diff options
Diffstat (limited to 'arch/powerpc/platforms/cell/spufs/inode.c')
| -rw-r--r-- | arch/powerpc/platforms/cell/spufs/inode.c | 117 |
1 files changed, 117 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/cell/spufs/inode.c b/arch/powerpc/platforms/cell/spufs/inode.c index 787ae71a685..c8751936672 100644 --- a/arch/powerpc/platforms/cell/spufs/inode.c +++ b/arch/powerpc/platforms/cell/spufs/inode.c @@ -33,6 +33,8 @@ #include <linux/slab.h> #include <linux/parser.h> +#include <asm/prom.h> +#include <asm/spu_priv1.h> #include <asm/io.h> #include <asm/semaphore.h> #include <asm/spu.h> @@ -41,6 +43,7 @@ #include "spufs.h" static kmem_cache_t *spufs_inode_cache; +static char *isolated_loader; static struct inode * spufs_alloc_inode(struct super_block *sb) @@ -232,6 +235,89 @@ struct file_operations spufs_context_fops = { .fsync = simple_sync_file, }; +static int spu_setup_isolated(struct spu_context *ctx) +{ + int ret; + u64 __iomem *mfc_cntl; + u64 sr1; + u32 status; + unsigned long timeout; + const u32 status_loading = SPU_STATUS_RUNNING + | SPU_STATUS_ISOLATED_STATE | SPU_STATUS_ISOLATED_LOAD_STATUS; + + if (!isolated_loader) + return -ENODEV; + + if ((ret = spu_acquire_runnable(ctx)) != 0) + return ret; + + mfc_cntl = &ctx->spu->priv2->mfc_control_RW; + + /* purge the MFC DMA queue to ensure no spurious accesses before we + * enter kernel mode */ + timeout = jiffies + HZ; + out_be64(mfc_cntl, MFC_CNTL_PURGE_DMA_REQUEST); + while ((in_be64(mfc_cntl) & MFC_CNTL_PURGE_DMA_STATUS_MASK) + != MFC_CNTL_PURGE_DMA_COMPLETE) { + if (time_after(jiffies, timeout)) { + printk(KERN_ERR "%s: timeout flushing MFC DMA queue\n", + __FUNCTION__); + ret = -EIO; + goto out_unlock; + } + cond_resched(); + } + + /* put the SPE in kernel mode to allow access to the loader */ + sr1 = spu_mfc_sr1_get(ctx->spu); + sr1 &= ~MFC_STATE1_PROBLEM_STATE_MASK; + spu_mfc_sr1_set(ctx->spu, sr1); + + /* start the loader */ + ctx->ops->signal1_write(ctx, (unsigned long)isolated_loader >> 32); + ctx->ops->signal2_write(ctx, + (unsigned long)isolated_loader & 0xffffffff); + + ctx->ops->runcntl_write(ctx, + SPU_RUNCNTL_RUNNABLE | SPU_RUNCNTL_ISOLATE); + + ret = 0; + timeout = jiffies + HZ; + while (((status = ctx->ops->status_read(ctx)) & status_loading) == + status_loading) { + if (time_after(jiffies, timeout)) { + printk(KERN_ERR "%s: timeout waiting for loader\n", + __FUNCTION__); + ret = -EIO; + goto out_drop_priv; + } + cond_resched(); + } + + if (!(status & SPU_STATUS_RUNNING)) { + /* If isolated LOAD has failed: run SPU, we will get a stop-and + * signal later. */ + pr_debug("%s: isolated LOAD failed\n", __FUNCTION__); + ctx->ops->runcntl_write(ctx, SPU_RUNCNTL_RUNNABLE); + ret = -EACCES; + + } else if (!(status & SPU_STATUS_ISOLATED_STATE)) { + /* This isn't allowed by the CBEA, but check anyway */ + pr_debug("%s: SPU fell out of isolated mode?\n", __FUNCTION__); + ctx->ops->runcntl_write(ctx, SPU_RUNCNTL_STOP); + ret = -EINVAL; + } + +out_drop_priv: + /* Finished accessing the loader. Drop kernel mode */ + sr1 |= MFC_STATE1_PROBLEM_STATE_MASK; + spu_mfc_sr1_set(ctx->spu, sr1); + +out_unlock: + up_write(&ctx->state_sema); + return ret; +} + static int spufs_mkdir(struct inode *dir, struct dentry *dentry, unsigned int flags, int mode) @@ -255,6 +341,11 @@ spufs_mkdir(struct inode *dir, struct dentry *dentry, unsigned int flags, goto out_iput; ctx->flags = flags; + if (flags & SPU_CREATE_ISOLATE) { + ret = spu_setup_isolated(ctx); + if (ret) + goto out_iput; + } inode->i_op = &spufs_dir_inode_operations; inode->i_fop = &simple_dir_operations; @@ -555,6 +646,30 @@ spufs_parse_options(char *options, struct inode *root) return 1; } +static void +spufs_init_isolated_loader(void) +{ + struct device_node *dn; + const char *loader; + int size; + + dn = of_find_node_by_path("/spu-isolation"); + if (!dn) + return; + + loader = get_property(dn, "loader", &size); + if (!loader) + return; + + /* kmalloc should align on a 16 byte boundary..* */ + isolated_loader = kmalloc(size, GFP_KERNEL); + if (!isolated_loader) + return; + + memcpy(isolated_loader, loader, size); + printk(KERN_INFO "spufs: SPU isolation mode enabled\n"); +} + static int spufs_create_root(struct super_block *sb, void *data) { @@ -640,6 +755,8 @@ static int __init spufs_init(void) ret = register_spu_syscalls(&spufs_calls); if (ret) goto out_fs; + + spufs_init_isolated_loader(); return 0; out_fs: unregister_filesystem(&spufs_type); |