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Commit 5b6eb54f authored by Wei Hu(Xavier)'s avatar Wei Hu(Xavier) Committed by Jason Gunthorpe
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RDMA/hns: Modify uar allocation algorithm to avoid bitmap exhaust 



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

Signed-off-by: default avatarWei Hu (Xavier) <xavier.huwei@huawei.com>
Reviewed-by: default avatarLeon Romanovsky <leonro@mellanox.com>
Signed-off-by: default avatarJason Gunthorpe <jgg@mellanox.com>
parent c62091bc

drivers/infiniband/hw/hns/hns_roce_device.h

+1 −0
Original line number Diff line number Diff line
@@ -214,6 +214,7 @@ enum { 
struct hns_roce_uar {

	u64		pfn;

	unsigned long	index;

	unsigned long	logic_idx;

};



struct hns_roce_ucontext {

drivers/infiniband/hw/hns/hns_roce_pd.c

+6 −4
Original line number Diff line number Diff line
@@ -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);

}