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IB/umem: Add contiguous ODP support

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Currenlty ODP supports only regular MMU pages.
Add ODP support for regions consisting of physically contiguous chunks
of arbitrary order (huge pages for instance) to improve performance.

Signed-off-by: Artemy Kovalyov <artemyko@mellanox.com>
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Artemy Kovalyov 2017-04-05 09:23:55 +03:00 committed by Doug Ledford
parent 4df4a5bac3
commit 403cd12e2c
2 changed files with 33 additions and 21 deletions
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50
drivers/infiniband/core/umem_odp.c
View File

@ -504,7 +504,6 @@ out:
static int ib_umem_odp_map_dma_single_page(
struct ib_umem *umem,
int page_index,
u64 base_virt_addr,
struct page *page,
u64 access_mask,
unsigned long current_seq)
@ -527,7 +526,7 @@ static int ib_umem_odp_map_dma_single_page(
if (!(umem->odp_data->dma_list[page_index])) {
dma_addr = ib_dma_map_page(dev,
page,
0, PAGE_SIZE,
0, BIT(umem->page_shift),
DMA_BIDIRECTIONAL);
if (ib_dma_mapping_error(dev, dma_addr)) {
ret = -EFAULT;
@ -555,8 +554,9 @@ out:
if (remove_existing_mapping && umem->context->invalidate_range) {
invalidate_page_trampoline(
umem,
base_virt_addr + (page_index * PAGE_SIZE),
base_virt_addr + ((page_index+1)*PAGE_SIZE),
ib_umem_start(umem) + (page_index >> umem->page_shift),
ib_umem_start(umem) + ((page_index + 1) >>
umem->page_shift),
NULL);
ret = -EAGAIN;
}
@ -595,10 +595,10 @@ int ib_umem_odp_map_dma_pages(struct ib_umem *umem, u64 user_virt, u64 bcnt,
struct task_struct *owning_process = NULL;
struct mm_struct *owning_mm = NULL;
struct page **local_page_list = NULL;
u64 off;
int j, k, ret = 0, start_idx, npages = 0;
u64 base_virt_addr;
u64 page_mask, off;
int j, k, ret = 0, start_idx, npages = 0, page_shift;
unsigned int flags = 0;
phys_addr_t p = 0;
if (access_mask == 0)
return -EINVAL;
@ -611,9 +611,10 @@ int ib_umem_odp_map_dma_pages(struct ib_umem *umem, u64 user_virt, u64 bcnt,
if (!local_page_list)
return -ENOMEM;
off = user_virt & (~PAGE_MASK);
user_virt = user_virt & PAGE_MASK;
base_virt_addr = user_virt;
page_shift = umem->page_shift;
page_mask = ~(BIT(page_shift) - 1);
off = user_virt & (~page_mask);
user_virt = user_virt & page_mask;
bcnt += off; /* Charge for the first page offset as well. */
owning_process = get_pid_task(umem->context->tgid, PIDTYPE_PID);
@ -631,13 +632,13 @@ int ib_umem_odp_map_dma_pages(struct ib_umem *umem, u64 user_virt, u64 bcnt,
if (access_mask & ODP_WRITE_ALLOWED_BIT)
flags |= FOLL_WRITE;
start_idx = (user_virt - ib_umem_start(umem)) >> PAGE_SHIFT;
start_idx = (user_virt - ib_umem_start(umem)) >> page_shift;
k = start_idx;
while (bcnt > 0) {
const size_t gup_num_pages =
min_t(size_t, ALIGN(bcnt, PAGE_SIZE) / PAGE_SIZE,
PAGE_SIZE / sizeof(struct page *));
const size_t gup_num_pages = min_t(size_t,
(bcnt + BIT(page_shift) - 1) >> page_shift,
PAGE_SIZE / sizeof(struct page *));
down_read(&owning_mm->mmap_sem);
/*
@ -656,14 +657,25 @@ int ib_umem_odp_map_dma_pages(struct ib_umem *umem, u64 user_virt, u64 bcnt,
break;
bcnt -= min_t(size_t, npages << PAGE_SHIFT, bcnt);
user_virt += npages << PAGE_SHIFT;
mutex_lock(&umem->odp_data->umem_mutex);
for (j = 0; j < npages; ++j) {
for (j = 0; j < npages; j++, user_virt += PAGE_SIZE) {
if (user_virt & ~page_mask) {
p += PAGE_SIZE;
if (page_to_phys(local_page_list[j]) != p) {
ret = -EFAULT;
break;
}
put_page(local_page_list[j]);
continue;
}
ret = ib_umem_odp_map_dma_single_page(
umem, k, base_virt_addr, local_page_list[j],
access_mask, current_seq);
umem, k, local_page_list[j],
access_mask, current_seq);
if (ret < 0)
break;
p = page_to_phys(local_page_list[j]);
k++;
}
mutex_unlock(&umem->odp_data->umem_mutex);
@ -708,7 +720,7 @@ void ib_umem_odp_unmap_dma_pages(struct ib_umem *umem, u64 virt,
* once. */
mutex_lock(&umem->odp_data->umem_mutex);
for (addr = virt; addr < bound; addr += BIT(umem->page_shift)) {
idx = (addr - ib_umem_start(umem)) / PAGE_SIZE;
idx = (addr - ib_umem_start(umem)) >> umem->page_shift;
if (umem->odp_data->page_list[idx]) {
struct page *page = umem->odp_data->page_list[idx];
dma_addr_t dma = umem->odp_data->dma_list[idx];

4
include/rdma/ib_umem.h
View File

@ -72,12 +72,12 @@ static inline unsigned long ib_umem_start(struct ib_umem *umem)
/* Returns the address of the page after the last one of an ODP umem. */
static inline unsigned long ib_umem_end(struct ib_umem *umem)
{
return PAGE_ALIGN(umem->address + umem->length);
return ALIGN(umem->address + umem->length, BIT(umem->page_shift));
}
static inline size_t ib_umem_num_pages(struct ib_umem *umem)
{
return (ib_umem_end(umem) - ib_umem_start(umem)) >> PAGE_SHIFT;
return (ib_umem_end(umem) - ib_umem_start(umem)) >> umem->page_shift;
}
#ifdef CONFIG_INFINIBAND_USER_MEM