[SCSI] zfcp: Replace kmem_cache for "status read" data

zfcp requires a mempool for the status read data blocks to resubmit
the "status read" requests at any time. Each status read data block
has the size of a page (4096 bytes) and needs to be placed in one
page.

Instead of having a kmem_cache for allocating page sized chunks, use
mempool_create_page_pool to create a mempool returning pages and
remove the zfcp kmem_cache.

Signed-off-by: Christof Schmitt <christof.schmitt@de.ibm.com>
Signed-off-by: Steffen Maier <maier@linux.vnet.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

4 files changed, 15 insertions, 22 deletions

diff --git a/drivers/s390/scsi/zfcp_aux.c b/drivers/s390/scsi/zfcp_aux.c
index 51c666fb67a..81e185602bb 100644
--- a/drivers/s390/scsi/zfcp_aux.c
+++ b/drivers/s390/scsi/zfcp_aux.c
@@ -132,11 +132,6 @@ static int __init zfcp_module_init(void)
         if (!zfcp_data.qtcb_cache)
                 goto out_qtcb_cache;
 
-        zfcp_data.sr_buffer_cache = zfcp_cache_hw_align("zfcp_sr",
-                                        sizeof(struct fsf_status_read_buffer));
-        if (!zfcp_data.sr_buffer_cache)
-                goto out_sr_cache;
-
         zfcp_data.gid_pn_cache = zfcp_cache_hw_align("zfcp_gid",
                                         sizeof(struct zfcp_fc_gid_pn));
         if (!zfcp_data.gid_pn_cache)
@@ -181,8 +176,6 @@ out_transport:
 out_adisc_cache:
         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.qtcb_cache);
 out_qtcb_cache:
         kmem_cache_destroy(zfcp_data.gpn_ft_cache);
@@ -199,7 +192,6 @@ static void __exit zfcp_module_exit(void)
         fc_release_transport(zfcp_data.scsi_transport_template);
         kmem_cache_destroy(zfcp_data.adisc_cache);
         kmem_cache_destroy(zfcp_data.gid_pn_cache);
-        kmem_cache_destroy(zfcp_data.sr_buffer_cache);
         kmem_cache_destroy(zfcp_data.qtcb_cache);
         kmem_cache_destroy(zfcp_data.gpn_ft_cache);
 }
@@ -264,10 +256,10 @@ static int zfcp_allocate_low_mem_buffers(struct zfcp_adapter *adapter)
         if (!adapter->pool.qtcb_pool)
                 return -ENOMEM;
 
-        adapter->pool.status_read_data =
-                mempool_create_slab_pool(FSF_STATUS_READS_RECOM,
-                                         zfcp_data.sr_buffer_cache);
-        if (!adapter->pool.status_read_data)
+        BUILD_BUG_ON(sizeof(struct fsf_status_read_buffer) > PAGE_SIZE);
+        adapter->pool.sr_data =
+                mempool_create_page_pool(FSF_STATUS_READS_RECOM, 0);
+        if (!adapter->pool.sr_data)
                 return -ENOMEM;
 
         adapter->pool.gid_pn =
@@ -290,8 +282,8 @@ static void zfcp_free_low_mem_buffers(struct zfcp_adapter *adapter)
                 mempool_destroy(adapter->pool.qtcb_pool);
         if (adapter->pool.status_read_req)
                 mempool_destroy(adapter->pool.status_read_req);
-        if (adapter->pool.status_read_data)
-                mempool_destroy(adapter->pool.status_read_data);
+        if (adapter->pool.sr_data)
+                mempool_destroy(adapter->pool.sr_data);
         if (adapter->pool.gid_pn)
                 mempool_destroy(adapter->pool.gid_pn);
 }
diff --git a/drivers/s390/scsi/zfcp_def.h b/drivers/s390/scsi/zfcp_def.h
index 89e43e17291..93ce500f897 100644
--- a/drivers/s390/scsi/zfcp_def.h
+++ b/drivers/s390/scsi/zfcp_def.h
@@ -107,7 +107,7 @@ struct zfcp_adapter_mempool {
         mempool_t *scsi_req;
         mempool_t *scsi_abort;
         mempool_t *status_read_req;
-        mempool_t *status_read_data;
+        mempool_t *sr_data;
         mempool_t *gid_pn;
         mempool_t *qtcb_pool;
 };
@@ -319,7 +319,6 @@ struct zfcp_data {
         struct scsi_transport_template *scsi_transport_template;
         struct kmem_cache       *gpn_ft_cache;
         struct kmem_cache       *qtcb_cache;
-        struct kmem_cache       *sr_buffer_cache;
         struct kmem_cache       *gid_pn_cache;
         struct kmem_cache       *adisc_cache;
 };
diff --git a/drivers/s390/scsi/zfcp_erp.c b/drivers/s390/scsi/zfcp_erp.c
index e003e306f87..6c1cddf0d0a 100644
--- a/drivers/s390/scsi/zfcp_erp.c
+++ b/drivers/s390/scsi/zfcp_erp.c
@@ -732,7 +732,7 @@ static int zfcp_erp_adapter_strategy_open_fsf(struct zfcp_erp_action *act)
         if (zfcp_erp_adapter_strategy_open_fsf_xport(act) == ZFCP_ERP_FAILED)
                 return ZFCP_ERP_FAILED;
 
-        if (mempool_resize(act->adapter->pool.status_read_data,
+        if (mempool_resize(act->adapter->pool.sr_data,
                            act->adapter->stat_read_buf_num, GFP_KERNEL))
                 return ZFCP_ERP_FAILED;
 
diff --git a/drivers/s390/scsi/zfcp_fsf.c b/drivers/s390/scsi/zfcp_fsf.c
index 6efaea9207c..a2b0e8435fc 100644
--- a/drivers/s390/scsi/zfcp_fsf.c
+++ b/drivers/s390/scsi/zfcp_fsf.c
@@ -212,7 +212,7 @@ static void zfcp_fsf_status_read_handler(struct zfcp_fsf_req *req)
 
         if (req->status & ZFCP_STATUS_FSFREQ_DISMISSED) {
                 zfcp_dbf_hba_fsf_uss("fssrh_1", req);
-                mempool_free(sr_buf, adapter->pool.status_read_data);
+                mempool_free(virt_to_page(sr_buf), adapter->pool.sr_data);
                 zfcp_fsf_req_free(req);
                 return;
         }
@@ -265,7 +265,7 @@ static void zfcp_fsf_status_read_handler(struct zfcp_fsf_req *req)
                 break;
         }
 
-        mempool_free(sr_buf, adapter->pool.status_read_data);
+        mempool_free(virt_to_page(sr_buf), adapter->pool.sr_data);
         zfcp_fsf_req_free(req);
 
         atomic_inc(&adapter->stat_miss);
@@ -723,6 +723,7 @@ int zfcp_fsf_status_read(struct zfcp_qdio *qdio)
         struct zfcp_adapter *adapter = qdio->adapter;
         struct zfcp_fsf_req *req;
         struct fsf_status_read_buffer *sr_buf;
+        struct page *page;
         int retval = -EIO;
 
         spin_lock_irq(&qdio->req_q_lock);
@@ -736,11 +737,12 @@ int zfcp_fsf_status_read(struct zfcp_qdio *qdio)
                 goto out;
         }
 
-        sr_buf = mempool_alloc(adapter->pool.status_read_data, GFP_ATOMIC);
-        if (!sr_buf) {
+        page = mempool_alloc(adapter->pool.sr_data, GFP_ATOMIC);
+        if (!page) {
                 retval = -ENOMEM;
                 goto failed_buf;
         }
+        sr_buf = page_address(page);
         memset(sr_buf, 0, sizeof(*sr_buf));
         req->data = sr_buf;
 
@@ -755,7 +757,7 @@ int zfcp_fsf_status_read(struct zfcp_qdio *qdio)
 
 failed_req_send:
         req->data = NULL;
-        mempool_free(sr_buf, adapter->pool.status_read_data);
+        mempool_free(virt_to_page(sr_buf), adapter->pool.sr_data);
 failed_buf:
         zfcp_dbf_hba_fsf_uss("fssr__1", req);
         zfcp_fsf_req_free(req);