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Commit afb0edd9 authored by Brett Russ's avatar Brett Russ Committed by Jeff Garzik
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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: default avatarBrett Russ <russb@emc.com>
Signed-off-by: default avatarJeff Garzik <jgarzik@pobox.com>
parent a939c963

drivers/scsi/sata_mv.c

+24 −34
Original line number Diff line number Diff line
@@ -35,7 +35,7 @@ 
#include <asm/io.h>



#define DRV_NAME	"sata_mv"

#define DRV_VERSION	"0.22"

#define DRV_VERSION	"0.23"



enum {

	/* BAR's are enumerated in terms of pci_resource_start() terms */
@@ -406,40 +406,30 @@ static void mv_irq_clear(struct ata_port *ap) 
{

}



static void mv_start_dma(void __iomem *base, struct mv_port_priv *pp,

			 struct ata_port *ap)

static void mv_start_dma(void __iomem *base, struct mv_port_priv *pp)

{

	unsigned long flags;



	spin_lock_irqsave(&ap->host_set->lock, flags);

	

	if (!(MV_PP_FLAG_EDMA_EN & pp->pp_flags)) {

		writelfl(EDMA_EN, base + EDMA_CMD_OFS);

		pp->pp_flags |= MV_PP_FLAG_EDMA_EN;



	spin_unlock_irqrestore(&ap->host_set->lock, flags);

	}

	assert(EDMA_EN & readl(base + EDMA_CMD_OFS));

}



static void mv_stop_dma(struct ata_port *ap)

{

	void __iomem *port_mmio = mv_ap_base(ap);

	struct mv_port_priv *pp	= ap->private_data;

	unsigned long flags;

	u32 reg;

	int i;



	spin_lock_irqsave(&ap->host_set->lock, flags);

	

	if (!(MV_PP_FLAG_EDMA_DS_ACT & pp->pp_flags) &&

	    ((MV_PP_FLAG_EDMA_EN & pp->pp_flags) ||

	     (EDMA_EN & readl(port_mmio + EDMA_CMD_OFS)))) {

		/* Disable EDMA if we're not already trying to disable it

		 * and it is currently active.   The disable bit auto clears.

	if (MV_PP_FLAG_EDMA_EN & pp->pp_flags) {

		/* Disable EDMA if active.   The disable bit auto clears.

		 */

		pp->pp_flags |= MV_PP_FLAG_EDMA_DS_ACT;

		writelfl(EDMA_DS, port_mmio + EDMA_CMD_OFS);

		pp->pp_flags &= ~MV_PP_FLAG_EDMA_EN;

	} else {

		assert(!(EDMA_EN & readl(port_mmio + EDMA_CMD_OFS)));

  	}

	spin_unlock_irqrestore(&ap->host_set->lock, flags);

	

	/* now properly wait for the eDMA to stop */

	for (i = 1000; i > 0; i--) {
@@ -450,12 +440,9 @@ static void mv_stop_dma(struct ata_port *ap) 
		udelay(100);

	}



	spin_lock_irqsave(&ap->host_set->lock, flags);

	pp->pp_flags &= ~MV_PP_FLAG_EDMA_DS_ACT;

	spin_unlock_irqrestore(&ap->host_set->lock, flags);



	if (EDMA_EN & reg) {

		printk(KERN_ERR "ata%u: Unable to stop eDMA\n", ap->id);

		/* FIXME: Consider doing a reset here to recover */

	}

}
@@ -716,8 +703,11 @@ static void mv_port_stop(struct ata_port *ap) 
{

	struct device *dev = ap->host_set->dev;

	struct mv_port_priv *pp = ap->private_data;

	unsigned long flags;



	spin_lock_irqsave(&ap->host_set->lock, flags);

	mv_stop_dma(ap);

	spin_unlock_irqrestore(&ap->host_set->lock, flags);



	ap->private_data = NULL;

	dma_free_coherent(dev, MV_PORT_PRIV_DMA_SZ, pp->crpb, pp->crpb_dma);
@@ -867,11 +857,7 @@ static int mv_qc_issue(struct ata_queued_cmd *qc) 


	mv_inc_q_index(&pp->req_producer);	/* now incr producer index */



	if (!(MV_PP_FLAG_EDMA_EN & pp->pp_flags)) {

		/* turn on EDMA if not already on */

		mv_start_dma(port_mmio, pp, qc->ap);

	}

	assert(EDMA_EN & readl(port_mmio + EDMA_CMD_OFS));

	mv_start_dma(port_mmio, pp);



	/* and write the request in pointer to kick the EDMA to life */

	in_ptr &= EDMA_REQ_Q_BASE_LO_MASK;
@@ -921,8 +907,12 @@ static void mv_err_intr(struct ata_port *ap) 
		serr = scr_read(ap, SCR_ERROR);

		scr_write_flush(ap, SCR_ERROR, serr);

	}

	DPRINTK("port %u error; EDMA err cause: 0x%08x SERR: 0x%08x\n", 

		ap->port_no, edma_err_cause, serr);

	if (EDMA_ERR_SELF_DIS & edma_err_cause) {

		struct mv_port_priv *pp	= ap->private_data;

		pp->pp_flags &= ~MV_PP_FLAG_EDMA_EN;

	}

	DPRINTK(KERN_ERR "ata%u: port error; EDMA err cause: 0x%08x "

		"SERR: 0x%08x\n", ap->id, edma_err_cause, serr);



	/* Clear EDMA now that SERR cleanup done */

	writelfl(0, port_mmio + EDMA_ERR_IRQ_CAUSE_OFS);
@@ -1034,7 +1024,7 @@ static irqreturn_t mv_interrupt(int irq, void *dev_instance, 
		printk(KERN_ERR DRV_NAME ": PCI ERROR; PCI IRQ cause=0x%08x\n",

		       readl(mmio + PCI_IRQ_CAUSE_OFS));



		VPRINTK("All regs @ PCI error\n");

		DPRINTK("All regs @ PCI error\n");

		mv_dump_all_regs(mmio, -1, to_pci_dev(host_set->dev));



		writelfl(0, mmio + PCI_IRQ_CAUSE_OFS);