diff options
| -rw-r--r-- | drivers/lightnvm/pblk-read.c | 183 | ||||
| -rw-r--r-- | drivers/lightnvm/pblk.h | 10 |
2 files changed, 130 insertions, 63 deletions
diff --git a/drivers/lightnvm/pblk-read.c b/drivers/lightnvm/pblk-read.c index 9c9362b20861..26d414ae25b6 100644 --- a/drivers/lightnvm/pblk-read.c +++ b/drivers/lightnvm/pblk-read.c @@ -231,74 +231,36 @@ static void pblk_end_io_read(struct nvm_rq *rqd) __pblk_end_io_read(pblk, rqd, true); } -static int pblk_partial_read(struct pblk *pblk, struct nvm_rq *rqd, - struct bio *orig_bio, unsigned int bio_init_idx, - unsigned long *read_bitmap) +static void pblk_end_partial_read(struct nvm_rq *rqd) { - struct pblk_sec_meta *meta_list = rqd->meta_list; - struct bio *new_bio; + struct pblk *pblk = rqd->private; + struct pblk_g_ctx *r_ctx = nvm_rq_to_pdu(rqd); + struct pblk_pr_ctx *pr_ctx = r_ctx->private; + struct bio *new_bio = rqd->bio; + struct bio *bio = pr_ctx->orig_bio; struct bio_vec src_bv, dst_bv; - void *ppa_ptr = NULL; - void *src_p, *dst_p; - dma_addr_t dma_ppa_list = 0; - __le64 *lba_list_mem, *lba_list_media; - int nr_secs = rqd->nr_ppas; + struct pblk_sec_meta *meta_list = rqd->meta_list; + int bio_init_idx = pr_ctx->bio_init_idx; + unsigned long *read_bitmap = pr_ctx->bitmap; + int nr_secs = pr_ctx->orig_nr_secs; int nr_holes = nr_secs - bitmap_weight(read_bitmap, nr_secs); - int i, ret, hole; - - /* Re-use allocated memory for intermediate lbas */ - lba_list_mem = (((void *)rqd->ppa_list) + pblk_dma_ppa_size); - lba_list_media = (((void *)rqd->ppa_list) + 2 * pblk_dma_ppa_size); - - new_bio = bio_alloc(GFP_KERNEL, nr_holes); - - if (pblk_bio_add_pages(pblk, new_bio, GFP_KERNEL, nr_holes)) - goto fail_add_pages; - - if (nr_holes != new_bio->bi_vcnt) { - pblk_err(pblk, "malformed bio\n"); - goto fail; - } - - for (i = 0; i < nr_secs; i++) - lba_list_mem[i] = meta_list[i].lba; - - new_bio->bi_iter.bi_sector = 0; /* internal bio */ - bio_set_op_attrs(new_bio, REQ_OP_READ, 0); - - rqd->bio = new_bio; - rqd->nr_ppas = nr_holes; - rqd->flags = pblk_set_read_mode(pblk, PBLK_READ_RANDOM); - - if (unlikely(nr_holes == 1)) { - ppa_ptr = rqd->ppa_list; - dma_ppa_list = rqd->dma_ppa_list; - rqd->ppa_addr = rqd->ppa_list[0]; - } - - ret = pblk_submit_io_sync(pblk, rqd); - if (ret) { - bio_put(rqd->bio); - pblk_err(pblk, "sync read IO submission failed\n"); - goto fail; - } - - if (rqd->error) { - atomic_long_inc(&pblk->read_failed); -#ifdef CONFIG_NVM_PBLK_DEBUG - pblk_print_failed_rqd(pblk, rqd, rqd->error); -#endif - } + __le64 *lba_list_mem, *lba_list_media; + void *src_p, *dst_p; + int hole, i; if (unlikely(nr_holes == 1)) { struct ppa_addr ppa; ppa = rqd->ppa_addr; - rqd->ppa_list = ppa_ptr; - rqd->dma_ppa_list = dma_ppa_list; + rqd->ppa_list = pr_ctx->ppa_ptr; + rqd->dma_ppa_list = pr_ctx->dma_ppa_list; rqd->ppa_list[0] = ppa; } + /* Re-use allocated memory for intermediate lbas */ + lba_list_mem = (((void *)rqd->ppa_list) + pblk_dma_ppa_size); + lba_list_media = (((void *)rqd->ppa_list) + 2 * pblk_dma_ppa_size); + for (i = 0; i < nr_secs; i++) { lba_list_media[i] = meta_list[i].lba; meta_list[i].lba = lba_list_mem[i]; @@ -316,7 +278,7 @@ static int pblk_partial_read(struct pblk *pblk, struct nvm_rq *rqd, meta_list[hole].lba = lba_list_media[i]; src_bv = new_bio->bi_io_vec[i++]; - dst_bv = orig_bio->bi_io_vec[bio_init_idx + hole]; + dst_bv = bio->bi_io_vec[bio_init_idx + hole]; src_p = kmap_atomic(src_bv.bv_page); dst_p = kmap_atomic(dst_bv.bv_page); @@ -334,19 +296,107 @@ static int pblk_partial_read(struct pblk *pblk, struct nvm_rq *rqd, } while (hole < nr_secs); bio_put(new_bio); + kfree(pr_ctx); /* restore original request */ rqd->bio = NULL; rqd->nr_ppas = nr_secs; + bio_endio(bio); __pblk_end_io_read(pblk, rqd, false); - return NVM_IO_DONE; +} -fail: - /* Free allocated pages in new bio */ +static int pblk_setup_partial_read(struct pblk *pblk, struct nvm_rq *rqd, + unsigned int bio_init_idx, + unsigned long *read_bitmap, + int nr_holes) +{ + struct pblk_sec_meta *meta_list = rqd->meta_list; + struct pblk_g_ctx *r_ctx = nvm_rq_to_pdu(rqd); + struct pblk_pr_ctx *pr_ctx; + struct bio *new_bio, *bio = r_ctx->private; + __le64 *lba_list_mem; + int nr_secs = rqd->nr_ppas; + int i; + + /* Re-use allocated memory for intermediate lbas */ + lba_list_mem = (((void *)rqd->ppa_list) + pblk_dma_ppa_size); + + new_bio = bio_alloc(GFP_KERNEL, nr_holes); + + if (pblk_bio_add_pages(pblk, new_bio, GFP_KERNEL, nr_holes)) + goto fail_bio_put; + + if (nr_holes != new_bio->bi_vcnt) { + WARN_ONCE(1, "pblk: malformed bio\n"); + goto fail_free_pages; + } + + pr_ctx = kmalloc(sizeof(struct pblk_pr_ctx), GFP_KERNEL); + if (!pr_ctx) + goto fail_free_pages; + + for (i = 0; i < nr_secs; i++) + lba_list_mem[i] = meta_list[i].lba; + + new_bio->bi_iter.bi_sector = 0; /* internal bio */ + bio_set_op_attrs(new_bio, REQ_OP_READ, 0); + + rqd->bio = new_bio; + rqd->nr_ppas = nr_holes; + rqd->flags = pblk_set_read_mode(pblk, PBLK_READ_RANDOM); + + pr_ctx->ppa_ptr = NULL; + pr_ctx->orig_bio = bio; + bitmap_copy(pr_ctx->bitmap, read_bitmap, NVM_MAX_VLBA); + pr_ctx->bio_init_idx = bio_init_idx; + pr_ctx->orig_nr_secs = nr_secs; + r_ctx->private = pr_ctx; + + if (unlikely(nr_holes == 1)) { + pr_ctx->ppa_ptr = rqd->ppa_list; + pr_ctx->dma_ppa_list = rqd->dma_ppa_list; + rqd->ppa_addr = rqd->ppa_list[0]; + } + return 0; + +fail_free_pages: pblk_bio_free_pages(pblk, new_bio, 0, new_bio->bi_vcnt); -fail_add_pages: +fail_bio_put: + bio_put(new_bio); + + return -ENOMEM; +} + +static int pblk_partial_read_bio(struct pblk *pblk, struct nvm_rq *rqd, + unsigned int bio_init_idx, + unsigned long *read_bitmap, int nr_secs) +{ + int nr_holes; + int ret; + + nr_holes = nr_secs - bitmap_weight(read_bitmap, nr_secs); + + if (pblk_setup_partial_read(pblk, rqd, bio_init_idx, read_bitmap, + nr_holes)) + return NVM_IO_ERR; + + rqd->end_io = pblk_end_partial_read; + + ret = pblk_submit_io(pblk, rqd); + if (ret) { + bio_put(rqd->bio); + pblk_err(pblk, "partial read IO submission failed\n"); + goto err; + } + + return NVM_IO_OK; + +err: pblk_err(pblk, "failed to perform partial read\n"); + + /* Free allocated pages in new bio */ + pblk_bio_free_pages(pblk, rqd->bio, 0, rqd->bio->bi_vcnt); __pblk_end_io_read(pblk, rqd, false); return NVM_IO_ERR; } @@ -480,8 +530,15 @@ int pblk_submit_read(struct pblk *pblk, struct bio *bio) /* The read bio request could be partially filled by the write buffer, * but there are some holes that need to be read from the drive. */ - return pblk_partial_read(pblk, rqd, bio, bio_init_idx, read_bitmap); + ret = pblk_partial_read_bio(pblk, rqd, bio_init_idx, read_bitmap, + nr_secs); + if (ret) + goto fail_meta_free; + + return NVM_IO_OK; +fail_meta_free: + nvm_dev_dma_free(dev->parent, rqd->meta_list, rqd->dma_meta_list); fail_rqd_free: pblk_free_rqd(pblk, rqd, PBLK_READ); return ret; diff --git a/drivers/lightnvm/pblk.h b/drivers/lightnvm/pblk.h index 5c6904eb8557..4760af7b6499 100644 --- a/drivers/lightnvm/pblk.h +++ b/drivers/lightnvm/pblk.h @@ -119,6 +119,16 @@ struct pblk_g_ctx { u64 lba; }; +/* partial read context */ +struct pblk_pr_ctx { + struct bio *orig_bio; + DECLARE_BITMAP(bitmap, NVM_MAX_VLBA); + unsigned int orig_nr_secs; + unsigned int bio_init_idx; + void *ppa_ptr; + dma_addr_t dma_ppa_list; +}; + /* Pad context */ struct pblk_pad_rq { struct pblk *pblk; |