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RDMA/hns: Get rid of page operation after dma_alloc_coherent

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In general, dma_alloc_coherent() returns a CPU virtual address and
a DMA address, and we have no guarantee that the underlying memory
even has an associated struct page at all.

This patch gets rid of the page operation after dma_alloc_coherent,
and records the VA returned form dma_alloc_coherent in the struct
of hem in hns RoCE driver.

Fixes: 9a44353("IB/hns: Add driver files for hns RoCE driver")
Signed-off-by: Wei Hu (Xavier) <xavier.huwei@huawei.com>
Signed-off-by: Shaobo Xu <xushaobo2@huawei.com>
Signed-off-by: Lijun Ou <oulijun@huawei.com>
Signed-off-by: Yixian Liu <liuyixian@huawei.com>
Signed-off-by: Xiping Zhang (Francis) <zhangxiping3@huawei.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
This commit is contained in:
Wei Hu\(Xavier\) 2017-11-28 15:10:28 +08:00 committed by Jason Gunthorpe
parent b1c1583509
commit 378efe798e
2 changed files with 14 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

25
drivers/infiniband/hw/hns/hns_roce_hem.c
View File

@ -224,6 +224,7 @@ static struct hns_roce_hem *hns_roce_alloc_hem(struct hns_roce_dev *hr_dev,
sg_init_table(chunk->mem, HNS_ROCE_HEM_CHUNK_LEN);
chunk->npages = 0;
chunk->nsg = 0;
memset(chunk->buf, 0, sizeof(chunk->buf));
list_add_tail(&chunk->list, &hem->chunk_list);
}
@ -240,8 +241,7 @@ static struct hns_roce_hem *hns_roce_alloc_hem(struct hns_roce_dev *hr_dev,
if (!buf)
goto fail;
sg_set_buf(mem, buf, PAGE_SIZE << order);
WARN_ON(mem->offset);
chunk->buf[chunk->npages] = buf;
sg_dma_len(mem) = PAGE_SIZE << order;
++chunk->npages;
@ -267,8 +267,8 @@ void hns_roce_free_hem(struct hns_roce_dev *hr_dev, struct hns_roce_hem *hem)
list_for_each_entry_safe(chunk, tmp, &hem->chunk_list, list) {
for (i = 0; i < chunk->npages; ++i)
dma_free_coherent(hr_dev->dev,
chunk->mem[i].length,
lowmem_page_address(sg_page(&chunk->mem[i])),
sg_dma_len(&chunk->mem[i]),
chunk->buf[i],
sg_dma_address(&chunk->mem[i]));
kfree(chunk);
}
@ -722,11 +722,12 @@ void *hns_roce_table_find(struct hns_roce_dev *hr_dev,
struct hns_roce_hem_chunk *chunk;
struct hns_roce_hem_mhop mhop;
struct hns_roce_hem *hem;
struct page *page = NULL;
void *addr = NULL;
unsigned long mhop_obj = obj;
unsigned long obj_per_chunk;
unsigned long idx_offset;
int offset, dma_offset;
int length;
int i, j;
u32 hem_idx = 0;
@ -763,25 +764,25 @@ void *hns_roce_table_find(struct hns_roce_dev *hr_dev,
list_for_each_entry(chunk, &hem->chunk_list, list) {
for (i = 0; i < chunk->npages; ++i) {
length = sg_dma_len(&chunk->mem[i]);
if (dma_handle && dma_offset >= 0) {
if (sg_dma_len(&chunk->mem[i]) >
(u32)dma_offset)
if (length > (u32)dma_offset)
*dma_handle = sg_dma_address(
&chunk->mem[i]) + dma_offset;
dma_offset -= sg_dma_len(&chunk->mem[i]);
dma_offset -= length;
}
if (chunk->mem[i].length > (u32)offset) {
page = sg_page(&chunk->mem[i]);
if (length > (u32)offset) {
addr = chunk->buf[i] + offset;
goto out;
}
offset -= chunk->mem[i].length;
offset -= length;
}
}
out:
mutex_unlock(&table->mutex);
return page ? lowmem_page_address(page) + offset : NULL;
return addr;
}
EXPORT_SYMBOL_GPL(hns_roce_table_find);

1
drivers/infiniband/hw/hns/hns_roce_hem.h
View File

@ -78,6 +78,7 @@ struct hns_roce_hem_chunk {
int npages;
int nsg;
struct scatterlist mem[HNS_ROCE_HEM_CHUNK_LEN];
void *buf[HNS_ROCE_HEM_CHUNK_LEN];
};
struct hns_roce_hem {