[libata] sata_mv: clean up DMA boundary issues, turn on 64-bit DMA
The chips covered by sata_mv have a 32-bit DMA boundary they must not cross, not a 64K boundary. We are merely limited to a 64K maximum segment size. Therefore, the DMA scatter/gather table fill code can be greatly simplified, and we need not cut in half the S/G table size as reported to the SCSI layer. Also, the driver forget to turn on 64-bit DMA at the PCI layer. All other data structures (both hardware and software) have been prepped for 64-bit PCI DMA. It was simply never turned on. <fingers crossed> let's see if it still works... Signed-off-by: Jeff Garzik <jeff@garzik.org>
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@ -253,10 +253,7 @@ enum {
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#define IS_GEN_IIE(hpriv) ((hpriv)->hp_flags & MV_HP_GEN_IIE)
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enum {
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/* Our DMA boundary is determined by an ePRD being unable to handle
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* anything larger than 64KB
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*/
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MV_DMA_BOUNDARY = 0xffffU,
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MV_DMA_BOUNDARY = 0xffffffffU,
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EDMA_REQ_Q_BASE_LO_MASK = 0xfffffc00U,
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@ -384,10 +381,10 @@ static struct scsi_host_template mv_sht = {
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.queuecommand = ata_scsi_queuecmd,
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.can_queue = MV_USE_Q_DEPTH,
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.this_id = ATA_SHT_THIS_ID,
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.sg_tablesize = MV_MAX_SG_CT / 2,
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.sg_tablesize = MV_MAX_SG_CT,
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.cmd_per_lun = ATA_SHT_CMD_PER_LUN,
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.emulated = ATA_SHT_EMULATED,
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.use_clustering = ATA_SHT_USE_CLUSTERING,
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.use_clustering = 1,
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.proc_name = DRV_NAME,
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.dma_boundary = MV_DMA_BOUNDARY,
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.slave_configure = ata_scsi_slave_config,
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@ -585,6 +582,39 @@ static const struct mv_hw_ops mv6xxx_ops = {
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static int msi; /* Use PCI msi; either zero (off, default) or non-zero */
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/* move to PCI layer or libata core? */
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static int pci_go_64(struct pci_dev *pdev)
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{
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int rc;
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if (!pci_set_dma_mask(pdev, DMA_64BIT_MASK)) {
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rc = pci_set_consistent_dma_mask(pdev, DMA_64BIT_MASK);
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if (rc) {
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rc = pci_set_consistent_dma_mask(pdev, DMA_32BIT_MASK);
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if (rc) {
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dev_printk(KERN_ERR, &pdev->dev,
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"64-bit DMA enable failed\n");
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return rc;
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}
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}
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} else {
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rc = pci_set_dma_mask(pdev, DMA_32BIT_MASK);
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if (rc) {
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dev_printk(KERN_ERR, &pdev->dev,
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"32-bit DMA enable failed\n");
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return rc;
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}
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rc = pci_set_consistent_dma_mask(pdev, DMA_32BIT_MASK);
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if (rc) {
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dev_printk(KERN_ERR, &pdev->dev,
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"32-bit consistent DMA enable failed\n");
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return rc;
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}
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}
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return rc;
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}
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/*
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* Functions
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*/
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@ -957,38 +987,30 @@ static void mv_port_stop(struct ata_port *ap)
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* LOCKING:
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* Inherited from caller.
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*/
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static void mv_fill_sg(struct ata_queued_cmd *qc)
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static unsigned int mv_fill_sg(struct ata_queued_cmd *qc)
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{
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struct mv_port_priv *pp = qc->ap->private_data;
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unsigned int i = 0;
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unsigned int n_sg = 0;
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struct scatterlist *sg;
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struct mv_sg *mv_sg;
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mv_sg = pp->sg_tbl;
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ata_for_each_sg(sg, qc) {
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dma_addr_t addr;
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u32 sg_len, len, offset;
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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(sg);
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sg_len = sg_dma_len(sg);
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mv_sg->addr = cpu_to_le32(addr & 0xffffffff);
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mv_sg->addr_hi = cpu_to_le32((addr >> 16) >> 16);
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mv_sg->flags_size = cpu_to_le32(sg_len & 0xffff);
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while (sg_len) {
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offset = addr & MV_DMA_BOUNDARY;
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len = sg_len;
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if ((offset + sg_len) > 0x10000)
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len = 0x10000 - offset;
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if (ata_sg_is_last(sg, qc))
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mv_sg->flags_size |= cpu_to_le32(EPRD_FLAG_END_OF_TBL);
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pp->sg_tbl[i].addr = cpu_to_le32(addr & 0xffffffff);
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pp->sg_tbl[i].addr_hi = cpu_to_le32((addr >> 16) >> 16);
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pp->sg_tbl[i].flags_size = cpu_to_le32(len & 0xffff);
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sg_len -= len;
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addr += len;
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if (!sg_len && ata_sg_is_last(sg, qc))
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pp->sg_tbl[i].flags_size |= cpu_to_le32(EPRD_FLAG_END_OF_TBL);
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i++;
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}
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mv_sg++;
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n_sg++;
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}
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return n_sg;
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}
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static inline unsigned mv_inc_q_index(unsigned index)
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@ -2327,6 +2349,10 @@ static int mv_init_one(struct pci_dev *pdev, const struct pci_device_id *ent)
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if (rc)
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return rc;
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rc = pci_go_64(pdev);
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if (rc)
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return rc;
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probe_ent = devm_kzalloc(dev, sizeof(*probe_ent), GFP_KERNEL);
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if (probe_ent == NULL)
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return -ENOMEM;
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