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SubjectRe: [PATCH 1/6] ide: pass command to ide_map_sg()
On Tue, Feb 10, 2009 at 12:19:52AM +0100, Bartlomiej Zolnierkiewicz wrote:
> From: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
> Subject: [PATCH] ide: pass command to ide_map_sg()
>
> * Set IDE_TFLAG_WRITE flag and ->rq also for ATA_CMD_PACKET
> commands.
>
> * Pass command to ->dma_setup method and update all its
> implementations accordingly.
>
> * Pass command instead of request to ide_build_sglist(),
> *_build_dmatable() and ide_map_sg().
>
> While at it:
>
> * Fix scc_dma_setup() documentation + use ATA_DMA_WR define.
>
> * Rename sgiioc4_build_dma_table() to sgiioc4_build_dmatable(),
> change return value type to 'int' and drop unused 'ddir'
> argument.
>
> * Do some minor cleanups in [tx4939]ide_dma_setup().
>
> There should be no functional changes caused by this patch.
>
> Cc: Borislav Petkov <petkovbb@gmail.com>
> Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
> ---
> drivers/ide/alim15x3.c | 7 ++++---
> drivers/ide/au1xxx-ide.c | 15 ++++++---------
> drivers/ide/icside.c | 7 +++----
> drivers/ide/ide-atapi.c | 16 ++++++++++++----
> drivers/ide/ide-disk.c | 10 +++++-----
> drivers/ide/ide-dma-sff.c | 18 +++++++++---------
> drivers/ide/ide-dma.c | 15 +++++++--------
> drivers/ide/ide-floppy.c | 6 +++++-
> drivers/ide/ide-io.c | 6 +++---
> drivers/ide/ide-taskfile.c | 4 ++--
> drivers/ide/ns87415.c | 4 ++--
> drivers/ide/pmac.c | 19 ++++++++-----------
> drivers/ide/scc_pata.c | 19 +++++++------------
> drivers/ide/sgiioc4.c | 21 +++++++--------------
> drivers/ide/trm290.c | 10 +++++-----
> drivers/ide/tx4939ide.c | 26 ++++++++++----------------
> include/linux/ide.h | 12 ++++++------
> 17 files changed, 101 insertions(+), 114 deletions(-)
>
> Index: b/drivers/ide/alim15x3.c
> ===================================================================
> --- a/drivers/ide/alim15x3.c
> +++ b/drivers/ide/alim15x3.c
> @@ -191,17 +191,18 @@ static void ali_set_dma_mode(ide_drive_t
> /**
> * ali15x3_dma_setup - begin a DMA phase
> * @drive: target device
> + * @cmd: command
> *
> * Returns 1 if the DMA cannot be performed, zero on success.
> */
>
> -static int ali15x3_dma_setup(ide_drive_t *drive)
> +static int ali15x3_dma_setup(ide_drive_t *drive, struct ide_cmd *cmd)
> {
> if (m5229_revision < 0xC2 && drive->media != ide_disk) {
> - if (rq_data_dir(drive->hwif->rq))
> + if (cmd->tf_flags & IDE_TFLAG_WRITE)
> return 1; /* try PIO instead of DMA */
> }
> - return ide_dma_setup(drive);
> + return ide_dma_setup(drive, cmd);
> }
>
> /**
> Index: b/drivers/ide/au1xxx-ide.c
> ===================================================================
> --- a/drivers/ide/au1xxx-ide.c
> +++ b/drivers/ide/au1xxx-ide.c
> @@ -209,15 +209,14 @@ static void auide_set_dma_mode(ide_drive
> */
>
> #ifdef CONFIG_BLK_DEV_IDE_AU1XXX_MDMA2_DBDMA
> -static int auide_build_dmatable(ide_drive_t *drive)
> +static int auide_build_dmatable(ide_drive_t *drive, struct ide_cmd *cmd)
> {
> ide_hwif_t *hwif = drive->hwif;
> - struct request *rq = hwif->rq;
> _auide_hwif *ahwif = &auide_hwif;
> struct scatterlist *sg;
> - int i = hwif->cmd.sg_nents, iswrite, count = 0;
> + int i = cmd->sg_nents, count = 0;
> + int iswrite = !!(cmd->tf_flags & IDE_TFLAG_WRITE);
>
> - iswrite = (rq_data_dir(rq) == WRITE);
> /* Save for interrupt context */
> ahwif->drive = drive;
>
> @@ -298,12 +297,10 @@ static void auide_dma_exec_cmd(ide_drive
> (2*WAIT_CMD), NULL);
> }
>
> -static int auide_dma_setup(ide_drive_t *drive)
> +static int auide_dma_setup(ide_drive_t *drive, struct ide_cmd *cmd)
> {
> - struct request *rq = drive->hwif->rq;
> -
> - if (!auide_build_dmatable(drive)) {
> - ide_map_sg(drive, rq);
> + if (auide_build_dmatable(drive, cmd) == 0) {
> + ide_map_sg(drive, cmd);
> return 1;
> }
>
> Index: b/drivers/ide/icside.c
> ===================================================================
> --- a/drivers/ide/icside.c
> +++ b/drivers/ide/icside.c
> @@ -307,15 +307,14 @@ static void icside_dma_start(ide_drive_t
> enable_dma(ec->dma);
> }
>
> -static int icside_dma_setup(ide_drive_t *drive)
> +static int icside_dma_setup(ide_drive_t *drive, struct ide_cmd *cmd)
> {
> ide_hwif_t *hwif = drive->hwif;
> struct expansion_card *ec = ECARD_DEV(hwif->dev);
> struct icside_state *state = ecard_get_drvdata(ec);
> - struct request *rq = hwif->rq;
> unsigned int dma_mode;
>
> - if (rq_data_dir(rq))
> + if (cmd->tf_flags & IDE_TFLAG_WRITE)
> dma_mode = DMA_MODE_WRITE;
> else
> dma_mode = DMA_MODE_READ;
> @@ -344,7 +343,7 @@ static int icside_dma_setup(ide_drive_t
> * Tell the DMA engine about the SG table and
> * data direction.
> */
> - set_dma_sg(ec->dma, hwif->sg_table, hwif->cmd.sg_nents);
> + set_dma_sg(ec->dma, hwif->sg_table, cmd->sg_nents);
> set_dma_mode(ec->dma, dma_mode);
>
> drive->waiting_for_dma = 1;
> Index: b/drivers/ide/ide-atapi.c
> ===================================================================
> --- a/drivers/ide/ide-atapi.c
> +++ b/drivers/ide/ide-atapi.c
> @@ -626,12 +626,20 @@ ide_startstop_t ide_issue_pc(ide_drive_t
> {
> struct ide_atapi_pc *pc;
> ide_hwif_t *hwif = drive->hwif;
> + const struct ide_dma_ops *dma_ops = hwif->dma_ops;
> + struct ide_cmd *cmd = &hwif->cmd;
> ide_expiry_t *expiry = NULL;
> struct request *rq = hwif->rq;
> unsigned int timeout;
> u32 tf_flags;
> u16 bcount;
>
> + if (drive->media != ide_floppy) {
> + if (rq_data_dir(rq))
> + cmd->tf_flags |= IDE_TFLAG_WRITE;
> + cmd->rq = rq;
> + }
> +
> if (dev_is_idecd(drive)) {
> tf_flags = IDE_TFLAG_OUT_NSECT | IDE_TFLAG_OUT_LBAL;
> bcount = ide_cd_get_xferlen(rq);
> @@ -639,8 +647,8 @@ ide_startstop_t ide_issue_pc(ide_drive_t
> timeout = ATAPI_WAIT_PC;
>
> if (drive->dma) {
> - if (ide_build_sglist(drive, rq))
> - drive->dma = !hwif->dma_ops->dma_setup(drive);
> + if (ide_build_sglist(drive, cmd))
> + drive->dma = !dma_ops->dma_setup(drive, cmd);
> else
> drive->dma = 0;
> }
> @@ -663,8 +671,8 @@ ide_startstop_t ide_issue_pc(ide_drive_t
>
> if ((pc->flags & PC_FLAG_DMA_OK) &&
> (drive->dev_flags & IDE_DFLAG_USING_DMA)) {
> - if (ide_build_sglist(drive, rq))
> - drive->dma = !hwif->dma_ops->dma_setup(drive);
> + if (ide_build_sglist(drive, cmd))
> + drive->dma = !dma_ops->dma_setup(drive, cmd);
> else
> drive->dma = 0;
> }
> Index: b/drivers/ide/ide-disk.c
> ===================================================================
> --- a/drivers/ide/ide-disk.c
> +++ b/drivers/ide/ide-disk.c
> @@ -99,11 +99,6 @@ static ide_startstop_t __ide_do_rw_disk(
> memset(&cmd, 0, sizeof(cmd));
> cmd.tf_flags = IDE_TFLAG_TF | IDE_TFLAG_DEVICE;
>
> - if (dma == 0) {
> - ide_init_sg_cmd(&cmd, nsectors);
> - ide_map_sg(drive, rq);
> - }
> -
> if (drive->dev_flags & IDE_DFLAG_LBA) {
> if (lba48) {
> pr_debug("%s: LBA=0x%012llx\n", drive->name,
> @@ -156,6 +151,11 @@ static ide_startstop_t __ide_do_rw_disk(
> ide_tf_set_cmd(drive, &cmd, dma);
> cmd.rq = rq;
>
> + if (dma == 0) {
> + ide_init_sg_cmd(&cmd, nsectors);
> + ide_map_sg(drive, &cmd);
> + }
> +
> rc = do_rw_taskfile(drive, &cmd);
>
> if (rc == ide_stopped && dma) {
> Index: b/drivers/ide/ide-dma-sff.c
> ===================================================================
> --- a/drivers/ide/ide-dma-sff.c
> +++ b/drivers/ide/ide-dma-sff.c
> @@ -111,7 +111,7 @@ EXPORT_SYMBOL_GPL(ide_dma_host_set);
> * May also be invoked from trm290.c
> */
>
> -int ide_build_dmatable(ide_drive_t *drive, struct request *rq)
> +int ide_build_dmatable(ide_drive_t *drive, struct ide_cmd *cmd)
> {
> ide_hwif_t *hwif = drive->hwif;
> __le32 *table = (__le32 *)hwif->dmatable_cpu;
> @@ -120,7 +120,7 @@ int ide_build_dmatable(ide_drive_t *driv
> struct scatterlist *sg;
> u8 is_trm290 = !!(hwif->host_flags & IDE_HFLAG_TRM290);
>
> - for_each_sg(hwif->sg_table, sg, hwif->cmd.sg_nents, i) {
> + for_each_sg(hwif->sg_table, sg, cmd->sg_nents, i) {
> u32 cur_addr, cur_len, xcount, bcount;
>
> cur_addr = sg_dma_address(sg);
> @@ -175,6 +175,7 @@ EXPORT_SYMBOL_GPL(ide_build_dmatable);
> /**
> * ide_dma_setup - begin a DMA phase
> * @drive: target device
> + * @cmd: command
> *
> * Build an IDE DMA PRD (IDE speak for scatter gather table)
> * and then set up the DMA transfer registers for a device
> @@ -185,17 +186,16 @@ EXPORT_SYMBOL_GPL(ide_build_dmatable);
> * is returned.
> */
>
> -int ide_dma_setup(ide_drive_t *drive)
> +int ide_dma_setup(ide_drive_t *drive, struct ide_cmd *cmd)
> {
> ide_hwif_t *hwif = drive->hwif;
> - struct request *rq = hwif->rq;
> - unsigned int reading = rq_data_dir(rq) ? 0 : ATA_DMA_WR;
> u8 mmio = (hwif->host_flags & IDE_HFLAG_MMIO) ? 1 : 0;
> + u8 rw = (cmd->tf_flags & IDE_TFLAG_WRITE) ? 0 : ATA_DMA_WR;
> u8 dma_stat;
>
> /* fall back to pio! */
> - if (!ide_build_dmatable(drive, rq)) {
> - ide_map_sg(drive, rq);
> + if (ide_build_dmatable(drive, cmd) == 0) {
> + ide_map_sg(drive, cmd);
> return 1;
> }
>
> @@ -208,9 +208,9 @@ int ide_dma_setup(ide_drive_t *drive)
>
> /* specify r/w */
> if (mmio)
> - writeb(reading, (void __iomem *)(hwif->dma_base + ATA_DMA_CMD));
> + writeb(rw, (void __iomem *)(hwif->dma_base + ATA_DMA_CMD));
> else
> - outb(reading, hwif->dma_base + ATA_DMA_CMD);
> + outb(rw, hwif->dma_base + ATA_DMA_CMD);
>
> /* read DMA status for INTR & ERROR flags */
> dma_stat = hwif->dma_ops->dma_sff_read_status(hwif);
> Index: b/drivers/ide/ide-dma.c
> ===================================================================
> --- a/drivers/ide/ide-dma.c
> +++ b/drivers/ide/ide-dma.c
> @@ -120,7 +120,7 @@ int ide_dma_good_drive(ide_drive_t *driv
> /**
> * ide_build_sglist - map IDE scatter gather for DMA I/O
> * @drive: the drive to build the DMA table for
> - * @rq: the request holding the sg list
> + * @cmd: command
> *
> * Perform the DMA mapping magic necessary to access the source or
> * target buffers of a request via DMA. The lower layers of the
> @@ -128,23 +128,22 @@ int ide_dma_good_drive(ide_drive_t *driv
> * operate in a portable fashion.
> */
>
> -int ide_build_sglist(ide_drive_t *drive, struct request *rq)
> +int ide_build_sglist(ide_drive_t *drive, struct ide_cmd *cmd)
> {
> ide_hwif_t *hwif = drive->hwif;
> struct scatterlist *sg = hwif->sg_table;
> - struct ide_cmd *cmd = &hwif->cmd;
> int i;
>
> - ide_map_sg(drive, rq);
> + ide_map_sg(drive, cmd);
>
> - if (rq_data_dir(rq) == READ)
> - cmd->sg_dma_direction = DMA_FROM_DEVICE;
> - else
> + if (cmd->tf_flags & IDE_TFLAG_WRITE)
> cmd->sg_dma_direction = DMA_TO_DEVICE;
> + else
> + cmd->sg_dma_direction = DMA_FROM_DEVICE;
>
> i = dma_map_sg(hwif->dev, sg, cmd->sg_nents, cmd->sg_dma_direction);
> if (i == 0)
> - ide_map_sg(drive, rq);
> + ide_map_sg(drive, cmd);
>
> return i;
> }
> Index: b/drivers/ide/ide-floppy.c
> ===================================================================
> --- a/drivers/ide/ide-floppy.c
> +++ b/drivers/ide/ide-floppy.c
> @@ -285,8 +285,12 @@ static ide_startstop_t ide_floppy_do_req
> goto out_end;
> }
>
> + if (rq_data_dir(rq))
> + cmd->tf_flags |= IDE_TFLAG_WRITE;
> + cmd->rq = rq;
> +
> ide_init_sg_cmd(cmd, rq->nr_sectors);
> - ide_map_sg(drive, rq);
> + ide_map_sg(drive, cmd);

How about we push those mappings in ide_issue_pc() in the else-branch
after we've tried setting up dma and we've failed? This way we don't
have to do that in the ->do_request of every device and do it for all at
one place instead. Only ide-cd will have to have ->ide_io_buffers for
PIO transfers (which I was working on before bugs :))

[..]

--
Regards/Gruss,
Boris.


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