From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:60264) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Xyx7j-0004zO-Dd for qemu-devel@nongnu.org; Thu, 11 Dec 2014 01:21:20 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1Xyx7e-0002df-Mi for qemu-devel@nongnu.org; Thu, 11 Dec 2014 01:21:15 -0500 Received: from [59.151.112.132] (port=17826 helo=heian.cn.fujitsu.com) by eggs.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1Xyx7d-0002RX-QG for qemu-devel@nongnu.org; Thu, 11 Dec 2014 01:21:10 -0500 From: Tang Chen Date: Thu, 11 Dec 2014 14:19:51 +0800 Message-ID: <1418278792-24118-13-git-send-email-tangchen@cn.fujitsu.com> In-Reply-To: <1418278792-24118-1-git-send-email-tangchen@cn.fujitsu.com> References: <1418278792-24118-1-git-send-email-tangchen@cn.fujitsu.com> MIME-Version: 1.0 Content-Type: text/plain Subject: [Qemu-devel] [PATCH RESEND v1 Part2 12/13] acpi: Add hardware implementation for memory hot unplug. List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org, imammedo@redhat.com, mst@redhat.com, pbonzini@redhat.com Cc: guz.fnst@cn.fujitsu.com, hutao@cn.fujitsu.com, isimatu.yasuaki@jp.fujitsu.com, zhugh.fnst@cn.fujitsu.com, tangchen@cn.fujitsu.com This patch adds a new bit to memory hotplug IO port indicating that ej0 has been evaluated by guest OS. And call pc-dimm unplug cb to do the real removal. Signed-off-by: Hu Tao Signed-off-by: Tang Chen --- docs/specs/acpi_mem_hotplug.txt | 8 ++++++-- hw/acpi/memory_hotplug.c | 23 ++++++++++++++++++++--- hw/core/qdev.c | 2 +- include/hw/qdev-core.h | 1 + 4 files changed, 28 insertions(+), 6 deletions(-) diff --git a/docs/specs/acpi_mem_hotplug.txt b/docs/specs/acpi_mem_hotplug.txt index 1290994..28a1ffa 100644 --- a/docs/specs/acpi_mem_hotplug.txt +++ b/docs/specs/acpi_mem_hotplug.txt @@ -19,7 +19,9 @@ Memory hot-plug interface (IO port 0xa00-0xa17, 1-4 byte access): 1: Device insert event, used to distinguish device for which no device check event to OSPM was issued. It's valid only when bit 1 is set. - 2-7: reserved and should be ignored by OSPM + 2: Device remove event, used to indicate that device is being + removed. + 3-7: reserved and should be ignored by OSPM [0x15-0x17] reserved write access: @@ -35,7 +37,9 @@ Memory hot-plug interface (IO port 0xa00-0xa17, 1-4 byte access): 1: if set to 1 clears device insert event, set by OSPM after it has emitted device check event for the selected memory device - 2-7: reserved, OSPM must clear them before writing to register + 2: set by hardware after it has emitted device eject event for + selected memory device + 3-7: reserved, OSPM must clear them before writing to register Selecting memory device slot beyond present range has no effect on platform: - write accesses to memory hot-plug registers not documented above are diff --git a/hw/acpi/memory_hotplug.c b/hw/acpi/memory_hotplug.c index 2b0c8ca..b9e8752 100644 --- a/hw/acpi/memory_hotplug.c +++ b/hw/acpi/memory_hotplug.c @@ -2,6 +2,7 @@ #include "hw/acpi/pc-hotplug.h" #include "hw/mem/pc-dimm.h" #include "hw/boards.h" +#include "hw/qdev-core.h" #include "trace.h" #include "qapi-event.h" @@ -75,6 +76,7 @@ static uint64_t acpi_memory_hotplug_read(void *opaque, hwaddr addr, case 0x14: /* pack and return is_* fields */ val |= mdev->is_enabled ? 1 : 0; val |= mdev->is_inserting ? 2 : 0; + val |= mdev->is_removing ? 4 : 0; trace_mhp_acpi_read_flags(mem_st->selector, val); break; default: @@ -90,6 +92,8 @@ static void acpi_memory_hotplug_write(void *opaque, hwaddr addr, uint64_t data, MemHotplugState *mem_st = opaque; MemStatus *mdev; ACPIOSTInfo *info; + DeviceState *dev = NULL; + HotplugHandler *hotplug_ctrl = NULL; if (!mem_st->dev_count) { return; @@ -121,21 +125,34 @@ static void acpi_memory_hotplug_write(void *opaque, hwaddr addr, uint64_t data, mdev = &mem_st->devs[mem_st->selector]; mdev->ost_status = data; trace_mhp_acpi_write_ost_status(mem_st->selector, mdev->ost_status); - /* TODO: implement memory removal on guest signal */ info = acpi_memory_device_status(mem_st->selector, mdev); qapi_event_send_acpi_device_ost(info, &error_abort); qapi_free_ACPIOSTInfo(info); break; - case 0x14: + case 0x14: /* set is_* fields */ mdev = &mem_st->devs[mem_st->selector]; + if (data & 2) { /* clear insert event */ mdev->is_inserting = false; trace_mhp_acpi_clear_insert_evt(mem_st->selector); + } else if (data & 4) { /* request removal of device */ + /* + * QEmu memory hot unplug is an asynchronized procedure. QEmu first + * calls pc-dimm unplug request cb to send a SCI to guest. When the + * Guest OS finished handling the SCI, it evaluates ACPI ej0, and + * QEmu calls pc-dimm unplug cb to remove memory device. + */ + dev = DEVICE(mdev->dimm); + hotplug_ctrl = qdev_get_hotplug_handler(dev); + /* Call pc-dimm unplug cb. */ + hotplug_handler_unplug(hotplug_ctrl, dev, NULL); } + + break; + default: break; } - } static const MemoryRegionOps acpi_memory_hotplug_ops = { .read = acpi_memory_hotplug_read, diff --git a/hw/core/qdev.c b/hw/core/qdev.c index 35fd00d..ab45b77 100644 --- a/hw/core/qdev.c +++ b/hw/core/qdev.c @@ -223,7 +223,7 @@ void qdev_set_legacy_instance_id(DeviceState *dev, int alias_id, dev->alias_required_for_version = required_for_version; } -static HotplugHandler *qdev_get_hotplug_handler(DeviceState *dev) +HotplugHandler *qdev_get_hotplug_handler(DeviceState *dev) { HotplugHandler *hotplug_ctrl = NULL; diff --git a/include/hw/qdev-core.h b/include/hw/qdev-core.h index 589bbe7..60f549e 100644 --- a/include/hw/qdev-core.h +++ b/include/hw/qdev-core.h @@ -261,6 +261,7 @@ void qdev_init_nofail(DeviceState *dev); void qdev_set_legacy_instance_id(DeviceState *dev, int alias_id, int required_for_version); void qdev_unplug(DeviceState *dev, Error **errp); +HotplugHandler *qdev_get_hotplug_handler(DeviceState *dev); void qdev_simple_device_unplug_cb(HotplugHandler *hotplug_dev, DeviceState *dev, Error **errp); void qdev_machine_creation_done(void); -- 1.8.4.2