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acpi: cpuhp: introduce 'firmware performs eject' status/control bits 

Adds bit #4 to status/control field of CPU hotplug MMIO interface.
New bit will be used OSPM to mark CPUs as pending for removal by firmware,
when it calls _EJ0 method on CPU device node. Later on, when firmware
sees this bit set, it will perform CPU eject which will clear bit #4
as well.

Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Message-Id: <20201207140739.3829993-3-imammedo@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
This commit is contained in:
Igor Mammedov 2020-12-07 09:07:33 -05:00 committed by Michael S. Tsirkin
parent 0657c657eb
commit 1e6107d901
4 changed files with 28 additions and 6 deletions
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19
docs/specs/acpi_cpu_hotplug.txt
View File

@ -56,8 +56,11 @@ read access:
no device check event to OSPM was issued.
It's valid only when bit 0 is set.
2: Device remove event, used to distinguish device for which
no device eject request to OSPM was issued.
3-7: reserved and should be ignored by OSPM
no device eject request to OSPM was issued. Firmware must
ignore this bit.
3: reserved and should be ignored by OSPM
4: if set to 1, OSPM requests firmware to perform device eject.
5-7: reserved and should be ignored by OSPM
[0x5-0x7] reserved
[0x8] Command data: (DWORD access)
contains 0 unless value last stored in 'Command field' is one of:
@ -79,10 +82,16 @@ write access:
selected CPU device
2: if set to 1 clears device remove event, set by OSPM
after it has emitted device eject request for the
selected CPU device
selected CPU device.
3: if set to 1 initiates device eject, set by OSPM when it
triggers CPU device removal and calls _EJ0 method
4-7: reserved, OSPM must clear them before writing to register
triggers CPU device removal and calls _EJ0 method or by firmware
when bit #4 is set. In case bit #4 were set, it's cleared as
part of device eject.
4: if set to 1, OSPM hands over device eject to firmware.
Firmware shall issue device eject request as described above
(bit #3) and OSPM should not touch device eject bit (#3) in case
it's asked firmware to perform CPU device eject.
5-7: reserved, OSPM must clear them before writing to register
[0x5] Command field: (1 byte access)
value:
0: selects a CPU device with inserting/removing events and

12
hw/acpi/cpu.c
View File

@ -71,6 +71,7 @@ static uint64_t cpu_hotplug_rd(void *opaque, hwaddr addr, unsigned size)
val |= cdev->cpu ? 1 : 0;
val |= cdev->is_inserting ? 2 : 0;
val |= cdev->is_removing ? 4 : 0;
val |= cdev->fw_remove ? 16 : 0;
trace_cpuhp_acpi_read_flags(cpu_st->selector, val);
break;
case ACPI_CPU_CMD_DATA_OFFSET_RW:
@ -148,6 +149,14 @@ static void cpu_hotplug_wr(void *opaque, hwaddr addr, uint64_t data,
hotplug_ctrl = qdev_get_hotplug_handler(dev);
hotplug_handler_unplug(hotplug_ctrl, dev, NULL);
object_unparent(OBJECT(dev));
cdev->fw_remove = false;
} else if (data & 16) {
if (!cdev->cpu || cdev->cpu == first_cpu) {
trace_cpuhp_acpi_fw_remove_invalid_cpu(cpu_st->selector);
break;
}
trace_cpuhp_acpi_fw_remove_cpu(cpu_st->selector);
cdev->fw_remove = true;
}
break;
case ACPI_CPU_CMD_OFFSET_WR:
@ -159,7 +168,8 @@ static void cpu_hotplug_wr(void *opaque, hwaddr addr, uint64_t data,
do {
cdev = &cpu_st->devs[iter];
if (cdev->is_inserting || cdev->is_removing) {
if (cdev->is_inserting || cdev->is_removing ||
cdev->fw_remove) {
cpu_st->selector = iter;
trace_cpuhp_acpi_cpu_has_events(cpu_st->selector,
cdev->is_inserting, cdev->is_removing);

2
hw/acpi/trace-events
View File

@ -29,6 +29,8 @@ cpuhp_acpi_clear_inserting_evt(uint32_t idx) "idx[0x%"PRIx32"]"
cpuhp_acpi_clear_remove_evt(uint32_t idx) "idx[0x%"PRIx32"]"
cpuhp_acpi_ejecting_invalid_cpu(uint32_t idx) "0x%"PRIx32
cpuhp_acpi_ejecting_cpu(uint32_t idx) "0x%"PRIx32
cpuhp_acpi_fw_remove_invalid_cpu(uint32_t idx) "0x%"PRIx32
cpuhp_acpi_fw_remove_cpu(uint32_t idx) "0x%"PRIx32
cpuhp_acpi_write_ost_ev(uint32_t slot, uint32_t ev) "idx[0x%"PRIx32"] OST EVENT: 0x%"PRIx32
cpuhp_acpi_write_ost_status(uint32_t slot, uint32_t st) "idx[0x%"PRIx32"] OST STATUS: 0x%"PRIx32

1
include/hw/acpi/cpu.h
View File

@ -22,6 +22,7 @@ typedef struct AcpiCpuStatus {
uint64_t arch_id;
bool is_inserting;
bool is_removing;
bool fw_remove;
uint32_t ost_event;
uint32_t ost_status;
} AcpiCpuStatus;