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Message-Id: <1329782868-1696-2-git-send-email-konrad.wilk@oracle.com>
Date: Mon, 20 Feb 2012 19:07:46 -0500
From: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To: pasik@....fi
Cc: xen-devel@...ts.xensource.com, linux-acpi@...r.kernel.org,
linux-kernel@...r.kernel.org, JBeulich@...ell.com,
kevin.tian@...el.com, ke.yu@...el.com,
Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
Subject: [PATCH 1/3] xen/processor-passthru: Change the name to processor-passthru
Suggested-by: Pasi Kärkkäinen <pasik@....fi>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
---
drivers/xen/Kconfig | 2 +-
drivers/xen/Makefile | 2 +-
drivers/xen/processor-harvest.c | 397 --------------------------------------
drivers/xen/processor-passthru.c | 397 ++++++++++++++++++++++++++++++++++++++
4 files changed, 399 insertions(+), 399 deletions(-)
delete mode 100644 drivers/xen/processor-harvest.c
create mode 100644 drivers/xen/processor-passthru.c
diff --git a/drivers/xen/Kconfig b/drivers/xen/Kconfig
index 126183f..af5e062 100644
--- a/drivers/xen/Kconfig
+++ b/drivers/xen/Kconfig
@@ -178,7 +178,7 @@ config XEN_PRIVCMD
depends on XEN
default m
-config XEN_PROCESSOR_HARVEST
+config XEN_PROCESSOR_PASSTHRU
tristate "Processor passthrough driver for Xen"
depends on XEN
depends on ACPI_PROCESSOR
diff --git a/drivers/xen/Makefile b/drivers/xen/Makefile
index 856cfc6..ce235e7a 100644
--- a/drivers/xen/Makefile
+++ b/drivers/xen/Makefile
@@ -20,7 +20,7 @@ obj-$(CONFIG_SWIOTLB_XEN) += swiotlb-xen.o
obj-$(CONFIG_XEN_DOM0) += pci.o
obj-$(CONFIG_XEN_PCIDEV_BACKEND) += xen-pciback/
obj-$(CONFIG_XEN_PRIVCMD) += xen-privcmd.o
-obj-$(CONFIG_XEN_PROCESSOR_HARVEST) += processor-harvest.o
+obj-$(CONFIG_XEN_PROCESSOR_PASSTHRU) += processor-passthru.o
xen-evtchn-y := evtchn.o
xen-gntdev-y := gntdev.o
xen-gntalloc-y := gntalloc.o
diff --git a/drivers/xen/processor-harvest.c b/drivers/xen/processor-harvest.c
deleted file mode 100644
index 50681e2..0000000
--- a/drivers/xen/processor-harvest.c
+++ /dev/null
@@ -1,397 +0,0 @@
-/*
- * Copyright 2012 by Oracle Inc
- * Author: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
- *
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms and conditions of the GNU General Public License,
- * version 2, as published by the Free Software Foundation.
- *
- * This program is distributed in the hope 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.
- *
- */
-
-/*
- * Known limitations
- *
- * The driver can only handle up to for_each_possible_cpu().
- * Meaning if you boot with dom0_max_cpus=X it will _only_ parse up to X
- * processors.
- */
-
-#include <linux/cpumask.h>
-#include <linux/cpufreq.h>
-#include <linux/kernel.h>
-#include <linux/kthread.h>
-#include <linux/init.h>
-#include <linux/module.h>
-#include <linux/types.h>
-#include <acpi/acpi_bus.h>
-#include <acpi/acpi_drivers.h>
-#include <acpi/processor.h>
-
-#include <xen/interface/platform.h>
-#include <asm/xen/hypercall.h>
-
-#define DRV_NAME "processor-passthrough-xen"
-MODULE_AUTHOR("Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>");
-MODULE_DESCRIPTION("ACPI Power Management driver to pass Cx and Pxx data to Xen hypervisor");
-MODULE_LICENSE("GPL");
-
-
-MODULE_PARM_DESC(off, "Inhibit the hypercall.");
-static int no_hypercall;
-module_param_named(off, no_hypercall, int, 0400);
-
-static DEFINE_MUTEX(processors_done_mutex);
-static DECLARE_BITMAP(processors_done, NR_CPUS);
-
-#define POLL_TIMER msecs_to_jiffies(5000 /* 5 sec */)
-static struct task_struct *xen_processor_thread;
-
-static int xen_push_cxx_to_hypervisor(struct acpi_processor *_pr)
-{
- struct xen_platform_op 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 *xen_cx, *xen_cx_states = NULL;
- struct acpi_processor_cx *cx;
- int i, ok, ret = 0;
-
- xen_cx_states = kcalloc(_pr->power.count,
- sizeof(struct xen_processor_cx), GFP_KERNEL);
- if (!xen_cx_states)
- return -ENOMEM;
-
- for (ok = 0, i = 1; i <= _pr->power.count; i++) {
- cx = &_pr->power.states[i];
- if (!cx->valid)
- continue;
-
- xen_cx = &(xen_cx_states[ok++]);
-
- xen_cx->reg.space_id = ACPI_ADR_SPACE_SYSTEM_IO;
- if (cx->entry_method == ACPI_CSTATE_SYSTEMIO) {
- xen_cx->reg.bit_width = 8;
- xen_cx->reg.bit_offset = 0;
- xen_cx->reg.access_size = 1;
- } else {
- xen_cx->reg.space_id = ACPI_ADR_SPACE_FIXED_HARDWARE;
- if (cx->entry_method == ACPI_CSTATE_FFH) {
- /* NATIVE_CSTATE_BEYOND_HALT */
- xen_cx->reg.bit_offset = 2;
- xen_cx->reg.bit_width = 1; /* VENDOR_INTEL */
- }
- xen_cx->reg.access_size = 0;
- }
- xen_cx->reg.address = cx->address;
-
- xen_cx->type = cx->type;
- xen_cx->latency = cx->latency;
- xen_cx->power = cx->power;
-
- xen_cx->dpcnt = 0;
- set_xen_guest_handle(xen_cx->dp, NULL);
-#ifdef DEBUG
- pr_debug(DRV_NAME ": CX: ID:%d [C%d:%s] entry:%d\n", _pr->acpi_id,
- cx->type, cx->desc, cx->entry_method);
-#endif
- }
- if (!ok) {
- pr_err(DRV_NAME ": No available Cx info for cpu %d\n", _pr->acpi_id);
- kfree(xen_cx_states);
- return -EINVAL;
- }
- op.u.set_pminfo.power.count = ok;
- 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, xen_cx_states);
-
- if (!no_hypercall && xen_initial_domain())
- ret = HYPERVISOR_dom0_op(&op);
-
- if (ret) {
- pr_err(DRV_NAME ": Failed to send to hypervisor (rc:%d)\n", ret);
- print_hex_dump_bytes("OP: ", DUMP_PREFIX_NONE, &op,
- sizeof(struct xen_platform_op));
- print_hex_dump_bytes("Cx: ", DUMP_PREFIX_NONE, xen_cx_states,
- _pr->power.count *
- sizeof(struct xen_processor_cx));
- }
- kfree(xen_cx_states);
-
- return ret;
-}
-
-
-
-static struct xen_processor_px *xen_copy_pss_data(struct acpi_processor *_pr,
- struct xen_processor_performance *xen_perf)
-{
- struct xen_processor_px *xen_states = NULL;
- int i;
-
- xen_states = kcalloc(_pr->performance->state_count,
- sizeof(struct xen_processor_px), GFP_KERNEL);
- if (!xen_states)
- return ERR_PTR(-ENOMEM);
-
- xen_perf->state_count = _pr->performance->state_count;
-
- BUILD_BUG_ON(sizeof(struct xen_processor_px) !=
- sizeof(struct acpi_processor_px));
- for (i = 0; i < _pr->performance->state_count; i++) {
-
- /* Fortunatly for us, they both have the same size */
- memcpy(&(xen_states[i]), &(_pr->performance->states[i]),
- sizeof(struct acpi_processor_px));
- }
- return xen_states;
-}
-static int xen_copy_psd_data(struct acpi_processor *_pr,
- struct xen_processor_performance *xen_perf)
-{
- BUILD_BUG_ON(sizeof(struct xen_psd_package) !=
- sizeof(struct acpi_psd_package));
-
- if (_pr->performance->shared_type != CPUFREQ_SHARED_TYPE_NONE) {
- xen_perf->shared_type = _pr->performance->shared_type;
-
- memcpy(&(xen_perf->domain_info), &(_pr->performance->domain_info),
- sizeof(struct acpi_psd_package));
- } else {
- if ((&cpu_data(0))->x86_vendor != X86_VENDOR_AMD)
- return -EINVAL;
-
- /* On AMD, the powernow-k8 is loaded before acpi_cpufreq
- * meaning that acpi_processor_preregister_performance never
- * gets called which would parse the _CST.
- */
- xen_perf->shared_type = CPUFREQ_SHARED_TYPE_ALL;
- xen_perf->domain_info.num_processors = num_online_cpus();
- }
- return 0;
-}
-static int xen_copy_pct_data(struct acpi_pct_register *pct,
- struct xen_pct_register *_pct)
-{
- /* It would be nice if you could just do 'memcpy(pct, _pct') but
- * sadly the Xen structure did not have the proper padding
- * so the descriptor field takes two (_pct) bytes instead of one (pct).
- */
- _pct->descriptor = pct->descriptor;
- _pct->length = pct->length;
- _pct->space_id = pct->space_id;
- _pct->bit_width = pct->bit_width;
- _pct->bit_offset = pct->bit_offset;
- _pct->reserved = pct->reserved;
- _pct->address = pct->address;
- return 0;
-}
-static int xen_push_pxx_to_hypervisor(struct acpi_processor *_pr)
-{
- int ret = 0;
- struct xen_platform_op 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 *xen_perf;
- struct xen_processor_px *xen_states = NULL;
-
- xen_perf = &op.u.set_pminfo.perf;
-
- xen_perf->platform_limit = _pr->performance_platform_limit;
- xen_perf->flags |= XEN_PX_PPC;
- xen_copy_pct_data(&(_pr->performance->control_register),
- &xen_perf->control_register);
- xen_copy_pct_data(&(_pr->performance->status_register),
- &xen_perf->status_register);
- xen_perf->flags |= XEN_PX_PCT;
- xen_states = xen_copy_pss_data(_pr, xen_perf);
- if (!IS_ERR_OR_NULL(xen_states)) {
- set_xen_guest_handle(xen_perf->states, xen_states);
- xen_perf->flags |= XEN_PX_PSS;
- }
- if (!xen_copy_psd_data(_pr, xen_perf))
- xen_perf->flags |= XEN_PX_PSD;
-
- if (!no_hypercall && xen_initial_domain())
- ret = HYPERVISOR_dom0_op(&op);
-
- if (ret) {
- pr_err(DRV_NAME ": Failed to send to hypervisor (rc:%d)\n", ret);
- print_hex_dump_bytes("OP: ", DUMP_PREFIX_NONE, &op,
- sizeof(struct xen_platform_op));
- if (!IS_ERR_OR_NULL(xen_states))
- print_hex_dump_bytes("Pxx:", DUMP_PREFIX_NONE, xen_states,
- _pr->performance->state_count *
- sizeof(struct xen_processor_px));
- }
- if (!IS_ERR_OR_NULL(xen_states))
- kfree(xen_states);
-
- return ret;
-}
-/*
- * We read out the struct acpi_processor, and serialize access
- * so that there is only one caller. This is so that we won't
- * race with the CPU hotplug code.
- */
-static int xen_process_data(struct acpi_processor *_pr, int cpu)
-{
- int err = 0;
-
- mutex_lock(&processors_done_mutex);
- if (cpumask_test_cpu(cpu, to_cpumask(processors_done))) {
- mutex_unlock(&processors_done_mutex);
- return -EBUSY;
- }
- if (_pr->flags.power)
- err = xen_push_cxx_to_hypervisor(_pr);
-
- if (_pr->performance && _pr->performance->states)
- err |= xen_push_pxx_to_hypervisor(_pr);
-
- cpumask_set_cpu(cpu, to_cpumask(processors_done));
- mutex_unlock(&processors_done_mutex);
- return err;
-}
-
-static int xen_processor_check(void)
-{
- struct cpufreq_policy *policy;
- int cpu;
-
- policy = cpufreq_cpu_get(smp_processor_id());
- if (!policy)
- return -EBUSY;
-
- get_online_cpus();
- for_each_online_cpu(cpu) {
- struct acpi_processor *_pr;
-
- _pr = per_cpu(processors, cpu);
- if (!_pr)
- continue;
-
- (void)xen_process_data(_pr, cpu);
- }
- put_online_cpus();
-
- cpufreq_cpu_put(policy);
- return 0;
-}
-/*
- * The purpose of this timer/thread is to wait for the ACPI processor
- * and CPUfreq drivers to load up and parse the Pxx and Cxx information
- * before we attempt to read it.
- */
-static void xen_processor_timeout(unsigned long arg)
-{
- wake_up_process((struct task_struct *)arg);
-}
-static int xen_processor_thread_func(void *dummy)
-{
- struct timer_list timer;
-
- setup_deferrable_timer_on_stack(&timer, xen_processor_timeout,
- (unsigned long)current);
-
- do {
- __set_current_state(TASK_INTERRUPTIBLE);
- mod_timer(&timer, jiffies + POLL_TIMER);
- schedule();
- if (xen_processor_check() != -EBUSY)
- break;
- } while (!kthread_should_stop());
-
- del_timer_sync(&timer);
- destroy_timer_on_stack(&timer);
- return 0;
-}
-
-static int xen_cpu_soft_notify(struct notifier_block *nfb,
- unsigned long action, void *hcpu)
-{
- unsigned int cpu = (unsigned long)hcpu;
- struct acpi_processor *_pr = per_cpu(processors, cpu);
-
- if (action == CPU_ONLINE && _pr)
- (void)xen_process_data(_pr, cpu);
-
- return NOTIFY_OK;
-}
-
-static struct notifier_block xen_cpu_notifier = {
- .notifier_call = xen_cpu_soft_notify,
- .priority = -1, /* Be the last one */
-};
-
-static int __init check_prereq(void)
-{
- struct cpuinfo_x86 *c = &cpu_data(0);
-
- if (!xen_initial_domain())
- return -ENODEV;
-
- if (!acpi_gbl_FADT.smi_command)
- return -ENODEV;
-
- if (c->x86_vendor == X86_VENDOR_INTEL) {
- if (!cpu_has(c, X86_FEATURE_EST))
- return -ENODEV;
-
- return 0;
- }
- if (c->x86_vendor == X86_VENDOR_AMD) {
- u32 hi = 0, lo = 0;
- /* Copied from powernow-k8.h, can't include ../cpufreq/powernow
- * as we get compile warnings for the static functions.
- */
-#define MSR_PSTATE_CUR_LIMIT 0xc0010061 /* pstate current limit MSR */
- rdmsr(MSR_PSTATE_CUR_LIMIT, lo, hi);
-
- /* If the MSR cannot provide the data, the powernow-k8
- * won't process the data properly either.
- */
- if (hi || lo)
- return 0;
- }
- return -ENODEV;
-}
-
-static int __init xen_processor_passthrough_init(void)
-{
- int rc = check_prereq();
-
- if (rc)
- return rc;
-
- xen_processor_thread = kthread_run(xen_processor_thread_func, NULL, DRV_NAME);
- if (IS_ERR(xen_processor_thread)) {
- pr_err(DRV_NAME ": Failed to create thread. Aborting.\n");
- return -ENOMEM;
- }
- register_hotcpu_notifier(&xen_cpu_notifier);
- return 0;
-}
-static void __exit xen_processor_passthrough_exit(void)
-{
- unregister_hotcpu_notifier(&xen_cpu_notifier);
- if (xen_processor_thread)
- kthread_stop(xen_processor_thread);
-}
-late_initcall(xen_processor_passthrough_init);
-module_exit(xen_processor_passthrough_exit);
diff --git a/drivers/xen/processor-passthru.c b/drivers/xen/processor-passthru.c
new file mode 100644
index 0000000..abfcbe4
--- /dev/null
+++ b/drivers/xen/processor-passthru.c
@@ -0,0 +1,397 @@
+/*
+ * Copyright 2012 by Oracle Inc
+ * Author: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
+ *
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope 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.
+ *
+ */
+
+/*
+ * Known limitations
+ *
+ * The driver can only handle up to for_each_possible_cpu().
+ * Meaning if you boot with dom0_max_cpus=X it will _only_ parse up to X
+ * processors.
+ */
+
+#include <linux/cpumask.h>
+#include <linux/cpufreq.h>
+#include <linux/kernel.h>
+#include <linux/kthread.h>
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/types.h>
+#include <acpi/acpi_bus.h>
+#include <acpi/acpi_drivers.h>
+#include <acpi/processor.h>
+
+#include <xen/interface/platform.h>
+#include <asm/xen/hypercall.h>
+
+#define DRV_NAME "xen-processor-thru"
+MODULE_AUTHOR("Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>");
+MODULE_DESCRIPTION("ACPI Power Management driver to pass Cx and Pxx data to Xen hypervisor");
+MODULE_LICENSE("GPL");
+
+
+MODULE_PARM_DESC(off, "Inhibit the hypercall.");
+static int no_hypercall;
+module_param_named(off, no_hypercall, int, 0400);
+
+static DEFINE_MUTEX(processors_done_mutex);
+static DECLARE_BITMAP(processors_done, NR_CPUS);
+
+#define POLL_TIMER msecs_to_jiffies(5000 /* 5 sec */)
+static struct task_struct *xen_processor_thread;
+
+static int xen_push_cxx_to_hypervisor(struct acpi_processor *_pr)
+{
+ struct xen_platform_op 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 *xen_cx, *xen_cx_states = NULL;
+ struct acpi_processor_cx *cx;
+ int i, ok, ret = 0;
+
+ xen_cx_states = kcalloc(_pr->power.count,
+ sizeof(struct xen_processor_cx), GFP_KERNEL);
+ if (!xen_cx_states)
+ return -ENOMEM;
+
+ for (ok = 0, i = 1; i <= _pr->power.count; i++) {
+ cx = &_pr->power.states[i];
+ if (!cx->valid)
+ continue;
+
+ xen_cx = &(xen_cx_states[ok++]);
+
+ xen_cx->reg.space_id = ACPI_ADR_SPACE_SYSTEM_IO;
+ if (cx->entry_method == ACPI_CSTATE_SYSTEMIO) {
+ xen_cx->reg.bit_width = 8;
+ xen_cx->reg.bit_offset = 0;
+ xen_cx->reg.access_size = 1;
+ } else {
+ xen_cx->reg.space_id = ACPI_ADR_SPACE_FIXED_HARDWARE;
+ if (cx->entry_method == ACPI_CSTATE_FFH) {
+ /* NATIVE_CSTATE_BEYOND_HALT */
+ xen_cx->reg.bit_offset = 2;
+ xen_cx->reg.bit_width = 1; /* VENDOR_INTEL */
+ }
+ xen_cx->reg.access_size = 0;
+ }
+ xen_cx->reg.address = cx->address;
+
+ xen_cx->type = cx->type;
+ xen_cx->latency = cx->latency;
+ xen_cx->power = cx->power;
+
+ xen_cx->dpcnt = 0;
+ set_xen_guest_handle(xen_cx->dp, NULL);
+#ifdef DEBUG
+ pr_debug(DRV_NAME ": CX: ID:%d [C%d:%s] entry:%d\n", _pr->acpi_id,
+ cx->type, cx->desc, cx->entry_method);
+#endif
+ }
+ if (!ok) {
+ pr_err(DRV_NAME ": No available Cx info for cpu %d\n", _pr->acpi_id);
+ kfree(xen_cx_states);
+ return -EINVAL;
+ }
+ op.u.set_pminfo.power.count = ok;
+ 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, xen_cx_states);
+
+ if (!no_hypercall && xen_initial_domain())
+ ret = HYPERVISOR_dom0_op(&op);
+
+ if (ret) {
+ pr_err(DRV_NAME ": Failed to send to hypervisor (rc:%d)\n", ret);
+ print_hex_dump_bytes("OP: ", DUMP_PREFIX_NONE, &op,
+ sizeof(struct xen_platform_op));
+ print_hex_dump_bytes("Cx: ", DUMP_PREFIX_NONE, xen_cx_states,
+ _pr->power.count *
+ sizeof(struct xen_processor_cx));
+ }
+ kfree(xen_cx_states);
+
+ return ret;
+}
+
+
+
+static struct xen_processor_px *xen_copy_pss_data(struct acpi_processor *_pr,
+ struct xen_processor_performance *xen_perf)
+{
+ struct xen_processor_px *xen_states = NULL;
+ int i;
+
+ xen_states = kcalloc(_pr->performance->state_count,
+ sizeof(struct xen_processor_px), GFP_KERNEL);
+ if (!xen_states)
+ return ERR_PTR(-ENOMEM);
+
+ xen_perf->state_count = _pr->performance->state_count;
+
+ BUILD_BUG_ON(sizeof(struct xen_processor_px) !=
+ sizeof(struct acpi_processor_px));
+ for (i = 0; i < _pr->performance->state_count; i++) {
+
+ /* Fortunatly for us, they both have the same size */
+ memcpy(&(xen_states[i]), &(_pr->performance->states[i]),
+ sizeof(struct acpi_processor_px));
+ }
+ return xen_states;
+}
+static int xen_copy_psd_data(struct acpi_processor *_pr,
+ struct xen_processor_performance *xen_perf)
+{
+ BUILD_BUG_ON(sizeof(struct xen_psd_package) !=
+ sizeof(struct acpi_psd_package));
+
+ if (_pr->performance->shared_type != CPUFREQ_SHARED_TYPE_NONE) {
+ xen_perf->shared_type = _pr->performance->shared_type;
+
+ memcpy(&(xen_perf->domain_info), &(_pr->performance->domain_info),
+ sizeof(struct acpi_psd_package));
+ } else {
+ if ((&cpu_data(0))->x86_vendor != X86_VENDOR_AMD)
+ return -EINVAL;
+
+ /* On AMD, the powernow-k8 is loaded before acpi_cpufreq
+ * meaning that acpi_processor_preregister_performance never
+ * gets called which would parse the _CST.
+ */
+ xen_perf->shared_type = CPUFREQ_SHARED_TYPE_ALL;
+ xen_perf->domain_info.num_processors = num_online_cpus();
+ }
+ return 0;
+}
+static int xen_copy_pct_data(struct acpi_pct_register *pct,
+ struct xen_pct_register *_pct)
+{
+ /* It would be nice if you could just do 'memcpy(pct, _pct') but
+ * sadly the Xen structure did not have the proper padding
+ * so the descriptor field takes two (_pct) bytes instead of one (pct).
+ */
+ _pct->descriptor = pct->descriptor;
+ _pct->length = pct->length;
+ _pct->space_id = pct->space_id;
+ _pct->bit_width = pct->bit_width;
+ _pct->bit_offset = pct->bit_offset;
+ _pct->reserved = pct->reserved;
+ _pct->address = pct->address;
+ return 0;
+}
+static int xen_push_pxx_to_hypervisor(struct acpi_processor *_pr)
+{
+ int ret = 0;
+ struct xen_platform_op 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 *xen_perf;
+ struct xen_processor_px *xen_states = NULL;
+
+ xen_perf = &op.u.set_pminfo.perf;
+
+ xen_perf->platform_limit = _pr->performance_platform_limit;
+ xen_perf->flags |= XEN_PX_PPC;
+ xen_copy_pct_data(&(_pr->performance->control_register),
+ &xen_perf->control_register);
+ xen_copy_pct_data(&(_pr->performance->status_register),
+ &xen_perf->status_register);
+ xen_perf->flags |= XEN_PX_PCT;
+ xen_states = xen_copy_pss_data(_pr, xen_perf);
+ if (!IS_ERR_OR_NULL(xen_states)) {
+ set_xen_guest_handle(xen_perf->states, xen_states);
+ xen_perf->flags |= XEN_PX_PSS;
+ }
+ if (!xen_copy_psd_data(_pr, xen_perf))
+ xen_perf->flags |= XEN_PX_PSD;
+
+ if (!no_hypercall && xen_initial_domain())
+ ret = HYPERVISOR_dom0_op(&op);
+
+ if (ret) {
+ pr_err(DRV_NAME ": Failed to send to hypervisor (rc:%d)\n", ret);
+ print_hex_dump_bytes("OP: ", DUMP_PREFIX_NONE, &op,
+ sizeof(struct xen_platform_op));
+ if (!IS_ERR_OR_NULL(xen_states))
+ print_hex_dump_bytes("Pxx:", DUMP_PREFIX_NONE, xen_states,
+ _pr->performance->state_count *
+ sizeof(struct xen_processor_px));
+ }
+ if (!IS_ERR_OR_NULL(xen_states))
+ kfree(xen_states);
+
+ return ret;
+}
+/*
+ * We read out the struct acpi_processor, and serialize access
+ * so that there is only one caller. This is so that we won't
+ * race with the CPU hotplug code.
+ */
+static int xen_process_data(struct acpi_processor *_pr, int cpu)
+{
+ int err = 0;
+
+ mutex_lock(&processors_done_mutex);
+ if (cpumask_test_cpu(cpu, to_cpumask(processors_done))) {
+ mutex_unlock(&processors_done_mutex);
+ return -EBUSY;
+ }
+ if (_pr->flags.power)
+ err = xen_push_cxx_to_hypervisor(_pr);
+
+ if (_pr->performance && _pr->performance->states)
+ err |= xen_push_pxx_to_hypervisor(_pr);
+
+ cpumask_set_cpu(cpu, to_cpumask(processors_done));
+ mutex_unlock(&processors_done_mutex);
+ return err;
+}
+
+static int xen_processor_check(void)
+{
+ struct cpufreq_policy *policy;
+ int cpu;
+
+ policy = cpufreq_cpu_get(smp_processor_id());
+ if (!policy)
+ return -EBUSY;
+
+ get_online_cpus();
+ for_each_online_cpu(cpu) {
+ struct acpi_processor *_pr;
+
+ _pr = per_cpu(processors, cpu);
+ if (!_pr)
+ continue;
+
+ (void)xen_process_data(_pr, cpu);
+ }
+ put_online_cpus();
+
+ cpufreq_cpu_put(policy);
+ return 0;
+}
+/*
+ * The purpose of this timer/thread is to wait for the ACPI processor
+ * and CPUfreq drivers to load up and parse the Pxx and Cxx information
+ * before we attempt to read it.
+ */
+static void xen_processor_timeout(unsigned long arg)
+{
+ wake_up_process((struct task_struct *)arg);
+}
+static int xen_processor_thread_func(void *dummy)
+{
+ struct timer_list timer;
+
+ setup_deferrable_timer_on_stack(&timer, xen_processor_timeout,
+ (unsigned long)current);
+
+ do {
+ __set_current_state(TASK_INTERRUPTIBLE);
+ mod_timer(&timer, jiffies + POLL_TIMER);
+ schedule();
+ if (xen_processor_check() != -EBUSY)
+ break;
+ } while (!kthread_should_stop());
+
+ del_timer_sync(&timer);
+ destroy_timer_on_stack(&timer);
+ return 0;
+}
+
+static int xen_cpu_soft_notify(struct notifier_block *nfb,
+ unsigned long action, void *hcpu)
+{
+ unsigned int cpu = (unsigned long)hcpu;
+ struct acpi_processor *_pr = per_cpu(processors, cpu);
+
+ if (action == CPU_ONLINE && _pr)
+ (void)xen_process_data(_pr, cpu);
+
+ return NOTIFY_OK;
+}
+
+static struct notifier_block xen_cpu_notifier = {
+ .notifier_call = xen_cpu_soft_notify,
+ .priority = -1, /* Be the last one */
+};
+
+static int __init check_prereq(void)
+{
+ struct cpuinfo_x86 *c = &cpu_data(0);
+
+ if (!xen_initial_domain())
+ return -ENODEV;
+
+ if (!acpi_gbl_FADT.smi_command)
+ return -ENODEV;
+
+ if (c->x86_vendor == X86_VENDOR_INTEL) {
+ if (!cpu_has(c, X86_FEATURE_EST))
+ return -ENODEV;
+
+ return 0;
+ }
+ if (c->x86_vendor == X86_VENDOR_AMD) {
+ u32 hi = 0, lo = 0;
+ /* Copied from powernow-k8.h, can't include ../cpufreq/powernow
+ * as we get compile warnings for the static functions.
+ */
+#define MSR_PSTATE_CUR_LIMIT 0xc0010061 /* pstate current limit MSR */
+ rdmsr(MSR_PSTATE_CUR_LIMIT, lo, hi);
+
+ /* If the MSR cannot provide the data, the powernow-k8
+ * won't process the data properly either.
+ */
+ if (hi || lo)
+ return 0;
+ }
+ return -ENODEV;
+}
+
+static int __init xen_processor_passthru_init(void)
+{
+ int rc = check_prereq();
+
+ if (rc)
+ return rc;
+
+ xen_processor_thread = kthread_run(xen_processor_thread_func, NULL, DRV_NAME);
+ if (IS_ERR(xen_processor_thread)) {
+ pr_err(DRV_NAME ": Failed to create thread. Aborting.\n");
+ return -ENOMEM;
+ }
+ register_hotcpu_notifier(&xen_cpu_notifier);
+ return 0;
+}
+static void __exit xen_processor_passthru_exit(void)
+{
+ unregister_hotcpu_notifier(&xen_cpu_notifier);
+ if (xen_processor_thread)
+ kthread_stop(xen_processor_thread);
+}
+late_initcall(xen_processor_passthru_init);
+module_exit(xen_processor_passthru_exit);
--
1.7.7.5
--
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