This adds support for multiple namespaces by introducing a new 'nvme-ns' device model. The nvme device creates a bus named from the device name ('id'). The nvme-ns devices then connect to this and registers themselves with the nvme device. This changes how an nvme device is created. Example with two namespaces: -drive file=nvme0n1.img,if=none,id=disk1 -drive file=nvme0n2.img,if=none,id=disk2 -device nvme,serial=deadbeef,id=nvme0 -device nvme-ns,drive=disk1,bus=nvme0,nsid=1 -device nvme-ns,drive=disk2,bus=nvme0,nsid=2 The drive property is kept on the nvme device to keep the change backward compatible, but the property is now optional. Specifying a drive for the nvme device will always create the namespace with nsid 1. Signed-off-by: Klaus Jensen <k.jensen@samsung.com> Reviewed-by: Keith Busch <kbusch@kernel.org> Reviewed-by: Minwoo Im <minwoo.im.dev@gmail.com>
168 lines
3.8 KiB
C
168 lines
3.8 KiB
C
/*
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* QEMU NVM Express Virtual Namespace
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*
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* Copyright (c) 2019 CNEX Labs
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* Copyright (c) 2020 Samsung Electronics
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*
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* Authors:
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* Klaus Jensen <k.jensen@samsung.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2. See the
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* COPYING file in the top-level directory.
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*
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*/
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#include "qemu/osdep.h"
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#include "qemu/units.h"
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#include "qemu/cutils.h"
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#include "qemu/log.h"
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#include "hw/block/block.h"
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#include "hw/pci/pci.h"
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#include "sysemu/sysemu.h"
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#include "sysemu/block-backend.h"
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#include "qapi/error.h"
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#include "hw/qdev-properties.h"
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#include "hw/qdev-core.h"
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#include "nvme.h"
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#include "nvme-ns.h"
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static void nvme_ns_init(NvmeNamespace *ns)
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{
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NvmeIdNs *id_ns = &ns->id_ns;
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if (blk_get_flags(ns->blkconf.blk) & BDRV_O_UNMAP) {
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ns->id_ns.dlfeat = 0x9;
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}
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id_ns->lbaf[0].ds = BDRV_SECTOR_BITS;
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id_ns->nsze = cpu_to_le64(nvme_ns_nlbas(ns));
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/* no thin provisioning */
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id_ns->ncap = id_ns->nsze;
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id_ns->nuse = id_ns->ncap;
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}
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static int nvme_ns_init_blk(NvmeCtrl *n, NvmeNamespace *ns, Error **errp)
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{
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if (!blkconf_blocksizes(&ns->blkconf, errp)) {
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return -1;
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}
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if (!blkconf_apply_backend_options(&ns->blkconf,
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blk_is_read_only(ns->blkconf.blk),
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false, errp)) {
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return -1;
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}
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ns->size = blk_getlength(ns->blkconf.blk);
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if (ns->size < 0) {
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error_setg_errno(errp, -ns->size, "could not get blockdev size");
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return -1;
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}
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if (blk_enable_write_cache(ns->blkconf.blk)) {
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n->features.vwc = 0x1;
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}
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return 0;
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}
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static int nvme_ns_check_constraints(NvmeNamespace *ns, Error **errp)
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{
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if (!ns->blkconf.blk) {
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error_setg(errp, "block backend not configured");
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return -1;
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}
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return 0;
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}
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int nvme_ns_setup(NvmeCtrl *n, NvmeNamespace *ns, Error **errp)
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{
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if (nvme_ns_check_constraints(ns, errp)) {
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return -1;
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}
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if (nvme_ns_init_blk(n, ns, errp)) {
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return -1;
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}
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nvme_ns_init(ns);
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if (nvme_register_namespace(n, ns, errp)) {
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return -1;
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}
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return 0;
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}
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void nvme_ns_drain(NvmeNamespace *ns)
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{
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blk_drain(ns->blkconf.blk);
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}
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void nvme_ns_flush(NvmeNamespace *ns)
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{
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blk_flush(ns->blkconf.blk);
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}
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static void nvme_ns_realize(DeviceState *dev, Error **errp)
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{
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NvmeNamespace *ns = NVME_NS(dev);
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BusState *s = qdev_get_parent_bus(dev);
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NvmeCtrl *n = NVME(s->parent);
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Error *local_err = NULL;
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if (nvme_ns_setup(n, ns, &local_err)) {
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error_propagate_prepend(errp, local_err,
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"could not setup namespace: ");
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return;
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}
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}
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static Property nvme_ns_props[] = {
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DEFINE_BLOCK_PROPERTIES(NvmeNamespace, blkconf),
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DEFINE_PROP_UINT32("nsid", NvmeNamespace, params.nsid, 0),
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DEFINE_PROP_END_OF_LIST(),
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};
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static void nvme_ns_class_init(ObjectClass *oc, void *data)
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{
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DeviceClass *dc = DEVICE_CLASS(oc);
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set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
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dc->bus_type = TYPE_NVME_BUS;
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dc->realize = nvme_ns_realize;
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device_class_set_props(dc, nvme_ns_props);
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dc->desc = "Virtual NVMe namespace";
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}
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static void nvme_ns_instance_init(Object *obj)
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{
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NvmeNamespace *ns = NVME_NS(obj);
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char *bootindex = g_strdup_printf("/namespace@%d,0", ns->params.nsid);
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device_add_bootindex_property(obj, &ns->bootindex, "bootindex",
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bootindex, DEVICE(obj));
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g_free(bootindex);
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}
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static const TypeInfo nvme_ns_info = {
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.name = TYPE_NVME_NS,
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.parent = TYPE_DEVICE,
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.class_init = nvme_ns_class_init,
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.instance_size = sizeof(NvmeNamespace),
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.instance_init = nvme_ns_instance_init,
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};
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static void nvme_ns_register_types(void)
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{
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type_register_static(&nvme_ns_info);
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}
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type_init(nvme_ns_register_types)
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