mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-24 13:31:02 +07:00
libata: fix ATAPI DMA alignment issues
ATAPI needs to be padded to next 4 byte boundary, if misaligned. Original work by me, many fixes from Tejun Heo.
This commit is contained in:
Jeff Garzik
parent
ed39f731ab
commit
cedc9a478d
@ -314,8 +314,15 @@ static int ahci_port_start(struct ata_port *ap)
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return -ENOMEM;
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memset(pp, 0, sizeof(*pp));
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ap->pad = dma_alloc_coherent(dev, ATA_DMA_PAD_BUF_SZ, &ap->pad_dma, GFP_KERNEL);
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if (!ap->pad) {
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kfree(pp);
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return -ENOMEM;
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}
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mem = dma_alloc_coherent(dev, AHCI_PORT_PRIV_DMA_SZ, &mem_dma, GFP_KERNEL);
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if (!mem) {
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dma_free_coherent(dev, ATA_DMA_PAD_BUF_SZ, ap->pad, ap->pad_dma);
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kfree(pp);
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return -ENOMEM;
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}
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@ -391,6 +398,7 @@ static void ahci_port_stop(struct ata_port *ap)
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ap->private_data = NULL;
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dma_free_coherent(dev, AHCI_PORT_PRIV_DMA_SZ,
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pp->cmd_slot, pp->cmd_slot_dma);
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dma_free_coherent(dev, ATA_DMA_PAD_BUF_SZ, ap->pad, ap->pad_dma);
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kfree(pp);
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}
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@ -476,23 +484,23 @@ static void ahci_tf_read(struct ata_port *ap, struct ata_taskfile *tf)
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static void ahci_fill_sg(struct ata_queued_cmd *qc)
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{
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struct ahci_port_priv *pp = qc->ap->private_data;
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unsigned int i;
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struct scatterlist *sg;
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struct ahci_sg *ahci_sg;
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VPRINTK("ENTER\n");
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/*
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* Next, the S/G list.
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*/
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for (i = 0; i < qc->n_elem; i++) {
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u32 sg_len;
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dma_addr_t addr;
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ahci_sg = pp->cmd_tbl_sg;
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ata_for_each_sg(sg, qc) {
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dma_addr_t addr = sg_dma_address(sg);
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u32 sg_len = sg_dma_len(sg);
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addr = sg_dma_address(&qc->sg[i]);
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sg_len = sg_dma_len(&qc->sg[i]);
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pp->cmd_tbl_sg[i].addr = cpu_to_le32(addr & 0xffffffff);
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pp->cmd_tbl_sg[i].addr_hi = cpu_to_le32((addr >> 16) >> 16);
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pp->cmd_tbl_sg[i].flags_size = cpu_to_le32(sg_len - 1);
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ahci_sg->addr = cpu_to_le32(addr & 0xffffffff);
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ahci_sg->addr_hi = cpu_to_le32((addr >> 16) >> 16);
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ahci_sg->flags_size = cpu_to_le32(sg_len - 1);
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ahci_sg++;
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}
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}
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@ -2156,8 +2156,9 @@ static void ata_dev_set_xfermode(struct ata_port *ap, struct ata_device *dev)
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static void ata_sg_clean(struct ata_queued_cmd *qc)
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{
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struct ata_port *ap = qc->ap;
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struct scatterlist *sg = qc->sg;
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struct scatterlist *sg = qc->__sg;
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int dir = qc->dma_dir;
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void *pad_buf = NULL;
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assert(qc->flags & ATA_QCFLAG_DMAMAP);
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assert(sg != NULL);
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@ -2167,14 +2168,35 @@ static void ata_sg_clean(struct ata_queued_cmd *qc)
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DPRINTK("unmapping %u sg elements\n", qc->n_elem);
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if (qc->flags & ATA_QCFLAG_SG)
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/* if we padded the buffer out to 32-bit bound, and data
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* xfer direction is from-device, we must copy from the
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* pad buffer back into the supplied buffer
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*/
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if (qc->pad_len && !(qc->tf.flags & ATA_TFLAG_WRITE))
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pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
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if (qc->flags & ATA_QCFLAG_SG) {
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dma_unmap_sg(ap->host_set->dev, sg, qc->n_elem, dir);
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else
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/* restore last sg */
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sg[qc->orig_n_elem - 1].length += qc->pad_len;
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if (pad_buf) {
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struct scatterlist *psg = &qc->pad_sgent;
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void *addr = kmap_atomic(psg->page, KM_IRQ0);
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memcpy(addr + psg->offset, pad_buf, qc->pad_len);
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kunmap_atomic(psg->page, KM_IRQ0);
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}
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} else {
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dma_unmap_single(ap->host_set->dev, sg_dma_address(&sg[0]),
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sg_dma_len(&sg[0]), dir);
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/* restore sg */
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sg->length += qc->pad_len;
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if (pad_buf)
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memcpy(qc->buf_virt + sg->length - qc->pad_len,
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pad_buf, qc->pad_len);
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}
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qc->flags &= ~ATA_QCFLAG_DMAMAP;
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qc->sg = NULL;
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qc->__sg = NULL;
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}
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/**
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@ -2190,15 +2212,15 @@ static void ata_sg_clean(struct ata_queued_cmd *qc)
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*/
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static void ata_fill_sg(struct ata_queued_cmd *qc)
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{
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struct scatterlist *sg = qc->sg;
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struct ata_port *ap = qc->ap;
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unsigned int idx, nelem;
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struct scatterlist *sg;
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unsigned int idx;
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assert(sg != NULL);
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assert(qc->__sg != NULL);
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assert(qc->n_elem > 0);
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idx = 0;
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for (nelem = qc->n_elem; nelem; nelem--,sg++) {
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ata_for_each_sg(sg, qc) {
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u32 addr, offset;
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u32 sg_len, len;
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@ -2289,11 +2311,12 @@ void ata_sg_init_one(struct ata_queued_cmd *qc, void *buf, unsigned int buflen)
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qc->flags |= ATA_QCFLAG_SINGLE;
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memset(&qc->sgent, 0, sizeof(qc->sgent));
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qc->sg = &qc->sgent;
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qc->__sg = &qc->sgent;
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qc->n_elem = 1;
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qc->orig_n_elem = 1;
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qc->buf_virt = buf;
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sg = qc->sg;
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sg = qc->__sg;
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sg->page = virt_to_page(buf);
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sg->offset = (unsigned long) buf & ~PAGE_MASK;
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sg->length = buflen;
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@ -2317,8 +2340,9 @@ void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg,
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unsigned int n_elem)
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{
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qc->flags |= ATA_QCFLAG_SG;
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qc->sg = sg;
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qc->__sg = sg;
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qc->n_elem = n_elem;
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qc->orig_n_elem = n_elem;
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}
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/**
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@ -2338,9 +2362,32 @@ static int ata_sg_setup_one(struct ata_queued_cmd *qc)
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{
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struct ata_port *ap = qc->ap;
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int dir = qc->dma_dir;
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struct scatterlist *sg = qc->sg;
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struct scatterlist *sg = qc->__sg;
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dma_addr_t dma_address;
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/* we must lengthen transfers to end on a 32-bit boundary */
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qc->pad_len = sg->length & 3;
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if (qc->pad_len) {
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void *pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
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struct scatterlist *psg = &qc->pad_sgent;
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assert(qc->dev->class == ATA_DEV_ATAPI);
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memset(pad_buf, 0, ATA_DMA_PAD_SZ);
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if (qc->tf.flags & ATA_TFLAG_WRITE)
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memcpy(pad_buf, qc->buf_virt + sg->length - qc->pad_len,
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qc->pad_len);
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sg_dma_address(psg) = ap->pad_dma + (qc->tag * ATA_DMA_PAD_SZ);
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sg_dma_len(psg) = ATA_DMA_PAD_SZ;
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/* trim sg */
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sg->length -= qc->pad_len;
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DPRINTK("padding done, sg->length=%u pad_len=%u\n",
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sg->length, qc->pad_len);
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}
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dma_address = dma_map_single(ap->host_set->dev, qc->buf_virt,
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sg->length, dir);
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if (dma_mapping_error(dma_address))
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@ -2372,12 +2419,47 @@ static int ata_sg_setup_one(struct ata_queued_cmd *qc)
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static int ata_sg_setup(struct ata_queued_cmd *qc)
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{
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struct ata_port *ap = qc->ap;
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struct scatterlist *sg = qc->sg;
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struct scatterlist *sg = qc->__sg;
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struct scatterlist *lsg = &sg[qc->n_elem - 1];
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int n_elem, dir;
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VPRINTK("ENTER, ata%u\n", ap->id);
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assert(qc->flags & ATA_QCFLAG_SG);
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/* we must lengthen transfers to end on a 32-bit boundary */
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qc->pad_len = lsg->length & 3;
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if (qc->pad_len) {
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void *pad_buf = ap->pad + (qc->tag * ATA_DMA_PAD_SZ);
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struct scatterlist *psg = &qc->pad_sgent;
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unsigned int offset;
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assert(qc->dev->class == ATA_DEV_ATAPI);
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memset(pad_buf, 0, ATA_DMA_PAD_SZ);
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/*
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* psg->page/offset are used to copy to-be-written
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* data in this function or read data in ata_sg_clean.
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*/
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offset = lsg->offset + lsg->length - qc->pad_len;
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psg->page = nth_page(lsg->page, offset >> PAGE_SHIFT);
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psg->offset = offset_in_page(offset);
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if (qc->tf.flags & ATA_TFLAG_WRITE) {
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void *addr = kmap_atomic(psg->page, KM_IRQ0);
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memcpy(pad_buf, addr + psg->offset, qc->pad_len);
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kunmap_atomic(psg->page, KM_IRQ0);
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}
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sg_dma_address(psg) = ap->pad_dma + (qc->tag * ATA_DMA_PAD_SZ);
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sg_dma_len(psg) = ATA_DMA_PAD_SZ;
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/* trim last sg */
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lsg->length -= qc->pad_len;
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DPRINTK("padding done, sg[%d].length=%u pad_len=%u\n",
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qc->n_elem - 1, lsg->length, qc->pad_len);
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}
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dir = qc->dma_dir;
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n_elem = dma_map_sg(ap->host_set->dev, sg, qc->n_elem, dir);
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if (n_elem < 1)
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@ -2655,7 +2737,7 @@ static void ata_data_xfer(struct ata_port *ap, unsigned char *buf,
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static void ata_pio_sector(struct ata_queued_cmd *qc)
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{
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int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
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struct scatterlist *sg = qc->sg;
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struct scatterlist *sg = qc->__sg;
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struct ata_port *ap = qc->ap;
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struct page *page;
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unsigned int offset;
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@ -2705,7 +2787,7 @@ static void ata_pio_sector(struct ata_queued_cmd *qc)
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static void __atapi_pio_bytes(struct ata_queued_cmd *qc, unsigned int bytes)
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{
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int do_write = (qc->tf.flags & ATA_TFLAG_WRITE);
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struct scatterlist *sg = qc->sg;
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struct scatterlist *sg = qc->__sg;
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struct ata_port *ap = qc->ap;
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struct page *page;
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unsigned char *buf;
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@ -2738,7 +2820,7 @@ static void __atapi_pio_bytes(struct ata_queued_cmd *qc, unsigned int bytes)
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return;
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}
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sg = &qc->sg[qc->cursg];
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sg = &qc->__sg[qc->cursg];
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page = sg->page;
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offset = sg->offset + qc->cursg_ofs;
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@ -3145,7 +3227,7 @@ struct ata_queued_cmd *ata_qc_new_init(struct ata_port *ap,
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qc = ata_qc_new(ap);
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if (qc) {
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qc->sg = NULL;
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qc->__sg = NULL;
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qc->flags = 0;
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qc->scsicmd = NULL;
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qc->ap = ap;
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@ -3837,6 +3919,12 @@ int ata_port_start (struct ata_port *ap)
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if (!ap->prd)
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return -ENOMEM;
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ap->pad = dma_alloc_coherent(dev, ATA_DMA_PAD_BUF_SZ, &ap->pad_dma, GFP_KERNEL);
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if (!ap->pad) {
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dma_free_coherent(dev, ATA_PRD_TBL_SZ, ap->prd, ap->prd_dma);
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return -ENOMEM;
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}
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DPRINTK("prd alloc, virt %p, dma %llx\n", ap->prd, (unsigned long long) ap->prd_dma);
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return 0;
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@ -3859,6 +3947,7 @@ void ata_port_stop (struct ata_port *ap)
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struct device *dev = ap->host_set->dev;
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dma_free_coherent(dev, ATA_PRD_TBL_SZ, ap->prd, ap->prd_dma);
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dma_free_coherent(dev, ATA_DMA_PAD_BUF_SZ, ap->pad, ap->pad_dma);
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}
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void ata_host_stop (struct ata_host_set *host_set)
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@ -150,10 +150,10 @@ struct ata_queued_cmd *ata_scsi_qc_new(struct ata_port *ap,
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qc->scsidone = done;
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if (cmd->use_sg) {
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qc->sg = (struct scatterlist *) cmd->request_buffer;
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qc->__sg = (struct scatterlist *) cmd->request_buffer;
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qc->n_elem = cmd->use_sg;
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} else {
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qc->sg = &qc->sgent;
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qc->__sg = &qc->sgent;
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qc->n_elem = 1;
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}
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} else {
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@ -364,6 +364,16 @@ int ata_scsi_slave_config(struct scsi_device *sdev)
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*/
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blk_queue_max_sectors(sdev->request_queue, 2048);
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}
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/*
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* SATA DMA transfers must be multiples of 4 byte, so
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* we need to pad ATAPI transfers using an extra sg.
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* Decrement max hw segments accordingly.
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*/
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if (dev->class == ATA_DEV_ATAPI) {
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request_queue_t *q = sdev->request_queue;
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blk_queue_max_hw_segments(q, q->max_hw_segments - 1);
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}
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}
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return 0; /* scsi layer doesn't check return value, sigh */
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@ -268,16 +268,17 @@ static void qs_scr_write (struct ata_port *ap, unsigned int sc_reg, u32 val)
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static void qs_fill_sg(struct ata_queued_cmd *qc)
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{
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struct scatterlist *sg = qc->sg;
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struct scatterlist *sg;
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struct ata_port *ap = qc->ap;
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struct qs_port_priv *pp = ap->private_data;
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unsigned int nelem;
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u8 *prd = pp->pkt + QS_CPB_BYTES;
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assert(sg != NULL);
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assert(qc->__sg != NULL);
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assert(qc->n_elem > 0);
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for (nelem = 0; nelem < qc->n_elem; nelem++,sg++) {
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nelem = 0;
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ata_for_each_sg(sg, qc) {
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u64 addr;
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u32 len;
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@ -291,6 +292,7 @@ static void qs_fill_sg(struct ata_queued_cmd *qc)
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VPRINTK("PRD[%u] = (0x%llX, 0x%X)\n", nelem,
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(unsigned long long)addr, len);
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nelem++;
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}
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}
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@ -449,14 +449,14 @@ static inline void pdc20621_host_pkt(struct ata_taskfile *tf, u8 *buf,
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static void pdc20621_dma_prep(struct ata_queued_cmd *qc)
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{
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struct scatterlist *sg = qc->sg;
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struct scatterlist *sg;
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struct ata_port *ap = qc->ap;
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struct pdc_port_priv *pp = ap->private_data;
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void __iomem *mmio = ap->host_set->mmio_base;
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struct pdc_host_priv *hpriv = ap->host_set->private_data;
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void __iomem *dimm_mmio = hpriv->dimm_mmio;
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unsigned int portno = ap->port_no;
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unsigned int i, last, idx, total_len = 0, sgt_len;
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unsigned int i, idx, total_len = 0, sgt_len;
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u32 *buf = (u32 *) &pp->dimm_buf[PDC_DIMM_HEADER_SZ];
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assert(qc->flags & ATA_QCFLAG_DMAMAP);
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@ -469,12 +469,11 @@ static void pdc20621_dma_prep(struct ata_queued_cmd *qc)
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/*
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* Build S/G table
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*/
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last = qc->n_elem;
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idx = 0;
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for (i = 0; i < last; i++) {
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buf[idx++] = cpu_to_le32(sg_dma_address(&sg[i]));
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buf[idx++] = cpu_to_le32(sg_dma_len(&sg[i]));
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total_len += sg_dma_len(&sg[i]);
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ata_for_each_sg(sg, qc) {
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buf[idx++] = cpu_to_le32(sg_dma_address(sg));
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buf[idx++] = cpu_to_le32(sg_dma_len(sg));
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total_len += sg_dma_len(sg);
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}
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buf[idx - 1] |= cpu_to_le32(ATA_PRD_EOT);
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sgt_len = idx * 4;
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@ -154,6 +154,10 @@ enum {
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ATA_SHIFT_UDMA = 0,
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ATA_SHIFT_MWDMA = 8,
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ATA_SHIFT_PIO = 11,
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/* size of buffer to pad xfers ending on unaligned boundaries */
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ATA_DMA_PAD_SZ = 4,
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ATA_DMA_PAD_BUF_SZ = ATA_DMA_PAD_SZ * ATA_MAX_QUEUE,
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};
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enum pio_task_states {
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@ -237,9 +241,12 @@ struct ata_queued_cmd {
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unsigned long flags; /* ATA_QCFLAG_xxx */
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unsigned int tag;
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unsigned int n_elem;
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unsigned int orig_n_elem;
|
||||
|
||||
int dma_dir;
|
||||
|
||||
unsigned int pad_len;
|
||||
|
||||
unsigned int nsect;
|
||||
unsigned int cursect;
|
||||
|
||||
@ -250,9 +257,11 @@ 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;
|
||||
|
||||
@ -295,6 +304,9 @@ 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 */
|
||||
@ -458,6 +470,19 @@ 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;
|
||||
|
||||
Loading…
Reference in New Issue
Block a user