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Commit acaa0f5f authored by Bartlomiej Zolnierkiewicz's avatar Bartlomiej Zolnierkiewicz
Browse files

ide: add ide_io_buffers() helper 



* Make ->io_buffers method return number of bytes transferred.

* Use ide_end_request() instead of idefloppy_end_request()
  in ide_floppy_io_buffers() and then move the call out to
  ide_pc_intr().

* Add ide_io_buffers() helper and convert ide-{floppy,scsi}.c
  to use it instead of ide*_io_buffers().

There should be no functional changes caused by this patch.

Acked-by: default avatarBorislav Petkov <petkovbb@gmail.com>
Signed-off-by: default avatarBartlomiej Zolnierkiewicz <bzolnier@gmail.com>
parent c860f955

drivers/ide/ide-atapi.c

+59 −4
Original line number Diff line number Diff line
@@ -61,12 +61,62 @@ int ide_check_atapi_device(ide_drive_t *drive, const char *s) 
}

EXPORT_SYMBOL_GPL(ide_check_atapi_device);



/* PIO data transfer routine using the scatter gather table. */

int ide_io_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,

		    unsigned int bcount, int write)

{

	ide_hwif_t *hwif = drive->hwif;

	const struct ide_tp_ops *tp_ops = hwif->tp_ops;

	xfer_func_t *xf = write ? tp_ops->output_data : tp_ops->input_data;

	struct scatterlist *sg = pc->sg;

	char *buf;

	int count, done = 0;



	while (bcount) {

		count = min(sg->length - pc->b_count, bcount);



		if (PageHighMem(sg_page(sg))) {

			unsigned long flags;



			local_irq_save(flags);

			buf = kmap_atomic(sg_page(sg), KM_IRQ0) + sg->offset;

			xf(drive, NULL, buf + pc->b_count, count);

			kunmap_atomic(buf - sg->offset, KM_IRQ0);

			local_irq_restore(flags);

		} else {

			buf = sg_virt(sg);

			xf(drive, NULL, buf + pc->b_count, count);

		}



		bcount -= count;

		pc->b_count += count;

		done += count;



		if (pc->b_count == sg->length) {

			if (!--pc->sg_cnt)

				break;

			pc->sg = sg = sg_next(sg);

			pc->b_count = 0;

		}

	}



	if (bcount) {

		printk(KERN_ERR "%s: %d leftover bytes, %s\n", drive->name,

			bcount, write ? "padding with zeros"

				      : "discarding data");

		ide_pad_transfer(drive, write, bcount);

	}



	return done;

}

EXPORT_SYMBOL_GPL(ide_io_buffers);



/* TODO: unify the code thus making some arguments go away */

ide_startstop_t ide_pc_intr(ide_drive_t *drive, struct ide_atapi_pc *pc,

	ide_handler_t *handler, unsigned int timeout, ide_expiry_t *expiry,

	void (*update_buffers)(ide_drive_t *, struct ide_atapi_pc *),

	void (*retry_pc)(ide_drive_t *), void (*dsc_handle)(ide_drive_t *),

	void (*io_buffers)(ide_drive_t *, struct ide_atapi_pc *, unsigned, int))

	int (*io_buffers)(ide_drive_t *, struct ide_atapi_pc *, unsigned, int))

{

	ide_hwif_t *hwif = drive->hwif;

	struct request *rq = hwif->hwgroup->rq;
@@ -219,9 +269,14 @@ ide_startstop_t ide_pc_intr(ide_drive_t *drive, struct ide_atapi_pc *pc, 


	if ((drive->media == ide_floppy && !scsi && !pc->buf) ||

	    (drive->media == ide_tape && !scsi && pc->bh) ||

	    (scsi && pc->sg))

		io_buffers(drive, pc, bcount, !!(pc->flags & PC_FLAG_WRITING));

	else

	    (scsi && pc->sg)) {

		int done = io_buffers(drive, pc, bcount,

				  !!(pc->flags & PC_FLAG_WRITING));



		/* FIXME: don't do partial completions */

		if (drive->media == ide_floppy && !scsi)

			ide_end_request(drive, 1, done >> 9);

	} else

		xferfunc(drive, NULL, pc->cur_pos, bcount);



	/* Update the current position */

drivers/ide/ide-floppy.c

+1 −46
Original line number Diff line number Diff line
@@ -208,51 +208,6 @@ static int idefloppy_end_request(ide_drive_t *drive, int uptodate, int nsecs) 
	return 0;

}



static void ide_floppy_io_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,

				  unsigned int bcount, int direction)

{

	ide_hwif_t *hwif = drive->hwif;

	const struct ide_tp_ops *tp_ops = hwif->tp_ops;

	xfer_func_t *xf = direction ? tp_ops->output_data : tp_ops->input_data;

	struct scatterlist *sg = pc->sg;

	char *buf;

	int count, done = 0;



	while (bcount) {

		count = min(sg->length - pc->b_count, bcount);

		if (PageHighMem(sg_page(sg))) {

			unsigned long flags;



			local_irq_save(flags);

			buf = kmap_atomic(sg_page(sg), KM_IRQ0) + sg->offset;

			xf(drive, NULL, buf + pc->b_count, count);

			kunmap_atomic(buf - sg->offset, KM_IRQ0);

			local_irq_restore(flags);

		} else {

			buf = sg_virt(sg);

			xf(drive, NULL, buf + pc->b_count, count);

		}

		bcount -= count;

		pc->b_count += count;

		done += count;



		if (pc->b_count == sg->length) {

			if (!--pc->sg_cnt)

				break;

			pc->sg = sg = sg_next(sg);

			pc->b_count = 0;

		}

	}



	idefloppy_end_request(drive, 1, done >> 9);



	if (bcount) {

		printk(KERN_ERR "%s: leftover data in %s, bcount == %d\n",

				drive->name, __func__, bcount);

		ide_pad_transfer(drive, direction, bcount);

	}

}



static void idefloppy_update_buffers(ide_drive_t *drive,

				struct ide_atapi_pc *pc)

{
@@ -356,7 +311,7 @@ static ide_startstop_t idefloppy_pc_intr(ide_drive_t *drive) 


	return ide_pc_intr(drive, floppy->pc, idefloppy_pc_intr,

			   IDEFLOPPY_WAIT_CMD, NULL, idefloppy_update_buffers,

			   idefloppy_retry_pc, NULL, ide_floppy_io_buffers);

			   idefloppy_retry_pc, NULL, ide_io_buffers);

}



/*

drivers/ide/ide-tape.c

+3 −1
Original line number Diff line number Diff line
@@ -693,13 +693,15 @@ static void ide_tape_handle_dsc(ide_drive_t *drive) 
	idetape_postpone_request(drive);

}



static void ide_tape_io_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,

static int ide_tape_io_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,

				unsigned int bcount, int write)

{

	if (write)

		idetape_output_buffers(drive, pc, bcount);

	else

		idetape_input_buffers(drive, pc, bcount);



	return bcount;

}



/*

drivers/scsi/ide-scsi.c

+1 −45
Original line number Diff line number Diff line
@@ -130,50 +130,6 @@ static inline idescsi_scsi_t *drive_to_idescsi(ide_drive_t *ide_drive) 
	return scsihost_to_idescsi(ide_drive->driver_data);

}



/*

 *	PIO data transfer routine using the scatter gather table.

 */

static void ide_scsi_io_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,

				unsigned int bcount, int write)

{

	ide_hwif_t *hwif = drive->hwif;

	const struct ide_tp_ops *tp_ops = hwif->tp_ops;

	xfer_func_t *xf = write ? tp_ops->output_data : tp_ops->input_data;

	struct scatterlist *sg = pc->sg;

	char *buf;

	int count;



	while (bcount) {

		count = min(sg->length - pc->b_count, bcount);

		if (PageHighMem(sg_page(sg))) {

			unsigned long flags;



			local_irq_save(flags);

			buf = kmap_atomic(sg_page(sg), KM_IRQ0) + sg->offset;

			xf(drive, NULL, buf + pc->b_count, count);

			kunmap_atomic(buf - sg->offset, KM_IRQ0);

			local_irq_restore(flags);

		} else {

			buf = sg_virt(sg);

			xf(drive, NULL, buf + pc->b_count, count);

		}

		bcount -= count; pc->b_count += count;

		if (pc->b_count == sg->length) {

			if (!--pc->sg_cnt)

				break;

			pc->sg = sg = sg_next(sg);

			pc->b_count = 0;

		}

	}



	if (bcount) {

		printk(KERN_ERR "%s: scatter gather table too small, %s\n",

				drive->name, write ? "padding with zeros"

						   : "discarding data");

		ide_pad_transfer(drive, write, bcount);

	}

}



static void ide_scsi_hex_dump(u8 *data, int len)

{

	print_hex_dump(KERN_CONT, "", DUMP_PREFIX_NONE, 16, 1, data, len, 0);
@@ -343,7 +299,7 @@ static ide_startstop_t idescsi_pc_intr (ide_drive_t *drive) 


	return ide_pc_intr(drive, pc, idescsi_pc_intr, get_timeout(pc),

			   idescsi_expiry, NULL, NULL, NULL,

			   ide_scsi_io_buffers);

			   ide_io_buffers);

}



static ide_startstop_t idescsi_transfer_pc(ide_drive_t *drive)

include/linux/ide.h

+3 −1
Original line number Diff line number Diff line
@@ -1099,6 +1099,8 @@ void ide_tf_read(ide_drive_t *, ide_task_t *); 
void ide_input_data(ide_drive_t *, struct request *, void *, unsigned int);

void ide_output_data(ide_drive_t *, struct request *, void *, unsigned int);



int ide_io_buffers(ide_drive_t *, struct ide_atapi_pc *, unsigned int, int);



extern void SELECT_DRIVE(ide_drive_t *);

void SELECT_MASK(ide_drive_t *, int);
@@ -1115,7 +1117,7 @@ ide_startstop_t ide_pc_intr(ide_drive_t *drive, struct ide_atapi_pc *pc, 
	ide_handler_t *handler, unsigned int timeout, ide_expiry_t *expiry,

	void (*update_buffers)(ide_drive_t *, struct ide_atapi_pc *),

	void (*retry_pc)(ide_drive_t *), void (*dsc_handle)(ide_drive_t *),

	void (*io_buffers)(ide_drive_t *, struct ide_atapi_pc *, unsigned int,

	int (*io_buffers)(ide_drive_t *, struct ide_atapi_pc *, unsigned int,

			   int));

ide_startstop_t ide_transfer_pc(ide_drive_t *, struct ide_atapi_pc *,

				ide_handler_t *, unsigned int, ide_expiry_t *);