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path: root/drivers/s390/block/dasd.c
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Diffstat (limited to 'drivers/s390/block/dasd.c')
-rw-r--r--drivers/s390/block/dasd.c184
1 files changed, 67 insertions, 117 deletions
diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c
index 73cce3ecb97f..a9f60d0ee02e 100644
--- a/drivers/s390/block/dasd.c
+++ b/drivers/s390/block/dasd.c
@@ -41,6 +41,15 @@
#define DASD_DIAG_MOD "dasd_diag_mod"
+static unsigned int queue_depth = 32;
+static unsigned int nr_hw_queues = 4;
+
+module_param(queue_depth, uint, 0444);
+MODULE_PARM_DESC(queue_depth, "Default queue depth for new DASD devices");
+
+module_param(nr_hw_queues, uint, 0444);
+MODULE_PARM_DESC(nr_hw_queues, "Default number of hardware queues for new DASD devices");
+
/*
* SECTION: exported variables of dasd.c
*/
@@ -1222,80 +1231,37 @@ static void dasd_hosts_init(struct dentry *base_dentry,
device->hosts_dentry = pde;
}
-/*
- * Allocate memory for a channel program with 'cplength' channel
- * command words and 'datasize' additional space. There are two
- * variantes: 1) dasd_kmalloc_request uses kmalloc to get the needed
- * memory and 2) dasd_smalloc_request uses the static ccw memory
- * that gets allocated for each device.
- */
-struct dasd_ccw_req *dasd_kmalloc_request(int magic, int cplength,
- int datasize,
- struct dasd_device *device)
-{
- struct dasd_ccw_req *cqr;
-
- /* Sanity checks */
- BUG_ON(datasize > PAGE_SIZE ||
- (cplength*sizeof(struct ccw1)) > PAGE_SIZE);
-
- cqr = kzalloc(sizeof(struct dasd_ccw_req), GFP_ATOMIC);
- if (cqr == NULL)
- return ERR_PTR(-ENOMEM);
- cqr->cpaddr = NULL;
- if (cplength > 0) {
- cqr->cpaddr = kcalloc(cplength, sizeof(struct ccw1),
- GFP_ATOMIC | GFP_DMA);
- if (cqr->cpaddr == NULL) {
- kfree(cqr);
- return ERR_PTR(-ENOMEM);
- }
- }
- cqr->data = NULL;
- if (datasize > 0) {
- cqr->data = kzalloc(datasize, GFP_ATOMIC | GFP_DMA);
- if (cqr->data == NULL) {
- kfree(cqr->cpaddr);
- kfree(cqr);
- return ERR_PTR(-ENOMEM);
- }
- }
- cqr->magic = magic;
- set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
- dasd_get_device(device);
- return cqr;
-}
-EXPORT_SYMBOL(dasd_kmalloc_request);
-
-struct dasd_ccw_req *dasd_smalloc_request(int magic, int cplength,
- int datasize,
- struct dasd_device *device)
+struct dasd_ccw_req *dasd_smalloc_request(int magic, int cplength, int datasize,
+ struct dasd_device *device,
+ struct dasd_ccw_req *cqr)
{
unsigned long flags;
- struct dasd_ccw_req *cqr;
- char *data;
- int size;
+ char *data, *chunk;
+ int size = 0;
- size = (sizeof(struct dasd_ccw_req) + 7L) & -8L;
if (cplength > 0)
size += cplength * sizeof(struct ccw1);
if (datasize > 0)
size += datasize;
+ if (!cqr)
+ size += (sizeof(*cqr) + 7L) & -8L;
+
spin_lock_irqsave(&device->mem_lock, flags);
- cqr = (struct dasd_ccw_req *)
- dasd_alloc_chunk(&device->ccw_chunks, size);
+ data = chunk = dasd_alloc_chunk(&device->ccw_chunks, size);
spin_unlock_irqrestore(&device->mem_lock, flags);
- if (cqr == NULL)
+ if (!chunk)
return ERR_PTR(-ENOMEM);
- memset(cqr, 0, sizeof(struct dasd_ccw_req));
- data = (char *) cqr + ((sizeof(struct dasd_ccw_req) + 7L) & -8L);
- cqr->cpaddr = NULL;
+ if (!cqr) {
+ cqr = (void *) data;
+ data += (sizeof(*cqr) + 7L) & -8L;
+ }
+ memset(cqr, 0, sizeof(*cqr));
+ cqr->mem_chunk = chunk;
if (cplength > 0) {
- cqr->cpaddr = (struct ccw1 *) data;
- data += cplength*sizeof(struct ccw1);
- memset(cqr->cpaddr, 0, cplength*sizeof(struct ccw1));
+ cqr->cpaddr = data;
+ data += cplength * sizeof(struct ccw1);
+ memset(cqr->cpaddr, 0, cplength * sizeof(struct ccw1));
}
- cqr->data = NULL;
if (datasize > 0) {
cqr->data = data;
memset(cqr->data, 0, datasize);
@@ -1307,33 +1273,12 @@ struct dasd_ccw_req *dasd_smalloc_request(int magic, int cplength,
}
EXPORT_SYMBOL(dasd_smalloc_request);
-/*
- * Free memory of a channel program. This function needs to free all the
- * idal lists that might have been created by dasd_set_cda and the
- * struct dasd_ccw_req itself.
- */
-void dasd_kfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device)
-{
- struct ccw1 *ccw;
-
- /* Clear any idals used for the request. */
- ccw = cqr->cpaddr;
- do {
- clear_normalized_cda(ccw);
- } while (ccw++->flags & (CCW_FLAG_CC | CCW_FLAG_DC));
- kfree(cqr->cpaddr);
- kfree(cqr->data);
- kfree(cqr);
- dasd_put_device(device);
-}
-EXPORT_SYMBOL(dasd_kfree_request);
-
void dasd_sfree_request(struct dasd_ccw_req *cqr, struct dasd_device *device)
{
unsigned long flags;
spin_lock_irqsave(&device->mem_lock, flags);
- dasd_free_chunk(&device->ccw_chunks, cqr);
+ dasd_free_chunk(&device->ccw_chunks, cqr->mem_chunk);
spin_unlock_irqrestore(&device->mem_lock, flags);
dasd_put_device(device);
}
@@ -1885,6 +1830,33 @@ static void __dasd_device_process_ccw_queue(struct dasd_device *device,
}
}
+static void __dasd_process_cqr(struct dasd_device *device,
+ struct dasd_ccw_req *cqr)
+{
+ char errorstring[ERRORLENGTH];
+
+ switch (cqr->status) {
+ case DASD_CQR_SUCCESS:
+ cqr->status = DASD_CQR_DONE;
+ break;
+ case DASD_CQR_ERROR:
+ cqr->status = DASD_CQR_NEED_ERP;
+ break;
+ case DASD_CQR_CLEARED:
+ cqr->status = DASD_CQR_TERMINATED;
+ break;
+ default:
+ /* internal error 12 - wrong cqr status*/
+ snprintf(errorstring, ERRORLENGTH, "12 %p %x02", cqr, cqr->status);
+ dev_err(&device->cdev->dev,
+ "An error occurred in the DASD device driver, "
+ "reason=%s\n", errorstring);
+ BUG();
+ }
+ if (cqr->callback)
+ cqr->callback(cqr, cqr->callback_data);
+}
+
/*
* the cqrs from the final queue are returned to the upper layer
* by setting a dasd_block state and calling the callback function
@@ -1895,40 +1867,18 @@ static void __dasd_device_process_final_queue(struct dasd_device *device,
struct list_head *l, *n;
struct dasd_ccw_req *cqr;
struct dasd_block *block;
- void (*callback)(struct dasd_ccw_req *, void *data);
- void *callback_data;
- char errorstring[ERRORLENGTH];
list_for_each_safe(l, n, final_queue) {
cqr = list_entry(l, struct dasd_ccw_req, devlist);
list_del_init(&cqr->devlist);
block = cqr->block;
- callback = cqr->callback;
- callback_data = cqr->callback_data;
- if (block)
+ if (!block) {
+ __dasd_process_cqr(device, cqr);
+ } else {
spin_lock_bh(&block->queue_lock);
- switch (cqr->status) {
- case DASD_CQR_SUCCESS:
- cqr->status = DASD_CQR_DONE;
- break;
- case DASD_CQR_ERROR:
- cqr->status = DASD_CQR_NEED_ERP;
- break;
- case DASD_CQR_CLEARED:
- cqr->status = DASD_CQR_TERMINATED;
- break;
- default:
- /* internal error 12 - wrong cqr status*/
- snprintf(errorstring, ERRORLENGTH, "12 %p %x02", cqr, cqr->status);
- dev_err(&device->cdev->dev,
- "An error occurred in the DASD device driver, "
- "reason=%s\n", errorstring);
- BUG();
- }
- if (cqr->callback != NULL)
- (callback)(cqr, callback_data);
- if (block)
+ __dasd_process_cqr(device, cqr);
spin_unlock_bh(&block->queue_lock);
+ }
}
}
@@ -3041,7 +2991,6 @@ static blk_status_t do_dasd_request(struct blk_mq_hw_ctx *hctx,
cqr->callback_data = req;
cqr->status = DASD_CQR_FILLED;
cqr->dq = dq;
- *((struct dasd_ccw_req **) blk_mq_rq_to_pdu(req)) = cqr;
blk_mq_start_request(req);
spin_lock(&block->queue_lock);
@@ -3072,7 +3021,7 @@ enum blk_eh_timer_return dasd_times_out(struct request *req, bool reserved)
unsigned long flags;
int rc = 0;
- cqr = *((struct dasd_ccw_req **) blk_mq_rq_to_pdu(req));
+ cqr = blk_mq_rq_to_pdu(req);
if (!cqr)
return BLK_EH_DONE;
@@ -3174,9 +3123,9 @@ static int dasd_alloc_queue(struct dasd_block *block)
int rc;
block->tag_set.ops = &dasd_mq_ops;
- block->tag_set.cmd_size = sizeof(struct dasd_ccw_req *);
- block->tag_set.nr_hw_queues = DASD_NR_HW_QUEUES;
- block->tag_set.queue_depth = DASD_MAX_LCU_DEV * DASD_REQ_PER_DEV;
+ block->tag_set.cmd_size = sizeof(struct dasd_ccw_req);
+ block->tag_set.nr_hw_queues = nr_hw_queues;
+ block->tag_set.queue_depth = queue_depth;
block->tag_set.flags = BLK_MQ_F_SHOULD_MERGE;
rc = blk_mq_alloc_tag_set(&block->tag_set);
@@ -4038,7 +3987,8 @@ static struct dasd_ccw_req *dasd_generic_build_rdc(struct dasd_device *device,
struct ccw1 *ccw;
unsigned long *idaw;
- cqr = dasd_smalloc_request(magic, 1 /* RDC */, rdc_buffer_size, device);
+ cqr = dasd_smalloc_request(magic, 1 /* RDC */, rdc_buffer_size, device,
+ NULL);
if (IS_ERR(cqr)) {
/* internal error 13 - Allocating the RDC request failed*/