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authorXiang Chen <chenxiang66@hisilicon.com>2019-08-05 21:48:05 +0800
committerMartin K. Petersen <martin.petersen@oracle.com>2019-08-07 22:13:15 -0400
commit599aefc81effaaf78c02d44461f7157f22ee3b1d (patch)
treeae1b15480219247cdb3b0941c285d44dd279e771 /drivers/scsi/hisi_sas
parentd380f55503ed28461422546900baedc3b512b4b7 (diff)
scsi: hisi_sas: Make slot buf minimum allocation of PAGE_SIZE
For a system with PAGE_SIZE of 16K or 64K, the size every time we want to alloc may be small like 4K, but for function dmam_alloc_coherent(), the least size it allocates is PAGE_SIZE, so it will waste much memory for the situation. To solve the issue, limit the minimum allocation size of slot buf to PAGE_SIZE. Signed-off-by: Xiang Chen <chenxiang66@hisilicon.com> Signed-off-by: John Garry <john.garry@huawei.com> Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Diffstat (limited to 'drivers/scsi/hisi_sas')
-rw-r--r--drivers/scsi/hisi_sas/hisi_sas_main.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/scsi/hisi_sas/hisi_sas_main.c b/drivers/scsi/hisi_sas/hisi_sas_main.c
index 7efa8dfa0cc1..39ae69e42d26 100644
--- a/drivers/scsi/hisi_sas/hisi_sas_main.c
+++ b/drivers/scsi/hisi_sas/hisi_sas_main.c
@@ -2389,7 +2389,7 @@ int hisi_sas_alloc(struct hisi_hba *hisi_hba)
else
sz_slot_buf_ru = sizeof(struct hisi_sas_slot_buf_table);
sz_slot_buf_ru = roundup(sz_slot_buf_ru, 64);
- s = lcm(max_command_entries_ru, sz_slot_buf_ru);
+ s = max(lcm(max_command_entries_ru, sz_slot_buf_ru), PAGE_SIZE);
blk_cnt = (max_command_entries_ru * sz_slot_buf_ru) / s;
slots_per_blk = s / sz_slot_buf_ru;