drivers/scsi/snic/vnic_intr.h

Source file repositories/reference/linux-study-clean/drivers/scsi/snic/vnic_intr.h

File Facts

System
Linux kernel
Corpus path
drivers/scsi/snic/vnic_intr.h
Extension
.h
Size
2123 bytes
Lines
92
Domain
Driver Families
Bucket
drivers/scsi
Inferred role
Driver Families: implementation source
Status
source implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

Dependency Surface

Detected Declarations

Annotated Snippet

struct vnic_intr_ctrl {
	u32 coalescing_timer;		/* 0x00 */
	u32 pad0;
	u32 coalescing_value;		/* 0x08 */
	u32 pad1;
	u32 coalescing_type;		/* 0x10 */
	u32 pad2;
	u32 mask_on_assertion;		/* 0x18 */
	u32 pad3;
	u32 mask;			/* 0x20 */
	u32 pad4;
	u32 int_credits;		/* 0x28 */
	u32 pad5;
	u32 int_credit_return;		/* 0x30 */
	u32 pad6;
};

struct vnic_intr {
	unsigned int index;
	struct vnic_dev *vdev;
	struct vnic_intr_ctrl __iomem *ctrl;	/* memory-mapped */
};

static inline void
svnic_intr_unmask(struct vnic_intr *intr)
{
	iowrite32(0, &intr->ctrl->mask);
}

static inline void
svnic_intr_mask(struct vnic_intr *intr)
{
	iowrite32(1, &intr->ctrl->mask);
}

static inline void
svnic_intr_return_credits(struct vnic_intr *intr,
			  unsigned int credits,
			  int unmask,
			  int reset_timer)
{
#define VNIC_INTR_UNMASK_SHIFT		16
#define VNIC_INTR_RESET_TIMER_SHIFT	17

	u32 int_credit_return = (credits & 0xffff) |
		(unmask ? (1 << VNIC_INTR_UNMASK_SHIFT) : 0) |
		(reset_timer ? (1 << VNIC_INTR_RESET_TIMER_SHIFT) : 0);

	iowrite32(int_credit_return, &intr->ctrl->int_credit_return);
}

static inline unsigned int
svnic_intr_credits(struct vnic_intr *intr)
{
	return ioread32(&intr->ctrl->int_credits);
}

static inline void
svnic_intr_return_all_credits(struct vnic_intr *intr)
{
	unsigned int credits = svnic_intr_credits(intr);
	int unmask = 1;
	int reset_timer = 1;

	svnic_intr_return_credits(intr, credits, unmask, reset_timer);
}

void svnic_intr_free(struct vnic_intr *);
int svnic_intr_alloc(struct vnic_dev *, struct vnic_intr *, unsigned int);
void svnic_intr_init(struct vnic_intr *intr,
		     unsigned int coalescing_timer,
		     unsigned int coalescing_type,
		     unsigned int mask_on_assertion);
void svnic_intr_clean(struct vnic_intr *);

#endif /* _VNIC_INTR_H_ */

Annotation

Implementation Notes