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, 289 insertions, 0 deletions

diff --git a/kernel/drivers/fmc/fmc-sdb.c b/kernel/drivers/fmc/fmc-sdb.c
new file mode 100644
index 000000000..4603fdb74
--- /dev/null
+++ b/kernel/drivers/fmc/fmc-sdb.c
@@ -0,0 +1,289 @@
+/*
+ * Copyright (C) 2012 CERN (www.cern.ch)
+ * Author: Alessandro Rubini <rubini@gnudd.com>
+ *
+ * Released according to the GNU GPL, version 2 or any later version.
+ *
+ * This work is part of the White Rabbit project, a research effort led
+ * by CERN, the European Institute for Nuclear Research.
+ */
+#include <linux/module.h>
+#include <linux/slab.h>
+#include <linux/fmc.h>
+#include <linux/sdb.h>
+#include <linux/err.h>
+#include <linux/fmc-sdb.h>
+#include <asm/byteorder.h>
+
+static uint32_t __sdb_rd(struct fmc_device *fmc, unsigned long address,
+			int convert)
+{
+	uint32_t res = fmc_readl(fmc, address);
+	if (convert)
+		return __be32_to_cpu(res);
+	return res;
+}
+
+static struct sdb_array *__fmc_scan_sdb_tree(struct fmc_device *fmc,
+					     unsigned long sdb_addr,
+					     unsigned long reg_base, int level)
+{
+	uint32_t onew;
+	int i, j, n, convert = 0;
+	struct sdb_array *arr, *sub;
+
+	onew = fmc_readl(fmc, sdb_addr);
+	if (onew == SDB_MAGIC) {
+		/* Uh! If we are little-endian, we must convert */
+		if (SDB_MAGIC != __be32_to_cpu(SDB_MAGIC))
+			convert = 1;
+	} else if (onew == __be32_to_cpu(SDB_MAGIC)) {
+		/* ok, don't convert */
+	} else {
+		return ERR_PTR(-ENOENT);
+	}
+	/* So, the magic was there: get the count from offset 4*/
+	onew = __sdb_rd(fmc, sdb_addr + 4, convert);
+	n = __be16_to_cpu(*(uint16_t *)&onew);
+	arr = kzalloc(sizeof(*arr), GFP_KERNEL);
+	if (!arr)
+		return ERR_PTR(-ENOMEM);
+	arr->record = kzalloc(sizeof(arr->record[0]) * n, GFP_KERNEL);
+	arr->subtree = kzalloc(sizeof(arr->subtree[0]) * n, GFP_KERNEL);
+	if (!arr->record || !arr->subtree) {
+		kfree(arr->record);
+		kfree(arr->subtree);
+		kfree(arr);
+		return ERR_PTR(-ENOMEM);
+	}
+
+	arr->len = n;
+	arr->level = level;
+	arr->fmc = fmc;
+	for (i = 0; i < n; i++) {
+		union  sdb_record *r;
+
+		for (j = 0; j < sizeof(arr->record[0]); j += 4) {
+			*(uint32_t *)((void *)(arr->record + i) + j) =
+				__sdb_rd(fmc, sdb_addr + (i * 64) + j, convert);
+		}
+		r = &arr->record[i];
+		arr->subtree[i] = ERR_PTR(-ENODEV);
+		if (r->empty.record_type == sdb_type_bridge) {
+			struct sdb_component *c = &r->bridge.sdb_component;
+			uint64_t subaddr = __be64_to_cpu(r->bridge.sdb_child);
+			uint64_t newbase = __be64_to_cpu(c->addr_first);
+
+			subaddr += reg_base;
+			newbase += reg_base;
+			sub = __fmc_scan_sdb_tree(fmc, subaddr, newbase,
+						  level + 1);
+			arr->subtree[i] = sub; /* may be error */
+			if (IS_ERR(sub))
+				continue;
+			sub->parent = arr;
+			sub->baseaddr = newbase;
+		}
+	}
+	return arr;
+}
+
+int fmc_scan_sdb_tree(struct fmc_device *fmc, unsigned long address)
+{
+	struct sdb_array *ret;
+	if (fmc->sdb)
+		return -EBUSY;
+	ret = __fmc_scan_sdb_tree(fmc, address, 0 /* regs */, 0);
+	if (IS_ERR(ret))
+		return PTR_ERR(ret);
+	fmc->sdb = ret;
+	return 0;
+}
+EXPORT_SYMBOL(fmc_scan_sdb_tree);
+
+static void __fmc_sdb_free(struct sdb_array *arr)
+{
+	int i, n;
+
+	if (!arr)
+		return;
+	n = arr->len;
+	for (i = 0; i < n; i++) {
+		if (IS_ERR(arr->subtree[i]))
+			continue;
+		__fmc_sdb_free(arr->subtree[i]);
+	}
+	kfree(arr->record);
+	kfree(arr->subtree);
+	kfree(arr);
+}
+
+int fmc_free_sdb_tree(struct fmc_device *fmc)
+{
+	__fmc_sdb_free(fmc->sdb);
+	fmc->sdb = NULL;
+	return 0;
+}
+EXPORT_SYMBOL(fmc_free_sdb_tree);
+
+/* This helper calls reprogram and inizialized sdb as well */
+int fmc_reprogram(struct fmc_device *fmc, struct fmc_driver *d, char *gw,
+			 int sdb_entry)
+{
+	int ret;
+
+	ret = fmc->op->reprogram(fmc, d, gw);
+	if (ret < 0)
+		return ret;
+	if (sdb_entry < 0)
+		return ret;
+
+	/* We are required to find SDB at a given offset */
+	ret = fmc_scan_sdb_tree(fmc, sdb_entry);
+	if (ret < 0) {
+		dev_err(&fmc->dev, "Can't find SDB at address 0x%x\n",
+			sdb_entry);
+		return -ENODEV;
+	}
+	fmc_dump_sdb(fmc);
+	return 0;
+}
+EXPORT_SYMBOL(fmc_reprogram);
+
+static char *__strip_trailing_space(char *buf, char *str, int len)
+{
+	int i = len - 1;
+
+	memcpy(buf, str, len);
+	while(i >= 0 && buf[i] == ' ')
+		buf[i--] = '\0';
+	return buf;
+}
+
+#define __sdb_string(buf, field) ({			\
+	BUILD_BUG_ON(sizeof(buf) < sizeof(field));	\
+	__strip_trailing_space(buf, (void *)(field), sizeof(field));	\
+		})
+
+static void __fmc_show_sdb_tree(const struct fmc_device *fmc,
+				const struct sdb_array *arr)
+{
+	unsigned long base = arr->baseaddr;
+	int i, j, n = arr->len, level = arr->level;
+	char buf[64];
+
+	for (i = 0; i < n; i++) {
+		union  sdb_record *r;
+		struct sdb_product *p;
+		struct sdb_component *c;
+		r = &arr->record[i];
+		c = &r->dev.sdb_component;
+		p = &c->product;
+
+		dev_info(&fmc->dev, "SDB: ");
+
+		for (j = 0; j < level; j++)
+			printk(KERN_CONT "   ");
+		switch (r->empty.record_type) {
+		case sdb_type_interconnect:
+			printk(KERN_CONT "%08llx:%08x %.19s\n",
+			       __be64_to_cpu(p->vendor_id),
+			       __be32_to_cpu(p->device_id),
+			       p->name);
+			break;
+		case sdb_type_device:
+			printk(KERN_CONT "%08llx:%08x %.19s (%08llx-%08llx)\n",
+			       __be64_to_cpu(p->vendor_id),
+			       __be32_to_cpu(p->device_id),
+			       p->name,
+			       __be64_to_cpu(c->addr_first) + base,
+			       __be64_to_cpu(c->addr_last) + base);
+			break;
+		case sdb_type_bridge:
+			printk(KERN_CONT "%08llx:%08x %.19s (bridge: %08llx)\n",
+			       __be64_to_cpu(p->vendor_id),
+			       __be32_to_cpu(p->device_id),
+			       p->name,
+			       __be64_to_cpu(c->addr_first) + base);
+			if (IS_ERR(arr->subtree[i])) {
+				dev_info(&fmc->dev, "SDB: (bridge error %li)\n",
+					 PTR_ERR(arr->subtree[i]));
+				break;
+			}
+			__fmc_show_sdb_tree(fmc, arr->subtree[i]);
+			break;
+		case sdb_type_integration:
+			printk(KERN_CONT "integration\n");
+			break;
+		case sdb_type_repo_url:
+			printk(KERN_CONT "Synthesis repository: %s\n",
+			       __sdb_string(buf, r->repo_url.repo_url));
+			break;
+		case sdb_type_synthesis:
+			printk(KERN_CONT "Bitstream '%s' ",
+			       __sdb_string(buf, r->synthesis.syn_name));
+			printk(KERN_CONT "synthesized %08x by %s ",
+			       __be32_to_cpu(r->synthesis.date),
+			       __sdb_string(buf, r->synthesis.user_name));
+			printk(KERN_CONT "(%s version %x), ",
+			       __sdb_string(buf, r->synthesis.tool_name),
+			       __be32_to_cpu(r->synthesis.tool_version));
+			printk(KERN_CONT "commit %pm\n",
+			       r->synthesis.commit_id);
+			break;
+		case sdb_type_empty:
+			printk(KERN_CONT "empty\n");
+			break;
+		default:
+			printk(KERN_CONT "UNKNOWN TYPE 0x%02x\n",
+			       r->empty.record_type);
+			break;
+		}
+	}
+}
+
+void fmc_show_sdb_tree(const struct fmc_device *fmc)
+{
+	if (!fmc->sdb)
+		return;
+	__fmc_show_sdb_tree(fmc, fmc->sdb);
+}
+EXPORT_SYMBOL(fmc_show_sdb_tree);
+
+signed long fmc_find_sdb_device(struct sdb_array *tree,
+				uint64_t vid, uint32_t did, unsigned long *sz)
+{
+	signed long res = -ENODEV;
+	union  sdb_record *r;
+	struct sdb_product *p;
+	struct sdb_component *c;
+	int i, n = tree->len;
+	uint64_t last, first;
+
+	/* FIXME: what if the first interconnect is not at zero? */
+	for (i = 0; i < n; i++) {
+		r = &tree->record[i];
+		c = &r->dev.sdb_component;
+		p = &c->product;
+
+		if (!IS_ERR(tree->subtree[i]))
+			res = fmc_find_sdb_device(tree->subtree[i],
+						  vid, did, sz);
+		if (res >= 0)
+			return res + tree->baseaddr;
+		if (r->empty.record_type != sdb_type_device)
+			continue;
+		if (__be64_to_cpu(p->vendor_id) != vid)
+			continue;
+		if (__be32_to_cpu(p->device_id) != did)
+			continue;
+		/* found */
+		last = __be64_to_cpu(c->addr_last);
+		first = __be64_to_cpu(c->addr_first);
+		if (sz)
+			*sz = (typeof(*sz))(last + 1 - first);
+		return first + tree->baseaddr;
+	}
+	return res;
+}
+EXPORT_SYMBOL(fmc_find_sdb_device);