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authorDavid Daney <ddaney@caviumnetworks.com>2011-11-22 14:38:03 +0000
committerRalf Baechle <ralf@linux-mips.org>2011-12-07 22:03:45 +0000
commit43064c0c8ee2ada8edd421520c633584d648e100 (patch)
tree3621ac70a6d96a872942c205f03f9fda18826588 /arch/mips/kernel/setup.c
parentb1c10bea620f79109b5cc9935267bea4f6f29ac6 (diff)
MIPS: Handle initmem in systems with kernel not in add_memory_region() mem
This patch addresses a couple of related problems: 1) The kernel may reside in physical memory outside of the ranges set by plat_mem_setup(). If this is the case, init mem cannot be reused as it resides outside of the range of pages that the kernel memory allocators control. 2) initrd images might be loaded in physical memory outside of the ranges set by plat_mem_setup(). The memory likewise cannot be reused. The patch doesn't handle this specific case, but the infrastructure is useful for future patches that do. The crux of the problem is that there are memory regions that need be memory_present(), but that cannot be free_bootmem() at the time of arch_mem_init(). We create a new type of memory (BOOT_MEM_INIT_RAM) for use with add_memory_region(). Then arch_mem_init() adds the init mem with this type if the init mem is not already covered by existing ranges. When memory is being freed into the bootmem allocator, we skip the BOOT_MEM_INIT_RAM ranges so they are not clobbered, but we do signal them as memory_present(). This way when they are later freed, the necessary memory manager structures have initialized and the Sparse allocater is prevented from crashing. The Octeon specific code that handled this case is removed, because the new general purpose code handles the case. Signed-off-by: David Daney <ddaney@caviumnetworks.com> To: linux-mips@linux-mips.org Patchwork: https://patchwork.linux-mips.org/patch/1988/ Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
Diffstat (limited to 'arch/mips/kernel/setup.c')
-rw-r--r--arch/mips/kernel/setup.c43
1 files changed, 39 insertions, 4 deletions
diff --git a/arch/mips/kernel/setup.c b/arch/mips/kernel/setup.c
index 84af26ab2212..e86c2cf554aa 100644
--- a/arch/mips/kernel/setup.c
+++ b/arch/mips/kernel/setup.c
@@ -121,6 +121,9 @@ static void __init print_memory_map(void)
case BOOT_MEM_RAM:
printk(KERN_CONT "(usable)\n");
break;
+ case BOOT_MEM_INIT_RAM:
+ printk(KERN_CONT "(usable after init)\n");
+ break;
case BOOT_MEM_ROM_DATA:
printk(KERN_CONT "(ROM data)\n");
break;
@@ -361,15 +364,24 @@ static void __init bootmem_init(void)
for (i = 0; i < boot_mem_map.nr_map; i++) {
unsigned long start, end, size;
+ start = PFN_UP(boot_mem_map.map[i].addr);
+ end = PFN_DOWN(boot_mem_map.map[i].addr
+ + boot_mem_map.map[i].size);
+
/*
* Reserve usable memory.
*/
- if (boot_mem_map.map[i].type != BOOT_MEM_RAM)
+ switch (boot_mem_map.map[i].type) {
+ case BOOT_MEM_RAM:
+ break;
+ case BOOT_MEM_INIT_RAM:
+ memory_present(0, start, end);
continue;
+ default:
+ /* Not usable memory */
+ continue;
+ }
- start = PFN_UP(boot_mem_map.map[i].addr);
- end = PFN_DOWN(boot_mem_map.map[i].addr
- + boot_mem_map.map[i].size);
/*
* We are rounding up the start address of usable memory
* and at the end of the usable range downwards.
@@ -455,11 +467,33 @@ early_param("mem", early_parse_mem);
static void __init arch_mem_init(char **cmdline_p)
{
+ phys_t init_mem, init_end, init_size;
+
extern void plat_mem_setup(void);
/* call board setup routine */
plat_mem_setup();
+ init_mem = PFN_UP(__pa_symbol(&__init_begin)) << PAGE_SHIFT;
+ init_end = PFN_DOWN(__pa_symbol(&__init_end)) << PAGE_SHIFT;
+ init_size = init_end - init_mem;
+ if (init_size) {
+ /* Make sure it is in the boot_mem_map */
+ int i, found;
+ found = 0;
+ for (i = 0; i < boot_mem_map.nr_map; i++) {
+ if (init_mem >= boot_mem_map.map[i].addr &&
+ init_mem < (boot_mem_map.map[i].addr +
+ boot_mem_map.map[i].size)) {
+ found = 1;
+ break;
+ }
+ }
+ if (!found)
+ add_memory_region(init_mem, init_size,
+ BOOT_MEM_INIT_RAM);
+ }
+
pr_info("Determined physical RAM map:\n");
print_memory_map();
@@ -523,6 +557,7 @@ static void __init resource_init(void)
res = alloc_bootmem(sizeof(struct resource));
switch (boot_mem_map.map[i].type) {
case BOOT_MEM_RAM:
+ case BOOT_MEM_INIT_RAM:
case BOOT_MEM_ROM_DATA:
res->name = "System RAM";
break;