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hw/ppc/spapr.c: adding pending_dimm_unplugs to sPAPRMachineState 

The LMB DRC release callback, spapr_lmb_release(), uses an opaque
parameter, a sPAPRDIMMState struct that stores the current LMBs that
are allocated to a DIMM (nr_lmbs). After each call to this callback,
the nr_lmbs is decremented by one and, when it reaches zero, the callback
proceeds with the qdev calls to hot unplug the LMB.

Using drc->detach_cb_opaque is problematic because it can't be migrated in
the future DRC migration work. This patch makes the following changes to
eliminate the usage of this opaque callback inside spapr_lmb_release:

- sPAPRDIMMState was moved from spapr.c and added to spapr.h. A new
attribute called 'addr' was added to it. This is used as an unique
identifier to associate a sPAPRDIMMState to a PCDIMM element.

- sPAPRMachineState now hosts a new QTAILQ called 'pending_dimm_unplugs'.
This queue of sPAPRDIMMState elements will store the DIMM state of DIMMs
that are currently going under an unplug process.

- spapr_lmb_release() will now retrieve the nr_lmbs value by getting the
correspondent sPAPRDIMMState. A helper function called spapr_dimm_get_address
was created to fetch the address of a PCDIMM device inside spapr_lmb_release.
When nr_lmbs reaches zero and the callback proceeds with the qdev hot unplug
calls, the sPAPRDIMMState struct is removed from spapr->pending_dimm_unplugs.

After these changes, the opaque argument for spapr_lmb_release is now
unused and is passed as NULL inside spapr_del_lmbs. This and the other
opaque arguments can now be safely removed from the code.

As an additional cleanup made by this patch, the spapr_del_lmbs function
was merged with spapr_memory_unplug_request. The former was being called
only by the latter and both were small enough to fit one single function.

Signed-off-by: Daniel Henrique Barboza <danielhb@linux.vnet.ibm.com>
[dwg: Minor stylistic cleanups]
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
David Gibson 2017-05-24 17:01:48 +10:00
parent c871bc70bb
commit 0cffce56ae
2 changed files with 73 additions and 38 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

105
hw/ppc/spapr.c
View File

@ -2059,6 +2059,7 @@ static void ppc_spapr_init(MachineState *machine)
msi_nonbroken = true;
QLIST_INIT(&spapr->phbs);
QTAILQ_INIT(&spapr->pending_dimm_unplugs);
/* Allocate RMA if necessary */
rma_alloc_size = kvmppc_alloc_rma(&rma);
@ -2621,58 +2622,58 @@ static void spapr_memory_pre_plug(HotplugHandler *hotplug_dev, DeviceState *dev,
}
}
typedef struct sPAPRDIMMState {
struct sPAPRDIMMState {
PCDIMMDevice *dimm;
uint32_t nr_lmbs;
} sPAPRDIMMState;
QTAILQ_ENTRY(sPAPRDIMMState) next;
};
static sPAPRDIMMState *spapr_pending_dimm_unplugs_find(sPAPRMachineState *s,
PCDIMMDevice *dimm)
{
sPAPRDIMMState *dimm_state = NULL;
QTAILQ_FOREACH(dimm_state, &s->pending_dimm_unplugs, next) {
if (dimm_state->dimm == dimm) {
break;
}
}
return dimm_state;
}
static void spapr_pending_dimm_unplugs_add(sPAPRMachineState *spapr,
sPAPRDIMMState *dimm_state)
{
g_assert(!spapr_pending_dimm_unplugs_find(spapr, dimm_state->dimm));
QTAILQ_INSERT_HEAD(&spapr->pending_dimm_unplugs, dimm_state, next);
}
static void spapr_pending_dimm_unplugs_remove(sPAPRMachineState *spapr,
sPAPRDIMMState *dimm_state)
{
QTAILQ_REMOVE(&spapr->pending_dimm_unplugs, dimm_state, next);
g_free(dimm_state);
}
static void spapr_lmb_release(DeviceState *dev, void *opaque)
{
sPAPRDIMMState *ds = (sPAPRDIMMState *)opaque;
HotplugHandler *hotplug_ctrl;
HotplugHandler *hotplug_ctrl = qdev_get_hotplug_handler(dev);
sPAPRMachineState *spapr = SPAPR_MACHINE(hotplug_ctrl);
sPAPRDIMMState *ds = spapr_pending_dimm_unplugs_find(spapr, PC_DIMM(dev));
if (--ds->nr_lmbs) {
return;
}
g_free(ds);
spapr_pending_dimm_unplugs_remove(spapr, ds);
/*
* Now that all the LMBs have been removed by the guest, call the
* pc-dimm unplug handler to cleanup up the pc-dimm device.
*/
hotplug_ctrl = qdev_get_hotplug_handler(dev);
hotplug_handler_unplug(hotplug_ctrl, dev, &error_abort);
}
static void spapr_del_lmbs(DeviceState *dev, uint64_t addr_start, uint64_t size,
Error **errp)
{
sPAPRDRConnector *drc;
sPAPRDRConnectorClass *drck;
uint32_t nr_lmbs = size / SPAPR_MEMORY_BLOCK_SIZE;
int i;
sPAPRDIMMState *ds = g_malloc0(sizeof(sPAPRDIMMState));
uint64_t addr = addr_start;
ds->nr_lmbs = nr_lmbs;
for (i = 0; i < nr_lmbs; i++) {
drc = spapr_dr_connector_by_id(SPAPR_DR_CONNECTOR_TYPE_LMB,
addr / SPAPR_MEMORY_BLOCK_SIZE);
g_assert(drc);
drck = SPAPR_DR_CONNECTOR_GET_CLASS(drc);
drck->detach(drc, dev, spapr_lmb_release, ds, errp);
addr += SPAPR_MEMORY_BLOCK_SIZE;
}
drc = spapr_dr_connector_by_id(SPAPR_DR_CONNECTOR_TYPE_LMB,
addr_start / SPAPR_MEMORY_BLOCK_SIZE);
drck = SPAPR_DR_CONNECTOR_GET_CLASS(drc);
spapr_hotplug_req_remove_by_count_indexed(SPAPR_DR_CONNECTOR_TYPE_LMB,
nr_lmbs,
drck->get_index(drc));
}
static void spapr_memory_unplug(HotplugHandler *hotplug_dev, DeviceState *dev,
Error **errp)
{
@ -2688,19 +2689,47 @@ static void spapr_memory_unplug(HotplugHandler *hotplug_dev, DeviceState *dev,
static void spapr_memory_unplug_request(HotplugHandler *hotplug_dev,
DeviceState *dev, Error **errp)
{
sPAPRMachineState *spapr = SPAPR_MACHINE(hotplug_dev);
Error *local_err = NULL;
PCDIMMDevice *dimm = PC_DIMM(dev);
PCDIMMDeviceClass *ddc = PC_DIMM_GET_CLASS(dimm);
MemoryRegion *mr = ddc->get_memory_region(dimm);
uint64_t size = memory_region_size(mr);
uint64_t addr;
uint32_t nr_lmbs = size / SPAPR_MEMORY_BLOCK_SIZE;
uint64_t addr_start, addr;
int i;
sPAPRDRConnector *drc;
sPAPRDRConnectorClass *drck;
sPAPRDIMMState *ds;
addr = object_property_get_int(OBJECT(dimm), PC_DIMM_ADDR_PROP, &local_err);
addr_start = object_property_get_int(OBJECT(dimm), PC_DIMM_ADDR_PROP,
&local_err);
if (local_err) {
goto out;
}
spapr_del_lmbs(dev, addr, size, &error_abort);
ds = g_malloc0(sizeof(sPAPRDIMMState));
ds->nr_lmbs = nr_lmbs;
ds->dimm = dimm;
spapr_pending_dimm_unplugs_add(spapr, ds);
addr = addr_start;
for (i = 0; i < nr_lmbs; i++) {
drc = spapr_dr_connector_by_id(SPAPR_DR_CONNECTOR_TYPE_LMB,
addr / SPAPR_MEMORY_BLOCK_SIZE);
g_assert(drc);
drck = SPAPR_DR_CONNECTOR_GET_CLASS(drc);
drck->detach(drc, dev, spapr_lmb_release, NULL, errp);
addr += SPAPR_MEMORY_BLOCK_SIZE;
}
drc = spapr_dr_connector_by_id(SPAPR_DR_CONNECTOR_TYPE_LMB,
addr_start / SPAPR_MEMORY_BLOCK_SIZE);
drck = SPAPR_DR_CONNECTOR_GET_CLASS(drc);
spapr_hotplug_req_remove_by_count_indexed(SPAPR_DR_CONNECTOR_TYPE_LMB,
nr_lmbs,
drck->get_index(drc));
out:
error_propagate(errp, local_err);
}

6
include/hw/ppc/spapr.h
View File

@ -32,6 +32,7 @@ struct sPAPRRTCState {
int64_t ns_offset;
};
typedef struct sPAPRDIMMState sPAPRDIMMState;
typedef struct sPAPRMachineClass sPAPRMachineClass;
#define TYPE_SPAPR_MACHINE "spapr-machine"
@ -104,6 +105,11 @@ struct sPAPRMachineState {
/* RTAS state */
QTAILQ_HEAD(, sPAPRConfigureConnectorState) ccs_list;
/* Pending DIMM unplug cache. It is populated when a LMB
* unplug starts. It can be regenerated if a migration
* occurs during the unplug process. */
QTAILQ_HEAD(, sPAPRDIMMState) pending_dimm_unplugs;
/*< public >*/
char *kvm_type;
MemoryHotplugState hotplug_memory;