Skip to content

Commit

Permalink
ide-tape: remove struct idetape_capabilities_page_t
Browse files Browse the repository at this point in the history 
All those 2-byte values denoting the different capabilities are being written to
the local copy of the caps buffer without being converted to big endian for
simplicity of usage and shorter code later.  Also, we add some comments stating
which are the fields of the caps page in question in order to alleviate the
cryptic pointer casting exercises as in e.g. idetape_get_mode_sense_results().

There should be no functional changes resulting from this patch.

Bart:
- remove two needless "!!"

Signed-off-by: Borislav Petkov <bbpetkov@yahoo.de>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
  • Loading branch information
@bzolnier
Borislav Petkov authored and bzolnier committed Feb 2, 2008
1 parent 55a5d29 commit b642201
Showing 1 changed file with 56 additions and 86 deletions.
142 changes: 56 additions & 86 deletions drivers/ide/ide-tape.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -259,47 +259,6 @@ typedef struct idetape_packet_command_s {
/* Data direction */
#define PC_WRITING 5

/*
* Capabilities and Mechanical Status Page
*/
typedef struct {
unsigned page_code :6; /* Page code - Should be 0x2a */
__u8 reserved0_6 :1;
__u8 ps :1; /* parameters saveable */
__u8 page_length; /* Page Length - Should be 0x12 */
__u8 reserved2, reserved3;
unsigned ro :1; /* Read Only Mode */
unsigned reserved4_1234 :4;
unsigned sprev :1; /* Supports SPACE in the reverse direction */
unsigned reserved4_67 :2;
unsigned reserved5_012 :3;
unsigned efmt :1; /* Supports ERASE command initiated formatting */
unsigned reserved5_4 :1;
unsigned qfa :1; /* Supports the QFA two partition formats */
unsigned reserved5_67 :2;
unsigned lock :1; /* Supports locking the volume */
unsigned locked :1; /* The volume is locked */
unsigned prevent :1; /* The device defaults in the prevent state after power up */
unsigned eject :1; /* The device can eject the volume */
__u8 disconnect :1; /* The device can break request > ctl */
__u8 reserved6_5 :1;
unsigned ecc :1; /* Supports error correction */
unsigned cmprs :1; /* Supports data compression */
unsigned reserved7_0 :1;
unsigned blk512 :1; /* Supports 512 bytes block size */
unsigned blk1024 :1; /* Supports 1024 bytes block size */
unsigned reserved7_3_6 :4;
unsigned blk32768 :1; /* slowb - the device restricts the byte count for PIO */
/* transfers for slow buffer memory ??? */
/* Also 32768 block size in some cases */
__u16 max_speed; /* Maximum speed supported in KBps */
__u8 reserved10, reserved11;
__u16 ctl; /* Continuous Transfer Limit in blocks */
__u16 speed; /* Current Speed, in KBps */
__u16 buffer_size; /* Buffer Size, in 512 bytes */
__u8 reserved18, reserved19;
} idetape_capabilities_page_t;

/*
* Block Size Page
*/
Expand Down Expand Up @@ -417,8 +376,9 @@ typedef struct ide_tape_obj {
/* Usually 512 or 1024 bytes */
unsigned short tape_block_size;
int user_bs_factor;

/* Copy of the tape's Capabilities and Mechanical Page */
idetape_capabilities_page_t capabilities;
u8 caps[20];

/*
* Active data transfer request parameters.
Expand Down Expand Up @@ -2464,7 +2424,8 @@ static int idetape_create_prevent_cmd (ide_drive_t *drive, idetape_pc_t *pc, int
{
idetape_tape_t *tape = drive->driver_data;

if (!tape->capabilities.lock)
/* device supports locking according to capabilities page */
if (!(tape->caps[6] & 0x01))
return 0;

idetape_init_pc(pc);
Expand Down Expand Up @@ -2850,7 +2811,7 @@ static int idetape_initiate_read (ide_drive_t *drive, int max_stages)
idetape_stage_t *new_stage;
struct request rq;
int bytes_read;
int blocks = tape->capabilities.ctl;
u16 blocks = *(u16 *)&tape->caps[12];

/* Initialize read operation */
if (tape->chrdev_direction != idetape_direction_read) {
Expand Down Expand Up @@ -3090,11 +3051,12 @@ static int idetape_space_over_filemarks (ide_drive_t *drive,short mt_op,int mt_c
idetape_pc_t pc;
unsigned long flags;
int retval,count=0;
int sprev = !!(tape->caps[4] & 0x20);

if (mt_count == 0)
return 0;
if (MTBSF == mt_op || MTBSFM == mt_op) {
if (!tape->capabilities.sprev)
if (!sprev)
return -EIO;
mt_count = - mt_count;
}
Expand Down Expand Up @@ -3148,7 +3110,7 @@ static int idetape_space_over_filemarks (ide_drive_t *drive,short mt_op,int mt_c
return (idetape_queue_pc_tail(drive, &pc));
case MTFSFM:
case MTBSFM:
if (!tape->capabilities.sprev)
if (!sprev)
return (-EIO);
retval = idetape_space_over_filemarks(drive, MTFSF, mt_count-count);
if (retval) return (retval);
Expand Down Expand Up @@ -3185,6 +3147,7 @@ static ssize_t idetape_chrdev_read (struct file *file, char __user *buf,
ide_drive_t *drive = tape->drive;
ssize_t bytes_read,temp, actually_read = 0, rc;
ssize_t ret = 0;
u16 ctl = *(u16 *)&tape->caps[12];

#if IDETAPE_DEBUG_LOG
if (tape->debug_level >= 3)
Expand All @@ -3210,7 +3173,7 @@ static ssize_t idetape_chrdev_read (struct file *file, char __user *buf,
count -= actually_read;
}
while (count >= tape->stage_size) {
bytes_read = idetape_add_chrdev_read_request(drive, tape->capabilities.ctl);
bytes_read = idetape_add_chrdev_read_request(drive, ctl);
if (bytes_read <= 0)
goto finish;
if (idetape_copy_stage_to_user(tape, buf, tape->merge_stage, bytes_read))
Expand All @@ -3220,7 +3183,7 @@ static ssize_t idetape_chrdev_read (struct file *file, char __user *buf,
actually_read += bytes_read;
}
if (count) {
bytes_read = idetape_add_chrdev_read_request(drive, tape->capabilities.ctl);
bytes_read = idetape_add_chrdev_read_request(drive, ctl);
if (bytes_read <= 0)
goto finish;
temp = min((unsigned long)count, (unsigned long)bytes_read);
Expand Down Expand Up @@ -3249,6 +3212,7 @@ static ssize_t idetape_chrdev_write (struct file *file, const char __user *buf,
ide_drive_t *drive = tape->drive;
ssize_t actually_written = 0;
ssize_t ret = 0;
u16 ctl = *(u16 *)&tape->caps[12];

/* The drive is write protected. */
if (tape->write_prot)
Expand Down Expand Up @@ -3310,7 +3274,7 @@ static ssize_t idetape_chrdev_write (struct file *file, const char __user *buf,
if (tape->merge_stage_size == tape->stage_size) {
ssize_t retval;
tape->merge_stage_size = 0;
retval = idetape_add_chrdev_write_request(drive, tape->capabilities.ctl);
retval = idetape_add_chrdev_write_request(drive, ctl);
if (retval <= 0)
return (retval);
}
Expand All @@ -3321,7 +3285,7 @@ static ssize_t idetape_chrdev_write (struct file *file, const char __user *buf,
ret = -EFAULT;
buf += tape->stage_size;
count -= tape->stage_size;
retval = idetape_add_chrdev_write_request(drive, tape->capabilities.ctl);
retval = idetape_add_chrdev_write_request(drive, ctl);
actually_written += tape->stage_size;
if (retval <= 0)
return (retval);
Expand Down Expand Up @@ -3821,46 +3785,52 @@ static void idetape_get_inquiry_results (ide_drive_t *drive)
}

/*
* idetape_get_mode_sense_results asks the tape about its various
* parameters. In particular, we will adjust our data transfer buffer
* size to the recommended value as returned by the tape.
* Ask the tape about its various parameters. In particular, we will adjust our
* data transfer buffer size to the recommended value as returned by the tape.
*/
static void idetape_get_mode_sense_results (ide_drive_t *drive)
{
idetape_tape_t *tape = drive->driver_data;
idetape_pc_t pc;
idetape_capabilities_page_t *capabilities;
u8 *caps;
u8 speed, max_speed;

idetape_create_mode_sense_cmd(&pc, IDETAPE_CAPABILITIES_PAGE);
if (idetape_queue_pc_tail(drive, &pc)) {
printk(KERN_ERR "ide-tape: Can't get tape parameters - assuming some default values\n");
printk(KERN_ERR "ide-tape: Can't get tape parameters - assuming"
" some default values\n");
tape->tape_block_size = 512;
tape->capabilities.ctl = 52;
tape->capabilities.speed = 450;
tape->capabilities.buffer_size = 6 * 52;
put_unaligned(52, (u16 *)&tape->caps[12]);
put_unaligned(540, (u16 *)&tape->caps[14]);
put_unaligned(6*52, (u16 *)&tape->caps[16]);
return;
}
capabilities = (idetape_capabilities_page_t *)
(pc.buffer + 4 + pc.buffer[3]);
caps = pc.buffer + 4 + pc.buffer[3];

/* convert to host order and save for later use */
speed = be16_to_cpu(*(u16 *)&caps[14]);
max_speed = be16_to_cpu(*(u16 *)&caps[8]);

capabilities->max_speed = ntohs(capabilities->max_speed);
capabilities->ctl = ntohs(capabilities->ctl);
capabilities->speed = ntohs(capabilities->speed);
capabilities->buffer_size = ntohs(capabilities->buffer_size);
put_unaligned(max_speed, (u16 *)&caps[8]);
put_unaligned(be16_to_cpu(*(u16 *)&caps[12]), (u16 *)&caps[12]);
put_unaligned(speed, (u16 *)&caps[14]);
put_unaligned(be16_to_cpu(*(u16 *)&caps[16]), (u16 *)&caps[16]);

if (!capabilities->speed) {
printk(KERN_INFO "ide-tape: %s: overriding capabilities->speed (assuming 650KB/sec)\n", drive->name);
capabilities->speed = 650;
if (!speed) {
printk(KERN_INFO "ide-tape: %s: invalid tape speed "
"(assuming 650KB/sec)\n", drive->name);
put_unaligned(650, (u16 *)&caps[14]);
}
if (!capabilities->max_speed) {
printk(KERN_INFO "ide-tape: %s: overriding capabilities->max_speed (assuming 650KB/sec)\n", drive->name);
capabilities->max_speed = 650;
if (!max_speed) {
printk(KERN_INFO "ide-tape: %s: invalid max_speed "
"(assuming 650KB/sec)\n", drive->name);
put_unaligned(650, (u16 *)&caps[8]);
}

tape->capabilities = *capabilities; /* Save us a copy */
if (capabilities->blk512)
memcpy(&tape->caps, caps, 20);
if (caps[7] & 0x02)
tape->tape_block_size = 512;
else if (capabilities->blk1024)
else if (caps[7] & 0x04)
tape->tape_block_size = 1024;
}

Expand Down Expand Up @@ -3897,13 +3867,15 @@ static void idetape_add_settings (ide_drive_t *drive)
/*
* drive setting name read/write data type min max mul_factor div_factor data pointer set function
*/
ide_add_setting(drive, "buffer", SETTING_READ, TYPE_SHORT, 0, 0xffff, 1, 2, &tape->capabilities.buffer_size, NULL);
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, &tape->capabilities.speed, 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, 1024, &tape->stage_size, NULL);
ide_add_setting(drive, "tdsc", SETTING_RW, TYPE_INT, IDETAPE_DSC_RW_MIN, IDETAPE_DSC_RW_MAX, 1000, HZ, &tape->best_dsc_rw_frequency, NULL);
ide_add_setting(drive, "dsc_overlap", SETTING_RW, TYPE_BYTE, 0, 1, 1, 1, &drive->dsc_overlap, NULL);
Expand Down Expand Up @@ -3935,6 +3907,7 @@ static void idetape_setup (ide_drive_t *drive, idetape_tape_t *tape, int minor)
struct idetape_id_gcw gcw;
int stage_size;
struct sysinfo si;
u16 *ctl = (u16 *)&tape->caps[12];

spin_lock_init(&tape->spinlock);
drive->dsc_overlap = 1;
Expand Down Expand Up @@ -3964,11 +3937,11 @@ static void idetape_setup (ide_drive_t *drive, idetape_tape_t *tape, int minor)
idetape_get_mode_sense_results(drive);
idetape_get_blocksize_from_block_descriptor(drive);
tape->user_bs_factor = 1;
tape->stage_size = tape->capabilities.ctl * tape->tape_block_size;
tape->stage_size = *ctl * tape->tape_block_size;
while (tape->stage_size > 0xffff) {
printk(KERN_NOTICE "ide-tape: decreasing stage size\n");
tape->capabilities.ctl /= 2;
tape->stage_size = tape->capabilities.ctl * tape->tape_block_size;
*ctl /= 2;
tape->stage_size = *ctl * tape->tape_block_size;
}
stage_size = tape->stage_size;
tape->pages_per_stage = stage_size / PAGE_SIZE;
Expand All @@ -3977,11 +3950,8 @@ static void idetape_setup (ide_drive_t *drive, idetape_tape_t *tape, int minor)
tape->excess_bh_size = PAGE_SIZE - stage_size % PAGE_SIZE;
}

/*
* Select the "best" DSC read/write polling frequency
* and pipeline size.
*/
speed = max(tape->capabilities.speed, tape->capabilities.max_speed);
/* Select the "best" DSC read/write polling freq and pipeline size. */
speed = max(*(u16 *)&tape->caps[14], *(u16 *)&tape->caps[8]);

tape->max_stages = speed * 1000 * 10 / tape->stage_size;

Expand All @@ -3998,7 +3968,7 @@ static void idetape_setup (ide_drive_t *drive, idetape_tape_t *tape, int minor)
tape->max_stages = tape->min_pipeline = tape->max_pipeline = 1;

t1 = (tape->stage_size * HZ) / (speed * 1000);
tmid = (tape->capabilities.buffer_size * 32 * HZ) / (speed * 125);
tmid = (*(u16 *)&tape->caps[16] * 32 * HZ) / (speed * 125);
tn = (IDETAPE_FIFO_THRESHOLD * tape->stage_size * HZ) / (speed * 1000);

if (tape->max_stages)
Expand All @@ -4013,8 +3983,8 @@ static void idetape_setup (ide_drive_t *drive, idetape_tape_t *tape, int minor)
tape->best_dsc_rw_frequency = max_t(unsigned long, 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",
drive->name, tape->name, tape->capabilities.speed,
(tape->capabilities.buffer_size * 512) / tape->stage_size,
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_frequency * 1000 / HZ,
Expand Down

0 comments on commit b642201

Please sign in to comment.