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author | Shachar Raindel <raindel@mellanox.com> | 2014-12-11 17:04:17 +0200 |
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committer | Roland Dreier <roland@purestorage.com> | 2014-12-15 18:13:36 -0800 |
commit | 8ada2c1c0c1d75a60723cd2ca7d49c594a146af6 (patch) | |
tree | a80d10bb8cf4888a7f6313698a40980de5724b51 /drivers/infiniband | |
parent | 860f10a799c83e38a69d5a69d80da5312a4c4106 (diff) | |
download | linux-stable-8ada2c1c0c1d75a60723cd2ca7d49c594a146af6.tar.gz linux-stable-8ada2c1c0c1d75a60723cd2ca7d49c594a146af6.tar.bz2 linux-stable-8ada2c1c0c1d75a60723cd2ca7d49c594a146af6.zip |
IB/core: Add support for on demand paging regions
* Extend the umem struct to keep the ODP related data.
* Allocate and initialize the ODP related information in the umem
(page_list, dma_list) and freeing as needed in the end of the run.
* Store a reference to the process PID struct in the ucontext. Used to
safely obtain the task_struct and the mm during fault handling,
without preventing the task destruction if needed.
* Add 2 helper functions: ib_umem_odp_map_dma_pages and
ib_umem_odp_unmap_dma_pages. These functions get the DMA addresses
of specific pages of the umem (and, currently, pin them).
* Support for page faults only - IB core will keep the reference on
the pages used and call put_page when freeing an ODP umem
area. Invalidations support will be added in a later patch.
Signed-off-by: Sagi Grimberg <sagig@mellanox.com>
Signed-off-by: Shachar Raindel <raindel@mellanox.com>
Signed-off-by: Haggai Eran <haggaie@mellanox.com>
Signed-off-by: Majd Dibbiny <majd@mellanox.com>
Signed-off-by: Roland Dreier <roland@purestorage.com>
Diffstat (limited to 'drivers/infiniband')
-rw-r--r-- | drivers/infiniband/core/Makefile | 1 | ||||
-rw-r--r-- | drivers/infiniband/core/umem.c | 24 | ||||
-rw-r--r-- | drivers/infiniband/core/umem_odp.c | 309 | ||||
-rw-r--r-- | drivers/infiniband/core/uverbs_cmd.c | 5 | ||||
-rw-r--r-- | drivers/infiniband/core/uverbs_main.c | 2 |
5 files changed, 341 insertions, 0 deletions
diff --git a/drivers/infiniband/core/Makefile b/drivers/infiniband/core/Makefile index ffd0af6734af..c58f7913c560 100644 --- a/drivers/infiniband/core/Makefile +++ b/drivers/infiniband/core/Makefile @@ -11,6 +11,7 @@ obj-$(CONFIG_INFINIBAND_USER_ACCESS) += ib_uverbs.o ib_ucm.o \ ib_core-y := packer.o ud_header.o verbs.o sysfs.o \ device.o fmr_pool.o cache.o netlink.o ib_core-$(CONFIG_INFINIBAND_USER_MEM) += umem.o +ib_core-$(CONFIG_INFINIBAND_ON_DEMAND_PAGING) += umem_odp.o ib_mad-y := mad.o smi.o agent.o mad_rmpp.o diff --git a/drivers/infiniband/core/umem.c b/drivers/infiniband/core/umem.c index c328e4693d14..5baceb79f21b 100644 --- a/drivers/infiniband/core/umem.c +++ b/drivers/infiniband/core/umem.c @@ -39,6 +39,7 @@ #include <linux/hugetlb.h> #include <linux/dma-attrs.h> #include <linux/slab.h> +#include <rdma/ib_umem_odp.h> #include "uverbs.h" @@ -69,6 +70,10 @@ static void __ib_umem_release(struct ib_device *dev, struct ib_umem *umem, int d /** * 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. + * * @context: userspace context to pin memory for * @addr: userspace virtual address to start at * @size: length of region to pin @@ -117,6 +122,17 @@ struct ib_umem *ib_umem_get(struct ib_ucontext *context, unsigned long addr, (IB_ACCESS_LOCAL_WRITE | IB_ACCESS_REMOTE_WRITE | IB_ACCESS_REMOTE_ATOMIC | IB_ACCESS_MW_BIND)); + if (access & IB_ACCESS_ON_DEMAND) { + ret = ib_umem_odp_get(context, umem); + if (ret) { + kfree(umem); + return ERR_PTR(ret); + } + return umem; + } + + umem->odp_data = NULL; + /* We assume the memory is from hugetlb until proved otherwise */ umem->hugetlb = 1; @@ -237,6 +253,11 @@ void ib_umem_release(struct ib_umem *umem) struct task_struct *task; unsigned long diff; + if (umem->odp_data) { + ib_umem_odp_release(umem); + return; + } + __ib_umem_release(umem->context->device, umem, 1); task = get_pid_task(umem->pid, PIDTYPE_PID); @@ -285,6 +306,9 @@ int ib_umem_page_count(struct ib_umem *umem) int n; struct scatterlist *sg; + if (umem->odp_data) + return ib_umem_num_pages(umem); + shift = ilog2(umem->page_size); n = 0; diff --git a/drivers/infiniband/core/umem_odp.c b/drivers/infiniband/core/umem_odp.c new file mode 100644 index 000000000000..f889e8d793bd --- /dev/null +++ b/drivers/infiniband/core/umem_odp.c @@ -0,0 +1,309 @@ +/* + * Copyright (c) 2014 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/types.h> +#include <linux/sched.h> +#include <linux/pid.h> +#include <linux/slab.h> +#include <linux/export.h> +#include <linux/vmalloc.h> + +#include <rdma/ib_verbs.h> +#include <rdma/ib_umem.h> +#include <rdma/ib_umem_odp.h> + +int ib_umem_odp_get(struct ib_ucontext *context, struct ib_umem *umem) +{ + int ret_val; + struct pid *our_pid; + + /* Prevent creating ODP MRs in child processes */ + rcu_read_lock(); + our_pid = get_task_pid(current->group_leader, PIDTYPE_PID); + rcu_read_unlock(); + put_pid(our_pid); + if (context->tgid != our_pid) + return -EINVAL; + + umem->hugetlb = 0; + umem->odp_data = kzalloc(sizeof(*umem->odp_data), GFP_KERNEL); + if (!umem->odp_data) + return -ENOMEM; + + mutex_init(&umem->odp_data->umem_mutex); + + umem->odp_data->page_list = vzalloc(ib_umem_num_pages(umem) * + sizeof(*umem->odp_data->page_list)); + if (!umem->odp_data->page_list) { + ret_val = -ENOMEM; + goto out_odp_data; + } + + umem->odp_data->dma_list = vzalloc(ib_umem_num_pages(umem) * + sizeof(*umem->odp_data->dma_list)); + if (!umem->odp_data->dma_list) { + ret_val = -ENOMEM; + goto out_page_list; + } + + return 0; + +out_page_list: + vfree(umem->odp_data->page_list); +out_odp_data: + kfree(umem->odp_data); + return ret_val; +} + +void ib_umem_odp_release(struct ib_umem *umem) +{ + /* + * Ensure that no more pages are mapped in the umem. + * + * It is the driver's responsibility to ensure, before calling us, + * that the hardware will not attempt to access the MR any more. + */ + ib_umem_odp_unmap_dma_pages(umem, ib_umem_start(umem), + ib_umem_end(umem)); + + vfree(umem->odp_data->dma_list); + vfree(umem->odp_data->page_list); + kfree(umem->odp_data); + kfree(umem); +} + +/* + * Map for DMA and insert a single page into the on-demand paging page tables. + * + * @umem: the umem to insert the page to. + * @page_index: index in the umem to add the page to. + * @page: the page struct to map and add. + * @access_mask: access permissions needed for this page. + * @current_seq: sequence number for synchronization with invalidations. + * the sequence number is taken from + * umem->odp_data->notifiers_seq. + * + * The function returns -EFAULT if the DMA mapping operation fails. + * + * The page is released via put_page even if the operation failed. For + * on-demand pinning, the page is released whenever it isn't stored in the + * umem. + */ +static int ib_umem_odp_map_dma_single_page( + struct ib_umem *umem, + int page_index, + struct page *page, + u64 access_mask, + unsigned long current_seq) +{ + struct ib_device *dev = umem->context->device; + dma_addr_t dma_addr; + int stored_page = 0; + int ret = 0; + + mutex_lock(&umem->odp_data->umem_mutex); + if (!(umem->odp_data->dma_list[page_index])) { + dma_addr = ib_dma_map_page(dev, + page, + 0, PAGE_SIZE, + DMA_BIDIRECTIONAL); + if (ib_dma_mapping_error(dev, dma_addr)) { + ret = -EFAULT; + goto out; + } + umem->odp_data->dma_list[page_index] = dma_addr | access_mask; + umem->odp_data->page_list[page_index] = page; + stored_page = 1; + } else if (umem->odp_data->page_list[page_index] == page) { + umem->odp_data->dma_list[page_index] |= access_mask; + } else { + pr_err("error: got different pages in IB device and from get_user_pages. IB device page: %p, gup page: %p\n", + umem->odp_data->page_list[page_index], page); + } + +out: + mutex_unlock(&umem->odp_data->umem_mutex); + + if (!stored_page) + put_page(page); + + return ret; +} + +/** + * ib_umem_odp_map_dma_pages - Pin and DMA map userspace memory in an ODP MR. + * + * Pins the range of pages passed in the argument, and maps them to + * DMA addresses. The DMA addresses of the mapped pages is updated in + * umem->odp_data->dma_list. + * + * Returns the number of pages mapped in success, negative error code + * for failure. + * + * @umem: the umem to map and pin + * @user_virt: the address from which we need to map. + * @bcnt: the minimal number of bytes to pin and map. The mapping might be + * bigger due to alignment, and may also be smaller in case of an error + * pinning or mapping a page. The actual pages mapped is returned in + * the return value. + * @access_mask: bit mask of the requested access permissions for the given + * range. + * @current_seq: the MMU notifiers sequance value for synchronization with + * invalidations. the sequance number is read from + * umem->odp_data->notifiers_seq before calling this function + */ +int ib_umem_odp_map_dma_pages(struct ib_umem *umem, u64 user_virt, u64 bcnt, + u64 access_mask, unsigned long current_seq) +{ + 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; + + if (access_mask == 0) + return -EINVAL; + + if (user_virt < ib_umem_start(umem) || + user_virt + bcnt > ib_umem_end(umem)) + return -EFAULT; + + local_page_list = (struct page **)__get_free_page(GFP_KERNEL); + if (!local_page_list) + return -ENOMEM; + + 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); + if (owning_process == NULL) { + ret = -EINVAL; + goto out_no_task; + } + + owning_mm = get_task_mm(owning_process); + if (owning_mm == NULL) { + ret = -EINVAL; + goto out_put_task; + } + + 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 *)); + + down_read(&owning_mm->mmap_sem); + /* + * Note: this might result in redundent page getting. We can + * avoid this by checking dma_list to be 0 before calling + * get_user_pages. However, this make the code much more + * complex (and doesn't gain us much performance in most use + * cases). + */ + npages = get_user_pages(owning_process, owning_mm, user_virt, + gup_num_pages, + access_mask & ODP_WRITE_ALLOWED_BIT, 0, + local_page_list, NULL); + up_read(&owning_mm->mmap_sem); + + if (npages < 0) + break; + + bcnt -= min_t(size_t, npages << PAGE_SHIFT, bcnt); + user_virt += npages << PAGE_SHIFT; + for (j = 0; j < npages; ++j) { + ret = ib_umem_odp_map_dma_single_page( + umem, k, local_page_list[j], access_mask, + current_seq); + if (ret < 0) + break; + k++; + } + + if (ret < 0) { + /* Release left over pages when handling errors. */ + for (++j; j < npages; ++j) + put_page(local_page_list[j]); + break; + } + } + + if (ret >= 0) { + if (npages < 0 && k == start_idx) + ret = npages; + else + ret = k - start_idx; + } + + mmput(owning_mm); +out_put_task: + put_task_struct(owning_process); +out_no_task: + free_page((unsigned long)local_page_list); + return ret; +} +EXPORT_SYMBOL(ib_umem_odp_map_dma_pages); + +void ib_umem_odp_unmap_dma_pages(struct ib_umem *umem, u64 virt, + u64 bound) +{ + int idx; + u64 addr; + struct ib_device *dev = umem->context->device; + + virt = max_t(u64, virt, ib_umem_start(umem)); + bound = min_t(u64, bound, ib_umem_end(umem)); + for (addr = virt; addr < bound; addr += (u64)umem->page_size) { + idx = (addr - ib_umem_start(umem)) / PAGE_SIZE; + mutex_lock(&umem->odp_data->umem_mutex); + if (umem->odp_data->page_list[idx]) { + struct page *page = umem->odp_data->page_list[idx]; + struct page *head_page = compound_head(page); + dma_addr_t dma = umem->odp_data->dma_list[idx]; + dma_addr_t dma_addr = dma & ODP_DMA_ADDR_MASK; + + WARN_ON(!dma_addr); + + ib_dma_unmap_page(dev, dma_addr, PAGE_SIZE, + DMA_BIDIRECTIONAL); + if (dma & ODP_WRITE_ALLOWED_BIT) + set_page_dirty_lock(head_page); + put_page(page); + } + mutex_unlock(&umem->odp_data->umem_mutex); + } +} +EXPORT_SYMBOL(ib_umem_odp_unmap_dma_pages); diff --git a/drivers/infiniband/core/uverbs_cmd.c b/drivers/infiniband/core/uverbs_cmd.c index f9326ccda4b5..70b697d8fbb3 100644 --- a/drivers/infiniband/core/uverbs_cmd.c +++ b/drivers/infiniband/core/uverbs_cmd.c @@ -36,6 +36,7 @@ #include <linux/file.h> #include <linux/fs.h> #include <linux/slab.h> +#include <linux/sched.h> #include <asm/uaccess.h> @@ -325,6 +326,9 @@ ssize_t ib_uverbs_get_context(struct ib_uverbs_file *file, INIT_LIST_HEAD(&ucontext->ah_list); INIT_LIST_HEAD(&ucontext->xrcd_list); INIT_LIST_HEAD(&ucontext->rule_list); + rcu_read_lock(); + ucontext->tgid = get_task_pid(current->group_leader, PIDTYPE_PID); + rcu_read_unlock(); ucontext->closing = 0; resp.num_comp_vectors = file->device->num_comp_vectors; @@ -371,6 +375,7 @@ err_fd: put_unused_fd(resp.async_fd); err_free: + put_pid(ucontext->tgid); ibdev->dealloc_ucontext(ucontext); err: diff --git a/drivers/infiniband/core/uverbs_main.c b/drivers/infiniband/core/uverbs_main.c index 974025028790..e6c23b9eab33 100644 --- a/drivers/infiniband/core/uverbs_main.c +++ b/drivers/infiniband/core/uverbs_main.c @@ -297,6 +297,8 @@ static int ib_uverbs_cleanup_ucontext(struct ib_uverbs_file *file, kfree(uobj); } + put_pid(context->tgid); + return context->device->dealloc_ucontext(context); } |