[S390] dasd: optimize cpu usage in goodcase

remove unnecessary dbf call, remove string operations for magic

Signed-off-by: Stefan Haberland <stefan.haberland@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

7 files changed, 41 insertions, 51 deletions

diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c
index f8445b8ff173..e109da4583a8 100644
--- a/drivers/s390/block/dasd.c
+++ b/drivers/s390/block/dasd.c
@@ -669,14 +669,14 @@ static void dasd_profile_end(struct dasd_block *block,
  * memory and 2) dasd_smalloc_request uses the static ccw memory
  * that gets allocated for each device.
  */
-struct dasd_ccw_req *dasd_kmalloc_request(char *magic, int cplength,
+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( magic == NULL || datasize > PAGE_SIZE ||
+        BUG_ON(datasize > PAGE_SIZE ||
              (cplength*sizeof(struct ccw1)) > PAGE_SIZE);
 
         cqr = kzalloc(sizeof(struct dasd_ccw_req), GFP_ATOMIC);
@@ -700,14 +700,13 @@ struct dasd_ccw_req *dasd_kmalloc_request(char *magic, int cplength,
                         return ERR_PTR(-ENOMEM);
                 }
         }
-        strncpy((char *) &cqr->magic, magic, 4);
-        ASCEBC((char *) &cqr->magic, 4);
+        cqr->magic =  magic;
         set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
         dasd_get_device(device);
         return cqr;
 }
 
-struct dasd_ccw_req *dasd_smalloc_request(char *magic, int cplength,
+struct dasd_ccw_req *dasd_smalloc_request(int magic, int cplength,
                                           int datasize,
                                           struct dasd_device *device)
 {
@@ -717,7 +716,7 @@ struct dasd_ccw_req *dasd_smalloc_request(char *magic, int cplength,
         int size;
 
         /* Sanity checks */
-        BUG_ON( magic == NULL || datasize > PAGE_SIZE ||
+        BUG_ON(datasize > PAGE_SIZE ||
              (cplength*sizeof(struct ccw1)) > PAGE_SIZE);
 
         size = (sizeof(struct dasd_ccw_req) + 7L) & -8L;
@@ -744,8 +743,7 @@ struct dasd_ccw_req *dasd_smalloc_request(char *magic, int cplength,
                 cqr->data = data;
                 memset(cqr->data, 0, datasize);
         }
-        strncpy((char *) &cqr->magic, magic, 4);
-        ASCEBC((char *) &cqr->magic, 4);
+        cqr->magic = magic;
         set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
         dasd_get_device(device);
         return cqr;
@@ -899,9 +897,6 @@ int dasd_start_IO(struct dasd_ccw_req *cqr)
         switch (rc) {
         case 0:
                 cqr->status = DASD_CQR_IN_IO;
-                DBF_DEV_EVENT(DBF_DEBUG, device,
-                              "start_IO: request %p started successful",
-                              cqr);
                 break;
         case -EBUSY:
                 DBF_DEV_EVENT(DBF_DEBUG, device, "%s",
@@ -2533,7 +2528,7 @@ EXPORT_SYMBOL_GPL(dasd_generic_restore_device);
 static struct dasd_ccw_req *dasd_generic_build_rdc(struct dasd_device *device,
                                                    void *rdc_buffer,
                                                    int rdc_buffer_size,
-                                                   char *magic)
+                                                   int magic)
 {
         struct dasd_ccw_req *cqr;
         struct ccw1 *ccw;
@@ -2564,7 +2559,7 @@ static struct dasd_ccw_req *dasd_generic_build_rdc(struct dasd_device *device,
 }
 
 
-int dasd_generic_read_dev_chars(struct dasd_device *device, char *magic,
+int dasd_generic_read_dev_chars(struct dasd_device *device, int magic,
                                 void *rdc_buffer, int rdc_buffer_size)
 {
         int ret;
diff --git a/drivers/s390/block/dasd_alias.c b/drivers/s390/block/dasd_alias.c
index 5b7bbc87593b..b9efd09cefef 100644
--- a/drivers/s390/block/dasd_alias.c
+++ b/drivers/s390/block/dasd_alias.c
@@ -379,8 +379,7 @@ static int read_unit_address_configuration(struct dasd_device *device,
         int rc;
         unsigned long flags;
 
-        cqr = dasd_kmalloc_request("ECKD",
-                                   1 /* PSF */  + 1 /* RSSD */ ,
+        cqr = dasd_kmalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
                                    (sizeof(struct dasd_psf_prssd_data)),
                                    device);
         if (IS_ERR(cqr))
diff --git a/drivers/s390/block/dasd_diag.c b/drivers/s390/block/dasd_diag.c
index 644086ba2ede..0b89796080be 100644
--- a/drivers/s390/block/dasd_diag.c
+++ b/drivers/s390/block/dasd_diag.c
@@ -523,8 +523,7 @@ static struct dasd_ccw_req *dasd_diag_build_cp(struct dasd_device *memdev,
         /* Build the request */
         datasize = sizeof(struct dasd_diag_req) +
                 count*sizeof(struct dasd_diag_bio);
-        cqr = dasd_smalloc_request(dasd_diag_discipline.name, 0,
-                                   datasize, memdev);
+        cqr = dasd_smalloc_request(DASD_DIAG_MAGIC, 0, datasize, memdev);
         if (IS_ERR(cqr))
                 return cqr;
 
diff --git a/drivers/s390/block/dasd_eckd.c b/drivers/s390/block/dasd_eckd.c
index c11770f5b368..f15addf728d7 100644
--- a/drivers/s390/block/dasd_eckd.c
+++ b/drivers/s390/block/dasd_eckd.c
@@ -730,7 +730,8 @@ static struct dasd_ccw_req *dasd_eckd_build_rcd_lpm(struct dasd_device *device,
         struct dasd_ccw_req *cqr;
         struct ccw1 *ccw;
 
-        cqr = dasd_smalloc_request("ECKD", 1 /* RCD */, ciw->count, device);
+        cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* RCD */, ciw->count,
+                                   device);
 
         if (IS_ERR(cqr)) {
                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
@@ -934,8 +935,7 @@ static int dasd_eckd_read_features(struct dasd_device *device)
         struct dasd_eckd_private *private;
 
         private = (struct dasd_eckd_private *) device->private;
-        cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
-                                   1 /* PSF */  + 1 /* RSSD */ ,
+        cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
                                    (sizeof(struct dasd_psf_prssd_data) +
                                     sizeof(struct dasd_rssd_features)),
                                    device);
@@ -998,7 +998,7 @@ static struct dasd_ccw_req *dasd_eckd_build_psf_ssc(struct dasd_device *device,
         struct dasd_psf_ssc_data *psf_ssc_data;
         struct ccw1 *ccw;
 
-        cqr = dasd_smalloc_request("ECKD", 1 /* PSF */ ,
+        cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ ,
                                   sizeof(struct dasd_psf_ssc_data),
                                   device);
 
@@ -1149,8 +1149,8 @@ dasd_eckd_check_characteristics(struct dasd_device *device)
                 goto out_err3;
 
         /* Read Device Characteristics */
-        rc = dasd_generic_read_dev_chars(device, "ECKD", &private->rdc_data,
-                                         64);
+        rc = dasd_generic_read_dev_chars(device, DASD_ECKD_MAGIC,
+                                         &private->rdc_data, 64);
         if (rc) {
                 DBF_EVENT(DBF_WARNING,
                           "Read device characteristics failed, rc=%d for "
@@ -1217,8 +1217,7 @@ dasd_eckd_analysis_ccw(struct dasd_device *device)
 
         cplength = 8;
         datasize = sizeof(struct DE_eckd_data) + 2*sizeof(struct LO_eckd_data);
-        cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
-                                   cplength, datasize, device);
+        cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize, device);
         if (IS_ERR(cqr))
                 return cqr;
         ccw = cqr->cpaddr;
@@ -1499,8 +1498,7 @@ dasd_eckd_format_device(struct dasd_device * device,
                 return ERR_PTR(-EINVAL);
         }
         /* Allocate the format ccw request. */
-        fcp = dasd_smalloc_request(dasd_eckd_discipline.name,
-                                   cplength, datasize, device);
+        fcp = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize, device);
         if (IS_ERR(fcp))
                 return fcp;
 
@@ -1783,8 +1781,8 @@ static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_single(
                 datasize += count*sizeof(struct LO_eckd_data);
         }
         /* Allocate the ccw request. */
-        cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
-                                   cplength, datasize, startdev);
+        cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
+                                   startdev);
         if (IS_ERR(cqr))
                 return cqr;
         ccw = cqr->cpaddr;
@@ -1948,8 +1946,8 @@ static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_track(
                 cidaw * sizeof(unsigned long long);
 
         /* Allocate the ccw request. */
-        cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
-                                   cplength, datasize, startdev);
+        cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
+                                   startdev);
         if (IS_ERR(cqr))
                 return cqr;
         ccw = cqr->cpaddr;
@@ -2249,8 +2247,7 @@ static struct dasd_ccw_req *dasd_eckd_build_cp_tpm_track(
 
         /* Allocate the ccw request. */
         itcw_size = itcw_calc_size(0, ctidaw, 0);
-        cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
-                                   0, itcw_size, startdev);
+        cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 0, itcw_size, startdev);
         if (IS_ERR(cqr))
                 return cqr;
 
@@ -2557,8 +2554,7 @@ dasd_eckd_release(struct dasd_device *device)
         if (!capable(CAP_SYS_ADMIN))
                 return -EACCES;
 
-        cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
-                                   1, 32, device);
+        cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
         if (IS_ERR(cqr)) {
                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
                             "Could not allocate initialization request");
@@ -2600,8 +2596,7 @@ dasd_eckd_reserve(struct dasd_device *device)
         if (!capable(CAP_SYS_ADMIN))
                 return -EACCES;
 
-        cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
-                                   1, 32, device);
+        cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
         if (IS_ERR(cqr)) {
                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
                             "Could not allocate initialization request");
@@ -2642,8 +2637,7 @@ dasd_eckd_steal_lock(struct dasd_device *device)
         if (!capable(CAP_SYS_ADMIN))
                 return -EACCES;
 
-        cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
-                                   1, 32, device);
+        cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
         if (IS_ERR(cqr)) {
                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
                             "Could not allocate initialization request");
@@ -2681,8 +2675,7 @@ dasd_eckd_performance(struct dasd_device *device, void __user *argp)
         struct ccw1 *ccw;
         int rc;
 
-        cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
-                                   1 /* PSF */  + 1 /* RSSD */ ,
+        cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */  + 1 /* RSSD */,
                                    (sizeof(struct dasd_psf_prssd_data) +
                                     sizeof(struct dasd_rssd_perf_stats_t)),
                                    device);
@@ -2828,7 +2821,7 @@ static int dasd_symm_io(struct dasd_device *device, void __user *argp)
         }
 
         /* setup CCWs for PSF + RSSD */
-        cqr = dasd_smalloc_request("ECKD", 2 , 0, device);
+        cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 2 , 0, device);
         if (IS_ERR(cqr)) {
                 DBF_DEV_EVENT(DBF_WARNING, device, "%s",
                         "Could not allocate initialization request");
@@ -3254,7 +3247,7 @@ int dasd_eckd_restore_device(struct dasd_device *device)
 
         /* Read Device Characteristics */
         memset(&private->rdc_data, 0, sizeof(private->rdc_data));
-        rc = dasd_generic_read_dev_chars(device, "ECKD",
+        rc = dasd_generic_read_dev_chars(device, DASD_ECKD_MAGIC,
                                          &private->rdc_data, 64);
         if (rc) {
                 DBF_EVENT(DBF_WARNING,
diff --git a/drivers/s390/block/dasd_eer.c b/drivers/s390/block/dasd_eer.c
index c24c8c30380d..6bd2bd54f225 100644
--- a/drivers/s390/block/dasd_eer.c
+++ b/drivers/s390/block/dasd_eer.c
@@ -464,7 +464,7 @@ int dasd_eer_enable(struct dasd_device *device)
         if (!device->discipline || strcmp(device->discipline->name, "ECKD"))
                 return -EPERM;  /* FIXME: -EMEDIUMTYPE ? */
 
-        cqr = dasd_kmalloc_request("ECKD", 1 /* SNSS */,
+        cqr = dasd_kmalloc_request(DASD_ECKD_MAGIC, 1 /* SNSS */,
                                    SNSS_DATA_SIZE, device);
         if (IS_ERR(cqr))
                 return -ENOMEM;
diff --git a/drivers/s390/block/dasd_fba.c b/drivers/s390/block/dasd_fba.c
index 31849ad5e59f..403730cfaf8e 100644
--- a/drivers/s390/block/dasd_fba.c
+++ b/drivers/s390/block/dasd_fba.c
@@ -152,8 +152,8 @@ dasd_fba_check_characteristics(struct dasd_device *device)
         block->base = device;
 
         /* Read Device Characteristics */
-        rc = dasd_generic_read_dev_chars(device, "FBA ", &private->rdc_data,
-                                         32);
+        rc = dasd_generic_read_dev_chars(device, DASD_FBA_MAGIC,
+                                         &private->rdc_data, 32);
         if (rc) {
                 DBF_EVENT(DBF_WARNING, "Read device characteristics returned "
                           "error %d for device: %s",
@@ -305,8 +305,7 @@ static struct dasd_ccw_req *dasd_fba_build_cp(struct dasd_device * memdev,
                 datasize += (count - 1)*sizeof(struct LO_fba_data);
         }
         /* Allocate the ccw request. */
-        cqr = dasd_smalloc_request(dasd_fba_discipline.name,
-                                   cplength, datasize, memdev);
+        cqr = dasd_smalloc_request(DASD_FBA_MAGIC, cplength, datasize, memdev);
         if (IS_ERR(cqr))
                 return cqr;
         ccw = cqr->cpaddr;
diff --git a/drivers/s390/block/dasd_int.h b/drivers/s390/block/dasd_int.h
index b699ca356ac5..5e47a1ee52b9 100644
--- a/drivers/s390/block/dasd_int.h
+++ b/drivers/s390/block/dasd_int.h
@@ -59,6 +59,11 @@
 #include <asm/dasd.h>
 #include <asm/idals.h>
 
+/* DASD discipline magic */
+#define DASD_ECKD_MAGIC 0xC5C3D2C4
+#define DASD_DIAG_MAGIC 0xC4C9C1C7
+#define DASD_FBA_MAGIC 0xC6C2C140
+
 /*
  * SECTION: Type definitions
  */
@@ -540,9 +545,9 @@ extern struct block_device_operations dasd_device_operations;
 extern struct kmem_cache *dasd_page_cache;
 
 struct dasd_ccw_req *
-dasd_kmalloc_request(char *, int, int, struct dasd_device *);
+dasd_kmalloc_request(int , int, int, struct dasd_device *);
 struct dasd_ccw_req *
-dasd_smalloc_request(char *, int, int, struct dasd_device *);
+dasd_smalloc_request(int , int, int, struct dasd_device *);
 void dasd_kfree_request(struct dasd_ccw_req *, struct dasd_device *);
 void dasd_sfree_request(struct dasd_ccw_req *, struct dasd_device *);
 
@@ -587,7 +592,7 @@ void dasd_generic_handle_state_change(struct dasd_device *);
 int dasd_generic_pm_freeze(struct ccw_device *);
 int dasd_generic_restore_device(struct ccw_device *);
 
-int dasd_generic_read_dev_chars(struct dasd_device *, char *, void *, int);
+int dasd_generic_read_dev_chars(struct dasd_device *, int, void *, int);
 char *dasd_get_sense(struct irb *);
 
 /* externals in dasd_devmap.c */