[POWERPC] spufs: add support for nonschedulable contexts
This adds two new flags to spu_create: SPU_CREATE_NONSCHED: create a context that is never moved away from an SPE once it has started running. This flag can only be used by tasks with the CAP_SYS_NICE capability. SPU_CREATE_ISOLATED: create a nonschedulable context that enters isolation mode upon first run. This requires the SPU_CREATE_NONSCHED flag. Signed-off-by: Jeremy Kerr <jk@ozlabs.org> Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Mark Nutter
Paul Mackerras
parent
cc21a66d7f
commit
5737edd1dd
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@ -1531,3 +1531,25 @@ struct tree_descr spufs_dir_contents[] = {
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{ "object-id", &spufs_object_id_ops, 0666, },
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{},
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};
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struct tree_descr spufs_dir_nosched_contents[] = {
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{ "mem", &spufs_mem_fops, 0666, },
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{ "mbox", &spufs_mbox_fops, 0444, },
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{ "ibox", &spufs_ibox_fops, 0444, },
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{ "wbox", &spufs_wbox_fops, 0222, },
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{ "mbox_stat", &spufs_mbox_stat_fops, 0444, },
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{ "ibox_stat", &spufs_ibox_stat_fops, 0444, },
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{ "wbox_stat", &spufs_wbox_stat_fops, 0444, },
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{ "signal1", &spufs_signal1_fops, 0666, },
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{ "signal2", &spufs_signal2_fops, 0666, },
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{ "signal1_type", &spufs_signal1_type, 0666, },
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{ "signal2_type", &spufs_signal2_type, 0666, },
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{ "mss", &spufs_mss_fops, 0666, },
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{ "mfc", &spufs_mfc_fops, 0666, },
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{ "cntl", &spufs_cntl_fops, 0666, },
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{ "npc", &spufs_npc_ops, 0666, },
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{ "psmap", &spufs_psmap_fops, 0666, },
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{ "phys-id", &spufs_id_ops, 0666, },
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{ "object-id", &spufs_object_id_ops, 0666, },
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{},
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};
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@ -219,8 +219,11 @@ static char *spu_hw_get_ls(struct spu_context *ctx)
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static void spu_hw_runcntl_write(struct spu_context *ctx, u32 val)
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{
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eieio();
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spin_lock_irq(&ctx->spu->register_lock);
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if (val & SPU_RUNCNTL_ISOLATE)
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out_be64(&ctx->spu->priv2->spu_privcntl_RW, 4LL);
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out_be32(&ctx->spu->problem->spu_runcntl_RW, val);
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spin_unlock_irq(&ctx->spu->register_lock);
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}
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static void spu_hw_runcntl_stop(struct spu_context *ctx)
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@ -258,7 +258,12 @@ spufs_mkdir(struct inode *dir, struct dentry *dentry, unsigned int flags,
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inode->i_op = &spufs_dir_inode_operations;
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inode->i_fop = &simple_dir_operations;
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ret = spufs_fill_dir(dentry, spufs_dir_contents, mode, ctx);
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if (flags & SPU_CREATE_NOSCHED)
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ret = spufs_fill_dir(dentry, spufs_dir_nosched_contents,
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mode, ctx);
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else
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ret = spufs_fill_dir(dentry, spufs_dir_contents, mode, ctx);
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if (ret)
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goto out_free_ctx;
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@ -307,6 +312,16 @@ static int spufs_create_context(struct inode *inode,
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{
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int ret;
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ret = -EPERM;
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if ((flags & SPU_CREATE_NOSCHED) &&
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!capable(CAP_SYS_NICE))
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goto out_unlock;
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ret = -EINVAL;
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if ((flags & (SPU_CREATE_NOSCHED | SPU_CREATE_ISOLATE))
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== SPU_CREATE_ISOLATE)
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goto out_unlock;
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ret = spufs_mkdir(inode, dentry, flags, mode & S_IRWXUGO);
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if (ret)
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goto out_unlock;
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@ -51,11 +51,17 @@ static inline int spu_stopped(struct spu_context *ctx, u32 * stat)
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static inline int spu_run_init(struct spu_context *ctx, u32 * npc)
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{
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int ret;
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unsigned long runcntl = SPU_RUNCNTL_RUNNABLE;
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if ((ret = spu_acquire_runnable(ctx)) != 0)
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return ret;
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ctx->ops->npc_write(ctx, *npc);
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ctx->ops->runcntl_write(ctx, SPU_RUNCNTL_RUNNABLE);
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if (ctx->flags & SPU_CREATE_ISOLATE)
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runcntl |= SPU_RUNCNTL_ISOLATE;
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else
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ctx->ops->npc_write(ctx, *npc);
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ctx->ops->runcntl_write(ctx, runcntl);
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return 0;
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}
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@ -135,6 +135,7 @@ struct spufs_inode_info {
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container_of(inode, struct spufs_inode_info, vfs_inode)
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extern struct tree_descr spufs_dir_contents[];
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extern struct tree_descr spufs_dir_nosched_contents[];
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/* system call implementation */
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long spufs_run_spu(struct file *file,
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@ -1916,6 +1916,51 @@ static void save_lscsa(struct spu_state *prev, struct spu *spu)
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wait_spu_stopped(prev, spu); /* Step 57. */
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}
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static void force_spu_isolate_exit(struct spu *spu)
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{
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struct spu_problem __iomem *prob = spu->problem;
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struct spu_priv2 __iomem *priv2 = spu->priv2;
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/* Stop SPE execution and wait for completion. */
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out_be32(&prob->spu_runcntl_RW, SPU_RUNCNTL_STOP);
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iobarrier_rw();
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POLL_WHILE_TRUE(in_be32(&prob->spu_status_R) & SPU_STATUS_RUNNING);
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/* Restart SPE master runcntl. */
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spu_mfc_sr1_set(spu, MFC_STATE1_MASTER_RUN_CONTROL_MASK);
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iobarrier_w();
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/* Initiate isolate exit request and wait for completion. */
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out_be64(&priv2->spu_privcntl_RW, 4LL);
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iobarrier_w();
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out_be32(&prob->spu_runcntl_RW, 2);
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iobarrier_rw();
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POLL_WHILE_FALSE((in_be32(&prob->spu_status_R)
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& SPU_STATUS_STOPPED_BY_STOP));
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/* Reset load request to normal. */
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out_be64(&priv2->spu_privcntl_RW, SPU_PRIVCNT_LOAD_REQUEST_NORMAL);
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iobarrier_w();
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}
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/**
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* stop_spu_isolate
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* Check SPU run-control state and force isolated
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* exit function as necessary.
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*/
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static void stop_spu_isolate(struct spu *spu)
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{
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struct spu_problem __iomem *prob = spu->problem;
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if (in_be32(&prob->spu_status_R) & SPU_STATUS_ISOLATED_STATE) {
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/* The SPU is in isolated state; the only way
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* to get it out is to perform an isolated
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* exit (clean) operation.
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*/
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force_spu_isolate_exit(spu);
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}
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}
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static void harvest(struct spu_state *prev, struct spu *spu)
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{
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/*
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@ -1928,6 +1973,7 @@ static void harvest(struct spu_state *prev, struct spu *spu)
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inhibit_user_access(prev, spu); /* Step 3. */
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terminate_spu_app(prev, spu); /* Step 4. */
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set_switch_pending(prev, spu); /* Step 5. */
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stop_spu_isolate(spu); /* NEW. */
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remove_other_spu_access(prev, spu); /* Step 6. */
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suspend_mfc(prev, spu); /* Step 7. */
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wait_suspend_mfc_complete(prev, spu); /* Step 8. */
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@ -2096,11 +2142,11 @@ int spu_save(struct spu_state *prev, struct spu *spu)
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acquire_spu_lock(spu); /* Step 1. */
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rc = __do_spu_save(prev, spu); /* Steps 2-53. */
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release_spu_lock(spu);
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if (rc) {
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if (rc != 0 && rc != 2 && rc != 6) {
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panic("%s failed on SPU[%d], rc=%d.\n",
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__func__, spu->number, rc);
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}
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return rc;
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return 0;
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}
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EXPORT_SYMBOL_GPL(spu_save);
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@ -181,8 +181,10 @@ extern struct spufs_calls {
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*/
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#define SPU_CREATE_EVENTS_ENABLED 0x0001
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#define SPU_CREATE_GANG 0x0002
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#define SPU_CREATE_NOSCHED 0x0004
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#define SPU_CREATE_ISOLATE 0x0008
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#define SPU_CREATE_FLAG_ALL 0x0003 /* mask of all valid flags */
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#define SPU_CREATE_FLAG_ALL 0x000f /* mask of all valid flags */
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#ifdef CONFIG_SPU_FS_MODULE
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@ -276,6 +278,7 @@ struct spu_problem {
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u32 spu_runcntl_RW; /* 0x401c */
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#define SPU_RUNCNTL_STOP 0L
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#define SPU_RUNCNTL_RUNNABLE 1L
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#define SPU_RUNCNTL_ISOLATE 2L
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u8 pad_0x4020_0x4024[0x4]; /* 0x4020 */
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u32 spu_status_R; /* 0x4024 */
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#define SPU_STOP_STATUS_SHIFT 16
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