[PATCH] openrisc: Consolidate setup to use memblock instead of bootmem

From: Stafford Horne <shorne@gmail.com>
To: jonas@southpole.se, stefan.kristiansson@saunalahti.fi,
	openrisc@lists.librecores.org
Cc: linux-kernel@vger.kernel.org, Stafford Horne <shorne@gmail.com>
Subject: [PATCH] openrisc: Consolidate setup to use memblock instead of bootmem
Date: Wed,  6 Apr 2016 19:08:41 +0900	[thread overview]
Message-ID: <1459937321-22393-1-git-send-email-shorne@gmail.com> (raw)

Clearing out one todo item. This simplifies the boot process by using
the memblock api throughout the init process. 

The old logic bootstrapped from memblock -> bootmem -> buddy allocator
This is now simplified by using NO_BOOTMEM. 

Signed-off-by: Stafford Horne <shorne@gmail.com>

---
 arch/openrisc/Kconfig               |  1 +
 arch/openrisc/TODO.openrisc         |  3 ---
 arch/openrisc/include/asm/pgalloc.h |  1 -
 arch/openrisc/kernel/setup.c        | 34 ++++++++++++----------------------
 arch/openrisc/mm/init.c             |  2 +-
 arch/openrisc/mm/ioremap.c          |  4 ----
 6 files changed, 14 insertions(+), 31 deletions(-)

diff --git a/arch/openrisc/Kconfig b/arch/openrisc/Kconfig
index f1030d2..e760c83 100644
--- a/arch/openrisc/Kconfig
+++ b/arch/openrisc/Kconfig
@@ -27,6 +27,7 @@ config OPENRISC
 	select HAVE_DEBUG_STACKOVERFLOW
 	select OR1K_PIC
 	select OMPIC if SMP
+	select NO_BOOTMEM
 
 config MMU
 	def_bool y
diff --git a/arch/openrisc/TODO.openrisc b/arch/openrisc/TODO.openrisc
index a2bda7b..c43d4e1 100644
--- a/arch/openrisc/TODO.openrisc
+++ b/arch/openrisc/TODO.openrisc
@@ -5,9 +5,6 @@ that are due for investigation shortly, i.e. our TODO list:
 
 -- Implement the rest of the DMA API... dma_map_sg, etc.
 
--- Consolidate usage of memblock and bootmem... move everything over to
-   memblock.
-
 -- Finish the renaming cleanup... there are references to or32 in the code
    which was an older name for the architecture.  The name we've settled on is
    or1k and this change is slowly trickling through the stack.  For the time
diff --git a/arch/openrisc/include/asm/pgalloc.h b/arch/openrisc/include/asm/pgalloc.h
index 21484e5b..9c9f2ba 100644
--- a/arch/openrisc/include/asm/pgalloc.h
+++ b/arch/openrisc/include/asm/pgalloc.h
@@ -23,7 +23,6 @@
 #include <linux/threads.h>
 #include <linux/mm.h>
 #include <linux/memblock.h>
-#include <linux/bootmem.h>
 
 extern int mem_init_done;
 
diff --git a/arch/openrisc/kernel/setup.c b/arch/openrisc/kernel/setup.c
index 745ff14..60f784e 100644
--- a/arch/openrisc/kernel/setup.c
+++ b/arch/openrisc/kernel/setup.c
@@ -51,18 +51,16 @@
 
 #include "vmlinux.h"
 
-static unsigned long __init setup_memory(void)
+static void __init setup_memory(void)
 {
-	unsigned long bootmap_size;
 	unsigned long ram_start_pfn;
-	unsigned long free_ram_start_pfn;
 	unsigned long ram_end_pfn;
 	phys_addr_t memory_start, memory_end;
 	struct memblock_region *region;
 
 	memory_end = memory_start = 0;
 
-	/* Find main memory where is the kernel */
+	/* Find main memory where is the kernel, we assume its the only one */
 	for_each_memblock(memory, region) {
 		memory_start = region->base;
 		memory_end = region->base + region->size;
@@ -75,10 +73,11 @@ static unsigned long __init setup_memory(void)
 	}
 
 	ram_start_pfn = PFN_UP(memory_start);
-	/* free_ram_start_pfn is first page after kernel */
-	free_ram_start_pfn = PFN_UP(__pa(_end));
 	ram_end_pfn = PFN_DOWN(memblock_end_of_DRAM());
 
+	/* setup bootmem globals (we use no_bootmem, but mm still depends on this) */
+	min_low_pfn = ram_start_pfn;
+	max_low_pfn = ram_end_pfn;
 	max_pfn = ram_end_pfn;
 
 	/*
@@ -86,22 +85,13 @@ static unsigned long __init setup_memory(void)
 	 *
 	 * This makes the memory from the end of the kernel to the end of
 	 * RAM usable.
-	 * init_bootmem sets the global values min_low_pfn, max_low_pfn.
 	 */
-	bootmap_size = init_bootmem(free_ram_start_pfn,
-				    ram_end_pfn - ram_start_pfn);
-	free_bootmem(PFN_PHYS(free_ram_start_pfn),
-		     (ram_end_pfn - free_ram_start_pfn) << PAGE_SHIFT);
-	reserve_bootmem(PFN_PHYS(free_ram_start_pfn), bootmap_size,
-			BOOTMEM_DEFAULT);
-
-	for_each_memblock(reserved, region) {
-		printk(KERN_INFO "Reserved - 0x%08x-0x%08x\n",
-		       (u32) region->base, (u32) region->size);
-		reserve_bootmem(region->base, region->size, BOOTMEM_DEFAULT);
-	}
+	memblock_reserve(__pa(_stext), _end - _stext);
+
+	early_init_fdt_reserve_self();
+	early_init_fdt_scan_reserved_mem();
 
-	return ram_end_pfn;
+	memblock_dump_all();
 }
 
 struct cpuinfo_or1k cpuinfo_or1k[NR_CPUS];
@@ -327,8 +317,8 @@ void __init setup_arch(char **cmdline_p)
 	initrd_below_start_ok = 1;
 #endif
 
-	/* setup bootmem allocator */
-	max_low_pfn = setup_memory();
+	/* setup memblock allocator */
+	setup_memory();
 
 	/* paging_init() sets up the MMU and marks all pages as reserved */
 	paging_init();
diff --git a/arch/openrisc/mm/init.c b/arch/openrisc/mm/init.c
index f85b73d..6972d5d 100644
--- a/arch/openrisc/mm/init.c
+++ b/arch/openrisc/mm/init.c
@@ -106,7 +106,7 @@ static void __init map_ram(void)
 			}
 
 			/* Alloc one page for holding PTE's... */
-			pte = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE);
+			pte = (pte_t *) __va(memblock_alloc(PAGE_SIZE, PAGE_SIZE));
 			set_pmd(pme, __pmd(_KERNPG_TABLE + __pa(pte)));
 
 			/* Fill the newly allocated page with PTE'S */
diff --git a/arch/openrisc/mm/ioremap.c b/arch/openrisc/mm/ioremap.c
index 62b08ef..d11a594 100644
--- a/arch/openrisc/mm/ioremap.c
+++ b/arch/openrisc/mm/ioremap.c
@@ -124,11 +124,7 @@ pte_t __init_refok *pte_alloc_one_kernel(struct mm_struct *mm,
 	if (likely(mem_init_done)) {
 		pte = (pte_t *) __get_free_page(GFP_KERNEL | __GFP_REPEAT);
 	} else {
-		pte = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE);
-#if 0
-		/* FIXME: use memblock... */
 		pte = (pte_t *) __va(memblock_alloc(PAGE_SIZE, PAGE_SIZE));
-#endif
 	}
 
 	if (pte)
-- 
2.5.0
