patch-2.4.20 linux-2.4.20/arch/mips/sgi-ip27/ip27-klnuma.c

• Lines: 144
• Date: Thu Nov 28 15:53:10 2002
• Orig file: linux-2.4.19/arch/mips/sgi-ip27/ip27-klnuma.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -urN linux-2.4.19/arch/mips/sgi-ip27/ip27-klnuma.c linux-2.4.20/arch/mips/sgi-ip27/ip27-klnuma.c
@@ -0,0 +1,143 @@
+/*
+ * Ported from IRIX to Linux by Kanoj Sarcar, 06/08/00.
+ * Copyright 2000 - 2001 Silicon Graphics, Inc.
+ * Copyright 2000 - 2001 Kanoj Sarcar (kanoj@sgi.com)
+ */
+#include <linux/config.h>
+#include <linux/init.h>
+#include <linux/mmzone.h>
+#include <linux/kernel.h>
+#include <linux/string.h>
+
+#include <asm/page.h>
+#include <asm/smp.h>
+#include <asm/sn/types.h>
+#include <asm/sn/arch.h>
+#include <asm/sn/gda.h>
+#include <asm/mmzone.h>
+#include <asm/sn/klkernvars.h>
+#include <asm/sn/mapped_kernel.h>
+#include <asm/sn/sn_private.h>
+
+extern char _end;
+static cpumask_t ktext_repmask;
+
+/*
+ * XXX - This needs to be much smarter about where it puts copies of the
+ * kernel.  For example, we should never put a copy on a headless node,
+ * and we should respect the topology of the machine.
+ */
+void __init setup_replication_mask(int maxnodes)
+{
+	static int 	numa_kernel_replication_ratio;
+	cnodeid_t	cnode;
+
+	/* Set only the master cnode's bit.  The master cnode is always 0. */
+	CPUMASK_CLRALL(ktext_repmask);
+	CPUMASK_SETB(ktext_repmask, 0);
+
+	numa_kernel_replication_ratio = 0;
+#ifdef CONFIG_REPLICATE_KTEXT
+#ifndef CONFIG_MAPPED_KERNEL
+#error Kernel replication works with mapped kernel support. No calias support.
+#endif
+	numa_kernel_replication_ratio = 1;
+#endif
+
+	for (cnode = 1; cnode < numnodes; cnode++) {
+		/* See if this node should get a copy of the kernel */
+		if (numa_kernel_replication_ratio &&
+		    !(cnode % numa_kernel_replication_ratio)) {
+
+			/* Advertise that we have a copy of the kernel */
+			CPUMASK_SETB(ktext_repmask, cnode);
+		}
+	}
+
+	/* Set up a GDA pointer to the replication mask. */
+	GDA->g_ktext_repmask = &ktext_repmask;
+}
+
+
+static __init void set_ktext_source(nasid_t client_nasid, nasid_t server_nasid)
+{
+	kern_vars_t *kvp;
+	cnodeid_t client_cnode;
+
+	client_cnode = NASID_TO_COMPACT_NODEID(client_nasid);
+
+	kvp = &(PLAT_NODE_DATA(client_cnode)->kern_vars);
+
+	KERN_VARS_ADDR(client_nasid) = (unsigned long)kvp;
+
+	kvp->kv_magic = KV_MAGIC;
+
+	kvp->kv_ro_nasid = server_nasid;
+	kvp->kv_rw_nasid = master_nasid;
+	kvp->kv_ro_baseaddr = NODE_CAC_BASE(server_nasid);
+	kvp->kv_rw_baseaddr = NODE_CAC_BASE(master_nasid);
+	printk("REPLICATION: ON nasid %d, ktext from nasid %d, kdata from nasid %d\n", client_nasid, server_nasid, master_nasid);
+}
+
+/* XXX - When the BTE works, we should use it instead of this. */
+static __init void copy_kernel(nasid_t dest_nasid)
+{
+	extern char _stext, _etext;
+	unsigned long dest_kern_start, source_start, source_end, kern_size;
+
+	source_start = (unsigned long)&_stext;
+	source_end = (unsigned long)&_etext;
+	kern_size = source_end - source_start;
+
+	dest_kern_start = CHANGE_ADDR_NASID(MAPPED_KERN_RO_TO_K0(source_start),
+					    dest_nasid);
+	memcpy((void *)dest_kern_start, (void *)source_start, kern_size);
+}
+
+void __init replicate_kernel_text(int maxnodes)
+{
+	cnodeid_t cnode;
+	nasid_t client_nasid;
+	nasid_t server_nasid;
+
+	server_nasid = master_nasid;
+
+	/* Record where the master node should get its kernel text */
+	set_ktext_source(master_nasid, master_nasid);
+
+	for (cnode = 1; cnode < maxnodes; cnode++) {
+		client_nasid = COMPACT_TO_NASID_NODEID(cnode);
+
+		/* Check if this node should get a copy of the kernel */
+		if (CPUMASK_TSTB(ktext_repmask, cnode)) {
+			server_nasid = client_nasid;
+			copy_kernel(server_nasid);
+		}
+
+		/* Record where this node should get its kernel text */
+		set_ktext_source(client_nasid, server_nasid);
+	}
+}
+
+/*
+ * Return pfn of first free page of memory on a node. PROM may allocate
+ * data structures on the first couple of pages of the first slot of each
+ * node. If this is the case, getfirstfree(node) > getslotstart(node, 0).
+ */
+pfn_t node_getfirstfree(cnodeid_t cnode)
+{
+	unsigned long loadbase = CKSEG0;
+	nasid_t nasid = COMPACT_TO_NASID_NODEID(cnode);
+	unsigned long offset;
+
+#ifdef CONFIG_MAPPED_KERNEL
+	loadbase = CKSSEG + 16777216;
+#endif
+	offset = PAGE_ALIGN((unsigned long)(&_end)) - loadbase;
+	if ((cnode == 0) || (CPUMASK_TSTB(ktext_repmask, cnode)))
+		return (TO_NODE(nasid, offset) >> PAGE_SHIFT);
+	else
+		return (KDM_TO_PHYS(PAGE_ALIGN(SYMMON_STK_ADDR(nasid, 0))) >>
+								PAGE_SHIFT);
+}
+