mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-12 13:55:32 +00:00
![Michael Kelley](/assets/img/avatar_default.png)
On ARM64, Hyper-V now specifies the interrupt to be used by VMbus in the ACPI DSDT. This information is not used on x86 because the interrupt vector must be hardcoded. But update the generic VMbus driver to do the parsing and pass the information to the architecture specific code that sets up the Linux IRQ. Update consumers of the interrupt to get it from an architecture specific function. Signed-off-by: Michael Kelley <mikelley@microsoft.com> Link: https://lore.kernel.org/r/1597434304-40631-1-git-send-email-mikelley@microsoft.com Signed-off-by: Wei Liu <wei.liu@kernel.org>
284 lines
6.9 KiB
C
284 lines
6.9 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Copyright (c) 2009, Microsoft Corporation.
|
|
*
|
|
* 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/random.h>
|
|
#include <linux/clockchips.h>
|
|
#include <clocksource/hyperv_timer.h>
|
|
#include <asm/mshyperv.h>
|
|
#include "hyperv_vmbus.h"
|
|
|
|
/* The one and only */
|
|
struct hv_context hv_context;
|
|
|
|
/*
|
|
* hv_init - Main initialization routine.
|
|
*
|
|
* This routine must be called before any other routines in here are called
|
|
*/
|
|
int hv_init(void)
|
|
{
|
|
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);
|
|
|
|
status = hv_do_hypercall(HVCALL_POST_MESSAGE, aligned_msg, NULL);
|
|
|
|
/* Preemption must remain disabled until after the hypercall
|
|
* so some other thread can't get scheduled onto this cpu and
|
|
* corrupt the per-cpu post_msg_page
|
|
*/
|
|
put_cpu_ptr(hv_cpu);
|
|
|
|
return status & 0xFFFF;
|
|
}
|
|
|
|
int hv_synic_alloc(void)
|
|
{
|
|
int cpu;
|
|
struct hv_per_cpu_context *hv_cpu;
|
|
|
|
/*
|
|
* First, zero all per-cpu memory areas so hv_synic_free() can
|
|
* detect what memory has been allocated and cleanup properly
|
|
* after any failures.
|
|
*/
|
|
for_each_present_cpu(cpu) {
|
|
hv_cpu = per_cpu_ptr(hv_context.cpu_context, cpu);
|
|
memset(hv_cpu, 0, sizeof(*hv_cpu));
|
|
}
|
|
|
|
hv_context.hv_numa_map = kcalloc(nr_node_ids, sizeof(struct cpumask),
|
|
GFP_KERNEL);
|
|
if (hv_context.hv_numa_map == NULL) {
|
|
pr_err("Unable to allocate NUMA map\n");
|
|
goto err;
|
|
}
|
|
|
|
for_each_present_cpu(cpu) {
|
|
hv_cpu = per_cpu_ptr(hv_context.cpu_context, cpu);
|
|
|
|
tasklet_init(&hv_cpu->msg_dpc,
|
|
vmbus_on_msg_dpc, (unsigned long) hv_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;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
err:
|
|
/*
|
|
* Any memory allocations that succeeded will be freed when
|
|
* the caller cleans up by calling hv_synic_free()
|
|
*/
|
|
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);
|
|
|
|
free_page((unsigned long)hv_cpu->synic_event_page);
|
|
free_page((unsigned long)hv_cpu->synic_message_page);
|
|
free_page((unsigned long)hv_cpu->post_msg_page);
|
|
}
|
|
|
|
kfree(hv_context.hv_numa_map);
|
|
}
|
|
|
|
/*
|
|
* hv_synic_init - Initialize the Synthetic 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.
|
|
*/
|
|
void hv_synic_enable_regs(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;
|
|
|
|
/* 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)
|
|
>> HV_HYP_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)
|
|
>> HV_HYP_PAGE_SHIFT;
|
|
|
|
hv_set_siefp(siefp.as_uint64);
|
|
|
|
/* Setup the shared SINT. */
|
|
hv_get_synint_state(VMBUS_MESSAGE_SINT, shared_sint.as_uint64);
|
|
|
|
shared_sint.vector = hv_get_vector();
|
|
shared_sint.masked = false;
|
|
shared_sint.auto_eoi = hv_recommend_using_aeoi();
|
|
hv_set_synint_state(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);
|
|
}
|
|
|
|
int hv_synic_init(unsigned int cpu)
|
|
{
|
|
hv_synic_enable_regs(cpu);
|
|
|
|
hv_stimer_legacy_init(cpu, VMBUS_MESSAGE_SINT);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* hv_synic_cleanup - Cleanup routine for hv_synic_init().
|
|
*/
|
|
void hv_synic_disable_regs(unsigned int cpu)
|
|
{
|
|
union hv_synic_sint shared_sint;
|
|
union hv_synic_simp simp;
|
|
union hv_synic_siefp siefp;
|
|
union hv_synic_scontrol sctrl;
|
|
|
|
hv_get_synint_state(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(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);
|
|
}
|
|
|
|
int hv_synic_cleanup(unsigned int cpu)
|
|
{
|
|
struct vmbus_channel *channel, *sc;
|
|
bool channel_found = false;
|
|
|
|
/*
|
|
* Hyper-V does not provide a way to change the connect CPU once
|
|
* it is set; we must prevent the connect CPU from going offline.
|
|
*/
|
|
if (cpu == VMBUS_CONNECT_CPU)
|
|
return -EBUSY;
|
|
|
|
/*
|
|
* 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
|
|
* fail; this will effectively prevent CPU offlining.
|
|
*
|
|
* TODO: Re-bind the channels to different CPUs.
|
|
*/
|
|
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;
|
|
}
|
|
list_for_each_entry(sc, &channel->sc_list, sc_list) {
|
|
if (sc->target_cpu == cpu) {
|
|
channel_found = true;
|
|
break;
|
|
}
|
|
}
|
|
if (channel_found)
|
|
break;
|
|
}
|
|
mutex_unlock(&vmbus_connection.channel_mutex);
|
|
|
|
if (channel_found && vmbus_connection.conn_state == CONNECTED)
|
|
return -EBUSY;
|
|
|
|
hv_stimer_legacy_cleanup(cpu);
|
|
|
|
hv_synic_disable_regs(cpu);
|
|
|
|
return 0;
|
|
}
|