Messages in this thread Patch in this message | | | Date | Tue, 05 May 2015 20:51:03 +0200 | From | Matias Bjorling <> | Subject | Re: [PATCH v3 7/7] nvme: LightNVM support |
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> --- a/drivers/block/nvme-core.c > +++ b/drivers/block/nvme-core.c > @@ -39,6 +39,7 @@ > #include <linux/slab.h> > #include <linux/t10-pi.h> > #include <linux/types.h> > +#include <linux/lightnvm.h> > #include <scsi/sg.h> > #include <asm-generic/io-64-nonatomic-lo-hi.h> > > @@ -134,6 +135,11 @@ static inline void _nvme_check_size(void) > BUILD_BUG_ON(sizeof(struct nvme_id_ns) != 4096); > BUILD_BUG_ON(sizeof(struct nvme_lba_range_type) != 64); > BUILD_BUG_ON(sizeof(struct nvme_smart_log) != 512); > + BUILD_BUG_ON(sizeof(struct nvme_nvm_hb_rw) != 64); > + BUILD_BUG_ON(sizeof(struct nvme_nvm_l2ptbl) != 64); > + BUILD_BUG_ON(sizeof(struct nvme_nvm_bbtbl) != 64); > + BUILD_BUG_ON(sizeof(struct nvme_nvm_set_resp) != 64); > + BUILD_BUG_ON(sizeof(struct nvme_nvm_erase_blk) != 64); > }
Keith, should I move the lightnvm definition into the nvme-lightnvm.c file as well?
> static int nvme_submit_iod(struct nvme_queue *nvmeq, struct nvme_iod *iod, > struct nvme_ns *ns) > { > @@ -888,12 +937,29 @@ static int nvme_queue_rq(struct blk_mq_hw_ctx *hctx, > } > } > > + if (ns->type == NVME_NS_NVM) { > + switch (nvm_prep_rq(req, &iod->nvm_rqdata)) { > + case NVM_PREP_DONE: > + goto done_cmd; > + case NVM_PREP_REQUEUE: > + blk_mq_requeue_request(req); > + blk_mq_kick_requeue_list(hctx->queue); > + goto done_cmd; > + case NVM_PREP_BUSY: > + goto retry_cmd; > + case NVM_PREP_ERROR: > + goto error_cmd; > + } > + } > +
Regarding the prep part. I'm not 100% satisfied with it. I can refactor it into a function and clean it up. There is still a need for the jumping, as it depends on the iod.
Another possibility is to only call it on lightnvm capable controllers. With its own queue_rq function. It would be global for all namespaces. The flow would then look like
register -> nvme_nvm_queue_rq
nvme_nvm_queue_rq() if (ns is normal command set) return nvme_queue_rq();
__nvme_nvm_queue_rq()
Any thoughts?
> index aef9a81..5292906 100644 > --- a/include/uapi/linux/nvme.h > +++ b/include/uapi/linux/nvme.h > @@ -85,6 +85,35 @@ struct nvme_id_ctrl { > __u8 vs[1024]; > }; > > +struct nvme_nvm_id_chnl { > + __le64 laddr_begin; > + __le64 laddr_end; > + __le32 oob_size; > + __le32 queue_size; > + __le32 gran_read; > + __le32 gran_write; > + __le32 gran_erase; > + __le32 t_r; > + __le32 t_sqr; > + __le32 t_w; > + __le32 t_sqw; > + __le32 t_e; > + __le16 chnl_parallelism; > + __u8 io_sched; > + __u8 reserved[133]; > +} __attribute__((packed)); > + > +struct nvme_nvm_id { > + __u8 ver_id; > + __u8 nvm_type; > + __le16 nchannels; > + __u8 reserved[252]; > + struct nvme_nvm_id_chnl chnls[]; > +} __attribute__((packed)); > + > +#define NVME_NVM_CHNLS_PR_REQ ((4096U - sizeof(struct nvme_nvm_id)) \ > + / sizeof(struct nvme_nvm_id_chnl)) > + > enum { > NVME_CTRL_ONCS_COMPARE = 1 << 0, > NVME_CTRL_ONCS_WRITE_UNCORRECTABLE = 1 << 1, > @@ -130,6 +159,7 @@ struct nvme_id_ns { > > enum { > NVME_NS_FEAT_THIN = 1 << 0, > + NVME_NS_FEAT_NVM = 1 << 3, > NVME_NS_FLBAS_LBA_MASK = 0xf, > NVME_NS_FLBAS_META_EXT = 0x10, > NVME_LBAF_RP_BEST = 0, > @@ -146,6 +176,8 @@ enum { > NVME_NS_DPS_PI_TYPE1 = 1, > NVME_NS_DPS_PI_TYPE2 = 2, > NVME_NS_DPS_PI_TYPE3 = 3, > + > + NVME_NS_NVM = 1, > }; > > struct nvme_smart_log { > @@ -229,6 +261,12 @@ enum nvme_opcode { > nvme_cmd_resv_report = 0x0e, > nvme_cmd_resv_acquire = 0x11, > nvme_cmd_resv_release = 0x15, > + > + nvme_nvm_cmd_hb_write = 0x81, > + nvme_nvm_cmd_hb_read = 0x02, > + nvme_nvm_cmd_phys_write = 0x91, > + nvme_nvm_cmd_phys_read = 0x92, > + nvme_nvm_cmd_erase = 0x90, > }; > > struct nvme_common_command { > @@ -261,6 +299,74 @@ struct nvme_rw_command { > __le16 appmask; > }; > > +struct nvme_nvm_hb_rw { > + __u8 opcode; > + __u8 flags; > + __u16 command_id; > + __le32 nsid; > + __u64 rsvd2; > + __le64 metadata; > + __le64 prp1; > + __le64 prp2; > + __le64 slba; > + __le16 length; > + __le16 control; > + __le32 dsmgmt; > + __le64 phys_addr; > +}; > + > +struct nvme_nvm_l2ptbl { > + __u8 opcode; > + __u8 flags; > + __u16 command_id; > + __le32 nsid; > + __le32 cdw2[4]; > + __le64 prp1; > + __le64 prp2; > + __le64 slba; > + __le32 nlb; > + __u16 prp1_len; > + __le16 cdw14[5]; > +}; > + > +struct nvme_nvm_bbtbl { > + __u8 opcode; > + __u8 flags; > + __u16 command_id; > + __le32 nsid; > + __u64 rsvd[2]; > + __le64 prp1; > + __le64 prp2; > + __le32 prp1_len; > + __le32 prp2_len; > + __le32 lbb; > + __u32 rsvd11[3]; > +}; > + > +struct nvme_nvm_set_resp { > + __u8 opcode; > + __u8 flags; > + __u16 command_id; > + __le32 nsid; > + __u64 rsvd[2]; > + __le64 prp1; > + __le64 prp2; > + __le64 resp; > + __u32 rsvd11[4]; > +}; > + > +struct nvme_nvm_erase_blk { > + __u8 opcode; > + __u8 flags; > + __u16 command_id; > + __le32 nsid; > + __u64 rsvd[2]; > + __le64 prp1; > + __le64 prp2; > + __le64 blk_addr; > + __u32 rsvd11[4]; > +}; > + > enum { > NVME_RW_LR = 1 << 15, > NVME_RW_FUA = 1 << 14, > @@ -328,6 +434,13 @@ enum nvme_admin_opcode { > nvme_admin_format_nvm = 0x80, > nvme_admin_security_send = 0x81, > nvme_admin_security_recv = 0x82, > + > + nvme_nvm_admin_identify = 0xe2, > + nvme_nvm_admin_get_features = 0xe6, > + nvme_nvm_admin_set_resp = 0xe5, > + nvme_nvm_admin_get_l2p_tbl = 0xea, > + nvme_nvm_admin_get_bb_tbl = 0xf2, > + nvme_nvm_admin_set_bb_tbl = 0xf1, > }; > > enum { > @@ -457,6 +570,18 @@ struct nvme_format_cmd { > __u32 rsvd11[5]; > }; > > +struct nvme_nvm_identify { > + __u8 opcode; > + __u8 flags; > + __u16 command_id; > + __le32 nsid; > + __u64 rsvd[2]; > + __le64 prp1; > + __le64 prp2; > + __le32 cns; > + __u32 rsvd11[5]; > +}; > + > struct nvme_command { > union { > struct nvme_common_command common; > @@ -470,6 +595,13 @@ struct nvme_command { > struct nvme_format_cmd format; > struct nvme_dsm_cmd dsm; > struct nvme_abort_cmd abort; > + struct nvme_nvm_identify nvm_identify; > + struct nvme_nvm_hb_rw nvm_hb_rw; > + struct nvme_nvm_l2ptbl nvm_l2p; > + struct nvme_nvm_bbtbl nvm_get_bb; > + struct nvme_nvm_bbtbl nvm_set_bb; > + struct nvme_nvm_set_resp nvm_resp; > + struct nvme_nvm_erase_blk nvm_erase; > }; > }; >
All these could be moved into the nvme-lightnvm.c file. Taking the previous discussion with Christoph regarding exposing user headers with the protocol. It maybe shouldn't be exposed.
Should I push it into nvme-lightnvm.h? (there is still a need for struct nvme_nvm_hb_rw. The other defs can be moved)
Anything else?
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