Arnd Bergmann | 67207b9 | 2005-11-15 15:53:48 -0500 | [diff] [blame] | 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 | |
Arnd Bergmann | 8b3d666 | 2005-11-15 15:53:52 -0500 | [diff] [blame] | 23 | #include <linux/fs.h> |
| 24 | #include <linux/mm.h> |
Arnd Bergmann | 67207b9 | 2005-11-15 15:53:48 -0500 | [diff] [blame] | 25 | #include <linux/slab.h> |
| 26 | #include <asm/spu.h> |
Mark Nutter | 5473af0 | 2005-11-15 15:53:49 -0500 | [diff] [blame] | 27 | #include <asm/spu_csa.h> |
Arnd Bergmann | 67207b9 | 2005-11-15 15:53:48 -0500 | [diff] [blame] | 28 | #include "spufs.h" |
| 29 | |
Arnd Bergmann | 8b3d666 | 2005-11-15 15:53:52 -0500 | [diff] [blame] | 30 | struct spu_context *alloc_spu_context(struct address_space *local_store) |
Arnd Bergmann | 67207b9 | 2005-11-15 15:53:48 -0500 | [diff] [blame] | 31 | { |
| 32 | struct spu_context *ctx; |
| 33 | ctx = kmalloc(sizeof *ctx, GFP_KERNEL); |
| 34 | if (!ctx) |
| 35 | goto out; |
Arnd Bergmann | 8b3d666 | 2005-11-15 15:53:52 -0500 | [diff] [blame] | 36 | /* Binding to physical processor deferred |
| 37 | * until spu_activate(). |
Mark Nutter | 5473af0 | 2005-11-15 15:53:49 -0500 | [diff] [blame] | 38 | */ |
Mark Nutter | 5473af0 | 2005-11-15 15:53:49 -0500 | [diff] [blame] | 39 | spu_init_csa(&ctx->csa); |
| 40 | if (!ctx->csa.lscsa) { |
Mark Nutter | 5473af0 | 2005-11-15 15:53:49 -0500 | [diff] [blame] | 41 | goto out_free; |
| 42 | } |
Arnd Bergmann | 67207b9 | 2005-11-15 15:53:48 -0500 | [diff] [blame] | 43 | spin_lock_init(&ctx->mmio_lock); |
| 44 | kref_init(&ctx->kref); |
Arnd Bergmann | 8b3d666 | 2005-11-15 15:53:52 -0500 | [diff] [blame] | 45 | init_rwsem(&ctx->state_sema); |
Arnd Bergmann | 5ef8224 | 2006-01-04 20:31:24 +0100 | [diff] [blame^] | 46 | init_MUTEX(&ctx->run_sema); |
Arnd Bergmann | 8b3d666 | 2005-11-15 15:53:52 -0500 | [diff] [blame] | 47 | init_waitqueue_head(&ctx->ibox_wq); |
| 48 | init_waitqueue_head(&ctx->wbox_wq); |
Arnd Bergmann | 5110459 | 2005-12-05 22:52:25 -0500 | [diff] [blame] | 49 | init_waitqueue_head(&ctx->stop_wq); |
Arnd Bergmann | 8b3d666 | 2005-11-15 15:53:52 -0500 | [diff] [blame] | 50 | ctx->ibox_fasync = NULL; |
| 51 | ctx->wbox_fasync = NULL; |
| 52 | ctx->state = SPU_STATE_SAVED; |
| 53 | ctx->local_store = local_store; |
| 54 | ctx->spu = NULL; |
| 55 | ctx->ops = &spu_backing_ops; |
| 56 | ctx->owner = get_task_mm(current); |
Arnd Bergmann | 67207b9 | 2005-11-15 15:53:48 -0500 | [diff] [blame] | 57 | goto out; |
| 58 | out_free: |
| 59 | kfree(ctx); |
| 60 | ctx = NULL; |
| 61 | out: |
| 62 | return ctx; |
| 63 | } |
| 64 | |
| 65 | void destroy_spu_context(struct kref *kref) |
| 66 | { |
| 67 | struct spu_context *ctx; |
| 68 | ctx = container_of(kref, struct spu_context, kref); |
Arnd Bergmann | 8b3d666 | 2005-11-15 15:53:52 -0500 | [diff] [blame] | 69 | down_write(&ctx->state_sema); |
| 70 | spu_deactivate(ctx); |
| 71 | ctx->ibox_fasync = NULL; |
| 72 | ctx->wbox_fasync = NULL; |
| 73 | up_write(&ctx->state_sema); |
Mark Nutter | 5473af0 | 2005-11-15 15:53:49 -0500 | [diff] [blame] | 74 | spu_fini_csa(&ctx->csa); |
Arnd Bergmann | 67207b9 | 2005-11-15 15:53:48 -0500 | [diff] [blame] | 75 | kfree(ctx); |
| 76 | } |
| 77 | |
| 78 | struct spu_context * get_spu_context(struct spu_context *ctx) |
| 79 | { |
| 80 | kref_get(&ctx->kref); |
| 81 | return ctx; |
| 82 | } |
| 83 | |
| 84 | int put_spu_context(struct spu_context *ctx) |
| 85 | { |
| 86 | return kref_put(&ctx->kref, &destroy_spu_context); |
| 87 | } |
| 88 | |
Arnd Bergmann | 8b3d666 | 2005-11-15 15:53:52 -0500 | [diff] [blame] | 89 | /* give up the mm reference when the context is about to be destroyed */ |
| 90 | void spu_forget(struct spu_context *ctx) |
| 91 | { |
| 92 | struct mm_struct *mm; |
| 93 | spu_acquire_saved(ctx); |
| 94 | mm = ctx->owner; |
| 95 | ctx->owner = NULL; |
| 96 | mmput(mm); |
| 97 | spu_release(ctx); |
| 98 | } |
Arnd Bergmann | 67207b9 | 2005-11-15 15:53:48 -0500 | [diff] [blame] | 99 | |
Arnd Bergmann | 8b3d666 | 2005-11-15 15:53:52 -0500 | [diff] [blame] | 100 | void spu_acquire(struct spu_context *ctx) |
| 101 | { |
| 102 | down_read(&ctx->state_sema); |
| 103 | } |
| 104 | |
| 105 | void spu_release(struct spu_context *ctx) |
| 106 | { |
| 107 | up_read(&ctx->state_sema); |
| 108 | } |
| 109 | |
Arnd Bergmann | 5110459 | 2005-12-05 22:52:25 -0500 | [diff] [blame] | 110 | void spu_unmap_mappings(struct spu_context *ctx) |
Arnd Bergmann | 8b3d666 | 2005-11-15 15:53:52 -0500 | [diff] [blame] | 111 | { |
| 112 | unmap_mapping_range(ctx->local_store, 0, LS_SIZE, 1); |
| 113 | } |
| 114 | |
| 115 | int spu_acquire_runnable(struct spu_context *ctx) |
| 116 | { |
| 117 | int ret = 0; |
| 118 | |
| 119 | down_read(&ctx->state_sema); |
Arnd Bergmann | 2a911f0 | 2005-12-05 22:52:26 -0500 | [diff] [blame] | 120 | if (ctx->state == SPU_STATE_RUNNABLE) { |
| 121 | ctx->spu->prio = current->prio; |
Arnd Bergmann | 8b3d666 | 2005-11-15 15:53:52 -0500 | [diff] [blame] | 122 | return 0; |
Arnd Bergmann | 2a911f0 | 2005-12-05 22:52:26 -0500 | [diff] [blame] | 123 | } |
Arnd Bergmann | 762cf6d | 2006-01-04 20:31:21 +0100 | [diff] [blame] | 124 | up_read(&ctx->state_sema); |
| 125 | |
| 126 | down_write(&ctx->state_sema); |
Arnd Bergmann | 8b3d666 | 2005-11-15 15:53:52 -0500 | [diff] [blame] | 127 | /* ctx is about to be freed, can't acquire any more */ |
| 128 | if (!ctx->owner) { |
| 129 | ret = -EINVAL; |
| 130 | goto out; |
| 131 | } |
Arnd Bergmann | 8b3d666 | 2005-11-15 15:53:52 -0500 | [diff] [blame] | 132 | |
Arnd Bergmann | 8b3d666 | 2005-11-15 15:53:52 -0500 | [diff] [blame] | 133 | if (ctx->state == SPU_STATE_SAVED) { |
Arnd Bergmann | 8b3d666 | 2005-11-15 15:53:52 -0500 | [diff] [blame] | 134 | ret = spu_activate(ctx, 0); |
| 135 | ctx->state = SPU_STATE_RUNNABLE; |
| 136 | } |
Arnd Bergmann | 8b3d666 | 2005-11-15 15:53:52 -0500 | [diff] [blame] | 137 | if (ret) |
| 138 | goto out; |
| 139 | |
Arnd Bergmann | 762cf6d | 2006-01-04 20:31:21 +0100 | [diff] [blame] | 140 | downgrade_write(&ctx->state_sema); |
Arnd Bergmann | 8b3d666 | 2005-11-15 15:53:52 -0500 | [diff] [blame] | 141 | /* On success, we return holding the lock */ |
Arnd Bergmann | 762cf6d | 2006-01-04 20:31:21 +0100 | [diff] [blame] | 142 | |
Arnd Bergmann | 8b3d666 | 2005-11-15 15:53:52 -0500 | [diff] [blame] | 143 | return ret; |
| 144 | out: |
| 145 | /* Release here, to simplify calling code. */ |
Arnd Bergmann | 762cf6d | 2006-01-04 20:31:21 +0100 | [diff] [blame] | 146 | up_write(&ctx->state_sema); |
Arnd Bergmann | 8b3d666 | 2005-11-15 15:53:52 -0500 | [diff] [blame] | 147 | |
| 148 | return ret; |
| 149 | } |
| 150 | |
| 151 | void spu_acquire_saved(struct spu_context *ctx) |
| 152 | { |
| 153 | down_read(&ctx->state_sema); |
| 154 | |
| 155 | if (ctx->state == SPU_STATE_SAVED) |
| 156 | return; |
| 157 | |
| 158 | up_read(&ctx->state_sema); |
| 159 | down_write(&ctx->state_sema); |
| 160 | |
| 161 | if (ctx->state == SPU_STATE_RUNNABLE) { |
Arnd Bergmann | 8b3d666 | 2005-11-15 15:53:52 -0500 | [diff] [blame] | 162 | spu_deactivate(ctx); |
| 163 | ctx->state = SPU_STATE_SAVED; |
| 164 | } |
| 165 | |
| 166 | downgrade_write(&ctx->state_sema); |
| 167 | } |