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RDMA/efa: Use API to get contiguous memory blocks aligned to device supported page size 

Use the ib_umem_find_best_pgsz() and rdma_for_each_block() API when
registering an MR instead of coding it in the driver.

ib_umem_find_best_pgsz() is used to find the best suitable page size
which replaces the existing efa_cont_pages() implementation.
rdma_for_each_block() is used to iterate the umem in aligned contiguous
memory blocks.

Reviewed-by: Firas JahJah <firasj@amazon.com>
Reviewed-by: Yossi Leybovich <sleybo@amazon.com>
Reviewed-by: Shiraz Saleem <shiraz.saleem@intel.com>
Signed-off-by: Gal Pressman <galpress@amazon.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Gal Pressman 2019-06-13 12:10:12 +03:00 committed by Doug Ledford
parent 4a9ceb7dba
commit 40ddb3f020
1 changed files with 21 additions and 67 deletions
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88
drivers/infiniband/hw/efa/efa_verbs.c
View File

@ -1011,21 +1011,15 @@ static int umem_to_page_list(struct efa_dev *dev,
u8 hp_shift)
{
u32 pages_in_hp = BIT(hp_shift - PAGE_SHIFT);
struct sg_dma_page_iter sg_iter;
unsigned int page_idx = 0;
struct ib_block_iter biter;
unsigned int hp_idx = 0;
ibdev_dbg(&dev->ibdev, "hp_cnt[%u], pages_in_hp[%u]\n",
hp_cnt, pages_in_hp);
for_each_sg_dma_page(umem->sg_head.sgl, &sg_iter, umem->nmap, 0) {
if (page_idx % pages_in_hp == 0) {
page_list[hp_idx] = sg_page_iter_dma_address(&sg_iter);
hp_idx++;
}
page_idx++;
}
rdma_for_each_block(umem->sg_head.sgl, &biter, umem->nmap,
BIT(hp_shift))
page_list[hp_idx++] = rdma_block_iter_dma_address(&biter);
return 0;
}
@ -1356,56 +1350,6 @@ static int efa_create_pbl(struct efa_dev *dev,
return 0;
}
static void efa_cont_pages(struct ib_umem *umem, u64 addr,
unsigned long max_page_shift,
int *count, u8 *shift, u32 *ncont)
{
struct scatterlist *sg;
u64 base = ~0, p = 0;
unsigned long tmp;
unsigned long m;
u64 len, pfn;
int i = 0;
int entry;
addr = addr >> PAGE_SHIFT;
tmp = (unsigned long)addr;
m = find_first_bit(&tmp, BITS_PER_LONG);
if (max_page_shift)
m = min_t(unsigned long, max_page_shift - PAGE_SHIFT, m);
for_each_sg(umem->sg_head.sgl, sg, umem->nmap, entry) {
len = DIV_ROUND_UP(sg_dma_len(sg), PAGE_SIZE);
pfn = sg_dma_address(sg) >> PAGE_SHIFT;
if (base + p != pfn) {
/*
* If either the offset or the new
* base are unaligned update m
*/
tmp = (unsigned long)(pfn | p);
if (!IS_ALIGNED(tmp, 1 << m))
m = find_first_bit(&tmp, BITS_PER_LONG);
base = pfn;
p = 0;
}
p += len;
i += len;
}
if (i) {
m = min_t(unsigned long, ilog2(roundup_pow_of_two(i)), m);
*ncont = DIV_ROUND_UP(i, (1 << m));
} else {
m = 0;
*ncont = 0;
}
*shift = PAGE_SHIFT + m;
*count = i;
}
struct ib_mr *efa_reg_mr(struct ib_pd *ibpd, u64 start, u64 length,
u64 virt_addr, int access_flags,
struct ib_udata *udata)
@ -1413,11 +1357,10 @@ struct ib_mr *efa_reg_mr(struct ib_pd *ibpd, u64 start, u64 length,
struct efa_dev *dev = to_edev(ibpd->device);
struct efa_com_reg_mr_params params = {};
struct efa_com_reg_mr_result result = {};
unsigned long max_page_shift;
struct pbl_context pbl;
unsigned int pg_sz;
struct efa_mr *mr;
int inline_size;
int npages;
int err;
if (udata->inlen &&
@ -1454,13 +1397,24 @@ struct ib_mr *efa_reg_mr(struct ib_pd *ibpd, u64 start, u64 length,
params.iova = virt_addr;
params.mr_length_in_bytes = length;
params.permissions = access_flags & 0x1;
max_page_shift = fls64(dev->dev_attr.page_size_cap);
efa_cont_pages(mr->umem, start, max_page_shift, &npages,
&params.page_shift, &params.page_num);
pg_sz = ib_umem_find_best_pgsz(mr->umem,
dev->dev_attr.page_size_cap,
virt_addr);
if (!pg_sz) {
err = -EOPNOTSUPP;
ibdev_dbg(&dev->ibdev, "Failed to find a suitable page size in page_size_cap %#llx\n",
dev->dev_attr.page_size_cap);
goto err_unmap;
}
params.page_shift = __ffs(pg_sz);
params.page_num = DIV_ROUND_UP(length + (start & (pg_sz - 1)),
pg_sz);
ibdev_dbg(&dev->ibdev,
"start %#llx length %#llx npages %d params.page_shift %u params.page_num %u\n",
start, length, npages, params.page_shift, params.page_num);
"start %#llx length %#llx params.page_shift %u params.page_num %u\n",
start, length, params.page_shift, params.page_num);
inline_size = ARRAY_SIZE(params.pbl.inline_pbl_array);
if (params.page_num <= inline_size) {