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xemu/hw/ppc/spapr_drc.c
Laurent Vivier fe6824d126 spapr: fix memory hot-unplugging 
If, once the kernel has booted, we try to remove a memory
hotplugged while the kernel was not started, QEMU crashes on
an assert:

    qemu-system-ppc64: hw/virtio/vhost.c:651:
                       vhost_commit: Assertion `r >= 0' failed.
    ...
    #4  in vhost_commit
    #5  in memory_region_transaction_commit
    #6  in pc_dimm_memory_unplug
    #7  in spapr_memory_unplug
    #8  spapr_machine_device_unplug
    #9  in hotplug_handler_unplug
    #10 in spapr_lmb_release
    #11 in detach
    #12 in set_allocation_state
    #13 in rtas_set_indicator
    ...

If we take a closer look to the guest kernel log, we can see when
we try to unplug the memory:

    pseries-hotplug-mem: Attempting to hot-add 4 LMB(s)

What happens:

    1- The kernel has ignored the memory hotplug event because
       it was not started when it was generated.

    2- When we hot-unplug the memory,
       QEMU starts to remove the memory,
            generates an hot-unplug event,
        and signals the kernel of the incoming new event

    3- as the kernel is started, on the QEMU signal, it reads
       the event list, decodes the hotplug event and tries to
       finish the hotplugging.

    4- QEMU receive the the hotplug notification while it
       is trying to hot-unplug the memory. This moves the memory
       DRC to an invalid state

This patch prevents this by not allowing to set the allocation
state to USABLE while the DRC is awaiting release.

RHBZ: https://bugzilla.redhat.com/show_bug.cgi?id=1432382

Signed-off-by: Laurent Vivier <lvivier@redhat.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
2017-03-29 11:35:16 +11:00

875 lines
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/*
* QEMU SPAPR Dynamic Reconfiguration Connector Implementation
*
* Copyright IBM Corp. 2014
*
* Authors:
* Michael Roth <mdroth@linux.vnet.ibm.com>
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*/
#include "qemu/osdep.h"
#include "qapi/error.h"
#include "cpu.h"
#include "qemu/cutils.h"
#include "hw/ppc/spapr_drc.h"
#include "qom/object.h"
#include "hw/qdev.h"
#include "qapi/visitor.h"
#include "qemu/error-report.h"
#include "hw/ppc/spapr.h" /* for RTAS return codes */
#include "trace.h"
#define DRC_CONTAINER_PATH "/dr-connector"
#define DRC_INDEX_TYPE_SHIFT 28
#define DRC_INDEX_ID_MASK ((1ULL << DRC_INDEX_TYPE_SHIFT) - 1)
static sPAPRDRConnectorTypeShift get_type_shift(sPAPRDRConnectorType type)
{
uint32_t shift = 0;
/* make sure this isn't SPAPR_DR_CONNECTOR_TYPE_ANY, or some
* other wonky value.
*/
g_assert(is_power_of_2(type));
while (type != (1 << shift)) {
shift++;
}
return shift;
}
static uint32_t get_index(sPAPRDRConnector *drc)
{
/* no set format for a drc index: it only needs to be globally
* unique. this is how we encode the DRC type on bare-metal
* however, so might as well do that here
*/
return (get_type_shift(drc->type) << DRC_INDEX_TYPE_SHIFT) |
(drc->id & DRC_INDEX_ID_MASK);
}
static uint32_t set_isolation_state(sPAPRDRConnector *drc,
sPAPRDRIsolationState state)
{
sPAPRDRConnectorClass *drck = SPAPR_DR_CONNECTOR_GET_CLASS(drc);
trace_spapr_drc_set_isolation_state(get_index(drc), state);
if (state == SPAPR_DR_ISOLATION_STATE_UNISOLATED) {
/* cannot unisolate a non-existent resource, and, or resources
* which are in an 'UNUSABLE' allocation state. (PAPR 2.7, 13.5.3.5)
*/
if (!drc->dev ||
drc->allocation_state == SPAPR_DR_ALLOCATION_STATE_UNUSABLE) {
return RTAS_OUT_NO_SUCH_INDICATOR;
}
}
/*
* Fail any requests to ISOLATE the LMB DRC if this LMB doesn't
* belong to a DIMM device that is marked for removal.
*
* Currently the guest userspace tool drmgr that drives the memory
* hotplug/unplug will just try to remove a set of 'removable' LMBs
* in response to a hot unplug request that is based on drc-count.
* If the LMB being removed doesn't belong to a DIMM device that is
* actually being unplugged, fail the isolation request here.
*/
if (drc->type == SPAPR_DR_CONNECTOR_TYPE_LMB) {
if ((state == SPAPR_DR_ISOLATION_STATE_ISOLATED) &&
!drc->awaiting_release) {
return RTAS_OUT_HW_ERROR;
}
}
drc->isolation_state = state;
if (drc->isolation_state == SPAPR_DR_ISOLATION_STATE_ISOLATED) {
/* if we're awaiting release, but still in an unconfigured state,
* it's likely the guest is still in the process of configuring
* the device and is transitioning the devices to an ISOLATED
* state as a part of that process. so we only complete the
* removal when this transition happens for a device in a
* configured state, as suggested by the state diagram from
* PAPR+ 2.7, 13.4
*/
if (drc->awaiting_release) {
if (drc->configured) {
trace_spapr_drc_set_isolation_state_finalizing(get_index(drc));
drck->detach(drc, DEVICE(drc->dev), drc->detach_cb,
drc->detach_cb_opaque, NULL);
} else {
trace_spapr_drc_set_isolation_state_deferring(get_index(drc));
}
}
drc->configured = false;
}
return RTAS_OUT_SUCCESS;
}
static uint32_t set_indicator_state(sPAPRDRConnector *drc,
sPAPRDRIndicatorState state)
{
trace_spapr_drc_set_indicator_state(get_index(drc), state);
drc->indicator_state = state;
return RTAS_OUT_SUCCESS;
}
static uint32_t set_allocation_state(sPAPRDRConnector *drc,
sPAPRDRAllocationState state)
{
sPAPRDRConnectorClass *drck = SPAPR_DR_CONNECTOR_GET_CLASS(drc);
trace_spapr_drc_set_allocation_state(get_index(drc), state);
if (state == SPAPR_DR_ALLOCATION_STATE_USABLE) {
/* if there's no resource/device associated with the DRC, there's
* no way for us to put it in an allocation state consistent with
* being 'USABLE'. PAPR 2.7, 13.5.3.4 documents that this should
* result in an RTAS return code of -3 / "no such indicator"
*/
if (!drc->dev) {
return RTAS_OUT_NO_SUCH_INDICATOR;
}
if (drc->awaiting_release && drc->awaiting_allocation) {
/* kernel is acknowledging a previous hotplug event
* while we are already removing it.
* it's safe to ignore awaiting_allocation here since we know the
* situation is predicated on the guest either already having done
* so (boot-time hotplug), or never being able to acquire in the
* first place (hotplug followed by immediate unplug).
*/
drc->awaiting_allocation_skippable = true;
return RTAS_OUT_NO_SUCH_INDICATOR;
}
}
if (drc->type != SPAPR_DR_CONNECTOR_TYPE_PCI) {
drc->allocation_state = state;
if (drc->awaiting_release &&
drc->allocation_state == SPAPR_DR_ALLOCATION_STATE_UNUSABLE) {
trace_spapr_drc_set_allocation_state_finalizing(get_index(drc));
drck->detach(drc, DEVICE(drc->dev), drc->detach_cb,
drc->detach_cb_opaque, NULL);
} else if (drc->allocation_state == SPAPR_DR_ALLOCATION_STATE_USABLE) {
drc->awaiting_allocation = false;
}
}
return RTAS_OUT_SUCCESS;
}
static uint32_t get_type(sPAPRDRConnector *drc)
{
return drc->type;
}
static const char *get_name(sPAPRDRConnector *drc)
{
return drc->name;
}
static const void *get_fdt(sPAPRDRConnector *drc, int *fdt_start_offset)
{
if (fdt_start_offset) {
*fdt_start_offset = drc->fdt_start_offset;
}
return drc->fdt;
}
static void set_configured(sPAPRDRConnector *drc)
{
trace_spapr_drc_set_configured(get_index(drc));
if (drc->isolation_state != SPAPR_DR_ISOLATION_STATE_UNISOLATED) {
/* guest should be not configuring an isolated device */
trace_spapr_drc_set_configured_skipping(get_index(drc));
return;
}
drc->configured = true;
}
/* has the guest been notified of device attachment? */
static void set_signalled(sPAPRDRConnector *drc)
{
drc->signalled = true;
}
/*
* dr-entity-sense sensor value
* returned via get-sensor-state RTAS calls
* as expected by state diagram in PAPR+ 2.7, 13.4
* based on the current allocation/indicator/power states
* for the DR connector.
*/
static uint32_t entity_sense(sPAPRDRConnector *drc, sPAPRDREntitySense *state)
{
if (drc->dev) {
if (drc->type != SPAPR_DR_CONNECTOR_TYPE_PCI &&
drc->allocation_state == SPAPR_DR_ALLOCATION_STATE_UNUSABLE) {
/* for logical DR, we return a state of UNUSABLE
* iff the allocation state UNUSABLE.
* Otherwise, report the state as USABLE/PRESENT,
* as we would for PCI.
*/
*state = SPAPR_DR_ENTITY_SENSE_UNUSABLE;
} else {
/* this assumes all PCI devices are assigned to
* a 'live insertion' power domain, where QEMU
* manages power state automatically as opposed
* to the guest. present, non-PCI resources are
* unaffected by power state.
*/
*state = SPAPR_DR_ENTITY_SENSE_PRESENT;
}
} else {
if (drc->type == SPAPR_DR_CONNECTOR_TYPE_PCI) {
/* PCI devices, and only PCI devices, use EMPTY
* in cases where we'd otherwise use UNUSABLE
*/
*state = SPAPR_DR_ENTITY_SENSE_EMPTY;
} else {
*state = SPAPR_DR_ENTITY_SENSE_UNUSABLE;
}
}
trace_spapr_drc_entity_sense(get_index(drc), *state);
return RTAS_OUT_SUCCESS;
}
static void prop_get_index(Object *obj, Visitor *v, const char *name,
void *opaque, Error **errp)
{
sPAPRDRConnector *drc = SPAPR_DR_CONNECTOR(obj);
sPAPRDRConnectorClass *drck = SPAPR_DR_CONNECTOR_GET_CLASS(drc);
uint32_t value = (uint32_t)drck->get_index(drc);
visit_type_uint32(v, name, &value, errp);
}
static void prop_get_type(Object *obj, Visitor *v, const char *name,
void *opaque, Error **errp)
{
sPAPRDRConnector *drc = SPAPR_DR_CONNECTOR(obj);
sPAPRDRConnectorClass *drck = SPAPR_DR_CONNECTOR_GET_CLASS(drc);
uint32_t value = (uint32_t)drck->get_type(drc);
visit_type_uint32(v, name, &value, errp);
}
static char *prop_get_name(Object *obj, Error **errp)
{
sPAPRDRConnector *drc = SPAPR_DR_CONNECTOR(obj);
sPAPRDRConnectorClass *drck = SPAPR_DR_CONNECTOR_GET_CLASS(drc);
return g_strdup(drck->get_name(drc));
}
static void prop_get_entity_sense(Object *obj, Visitor *v, const char *name,
void *opaque, Error **errp)
{
sPAPRDRConnector *drc = SPAPR_DR_CONNECTOR(obj);
sPAPRDRConnectorClass *drck = SPAPR_DR_CONNECTOR_GET_CLASS(drc);
uint32_t value;
drck->entity_sense(drc, &value);
visit_type_uint32(v, name, &value, errp);
}
static void prop_get_fdt(Object *obj, Visitor *v, const char *name,
void *opaque, Error **errp)
{
sPAPRDRConnector *drc = SPAPR_DR_CONNECTOR(obj);
Error *err = NULL;
int fdt_offset_next, fdt_offset, fdt_depth;
void *fdt;
if (!drc->fdt) {
visit_type_null(v, NULL, errp);
return;
}
fdt = drc->fdt;
fdt_offset = drc->fdt_start_offset;
fdt_depth = 0;
do {
const char *name = NULL;
const struct fdt_property *prop = NULL;
int prop_len = 0, name_len = 0;
uint32_t tag;
tag = fdt_next_tag(fdt, fdt_offset, &fdt_offset_next);
switch (tag) {
case FDT_BEGIN_NODE:
fdt_depth++;
name = fdt_get_name(fdt, fdt_offset, &name_len);
visit_start_struct(v, name, NULL, 0, &err);
if (err) {
error_propagate(errp, err);
return;
}
break;
case FDT_END_NODE:
/* shouldn't ever see an FDT_END_NODE before FDT_BEGIN_NODE */
g_assert(fdt_depth > 0);
visit_check_struct(v, &err);
visit_end_struct(v, NULL);
if (err) {
error_propagate(errp, err);
return;
}
fdt_depth--;
break;
case FDT_PROP: {
int i;
prop = fdt_get_property_by_offset(fdt, fdt_offset, &prop_len);
name = fdt_string(fdt, fdt32_to_cpu(prop->nameoff));
visit_start_list(v, name, NULL, 0, &err);
if (err) {
error_propagate(errp, err);
return;
}
for (i = 0; i < prop_len; i++) {
visit_type_uint8(v, NULL, (uint8_t *)&prop->data[i], &err);
if (err) {
error_propagate(errp, err);
return;
}
}
visit_check_list(v, &err);
visit_end_list(v, NULL);
if (err) {
error_propagate(errp, err);
return;
}
break;
}
default:
error_setg(&error_abort, "device FDT in unexpected state: %d", tag);
}
fdt_offset = fdt_offset_next;
} while (fdt_depth != 0);
}
static void attach(sPAPRDRConnector *drc, DeviceState *d, void *fdt,
int fdt_start_offset, bool coldplug, Error **errp)
{
trace_spapr_drc_attach(get_index(drc));
if (drc->isolation_state != SPAPR_DR_ISOLATION_STATE_ISOLATED) {
error_setg(errp, "an attached device is still awaiting release");
return;
}
if (drc->type == SPAPR_DR_CONNECTOR_TYPE_PCI) {
g_assert(drc->allocation_state == SPAPR_DR_ALLOCATION_STATE_USABLE);
}
g_assert(fdt || coldplug);
/* NOTE: setting initial isolation state to UNISOLATED means we can't
* detach unless guest has a userspace/kernel that moves this state
* back to ISOLATED in response to an unplug event, or this is done
* manually by the admin prior. if we force things while the guest
* may be accessing the device, we can easily crash the guest, so we
* we defer completion of removal in such cases to the reset() hook.
*/
if (drc->type == SPAPR_DR_CONNECTOR_TYPE_PCI) {
drc->isolation_state = SPAPR_DR_ISOLATION_STATE_UNISOLATED;
}
drc->indicator_state = SPAPR_DR_INDICATOR_STATE_ACTIVE;
drc->dev = d;
drc->fdt = fdt;
drc->fdt_start_offset = fdt_start_offset;
drc->configured = coldplug;
/* 'logical' DR resources such as memory/cpus are in some cases treated
* as a pool of resources from which the guest is free to choose from
* based on only a count. for resources that can be assigned in this
* fashion, we must assume the resource is signalled immediately
* since a single hotplug request might make an arbitrary number of
* such attached resources available to the guest, as opposed to
* 'physical' DR resources such as PCI where each device/resource is
* signalled individually.
*/
drc->signalled = (drc->type != SPAPR_DR_CONNECTOR_TYPE_PCI)
? true : coldplug;
if (drc->type != SPAPR_DR_CONNECTOR_TYPE_PCI) {
drc->awaiting_allocation = true;
}
object_property_add_link(OBJECT(drc), "device",
object_get_typename(OBJECT(drc->dev)),
(Object **)(&drc->dev),
NULL, 0, NULL);
}
static void detach(sPAPRDRConnector *drc, DeviceState *d,
spapr_drc_detach_cb *detach_cb,
void *detach_cb_opaque, Error **errp)
{
trace_spapr_drc_detach(get_index(drc));
drc->detach_cb = detach_cb;
drc->detach_cb_opaque = detach_cb_opaque;
/* if we've signalled device presence to the guest, or if the guest
* has gone ahead and configured the device (via manually-executed
* device add via drmgr in guest, namely), we need to wait
* for the guest to quiesce the device before completing detach.
* Otherwise, we can assume the guest hasn't seen it and complete the
* detach immediately. Note that there is a small race window
* just before, or during, configuration, which is this context
* refers mainly to fetching the device tree via RTAS.
* During this window the device access will be arbitrated by
* associated DRC, which will simply fail the RTAS calls as invalid.
* This is recoverable within guest and current implementations of
* drmgr should be able to cope.
*/
if (!drc->signalled && !drc->configured) {
/* if the guest hasn't seen the device we can't rely on it to
* set it back to an isolated state via RTAS, so do it here manually
*/
drc->isolation_state = SPAPR_DR_ISOLATION_STATE_ISOLATED;
}
if (drc->isolation_state != SPAPR_DR_ISOLATION_STATE_ISOLATED) {
trace_spapr_drc_awaiting_isolated(get_index(drc));
drc->awaiting_release = true;
return;
}
if (drc->type != SPAPR_DR_CONNECTOR_TYPE_PCI &&
drc->allocation_state != SPAPR_DR_ALLOCATION_STATE_UNUSABLE) {
trace_spapr_drc_awaiting_unusable(get_index(drc));
drc->awaiting_release = true;
return;
}
if (drc->awaiting_allocation) {
if (!drc->awaiting_allocation_skippable) {
drc->awaiting_release = true;
trace_spapr_drc_awaiting_allocation(get_index(drc));
return;
}
}
drc->indicator_state = SPAPR_DR_INDICATOR_STATE_INACTIVE;
if (drc->detach_cb) {
drc->detach_cb(drc->dev, drc->detach_cb_opaque);
}
drc->awaiting_release = false;
drc->awaiting_allocation_skippable = false;
g_free(drc->fdt);
drc->fdt = NULL;
drc->fdt_start_offset = 0;
object_property_del(OBJECT(drc), "device", NULL);
drc->dev = NULL;
drc->detach_cb = NULL;
drc->detach_cb_opaque = NULL;
}
static bool release_pending(sPAPRDRConnector *drc)
{
return drc->awaiting_release;
}
static void reset(DeviceState *d)
{
sPAPRDRConnector *drc = SPAPR_DR_CONNECTOR(d);
sPAPRDRConnectorClass *drck = SPAPR_DR_CONNECTOR_GET_CLASS(drc);
sPAPRDREntitySense state;
trace_spapr_drc_reset(drck->get_index(drc));
/* immediately upon reset we can safely assume DRCs whose devices
* are pending removal can be safely removed, and that they will
* subsequently be left in an ISOLATED state. move the DRC to this
* state in these cases (which will in turn complete any pending
* device removals)
*/
if (drc->awaiting_release) {
drck->set_isolation_state(drc, SPAPR_DR_ISOLATION_STATE_ISOLATED);
/* generally this should also finalize the removal, but if the device
* hasn't yet been configured we normally defer removal under the
* assumption that this transition is taking place as part of device
* configuration. so check if we're still waiting after this, and
* force removal if we are
*/
if (drc->awaiting_release) {
drck->detach(drc, DEVICE(drc->dev), drc->detach_cb,
drc->detach_cb_opaque, NULL);
}
/* non-PCI devices may be awaiting a transition to UNUSABLE */
if (drc->type != SPAPR_DR_CONNECTOR_TYPE_PCI &&
drc->awaiting_release) {
drck->set_allocation_state(drc, SPAPR_DR_ALLOCATION_STATE_UNUSABLE);
}
}
drck->entity_sense(drc, &state);
if (state == SPAPR_DR_ENTITY_SENSE_PRESENT) {
drck->set_signalled(drc);
}
}
static void realize(DeviceState *d, Error **errp)
{
sPAPRDRConnector *drc = SPAPR_DR_CONNECTOR(d);
sPAPRDRConnectorClass *drck = SPAPR_DR_CONNECTOR_GET_CLASS(drc);
Object *root_container;
char link_name[256];
gchar *child_name;
Error *err = NULL;
trace_spapr_drc_realize(drck->get_index(drc));
/* NOTE: we do this as part of realize/unrealize due to the fact
* that the guest will communicate with the DRC via RTAS calls
* referencing the global DRC index. By unlinking the DRC
* from DRC_CONTAINER_PATH/<drc_index> we effectively make it
* inaccessible by the guest, since lookups rely on this path
* existing in the composition tree
*/
root_container = container_get(object_get_root(), DRC_CONTAINER_PATH);
snprintf(link_name, sizeof(link_name), "%x", drck->get_index(drc));
child_name = object_get_canonical_path_component(OBJECT(drc));
trace_spapr_drc_realize_child(drck->get_index(drc), child_name);
object_property_add_alias(root_container, link_name,
drc->owner, child_name, &err);
if (err) {
error_report_err(err);
object_unref(OBJECT(drc));
}
g_free(child_name);
trace_spapr_drc_realize_complete(drck->get_index(drc));
}
static void unrealize(DeviceState *d, Error **errp)
{
sPAPRDRConnector *drc = SPAPR_DR_CONNECTOR(d);
sPAPRDRConnectorClass *drck = SPAPR_DR_CONNECTOR_GET_CLASS(drc);
Object *root_container;
char name[256];
Error *err = NULL;
trace_spapr_drc_unrealize(drck->get_index(drc));
root_container = container_get(object_get_root(), DRC_CONTAINER_PATH);
snprintf(name, sizeof(name), "%x", drck->get_index(drc));
object_property_del(root_container, name, &err);
if (err) {
error_report_err(err);
object_unref(OBJECT(drc));
}
}
sPAPRDRConnector *spapr_dr_connector_new(Object *owner,
sPAPRDRConnectorType type,
uint32_t id)
{
sPAPRDRConnector *drc =
SPAPR_DR_CONNECTOR(object_new(TYPE_SPAPR_DR_CONNECTOR));
char *prop_name;
g_assert(type);
drc->type = type;
drc->id = id;
drc->owner = owner;
prop_name = g_strdup_printf("dr-connector[%"PRIu32"]", get_index(drc));
object_property_add_child(owner, prop_name, OBJECT(drc), NULL);
object_property_set_bool(OBJECT(drc), true, "realized", NULL);
g_free(prop_name);
/* human-readable name for a DRC to encode into the DT
* description. this is mainly only used within a guest in place
* of the unique DRC index.
*
* in the case of VIO/PCI devices, it corresponds to a
* "location code" that maps a logical device/function (DRC index)
* to a physical (or virtual in the case of VIO) location in the
* system by chaining together the "location label" for each
* encapsulating component.
*
* since this is more to do with diagnosing physical hardware
* issues than guest compatibility, we choose location codes/DRC
* names that adhere to the documented format, but avoid encoding
* the entire topology information into the label/code, instead
* just using the location codes based on the labels for the
* endpoints (VIO/PCI adaptor connectors), which is basically
* just "C" followed by an integer ID.
*
* DRC names as documented by PAPR+ v2.7, 13.5.2.4
* location codes as documented by PAPR+ v2.7, 12.3.1.5
*/
switch (drc->type) {
case SPAPR_DR_CONNECTOR_TYPE_CPU:
drc->name = g_strdup_printf("CPU %d", id);
break;
case SPAPR_DR_CONNECTOR_TYPE_PHB:
drc->name = g_strdup_printf("PHB %d", id);
break;
case SPAPR_DR_CONNECTOR_TYPE_VIO:
case SPAPR_DR_CONNECTOR_TYPE_PCI:
drc->name = g_strdup_printf("C%d", id);
break;
case SPAPR_DR_CONNECTOR_TYPE_LMB:
drc->name = g_strdup_printf("LMB %d", id);
break;
default:
g_assert(false);
}
/* PCI slot always start in a USABLE state, and stay there */
if (drc->type == SPAPR_DR_CONNECTOR_TYPE_PCI) {
drc->allocation_state = SPAPR_DR_ALLOCATION_STATE_USABLE;
}
return drc;
}
static void spapr_dr_connector_instance_init(Object *obj)
{
sPAPRDRConnector *drc = SPAPR_DR_CONNECTOR(obj);
object_property_add_uint32_ptr(obj, "isolation-state",
&drc->isolation_state, NULL);
object_property_add_uint32_ptr(obj, "indicator-state",
&drc->indicator_state, NULL);
object_property_add_uint32_ptr(obj, "allocation-state",
&drc->allocation_state, NULL);
object_property_add_uint32_ptr(obj, "id", &drc->id, NULL);
object_property_add(obj, "index", "uint32", prop_get_index,
NULL, NULL, NULL, NULL);
object_property_add(obj, "connector_type", "uint32", prop_get_type,
NULL, NULL, NULL, NULL);
object_property_add_str(obj, "name", prop_get_name, NULL, NULL);
object_property_add(obj, "entity-sense", "uint32", prop_get_entity_sense,
NULL, NULL, NULL, NULL);
object_property_add(obj, "fdt", "struct", prop_get_fdt,
NULL, NULL, NULL, NULL);
}
static void spapr_dr_connector_class_init(ObjectClass *k, void *data)
{
DeviceClass *dk = DEVICE_CLASS(k);
sPAPRDRConnectorClass *drck = SPAPR_DR_CONNECTOR_CLASS(k);
dk->reset = reset;
dk->realize = realize;
dk->unrealize = unrealize;
drck->set_isolation_state = set_isolation_state;
drck->set_indicator_state = set_indicator_state;
drck->set_allocation_state = set_allocation_state;
drck->get_index = get_index;
drck->get_type = get_type;
drck->get_name = get_name;
drck->get_fdt = get_fdt;
drck->set_configured = set_configured;
drck->entity_sense = entity_sense;
drck->attach = attach;
drck->detach = detach;
drck->release_pending = release_pending;
drck->set_signalled = set_signalled;
/*
* Reason: it crashes FIXME find and document the real reason
*/
dk->cannot_instantiate_with_device_add_yet = true;
}
static const TypeInfo spapr_dr_connector_info = {
.name = TYPE_SPAPR_DR_CONNECTOR,
.parent = TYPE_DEVICE,
.instance_size = sizeof(sPAPRDRConnector),
.instance_init = spapr_dr_connector_instance_init,
.class_size = sizeof(sPAPRDRConnectorClass),
.class_init = spapr_dr_connector_class_init,
};
static void spapr_drc_register_types(void)
{
type_register_static(&spapr_dr_connector_info);
}
type_init(spapr_drc_register_types)
/* helper functions for external users */
sPAPRDRConnector *spapr_dr_connector_by_index(uint32_t index)
{
Object *obj;
char name[256];
snprintf(name, sizeof(name), "%s/%x", DRC_CONTAINER_PATH, index);
obj = object_resolve_path(name, NULL);
return !obj ? NULL : SPAPR_DR_CONNECTOR(obj);
}
sPAPRDRConnector *spapr_dr_connector_by_id(sPAPRDRConnectorType type,
uint32_t id)
{
return spapr_dr_connector_by_index(
(get_type_shift(type) << DRC_INDEX_TYPE_SHIFT) |
(id & DRC_INDEX_ID_MASK));
}
/* generate a string the describes the DRC to encode into the
* device tree.
*
* as documented by PAPR+ v2.7, 13.5.2.6 and C.6.1
*/
static const char *spapr_drc_get_type_str(sPAPRDRConnectorType type)
{
switch (type) {
case SPAPR_DR_CONNECTOR_TYPE_CPU:
return "CPU";
case SPAPR_DR_CONNECTOR_TYPE_PHB:
return "PHB";
case SPAPR_DR_CONNECTOR_TYPE_VIO:
return "SLOT";
case SPAPR_DR_CONNECTOR_TYPE_PCI:
return "28";
case SPAPR_DR_CONNECTOR_TYPE_LMB:
return "MEM";
default:
g_assert(false);
}
return NULL;
}
/**
* spapr_drc_populate_dt
*
* @fdt: libfdt device tree
* @path: path in the DT to generate properties
* @owner: parent Object/DeviceState for which to generate DRC
* descriptions for
* @drc_type_mask: mask of sPAPRDRConnectorType values corresponding
* to the types of DRCs to generate entries for
*
* generate OF properties to describe DRC topology/indices to guests
*
* as documented in PAPR+ v2.1, 13.5.2
*/
int spapr_drc_populate_dt(void *fdt, int fdt_offset, Object *owner,
uint32_t drc_type_mask)
{
Object *root_container;
ObjectProperty *prop;
ObjectPropertyIterator iter;
uint32_t drc_count = 0;
GArray *drc_indexes, *drc_power_domains;
GString *drc_names, *drc_types;
int ret;
/* the first entry of each properties is a 32-bit integer encoding
* the number of elements in the array. we won't know this until
* we complete the iteration through all the matching DRCs, but
* reserve the space now and set the offsets accordingly so we
* can fill them in later.
*/
drc_indexes = g_array_new(false, true, sizeof(uint32_t));
drc_indexes = g_array_set_size(drc_indexes, 1);
drc_power_domains = g_array_new(false, true, sizeof(uint32_t));
drc_power_domains = g_array_set_size(drc_power_domains, 1);
drc_names = g_string_set_size(g_string_new(NULL), sizeof(uint32_t));
drc_types = g_string_set_size(g_string_new(NULL), sizeof(uint32_t));
/* aliases for all DRConnector objects will be rooted in QOM
* composition tree at DRC_CONTAINER_PATH
*/
root_container = container_get(object_get_root(), DRC_CONTAINER_PATH);
object_property_iter_init(&iter, root_container);
while ((prop = object_property_iter_next(&iter))) {
Object *obj;
sPAPRDRConnector *drc;
sPAPRDRConnectorClass *drck;
uint32_t drc_index, drc_power_domain;
if (!strstart(prop->type, "link<", NULL)) {
continue;
}
obj = object_property_get_link(root_container, prop->name, NULL);
drc = SPAPR_DR_CONNECTOR(obj);
drck = SPAPR_DR_CONNECTOR_GET_CLASS(drc);
if (owner && (drc->owner != owner)) {
continue;
}
if ((drc->type & drc_type_mask) == 0) {
continue;
}
drc_count++;
/* ibm,drc-indexes */
drc_index = cpu_to_be32(drck->get_index(drc));
g_array_append_val(drc_indexes, drc_index);
/* ibm,drc-power-domains */
drc_power_domain = cpu_to_be32(-1);
g_array_append_val(drc_power_domains, drc_power_domain);
/* ibm,drc-names */
drc_names = g_string_append(drc_names, drck->get_name(drc));
drc_names = g_string_insert_len(drc_names, -1, "\0", 1);
/* ibm,drc-types */
drc_types = g_string_append(drc_types,
spapr_drc_get_type_str(drc->type));
drc_types = g_string_insert_len(drc_types, -1, "\0", 1);
}
/* now write the drc count into the space we reserved at the
* beginning of the arrays previously
*/
*(uint32_t *)drc_indexes->data = cpu_to_be32(drc_count);
*(uint32_t *)drc_power_domains->data = cpu_to_be32(drc_count);
*(uint32_t *)drc_names->str = cpu_to_be32(drc_count);
*(uint32_t *)drc_types->str = cpu_to_be32(drc_count);
ret = fdt_setprop(fdt, fdt_offset, "ibm,drc-indexes",
drc_indexes->data,
drc_indexes->len * sizeof(uint32_t));
if (ret) {
error_report("Couldn't create ibm,drc-indexes property");
goto out;
}
ret = fdt_setprop(fdt, fdt_offset, "ibm,drc-power-domains",
drc_power_domains->data,
drc_power_domains->len * sizeof(uint32_t));
if (ret) {
error_report("Couldn't finalize ibm,drc-power-domains property");
goto out;
}
ret = fdt_setprop(fdt, fdt_offset, "ibm,drc-names",
drc_names->str, drc_names->len);
if (ret) {
error_report("Couldn't finalize ibm,drc-names property");
goto out;
}
ret = fdt_setprop(fdt, fdt_offset, "ibm,drc-types",
drc_types->str, drc_types->len);
if (ret) {
error_report("Couldn't finalize ibm,drc-types property");
goto out;
}
out:
g_array_free(drc_indexes, true);
g_array_free(drc_power_domains, true);
g_string_free(drc_names, true);
g_string_free(drc_types, true);
return ret;
}
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