> On 1 Mar 2018, at 11.40, Matias Bjørling <mb@xxxxxxxxxxx> wrote:
>
> On 02/28/2018 04:49 PM, Javier González wrote:
>> The 2.0 spec provides a report chunk log page that can be retrieved
>> using the stangard nvme get log page. This replaces the dedicated
>> get/put bad block table in 1.2.
>> This patch implements the helper functions to allow targets retrieve the
>> chunk metadata using get log page. It makes nvme_get_log_ext available
>> outside of nvme core so that we can use it form lightnvm.
>> Signed-off-by: Javier González <javier@xxxxxxxxxxxx>
>> ---
>> drivers/lightnvm/core.c | 11 +++++++
>> drivers/nvme/host/core.c | 6 ++--
>> drivers/nvme/host/lightnvm.c | 74 ++++++++++++++++++++++++++++++++++++++++++++
>> drivers/nvme/host/nvme.h | 3 ++
>> include/linux/lightnvm.h | 24 ++++++++++++++
>> 5 files changed, 115 insertions(+), 3 deletions(-)
>> diff --git a/drivers/lightnvm/core.c b/drivers/lightnvm/core.c
>> index ed33e0b11788..4141871f460d 100644
>> --- a/drivers/lightnvm/core.c
>> +++ b/drivers/lightnvm/core.c
>> @@ -712,6 +712,17 @@ static void nvm_free_rqd_ppalist(struct nvm_tgt_dev *tgt_dev,
>> nvm_dev_dma_free(tgt_dev->parent, rqd->ppa_list, rqd->dma_ppa_list);
>> }
>> +int nvm_get_chunk_meta(struct nvm_tgt_dev *tgt_dev, struct nvm_chk_meta *meta,
>> + struct ppa_addr ppa, int nchks)
>> +{
>> + struct nvm_dev *dev = tgt_dev->parent;
>> +
>> + nvm_ppa_tgt_to_dev(tgt_dev, &ppa, 1);
>> +
>> + return dev->ops->get_chk_meta(tgt_dev->parent, meta,
>> + (sector_t)ppa.ppa, nchks);
>> +}
>> +EXPORT_SYMBOL(nvm_get_chunk_meta);
>> int nvm_set_tgt_bb_tbl(struct nvm_tgt_dev *tgt_dev, struct ppa_addr *ppas,
>> int nr_ppas, int type)
>> diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
>> index 2e9e9f973a75..af642ce6ba69 100644
>> --- a/drivers/nvme/host/core.c
>> +++ b/drivers/nvme/host/core.c
>> @@ -2127,9 +2127,9 @@ static int nvme_init_subsystem(struct nvme_ctrl *ctrl, struct nvme_id_ctrl *id)
>> return ret;
>> }
>> -static int nvme_get_log_ext(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
>> - u8 log_page, void *log,
>> - size_t size, size_t offset)
>> +int nvme_get_log_ext(struct nvme_ctrl *ctrl, struct nvme_ns *ns,
>> + u8 log_page, void *log,
>> + size_t size, size_t offset)
>> {
>> struct nvme_command c = { };
>> unsigned long dwlen = size / 4 - 1;
>> diff --git a/drivers/nvme/host/lightnvm.c b/drivers/nvme/host/lightnvm.c
>> index f7135659f918..a1796241040f 100644
>> --- a/drivers/nvme/host/lightnvm.c
>> +++ b/drivers/nvme/host/lightnvm.c
>> @@ -35,6 +35,10 @@ enum nvme_nvm_admin_opcode {
>> 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;
>> @@ -236,6 +240,16 @@ struct nvme_nvm_id20 {
>> __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
>> */
>> @@ -252,6 +266,9 @@ static inline void _nvme_nvm_check_size(void)
>> 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_addr_format_12 *dst,
>> @@ -555,6 +572,61 @@ static int nvme_nvm_set_bb_tbl(struct nvm_dev *nvmdev, struct ppa_addr *ppas,
>> 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;
>> +
>> + /* 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;
>
> Why is this done?
The log page does not map to the lba space. You need to convert it to
get one chunk at a time in the format.
GRP:PU:CHK
I can see why taking a lba as argument is better than a ppa, since users
might use the lbas directly, but the conversion needs to be done
somewhere.
Javier
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