IB/qib: Change lkey table allocation to support more MRs

commit d6f1c17e162b2a11e708f28fa93f2f79c164b442 upstream.

The lkey table is allocated with with a get_user_pages() with an
order based on a number of index bits from a module parameter.

The underlying kernel code cannot allocate that many contiguous pages.

There is no reason the underlying memory needs to be physically
contiguous.

This patch:
- switches the allocation/deallocation to vmalloc/vfree
- caps the number of bits to 23 to insure at least 1 generation bit
  o this matches the module parameter description

Reviewed-by: Vinit Agnihotri <vinit.abhay.agnihotri@intel.com>
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
[bwh: Backported to 3.2:
 - Adjust context
 - Add definition of qib_dev_warn(), added upstream by commit ddb887658970
   ("IB/qib: Convert opcode counters to per-context")]
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Zefan Li <lizefan@huawei.com>

diff --git a/drivers/infiniband/hw/qib/qib.h b/drivers/infiniband/hw/qib/qib.h
index c7d4ef18cd40d71802aa448f63942ebea34e10bb..dcff64f6ced24e63c56c5fee1e4f96e0b8475976 100644 (file)
--- a/drivers/infiniband/hw/qib/qib.h
+++ b/drivers/infiniband/hw/qib/qib.h
@@ -1429,6 +1429,10 @@ extern struct mutex qib_mutex;
                        qib_get_unit_name((dd)->unit), ##__VA_ARGS__); \
        } while (0)
 
+#define qib_dev_warn(dd, fmt, ...) \
+       dev_warn(&(dd)->pcidev->dev, "%s: " fmt, \
+               qib_get_unit_name((dd)->unit), ##__VA_ARGS__)
+
 #define qib_dev_porterr(dd, port, fmt, ...) \
        do { \
                dev_err(&(dd)->pcidev->dev, "%s: IB%u:%u " fmt, \

diff --git a/drivers/infiniband/hw/qib/qib_keys.c b/drivers/infiniband/hw/qib/qib_keys.c
index 8fd19a47df0c76a7d7527f302d32449c6bdbec4d..ca6e6cfd7b8ffad419403c769c8189bcce0d6326 100644 (file)
--- a/drivers/infiniband/hw/qib/qib_keys.c
+++ b/drivers/infiniband/hw/qib/qib_keys.c
@@ -69,6 +69,10 @@ int qib_alloc_lkey(struct qib_lkey_table *rkt, struct qib_mregion *mr)
         * unrestricted LKEY.
         */
        rkt->gen++;
+       /*
+        * bits are capped in qib_verbs.c to insure enough bits
+        * for generation number
+        */
        mr->lkey = (r << (32 - ib_qib_lkey_table_size)) |
                ((((1 << (24 - ib_qib_lkey_table_size)) - 1) & rkt->gen)
                 << 8);

diff --git a/drivers/infiniband/hw/qib/qib_verbs.c b/drivers/infiniband/hw/qib/qib_verbs.c
index 7b6c3bffa9d9fa0cd1090b5498bb663d1cbc5b6f..395d9d619af3ceecfe994e2d94a50108372004a5 100644 (file)
--- a/drivers/infiniband/hw/qib/qib_verbs.c
+++ b/drivers/infiniband/hw/qib/qib_verbs.c
@@ -40,6 +40,7 @@
 #include <linux/rculist.h>
 #include <linux/mm.h>
 #include <linux/random.h>
+#include <linux/vmalloc.h>
 
 #include "qib.h"
 #include "qib_common.h"
@@ -2058,10 +2059,16 @@ int qib_register_ib_device(struct qib_devdata *dd)
         * the LKEY).  The remaining bits act as a generation number or tag.
         */
        spin_lock_init(&dev->lk_table.lock);
+       /* insure generation is at least 4 bits see keys.c */
+       if (ib_qib_lkey_table_size > MAX_LKEY_TABLE_BITS) {
+               qib_dev_warn(dd, "lkey bits %u too large, reduced to %u\n",
+                       ib_qib_lkey_table_size, MAX_LKEY_TABLE_BITS);
+               ib_qib_lkey_table_size = MAX_LKEY_TABLE_BITS;
+       }
        dev->lk_table.max = 1 << ib_qib_lkey_table_size;
        lk_tab_size = dev->lk_table.max * sizeof(*dev->lk_table.table);
        dev->lk_table.table = (struct qib_mregion **)
-               __get_free_pages(GFP_KERNEL, get_order(lk_tab_size));
+               vmalloc(lk_tab_size);
        if (dev->lk_table.table == NULL) {
                ret = -ENOMEM;
                goto err_lk;
@@ -2231,7 +2238,7 @@ err_tx:
                                        sizeof(struct qib_pio_header),
                                  dev->pio_hdrs, dev->pio_hdrs_phys);
 err_hdrs:
-       free_pages((unsigned long) dev->lk_table.table, get_order(lk_tab_size));
+       vfree(dev->lk_table.table);
 err_lk:
        kfree(dev->qp_table);
 err_qpt:
@@ -2285,7 +2292,6 @@ void qib_unregister_ib_device(struct qib_devdata *dd)
                                        sizeof(struct qib_pio_header),
                                  dev->pio_hdrs, dev->pio_hdrs_phys);
        lk_tab_size = dev->lk_table.max * sizeof(*dev->lk_table.table);
-       free_pages((unsigned long) dev->lk_table.table,
-                  get_order(lk_tab_size));
+       vfree(dev->lk_table.table);
        kfree(dev->qp_table);
 }

diff --git a/drivers/infiniband/hw/qib/qib_verbs.h b/drivers/infiniband/hw/qib/qib_verbs.h
index 0c19ef0c41233de4efaf25db3eb1886213a3407b..66f7f62388b06976b5f4f3059e3734817ee7b8f4 100644 (file)
--- a/drivers/infiniband/hw/qib/qib_verbs.h
+++ b/drivers/infiniband/hw/qib/qib_verbs.h
@@ -622,6 +622,8 @@ struct qib_qpn_table {
        struct qpn_map map[QPNMAP_ENTRIES];
 };
 
+#define MAX_LKEY_TABLE_BITS 23
+
 struct qib_lkey_table {
        spinlock_t lock; /* protect changes in this struct */
        u32 next;               /* next unused index (speeds search) */