drivers/infiniband/hw/hfi1/file_ops.c

Source file repositories/reference/linux-study-clean/drivers/infiniband/hw/hfi1/file_ops.c

File Facts

System
Linux kernel
Corpus path
drivers/infiniband/hw/hfi1/file_ops.c
Extension
.c
Size
44575 bytes
Lines
1715
Domain
Driver Families
Bucket
drivers/infiniband
Inferred role
Driver Families: operation-table or driver-model contract
Status
pattern 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

static const struct file_operations hfi1_file_ops = {
	.owner = THIS_MODULE,
	.write_iter = hfi1_write_iter,
	.open = hfi1_file_open,
	.release = hfi1_file_close,
	.unlocked_ioctl = hfi1_file_ioctl,
	.poll = hfi1_poll,
	.mmap = hfi1_file_mmap,
	.llseek = noop_llseek,
};

static const struct vm_operations_struct vm_ops = {
	.fault = vma_fault,
};

/*
 * Types of memories mapped into user processes' space
 */
enum mmap_types {
	PIO_BUFS = 1,
	PIO_BUFS_SOP,
	PIO_CRED,
	RCV_HDRQ,
	RCV_EGRBUF,
	UREGS,
	EVENTS,
	STATUS,
	RTAIL,
	SUBCTXT_UREGS,
	SUBCTXT_RCV_HDRQ,
	SUBCTXT_EGRBUF,
	SDMA_COMP
};

/*
 * Masks and offsets defining the mmap tokens
 */
#define HFI1_MMAP_OFFSET_MASK   0xfffULL
#define HFI1_MMAP_OFFSET_SHIFT  0
#define HFI1_MMAP_SUBCTXT_MASK  0xfULL
#define HFI1_MMAP_SUBCTXT_SHIFT 12
#define HFI1_MMAP_CTXT_MASK     0xffULL
#define HFI1_MMAP_CTXT_SHIFT    16
#define HFI1_MMAP_TYPE_MASK     0xfULL
#define HFI1_MMAP_TYPE_SHIFT    24
#define HFI1_MMAP_MAGIC_MASK    0xffffffffULL
#define HFI1_MMAP_MAGIC_SHIFT   32

#define HFI1_MMAP_MAGIC         0xdabbad00

#define HFI1_MMAP_TOKEN_SET(field, val)	\
	(((val) & HFI1_MMAP_##field##_MASK) << HFI1_MMAP_##field##_SHIFT)
#define HFI1_MMAP_TOKEN_GET(field, token) \
	(((token) >> HFI1_MMAP_##field##_SHIFT) & HFI1_MMAP_##field##_MASK)
#define HFI1_MMAP_TOKEN(type, ctxt, subctxt, addr)   \
	(HFI1_MMAP_TOKEN_SET(MAGIC, HFI1_MMAP_MAGIC) | \
	HFI1_MMAP_TOKEN_SET(TYPE, type) | \
	HFI1_MMAP_TOKEN_SET(CTXT, ctxt) | \
	HFI1_MMAP_TOKEN_SET(SUBCTXT, subctxt) | \
	HFI1_MMAP_TOKEN_SET(OFFSET, (offset_in_page(addr))))

#define dbg(fmt, ...)				\
	pr_info(fmt, ##__VA_ARGS__)

static inline int is_valid_mmap(u64 token)
{
	return (HFI1_MMAP_TOKEN_GET(MAGIC, token) == HFI1_MMAP_MAGIC);
}

static int hfi1_file_open(struct inode *inode, struct file *fp)
{
	struct hfi1_filedata *fd;
	struct hfi1_devdata *dd = container_of(inode->i_cdev,
					       struct hfi1_devdata,
					       user_cdev);

	if (!((dd->flags & HFI1_PRESENT) && dd->kregbase1))
		return -EINVAL;

	if (!refcount_inc_not_zero(&dd->user_refcount))
		return -ENXIO;

	/* The real work is performed later in assign_ctxt() */

	fd = kzalloc_obj(*fd);

	if (!fd || init_srcu_struct(&fd->pq_srcu))
		goto nomem;
	spin_lock_init(&fd->pq_rcu_lock);
	spin_lock_init(&fd->tid_lock);

Annotation

Implementation Notes