mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-06 13:46:39 +07:00
fd1fea6834
Hyper-V clock/timer code and data structures are currently mixed in with other code in the ISA independent drivers/hv directory as well as the ISA dependent Hyper-V code under arch/x86. Consolidate this code and data structures into a Hyper-V clocksource driver to better follow the Linux model. In doing so, separate out the ISA dependent portions so the new clocksource driver works for x86 and for the in-process Hyper-V on ARM64 code. To start, move the existing clockevents code to create the new clocksource driver. Update the VMbus driver to call initialization and cleanup routines since the Hyper-V synthetic timers are not independently enumerated in ACPI. No behavior is changed and no new functionality is added. Suggested-by: Marc Zyngier <marc.zyngier@arm.com> Signed-off-by: Michael Kelley <mikelley@microsoft.com> Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com> Cc: "bp@alien8.de" <bp@alien8.de> Cc: "will.deacon@arm.com" <will.deacon@arm.com> Cc: "catalin.marinas@arm.com" <catalin.marinas@arm.com> Cc: "mark.rutland@arm.com" <mark.rutland@arm.com> Cc: "linux-arm-kernel@lists.infradead.org" <linux-arm-kernel@lists.infradead.org> Cc: "gregkh@linuxfoundation.org" <gregkh@linuxfoundation.org> Cc: "linux-hyperv@vger.kernel.org" <linux-hyperv@vger.kernel.org> Cc: "olaf@aepfle.de" <olaf@aepfle.de> Cc: "apw@canonical.com" <apw@canonical.com> Cc: "jasowang@redhat.com" <jasowang@redhat.com> Cc: "marcelo.cerri@canonical.com" <marcelo.cerri@canonical.com> Cc: Sunil Muthuswamy <sunilmut@microsoft.com> Cc: KY Srinivasan <kys@microsoft.com> Cc: "sashal@kernel.org" <sashal@kernel.org> Cc: "vincenzo.frascino@arm.com" <vincenzo.frascino@arm.com> Cc: "linux-arch@vger.kernel.org" <linux-arch@vger.kernel.org> Cc: "linux-mips@vger.kernel.org" <linux-mips@vger.kernel.org> Cc: "linux-kselftest@vger.kernel.org" <linux-kselftest@vger.kernel.org> Cc: "arnd@arndb.de" <arnd@arndb.de> Cc: "linux@armlinux.org.uk" <linux@armlinux.org.uk> Cc: "ralf@linux-mips.org" <ralf@linux-mips.org> Cc: "paul.burton@mips.com" <paul.burton@mips.com> Cc: "daniel.lezcano@linaro.org" <daniel.lezcano@linaro.org> Cc: "salyzyn@android.com" <salyzyn@android.com> Cc: "pcc@google.com" <pcc@google.com> Cc: "shuah@kernel.org" <shuah@kernel.org> Cc: "0x7f454c46@gmail.com" <0x7f454c46@gmail.com> Cc: "linux@rasmusvillemoes.dk" <linux@rasmusvillemoes.dk> Cc: "huw@codeweavers.com" <huw@codeweavers.com> Cc: "sfr@canb.auug.org.au" <sfr@canb.auug.org.au> Cc: "pbonzini@redhat.com" <pbonzini@redhat.com> Cc: "rkrcmar@redhat.com" <rkrcmar@redhat.com> Cc: "kvm@vger.kernel.org" <kvm@vger.kernel.org> Link: https://lkml.kernel.org/r/1561955054-1838-2-git-send-email-mikelley@microsoft.com
278 lines
6.8 KiB
C
278 lines
6.8 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;
|
|
}
|
|
|
|
INIT_LIST_HEAD(&hv_cpu->chan_list);
|
|
}
|
|
|
|
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.
|
|
*/
|
|
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;
|
|
|
|
/* 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(VMBUS_MESSAGE_SINT, shared_sint.as_uint64);
|
|
|
|
shared_sint.vector = HYPERVISOR_CALLBACK_VECTOR;
|
|
shared_sint.masked = false;
|
|
if (ms_hyperv.hints & HV_DEPRECATING_AEOI_RECOMMENDED)
|
|
shared_sint.auto_eoi = false;
|
|
else
|
|
shared_sint.auto_eoi = true;
|
|
|
|
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);
|
|
|
|
hv_stimer_init(cpu);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
|
|
hv_get_synic_state(sctrl.as_uint64);
|
|
if (sctrl.enable != 1)
|
|
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;
|
|
|
|
hv_stimer_cleanup(cpu);
|
|
|
|
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 */
|
|
sctrl.enable = 0;
|
|
hv_set_synic_state(sctrl.as_uint64);
|
|
|
|
return 0;
|
|
}
|