[Xen-devel] [PATCH 3/7] xen/acpi/sleep: Enable ACPI sleep via the acpi_os_prepare_sleep_register

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

Provide the registration callback to call in the Xen's
ACPI sleep functionality. This means that during S3/S5
we make a hypercall XENPF_enter_acpi_sleep with the
proper PM1A/PM1B registers.

Based of Ke Yu's <ke.yu@xxxxxxxxx> initial idea.
[ From http://xenbits.xensource.com/linux-2.6.18-xen.hg
change c68699484a65 ]

[v1: Added Copyright and license]
[v2: Added check if PM1A/B the 16-bits MSB contain something. The spec
     only uses 16-bits but might have more in future]
Signed-off-by: Liang Tang <liang.tang@xxxxxxxxxx>
[v1: Improved the git commit description]
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
---
 arch/x86/xen/enlighten.c |    3 ++
 drivers/xen/Makefile     |    2 +-
 drivers/xen/acpi.c       |   62 ++++++++++++++++++++++++++++++++++++++++++++++
 include/xen/acpi.h       |   59 +++++++++++++++++++++++++++++++++++++++++++
 4 files changed, 125 insertions(+), 1 deletions(-)
 create mode 100644 drivers/xen/acpi.c
 create mode 100644 include/xen/acpi.h

diff --git a/arch/x86/xen/enlighten.c b/arch/x86/xen/enlighten.c
index da8afd5..bb0c864 100644
--- a/arch/x86/xen/enlighten.c
+++ b/arch/x86/xen/enlighten.c
@@ -42,6 +42,7 @@
 #include <xen/page.h>
 #include <xen/hvm.h>
 #include <xen/hvc-console.h>
+#include <xen/acpi.h>
 
 #include <asm/paravirt.h>
 #include <asm/apic.h>
@@ -1277,6 +1278,8 @@ asmlinkage void __init xen_start_kernel(void)
 
                /* Make sure ACS will be enabled */
                pci_request_acs();
+
+               xen_acpi_sleep_register();
        }
                
 
diff --git a/drivers/xen/Makefile b/drivers/xen/Makefile
index 974fffd..0435996 100644
--- a/drivers/xen/Makefile
+++ b/drivers/xen/Makefile
@@ -17,7 +17,7 @@ obj-$(CONFIG_XEN_SYS_HYPERVISOR)      += sys-hypervisor.o
 obj-$(CONFIG_XEN_PVHVM)                        += platform-pci.o
 obj-$(CONFIG_XEN_TMEM)                 += tmem.o
 obj-$(CONFIG_SWIOTLB_XEN)              += swiotlb-xen.o
-obj-$(CONFIG_XEN_DOM0)                 += pci.o
+obj-$(CONFIG_XEN_DOM0)                 += pci.o acpi.o
 obj-$(CONFIG_XEN_PCIDEV_BACKEND)       += xen-pciback/
 
 xen-evtchn-y                           := evtchn.o
diff --git a/drivers/xen/acpi.c b/drivers/xen/acpi.c
new file mode 100644
index 0000000..9f81a0f
--- /dev/null
+++ b/drivers/xen/acpi.c
@@ -0,0 +1,62 @@
+/******************************************************************************
+ * acpi.c
+ * acpi file for domain 0 kernel
+ *
+ * Copyright (c) 2011 Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
+ * Copyright (c) 2011 Yu Ke ke.yu@xxxxxxxxx
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation; or, when distributed
+ * separately from the Linux kernel or incorporated into other
+ * software packages, subject to the following license:
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this source file (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use, copy, modify,
+ * merge, publish, distribute, sublicense, and/or sell copies of the Software,
+ * and to permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#include <xen/acpi.h>
+#include <xen/interface/platform.h>
+#include <asm/xen/hypercall.h>
+#include <asm/xen/hypervisor.h>
+
+acpi_status xen_acpi_notify_hypervisor_state(u8 sleep_state,
+                                    u32 pm1a_cnt, u32 pm1b_cnt)
+{
+       struct xen_platform_op op = {
+               .cmd = XENPF_enter_acpi_sleep,
+               .interface_version = XENPF_INTERFACE_VERSION,
+               .u = {
+                       .enter_acpi_sleep = {
+                               .pm1a_cnt_val = (u16)pm1a_cnt,
+                               .pm1b_cnt_val = (u16)pm1b_cnt,
+                               .sleep_state = sleep_state,
+                       },
+               },
+       };
+
+       if ((pm1a_cnt & 0xffff0000) || (pm1b_cnt & 0xffff0000)) {
+               WARN(1, "Using more than 16bits of PM1A/B 0x%x/0x%x!"
+                    "Email xen-devel@xxxxxxxxxxxxxxxxxxx  Thank you.\n", \
+                    pm1a_cnt, pm1b_cnt);
+               return AE_ERROR;
+       }
+
+       HYPERVISOR_dom0_op(&op);
+       return AE_ERROR;
+}
diff --git a/include/xen/acpi.h b/include/xen/acpi.h
new file mode 100644
index 0000000..69a6890
--- /dev/null
+++ b/include/xen/acpi.h
@@ -0,0 +1,59 @@
+/******************************************************************************
+ * acpi.h
+ * acpi file for domain 0 kernel
+ *
+ * Copyright (c) 2011 Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
+ * Copyright (c) 2011 Yu Ke <ke.yu@xxxxxxxxx>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version 2
+ * as published by the Free Software Foundation; or, when distributed
+ * separately from the Linux kernel or incorporated into other
+ * software packages, subject to the following license:
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this source file (the "Software"), to deal in the Software without
+ * restriction, including without limitation the rights to use, copy, modify,
+ * merge, publish, distribute, sublicense, and/or sell copies of the Software,
+ * and to permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
+ * IN THE SOFTWARE.
+ */
+
+#ifndef _XEN_ACPI_H
+#define _XEN_ACPI_H
+
+#include <linux/types.h>
+
+#ifdef CONFIG_XEN_DOM0
+#include <asm/xen/hypervisor.h>
+#include <xen/xen.h>
+#include <linux/acpi.h>
+#include <acpi/acpiosxf.h>
+
+acpi_status xen_acpi_notify_hypervisor_state(u8 sleep_state,
+                                    u32 pm1a_cnt, u32 pm1b_cnd);
+
+static inline void xen_acpi_sleep_register(void)
+{
+       if (xen_initial_domain())
+               acpi_os_prepare_sleep_register(
+                       &xen_acpi_notify_hypervisor_state);
+}
+#else
+static inline void xen_acpi_sleep_register(void)
+{
+}
+#endif
+
+#endif /* _XEN_ACPI_H */
-- 
1.7.7.1


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