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authorHeiko Carstens <heiko.carstens@de.ibm.com>2006-09-18 22:28:49 +0200
committerJames Bottomley <jejb@mulgrave.il.steeleye.com>2006-09-23 17:54:24 -0500
commitdd52e0eaf891cd85bf2ca057c15ed6bfd76db4e6 (patch)
treedc457fe1b732716b715c05864ab02be767414cb4 /drivers/s390/scsi/zfcp_aux.c
parentd136205182b1ea4897da31e325a296f8831a6796 (diff)
[SCSI] zfcp: create private slab caches to guarantee proper data alignment
Create private slab caches in order to guarantee proper alignment of data structures that get passed to hardware. Sidenote: with this patch slab cache debugging will finally work on s390 (at least no known problems left). Furthermore this patch does some minor cleanups: - store ptr for transport template in struct zfcp_data Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com> Signed-off-by: Andreas Herrmann <aherrman@de.ibm.com> Compile fix ups and Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
Diffstat (limited to 'drivers/s390/scsi/zfcp_aux.c')
-rw-r--r--drivers/s390/scsi/zfcp_aux.c76
1 files changed, 58 insertions, 18 deletions
diff --git a/drivers/s390/scsi/zfcp_aux.c b/drivers/s390/scsi/zfcp_aux.c
index adc9d8f2c28..d2b094d9c34 100644
--- a/drivers/s390/scsi/zfcp_aux.c
+++ b/drivers/s390/scsi/zfcp_aux.c
@@ -299,11 +299,45 @@ zfcp_init_device_configure(void)
return;
}
+static int calc_alignment(int size)
+{
+ int align = 1;
+
+ if (!size)
+ return 0;
+
+ while ((size - align) > 0)
+ align <<= 1;
+
+ return align;
+}
+
static int __init
zfcp_module_init(void)
{
+ int retval = -ENOMEM;
+ int size, align;
+
+ size = sizeof(struct zfcp_fsf_req_qtcb);
+ align = calc_alignment(size);
+ zfcp_data.fsf_req_qtcb_cache =
+ kmem_cache_create("zfcp_fsf", size, align, 0, NULL, NULL);
+ if (!zfcp_data.fsf_req_qtcb_cache)
+ goto out;
- int retval = 0;
+ size = sizeof(struct fsf_status_read_buffer);
+ align = calc_alignment(size);
+ zfcp_data.sr_buffer_cache =
+ kmem_cache_create("zfcp_sr", size, align, 0, NULL, NULL);
+ if (!zfcp_data.sr_buffer_cache)
+ goto out_sr_cache;
+
+ size = sizeof(struct zfcp_gid_pn_data);
+ align = calc_alignment(size);
+ zfcp_data.gid_pn_cache =
+ kmem_cache_create("zfcp_gid", size, align, 0, NULL, NULL);
+ if (!zfcp_data.gid_pn_cache)
+ goto out_gid_cache;
atomic_set(&zfcp_data.loglevel, loglevel);
@@ -313,15 +347,16 @@ zfcp_module_init(void)
/* initialize adapters to be removed list head */
INIT_LIST_HEAD(&zfcp_data.adapter_remove_lh);
- zfcp_transport_template = fc_attach_transport(&zfcp_transport_functions);
- if (!zfcp_transport_template)
- return -ENODEV;
+ zfcp_data.scsi_transport_template =
+ fc_attach_transport(&zfcp_transport_functions);
+ if (!zfcp_data.scsi_transport_template)
+ goto out_transport;
retval = misc_register(&zfcp_cfdc_misc);
if (retval != 0) {
ZFCP_LOG_INFO("registration of misc device "
"zfcp_cfdc failed\n");
- goto out;
+ goto out_misc;
}
ZFCP_LOG_TRACE("major/minor for zfcp_cfdc: %d/%d\n",
@@ -333,9 +368,6 @@ zfcp_module_init(void)
/* initialise configuration rw lock */
rwlock_init(&zfcp_data.config_lock);
- /* save address of data structure managing the driver module */
- zfcp_data.scsi_host_template.module = THIS_MODULE;
-
/* setup dynamic I/O */
retval = zfcp_ccw_register();
if (retval) {
@@ -350,6 +382,14 @@ zfcp_module_init(void)
out_ccw_register:
misc_deregister(&zfcp_cfdc_misc);
+ out_misc:
+ fc_release_transport(zfcp_data.scsi_transport_template);
+ out_transport:
+ kmem_cache_destroy(zfcp_data.gid_pn_cache);
+ out_gid_cache:
+ kmem_cache_destroy(zfcp_data.sr_buffer_cache);
+ out_sr_cache:
+ kmem_cache_destroy(zfcp_data.fsf_req_qtcb_cache);
out:
return retval;
}
@@ -935,20 +975,20 @@ static int
zfcp_allocate_low_mem_buffers(struct zfcp_adapter *adapter)
{
adapter->pool.fsf_req_erp =
- mempool_create_kmalloc_pool(ZFCP_POOL_FSF_REQ_ERP_NR,
- sizeof(struct zfcp_fsf_req_pool_element));
+ mempool_create_slab_pool(ZFCP_POOL_FSF_REQ_ERP_NR,
+ zfcp_data.fsf_req_qtcb_cache);
if (!adapter->pool.fsf_req_erp)
return -ENOMEM;
adapter->pool.fsf_req_scsi =
- mempool_create_kmalloc_pool(ZFCP_POOL_FSF_REQ_SCSI_NR,
- sizeof(struct zfcp_fsf_req_pool_element));
+ mempool_create_slab_pool(ZFCP_POOL_FSF_REQ_SCSI_NR,
+ zfcp_data.fsf_req_qtcb_cache);
if (!adapter->pool.fsf_req_scsi)
return -ENOMEM;
adapter->pool.fsf_req_abort =
- mempool_create_kmalloc_pool(ZFCP_POOL_FSF_REQ_ABORT_NR,
- sizeof(struct zfcp_fsf_req_pool_element));
+ mempool_create_slab_pool(ZFCP_POOL_FSF_REQ_ABORT_NR,
+ zfcp_data.fsf_req_qtcb_cache);
if (!adapter->pool.fsf_req_abort)
return -ENOMEM;
@@ -959,14 +999,14 @@ zfcp_allocate_low_mem_buffers(struct zfcp_adapter *adapter)
return -ENOMEM;
adapter->pool.data_status_read =
- mempool_create_kmalloc_pool(ZFCP_POOL_STATUS_READ_NR,
- sizeof(struct fsf_status_read_buffer));
+ mempool_create_slab_pool(ZFCP_POOL_STATUS_READ_NR,
+ zfcp_data.sr_buffer_cache);
if (!adapter->pool.data_status_read)
return -ENOMEM;
adapter->pool.data_gid_pn =
- mempool_create_kmalloc_pool(ZFCP_POOL_DATA_GID_PN_NR,
- sizeof(struct zfcp_gid_pn_data));
+ mempool_create_slab_pool(ZFCP_POOL_DATA_GID_PN_NR,
+ zfcp_data.gid_pn_cache);
if (!adapter->pool.data_gid_pn)
return -ENOMEM;