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, 207 insertions, 0 deletions

diff --git a/kernel/arch/powerpc/platforms/ps3/htab.c b/kernel/arch/powerpc/platforms/ps3/htab.c
new file mode 100644
index 000000000..2f95d33cf
--- /dev/null
+++ b/kernel/arch/powerpc/platforms/ps3/htab.c
@@ -0,0 +1,207 @@
+/*
+ *  PS3 pagetable management routines.
+ *
+ *  Copyright (C) 2006 Sony Computer Entertainment Inc.
+ *  Copyright 2006, 2007 Sony Corporation
+ *
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; version 2 of the License.
+ *
+ *  This program is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+ */
+
+#include <linux/kernel.h>
+#include <linux/memblock.h>
+
+#include <asm/machdep.h>
+#include <asm/prom.h>
+#include <asm/udbg.h>
+#include <asm/lv1call.h>
+#include <asm/ps3fb.h>
+
+#define PS3_VERBOSE_RESULT
+#include "platform.h"
+
+/**
+ * enum lpar_vas_id - id of LPAR virtual address space.
+ * @lpar_vas_id_current: Current selected virtual address space
+ *
+ * Identify the target LPAR address space.
+ */
+
+enum ps3_lpar_vas_id {
+	PS3_LPAR_VAS_ID_CURRENT = 0,
+};
+
+
+static DEFINE_SPINLOCK(ps3_htab_lock);
+
+static long ps3_hpte_insert(unsigned long hpte_group, unsigned long vpn,
+	unsigned long pa, unsigned long rflags, unsigned long vflags,
+	int psize, int apsize, int ssize)
+{
+	int result;
+	u64 hpte_v, hpte_r;
+	u64 inserted_index;
+	u64 evicted_v, evicted_r;
+	u64 hpte_v_array[4], hpte_rs;
+	unsigned long flags;
+	long ret = -1;
+
+	/*
+	 * lv1_insert_htab_entry() will search for victim
+	 * entry in both primary and secondary pte group
+	 */
+	vflags &= ~HPTE_V_SECONDARY;
+
+	hpte_v = hpte_encode_v(vpn, psize, apsize, ssize) | vflags | HPTE_V_VALID;
+	hpte_r = hpte_encode_r(ps3_mm_phys_to_lpar(pa), psize, apsize) | rflags;
+
+	spin_lock_irqsave(&ps3_htab_lock, flags);
+
+	/* talk hvc to replace entries BOLTED == 0 */
+	result = lv1_insert_htab_entry(PS3_LPAR_VAS_ID_CURRENT, hpte_group,
+				       hpte_v, hpte_r,
+				       HPTE_V_BOLTED, 0,
+				       &inserted_index,
+				       &evicted_v, &evicted_r);
+
+	if (result) {
+		/* all entries bolted !*/
+		pr_info("%s:result=%s vpn=%lx pa=%lx ix=%lx v=%llx r=%llx\n",
+			__func__, ps3_result(result), vpn, pa, hpte_group,
+			hpte_v, hpte_r);
+		BUG();
+	}
+
+	/*
+	 * see if the entry is inserted into secondary pteg
+	 */
+	result = lv1_read_htab_entries(PS3_LPAR_VAS_ID_CURRENT,
+				       inserted_index & ~0x3UL,
+				       &hpte_v_array[0], &hpte_v_array[1],
+				       &hpte_v_array[2], &hpte_v_array[3],
+				       &hpte_rs);
+	BUG_ON(result);
+
+	if (hpte_v_array[inserted_index % 4] & HPTE_V_SECONDARY)
+		ret = (inserted_index & 7) | (1 << 3);
+	else
+		ret = inserted_index & 7;
+
+	spin_unlock_irqrestore(&ps3_htab_lock, flags);
+
+	return ret;
+}
+
+static long ps3_hpte_remove(unsigned long hpte_group)
+{
+	panic("ps3_hpte_remove() not implemented");
+	return 0;
+}
+
+static long ps3_hpte_updatepp(unsigned long slot, unsigned long newpp,
+			      unsigned long vpn, int psize, int apsize,
+			      int ssize, unsigned long inv_flags)
+{
+	int result;
+	u64 hpte_v, want_v, hpte_rs;
+	u64 hpte_v_array[4];
+	unsigned long flags;
+	long ret;
+
+	want_v = hpte_encode_avpn(vpn, psize, ssize);
+
+	spin_lock_irqsave(&ps3_htab_lock, flags);
+
+	result = lv1_read_htab_entries(PS3_LPAR_VAS_ID_CURRENT, slot & ~0x3UL,
+				       &hpte_v_array[0], &hpte_v_array[1],
+				       &hpte_v_array[2], &hpte_v_array[3],
+				       &hpte_rs);
+
+	if (result) {
+		pr_info("%s: result=%s read vpn=%lx slot=%lx psize=%d\n",
+			__func__, ps3_result(result), vpn, slot, psize);
+		BUG();
+	}
+
+	hpte_v = hpte_v_array[slot % 4];
+
+	/*
+	 * As lv1_read_htab_entries() does not give us the RPN, we can
+	 * not synthesize the new hpte_r value here, and therefore can
+	 * not update the hpte with lv1_insert_htab_entry(), so we
+	 * instead invalidate it and ask the caller to update it via
+	 * ps3_hpte_insert() by returning a -1 value.
+	 */
+	if (!HPTE_V_COMPARE(hpte_v, want_v) || !(hpte_v & HPTE_V_VALID)) {
+		/* not found */
+		ret = -1;
+	} else {
+		/* entry found, just invalidate it */
+		result = lv1_write_htab_entry(PS3_LPAR_VAS_ID_CURRENT,
+					      slot, 0, 0);
+		ret = -1;
+	}
+
+	spin_unlock_irqrestore(&ps3_htab_lock, flags);
+	return ret;
+}
+
+static void ps3_hpte_updateboltedpp(unsigned long newpp, unsigned long ea,
+	int psize, int ssize)
+{
+	panic("ps3_hpte_updateboltedpp() not implemented");
+}
+
+static void ps3_hpte_invalidate(unsigned long slot, unsigned long vpn,
+				int psize, int apsize, int ssize, int local)
+{
+	unsigned long flags;
+	int result;
+
+	spin_lock_irqsave(&ps3_htab_lock, flags);
+
+	result = lv1_write_htab_entry(PS3_LPAR_VAS_ID_CURRENT, slot, 0, 0);
+
+	if (result) {
+		pr_info("%s: result=%s vpn=%lx slot=%lx psize=%d\n",
+			__func__, ps3_result(result), vpn, slot, psize);
+		BUG();
+	}
+
+	spin_unlock_irqrestore(&ps3_htab_lock, flags);
+}
+
+static void ps3_hpte_clear(void)
+{
+	unsigned long hpte_count = (1UL << ppc64_pft_size) >> 4;
+	u64 i;
+
+	for (i = 0; i < hpte_count; i++)
+		lv1_write_htab_entry(PS3_LPAR_VAS_ID_CURRENT, i, 0, 0);
+
+	ps3_mm_shutdown();
+	ps3_mm_vas_destroy();
+}
+
+void __init ps3_hpte_init(unsigned long htab_size)
+{
+	ppc_md.hpte_invalidate = ps3_hpte_invalidate;
+	ppc_md.hpte_updatepp = ps3_hpte_updatepp;
+	ppc_md.hpte_updateboltedpp = ps3_hpte_updateboltedpp;
+	ppc_md.hpte_insert = ps3_hpte_insert;
+	ppc_md.hpte_remove = ps3_hpte_remove;
+	ppc_md.hpte_clear_all = ps3_hpte_clear;
+
+	ppc64_pft_size = __ilog2(htab_size);
+}
+