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spapr: Add NVDIMM device support

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Add support for NVDIMM devices for sPAPR. Piggyback on existing nvdimm
device interface in QEMU to support virtual NVDIMM devices for Power.
Create the required DT entries for the device (some entries have
dummy values right now).

The patch creates the required DT node and sends a hotplug
interrupt to the guest. Guest is expected to undertake the normal
DR resource add path in response and start issuing PAPR SCM hcalls.

The device support is verified based on the machine version unlike x86.

This is how it can be used ..
Ex :
For coldplug, the device to be added in qemu command line as shown below
-object memory-backend-file,id=memnvdimm0,prealloc=yes,mem-path=/tmp/nvdimm0,share=yes,size=1073872896
-device nvdimm,label-size=128k,uuid=75a3cdd7-6a2f-4791-8d15-fe0a920e8e9e,memdev=memnvdimm0,id=nvdimm0,slot=0

For hotplug, the device to be added from monitor as below
object_add memory-backend-file,id=memnvdimm0,prealloc=yes,mem-path=/tmp/nvdimm0,share=yes,size=1073872896
device_add nvdimm,label-size=128k,uuid=75a3cdd7-6a2f-4791-8d15-fe0a920e8e9e,memdev=memnvdimm0,id=nvdimm0,slot=0

Signed-off-by: Shivaprasad G Bhat <sbhat@linux.ibm.com>
Signed-off-by: Bharata B Rao <bharata@linux.ibm.com>
               [Early implementation]
Message-Id: <158131058078.2897.12767731856697459923.stgit@lep8c.aus.stglabs.ibm.com>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Shivaprasad G Bhat 2020-02-09 22:56:31 -06:00 • committed by David Gibson
parent 6c5627bb24
commit ee3a71e366
9 changed files with 309 additions and 11 deletions
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4
hw/ppc/spapr_events.c
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@ -196,6 +196,7 @@ struct rtas_event_log_v6_hp {
#define RTAS_LOG_V6_HP_TYPE_SLOT 3
#define RTAS_LOG_V6_HP_TYPE_PHB 4
#define RTAS_LOG_V6_HP_TYPE_PCI 5
#define RTAS_LOG_V6_HP_TYPE_PMEM 6
uint8_t hotplug_action;
#define RTAS_LOG_V6_HP_ACTION_ADD 1
#define RTAS_LOG_V6_HP_ACTION_REMOVE 2
@ -631,6 +632,9 @@ static void spapr_hotplug_req_event(uint8_t hp_id, uint8_t hp_action,
case SPAPR_DR_CONNECTOR_TYPE_PHB:
hp->hotplug_type = RTAS_LOG_V6_HP_TYPE_PHB;
break;
case SPAPR_DR_CONNECTOR_TYPE_PMEM:
hp->hotplug_type = RTAS_LOG_V6_HP_TYPE_PMEM;
break;
default:
/* we shouldn't be signaling hotplug events for resources
* that don't support them