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RDMA/hns: Modify uar allocation algorithm to avoid bitmap exhaust

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This patch modified uar allocation algorithm in hns_roce_uar_alloc
function to avoid bitmap exhaust.

Signed-off-by: Wei Hu (Xavier) <xavier.huwei@huawei.com>
Reviewed-by: Leon Romanovsky <leonro@mellanox.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
This commit is contained in:
Wei Hu(Xavier) 2018-05-23 18:16:27 +08:00 committed by Jason Gunthorpe
parent c62091bcd9
commit 5b6eb54f58
2 changed files with 7 additions and 4 deletions
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1
drivers/infiniband/hw/hns/hns_roce_device.h
View File

@ -214,6 +214,7 @@ enum {
struct hns_roce_uar {
u64 pfn;
unsigned long index;
unsigned long logic_idx;
};
struct hns_roce_ucontext {

10
drivers/infiniband/hw/hns/hns_roce_pd.c
View File

@ -107,13 +107,15 @@ int hns_roce_uar_alloc(struct hns_roce_dev *hr_dev, struct hns_roce_uar *uar)
int ret = 0;
/* Using bitmap to manager UAR index */
ret = hns_roce_bitmap_alloc(&hr_dev->uar_table.bitmap, &uar->index);
ret = hns_roce_bitmap_alloc(&hr_dev->uar_table.bitmap, &uar->logic_idx);
if (ret == -1)
return -ENOMEM;
if (uar->index > 0)
uar->index = (uar->index - 1) %
if (uar->logic_idx > 0 && hr_dev->caps.phy_num_uars > 1)
uar->index = (uar->logic_idx - 1) %
(hr_dev->caps.phy_num_uars - 1) + 1;
else
uar->index = 0;
if (!dev_is_pci(hr_dev->dev)) {
res = platform_get_resource(hr_dev->pdev, IORESOURCE_MEM, 0);
@ -132,7 +134,7 @@ int hns_roce_uar_alloc(struct hns_roce_dev *hr_dev, struct hns_roce_uar *uar)
void hns_roce_uar_free(struct hns_roce_dev *hr_dev, struct hns_roce_uar *uar)
{
hns_roce_bitmap_free(&hr_dev->uar_table.bitmap, uar->index,
hns_roce_bitmap_free(&hr_dev->uar_table.bitmap, uar->logic_idx,
BITMAP_NO_RR);
}