static int get_dyn_reconf_crash_memory_ranges(void)
{
uint64_t start, end;
char fname[128], buf[32];
FILE *file;
unsigned int i;
int n;
uint32_t flags;
strcpy(fname, "/proc/device-tree/");
strcat(fname, "ibm,dynamic-reconfiguration-memory/ibm,dynamic-memory");
if ((file = fopen(fname, "r")) == NULL) {
perror(fname);
return -1;
}
fseek(file, 4, SEEK_SET);
for (i = 0; i < num_of_lmbs; i++) {
if ((n = fread(buf, 1, 24, file)) < 0) {
perror(fname);
fclose(file);
return -1;
}
if (memory_ranges >= (max_memory_ranges + 1)) {
/* No space to insert another element. */
fprintf(stderr,
"Error: Number of crash memory ranges"
" excedeed the max limit\n");
return -1;
}
start = be64_to_cpu(((uint64_t *)buf)[DRCONF_ADDR]);
end = start + lmb_size;
if (start == 0 && end >= (BACKUP_SRC_END + 1))
start = BACKUP_SRC_END + 1;
flags = be32_to_cpu((*((uint32_t *)&buf[DRCONF_FLAGS])));
/* skip this block if the reserved bit is set in flags (0x80)
or if the block is not assigned to this partition (0x8) */
if ((flags & 0x80) || !(flags & 0x8))
continue;
exclude_crash_region(start, end);
}
fclose(file);
return 0;
}
/* Reads the appropriate file and retrieves the SYSTEM RAM regions for whom to
* create Elf headers. Keeping it separate from get_memory_ranges() as
* requirements are different in the case of normal kexec and crashdumps.
*
* Normal kexec needs to look at all of available physical memory irrespective
* of the fact how much of it is being used by currently running kernel.
* Crashdumps need to have access to memory regions actually being used by
* running kernel. Expecting a different file/data structure than /proc/iomem
* to look into down the line. May be something like /proc/kernelmem or may
* be zone data structures exported from kernel.
*/
static int get_crash_memory_ranges(struct memory_range **range, int *ranges)
{
char device_tree[256] = "/proc/device-tree/";
char fname[256];
char buf[MAXBYTES];
DIR *dir, *dmem;
FILE *file;
struct dirent *dentry, *mentry;
int i, n, crash_rng_len = 0;
unsigned long long start, end;
int page_size;
crash_max_memory_ranges = max_memory_ranges + 6;
crash_rng_len = sizeof(struct memory_range) * crash_max_memory_ranges;
crash_memory_range = (struct memory_range *) malloc(crash_rng_len);
if (!crash_memory_range) {
fprintf(stderr, "Allocation for crash memory range failed\n");
return -1;
}
memset(crash_memory_range, 0, crash_rng_len);
/* create a separate program header for the backup region */
crash_memory_range[0].start = BACKUP_SRC_START;
crash_memory_range[0].end = BACKUP_SRC_END + 1;
crash_memory_range[0].type = RANGE_RAM;
memory_ranges++;
if ((dir = opendir(device_tree)) == NULL) {
perror(device_tree);
goto err;
}
cstart = crash_base;
cend = crash_base + crash_size;
while ((dentry = readdir(dir)) != NULL) {
if (!strncmp(dentry->d_name,
"ibm,dynamic-reconfiguration-memory", 35)){
get_dyn_reconf_crash_memory_ranges();
continue;
}
if (strncmp(dentry->d_name, "memory@", 7) &&
strcmp(dentry->d_name, "memory"))
continue;
strcpy(fname, device_tree);
strcat(fname, dentry->d_name);
if ((dmem = opendir(fname)) == NULL) {
perror(fname);
closedir(dir);
goto err;
}
while ((mentry = readdir(dmem)) != NULL) {
if (strcmp(mentry->d_name, "reg"))
continue;
strcat(fname, "/reg");
if ((file = fopen(fname, "r")) == NULL) {
perror(fname);
closedir(dmem);
closedir(dir);
goto err;
}
if ((n = fread(buf, 1, MAXBYTES, file)) < 0) {
perror(fname);
fclose(file);
closedir(dmem);
closedir(dir);
goto err;
}
if (memory_ranges >= (max_memory_ranges + 1)) {
/* No space to insert another element. */
fprintf(stderr,
"Error: Number of crash memory ranges"
" excedeed the max limit\n");
goto err;
}
start = ((unsigned long long *)buf)[0];
end = start + ((unsigned long long *)buf)[1];
if (start == 0 && end >= (BACKUP_SRC_END + 1))
start = BACKUP_SRC_END + 1;
exclude_crash_region(start, end);
fclose(file);
}
closedir(dmem);
}
closedir(dir);
/*
* If RTAS region is overlapped with crashkernel, need to create ELF
* Program header for the overlapped memory.
*/
if (crash_base < rtas_base + rtas_size &&
rtas_base < crash_base + crash_size) {
page_size = getpagesize();
cstart = rtas_base;
cend = rtas_base + rtas_size;
if (cstart < crash_base)
cstart = crash_base;
if (cend > crash_base + crash_size)
cend = crash_base + crash_size;
/*
* The rtas section created here is formed by reading rtas-base
* and rtas-size from /proc/device-tree/rtas. Unfortunately
* rtas-size is not required to be a multiple of PAGE_SIZE
* The remainder of the page it ends on is just garbage, and is
* safe to read, its just not accounted in rtas-size. Since
* we're creating an elf section here though, lets round it up
* to the next page size boundary though, so makedumpfile can
* read it safely without going south on us.
*/
cend = (cend + page_size - 1) & (~(page_size - 1));
crash_memory_range[memory_ranges].start = cstart;
crash_memory_range[memory_ranges++].end = cend;
}
/*
* Can not trust the memory regions order that we read from
* device-tree. Hence, get the MAX end value.
*/
for (i = 0; i < memory_ranges; i++)
if (saved_max_mem < crash_memory_range[i].end)
saved_max_mem = crash_memory_range[i].end;
*range = crash_memory_range;
*ranges = memory_ranges;
#if DEBUG
int j;
printf("CRASH MEMORY RANGES\n");
for(j = 0; j < *ranges; j++) {
start = crash_memory_range[j].start;
end = crash_memory_range[j].end;
fprintf(stderr, "%016Lx-%016Lx\n", start, end);
}
#endif
return 0;
err:
if (crash_memory_range)
free(crash_memory_range);
return -1;
}
static int get_dyn_reconf_crash_memory_ranges(void)
{
uint64_t start, end;
uint64_t startrange, endrange;
uint64_t size;
char fname[128], buf[32];
FILE *file;
unsigned int i;
int n;
uint32_t flags;
strcpy(fname, "/proc/device-tree/");
strcat(fname, "ibm,dynamic-reconfiguration-memory/ibm,dynamic-memory");
if (is_dyn_mem_v2)
strcat(fname, "-v2");
if ((file = fopen(fname, "r")) == NULL) {
perror(fname);
return -1;
}
fseek(file, 4, SEEK_SET);
startrange = endrange = 0;
size = lmb_size;
for (i = 0; i < num_of_lmb_sets; i++) {
if ((n = fread(buf, 1, LMB_ENTRY_SIZE, file)) < 0) {
perror(fname);
fclose(file);
return -1;
}
if (memory_ranges >= (max_memory_ranges + 1)) {
/* No space to insert another element. */
fprintf(stderr,
"Error: Number of crash memory ranges"
" excedeed the max limit\n");
return -1;
}
/*
* If the property is ibm,dynamic-memory-v2, the first 4 bytes
* tell the number of sequential LMBs in this entry.
*/
if (is_dyn_mem_v2)
size = be32_to_cpu(((unsigned int *)buf)[0]) * lmb_size;
start = be64_to_cpu(*((uint64_t *)&buf[DRCONF_ADDR]));
end = start + size;
if (start == 0 && end >= (BACKUP_SRC_END + 1))
start = BACKUP_SRC_END + 1;
flags = be32_to_cpu((*((uint32_t *)&buf[DRCONF_FLAGS])));
/* skip this block if the reserved bit is set in flags (0x80)
or if the block is not assigned to this partition (0x8) */
if ((flags & 0x80) || !(flags & 0x8))
continue;
if (start != endrange) {
if (startrange != endrange)
exclude_crash_region(startrange, endrange);
startrange = start;
}
endrange = end;
}
if (startrange != endrange)
exclude_crash_region(startrange, endrange);
fclose(file);
return 0;
}