![Christof Schmitt](/assets/img/avatar_default.png)
Move the code accessing the qdio sbales and zfcp_qdio_req struct to the zfcp_qdio files and provide helper functions for accessing the qdio related parts. Reviewed-by: Swen Schillig <swen@vnet.ibm.com> Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com> Signed-off-by: James Bottomley <James.Bottomley@suse.de>
214 lines
5.8 KiB
C
214 lines
5.8 KiB
C
/*
|
|
* zfcp device driver
|
|
*
|
|
* Header file for zfcp qdio interface
|
|
*
|
|
* Copyright IBM Corporation 2010
|
|
*/
|
|
|
|
#ifndef ZFCP_QDIO_H
|
|
#define ZFCP_QDIO_H
|
|
|
|
#include <asm/qdio.h>
|
|
|
|
#define ZFCP_QDIO_SBALE_LEN PAGE_SIZE
|
|
|
|
/* DMQ bug workaround: don't use last SBALE */
|
|
#define ZFCP_QDIO_MAX_SBALES_PER_SBAL (QDIO_MAX_ELEMENTS_PER_BUFFER - 1)
|
|
|
|
/* index of last SBALE (with respect to DMQ bug workaround) */
|
|
#define ZFCP_QDIO_LAST_SBALE_PER_SBAL (ZFCP_QDIO_MAX_SBALES_PER_SBAL - 1)
|
|
|
|
/**
|
|
* struct zfcp_qdio_queue - qdio queue buffer, zfcp index and free count
|
|
* @sbal: qdio buffers
|
|
* @first: index of next free buffer in queue
|
|
* @count: number of free buffers in queue
|
|
*/
|
|
struct zfcp_qdio_queue {
|
|
struct qdio_buffer *sbal[QDIO_MAX_BUFFERS_PER_Q];
|
|
u8 first;
|
|
atomic_t count;
|
|
};
|
|
|
|
/**
|
|
* struct zfcp_qdio - basic qdio data structure
|
|
* @resp_q: response queue
|
|
* @req_q: request queue
|
|
* @stat_lock: lock to protect req_q_util and req_q_time
|
|
* @req_q_lock: lock to serialize access to request queue
|
|
* @req_q_time: time of last fill level change
|
|
* @req_q_util: used for accounting
|
|
* @req_q_full: queue full incidents
|
|
* @req_q_wq: used to wait for SBAL availability
|
|
* @adapter: adapter used in conjunction with this qdio structure
|
|
*/
|
|
struct zfcp_qdio {
|
|
struct zfcp_qdio_queue resp_q;
|
|
struct zfcp_qdio_queue req_q;
|
|
spinlock_t stat_lock;
|
|
spinlock_t req_q_lock;
|
|
unsigned long long req_q_time;
|
|
u64 req_q_util;
|
|
atomic_t req_q_full;
|
|
wait_queue_head_t req_q_wq;
|
|
struct zfcp_adapter *adapter;
|
|
};
|
|
|
|
/**
|
|
* struct zfcp_qdio_req - qdio queue related values for a request
|
|
* @sbtype: sbal type flags for sbale 0
|
|
* @sbal_number: number of free sbals
|
|
* @sbal_first: first sbal for this request
|
|
* @sbal_last: last sbal for this request
|
|
* @sbal_limit: last possible sbal for this request
|
|
* @sbale_curr: current sbale at creation of this request
|
|
* @sbal_response: sbal used in interrupt
|
|
* @qdio_outb_usage: usage of outbound queue
|
|
* @qdio_inb_usage: usage of inbound queue
|
|
*/
|
|
struct zfcp_qdio_req {
|
|
u32 sbtype;
|
|
u8 sbal_number;
|
|
u8 sbal_first;
|
|
u8 sbal_last;
|
|
u8 sbal_limit;
|
|
u8 sbale_curr;
|
|
u8 sbal_response;
|
|
u16 qdio_outb_usage;
|
|
u16 qdio_inb_usage;
|
|
};
|
|
|
|
/**
|
|
* zfcp_qdio_sbale - return pointer to sbale in qdio queue
|
|
* @q: queue where to find sbal
|
|
* @sbal_idx: sbal index in queue
|
|
* @sbale_idx: sbale index in sbal
|
|
*/
|
|
static inline struct qdio_buffer_element *
|
|
zfcp_qdio_sbale(struct zfcp_qdio_queue *q, int sbal_idx, int sbale_idx)
|
|
{
|
|
return &q->sbal[sbal_idx]->element[sbale_idx];
|
|
}
|
|
|
|
/**
|
|
* zfcp_qdio_sbale_req - return pointer to sbale on req_q for a request
|
|
* @qdio: pointer to struct zfcp_qdio
|
|
* @q_rec: pointer to struct zfcp_qdio_req
|
|
* Returns: pointer to qdio_buffer_element (sbale) structure
|
|
*/
|
|
static inline struct qdio_buffer_element *
|
|
zfcp_qdio_sbale_req(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req)
|
|
{
|
|
return zfcp_qdio_sbale(&qdio->req_q, q_req->sbal_last, 0);
|
|
}
|
|
|
|
/**
|
|
* zfcp_qdio_sbale_curr - return current sbale on req_q for a request
|
|
* @qdio: pointer to struct zfcp_qdio
|
|
* @fsf_req: pointer to struct zfcp_fsf_req
|
|
* Returns: pointer to qdio_buffer_element (sbale) structure
|
|
*/
|
|
static inline struct qdio_buffer_element *
|
|
zfcp_qdio_sbale_curr(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req)
|
|
{
|
|
return zfcp_qdio_sbale(&qdio->req_q, q_req->sbal_last,
|
|
q_req->sbale_curr);
|
|
}
|
|
|
|
/**
|
|
* zfcp_qdio_req_init - initialize qdio request
|
|
* @qdio: request queue where to start putting the request
|
|
* @q_req: the qdio request to start
|
|
* @req_id: The request id
|
|
* @sbtype: type flags to set for all sbals
|
|
* @data: First data block
|
|
* @len: Length of first data block
|
|
*
|
|
* This is the start of putting the request into the queue, the last
|
|
* step is passing the request to zfcp_qdio_send. The request queue
|
|
* lock must be held during the whole process from init to send.
|
|
*/
|
|
static inline
|
|
void zfcp_qdio_req_init(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req,
|
|
unsigned long req_id, u32 sbtype, void *data, u32 len)
|
|
{
|
|
struct qdio_buffer_element *sbale;
|
|
|
|
q_req->sbal_first = q_req->sbal_last = qdio->req_q.first;
|
|
q_req->sbal_number = 1;
|
|
q_req->sbtype = sbtype;
|
|
|
|
sbale = zfcp_qdio_sbale_req(qdio, q_req);
|
|
sbale->addr = (void *) req_id;
|
|
sbale->flags |= SBAL_FLAGS0_COMMAND;
|
|
sbale->flags |= sbtype;
|
|
|
|
q_req->sbale_curr = 1;
|
|
sbale++;
|
|
sbale->addr = data;
|
|
if (likely(data))
|
|
sbale->length = len;
|
|
}
|
|
|
|
/**
|
|
* zfcp_qdio_fill_next - Fill next sbale, only for single sbal requests
|
|
* @qdio: pointer to struct zfcp_qdio
|
|
* @q_req: pointer to struct zfcp_queue_req
|
|
*
|
|
* This is only required for single sbal requests, calling it when
|
|
* wrapping around to the next sbal is a bug.
|
|
*/
|
|
static inline
|
|
void zfcp_qdio_fill_next(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req,
|
|
void *data, u32 len)
|
|
{
|
|
struct qdio_buffer_element *sbale;
|
|
|
|
BUG_ON(q_req->sbale_curr == ZFCP_QDIO_LAST_SBALE_PER_SBAL);
|
|
q_req->sbale_curr++;
|
|
sbale = zfcp_qdio_sbale_curr(qdio, q_req);
|
|
sbale->addr = data;
|
|
sbale->length = len;
|
|
}
|
|
|
|
/**
|
|
* zfcp_qdio_set_sbale_last - set last entry flag in current sbale
|
|
* @qdio: pointer to struct zfcp_qdio
|
|
* @q_req: pointer to struct zfcp_queue_req
|
|
*/
|
|
static inline
|
|
void zfcp_qdio_set_sbale_last(struct zfcp_qdio *qdio,
|
|
struct zfcp_qdio_req *q_req)
|
|
{
|
|
struct qdio_buffer_element *sbale;
|
|
|
|
sbale = zfcp_qdio_sbale_curr(qdio, q_req);
|
|
sbale->flags |= SBAL_FLAGS_LAST_ENTRY;
|
|
}
|
|
|
|
/**
|
|
* zfcp_qdio_sg_one_sbal - check if one sbale is enough for sg data
|
|
* @sg: The scatterlist where to check the data size
|
|
*
|
|
* Returns: 1 when one sbale is enough for the data in the scatterlist,
|
|
* 0 if not.
|
|
*/
|
|
static inline
|
|
int zfcp_qdio_sg_one_sbale(struct scatterlist *sg)
|
|
{
|
|
return sg_is_last(sg) && sg->length <= ZFCP_QDIO_SBALE_LEN;
|
|
}
|
|
|
|
/**
|
|
* zfcp_qdio_skip_to_last_sbale - skip to last sbale in sbal
|
|
* @q_req: The current zfcp_qdio_req
|
|
*/
|
|
static inline
|
|
void zfcp_qdio_skip_to_last_sbale(struct zfcp_qdio_req *q_req)
|
|
{
|
|
q_req->sbale_curr = ZFCP_QDIO_LAST_SBALE_PER_SBAL;
|
|
}
|
|
|
|
#endif /* ZFCP_QDIO_H */
|