Date: Fri, 12 Jul 2013 00:50:25 +0000 (UTC) From: Scott Long <scottl@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: svn commit: r253228 - head/sys/cam/scsi Message-ID: <201307120050.r6C0oPpU085879@svn.freebsd.org>
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Author: scottl Date: Fri Jul 12 00:50:25 2013 New Revision: 253228 URL: http://svnweb.freebsd.org/changeset/base/253228 Log: Refactor the various delete methods out of dastart(). Cleans up a bunch of style and adds more modularity and clarity. Obtained from: Netflix MFC after: 3 days Modified: head/sys/cam/scsi/scsi_da.c Modified: head/sys/cam/scsi/scsi_da.c ============================================================================== --- head/sys/cam/scsi/scsi_da.c Fri Jul 12 00:40:49 2013 (r253227) +++ head/sys/cam/scsi/scsi_da.c Fri Jul 12 00:50:25 2013 (r253228) @@ -144,6 +144,22 @@ typedef enum { DA_DELETE_MAX = DA_DELETE_ZERO } da_delete_methods; +typedef void da_delete_func_t (struct cam_periph *periph, union ccb *ccb, + struct bio *bp); +static da_delete_func_t da_delete_trim; +static da_delete_func_t da_delete_unmap; +static da_delete_func_t da_delete_ws; + +static void * da_delete_functions[] = { + NULL, + NULL, + da_delete_trim, + da_delete_unmap, + da_delete_ws, + da_delete_ws, + da_delete_ws +}; + static const char *da_delete_method_names[] = { "NONE", "DISABLE", "ATA_TRIM", "UNMAP", "WS16", "WS10", "ZERO" }; static const char *da_delete_method_desc[] = @@ -198,6 +214,7 @@ struct da_softc { uint32_t unmap_max_lba; uint64_t ws_max_blks; da_delete_methods delete_method; + da_delete_func_t *delete_func; struct disk_params params; struct disk *disk; union ccb saved_ccb; @@ -1801,6 +1818,10 @@ dadeletemethodset(struct da_softc *softc softc->delete_method = delete_method; softc->disk->d_delmaxsize = dadeletemaxsize(softc, delete_method); + if (delete_method <= DA_DELETE_MAX) + softc->delete_func = da_delete_functions[delete_method]; + else + softc->delete_func = NULL; if (softc->delete_method > DA_DELETE_DISABLE) softc->disk->d_flags |= DISKFLAG_CANDELETE; @@ -2160,7 +2181,7 @@ skipstate: switch (softc->state) { case DA_STATE_NORMAL: { - struct bio *bp, *bp1; + struct bio *bp; uint8_t tag_code; /* Execute immediate CCB if waiting. */ @@ -2180,237 +2201,13 @@ skipstate: /* Run BIO_DELETE if not running yet. */ if (!softc->delete_running && (bp = bioq_first(&softc->delete_queue)) != NULL) { - uint64_t lba; - uint64_t count; /* forward compat with WS32 */ - - /* - * In each of the methods below, while its the caller's - * responsibility to ensure the request will fit into a - * single device request, we might have changed the delete - * method due to the device incorrectly advertising either - * its supported methods or limits. - * - * To prevent this causing further issues we validate the - * against the methods limits, and warn which would - * otherwise be unnecessary. - */ - - if (softc->delete_method == DA_DELETE_UNMAP) { - uint8_t *buf = softc->unmap_buf; - uint64_t lastlba = (uint64_t)-1; - uint32_t lastcount = 0, c; - uint64_t totalcount = 0; - uint32_t off, ranges = 0; - - /* - * Currently this doesn't take the UNMAP - * Granularity and Granularity Alignment - * fields into account. - * - * This could result in both unoptimal unmap - * requests as as well as UNMAP calls unmapping - * fewer LBA's than requested. - */ - - softc->delete_running = 1; - bzero(softc->unmap_buf, sizeof(softc->unmap_buf)); - bp1 = bp; - do { - bioq_remove(&softc->delete_queue, bp1); - if (bp1 != bp) - bioq_insert_tail(&softc->delete_run_queue, bp1); - lba = bp1->bio_pblkno; - count = bp1->bio_bcount / softc->params.secsize; - - /* Try to extend the previous range. */ - if (lba == lastlba) { - c = min(count, softc->unmap_max_lba - - lastcount); - lastcount += c; - off = ((ranges - 1) * UNMAP_RANGE_SIZE) + - UNMAP_HEAD_SIZE; - scsi_ulto4b(lastcount, &buf[off + 8]); - count -= c; - lba +=c; - totalcount += c; - } - - while (count > 0) { - c = min(count, softc->unmap_max_lba); - if (totalcount + c > softc->unmap_max_lba || - ranges >= softc->unmap_max_ranges) { - xpt_print(periph->path, - "%s issuing short delete %ld > %ld" - "|| %d >= %d", - da_delete_method_desc[softc->delete_method], - totalcount + c, softc->unmap_max_lba, - ranges, softc->unmap_max_ranges); - break; - } - off = (ranges * UNMAP_RANGE_SIZE) + - UNMAP_HEAD_SIZE; - scsi_u64to8b(lba, &buf[off + 0]); - scsi_ulto4b(c, &buf[off + 8]); - lba += c; - totalcount += c; - ranges++; - count -= c; - lastcount = c; - } - lastlba = lba; - bp1 = bioq_first(&softc->delete_queue); - if (bp1 == NULL || - ranges >= softc->unmap_max_ranges || - totalcount + bp1->bio_bcount / - softc->params.secsize > softc->unmap_max_lba) - break; - } while (1); - scsi_ulto2b(ranges * 16 + 6, &buf[0]); - scsi_ulto2b(ranges * 16, &buf[2]); - - scsi_unmap(&start_ccb->csio, - /*retries*/da_retry_count, - /*cbfcnp*/dadone, - /*tag_action*/MSG_SIMPLE_Q_TAG, - /*byte2*/0, - /*data_ptr*/ buf, - /*dxfer_len*/ ranges * 16 + 8, - /*sense_len*/SSD_FULL_SIZE, - da_default_timeout * 1000); - start_ccb->ccb_h.ccb_state = DA_CCB_DELETE; - goto out; - } else if (softc->delete_method == DA_DELETE_ATA_TRIM) { - uint8_t *buf = softc->unmap_buf; - uint64_t lastlba = (uint64_t)-1; - uint32_t lastcount = 0, c, requestcount; - int ranges = 0, off, block_count; - - softc->delete_running = 1; - bzero(softc->unmap_buf, sizeof(softc->unmap_buf)); - bp1 = bp; - do { - bioq_remove(&softc->delete_queue, bp1); - if (bp1 != bp) - bioq_insert_tail(&softc->delete_run_queue, bp1); - lba = bp1->bio_pblkno; - count = bp1->bio_bcount / softc->params.secsize; - requestcount = count; - - /* Try to extend the previous range. */ - if (lba == lastlba) { - c = min(count, ATA_DSM_RANGE_MAX - lastcount); - lastcount += c; - off = (ranges - 1) * 8; - buf[off + 6] = lastcount & 0xff; - buf[off + 7] = (lastcount >> 8) & 0xff; - count -= c; - lba += c; - } - - while (count > 0) { - c = min(count, ATA_DSM_RANGE_MAX); - off = ranges * 8; - - buf[off + 0] = lba & 0xff; - buf[off + 1] = (lba >> 8) & 0xff; - buf[off + 2] = (lba >> 16) & 0xff; - buf[off + 3] = (lba >> 24) & 0xff; - buf[off + 4] = (lba >> 32) & 0xff; - buf[off + 5] = (lba >> 40) & 0xff; - buf[off + 6] = c & 0xff; - buf[off + 7] = (c >> 8) & 0xff; - lba += c; - ranges++; - count -= c; - lastcount = c; - if (count != 0 && ranges == softc->trim_max_ranges) { - xpt_print(periph->path, - "%s issuing short delete %ld > %ld", - da_delete_method_desc[softc->delete_method], - requestcount, - (softc->trim_max_ranges - ranges) * - ATA_DSM_RANGE_MAX); - break; - } - } - lastlba = lba; - bp1 = bioq_first(&softc->delete_queue); - if (bp1 == NULL || - bp1->bio_bcount / softc->params.secsize > - (softc->trim_max_ranges - ranges) * - ATA_DSM_RANGE_MAX) - break; - } while (1); - - block_count = (ranges + ATA_DSM_BLK_RANGES - 1) / - ATA_DSM_BLK_RANGES; - scsi_ata_trim(&start_ccb->csio, - /*retries*/da_retry_count, - /*cbfcnp*/dadone, - /*tag_action*/MSG_SIMPLE_Q_TAG, - block_count, - /*data_ptr*/buf, - /*dxfer_len*/block_count * ATA_DSM_BLK_SIZE, - /*sense_len*/SSD_FULL_SIZE, - da_default_timeout * 1000); - start_ccb->ccb_h.ccb_state = DA_CCB_DELETE; + if (softc->delete_func != NULL) { + softc->delete_func(periph, start_ccb, bp); goto out; - } else if (softc->delete_method == DA_DELETE_ZERO || - softc->delete_method == DA_DELETE_WS10 || - softc->delete_method == DA_DELETE_WS16) { - /* - * We calculate ws_max_blks here based off d_delmaxsize instead - * of using softc->ws_max_blks as it is absolute max for the - * device not the protocol max which may well be lower - */ - uint64_t ws_max_blks; - ws_max_blks = softc->disk->d_delmaxsize / softc->params.secsize; - softc->delete_running = 1; - lba = bp->bio_pblkno; - count = 0; - bp1 = bp; - do { - bioq_remove(&softc->delete_queue, bp1); - if (bp1 != bp) - bioq_insert_tail(&softc->delete_run_queue, bp1); - count += bp1->bio_bcount / softc->params.secsize; - if (count > ws_max_blks) { - count = min(count, ws_max_blks); - xpt_print(periph->path, - "%s issuing short delete %ld > %ld", - da_delete_method_desc[softc->delete_method], - count, ws_max_blks); - break; - } - bp1 = bioq_first(&softc->delete_queue); - if (bp1 == NULL || - lba + count != bp1->bio_pblkno || - count + bp1->bio_bcount / - softc->params.secsize > ws_max_blks) - break; - } while (1); - - scsi_write_same(&start_ccb->csio, - /*retries*/da_retry_count, - /*cbfcnp*/dadone, - /*tag_action*/MSG_SIMPLE_Q_TAG, - /*byte2*/softc->delete_method == - DA_DELETE_ZERO ? 0 : SWS_UNMAP, - softc->delete_method == - DA_DELETE_WS16 ? 16 : 10, - /*lba*/lba, - /*block_count*/count, - /*data_ptr*/ __DECONST(void *, - zero_region), - /*dxfer_len*/ softc->params.secsize, - /*sense_len*/SSD_FULL_SIZE, - da_default_timeout * 1000); - start_ccb->ccb_h.ccb_state = DA_CCB_DELETE; - goto out; - } else { - bioq_flush(&softc->delete_queue, NULL, 0); - /* FALLTHROUGH */ - } + } else { + bioq_flush(&softc->delete_queue, NULL, 0); + /* FALLTHROUGH */ + } } /* Run regular command. */ @@ -2703,6 +2500,240 @@ out: } } +/* + * In each of the methods below, while its the caller's + * responsibility to ensure the request will fit into a + * single device request, we might have changed the delete + * method due to the device incorrectly advertising either + * its supported methods or limits. + * + * To prevent this causing further issues we validate the + * against the methods limits, and warn which would + * otherwise be unnecessary. + */ +static void +da_delete_unmap(struct cam_periph *periph, union ccb *ccb, struct bio *bp) +{ + struct da_softc *softc = (struct da_softc *)periph->softc;; + struct bio *bp1; + uint8_t *buf = softc->unmap_buf; + uint64_t lba, lastlba = (uint64_t)-1; + uint64_t totalcount = 0; + uint64_t count; + uint32_t lastcount = 0, c; + uint32_t off, ranges = 0; + + /* + * Currently this doesn't take the UNMAP + * Granularity and Granularity Alignment + * fields into account. + * + * This could result in both unoptimal unmap + * requests as as well as UNMAP calls unmapping + * fewer LBA's than requested. + */ + + softc->delete_running = 1; + bzero(softc->unmap_buf, sizeof(softc->unmap_buf)); + bp1 = bp; + do { + bioq_remove(&softc->delete_queue, bp1); + if (bp1 != bp) + bioq_insert_tail(&softc->delete_run_queue, bp1); + lba = bp1->bio_pblkno; + count = bp1->bio_bcount / softc->params.secsize; + + /* Try to extend the previous range. */ + if (lba == lastlba) { + c = min(count, softc->unmap_max_lba - lastcount); + lastcount += c; + off = ((ranges - 1) * UNMAP_RANGE_SIZE) + + UNMAP_HEAD_SIZE; + scsi_ulto4b(lastcount, &buf[off + 8]); + count -= c; + lba +=c; + totalcount += c; + } + + while (count > 0) { + c = min(count, softc->unmap_max_lba); + if (totalcount + c > softc->unmap_max_lba || + ranges >= softc->unmap_max_ranges) { + xpt_print(periph->path, + "%s issuing short delete %ld > %ld" + "|| %d >= %d", + da_delete_method_desc[softc->delete_method], + totalcount + c, softc->unmap_max_lba, + ranges, softc->unmap_max_ranges); + break; + } + off = (ranges * UNMAP_RANGE_SIZE) + UNMAP_HEAD_SIZE; + scsi_u64to8b(lba, &buf[off + 0]); + scsi_ulto4b(c, &buf[off + 8]); + lba += c; + totalcount += c; + ranges++; + count -= c; + lastcount = c; + } + lastlba = lba; + bp1 = bioq_first(&softc->delete_queue); + if (bp1 == NULL || ranges >= softc->unmap_max_ranges || + totalcount + bp1->bio_bcount / + softc->params.secsize > softc->unmap_max_lba) + break; + } while (1); + scsi_ulto2b(ranges * 16 + 6, &buf[0]); + scsi_ulto2b(ranges * 16, &buf[2]); + + scsi_unmap(&ccb->csio, + /*retries*/da_retry_count, + /*cbfcnp*/dadone, + /*tag_action*/MSG_SIMPLE_Q_TAG, + /*byte2*/0, + /*data_ptr*/ buf, + /*dxfer_len*/ ranges * 16 + 8, + /*sense_len*/SSD_FULL_SIZE, + da_default_timeout * 1000); + ccb->ccb_h.ccb_state = DA_CCB_DELETE; +} + +static void +da_delete_trim(struct cam_periph *periph, union ccb *ccb, struct bio *bp) +{ + struct da_softc *softc = (struct da_softc *)periph->softc; + struct bio *bp1; + uint8_t *buf = softc->unmap_buf; + uint64_t lastlba = (uint64_t)-1; + uint64_t count; + uint64_t lba; + uint32_t lastcount = 0, c, requestcount; + int ranges = 0, off, block_count; + + softc->delete_running = 1; + bzero(softc->unmap_buf, sizeof(softc->unmap_buf)); + bp1 = bp; + do { + bioq_remove(&softc->delete_queue, bp1); + if (bp1 != bp) + bioq_insert_tail(&softc->delete_run_queue, bp1); + lba = bp1->bio_pblkno; + count = bp1->bio_bcount / softc->params.secsize; + requestcount = count; + + /* Try to extend the previous range. */ + if (lba == lastlba) { + c = min(count, ATA_DSM_RANGE_MAX - lastcount); + lastcount += c; + off = (ranges - 1) * 8; + buf[off + 6] = lastcount & 0xff; + buf[off + 7] = (lastcount >> 8) & 0xff; + count -= c; + lba += c; + } + + while (count > 0) { + c = min(count, ATA_DSM_RANGE_MAX); + off = ranges * 8; + + buf[off + 0] = lba & 0xff; + buf[off + 1] = (lba >> 8) & 0xff; + buf[off + 2] = (lba >> 16) & 0xff; + buf[off + 3] = (lba >> 24) & 0xff; + buf[off + 4] = (lba >> 32) & 0xff; + buf[off + 5] = (lba >> 40) & 0xff; + buf[off + 6] = c & 0xff; + buf[off + 7] = (c >> 8) & 0xff; + lba += c; + ranges++; + count -= c; + lastcount = c; + if (count != 0 && ranges == softc->trim_max_ranges) { + xpt_print(periph->path, + "%s issuing short delete %ld > %ld", + da_delete_method_desc[softc->delete_method], + requestcount, + (softc->trim_max_ranges - ranges) * + ATA_DSM_RANGE_MAX); + break; + } + } + lastlba = lba; + bp1 = bioq_first(&softc->delete_queue); + if (bp1 == NULL || bp1->bio_bcount / softc->params.secsize > + (softc->trim_max_ranges - ranges) * ATA_DSM_RANGE_MAX) + break; + } while (1); + + block_count = (ranges + ATA_DSM_BLK_RANGES - 1) / ATA_DSM_BLK_RANGES; + scsi_ata_trim(&ccb->csio, + /*retries*/da_retry_count, + /*cbfcnp*/dadone, + /*tag_action*/MSG_SIMPLE_Q_TAG, + block_count, + /*data_ptr*/buf, + /*dxfer_len*/block_count * ATA_DSM_BLK_SIZE, + /*sense_len*/SSD_FULL_SIZE, + da_default_timeout * 1000); + ccb->ccb_h.ccb_state = DA_CCB_DELETE; +} + +/* + * We calculate ws_max_blks here based off d_delmaxsize instead + * of using softc->ws_max_blks as it is absolute max for the + * device not the protocol max which may well be lower + */ +static void +da_delete_ws(struct cam_periph *periph, union ccb *ccb, struct bio *bp) +{ + struct da_softc *softc; + struct bio *bp1; + uint64_t ws_max_blks; + uint64_t lba; + uint64_t count; /* forward compat with WS32 */ + + softc = (struct da_softc *)periph->softc; + ws_max_blks = softc->disk->d_delmaxsize / softc->params.secsize; + softc->delete_running = 1; + lba = bp->bio_pblkno; + count = 0; + bp1 = bp; + do { + bioq_remove(&softc->delete_queue, bp1); + if (bp1 != bp) + bioq_insert_tail(&softc->delete_run_queue, bp1); + count += bp1->bio_bcount / softc->params.secsize; + if (count > ws_max_blks) { + count = min(count, ws_max_blks); + xpt_print(periph->path, + "%s issuing short delete %ld > %ld", + da_delete_method_desc[softc->delete_method], + count, ws_max_blks); + break; + } + bp1 = bioq_first(&softc->delete_queue); + if (bp1 == NULL || lba + count != bp1->bio_pblkno || + count + bp1->bio_bcount / + softc->params.secsize > ws_max_blks) + break; + } while (1); + + scsi_write_same(&ccb->csio, + /*retries*/da_retry_count, + /*cbfcnp*/dadone, + /*tag_action*/MSG_SIMPLE_Q_TAG, + /*byte2*/softc->delete_method == + DA_DELETE_ZERO ? 0 : SWS_UNMAP, + softc->delete_method == DA_DELETE_WS16 ? 16 : 10, + /*lba*/lba, + /*block_count*/count, + /*data_ptr*/ __DECONST(void *, zero_region), + /*dxfer_len*/ softc->params.secsize, + /*sense_len*/SSD_FULL_SIZE, + da_default_timeout * 1000); + ccb->ccb_h.ccb_state = DA_CCB_DELETE; +} + static int cmd6workaround(union ccb *ccb) {
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