Here is a set of ppc64 specific patches that at least allow
compilation/booting with the following configurations:
FLATMEM
SPARSEMEN
SPARSEMEM + MEMORY_HOTPLUG
Signed-off-by: Mike Kravetz <[email protected]>
Signed-off-by: Dave Hansen <[email protected]>
---
include/asm-ppc64/mmzone.h | 0
memhotplug-dave/arch/ppc64/mm/init.c | 77 +++++++++++++++++++++++++++
memhotplug-dave/include/asm-ppc64/abs_addr.h | 2
3 files changed, 79 insertions(+)
diff -puN arch/ppc64/mm/init.c~D2-ppc64-hotplug-functions arch/ppc64/mm/init.c
--- memhotplug/arch/ppc64/mm/init.c~D2-ppc64-hotplug-functions 2005-08-12 07:43:51.000000000 -0700
+++ memhotplug-dave/arch/ppc64/mm/init.c 2005-08-12 07:43:51.000000000 -0700
@@ -870,3 +870,80 @@ pgprot_t phys_mem_access_prot(struct fil
return vma_prot;
}
EXPORT_SYMBOL(phys_mem_access_prot);
+
+#ifdef CONFIG_MEMORY_HOTPLUG
+
+void online_page(struct page *page)
+{
+ ClearPageReserved(page);
+ free_cold_page(page);
+ totalram_pages++;
+ num_physpages++;
+}
+
+/*
+ * This works only for the non-NUMA case. Later, we'll need a lookup
+ * to convert from real physical addresses to nid, that doesn't use
+ * pfn_to_nid().
+ */
+int __devinit add_memory(u64 start, u64 size)
+{
+ struct pglist_data *pgdata = NODE_DATA(0);
+ struct zone *zone;
+ unsigned long start_pfn = start >> PAGE_SHIFT;
+ unsigned long nr_pages = size >> PAGE_SHIFT;
+
+ /* this should work for most non-highmem platforms */
+ zone = pgdata->node_zones;
+
+ return __add_pages(zone, start_pfn, nr_pages);
+
+ return 0;
+}
+
+/*
+ * First pass at this code will check to determine if the remove
+ * request is within the RMO. Do not allow removal within the RMO.
+ */
+int __devinit remove_memory(u64 start, u64 size)
+{
+ struct zone *zone;
+ unsigned long start_pfn, end_pfn, nr_pages;
+
+ start_pfn = start >> PAGE_SHIFT;
+ nr_pages = size >> PAGE_SHIFT;
+ end_pfn = start_pfn + nr_pages;
+
+ printk("%s(): Attempting to remove memoy in range "
+ "%lx to %lx\n", __func__, start, start+size);
+ /*
+ * check for range within RMO
+ */
+ zone = page_zone(pfn_to_page(start_pfn));
+
+ printk("%s(): memory will be removed from "
+ "the %s zone\n", __func__, zone->name);
+
+ /*
+ * not handling removing memory ranges that
+ * overlap multiple zones yet
+ */
+ if (end_pfn > (zone->zone_start_pfn + zone->spanned_pages))
+ goto overlap;
+
+ /* make sure it is NOT in RMO */
+ if ((start < lmb.rmo_size) || ((start+size) < lmb.rmo_size)) {
+ printk("%s(): range to be removed must NOT be in RMO!\n",
+ __func__);
+ goto in_rmo;
+ }
+
+ return __remove_pages(zone, start_pfn, nr_pages);
+
+overlap:
+ printk("%s(): memory range to be removed overlaps "
+ "multiple zones!!!\n", __func__);
+in_rmo:
+ return -1;
+}
+#endif /* CONFIG_MEMORY_HOTPLUG */
diff -puN include/asm-ppc64/abs_addr.h~D2-ppc64-hotplug-functions include/asm-ppc64/abs_addr.h
--- memhotplug/include/asm-ppc64/abs_addr.h~D2-ppc64-hotplug-functions 2005-08-12 07:43:51.000000000 -0700
+++ memhotplug-dave/include/asm-ppc64/abs_addr.h 2005-08-12 07:43:51.000000000 -0700
@@ -104,5 +104,7 @@ physRpn_to_absRpn(unsigned long rpn)
/* Convenience macros */
#define virt_to_abs(va) phys_to_abs(__pa(va))
#define abs_to_virt(aa) __va(abs_to_phys(aa))
+#define boot_virt_to_abs(va) phys_to_abs(__boot_pa(va))
+#define boot_abs_to_virt(aa) __boot_va(abs_to_phys(aa))
#endif /* _ABS_ADDR_H */
diff -puN include/asm-ppc64/mmzone.h~D2-ppc64-hotplug-functions include/asm-ppc64/mmzone.h
_
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