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6c6ea537 NF |
1 | /* |
2 | * Dynamic reconfiguration memory support | |
3 | * | |
4 | * Copyright 2017 IBM Corporation | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License | |
8 | * as published by the Free Software Foundation; either version | |
9 | * 2 of the License, or (at your option) any later version. | |
10 | */ | |
11 | ||
12 | #define pr_fmt(fmt) "drmem: " fmt | |
13 | ||
14 | #include <linux/kernel.h> | |
15 | #include <linux/of.h> | |
16 | #include <linux/of_fdt.h> | |
17 | #include <linux/memblock.h> | |
18 | #include <asm/prom.h> | |
19 | #include <asm/drmem.h> | |
20 | ||
21 | static struct drmem_lmb_info __drmem_info; | |
22 | struct drmem_lmb_info *drmem_info = &__drmem_info; | |
23 | ||
514a9cb3 NF |
24 | u64 drmem_lmb_memory_max(void) |
25 | { | |
26 | struct drmem_lmb *last_lmb; | |
27 | ||
28 | last_lmb = &drmem_info->lmbs[drmem_info->n_lmbs - 1]; | |
29 | return last_lmb->base_addr + drmem_lmb_size(); | |
30 | } | |
31 | ||
6c6ea537 NF |
32 | static void __init read_drconf_v1_cell(struct drmem_lmb *lmb, |
33 | const __be32 **prop) | |
34 | { | |
35 | const __be32 *p = *prop; | |
36 | ||
37 | lmb->base_addr = dt_mem_next_cell(dt_root_addr_cells, &p); | |
38 | lmb->drc_index = of_read_number(p++, 1); | |
39 | ||
40 | p++; /* skip reserved field */ | |
41 | ||
42 | lmb->aa_index = of_read_number(p++, 1); | |
43 | lmb->flags = of_read_number(p++, 1); | |
44 | ||
45 | *prop = p; | |
46 | } | |
47 | ||
48 | static void __init __walk_drmem_v1_lmbs(const __be32 *prop, const __be32 *usm, | |
49 | void (*func)(struct drmem_lmb *, const __be32 **)) | |
50 | { | |
51 | struct drmem_lmb lmb; | |
52 | u32 i, n_lmbs; | |
53 | ||
54 | n_lmbs = of_read_number(prop++, 1); | |
55 | ||
56 | for (i = 0; i < n_lmbs; i++) { | |
57 | read_drconf_v1_cell(&lmb, &prop); | |
58 | func(&lmb, &usm); | |
59 | } | |
60 | } | |
61 | ||
514a9cb3 | 62 | #ifdef CONFIG_PPC_PSERIES |
6c6ea537 NF |
63 | void __init walk_drmem_lmbs_early(unsigned long node, |
64 | void (*func)(struct drmem_lmb *, const __be32 **)) | |
65 | { | |
66 | const __be32 *prop, *usm; | |
67 | int len; | |
68 | ||
69 | prop = of_get_flat_dt_prop(node, "ibm,lmb-size", &len); | |
70 | if (!prop || len < dt_root_size_cells * sizeof(__be32)) | |
71 | return; | |
72 | ||
73 | drmem_info->lmb_size = dt_mem_next_cell(dt_root_size_cells, &prop); | |
74 | ||
75 | usm = of_get_flat_dt_prop(node, "linux,drconf-usable-memory", &len); | |
76 | ||
77 | prop = of_get_flat_dt_prop(node, "ibm,dynamic-memory", &len); | |
78 | if (prop) | |
79 | __walk_drmem_v1_lmbs(prop, usm, func); | |
80 | ||
81 | memblock_dump_all(); | |
82 | } | |
83 | ||
84 | #endif | |
514a9cb3 NF |
85 | |
86 | static int __init init_drmem_lmb_size(struct device_node *dn) | |
87 | { | |
88 | const __be32 *prop; | |
89 | int len; | |
90 | ||
91 | if (drmem_info->lmb_size) | |
92 | return 0; | |
93 | ||
94 | prop = of_get_property(dn, "ibm,lmb-size", &len); | |
95 | if (!prop || len < dt_root_size_cells * sizeof(__be32)) { | |
96 | pr_info("Could not determine LMB size\n"); | |
97 | return -1; | |
98 | } | |
99 | ||
100 | drmem_info->lmb_size = dt_mem_next_cell(dt_root_size_cells, &prop); | |
101 | return 0; | |
102 | } | |
103 | ||
104 | /* | |
105 | * Returns the property linux,drconf-usable-memory if | |
106 | * it exists (the property exists only in kexec/kdump kernels, | |
107 | * added by kexec-tools) | |
108 | */ | |
109 | static const __be32 *of_get_usable_memory(struct device_node *dn) | |
110 | { | |
111 | const __be32 *prop; | |
112 | u32 len; | |
113 | ||
114 | prop = of_get_property(dn, "linux,drconf-usable-memory", &len); | |
115 | if (!prop || len < sizeof(unsigned int)) | |
116 | return NULL; | |
117 | ||
118 | return prop; | |
119 | } | |
120 | ||
121 | void __init walk_drmem_lmbs(struct device_node *dn, | |
122 | void (*func)(struct drmem_lmb *, const __be32 **)) | |
123 | { | |
124 | const __be32 *prop, *usm; | |
125 | ||
126 | if (init_drmem_lmb_size(dn)) | |
127 | return; | |
128 | ||
129 | usm = of_get_usable_memory(dn); | |
130 | ||
131 | prop = of_get_property(dn, "ibm,dynamic-memory", NULL); | |
132 | if (prop) | |
133 | __walk_drmem_v1_lmbs(prop, usm, func); | |
134 | } | |
135 | ||
136 | static void __init init_drmem_v1_lmbs(const __be32 *prop) | |
137 | { | |
138 | struct drmem_lmb *lmb; | |
139 | ||
140 | drmem_info->n_lmbs = of_read_number(prop++, 1); | |
141 | ||
142 | drmem_info->lmbs = kcalloc(drmem_info->n_lmbs, sizeof(*lmb), | |
143 | GFP_KERNEL); | |
144 | if (!drmem_info->lmbs) | |
145 | return; | |
146 | ||
147 | for_each_drmem_lmb(lmb) | |
148 | read_drconf_v1_cell(lmb, &prop); | |
149 | } | |
150 | ||
151 | static int __init drmem_init(void) | |
152 | { | |
153 | struct device_node *dn; | |
154 | const __be32 *prop; | |
155 | ||
156 | dn = of_find_node_by_path("/ibm,dynamic-reconfiguration-memory"); | |
157 | if (!dn) { | |
158 | pr_info("No dynamic reconfiguration memory found\n"); | |
159 | return 0; | |
160 | } | |
161 | ||
162 | if (init_drmem_lmb_size(dn)) { | |
163 | of_node_put(dn); | |
164 | return 0; | |
165 | } | |
166 | ||
167 | prop = of_get_property(dn, "ibm,dynamic-memory", NULL); | |
168 | if (prop) | |
169 | init_drmem_v1_lmbs(prop); | |
170 | ||
171 | of_node_put(dn); | |
172 | return 0; | |
173 | } | |
174 | late_initcall(drmem_init); |