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Commit c039e3a8 authored by Benjamin Herrenschmidt's avatar Benjamin Herrenschmidt
Browse files

powerpc: Handle both new style and old style reserve maps 



When Jeremy introduced the new device-tree based reserve map, he made
the code in early_reserve_mem_dt() bail out if it found one, thus not
reserving the initrd nor processing the old style map.

I hit problems with variants of kexec that didn't put the initrd in
the new style map either. While these could/will be fixed, I believe
we should be safe here and rather reserve more than not enough.

We could have a firmware passing stuff via the new style map, and
in the middle, a kexec that knows nothing about it and adding other
things to the old style map.

I don't see a big issue with processing both and reserving everything
that needs to be. memblock_reserve() supports overlaps fine these days.

Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
parent e2a800be

arch/powerpc/kernel/prom.c

+17 −14
Original line number Diff line number Diff line
@@ -559,7 +559,7 @@ void __init early_init_dt_setup_initrd_arch(unsigned long start, 
}

#endif



static bool __init early_reserve_mem_dt(void)

static void __init early_reserve_mem_dt(void)

{

	unsigned long i, len, dt_root;

	const __be32 *prop;
@@ -569,7 +569,9 @@ static bool __init early_reserve_mem_dt(void) 
	prop = of_get_flat_dt_prop(dt_root, "reserved-ranges", &len);



	if (!prop)

		return false;

		return;



	DBG("Found new-style reserved-ranges\n");



	/* Each reserved range is an (address,size) pair, 2 cells each,

	 * totalling 4 cells per range. */
@@ -579,11 +581,11 @@ static bool __init early_reserve_mem_dt(void) 
		base = of_read_number(prop + (i * 4) + 0, 2);

		size = of_read_number(prop + (i * 4) + 2, 2);



		if (size)

		if (size) {

			DBG("reserving: %llx -> %llx\n", base, size);

			memblock_reserve(base, size);

		}



	return true;

	}

}



static void __init early_reserve_mem(void)
@@ -601,20 +603,16 @@ static void __init early_reserve_mem(void) 
	self_size = initial_boot_params->totalsize;

	memblock_reserve(self_base, self_size);



	/*

	 * Try looking for reserved-regions property in the DT first; if

	 * it's present, it'll contain all of the necessary reservation

	 * info

	 */

	if (early_reserve_mem_dt())

		return;

	/* Look for the new "reserved-regions" property in the DT */

	early_reserve_mem_dt();



#ifdef CONFIG_BLK_DEV_INITRD

	/* then reserve the initrd, if any */

	if (initrd_start && (initrd_end > initrd_start))

	/* Then reserve the initrd, if any */

	if (initrd_start && (initrd_end > initrd_start)) {

		memblock_reserve(_ALIGN_DOWN(__pa(initrd_start), PAGE_SIZE),

			_ALIGN_UP(initrd_end, PAGE_SIZE) -

			_ALIGN_DOWN(initrd_start, PAGE_SIZE));

	}

#endif /* CONFIG_BLK_DEV_INITRD */



#ifdef CONFIG_PPC32
@@ -626,6 +624,8 @@ static void __init early_reserve_mem(void) 
		u32 base_32, size_32;

		u32 *reserve_map_32 = (u32 *)reserve_map;



		DBG("Found old 32-bit reserve map\n");



		while (1) {

			base_32 = *(reserve_map_32++);

			size_32 = *(reserve_map_32++);
@@ -640,6 +640,9 @@ static void __init early_reserve_mem(void) 
		return;

	}

#endif

	DBG("Processing reserve map\n");



	/* Handle the reserve map in the fdt blob if it exists */

	while (1) {

		base = *(reserve_map++);

		size = *(reserve_map++);