Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1294 insertions, 0 deletions

diff --git a/drivers/nvme/host/lightnvm.c b/drivers/nvme/host/lightnvm.c
new file mode 100644
index 000000000..d10257b9c
--- /dev/null
+++ b/drivers/nvme/host/lightnvm.c
@@ -0,0 +1,1294 @@
+/*
+ * nvme-lightnvm.c - LightNVM NVMe device
+ *
+ * Copyright (C) 2014-2015 IT University of Copenhagen
+ * Initial release: Matias Bjorling <mb@lightnvm.io>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version
+ * 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; see the file COPYING.  If not, write to
+ * the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139,
+ * USA.
+ *
+ */
+
+#include "nvme.h"
+
+#include <linux/nvme.h>
+#include <linux/bitops.h>
+#include <linux/lightnvm.h>
+#include <linux/vmalloc.h>
+#include <linux/sched/sysctl.h>
+#include <uapi/linux/lightnvm.h>
+
+enum nvme_nvm_admin_opcode {
+	nvme_nvm_admin_identity		= 0xe2,
+	nvme_nvm_admin_get_bb_tbl	= 0xf2,
+	nvme_nvm_admin_set_bb_tbl	= 0xf1,
+};
+
+enum nvme_nvm_log_page {
+	NVME_NVM_LOG_REPORT_CHUNK	= 0xca,
+};
+
+struct nvme_nvm_ph_rw {
+	__u8			opcode;
+	__u8			flags;
+	__u16			command_id;
+	__le32			nsid;
+	__u64			rsvd2;
+	__le64			metadata;
+	__le64			prp1;
+	__le64			prp2;
+	__le64			spba;
+	__le16			length;
+	__le16			control;
+	__le32			dsmgmt;
+	__le64			resv;
+};
+
+struct nvme_nvm_erase_blk {
+	__u8			opcode;
+	__u8			flags;
+	__u16			command_id;
+	__le32			nsid;
+	__u64			rsvd[2];
+	__le64			prp1;
+	__le64			prp2;
+	__le64			spba;
+	__le16			length;
+	__le16			control;
+	__le32			dsmgmt;
+	__le64			resv;
+};
+
+struct nvme_nvm_identity {
+	__u8			opcode;
+	__u8			flags;
+	__u16			command_id;
+	__le32			nsid;
+	__u64			rsvd[2];
+	__le64			prp1;
+	__le64			prp2;
+	__u32			rsvd11[6];
+};
+
+struct nvme_nvm_getbbtbl {
+	__u8			opcode;
+	__u8			flags;
+	__u16			command_id;
+	__le32			nsid;
+	__u64			rsvd[2];
+	__le64			prp1;
+	__le64			prp2;
+	__le64			spba;
+	__u32			rsvd4[4];
+};
+
+struct nvme_nvm_setbbtbl {
+	__u8			opcode;
+	__u8			flags;
+	__u16			command_id;
+	__le32			nsid;
+	__le64			rsvd[2];
+	__le64			prp1;
+	__le64			prp2;
+	__le64			spba;
+	__le16			nlb;
+	__u8			value;
+	__u8			rsvd3;
+	__u32			rsvd4[3];
+};
+
+struct nvme_nvm_command {
+	union {
+		struct nvme_common_command common;
+		struct nvme_nvm_ph_rw ph_rw;
+		struct nvme_nvm_erase_blk erase;
+		struct nvme_nvm_identity identity;
+		struct nvme_nvm_getbbtbl get_bb;
+		struct nvme_nvm_setbbtbl set_bb;
+	};
+};
+
+struct nvme_nvm_id12_grp {
+	__u8			mtype;
+	__u8			fmtype;
+	__le16			res16;
+	__u8			num_ch;
+	__u8			num_lun;
+	__u8			num_pln;
+	__u8			rsvd1;
+	__le16			num_chk;
+	__le16			num_pg;
+	__le16			fpg_sz;
+	__le16			csecs;
+	__le16			sos;
+	__le16			rsvd2;
+	__le32			trdt;
+	__le32			trdm;
+	__le32			tprt;
+	__le32			tprm;
+	__le32			tbet;
+	__le32			tbem;
+	__le32			mpos;
+	__le32			mccap;
+	__le16			cpar;
+	__u8			reserved[906];
+} __packed;
+
+struct nvme_nvm_id12_addrf {
+	__u8			ch_offset;
+	__u8			ch_len;
+	__u8			lun_offset;
+	__u8			lun_len;
+	__u8			pln_offset;
+	__u8			pln_len;
+	__u8			blk_offset;
+	__u8			blk_len;
+	__u8			pg_offset;
+	__u8			pg_len;
+	__u8			sec_offset;
+	__u8			sec_len;
+	__u8			res[4];
+} __packed;
+
+struct nvme_nvm_id12 {
+	__u8			ver_id;
+	__u8			vmnt;
+	__u8			cgrps;
+	__u8			res;
+	__le32			cap;
+	__le32			dom;
+	struct nvme_nvm_id12_addrf ppaf;
+	__u8			resv[228];
+	struct nvme_nvm_id12_grp grp;
+	__u8			resv2[2880];
+} __packed;
+
+struct nvme_nvm_bb_tbl {
+	__u8	tblid[4];
+	__le16	verid;
+	__le16	revid;
+	__le32	rvsd1;
+	__le32	tblks;
+	__le32	tfact;
+	__le32	tgrown;
+	__le32	tdresv;
+	__le32	thresv;
+	__le32	rsvd2[8];
+	__u8	blk[0];
+};
+
+struct nvme_nvm_id20_addrf {
+	__u8			grp_len;
+	__u8			pu_len;
+	__u8			chk_len;
+	__u8			lba_len;
+	__u8			resv[4];
+};
+
+struct nvme_nvm_id20 {
+	__u8			mjr;
+	__u8			mnr;
+	__u8			resv[6];
+
+	struct nvme_nvm_id20_addrf lbaf;
+
+	__le32			mccap;
+	__u8			resv2[12];
+
+	__u8			wit;
+	__u8			resv3[31];
+
+	/* Geometry */
+	__le16			num_grp;
+	__le16			num_pu;
+	__le32			num_chk;
+	__le32			clba;
+	__u8			resv4[52];
+
+	/* Write data requirements */
+	__le32			ws_min;
+	__le32			ws_opt;
+	__le32			mw_cunits;
+	__le32			maxoc;
+	__le32			maxocpu;
+	__u8			resv5[44];
+
+	/* Performance related metrics */
+	__le32			trdt;
+	__le32			trdm;
+	__le32			twrt;
+	__le32			twrm;
+	__le32			tcrst;
+	__le32			tcrsm;
+	__u8			resv6[40];
+
+	/* Reserved area */
+	__u8			resv7[2816];
+
+	/* Vendor specific */
+	__u8			vs[1024];
+};
+
+struct nvme_nvm_chk_meta {
+	__u8	state;
+	__u8	type;
+	__u8	wi;
+	__u8	rsvd[5];
+	__le64	slba;
+	__le64	cnlb;
+	__le64	wp;
+};
+
+/*
+ * Check we didn't inadvertently grow the command struct
+ */
+static inline void _nvme_nvm_check_size(void)
+{
+	BUILD_BUG_ON(sizeof(struct nvme_nvm_identity) != 64);
+	BUILD_BUG_ON(sizeof(struct nvme_nvm_ph_rw) != 64);
+	BUILD_BUG_ON(sizeof(struct nvme_nvm_erase_blk) != 64);
+	BUILD_BUG_ON(sizeof(struct nvme_nvm_getbbtbl) != 64);
+	BUILD_BUG_ON(sizeof(struct nvme_nvm_setbbtbl) != 64);
+	BUILD_BUG_ON(sizeof(struct nvme_nvm_id12_grp) != 960);
+	BUILD_BUG_ON(sizeof(struct nvme_nvm_id12_addrf) != 16);
+	BUILD_BUG_ON(sizeof(struct nvme_nvm_id12) != NVME_IDENTIFY_DATA_SIZE);
+	BUILD_BUG_ON(sizeof(struct nvme_nvm_bb_tbl) != 64);
+	BUILD_BUG_ON(sizeof(struct nvme_nvm_id20_addrf) != 8);
+	BUILD_BUG_ON(sizeof(struct nvme_nvm_id20) != NVME_IDENTIFY_DATA_SIZE);
+	BUILD_BUG_ON(sizeof(struct nvme_nvm_chk_meta) != 32);
+	BUILD_BUG_ON(sizeof(struct nvme_nvm_chk_meta) !=
+						sizeof(struct nvm_chk_meta));
+}
+
+static void nvme_nvm_set_addr_12(struct nvm_addrf_12 *dst,
+				 struct nvme_nvm_id12_addrf *src)
+{
+	dst->ch_len = src->ch_len;
+	dst->lun_len = src->lun_len;
+	dst->blk_len = src->blk_len;
+	dst->pg_len = src->pg_len;
+	dst->pln_len = src->pln_len;
+	dst->sec_len = src->sec_len;
+
+	dst->ch_offset = src->ch_offset;
+	dst->lun_offset = src->lun_offset;
+	dst->blk_offset = src->blk_offset;
+	dst->pg_offset = src->pg_offset;
+	dst->pln_offset = src->pln_offset;
+	dst->sec_offset = src->sec_offset;
+
+	dst->ch_mask = ((1ULL << dst->ch_len) - 1) << dst->ch_offset;
+	dst->lun_mask = ((1ULL << dst->lun_len) - 1) << dst->lun_offset;
+	dst->blk_mask = ((1ULL << dst->blk_len) - 1) << dst->blk_offset;
+	dst->pg_mask = ((1ULL << dst->pg_len) - 1) << dst->pg_offset;
+	dst->pln_mask = ((1ULL << dst->pln_len) - 1) << dst->pln_offset;
+	dst->sec_mask = ((1ULL << dst->sec_len) - 1) << dst->sec_offset;
+}
+
+static int nvme_nvm_setup_12(struct nvme_nvm_id12 *id,
+			     struct nvm_geo *geo)
+{
+	struct nvme_nvm_id12_grp *src;
+	int sec_per_pg, sec_per_pl, pg_per_blk;
+
+	if (id->cgrps != 1)
+		return -EINVAL;
+
+	src = &id->grp;
+
+	if (src->mtype != 0) {
+		pr_err("nvm: memory type not supported\n");
+		return -EINVAL;
+	}
+
+	/* 1.2 spec. only reports a single version id - unfold */
+	geo->major_ver_id = id->ver_id;
+	geo->minor_ver_id = 2;
+
+	/* Set compacted version for upper layers */
+	geo->version = NVM_OCSSD_SPEC_12;
+
+	geo->num_ch = src->num_ch;
+	geo->num_lun = src->num_lun;
+	geo->all_luns = geo->num_ch * geo->num_lun;
+
+	geo->num_chk = le16_to_cpu(src->num_chk);
+
+	geo->csecs = le16_to_cpu(src->csecs);
+	geo->sos = le16_to_cpu(src->sos);
+
+	pg_per_blk = le16_to_cpu(src->num_pg);
+	sec_per_pg = le16_to_cpu(src->fpg_sz) / geo->csecs;
+	sec_per_pl = sec_per_pg * src->num_pln;
+	geo->clba = sec_per_pl * pg_per_blk;
+
+	geo->all_chunks = geo->all_luns * geo->num_chk;
+	geo->total_secs = geo->clba * geo->all_chunks;
+
+	geo->ws_min = sec_per_pg;
+	geo->ws_opt = sec_per_pg;
+	geo->mw_cunits = geo->ws_opt << 3;	/* default to MLC safe values */
+
+	/* Do not impose values for maximum number of open blocks as it is
+	 * unspecified in 1.2. Users of 1.2 must be aware of this and eventually
+	 * specify these values through a quirk if restrictions apply.
+	 */
+	geo->maxoc = geo->all_luns * geo->num_chk;
+	geo->maxocpu = geo->num_chk;
+
+	geo->mccap = le32_to_cpu(src->mccap);
+
+	geo->trdt = le32_to_cpu(src->trdt);
+	geo->trdm = le32_to_cpu(src->trdm);
+	geo->tprt = le32_to_cpu(src->tprt);
+	geo->tprm = le32_to_cpu(src->tprm);
+	geo->tbet = le32_to_cpu(src->tbet);
+	geo->tbem = le32_to_cpu(src->tbem);
+
+	/* 1.2 compatibility */
+	geo->vmnt = id->vmnt;
+	geo->cap = le32_to_cpu(id->cap);
+	geo->dom = le32_to_cpu(id->dom);
+
+	geo->mtype = src->mtype;
+	geo->fmtype = src->fmtype;
+
+	geo->cpar = le16_to_cpu(src->cpar);
+	geo->mpos = le32_to_cpu(src->mpos);
+
+	geo->pln_mode = NVM_PLANE_SINGLE;
+
+	if (geo->mpos & 0x020202) {
+		geo->pln_mode = NVM_PLANE_DOUBLE;
+		geo->ws_opt <<= 1;
+	} else if (geo->mpos & 0x040404) {
+		geo->pln_mode = NVM_PLANE_QUAD;
+		geo->ws_opt <<= 2;
+	}
+
+	geo->num_pln = src->num_pln;
+	geo->num_pg = le16_to_cpu(src->num_pg);
+	geo->fpg_sz = le16_to_cpu(src->fpg_sz);
+
+	nvme_nvm_set_addr_12((struct nvm_addrf_12 *)&geo->addrf, &id->ppaf);
+
+	return 0;
+}
+
+static void nvme_nvm_set_addr_20(struct nvm_addrf *dst,
+				 struct nvme_nvm_id20_addrf *src)
+{
+	dst->ch_len = src->grp_len;
+	dst->lun_len = src->pu_len;
+	dst->chk_len = src->chk_len;
+	dst->sec_len = src->lba_len;
+
+	dst->sec_offset = 0;
+	dst->chk_offset = dst->sec_len;
+	dst->lun_offset = dst->chk_offset + dst->chk_len;
+	dst->ch_offset = dst->lun_offset + dst->lun_len;
+
+	dst->ch_mask = ((1ULL << dst->ch_len) - 1) << dst->ch_offset;
+	dst->lun_mask = ((1ULL << dst->lun_len) - 1) << dst->lun_offset;
+	dst->chk_mask = ((1ULL << dst->chk_len) - 1) << dst->chk_offset;
+	dst->sec_mask = ((1ULL << dst->sec_len) - 1) << dst->sec_offset;
+}
+
+static int nvme_nvm_setup_20(struct nvme_nvm_id20 *id,
+			     struct nvm_geo *geo)
+{
+	geo->major_ver_id = id->mjr;
+	geo->minor_ver_id = id->mnr;
+
+	/* Set compacted version for upper layers */
+	geo->version = NVM_OCSSD_SPEC_20;
+
+	geo->num_ch = le16_to_cpu(id->num_grp);
+	geo->num_lun = le16_to_cpu(id->num_pu);
+	geo->all_luns = geo->num_ch * geo->num_lun;
+
+	geo->num_chk = le32_to_cpu(id->num_chk);
+	geo->clba = le32_to_cpu(id->clba);
+
+	geo->all_chunks = geo->all_luns * geo->num_chk;
+	geo->total_secs = geo->clba * geo->all_chunks;
+
+	geo->ws_min = le32_to_cpu(id->ws_min);
+	geo->ws_opt = le32_to_cpu(id->ws_opt);
+	geo->mw_cunits = le32_to_cpu(id->mw_cunits);
+	geo->maxoc = le32_to_cpu(id->maxoc);
+	geo->maxocpu = le32_to_cpu(id->maxocpu);
+
+	geo->trdt = le32_to_cpu(id->trdt);
+	geo->trdm = le32_to_cpu(id->trdm);
+	geo->tprt = le32_to_cpu(id->twrt);
+	geo->tprm = le32_to_cpu(id->twrm);
+	geo->tbet = le32_to_cpu(id->tcrst);
+	geo->tbem = le32_to_cpu(id->tcrsm);
+
+	nvme_nvm_set_addr_20(&geo->addrf, &id->lbaf);
+
+	return 0;
+}
+
+static int nvme_nvm_identity(struct nvm_dev *nvmdev)
+{
+	struct nvme_ns *ns = nvmdev->q->queuedata;
+	struct nvme_nvm_id12 *id;
+	struct nvme_nvm_command c = {};
+	int ret;
+
+	c.identity.opcode = nvme_nvm_admin_identity;
+	c.identity.nsid = cpu_to_le32(ns->head->ns_id);
+
+	id = kmalloc(sizeof(struct nvme_nvm_id12), GFP_KERNEL);
+	if (!id)
+		return -ENOMEM;
+
+	ret = nvme_submit_sync_cmd(ns->ctrl->admin_q, (struct nvme_command *)&c,
+				id, sizeof(struct nvme_nvm_id12));
+	if (ret) {
+		ret = -EIO;
+		goto out;
+	}
+
+	/*
+	 * The 1.2 and 2.0 specifications share the first byte in their geometry
+	 * command to make it possible to know what version a device implements.
+	 */
+	switch (id->ver_id) {
+	case 1:
+		ret = nvme_nvm_setup_12(id, &nvmdev->geo);
+		break;
+	case 2:
+		ret = nvme_nvm_setup_20((struct nvme_nvm_id20 *)id,
+							&nvmdev->geo);
+		break;
+	default:
+		dev_err(ns->ctrl->device, "OCSSD revision not supported (%d)\n",
+							id->ver_id);
+		ret = -EINVAL;
+	}
+
+out:
+	kfree(id);
+	return ret;
+}
+
+static int nvme_nvm_get_bb_tbl(struct nvm_dev *nvmdev, struct ppa_addr ppa,
+								u8 *blks)
+{
+	struct request_queue *q = nvmdev->q;
+	struct nvm_geo *geo = &nvmdev->geo;
+	struct nvme_ns *ns = q->queuedata;
+	struct nvme_ctrl *ctrl = ns->ctrl;
+	struct nvme_nvm_command c = {};
+	struct nvme_nvm_bb_tbl *bb_tbl;
+	int nr_blks = geo->num_chk * geo->num_pln;
+	int tblsz = sizeof(struct nvme_nvm_bb_tbl) + nr_blks;
+	int ret = 0;
+
+	c.get_bb.opcode = nvme_nvm_admin_get_bb_tbl;
+	c.get_bb.nsid = cpu_to_le32(ns->head->ns_id);
+	c.get_bb.spba = cpu_to_le64(ppa.ppa);
+
+	bb_tbl = kzalloc(tblsz, GFP_KERNEL);
+	if (!bb_tbl)
+		return -ENOMEM;
+
+	ret = nvme_submit_sync_cmd(ctrl->admin_q, (struct nvme_command *)&c,
+								bb_tbl, tblsz);
+	if (ret) {
+		dev_err(ctrl->device, "get bad block table failed (%d)\n", ret);
+		ret = -EIO;
+		goto out;
+	}
+
+	if (bb_tbl->tblid[0] != 'B' || bb_tbl->tblid[1] != 'B' ||
+		bb_tbl->tblid[2] != 'L' || bb_tbl->tblid[3] != 'T') {
+		dev_err(ctrl->device, "bbt format mismatch\n");
+		ret = -EINVAL;
+		goto out;
+	}
+
+	if (le16_to_cpu(bb_tbl->verid) != 1) {
+		ret = -EINVAL;
+		dev_err(ctrl->device, "bbt version not supported\n");
+		goto out;
+	}
+
+	if (le32_to_cpu(bb_tbl->tblks) != nr_blks) {
+		ret = -EINVAL;
+		dev_err(ctrl->device,
+				"bbt unsuspected blocks returned (%u!=%u)",
+				le32_to_cpu(bb_tbl->tblks), nr_blks);
+		goto out;
+	}
+
+	memcpy(blks, bb_tbl->blk, geo->num_chk * geo->num_pln);
+out:
+	kfree(bb_tbl);
+	return ret;
+}
+
+static int nvme_nvm_set_bb_tbl(struct nvm_dev *nvmdev, struct ppa_addr *ppas,
+							int nr_ppas, int type)
+{
+	struct nvme_ns *ns = nvmdev->q->queuedata;
+	struct nvme_nvm_command c = {};
+	int ret = 0;
+
+	c.set_bb.opcode = nvme_nvm_admin_set_bb_tbl;
+	c.set_bb.nsid = cpu_to_le32(ns->head->ns_id);
+	c.set_bb.spba = cpu_to_le64(ppas->ppa);
+	c.set_bb.nlb = cpu_to_le16(nr_ppas - 1);
+	c.set_bb.value = type;
+
+	ret = nvme_submit_sync_cmd(ns->ctrl->admin_q, (struct nvme_command *)&c,
+								NULL, 0);
+	if (ret)
+		dev_err(ns->ctrl->device, "set bad block table failed (%d)\n",
+									ret);
+	return ret;
+}
+
+/*
+ * Expect the lba in device format
+ */
+static int nvme_nvm_get_chk_meta(struct nvm_dev *ndev,
+				 struct nvm_chk_meta *meta,
+				 sector_t slba, int nchks)
+{
+	struct nvm_geo *geo = &ndev->geo;
+	struct nvme_ns *ns = ndev->q->queuedata;
+	struct nvme_ctrl *ctrl = ns->ctrl;
+	struct nvme_nvm_chk_meta *dev_meta = (struct nvme_nvm_chk_meta *)meta;
+	struct ppa_addr ppa;
+	size_t left = nchks * sizeof(struct nvme_nvm_chk_meta);
+	size_t log_pos, offset, len;
+	int ret, i, max_len;
+
+	/*
+	 * limit requests to maximum 256K to avoid issuing arbitrary large
+	 * requests when the device does not specific a maximum transfer size.
+	 */
+	max_len = min_t(unsigned int, ctrl->max_hw_sectors << 9, 256 * 1024);
+
+	/* Normalize lba address space to obtain log offset */
+	ppa.ppa = slba;
+	ppa = dev_to_generic_addr(ndev, ppa);
+
+	log_pos = ppa.m.chk;
+	log_pos += ppa.m.pu * geo->num_chk;
+	log_pos += ppa.m.grp * geo->num_lun * geo->num_chk;
+
+	offset = log_pos * sizeof(struct nvme_nvm_chk_meta);
+
+	while (left) {
+		len = min_t(unsigned int, left, max_len);
+
+		ret = nvme_get_log(ctrl, ns->head->ns_id,
+				NVME_NVM_LOG_REPORT_CHUNK, 0, dev_meta, len,
+				offset);
+		if (ret) {
+			dev_err(ctrl->device, "Get REPORT CHUNK log error\n");
+			break;
+		}
+
+		for (i = 0; i < len; i += sizeof(struct nvme_nvm_chk_meta)) {
+			meta->state = dev_meta->state;
+			meta->type = dev_meta->type;
+			meta->wi = dev_meta->wi;
+			meta->slba = le64_to_cpu(dev_meta->slba);
+			meta->cnlb = le64_to_cpu(dev_meta->cnlb);
+			meta->wp = le64_to_cpu(dev_meta->wp);
+
+			meta++;
+			dev_meta++;
+		}
+
+		offset += len;
+		left -= len;
+	}
+
+	return ret;
+}
+
+static inline void nvme_nvm_rqtocmd(struct nvm_rq *rqd, struct nvme_ns *ns,
+				    struct nvme_nvm_command *c)
+{
+	c->ph_rw.opcode = rqd->opcode;
+	c->ph_rw.nsid = cpu_to_le32(ns->head->ns_id);
+	c->ph_rw.spba = cpu_to_le64(rqd->ppa_addr.ppa);
+	c->ph_rw.metadata = cpu_to_le64(rqd->dma_meta_list);
+	c->ph_rw.control = cpu_to_le16(rqd->flags);
+	c->ph_rw.length = cpu_to_le16(rqd->nr_ppas - 1);
+}
+
+static void nvme_nvm_end_io(struct request *rq, blk_status_t status)
+{
+	struct nvm_rq *rqd = rq->end_io_data;
+
+	rqd->ppa_status = le64_to_cpu(nvme_req(rq)->result.u64);
+	rqd->error = nvme_req(rq)->status;
+	nvm_end_io(rqd);
+
+	kfree(nvme_req(rq)->cmd);
+	blk_mq_free_request(rq);
+}
+
+static struct request *nvme_nvm_alloc_request(struct request_queue *q,
+					      struct nvm_rq *rqd,
+					      struct nvme_nvm_command *cmd)
+{
+	struct nvme_ns *ns = q->queuedata;
+	struct request *rq;
+
+	nvme_nvm_rqtocmd(rqd, ns, cmd);
+
+	rq = nvme_alloc_request(q, (struct nvme_command *)cmd, 0, NVME_QID_ANY);
+	if (IS_ERR(rq))
+		return rq;
+
+	rq->cmd_flags &= ~REQ_FAILFAST_DRIVER;
+
+	if (rqd->bio)
+		blk_init_request_from_bio(rq, rqd->bio);
+	else
+		rq->ioprio = IOPRIO_PRIO_VALUE(IOPRIO_CLASS_BE, IOPRIO_NORM);
+
+	return rq;
+}
+
+static int nvme_nvm_submit_io(struct nvm_dev *dev, struct nvm_rq *rqd)
+{
+	struct request_queue *q = dev->q;
+	struct nvme_nvm_command *cmd;
+	struct request *rq;
+
+	cmd = kzalloc(sizeof(struct nvme_nvm_command), GFP_KERNEL);
+	if (!cmd)
+		return -ENOMEM;
+
+	rq = nvme_nvm_alloc_request(q, rqd, cmd);
+	if (IS_ERR(rq)) {
+		kfree(cmd);
+		return PTR_ERR(rq);
+	}
+
+	rq->end_io_data = rqd;
+
+	blk_execute_rq_nowait(q, NULL, rq, 0, nvme_nvm_end_io);
+
+	return 0;
+}
+
+static int nvme_nvm_submit_io_sync(struct nvm_dev *dev, struct nvm_rq *rqd)
+{
+	struct request_queue *q = dev->q;
+	struct request *rq;
+	struct nvme_nvm_command cmd;
+	int ret = 0;
+
+	memset(&cmd, 0, sizeof(struct nvme_nvm_command));
+
+	rq = nvme_nvm_alloc_request(q, rqd, &cmd);
+	if (IS_ERR(rq))
+		return PTR_ERR(rq);
+
+	/* I/Os can fail and the error is signaled through rqd. Callers must
+	 * handle the error accordingly.
+	 */
+	blk_execute_rq(q, NULL, rq, 0);
+	if (nvme_req(rq)->flags & NVME_REQ_CANCELLED)
+		ret = -EINTR;
+
+	rqd->ppa_status = le64_to_cpu(nvme_req(rq)->result.u64);
+	rqd->error = nvme_req(rq)->status;
+
+	blk_mq_free_request(rq);
+
+	return ret;
+}
+
+static void *nvme_nvm_create_dma_pool(struct nvm_dev *nvmdev, char *name)
+{
+	struct nvme_ns *ns = nvmdev->q->queuedata;
+
+	return dma_pool_create(name, ns->ctrl->dev, PAGE_SIZE, PAGE_SIZE, 0);
+}
+
+static void nvme_nvm_destroy_dma_pool(void *pool)
+{
+	struct dma_pool *dma_pool = pool;
+
+	dma_pool_destroy(dma_pool);
+}
+
+static void *nvme_nvm_dev_dma_alloc(struct nvm_dev *dev, void *pool,
+				    gfp_t mem_flags, dma_addr_t *dma_handler)
+{
+	return dma_pool_alloc(pool, mem_flags, dma_handler);
+}
+
+static void nvme_nvm_dev_dma_free(void *pool, void *addr,
+							dma_addr_t dma_handler)
+{
+	dma_pool_free(pool, addr, dma_handler);
+}
+
+static struct nvm_dev_ops nvme_nvm_dev_ops = {
+	.identity		= nvme_nvm_identity,
+
+	.get_bb_tbl		= nvme_nvm_get_bb_tbl,
+	.set_bb_tbl		= nvme_nvm_set_bb_tbl,
+
+	.get_chk_meta		= nvme_nvm_get_chk_meta,
+
+	.submit_io		= nvme_nvm_submit_io,
+	.submit_io_sync		= nvme_nvm_submit_io_sync,
+
+	.create_dma_pool	= nvme_nvm_create_dma_pool,
+	.destroy_dma_pool	= nvme_nvm_destroy_dma_pool,
+	.dev_dma_alloc		= nvme_nvm_dev_dma_alloc,
+	.dev_dma_free		= nvme_nvm_dev_dma_free,
+};
+
+static int nvme_nvm_submit_user_cmd(struct request_queue *q,
+				struct nvme_ns *ns,
+				struct nvme_nvm_command *vcmd,
+				void __user *ubuf, unsigned int bufflen,
+				void __user *meta_buf, unsigned int meta_len,
+				void __user *ppa_buf, unsigned int ppa_len,
+				u32 *result, u64 *status, unsigned int timeout)
+{
+	bool write = nvme_is_write((struct nvme_command *)vcmd);
+	struct nvm_dev *dev = ns->ndev;
+	struct gendisk *disk = ns->disk;
+	struct request *rq;
+	struct bio *bio = NULL;
+	__le64 *ppa_list = NULL;
+	dma_addr_t ppa_dma;
+	__le64 *metadata = NULL;
+	dma_addr_t metadata_dma;
+	DECLARE_COMPLETION_ONSTACK(wait);
+	int ret = 0;
+
+	rq = nvme_alloc_request(q, (struct nvme_command *)vcmd, 0,
+			NVME_QID_ANY);
+	if (IS_ERR(rq)) {
+		ret = -ENOMEM;
+		goto err_cmd;
+	}
+
+	rq->timeout = timeout ? timeout : ADMIN_TIMEOUT;
+
+	if (ppa_buf && ppa_len) {
+		ppa_list = dma_pool_alloc(dev->dma_pool, GFP_KERNEL, &ppa_dma);
+		if (!ppa_list) {
+			ret = -ENOMEM;
+			goto err_rq;
+		}
+		if (copy_from_user(ppa_list, (void __user *)ppa_buf,
+						sizeof(u64) * (ppa_len + 1))) {
+			ret = -EFAULT;
+			goto err_ppa;
+		}
+		vcmd->ph_rw.spba = cpu_to_le64(ppa_dma);
+	} else {
+		vcmd->ph_rw.spba = cpu_to_le64((uintptr_t)ppa_buf);
+	}
+
+	if (ubuf && bufflen) {
+		ret = blk_rq_map_user(q, rq, NULL, ubuf, bufflen, GFP_KERNEL);
+		if (ret)
+			goto err_ppa;
+		bio = rq->bio;
+
+		if (meta_buf && meta_len) {
+			metadata = dma_pool_alloc(dev->dma_pool, GFP_KERNEL,
+								&metadata_dma);
+			if (!metadata) {
+				ret = -ENOMEM;
+				goto err_map;
+			}
+
+			if (write) {
+				if (copy_from_user(metadata,
+						(void __user *)meta_buf,
+						meta_len)) {
+					ret = -EFAULT;
+					goto err_meta;
+				}
+			}
+			vcmd->ph_rw.metadata = cpu_to_le64(metadata_dma);
+		}
+
+		bio->bi_disk = disk;
+	}
+
+	blk_execute_rq(q, NULL, rq, 0);
+
+	if (nvme_req(rq)->flags & NVME_REQ_CANCELLED)
+		ret = -EINTR;
+	else if (nvme_req(rq)->status & 0x7ff)
+		ret = -EIO;
+	if (result)
+		*result = nvme_req(rq)->status & 0x7ff;
+	if (status)
+		*status = le64_to_cpu(nvme_req(rq)->result.u64);
+
+	if (metadata && !ret && !write) {
+		if (copy_to_user(meta_buf, (void *)metadata, meta_len))
+			ret = -EFAULT;
+	}
+err_meta:
+	if (meta_buf && meta_len)
+		dma_pool_free(dev->dma_pool, metadata, metadata_dma);
+err_map:
+	if (bio)
+		blk_rq_unmap_user(bio);
+err_ppa:
+	if (ppa_buf && ppa_len)
+		dma_pool_free(dev->dma_pool, ppa_list, ppa_dma);
+err_rq:
+	blk_mq_free_request(rq);
+err_cmd:
+	return ret;
+}
+
+static int nvme_nvm_submit_vio(struct nvme_ns *ns,
+					struct nvm_user_vio __user *uvio)
+{
+	struct nvm_user_vio vio;
+	struct nvme_nvm_command c;
+	unsigned int length;
+	int ret;
+
+	if (copy_from_user(&vio, uvio, sizeof(vio)))
+		return -EFAULT;
+	if (vio.flags)
+		return -EINVAL;
+
+	memset(&c, 0, sizeof(c));
+	c.ph_rw.opcode = vio.opcode;
+	c.ph_rw.nsid = cpu_to_le32(ns->head->ns_id);
+	c.ph_rw.control = cpu_to_le16(vio.control);
+	c.ph_rw.length = cpu_to_le16(vio.nppas);
+
+	length = (vio.nppas + 1) << ns->lba_shift;
+
+	ret = nvme_nvm_submit_user_cmd(ns->queue, ns, &c,
+			(void __user *)(uintptr_t)vio.addr, length,
+			(void __user *)(uintptr_t)vio.metadata,
+							vio.metadata_len,
+			(void __user *)(uintptr_t)vio.ppa_list, vio.nppas,
+			&vio.result, &vio.status, 0);
+
+	if (ret && copy_to_user(uvio, &vio, sizeof(vio)))
+		return -EFAULT;
+
+	return ret;
+}
+
+static int nvme_nvm_user_vcmd(struct nvme_ns *ns, int admin,
+					struct nvm_passthru_vio __user *uvcmd)
+{
+	struct nvm_passthru_vio vcmd;
+	struct nvme_nvm_command c;
+	struct request_queue *q;
+	unsigned int timeout = 0;
+	int ret;
+
+	if (copy_from_user(&vcmd, uvcmd, sizeof(vcmd)))
+		return -EFAULT;
+	if ((vcmd.opcode != 0xF2) && (!capable(CAP_SYS_ADMIN)))
+		return -EACCES;
+	if (vcmd.flags)
+		return -EINVAL;
+
+	memset(&c, 0, sizeof(c));
+	c.common.opcode = vcmd.opcode;
+	c.common.nsid = cpu_to_le32(ns->head->ns_id);
+	c.common.cdw2[0] = cpu_to_le32(vcmd.cdw2);
+	c.common.cdw2[1] = cpu_to_le32(vcmd.cdw3);
+	/* cdw11-12 */
+	c.ph_rw.length = cpu_to_le16(vcmd.nppas);
+	c.ph_rw.control  = cpu_to_le16(vcmd.control);
+	c.common.cdw10[3] = cpu_to_le32(vcmd.cdw13);
+	c.common.cdw10[4] = cpu_to_le32(vcmd.cdw14);
+	c.common.cdw10[5] = cpu_to_le32(vcmd.cdw15);
+
+	if (vcmd.timeout_ms)
+		timeout = msecs_to_jiffies(vcmd.timeout_ms);
+
+	q = admin ? ns->ctrl->admin_q : ns->queue;
+
+	ret = nvme_nvm_submit_user_cmd(q, ns,
+			(struct nvme_nvm_command *)&c,
+			(void __user *)(uintptr_t)vcmd.addr, vcmd.data_len,
+			(void __user *)(uintptr_t)vcmd.metadata,
+							vcmd.metadata_len,
+			(void __user *)(uintptr_t)vcmd.ppa_list, vcmd.nppas,
+			&vcmd.result, &vcmd.status, timeout);
+
+	if (ret && copy_to_user(uvcmd, &vcmd, sizeof(vcmd)))
+		return -EFAULT;
+
+	return ret;
+}
+
+int nvme_nvm_ioctl(struct nvme_ns *ns, unsigned int cmd, unsigned long arg)
+{
+	switch (cmd) {
+	case NVME_NVM_IOCTL_ADMIN_VIO:
+		return nvme_nvm_user_vcmd(ns, 1, (void __user *)arg);
+	case NVME_NVM_IOCTL_IO_VIO:
+		return nvme_nvm_user_vcmd(ns, 0, (void __user *)arg);
+	case NVME_NVM_IOCTL_SUBMIT_VIO:
+		return nvme_nvm_submit_vio(ns, (void __user *)arg);
+	default:
+		return -ENOTTY;
+	}
+}
+
+void nvme_nvm_update_nvm_info(struct nvme_ns *ns)
+{
+	struct nvm_dev *ndev = ns->ndev;
+	struct nvm_geo *geo = &ndev->geo;
+
+	if (geo->version == NVM_OCSSD_SPEC_12)
+		return;
+
+	geo->csecs = 1 << ns->lba_shift;
+	geo->sos = ns->ms;
+}
+
+int nvme_nvm_register(struct nvme_ns *ns, char *disk_name, int node)
+{
+	struct request_queue *q = ns->queue;
+	struct nvm_dev *dev;
+
+	_nvme_nvm_check_size();
+
+	dev = nvm_alloc_dev(node);
+	if (!dev)
+		return -ENOMEM;
+
+	dev->q = q;
+	memcpy(dev->name, disk_name, DISK_NAME_LEN);
+	dev->ops = &nvme_nvm_dev_ops;
+	dev->private_data = ns;
+	ns->ndev = dev;
+
+	return nvm_register(dev);
+}
+
+void nvme_nvm_unregister(struct nvme_ns *ns)
+{
+	nvm_unregister(ns->ndev);
+}
+
+static ssize_t nvm_dev_attr_show(struct device *dev,
+		struct device_attribute *dattr, char *page)
+{
+	struct nvme_ns *ns = nvme_get_ns_from_dev(dev);
+	struct nvm_dev *ndev = ns->ndev;
+	struct nvm_geo *geo = &ndev->geo;
+	struct attribute *attr;
+
+	if (!ndev)
+		return 0;
+
+	attr = &dattr->attr;
+
+	if (strcmp(attr->name, "version") == 0) {
+		if (geo->major_ver_id == 1)
+			return scnprintf(page, PAGE_SIZE, "%u\n",
+						geo->major_ver_id);
+		else
+			return scnprintf(page, PAGE_SIZE, "%u.%u\n",
+						geo->major_ver_id,
+						geo->minor_ver_id);
+	} else if (strcmp(attr->name, "capabilities") == 0) {
+		return scnprintf(page, PAGE_SIZE, "%u\n", geo->cap);
+	} else if (strcmp(attr->name, "read_typ") == 0) {
+		return scnprintf(page, PAGE_SIZE, "%u\n", geo->trdt);
+	} else if (strcmp(attr->name, "read_max") == 0) {
+		return scnprintf(page, PAGE_SIZE, "%u\n", geo->trdm);
+	} else {
+		return scnprintf(page,
+				 PAGE_SIZE,
+				 "Unhandled attr(%s) in `%s`\n",
+				 attr->name, __func__);
+	}
+}
+
+static ssize_t nvm_dev_attr_show_ppaf(struct nvm_addrf_12 *ppaf, char *page)
+{
+	return scnprintf(page, PAGE_SIZE,
+		"0x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x\n",
+				ppaf->ch_offset, ppaf->ch_len,
+				ppaf->lun_offset, ppaf->lun_len,
+				ppaf->pln_offset, ppaf->pln_len,
+				ppaf->blk_offset, ppaf->blk_len,
+				ppaf->pg_offset, ppaf->pg_len,
+				ppaf->sec_offset, ppaf->sec_len);
+}
+
+static ssize_t nvm_dev_attr_show_12(struct device *dev,
+		struct device_attribute *dattr, char *page)
+{
+	struct nvme_ns *ns = nvme_get_ns_from_dev(dev);
+	struct nvm_dev *ndev = ns->ndev;
+	struct nvm_geo *geo = &ndev->geo;
+	struct attribute *attr;
+
+	if (!ndev)
+		return 0;
+
+	attr = &dattr->attr;
+
+	if (strcmp(attr->name, "vendor_opcode") == 0) {
+		return scnprintf(page, PAGE_SIZE, "%u\n", geo->vmnt);
+	} else if (strcmp(attr->name, "device_mode") == 0) {
+		return scnprintf(page, PAGE_SIZE, "%u\n", geo->dom);
+	/* kept for compatibility */
+	} else if (strcmp(attr->name, "media_manager") == 0) {
+		return scnprintf(page, PAGE_SIZE, "%s\n", "gennvm");
+	} else if (strcmp(attr->name, "ppa_format") == 0) {
+		return nvm_dev_attr_show_ppaf((void *)&geo->addrf, page);
+	} else if (strcmp(attr->name, "media_type") == 0) {	/* u8 */
+		return scnprintf(page, PAGE_SIZE, "%u\n", geo->mtype);
+	} else if (strcmp(attr->name, "flash_media_type") == 0) {
+		return scnprintf(page, PAGE_SIZE, "%u\n", geo->fmtype);
+	} else if (strcmp(attr->name, "num_channels") == 0) {
+		return scnprintf(page, PAGE_SIZE, "%u\n", geo->num_ch);
+	} else if (strcmp(attr->name, "num_luns") == 0) {
+		return scnprintf(page, PAGE_SIZE, "%u\n", geo->num_lun);
+	} else if (strcmp(attr->name, "num_planes") == 0) {
+		return scnprintf(page, PAGE_SIZE, "%u\n", geo->num_pln);
+	} else if (strcmp(attr->name, "num_blocks") == 0) {	/* u16 */
+		return scnprintf(page, PAGE_SIZE, "%u\n", geo->num_chk);
+	} else if (strcmp(attr->name, "num_pages") == 0) {
+		return scnprintf(page, PAGE_SIZE, "%u\n", geo->num_pg);
+	} else if (strcmp(attr->name, "page_size") == 0) {
+		return scnprintf(page, PAGE_SIZE, "%u\n", geo->fpg_sz);
+	} else if (strcmp(attr->name, "hw_sector_size") == 0) {
+		return scnprintf(page, PAGE_SIZE, "%u\n", geo->csecs);
+	} else if (strcmp(attr->name, "oob_sector_size") == 0) {/* u32 */
+		return scnprintf(page, PAGE_SIZE, "%u\n", geo->sos);
+	} else if (strcmp(attr->name, "prog_typ") == 0) {
+		return scnprintf(page, PAGE_SIZE, "%u\n", geo->tprt);
+	} else if (strcmp(attr->name, "prog_max") == 0) {
+		return scnprintf(page, PAGE_SIZE, "%u\n", geo->tprm);
+	} else if (strcmp(attr->name, "erase_typ") == 0) {
+		return scnprintf(page, PAGE_SIZE, "%u\n", geo->tbet);
+	} else if (strcmp(attr->name, "erase_max") == 0) {
+		return scnprintf(page, PAGE_SIZE, "%u\n", geo->tbem);
+	} else if (strcmp(attr->name, "multiplane_modes") == 0) {
+		return scnprintf(page, PAGE_SIZE, "0x%08x\n", geo->mpos);
+	} else if (strcmp(attr->name, "media_capabilities") == 0) {
+		return scnprintf(page, PAGE_SIZE, "0x%08x\n", geo->mccap);
+	} else if (strcmp(attr->name, "max_phys_secs") == 0) {
+		return scnprintf(page, PAGE_SIZE, "%u\n", NVM_MAX_VLBA);
+	} else {
+		return scnprintf(page, PAGE_SIZE,
+			"Unhandled attr(%s) in `%s`\n",
+			attr->name, __func__);
+	}
+}
+
+static ssize_t nvm_dev_attr_show_20(struct device *dev,
+		struct device_attribute *dattr, char *page)
+{
+	struct nvme_ns *ns = nvme_get_ns_from_dev(dev);
+	struct nvm_dev *ndev = ns->ndev;
+	struct nvm_geo *geo = &ndev->geo;
+	struct attribute *attr;
+
+	if (!ndev)
+		return 0;
+
+	attr = &dattr->attr;
+
+	if (strcmp(attr->name, "groups") == 0) {
+		return scnprintf(page, PAGE_SIZE, "%u\n", geo->num_ch);
+	} else if (strcmp(attr->name, "punits") == 0) {
+		return scnprintf(page, PAGE_SIZE, "%u\n", geo->num_lun);
+	} else if (strcmp(attr->name, "chunks") == 0) {
+		return scnprintf(page, PAGE_SIZE, "%u\n", geo->num_chk);
+	} else if (strcmp(attr->name, "clba") == 0) {
+		return scnprintf(page, PAGE_SIZE, "%u\n", geo->clba);
+	} else if (strcmp(attr->name, "ws_min") == 0) {
+		return scnprintf(page, PAGE_SIZE, "%u\n", geo->ws_min);
+	} else if (strcmp(attr->name, "ws_opt") == 0) {
+		return scnprintf(page, PAGE_SIZE, "%u\n", geo->ws_opt);
+	} else if (strcmp(attr->name, "maxoc") == 0) {
+		return scnprintf(page, PAGE_SIZE, "%u\n", geo->maxoc);
+	} else if (strcmp(attr->name, "maxocpu") == 0) {
+		return scnprintf(page, PAGE_SIZE, "%u\n", geo->maxocpu);
+	} else if (strcmp(attr->name, "mw_cunits") == 0) {
+		return scnprintf(page, PAGE_SIZE, "%u\n", geo->mw_cunits);
+	} else if (strcmp(attr->name, "write_typ") == 0) {
+		return scnprintf(page, PAGE_SIZE, "%u\n", geo->tprt);
+	} else if (strcmp(attr->name, "write_max") == 0) {
+		return scnprintf(page, PAGE_SIZE, "%u\n", geo->tprm);
+	} else if (strcmp(attr->name, "reset_typ") == 0) {
+		return scnprintf(page, PAGE_SIZE, "%u\n", geo->tbet);
+	} else if (strcmp(attr->name, "reset_max") == 0) {
+		return scnprintf(page, PAGE_SIZE, "%u\n", geo->tbem);
+	} else {
+		return scnprintf(page, PAGE_SIZE,
+			"Unhandled attr(%s) in `%s`\n",
+			attr->name, __func__);
+	}
+}
+
+#define NVM_DEV_ATTR_RO(_name)					\
+	DEVICE_ATTR(_name, S_IRUGO, nvm_dev_attr_show, NULL)
+#define NVM_DEV_ATTR_12_RO(_name)					\
+	DEVICE_ATTR(_name, S_IRUGO, nvm_dev_attr_show_12, NULL)
+#define NVM_DEV_ATTR_20_RO(_name)					\
+	DEVICE_ATTR(_name, S_IRUGO, nvm_dev_attr_show_20, NULL)
+
+/* general attributes */
+static NVM_DEV_ATTR_RO(version);
+static NVM_DEV_ATTR_RO(capabilities);
+
+static NVM_DEV_ATTR_RO(read_typ);
+static NVM_DEV_ATTR_RO(read_max);
+
+/* 1.2 values */
+static NVM_DEV_ATTR_12_RO(vendor_opcode);
+static NVM_DEV_ATTR_12_RO(device_mode);
+static NVM_DEV_ATTR_12_RO(ppa_format);
+static NVM_DEV_ATTR_12_RO(media_manager);
+static NVM_DEV_ATTR_12_RO(media_type);
+static NVM_DEV_ATTR_12_RO(flash_media_type);
+static NVM_DEV_ATTR_12_RO(num_channels);
+static NVM_DEV_ATTR_12_RO(num_luns);
+static NVM_DEV_ATTR_12_RO(num_planes);
+static NVM_DEV_ATTR_12_RO(num_blocks);
+static NVM_DEV_ATTR_12_RO(num_pages);
+static NVM_DEV_ATTR_12_RO(page_size);
+static NVM_DEV_ATTR_12_RO(hw_sector_size);
+static NVM_DEV_ATTR_12_RO(oob_sector_size);
+static NVM_DEV_ATTR_12_RO(prog_typ);
+static NVM_DEV_ATTR_12_RO(prog_max);
+static NVM_DEV_ATTR_12_RO(erase_typ);
+static NVM_DEV_ATTR_12_RO(erase_max);
+static NVM_DEV_ATTR_12_RO(multiplane_modes);
+static NVM_DEV_ATTR_12_RO(media_capabilities);
+static NVM_DEV_ATTR_12_RO(max_phys_secs);
+
+/* 2.0 values */
+static NVM_DEV_ATTR_20_RO(groups);
+static NVM_DEV_ATTR_20_RO(punits);
+static NVM_DEV_ATTR_20_RO(chunks);
+static NVM_DEV_ATTR_20_RO(clba);
+static NVM_DEV_ATTR_20_RO(ws_min);
+static NVM_DEV_ATTR_20_RO(ws_opt);
+static NVM_DEV_ATTR_20_RO(maxoc);
+static NVM_DEV_ATTR_20_RO(maxocpu);
+static NVM_DEV_ATTR_20_RO(mw_cunits);
+static NVM_DEV_ATTR_20_RO(write_typ);
+static NVM_DEV_ATTR_20_RO(write_max);
+static NVM_DEV_ATTR_20_RO(reset_typ);
+static NVM_DEV_ATTR_20_RO(reset_max);
+
+static struct attribute *nvm_dev_attrs[] = {
+	/* version agnostic attrs */
+	&dev_attr_version.attr,
+	&dev_attr_capabilities.attr,
+	&dev_attr_read_typ.attr,
+	&dev_attr_read_max.attr,
+
+	/* 1.2 attrs */
+	&dev_attr_vendor_opcode.attr,
+	&dev_attr_device_mode.attr,
+	&dev_attr_media_manager.attr,
+	&dev_attr_ppa_format.attr,
+	&dev_attr_media_type.attr,
+	&dev_attr_flash_media_type.attr,
+	&dev_attr_num_channels.attr,
+	&dev_attr_num_luns.attr,
+	&dev_attr_num_planes.attr,
+	&dev_attr_num_blocks.attr,
+	&dev_attr_num_pages.attr,
+	&dev_attr_page_size.attr,
+	&dev_attr_hw_sector_size.attr,
+	&dev_attr_oob_sector_size.attr,
+	&dev_attr_prog_typ.attr,
+	&dev_attr_prog_max.attr,
+	&dev_attr_erase_typ.attr,
+	&dev_attr_erase_max.attr,
+	&dev_attr_multiplane_modes.attr,
+	&dev_attr_media_capabilities.attr,
+	&dev_attr_max_phys_secs.attr,
+
+	/* 2.0 attrs */
+	&dev_attr_groups.attr,
+	&dev_attr_punits.attr,
+	&dev_attr_chunks.attr,
+	&dev_attr_clba.attr,
+	&dev_attr_ws_min.attr,
+	&dev_attr_ws_opt.attr,
+	&dev_attr_maxoc.attr,
+	&dev_attr_maxocpu.attr,
+	&dev_attr_mw_cunits.attr,
+
+	&dev_attr_write_typ.attr,
+	&dev_attr_write_max.attr,
+	&dev_attr_reset_typ.attr,
+	&dev_attr_reset_max.attr,
+
+	NULL,
+};
+
+static umode_t nvm_dev_attrs_visible(struct kobject *kobj,
+				     struct attribute *attr, int index)
+{
+	struct device *dev = container_of(kobj, struct device, kobj);
+	struct gendisk *disk = dev_to_disk(dev);
+	struct nvme_ns *ns = disk->private_data;
+	struct nvm_dev *ndev = ns->ndev;
+	struct device_attribute *dev_attr =
+		container_of(attr, typeof(*dev_attr), attr);
+
+	if (!ndev)
+		return 0;
+
+	if (dev_attr->show == nvm_dev_attr_show)
+		return attr->mode;
+
+	switch (ndev->geo.major_ver_id) {
+	case 1:
+		if (dev_attr->show == nvm_dev_attr_show_12)
+			return attr->mode;
+		break;
+	case 2:
+		if (dev_attr->show == nvm_dev_attr_show_20)
+			return attr->mode;
+		break;
+	}
+
+	return 0;
+}
+
+const struct attribute_group nvme_nvm_attr_group = {
+	.name		= "lightnvm",
+	.attrs		= nvm_dev_attrs,
+	.is_visible	= nvm_dev_attrs_visible,
+};