mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-28 11:18:45 +07:00
d10bcf947a
Combine contiguous regions of PAGE_SIZE pages into single scatter list entry while building the scatter table for a umem. This minimizes the number of the entries in the scatter list and reduces the DMA mapping overhead, particularly with the IOMMU. Set default max_seg_size in core for IB devices to 2G and do not combine if we exceed this limit. Also, purge npages in struct ib_umem as we now DMA map the umem SGL with sg_nents and npage computation is not needed. Drivers should now be using ib_umem_num_pages(), so fix the last stragglers. Move npages tracking to ib_umem_odp as ODP drivers still need it. Suggested-by: Jason Gunthorpe <jgg@ziepe.ca> Reviewed-by: Michael J. Ruhl <michael.j.ruhl@intel.com> Reviewed-by: Ira Weiny <ira.weiny@intel.com> Acked-by: Adit Ranadive <aditr@vmware.com> Signed-off-by: Shiraz Saleem <shiraz.saleem@intel.com> Tested-by: Gal Pressman <galpress@amazon.com> Tested-by: Selvin Xavier <selvin.xavier@broadcom.com> Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>
395 lines
9.9 KiB
C
395 lines
9.9 KiB
C
/*
|
|
* Copyright (c) 2005 Topspin Communications. All rights reserved.
|
|
* Copyright (c) 2005 Cisco Systems. All rights reserved.
|
|
* Copyright (c) 2005 Mellanox Technologies. All rights reserved.
|
|
*
|
|
* This software is available to you under a choice of one of two
|
|
* licenses. You may choose to be licensed under the terms of the GNU
|
|
* General Public License (GPL) Version 2, available from the file
|
|
* COPYING in the main directory of this source tree, or the
|
|
* OpenIB.org BSD license below:
|
|
*
|
|
* Redistribution and use in source and binary forms, with or
|
|
* without modification, are permitted provided that the following
|
|
* conditions are met:
|
|
*
|
|
* - Redistributions of source code must retain the above
|
|
* copyright notice, this list of conditions and the following
|
|
* disclaimer.
|
|
*
|
|
* - Redistributions in binary form must reproduce the above
|
|
* copyright notice, this list of conditions and the following
|
|
* disclaimer in the documentation and/or other materials
|
|
* provided with the distribution.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
|
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
|
|
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
|
|
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
|
|
* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
|
|
* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
|
|
* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
|
|
* SOFTWARE.
|
|
*/
|
|
|
|
#include <linux/mm.h>
|
|
#include <linux/dma-mapping.h>
|
|
#include <linux/sched/signal.h>
|
|
#include <linux/sched/mm.h>
|
|
#include <linux/export.h>
|
|
#include <linux/hugetlb.h>
|
|
#include <linux/slab.h>
|
|
#include <linux/pagemap.h>
|
|
#include <rdma/ib_umem_odp.h>
|
|
|
|
#include "uverbs.h"
|
|
|
|
static void __ib_umem_release(struct ib_device *dev, struct ib_umem *umem, int dirty)
|
|
{
|
|
struct sg_page_iter sg_iter;
|
|
struct page *page;
|
|
|
|
if (umem->nmap > 0)
|
|
ib_dma_unmap_sg(dev, umem->sg_head.sgl, umem->sg_nents,
|
|
DMA_BIDIRECTIONAL);
|
|
|
|
for_each_sg_page(umem->sg_head.sgl, &sg_iter, umem->sg_nents, 0) {
|
|
page = sg_page_iter_page(&sg_iter);
|
|
if (!PageDirty(page) && umem->writable && dirty)
|
|
set_page_dirty_lock(page);
|
|
put_page(page);
|
|
}
|
|
|
|
sg_free_table(&umem->sg_head);
|
|
}
|
|
|
|
/* ib_umem_add_sg_table - Add N contiguous pages to scatter table
|
|
*
|
|
* sg: current scatterlist entry
|
|
* page_list: array of npage struct page pointers
|
|
* npages: number of pages in page_list
|
|
* max_seg_sz: maximum segment size in bytes
|
|
* nents: [out] number of entries in the scatterlist
|
|
*
|
|
* Return new end of scatterlist
|
|
*/
|
|
static struct scatterlist *ib_umem_add_sg_table(struct scatterlist *sg,
|
|
struct page **page_list,
|
|
unsigned long npages,
|
|
unsigned int max_seg_sz,
|
|
int *nents)
|
|
{
|
|
unsigned long first_pfn;
|
|
unsigned long i = 0;
|
|
bool update_cur_sg = false;
|
|
bool first = !sg_page(sg);
|
|
|
|
/* Check if new page_list is contiguous with end of previous page_list.
|
|
* sg->length here is a multiple of PAGE_SIZE and sg->offset is 0.
|
|
*/
|
|
if (!first && (page_to_pfn(sg_page(sg)) + (sg->length >> PAGE_SHIFT) ==
|
|
page_to_pfn(page_list[0])))
|
|
update_cur_sg = true;
|
|
|
|
while (i != npages) {
|
|
unsigned long len;
|
|
struct page *first_page = page_list[i];
|
|
|
|
first_pfn = page_to_pfn(first_page);
|
|
|
|
/* Compute the number of contiguous pages we have starting
|
|
* at i
|
|
*/
|
|
for (len = 0; i != npages &&
|
|
first_pfn + len == page_to_pfn(page_list[i]);
|
|
len++)
|
|
i++;
|
|
|
|
/* Squash N contiguous pages from page_list into current sge */
|
|
if (update_cur_sg &&
|
|
((max_seg_sz - sg->length) >= (len << PAGE_SHIFT))) {
|
|
sg_set_page(sg, sg_page(sg),
|
|
sg->length + (len << PAGE_SHIFT), 0);
|
|
update_cur_sg = false;
|
|
continue;
|
|
}
|
|
|
|
/* Squash N contiguous pages into next sge or first sge */
|
|
if (!first)
|
|
sg = sg_next(sg);
|
|
|
|
(*nents)++;
|
|
sg_set_page(sg, first_page, len << PAGE_SHIFT, 0);
|
|
first = false;
|
|
}
|
|
|
|
return sg;
|
|
}
|
|
|
|
/**
|
|
* ib_umem_get - Pin and DMA map userspace memory.
|
|
*
|
|
* If access flags indicate ODP memory, avoid pinning. Instead, stores
|
|
* the mm for future page fault handling in conjunction with MMU notifiers.
|
|
*
|
|
* @udata: userspace context to pin memory for
|
|
* @addr: userspace virtual address to start at
|
|
* @size: length of region to pin
|
|
* @access: IB_ACCESS_xxx flags for memory being pinned
|
|
* @dmasync: flush in-flight DMA when the memory region is written
|
|
*/
|
|
struct ib_umem *ib_umem_get(struct ib_udata *udata, unsigned long addr,
|
|
size_t size, int access, int dmasync)
|
|
{
|
|
struct ib_ucontext *context;
|
|
struct ib_umem *umem;
|
|
struct page **page_list;
|
|
struct vm_area_struct **vma_list;
|
|
unsigned long lock_limit;
|
|
unsigned long new_pinned;
|
|
unsigned long cur_base;
|
|
struct mm_struct *mm;
|
|
unsigned long npages;
|
|
int ret;
|
|
int i;
|
|
unsigned long dma_attrs = 0;
|
|
struct scatterlist *sg;
|
|
unsigned int gup_flags = FOLL_WRITE;
|
|
|
|
if (!udata)
|
|
return ERR_PTR(-EIO);
|
|
|
|
context = container_of(udata, struct uverbs_attr_bundle, driver_udata)
|
|
->context;
|
|
if (!context)
|
|
return ERR_PTR(-EIO);
|
|
|
|
if (dmasync)
|
|
dma_attrs |= DMA_ATTR_WRITE_BARRIER;
|
|
|
|
/*
|
|
* If the combination of the addr and size requested for this memory
|
|
* region causes an integer overflow, return error.
|
|
*/
|
|
if (((addr + size) < addr) ||
|
|
PAGE_ALIGN(addr + size) < (addr + size))
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
if (!can_do_mlock())
|
|
return ERR_PTR(-EPERM);
|
|
|
|
if (access & IB_ACCESS_ON_DEMAND) {
|
|
umem = kzalloc(sizeof(struct ib_umem_odp), GFP_KERNEL);
|
|
if (!umem)
|
|
return ERR_PTR(-ENOMEM);
|
|
umem->is_odp = 1;
|
|
} else {
|
|
umem = kzalloc(sizeof(*umem), GFP_KERNEL);
|
|
if (!umem)
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
|
|
umem->context = context;
|
|
umem->length = size;
|
|
umem->address = addr;
|
|
umem->page_shift = PAGE_SHIFT;
|
|
umem->writable = ib_access_writable(access);
|
|
umem->owning_mm = mm = current->mm;
|
|
mmgrab(mm);
|
|
|
|
if (access & IB_ACCESS_ON_DEMAND) {
|
|
if (WARN_ON_ONCE(!context->invalidate_range)) {
|
|
ret = -EINVAL;
|
|
goto umem_kfree;
|
|
}
|
|
|
|
ret = ib_umem_odp_get(to_ib_umem_odp(umem), access);
|
|
if (ret)
|
|
goto umem_kfree;
|
|
return umem;
|
|
}
|
|
|
|
/* We assume the memory is from hugetlb until proved otherwise */
|
|
umem->hugetlb = 1;
|
|
|
|
page_list = (struct page **) __get_free_page(GFP_KERNEL);
|
|
if (!page_list) {
|
|
ret = -ENOMEM;
|
|
goto umem_kfree;
|
|
}
|
|
|
|
/*
|
|
* if we can't alloc the vma_list, it's not so bad;
|
|
* just assume the memory is not hugetlb memory
|
|
*/
|
|
vma_list = (struct vm_area_struct **) __get_free_page(GFP_KERNEL);
|
|
if (!vma_list)
|
|
umem->hugetlb = 0;
|
|
|
|
npages = ib_umem_num_pages(umem);
|
|
if (npages == 0 || npages > UINT_MAX) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
lock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT;
|
|
|
|
new_pinned = atomic64_add_return(npages, &mm->pinned_vm);
|
|
if (new_pinned > lock_limit && !capable(CAP_IPC_LOCK)) {
|
|
atomic64_sub(npages, &mm->pinned_vm);
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
|
|
cur_base = addr & PAGE_MASK;
|
|
|
|
ret = sg_alloc_table(&umem->sg_head, npages, GFP_KERNEL);
|
|
if (ret)
|
|
goto vma;
|
|
|
|
if (!umem->writable)
|
|
gup_flags |= FOLL_FORCE;
|
|
|
|
sg = umem->sg_head.sgl;
|
|
|
|
while (npages) {
|
|
down_read(&mm->mmap_sem);
|
|
ret = get_user_pages_longterm(cur_base,
|
|
min_t(unsigned long, npages,
|
|
PAGE_SIZE / sizeof (struct page *)),
|
|
gup_flags, page_list, vma_list);
|
|
if (ret < 0) {
|
|
up_read(&mm->mmap_sem);
|
|
goto umem_release;
|
|
}
|
|
|
|
cur_base += ret * PAGE_SIZE;
|
|
npages -= ret;
|
|
|
|
sg = ib_umem_add_sg_table(sg, page_list, ret,
|
|
dma_get_max_seg_size(context->device->dma_device),
|
|
&umem->sg_nents);
|
|
|
|
/* Continue to hold the mmap_sem as vma_list access
|
|
* needs to be protected.
|
|
*/
|
|
for (i = 0; i < ret && umem->hugetlb; i++) {
|
|
if (vma_list && !is_vm_hugetlb_page(vma_list[i]))
|
|
umem->hugetlb = 0;
|
|
}
|
|
|
|
up_read(&mm->mmap_sem);
|
|
}
|
|
|
|
sg_mark_end(sg);
|
|
|
|
umem->nmap = ib_dma_map_sg_attrs(context->device,
|
|
umem->sg_head.sgl,
|
|
umem->sg_nents,
|
|
DMA_BIDIRECTIONAL,
|
|
dma_attrs);
|
|
|
|
if (!umem->nmap) {
|
|
ret = -ENOMEM;
|
|
goto umem_release;
|
|
}
|
|
|
|
ret = 0;
|
|
goto out;
|
|
|
|
umem_release:
|
|
__ib_umem_release(context->device, umem, 0);
|
|
vma:
|
|
atomic64_sub(ib_umem_num_pages(umem), &mm->pinned_vm);
|
|
out:
|
|
if (vma_list)
|
|
free_page((unsigned long) vma_list);
|
|
free_page((unsigned long) page_list);
|
|
umem_kfree:
|
|
if (ret) {
|
|
mmdrop(umem->owning_mm);
|
|
kfree(umem);
|
|
}
|
|
return ret ? ERR_PTR(ret) : umem;
|
|
}
|
|
EXPORT_SYMBOL(ib_umem_get);
|
|
|
|
static void __ib_umem_release_tail(struct ib_umem *umem)
|
|
{
|
|
mmdrop(umem->owning_mm);
|
|
if (umem->is_odp)
|
|
kfree(to_ib_umem_odp(umem));
|
|
else
|
|
kfree(umem);
|
|
}
|
|
|
|
/**
|
|
* ib_umem_release - release memory pinned with ib_umem_get
|
|
* @umem: umem struct to release
|
|
*/
|
|
void ib_umem_release(struct ib_umem *umem)
|
|
{
|
|
if (umem->is_odp) {
|
|
ib_umem_odp_release(to_ib_umem_odp(umem));
|
|
__ib_umem_release_tail(umem);
|
|
return;
|
|
}
|
|
|
|
__ib_umem_release(umem->context->device, umem, 1);
|
|
|
|
atomic64_sub(ib_umem_num_pages(umem), &umem->owning_mm->pinned_vm);
|
|
__ib_umem_release_tail(umem);
|
|
}
|
|
EXPORT_SYMBOL(ib_umem_release);
|
|
|
|
int ib_umem_page_count(struct ib_umem *umem)
|
|
{
|
|
int i;
|
|
int n;
|
|
struct scatterlist *sg;
|
|
|
|
if (umem->is_odp)
|
|
return ib_umem_num_pages(umem);
|
|
|
|
n = 0;
|
|
for_each_sg(umem->sg_head.sgl, sg, umem->nmap, i)
|
|
n += sg_dma_len(sg) >> umem->page_shift;
|
|
|
|
return n;
|
|
}
|
|
EXPORT_SYMBOL(ib_umem_page_count);
|
|
|
|
/*
|
|
* Copy from the given ib_umem's pages to the given buffer.
|
|
*
|
|
* umem - the umem to copy from
|
|
* offset - offset to start copying from
|
|
* dst - destination buffer
|
|
* length - buffer length
|
|
*
|
|
* Returns 0 on success, or an error code.
|
|
*/
|
|
int ib_umem_copy_from(void *dst, struct ib_umem *umem, size_t offset,
|
|
size_t length)
|
|
{
|
|
size_t end = offset + length;
|
|
int ret;
|
|
|
|
if (offset > umem->length || length > umem->length - offset) {
|
|
pr_err("ib_umem_copy_from not in range. offset: %zd umem length: %zd end: %zd\n",
|
|
offset, umem->length, end);
|
|
return -EINVAL;
|
|
}
|
|
|
|
ret = sg_pcopy_to_buffer(umem->sg_head.sgl, ib_umem_num_pages(umem),
|
|
dst, length, offset + ib_umem_offset(umem));
|
|
|
|
if (ret < 0)
|
|
return ret;
|
|
else if (ret != length)
|
|
return -EINVAL;
|
|
else
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL(ib_umem_copy_from);
|