--- /dev/null
+/*
+ * 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);
--- /dev/null
+/*
+ * 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.
+ */
+
+#ifndef IB_UMEM_ODP_H
+#define IB_UMEM_ODP_H
+
+#include <rdma/ib_umem.h>
+
+struct ib_umem_odp {
+ /*
+ * An array of the pages included in the on-demand paging umem.
+ * Indices of pages that are currently not mapped into the device will
+ * contain NULL.
+ */
+ struct page **page_list;
+ /*
+ * An array of the same size as page_list, with DMA addresses mapped
+ * for pages the pages in page_list. The lower two bits designate
+ * access permissions. See ODP_READ_ALLOWED_BIT and
+ * ODP_WRITE_ALLOWED_BIT.
+ */
+ dma_addr_t *dma_list;
+ /*
+ * The umem_mutex protects the page_list and dma_list fields of an ODP
+ * umem, allowing only a single thread to map/unmap pages.
+ */
+ struct mutex umem_mutex;
+ void *private; /* for the HW driver to use. */
+};
+
+#ifdef CONFIG_INFINIBAND_ON_DEMAND_PAGING
+
+int ib_umem_odp_get(struct ib_ucontext *context, struct ib_umem *umem);
+
+void ib_umem_odp_release(struct ib_umem *umem);
+
+/*
+ * The lower 2 bits of the DMA address signal the R/W permissions for
+ * the entry. To upgrade the permissions, provide the appropriate
+ * bitmask to the map_dma_pages function.
+ *
+ * Be aware that upgrading a mapped address might result in change of
+ * the DMA address for the page.
+ */
+#define ODP_READ_ALLOWED_BIT (1<<0ULL)
+#define ODP_WRITE_ALLOWED_BIT (1<<1ULL)
+
+#define ODP_DMA_ADDR_MASK (~(ODP_READ_ALLOWED_BIT | ODP_WRITE_ALLOWED_BIT))
+
+int ib_umem_odp_map_dma_pages(struct ib_umem *umem, u64 start_offset, u64 bcnt,
+ u64 access_mask, unsigned long current_seq);
+
+void ib_umem_odp_unmap_dma_pages(struct ib_umem *umem, u64 start_offset,
+ u64 bound);
+
+#else /* CONFIG_INFINIBAND_ON_DEMAND_PAGING */
+
+static inline int ib_umem_odp_get(struct ib_ucontext *context,
+ struct ib_umem *umem)
+{
+ return -EINVAL;
+}
+
+static inline void ib_umem_odp_release(struct ib_umem *umem) {}
+
+#endif /* CONFIG_INFINIBAND_ON_DEMAND_PAGING */
+
+#endif /* IB_UMEM_ODP_H */
OSDN Git Service
