IB/mthca: Use an enum for HCA page size

Use a named enum for the HCA's internal page size, rather than having
magic values of 4096 and shifts by 12 all over the code.  Also, fix
one minor bug in EQ handling: only one HCA page is mapped to the HCA
during initialization, but a full kernel page is unmapped during
cleanup.  This might cause problems when PAGE_SIZE != 4096.

Signed-off-by: Ishai Rabinovitz <ishai@mellanox.co.il>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

1 files changed, 14 insertions, 12 deletions

diff --git a/drivers/infiniband/hw/mthca/mthca_cmd.c b/drivers/infiniband/hw/mthca/mthca_cmd.c
index d1e7ecb5f233..948a2861cae3 100644
--- a/drivers/infiniband/hw/mthca/mthca_cmd.c
+++ b/drivers/infiniband/hw/mthca/mthca_cmd.c
@@ -652,8 +652,9 @@ static int mthca_map_cmd(struct mthca_dev *dev, u16 op, struct mthca_icm *icm,
                  * address or size and use that as our log2 size.
                  */
                 lg = ffs(mthca_icm_addr(&iter) | mthca_icm_size(&iter)) - 1;
-                if (lg < 12) {
-                        mthca_warn(dev, "Got FW area not aligned to 4K (%llx/%lx).\n",
+                if (lg < MTHCA_ICM_PAGE_SHIFT) {
+                        mthca_warn(dev, "Got FW area not aligned to %d (%llx/%lx).\n",
+                                   MTHCA_ICM_PAGE_SIZE,
                                    (unsigned long long) mthca_icm_addr(&iter),
                                    mthca_icm_size(&iter));
                         err = -EINVAL;
@@ -665,8 +666,9 @@ static int mthca_map_cmd(struct mthca_dev *dev, u16 op, struct mthca_icm *icm,
                                 virt += 1 << lg;
                         }
 
-                        pages[nent * 2 + 1] = cpu_to_be64((mthca_icm_addr(&iter) +
-                                                           (i << lg)) | (lg - 12));
+                        pages[nent * 2 + 1] =
+                                cpu_to_be64((mthca_icm_addr(&iter) + (i << lg)) |
+                                            (lg - MTHCA_ICM_PAGE_SHIFT));
                         ts += 1 << (lg - 10);
                         ++tc;
 
@@ -822,12 +824,12 @@ int mthca_QUERY_FW(struct mthca_dev *dev, u8 *status)
                 mthca_dbg(dev, "FW size %d KB\n", dev->fw.arbel.fw_pages << 2);
 
                 /*
-                 * Arbel page size is always 4 KB; round up number of
-                 * system pages needed.
+                 * Round up number of system pages needed in case
+                 * MTHCA_ICM_PAGE_SIZE < PAGE_SIZE.
                  */
                 dev->fw.arbel.fw_pages =
-                        ALIGN(dev->fw.arbel.fw_pages, PAGE_SIZE >> 12) >>
-                                (PAGE_SHIFT - 12);
+                        ALIGN(dev->fw.arbel.fw_pages, PAGE_SIZE / MTHCA_ICM_PAGE_SIZE) >>
+                                (PAGE_SHIFT - MTHCA_ICM_PAGE_SHIFT);
 
                 mthca_dbg(dev, "Clear int @ %llx, EQ arm @ %llx, EQ set CI @ %llx\n",
                           (unsigned long long) dev->fw.arbel.clr_int_base,
@@ -1540,11 +1542,11 @@ int mthca_SET_ICM_SIZE(struct mthca_dev *dev, u64 icm_size, u64 *aux_pages,
                 return ret;
 
         /*
-         * Arbel page size is always 4 KB; round up number of system
-         * pages needed.
+         * Round up number of system pages needed in case
+         * MTHCA_ICM_PAGE_SIZE < PAGE_SIZE.
          */
-        *aux_pages = (*aux_pages + (1 << (PAGE_SHIFT - 12)) - 1) >> (PAGE_SHIFT - 12);
-        *aux_pages = ALIGN(*aux_pages, PAGE_SIZE >> 12) >> (PAGE_SHIFT - 12);
+        *aux_pages = ALIGN(*aux_pages, PAGE_SIZE / MTHCA_ICM_PAGE_SIZE) >>
+                (PAGE_SHIFT - MTHCA_ICM_PAGE_SHIFT);
 
         return 0;
 }