![Tejun Heo](/assets/img/avatar_default.png)
percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
295 lines
7.8 KiB
C
295 lines
7.8 KiB
C
/*
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* Copyright (c) 2005 Topspin Communications. All rights reserved.
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* Copyright (c) 2005 Cisco Systems. All rights reserved.
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* Copyright (c) 2005 Mellanox Technologies. All rights reserved.
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*
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* This software is available to you under a choice of one of two
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* licenses. You may choose to be licensed under the terms of the GNU
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* General Public License (GPL) Version 2, available from the file
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* COPYING in the main directory of this source tree, or the
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* OpenIB.org BSD license below:
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*
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* Redistribution and use in source and binary forms, with or
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* without modification, are permitted provided that the following
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* conditions are met:
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*
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* - Redistributions of source code must retain the above
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* copyright notice, this list of conditions and the following
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* disclaimer.
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*
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* - Redistributions in binary form must reproduce the above
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* copyright notice, this list of conditions and the following
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* disclaimer in the documentation and/or other materials
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* provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
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* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
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* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
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* BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
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* ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
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* CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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* SOFTWARE.
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*/
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#include <linux/mm.h>
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#include <linux/dma-mapping.h>
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#include <linux/sched.h>
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#include <linux/hugetlb.h>
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#include <linux/dma-attrs.h>
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#include <linux/slab.h>
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#include "uverbs.h"
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#define IB_UMEM_MAX_PAGE_CHUNK \
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((PAGE_SIZE - offsetof(struct ib_umem_chunk, page_list)) / \
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((void *) &((struct ib_umem_chunk *) 0)->page_list[1] - \
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(void *) &((struct ib_umem_chunk *) 0)->page_list[0]))
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static void __ib_umem_release(struct ib_device *dev, struct ib_umem *umem, int dirty)
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{
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struct ib_umem_chunk *chunk, *tmp;
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int i;
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list_for_each_entry_safe(chunk, tmp, &umem->chunk_list, list) {
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ib_dma_unmap_sg(dev, chunk->page_list,
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chunk->nents, DMA_BIDIRECTIONAL);
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for (i = 0; i < chunk->nents; ++i) {
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struct page *page = sg_page(&chunk->page_list[i]);
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if (umem->writable && dirty)
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set_page_dirty_lock(page);
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put_page(page);
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}
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kfree(chunk);
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}
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}
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/**
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* ib_umem_get - Pin and DMA map userspace memory.
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* @context: userspace context to pin memory for
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* @addr: userspace virtual address to start at
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* @size: length of region to pin
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* @access: IB_ACCESS_xxx flags for memory being pinned
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* @dmasync: flush in-flight DMA when the memory region is written
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*/
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struct ib_umem *ib_umem_get(struct ib_ucontext *context, unsigned long addr,
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size_t size, int access, int dmasync)
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{
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struct ib_umem *umem;
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struct page **page_list;
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struct vm_area_struct **vma_list;
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struct ib_umem_chunk *chunk;
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unsigned long locked;
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unsigned long lock_limit;
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unsigned long cur_base;
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unsigned long npages;
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int ret;
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int off;
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int i;
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DEFINE_DMA_ATTRS(attrs);
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if (dmasync)
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dma_set_attr(DMA_ATTR_WRITE_BARRIER, &attrs);
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if (!can_do_mlock())
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return ERR_PTR(-EPERM);
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umem = kmalloc(sizeof *umem, GFP_KERNEL);
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if (!umem)
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return ERR_PTR(-ENOMEM);
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umem->context = context;
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umem->length = size;
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umem->offset = addr & ~PAGE_MASK;
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umem->page_size = PAGE_SIZE;
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/*
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* We ask for writable memory if any access flags other than
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* "remote read" are set. "Local write" and "remote write"
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* obviously require write access. "Remote atomic" can do
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* things like fetch and add, which will modify memory, and
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* "MW bind" can change permissions by binding a window.
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*/
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umem->writable = !!(access & ~IB_ACCESS_REMOTE_READ);
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/* We assume the memory is from hugetlb until proved otherwise */
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umem->hugetlb = 1;
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INIT_LIST_HEAD(&umem->chunk_list);
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page_list = (struct page **) __get_free_page(GFP_KERNEL);
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if (!page_list) {
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kfree(umem);
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return ERR_PTR(-ENOMEM);
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}
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/*
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* if we can't alloc the vma_list, it's not so bad;
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* just assume the memory is not hugetlb memory
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*/
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vma_list = (struct vm_area_struct **) __get_free_page(GFP_KERNEL);
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if (!vma_list)
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umem->hugetlb = 0;
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npages = PAGE_ALIGN(size + umem->offset) >> PAGE_SHIFT;
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down_write(¤t->mm->mmap_sem);
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locked = npages + current->mm->locked_vm;
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lock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT;
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if ((locked > lock_limit) && !capable(CAP_IPC_LOCK)) {
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ret = -ENOMEM;
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goto out;
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}
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cur_base = addr & PAGE_MASK;
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ret = 0;
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while (npages) {
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ret = get_user_pages(current, current->mm, cur_base,
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min_t(unsigned long, npages,
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PAGE_SIZE / sizeof (struct page *)),
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1, !umem->writable, page_list, vma_list);
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if (ret < 0)
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goto out;
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cur_base += ret * PAGE_SIZE;
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npages -= ret;
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off = 0;
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while (ret) {
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chunk = kmalloc(sizeof *chunk + sizeof (struct scatterlist) *
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min_t(int, ret, IB_UMEM_MAX_PAGE_CHUNK),
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GFP_KERNEL);
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if (!chunk) {
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ret = -ENOMEM;
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goto out;
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}
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chunk->nents = min_t(int, ret, IB_UMEM_MAX_PAGE_CHUNK);
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sg_init_table(chunk->page_list, chunk->nents);
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for (i = 0; i < chunk->nents; ++i) {
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if (vma_list &&
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!is_vm_hugetlb_page(vma_list[i + off]))
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umem->hugetlb = 0;
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sg_set_page(&chunk->page_list[i], page_list[i + off], PAGE_SIZE, 0);
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}
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chunk->nmap = ib_dma_map_sg_attrs(context->device,
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&chunk->page_list[0],
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chunk->nents,
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DMA_BIDIRECTIONAL,
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&attrs);
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if (chunk->nmap <= 0) {
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for (i = 0; i < chunk->nents; ++i)
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put_page(sg_page(&chunk->page_list[i]));
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kfree(chunk);
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ret = -ENOMEM;
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goto out;
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}
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ret -= chunk->nents;
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off += chunk->nents;
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list_add_tail(&chunk->list, &umem->chunk_list);
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}
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ret = 0;
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}
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out:
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if (ret < 0) {
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__ib_umem_release(context->device, umem, 0);
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kfree(umem);
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} else
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current->mm->locked_vm = locked;
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up_write(¤t->mm->mmap_sem);
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if (vma_list)
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free_page((unsigned long) vma_list);
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free_page((unsigned long) page_list);
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return ret < 0 ? ERR_PTR(ret) : umem;
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}
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EXPORT_SYMBOL(ib_umem_get);
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static void ib_umem_account(struct work_struct *work)
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{
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struct ib_umem *umem = container_of(work, struct ib_umem, work);
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down_write(&umem->mm->mmap_sem);
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umem->mm->locked_vm -= umem->diff;
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up_write(&umem->mm->mmap_sem);
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mmput(umem->mm);
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kfree(umem);
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}
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/**
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* ib_umem_release - release memory pinned with ib_umem_get
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* @umem: umem struct to release
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*/
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void ib_umem_release(struct ib_umem *umem)
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{
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struct ib_ucontext *context = umem->context;
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struct mm_struct *mm;
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unsigned long diff;
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__ib_umem_release(umem->context->device, umem, 1);
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mm = get_task_mm(current);
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if (!mm) {
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kfree(umem);
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return;
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}
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diff = PAGE_ALIGN(umem->length + umem->offset) >> PAGE_SHIFT;
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/*
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* We may be called with the mm's mmap_sem already held. This
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* can happen when a userspace munmap() is the call that drops
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* the last reference to our file and calls our release
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* method. If there are memory regions to destroy, we'll end
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* up here and not be able to take the mmap_sem. In that case
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* we defer the vm_locked accounting to the system workqueue.
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*/
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if (context->closing) {
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if (!down_write_trylock(&mm->mmap_sem)) {
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INIT_WORK(&umem->work, ib_umem_account);
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umem->mm = mm;
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umem->diff = diff;
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schedule_work(&umem->work);
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return;
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}
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} else
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down_write(&mm->mmap_sem);
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current->mm->locked_vm -= diff;
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up_write(&mm->mmap_sem);
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mmput(mm);
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kfree(umem);
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}
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EXPORT_SYMBOL(ib_umem_release);
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int ib_umem_page_count(struct ib_umem *umem)
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{
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struct ib_umem_chunk *chunk;
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int shift;
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int i;
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int n;
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shift = ilog2(umem->page_size);
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n = 0;
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list_for_each_entry(chunk, &umem->chunk_list, list)
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for (i = 0; i < chunk->nmap; ++i)
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n += sg_dma_len(&chunk->page_list[i]) >> shift;
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return n;
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}
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EXPORT_SYMBOL(ib_umem_page_count);
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