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Commit f6ab95b5 authored by Dan Williams's avatar Dan Williams
Browse files

ioat: preserve chanctrl bits when re-arming interrupts 



The register write in ioat_dma_cleanup_tasklet is unfortunate in two
ways:
1/ It clears the extra 'enable' bits that we set at alloc_chan_resources time
2/ It gives the impression that it disables interrupts when it is in
   fact re-arming interrupts

[ Impact: fix, persist the value of the chanctrl register when re-arming ]

Signed-off-by: default avatarMaciej Sosnowski <maciej.sosnowski@intel.com>
Signed-off-by: default avatarDan Williams <dan.j.williams@intel.com>
parent bb320786

drivers/dma/ioat/dma.c

+3 −7
Original line number Diff line number Diff line
@@ -452,7 +452,6 @@ static int ioat1_dma_alloc_chan_resources(struct dma_chan *c) 
	struct ioat_dma_chan *ioat = to_ioat_chan(c);

	struct ioat_chan_common *chan = &ioat->base;

	struct ioat_desc_sw *desc;

	u16 chanctrl;

	u32 chanerr;

	int i;

	LIST_HEAD(tmp_list);
@@ -462,10 +461,7 @@ static int ioat1_dma_alloc_chan_resources(struct dma_chan *c) 
		return ioat->desccount;



	/* Setup register to interrupt and write completion status on error */

	chanctrl = IOAT_CHANCTRL_ERR_INT_EN |

		IOAT_CHANCTRL_ANY_ERR_ABORT_EN |

		IOAT_CHANCTRL_ERR_COMPLETION_EN;

	writew(chanctrl, chan->reg_base + IOAT_CHANCTRL_OFFSET);

	writew(IOAT_CHANCTRL_RUN, chan->reg_base + IOAT_CHANCTRL_OFFSET);



	chanerr = readl(chan->reg_base + IOAT_CHANERR_OFFSET);

	if (chanerr) {
@@ -672,9 +668,9 @@ ioat1_dma_prep_memcpy(struct dma_chan *c, dma_addr_t dma_dest, 
static void ioat1_cleanup_tasklet(unsigned long data)

{

	struct ioat_dma_chan *chan = (void *)data;



	ioat1_cleanup(chan);

	writew(IOAT_CHANCTRL_INT_DISABLE,

	       chan->base.reg_base + IOAT_CHANCTRL_OFFSET);

	writew(IOAT_CHANCTRL_RUN, chan->base.reg_base + IOAT_CHANCTRL_OFFSET);

}



static void ioat_unmap(struct pci_dev *pdev, dma_addr_t addr, size_t len,

drivers/dma/ioat/dma_v2.c

+2 −6
Original line number Diff line number Diff line
@@ -341,8 +341,7 @@ static void ioat2_cleanup_tasklet(unsigned long data) 
	struct ioat2_dma_chan *ioat = (void *) data;



	ioat2_cleanup(ioat);

	writew(IOAT_CHANCTRL_INT_DISABLE,

	       ioat->base.reg_base + IOAT_CHANCTRL_OFFSET);

	writew(IOAT_CHANCTRL_RUN, ioat->base.reg_base + IOAT_CHANCTRL_OFFSET);

}



/**
@@ -454,7 +453,6 @@ static int ioat2_alloc_chan_resources(struct dma_chan *c) 
	struct ioat2_dma_chan *ioat = to_ioat2_chan(c);

	struct ioat_chan_common *chan = &ioat->base;

	struct ioat_ring_ent **ring;

	u16 chanctrl;

	u32 chanerr;

	int descs;

	int i;
@@ -464,9 +462,7 @@ static int ioat2_alloc_chan_resources(struct dma_chan *c) 
		return 1 << ioat->alloc_order;



	/* Setup register to interrupt and write completion status on error */

	chanctrl = IOAT_CHANCTRL_ERR_INT_EN | IOAT_CHANCTRL_ANY_ERR_ABORT_EN |

		   IOAT_CHANCTRL_ERR_COMPLETION_EN;

	writew(chanctrl, chan->reg_base + IOAT_CHANCTRL_OFFSET);

	writew(IOAT_CHANCTRL_RUN, chan->reg_base + IOAT_CHANCTRL_OFFSET);



	chanerr = readl(chan->reg_base + IOAT_CHANERR_OFFSET);

	if (chanerr) {

drivers/dma/ioat/registers.h

+5 −1
Original line number Diff line number Diff line
@@ -75,7 +75,11 @@ 
#define IOAT_CHANCTRL_ERR_INT_EN		0x0010

#define IOAT_CHANCTRL_ANY_ERR_ABORT_EN		0x0008

#define IOAT_CHANCTRL_ERR_COMPLETION_EN		0x0004

#define IOAT_CHANCTRL_INT_DISABLE		0x0001

#define IOAT_CHANCTRL_INT_REARM			0x0001

#define IOAT_CHANCTRL_RUN			(IOAT_CHANCTRL_INT_REARM |\

						 IOAT_CHANCTRL_ERR_COMPLETION_EN |\

						 IOAT_CHANCTRL_ANY_ERR_ABORT_EN |\

						 IOAT_CHANCTRL_ERR_INT_EN)



#define IOAT_DMA_COMP_OFFSET			0x02	/* 16-bit DMA channel compatibility */

#define IOAT_DMA_COMP_V1			0x0001	/* Compatibility with DMA version 1 */