* At most, there is only one ide-tape originated data transfer request
* in the device request queue. This allows ide.c to easily service
* requests from the other device when we postpone our active request.
- * In the pipelined operation mode, we use our internal pipeline
- * structure to hold more data requests. The data buffer size is chosen
- * based on the tape's recommendation.
*/
- /* ptr to the request which is waiting in the device request queue */
- struct request *active_data_rq;
+
/* Data buffer size chosen based on the tape's recommendation */
int stage_size;
idetape_stage_t *merge_stage;
char *b_data;
int b_count;
- /*
- * Pipeline parameters.
- *
- * To accomplish non-pipelined mode, we simply set the following
- * variables to zero (or NULL, where appropriate).
- */
- /* Number of currently used stages */
- int nr_stages;
- /* Number of pending stages */
- int nr_pending_stages;
- /* We will not allocate more than this number of stages */
- int max_stages, min_pipeline, max_pipeline;
- /* The first stage which will be removed from the pipeline */
- idetape_stage_t *first_stage;
- /* The currently active stage */
- idetape_stage_t *active_stage;
- /* Will be serviced after the currently active request */
- idetape_stage_t *next_stage;
- /* New requests will be added to the pipeline here */
- idetape_stage_t *last_stage;
+ /* Pipeline parameters. */
int pages_per_stage;
/* Wasted space in each stage */
int excess_bh_size;
/* the tape is write protected (hardware or opened as read-only) */
char write_prot;
- /*
- * Limit the number of times a request can be postponed, to avoid an
- * infinite postpone deadlock.
- */
- int postpone_cnt;
-
- /* Speed control at the tape buffers input/output */
- unsigned long insert_time;
- int insert_size;
- int insert_speed;
- int measure_insert_time;
-
u32 debug_mask;
} idetape_tape_t;
int blocks = tape->pc->xferred / tape->blk_size;
tape->avg_size += blocks * tape->blk_size;
- tape->insert_size += blocks * tape->blk_size;
- if (tape->insert_size > 1024 * 1024)
- tape->measure_insert_time = 1;
- if (tape->measure_insert_time) {
- tape->measure_insert_time = 0;
- tape->insert_time = jiffies;
- tape->insert_size = 0;
- }
- if (time_after(jiffies, tape->insert_time))
- tape->insert_speed = tape->insert_size / 1024 * HZ /
- (jiffies - tape->insert_time);
+
if (time_after_eq(jiffies, tape->avg_time + HZ)) {
tape->avg_speed = tape->avg_size * HZ /
(jiffies - tape->avg_time) / 1024;
drive->post_reset = 0;
}
- if (time_after(jiffies, tape->insert_time))
- tape->insert_speed = tape->insert_size / 1024 * HZ /
- (jiffies - tape->insert_time);
if (!test_and_clear_bit(IDETAPE_FLAG_IGNORE_DSC, &tape->flags) &&
(stat & SEEK_STAT) == 0) {
if (postponed_rq == NULL) {
return ide_stopped;
}
if (rq->cmd[0] & REQ_IDETAPE_READ) {
- tape->postpone_cnt = 0;
pc = idetape_next_pc_storage(drive);
idetape_create_read_cmd(tape, pc, rq->current_nr_sectors,
(struct idetape_bh *)rq->special);
goto out;
}
if (rq->cmd[0] & REQ_IDETAPE_WRITE) {
- tape->postpone_cnt = 0;
pc = idetape_next_pc_storage(drive);
idetape_create_write_cmd(tape, pc, rq->current_nr_sectors,
(struct idetape_bh *)rq->special);
static int __idetape_discard_read_pipeline(ide_drive_t *drive)
{
idetape_tape_t *tape = drive->driver_data;
- unsigned long flags;
- int cnt;
if (tape->chrdev_dir != IDETAPE_DIR_READ)
return 0;
- /* Remove merge stage. */
- cnt = tape->merge_stage_size / tape->blk_size;
- if (test_and_clear_bit(IDETAPE_FLAG_FILEMARK, &tape->flags))
- ++cnt; /* Filemarks count as 1 sector */
+ clear_bit(IDETAPE_FLAG_FILEMARK, &tape->flags);
tape->merge_stage_size = 0;
if (tape->merge_stage != NULL) {
__idetape_kfree_stage(tape->merge_stage);
tape->chrdev_dir = IDETAPE_DIR_NONE;
- /* Remove pipeline stages. */
- if (tape->first_stage == NULL)
- return 0;
-
- spin_lock_irqsave(&tape->lock, flags);
- tape->next_stage = NULL;
- spin_unlock_irqrestore(&tape->lock, flags);
-
- while (tape->first_stage != NULL) {
- struct request *rq_ptr = &tape->first_stage->rq;
-
- cnt += rq_ptr->nr_sectors - rq_ptr->current_nr_sectors;
- if (rq_ptr->errors == IDETAPE_ERROR_FILEMARK)
- ++cnt;
- }
- tape->nr_pending_stages = 0;
- tape->max_stages = tape->min_pipeline;
- return cnt;
+ return 0;
}
/*
tape->merge_stage = NULL;
}
tape->chrdev_dir = IDETAPE_DIR_NONE;
-
- /*
- * On the next backup, perform the feedback loop again. (I don't want to
- * keep sense information between backups, as some systems are
- * constantly on, and the system load can be totally different on the
- * next backup).
- */
- tape->max_stages = tape->min_pipeline;
- if (tape->first_stage != NULL ||
- tape->next_stage != NULL ||
- tape->last_stage != NULL ||
- tape->nr_stages != 0) {
- printk(KERN_ERR "ide-tape: ide-tape pipeline bug, "
- "first_stage %p, next_stage %p, "
- "last_stage %p, nr_stages %d\n",
- tape->first_stage, tape->next_stage,
- tape->last_stage, tape->nr_stages);
- }
}
-static int idetape_init_read(ide_drive_t *drive, int max_stages)
+static int idetape_init_read(ide_drive_t *drive)
{
idetape_tape_t *tape = drive->driver_data;
int bytes_read;
}
}
- if (tape->nr_pending_stages >= 3 * max_stages / 4) {
- tape->measure_insert_time = 1;
- tape->insert_time = jiffies;
- tape->insert_size = 0;
- tape->insert_speed = 0;
- }
-
return 0;
}
if (test_bit(IDETAPE_FLAG_FILEMARK, &tape->flags))
return 0;
- idetape_init_read(drive, tape->max_stages);
+ idetape_init_read(drive);
return idetape_queue_rw_tail(drive, REQ_IDETAPE_READ, blocks,
tape->merge_stage->bh);
if (copy_from_user(&config, argp, sizeof(config)))
return -EFAULT;
tape->best_dsc_rw_freq = config.dsc_rw_frequency;
- tape->max_stages = config.nr_stages;
break;
case 0x0350:
config.dsc_rw_frequency = (int) tape->best_dsc_rw_freq;
- config.nr_stages = tape->max_stages;
+ config.nr_stages = 1;
if (copy_to_user(argp, &config, sizeof(config)))
return -EFAULT;
break;
(count % tape->blk_size) == 0)
tape->user_bs_factor = count / tape->blk_size;
}
- rc = idetape_init_read(drive, tape->max_stages);
+ rc = idetape_init_read(drive);
if (rc < 0)
return rc;
if (count == 0)
ide_add_setting(drive, "buffer", SETTING_READ, TYPE_SHORT, 0, 0xffff,
1, 2, (u16 *)&tape->caps[16], NULL);
- ide_add_setting(drive, "pipeline_min", SETTING_RW, TYPE_INT, 1, 0xffff,
- tape->stage_size / 1024, 1, &tape->min_pipeline, NULL);
- ide_add_setting(drive, "pipeline", SETTING_RW, TYPE_INT, 1, 0xffff,
- tape->stage_size / 1024, 1, &tape->max_stages, NULL);
- ide_add_setting(drive, "pipeline_max", SETTING_RW, TYPE_INT, 1, 0xffff,
- tape->stage_size / 1024, 1, &tape->max_pipeline, NULL);
- ide_add_setting(drive, "pipeline_used", SETTING_READ, TYPE_INT, 0,
- 0xffff, tape->stage_size / 1024, 1, &tape->nr_stages,
- NULL);
- ide_add_setting(drive, "pipeline_pending", SETTING_READ, TYPE_INT, 0,
- 0xffff, tape->stage_size / 1024, 1,
- &tape->nr_pending_stages, NULL);
ide_add_setting(drive, "speed", SETTING_READ, TYPE_SHORT, 0, 0xffff,
1, 1, (u16 *)&tape->caps[14], NULL);
ide_add_setting(drive, "stage", SETTING_READ, TYPE_INT, 0, 0xffff, 1,
*/
static void idetape_setup(ide_drive_t *drive, idetape_tape_t *tape, int minor)
{
- unsigned long t1, tmid, tn, t;
+ unsigned long t;
int speed;
int stage_size;
u8 gcw[2];
- struct sysinfo si;
u16 *ctl = (u16 *)&tape->caps[12];
spin_lock_init(&tape->lock);
if (((gcw[0] & 0x60) >> 5) == 1)
set_bit(IDETAPE_FLAG_DRQ_INTERRUPT, &tape->flags);
- tape->min_pipeline = 10;
- tape->max_pipeline = 10;
- tape->max_stages = 10;
-
idetape_get_inquiry_results(drive);
idetape_get_mode_sense_results(drive);
ide_tape_get_bsize_from_bdesc(drive);
tape->excess_bh_size = PAGE_SIZE - stage_size % PAGE_SIZE;
}
- /* Select the "best" DSC read/write polling freq and pipeline size. */
+ /* select the "best" DSC read/write polling freq */
speed = max(*(u16 *)&tape->caps[14], *(u16 *)&tape->caps[8]);
- tape->max_stages = speed * 1000 * 10 / tape->stage_size;
-
- /* Limit memory use for pipeline to 10% of physical memory */
- si_meminfo(&si);
- if (tape->max_stages * tape->stage_size >
- si.totalram * si.mem_unit / 10)
- tape->max_stages =
- si.totalram * si.mem_unit / (10 * tape->stage_size);
-
- tape->max_stages = min(tape->max_stages, IDETAPE_MAX_PIPELINE_STAGES);
- tape->min_pipeline = min(tape->max_stages, IDETAPE_MIN_PIPELINE_STAGES);
- tape->max_pipeline =
- min(tape->max_stages * 2, IDETAPE_MAX_PIPELINE_STAGES);
- if (tape->max_stages == 0) {
- tape->max_stages = 1;
- tape->min_pipeline = 1;
- tape->max_pipeline = 1;
- }
-
- t1 = (tape->stage_size * HZ) / (speed * 1000);
- tmid = (*(u16 *)&tape->caps[16] * 32 * HZ) / (speed * 125);
- tn = (IDETAPE_FIFO_THRESHOLD * tape->stage_size * HZ) / (speed * 1000);
-
- if (tape->max_stages)
- t = tn;
- else
- t = t1;
+ t = (IDETAPE_FIFO_THRESHOLD * tape->stage_size * HZ) / (speed * 1000);
/*
* Ensure that the number we got makes sense; limit it within
min_t(unsigned long, t, IDETAPE_DSC_RW_MAX),
IDETAPE_DSC_RW_MIN);
printk(KERN_INFO "ide-tape: %s <-> %s: %dKBps, %d*%dkB buffer, "
- "%dkB pipeline, %lums tDSC%s\n",
+ "%lums tDSC%s\n",
drive->name, tape->name, *(u16 *)&tape->caps[14],
(*(u16 *)&tape->caps[16] * 512) / tape->stage_size,
tape->stage_size / 1024,
- tape->max_stages * tape->stage_size / 1024,
tape->best_dsc_rw_freq * 1000 / HZ,
drive->using_dma ? ", DMA":"");
ide_drive_t *drive = tape->drive;
struct gendisk *g = tape->disk;
- BUG_ON(tape->first_stage != NULL || tape->merge_stage_size);
+ BUG_ON(tape->merge_stage_size);
drive->dsc_overlap = 0;
drive->driver_data = NULL;
projects / linux-2.6 / commitdiff