IB/ehca: Assure 4K alignment for firmware control blocks

Assure 4K alignment for firmware control blocks in 64K page mode,
because kzalloc()'s result address might not be 4K aligned if 64K
pages are enabled. Thus, we introduce wrappers called
ehca_{alloc,free}_fw_ctrlblock(), which use a slab cache for objects
with 4K length and 4K alignment in order to alloc/free firmware
control blocks in 64K page mode. In 4K page mode those wrappers just
are defines of get_zeroed_page() and free_page().

Signed-off-by: Hoang-Nam Nguyen <hnguyen@de.ibm.com>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

6 files changed, 81 insertions, 35 deletions

diff --git a/drivers/infiniband/hw/ehca/ehca_hca.c b/drivers/infiniband/hw/ehca/ehca_hca.c
index 5eae6ac48425..e1b618c5f685 100644
--- a/drivers/infiniband/hw/ehca/ehca_hca.c
+++ b/drivers/infiniband/hw/ehca/ehca_hca.c
@@ -40,6 +40,7 @@
  */
 
 #include "ehca_tools.h"
+#include "ehca_iverbs.h"
 #include "hcp_if.h"
 
 int ehca_query_device(struct ib_device *ibdev, struct ib_device_attr *props)
@@ -49,7 +50,7 @@ int ehca_query_device(struct ib_device *ibdev, struct ib_device_attr *props)
                                               ib_device);
         struct hipz_query_hca *rblock;
 
-        rblock = kzalloc(H_CB_ALIGNMENT, GFP_KERNEL);
+        rblock = ehca_alloc_fw_ctrlblock();
         if (!rblock) {
                 ehca_err(&shca->ib_device, "Can't allocate rblock memory.");
                 return -ENOMEM;
@@ -96,7 +97,7 @@ int ehca_query_device(struct ib_device *ibdev, struct ib_device_attr *props)
                 = min_t(int, rblock->max_total_mcast_qp_attach, INT_MAX);
 
 query_device1:
-        kfree(rblock);
+        ehca_free_fw_ctrlblock(rblock);
 
         return ret;
 }
@@ -109,7 +110,7 @@ int ehca_query_port(struct ib_device *ibdev,
                                               ib_device);
         struct hipz_query_port *rblock;
 
-        rblock = kzalloc(H_CB_ALIGNMENT, GFP_KERNEL);
+        rblock = ehca_alloc_fw_ctrlblock();
         if (!rblock) {
                 ehca_err(&shca->ib_device, "Can't allocate rblock memory.");
                 return -ENOMEM;
@@ -162,7 +163,7 @@ int ehca_query_port(struct ib_device *ibdev,
         props->active_speed    = 0x1;
 
 query_port1:
-        kfree(rblock);
+        ehca_free_fw_ctrlblock(rblock);
 
         return ret;
 }
@@ -178,7 +179,7 @@ int ehca_query_pkey(struct ib_device *ibdev, u8 port, u16 index, u16 *pkey)
                 return -EINVAL;
         }
 
-        rblock = kzalloc(H_CB_ALIGNMENT, GFP_KERNEL);
+        rblock = ehca_alloc_fw_ctrlblock();
         if (!rblock) {
                 ehca_err(&shca->ib_device,  "Can't allocate rblock memory.");
                 return -ENOMEM;
@@ -193,7 +194,7 @@ int ehca_query_pkey(struct ib_device *ibdev, u8 port, u16 index, u16 *pkey)
         memcpy(pkey, &rblock->pkey_entries + index, sizeof(u16));
 
 query_pkey1:
-        kfree(rblock);
+        ehca_free_fw_ctrlblock(rblock);
 
         return ret;
 }
@@ -211,7 +212,7 @@ int ehca_query_gid(struct ib_device *ibdev, u8 port,
                 return -EINVAL;
         }
 
-        rblock = kzalloc(H_CB_ALIGNMENT, GFP_KERNEL);
+        rblock = ehca_alloc_fw_ctrlblock();
         if (!rblock) {
                 ehca_err(&shca->ib_device, "Can't allocate rblock memory.");
                 return -ENOMEM;
@@ -227,7 +228,7 @@ int ehca_query_gid(struct ib_device *ibdev, u8 port,
         memcpy(&gid->raw[8], &rblock->guid_entries[index], sizeof(u64));
 
 query_gid1:
-        kfree(rblock);
+        ehca_free_fw_ctrlblock(rblock);
 
         return ret;
 }
diff --git a/drivers/infiniband/hw/ehca/ehca_irq.c b/drivers/infiniband/hw/ehca/ehca_irq.c
index 048cc443d1e7..c3ea746e9045 100644
--- a/drivers/infiniband/hw/ehca/ehca_irq.c
+++ b/drivers/infiniband/hw/ehca/ehca_irq.c
@@ -45,6 +45,7 @@
 #include "ehca_tools.h"
 #include "hcp_if.h"
 #include "hipz_fns.h"
+#include "ipz_pt_fn.h"
 
 #define EQE_COMPLETION_EVENT   EHCA_BMASK_IBM(1,1)
 #define EQE_CQ_QP_NUMBER       EHCA_BMASK_IBM(8,31)
@@ -137,38 +138,36 @@ int ehca_error_data(struct ehca_shca *shca, void *data,
         u64 *rblock;
         unsigned long block_count;
 
-        rblock = kzalloc(H_CB_ALIGNMENT, GFP_KERNEL);
+        rblock = ehca_alloc_fw_ctrlblock();
         if (!rblock) {
                 ehca_err(&shca->ib_device, "Cannot allocate rblock memory.");
                 ret = -ENOMEM;
                 goto error_data1;
         }
 
+        /* rblock must be 4K aligned and should be 4K large */
         ret = hipz_h_error_data(shca->ipz_hca_handle,
                                 resource,
                                 rblock,
                                 &block_count);
 
-        if (ret == H_R_STATE) {
+        if (ret == H_R_STATE)
                 ehca_err(&shca->ib_device,
                          "No error data is available: %lx.", resource);
-        }
         else if (ret == H_SUCCESS) {
                 int length;
 
                 length = EHCA_BMASK_GET(ERROR_DATA_LENGTH, rblock[0]);
 
-                if (length > PAGE_SIZE)
-                        length = PAGE_SIZE;
+                if (length > EHCA_PAGESIZE)
+                        length = EHCA_PAGESIZE;
 
                 print_error_data(shca, data, rblock, length);
-        }
-        else {
+        } else
                 ehca_err(&shca->ib_device,
                          "Error data could not be fetched: %lx", resource);
-        }
 
-        kfree(rblock);
+        ehca_free_fw_ctrlblock(rblock);
 
 error_data1:
         return ret;
diff --git a/drivers/infiniband/hw/ehca/ehca_iverbs.h b/drivers/infiniband/hw/ehca/ehca_iverbs.h
index 319c39d47f3a..3720e3032cce 100644
--- a/drivers/infiniband/hw/ehca/ehca_iverbs.h
+++ b/drivers/infiniband/hw/ehca/ehca_iverbs.h
@@ -179,4 +179,12 @@ int ehca_mmap_register(u64 physical,void **mapped,
 
 int ehca_munmap(unsigned long addr, size_t len);
 
+#ifdef CONFIG_PPC_64K_PAGES
+void *ehca_alloc_fw_ctrlblock(void);
+void ehca_free_fw_ctrlblock(void *ptr);
+#else
+#define ehca_alloc_fw_ctrlblock() ((void *) get_zeroed_page(GFP_KERNEL))
+#define ehca_free_fw_ctrlblock(ptr) free_page((unsigned long)(ptr))
+#endif
+
 #endif
diff --git a/drivers/infiniband/hw/ehca/ehca_main.c b/drivers/infiniband/hw/ehca/ehca_main.c
index 024d511c4b58..01f5aa9cb56d 100644
--- a/drivers/infiniband/hw/ehca/ehca_main.c
+++ b/drivers/infiniband/hw/ehca/ehca_main.c
@@ -40,6 +40,9 @@
  * POSSIBILITY OF SUCH DAMAGE.
  */
 
+#ifdef CONFIG_PPC_64K_PAGES
+#include <linux/slab.h>
+#endif
 #include "ehca_classes.h"
 #include "ehca_iverbs.h"
 #include "ehca_mrmw.h"
@@ -49,7 +52,7 @@
 MODULE_LICENSE("Dual BSD/GPL");
 MODULE_AUTHOR("Christoph Raisch <raisch@de.ibm.com>");
 MODULE_DESCRIPTION("IBM eServer HCA InfiniBand Device Driver");
-MODULE_VERSION("SVNEHCA_0017");
+MODULE_VERSION("SVNEHCA_0018");
 
 int ehca_open_aqp1     = 0;
 int ehca_debug_level   = 0;
@@ -94,11 +97,31 @@ spinlock_t ehca_cq_idr_lock;
 DEFINE_IDR(ehca_qp_idr);
 DEFINE_IDR(ehca_cq_idr);
 
+
 static struct list_head shca_list; /* list of all registered ehcas */
 static spinlock_t shca_list_lock;
 
 static struct timer_list poll_eqs_timer;
 
+#ifdef CONFIG_PPC_64K_PAGES
+static struct kmem_cache *ctblk_cache = NULL;
+
+void *ehca_alloc_fw_ctrlblock(void)
+{
+        void *ret = kmem_cache_zalloc(ctblk_cache, SLAB_KERNEL);
+        if (!ret)
+                ehca_gen_err("Out of memory for ctblk");
+        return ret;
+}
+
+void ehca_free_fw_ctrlblock(void *ptr)
+{
+        if (ptr)
+                kmem_cache_free(ctblk_cache, ptr);
+
+}
+#endif
+
 static int ehca_create_slab_caches(void)
 {
         int ret;
@@ -133,6 +156,17 @@ static int ehca_create_slab_caches(void)
                 goto create_slab_caches5;
         }
 
+#ifdef CONFIG_PPC_64K_PAGES
+        ctblk_cache = kmem_cache_create("ehca_cache_ctblk",
+                                        EHCA_PAGESIZE, H_CB_ALIGNMENT,
+                                        SLAB_HWCACHE_ALIGN,
+                                        NULL, NULL);
+        if (!ctblk_cache) {
+                ehca_gen_err("Cannot create ctblk SLAB cache.");
+                ehca_cleanup_mrmw_cache();
+                goto create_slab_caches5;
+        }
+#endif
         return 0;
 
 create_slab_caches5:
@@ -157,6 +191,10 @@ static void ehca_destroy_slab_caches(void)
         ehca_cleanup_qp_cache();
         ehca_cleanup_cq_cache();
         ehca_cleanup_pd_cache();
+#ifdef CONFIG_PPC_64K_PAGES
+        if (ctblk_cache)
+                kmem_cache_destroy(ctblk_cache);
+#endif
 }
 
 #define EHCA_HCAAVER  EHCA_BMASK_IBM(32,39)
@@ -168,7 +206,7 @@ int ehca_sense_attributes(struct ehca_shca *shca)
         u64 h_ret;
         struct hipz_query_hca *rblock;
 
-        rblock = kzalloc(H_CB_ALIGNMENT, GFP_KERNEL);
+        rblock = ehca_alloc_fw_ctrlblock();
         if (!rblock) {
                 ehca_gen_err("Cannot allocate rblock memory.");
                 return -ENOMEM;
@@ -211,7 +249,7 @@ int ehca_sense_attributes(struct ehca_shca *shca)
         shca->sport[1].rate = IB_RATE_30_GBPS;
 
 num_ports1:
-        kfree(rblock);
+        ehca_free_fw_ctrlblock(rblock);
         return ret;
 }
 
@@ -220,7 +258,7 @@ static int init_node_guid(struct ehca_shca *shca)
         int ret = 0;
         struct hipz_query_hca *rblock;
 
-        rblock = kzalloc(H_CB_ALIGNMENT, GFP_KERNEL);
+        rblock = ehca_alloc_fw_ctrlblock();
         if (!rblock) {
                 ehca_err(&shca->ib_device, "Can't allocate rblock memory.");
                 return -ENOMEM;
@@ -235,7 +273,7 @@ static int init_node_guid(struct ehca_shca *shca)
         memcpy(&shca->ib_device.node_guid, &rblock->node_guid, sizeof(u64));
 
 init_node_guid1:
-        kfree(rblock);
+        ehca_free_fw_ctrlblock(rblock);
         return ret;
 }
 
@@ -431,7 +469,7 @@ static ssize_t  ehca_show_##name(struct device *dev,                       \
                                                                            \
         shca = dev->driver_data;                                           \
                                                                            \
-        rblock = kzalloc(H_CB_ALIGNMENT, GFP_KERNEL);                      \
+        rblock = ehca_alloc_fw_ctrlblock();                                \
         if (!rblock) {                                                     \
                 dev_err(dev, "Can't allocate rblock memory.");             \
                 return 0;                                                  \
@@ -439,12 +477,12 @@ static ssize_t  ehca_show_##name(struct device *dev,                       \
                                                                            \
         if (hipz_h_query_hca(shca->ipz_hca_handle, rblock) != H_SUCCESS) { \
                 dev_err(dev, "Can't query device properties");             \
-                kfree(rblock);                                             \
+                ehca_free_fw_ctrlblock(rblock);                            \
                 return 0;                                                  \
         }                                                                  \
                                                                            \
         data = rblock->name;                                               \
-        kfree(rblock);                                                     \
+        ehca_free_fw_ctrlblock(rblock);                                    \
                                                                            \
         if ((strcmp(#name, "num_ports") == 0) && (ehca_nr_ports == 1))     \
                 return snprintf(buf, 256, "1\n");                          \
@@ -752,7 +790,7 @@ int __init ehca_module_init(void)
         int ret;
 
         printk(KERN_INFO "eHCA Infiniband Device Driver "
-                         "(Rel.: SVNEHCA_0017)\n");
+                         "(Rel.: SVNEHCA_0018)\n");
         idr_init(&ehca_qp_idr);
         idr_init(&ehca_cq_idr);
         spin_lock_init(&ehca_qp_idr_lock);
diff --git a/drivers/infiniband/hw/ehca/ehca_mrmw.c b/drivers/infiniband/hw/ehca/ehca_mrmw.c
index 5ca65441e1da..abce676c0ae0 100644
--- a/drivers/infiniband/hw/ehca/ehca_mrmw.c
+++ b/drivers/infiniband/hw/ehca/ehca_mrmw.c
@@ -1013,7 +1013,7 @@ int ehca_reg_mr_rpages(struct ehca_shca *shca,
         u32 i;
         u64 *kpage;
 
-        kpage = kzalloc(H_CB_ALIGNMENT, GFP_KERNEL);
+        kpage = ehca_alloc_fw_ctrlblock();
         if (!kpage) {
                 ehca_err(&shca->ib_device, "kpage alloc failed");
                 ret = -ENOMEM;
@@ -1092,7 +1092,7 @@ int ehca_reg_mr_rpages(struct ehca_shca *shca,
 
 
 ehca_reg_mr_rpages_exit1:
-        kfree(kpage);
+        ehca_free_fw_ctrlblock(kpage);
 ehca_reg_mr_rpages_exit0:
         if (ret)
                 ehca_err(&shca->ib_device, "ret=%x shca=%p e_mr=%p pginfo=%p "
@@ -1124,7 +1124,7 @@ inline int ehca_rereg_mr_rereg1(struct ehca_shca *shca,
         ehca_mrmw_map_acl(acl, &hipz_acl);
         ehca_mrmw_set_pgsize_hipz_acl(&hipz_acl);
 
-        kpage = kzalloc(H_CB_ALIGNMENT, GFP_KERNEL);
+        kpage = ehca_alloc_fw_ctrlblock();
         if (!kpage) {
                 ehca_err(&shca->ib_device, "kpage alloc failed");
                 ret = -ENOMEM;
@@ -1181,7 +1181,7 @@ inline int ehca_rereg_mr_rereg1(struct ehca_shca *shca,
         }
 
 ehca_rereg_mr_rereg1_exit1:
-        kfree(kpage);
+        ehca_free_fw_ctrlblock(kpage);
 ehca_rereg_mr_rereg1_exit0:
         if ( ret && (ret != -EAGAIN) )
                 ehca_err(&shca->ib_device, "ret=%x lkey=%x rkey=%x "
diff --git a/drivers/infiniband/hw/ehca/ehca_qp.c b/drivers/infiniband/hw/ehca/ehca_qp.c
index 4394123cdbd7..cf3e50ee2d06 100644
--- a/drivers/infiniband/hw/ehca/ehca_qp.c
+++ b/drivers/infiniband/hw/ehca/ehca_qp.c
@@ -811,8 +811,8 @@ static int internal_modify_qp(struct ib_qp *ibqp,
         unsigned long spl_flags = 0;
 
         /* do query_qp to obtain current attr values */
-        mqpcb = kzalloc(H_CB_ALIGNMENT, GFP_KERNEL);
-        if (mqpcb == NULL) {
+        mqpcb = ehca_alloc_fw_ctrlblock();
+        if (!mqpcb) {
                 ehca_err(ibqp->device, "Could not get zeroed page for mqpcb "
                          "ehca_qp=%p qp_num=%x ", my_qp, ibqp->qp_num);
                 return -ENOMEM;
@@ -1225,7 +1225,7 @@ modify_qp_exit2:
         }
 
 modify_qp_exit1:
-        kfree(mqpcb);
+        ehca_free_fw_ctrlblock(mqpcb);
 
         return ret;
 }
@@ -1277,7 +1277,7 @@ int ehca_query_qp(struct ib_qp *qp,
                 return -EINVAL;
         }
 
-        qpcb = kzalloc(H_CB_ALIGNMENT, GFP_KERNEL );
+        qpcb = ehca_alloc_fw_ctrlblock();
         if (!qpcb) {
                 ehca_err(qp->device,"Out of memory for qpcb "
                          "ehca_qp=%p qp_num=%x", my_qp, qp->qp_num);
@@ -1401,7 +1401,7 @@ int ehca_query_qp(struct ib_qp *qp,
                 ehca_dmp(qpcb, 4*70, "qp_num=%x", qp->qp_num);
 
 query_qp_exit1:
-        kfree(qpcb);
+        ehca_free_fw_ctrlblock(qpcb);
 
         return ret;
 }