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https://github.com/FEX-Emu/linux.git
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[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>
This commit is contained in:
parent
97f604b074
commit
68b781fe1b
drivers/s390/block
@ -669,14 +669,14 @@ static void dasd_profile_end(struct dasd_block *block,
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* memory and 2) dasd_smalloc_request uses the static ccw memory
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* that gets allocated for each device.
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*/
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struct dasd_ccw_req *dasd_kmalloc_request(char *magic, int cplength,
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struct dasd_ccw_req *dasd_kmalloc_request(int magic, int cplength,
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int datasize,
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struct dasd_device *device)
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{
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struct dasd_ccw_req *cqr;
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/* Sanity checks */
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BUG_ON( magic == NULL || datasize > PAGE_SIZE ||
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BUG_ON(datasize > PAGE_SIZE ||
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(cplength*sizeof(struct ccw1)) > PAGE_SIZE);
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cqr = kzalloc(sizeof(struct dasd_ccw_req), GFP_ATOMIC);
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@ -700,14 +700,13 @@ struct dasd_ccw_req *dasd_kmalloc_request(char *magic, int cplength,
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return ERR_PTR(-ENOMEM);
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}
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}
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strncpy((char *) &cqr->magic, magic, 4);
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ASCEBC((char *) &cqr->magic, 4);
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cqr->magic = magic;
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set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
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dasd_get_device(device);
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return cqr;
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}
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struct dasd_ccw_req *dasd_smalloc_request(char *magic, int cplength,
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struct dasd_ccw_req *dasd_smalloc_request(int magic, int cplength,
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int datasize,
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struct dasd_device *device)
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{
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@ -717,7 +716,7 @@ struct dasd_ccw_req *dasd_smalloc_request(char *magic, int cplength,
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int size;
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/* Sanity checks */
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BUG_ON( magic == NULL || datasize > PAGE_SIZE ||
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BUG_ON(datasize > PAGE_SIZE ||
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(cplength*sizeof(struct ccw1)) > PAGE_SIZE);
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size = (sizeof(struct dasd_ccw_req) + 7L) & -8L;
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@ -744,8 +743,7 @@ struct dasd_ccw_req *dasd_smalloc_request(char *magic, int cplength,
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cqr->data = data;
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memset(cqr->data, 0, datasize);
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}
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strncpy((char *) &cqr->magic, magic, 4);
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ASCEBC((char *) &cqr->magic, 4);
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cqr->magic = magic;
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set_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
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dasd_get_device(device);
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return cqr;
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@ -899,9 +897,6 @@ int dasd_start_IO(struct dasd_ccw_req *cqr)
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switch (rc) {
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case 0:
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cqr->status = DASD_CQR_IN_IO;
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DBF_DEV_EVENT(DBF_DEBUG, device,
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"start_IO: request %p started successful",
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cqr);
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break;
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case -EBUSY:
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DBF_DEV_EVENT(DBF_DEBUG, device, "%s",
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@ -2533,7 +2528,7 @@ EXPORT_SYMBOL_GPL(dasd_generic_restore_device);
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static struct dasd_ccw_req *dasd_generic_build_rdc(struct dasd_device *device,
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void *rdc_buffer,
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int rdc_buffer_size,
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char *magic)
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int magic)
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{
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struct dasd_ccw_req *cqr;
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struct ccw1 *ccw;
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@ -2564,7 +2559,7 @@ static struct dasd_ccw_req *dasd_generic_build_rdc(struct dasd_device *device,
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}
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int dasd_generic_read_dev_chars(struct dasd_device *device, char *magic,
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int dasd_generic_read_dev_chars(struct dasd_device *device, int magic,
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void *rdc_buffer, int rdc_buffer_size)
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{
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int ret;
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@ -379,8 +379,7 @@ static int read_unit_address_configuration(struct dasd_device *device,
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int rc;
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unsigned long flags;
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cqr = dasd_kmalloc_request("ECKD",
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1 /* PSF */ + 1 /* RSSD */ ,
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cqr = dasd_kmalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
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(sizeof(struct dasd_psf_prssd_data)),
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device);
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if (IS_ERR(cqr))
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@ -523,8 +523,7 @@ static struct dasd_ccw_req *dasd_diag_build_cp(struct dasd_device *memdev,
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/* Build the request */
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datasize = sizeof(struct dasd_diag_req) +
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count*sizeof(struct dasd_diag_bio);
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cqr = dasd_smalloc_request(dasd_diag_discipline.name, 0,
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datasize, memdev);
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cqr = dasd_smalloc_request(DASD_DIAG_MAGIC, 0, datasize, memdev);
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if (IS_ERR(cqr))
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return cqr;
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@ -730,7 +730,8 @@ static struct dasd_ccw_req *dasd_eckd_build_rcd_lpm(struct dasd_device *device,
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struct dasd_ccw_req *cqr;
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struct ccw1 *ccw;
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cqr = dasd_smalloc_request("ECKD", 1 /* RCD */, ciw->count, device);
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cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* RCD */, ciw->count,
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device);
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if (IS_ERR(cqr)) {
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DBF_DEV_EVENT(DBF_WARNING, device, "%s",
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@ -934,8 +935,7 @@ static int dasd_eckd_read_features(struct dasd_device *device)
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struct dasd_eckd_private *private;
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private = (struct dasd_eckd_private *) device->private;
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cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
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1 /* PSF */ + 1 /* RSSD */ ,
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cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
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(sizeof(struct dasd_psf_prssd_data) +
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sizeof(struct dasd_rssd_features)),
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device);
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@ -998,7 +998,7 @@ static struct dasd_ccw_req *dasd_eckd_build_psf_ssc(struct dasd_device *device,
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struct dasd_psf_ssc_data *psf_ssc_data;
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struct ccw1 *ccw;
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cqr = dasd_smalloc_request("ECKD", 1 /* PSF */ ,
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cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ ,
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sizeof(struct dasd_psf_ssc_data),
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device);
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@ -1149,8 +1149,8 @@ dasd_eckd_check_characteristics(struct dasd_device *device)
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goto out_err3;
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/* Read Device Characteristics */
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rc = dasd_generic_read_dev_chars(device, "ECKD", &private->rdc_data,
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64);
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rc = dasd_generic_read_dev_chars(device, DASD_ECKD_MAGIC,
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&private->rdc_data, 64);
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if (rc) {
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DBF_EVENT(DBF_WARNING,
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"Read device characteristics failed, rc=%d for "
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@ -1217,8 +1217,7 @@ dasd_eckd_analysis_ccw(struct dasd_device *device)
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cplength = 8;
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datasize = sizeof(struct DE_eckd_data) + 2*sizeof(struct LO_eckd_data);
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cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
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cplength, datasize, device);
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cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize, device);
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if (IS_ERR(cqr))
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return cqr;
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ccw = cqr->cpaddr;
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@ -1499,8 +1498,7 @@ dasd_eckd_format_device(struct dasd_device * device,
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return ERR_PTR(-EINVAL);
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}
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/* Allocate the format ccw request. */
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fcp = dasd_smalloc_request(dasd_eckd_discipline.name,
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cplength, datasize, device);
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fcp = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize, device);
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if (IS_ERR(fcp))
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return fcp;
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@ -1783,8 +1781,8 @@ static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_single(
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datasize += count*sizeof(struct LO_eckd_data);
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}
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/* Allocate the ccw request. */
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cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
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cplength, datasize, startdev);
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cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
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startdev);
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if (IS_ERR(cqr))
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return cqr;
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ccw = cqr->cpaddr;
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@ -1948,8 +1946,8 @@ static struct dasd_ccw_req *dasd_eckd_build_cp_cmd_track(
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cidaw * sizeof(unsigned long long);
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/* Allocate the ccw request. */
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cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
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cplength, datasize, startdev);
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cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, cplength, datasize,
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startdev);
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if (IS_ERR(cqr))
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return cqr;
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ccw = cqr->cpaddr;
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@ -2249,8 +2247,7 @@ static struct dasd_ccw_req *dasd_eckd_build_cp_tpm_track(
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/* Allocate the ccw request. */
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itcw_size = itcw_calc_size(0, ctidaw, 0);
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cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
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0, itcw_size, startdev);
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cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 0, itcw_size, startdev);
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if (IS_ERR(cqr))
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return cqr;
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@ -2557,8 +2554,7 @@ dasd_eckd_release(struct dasd_device *device)
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if (!capable(CAP_SYS_ADMIN))
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return -EACCES;
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cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
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1, 32, device);
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cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
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if (IS_ERR(cqr)) {
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DBF_DEV_EVENT(DBF_WARNING, device, "%s",
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"Could not allocate initialization request");
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@ -2600,8 +2596,7 @@ dasd_eckd_reserve(struct dasd_device *device)
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if (!capable(CAP_SYS_ADMIN))
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return -EACCES;
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cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
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1, 32, device);
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cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
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if (IS_ERR(cqr)) {
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DBF_DEV_EVENT(DBF_WARNING, device, "%s",
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"Could not allocate initialization request");
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@ -2642,8 +2637,7 @@ dasd_eckd_steal_lock(struct dasd_device *device)
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if (!capable(CAP_SYS_ADMIN))
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return -EACCES;
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cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
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1, 32, device);
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cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1, 32, device);
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if (IS_ERR(cqr)) {
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DBF_DEV_EVENT(DBF_WARNING, device, "%s",
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"Could not allocate initialization request");
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@ -2681,8 +2675,7 @@ dasd_eckd_performance(struct dasd_device *device, void __user *argp)
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struct ccw1 *ccw;
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int rc;
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cqr = dasd_smalloc_request(dasd_eckd_discipline.name,
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1 /* PSF */ + 1 /* RSSD */ ,
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cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 1 /* PSF */ + 1 /* RSSD */,
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(sizeof(struct dasd_psf_prssd_data) +
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sizeof(struct dasd_rssd_perf_stats_t)),
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device);
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@ -2828,7 +2821,7 @@ static int dasd_symm_io(struct dasd_device *device, void __user *argp)
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}
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/* setup CCWs for PSF + RSSD */
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cqr = dasd_smalloc_request("ECKD", 2 , 0, device);
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cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 2 , 0, device);
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if (IS_ERR(cqr)) {
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DBF_DEV_EVENT(DBF_WARNING, device, "%s",
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"Could not allocate initialization request");
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@ -3254,7 +3247,7 @@ int dasd_eckd_restore_device(struct dasd_device *device)
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/* Read Device Characteristics */
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memset(&private->rdc_data, 0, sizeof(private->rdc_data));
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rc = dasd_generic_read_dev_chars(device, "ECKD",
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rc = dasd_generic_read_dev_chars(device, DASD_ECKD_MAGIC,
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&private->rdc_data, 64);
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if (rc) {
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DBF_EVENT(DBF_WARNING,
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@ -464,7 +464,7 @@ int dasd_eer_enable(struct dasd_device *device)
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if (!device->discipline || strcmp(device->discipline->name, "ECKD"))
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return -EPERM; /* FIXME: -EMEDIUMTYPE ? */
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cqr = dasd_kmalloc_request("ECKD", 1 /* SNSS */,
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cqr = dasd_kmalloc_request(DASD_ECKD_MAGIC, 1 /* SNSS */,
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SNSS_DATA_SIZE, device);
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if (IS_ERR(cqr))
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return -ENOMEM;
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@ -152,8 +152,8 @@ dasd_fba_check_characteristics(struct dasd_device *device)
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block->base = device;
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/* Read Device Characteristics */
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rc = dasd_generic_read_dev_chars(device, "FBA ", &private->rdc_data,
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32);
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rc = dasd_generic_read_dev_chars(device, DASD_FBA_MAGIC,
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&private->rdc_data, 32);
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if (rc) {
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DBF_EVENT(DBF_WARNING, "Read device characteristics returned "
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"error %d for device: %s",
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@ -305,8 +305,7 @@ static struct dasd_ccw_req *dasd_fba_build_cp(struct dasd_device * memdev,
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datasize += (count - 1)*sizeof(struct LO_fba_data);
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}
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/* Allocate the ccw request. */
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cqr = dasd_smalloc_request(dasd_fba_discipline.name,
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cplength, datasize, memdev);
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cqr = dasd_smalloc_request(DASD_FBA_MAGIC, cplength, datasize, memdev);
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if (IS_ERR(cqr))
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return cqr;
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ccw = cqr->cpaddr;
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@ -59,6 +59,11 @@
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#include <asm/dasd.h>
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#include <asm/idals.h>
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/* DASD discipline magic */
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#define DASD_ECKD_MAGIC 0xC5C3D2C4
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#define DASD_DIAG_MAGIC 0xC4C9C1C7
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#define DASD_FBA_MAGIC 0xC6C2C140
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/*
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* SECTION: Type definitions
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*/
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@ -540,9 +545,9 @@ extern struct block_device_operations dasd_device_operations;
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extern struct kmem_cache *dasd_page_cache;
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struct dasd_ccw_req *
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dasd_kmalloc_request(char *, int, int, struct dasd_device *);
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dasd_kmalloc_request(int , int, int, struct dasd_device *);
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struct dasd_ccw_req *
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dasd_smalloc_request(char *, int, int, struct dasd_device *);
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dasd_smalloc_request(int , int, int, struct dasd_device *);
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void dasd_kfree_request(struct dasd_ccw_req *, struct dasd_device *);
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void dasd_sfree_request(struct dasd_ccw_req *, struct dasd_device *);
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@ -587,7 +592,7 @@ void dasd_generic_handle_state_change(struct dasd_device *);
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int dasd_generic_pm_freeze(struct ccw_device *);
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int dasd_generic_restore_device(struct ccw_device *);
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int dasd_generic_read_dev_chars(struct dasd_device *, char *, void *, int);
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int dasd_generic_read_dev_chars(struct dasd_device *, int, void *, int);
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char *dasd_get_sense(struct irb *);
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/* externals in dasd_devmap.c */
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