1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  *  pSeries firmware setup code.
4  *
5  *  Portions from arch/powerpc/platforms/pseries/setup.c:
6  *   Copyright (C) 1995  Linus Torvalds
7  *   Adapted from 'alpha' version by Gary Thomas
8  *   Modified by Cort Dougan (cort@cs.nmt.edu)
9  *   Modified by PPC64 Team, IBM Corp
10  *
11  *  Portions from arch/powerpc/kernel/firmware.c
12  *   Copyright (C) 2001 Ben. Herrenschmidt (benh@kernel.crashing.org)
13  *   Modifications for ppc64:
14  *    Copyright (C) 2003 Dave Engebretsen <engebret@us.ibm.com>
15  *    Copyright (C) 2005 Stephen Rothwell, IBM Corporation
16  *
17  *  Copyright 2006 IBM Corporation.
18  */
19 
20 
21 #include <linux/of_fdt.h>
22 #include <asm/firmware.h>
23 #include <asm/prom.h>
24 #include <asm/udbg.h>
25 #include <asm/svm.h>
26 
27 #include "pseries.h"
28 
29 struct hypertas_fw_feature {
30     unsigned long val;
31     char * name;
32 };
33 
34 /*
35  * The names in this table match names in rtas/ibm,hypertas-functions.  If the
36  * entry ends in a '*', only upto the '*' is matched.  Otherwise the entire
37  * string must match.
38  */
39 static __initdata struct hypertas_fw_feature
40 hypertas_fw_features_table[] = {
41 	{FW_FEATURE_PFT,		"hcall-pft"},
42 	{FW_FEATURE_TCE,		"hcall-tce"},
43 	{FW_FEATURE_SPRG0,		"hcall-sprg0"},
44 	{FW_FEATURE_DABR,		"hcall-dabr"},
45 	{FW_FEATURE_COPY,		"hcall-copy"},
46 	{FW_FEATURE_ASR,		"hcall-asr"},
47 	{FW_FEATURE_DEBUG,		"hcall-debug"},
48 	{FW_FEATURE_PERF,		"hcall-perf"},
49 	{FW_FEATURE_DUMP,		"hcall-dump"},
50 	{FW_FEATURE_INTERRUPT,		"hcall-interrupt"},
51 	{FW_FEATURE_MIGRATE,		"hcall-migrate"},
52 	{FW_FEATURE_PERFMON,		"hcall-perfmon"},
53 	{FW_FEATURE_CRQ,		"hcall-crq"},
54 	{FW_FEATURE_VIO,		"hcall-vio"},
55 	{FW_FEATURE_RDMA,		"hcall-rdma"},
56 	{FW_FEATURE_LLAN,		"hcall-lLAN"},
57 	{FW_FEATURE_BULK_REMOVE,	"hcall-bulk"},
58 	{FW_FEATURE_XDABR,		"hcall-xdabr"},
59 	{FW_FEATURE_PUT_TCE_IND | FW_FEATURE_STUFF_TCE,
60 					"hcall-multi-tce"},
61 	{FW_FEATURE_SPLPAR,		"hcall-splpar"},
62 	{FW_FEATURE_VPHN,		"hcall-vphn"},
63 	{FW_FEATURE_SET_MODE,		"hcall-set-mode"},
64 	{FW_FEATURE_BEST_ENERGY,	"hcall-best-energy-1*"},
65 	{FW_FEATURE_HPT_RESIZE,		"hcall-hpt-resize"},
66 	{FW_FEATURE_BLOCK_REMOVE,	"hcall-block-remove"},
67 	{FW_FEATURE_PAPR_SCM,		"hcall-scm"},
68 	{FW_FEATURE_RPT_INVALIDATE,	"hcall-rpt-invalidate"},
69 };
70 
71 /* Build up the firmware features bitmask using the contents of
72  * device-tree/ibm,hypertas-functions.  Ultimately this functionality may
73  * be moved into prom.c prom_init().
74  */
75 static void __init fw_hypertas_feature_init(const char *hypertas,
76 					    unsigned long len)
77 {
78 	const char *s;
79 	int i;
80 
81 	pr_debug(" -> fw_hypertas_feature_init()\n");
82 
83 	for (s = hypertas; s < hypertas + len; s += strlen(s) + 1) {
84 		for (i = 0; i < ARRAY_SIZE(hypertas_fw_features_table); i++) {
85 			const char *name = hypertas_fw_features_table[i].name;
86 			size_t size;
87 
88 			/*
89 			 * If there is a '*' at the end of name, only check
90 			 * upto there
91 			 */
92 			size = strlen(name);
93 			if (size && name[size - 1] == '*') {
94 				if (strncmp(name, s, size - 1))
95 					continue;
96 			} else if (strcmp(name, s))
97 				continue;
98 
99 			/* we have a match */
100 			powerpc_firmware_features |=
101 				hypertas_fw_features_table[i].val;
102 			break;
103 		}
104 	}
105 
106 	if (is_secure_guest() &&
107 	    (powerpc_firmware_features & FW_FEATURE_PUT_TCE_IND)) {
108 		powerpc_firmware_features &= ~FW_FEATURE_PUT_TCE_IND;
109 		pr_debug("SVM: disabling PUT_TCE_IND firmware feature\n");
110 	}
111 
112 	pr_debug(" <- fw_hypertas_feature_init()\n");
113 }
114 
115 struct vec5_fw_feature {
116 	unsigned long	val;
117 	unsigned int	feature;
118 };
119 
120 static __initdata struct vec5_fw_feature
121 vec5_fw_features_table[] = {
122 	{FW_FEATURE_FORM1_AFFINITY,	OV5_FORM1_AFFINITY},
123 	{FW_FEATURE_PRRN,		OV5_PRRN},
124 	{FW_FEATURE_DRMEM_V2,		OV5_DRMEM_V2},
125 	{FW_FEATURE_DRC_INFO,		OV5_DRC_INFO},
126 	{FW_FEATURE_FORM2_AFFINITY,	OV5_FORM2_AFFINITY},
127 };
128 
129 static void __init fw_vec5_feature_init(const char *vec5, unsigned long len)
130 {
131 	unsigned int index, feat;
132 	int i;
133 
134 	pr_debug(" -> fw_vec5_feature_init()\n");
135 
136 	for (i = 0; i < ARRAY_SIZE(vec5_fw_features_table); i++) {
137 		index = OV5_INDX(vec5_fw_features_table[i].feature);
138 		feat = OV5_FEAT(vec5_fw_features_table[i].feature);
139 
140 		if (index < len && (vec5[index] & feat))
141 			powerpc_firmware_features |=
142 				vec5_fw_features_table[i].val;
143 	}
144 
145 	pr_debug(" <- fw_vec5_feature_init()\n");
146 }
147 
148 /*
149  * Called very early, MMU is off, device-tree isn't unflattened
150  */
151 static int __init probe_fw_features(unsigned long node, const char *uname, int
152 				    depth, void *data)
153 {
154 	const char *prop;
155 	int len;
156 	static int hypertas_found;
157 	static int vec5_found;
158 
159 	if (depth != 1)
160 		return 0;
161 
162 	if (!strcmp(uname, "rtas") || !strcmp(uname, "rtas@0")) {
163 		prop = of_get_flat_dt_prop(node, "ibm,hypertas-functions",
164 					   &len);
165 		if (prop) {
166 			powerpc_firmware_features |= FW_FEATURE_LPAR;
167 			fw_hypertas_feature_init(prop, len);
168 		}
169 
170 		hypertas_found = 1;
171 	}
172 
173 	if (!strcmp(uname, "chosen")) {
174 		prop = of_get_flat_dt_prop(node, "ibm,architecture-vec-5",
175 					   &len);
176 		if (prop)
177 			fw_vec5_feature_init(prop, len);
178 
179 		vec5_found = 1;
180 	}
181 
182 	return hypertas_found && vec5_found;
183 }
184 
185 void __init pseries_probe_fw_features(void)
186 {
187 	of_scan_flat_dt(probe_fw_features, NULL);
188 }
189