[S390] dasd: New read device characteristics and read configuration data.

Instead of the deprecated read_dev_chars() and read_conf_data_lpm(),
implement dasd_generic_read_dev_chars() and dasd_eckd_read_conf_lpm().
These should even recover better from error than the original cio
functions.

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

4 files changed, 126 insertions, 4 deletions

diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c
index e71929db8b06..977521013fe8 100644
--- a/drivers/s390/block/dasd.c
+++ b/drivers/s390/block/dasd.c
@@ -2174,6 +2174,51 @@ dasd_generic_notify(struct ccw_device *cdev, int event)
         return ret;
 }
 
+struct dasd_ccw_req * dasd_generic_build_rdc(struct dasd_device *device,
+                                             void *rdc_buffer,
+                                             int rdc_buffer_size, char *magic)
+{
+        struct dasd_ccw_req *cqr;
+        struct ccw1 *ccw;
+
+        cqr = dasd_smalloc_request(magic, 1 /* RDC */, rdc_buffer_size, device);
+
+        if (IS_ERR(cqr)) {
+                DEV_MESSAGE(KERN_WARNING, device, "%s",
+                            "Could not allocate RDC request");
+                return cqr;
+        }
+
+        ccw = cqr->cpaddr;
+        ccw->cmd_code = CCW_CMD_RDC;
+        ccw->cda = (__u32)(addr_t)rdc_buffer;
+        ccw->count = rdc_buffer_size;
+
+        cqr->device = device;
+        cqr->expires = 10*HZ;
+        clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
+        cqr->retries = 2;
+        cqr->buildclk = get_clock();
+        cqr->status = DASD_CQR_FILLED;
+        return cqr;
+}
+
+
+int dasd_generic_read_dev_chars(struct dasd_device *device, char *magic,
+                                void **rdc_buffer, int rdc_buffer_size)
+{
+        int ret;
+        struct dasd_ccw_req *cqr;
+
+        cqr = dasd_generic_build_rdc(device, *rdc_buffer, rdc_buffer_size,
+                                     magic);
+        if (IS_ERR(cqr))
+                return PTR_ERR(cqr);
+
+        ret = dasd_sleep_on(cqr);
+        dasd_sfree_request(cqr, cqr->device);
+        return ret;
+}
 
 static int __init
 dasd_init(void)
diff --git a/drivers/s390/block/dasd_eckd.c b/drivers/s390/block/dasd_eckd.c
index cecab2274a6e..c9583fbc2a7d 100644
--- a/drivers/s390/block/dasd_eckd.c
+++ b/drivers/s390/block/dasd_eckd.c
@@ -450,6 +450,81 @@ dasd_eckd_generate_uid(struct dasd_device *device, struct dasd_uid *uid)
         return 0;
 }
 
+struct dasd_ccw_req * dasd_eckd_build_rcd_lpm(struct dasd_device *device,
+                                              void *rcd_buffer,
+                                              struct ciw *ciw, __u8 lpm)
+{
+        struct dasd_ccw_req *cqr;
+        struct ccw1 *ccw;
+
+        cqr = dasd_smalloc_request("ECKD", 1 /* RCD */, ciw->count, device);
+
+        if (IS_ERR(cqr)) {
+                DEV_MESSAGE(KERN_WARNING, device, "%s",
+                            "Could not allocate RCD request");
+                return cqr;
+        }
+
+        ccw = cqr->cpaddr;
+        ccw->cmd_code = ciw->cmd;
+        ccw->cda = (__u32)(addr_t)rcd_buffer;
+        ccw->count = ciw->count;
+
+        cqr->device = device;
+        cqr->expires = 10*HZ;
+        cqr->lpm = lpm;
+        clear_bit(DASD_CQR_FLAGS_USE_ERP, &cqr->flags);
+        cqr->retries = 2;
+        cqr->buildclk = get_clock();
+        cqr->status = DASD_CQR_FILLED;
+        return cqr;
+}
+
+static int dasd_eckd_read_conf_lpm(struct dasd_device *device,
+                                   void **rcd_buffer,
+                                   int *rcd_buffer_size, __u8 lpm)
+{
+        struct ciw *ciw;
+        char *rcd_buf = NULL;
+        int ret;
+        struct dasd_ccw_req *cqr;
+
+        /*
+         * scan for RCD command in extended SenseID data
+         */
+        ciw = ccw_device_get_ciw(device->cdev, CIW_TYPE_RCD);
+        if (!ciw || ciw->cmd == 0) {
+                ret = -EOPNOTSUPP;
+                goto out_error;
+        }
+        rcd_buf = kzalloc(ciw->count, GFP_KERNEL | GFP_DMA);
+        if (!rcd_buf) {
+                ret = -ENOMEM;
+                goto out_error;
+        }
+        cqr = dasd_eckd_build_rcd_lpm(device, rcd_buf, ciw, lpm);
+        if (IS_ERR(cqr)) {
+                ret =  PTR_ERR(cqr);
+                goto out_error;
+        }
+        ret = dasd_sleep_on(cqr);
+        /*
+         * on success we update the user input parms
+         */
+        dasd_sfree_request(cqr, cqr->device);
+        if (ret)
+                goto out_error;
+
+        *rcd_buffer_size = ciw->count;
+        *rcd_buffer = rcd_buf;
+        return 0;
+out_error:
+        kfree(rcd_buf);
+        *rcd_buffer = NULL;
+        *rcd_buffer_size = 0;
+        return ret;
+}
+
 static int
 dasd_eckd_read_conf(struct dasd_device *device)
 {
@@ -469,8 +544,8 @@ dasd_eckd_read_conf(struct dasd_device *device)
         /* get configuration data per operational path */
         for (lpm = 0x80; lpm; lpm>>= 1) {
                 if (lpm & path_data->opm){
-                        rc = read_conf_data_lpm(device->cdev, &conf_data,
-                                                &conf_len, lpm);
+                        rc = dasd_eckd_read_conf_lpm(device, &conf_data,
+                                                     &conf_len, lpm);
                         if (rc && rc != -EOPNOTSUPP) {  /* -EOPNOTSUPP is ok */
                                 MESSAGE(KERN_WARNING,
                                         "Read configuration data returned "
@@ -639,7 +714,7 @@ dasd_eckd_check_characteristics(struct dasd_device *device)
         /* Read Device Characteristics */
         rdc_data = (void *) &(private->rdc_data);
         memset(rdc_data, 0, sizeof(rdc_data));
-        rc = read_dev_chars(device->cdev, &rdc_data, 64);
+        rc = dasd_generic_read_dev_chars(device, "ECKD", &rdc_data, 64);
         if (rc)
                 DEV_MESSAGE(KERN_WARNING, device,
                             "Read device characteristics returned "
diff --git a/drivers/s390/block/dasd_fba.c b/drivers/s390/block/dasd_fba.c
index be0909e39226..da16ead8aff2 100644
--- a/drivers/s390/block/dasd_fba.c
+++ b/drivers/s390/block/dasd_fba.c
@@ -135,7 +135,7 @@ dasd_fba_check_characteristics(struct dasd_device *device)
         }
         /* Read Device Characteristics */
         rdc_data = (void *) &(private->rdc_data);
-        rc = read_dev_chars(device->cdev, &rdc_data, 32);
+        rc = dasd_generic_read_dev_chars(device, "FBA ", &rdc_data, 32);
         if (rc) {
                 DEV_MESSAGE(KERN_WARNING, device,
                             "Read device characteristics returned error %d",
diff --git a/drivers/s390/block/dasd_int.h b/drivers/s390/block/dasd_int.h
index a2cc69e11410..241294cba415 100644
--- a/drivers/s390/block/dasd_int.h
+++ b/drivers/s390/block/dasd_int.h
@@ -509,6 +509,8 @@ int dasd_generic_set_online(struct ccw_device *, struct dasd_discipline *);
 int dasd_generic_set_offline (struct ccw_device *cdev);
 int dasd_generic_notify(struct ccw_device *, int);
 
+int dasd_generic_read_dev_chars(struct dasd_device *, char *, void **, int);
+
 /* externals in dasd_devmap.c */
 extern int dasd_max_devindex;
 extern int dasd_probeonly;