[Skiboot] [PATCH 3/9] SLW: Call slw_late_init_p{8, 9} only when has_wakeup_engine is set

[Akshay Adiga]

Patch adds the following changes :
- Moves slw image sanity check to a seperate function called
 slw_image_check_p{8,9}()
- Move has_wakeup_engine to global scope, so that it can be set by other
functions
- Code which uses wakeup_engine will only be called if sanity check passes.

Signed-off-by: Akshay Adiga <akshay.adiga at linux.vnet.ibm.com>
---
 hw/slw.c | 51 +++++++++++++++++++++++++++++++++++++--------------
 1 file changed, 37 insertions(+), 14 deletions(-)

diff --git a/hw/slw.c b/hw/slw.c
index 2fdfa4e8..02aa67ea 100644
--- a/hw/slw.c
+++ b/hw/slw.c
@@ -40,6 +40,8 @@ static uint32_t slw_saved_reset[MAX_RESET_PATCH_SIZE];
 
 static bool slw_current_le = false;
 
+bool has_wakeup_engine = true;
+
 /* SLW timer related stuff */
 static bool slw_has_timer;
 static uint64_t slw_timer_inc;
@@ -808,12 +810,6 @@ static void slw_late_init_p9(struct proc_chip *chip)
 	struct cpu_thread *c;
 	int rc;
 
-	if (!chip->homer_base) {
-		log_simple_error(&e_info(OPAL_RC_SLW_REG),
-				 "SLW: HOMER base not set %x\n",
-				 chip->id);
-		return;
-	}
 	prlog(PR_NOTICE, "SLW: Configuring self-restore for HRMOR\n");
 	for_each_available_cpu(c) {
 		if (c->chip_id != chip->id)
@@ -843,7 +839,6 @@ void add_cpu_idle_state_properties(void)
 	int nr_states;
 
 	bool can_sleep = true;
-	bool has_wakeup_engine = true;
 	bool has_stop_inst = false;
 	u8 i;
 
@@ -1304,15 +1299,29 @@ static void slw_init_chip_p9(struct proc_chip *chip)
 
 
 }
-static void slw_late_init_p8(struct proc_chip *chip)
+
+static bool  slw_image_check_p9(struct proc_chip *chip)
 {
-	int64_t rc;
 
-	prlog(PR_DEBUG, "SLW: Init chip 0x%x\n", chip->id);
+	if (!chip->homer_base) {
+		log_simple_error(&e_info(OPAL_RC_SLW_REG),
+				 "SLW: HOMER base not set %x\n",
+				 chip->id);
+		return false;
+	} else
+		return true;
+
 
+}
+
+static bool  slw_image_check_p8(struct proc_chip *chip)
+{
+	int64_t rc;
+
+	prlog(PR_DEBUG, "SLW: slw_check chip 0x%x\n", chip->id);
 	if (!chip->slw_base) {
 		prerror("SLW: No image found !\n");
-		return;
+		return false;
 	}
 
 	/* Check actual image size */
@@ -1325,7 +1334,7 @@ static void slw_late_init_p8(struct proc_chip *chip)
 		chip->slw_base = 0;
 		chip->slw_bar_size = 0;
 		chip->slw_image_size = 0;
-		return;
+		return false;
 	}
 	prlog(PR_DEBUG, "SLW: Image size from image: 0x%llx\n",
 	      chip->slw_image_size);
@@ -1334,7 +1343,16 @@ static void slw_late_init_p8(struct proc_chip *chip)
 		log_simple_error(&e_info(OPAL_RC_SLW_INIT),
 			"SLW: Built-in image size larger than BAR size !\n");
 		/* XXX Panic ? */
+		return false;
 	}
+	return true;
+
+}
+
+static void slw_late_init_p8(struct proc_chip *chip)
+{
+
+	prlog(PR_DEBUG, "SLW: late Init chip 0x%x\n", chip->id);
 
 	/* Patch SLW image */
         slw_patch_regs(chip);
@@ -1344,6 +1362,7 @@ static void slw_init_chip_p8(struct proc_chip *chip)
 {
 	struct cpu_thread *c;
 
+	prlog(PR_DEBUG, "SLW: Init chip 0x%x\n", chip->id);
 	/* At power ON setup inits for fast-sleep */
 	for_each_available_core_in_chip(c, chip->id) {
 		idle_prepare_core(chip, c);
@@ -1691,13 +1710,17 @@ void slw_init(void)
 	if (proc_gen == proc_gen_p8) {
 		for_each_chip(chip) {
 			slw_init_chip_p8(chip);
-			slw_late_init_p8(chip);
+			has_wakeup_engine &= slw_image_check_p8(chip);
+			if (has_wakeup_engine)
+				slw_late_init_p8(chip);
 		}
 		slw_init_timer();
 	} else if (proc_gen == proc_gen_p9) {
 		for_each_chip(chip) {
 			slw_init_chip_p9(chip);
-			slw_late_init_p9(chip);
+			has_wakeup_engine &= slw_image_check_p9(chip);
+			if (has_wakeup_engine)
+				slw_late_init_p9(chip);
 		}
 	}
 	add_cpu_idle_state_properties();
-- 
2.14.3