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nvme: introduce PMR support from NVMe 1.4 spec

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This patch introduces support for PMR that has been defined as part of NVMe 1.4
spec. User can now specify a pmrdev option that should point to HostMemoryBackend.
pmrdev memory region will subsequently be exposed as PCI BAR 2 in emulated NVMe
device. Guest OS can perform mmio read and writes to the PMR region that will stay
persistent across system reboot.

Signed-off-by: Andrzej Jakowski <andrzej.jakowski@linux.intel.com>
Reviewed-by: Klaus Jensen <k.jensen@samsung.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Message-Id: <20200330164656.9348-1-andrzej.jakowski@linux.intel.com>
Reviewed-by: Keith Busch <kbusch@kernel.org>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Andrzej Jakowski 2020-03-30 09:46:56 -07:00 • committed by Kevin Wolf
parent eb8a0cf3ba
commit 6cf9413229
5 changed files with 288 additions and 1 deletions
Download patch file Download diff file Expand all files Collapse all files

2
hw/block/Makefile.objs
View file

@ -7,12 +7,12 @@ common-obj-$(CONFIG_PFLASH_CFI02) += pflash_cfi02.o
common-obj-$(CONFIG_XEN) += xen-block.o
common-obj-$(CONFIG_ECC) += ecc.o
common-obj-$(CONFIG_ONENAND) += onenand.o
common-obj-$(CONFIG_NVME_PCI) += nvme.o
common-obj-$(CONFIG_SWIM) += swim.o
common-obj-$(CONFIG_SH4) += tc58128.o
obj-$(CONFIG_VIRTIO_BLK) += virtio-blk.o
obj-$(CONFIG_VHOST_USER_BLK) += vhost-user-blk.o
obj-$(CONFIG_NVME_PCI) += nvme.o
obj-y += dataplane/

109
hw/block/nvme.c
View file

@ -19,10 +19,19 @@
* -drive file=<file>,if=none,id=<drive_id>
* -device nvme,drive=<drive_id>,serial=<serial>,id=<id[optional]>, \
* cmb_size_mb=<cmb_size_mb[optional]>, \
* [pmrdev=<mem_backend_file_id>,] \
* num_queues=<N[optional]>
*
* Note cmb_size_mb denotes size of CMB in MB. CMB is assumed to be at
* offset 0 in BAR2 and supports only WDS, RDS and SQS for now.
*
* cmb_size_mb= and pmrdev= options are mutually exclusive due to limitation
* in available BAR's. cmb_size_mb= will take precedence over pmrdev= when
* both provided.
* Enabling pmr emulation can be achieved by pointing to memory-backend-file.
* For example:
* -object memory-backend-file,id=<mem_id>,share=on,mem-path=<file_path>, \
* size=<size> .... -device nvme,...,pmrdev=<mem_id>
*/
#include "qemu/osdep.h"
@ -35,7 +44,9 @@
#include "sysemu/sysemu.h"
#include "qapi/error.h"
#include "qapi/visitor.h"
#include "sysemu/hostmem.h"
#include "sysemu/block-backend.h"
#include "exec/ram_addr.h"
#include "qemu/log.h"
#include "qemu/module.h"
@ -1141,6 +1152,26 @@ static void nvme_write_bar(NvmeCtrl *n, hwaddr offset, uint64_t data,
NVME_GUEST_ERR(nvme_ub_mmiowr_cmbsz_readonly,
"invalid write to read only CMBSZ, ignored");
return;
case 0xE00: /* PMRCAP */
NVME_GUEST_ERR(nvme_ub_mmiowr_pmrcap_readonly,
"invalid write to PMRCAP register, ignored");
return;
case 0xE04: /* TODO PMRCTL */
break;
case 0xE08: /* PMRSTS */
NVME_GUEST_ERR(nvme_ub_mmiowr_pmrsts_readonly,
"invalid write to PMRSTS register, ignored");
return;
case 0xE0C: /* PMREBS */
NVME_GUEST_ERR(nvme_ub_mmiowr_pmrebs_readonly,
"invalid write to PMREBS register, ignored");
return;
case 0xE10: /* PMRSWTP */
NVME_GUEST_ERR(nvme_ub_mmiowr_pmrswtp_readonly,
"invalid write to PMRSWTP register, ignored");
return;
case 0xE14: /* TODO PMRMSC */
break;
default:
NVME_GUEST_ERR(nvme_ub_mmiowr_invalid,
"invalid MMIO write,"
@ -1169,6 +1200,16 @@ static uint64_t nvme_mmio_read(void *opaque, hwaddr addr, unsigned size)
}
if (addr < sizeof(n->bar)) {
/*
* When PMRWBM bit 1 is set then read from
* from PMRSTS should ensure prior writes
* made it to persistent media
*/
if (addr == 0xE08 &&
(NVME_PMRCAP_PMRWBM(n->bar.pmrcap) & 0x02)) {
qemu_ram_writeback(n->pmrdev->mr.ram_block,
0, n->pmrdev->size);
}
memcpy(&val, ptr + addr, size);
} else {
NVME_GUEST_ERR(nvme_ub_mmiord_invalid_ofs,
@ -1332,6 +1373,23 @@ static void nvme_realize(PCIDevice *pci_dev, Error **errp)
error_setg(errp, "serial property not set");
return;
}
if (!n->cmb_size_mb && n->pmrdev) {
if (host_memory_backend_is_mapped(n->pmrdev)) {
char *path = object_get_canonical_path_component(OBJECT(n->pmrdev));
error_setg(errp, "can't use already busy memdev: %s", path);
g_free(path);
return;
}
if (!is_power_of_2(n->pmrdev->size)) {
error_setg(errp, "pmr backend size needs to be power of 2 in size");
return;
}
host_memory_backend_set_mapped(n->pmrdev, true);
}
blkconf_blocksizes(&n->conf);
if (!blkconf_apply_backend_options(&n->conf, blk_is_read_only(n->conf.blk),
false, errp)) {
@ -1415,6 +1473,51 @@ static void nvme_realize(PCIDevice *pci_dev, Error **errp)
PCI_BASE_ADDRESS_SPACE_MEMORY | PCI_BASE_ADDRESS_MEM_TYPE_64 |
PCI_BASE_ADDRESS_MEM_PREFETCH, &n->ctrl_mem);
} else if (n->pmrdev) {
/* Controller Capabilities register */
NVME_CAP_SET_PMRS(n->bar.cap, 1);
/* PMR Capabities register */
n->bar.pmrcap = 0;
NVME_PMRCAP_SET_RDS(n->bar.pmrcap, 0);
NVME_PMRCAP_SET_WDS(n->bar.pmrcap, 0);
NVME_PMRCAP_SET_BIR(n->bar.pmrcap, 2);
NVME_PMRCAP_SET_PMRTU(n->bar.pmrcap, 0);
/* Turn on bit 1 support */
NVME_PMRCAP_SET_PMRWBM(n->bar.pmrcap, 0x02);
NVME_PMRCAP_SET_PMRTO(n->bar.pmrcap, 0);
NVME_PMRCAP_SET_CMSS(n->bar.pmrcap, 0);
/* PMR Control register */
n->bar.pmrctl = 0;
NVME_PMRCTL_SET_EN(n->bar.pmrctl, 0);
/* PMR Status register */
n->bar.pmrsts = 0;
NVME_PMRSTS_SET_ERR(n->bar.pmrsts, 0);
NVME_PMRSTS_SET_NRDY(n->bar.pmrsts, 0);
NVME_PMRSTS_SET_HSTS(n->bar.pmrsts, 0);
NVME_PMRSTS_SET_CBAI(n->bar.pmrsts, 0);
/* PMR Elasticity Buffer Size register */
n->bar.pmrebs = 0;
NVME_PMREBS_SET_PMRSZU(n->bar.pmrebs, 0);
NVME_PMREBS_SET_RBB(n->bar.pmrebs, 0);
NVME_PMREBS_SET_PMRWBZ(n->bar.pmrebs, 0);
/* PMR Sustained Write Throughput register */
n->bar.pmrswtp = 0;
NVME_PMRSWTP_SET_PMRSWTU(n->bar.pmrswtp, 0);
NVME_PMRSWTP_SET_PMRSWTV(n->bar.pmrswtp, 0);
/* PMR Memory Space Control register */
n->bar.pmrmsc = 0;
NVME_PMRMSC_SET_CMSE(n->bar.pmrmsc, 0);
NVME_PMRMSC_SET_CBA(n->bar.pmrmsc, 0);
pci_register_bar(pci_dev, NVME_PMRCAP_BIR(n->bar.pmrcap),
PCI_BASE_ADDRESS_SPACE_MEMORY | PCI_BASE_ADDRESS_MEM_TYPE_64 |
PCI_BASE_ADDRESS_MEM_PREFETCH, &n->pmrdev->mr);
}
for (i = 0; i < n->num_namespaces; i++) {
@ -1445,11 +1548,17 @@ static void nvme_exit(PCIDevice *pci_dev)
if (n->cmb_size_mb) {
g_free(n->cmbuf);
}
if (n->pmrdev) {
host_memory_backend_set_mapped(n->pmrdev, false);
}
msix_uninit_exclusive_bar(pci_dev);
}
static Property nvme_props[] = {
DEFINE_BLOCK_PROPERTIES(NvmeCtrl, conf),
DEFINE_PROP_LINK("pmrdev", NvmeCtrl, pmrdev, TYPE_MEMORY_BACKEND,
HostMemoryBackend *),
DEFINE_PROP_STRING("serial", NvmeCtrl, serial),
DEFINE_PROP_UINT32("cmb_size_mb", NvmeCtrl, cmb_size_mb, 0),
DEFINE_PROP_UINT32("num_queues", NvmeCtrl, num_queues, 64),

2
hw/block/nvme.h
View file

@ -83,6 +83,8 @@ typedef struct NvmeCtrl {
uint64_t timestamp_set_qemu_clock_ms; /* QEMU clock time */
char *serial;
HostMemoryBackend *pmrdev;
NvmeNamespace *namespaces;
NvmeSQueue **sq;
NvmeCQueue **cq;

4
hw/block/trace-events
View file

@ -110,6 +110,10 @@ nvme_ub_mmiowr_ssreset_w1c_unsupported(void) "attempted to W1C CSTS.NSSRO but CA
nvme_ub_mmiowr_ssreset_unsupported(void) "attempted NVM subsystem reset but CAP.NSSRS is zero (not supported)"
nvme_ub_mmiowr_cmbloc_reserved(void) "invalid write to reserved CMBLOC when CMBSZ is zero, ignored"
nvme_ub_mmiowr_cmbsz_readonly(void) "invalid write to read only CMBSZ, ignored"
nvme_ub_mmiowr_pmrcap_readonly(void) "invalid write to read only PMRCAP, ignored"
nvme_ub_mmiowr_pmrsts_readonly(void) "invalid write to read only PMRSTS, ignored"
nvme_ub_mmiowr_pmrebs_readonly(void) "invalid write to read only PMREBS, ignored"
nvme_ub_mmiowr_pmrswtp_readonly(void) "invalid write to read only PMRSWTP, ignored"
nvme_ub_mmiowr_invalid(uint64_t offset, uint64_t data) "invalid MMIO write, offset=0x%"PRIx64", data=0x%"PRIx64""
nvme_ub_mmiord_misaligned32(uint64_t offset) "MMIO read not 32-bit aligned, offset=0x%"PRIx64""
nvme_ub_mmiord_toosmall(uint64_t offset) "MMIO read smaller than 32-bits, offset=0x%"PRIx64""