From: Bartlomiej Zolnierkiewicz Subject: [PATCH] ide-disk: use do_rw_taskfile() * Add IDE_TFLAG_DMA_PIO_FALLBACK taskfile flag to indicate the need to skip loading taskfile registers in do_rw_taskfile(). * Export do_rw_taskfile(). * Convert __ide_do_rw_disk() to use do_rw_taskfile(). * Unexport ide_tf_load(). * Unexport {pre_task_out,task_in}_intr() and make it static. * Remove incorrect comment about do_rw_taskfile() from . There should be no functionality changes caused by this patch. Signed-off-by: Bartlomiej Zolnierkiewicz --- drivers/ide/ide-disk.c | 29 ++++++++++------------------- drivers/ide/ide-taskfile.c | 14 +++++++------- include/linux/ide.h | 9 ++------- 3 files changed, 19 insertions(+), 33 deletions(-) Index: b/drivers/ide/ide-disk.c =================================================================== --- a/drivers/ide/ide-disk.c +++ b/drivers/ide/ide-disk.c @@ -211,6 +211,7 @@ static ide_startstop_t __ide_do_rw_disk( u8 lba48 = (drive->addressing == 1) ? 1 : 0; ide_task_t task; struct ide_taskfile *tf = &task.tf; + ide_startstop_t rc; if ((hwif->host_flags & IDE_HFLAG_NO_LBA48_DMA) && lba48 && dma) { if (block + rq->nr_sectors > 1ULL << 28) @@ -278,32 +279,22 @@ static ide_startstop_t __ide_do_rw_disk( task.tf_flags |= IDE_TFLAG_WRITE; ide_tf_set_cmd(drive, &task, dma); + if (!dma) + hwif->data_phase = task.data_phase; + task.rq = rq; - ide_tf_load(drive, &task); + rc = do_rw_taskfile(drive, &task); - if (dma) { - if (!hwif->dma_setup(drive)) { - hwif->dma_exec_cmd(drive, tf->command); - hwif->dma_start(drive); - return ide_started; - } + if (rc == ide_stopped && dma) { /* fallback to PIO */ + task.tf_flags |= IDE_TFLAG_DMA_PIO_FALLBACK; ide_tf_set_cmd(drive, &task, 0); + hwif->data_phase = task.data_phase; ide_init_sg_cmd(drive, rq); + rc = do_rw_taskfile(drive, &task); } - hwif->data_phase = task.data_phase; - - if (rq_data_dir(rq) == READ) { - ide_execute_command(drive, tf->command, &task_in_intr, - WAIT_WORSTCASE, NULL); - return ide_started; - } else { - hwif->OUTBSYNC(drive, tf->command, IDE_COMMAND_REG); - ndelay(400); /* FIXME */ - - return pre_task_out_intr(drive, rq); - } + return rc; } /* Index: b/drivers/ide/ide-taskfile.c =================================================================== --- a/drivers/ide/ide-taskfile.c +++ b/drivers/ide/ide-taskfile.c @@ -114,8 +114,6 @@ void ide_tf_load(ide_drive_t *drive, ide hwif->OUTB((tf->device & HIHI) | drive->select.all, IDE_SELECT_REG); } -EXPORT_SYMBOL_GPL(ide_tf_load); - int taskfile_lib_get_identify (ide_drive_t *drive, u8 *buf) { ide_task_t args; @@ -154,6 +152,8 @@ static ide_startstop_t task_no_data_intr static ide_startstop_t set_geometry_intr(ide_drive_t *); static ide_startstop_t recal_intr(ide_drive_t *); static ide_startstop_t set_multmode_intr(ide_drive_t *); +static ide_startstop_t pre_task_out_intr(ide_drive_t *, struct request *); +static ide_startstop_t task_in_intr(ide_drive_t *); ide_startstop_t do_rw_taskfile (ide_drive_t *drive, ide_task_t *task) { @@ -173,7 +173,8 @@ ide_startstop_t do_rw_taskfile (ide_driv if (task->tf_flags & IDE_TFLAG_FLAGGED) task->tf_flags |= IDE_TFLAG_FLAGGED_SET_IN_FLAGS; - ide_tf_load(drive, task); + if ((task->tf_flags & IDE_TFLAG_DMA_PIO_FALLBACK) == 0) + ide_tf_load(drive, task); switch (task->data_phase) { case TASKFILE_MULTI_OUT: @@ -208,6 +209,7 @@ ide_startstop_t do_rw_taskfile (ide_driv return ide_started; } } +EXPORT_SYMBOL_GPL(do_rw_taskfile); /* * set_multmode_intr() is invoked on completion of a WIN_SETMULT cmd. @@ -446,7 +448,7 @@ static void task_end_request(ide_drive_t /* * Handler for command with PIO data-in phase (Read/Read Multiple). */ -ide_startstop_t task_in_intr (ide_drive_t *drive) +static ide_startstop_t task_in_intr(ide_drive_t *drive) { ide_hwif_t *hwif = drive->hwif; struct request *rq = HWGROUP(drive)->rq; @@ -477,7 +479,6 @@ ide_startstop_t task_in_intr (ide_drive_ return ide_started; } -EXPORT_SYMBOL(task_in_intr); /* * Handler for command with PIO data-out phase (Write/Write Multiple). @@ -507,7 +508,7 @@ static ide_startstop_t task_out_intr (id return ide_started; } -ide_startstop_t pre_task_out_intr (ide_drive_t *drive, struct request *rq) +static ide_startstop_t pre_task_out_intr(ide_drive_t *drive, struct request *rq) { ide_startstop_t startstop; @@ -528,7 +529,6 @@ ide_startstop_t pre_task_out_intr (ide_d return ide_started; } -EXPORT_SYMBOL(pre_task_out_intr); int ide_raw_taskfile(ide_drive_t *drive, ide_task_t *task, u8 *buf, u16 nsect) { Index: b/include/linux/ide.h =================================================================== --- a/include/linux/ide.h +++ b/include/linux/ide.h @@ -919,6 +919,7 @@ enum { IDE_TFLAG_FLAGGED_SET_IN_FLAGS = (1 << 16), IDE_TFLAG_IN_DATA = (1 << 17), IDE_TFLAG_CUSTOM_HANDLER = (1 << 18), + IDE_TFLAG_DMA_PIO_FALLBACK = (1 << 19), }; struct ide_taskfile { @@ -972,13 +973,7 @@ extern int drive_is_ready(ide_drive_t *) void ide_pktcmd_tf_load(ide_drive_t *, u32, u16, u8); -/* - * taskfile io for disks for now...and builds request from ide_ioctl - */ -extern ide_startstop_t do_rw_taskfile(ide_drive_t *, ide_task_t *); - -extern ide_startstop_t task_in_intr(ide_drive_t *); -extern ide_startstop_t pre_task_out_intr(ide_drive_t *, struct request *); +ide_startstop_t do_rw_taskfile(ide_drive_t *, ide_task_t *); int ide_raw_taskfile(ide_drive_t *, ide_task_t *, u8 *, u16); int ide_no_data_taskfile(ide_drive_t *, ide_task_t *);