forked from luck/tmp_suning_uos_patched
1674b40547
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
/*
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* zfcp device driver
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*
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* Header file for zfcp qdio interface
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*
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* Copyright IBM Corporation 2010
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*/
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#ifndef ZFCP_QDIO_H
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#define ZFCP_QDIO_H
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#include <asm/qdio.h>
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#define ZFCP_QDIO_SBALE_LEN PAGE_SIZE
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/* DMQ bug workaround: don't use last SBALE */
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#define ZFCP_QDIO_MAX_SBALES_PER_SBAL (QDIO_MAX_ELEMENTS_PER_BUFFER - 1)
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/* index of last SBALE (with respect to DMQ bug workaround) */
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#define ZFCP_QDIO_LAST_SBALE_PER_SBAL (ZFCP_QDIO_MAX_SBALES_PER_SBAL - 1)
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/**
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* struct zfcp_qdio_queue - qdio queue buffer, zfcp index and free count
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* @sbal: qdio buffers
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* @first: index of next free buffer in queue
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* @count: number of free buffers in queue
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*/
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struct zfcp_qdio_queue {
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struct qdio_buffer *sbal[QDIO_MAX_BUFFERS_PER_Q];
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u8 first;
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atomic_t count;
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};
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/**
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* struct zfcp_qdio - basic qdio data structure
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* @resp_q: response queue
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* @req_q: request queue
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* @stat_lock: lock to protect req_q_util and req_q_time
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* @req_q_lock: lock to serialize access to request queue
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* @req_q_time: time of last fill level change
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* @req_q_util: used for accounting
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* @req_q_full: queue full incidents
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* @req_q_wq: used to wait for SBAL availability
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* @adapter: adapter used in conjunction with this qdio structure
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*/
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struct zfcp_qdio {
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struct zfcp_qdio_queue resp_q;
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struct zfcp_qdio_queue req_q;
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spinlock_t stat_lock;
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spinlock_t req_q_lock;
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unsigned long long req_q_time;
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u64 req_q_util;
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atomic_t req_q_full;
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wait_queue_head_t req_q_wq;
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struct zfcp_adapter *adapter;
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};
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/**
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* struct zfcp_qdio_req - qdio queue related values for a request
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* @sbtype: sbal type flags for sbale 0
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* @sbal_number: number of free sbals
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* @sbal_first: first sbal for this request
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* @sbal_last: last sbal for this request
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* @sbal_limit: last possible sbal for this request
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* @sbale_curr: current sbale at creation of this request
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* @sbal_response: sbal used in interrupt
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* @qdio_outb_usage: usage of outbound queue
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* @qdio_inb_usage: usage of inbound queue
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*/
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struct zfcp_qdio_req {
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u32 sbtype;
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u8 sbal_number;
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u8 sbal_first;
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u8 sbal_last;
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u8 sbal_limit;
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u8 sbale_curr;
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u8 sbal_response;
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u16 qdio_outb_usage;
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u16 qdio_inb_usage;
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};
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/**
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* zfcp_qdio_sbale - return pointer to sbale in qdio queue
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* @q: queue where to find sbal
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* @sbal_idx: sbal index in queue
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* @sbale_idx: sbale index in sbal
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*/
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static inline struct qdio_buffer_element *
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zfcp_qdio_sbale(struct zfcp_qdio_queue *q, int sbal_idx, int sbale_idx)
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{
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return &q->sbal[sbal_idx]->element[sbale_idx];
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}
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/**
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* zfcp_qdio_sbale_req - return pointer to sbale on req_q for a request
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* @qdio: pointer to struct zfcp_qdio
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* @q_rec: pointer to struct zfcp_qdio_req
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* Returns: pointer to qdio_buffer_element (sbale) structure
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*/
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static inline struct qdio_buffer_element *
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zfcp_qdio_sbale_req(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req)
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{
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return zfcp_qdio_sbale(&qdio->req_q, q_req->sbal_last, 0);
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}
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/**
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* zfcp_qdio_sbale_curr - return current sbale on req_q for a request
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* @qdio: pointer to struct zfcp_qdio
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* @fsf_req: pointer to struct zfcp_fsf_req
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* Returns: pointer to qdio_buffer_element (sbale) structure
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*/
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static inline struct qdio_buffer_element *
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zfcp_qdio_sbale_curr(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req)
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{
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return zfcp_qdio_sbale(&qdio->req_q, q_req->sbal_last,
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q_req->sbale_curr);
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}
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/**
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* zfcp_qdio_req_init - initialize qdio request
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* @qdio: request queue where to start putting the request
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* @q_req: the qdio request to start
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* @req_id: The request id
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* @sbtype: type flags to set for all sbals
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* @data: First data block
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* @len: Length of first data block
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*
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* This is the start of putting the request into the queue, the last
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* step is passing the request to zfcp_qdio_send. The request queue
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* lock must be held during the whole process from init to send.
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*/
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static inline
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void zfcp_qdio_req_init(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req,
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unsigned long req_id, u32 sbtype, void *data, u32 len)
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{
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struct qdio_buffer_element *sbale;
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q_req->sbal_first = q_req->sbal_last = qdio->req_q.first;
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q_req->sbal_number = 1;
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q_req->sbtype = sbtype;
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sbale = zfcp_qdio_sbale_req(qdio, q_req);
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sbale->addr = (void *) req_id;
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sbale->flags |= SBAL_FLAGS0_COMMAND;
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sbale->flags |= sbtype;
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q_req->sbale_curr = 1;
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sbale++;
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sbale->addr = data;
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if (likely(data))
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sbale->length = len;
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}
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/**
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* zfcp_qdio_fill_next - Fill next sbale, only for single sbal requests
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* @qdio: pointer to struct zfcp_qdio
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* @q_req: pointer to struct zfcp_queue_req
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*
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* This is only required for single sbal requests, calling it when
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* wrapping around to the next sbal is a bug.
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*/
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static inline
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void zfcp_qdio_fill_next(struct zfcp_qdio *qdio, struct zfcp_qdio_req *q_req,
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void *data, u32 len)
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{
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struct qdio_buffer_element *sbale;
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BUG_ON(q_req->sbale_curr == ZFCP_QDIO_LAST_SBALE_PER_SBAL);
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q_req->sbale_curr++;
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sbale = zfcp_qdio_sbale_curr(qdio, q_req);
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sbale->addr = data;
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sbale->length = len;
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}
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/**
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* zfcp_qdio_set_sbale_last - set last entry flag in current sbale
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* @qdio: pointer to struct zfcp_qdio
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* @q_req: pointer to struct zfcp_queue_req
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*/
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static inline
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void zfcp_qdio_set_sbale_last(struct zfcp_qdio *qdio,
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struct zfcp_qdio_req *q_req)
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{
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struct qdio_buffer_element *sbale;
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sbale = zfcp_qdio_sbale_curr(qdio, q_req);
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sbale->flags |= SBAL_FLAGS_LAST_ENTRY;
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}
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/**
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* zfcp_qdio_sg_one_sbal - check if one sbale is enough for sg data
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* @sg: The scatterlist where to check the data size
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*
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* Returns: 1 when one sbale is enough for the data in the scatterlist,
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* 0 if not.
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*/
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static inline
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int zfcp_qdio_sg_one_sbale(struct scatterlist *sg)
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{
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return sg_is_last(sg) && sg->length <= ZFCP_QDIO_SBALE_LEN;
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}
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/**
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* zfcp_qdio_skip_to_last_sbale - skip to last sbale in sbal
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* @q_req: The current zfcp_qdio_req
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*/
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static inline
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void zfcp_qdio_skip_to_last_sbale(struct zfcp_qdio_req *q_req)
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{
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q_req->sbale_curr = ZFCP_QDIO_LAST_SBALE_PER_SBAL;
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}
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#endif /* ZFCP_QDIO_H */
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