s390/mem_detect: move tprot loop to early boot phase

Move memory detection to early boot phase. To store online memory
regions "struct mem_detect_info" has been introduced together with
for_each_mem_detect_block iterator. mem_detect_info is later converted
to memblock.

Also introduces sclp_early_get_meminfo function to get maximum physical
memory and maximum increment number.

Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Reviewed-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

2 files changed, 1 insertions, 64 deletions

diff --git a/arch/s390/mm/Makefile b/arch/s390/mm/Makefile
index 33fe418506bc..83c83c69cab2 100644
--- a/arch/s390/mm/Makefile
+++ b/arch/s390/mm/Makefile
@@ -4,8 +4,7 @@
 #
 
 obj-y		:= init.o fault.o extmem.o mmap.o vmem.o maccess.o
-obj-y		+= page-states.o gup.o pageattr.o mem_detect.o
-obj-y		+= pgtable.o pgalloc.o
+obj-y		+= page-states.o gup.o pageattr.o pgtable.o pgalloc.o
 
 obj-$(CONFIG_CMM)		+= cmm.o
 obj-$(CONFIG_HUGETLB_PAGE)	+= hugetlbpage.o
diff --git a/arch/s390/mm/mem_detect.c b/arch/s390/mm/mem_detect.c
deleted file mode 100644
index 21f6c82c8296..000000000000
--- a/arch/s390/mm/mem_detect.c
+++ /dev/null
@@ -1,62 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * Copyright IBM Corp. 2008, 2009
- *
- * Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>
- */
-
-#include <linux/kernel.h>
-#include <linux/memblock.h>
-#include <linux/init.h>
-#include <linux/debugfs.h>
-#include <linux/seq_file.h>
-#include <asm/ipl.h>
-#include <asm/sclp.h>
-#include <asm/setup.h>
-
-#define CHUNK_READ_WRITE 0
-#define CHUNK_READ_ONLY  1
-
-static inline void memblock_physmem_add(phys_addr_t start, phys_addr_t size)
-{
-	memblock_dbg("memblock_physmem_add: [%#016llx-%#016llx]\n",
-		     start, start + size - 1);
-	memblock_add_range(&memblock.memory, start, size, 0, 0);
-	memblock_add_range(&memblock.physmem, start, size, 0, 0);
-}
-
-void __init detect_memory_memblock(void)
-{
-	unsigned long memsize, rnmax, rzm, addr, size;
-	int type;
-
-	rzm = sclp.rzm;
-	rnmax = sclp.rnmax;
-	memsize = rzm * rnmax;
-	if (!rzm)
-		rzm = 1UL << 17;
-	max_physmem_end = memsize;
-	addr = 0;
-	/* keep memblock lists close to the kernel */
-	memblock_set_bottom_up(true);
-	do {
-		size = 0;
-		/* assume lowcore is writable */
-		type = addr ? tprot(addr) : CHUNK_READ_WRITE;
-		do {
-			size += rzm;
-			if (max_physmem_end && addr + size >= max_physmem_end)
-				break;
-		} while (type == tprot(addr + size));
-		if (type == CHUNK_READ_WRITE || type == CHUNK_READ_ONLY) {
-			if (max_physmem_end && (addr + size > max_physmem_end))
-				size = max_physmem_end - addr;
-			memblock_physmem_add(addr, size);
-		}
-		addr += size;
-	} while (addr < max_physmem_end);
-	memblock_set_bottom_up(false);
-	if (!max_physmem_end)
-		max_physmem_end = memblock_end_of_DRAM();
-	memblock_dump_all();
-}