1 /* 2 * SPU file system -- SPU context management 3 * 4 * (C) Copyright IBM Deutschland Entwicklung GmbH 2005 5 * 6 * Author: Arnd Bergmann <arndb@de.ibm.com> 7 * 8 * This program is free software; you can redistribute it and/or modify 9 * it under the terms of the GNU General Public License as published by 10 * the Free Software Foundation; either version 2, or (at your option) 11 * any later version. 12 * 13 * This program is distributed in the hope that it will be useful, 14 * but WITHOUT ANY WARRANTY; without even the implied warranty of 15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 16 * GNU General Public License for more details. 17 * 18 * You should have received a copy of the GNU General Public License 19 * along with this program; if not, write to the Free Software 20 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. 21 */ 22 23 #include <linux/fs.h> 24 #include <linux/mm.h> 25 #include <linux/slab.h> 26 #include <linux/atomic.h> 27 #include <linux/sched.h> 28 #include <asm/spu.h> 29 #include <asm/spu_csa.h> 30 #include "spufs.h" 31 #include "sputrace.h" 32 33 34 atomic_t nr_spu_contexts = ATOMIC_INIT(0); 35 36 struct spu_context *alloc_spu_context(struct spu_gang *gang) 37 { 38 struct spu_context *ctx; 39 40 ctx = kzalloc(sizeof *ctx, GFP_KERNEL); 41 if (!ctx) 42 goto out; 43 /* Binding to physical processor deferred 44 * until spu_activate(). 45 */ 46 if (spu_init_csa(&ctx->csa)) 47 goto out_free; 48 spin_lock_init(&ctx->mmio_lock); 49 mutex_init(&ctx->mapping_lock); 50 kref_init(&ctx->kref); 51 mutex_init(&ctx->state_mutex); 52 mutex_init(&ctx->run_mutex); 53 init_waitqueue_head(&ctx->ibox_wq); 54 init_waitqueue_head(&ctx->wbox_wq); 55 init_waitqueue_head(&ctx->stop_wq); 56 init_waitqueue_head(&ctx->mfc_wq); 57 init_waitqueue_head(&ctx->run_wq); 58 ctx->state = SPU_STATE_SAVED; 59 ctx->ops = &spu_backing_ops; 60 ctx->owner = get_task_mm(current); 61 INIT_LIST_HEAD(&ctx->rq); 62 INIT_LIST_HEAD(&ctx->aff_list); 63 if (gang) 64 spu_gang_add_ctx(gang, ctx); 65 66 __spu_update_sched_info(ctx); 67 spu_set_timeslice(ctx); 68 ctx->stats.util_state = SPU_UTIL_IDLE_LOADED; 69 ctx->stats.tstamp = ktime_get_ns(); 70 71 atomic_inc(&nr_spu_contexts); 72 goto out; 73 out_free: 74 kfree(ctx); 75 ctx = NULL; 76 out: 77 return ctx; 78 } 79 80 void destroy_spu_context(struct kref *kref) 81 { 82 struct spu_context *ctx; 83 ctx = container_of(kref, struct spu_context, kref); 84 spu_context_nospu_trace(destroy_spu_context__enter, ctx); 85 mutex_lock(&ctx->state_mutex); 86 spu_deactivate(ctx); 87 mutex_unlock(&ctx->state_mutex); 88 spu_fini_csa(&ctx->csa); 89 if (ctx->gang) 90 spu_gang_remove_ctx(ctx->gang, ctx); 91 if (ctx->prof_priv_kref) 92 kref_put(ctx->prof_priv_kref, ctx->prof_priv_release); 93 BUG_ON(!list_empty(&ctx->rq)); 94 atomic_dec(&nr_spu_contexts); 95 kfree(ctx->switch_log); 96 kfree(ctx); 97 } 98 99 struct spu_context * get_spu_context(struct spu_context *ctx) 100 { 101 kref_get(&ctx->kref); 102 return ctx; 103 } 104 105 int put_spu_context(struct spu_context *ctx) 106 { 107 return kref_put(&ctx->kref, &destroy_spu_context); 108 } 109 110 /* give up the mm reference when the context is about to be destroyed */ 111 void spu_forget(struct spu_context *ctx) 112 { 113 struct mm_struct *mm; 114 115 /* 116 * This is basically an open-coded spu_acquire_saved, except that 117 * we don't acquire the state mutex interruptible, and we don't 118 * want this context to be rescheduled on release. 119 */ 120 mutex_lock(&ctx->state_mutex); 121 if (ctx->state != SPU_STATE_SAVED) 122 spu_deactivate(ctx); 123 124 mm = ctx->owner; 125 ctx->owner = NULL; 126 mmput(mm); 127 spu_release(ctx); 128 } 129 130 void spu_unmap_mappings(struct spu_context *ctx) 131 { 132 mutex_lock(&ctx->mapping_lock); 133 if (ctx->local_store) 134 unmap_mapping_range(ctx->local_store, 0, LS_SIZE, 1); 135 if (ctx->mfc) 136 unmap_mapping_range(ctx->mfc, 0, SPUFS_MFC_MAP_SIZE, 1); 137 if (ctx->cntl) 138 unmap_mapping_range(ctx->cntl, 0, SPUFS_CNTL_MAP_SIZE, 1); 139 if (ctx->signal1) 140 unmap_mapping_range(ctx->signal1, 0, SPUFS_SIGNAL_MAP_SIZE, 1); 141 if (ctx->signal2) 142 unmap_mapping_range(ctx->signal2, 0, SPUFS_SIGNAL_MAP_SIZE, 1); 143 if (ctx->mss) 144 unmap_mapping_range(ctx->mss, 0, SPUFS_MSS_MAP_SIZE, 1); 145 if (ctx->psmap) 146 unmap_mapping_range(ctx->psmap, 0, SPUFS_PS_MAP_SIZE, 1); 147 mutex_unlock(&ctx->mapping_lock); 148 } 149 150 /** 151 * spu_acquire_saved - lock spu contex and make sure it is in saved state 152 * @ctx: spu contex to lock 153 */ 154 int spu_acquire_saved(struct spu_context *ctx) 155 { 156 int ret; 157 158 spu_context_nospu_trace(spu_acquire_saved__enter, ctx); 159 160 ret = spu_acquire(ctx); 161 if (ret) 162 return ret; 163 164 if (ctx->state != SPU_STATE_SAVED) { 165 set_bit(SPU_SCHED_WAS_ACTIVE, &ctx->sched_flags); 166 spu_deactivate(ctx); 167 } 168 169 return 0; 170 } 171 172 /** 173 * spu_release_saved - unlock spu context and return it to the runqueue 174 * @ctx: context to unlock 175 */ 176 void spu_release_saved(struct spu_context *ctx) 177 { 178 BUG_ON(ctx->state != SPU_STATE_SAVED); 179 180 if (test_and_clear_bit(SPU_SCHED_WAS_ACTIVE, &ctx->sched_flags) && 181 test_bit(SPU_SCHED_SPU_RUN, &ctx->sched_flags)) 182 spu_activate(ctx, 0); 183 184 spu_release(ctx); 185 } 186 187