These changes are the raw update to linux-4.4.6-rt14. Kernel sources

[kvmfornfv.git] / kernel / arch / x86 / kernel / e820.c

diff --git a/kernel/arch/x86/kernel/e820.c b/kernel/arch/x86/kernel/e820.c
index e2ce85d..569c1e4 100644 (file)
--- a/kernel/arch/x86/kernel/e820.c
+++ b/kernel/arch/x86/kernel/e820.c
@@ -149,6 +149,7 @@ static void __init e820_print_type(u32 type)
        case E820_UNUSABLE:
                printk(KERN_CONT "unusable");
                break;
+       case E820_PMEM:
        case E820_PRAM:
                printk(KERN_CONT "persistent (type %u)", type);
                break;
@@ -910,7 +911,7 @@ void __init finish_e820_parsing(void)
        }
 }
 
-static inline const char *e820_type_to_string(int e820_type)
+static const char *e820_type_to_string(int e820_type)
 {
        switch (e820_type) {
        case E820_RESERVED_KERN:
@@ -918,11 +919,32 @@ static inline const char *e820_type_to_string(int e820_type)
        case E820_ACPI: return "ACPI Tables";
        case E820_NVS:  return "ACPI Non-volatile Storage";
        case E820_UNUSABLE:     return "Unusable memory";
-       case E820_PRAM: return "Persistent RAM";
+       case E820_PRAM: return "Persistent Memory (legacy)";
+       case E820_PMEM: return "Persistent Memory";
        default:        return "reserved";
        }
 }
 
+static bool do_mark_busy(u32 type, struct resource *res)
+{
+       /* this is the legacy bios/dos rom-shadow + mmio region */
+       if (res->start < (1ULL<<20))
+               return true;
+
+       /*
+        * Treat persistent memory like device memory, i.e. reserve it
+        * for exclusive use of a driver
+        */
+       switch (type) {
+       case E820_RESERVED:
+       case E820_PRAM:
+       case E820_PMEM:
+               return false;
+       default:
+               return true;
+       }
+}
+
 /*
  * Mark e820 reserved areas as busy for the resource manager.
  */
@@ -952,9 +974,7 @@ void __init e820_reserve_resources(void)
                 * pci device BAR resource and insert them later in
                 * pcibios_resource_survey()
                 */
-               if (((e820.map[i].type != E820_RESERVED) &&
-                    (e820.map[i].type != E820_PRAM)) ||
-                    res->start < (1ULL<<20)) {
+               if (do_mark_busy(e820.map[i].type, res)) {
                        res->flags |= IORESOURCE_BUSY;
                        insert_resource(&iomem_resource, res);
                }
@@ -1123,7 +1143,8 @@ void __init memblock_find_dma_reserve(void)
                nr_pages += end_pfn - start_pfn;
        }
 
-       for_each_free_mem_range(u, NUMA_NO_NODE, &start, &end, NULL) {
+       for_each_free_mem_range(u, NUMA_NO_NODE, MEMBLOCK_NONE, &start, &end,
+                               NULL) {
                start_pfn = min_t(unsigned long, PFN_UP(start), MAX_DMA_PFN);
                end_pfn = min_t(unsigned long, PFN_DOWN(end), MAX_DMA_PFN);
                if (start_pfn < end_pfn)