Xen implementation of the external control operation interface
From: Yu Ke <ke.yu@xxxxxxxxx>
This patch implements the Xen version of the external control operation
interface.
Signed-off-by: Yu Ke <ke.yu@xxxxxxxxx>
Signed-off-by: Tian Kevin <kevin.tian@xxxxxxxxx>
---
drivers/xen/Kconfig | 5 +
drivers/xen/Makefile | 1
drivers/xen/processor_extcntl.c | 246 +++++++++++++++++++++++++++++++++++++++
3 files changed, 252 insertions(+), 0 deletions(-)
create mode 100644 drivers/xen/processor_extcntl.c
diff --git a/drivers/xen/Kconfig b/drivers/xen/Kconfig
index d1b2642..c0370b6 100644
--- a/drivers/xen/Kconfig
+++ b/drivers/xen/Kconfig
@@ -98,3 +98,8 @@ config XEN_GNTDEV
config XEN_S3
def_bool y
depends on XEN_DOM0 && ACPI
+
+config XEN_PROCESSOR_EXTERNAL_CONTROL
+ def_bool y
+ depends on XEN_DOM0 && PROCESSOR_EXTERNAL_CONTROL
+
diff --git a/drivers/xen/Makefile b/drivers/xen/Makefile
index e680033..3a1a54b 100644
--- a/drivers/xen/Makefile
+++ b/drivers/xen/Makefile
@@ -11,3 +11,4 @@ obj-$(CONFIG_XEN_NETDEV_BACKEND) += netback/
obj-$(CONFIG_XENFS) += xenfs/
obj-$(CONFIG_XEN_SYS_HYPERVISOR) += sys-hypervisor.o
obj-$(CONFIG_XEN_S3) += acpi.o
+obj-$(CONFIG_XEN_PROCESSOR_EXTERNAL_CONTROL) += processor_extcntl.o
diff --git a/drivers/xen/processor_extcntl.c b/drivers/xen/processor_extcntl.c
new file mode 100644
index 0000000..b5b5d62
--- /dev/null
+++ b/drivers/xen/processor_extcntl.c
@@ -0,0 +1,246 @@
+/*
+ * processor_extcntl.c - interface to notify Xen
+ *
+ * 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/init.h>
+#include <linux/types.h>
+#include <linux/acpi.h>
+#include <linux/pm.h>
+#include <linux/cpu.h>
+
+#include <linux/cpufreq.h>
+#include <acpi/processor.h>
+#include <xen/acpi.h>
+
+#include <asm/xen/hypercall.h>
+#include <asm/xen/hypervisor.h>
+
+static inline void xen_convert_pct_reg(struct xen_pct_register *xpct,
+ struct acpi_pct_register *apct)
+{
+ xpct->descriptor = apct->descriptor;
+ xpct->length = apct->length;
+ xpct->space_id = apct->space_id;
+ xpct->bit_width = apct->bit_width;
+ xpct->bit_offset = apct->bit_offset;
+ xpct->reserved = apct->reserved;
+ xpct->address = apct->address;
+}
+
+static inline void xen_convert_pss_states(struct xen_processor_px *xpss,
+ struct acpi_processor_px *apss, int state_count)
+{
+ int i;
+ for(i=0; i<state_count; i++) {
+ xpss->core_frequency = apss->core_frequency;
+ xpss->power = apss->power;
+ xpss->transition_latency = apss->transition_latency;
+ xpss->bus_master_latency = apss->bus_master_latency;
+ xpss->control = apss->control;
+ xpss->status = apss->status;
+ xpss++;
+ apss++;
+ }
+}
+
+static inline void xen_convert_psd_pack(struct xen_psd_package *xpsd,
+ struct acpi_psd_package *apsd)
+{
+ xpsd->num_entries = apsd->num_entries;
+ xpsd->revision = apsd->revision;
+ xpsd->domain = apsd->domain;
+ xpsd->coord_type = apsd->coord_type;
+ xpsd->num_processors = apsd->num_processors;
+}
+
+static int xen_cx_notifier(struct acpi_processor *pr, int action)
+{
+ int ret, count = 0, i;
+ xen_platform_op_t op = {
+ .cmd = XENPF_set_processor_pminfo,
+ .interface_version = XENPF_INTERFACE_VERSION,
+ .u.set_pminfo.id = pr->acpi_id,
+ .u.set_pminfo.type = XEN_PM_CX,
+ };
+ struct xen_processor_cx *data, *buf;
+ struct acpi_processor_cx *cx;
+
+ if (action == PROCESSOR_PM_CHANGE)
+ return -EINVAL;
+
+ /* Convert to Xen defined structure and hypercall */
+ buf = kzalloc(pr->power.count * sizeof(struct xen_processor_cx),
+ GFP_KERNEL);
+ if (!buf)
+ return -ENOMEM;
+
+ data = buf;
+ for (i = 1; i <= pr->power.count; i++) {
+ cx = &pr->power.states[i];
+ /* Skip invalid cstate entry */
+ if (!cx->valid)
+ continue;
+
+ data->type = cx->type;
+ data->latency = cx->latency;
+ data->power = cx->power;
+ data->reg.space_id = cx->reg.space_id;
+ data->reg.bit_width = cx->reg.bit_width;
+ data->reg.bit_offset = cx->reg.bit_offset;
+ data->reg.access_size = cx->reg.reserved;
+ data->reg.address = cx->reg.address;
+
+ /* Get dependency relationships, _CSD is not supported yet */
+ data->dpcnt = 0;
+ set_xen_guest_handle(data->dp, NULL);
+
+ data++;
+ count++;
+ }
+
+ if (!count) {
+ printk("No available Cx info for cpu %d\n", pr->acpi_id);
+ kfree(buf);
+ return -EINVAL;
+ }
+
+ op.u.set_pminfo.power.count = count;
+ op.u.set_pminfo.power.flags.bm_control = pr->flags.bm_control;
+ op.u.set_pminfo.power.flags.bm_check = pr->flags.bm_check;
+ op.u.set_pminfo.power.flags.has_cst = pr->flags.has_cst;
+ op.u.set_pminfo.power.flags.power_setup_done =
pr->flags.power_setup_done;
+
+ set_xen_guest_handle(op.u.set_pminfo.power.states, buf);
+ ret = HYPERVISOR_dom0_op(&op);
+ kfree(buf);
+ return ret;
+}
+
+static int xen_px_notifier(struct acpi_processor *pr, int action)
+{
+ int ret = -EINVAL;
+ xen_platform_op_t op = {
+ .cmd = XENPF_set_processor_pminfo,
+ .interface_version = XENPF_INTERFACE_VERSION,
+ .u.set_pminfo.id = pr->acpi_id,
+ .u.set_pminfo.type = XEN_PM_PX,
+ };
+ struct xen_processor_performance *perf;
+ struct xen_processor_px *states = NULL;
+ struct acpi_processor_performance *px;
+ struct acpi_psd_package *pdomain;
+
+ if (!pr)
+ return -EINVAL;
+
+ perf = &op.u.set_pminfo.perf;
+ px = pr->performance;
+
+ switch(action) {
+ case PROCESSOR_PM_CHANGE:
+ /* ppc dynamic handle */
+ perf->flags = XEN_PX_PPC;
+ perf->platform_limit = pr->performance_platform_limit;
+
+ ret = HYPERVISOR_dom0_op(&op);
+ break;
+
+ case PROCESSOR_PM_INIT:
+ /* px normal init */
+ perf->flags = XEN_PX_PPC |
+ XEN_PX_PCT |
+ XEN_PX_PSS |
+ XEN_PX_PSD;
+
+ /* ppc */
+ perf->platform_limit = pr->performance_platform_limit;
+
+ /* pct */
+ xen_convert_pct_reg(&perf->control_register,
&px->control_register);
+ xen_convert_pct_reg(&perf->status_register,
&px->status_register);
+
+ /* pss */
+ perf->state_count = px->state_count;
+ states =
kzalloc(px->state_count*sizeof(xen_processor_px_t),GFP_KERNEL);
+ if (!states)
+ return -ENOMEM;
+ xen_convert_pss_states(states, px->states, px->state_count);
+ set_xen_guest_handle(perf->states, states);
+
+ /* psd */
+ pdomain = &px->domain_info;
+ xen_convert_psd_pack(&perf->domain_info, pdomain);
+ if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ALL)
+ perf->shared_type = CPUFREQ_SHARED_TYPE_ALL;
+ else if (pdomain->coord_type == DOMAIN_COORD_TYPE_SW_ANY)
+ perf->shared_type = CPUFREQ_SHARED_TYPE_ANY;
+ else if (pdomain->coord_type == DOMAIN_COORD_TYPE_HW_ALL)
+ perf->shared_type = CPUFREQ_SHARED_TYPE_HW;
+ else {
+ ret = -ENODEV;
+ kfree(states);
+ break;
+ }
+
+ ret = HYPERVISOR_dom0_op(&op);
+ kfree(states);
+ break;
+
+ default:
+ break;
+ }
+
+ return ret;
+}
+
+static int xen_tx_notifier(struct acpi_processor *pr, int action)
+{
+ return -EINVAL;
+}
+static int xen_hotplug_notifier(struct acpi_processor *pr, int event)
+{
+ return -EINVAL;
+}
+
+static struct processor_extcntl_ops xen_extcntl_ops = {
+ .hotplug = xen_hotplug_notifier,
+};
+
+static int __init xen_acpi_processor_extcntl_init(void)
+{
+ unsigned int pmbits = (xen_start_info->flags & SIF_PM_MASK) >> 8;
+
+ if (!pmbits)
+ return 0;
+ if (pmbits & XEN_PROCESSOR_PM_CX)
+ xen_extcntl_ops.pm_ops[PM_TYPE_IDLE] = xen_cx_notifier;
+ if (pmbits & XEN_PROCESSOR_PM_PX)
+ xen_extcntl_ops.pm_ops[PM_TYPE_PERF] = xen_px_notifier;
+ if (pmbits & XEN_PROCESSOR_PM_TX)
+ xen_extcntl_ops.pm_ops[PM_TYPE_THR] = xen_tx_notifier;
+
+ processor_extcntl_register(&xen_extcntl_ops);
+ return 0;
+}
+
+subsys_initcall(xen_acpi_processor_extcntl_init);
external-control-xen.patch
Description: external-control-xen.patch
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