Add the rt linux 4.1.3-rt3 as base

Import the rt linux 4.1.3-rt3 as OPNFV kvm base.

It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:

commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date:   Sat Jul 25 12:13:34 2015 +0200

    Prepare v4.1.3-rt3

    Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.

Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>

1 files changed, 321 insertions, 0 deletions

diff --git a/kernel/arch/alpha/mm/numa.c b/kernel/arch/alpha/mm/numa.c
new file mode 100644
index 000000000..d543d71c2
--- /dev/null
+++ b/kernel/arch/alpha/mm/numa.c
@@ -0,0 +1,321 @@
+/*
+ *  linux/arch/alpha/mm/numa.c
+ *
+ *  DISCONTIGMEM NUMA alpha support.
+ *
+ *  Copyright (C) 2001 Andrea Arcangeli <andrea@suse.de> SuSE
+ */
+
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/mm.h>
+#include <linux/bootmem.h>
+#include <linux/swap.h>
+#include <linux/initrd.h>
+#include <linux/pfn.h>
+#include <linux/module.h>
+
+#include <asm/hwrpb.h>
+#include <asm/pgalloc.h>
+#include <asm/sections.h>
+
+pg_data_t node_data[MAX_NUMNODES];
+EXPORT_SYMBOL(node_data);
+
+#undef DEBUG_DISCONTIG
+#ifdef DEBUG_DISCONTIG
+#define DBGDCONT(args...) printk(args)
+#else
+#define DBGDCONT(args...)
+#endif
+
+#define for_each_mem_cluster(memdesc, _cluster, i)		\
+	for ((_cluster) = (memdesc)->cluster, (i) = 0;		\
+	     (i) < (memdesc)->numclusters; (i)++, (_cluster)++)
+
+static void __init show_mem_layout(void)
+{
+	struct memclust_struct * cluster;
+	struct memdesc_struct * memdesc;
+	int i;
+
+	/* Find free clusters, and init and free the bootmem accordingly.  */
+	memdesc = (struct memdesc_struct *)
+	  (hwrpb->mddt_offset + (unsigned long) hwrpb);
+
+	printk("Raw memory layout:\n");
+	for_each_mem_cluster(memdesc, cluster, i) {
+		printk(" memcluster %2d, usage %1lx, start %8lu, end %8lu\n",
+		       i, cluster->usage, cluster->start_pfn,
+		       cluster->start_pfn + cluster->numpages);
+	}
+}
+
+static void __init
+setup_memory_node(int nid, void *kernel_end)
+{
+	extern unsigned long mem_size_limit;
+	struct memclust_struct * cluster;
+	struct memdesc_struct * memdesc;
+	unsigned long start_kernel_pfn, end_kernel_pfn;
+	unsigned long bootmap_size, bootmap_pages, bootmap_start;
+	unsigned long start, end;
+	unsigned long node_pfn_start, node_pfn_end;
+	unsigned long node_min_pfn, node_max_pfn;
+	int i;
+	unsigned long node_datasz = PFN_UP(sizeof(pg_data_t));
+	int show_init = 0;
+
+	/* Find the bounds of current node */
+	node_pfn_start = (node_mem_start(nid)) >> PAGE_SHIFT;
+	node_pfn_end = node_pfn_start + (node_mem_size(nid) >> PAGE_SHIFT);
+	
+	/* Find free clusters, and init and free the bootmem accordingly.  */
+	memdesc = (struct memdesc_struct *)
+	  (hwrpb->mddt_offset + (unsigned long) hwrpb);
+
+	/* find the bounds of this node (node_min_pfn/node_max_pfn) */
+	node_min_pfn = ~0UL;
+	node_max_pfn = 0UL;
+	for_each_mem_cluster(memdesc, cluster, i) {
+		/* Bit 0 is console/PALcode reserved.  Bit 1 is
+		   non-volatile memory -- we might want to mark
+		   this for later.  */
+		if (cluster->usage & 3)
+			continue;
+
+		start = cluster->start_pfn;
+		end = start + cluster->numpages;
+
+		if (start >= node_pfn_end || end <= node_pfn_start)
+			continue;
+
+		if (!show_init) {
+			show_init = 1;
+			printk("Initializing bootmem allocator on Node ID %d\n", nid);
+		}
+		printk(" memcluster %2d, usage %1lx, start %8lu, end %8lu\n",
+		       i, cluster->usage, cluster->start_pfn,
+		       cluster->start_pfn + cluster->numpages);
+
+		if (start < node_pfn_start)
+			start = node_pfn_start;
+		if (end > node_pfn_end)
+			end = node_pfn_end;
+
+		if (start < node_min_pfn)
+			node_min_pfn = start;
+		if (end > node_max_pfn)
+			node_max_pfn = end;
+	}
+
+	if (mem_size_limit && node_max_pfn > mem_size_limit) {
+		static int msg_shown = 0;
+		if (!msg_shown) {
+			msg_shown = 1;
+			printk("setup: forcing memory size to %ldK (from %ldK).\n",
+			       mem_size_limit << (PAGE_SHIFT - 10),
+			       node_max_pfn    << (PAGE_SHIFT - 10));
+		}
+		node_max_pfn = mem_size_limit;
+	}
+
+	if (node_min_pfn >= node_max_pfn)
+		return;
+
+	/* Update global {min,max}_low_pfn from node information. */
+	if (node_min_pfn < min_low_pfn)
+		min_low_pfn = node_min_pfn;
+	if (node_max_pfn > max_low_pfn)
+		max_pfn = max_low_pfn = node_max_pfn;
+
+#if 0 /* we'll try this one again in a little while */
+	/* Cute trick to make sure our local node data is on local memory */
+	node_data[nid] = (pg_data_t *)(__va(node_min_pfn << PAGE_SHIFT));
+#endif
+	/* Quasi-mark the pg_data_t as in-use */
+	node_min_pfn += node_datasz;
+	if (node_min_pfn >= node_max_pfn) {
+		printk(" not enough mem to reserve NODE_DATA");
+		return;
+	}
+	NODE_DATA(nid)->bdata = &bootmem_node_data[nid];
+
+	printk(" Detected node memory:   start %8lu, end %8lu\n",
+	       node_min_pfn, node_max_pfn);
+
+	DBGDCONT(" DISCONTIG: node_data[%d]   is at 0x%p\n", nid, NODE_DATA(nid));
+	DBGDCONT(" DISCONTIG: NODE_DATA(%d)->bdata is at 0x%p\n", nid, NODE_DATA(nid)->bdata);
+
+	/* Find the bounds of kernel memory.  */
+	start_kernel_pfn = PFN_DOWN(KERNEL_START_PHYS);
+	end_kernel_pfn = PFN_UP(virt_to_phys(kernel_end));
+	bootmap_start = -1;
+
+	if (!nid && (node_max_pfn < end_kernel_pfn || node_min_pfn > start_kernel_pfn))
+		panic("kernel loaded out of ram");
+
+	/* Zone start phys-addr must be 2^(MAX_ORDER-1) aligned.
+	   Note that we round this down, not up - node memory
+	   has much larger alignment than 8Mb, so it's safe. */
+	node_min_pfn &= ~((1UL << (MAX_ORDER-1))-1);
+
+	/* We need to know how many physically contiguous pages
+	   we'll need for the bootmap.  */
+	bootmap_pages = bootmem_bootmap_pages(node_max_pfn-node_min_pfn);
+
+	/* Now find a good region where to allocate the bootmap.  */
+	for_each_mem_cluster(memdesc, cluster, i) {
+		if (cluster->usage & 3)
+			continue;
+
+		start = cluster->start_pfn;
+		end = start + cluster->numpages;
+
+		if (start >= node_max_pfn || end <= node_min_pfn)
+			continue;
+
+		if (end > node_max_pfn)
+			end = node_max_pfn;
+		if (start < node_min_pfn)
+			start = node_min_pfn;
+
+		if (start < start_kernel_pfn) {
+			if (end > end_kernel_pfn
+			    && end - end_kernel_pfn >= bootmap_pages) {
+				bootmap_start = end_kernel_pfn;
+				break;
+			} else if (end > start_kernel_pfn)
+				end = start_kernel_pfn;
+		} else if (start < end_kernel_pfn)
+			start = end_kernel_pfn;
+		if (end - start >= bootmap_pages) {
+			bootmap_start = start;
+			break;
+		}
+	}
+
+	if (bootmap_start == -1)
+		panic("couldn't find a contiguous place for the bootmap");
+
+	/* Allocate the bootmap and mark the whole MM as reserved.  */
+	bootmap_size = init_bootmem_node(NODE_DATA(nid), bootmap_start,
+					 node_min_pfn, node_max_pfn);
+	DBGDCONT(" bootmap_start %lu, bootmap_size %lu, bootmap_pages %lu\n",
+		 bootmap_start, bootmap_size, bootmap_pages);
+
+	/* Mark the free regions.  */
+	for_each_mem_cluster(memdesc, cluster, i) {
+		if (cluster->usage & 3)
+			continue;
+
+		start = cluster->start_pfn;
+		end = cluster->start_pfn + cluster->numpages;
+
+		if (start >= node_max_pfn || end <= node_min_pfn)
+			continue;
+
+		if (end > node_max_pfn)
+			end = node_max_pfn;
+		if (start < node_min_pfn)
+			start = node_min_pfn;
+
+		if (start < start_kernel_pfn) {
+			if (end > end_kernel_pfn) {
+				free_bootmem_node(NODE_DATA(nid), PFN_PHYS(start),
+					     (PFN_PHYS(start_kernel_pfn)
+					      - PFN_PHYS(start)));
+				printk(" freeing pages %ld:%ld\n",
+				       start, start_kernel_pfn);
+				start = end_kernel_pfn;
+			} else if (end > start_kernel_pfn)
+				end = start_kernel_pfn;
+		} else if (start < end_kernel_pfn)
+			start = end_kernel_pfn;
+		if (start >= end)
+			continue;
+
+		free_bootmem_node(NODE_DATA(nid), PFN_PHYS(start), PFN_PHYS(end) - PFN_PHYS(start));
+		printk(" freeing pages %ld:%ld\n", start, end);
+	}
+
+	/* Reserve the bootmap memory.  */
+	reserve_bootmem_node(NODE_DATA(nid), PFN_PHYS(bootmap_start),
+			bootmap_size, BOOTMEM_DEFAULT);
+	printk(" reserving pages %ld:%ld\n", bootmap_start, bootmap_start+PFN_UP(bootmap_size));
+
+	node_set_online(nid);
+}
+
+void __init
+setup_memory(void *kernel_end)
+{
+	int nid;
+
+	show_mem_layout();
+
+	nodes_clear(node_online_map);
+
+	min_low_pfn = ~0UL;
+	max_low_pfn = 0UL;
+	for (nid = 0; nid < MAX_NUMNODES; nid++)
+		setup_memory_node(nid, kernel_end);
+
+#ifdef CONFIG_BLK_DEV_INITRD
+	initrd_start = INITRD_START;
+	if (initrd_start) {
+		extern void *move_initrd(unsigned long);
+
+		initrd_end = initrd_start+INITRD_SIZE;
+		printk("Initial ramdisk at: 0x%p (%lu bytes)\n",
+		       (void *) initrd_start, INITRD_SIZE);
+
+		if ((void *)initrd_end > phys_to_virt(PFN_PHYS(max_low_pfn))) {
+			if (!move_initrd(PFN_PHYS(max_low_pfn)))
+				printk("initrd extends beyond end of memory "
+				       "(0x%08lx > 0x%p)\ndisabling initrd\n",
+				       initrd_end,
+				       phys_to_virt(PFN_PHYS(max_low_pfn)));
+		} else {
+			nid = kvaddr_to_nid(initrd_start);
+			reserve_bootmem_node(NODE_DATA(nid),
+					     virt_to_phys((void *)initrd_start),
+					     INITRD_SIZE, BOOTMEM_DEFAULT);
+		}
+	}
+#endif /* CONFIG_BLK_DEV_INITRD */
+}
+
+void __init paging_init(void)
+{
+	unsigned int    nid;
+	unsigned long   zones_size[MAX_NR_ZONES] = {0, };
+	unsigned long	dma_local_pfn;
+
+	/*
+	 * The old global MAX_DMA_ADDRESS per-arch API doesn't fit
+	 * in the NUMA model, for now we convert it to a pfn and
+	 * we interpret this pfn as a local per-node information.
+	 * This issue isn't very important since none of these machines
+	 * have legacy ISA slots anyways.
+	 */
+	dma_local_pfn = virt_to_phys((char *)MAX_DMA_ADDRESS) >> PAGE_SHIFT;
+
+	for_each_online_node(nid) {
+		bootmem_data_t *bdata = &bootmem_node_data[nid];
+		unsigned long start_pfn = bdata->node_min_pfn;
+		unsigned long end_pfn = bdata->node_low_pfn;
+
+		if (dma_local_pfn >= end_pfn - start_pfn)
+			zones_size[ZONE_DMA] = end_pfn - start_pfn;
+		else {
+			zones_size[ZONE_DMA] = dma_local_pfn;
+			zones_size[ZONE_NORMAL] = (end_pfn - start_pfn) - dma_local_pfn;
+		}
+		node_set_state(nid, N_NORMAL_MEMORY);
+		free_area_init_node(nid, zones_size, start_pfn, NULL);
+	}
+
+	/* Initialize the kernel's ZERO_PGE. */
+	memset((void *)ZERO_PGE, 0, PAGE_SIZE);
+}