchard | 2637032 | 2005-09-12 13:12:11 +1000 | [diff] [blame] | 316 | printk(KERN_ERR "xics_disable_irq: irq=%u: ibm_set_xive(0xff)" |
| 317 | " returned %d\n", irq, call_status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 318 | return; |
| 319 | } |
| 320 | } |
| 321 | |
| 322 | static void xics_disable_irq(unsigned int virq) |
| 323 | { |
| 324 | unsigned int irq; |
| 325 | |
| 326 | irq = virt_irq_to_real(irq_offset_down(virq)); |
| 327 | xics_disable_real_irq(irq); |
| 328 | } |
| 329 | |
| 330 | static void xics_end_irq(unsigned int irq) |
| 331 | { |
| 332 | int cpu = smp_processor_id(); |
| 333 | |
| 334 | iosync(); |
| 335 | ops->xirr_info_set(cpu, ((0xff << 24) | |
| 336 | (virt_irq_to_real(irq_offset_down(irq))))); |
| 337 | |
| 338 | } |
| 339 | |
| 340 | static void xics_mask_and_ack_irq(unsigned int irq) |
| 341 | { |
| 342 | int cpu = smp_processor_id(); |
| 343 | |
| 344 | if (irq < irq_offset_value()) { |
| 345 | i8259_pic.ack(irq); |
| 346 | iosync(); |
| 347 | ops->xirr_info_set(cpu, ((0xff<<24) | |
| 348 | xics_irq_8259_cascade_real)); |
| 349 | iosync(); |
| 350 | } |
| 351 | } |
| 352 | |
| 353 | int xics_get_irq(struct pt_regs *regs) |
| 354 | { |
| 355 | unsigned int cpu = smp_processor_id(); |
| 356 | unsigned int vec; |
| 357 | int irq; |
| 358 | |
| 359 | vec = ops->xirr_info_get(cpu); |
| 360 | /* (vec >> 24) == old priority */ |
| 361 | vec &= 0x00ffffff; |
| 362 | |
| 363 | /* for sanity, this had better be < NR_IRQS - 16 */ |
| 364 | if (vec == xics_irq_8259_cascade_real) { |
Paul Mackerras | 2227718 | 2005-10-28 11:47:17 +1000 | [diff] [blame] | 365 | irq = i8259_irq(regs); |
Paul Mackerras | 8b1af56 | 2005-12-22 21:55:37 +1100 | [diff] [blame] | 366 | xics_end_irq(irq_offset_up(xics_irq_8259_cascade)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | } else if (vec == XICS_IRQ_SPURIOUS) { |
| 368 | irq = -1; |
| 369 | } else { |
| 370 | irq = real_irq_to_virt(vec); |
| 371 | if (irq == NO_IRQ) |
| 372 | irq = real_irq_to_virt_slowpath(vec); |
| 373 | if (irq == NO_IRQ) { |
Anton Blanchard | 2637032 | 2005-09-12 13:12:11 +1000 | [diff] [blame] | 374 | printk(KERN_ERR "Interrupt %u (real) is invalid," |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 375 | " disabling it.\n", vec); |
| 376 | xics_disable_real_irq(vec); |
| 377 | } else |
| 378 | irq = irq_offset_up(irq); |
| 379 | } |
| 380 | return irq; |
| 381 | } |
| 382 | |
| 383 | #ifdef CONFIG_SMP |
| 384 | |
Arnd Bergmann | 8446196 | 2006-01-11 00:00:02 +0000 | [diff] [blame] | 385 | static irqreturn_t xics_ipi_action(int irq, void *dev_id, struct pt_regs *regs) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 386 | { |
| 387 | int cpu = smp_processor_id(); |
| 388 | |
| 389 | ops->qirr_info(cpu, 0xff); |
| 390 | |
| 391 | WARN_ON(cpu_is_offline(cpu)); |
| 392 | |
| 393 | while (xics_ipi_message[cpu].value) { |
| 394 | if (test_and_clear_bit(PPC_MSG_CALL_FUNCTION, |
| 395 | &xics_ipi_message[cpu].value)) { |
| 396 | mb(); |
| 397 | smp_message_recv(PPC_MSG_CALL_FUNCTION, regs); |
| 398 | } |
| 399 | if (test_and_clear_bit(PPC_MSG_RESCHEDULE, |
| 400 | &xics_ipi_message[cpu].value)) { |
| 401 | mb(); |
| 402 | smp_message_recv(PPC_MSG_RESCHEDULE, regs); |
| 403 | } |
| 404 | #if 0 |
| 405 | if (test_and_clear_bit(PPC_MSG_MIGRATE_TASK, |
| 406 | &xics_ipi_message[cpu].value)) { |
| 407 | mb(); |
| 408 | smp_message_recv(PPC_MSG_MIGRATE_TASK, regs); |
| 409 | } |
| 410 | #endif |
Michael Ellerman | cc53291 | 2005-12-04 18:39:43 +1100 | [diff] [blame] | 411 | #if defined(CONFIG_DEBUGGER) || defined(CONFIG_KEXEC) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | if (test_and_clear_bit(PPC_MSG_DEBUGGER_BREAK, |
| 413 | &xics_ipi_message[cpu].value)) { |
| 414 | mb(); |
| 415 | smp_message_recv(PPC_MSG_DEBUGGER_BREAK, regs); |
| 416 | } |
| 417 | #endif |
| 418 | } |
| 419 | return IRQ_HANDLED; |
| 420 | } |
| 421 | |
| 422 | void xics_cause_IPI(int cpu) |
| 423 | { |
| 424 | ops->qirr_info(cpu, IPI_PRIORITY); |
| 425 | } |
Paul Mackerras | 6c80a21 | 2005-05-06 16:28:56 +1000 | [diff] [blame] | 426 | #endif /* CONFIG_SMP */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 427 | |
| 428 | void xics_setup_cpu(void) |
| 429 | { |
| 430 | int cpu = smp_processor_id(); |
| 431 | |
| 432 | ops->cppr_info(cpu, 0xff); |
| 433 | iosync(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 434 | |
Paul Mackerras | 6c80a21 | 2005-05-06 16:28:56 +1000 | [diff] [blame] | 435 | /* |
| 436 | * Put the calling processor into the GIQ. This is really only |
| 437 | * necessary from a secondary thread as the OF start-cpu interface |
| 438 | * performs this function for us on primary threads. |
| 439 | * |
| 440 | * XXX: undo of teardown on kexec needs this too, as may hotplug |
| 441 | */ |
| 442 | rtas_set_indicator(GLOBAL_INTERRUPT_QUEUE, |
| 443 | (1UL << interrupt_server_size) - 1 - default_distrib_server, 1); |
| 444 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 445 | |
| 446 | void xics_init_IRQ(void) |
| 447 | { |
| 448 | int i; |
| 449 | unsigned long intr_size = 0; |
| 450 | struct device_node *np; |
| 451 | uint *ireg, ilen, indx = 0; |
| 452 | unsigned long intr_base = 0; |
| 453 | struct xics_interrupt_node { |
| 454 | unsigned long addr; |
| 455 | unsigned long size; |
David Gibson | 007e8f5 | 2005-10-28 15:35:50 +1000 | [diff] [blame] | 456 | } intnodes[NR_CPUS]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 457 | |
| 458 | ppc64_boot_msg(0x20, "XICS Init"); |
| 459 | |
| 460 | ibm_get_xive = rtas_token("ibm,get-xive"); |
| 461 | ibm_set_xive = rtas_token("ibm,set-xive"); |
| 462 | ibm_int_on = rtas_token("ibm,int-on"); |
| 463 | ibm_int_off = rtas_token("ibm,int-off"); |
| 464 | |
| 465 | np = of_find_node_by_type(NULL, "PowerPC-External-Interrupt-Presentation"); |
| 466 | if (!np) |
| 467 | panic("xics_init_IRQ: can't find interrupt presentation"); |
| 468 | |
| 469 | nextnode: |
| 470 | ireg = (uint *)get_property(np, "ibm,interrupt-server-ranges", NULL); |
| 471 | if (ireg) { |
| 472 | /* |
| 473 | * set node starting index for this node |
| 474 | */ |
| 475 | indx = *ireg; |
| 476 | } |
| 477 | |
| 478 | ireg = (uint *)get_property(np, "reg", &ilen); |
| 479 | if (!ireg) |
| 480 | panic("xics_init_IRQ: can't find interrupt reg property"); |
David Gibson | 007e8f5 | 2005-10-28 15:35:50 +1000 | [diff] [blame] | 481 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 482 | while (ilen) { |
| 483 | intnodes[indx].addr = (unsigned long)*ireg++ << 32; |
| 484 | ilen -= sizeof(uint); |
| 485 | intnodes[indx].addr |= *ireg++; |
| 486 | ilen -= sizeof(uint); |
| 487 | intnodes[indx].size = (unsigned long)*ireg++ << 32; |
| 488 | ilen -= sizeof(uint); |
| 489 | intnodes[indx].size |= *ireg++; |
| 490 | ilen -= sizeof(uint); |
| 491 | indx++; |
| 492 | if (indx >= NR_CPUS) break; |
| 493 | } |
| 494 | |
| 495 | np = of_find_node_by_type(np, "PowerPC-External-Interrupt-Presentation"); |
| 496 | if ((indx < NR_CPUS) && np) goto nextnode; |
| 497 | |
| 498 | /* Find the server numbers for the boot cpu. */ |
| 499 | for (np = of_find_node_by_type(NULL, "cpu"); |
| 500 | np; |
| 501 | np = of_find_node_by_type(np, "cpu")) { |
| 502 | ireg = (uint *)get_property(np, "reg", &ilen); |
Anton Blanchard | 4df2046 | 2006-03-25 17:25:17 +1100 | [diff] [blame] | 503 | if (ireg && ireg[0] == get_hard_smp_processor_id(boot_cpuid)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 504 | ireg = (uint *)get_property(np, "ibm,ppc-interrupt-gserver#s", |
| 505 | &ilen); |
| 506 | i = ilen / sizeof(int); |
| 507 | if (ireg && i > 0) { |
| 508 | default_server = ireg[0]; |
| 509 | default_distrib_server = ireg[i-1]; /* take last element */ |
| 510 | } |
| 511 | ireg = (uint *)get_property(np, |
| 512 | "ibm,interrupt-server#-size", NULL); |
| 513 | if (ireg) |
| 514 | interrupt_server_size = *ireg; |
| 515 | break; |
| 516 | } |
| 517 | } |
| 518 | of_node_put(np); |
| 519 | |
| 520 | intr_base = intnodes[0].addr; |
| 521 | intr_size = intnodes[0].size; |
| 522 | |
| 523 | np = of_find_node_by_type(NULL, "interrupt-controller"); |
| 524 | if (!np) { |
| 525 | printk(KERN_WARNING "xics: no ISA interrupt controller\n"); |
| 526 | xics_irq_8259_cascade_real = -1; |
| 527 | xics_irq_8259_cascade = -1; |
| 528 | } else { |
| 529 | ireg = (uint *) get_property(np, "interrupts", NULL); |
| 530 | if (!ireg) |
| 531 | panic("xics_init_IRQ: can't find ISA interrupts property"); |
| 532 | |
| 533 | xics_irq_8259_cascade_real = *ireg; |
| 534 | xics_irq_8259_cascade |
| 535 | = virt_irq_create_mapping(xics_irq_8259_cascade_real); |
Paul Mackerras | 8b1af56 | 2005-12-22 21:55:37 +1100 | [diff] [blame] | 536 | i8259_init(0, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 537 | of_node_put(np); |
| 538 | } |
| 539 | |
Michael Ellerman | 57cfb81 | 2006-03-21 20:45:59 +1100 | [diff] [blame] | 540 | if (firmware_has_feature(FW_FEATURE_LPAR)) |
Paul Mackerras | 799d604 | 2005-11-10 13:37:51 +1100 | [diff] [blame] | 541 | ops = &pSeriesLP_ops; |
| 542 | else { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 543 | #ifdef CONFIG_SMP |
KAMEZAWA Hiroyuki | 0e55195 | 2006-03-28 14:50:51 -0800 | [diff] [blame] | 544 | for_each_possible_cpu(i) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 545 | int hard_id; |
| 546 | |
| 547 | /* FIXME: Do this dynamically! --RR */ |
| 548 | if (!cpu_present(i)) |
| 549 | continue; |
| 550 | |
| 551 | hard_id = get_hard_smp_processor_id(i); |
David Gibson | 007e8f5 | 2005-10-28 15:35:50 +1000 | [diff] [blame] | 552 | xics_per_cpu[i] = ioremap(intnodes[hard_id].addr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 553 | intnodes[hard_id].size); |
| 554 | } |
| 555 | #else |
| 556 | xics_per_cpu[0] = ioremap(intr_base, intr_size); |
| 557 | #endif /* CONFIG_SMP */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 558 | } |
| 559 | |
Paul Mackerras | 8b1af56 | 2005-12-22 21:55:37 +1100 | [diff] [blame] | 560 | for (i = irq_offset_value(); i < NR_IRQS; ++i) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 561 | get_irq_desc(i)->handler = &xics_pic; |
| 562 | |
Paul Mackerras | 6c80a21 | 2005-05-06 16:28:56 +1000 | [diff] [blame] | 563 | xics_setup_cpu(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 564 | |
| 565 | ppc64_boot_msg(0x21, "XICS Done"); |
| 566 | } |
| 567 | |
| 568 | /* |
| 569 | * We cant do this in init_IRQ because we need the memory subsystem up for |
| 570 | * request_irq() |
| 571 | */ |
| 572 | static int __init xics_setup_i8259(void) |
| 573 | { |
| 574 | if (ppc64_interrupt_controller == IC_PPC_XIC && |
| 575 | xics_irq_8259_cascade != -1) { |
| 576 | if (request_irq(irq_offset_up(xics_irq_8259_cascade), |
| 577 | no_action, 0, "8259 cascade", NULL)) |
| 578 | printk(KERN_ERR "xics_setup_i8259: couldn't get 8259 " |
| 579 | "cascade\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 580 | } |
| 581 | return 0; |
| 582 | } |
| 583 | arch_initcall(xics_setup_i8259); |
| 584 | |
| 585 | #ifdef CONFIG_SMP |
| 586 | void xics_request_IPIs(void) |
| 587 | { |
| 588 | virt_irq_to_real_map[XICS_IPI] = XICS_IPI; |
| 589 | |
| 590 | /* IPIs are marked SA_INTERRUPT as they must run with irqs disabled */ |
| 591 | request_irq(irq_offset_up(XICS_IPI), xics_ipi_action, SA_INTERRUPT, |
| 592 | "IPI", NULL); |
| 593 | get_irq_desc(irq_offset_up(XICS_IPI))->status |= IRQ_PER_CPU; |
| 594 | } |
| 595 | #endif |
| 596 | |
| 597 | static void xics_set_affinity(unsigned int virq, cpumask_t cpumask) |
| 598 | { |
| 599 | unsigned int irq; |
| 600 | int status; |
| 601 | int xics_status[2]; |
| 602 | unsigned long newmask; |
| 603 | cpumask_t tmp = CPU_MASK_NONE; |
| 604 | |
| 605 | irq = virt_irq_to_real(irq_offset_down(virq)); |
| 606 | if (irq == XICS_IPI || irq == NO_IRQ) |
| 607 | return; |
| 608 | |
| 609 | status = rtas_call(ibm_get_xive, 1, 3, xics_status, irq); |
| 610 | |
| 611 | if (status) { |
Anton Blanchard | 2637032 | 2005-09-12 13:12:11 +1000 | [diff] [blame] | 612 | printk(KERN_ERR "xics_set_affinity: irq=%u ibm,get-xive " |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 613 | "returns %d\n", irq, status); |
| 614 | return; |
| 615 | } |
| 616 | |
| 617 | /* For the moment only implement delivery to all cpus or one cpu */ |
| 618 | if (cpus_equal(cpumask, CPU_MASK_ALL)) { |
| 619 | newmask = default_distrib_server; |
| 620 | } else { |
| 621 | cpus_and(tmp, cpu_online_map, cpumask); |
| 622 | if (cpus_empty(tmp)) |
| 623 | return; |
| 624 | newmask = get_hard_smp_processor_id(first_cpu(tmp)); |
| 625 | } |
| 626 | |
| 627 | status = rtas_call(ibm_set_xive, 3, 1, NULL, |
| 628 | irq, newmask, xics_status[1]); |
| 629 | |
| 630 | if (status) { |
Anton Blanchard | 2637032 | 2005-09-12 13:12:11 +1000 | [diff] [blame] | 631 | printk(KERN_ERR "xics_set_affinity: irq=%u ibm,set-xive " |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 632 | "returns %d\n", irq, status); |
| 633 | return; |
| 634 | } |
| 635 | } |
| 636 | |
Paul Mackerras | 6d22d85 | 2005-08-04 12:53:37 -0700 | [diff] [blame] | 637 | void xics_teardown_cpu(int secondary) |
R Sharada | fce0d57 | 2005-06-25 14:58:10 -0700 | [diff] [blame] | 638 | { |
| 639 | int cpu = smp_processor_id(); |
R Sharada | fce0d57 | 2005-06-25 14:58:10 -0700 | [diff] [blame] | 640 | |
| 641 | ops->cppr_info(cpu, 0x00); |
| 642 | iosync(); |
| 643 | |
| 644 | /* |
Paul Mackerras | 6d22d85 | 2005-08-04 12:53:37 -0700 | [diff] [blame] | 645 | * Some machines need to have at least one cpu in the GIQ, |
| 646 | * so leave the master cpu in the group. |
R Sharada | fce0d57 | 2005-06-25 14:58:10 -0700 | [diff] [blame] | 647 | */ |
Paul Mackerras | 6d22d85 | 2005-08-04 12:53:37 -0700 | [diff] [blame] | 648 | if (secondary) { |
| 649 | /* |
| 650 | * we need to EOI the IPI if we got here from kexec down IPI |
| 651 | * |
| 652 | * probably need to check all the other interrupts too |
| 653 | * should we be flagging idle loop instead? |
| 654 | * or creating some task to be scheduled? |
| 655 | */ |
| 656 | ops->xirr_info_set(cpu, XICS_IPI); |
| 657 | rtas_set_indicator(GLOBAL_INTERRUPT_QUEUE, |
| 658 | (1UL << interrupt_server_size) - 1 - |
| 659 | default_distrib_server, 0); |
| 660 | } |
R Sharada | fce0d57 | 2005-06-25 14:58:10 -0700 | [diff] [blame] | 661 | } |
| 662 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 663 | #ifdef CONFIG_HOTPLUG_CPU |
| 664 | |
| 665 | /* Interrupts are disabled. */ |
| 666 | void xics_migrate_irqs_away(void) |
| 667 | { |
| 668 | int status; |
| 669 | unsigned int irq, virq, cpu = smp_processor_id(); |
| 670 | |
| 671 | /* Reject any interrupt that was queued to us... */ |
| 672 | ops->cppr_info(cpu, 0); |
| 673 | iosync(); |
| 674 | |
| 675 | /* remove ourselves from the global interrupt queue */ |
| 676 | status = rtas_set_indicator(GLOBAL_INTERRUPT_QUEUE, |
| 677 | (1UL << interrupt_server_size) - 1 - default_distrib_server, 0); |
| 678 | WARN_ON(status < 0); |
| 679 | |
| 680 | /* Allow IPIs again... */ |
| 681 | ops->cppr_info(cpu, DEFAULT_PRIORITY); |
| 682 | iosync(); |
| 683 | |
| 684 | for_each_irq(virq) { |
| 685 | irq_desc_t *desc; |
| 686 | int xics_status[2]; |
| 687 | unsigned long flags; |
| 688 | |
| 689 | /* We cant set affinity on ISA interrupts */ |
| 690 | if (virq < irq_offset_value()) |
| 691 | continue; |
| 692 | |
| 693 | desc = get_irq_desc(virq); |
| 694 | irq = virt_irq_to_real(irq_offset_down(virq)); |
| 695 | |
| 696 | /* We need to get IPIs still. */ |
| 697 | if (irq == XICS_IPI || irq == NO_IRQ) |
| 698 | continue; |
| 699 | |
| 700 | /* We only need to migrate enabled IRQS */ |
| 701 | if (desc == NULL || desc->handler == NULL |
| 702 | || desc->action == NULL |
| 703 | || desc->handler->set_affinity == NULL) |
| 704 | continue; |
| 705 | |
| 706 | spin_lock_irqsave(&desc->lock, flags); |
| 707 | |
| 708 | status = rtas_call(ibm_get_xive, 1, 3, xics_status, irq); |
| 709 | if (status) { |
Anton Blanchard | 2637032 | 2005-09-12 13:12:11 +1000 | [diff] [blame] | 710 | printk(KERN_ERR "migrate_irqs_away: irq=%u " |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 711 | "ibm,get-xive returns %d\n", |
| 712 | virq, status); |
| 713 | goto unlock; |
| 714 | } |
| 715 | |
| 716 | /* |
| 717 | * We only support delivery to all cpus or to one cpu. |
| 718 | * The irq has to be migrated only in the single cpu |
| 719 | * case. |
| 720 | */ |
| 721 | if (xics_status[0] != get_hard_smp_processor_id(cpu)) |
| 722 | goto unlock; |
| 723 | |
Anton Blanchard | 2637032 | 2005-09-12 13:12:11 +1000 | [diff] [blame] | 724 | printk(KERN_WARNING "IRQ %u affinity broken off cpu %u\n", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 725 | virq, cpu); |
| 726 | |
| 727 | /* Reset affinity to all cpus */ |
| 728 | desc->handler->set_affinity(virq, CPU_MASK_ALL); |
| 729 | irq_affinity[virq] = CPU_MASK_ALL; |
| 730 | unlock: |
| 731 | spin_unlock_irqrestore(&desc->lock, flags); |
| 732 | } |
| 733 | } |
| 734 | #endif |