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hw/nvme: flexible data placement emulation

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Add emulation of TP4146 ("Flexible Data Placement").

Reviewed-by: Keith Busch <kbusch@kernel.org>
Signed-off-by: Jesper Devantier <j.devantier@samsung.com>
Signed-off-by: Klaus Jensen <k.jensen@samsung.com>
This commit is contained in:
Jesper Devantier 2023-02-20 12:59:26 +01:00 • committed by Klaus Jensen
parent e181d3da39
commit 73064edfb8
6 changed files with 1179 additions and 15 deletions
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94
hw/nvme/subsys.c
View file

@ -7,10 +7,13 @@
*/
#include "qemu/osdep.h"
#include "qemu/units.h"
#include "qapi/error.h"
#include "nvme.h"
#define NVME_DEFAULT_RU_SIZE (96 * MiB)
static int nvme_subsys_reserve_cntlids(NvmeCtrl *n, int start, int num)
{
NvmeSubsystem *subsys = n->subsys;
@ -109,13 +112,95 @@ void nvme_subsys_unregister_ctrl(NvmeSubsystem *subsys, NvmeCtrl *n)
n->cntlid = -1;
}
static void nvme_subsys_setup(NvmeSubsystem *subsys)
static bool nvme_calc_rgif(uint16_t nruh, uint16_t nrg, uint8_t *rgif)
{
uint16_t val;
unsigned int i;
if (unlikely(nrg == 1)) {
/* PIDRG_NORGI scenario, all of pid is used for PHID */
*rgif = 0;
return true;
}
val = nrg;
i = 0;
while (val) {
val >>= 1;
i++;
}
*rgif = i;
/* ensure remaining bits suffice to represent number of phids in a RG */
if (unlikely((UINT16_MAX >> i) < nruh)) {
*rgif = 0;
return false;
}
return true;
}
static bool nvme_subsys_setup_fdp(NvmeSubsystem *subsys, Error **errp)
{
NvmeEnduranceGroup *endgrp = &subsys->endgrp;
if (!subsys->params.fdp.runs) {
error_setg(errp, "fdp.runs must be non-zero");
return false;
}
endgrp->fdp.runs = subsys->params.fdp.runs;
if (!subsys->params.fdp.nrg) {
error_setg(errp, "fdp.nrg must be non-zero");
return false;
}
endgrp->fdp.nrg = subsys->params.fdp.nrg;
if (!subsys->params.fdp.nruh) {
error_setg(errp, "fdp.nruh must be non-zero");
return false;
}
endgrp->fdp.nruh = subsys->params.fdp.nruh;
if (!nvme_calc_rgif(endgrp->fdp.nruh, endgrp->fdp.nrg, &endgrp->fdp.rgif)) {
error_setg(errp,
"cannot derive a valid rgif (nruh %"PRIu16" nrg %"PRIu32")",
endgrp->fdp.nruh, endgrp->fdp.nrg);
return false;
}
endgrp->fdp.ruhs = g_new(NvmeRuHandle, endgrp->fdp.nruh);
for (uint16_t ruhid = 0; ruhid < endgrp->fdp.nruh; ruhid++) {
endgrp->fdp.ruhs[ruhid] = (NvmeRuHandle) {
.ruht = NVME_RUHT_INITIALLY_ISOLATED,
.ruha = NVME_RUHA_UNUSED,
};
endgrp->fdp.ruhs[ruhid].rus = g_new(NvmeReclaimUnit, endgrp->fdp.nrg);
}
endgrp->fdp.enabled = true;
return true;
}
static bool nvme_subsys_setup(NvmeSubsystem *subsys, Error **errp)
{
const char *nqn = subsys->params.nqn ?
subsys->params.nqn : subsys->parent_obj.id;
snprintf((char *)subsys->subnqn, sizeof(subsys->subnqn),
"nqn.2019-08.org.qemu:%s", nqn);
if (subsys->params.fdp.enabled && !nvme_subsys_setup_fdp(subsys, errp)) {
return false;
}
return true;
}
static void nvme_subsys_realize(DeviceState *dev, Error **errp)
@ -124,11 +209,16 @@ static void nvme_subsys_realize(DeviceState *dev, Error **errp)
qbus_init(&subsys->bus, sizeof(NvmeBus), TYPE_NVME_BUS, dev, dev->id);
nvme_subsys_setup(subsys);
nvme_subsys_setup(subsys, errp);
}
static Property nvme_subsystem_props[] = {
DEFINE_PROP_STRING("nqn", NvmeSubsystem, params.nqn),
DEFINE_PROP_BOOL("fdp", NvmeSubsystem, params.fdp.enabled, false),
DEFINE_PROP_SIZE("fdp.runs", NvmeSubsystem, params.fdp.runs,
NVME_DEFAULT_RU_SIZE),
DEFINE_PROP_UINT32("fdp.nrg", NvmeSubsystem, params.fdp.nrg, 1),
DEFINE_PROP_UINT16("fdp.nruh", NvmeSubsystem, params.fdp.nruh, 0),
DEFINE_PROP_END_OF_LIST(),
};