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
29struct 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 */
39static __initdata struct hypertas_fw_feature
40hypertas_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	{FW_FEATURE_ENERGY_SCALE_INFO,	"hcall-energy-scale-info"},
70	{FW_FEATURE_WATCHDOG,		"hcall-watchdog"},
71	{FW_FEATURE_PLPKS,		"hcall-pks"},
72};
73
74/* Build up the firmware features bitmask using the contents of
75 * device-tree/ibm,hypertas-functions.  Ultimately this functionality may
76 * be moved into prom.c prom_init().
77 */
78static void __init fw_hypertas_feature_init(const char *hypertas,
79					    unsigned long len)
80{
81	const char *s;
82	int i;
83
84	pr_debug(" -> fw_hypertas_feature_init()\n");
85
86	for (s = hypertas; s < hypertas + len; s += strlen(s) + 1) {
87		for (i = 0; i < ARRAY_SIZE(hypertas_fw_features_table); i++) {
88			const char *name = hypertas_fw_features_table[i].name;
89			size_t size;
90
91			/*
92			 * If there is a '*' at the end of name, only check
93			 * upto there
94			 */
95			size = strlen(name);
96			if (size && name[size - 1] == '*') {
97				if (strncmp(name, s, size - 1))
98					continue;
99			} else if (strcmp(name, s))
100				continue;
101
102			/* we have a match */
103			powerpc_firmware_features |=
104				hypertas_fw_features_table[i].val;
105			break;
106		}
107	}
108
109	if (is_secure_guest() &&
110	    (powerpc_firmware_features & FW_FEATURE_PUT_TCE_IND)) {
111		powerpc_firmware_features &= ~FW_FEATURE_PUT_TCE_IND;
112		pr_debug("SVM: disabling PUT_TCE_IND firmware feature\n");
113	}
114
115	pr_debug(" <- fw_hypertas_feature_init()\n");
116}
117
118struct vec5_fw_feature {
119	unsigned long	val;
120	unsigned int	feature;
121};
122
123static __initdata struct vec5_fw_feature
124vec5_fw_features_table[] = {
125	{FW_FEATURE_FORM1_AFFINITY,	OV5_FORM1_AFFINITY},
126	{FW_FEATURE_PRRN,		OV5_PRRN},
127	{FW_FEATURE_DRMEM_V2,		OV5_DRMEM_V2},
128	{FW_FEATURE_DRC_INFO,		OV5_DRC_INFO},
129	{FW_FEATURE_FORM2_AFFINITY,	OV5_FORM2_AFFINITY},
130};
131
132static void __init fw_vec5_feature_init(const char *vec5, unsigned long len)
133{
134	unsigned int index, feat;
135	int i;
136
137	pr_debug(" -> fw_vec5_feature_init()\n");
138
139	for (i = 0; i < ARRAY_SIZE(vec5_fw_features_table); i++) {
140		index = OV5_INDX(vec5_fw_features_table[i].feature);
141		feat = OV5_FEAT(vec5_fw_features_table[i].feature);
142
143		if (index < len && (vec5[index] & feat))
144			powerpc_firmware_features |=
145				vec5_fw_features_table[i].val;
146	}
147
148	pr_debug(" <- fw_vec5_feature_init()\n");
149}
150
151/*
152 * Called very early, MMU is off, device-tree isn't unflattened
153 */
154static int __init probe_fw_features(unsigned long node, const char *uname, int
155				    depth, void *data)
156{
157	const char *prop;
158	int len;
159	static int hypertas_found;
160	static int vec5_found;
161
162	if (depth != 1)
163		return 0;
164
165	if (!strcmp(uname, "rtas") || !strcmp(uname, "rtas@0")) {
166		prop = of_get_flat_dt_prop(node, "ibm,hypertas-functions",
167					   &len);
168		if (prop) {
169			powerpc_firmware_features |= FW_FEATURE_LPAR;
170			fw_hypertas_feature_init(prop, len);
171		}
172
173		hypertas_found = 1;
174	}
175
176	if (!strcmp(uname, "chosen")) {
177		prop = of_get_flat_dt_prop(node, "ibm,architecture-vec-5",
178					   &len);
179		if (prop)
180			fw_vec5_feature_init(prop, len);
181
182		vec5_found = 1;
183	}
184
185	return hypertas_found && vec5_found;
186}
187
188void __init pseries_probe_fw_features(void)
189{
190	of_scan_flat_dt(probe_fw_features, NULL);
191}
192