src/lib/imd_cbmem.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #include <assert.h>
   4 #include <boot/coreboot_tables.h>
   5 #include <bootmem.h>
   6 #include <console/console.h>
   7 #include <cbmem.h>
   8 #include <imd.h>
   9 #include <lib.h>
  10 #include <types.h>
  11
  12 /* The program loader passes on cbmem_top and the program entry point
  13    has to fill in the _cbmem_top_ptr symbol based on the calling arguments. */
  14 uintptr_t _cbmem_top_ptr;
  15
  16 static struct imd imd;
  17
  18 uintptr_t cbmem_top(void)
  19 {
  20         if (ENV_CREATES_CBMEM) {
  21                 static uintptr_t top;
  22                 if (top)
  23                         return top;
  24                 top = cbmem_top_chipset();
  25                 return top;
  26         }
  27         if (ENV_POSTCAR || ENV_RAMSTAGE)
  28                 return _cbmem_top_ptr;
  29
  30         dead_code();
  31 }
  32
  33 int cbmem_initialized;
  34
  35 static inline const struct cbmem_entry *imd_to_cbmem(const struct imd_entry *e)
  36 {
  37         return (const struct cbmem_entry *)e;
  38 }
  39
  40 static inline const struct imd_entry *cbmem_to_imd(const struct cbmem_entry *e)
  41 {
  42         return (const struct imd_entry *)e;
  43 }
  44
  45 void cbmem_initialize_empty(void)
  46 {
  47         cbmem_initialize_empty_id_size(0, 0);
  48 }
  49
  50 static void cbmem_top_init_once(void)
  51 {
  52         /* Call one-time hook on expected cbmem init during boot. */
  53         if (!ENV_CREATES_CBMEM)
  54                 return;
  55
  56         /* The test is only effective on X86 and when address hits UC memory. */
  57         if (ENV_X86)
  58                 quick_ram_check_or_die(cbmem_top() - sizeof(u32));
  59 }
  60
  61 void cbmem_initialize_empty_id_size(u32 id, u64 size)
  62 {
  63         const int no_recovery = 0;
  64
  65         cbmem_top_init_once();
  66
  67         imd_handle_init(&imd, (void *)cbmem_top());
  68
  69         printk(BIOS_DEBUG, "CBMEM:\n");
  70
  71         if (imd_create_tiered_empty(&imd, CBMEM_ROOT_MIN_SIZE, CBMEM_LG_ALIGN,
  72                                         CBMEM_SM_ROOT_SIZE, CBMEM_SM_ALIGN)) {
  73                 printk(BIOS_DEBUG, "failed.\n");
  74                 return;
  75         }
  76
  77         /* Add the specified range first */
  78         if (size)
  79                 cbmem_add(id, size);
  80
  81         /* Complete migration to CBMEM. */
  82         cbmem_run_init_hooks(no_recovery);
  83
  84         cbmem_initialized = 1;
  85 }
  86
  87 int cbmem_initialize(void)
  88 {
  89         return cbmem_initialize_id_size(0, 0);
  90 }
  91
  92 int cbmem_initialize_id_size(u32 id, u64 size)
  93 {
  94         const int recovery = 1;
  95
  96         cbmem_top_init_once();
  97
  98         imd_handle_init(&imd, (void *)cbmem_top());
  99
 100         if (imd_recover(&imd))
 101                 return 1;
 102
 103         /*
 104          * Lock the imd in romstage on a recovery. The assumption is that
 105          * if the imd area was recovered in romstage then S3 resume path
 106          * is being taken.
 107          */
 108         if (ENV_CREATES_CBMEM)
 109                 imd_lockdown(&imd);
 110
 111         /* Add the specified range first */
 112         if (size)
 113                 cbmem_add(id, size);
 114
 115         /* Complete migration to CBMEM. */
 116         cbmem_run_init_hooks(recovery);
 117
 118         cbmem_initialized = 1;
 119
 120         /* Recovery successful. */
 121         return 0;
 122 }
 123
 124 int cbmem_recovery(int is_wakeup)
 125 {
 126         int rv = 0;
 127         if (!is_wakeup)
 128                 cbmem_initialize_empty();
 129         else
 130                 rv = cbmem_initialize();
 131         return rv;
 132 }
 133
 134 const struct cbmem_entry *cbmem_entry_add(u32 id, u64 size64)
 135 {
 136         const struct imd_entry *e;
 137
 138         e = imd_entry_find_or_add(&imd, id, size64);
 139
 140         return imd_to_cbmem(e);
 141 }
 142
 143 void *cbmem_add(u32 id, u64 size)
 144 {
 145         const struct imd_entry *e;
 146
 147         e = imd_entry_find_or_add(&imd, id, size);
 148
 149         if (e == NULL)
 150                 return NULL;
 151
 152         return imd_entry_at(&imd, e);
 153 }
 154
 155 /* Retrieve a region provided a given id. */
 156 const struct cbmem_entry *cbmem_entry_find(u32 id)
 157 {
 158         const struct imd_entry *e;
 159
 160         e = imd_entry_find(&imd, id);
 161
 162         return imd_to_cbmem(e);
 163 }
 164
 165 void *cbmem_find(u32 id)
 166 {
 167         const struct imd_entry *e;
 168
 169         e = imd_entry_find(&imd, id);
 170
 171         if (e == NULL)
 172                 return NULL;
 173
 174         return imd_entry_at(&imd, e);
 175 }
 176
 177 /* Remove a reserved region. Returns 0 on success, < 0 on error. Note: A region
 178  * cannot be removed unless it was the last one added. */
 179 int cbmem_entry_remove(const struct cbmem_entry *entry)
 180 {
 181         return imd_entry_remove(&imd, cbmem_to_imd(entry));
 182 }
 183
 184 u64 cbmem_entry_size(const struct cbmem_entry *entry)
 185 {
 186         return imd_entry_size(cbmem_to_imd(entry));
 187 }
 188
 189 void *cbmem_entry_start(const struct cbmem_entry *entry)
 190 {
 191         return imd_entry_at(&imd, cbmem_to_imd(entry));
 192 }
 193
 194 void cbmem_add_bootmem(void)
 195 {
 196         void *baseptr;
 197         size_t size;
 198
 199         if (cbmem_get_region(&baseptr, &size)) {
 200                 printk(BIOS_ERR, "CBMEM pointer/size not found!\n");
 201                 return;
 202         }
 203         bootmem_add_range((uintptr_t)baseptr, size, BM_MEM_TABLE);
 204 }
 205
 206 int cbmem_get_region(void **baseptr, size_t *size)
 207 {
 208         return imd_region_used(&imd, baseptr, size);
 209 }
 210
 211 #if ENV_PAYLOAD_LOADER || (CONFIG(EARLY_CBMEM_LIST) && ENV_HAS_CBMEM)
 212 /*
 213  * -fdata-sections doesn't work so well on read only strings. They all
 214  * get put in the same section even though those strings may never be
 215  * referenced in the final binary.
 216  */
 217 void cbmem_list(void)
 218 {
 219         static const struct imd_lookup lookup[] = { CBMEM_ID_TO_NAME_TABLE };
 220
 221         imd_print_entries(&imd, lookup, ARRAY_SIZE(lookup));
 222 }
 223 #endif
 224
 225 void cbmem_add_records_to_cbtable(struct lb_header *header)
 226 {
 227         struct imd_cursor cursor;
 228
 229         if (imd_cursor_init(&imd, &cursor))
 230                 return;
 231
 232         while (1) {
 233                 const struct imd_entry *e;
 234                 struct lb_cbmem_entry *lbe;
 235                 uint32_t id;
 236
 237                 e = imd_cursor_next(&cursor);
 238
 239                 if (e == NULL)
 240                         break;
 241
 242                 id = imd_entry_id(e);
 243                 /* Don't add these metadata entries. */
 244                 if (id == CBMEM_ID_IMD_ROOT || id == CBMEM_ID_IMD_SMALL)
 245                         continue;
 246
 247                 lbe = (struct lb_cbmem_entry *)lb_new_record(header);
 248                 lbe->tag = LB_TAG_CBMEM_ENTRY;
 249                 lbe->size = sizeof(*lbe);
 250                 lbe->address = (uintptr_t)imd_entry_at(&imd, e);
 251                 lbe->entry_size = imd_entry_size(e);
 252                 lbe->id = id;
 253         }
 254 }