1 /* backing_ops.c - query/set operations on saved SPU context. 2 * 3 * Copyright (C) IBM 2005 4 * Author: Mark Nutter <mnutter@us.ibm.com> 5 * 6 * These register operations allow SPUFS to operate on saved 7 * SPU contexts rather than hardware. 8 * 9 * This program is free software; you can redistribute it and/or modify 10 * it under the terms of the GNU General Public License as published by 11 * the Free Software Foundation; either version 2, or (at your option) 12 * any later version. 13 * 14 * This program is distributed in the hope that it will be useful, 15 * but WITHOUT ANY WARRANTY; without even the implied warranty of 16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 17 * GNU General Public License for more details. 18 * 19 * You should have received a copy of the GNU General Public License 20 * along with this program; if not, write to the Free Software 21 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 22 */ 23 24 #include <linux/module.h> 25 #include <linux/errno.h> 26 #include <linux/sched.h> 27 #include <linux/kernel.h> 28 #include <linux/mm.h> 29 #include <linux/vmalloc.h> 30 #include <linux/smp.h> 31 #include <linux/smp_lock.h> 32 #include <linux/stddef.h> 33 #include <linux/unistd.h> 34 #include <linux/poll.h> 35 36 #include <asm/io.h> 37 #include <asm/spu.h> 38 #include <asm/spu_csa.h> 39 #include <asm/mmu_context.h> 40 #include "spufs.h" 41 42 /* 43 * Reads/writes to various problem and priv2 registers require 44 * state changes, i.e. generate SPU events, modify channel 45 * counts, etc. 46 */ 47 48 static void gen_spu_event(struct spu_context *ctx, u32 event) 49 { 50 u64 ch0_cnt; 51 u64 ch0_data; 52 u64 ch1_data; 53 54 ch0_cnt = ctx->csa.spu_chnlcnt_RW[0]; 55 ch0_data = ctx->csa.spu_chnldata_RW[0]; 56 ch1_data = ctx->csa.spu_chnldata_RW[1]; 57 ctx->csa.spu_chnldata_RW[0] |= event; 58 if ((ch0_cnt == 0) && !(ch0_data & event) && (ch1_data & event)) { 59 ctx->csa.spu_chnlcnt_RW[0] = 1; 60 } 61 } 62 63 static int spu_backing_mbox_read(struct spu_context *ctx, u32 * data) 64 { 65 u32 mbox_stat; 66 int ret = 0; 67 68 spin_lock(&ctx->csa.register_lock); 69 mbox_stat = ctx->csa.prob.mb_stat_R; 70 if (mbox_stat & 0x0000ff) { 71 /* Read the first available word. 72 * Implementation note: the depth 73 * of pu_mb_R is currently 1. 74 */ 75 *data = ctx->csa.prob.pu_mb_R; 76 ctx->csa.prob.mb_stat_R &= ~(0x0000ff); 77 ctx->csa.spu_chnlcnt_RW[28] = 1; 78 gen_spu_event(ctx, MFC_PU_MAILBOX_AVAILABLE_EVENT); 79 ret = 4; 80 } 81 spin_unlock(&ctx->csa.register_lock); 82 return ret; 83 } 84 85 static u32 spu_backing_mbox_stat_read(struct spu_context *ctx) 86 { 87 return ctx->csa.prob.mb_stat_R; 88 } 89 90 static unsigned int spu_backing_mbox_stat_poll(struct spu_context *ctx, 91 unsigned int events) 92 { 93 int ret; 94 u32 stat; 95 96 ret = 0; 97 spin_lock_irq(&ctx->csa.register_lock); 98 stat = ctx->csa.prob.mb_stat_R; 99 100 /* if the requested event is there, return the poll 101 mask, otherwise enable the interrupt to get notified, 102 but first mark any pending interrupts as done so 103 we don't get woken up unnecessarily */ 104 105 if (events & (POLLIN | POLLRDNORM)) { 106 if (stat & 0xff0000) 107 ret |= POLLIN | POLLRDNORM; 108 else { 109 ctx->csa.priv1.int_stat_class0_RW &= ~0x1; 110 ctx->csa.priv1.int_mask_class2_RW |= 0x1; 111 } 112 } 113 if (events & (POLLOUT | POLLWRNORM)) { 114 if (stat & 0x00ff00) 115 ret = POLLOUT | POLLWRNORM; 116 else { 117 ctx->csa.priv1.int_stat_class0_RW &= ~0x10; 118 ctx->csa.priv1.int_mask_class2_RW |= 0x10; 119 } 120 } 121 spin_unlock_irq(&ctx->csa.register_lock); 122 return ret; 123 } 124 125 static int spu_backing_ibox_read(struct spu_context *ctx, u32 * data) 126 { 127 int ret; 128 129 spin_lock(&ctx->csa.register_lock); 130 if (ctx->csa.prob.mb_stat_R & 0xff0000) { 131 /* Read the first available word. 132 * Implementation note: the depth 133 * of puint_mb_R is currently 1. 134 */ 135 *data = ctx->csa.priv2.puint_mb_R; 136 ctx->csa.prob.mb_stat_R &= ~(0xff0000); 137 ctx->csa.spu_chnlcnt_RW[30] = 1; 138 gen_spu_event(ctx, MFC_PU_INT_MAILBOX_AVAILABLE_EVENT); 139 ret = 4; 140 } else { 141 /* make sure we get woken up by the interrupt */ 142 ctx->csa.priv1.int_mask_class2_RW |= 0x1UL; 143 ret = 0; 144 } 145 spin_unlock(&ctx->csa.register_lock); 146 return ret; 147 } 148 149 static int spu_backing_wbox_write(struct spu_context *ctx, u32 data) 150 { 151 int ret; 152 153 spin_lock(&ctx->csa.register_lock); 154 if ((ctx->csa.prob.mb_stat_R) & 0x00ff00) { 155 int slot = ctx->csa.spu_chnlcnt_RW[29]; 156 int avail = (ctx->csa.prob.mb_stat_R & 0x00ff00) >> 8; 157 158 /* We have space to write wbox_data. 159 * Implementation note: the depth 160 * of spu_mb_W is currently 4. 161 */ 162 BUG_ON(avail != (4 - slot)); 163 ctx->csa.spu_mailbox_data[slot] = data; 164 ctx->csa.spu_chnlcnt_RW[29] = ++slot; 165 ctx->csa.prob.mb_stat_R = (((4 - slot) & 0xff) << 8); 166 gen_spu_event(ctx, MFC_SPU_MAILBOX_WRITTEN_EVENT); 167 ret = 4; 168 } else { 169 /* make sure we get woken up by the interrupt when space 170 becomes available */ 171 ctx->csa.priv1.int_mask_class2_RW |= 0x10; 172 ret = 0; 173 } 174 spin_unlock(&ctx->csa.register_lock); 175 return ret; 176 } 177 178 static u32 spu_backing_signal1_read(struct spu_context *ctx) 179 { 180 return ctx->csa.spu_chnldata_RW[3]; 181 } 182 183 static void spu_backing_signal1_write(struct spu_context *ctx, u32 data) 184 { 185 spin_lock(&ctx->csa.register_lock); 186 if (ctx->csa.priv2.spu_cfg_RW & 0x1) 187 ctx->csa.spu_chnldata_RW[3] |= data; 188 else 189 ctx->csa.spu_chnldata_RW[3] = data; 190 ctx->csa.spu_chnlcnt_RW[3] = 1; 191 gen_spu_event(ctx, MFC_SIGNAL_1_EVENT); 192 spin_unlock(&ctx->csa.register_lock); 193 } 194 195 static u32 spu_backing_signal2_read(struct spu_context *ctx) 196 { 197 return ctx->csa.spu_chnldata_RW[4]; 198 } 199 200 static void spu_backing_signal2_write(struct spu_context *ctx, u32 data) 201 { 202 spin_lock(&ctx->csa.register_lock); 203 if (ctx->csa.priv2.spu_cfg_RW & 0x2) 204 ctx->csa.spu_chnldata_RW[4] |= data; 205 else 206 ctx->csa.spu_chnldata_RW[4] = data; 207 ctx->csa.spu_chnlcnt_RW[4] = 1; 208 gen_spu_event(ctx, MFC_SIGNAL_2_EVENT); 209 spin_unlock(&ctx->csa.register_lock); 210 } 211 212 static void spu_backing_signal1_type_set(struct spu_context *ctx, u64 val) 213 { 214 u64 tmp; 215 216 spin_lock(&ctx->csa.register_lock); 217 tmp = ctx->csa.priv2.spu_cfg_RW; 218 if (val) 219 tmp |= 1; 220 else 221 tmp &= ~1; 222 ctx->csa.priv2.spu_cfg_RW = tmp; 223 spin_unlock(&ctx->csa.register_lock); 224 } 225 226 static u64 spu_backing_signal1_type_get(struct spu_context *ctx) 227 { 228 return ((ctx->csa.priv2.spu_cfg_RW & 1) != 0); 229 } 230 231 static void spu_backing_signal2_type_set(struct spu_context *ctx, u64 val) 232 { 233 u64 tmp; 234 235 spin_lock(&ctx->csa.register_lock); 236 tmp = ctx->csa.priv2.spu_cfg_RW; 237 if (val) 238 tmp |= 2; 239 else 240 tmp &= ~2; 241 ctx->csa.priv2.spu_cfg_RW = tmp; 242 spin_unlock(&ctx->csa.register_lock); 243 } 244 245 static u64 spu_backing_signal2_type_get(struct spu_context *ctx) 246 { 247 return ((ctx->csa.priv2.spu_cfg_RW & 2) != 0); 248 } 249 250 static u32 spu_backing_npc_read(struct spu_context *ctx) 251 { 252 return ctx->csa.prob.spu_npc_RW; 253 } 254 255 static void spu_backing_npc_write(struct spu_context *ctx, u32 val) 256 { 257 ctx->csa.prob.spu_npc_RW = val; 258 } 259 260 static u32 spu_backing_status_read(struct spu_context *ctx) 261 { 262 return ctx->csa.prob.spu_status_R; 263 } 264 265 static char *spu_backing_get_ls(struct spu_context *ctx) 266 { 267 return ctx->csa.lscsa->ls; 268 } 269 270 static void spu_backing_runcntl_write(struct spu_context *ctx, u32 val) 271 { 272 spin_lock(&ctx->csa.register_lock); 273 ctx->csa.prob.spu_runcntl_RW = val; 274 if (val & SPU_RUNCNTL_RUNNABLE) { 275 ctx->csa.prob.spu_status_R |= SPU_STATUS_RUNNING; 276 } else { 277 ctx->csa.prob.spu_status_R &= ~SPU_STATUS_RUNNING; 278 } 279 spin_unlock(&ctx->csa.register_lock); 280 } 281 282 static void spu_backing_runcntl_stop(struct spu_context *ctx) 283 { 284 spu_backing_runcntl_write(ctx, SPU_RUNCNTL_STOP); 285 } 286 287 static int spu_backing_set_mfc_query(struct spu_context * ctx, u32 mask, 288 u32 mode) 289 { 290 struct spu_problem_collapsed *prob = &ctx->csa.prob; 291 int ret; 292 293 spin_lock(&ctx->csa.register_lock); 294 ret = -EAGAIN; 295 if (prob->dma_querytype_RW) 296 goto out; 297 ret = 0; 298 /* FIXME: what are the side-effects of this? */ 299 prob->dma_querymask_RW = mask; 300 prob->dma_querytype_RW = mode; 301 out: 302 spin_unlock(&ctx->csa.register_lock); 303 304 return ret; 305 } 306 307 static u32 spu_backing_read_mfc_tagstatus(struct spu_context * ctx) 308 { 309 return ctx->csa.prob.dma_tagstatus_R; 310 } 311 312 static u32 spu_backing_get_mfc_free_elements(struct spu_context *ctx) 313 { 314 return ctx->csa.prob.dma_qstatus_R; 315 } 316 317 static int spu_backing_send_mfc_command(struct spu_context *ctx, 318 struct mfc_dma_command *cmd) 319 { 320 int ret; 321 322 spin_lock(&ctx->csa.register_lock); 323 ret = -EAGAIN; 324 /* FIXME: set up priv2->puq */ 325 spin_unlock(&ctx->csa.register_lock); 326 327 return ret; 328 } 329 330 struct spu_context_ops spu_backing_ops = { 331 .mbox_read = spu_backing_mbox_read, 332 .mbox_stat_read = spu_backing_mbox_stat_read, 333 .mbox_stat_poll = spu_backing_mbox_stat_poll, 334 .ibox_read = spu_backing_ibox_read, 335 .wbox_write = spu_backing_wbox_write, 336 .signal1_read = spu_backing_signal1_read, 337 .signal1_write = spu_backing_signal1_write, 338 .signal2_read = spu_backing_signal2_read, 339 .signal2_write = spu_backing_signal2_write, 340 .signal1_type_set = spu_backing_signal1_type_set, 341 .signal1_type_get = spu_backing_signal1_type_get, 342 .signal2_type_set = spu_backing_signal2_type_set, 343 .signal2_type_get = spu_backing_signal2_type_get, 344 .npc_read = spu_backing_npc_read, 345 .npc_write = spu_backing_npc_write, 346 .status_read = spu_backing_status_read, 347 .get_ls = spu_backing_get_ls, 348 .runcntl_write = spu_backing_runcntl_write, 349 .runcntl_stop = spu_backing_runcntl_stop, 350 .set_mfc_query = spu_backing_set_mfc_query, 351 .read_mfc_tagstatus = spu_backing_read_mfc_tagstatus, 352 .get_mfc_free_elements = spu_backing_get_mfc_free_elements, 353 .send_mfc_command = spu_backing_send_mfc_command, 354 }; 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