SLW: Add opal_slw_set_reg support for power9

This OPAL call is made from Linux to OPAL to configure values in
various SPRs after wakeup from a deep idle state.

Signed-off-by: Akshay Adiga <akshay.adiga@linux.vnet.ibm.com>
Reviewed-by: Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com>
Signed-off-by: Stewart Smith <stewart@linux.vnet.ibm.com>

hw/slw.c

@@ -30,6 +30,7 @@
 #include <libfdt/libfdt.h>
 #include <opal-api.h>
 
+#include <p9_stop_api.H>
 #include <p8_pore_table_gen_api.H>
 #include <sbe_xip_image.h>
 
@@ -1402,41 +1403,60 @@ int64_t opal_slw_set_reg(uint64_t cpu_pir, uint64_t sprn, uint64_t val)
 
 	struct cpu_thread *c = find_cpu_by_pir(cpu_pir);
 	struct proc_chip *chip;
-	void *image;
 	int rc;
-	int i;
-	int spr_is_supported = 0;
 
 	assert(c);
 	chip = get_chip(c->chip_id);
 	assert(chip);
-	image = (void *) chip->slw_base;
 
-	/* Check of the SPR is supported by libpore */
-	for ( i=0; i < SLW_SPR_REGS_SIZE ; i++)  {
-		if (sprn == SLW_SPR_REGS[i].value)  {
-			spr_is_supported = 1;
-			break;
+	if (proc_gen == proc_gen_p9) {
+		if (!chip->homer_base) {
+			log_simple_error(&e_info(OPAL_RC_SLW_REG),
+					 "SLW: HOMER base not set %x\n",
+					 chip->id);
+			return OPAL_INTERNAL_ERROR;
 		}
-	}
-	if (!spr_is_supported) {
-		log_simple_error(&e_info(OPAL_RC_SLW_REG),
+		rc = p9_stop_save_cpureg((void *)chip->homer_base,
+					 sprn, val, cpu_pir);
+
+	} else if (proc_gen == proc_gen_p8) {
+		int spr_is_supported = 0;
+		void *image;
+		int i;
+
+		/* Check of the SPR is supported by libpore */
+		for (i = 0; i < SLW_SPR_REGS_SIZE ; i++)  {
+			if (sprn == SLW_SPR_REGS[i].value)  {
+				spr_is_supported = 1;
+				break;
+			}
+		}
+		if (!spr_is_supported) {
+			log_simple_error(&e_info(OPAL_RC_SLW_REG),
 			"SLW: Trying to set unsupported spr for CPU %x\n",
-			c->pir);
+				c->pir);
+			return OPAL_UNSUPPORTED;
+		}
+		image = (void *)chip->slw_base;
+		rc = p8_pore_gen_cpureg_fixed(image, P8_SLW_MODEBUILD_SRAM,
+					      sprn, val,
+					      cpu_get_core_index(c),
+					      cpu_get_thread_index(c));
+	} else {
+		log_simple_error(&e_info(OPAL_RC_SLW_REG),
+		"SLW: proc_gen not supported\n");
 		return OPAL_UNSUPPORTED;
-	}
 
-	rc = p8_pore_gen_cpureg_fixed(image, P8_SLW_MODEBUILD_SRAM, sprn,
-						val, cpu_get_core_index(c),
-						cpu_get_thread_index(c));
+	}
 
 	if (rc) {
 		log_simple_error(&e_info(OPAL_RC_SLW_REG),
-			"SLW: Failed to set spr for CPU %x\n",
-			c->pir);
+			"SLW: Failed to set spr %llx for CPU %x, RC=0x%x\n",
+			sprn, c->pir, rc);
 		return OPAL_INTERNAL_ERROR;
 	}
-
+	prlog(PR_DEBUG, "SLW: restore spr:0x%llx on c:0x%x with 0x%llx\n",
+	      sprn, c->pir, val);
 	return OPAL_SUCCESS;
 
 }