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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 | // SPDX-License-Identifier: GPL-2.0-or-later /* * SPU file system -- SPU context management * * (C) Copyright IBM Deutschland Entwicklung GmbH 2005 * * Author: Arnd Bergmann <arndb@de.ibm.com> */ #include <linux/fs.h> #include <linux/mm.h> #include <linux/slab.h> #include <linux/atomic.h> #include <linux/sched.h> #include <linux/sched/mm.h> #include <asm/spu.h> #include <asm/spu_csa.h> #include "spufs.h" #include "sputrace.h" atomic_t nr_spu_contexts = ATOMIC_INIT(0); struct spu_context *alloc_spu_context(struct spu_gang *gang) { struct spu_context *ctx; ctx = kzalloc(sizeof *ctx, GFP_KERNEL); if (!ctx) goto out; /* Binding to physical processor deferred * until spu_activate(). */ if (spu_init_csa(&ctx->csa)) goto out_free; spin_lock_init(&ctx->mmio_lock); mutex_init(&ctx->mapping_lock); kref_init(&ctx->kref); mutex_init(&ctx->state_mutex); mutex_init(&ctx->run_mutex); init_waitqueue_head(&ctx->ibox_wq); init_waitqueue_head(&ctx->wbox_wq); init_waitqueue_head(&ctx->stop_wq); init_waitqueue_head(&ctx->mfc_wq); init_waitqueue_head(&ctx->run_wq); ctx->state = SPU_STATE_SAVED; ctx->ops = &spu_backing_ops; ctx->owner = get_task_mm(current); INIT_LIST_HEAD(&ctx->rq); INIT_LIST_HEAD(&ctx->aff_list); if (gang) spu_gang_add_ctx(gang, ctx); __spu_update_sched_info(ctx); spu_set_timeslice(ctx); ctx->stats.util_state = SPU_UTIL_IDLE_LOADED; ctx->stats.tstamp = ktime_get_ns(); atomic_inc(&nr_spu_contexts); goto out; out_free: kfree(ctx); ctx = NULL; out: return ctx; } void destroy_spu_context(struct kref *kref) { struct spu_context *ctx; ctx = container_of(kref, struct spu_context, kref); spu_context_nospu_trace(destroy_spu_context__enter, ctx); mutex_lock(&ctx->state_mutex); spu_deactivate(ctx); mutex_unlock(&ctx->state_mutex); spu_fini_csa(&ctx->csa); if (ctx->gang) spu_gang_remove_ctx(ctx->gang, ctx); if (ctx->prof_priv_kref) kref_put(ctx->prof_priv_kref, ctx->prof_priv_release); BUG_ON(!list_empty(&ctx->rq)); atomic_dec(&nr_spu_contexts); kfree(ctx->switch_log); kfree(ctx); } struct spu_context * get_spu_context(struct spu_context *ctx) { kref_get(&ctx->kref); return ctx; } int put_spu_context(struct spu_context *ctx) { return kref_put(&ctx->kref, &destroy_spu_context); } /* give up the mm reference when the context is about to be destroyed */ void spu_forget(struct spu_context *ctx) { struct mm_struct *mm; /* * This is basically an open-coded spu_acquire_saved, except that * we don't acquire the state mutex interruptible, and we don't * want this context to be rescheduled on release. */ mutex_lock(&ctx->state_mutex); if (ctx->state != SPU_STATE_SAVED) spu_deactivate(ctx); mm = ctx->owner; ctx->owner = NULL; mmput(mm); spu_release(ctx); } void spu_unmap_mappings(struct spu_context *ctx) { mutex_lock(&ctx->mapping_lock); if (ctx->local_store) unmap_mapping_range(ctx->local_store, 0, LS_SIZE, 1); if (ctx->mfc) unmap_mapping_range(ctx->mfc, 0, SPUFS_MFC_MAP_SIZE, 1); if (ctx->cntl) unmap_mapping_range(ctx->cntl, 0, SPUFS_CNTL_MAP_SIZE, 1); if (ctx->signal1) unmap_mapping_range(ctx->signal1, 0, SPUFS_SIGNAL_MAP_SIZE, 1); if (ctx->signal2) unmap_mapping_range(ctx->signal2, 0, SPUFS_SIGNAL_MAP_SIZE, 1); if (ctx->mss) unmap_mapping_range(ctx->mss, 0, SPUFS_MSS_MAP_SIZE, 1); if (ctx->psmap) unmap_mapping_range(ctx->psmap, 0, SPUFS_PS_MAP_SIZE, 1); mutex_unlock(&ctx->mapping_lock); } /** * spu_acquire_saved - lock spu contex and make sure it is in saved state * @ctx: spu contex to lock */ int spu_acquire_saved(struct spu_context *ctx) { int ret; spu_context_nospu_trace(spu_acquire_saved__enter, ctx); ret = spu_acquire(ctx); if (ret) return ret; if (ctx->state != SPU_STATE_SAVED) { set_bit(SPU_SCHED_WAS_ACTIVE, &ctx->sched_flags); spu_deactivate(ctx); } return 0; } /** * spu_release_saved - unlock spu context and return it to the runqueue * @ctx: context to unlock */ void spu_release_saved(struct spu_context *ctx) { BUG_ON(ctx->state != SPU_STATE_SAVED); if (test_and_clear_bit(SPU_SCHED_WAS_ACTIVE, &ctx->sched_flags) && test_bit(SPU_SCHED_SPU_RUN, &ctx->sched_flags)) spu_activate(ctx, 0); spu_release(ctx); } |