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qemu/hw/ppc/spapr_nvdimm.c
Shivaprasad G Bhat 8601b4f11d spapr: nvdimm: Introduce spapr-nvdimm device 
If the device backend is not persistent memory for the nvdimm, there is
need for explicit IO flushes on the backend to ensure persistence.

On SPAPR, the issue is addressed by adding a new hcall to request for
an explicit flush from the guest when the backend is not pmem. So, the
approach here is to convey when the hcall flush is required in a device
tree property. The guest once it knows the device backend is not pmem,
makes the hcall whenever flush is required.

To set the device tree property, a new PAPR specific device type inheriting
the nvdimm device is implemented. When the backend doesn't have pmem=on
the device tree property "ibm,hcall-flush-required" is set, and the guest
makes hcall H_SCM_FLUSH requesting for an explicit flush. The new device
has boolean property pmem-override which when "on" advertises the device
tree property even when pmem=on for the backend. The flush function
invokes the fdatasync or pmem_persist() based on the type of backend.

The vmstate structures are made part of the spapr-nvdimm device object.
The patch attempts to keep the migration compatibility between source and
destination while rejecting the incompatibles ones with failures.

Signed-off-by: Shivaprasad G Bhat <sbhat@linux.ibm.com>
Reviewed-by: Daniel Henrique Barboza <danielhb413@gmail.com>
Message-Id: <164396256092.109112.17933240273840803354.stgit@ltczzess4.aus.stglabs.ibm.com>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
2022-02-18 08:34:14 +01:00

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/*
* QEMU PAPR Storage Class Memory Interfaces
*
* Copyright (c) 2019-2020, IBM Corporation.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
* THE SOFTWARE.
*/
#include "qemu/osdep.h"
#include "qemu/cutils.h"
#include "qapi/error.h"
#include "hw/ppc/spapr_drc.h"
#include "hw/ppc/spapr_nvdimm.h"
#include "hw/mem/nvdimm.h"
#include "qemu/nvdimm-utils.h"
#include "hw/ppc/fdt.h"
#include "qemu/range.h"
#include "hw/ppc/spapr_numa.h"
#include "block/thread-pool.h"
#include "migration/vmstate.h"
#include "qemu/pmem.h"
#include "hw/qdev-properties.h"
/* DIMM health bitmap bitmap indicators. Taken from kernel's papr_scm.c */
/* SCM device is unable to persist memory contents */
#define PAPR_PMEM_UNARMED PPC_BIT(0)
/*
* The nvdimm size should be aligned to SCM block size.
* The SCM block size should be aligned to SPAPR_MEMORY_BLOCK_SIZE
* in order to have SCM regions not to overlap with dimm memory regions.
* The SCM devices can have variable block sizes. For now, fixing the
* block size to the minimum value.
*/
#define SPAPR_MINIMUM_SCM_BLOCK_SIZE SPAPR_MEMORY_BLOCK_SIZE
/* Have an explicit check for alignment */
QEMU_BUILD_BUG_ON(SPAPR_MINIMUM_SCM_BLOCK_SIZE % SPAPR_MEMORY_BLOCK_SIZE);
#define TYPE_SPAPR_NVDIMM "spapr-nvdimm"
OBJECT_DECLARE_TYPE(SpaprNVDIMMDevice, SPAPRNVDIMMClass, SPAPR_NVDIMM)
struct SPAPRNVDIMMClass {
/* private */
NVDIMMClass parent_class;
/* public */
void (*realize)(NVDIMMDevice *dimm, Error **errp);
void (*unrealize)(NVDIMMDevice *dimm, Error **errp);
};
bool spapr_nvdimm_validate(HotplugHandler *hotplug_dev, NVDIMMDevice *nvdimm,
uint64_t size, Error **errp)
{
const MachineClass *mc = MACHINE_GET_CLASS(hotplug_dev);
const MachineState *ms = MACHINE(hotplug_dev);
PCDIMMDevice *dimm = PC_DIMM(nvdimm);
MemoryRegion *mr = host_memory_backend_get_memory(dimm->hostmem);
g_autofree char *uuidstr = NULL;
QemuUUID uuid;
int ret;
if (!mc->nvdimm_supported) {
error_setg(errp, "NVDIMM hotplug not supported for this machine");
return false;
}
if (!ms->nvdimms_state->is_enabled) {
error_setg(errp, "nvdimm device found but 'nvdimm=off' was set");
return false;
}
if (object_property_get_int(OBJECT(nvdimm), NVDIMM_LABEL_SIZE_PROP,
&error_abort) == 0) {
error_setg(errp, "PAPR requires NVDIMM devices to have label-size set");
return false;
}
if (size % SPAPR_MINIMUM_SCM_BLOCK_SIZE) {
error_setg(errp, "PAPR requires NVDIMM memory size (excluding label)"
" to be a multiple of %" PRIu64 "MB",
SPAPR_MINIMUM_SCM_BLOCK_SIZE / MiB);
return false;
}
uuidstr = object_property_get_str(OBJECT(nvdimm), NVDIMM_UUID_PROP,
&error_abort);
ret = qemu_uuid_parse(uuidstr, &uuid);
g_assert(!ret);
if (qemu_uuid_is_null(&uuid)) {
error_setg(errp, "NVDIMM device requires the uuid to be set");
return false;
}
if (object_dynamic_cast(OBJECT(nvdimm), TYPE_SPAPR_NVDIMM) &&
(memory_region_get_fd(mr) < 0)) {
error_setg(errp, "spapr-nvdimm device requires the "
"memdev %s to be of memory-backend-file type",
object_get_canonical_path_component(OBJECT(dimm->hostmem)));
return false;
}
return true;
}
void spapr_add_nvdimm(DeviceState *dev, uint64_t slot)
{
SpaprDrc *drc;
bool hotplugged = spapr_drc_hotplugged(dev);
drc = spapr_drc_by_id(TYPE_SPAPR_DRC_PMEM, slot);
g_assert(drc);
/*
* pc_dimm_get_free_slot() provided a free slot at pre-plug. The
* corresponding DRC is thus assumed to be attachable.
*/
spapr_drc_attach(drc, dev);
if (hotplugged) {
spapr_hotplug_req_add_by_index(drc);
}
}
static int spapr_dt_nvdimm(SpaprMachineState *spapr, void *fdt,
int parent_offset, NVDIMMDevice *nvdimm)
{
int child_offset;
char *buf;
SpaprDrc *drc;
uint32_t drc_idx;
uint32_t node = object_property_get_uint(OBJECT(nvdimm), PC_DIMM_NODE_PROP,
&error_abort);
uint64_t slot = object_property_get_uint(OBJECT(nvdimm), PC_DIMM_SLOT_PROP,
&error_abort);
uint64_t lsize = nvdimm->label_size;
uint64_t size = object_property_get_int(OBJECT(nvdimm), PC_DIMM_SIZE_PROP,
NULL);
drc = spapr_drc_by_id(TYPE_SPAPR_DRC_PMEM, slot);
g_assert(drc);
drc_idx = spapr_drc_index(drc);
buf = g_strdup_printf("ibm,pmemory@%x", drc_idx);
child_offset = fdt_add_subnode(fdt, parent_offset, buf);
g_free(buf);
_FDT(child_offset);
_FDT((fdt_setprop_cell(fdt, child_offset, "reg", drc_idx)));
_FDT((fdt_setprop_string(fdt, child_offset, "compatible", "ibm,pmemory")));
_FDT((fdt_setprop_string(fdt, child_offset, "device_type", "ibm,pmemory")));
spapr_numa_write_associativity_dt(spapr, fdt, child_offset, node);
buf = qemu_uuid_unparse_strdup(&nvdimm->uuid);
_FDT((fdt_setprop_string(fdt, child_offset, "ibm,unit-guid", buf)));
g_free(buf);
_FDT((fdt_setprop_cell(fdt, child_offset, "ibm,my-drc-index", drc_idx)));
_FDT((fdt_setprop_u64(fdt, child_offset, "ibm,block-size",
SPAPR_MINIMUM_SCM_BLOCK_SIZE)));
_FDT((fdt_setprop_u64(fdt, child_offset, "ibm,number-of-blocks",
size / SPAPR_MINIMUM_SCM_BLOCK_SIZE)));
_FDT((fdt_setprop_cell(fdt, child_offset, "ibm,metadata-size", lsize)));
_FDT((fdt_setprop_string(fdt, child_offset, "ibm,pmem-application",
"operating-system")));
_FDT(fdt_setprop(fdt, child_offset, "ibm,cache-flush-required", NULL, 0));
if (object_dynamic_cast(OBJECT(nvdimm), TYPE_SPAPR_NVDIMM)) {
bool is_pmem = false, pmem_override = false;
PCDIMMDevice *dimm = PC_DIMM(nvdimm);
HostMemoryBackend *hostmem = dimm->hostmem;
is_pmem = object_property_get_bool(OBJECT(hostmem), "pmem", NULL);
pmem_override = object_property_get_bool(OBJECT(nvdimm),
"pmem-override", NULL);
if (!is_pmem || pmem_override) {
_FDT(fdt_setprop(fdt, child_offset, "ibm,hcall-flush-required",
NULL, 0));
}
}
return child_offset;
}
int spapr_pmem_dt_populate(SpaprDrc *drc, SpaprMachineState *spapr,
void *fdt, int *fdt_start_offset, Error **errp)
{
NVDIMMDevice *nvdimm = NVDIMM(drc->dev);
*fdt_start_offset = spapr_dt_nvdimm(spapr, fdt, 0, nvdimm);
return 0;
}
void spapr_dt_persistent_memory(SpaprMachineState *spapr, void *fdt)
{
int offset = fdt_subnode_offset(fdt, 0, "ibm,persistent-memory");
GSList *iter, *nvdimms = nvdimm_get_device_list();
if (offset < 0) {
offset = fdt_add_subnode(fdt, 0, "ibm,persistent-memory");
_FDT(offset);
_FDT((fdt_setprop_cell(fdt, offset, "#address-cells", 0x1)));
_FDT((fdt_setprop_cell(fdt, offset, "#size-cells", 0x0)));
_FDT((fdt_setprop_string(fdt, offset, "device_type",
"ibm,persistent-memory")));
}
/* Create DT entries for cold plugged NVDIMM devices */
for (iter = nvdimms; iter; iter = iter->next) {
NVDIMMDevice *nvdimm = iter->data;
spapr_dt_nvdimm(spapr, fdt, offset, nvdimm);
}
g_slist_free(nvdimms);
return;
}
static target_ulong h_scm_read_metadata(PowerPCCPU *cpu,
SpaprMachineState *spapr,
target_ulong opcode,
target_ulong *args)
{
uint32_t drc_index = args[0];
uint64_t offset = args[1];
uint64_t len = args[2];
SpaprDrc *drc = spapr_drc_by_index(drc_index);
NVDIMMDevice *nvdimm;
NVDIMMClass *ddc;
uint64_t data = 0;
uint8_t buf[8] = { 0 };
if (!drc || !drc->dev ||
spapr_drc_type(drc) != SPAPR_DR_CONNECTOR_TYPE_PMEM) {
return H_PARAMETER;
}
if (len != 1 && len != 2 &&
len != 4 && len != 8) {
return H_P3;
}
nvdimm = NVDIMM(drc->dev);
if ((offset + len < offset) ||
(nvdimm->label_size < len + offset)) {
return H_P2;
}
ddc = NVDIMM_GET_CLASS(nvdimm);
ddc->read_label_data(nvdimm, buf, len, offset);
switch (len) {
case 1:
data = ldub_p(buf);
break;
case 2:
data = lduw_be_p(buf);
break;
case 4:
data = ldl_be_p(buf);
break;
case 8:
data = ldq_be_p(buf);
break;
default:
g_assert_not_reached();
}
args[0] = data;
return H_SUCCESS;
}
static target_ulong h_scm_write_metadata(PowerPCCPU *cpu,
SpaprMachineState *spapr,
target_ulong opcode,
target_ulong *args)
{
uint32_t drc_index = args[0];
uint64_t offset = args[1];
uint64_t data = args[2];
uint64_t len = args[3];
SpaprDrc *drc = spapr_drc_by_index(drc_index);
NVDIMMDevice *nvdimm;
NVDIMMClass *ddc;
uint8_t buf[8] = { 0 };
if (!drc || !drc->dev ||
spapr_drc_type(drc) != SPAPR_DR_CONNECTOR_TYPE_PMEM) {
return H_PARAMETER;
}
if (len != 1 && len != 2 &&
len != 4 && len != 8) {
return H_P4;
}
nvdimm = NVDIMM(drc->dev);
if ((offset + len < offset) ||
(nvdimm->label_size < len + offset)) {
return H_P2;
}
switch (len) {
case 1:
if (data & 0xffffffffffffff00) {
return H_P2;
}
stb_p(buf, data);
break;
case 2:
if (data & 0xffffffffffff0000) {
return H_P2;
}
stw_be_p(buf, data);
break;
case 4:
if (data & 0xffffffff00000000) {
return H_P2;
}
stl_be_p(buf, data);
break;
case 8:
stq_be_p(buf, data);
break;
default:
g_assert_not_reached();
}
ddc = NVDIMM_GET_CLASS(nvdimm);
ddc->write_label_data(nvdimm, buf, len, offset);
return H_SUCCESS;
}
static target_ulong h_scm_bind_mem(PowerPCCPU *cpu, SpaprMachineState *spapr,
target_ulong opcode, target_ulong *args)
{
uint32_t drc_index = args[0];
uint64_t starting_idx = args[1];
uint64_t no_of_scm_blocks_to_bind = args[2];
uint64_t target_logical_mem_addr = args[3];
uint64_t continue_token = args[4];
uint64_t size;
uint64_t total_no_of_scm_blocks;
SpaprDrc *drc = spapr_drc_by_index(drc_index);
hwaddr addr;
NVDIMMDevice *nvdimm;
if (!drc || !drc->dev ||
spapr_drc_type(drc) != SPAPR_DR_CONNECTOR_TYPE_PMEM) {
return H_PARAMETER;
}
/*
* Currently continue token should be zero qemu has already bound
* everything and this hcall doesnt return H_BUSY.
*/
if (continue_token > 0) {
return H_P5;
}
/* Currently qemu assigns the address. */
if (target_logical_mem_addr != 0xffffffffffffffff) {
return H_OVERLAP;
}
nvdimm = NVDIMM(drc->dev);
size = object_property_get_uint(OBJECT(nvdimm),
PC_DIMM_SIZE_PROP, &error_abort);
total_no_of_scm_blocks = size / SPAPR_MINIMUM_SCM_BLOCK_SIZE;
if (starting_idx > total_no_of_scm_blocks) {
return H_P2;
}
if (((starting_idx + no_of_scm_blocks_to_bind) < starting_idx) ||
((starting_idx + no_of_scm_blocks_to_bind) > total_no_of_scm_blocks)) {
return H_P3;
}
addr = object_property_get_uint(OBJECT(nvdimm),
PC_DIMM_ADDR_PROP, &error_abort);
addr += starting_idx * SPAPR_MINIMUM_SCM_BLOCK_SIZE;
/* Already bound, Return target logical address in R5 */
args[1] = addr;
args[2] = no_of_scm_blocks_to_bind;
return H_SUCCESS;
}
typedef struct SpaprNVDIMMDeviceFlushState {
uint64_t continue_token;
int64_t hcall_ret;
uint32_t drcidx;
QLIST_ENTRY(SpaprNVDIMMDeviceFlushState) node;
} SpaprNVDIMMDeviceFlushState;
typedef struct SpaprNVDIMMDevice SpaprNVDIMMDevice;
struct SpaprNVDIMMDevice {
/* private */
NVDIMMDevice parent_obj;
bool hcall_flush_required;
uint64_t nvdimm_flush_token;
QLIST_HEAD(, SpaprNVDIMMDeviceFlushState) pending_nvdimm_flush_states;
QLIST_HEAD(, SpaprNVDIMMDeviceFlushState) completed_nvdimm_flush_states;
/* public */
/*
* The 'on' value for this property forced the qemu to enable the hcall
* flush for the nvdimm device even if the backend is a pmem
*/
bool pmem_override;
};
static int flush_worker_cb(void *opaque)
{
SpaprNVDIMMDeviceFlushState *state = opaque;
SpaprDrc *drc = spapr_drc_by_index(state->drcidx);
PCDIMMDevice *dimm = PC_DIMM(drc->dev);
HostMemoryBackend *backend = MEMORY_BACKEND(dimm->hostmem);
int backend_fd = memory_region_get_fd(&backend->mr);
if (object_property_get_bool(OBJECT(backend), "pmem", NULL)) {
MemoryRegion *mr = host_memory_backend_get_memory(dimm->hostmem);
void *ptr = memory_region_get_ram_ptr(mr);
size_t size = object_property_get_uint(OBJECT(dimm), PC_DIMM_SIZE_PROP,
NULL);
/* flush pmem backend */
pmem_persist(ptr, size);
} else {
/* flush raw backing image */
if (qemu_fdatasync(backend_fd) < 0) {
error_report("papr_scm: Could not sync nvdimm to backend file: %s",
strerror(errno));
return H_HARDWARE;
}
}
return H_SUCCESS;
}
static void spapr_nvdimm_flush_completion_cb(void *opaque, int hcall_ret)
{
SpaprNVDIMMDeviceFlushState *state = opaque;
SpaprDrc *drc = spapr_drc_by_index(state->drcidx);
SpaprNVDIMMDevice *s_nvdimm = SPAPR_NVDIMM(drc->dev);
state->hcall_ret = hcall_ret;
QLIST_REMOVE(state, node);
QLIST_INSERT_HEAD(&s_nvdimm->completed_nvdimm_flush_states, state, node);
}
static int spapr_nvdimm_flush_post_load(void *opaque, int version_id)
{
SpaprNVDIMMDevice *s_nvdimm = (SpaprNVDIMMDevice *)opaque;
SpaprNVDIMMDeviceFlushState *state;
ThreadPool *pool = aio_get_thread_pool(qemu_get_aio_context());
HostMemoryBackend *backend = MEMORY_BACKEND(PC_DIMM(s_nvdimm)->hostmem);
bool is_pmem = object_property_get_bool(OBJECT(backend), "pmem", NULL);
bool pmem_override = object_property_get_bool(OBJECT(s_nvdimm),
"pmem-override", NULL);
bool dest_hcall_flush_required = pmem_override || !is_pmem;
if (!s_nvdimm->hcall_flush_required && dest_hcall_flush_required) {
error_report("The file backend for the spapr-nvdimm device %s at "
"source is a pmem, use pmem=on and pmem-override=off to "
"continue.", DEVICE(s_nvdimm)->id);
return -EINVAL;
}
if (s_nvdimm->hcall_flush_required && !dest_hcall_flush_required) {
error_report("The guest expects hcall-flush support for the "
"spapr-nvdimm device %s, use pmem_override=on to "
"continue.", DEVICE(s_nvdimm)->id);
return -EINVAL;
}
QLIST_FOREACH(state, &s_nvdimm->pending_nvdimm_flush_states, node) {
thread_pool_submit_aio(pool, flush_worker_cb, state,
spapr_nvdimm_flush_completion_cb, state);
}
return 0;
}
static const VMStateDescription vmstate_spapr_nvdimm_flush_state = {
.name = "spapr_nvdimm_flush_state",
.version_id = 1,
.minimum_version_id = 1,
.fields = (VMStateField[]) {
VMSTATE_UINT64(continue_token, SpaprNVDIMMDeviceFlushState),
VMSTATE_INT64(hcall_ret, SpaprNVDIMMDeviceFlushState),
VMSTATE_UINT32(drcidx, SpaprNVDIMMDeviceFlushState),
VMSTATE_END_OF_LIST()
},
};
const VMStateDescription vmstate_spapr_nvdimm_states = {
.name = "spapr_nvdimm_states",
.version_id = 1,
.minimum_version_id = 1,
.post_load = spapr_nvdimm_flush_post_load,
.fields = (VMStateField[]) {
VMSTATE_BOOL(hcall_flush_required, SpaprNVDIMMDevice),
VMSTATE_UINT64(nvdimm_flush_token, SpaprNVDIMMDevice),
VMSTATE_QLIST_V(completed_nvdimm_flush_states, SpaprNVDIMMDevice, 1,
vmstate_spapr_nvdimm_flush_state,
SpaprNVDIMMDeviceFlushState, node),
VMSTATE_QLIST_V(pending_nvdimm_flush_states, SpaprNVDIMMDevice, 1,
vmstate_spapr_nvdimm_flush_state,
SpaprNVDIMMDeviceFlushState, node),
VMSTATE_END_OF_LIST()
},
};
/*
* Assign a token and reserve it for the new flush state.
*/
static SpaprNVDIMMDeviceFlushState *spapr_nvdimm_init_new_flush_state(
SpaprNVDIMMDevice *spapr_nvdimm)
{
SpaprNVDIMMDeviceFlushState *state;
state = g_malloc0(sizeof(*state));
spapr_nvdimm->nvdimm_flush_token++;
/* Token zero is presumed as no job pending. Assert on overflow to zero */
g_assert(spapr_nvdimm->nvdimm_flush_token != 0);
state->continue_token = spapr_nvdimm->nvdimm_flush_token;
QLIST_INSERT_HEAD(&spapr_nvdimm->pending_nvdimm_flush_states, state, node);
return state;
}
/*
* spapr_nvdimm_finish_flushes
* Waits for all pending flush requests to complete
* their execution and free the states
*/
void spapr_nvdimm_finish_flushes(void)
{
SpaprNVDIMMDeviceFlushState *state, *next;
GSList *list, *nvdimms;
/*
* Called on reset path, the main loop thread which calls
* the pending BHs has gotten out running in the reset path,
* finally reaching here. Other code path being guest
* h_client_architecture_support, thats early boot up.
*/
nvdimms = nvdimm_get_device_list();
for (list = nvdimms; list; list = list->next) {
NVDIMMDevice *nvdimm = list->data;
if (object_dynamic_cast(OBJECT(nvdimm), TYPE_SPAPR_NVDIMM)) {
SpaprNVDIMMDevice *s_nvdimm = SPAPR_NVDIMM(nvdimm);
while (!QLIST_EMPTY(&s_nvdimm->pending_nvdimm_flush_states)) {
aio_poll(qemu_get_aio_context(), true);
}
QLIST_FOREACH_SAFE(state, &s_nvdimm->completed_nvdimm_flush_states,
node, next) {
QLIST_REMOVE(state, node);
g_free(state);
}
}
}
g_slist_free(nvdimms);
}
/*
* spapr_nvdimm_get_flush_status
* Fetches the status of the hcall worker and returns
* H_LONG_BUSY_ORDER_10_MSEC if the worker is still running.
*/
static int spapr_nvdimm_get_flush_status(SpaprNVDIMMDevice *s_nvdimm,
uint64_t token)
{
SpaprNVDIMMDeviceFlushState *state, *node;
QLIST_FOREACH(state, &s_nvdimm->pending_nvdimm_flush_states, node) {
if (state->continue_token == token) {
return H_LONG_BUSY_ORDER_10_MSEC;
}
}
QLIST_FOREACH_SAFE(state, &s_nvdimm->completed_nvdimm_flush_states,
node, node) {
if (state->continue_token == token) {
int ret = state->hcall_ret;
QLIST_REMOVE(state, node);
g_free(state);
return ret;
}
}
/* If not found in complete list too, invalid token */
return H_P2;
}
/*
* H_SCM_FLUSH
* Input: drc_index, continue-token
* Out: continue-token
* Return Value: H_SUCCESS, H_Parameter, H_P2, H_LONG_BUSY_ORDER_10_MSEC,
* H_UNSUPPORTED
*
* Given a DRC Index Flush the data to backend NVDIMM device. The hcall returns
* H_LONG_BUSY_ORDER_10_MSEC when the flush takes longer time and the hcall
* needs to be issued multiple times in order to be completely serviced. The
* continue-token from the output to be passed in the argument list of
* subsequent hcalls until the hcall is completely serviced at which point
* H_SUCCESS or other error is returned.
*/
static target_ulong h_scm_flush(PowerPCCPU *cpu, SpaprMachineState *spapr,
target_ulong opcode, target_ulong *args)
{
int ret;
uint32_t drc_index = args[0];
uint64_t continue_token = args[1];
SpaprDrc *drc = spapr_drc_by_index(drc_index);
PCDIMMDevice *dimm;
HostMemoryBackend *backend = NULL;
SpaprNVDIMMDeviceFlushState *state;
ThreadPool *pool = aio_get_thread_pool(qemu_get_aio_context());
int fd;
if (!drc || !drc->dev ||
spapr_drc_type(drc) != SPAPR_DR_CONNECTOR_TYPE_PMEM) {
return H_PARAMETER;
}
dimm = PC_DIMM(drc->dev);
if (!object_dynamic_cast(OBJECT(dimm), TYPE_SPAPR_NVDIMM)) {
return H_PARAMETER;
}
if (continue_token == 0) {
bool is_pmem = false, pmem_override = false;
backend = MEMORY_BACKEND(dimm->hostmem);
fd = memory_region_get_fd(&backend->mr);
if (fd < 0) {
return H_UNSUPPORTED;
}
is_pmem = object_property_get_bool(OBJECT(backend), "pmem", NULL);
pmem_override = object_property_get_bool(OBJECT(dimm),
"pmem-override", NULL);
if (is_pmem && !pmem_override) {
return H_UNSUPPORTED;
}
state = spapr_nvdimm_init_new_flush_state(SPAPR_NVDIMM(dimm));
if (!state) {
return H_HARDWARE;
}
state->drcidx = drc_index;
thread_pool_submit_aio(pool, flush_worker_cb, state,
spapr_nvdimm_flush_completion_cb, state);
continue_token = state->continue_token;
}
ret = spapr_nvdimm_get_flush_status(SPAPR_NVDIMM(dimm), continue_token);
if (H_IS_LONG_BUSY(ret)) {
args[0] = continue_token;
}
return ret;
}
static target_ulong h_scm_unbind_mem(PowerPCCPU *cpu, SpaprMachineState *spapr,
target_ulong opcode, target_ulong *args)
{
uint32_t drc_index = args[0];
uint64_t starting_scm_logical_addr = args[1];
uint64_t no_of_scm_blocks_to_unbind = args[2];
uint64_t continue_token = args[3];
uint64_t size_to_unbind;
Range blockrange = range_empty;
Range nvdimmrange = range_empty;
SpaprDrc *drc = spapr_drc_by_index(drc_index);
NVDIMMDevice *nvdimm;
uint64_t size, addr;
if (!drc || !drc->dev ||
spapr_drc_type(drc) != SPAPR_DR_CONNECTOR_TYPE_PMEM) {
return H_PARAMETER;
}
/* continue_token should be zero as this hcall doesn't return H_BUSY. */
if (continue_token > 0) {
return H_P4;
}
/* Check if starting_scm_logical_addr is block aligned */
if (!QEMU_IS_ALIGNED(starting_scm_logical_addr,
SPAPR_MINIMUM_SCM_BLOCK_SIZE)) {
return H_P2;
}
size_to_unbind = no_of_scm_blocks_to_unbind * SPAPR_MINIMUM_SCM_BLOCK_SIZE;
if (no_of_scm_blocks_to_unbind == 0 || no_of_scm_blocks_to_unbind !=
size_to_unbind / SPAPR_MINIMUM_SCM_BLOCK_SIZE) {
return H_P3;
}
nvdimm = NVDIMM(drc->dev);
size = object_property_get_int(OBJECT(nvdimm), PC_DIMM_SIZE_PROP,
&error_abort);
addr = object_property_get_int(OBJECT(nvdimm), PC_DIMM_ADDR_PROP,
&error_abort);
range_init_nofail(&nvdimmrange, addr, size);
range_init_nofail(&blockrange, starting_scm_logical_addr, size_to_unbind);
if (!range_contains_range(&nvdimmrange, &blockrange)) {
return H_P3;
}
args[1] = no_of_scm_blocks_to_unbind;
/* let unplug take care of actual unbind */
return H_SUCCESS;
}
#define H_UNBIND_SCOPE_ALL 0x1
#define H_UNBIND_SCOPE_DRC 0x2
static target_ulong h_scm_unbind_all(PowerPCCPU *cpu, SpaprMachineState *spapr,
target_ulong opcode, target_ulong *args)
{
uint64_t target_scope = args[0];
uint32_t drc_index = args[1];
uint64_t continue_token = args[2];
NVDIMMDevice *nvdimm;
uint64_t size;
uint64_t no_of_scm_blocks_unbound = 0;
/* continue_token should be zero as this hcall doesn't return H_BUSY. */
if (continue_token > 0) {
return H_P4;
}
if (target_scope == H_UNBIND_SCOPE_DRC) {
SpaprDrc *drc = spapr_drc_by_index(drc_index);
if (!drc || !drc->dev ||
spapr_drc_type(drc) != SPAPR_DR_CONNECTOR_TYPE_PMEM) {
return H_P2;
}
nvdimm = NVDIMM(drc->dev);
size = object_property_get_int(OBJECT(nvdimm), PC_DIMM_SIZE_PROP,
&error_abort);
no_of_scm_blocks_unbound = size / SPAPR_MINIMUM_SCM_BLOCK_SIZE;
} else if (target_scope == H_UNBIND_SCOPE_ALL) {
GSList *list, *nvdimms;
nvdimms = nvdimm_get_device_list();
for (list = nvdimms; list; list = list->next) {
nvdimm = list->data;
size = object_property_get_int(OBJECT(nvdimm), PC_DIMM_SIZE_PROP,
&error_abort);
no_of_scm_blocks_unbound += size / SPAPR_MINIMUM_SCM_BLOCK_SIZE;
}
g_slist_free(nvdimms);
} else {
return H_PARAMETER;
}
args[1] = no_of_scm_blocks_unbound;
/* let unplug take care of actual unbind */
return H_SUCCESS;
}
static target_ulong h_scm_health(PowerPCCPU *cpu, SpaprMachineState *spapr,
target_ulong opcode, target_ulong *args)
{
NVDIMMDevice *nvdimm;
uint64_t hbitmap = 0;
uint32_t drc_index = args[0];
SpaprDrc *drc = spapr_drc_by_index(drc_index);
const uint64_t hbitmap_mask = PAPR_PMEM_UNARMED;
/* Ensure that the drc is valid & is valid PMEM dimm and is plugged in */
if (!drc || !drc->dev ||
spapr_drc_type(drc) != SPAPR_DR_CONNECTOR_TYPE_PMEM) {
return H_PARAMETER;
}
nvdimm = NVDIMM(drc->dev);
/* Update if the nvdimm is unarmed and send its status via health bitmaps */
if (object_property_get_bool(OBJECT(nvdimm), NVDIMM_UNARMED_PROP, NULL)) {
hbitmap |= PAPR_PMEM_UNARMED;
}
/* Update the out args with health bitmap/mask */
args[0] = hbitmap;
args[1] = hbitmap_mask;
return H_SUCCESS;
}
static void spapr_scm_register_types(void)
{
/* qemu/scm specific hcalls */
spapr_register_hypercall(H_SCM_READ_METADATA, h_scm_read_metadata);
spapr_register_hypercall(H_SCM_WRITE_METADATA, h_scm_write_metadata);
spapr_register_hypercall(H_SCM_BIND_MEM, h_scm_bind_mem);
spapr_register_hypercall(H_SCM_UNBIND_MEM, h_scm_unbind_mem);
spapr_register_hypercall(H_SCM_UNBIND_ALL, h_scm_unbind_all);
spapr_register_hypercall(H_SCM_HEALTH, h_scm_health);
spapr_register_hypercall(H_SCM_FLUSH, h_scm_flush);
}
type_init(spapr_scm_register_types)
static void spapr_nvdimm_realize(NVDIMMDevice *dimm, Error **errp)
{
SpaprNVDIMMDevice *s_nvdimm = SPAPR_NVDIMM(dimm);
HostMemoryBackend *backend = MEMORY_BACKEND(PC_DIMM(dimm)->hostmem);
bool is_pmem = object_property_get_bool(OBJECT(backend), "pmem", NULL);
bool pmem_override = object_property_get_bool(OBJECT(dimm), "pmem-override",
NULL);
if (!is_pmem || pmem_override) {
s_nvdimm->hcall_flush_required = true;
}
vmstate_register(NULL, VMSTATE_INSTANCE_ID_ANY,
&vmstate_spapr_nvdimm_states, dimm);
}
static void spapr_nvdimm_unrealize(NVDIMMDevice *dimm)
{
vmstate_unregister(NULL, &vmstate_spapr_nvdimm_states, dimm);
}
static Property spapr_nvdimm_properties[] = {
#ifdef CONFIG_LIBPMEM
DEFINE_PROP_BOOL("pmem-override", SpaprNVDIMMDevice, pmem_override, false),
#endif
DEFINE_PROP_END_OF_LIST(),
};
static void spapr_nvdimm_class_init(ObjectClass *oc, void *data)
{
DeviceClass *dc = DEVICE_CLASS(oc);
NVDIMMClass *nvc = NVDIMM_CLASS(oc);
nvc->realize = spapr_nvdimm_realize;
nvc->unrealize = spapr_nvdimm_unrealize;
device_class_set_props(dc, spapr_nvdimm_properties);
}
static void spapr_nvdimm_init(Object *obj)
{
SpaprNVDIMMDevice *s_nvdimm = SPAPR_NVDIMM(obj);
s_nvdimm->hcall_flush_required = false;
QLIST_INIT(&s_nvdimm->pending_nvdimm_flush_states);
QLIST_INIT(&s_nvdimm->completed_nvdimm_flush_states);
}
static TypeInfo spapr_nvdimm_info = {
.name = TYPE_SPAPR_NVDIMM,
.parent = TYPE_NVDIMM,
.class_init = spapr_nvdimm_class_init,
.class_size = sizeof(SPAPRNVDIMMClass),
.instance_size = sizeof(SpaprNVDIMMDevice),
.instance_init = spapr_nvdimm_init,
};
static void spapr_nvdimm_register_types(void)
{
type_register_static(&spapr_nvdimm_info);
}
type_init(spapr_nvdimm_register_types)
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