forked from luck/tmp_suning_uos_patched
631e63a9f3
Make the event handling tasklet per channel rather than per-cpu. This allows for better fairness when getting lots of data on the same cpu. Signed-off-by: Stephen Hemminger <sthemmin@microsoft.com> Signed-off-by: K. Y. Srinivasan <kys@microsoft.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
390 lines
9.9 KiB
C
390 lines
9.9 KiB
C
/*
|
|
* Copyright (c) 2009, Microsoft Corporation.
|
|
*
|
|
* 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.
|
|
*
|
|
* 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.
|
|
*
|
|
* Authors:
|
|
* Haiyang Zhang <haiyangz@microsoft.com>
|
|
* Hank Janssen <hjanssen@microsoft.com>
|
|
*
|
|
*/
|
|
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
|
|
|
|
#include <linux/kernel.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/vmalloc.h>
|
|
#include <linux/hyperv.h>
|
|
#include <linux/version.h>
|
|
#include <linux/interrupt.h>
|
|
#include <linux/clockchips.h>
|
|
#include <asm/hyperv.h>
|
|
#include <asm/mshyperv.h>
|
|
#include "hyperv_vmbus.h"
|
|
|
|
/* The one and only */
|
|
struct hv_context hv_context = {
|
|
.synic_initialized = false,
|
|
};
|
|
|
|
#define HV_TIMER_FREQUENCY (10 * 1000 * 1000) /* 100ns period */
|
|
#define HV_MAX_MAX_DELTA_TICKS 0xffffffff
|
|
#define HV_MIN_DELTA_TICKS 1
|
|
|
|
/*
|
|
* hv_init - Main initialization routine.
|
|
*
|
|
* This routine must be called before any other routines in here are called
|
|
*/
|
|
int hv_init(void)
|
|
{
|
|
if (!hv_is_hypercall_page_setup())
|
|
return -ENOTSUPP;
|
|
|
|
hv_context.cpu_context = alloc_percpu(struct hv_per_cpu_context);
|
|
if (!hv_context.cpu_context)
|
|
return -ENOMEM;
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* hv_post_message - Post a message using the hypervisor message IPC.
|
|
*
|
|
* This involves a hypercall.
|
|
*/
|
|
int hv_post_message(union hv_connection_id connection_id,
|
|
enum hv_message_type message_type,
|
|
void *payload, size_t payload_size)
|
|
{
|
|
struct hv_input_post_message *aligned_msg;
|
|
struct hv_per_cpu_context *hv_cpu;
|
|
u64 status;
|
|
|
|
if (payload_size > HV_MESSAGE_PAYLOAD_BYTE_COUNT)
|
|
return -EMSGSIZE;
|
|
|
|
hv_cpu = get_cpu_ptr(hv_context.cpu_context);
|
|
aligned_msg = hv_cpu->post_msg_page;
|
|
aligned_msg->connectionid = connection_id;
|
|
aligned_msg->reserved = 0;
|
|
aligned_msg->message_type = message_type;
|
|
aligned_msg->payload_size = payload_size;
|
|
memcpy((void *)aligned_msg->payload, payload, payload_size);
|
|
put_cpu_ptr(hv_cpu);
|
|
|
|
status = hv_do_hypercall(HVCALL_POST_MESSAGE, aligned_msg, NULL);
|
|
|
|
return status & 0xFFFF;
|
|
}
|
|
|
|
static int hv_ce_set_next_event(unsigned long delta,
|
|
struct clock_event_device *evt)
|
|
{
|
|
u64 current_tick;
|
|
|
|
WARN_ON(!clockevent_state_oneshot(evt));
|
|
|
|
hv_get_current_tick(current_tick);
|
|
current_tick += delta;
|
|
hv_init_timer(HV_X64_MSR_STIMER0_COUNT, current_tick);
|
|
return 0;
|
|
}
|
|
|
|
static int hv_ce_shutdown(struct clock_event_device *evt)
|
|
{
|
|
hv_init_timer(HV_X64_MSR_STIMER0_COUNT, 0);
|
|
hv_init_timer_config(HV_X64_MSR_STIMER0_CONFIG, 0);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int hv_ce_set_oneshot(struct clock_event_device *evt)
|
|
{
|
|
union hv_timer_config timer_cfg;
|
|
|
|
timer_cfg.enable = 1;
|
|
timer_cfg.auto_enable = 1;
|
|
timer_cfg.sintx = VMBUS_MESSAGE_SINT;
|
|
hv_init_timer_config(HV_X64_MSR_STIMER0_CONFIG, timer_cfg.as_uint64);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void hv_init_clockevent_device(struct clock_event_device *dev, int cpu)
|
|
{
|
|
dev->name = "Hyper-V clockevent";
|
|
dev->features = CLOCK_EVT_FEAT_ONESHOT;
|
|
dev->cpumask = cpumask_of(cpu);
|
|
dev->rating = 1000;
|
|
/*
|
|
* Avoid settint dev->owner = THIS_MODULE deliberately as doing so will
|
|
* result in clockevents_config_and_register() taking additional
|
|
* references to the hv_vmbus module making it impossible to unload.
|
|
*/
|
|
|
|
dev->set_state_shutdown = hv_ce_shutdown;
|
|
dev->set_state_oneshot = hv_ce_set_oneshot;
|
|
dev->set_next_event = hv_ce_set_next_event;
|
|
}
|
|
|
|
|
|
int hv_synic_alloc(void)
|
|
{
|
|
int cpu;
|
|
|
|
hv_context.hv_numa_map = kzalloc(sizeof(struct cpumask) * nr_node_ids,
|
|
GFP_ATOMIC);
|
|
if (hv_context.hv_numa_map == NULL) {
|
|
pr_err("Unable to allocate NUMA map\n");
|
|
goto err;
|
|
}
|
|
|
|
for_each_present_cpu(cpu) {
|
|
struct hv_per_cpu_context *hv_cpu
|
|
= per_cpu_ptr(hv_context.cpu_context, cpu);
|
|
|
|
memset(hv_cpu, 0, sizeof(*hv_cpu));
|
|
tasklet_init(&hv_cpu->msg_dpc,
|
|
vmbus_on_msg_dpc, (unsigned long) hv_cpu);
|
|
|
|
hv_cpu->clk_evt = kzalloc(sizeof(struct clock_event_device),
|
|
GFP_KERNEL);
|
|
if (hv_cpu->clk_evt == NULL) {
|
|
pr_err("Unable to allocate clock event device\n");
|
|
goto err;
|
|
}
|
|
hv_init_clockevent_device(hv_cpu->clk_evt, cpu);
|
|
|
|
hv_cpu->synic_message_page =
|
|
(void *)get_zeroed_page(GFP_ATOMIC);
|
|
if (hv_cpu->synic_message_page == NULL) {
|
|
pr_err("Unable to allocate SYNIC message page\n");
|
|
goto err;
|
|
}
|
|
|
|
hv_cpu->synic_event_page = (void *)get_zeroed_page(GFP_ATOMIC);
|
|
if (hv_cpu->synic_event_page == NULL) {
|
|
pr_err("Unable to allocate SYNIC event page\n");
|
|
goto err;
|
|
}
|
|
|
|
hv_cpu->post_msg_page = (void *)get_zeroed_page(GFP_ATOMIC);
|
|
if (hv_cpu->post_msg_page == NULL) {
|
|
pr_err("Unable to allocate post msg page\n");
|
|
goto err;
|
|
}
|
|
|
|
INIT_LIST_HEAD(&hv_cpu->chan_list);
|
|
}
|
|
|
|
return 0;
|
|
err:
|
|
return -ENOMEM;
|
|
}
|
|
|
|
|
|
void hv_synic_free(void)
|
|
{
|
|
int cpu;
|
|
|
|
for_each_present_cpu(cpu) {
|
|
struct hv_per_cpu_context *hv_cpu
|
|
= per_cpu_ptr(hv_context.cpu_context, cpu);
|
|
|
|
if (hv_cpu->synic_event_page)
|
|
free_page((unsigned long)hv_cpu->synic_event_page);
|
|
if (hv_cpu->synic_message_page)
|
|
free_page((unsigned long)hv_cpu->synic_message_page);
|
|
if (hv_cpu->post_msg_page)
|
|
free_page((unsigned long)hv_cpu->post_msg_page);
|
|
}
|
|
|
|
kfree(hv_context.hv_numa_map);
|
|
}
|
|
|
|
/*
|
|
* hv_synic_init - Initialize the Synthethic Interrupt Controller.
|
|
*
|
|
* If it is already initialized by another entity (ie x2v shim), we need to
|
|
* retrieve the initialized message and event pages. Otherwise, we create and
|
|
* initialize the message and event pages.
|
|
*/
|
|
int hv_synic_init(unsigned int cpu)
|
|
{
|
|
struct hv_per_cpu_context *hv_cpu
|
|
= per_cpu_ptr(hv_context.cpu_context, cpu);
|
|
union hv_synic_simp simp;
|
|
union hv_synic_siefp siefp;
|
|
union hv_synic_sint shared_sint;
|
|
union hv_synic_scontrol sctrl;
|
|
u64 vp_index;
|
|
|
|
/* Setup the Synic's message page */
|
|
hv_get_simp(simp.as_uint64);
|
|
simp.simp_enabled = 1;
|
|
simp.base_simp_gpa = virt_to_phys(hv_cpu->synic_message_page)
|
|
>> PAGE_SHIFT;
|
|
|
|
hv_set_simp(simp.as_uint64);
|
|
|
|
/* Setup the Synic's event page */
|
|
hv_get_siefp(siefp.as_uint64);
|
|
siefp.siefp_enabled = 1;
|
|
siefp.base_siefp_gpa = virt_to_phys(hv_cpu->synic_event_page)
|
|
>> PAGE_SHIFT;
|
|
|
|
hv_set_siefp(siefp.as_uint64);
|
|
|
|
/* Setup the shared SINT. */
|
|
hv_get_synint_state(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT,
|
|
shared_sint.as_uint64);
|
|
|
|
shared_sint.as_uint64 = 0;
|
|
shared_sint.vector = HYPERVISOR_CALLBACK_VECTOR;
|
|
shared_sint.masked = false;
|
|
shared_sint.auto_eoi = true;
|
|
|
|
hv_set_synint_state(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT,
|
|
shared_sint.as_uint64);
|
|
|
|
/* Enable the global synic bit */
|
|
hv_get_synic_state(sctrl.as_uint64);
|
|
sctrl.enable = 1;
|
|
|
|
hv_set_synic_state(sctrl.as_uint64);
|
|
|
|
hv_context.synic_initialized = true;
|
|
|
|
/*
|
|
* Setup the mapping between Hyper-V's notion
|
|
* of cpuid and Linux' notion of cpuid.
|
|
* This array will be indexed using Linux cpuid.
|
|
*/
|
|
hv_get_vp_index(vp_index);
|
|
hv_context.vp_index[cpu] = (u32)vp_index;
|
|
|
|
/*
|
|
* Register the per-cpu clockevent source.
|
|
*/
|
|
if (ms_hyperv.features & HV_X64_MSR_SYNTIMER_AVAILABLE)
|
|
clockevents_config_and_register(hv_cpu->clk_evt,
|
|
HV_TIMER_FREQUENCY,
|
|
HV_MIN_DELTA_TICKS,
|
|
HV_MAX_MAX_DELTA_TICKS);
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* hv_synic_clockevents_cleanup - Cleanup clockevent devices
|
|
*/
|
|
void hv_synic_clockevents_cleanup(void)
|
|
{
|
|
int cpu;
|
|
|
|
if (!(ms_hyperv.features & HV_X64_MSR_SYNTIMER_AVAILABLE))
|
|
return;
|
|
|
|
for_each_present_cpu(cpu) {
|
|
struct hv_per_cpu_context *hv_cpu
|
|
= per_cpu_ptr(hv_context.cpu_context, cpu);
|
|
|
|
clockevents_unbind_device(hv_cpu->clk_evt, cpu);
|
|
}
|
|
}
|
|
|
|
/*
|
|
* hv_synic_cleanup - Cleanup routine for hv_synic_init().
|
|
*/
|
|
int hv_synic_cleanup(unsigned int cpu)
|
|
{
|
|
union hv_synic_sint shared_sint;
|
|
union hv_synic_simp simp;
|
|
union hv_synic_siefp siefp;
|
|
union hv_synic_scontrol sctrl;
|
|
struct vmbus_channel *channel, *sc;
|
|
bool channel_found = false;
|
|
unsigned long flags;
|
|
|
|
if (!hv_context.synic_initialized)
|
|
return -EFAULT;
|
|
|
|
/*
|
|
* Search for channels which are bound to the CPU we're about to
|
|
* cleanup. In case we find one and vmbus is still connected we need to
|
|
* fail, this will effectively prevent CPU offlining. There is no way
|
|
* we can re-bind channels to different CPUs for now.
|
|
*/
|
|
mutex_lock(&vmbus_connection.channel_mutex);
|
|
list_for_each_entry(channel, &vmbus_connection.chn_list, listentry) {
|
|
if (channel->target_cpu == cpu) {
|
|
channel_found = true;
|
|
break;
|
|
}
|
|
spin_lock_irqsave(&channel->lock, flags);
|
|
list_for_each_entry(sc, &channel->sc_list, sc_list) {
|
|
if (sc->target_cpu == cpu) {
|
|
channel_found = true;
|
|
break;
|
|
}
|
|
}
|
|
spin_unlock_irqrestore(&channel->lock, flags);
|
|
if (channel_found)
|
|
break;
|
|
}
|
|
mutex_unlock(&vmbus_connection.channel_mutex);
|
|
|
|
if (channel_found && vmbus_connection.conn_state == CONNECTED)
|
|
return -EBUSY;
|
|
|
|
/* Turn off clockevent device */
|
|
if (ms_hyperv.features & HV_X64_MSR_SYNTIMER_AVAILABLE) {
|
|
struct hv_per_cpu_context *hv_cpu
|
|
= this_cpu_ptr(hv_context.cpu_context);
|
|
|
|
clockevents_unbind_device(hv_cpu->clk_evt, cpu);
|
|
hv_ce_shutdown(hv_cpu->clk_evt);
|
|
put_cpu_ptr(hv_cpu);
|
|
}
|
|
|
|
hv_get_synint_state(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT,
|
|
shared_sint.as_uint64);
|
|
|
|
shared_sint.masked = 1;
|
|
|
|
/* Need to correctly cleanup in the case of SMP!!! */
|
|
/* Disable the interrupt */
|
|
hv_set_synint_state(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT,
|
|
shared_sint.as_uint64);
|
|
|
|
hv_get_simp(simp.as_uint64);
|
|
simp.simp_enabled = 0;
|
|
simp.base_simp_gpa = 0;
|
|
|
|
hv_set_simp(simp.as_uint64);
|
|
|
|
hv_get_siefp(siefp.as_uint64);
|
|
siefp.siefp_enabled = 0;
|
|
siefp.base_siefp_gpa = 0;
|
|
|
|
hv_set_siefp(siefp.as_uint64);
|
|
|
|
/* Disable the global synic bit */
|
|
hv_get_synic_state(sctrl.as_uint64);
|
|
sctrl.enable = 0;
|
|
hv_set_synic_state(sctrl.as_uint64);
|
|
|
|
return 0;
|
|
}
|