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memory-device: factor out get_memory_region() from pc-dimm 

The memory region is necessary for plugging/unplugging a memory device.
The region size (via get_region_size()) is no longer sufficient, as
besides the alignment, also the region itself is required in order to
add it to the device memory region of the machine via
- memory_region_add_subregion
- memory_region_del_subregion

So, to factor out plugging/unplugging of memory devices from pc-dimm
code, we have to factor out access to the memory region first.

Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: David Hildenbrand <david@redhat.com>
Message-Id: <20181005092024.14344-11-david@redhat.com>
Signed-off-by: Eduardo Habkost <ehabkost@redhat.com>
This commit is contained in:
David Hildenbrand 2018-10-05 11:20:18 +02:00 committed by Eduardo Habkost
parent 946d6154ab
commit 3a0a2b0a2b
4 changed files with 39 additions and 16 deletions
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9
hw/mem/nvdimm.c
View File

@ -27,6 +27,7 @@
#include "qapi/error.h"
#include "qapi/visitor.h"
#include "hw/mem/nvdimm.h"
#include "hw/mem/memory-device.h"
static void nvdimm_get_label_size(Object *obj, Visitor *v, const char *name,
void *opaque, Error **errp)
@ -118,9 +119,10 @@ static void nvdimm_prepare_memory_region(NVDIMMDevice *nvdimm, Error **errp)
nvdimm->nvdimm_mr->align = align;
}
static MemoryRegion *nvdimm_get_memory_region(PCDIMMDevice *dimm, Error **errp)
static MemoryRegion *nvdimm_md_get_memory_region(MemoryDeviceState *md,
Error **errp)
{
NVDIMMDevice *nvdimm = NVDIMM(dimm);
NVDIMMDevice *nvdimm = NVDIMM(md);
Error *local_err = NULL;
if (!nvdimm->nvdimm_mr) {
@ -190,11 +192,12 @@ static Property nvdimm_properties[] = {
static void nvdimm_class_init(ObjectClass *oc, void *data)
{
PCDIMMDeviceClass *ddc = PC_DIMM_CLASS(oc);
MemoryDeviceClass *mdc = MEMORY_DEVICE_CLASS(oc);
NVDIMMClass *nvc = NVDIMM_CLASS(oc);
DeviceClass *dc = DEVICE_CLASS(oc);
ddc->realize = nvdimm_realize;
ddc->get_memory_region = nvdimm_get_memory_region;
mdc->get_memory_region = nvdimm_md_get_memory_region;
dc->props = nvdimm_properties;
nvc->read_label_data = nvdimm_read_label_data;

27
hw/mem/pc-dimm.c
View File

@ -32,7 +32,7 @@ static int pc_dimm_get_free_slot(const int *hint, int max_slots, Error **errp);
void pc_dimm_pre_plug(PCDIMMDevice *dimm, MachineState *machine,
const uint64_t *legacy_align, Error **errp)
{
PCDIMMDeviceClass *ddc = PC_DIMM_GET_CLASS(dimm);
MemoryDeviceClass *mdc = MEMORY_DEVICE_GET_CLASS(dimm);
Error *local_err = NULL;
MemoryRegion *mr;
uint64_t addr, align;
@ -49,7 +49,7 @@ void pc_dimm_pre_plug(PCDIMMDevice *dimm, MachineState *machine,
&error_abort);
trace_mhp_pc_dimm_assigned_slot(slot);
mr = ddc->get_memory_region(dimm, &local_err);
mr = mdc->get_memory_region(MEMORY_DEVICE(dimm), &local_err);
if (local_err) {
goto out;
}
@ -72,9 +72,11 @@ out:
void pc_dimm_plug(PCDIMMDevice *dimm, MachineState *machine, Error **errp)
{
PCDIMMDeviceClass *ddc = PC_DIMM_GET_CLASS(dimm);
MemoryDeviceClass *mdc = MEMORY_DEVICE_GET_CLASS(dimm);
MemoryRegion *vmstate_mr = ddc->get_vmstate_memory_region(dimm,
&error_abort);
MemoryRegion *mr = ddc->get_memory_region(dimm, &error_abort);
MemoryRegion *mr = mdc->get_memory_region(MEMORY_DEVICE(dimm),
&error_abort);
uint64_t addr;
addr = object_property_get_uint(OBJECT(dimm), PC_DIMM_ADDR_PROP,
@ -87,9 +89,11 @@ void pc_dimm_plug(PCDIMMDevice *dimm, MachineState *machine, Error **errp)
void pc_dimm_unplug(PCDIMMDevice *dimm, MachineState *machine)
{
PCDIMMDeviceClass *ddc = PC_DIMM_GET_CLASS(dimm);
MemoryDeviceClass *mdc = MEMORY_DEVICE_GET_CLASS(dimm);
MemoryRegion *vmstate_mr = ddc->get_vmstate_memory_region(dimm,
&error_abort);
MemoryRegion *mr = ddc->get_memory_region(dimm, &error_abort);
MemoryRegion *mr = mdc->get_memory_region(MEMORY_DEVICE(dimm),
&error_abort);
memory_device_unplug_region(machine, mr);
vmstate_unregister_ram(vmstate_mr, DEVICE(dimm));
@ -235,12 +239,11 @@ static uint64_t pc_dimm_md_get_addr(const MemoryDeviceState *md)
static uint64_t pc_dimm_md_get_region_size(const MemoryDeviceState *md,
Error **errp)
{
/* dropping const here is fine as we don't touch the memory region */
PCDIMMDevice *dimm = PC_DIMM(md);
const PCDIMMDeviceClass *ddc = PC_DIMM_GET_CLASS(md);
MemoryDeviceClass *mdc = MEMORY_DEVICE_GET_CLASS(md);
MemoryRegion *mr;
mr = ddc->get_memory_region(dimm, errp);
/* dropping const here is fine as we don't touch the memory region */
mr = mdc->get_memory_region((MemoryDeviceState *)md, errp);
if (!mr) {
return 0;
}
@ -248,6 +251,12 @@ static uint64_t pc_dimm_md_get_region_size(const MemoryDeviceState *md,
return memory_region_size(mr);
}
static MemoryRegion *pc_dimm_md_get_memory_region(MemoryDeviceState *md,
Error **errp)
{
return pc_dimm_get_memory_region(PC_DIMM(md), errp);
}
static void pc_dimm_md_fill_device_info(const MemoryDeviceState *md,
MemoryDeviceInfo *info)
{
@ -289,13 +298,13 @@ static void pc_dimm_class_init(ObjectClass *oc, void *data)
dc->props = pc_dimm_properties;
dc->desc = "DIMM memory module";
ddc->get_memory_region = pc_dimm_get_memory_region;
ddc->get_vmstate_memory_region = pc_dimm_get_memory_region;
mdc->get_addr = pc_dimm_md_get_addr;
/* for a dimm plugged_size == region_size */
mdc->get_plugged_size = pc_dimm_md_get_region_size;
mdc->get_region_size = pc_dimm_md_get_region_size;
mdc->get_memory_region = pc_dimm_md_get_memory_region;
mdc->fill_device_info = pc_dimm_md_fill_device_info;
}

15
include/hw/mem/memory-device.h
View File

@ -38,6 +38,11 @@ typedef struct MemoryDeviceState {
* mapped into guest physical address space at a certain address. The
* address in guest physical memory can either be specified explicitly
* or get assigned automatically.
*
* Conceptually, memory devices only span one memory region. If multiple
* successive memory regions are used, a covering memory region has to
* be provided. Scattered memory regions are not supported for single
* devices.
*/
typedef struct MemoryDeviceClass {
/* private */
@ -68,6 +73,16 @@ typedef struct MemoryDeviceClass {
uint64_t (*get_plugged_size)(const MemoryDeviceState *md, Error **errp);
uint64_t (*get_region_size)(const MemoryDeviceState *md, Error **errp);
/*
* Return the memory region of the memory device.
*
* Called when (un)plugging the memory device, to (un)map the
* memory region in guest physical memory, but also to detect the
* required alignment during address assignment or when the size of the
* memory region is required.
*/
MemoryRegion *(*get_memory_region)(MemoryDeviceState *md, Error **errp);
/*
* Translate the memory device into #MemoryDeviceInfo.
*/

4
include/hw/mem/pc-dimm.h
View File

@ -61,9 +61,6 @@ typedef struct PCDIMMDevice {
* PCDIMMDeviceClass:
* @realize: called after common dimm is realized so that the dimm based
* devices get the chance to do specified operations.
* @get_memory_region: returns #MemoryRegion associated with @dimm which
* is directly mapped into the physical address space of guest. Will not
* fail after the device was realized.
* @get_vmstate_memory_region: returns #MemoryRegion which indicates the
* memory of @dimm should be kept during live migration. Will not fail
* after the device was realized.
@ -74,7 +71,6 @@ typedef struct PCDIMMDeviceClass {
/* public */
void (*realize)(PCDIMMDevice *dimm, Error **errp);
MemoryRegion *(*get_memory_region)(PCDIMMDevice *dimm, Error **errp);
MemoryRegion *(*get_vmstate_memory_region)(PCDIMMDevice *dimm,
Error **errp);
} PCDIMMDeviceClass;