include/soc/fsl/bman.h

Source file repositories/reference/linux-study-clean/include/soc/fsl/bman.h

File Facts

System
Linux kernel
Corpus path
include/soc/fsl/bman.h
Extension
.h
Size
5076 bytes
Lines
146
Domain
Repository Root And Misc
Bucket
include
Inferred role
Repository Root And Misc: implementation source
Status
source implementation candidate

Why This File Exists

Top-level or miscellaneous repository surface. Use this as map coverage unless a later manual pass promotes the file into a deeper subsystem dossier.

Dependency Surface

Detected Declarations

Annotated Snippet

struct bm_buffer {
	union {
		struct {
			__be16 bpid; /* hi 8-bits reserved */
			__be16 hi; /* High 16-bits of 48-bit address */
			__be32 lo; /* Low 32-bits of 48-bit address */
		};
		__be64 data;
	};
} __aligned(8);
/*
 * Restore the 48 bit address previously stored in BMan
 * hardware pools as a dma_addr_t
 */
static inline dma_addr_t bm_buf_addr(const struct bm_buffer *buf)
{
	return be64_to_cpu(buf->data) & 0xffffffffffffLLU;
}

static inline u64 bm_buffer_get64(const struct bm_buffer *buf)
{
	return be64_to_cpu(buf->data) & 0xffffffffffffLLU;
}

static inline void bm_buffer_set64(struct bm_buffer *buf, u64 addr)
{
	buf->hi = cpu_to_be16(upper_32_bits(addr));
	buf->lo = cpu_to_be32(lower_32_bits(addr));
}

static inline u8 bm_buffer_get_bpid(const struct bm_buffer *buf)
{
	return be16_to_cpu(buf->bpid) & 0xff;
}

static inline void bm_buffer_set_bpid(struct bm_buffer *buf, int bpid)
{
	buf->bpid = cpu_to_be16(bpid & 0xff);
}

/* Managed portal, high-level i/face */

/* Portal and Buffer Pools */
struct bman_portal;
struct bman_pool;

#define BM_POOL_MAX		64 /* max # of buffer pools */

/**
 * bman_new_pool - Allocates a Buffer Pool object
 *
 * Creates a pool object, and returns a reference to it or NULL on error.
 */
struct bman_pool *bman_new_pool(void);

/**
 * bman_free_pool - Deallocates a Buffer Pool object
 * @pool: the pool object to release
 */
void bman_free_pool(struct bman_pool *pool);

/**
 * bman_get_bpid - Returns a pool object's BPID.
 * @pool: the pool object
 *
 * The returned value is the index of the encapsulated buffer pool,
 * in the range of [0, @BM_POOL_MAX-1].
 */
int bman_get_bpid(const struct bman_pool *pool);

/**
 * bman_release - Release buffer(s) to the buffer pool
 * @pool: the buffer pool object to release to
 * @bufs: an array of buffers to release
 * @num: the number of buffers in @bufs (1-8)
 *
 * Adds the given buffers to RCR entries. If the RCR ring is unresponsive,
 * the function will return -ETIMEDOUT. Otherwise, it returns zero.
 */
int bman_release(struct bman_pool *pool, const struct bm_buffer *bufs, u8 num);

/**
 * bman_acquire - Acquire buffer(s) from a buffer pool
 * @pool: the buffer pool object to acquire from
 * @bufs: array for storing the acquired buffers
 * @num: the number of buffers desired (@bufs is at least this big)
 *
 * Issues an "Acquire" command via the portal's management command interface.
 * The return value will be the number of buffers obtained from the pool, or a
 * negative error code if a h/w error or pool starvation was encountered. In

Annotation

Implementation Notes