diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c index 29e71bddd6ffdd12420b4749eb88f79fb51ead26..3c06e457b4dc86929949e700292fd3149fff79fd 100644 --- a/drivers/ata/ahci.c +++ b/drivers/ata/ahci.c @@ -1975,16 +1975,11 @@ static int ahci_port_start(struct ata_port *ap) struct ahci_port_priv *pp; void *mem; dma_addr_t mem_dma; - int rc; pp = devm_kzalloc(dev, sizeof(*pp), GFP_KERNEL); if (!pp) return -ENOMEM; - rc = ata_pad_alloc(ap, dev); - if (rc) - return rc; - mem = dmam_alloc_coherent(dev, AHCI_PORT_PRIV_DMA_SZ, &mem_dma, GFP_KERNEL); if (!mem) diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c index a109ccbda9caec7ac7fbc3e9770e28850772c6eb..3587ac3fe3f394bb2e9113672f1d165876ce6a6a 100644 --- a/drivers/ata/libata-core.c +++ b/drivers/ata/libata-core.c @@ -4493,30 +4493,13 @@ void ata_sg_clean(struct ata_queued_cmd *qc) struct ata_port *ap = qc->ap; struct scatterlist *sg = qc->sg; int dir = qc->dma_dir; - void *pad_buf = NULL; WARN_ON(sg == NULL); - VPRINTK("unmapping %u sg elements\n", qc->mapped_n_elem); + VPRINTK("unmapping %u sg elements\n", qc->n_elem); - /* if we padded the buffer out to 32-bit bound, and data - * xfer direction is from-device, we must copy from the - * pad buffer back into the supplied buffer - */ - if (qc->pad_len && !(qc->tf.flags & ATA_TFLAG_WRITE)) - pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ); - - if (qc->mapped_n_elem) - dma_unmap_sg(ap->dev, sg, qc->mapped_n_elem, dir); - /* restore last sg */ - if (qc->last_sg) - *qc->last_sg = qc->saved_last_sg; - if (pad_buf) { - struct scatterlist *psg = &qc->extra_sg[1]; - void *addr = kmap_atomic(sg_page(psg), KM_IRQ0); - memcpy(addr + psg->offset, pad_buf, qc->pad_len); - kunmap_atomic(addr, KM_IRQ0); - } + if (qc->n_elem) + dma_unmap_sg(ap->dev, sg, qc->n_elem, dir); qc->flags &= ~ATA_QCFLAG_DMAMAP; qc->sg = NULL; @@ -4767,97 +4750,6 @@ void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg, qc->cursg = qc->sg; } -static unsigned int ata_sg_setup_extra(struct ata_queued_cmd *qc, - unsigned int *n_elem_extra, - unsigned int *nbytes_extra) -{ - struct ata_port *ap = qc->ap; - unsigned int n_elem = qc->n_elem; - struct scatterlist *lsg, *copy_lsg = NULL, *tsg = NULL, *esg = NULL; - - *n_elem_extra = 0; - *nbytes_extra = 0; - - /* needs padding? */ - qc->pad_len = qc->nbytes & 3; - - if (likely(!qc->pad_len)) - return n_elem; - - /* locate last sg and save it */ - lsg = sg_last(qc->sg, n_elem); - qc->last_sg = lsg; - qc->saved_last_sg = *lsg; - - sg_init_table(qc->extra_sg, ARRAY_SIZE(qc->extra_sg)); - - if (qc->pad_len) { - struct scatterlist *psg = &qc->extra_sg[1]; - void *pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ); - unsigned int offset; - - WARN_ON(qc->dev->class != ATA_DEV_ATAPI); - - memset(pad_buf, 0, ATA_DMA_PAD_SZ); - - /* psg->page/offset are used to copy to-be-written - * data in this function or read data in ata_sg_clean. - */ - offset = lsg->offset + lsg->length - qc->pad_len; - sg_set_page(psg, nth_page(sg_page(lsg), offset >> PAGE_SHIFT), - qc->pad_len, offset_in_page(offset)); - - if (qc->tf.flags & ATA_TFLAG_WRITE) { - void *addr = kmap_atomic(sg_page(psg), KM_IRQ0); - memcpy(pad_buf, addr + psg->offset, qc->pad_len); - kunmap_atomic(addr, KM_IRQ0); - } - - sg_dma_address(psg) = ap->pad_dma + (qc->tag * ATA_DMA_PAD_SZ); - sg_dma_len(psg) = ATA_DMA_PAD_SZ; - - /* Trim the last sg entry and chain the original and - * padding sg lists. - * - * Because chaining consumes one sg entry, one extra - * sg entry is allocated and the last sg entry is - * copied to it if the length isn't zero after padded - * amount is removed. - * - * If the last sg entry is completely replaced by - * padding sg entry, the first sg entry is skipped - * while chaining. - */ - lsg->length -= qc->pad_len; - if (lsg->length) { - copy_lsg = &qc->extra_sg[0]; - tsg = &qc->extra_sg[0]; - } else { - n_elem--; - tsg = &qc->extra_sg[1]; - } - - esg = &qc->extra_sg[1]; - - (*n_elem_extra)++; - (*nbytes_extra) += 4 - qc->pad_len; - } - - if (copy_lsg) - sg_set_page(copy_lsg, sg_page(lsg), lsg->length, lsg->offset); - - sg_chain(lsg, 1, tsg); - sg_mark_end(esg); - - /* sglist can't start with chaining sg entry, fast forward */ - if (qc->sg == lsg) { - qc->sg = tsg; - qc->cursg = tsg; - } - - return n_elem; -} - /** * ata_sg_setup - DMA-map the scatter-gather table associated with a command. * @qc: Command with scatter-gather table to be mapped. @@ -4874,26 +4766,17 @@ static unsigned int ata_sg_setup_extra(struct ata_queued_cmd *qc, static int ata_sg_setup(struct ata_queued_cmd *qc) { struct ata_port *ap = qc->ap; - unsigned int n_elem, n_elem_extra, nbytes_extra; + unsigned int n_elem; VPRINTK("ENTER, ata%u\n", ap->print_id); - n_elem = ata_sg_setup_extra(qc, &n_elem_extra, &nbytes_extra); + n_elem = dma_map_sg(ap->dev, qc->sg, qc->n_elem, qc->dma_dir); + if (n_elem < 1) + return -1; - if (n_elem) { - n_elem = dma_map_sg(ap->dev, qc->sg, n_elem, qc->dma_dir); - if (n_elem < 1) { - /* restore last sg */ - if (qc->last_sg) - *qc->last_sg = qc->saved_last_sg; - return -1; - } - DPRINTK("%d sg elements mapped\n", n_elem); - } + DPRINTK("%d sg elements mapped\n", n_elem); - qc->n_elem = qc->mapped_n_elem = n_elem; - qc->n_elem += n_elem_extra; - qc->nbytes += nbytes_extra; + qc->n_elem = n_elem; qc->flags |= ATA_QCFLAG_DMAMAP; return 0; @@ -5962,9 +5845,6 @@ void ata_qc_issue(struct ata_queued_cmd *qc) */ BUG_ON(ata_is_data(prot) && (!qc->sg || !qc->n_elem || !qc->nbytes)); - /* ata_sg_setup() may update nbytes */ - qc->raw_nbytes = qc->nbytes; - if (ata_is_dma(prot) || (ata_is_pio(prot) && (ap->flags & ATA_FLAG_PIO_DMA))) if (ata_sg_setup(qc)) @@ -6573,19 +6453,12 @@ void ata_host_resume(struct ata_host *host) int ata_port_start(struct ata_port *ap) { struct device *dev = ap->dev; - int rc; ap->prd = dmam_alloc_coherent(dev, ATA_PRD_TBL_SZ, &ap->prd_dma, GFP_KERNEL); if (!ap->prd) return -ENOMEM; - rc = ata_pad_alloc(ap, dev); - if (rc) - return rc; - - DPRINTK("prd alloc, virt %p, dma %llx\n", ap->prd, - (unsigned long long)ap->prd_dma); return 0; } diff --git a/drivers/ata/libata-scsi.c b/drivers/ata/libata-scsi.c index 1cea18f62abc927487e82815dfc645228ee57659..6e15c5ddae6d4796ea95ef0ca3f693f1abcf02b8 100644 --- a/drivers/ata/libata-scsi.c +++ b/drivers/ata/libata-scsi.c @@ -832,24 +832,16 @@ static void ata_scsi_dev_config(struct scsi_device *sdev, /* configure max sectors */ blk_queue_max_sectors(sdev->request_queue, dev->max_sectors); - /* SATA DMA transfers must be multiples of 4 byte, so - * we need to pad ATAPI transfers using an extra sg. - * Decrement max hw segments accordingly. - */ - if (dev->class == ATA_DEV_ATAPI) { - struct request_queue *q = sdev->request_queue; - blk_queue_max_hw_segments(q, q->max_hw_segments - 1); - + if (dev->class == ATA_DEV_ATAPI) /* set the min alignment */ blk_queue_update_dma_alignment(sdev->request_queue, ATA_DMA_PAD_SZ - 1); - } else + else { /* ATA devices must be sector aligned */ blk_queue_update_dma_alignment(sdev->request_queue, ATA_SECT_SIZE - 1); - - if (dev->class == ATA_DEV_ATA) sdev->manage_start_stop = 1; + } if (dev->flags & ATA_DFLAG_AN) set_bit(SDEV_EVT_MEDIA_CHANGE, sdev->supported_events); @@ -2500,7 +2492,7 @@ static unsigned int atapi_xlat(struct ata_queued_cmd *qc) * want to set it properly, and for DMA where it is * effectively meaningless. */ - nbytes = min(qc->nbytes, (unsigned int)63 * 1024); + nbytes = min(scmd->request->raw_data_len, (unsigned int)63 * 1024); /* Most ATAPI devices which honor transfer chunk size don't * behave according to the spec when odd chunk size which @@ -3555,7 +3547,7 @@ EXPORT_SYMBOL_GPL(ata_sas_port_alloc); * @ap: Port to initialize * * Called just after data structures for each port are - * initialized. Allocates DMA pad. + * initialized. * * May be used as the port_start() entry in ata_port_operations. * @@ -3564,7 +3556,7 @@ EXPORT_SYMBOL_GPL(ata_sas_port_alloc); */ int ata_sas_port_start(struct ata_port *ap) { - return ata_pad_alloc(ap, ap->dev); + return 0; } EXPORT_SYMBOL_GPL(ata_sas_port_start); @@ -3572,8 +3564,6 @@ EXPORT_SYMBOL_GPL(ata_sas_port_start); * ata_port_stop - Undo ata_sas_port_start() * @ap: Port to shut down * - * Frees the DMA pad. - * * May be used as the port_stop() entry in ata_port_operations. * * LOCKING: @@ -3582,7 +3572,6 @@ EXPORT_SYMBOL_GPL(ata_sas_port_start); void ata_sas_port_stop(struct ata_port *ap) { - ata_pad_free(ap, ap->dev); } EXPORT_SYMBOL_GPL(ata_sas_port_stop); diff --git a/drivers/ata/pata_icside.c b/drivers/ata/pata_icside.c index 5b8586dac63b155e974ab950292d501fc5fffcab..f97068be2d7971e915802126c52fff68f8618109 100644 --- a/drivers/ata/pata_icside.c +++ b/drivers/ata/pata_icside.c @@ -304,12 +304,6 @@ static int icside_dma_init(struct pata_icside_info *info) } -static int pata_icside_port_start(struct ata_port *ap) -{ - /* No PRD to alloc */ - return ata_pad_alloc(ap, ap->dev); -} - static struct scsi_host_template pata_icside_sht = { .module = THIS_MODULE, .name = DRV_NAME, @@ -389,8 +383,6 @@ static struct ata_port_operations pata_icside_port_ops = { .irq_clear = ata_dummy_noret, .irq_on = ata_irq_on, - .port_start = pata_icside_port_start, - .bmdma_stop = pata_icside_bmdma_stop, .bmdma_status = pata_icside_bmdma_status, }; diff --git a/drivers/ata/sata_fsl.c b/drivers/ata/sata_fsl.c index efcb66b6cceff96755b886a7aade98c642530e59..9323dd0c7d8deefdfa202379e3aeeef174e15e32 100644 --- a/drivers/ata/sata_fsl.c +++ b/drivers/ata/sata_fsl.c @@ -601,21 +601,9 @@ static int sata_fsl_port_start(struct ata_port *ap) if (!pp) return -ENOMEM; - /* - * allocate per command dma alignment pad buffer, which is used - * internally by libATA to ensure that all transfers ending on - * unaligned boundaries are padded, to align on Dword boundaries - */ - retval = ata_pad_alloc(ap, dev); - if (retval) { - kfree(pp); - return retval; - } - mem = dma_alloc_coherent(dev, SATA_FSL_PORT_PRIV_DMA_SZ, &mem_dma, GFP_KERNEL); if (!mem) { - ata_pad_free(ap, dev); kfree(pp); return -ENOMEM; } @@ -694,7 +682,6 @@ static void sata_fsl_port_stop(struct ata_port *ap) dma_free_coherent(dev, SATA_FSL_PORT_PRIV_DMA_SZ, pp->cmdslot, pp->cmdslot_paddr); - ata_pad_free(ap, dev); kfree(pp); } diff --git a/drivers/ata/sata_mv.c b/drivers/ata/sata_mv.c index 2ecd44db4142d639bb90fdb86872551d2705690c..1c1fbf375d9af979957913fe3acdff359adf5538 100644 --- a/drivers/ata/sata_mv.c +++ b/drivers/ata/sata_mv.c @@ -1158,17 +1158,13 @@ static int mv_port_start(struct ata_port *ap) struct mv_port_priv *pp; void __iomem *port_mmio = mv_ap_base(ap); unsigned long flags; - int tag, rc; + int tag; pp = devm_kzalloc(dev, sizeof(*pp), GFP_KERNEL); if (!pp) return -ENOMEM; ap->private_data = pp; - rc = ata_pad_alloc(ap, dev); - if (rc) - return rc; - pp->crqb = dma_pool_alloc(hpriv->crqb_pool, GFP_KERNEL, &pp->crqb_dma); if (!pp->crqb) return -ENOMEM; diff --git a/drivers/ata/sata_sil24.c b/drivers/ata/sata_sil24.c index b4b1f91ea693942f3292bcdbb885e11405c89376..df7988df79084fdca11ad228efd24f47caaf11c2 100644 --- a/drivers/ata/sata_sil24.c +++ b/drivers/ata/sata_sil24.c @@ -1234,7 +1234,6 @@ static int sil24_port_start(struct ata_port *ap) union sil24_cmd_block *cb; size_t cb_size = sizeof(*cb) * SIL24_MAX_CMDS; dma_addr_t cb_dma; - int rc; pp = devm_kzalloc(dev, sizeof(*pp), GFP_KERNEL); if (!pp) @@ -1247,10 +1246,6 @@ static int sil24_port_start(struct ata_port *ap) return -ENOMEM; memset(cb, 0, cb_size); - rc = ata_pad_alloc(ap, dev); - if (rc) - return rc; - pp->cmd_block = cb; pp->cmd_block_dma = cb_dma; diff --git a/drivers/scsi/ipr.c b/drivers/scsi/ipr.c index 2074701f7e7612959568535cfaec21bdc05b76b7..c72014a3e7d40ea16e8c02f10976162746c7d02a 100644 --- a/drivers/scsi/ipr.c +++ b/drivers/scsi/ipr.c @@ -5140,7 +5140,7 @@ static void ipr_build_ata_ioadl(struct ipr_cmnd *ipr_cmd, struct ipr_ioarcb *ioarcb = &ipr_cmd->ioarcb; struct ipr_ioadl_desc *ioadl = ipr_cmd->ioadl; struct ipr_ioadl_desc *last_ioadl = NULL; - int len = qc->nbytes + qc->pad_len; + int len = qc->nbytes; struct scatterlist *sg; unsigned int si; @@ -5206,7 +5206,7 @@ static unsigned int ipr_qc_issue(struct ata_queued_cmd *qc) ioarcb->cmd_pkt.request_type = IPR_RQTYPE_ATA_PASSTHRU; ioarcb->cmd_pkt.flags_hi |= IPR_FLAGS_HI_NO_LINK_DESC; ioarcb->cmd_pkt.flags_hi |= IPR_FLAGS_HI_NO_ULEN_CHK; - ipr_cmd->dma_use_sg = qc->pad_len ? qc->n_elem + 1 : qc->n_elem; + ipr_cmd->dma_use_sg = qc->n_elem; ipr_build_ata_ioadl(ipr_cmd, qc); regs->flags |= IPR_ATA_FLAG_STATUS_ON_GOOD_COMPLETION; diff --git a/drivers/scsi/libsas/sas_ata.c b/drivers/scsi/libsas/sas_ata.c index 0996f866f14c374bfa15ab69229af5cd14936d65..7cd05b599a12ca68348ccd721963e4afb7becede 100644 --- a/drivers/scsi/libsas/sas_ata.c +++ b/drivers/scsi/libsas/sas_ata.c @@ -178,8 +178,8 @@ static unsigned int sas_ata_qc_issue(struct ata_queued_cmd *qc) task->uldd_task = qc; if (ata_is_atapi(qc->tf.protocol)) { memcpy(task->ata_task.atapi_packet, qc->cdb, qc->dev->cdb_len); - task->total_xfer_len = qc->nbytes + qc->pad_len; - task->num_scatter = qc->pad_len ? qc->n_elem + 1 : qc->n_elem; + task->total_xfer_len = qc->nbytes; + task->num_scatter = qc->n_elem; } else { for_each_sg(qc->sg, sg, qc->n_elem, si) xfer += sg->length; diff --git a/include/linux/libata.h b/include/linux/libata.h index bc5a8d0c70902803fe63d4d6b3104e75bfa9c34e..2e098f940cec74083142d07a017522261b526c5e 100644 --- a/include/linux/libata.h +++ b/include/linux/libata.h @@ -278,7 +278,6 @@ enum { /* size of buffer to pad xfers ending on unaligned boundaries */ ATA_DMA_PAD_SZ = 4, - ATA_DMA_PAD_BUF_SZ = ATA_DMA_PAD_SZ * ATA_MAX_QUEUE, /* ering size */ ATA_ERING_SIZE = 32, @@ -457,24 +456,18 @@ struct ata_queued_cmd { unsigned long flags; /* ATA_QCFLAG_xxx */ unsigned int tag; unsigned int n_elem; - unsigned int mapped_n_elem; int dma_dir; - unsigned int pad_len; unsigned int sect_size; unsigned int nbytes; - unsigned int raw_nbytes; unsigned int curbytes; struct scatterlist *cursg; unsigned int cursg_ofs; - struct scatterlist *last_sg; - struct scatterlist saved_last_sg; struct scatterlist sgent; - struct scatterlist extra_sg[2]; struct scatterlist *sg; @@ -619,9 +612,6 @@ struct ata_port { struct ata_prd *prd; /* our SG list */ dma_addr_t prd_dma; /* and its DMA mapping */ - void *pad; /* array of DMA pad buffers */ - dma_addr_t pad_dma; - struct ata_ioports ioaddr; /* ATA cmd/ctl/dma register blocks */ u8 ctl; /* cache of ATA control register */ @@ -1363,12 +1353,9 @@ static inline void ata_qc_reinit(struct ata_queued_cmd *qc) qc->flags = 0; qc->cursg = NULL; qc->cursg_ofs = 0; - qc->nbytes = qc->raw_nbytes = qc->curbytes = 0; + qc->nbytes = qc->curbytes = 0; qc->n_elem = 0; - qc->mapped_n_elem = 0; qc->err_mask = 0; - qc->pad_len = 0; - qc->last_sg = NULL; qc->sect_size = ATA_SECT_SIZE; ata_tf_init(qc->dev, &qc->tf); @@ -1423,19 +1410,6 @@ static inline unsigned int __ac_err_mask(u8 status) return mask; } -static inline int ata_pad_alloc(struct ata_port *ap, struct device *dev) -{ - ap->pad_dma = 0; - ap->pad = dmam_alloc_coherent(dev, ATA_DMA_PAD_BUF_SZ, - &ap->pad_dma, GFP_KERNEL); - return (ap->pad == NULL) ? -ENOMEM : 0; -} - -static inline void ata_pad_free(struct ata_port *ap, struct device *dev) -{ - dmam_free_coherent(dev, ATA_DMA_PAD_BUF_SZ, ap->pad, ap->pad_dma); -} - static inline struct ata_port *ata_shost_to_port(struct Scsi_Host *host) { return *(struct ata_port **)&host->hostdata[0];