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2023-12-08 01573e231f18eb2d99162747186f59511f56b64d 
 kernel/arch/powerpc/kernel/rtas.c
....@@ -1,14 +1,10 @@
1
+// SPDX-License-Identifier: GPL-2.0-or-later
12 /*
23  *
34  * Procedures for interfacing to the RTAS on CHRP machines.
45  *
56  * Peter Bergner, IBM	March 2001.
67  * Copyright (C) 2001 IBM.
7
- *
8
- *      This program is free software; you can redistribute it and/or
9
- *      modify it under the terms of the GNU General Public License
10
- *      as published by the Free Software Foundation; either version
11
- *      2 of the License, or (at your option) any later version.
128  */
139 
1410 #include <stdarg.h>
....@@ -20,6 +16,7 @@
2016 #include <linux/capability.h>
2117 #include <linux/delay.h>
2218 #include <linux/cpu.h>
19
+#include <linux/sched.h>
2320 #include <linux/smp.h>
2421 #include <linux/completion.h>
2522 #include <linux/cpumask.h>
....@@ -44,6 +41,7 @@
4441 #include <asm/time.h>
4542 #include <asm/mmu.h>
4643 #include <asm/topology.h>
44
+#include <asm/paca.h>
4745 
4846 /* This is here deliberately so it's only used in this file */
4947 void enter_rtas(unsigned long);
....@@ -845,97 +843,6 @@
845843 	__rtas_suspend_cpu((struct rtas_suspend_me_data *)info, 1);
846844 }
847845 
848
-enum rtas_cpu_state {
849
-	DOWN,
850
-	UP,
851
-};
852
-
853
-#ifndef CONFIG_SMP
854
-static int rtas_cpu_state_change_mask(enum rtas_cpu_state state,
855
-				cpumask_var_t cpus)
856
-{
857
-	if (!cpumask_empty(cpus)) {
858
-		cpumask_clear(cpus);
859
-		return -EINVAL;
860
-	} else
861
-		return 0;
862
-}
863
-#else
864
-/* On return cpumask will be altered to indicate CPUs changed.
865
- * CPUs with states changed will be set in the mask,
866
- * CPUs with status unchanged will be unset in the mask. */
867
-static int rtas_cpu_state_change_mask(enum rtas_cpu_state state,
868
-				cpumask_var_t cpus)
869
-{
870
-	int cpu;
871
-	int cpuret = 0;
872
-	int ret = 0;
873
-
874
-	if (cpumask_empty(cpus))
875
-		return 0;
876
-
877
-	for_each_cpu(cpu, cpus) {
878
-		struct device *dev = get_cpu_device(cpu);
879
-
880
-		switch (state) {
881
-		case DOWN:
882
-			cpuret = device_offline(dev);
883
-			break;
884
-		case UP:
885
-			cpuret = device_online(dev);
886
-			break;
887
-		}
888
-		if (cpuret < 0) {
889
-			pr_debug("%s: cpu_%s for cpu#%d returned %d.\n",
890
-					__func__,
891
-					((state == UP) ? "up" : "down"),
892
-					cpu, cpuret);
893
-			if (!ret)
894
-				ret = cpuret;
895
-			if (state == UP) {
896
-				/* clear bits for unchanged cpus, return */
897
-				cpumask_shift_right(cpus, cpus, cpu);
898
-				cpumask_shift_left(cpus, cpus, cpu);
899
-				break;
900
-			} else {
901
-				/* clear bit for unchanged cpu, continue */
902
-				cpumask_clear_cpu(cpu, cpus);
903
-			}
904
-		}
905
-	}
906
-
907
-	return ret;
908
-}
909
-#endif
910
-
911
-int rtas_online_cpus_mask(cpumask_var_t cpus)
912
-{
913
-	int ret;
914
-
915
-	ret = rtas_cpu_state_change_mask(UP, cpus);
916
-
917
-	if (ret) {
918
-		cpumask_var_t tmp_mask;
919
-
920
-		if (!alloc_cpumask_var(&tmp_mask, GFP_KERNEL))
921
-			return ret;
922
-
923
-		/* Use tmp_mask to preserve cpus mask from first failure */
924
-		cpumask_copy(tmp_mask, cpus);
925
-		rtas_offline_cpus_mask(tmp_mask);
926
-		free_cpumask_var(tmp_mask);
927
-	}
928
-
929
-	return ret;
930
-}
931
-EXPORT_SYMBOL(rtas_online_cpus_mask);
932
-
933
-int rtas_offline_cpus_mask(cpumask_var_t cpus)
934
-{
935
-	return rtas_cpu_state_change_mask(DOWN, cpus);
936
-}
937
-EXPORT_SYMBOL(rtas_offline_cpus_mask);
938
-
939846 int rtas_ibm_suspend_me(u64 handle)
940847 {
941848 	long state;
....@@ -943,8 +850,6 @@
943850 	unsigned long retbuf[PLPAR_HCALL_BUFSIZE];
944851 	struct rtas_suspend_me_data data;
945852 	DECLARE_COMPLETION_ONSTACK(done);
946
-	cpumask_var_t offline_mask;
947
-	int cpuret;
948853 
949854 	if (!rtas_service_present("ibm,suspend-me"))
950855 		return -ENOSYS;
....@@ -965,9 +870,6 @@
965870 		return -EIO;
966871 	}
967872 
968
-	if (!alloc_cpumask_var(&offline_mask, GFP_KERNEL))
969
-		return -ENOMEM;
970
-
971873 	atomic_set(&data.working, 0);
972874 	atomic_set(&data.done, 0);
973875 	atomic_set(&data.error, 0);
....@@ -976,43 +878,76 @@
976878 
977879 	lock_device_hotplug();
978880 
979
-	/* All present CPUs must be online */
980
-	cpumask_andnot(offline_mask, cpu_present_mask, cpu_online_mask);
981
-	cpuret = rtas_online_cpus_mask(offline_mask);
982
-	if (cpuret) {
983
-		pr_err("%s: Could not bring present CPUs online.\n", __func__);
984
-		atomic_set(&data.error, cpuret);
985
-		goto out;
986
-	}
987
-
988881 	cpu_hotplug_disable();
989
-	stop_topology_update();
990882 
991883 	/* Call function on all CPUs.  One of us will make the
992884 	 * rtas call
993885 	 */
994
-	if (on_each_cpu(rtas_percpu_suspend_me, &data, 0))
995
-		atomic_set(&data.error, -EINVAL);
886
+	on_each_cpu(rtas_percpu_suspend_me, &data, 0);
996887 
997888 	wait_for_completion(&done);
998889 
999890 	if (atomic_read(&data.error) != 0)
1000891 		printk(KERN_ERR "Error doing global join\n");
1001892 
1002
-	start_topology_update();
893
+
1003894 	cpu_hotplug_enable();
1004895 
1005
-	/* Take down CPUs not online prior to suspend */
1006
-	cpuret = rtas_offline_cpus_mask(offline_mask);
1007
-	if (cpuret)
1008
-		pr_warn("%s: Could not restore CPUs to offline state.\n",
1009
-				__func__);
1010
-
1011
-out:
1012896 	unlock_device_hotplug();
1013
-	free_cpumask_var(offline_mask);
897
+
1014898 	return atomic_read(&data.error);
1015899 }
900
+
901
+/**
902
+ * rtas_call_reentrant() - Used for reentrant rtas calls
903
+ * @token:	Token for desired reentrant RTAS call
904
+ * @nargs:	Number of Input Parameters
905
+ * @nret:	Number of Output Parameters
906
+ * @outputs:	Array of outputs
907
+ * @...:	Inputs for desired RTAS call
908
+ *
909
+ * According to LoPAR documentation, only "ibm,int-on", "ibm,int-off",
910
+ * "ibm,get-xive" and "ibm,set-xive" are currently reentrant.
911
+ * Reentrant calls need their own rtas_args buffer, so not using rtas.args, but
912
+ * PACA one instead.
913
+ *
914
+ * Return:	-1 on error,
915
+ *		First output value of RTAS call if (nret > 0),
916
+ *		0 otherwise,
917
+ */
918
+int rtas_call_reentrant(int token, int nargs, int nret, int *outputs, ...)
919
+{
920
+	va_list list;
921
+	struct rtas_args *args;
922
+	unsigned long flags;
923
+	int i, ret = 0;
924
+
925
+	if (!rtas.entry || token == RTAS_UNKNOWN_SERVICE)
926
+		return -1;
927
+
928
+	local_irq_save(flags);
929
+	preempt_disable();
930
+
931
+	/* We use the per-cpu (PACA) rtas args buffer */
932
+	args = local_paca->rtas_args_reentrant;
933
+
934
+	va_start(list, outputs);
935
+	va_rtas_call_unlocked(args, token, nargs, nret, list);
936
+	va_end(list);
937
+
938
+	if (nret > 1 && outputs)
939
+		for (i = 0; i < nret - 1; ++i)
940
+			outputs[i] = be32_to_cpu(args->rets[i + 1]);
941
+
942
+	if (nret > 0)
943
+		ret = be32_to_cpu(args->rets[0]);
944
+
945
+	local_irq_restore(flags);
946
+	preempt_enable();
947
+
948
+	return ret;
949
+}
950
+
1016951 #else /* CONFIG_PPC_PSERIES */
1017952 int rtas_ibm_suspend_me(u64 handle)
1018953 {
....@@ -1105,7 +1040,7 @@
11051040 	{ "get-time-of-day", -1, -1, -1, -1, -1 },
11061041 	{ "ibm,get-vpd", -1, 0, -1, 1, 2 },
11071042 	{ "ibm,lpar-perftools", -1, 2, 3, -1, -1 },
1108
-	{ "ibm,platform-dump", -1, 4, 5, -1, -1 },
1043
+	{ "ibm,platform-dump", -1, 4, 5, -1, -1 },		/* Special cased */
11091044 	{ "ibm,read-slot-reset-state", -1, -1, -1, -1, -1 },
11101045 	{ "ibm,scan-log-dump", -1, 0, 1, -1, -1 },
11111046 	{ "ibm,set-dynamic-indicator", -1, 2, -1, -1, -1 },
....@@ -1152,6 +1087,15 @@
11521087 				size = 1;
11531088 
11541089 			end = base + size - 1;
1090
+
1091
+			/*
1092
+			 * Special case for ibm,platform-dump - NULL buffer
1093
+			 * address is used to indicate end of dump processing
1094
+			 */
1095
+			if (!strcmp(f->name, "ibm,platform-dump") &&
1096
+			    base == 0)
1097
+				return false;
1098
+
11551099 			if (!in_rmo_buf(base, end))
11561100 				goto err;
11571101 		}
....@@ -1332,7 +1276,11 @@
13321276 		ibm_suspend_me_token = rtas_token("ibm,suspend-me");
13331277 	}
13341278 #endif
1335
-	rtas_rmo_buf = memblock_alloc_base(RTAS_RMOBUF_MAX, PAGE_SIZE, rtas_region);
1279
+	rtas_rmo_buf = memblock_phys_alloc_range(RTAS_RMOBUF_MAX, PAGE_SIZE,
1280
+						 0, rtas_region);
1281
+	if (!rtas_rmo_buf)
1282
+		panic("ERROR: RTAS: Failed to allocate %lx bytes below %pa\n",
1283
+		      PAGE_SIZE, &rtas_region);
13361284 
13371285 #ifdef CONFIG_RTAS_ERROR_LOGGING
13381286 	rtas_last_error_token = rtas_token("rtas-last-error");
....@@ -1357,6 +1305,12 @@
13571305 	entryp = of_get_flat_dt_prop(node, "linux,rtas-entry", NULL);
13581306 	sizep  = of_get_flat_dt_prop(node, "rtas-size", NULL);
13591307 
1308
+#ifdef CONFIG_PPC64
1309
+	/* need this feature to decide the crashkernel offset */
1310
+	if (of_get_flat_dt_prop(node, "ibm,hypertas-functions", NULL))
1311
+		powerpc_firmware_features |= FW_FEATURE_LPAR;
1312
+#endif
1313
+
13601314 	if (basep && entryp && sizep) {
13611315 		rtas.base = *basep;
13621316 		rtas.entry = *entryp;