[POWERPC] spufs: Load isolation kernel from spu_run
In order to fit with the "don't-run-spus-outside-of-spu_run" model, this
patch starts the isolated-mode loader in spu_run, rather than
spu_create. If spu_run is passed an isolated-mode context that isn't in
isolated mode state, it will run the loader.
This fixes potential races with the isolated SPE app doing a
stop-and-signal before the PPE has called spu_run: bugzilla #29111.
Also (in conjunction with a mambo patch), this addresses #28565, as we
always set the runcntrl register when entering spu_run.
It is up to libspe to ensure that isolated-mode apps are cleaned up
after running to completion - ie, put the app through the "ISOLATE EXIT"
state (see Ch11 of the CBEA).
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>
diff --git a/arch/powerpc/platforms/cell/spufs/inode.c b/arch/powerpc/platforms/cell/spufs/inode.c
index 1fbcc53..d5f0a21 100644
--- a/arch/powerpc/platforms/cell/spufs/inode.c
+++ b/arch/powerpc/platforms/cell/spufs/inode.c
@@ -34,8 +34,6 @@
#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>
#include <asm/uaccess.h>
@@ -43,7 +41,7 @@
#include "spufs.h"
static kmem_cache_t *spufs_inode_cache;
-static char *isolated_loader;
+char *isolated_loader;
static struct inode *
spufs_alloc_inode(struct super_block *sb)
@@ -235,102 +233,6 @@
.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;
-
- /* prevent concurrent operation with spu_run */
- down(&ctx->run_sema);
- ctx->ops->master_start(ctx);
-
- ret = spu_acquire_exclusive(ctx);
- if (ret)
- goto out;
-
- 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:
- spu_release_exclusive(ctx);
-out:
- ctx->ops->master_stop(ctx);
- up(&ctx->run_sema);
- return ret;
-}
-
-int spu_recycle_isolated(struct spu_context *ctx)
-{
- return spu_setup_isolated(ctx);
-}
-
static int
spufs_mkdir(struct inode *dir, struct dentry *dentry, unsigned int flags,
int mode)
@@ -439,15 +341,6 @@
out_unlock:
mutex_unlock(&inode->i_mutex);
out:
- if (ret >= 0 && (flags & SPU_CREATE_ISOLATE)) {
- int setup_err = spu_setup_isolated(
- SPUFS_I(dentry->d_inode)->i_ctx);
- /* FIXME: clean up context again on failure to avoid
- leak. */
- if (setup_err)
- ret = setup_err;
- }
-
dput(dentry);
return ret;
}
