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 };
69 
70 /* Build up the firmware features bitmask using the contents of
71  * device-tree/ibm,hypertas-functions.  Ultimately this functionality may
72  * be moved into prom.c prom_init().
73  */
74 static void __init fw_hypertas_feature_init(const char *hypertas,
75 					    unsigned long len)
76 {
77 	const char *s;
78 	int i;
79 
80 	pr_debug(" -> fw_hypertas_feature_init()\n");
81 
82 	for (s = hypertas; s < hypertas + len; s += strlen(s) + 1) {
83 		for (i = 0; i < ARRAY_SIZE(hypertas_fw_features_table); i++) {
84 			const char *name = hypertas_fw_features_table[i].name;
85 			size_t size;
86 
87 			/*
88 			 * If there is a '*' at the end of name, only check
89 			 * upto there
90 			 */
91 			size = strlen(name);
92 			if (size && name[size - 1] == '*') {
93 				if (strncmp(name, s, size - 1))
94 					continue;
95 			} else if (strcmp(name, s))
96 				continue;
97 
98 			/* we have a match */
99 			powerpc_firmware_features |=
100 				hypertas_fw_features_table[i].val;
101 			break;
102 		}
103 	}
104 
105 	if (is_secure_guest() &&
106 	    (powerpc_firmware_features & FW_FEATURE_PUT_TCE_IND)) {
107 		powerpc_firmware_features &= ~FW_FEATURE_PUT_TCE_IND;
108 		pr_debug("SVM: disabling PUT_TCE_IND firmware feature\n");
109 	}
110 
111 	pr_debug(" <- fw_hypertas_feature_init()\n");
112 }
113 
114 struct vec5_fw_feature {
115 	unsigned long	val;
116 	unsigned int	feature;
117 };
118 
119 static __initdata struct vec5_fw_feature
120 vec5_fw_features_table[] = {
121 	{FW_FEATURE_TYPE1_AFFINITY,	OV5_TYPE1_AFFINITY},
122 	{FW_FEATURE_PRRN,		OV5_PRRN},
123 	{FW_FEATURE_DRMEM_V2,		OV5_DRMEM_V2},
124 	{FW_FEATURE_DRC_INFO,		OV5_DRC_INFO},
125 };
126 
127 static void __init fw_vec5_feature_init(const char *vec5, unsigned long len)
128 {
129 	unsigned int index, feat;
130 	int i;
131 
132 	pr_debug(" -> fw_vec5_feature_init()\n");
133 
134 	for (i = 0; i < ARRAY_SIZE(vec5_fw_features_table); i++) {
135 		index = OV5_INDX(vec5_fw_features_table[i].feature);
136 		feat = OV5_FEAT(vec5_fw_features_table[i].feature);
137 
138 		if (index < len && (vec5[index] & feat))
139 			powerpc_firmware_features |=
140 				vec5_fw_features_table[i].val;
141 	}
142 
143 	pr_debug(" <- fw_vec5_feature_init()\n");
144 }
145 
146 /*
147  * Called very early, MMU is off, device-tree isn't unflattened
148  */
149 static int __init probe_fw_features(unsigned long node, const char *uname, int
150 				    depth, void *data)
151 {
152 	const char *prop;
153 	int len;
154 	static int hypertas_found;
155 	static int vec5_found;
156 
157 	if (depth != 1)
158 		return 0;
159 
160 	if (!strcmp(uname, "rtas") || !strcmp(uname, "rtas@0")) {
161 		prop = of_get_flat_dt_prop(node, "ibm,hypertas-functions",
162 					   &len);
163 		if (prop) {
164 			powerpc_firmware_features |= FW_FEATURE_LPAR;
165 			fw_hypertas_feature_init(prop, len);
166 		}
167 
168 		hypertas_found = 1;
169 	}
170 
171 	if (!strcmp(uname, "chosen")) {
172 		prop = of_get_flat_dt_prop(node, "ibm,architecture-vec-5",
173 					   &len);
174 		if (prop)
175 			fw_vec5_feature_init(prop, len);
176 
177 		vec5_found = 1;
178 	}
179 
180 	return hypertas_found && vec5_found;
181 }
182 
183 void __init pseries_probe_fw_features(void)
184 {
185 	of_scan_flat_dt(probe_fw_features, NULL);
186 }
187