From f6b6ec532fec4c62791e878923aa11d1cc2261eb Mon Sep 17 00:00:00 2001 From: Jeff Garzik Date: Sun, 9 Oct 2005 11:16:14 -0400 Subject: [PATCH] --- yaml --- r: 9709 b: refs/heads/master c: c4052da6f0c01a0b059d125d72bb934d0980b798 h: refs/heads/master i: 9707: 568718b8e811e77020d7af0ce0158851559be728 v: v3 --- [refs] | 2 +- trunk/drivers/scsi/ahci.c | 30 +++++--- trunk/drivers/scsi/libata-core.c | 123 ++++++++++++++++++++++++++----- trunk/drivers/scsi/libata-scsi.c | 14 +++- trunk/drivers/scsi/sata_qstor.c | 8 +- trunk/drivers/scsi/sata_sx4.c | 13 ++-- trunk/include/linux/libata.h | 27 ++++++- 7 files changed, 175 insertions(+), 42 deletions(-) diff --git a/[refs] b/[refs] index ae0d28d5ffc7..4ed297d73d7f 100644 --- a/[refs] +++ b/[refs] @@ -1,2 +1,2 @@ --- -refs/heads/master: 3d3467f0fdf61a421361c00cf84fcf0f1a6dc1e8 +refs/heads/master: c4052da6f0c01a0b059d125d72bb934d0980b798 diff --git a/trunk/drivers/scsi/ahci.c b/trunk/drivers/scsi/ahci.c index 5ec866b00479..f0d8f89b5d40 100644 --- a/trunk/drivers/scsi/ahci.c +++ b/trunk/drivers/scsi/ahci.c @@ -314,8 +314,15 @@ static int ahci_port_start(struct ata_port *ap) return -ENOMEM; memset(pp, 0, sizeof(*pp)); + ap->pad = dma_alloc_coherent(dev, ATA_DMA_PAD_BUF_SZ, &ap->pad_dma, GFP_KERNEL); + if (!ap->pad) { + kfree(pp); + return -ENOMEM; + } + mem = dma_alloc_coherent(dev, AHCI_PORT_PRIV_DMA_SZ, &mem_dma, GFP_KERNEL); if (!mem) { + dma_free_coherent(dev, ATA_DMA_PAD_BUF_SZ, ap->pad, ap->pad_dma); kfree(pp); return -ENOMEM; } @@ -391,6 +398,7 @@ static void ahci_port_stop(struct ata_port *ap) ap->private_data = NULL; dma_free_coherent(dev, AHCI_PORT_PRIV_DMA_SZ, pp->cmd_slot, pp->cmd_slot_dma); + dma_free_coherent(dev, ATA_DMA_PAD_BUF_SZ, ap->pad, ap->pad_dma); kfree(pp); } @@ -476,23 +484,23 @@ static void ahci_tf_read(struct ata_port *ap, struct ata_taskfile *tf) static void ahci_fill_sg(struct ata_queued_cmd *qc) { struct ahci_port_priv *pp = qc->ap->private_data; - unsigned int i; + struct scatterlist *sg; + struct ahci_sg *ahci_sg; VPRINTK("ENTER\n"); /* * Next, the S/G list. */ - for (i = 0; i < qc->n_elem; i++) { - u32 sg_len; - dma_addr_t addr; - - addr = sg_dma_address(&qc->sg[i]); - sg_len = sg_dma_len(&qc->sg[i]); - - pp->cmd_tbl_sg[i].addr = cpu_to_le32(addr & 0xffffffff); - pp->cmd_tbl_sg[i].addr_hi = cpu_to_le32((addr >> 16) >> 16); - pp->cmd_tbl_sg[i].flags_size = cpu_to_le32(sg_len - 1); + ahci_sg = pp->cmd_tbl_sg; + ata_for_each_sg(sg, qc) { + dma_addr_t addr = sg_dma_address(sg); + u32 sg_len = sg_dma_len(sg); + + ahci_sg->addr = cpu_to_le32(addr & 0xffffffff); + ahci_sg->addr_hi = cpu_to_le32((addr >> 16) >> 16); + ahci_sg->flags_size = cpu_to_le32(sg_len - 1); + ahci_sg++; } } diff --git a/trunk/drivers/scsi/libata-core.c b/trunk/drivers/scsi/libata-core.c index d568914c4344..9aa93087d495 100644 --- a/trunk/drivers/scsi/libata-core.c +++ b/trunk/drivers/scsi/libata-core.c @@ -2242,8 +2242,9 @@ static void ata_dev_init_params(struct ata_port *ap, struct ata_device *dev) static void ata_sg_clean(struct ata_queued_cmd *qc) { struct ata_port *ap = qc->ap; - struct scatterlist *sg = qc->sg; + struct scatterlist *sg = qc->__sg; int dir = qc->dma_dir; + void *pad_buf = NULL; assert(qc->flags & ATA_QCFLAG_DMAMAP); assert(sg != NULL); @@ -2253,14 +2254,35 @@ static void ata_sg_clean(struct ata_queued_cmd *qc) DPRINTK("unmapping %u sg elements\n", qc->n_elem); - if (qc->flags & ATA_QCFLAG_SG) + /* 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->flags & ATA_QCFLAG_SG) { dma_unmap_sg(ap->host_set->dev, sg, qc->n_elem, dir); - else + /* restore last sg */ + sg[qc->orig_n_elem - 1].length += qc->pad_len; + if (pad_buf) { + struct scatterlist *psg = &qc->pad_sgent; + void *addr = kmap_atomic(psg->page, KM_IRQ0); + memcpy(addr + psg->offset, pad_buf, qc->pad_len); + kunmap_atomic(psg->page, KM_IRQ0); + } + } else { dma_unmap_single(ap->host_set->dev, sg_dma_address(&sg[0]), sg_dma_len(&sg[0]), dir); + /* restore sg */ + sg->length += qc->pad_len; + if (pad_buf) + memcpy(qc->buf_virt + sg->length - qc->pad_len, + pad_buf, qc->pad_len); + } qc->flags &= ~ATA_QCFLAG_DMAMAP; - qc->sg = NULL; + qc->__sg = NULL; } /** @@ -2276,15 +2298,15 @@ static void ata_sg_clean(struct ata_queued_cmd *qc) */ static void ata_fill_sg(struct ata_queued_cmd *qc) { - struct scatterlist *sg = qc->sg; struct ata_port *ap = qc->ap; - unsigned int idx, nelem; + struct scatterlist *sg; + unsigned int idx; - assert(sg != NULL); + assert(qc->__sg != NULL); assert(qc->n_elem > 0); idx = 0; - for (nelem = qc->n_elem; nelem; nelem--,sg++) { + ata_for_each_sg(sg, qc) { u32 addr, offset; u32 sg_len, len; @@ -2375,11 +2397,12 @@ void ata_sg_init_one(struct ata_queued_cmd *qc, void *buf, unsigned int buflen) qc->flags |= ATA_QCFLAG_SINGLE; memset(&qc->sgent, 0, sizeof(qc->sgent)); - qc->sg = &qc->sgent; + qc->__sg = &qc->sgent; qc->n_elem = 1; + qc->orig_n_elem = 1; qc->buf_virt = buf; - sg = qc->sg; + sg = qc->__sg; sg->page = virt_to_page(buf); sg->offset = (unsigned long) buf & ~PAGE_MASK; sg->length = buflen; @@ -2403,8 +2426,9 @@ void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg, unsigned int n_elem) { qc->flags |= ATA_QCFLAG_SG; - qc->sg = sg; + qc->__sg = sg; qc->n_elem = n_elem; + qc->orig_n_elem = n_elem; } /** @@ -2424,9 +2448,32 @@ static int ata_sg_setup_one(struct ata_queued_cmd *qc) { struct ata_port *ap = qc->ap; int dir = qc->dma_dir; - struct scatterlist *sg = qc->sg; + struct scatterlist *sg = qc->__sg; dma_addr_t dma_address; + /* we must lengthen transfers to end on a 32-bit boundary */ + qc->pad_len = sg->length & 3; + if (qc->pad_len) { + void *pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ); + struct scatterlist *psg = &qc->pad_sgent; + + assert(qc->dev->class == ATA_DEV_ATAPI); + + memset(pad_buf, 0, ATA_DMA_PAD_SZ); + + if (qc->tf.flags & ATA_TFLAG_WRITE) + memcpy(pad_buf, qc->buf_virt + sg->length - qc->pad_len, + qc->pad_len); + + sg_dma_address(psg) = ap->pad_dma + (qc->tag * ATA_DMA_PAD_SZ); + sg_dma_len(psg) = ATA_DMA_PAD_SZ; + /* trim sg */ + sg->length -= qc->pad_len; + + DPRINTK("padding done, sg->length=%u pad_len=%u\n", + sg->length, qc->pad_len); + } + dma_address = dma_map_single(ap->host_set->dev, qc->buf_virt, sg->length, dir); if (dma_mapping_error(dma_address)) @@ -2458,12 +2505,47 @@ static int ata_sg_setup_one(struct ata_queued_cmd *qc) static int ata_sg_setup(struct ata_queued_cmd *qc) { struct ata_port *ap = qc->ap; - struct scatterlist *sg = qc->sg; + struct scatterlist *sg = qc->__sg; + struct scatterlist *lsg = &sg[qc->n_elem - 1]; int n_elem, dir; VPRINTK("ENTER, ata%u\n", ap->id); assert(qc->flags & ATA_QCFLAG_SG); + /* we must lengthen transfers to end on a 32-bit boundary */ + qc->pad_len = lsg->length & 3; + if (qc->pad_len) { + void *pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ); + struct scatterlist *psg = &qc->pad_sgent; + unsigned int offset; + + assert(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; + psg->page = nth_page(lsg->page, offset >> PAGE_SHIFT); + psg->offset = offset_in_page(offset); + + if (qc->tf.flags & ATA_TFLAG_WRITE) { + void *addr = kmap_atomic(psg->page, KM_IRQ0); + memcpy(pad_buf, addr + psg->offset, qc->pad_len); + kunmap_atomic(psg->page, KM_IRQ0); + } + + sg_dma_address(psg) = ap->pad_dma + (qc->tag * ATA_DMA_PAD_SZ); + sg_dma_len(psg) = ATA_DMA_PAD_SZ; + /* trim last sg */ + lsg->length -= qc->pad_len; + + DPRINTK("padding done, sg[%d].length=%u pad_len=%u\n", + qc->n_elem - 1, lsg->length, qc->pad_len); + } + dir = qc->dma_dir; n_elem = dma_map_sg(ap->host_set->dev, sg, qc->n_elem, dir); if (n_elem < 1) @@ -2741,7 +2823,7 @@ static void ata_data_xfer(struct ata_port *ap, unsigned char *buf, static void ata_pio_sector(struct ata_queued_cmd *qc) { int do_write = (qc->tf.flags & ATA_TFLAG_WRITE); - struct scatterlist *sg = qc->sg; + struct scatterlist *sg = qc->__sg; struct ata_port *ap = qc->ap; struct page *page; unsigned int offset; @@ -2791,7 +2873,7 @@ static void ata_pio_sector(struct ata_queued_cmd *qc) static void __atapi_pio_bytes(struct ata_queued_cmd *qc, unsigned int bytes) { int do_write = (qc->tf.flags & ATA_TFLAG_WRITE); - struct scatterlist *sg = qc->sg; + struct scatterlist *sg = qc->__sg; struct ata_port *ap = qc->ap; struct page *page; unsigned char *buf; @@ -2824,7 +2906,7 @@ static void __atapi_pio_bytes(struct ata_queued_cmd *qc, unsigned int bytes) return; } - sg = &qc->sg[qc->cursg]; + sg = &qc->__sg[qc->cursg]; page = sg->page; offset = sg->offset + qc->cursg_ofs; @@ -3185,7 +3267,7 @@ struct ata_queued_cmd *ata_qc_new_init(struct ata_port *ap, qc = ata_qc_new(ap); if (qc) { - qc->sg = NULL; + qc->__sg = NULL; qc->flags = 0; qc->scsicmd = NULL; qc->ap = ap; @@ -3881,6 +3963,12 @@ int ata_port_start (struct ata_port *ap) if (!ap->prd) return -ENOMEM; + ap->pad = dma_alloc_coherent(dev, ATA_DMA_PAD_BUF_SZ, &ap->pad_dma, GFP_KERNEL); + if (!ap->pad) { + dma_free_coherent(dev, ATA_PRD_TBL_SZ, ap->prd, ap->prd_dma); + return -ENOMEM; + } + DPRINTK("prd alloc, virt %p, dma %llx\n", ap->prd, (unsigned long long) ap->prd_dma); return 0; @@ -3903,6 +3991,7 @@ void ata_port_stop (struct ata_port *ap) struct device *dev = ap->host_set->dev; dma_free_coherent(dev, ATA_PRD_TBL_SZ, ap->prd, ap->prd_dma); + dma_free_coherent(dev, ATA_DMA_PAD_BUF_SZ, ap->pad, ap->pad_dma); } void ata_host_stop (struct ata_host_set *host_set) diff --git a/trunk/drivers/scsi/libata-scsi.c b/trunk/drivers/scsi/libata-scsi.c index c64169ca7ff0..4cf43de4060e 100644 --- a/trunk/drivers/scsi/libata-scsi.c +++ b/trunk/drivers/scsi/libata-scsi.c @@ -158,10 +158,10 @@ struct ata_queued_cmd *ata_scsi_qc_new(struct ata_port *ap, qc->scsidone = done; if (cmd->use_sg) { - qc->sg = (struct scatterlist *) cmd->request_buffer; + qc->__sg = (struct scatterlist *) cmd->request_buffer; qc->n_elem = cmd->use_sg; } else { - qc->sg = &qc->sgent; + qc->__sg = &qc->sgent; qc->n_elem = 1; } } else { @@ -362,6 +362,16 @@ int ata_scsi_slave_config(struct scsi_device *sdev) */ blk_queue_max_sectors(sdev->request_queue, 2048); } + + /* + * 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) { + request_queue_t *q = sdev->request_queue; + blk_queue_max_hw_segments(q, q->max_hw_segments - 1); + } } return 0; /* scsi layer doesn't check return value, sigh */ diff --git a/trunk/drivers/scsi/sata_qstor.c b/trunk/drivers/scsi/sata_qstor.c index ffcdeb68641c..69a9b1cf6f9c 100644 --- a/trunk/drivers/scsi/sata_qstor.c +++ b/trunk/drivers/scsi/sata_qstor.c @@ -268,16 +268,17 @@ static void qs_scr_write (struct ata_port *ap, unsigned int sc_reg, u32 val) static void qs_fill_sg(struct ata_queued_cmd *qc) { - struct scatterlist *sg = qc->sg; + struct scatterlist *sg; struct ata_port *ap = qc->ap; struct qs_port_priv *pp = ap->private_data; unsigned int nelem; u8 *prd = pp->pkt + QS_CPB_BYTES; - assert(sg != NULL); + assert(qc->__sg != NULL); assert(qc->n_elem > 0); - for (nelem = 0; nelem < qc->n_elem; nelem++,sg++) { + nelem = 0; + ata_for_each_sg(sg, qc) { u64 addr; u32 len; @@ -291,6 +292,7 @@ static void qs_fill_sg(struct ata_queued_cmd *qc) VPRINTK("PRD[%u] = (0x%llX, 0x%X)\n", nelem, (unsigned long long)addr, len); + nelem++; } } diff --git a/trunk/drivers/scsi/sata_sx4.c b/trunk/drivers/scsi/sata_sx4.c index 540a85191172..79fdbbab513e 100644 --- a/trunk/drivers/scsi/sata_sx4.c +++ b/trunk/drivers/scsi/sata_sx4.c @@ -449,14 +449,14 @@ static inline void pdc20621_host_pkt(struct ata_taskfile *tf, u8 *buf, static void pdc20621_dma_prep(struct ata_queued_cmd *qc) { - struct scatterlist *sg = qc->sg; + struct scatterlist *sg; struct ata_port *ap = qc->ap; struct pdc_port_priv *pp = ap->private_data; void __iomem *mmio = ap->host_set->mmio_base; struct pdc_host_priv *hpriv = ap->host_set->private_data; void __iomem *dimm_mmio = hpriv->dimm_mmio; unsigned int portno = ap->port_no; - unsigned int i, last, idx, total_len = 0, sgt_len; + unsigned int i, idx, total_len = 0, sgt_len; u32 *buf = (u32 *) &pp->dimm_buf[PDC_DIMM_HEADER_SZ]; assert(qc->flags & ATA_QCFLAG_DMAMAP); @@ -469,12 +469,11 @@ static void pdc20621_dma_prep(struct ata_queued_cmd *qc) /* * Build S/G table */ - last = qc->n_elem; idx = 0; - for (i = 0; i < last; i++) { - buf[idx++] = cpu_to_le32(sg_dma_address(&sg[i])); - buf[idx++] = cpu_to_le32(sg_dma_len(&sg[i])); - total_len += sg_dma_len(&sg[i]); + ata_for_each_sg(sg, qc) { + buf[idx++] = cpu_to_le32(sg_dma_address(sg)); + buf[idx++] = cpu_to_le32(sg_dma_len(sg)); + total_len += sg_dma_len(sg); } buf[idx - 1] |= cpu_to_le32(ATA_PRD_EOT); sgt_len = idx * 4; diff --git a/trunk/include/linux/libata.h b/trunk/include/linux/libata.h index 7929cfc9318d..0f89f4121fa3 100644 --- a/trunk/include/linux/libata.h +++ b/trunk/include/linux/libata.h @@ -155,6 +155,10 @@ enum { ATA_SHIFT_UDMA = 0, ATA_SHIFT_MWDMA = 8, ATA_SHIFT_PIO = 11, + + /* 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, /* Masks for port functions */ ATA_PORT_PRIMARY = (1 << 0), @@ -242,9 +246,12 @@ struct ata_queued_cmd { unsigned long flags; /* ATA_QCFLAG_xxx */ unsigned int tag; unsigned int n_elem; + unsigned int orig_n_elem; int dma_dir; + unsigned int pad_len; + unsigned int nsect; unsigned int cursect; @@ -255,9 +262,11 @@ struct ata_queued_cmd { unsigned int cursg_ofs; struct scatterlist sgent; + struct scatterlist pad_sgent; void *buf_virt; - struct scatterlist *sg; + /* DO NOT iterate over __sg manually, use ata_for_each_sg() */ + struct scatterlist *__sg; ata_qc_cb_t complete_fn; @@ -305,6 +314,9 @@ 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 */ @@ -470,6 +482,19 @@ extern int pci_test_config_bits(struct pci_dev *pdev, struct pci_bits *bits); #endif /* CONFIG_PCI */ +static inline struct scatterlist * +ata_qc_next_sg(struct scatterlist *sg, struct ata_queued_cmd *qc) +{ + if (sg == &qc->pad_sgent) + return NULL; + if (++sg - qc->__sg < qc->n_elem) + return sg; + return qc->pad_len ? &qc->pad_sgent : NULL; +} + +#define ata_for_each_sg(sg, qc) \ + for (sg = qc->__sg; sg; sg = ata_qc_next_sg(sg, qc)) + static inline unsigned int ata_tag_valid(unsigned int tag) { return (tag < ATA_MAX_QUEUE) ? 1 : 0;