Pull new-efi-memmap into release branch

4 files changed, 370 insertions, 193 deletions

diff --git a/arch/ia64/kernel/efi.c b/arch/ia64/kernel/efi.c
index 179f230816ed..f72ea6aebcb1 100644
--- a/arch/ia64/kernel/efi.c
+++ b/arch/ia64/kernel/efi.c
@@ -239,57 +239,30 @@ is_available_memory (efi_memory_desc_t *md)
         return 0;
 }
 
-/*
- * Trim descriptor MD so its starts at address START_ADDR.  If the descriptor covers
- * memory that is normally available to the kernel, issue a warning that some memory
- * is being ignored.
- */
-static void
-trim_bottom (efi_memory_desc_t *md, u64 start_addr)
-{
-        u64 num_skipped_pages;
+typedef struct kern_memdesc {
+        u64 attribute;
+        u64 start;
+        u64 num_pages;
+} kern_memdesc_t;
 
-        if (md->phys_addr >= start_addr || !md->num_pages)
-                return;
-
-        num_skipped_pages = (start_addr - md->phys_addr) >> EFI_PAGE_SHIFT;
-        if (num_skipped_pages > md->num_pages)
-                num_skipped_pages = md->num_pages;
-
-        if (is_available_memory(md))
-                printk(KERN_NOTICE "efi.%s: ignoring %luKB of memory at 0x%lx due to granule hole "
-                       "at 0x%lx\n", __FUNCTION__,
-                       (num_skipped_pages << EFI_PAGE_SHIFT) >> 10,
-                       md->phys_addr, start_addr - IA64_GRANULE_SIZE);
-        /*
-         * NOTE: Don't set md->phys_addr to START_ADDR because that could cause the memory
-         * descriptor list to become unsorted.  In such a case, md->num_pages will be
-         * zero, so the Right Thing will happen.
-         */
-        md->phys_addr += num_skipped_pages << EFI_PAGE_SHIFT;
-        md->num_pages -= num_skipped_pages;
-}
+static kern_memdesc_t *kern_memmap;
 
 static void
-trim_top (efi_memory_desc_t *md, u64 end_addr)
+walk (efi_freemem_callback_t callback, void *arg, u64 attr)
 {
-        u64 num_dropped_pages, md_end_addr;
-
-        md_end_addr = md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT);
-
-        if (md_end_addr <= end_addr || !md->num_pages)
-                return;
+        kern_memdesc_t *k;
+        u64 start, end, voff;
 
-        num_dropped_pages = (md_end_addr - end_addr) >> EFI_PAGE_SHIFT;
-        if (num_dropped_pages > md->num_pages)
-                num_dropped_pages = md->num_pages;
-
-        if (is_available_memory(md))
-                printk(KERN_NOTICE "efi.%s: ignoring %luKB of memory at 0x%lx due to granule hole "
-                       "at 0x%lx\n", __FUNCTION__,
-                       (num_dropped_pages << EFI_PAGE_SHIFT) >> 10,
-                       md->phys_addr, end_addr);
-        md->num_pages -= num_dropped_pages;
+        voff = (attr == EFI_MEMORY_WB) ? PAGE_OFFSET : __IA64_UNCACHED_OFFSET;
+        for (k = kern_memmap; k->start != ~0UL; k++) {
+                if (k->attribute != attr)
+                        continue;
+                start = PAGE_ALIGN(k->start);
+                end = (k->start + (k->num_pages << EFI_PAGE_SHIFT)) & PAGE_MASK;
+                if (start < end)
+                        if ((*callback)(start + voff, end + voff, arg) < 0)
+                                return;
+        }
 }
 
 /*
@@ -299,148 +272,19 @@ trim_top (efi_memory_desc_t *md, u64 end_addr)
 void
 efi_memmap_walk (efi_freemem_callback_t callback, void *arg)
 {
-        int prev_valid = 0;
-        struct range {
-                u64 start;
-                u64 end;
-        } prev, curr;
-        void *efi_map_start, *efi_map_end, *p, *q;
-        efi_memory_desc_t *md, *check_md;
-        u64 efi_desc_size, start, end, granule_addr, last_granule_addr, first_non_wb_addr = 0;
-        unsigned long total_mem = 0;
-
-        efi_map_start = __va(ia64_boot_param->efi_memmap);
-        efi_map_end   = efi_map_start + ia64_boot_param->efi_memmap_size;
-        efi_desc_size = ia64_boot_param->efi_memdesc_size;
-
-        for (p = efi_map_start; p < efi_map_end; p += efi_desc_size) {
-                md = p;
-
-                /* skip over non-WB memory descriptors; that's all we're interested in... */
-                if (!(md->attribute & EFI_MEMORY_WB))
-                        continue;
-
-                /*
-                 * granule_addr is the base of md's first granule.
-                 * [granule_addr - first_non_wb_addr) is guaranteed to
-                 * be contiguous WB memory.
-                 */
-                granule_addr = GRANULEROUNDDOWN(md->phys_addr);
-                first_non_wb_addr = max(first_non_wb_addr, granule_addr);
-
-                if (first_non_wb_addr < md->phys_addr) {
-                        trim_bottom(md, granule_addr + IA64_GRANULE_SIZE);
-                        granule_addr = GRANULEROUNDDOWN(md->phys_addr);
-                        first_non_wb_addr = max(first_non_wb_addr, granule_addr);
-                }
-
-                for (q = p; q < efi_map_end; q += efi_desc_size) {
-                        check_md = q;
-
-                        if ((check_md->attribute & EFI_MEMORY_WB) &&
-                            (check_md->phys_addr == first_non_wb_addr))
-                                first_non_wb_addr += check_md->num_pages << EFI_PAGE_SHIFT;
-                        else
-                                break;          /* non-WB or hole */
-                }
-
-                last_granule_addr = GRANULEROUNDDOWN(first_non_wb_addr);
-                if (last_granule_addr < md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT))
-                        trim_top(md, last_granule_addr);
-
-                if (is_available_memory(md)) {
-                        if (md->phys_addr + (md->num_pages << EFI_PAGE_SHIFT) >= max_addr) {
-                                if (md->phys_addr >= max_addr)
-                                        continue;
-                                md->num_pages = (max_addr - md->phys_addr) >> EFI_PAGE_SHIFT;
-                                first_non_wb_addr = max_addr;
-                        }
-
-                        if (total_mem >= mem_limit)
-                                continue;
-
-                        if (total_mem + (md->num_pages << EFI_PAGE_SHIFT) > mem_limit) {
-                                unsigned long limit_addr = md->phys_addr;
-
-                                limit_addr += mem_limit - total_mem;
-                                limit_addr = GRANULEROUNDDOWN(limit_addr);
-
-                                if (md->phys_addr > limit_addr)
-                                        continue;
-
-                                md->num_pages = (limit_addr - md->phys_addr) >>
-                                                EFI_PAGE_SHIFT;
-                                first_non_wb_addr = max_addr = md->phys_addr +
-                                              (md->num_pages << EFI_PAGE_SHIFT);
-                        }
-                        total_mem += (md->num_pages << EFI_PAGE_SHIFT);
-
-                        if (md->num_pages == 0)
-                                continue;
-
-                        curr.start = PAGE_OFFSET + md->phys_addr;
-                        curr.end   = curr.start + (md->num_pages << EFI_PAGE_SHIFT);
-
-                        if (!prev_valid) {
-                                prev = curr;
-                                prev_valid = 1;
-                        } else {
-                                if (curr.start < prev.start)
-                                        printk(KERN_ERR "Oops: EFI memory table not ordered!\n");
-
-                                if (prev.end == curr.start) {
-                                        /* merge two consecutive memory ranges */
-                                        prev.end = curr.end;
-                                } else {
-                                        start = PAGE_ALIGN(prev.start);
+        walk(callback, arg, EFI_MEMORY_WB);