Function behaves like alloc_spu_context() but instead of current-> init
task's informations are used and the problem state bit is removed.
Signed-off-by: Sebastian Siewior <sebastian@xxxxxxxxxxxxx>
--- a/arch/powerpc/platforms/cell/spufs/context.c
+++ b/arch/powerpc/platforms/cell/spufs/context.c
@@ -32,7 +32,8 @@
atomic_t nr_spu_contexts = ATOMIC_INIT(0);
-struct spu_context *alloc_spu_context(struct spu_gang *gang)
+static struct spu_context *__alloc_spu_context(struct spu_gang *gang,
+ struct mm_struct *mm)
{
struct spu_context *ctx;
ctx = kzalloc(sizeof *ctx, GFP_KERNEL);
@@ -54,7 +55,7 @@ struct spu_context *alloc_spu_context(st
init_waitqueue_head(&ctx->mfc_wq);
ctx->state = SPU_STATE_SAVED;
ctx->ops = &spu_backing_ops;
- ctx->owner = get_task_mm(current);
+ ctx->owner = mm;
INIT_LIST_HEAD(&ctx->rq);
INIT_LIST_HEAD(&ctx->aff_list);
if (gang)
@@ -73,6 +74,37 @@ out:
return ctx;
}
+struct spu_context *alloc_spu_context(struct spu_gang *gang)
+{
+ struct mm_struct *mm;
+ struct spu_context *ctx;
+
+ mm = get_task_mm(current);
+ ctx = __alloc_spu_context(gang, mm);
+ if (!ctx)
+ mmput(mm);
+ return ctx;
+}
+
+struct spu_context *kspu_alloc_context(void)
+{
+ struct spu_context *ctx;
+
+ /* for priviliged spu context, we borrow all the task specific
+ * informations from init_task.
+ */
+ atomic_inc(&init_mm.mm_users);
+ ctx = __alloc_spu_context(NULL, &init_mm);
+ if (!ctx) {
+ mmput(&init_mm);
+ return ctx;
+ }
+
+ /* remove problem state bit in order to access kernel memory */
+ ctx->csa.priv1.mfc_sr1_RW &= ~MFC_STATE1_PROBLEM_STATE_MASK;
+ return ctx;
+}
+
void destroy_spu_context(struct kref *kref)
{
struct spu_context *ctx;
--- a/arch/powerpc/platforms/cell/spufs/spufs.h
+++ b/arch/powerpc/platforms/cell/spufs/spufs.h
@@ -232,6 +232,7 @@ static inline void spu_release(struct sp
}
struct spu_context * alloc_spu_context(struct spu_gang *gang);
+struct spu_context *kspu_alloc_context(void);
void destroy_spu_context(struct kref *kref);
struct spu_context * get_spu_context(struct spu_context *ctx);
int put_spu_context(struct spu_context *ctx);
--
-
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