task: remove edf specific elements from context switching layer

The context switching layer is a common mechanism for all
pre-emptive schedulers and should not depend on data types
defined for any specific one.

Signed-off-by: Marcin Maka <marcin.maka@linux.intel.com>

src/arch/xtensa/include/arch/schedule/task.h

@@ -18,8 +18,6 @@
 #ifndef __ARCH_SCHEDULE_TASK_H__
 #define __ARCH_SCHEDULE_TASK_H__
 
-struct task;
-
 /**
  * \brief Returns main task data.
  * \return Pointer to pointer of main task data.
@@ -33,23 +31,32 @@ volatile void *task_context_get(void);
 
 /**
  * \brief Switches system context.
- * \param[in,out] task Task context to be set.
+ * \param[in,out] task_ctx Task context to be set.
  */
 void task_context_set(void *task_ctx);
 
 /**
- * \brief Initializes task context.
- * \param[in,out] task Task with context to be initialized.
- * \param[in,out] entry Entry point for task execution.
- * \param[in,out] data Parameter data for entry point.
+ * \brief Allocates task context.
+ * \param[in,out] task_ctx Assigned to allocated structure on return.
  */
-int task_context_init(struct task *task, void *entry, void *data);
+int task_context_alloc(void **task_ctx);
+
+/**
+ * \brief Initializes task context.
+ * \param[in,out] task_ctx Task context to be initialized.
+ * \param[in] entry Entry point for task execution.
+ * \param[in] arg0 First argument to be passed to entry function.
+ * \param[in] arg1 Second argument to be passed to entry function.
+ * \param[in] task_core Id of the core that task will be executed on.
+ */
+int task_context_init(void *task_ctx, void *entry, void *arg0, void *arg1,
+		      int task_core);
 
 /**
  * \brief Frees task context.
- * \param[in,out] task Task with context to be freed.
+ * \param[in,out] task_ctx Task with context to be freed.
  */
-void task_context_free(struct task *task);
+void task_context_free(void *task_ctx);
 
 /**
  * \brief Performs cache operation on task's context.

src/arch/xtensa/schedule/task.c

@@ -62,23 +62,26 @@ void task_context_set(void *task_ctx)
 	ctx->td.xtos_active_task = task_ctx;
 }
 
-int task_context_init(struct task *task, void *entry, void *data)
+int task_context_alloc(void **task_ctx)
 {
-	struct edf_task_pdata *edf_pdata = edf_sch_get_pdata(task);
-	xtos_task_context *ctx;
-	UserFrame *sp;
-
-	/* allocate task context */
-	ctx = rzalloc(RZONE_SYS_RUNTIME, SOF_MEM_CAPS_RAM, sizeof(*ctx));
-	if (!ctx)
+	*task_ctx = rzalloc(RZONE_SYS_RUNTIME, SOF_MEM_CAPS_RAM,
+			    sizeof(xtos_task_context));
+	if (!*task_ctx)
 		return -ENOMEM;
+	return 0;
+}
+
+int task_context_init(void *task_ctx, void *entry, void *arg0, void *arg1,
+		      int task_core)
+{
+	xtos_task_context *ctx = task_ctx;
+	UserFrame *sp;
 
 	/* allocate stack */
 	ctx->stack_base = rballoc(RZONE_BUFFER, SOF_MEM_CAPS_RAM,
 				  SOF_TASK_DEFAULT_STACK_SIZE);
 	if (!ctx->stack_base)
 		return -ENOMEM;
-
 	ctx->stack_size = SOF_TASK_DEFAULT_STACK_SIZE;
 
 	bzero(ctx->stack_base, ctx->stack_size);
@@ -98,31 +101,27 @@ int task_context_init(struct task *task, void *entry, void *data)
 	sp->ps = PS_WOECALL4_ABI | PS_UM;
 
 	/* a6 and a7 are the first parameters */
-	sp->a6 = (uint32_t)task;
-	sp->a7 = (uint32_t)data;
+	sp->a6 = (uint32_t)arg0;
+	sp->a7 = (uint32_t)arg1;
 
 	ctx->stack_pointer = sp;
 
 	/* flush for slave core */
-	if (cpu_is_slave(task->core))
+	if (cpu_is_slave(task_core))
 		task_context_cache(ctx, CACHE_WRITEBACK_INV);
 
-	edf_pdata->ctx = ctx;
-
 	return 0;
 }
 
-void task_context_free(struct task *task)
+void task_context_free(void *task_ctx)
 {
-	struct edf_task_pdata *edf_pdata = edf_sch_get_pdata(task);
-	xtos_task_context *ctx = edf_pdata->ctx;
+	xtos_task_context *ctx = task_ctx;
 
 	rfree(ctx->stack_base);
 	ctx->stack_size = 0;
 	ctx->stack_pointer = NULL;
 
 	rfree(ctx);
-	edf_pdata->ctx = NULL;
 }
 
 void task_context_cache(void *task_ctx, int cmd)

src/schedule/edf_schedule.c

@@ -155,7 +155,7 @@ static void schedule_edf_task(void *data, struct task *task, uint64_t start,
 
 static int schedule_edf_task_init(void *data, struct task *task)
 {
-	struct edf_task_pdata *edf_pdata;
+	struct edf_task_pdata *edf_pdata = NULL;
 
 	if (edf_sch_get_pdata(task))
 		return -EEXIST;
@@ -170,20 +170,26 @@ static int schedule_edf_task_init(void *data, struct task *task)
 
 	edf_sch_set_pdata(task, edf_pdata);
 
-	if (task_context_init(task, &schedule_edf_task_run, data) < 0) {
-		trace_edf_sch_error("schedule_edf_task_init() error: init "
-				    "context failed");
-		rfree(edf_pdata);
-		edf_sch_set_pdata(task, NULL);
-		return -EINVAL;
-	}
+	if (task_context_alloc(&edf_pdata->ctx) < 0)
+		goto error;
+	if (task_context_init(edf_pdata->ctx, &schedule_edf_task_run,
+			      task, data, task->core) < 0)
+		goto error;
 
 	/* flush for slave core */
 	if (cpu_is_slave(task->core))
 		dcache_writeback_invalidate_region(edf_pdata,
 						   sizeof(*edf_pdata));
-
 	return 0;
+
+error:
+	trace_edf_sch_error("schedule_edf_task_init() error: init "
+			    "context failed");
+	if (edf_pdata->ctx)
+		task_context_free(edf_pdata->ctx);
+	rfree(edf_pdata);
+	edf_sch_set_pdata(task, NULL);
+	return -EINVAL;
 }
 
 static void schedule_edf_task_running(void *data, struct task *task)
@@ -241,7 +247,8 @@ static void schedule_edf_task_free(void *data, struct task *task)
 
 	task->state = SOF_TASK_STATE_FREE;
 
-	task_context_free(task);
+	task_context_free(edf_pdata->ctx);
+	edf_pdata->ctx = NULL;
 	rfree(edf_pdata);
 	edf_sch_set_pdata(task, NULL);