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[PATCH] libata: Marvell spinlock fixes and simplification
This should fix up lockups that people were seeing due to improper spinlock placement. Also, the start/stop DMA routines put guarded trust in the cached state of DMA. Signed-off-by: Brett Russ <russb@emc.com> Signed-off-by: Jeff Garzik <jgarzik@pobox.com>
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a939c96315
commit
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1 changed files with 24 additions and 34 deletions
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@ -35,7 +35,7 @@
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#include <asm/io.h>
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#define DRV_NAME "sata_mv"
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#define DRV_VERSION "0.22"
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#define DRV_VERSION "0.23"
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enum {
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/* BAR's are enumerated in terms of pci_resource_start() terms */
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@ -406,40 +406,30 @@ static void mv_irq_clear(struct ata_port *ap)
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{
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}
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static void mv_start_dma(void __iomem *base, struct mv_port_priv *pp,
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struct ata_port *ap)
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static void mv_start_dma(void __iomem *base, struct mv_port_priv *pp)
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{
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unsigned long flags;
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spin_lock_irqsave(&ap->host_set->lock, flags);
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writelfl(EDMA_EN, base + EDMA_CMD_OFS);
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pp->pp_flags |= MV_PP_FLAG_EDMA_EN;
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spin_unlock_irqrestore(&ap->host_set->lock, flags);
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if (!(MV_PP_FLAG_EDMA_EN & pp->pp_flags)) {
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writelfl(EDMA_EN, base + EDMA_CMD_OFS);
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pp->pp_flags |= MV_PP_FLAG_EDMA_EN;
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}
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assert(EDMA_EN & readl(base + EDMA_CMD_OFS));
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}
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static void mv_stop_dma(struct ata_port *ap)
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{
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void __iomem *port_mmio = mv_ap_base(ap);
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struct mv_port_priv *pp = ap->private_data;
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unsigned long flags;
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u32 reg;
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int i;
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spin_lock_irqsave(&ap->host_set->lock, flags);
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if (!(MV_PP_FLAG_EDMA_DS_ACT & pp->pp_flags) &&
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((MV_PP_FLAG_EDMA_EN & pp->pp_flags) ||
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(EDMA_EN & readl(port_mmio + EDMA_CMD_OFS)))) {
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/* Disable EDMA if we're not already trying to disable it
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* and it is currently active. The disable bit auto clears.
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if (MV_PP_FLAG_EDMA_EN & pp->pp_flags) {
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/* Disable EDMA if active. The disable bit auto clears.
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*/
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pp->pp_flags |= MV_PP_FLAG_EDMA_DS_ACT;
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writelfl(EDMA_DS, port_mmio + EDMA_CMD_OFS);
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pp->pp_flags &= ~MV_PP_FLAG_EDMA_EN;
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}
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spin_unlock_irqrestore(&ap->host_set->lock, flags);
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} else {
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assert(!(EDMA_EN & readl(port_mmio + EDMA_CMD_OFS)));
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}
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/* now properly wait for the eDMA to stop */
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for (i = 1000; i > 0; i--) {
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@ -450,12 +440,9 @@ static void mv_stop_dma(struct ata_port *ap)
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udelay(100);
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}
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spin_lock_irqsave(&ap->host_set->lock, flags);
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pp->pp_flags &= ~MV_PP_FLAG_EDMA_DS_ACT;
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spin_unlock_irqrestore(&ap->host_set->lock, flags);
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if (EDMA_EN & reg) {
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printk(KERN_ERR "ata%u: Unable to stop eDMA\n", ap->id);
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/* FIXME: Consider doing a reset here to recover */
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}
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}
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@ -716,8 +703,11 @@ static void mv_port_stop(struct ata_port *ap)
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{
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struct device *dev = ap->host_set->dev;
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struct mv_port_priv *pp = ap->private_data;
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unsigned long flags;
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spin_lock_irqsave(&ap->host_set->lock, flags);
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mv_stop_dma(ap);
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spin_unlock_irqrestore(&ap->host_set->lock, flags);
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ap->private_data = NULL;
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dma_free_coherent(dev, MV_PORT_PRIV_DMA_SZ, pp->crpb, pp->crpb_dma);
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@ -867,11 +857,7 @@ static int mv_qc_issue(struct ata_queued_cmd *qc)
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mv_inc_q_index(&pp->req_producer); /* now incr producer index */
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if (!(MV_PP_FLAG_EDMA_EN & pp->pp_flags)) {
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/* turn on EDMA if not already on */
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mv_start_dma(port_mmio, pp, qc->ap);
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}
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assert(EDMA_EN & readl(port_mmio + EDMA_CMD_OFS));
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mv_start_dma(port_mmio, pp);
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/* and write the request in pointer to kick the EDMA to life */
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in_ptr &= EDMA_REQ_Q_BASE_LO_MASK;
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@ -921,8 +907,12 @@ static void mv_err_intr(struct ata_port *ap)
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serr = scr_read(ap, SCR_ERROR);
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scr_write_flush(ap, SCR_ERROR, serr);
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}
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DPRINTK("port %u error; EDMA err cause: 0x%08x SERR: 0x%08x\n",
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ap->port_no, edma_err_cause, serr);
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if (EDMA_ERR_SELF_DIS & edma_err_cause) {
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struct mv_port_priv *pp = ap->private_data;
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pp->pp_flags &= ~MV_PP_FLAG_EDMA_EN;
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}
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DPRINTK(KERN_ERR "ata%u: port error; EDMA err cause: 0x%08x "
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"SERR: 0x%08x\n", ap->id, edma_err_cause, serr);
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/* Clear EDMA now that SERR cleanup done */
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writelfl(0, port_mmio + EDMA_ERR_IRQ_CAUSE_OFS);
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@ -1034,7 +1024,7 @@ static irqreturn_t mv_interrupt(int irq, void *dev_instance,
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printk(KERN_ERR DRV_NAME ": PCI ERROR; PCI IRQ cause=0x%08x\n",
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readl(mmio + PCI_IRQ_CAUSE_OFS));
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VPRINTK("All regs @ PCI error\n");
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DPRINTK("All regs @ PCI error\n");
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mv_dump_all_regs(mmio, -1, to_pci_dev(host_set->dev));
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writelfl(0, mmio + PCI_IRQ_CAUSE_OFS);
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