ARM: initial LMB trial

Acked-by: Tony Lindgren <tony@atomide.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 45 insertions, 119 deletions

diff --git a/arch/arm/mm/init.c b/arch/arm/mm/init.c
index 1a227eea64b..4877e06308b 100644
--- a/arch/arm/mm/init.c
+++ b/arch/arm/mm/init.c
@@ -17,6 +17,7 @@
 #include <linux/initrd.h>
 #include <linux/highmem.h>
 #include <linux/gfp.h>
+#include <linux/memblock.h>
 
 #include <asm/mach-types.h>
 #include <asm/sections.h>
@@ -146,95 +147,21 @@ static void __init find_limits(struct meminfo *mi,
         }
 }
 
-/*
- * FIXME: We really want to avoid allocating the bootmap bitmap
- * over the top of the initrd.  Hopefully, this is located towards
- * the start of a bank, so if we allocate the bootmap bitmap at
- * the end, we won't clash.
- */
-static unsigned int __init
-find_bootmap_pfn(struct meminfo *mi, unsigned int bootmap_pages)
-{
-        unsigned int start_pfn, i, bootmap_pfn;
-
-        start_pfn   = PAGE_ALIGN(__pa(_end)) >> PAGE_SHIFT;
-        bootmap_pfn = 0;
-
-        for_each_bank(i, mi) {
-                struct membank *bank = &mi->bank[i];
-                unsigned int start, end;
-
-                start = bank_pfn_start(bank);
-                end   = bank_pfn_end(bank);
-
-                if (end < start_pfn)
-                        continue;
-
-                if (start < start_pfn)
-                        start = start_pfn;
-
-                if (end <= start)
-                        continue;
-
-                if (end - start >= bootmap_pages) {
-                        bootmap_pfn = start;
-                        break;
-                }
-        }
-
-        if (bootmap_pfn == 0)
-                BUG();
-
-        return bootmap_pfn;
-}
-
-static int __init check_initrd(struct meminfo *mi)
-{
-        int initrd = -2;
-#ifdef CONFIG_BLK_DEV_INITRD
-        unsigned long end = phys_initrd_start + phys_initrd_size;
-
-        /*
-         * Make sure that the initrd is within a valid area of
-         * memory.
-         */
-        if (phys_initrd_size) {
-                unsigned int i;
-
-                initrd = -1;
-
-                for (i = 0; i < mi->nr_banks; i++) {
-                        struct membank *bank = &mi->bank[i];
-                        if (bank_phys_start(bank) <= phys_initrd_start &&
-                            end <= bank_phys_end(bank))
-                                initrd = 0;
-                }
-        }
-
-        if (initrd == -1) {
-                printk(KERN_ERR "INITRD: 0x%08lx+0x%08lx extends beyond "
-                       "physical memory - disabling initrd\n",
-                       phys_initrd_start, phys_initrd_size);
-                phys_initrd_start = phys_initrd_size = 0;
-        }
-#endif
-
-        return initrd;
-}
-
 static void __init arm_bootmem_init(struct meminfo *mi,
         unsigned long start_pfn, unsigned long end_pfn)
 {
-        unsigned long boot_pfn;
         unsigned int boot_pages;
+        phys_addr_t bitmap;
         pg_data_t *pgdat;
         int i;
 
         /*
-         * Allocate the bootmem bitmap page.
+         * Allocate the bootmem bitmap page.  This must be in a region
+         * of memory which has already been mapped.
          */
         boot_pages = bootmem_bootmap_pages(end_pfn - start_pfn);
-        boot_pfn = find_bootmap_pfn(mi, boot_pages);
+        bitmap = memblock_alloc_base(boot_pages << PAGE_SHIFT, L1_CACHE_BYTES,
+                                __pfn_to_phys(end_pfn));
 
         /*
          * Initialise the bootmem allocator, handing the
@@ -242,7 +169,7 @@ static void __init arm_bootmem_init(struct meminfo *mi,
          */
         node_set_online(0);
         pgdat = NODE_DATA(0);
-        init_bootmem_node(pgdat, boot_pfn, start_pfn, end_pfn);
+        init_bootmem_node(pgdat, __phys_to_pfn(bitmap), start_pfn, end_pfn);
 
         for_each_bank(i, mi) {
                 struct membank *bank = &mi->bank[i];
@@ -251,30 +178,16 @@ static void __init arm_bootmem_init(struct meminfo *mi,
         }
 
         /*
-         * Reserve the bootmem bitmap.
+         * Reserve the memblock reserved regions in bootmem.
          */
-        reserve_bootmem(boot_pfn << PAGE_SHIFT,
-                        boot_pages << PAGE_SHIFT, BOOTMEM_DEFAULT);
-}
-
-static void __init bootmem_reserve_initrd(void)
-{
-#ifdef CONFIG_BLK_DEV_INITRD
-        int res;
-
-        res = reserve_bootmem(phys_initrd_start,
-                              phys_initrd_size, BOOTMEM_EXCLUSIVE);
-
-        if (res == 0) {
-                initrd_start = __phys_to_virt(phys_initrd_start);
-                initrd_end = initrd_start + phys_initrd_size;
-        } else {
-                printk(KERN_ERR
-                        "INITRD: 0x%08lx+0x%08lx overlaps in-use "
-                        "memory region - disabling initrd\n",
-                        phys_initrd_start, phys_initrd_size);
+        for (i = 0; i < memblock.reserved.cnt; i++) {
+                phys_addr_t start = memblock_start_pfn(&memblock.reserved, i);
+                if (start >= start_pfn &&
+                    memblock_end_pfn(&memblock.reserved, i) <= end_pfn)
+                        reserve_bootmem_node(pgdat, __pfn_to_phys(start),
+                                memblock_size_bytes(&memblock.reserved, i),
+                                BOOTMEM_DEFAULT);
         }
-#endif
 }
 
 static void __init arm_bootmem_free(struct meminfo *mi)
@@ -358,16 +271,40 @@ static void arm_memory_present(struct meminfo *mi)
 }
 #endif
 
+void __init arm_memblock_init(struct meminfo *mi)
+{
+        int i;
+
+        memblock_init();
+        for (i = 0; i < mi->nr_banks; i++)
+                memblock_add(mi->bank[i].start, mi->bank[i].size);
+
+        /* Register the kernel text, kernel data and initrd with memblock. */
+#ifdef CONFIG_XIP_KERNEL
+        memblock_reserve(__pa(_data), _end - _data);
+#else
+        memblock_reserve(__pa(_stext), _end - _stext);
+#endif
+#ifdef CONFIG_BLK_DEV_INITRD
+        if (phys_initrd_size) {
+                memblock_reserve(phys_initrd_start, phys_initrd_size);
+
+                /* Now convert initrd to virtual addresses */
+                initrd_start = __phys_to_virt(phys_initrd_start);
+                initrd_end = initrd_start + phys_initrd_size;
+        }
+#endif
+
+        arm_mm_memblock_reserve();
+
+        memblock_analyze();
+        memblock_dump_all();
+}
+
 void __init bootmem_init(struct machine_desc *mdesc)
 {
         struct meminfo *mi = &meminfo;
         unsigned long min, max_low, max_high;
-        int initrd;
-
-        /*
-         * Locate the ramdisk image, if any.
-         */
-        initrd = check_initrd(mi);
 
         max_low = max_high = 0;
 
@@ -375,21 +312,10 @@ void __init bootmem_init(struct machine_desc *mdesc)
 
         arm_bootmem_init(mi, min, max_low);
 
-        /*
-         * Reserve any special regions.
-         */
-        reserve_special_regions();
-
         if (mdesc->reserve)
                 mdesc->reserve();
 
         /*
-         * If the initrd is present, reserve its memory.
-         */
-        if (initrd == 0)
-                bootmem_reserve_initrd();
-
-        /*
          * Sparsemem tries to allocate bootmem in memory_present(),
          * so must be done after the fixed reservations
          */