Date:	Fri, 23 Dec 2011 10:28:21 +0000
From:	"Liu, Jinsong" <jinsong.liu@...el.com>
To:	"konrad.wilk@...cle.com" <konrad.wilk@...cle.com>
CC:	"Jiang, Yunhong" <yunhong.jiang@...el.com>,
	"jeremy.fitzhardinge@...rix.com" <jeremy.fitzhardinge@...rix.com>,
	"Shan, Haitao" <haitao.shan@...el.com>,
	"Zhao, Yakui" <yakui.zhao@...el.com>,
	"Brown, Len" <len.brown@...el.com>,
	"Luck, Tony" <tony.luck@...el.com>,
	"Kleen, Andi" <andi.kleen@...el.com>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	Kernel development list <linux-kernel@...r.kernel.org>
Subject: [PATCH 06/10] Xen: Add memory hotadd to pvops dom0

>From a5d21e2a01049eef6aa64406e71f6574e7a371c1 Mon Sep 17 00:00:00 2001
From: Liu Jinsong <jinsong.liu@...el.com>
Date: Sun, 11 Dec 2011 21:51:28 +0800
Subject: [PATCH 06/10] Xen: Add memory hotadd to pvops dom0

This patch rebased from Jeremy's pvops commit
fe3cb1ebf78399fd5176ff6aa1c9ab498f2d8bd7

When memory hotadd event happen, a Xen hook will be called, to notify
hypervisor of the new added memory.

Because xen hypervisor will use the new memory to setup frametable/m2p
table, so dom0 will always return success to acpi bios, and notify xen
hypervisor later.

It add a hook in driver/acpi/acpi_memhotplug.c, but that change is
quite small, not sure if it is acceptable. Other method is to provide
a xen specific acpi_memory_device_driver, but I'm not sure if it worth
to add so much changes, to simply avoid two hooks.

Signed-off-by: Liu, Jinsong <jinsong.liu@...el.com>
Signed-off-by: Jiang, Yunhong <yunhong.jiang@...el.com>
Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@...rix.com>
---
 drivers/acpi/acpi_memhotplug.c    |    4 +
 drivers/xen/Makefile              |    1 +
 drivers/xen/xen_acpi_memhotplug.c |  209 +++++++++++++++++++++++++++++++++++++
 include/xen/acpi.h                |    5 +
 include/xen/interface/platform.h  |    9 ++
 5 files changed, 228 insertions(+), 0 deletions(-)
 create mode 100644 drivers/xen/xen_acpi_memhotplug.c

diff --git a/drivers/acpi/acpi_memhotplug.c b/drivers/acpi/acpi_memhotplug.c
index e28e64d..2f2169e 100644
--- a/drivers/acpi/acpi_memhotplug.c
+++ b/drivers/acpi/acpi_memhotplug.c
@@ -32,6 +32,7 @@
 #include <linux/memory_hotplug.h>
 #include <linux/slab.h>
 #include <acpi/acpi_drivers.h>
+#include <xen/acpi.h>
 
 #define ACPI_MEMORY_DEVICE_CLASS		"memory"
 #define ACPI_MEMORY_DEVICE_HID			"PNP0C80"
@@ -214,6 +215,9 @@ static int acpi_memory_enable_device(struct acpi_memory_device *mem_device)
 		return result;
 	}
 
+	if (xen_initial_domain())
+		return xen_hotadd_memory(mem_device);
+
 	node = acpi_get_node(mem_device->device->handle);
 	/*
 	 * Tell the VM there is more memory here...
diff --git a/drivers/xen/Makefile b/drivers/xen/Makefile
index aedaf48..7dc3c0b 100644
--- a/drivers/xen/Makefile
+++ b/drivers/xen/Makefile
@@ -20,6 +20,7 @@ obj-$(CONFIG_XEN_TMEM)			+= tmem.o
 obj-$(CONFIG_SWIOTLB_XEN)		+= swiotlb-xen.o
 obj-$(CONFIG_XEN_DOM0)			+= pci.o acpi.o
 obj-$(CONFIG_XEN_PCIDEV_BACKEND)	+= xen-pciback/
+obj-$(CONFIG_ACPI_HOTPLUG_MEMORY)	+= xen_acpi_memhotplug.o
 ifdef CONFIG_ACPI_PROCESSOR_XEN
 obj-$(CONFIG_ACPI_PROCESSOR)		+= acpi_processor.o
 endif
diff --git a/drivers/xen/xen_acpi_memhotplug.c b/drivers/xen/xen_acpi_memhotplug.c
new file mode 100644
index 0000000..0c4af99
--- /dev/null
+++ b/drivers/xen/xen_acpi_memhotplug.c
@@ -0,0 +1,209 @@
+/*
+ *  xen_acpi_memhotplug.c - interface to notify Xen on memory device hotadd
+ *
+ *  Copyright (C) 2008, Intel 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; either version 2 of the License, or (at
+ *  your option) any later version.
+ *
+ *  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/module.h>
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/memory_hotplug.h>
+#include <acpi/acpi_drivers.h>
+#include <xen/interface/platform.h>
+#include <linux/interrupt.h>
+#include <linux/spinlock.h>
+#include <asm/xen/hypervisor.h>
+#include <asm/xen/hypercall.h>
+#include <xen/acpi.h>
+
+struct xen_hotmem_entry {
+	struct list_head hotmem_list;
+	uint64_t start;
+	uint64_t end;
+	uint32_t flags;
+	uint32_t pxm;
+};
+
+struct xen_hotmem_list {
+	struct list_head list;
+	int entry_nr;
+} xen_hotmem;
+
+DEFINE_SPINLOCK(xen_hotmem_lock);
+
+static int xen_hyper_addmem(struct xen_hotmem_entry *entry)
+{
+	int ret;
+
+	xen_platform_op_t op = {
+		.cmd            = XENPF_mem_hotadd,
+		.interface_version  = XENPF_INTERFACE_VERSION,
+	};
+	op.u.mem_add.spfn = entry->start >> PAGE_SHIFT;
+	op.u.mem_add.epfn = entry->end >> PAGE_SHIFT;
+	op.u.mem_add.flags = entry->flags;
+	op.u.mem_add.pxm = entry->pxm;
+
+	ret = HYPERVISOR_dom0_op(&op);
+	return ret;
+}
+
+static int add_hotmem_entry(int pxm, uint64_t start,
+			uint64_t length, uint32_t flags)
+{
+	struct xen_hotmem_entry *entry;
+
+	if (pxm < 0 || !length)
+		return -EINVAL;
+
+	entry = kzalloc(sizeof(struct xen_hotmem_entry), GFP_ATOMIC);
+	if (!entry)
+		return -ENOMEM;
+
+	INIT_LIST_HEAD(&entry->hotmem_list);
+	entry->start = start;
+	entry->end = start + length;
+	entry->flags = flags;
+	entry->pxm = pxm;
+
+	spin_lock(&xen_hotmem_lock);
+
+	list_add_tail(&entry->hotmem_list, &xen_hotmem.list);
+	xen_hotmem.entry_nr++;
+
+	spin_unlock(&xen_hotmem_lock);
+
+	return 0;
+}
+
+static int free_hotmem_entry(struct xen_hotmem_entry *entry)
+{
+	list_del(&entry->hotmem_list);
+	kfree(entry);
+
+	return 0;
+}
+
+static void xen_hotadd_mem_dpc(struct work_struct *work)
+{
+	struct list_head *elem, *tmp;
+	struct xen_hotmem_entry *entry;
+	unsigned long flags;
+	int ret;
+
+	spin_lock_irqsave(&xen_hotmem_lock, flags);
+	list_for_each_safe(elem, tmp, &xen_hotmem.list) {
+		entry = list_entry(elem, struct xen_hotmem_entry, hotmem_list);
+		ret = xen_hyper_addmem(entry);
+		if (ret)
+			printk(KERN_WARNING "xen addmem failed with %x\n", ret);
+		free_hotmem_entry(entry);
+		xen_hotmem.entry_nr--;
+	}
+	spin_unlock_irqrestore(&xen_hotmem_lock, flags);
+}
+
+static DECLARE_WORK(xen_hotadd_mem_work, xen_hotadd_mem_dpc);
+
+static int xen_acpi_get_pxm(acpi_handle h)
+{
+	unsigned long long pxm;
+	acpi_status status;
+	acpi_handle handle;
+	acpi_handle phandle = h;
+
+	do {
+		handle = phandle;
+		status = acpi_evaluate_integer(handle, "_PXM", NULL, &pxm);
+		if (ACPI_SUCCESS(status))
+			return pxm;
+		status = acpi_get_parent(handle, &phandle);
+	} while (ACPI_SUCCESS(status));
+
+	return -1;
+}
+
+int xen_hotadd_memory(struct acpi_memory_device *mem_device)
+{
+	int pxm, result;
+	int num_enabled = 0;
+	struct acpi_memory_info *info;
+
+	if (!mem_device)
+		return -EINVAL;
+
+	pxm = xen_acpi_get_pxm(mem_device->device->handle);
+
+	if (pxm < 0)
+		return -EINVAL;
+
+	/*
+	 * Always return success to ACPI driver, and notify hypervisor later
+	 * because hypervisor will utilize the memory in memory hotadd hypercall
+	 */
+	list_for_each_entry(info, &mem_device->res_list, list) {
+		if (info->enabled) { /* just sanity check...*/
+			num_enabled++;
+			continue;
+		}
+		/*
+		 * If the memory block size is zero, please ignore it.
+		 * Don't try to do the following memory hotplug flowchart.
+		 */
+		if (!info->length)
+			continue;
+
+		result = add_hotmem_entry(pxm, info->start_addr,
+					info->length, 0);
+		if (result)
+			continue;
+		info->enabled = 1;
+		num_enabled++;
+	}
+
+	if (!num_enabled)
+		return -EINVAL;
+
+	schedule_work(&xen_hotadd_mem_work);
+
+	return 0;
+}
+EXPORT_SYMBOL(xen_hotadd_memory);
+
+static int xen_hotadd_mem_init(void)
+{
+	if (!xen_initial_domain())
+		return -ENODEV;
+
+	INIT_LIST_HEAD(&xen_hotmem.list);
+	xen_hotmem.entry_nr = 0;
+
+	return 0;
+}
+
+static void xen_hotadd_mem_exit(void)
+{
+	flush_scheduled_work();
+}
+
+module_init(xen_hotadd_mem_init);
+module_exit(xen_hotadd_mem_exit);
+MODULE_LICENSE("GPL");
diff --git a/include/xen/acpi.h b/include/xen/acpi.h
index 7aa282d..8b3462e 100644
--- a/include/xen/acpi.h
+++ b/include/xen/acpi.h
@@ -107,6 +107,11 @@ static inline int xen_acpi_processor_get_performance(struct acpi_processor *pr)
 }
 #endif
 
+#if defined(CONFIG_ACPI_HOTPLUG_MEMORY) || \
+defined(CONFIG_ACPI_HOTPLUG_MEMORY_MODULE)
+int xen_hotadd_memory(struct acpi_memory_device *mem_device);
+#endif
+
 #if defined(CONFIG_ACPI_PROCESSOR_XEN) || \
 defined(CONFIG_ACPI_PROCESSOR_XEN_MODULE)
 
diff --git a/include/xen/interface/platform.h b/include/xen/interface/platform.h
index 9fd6b07..0787c68 100644
--- a/include/xen/interface/platform.h
+++ b/include/xen/interface/platform.h
@@ -329,6 +329,14 @@ struct xenpf_cpu_hotadd {
 	uint32_t pxm;
 };
 
+#define XENPF_mem_hotadd    59
+struct xenpf_mem_hotadd {
+	uint64_t spfn;
+	uint64_t epfn;
+	uint32_t pxm;
+	uint32_t flags;
+};
+
 struct xen_platform_op {
 	uint32_t cmd;
 	uint32_t interface_version; /* XENPF_INTERFACE_VERSION */
@@ -347,6 +355,7 @@ struct xen_platform_op {
 		struct xenpf_pcpuinfo          pcpu_info;
 		struct xenpf_cpu_ol            cpu_ol;
 		struct xenpf_cpu_hotadd        cpu_add;
+		struct xenpf_mem_hotadd        mem_add;
 		uint8_t                        pad[128];
 	} u;
 };
-- 
1.6.5.6

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