diff options
Diffstat (limited to 'drivers/s390/block/dasd_eckd.c')
| -rw-r--r-- | drivers/s390/block/dasd_eckd.c | 47 |
1 files changed, 33 insertions, 14 deletions
diff --git a/drivers/s390/block/dasd_eckd.c b/drivers/s390/block/dasd_eckd.c index 21164a48317d..3edb35359843 100644 --- a/drivers/s390/block/dasd_eckd.c +++ b/drivers/s390/block/dasd_eckd.c @@ -6349,6 +6349,38 @@ static void dasd_eckd_handle_hpf_error(struct dasd_device *device, dasd_schedule_requeue(device); } +/* + * Initialize block layer request queue. + */ +static void dasd_eckd_setup_blk_queue(struct dasd_block *block) +{ + unsigned int logical_block_size = block->bp_block; + struct request_queue *q = block->request_queue; + struct dasd_device *device = block->base; + int max; + + if (device->features & DASD_FEATURE_USERAW) { + /* + * the max_blocks value for raw_track access is 256 + * it is higher than the native ECKD value because we + * only need one ccw per track + * so the max_hw_sectors are + * 2048 x 512B = 1024kB = 16 tracks + */ + max = DASD_ECKD_MAX_BLOCKS_RAW << block->s2b_shift; + } else { + max = DASD_ECKD_MAX_BLOCKS << block->s2b_shift; + } + blk_queue_flag_set(QUEUE_FLAG_NONROT, q); + q->limits.max_dev_sectors = max; + blk_queue_logical_block_size(q, logical_block_size); + blk_queue_max_hw_sectors(q, max); + blk_queue_max_segments(q, USHRT_MAX); + /* With page sized segments each segment can be translated into one idaw/tidaw */ + blk_queue_max_segment_size(q, PAGE_SIZE); + blk_queue_segment_boundary(q, PAGE_SIZE - 1); +} + static struct ccw_driver dasd_eckd_driver = { .driver = { .name = "dasd-eckd", @@ -6369,24 +6401,10 @@ static struct ccw_driver dasd_eckd_driver = { .int_class = IRQIO_DAS, }; -/* - * max_blocks is dependent on the amount of storage that is available - * in the static io buffer for each device. Currently each device has - * 8192 bytes (=2 pages). For 64 bit one dasd_mchunkt_t structure has - * 24 bytes, the struct dasd_ccw_req has 136 bytes and each block can use - * up to 16 bytes (8 for the ccw and 8 for the idal pointer). In - * addition we have one define extent ccw + 16 bytes of data and one - * locate record ccw + 16 bytes of data. That makes: - * (8192 - 24 - 136 - 8 - 16 - 8 - 16) / 16 = 499 blocks at maximum. - * We want to fit two into the available memory so that we can immediately - * start the next request if one finishes off. That makes 249.5 blocks - * for one request. Give a little safety and the result is 240. - */ static struct dasd_discipline dasd_eckd_discipline = { .owner = THIS_MODULE, .name = "ECKD", .ebcname = "ECKD", - .max_blocks = 190, .check_device = dasd_eckd_check_characteristics, .uncheck_device = dasd_eckd_uncheck_device, .do_analysis = dasd_eckd_do_analysis, @@ -6394,6 +6412,7 @@ static struct dasd_discipline dasd_eckd_discipline = { .basic_to_ready = dasd_eckd_basic_to_ready, .online_to_ready = dasd_eckd_online_to_ready, .basic_to_known = dasd_eckd_basic_to_known, + .setup_blk_queue = dasd_eckd_setup_blk_queue, .fill_geometry = dasd_eckd_fill_geometry, .start_IO = dasd_start_IO, .term_IO = dasd_term_IO, |