--- /dev/null
+/*
+ * Copyright (c) 2005 Topspin Communications. All rights reserved.
+ * Copyright (c) 2005 Mellanox Technologies. All rights reserved.
+ * Copyright (c) 2013 Cisco Systems. 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.h>
+#include <linux/hugetlb.h>
+#include <linux/dma-attrs.h>
+#include <linux/iommu.h>
+#include <linux/workqueue.h>
+#include <linux/list.h>
+#include <linux/pci.h>
+
+#include "usnic_log.h"
+#include "usnic_uiom.h"
+#include "usnic_uiom_interval_tree.h"
+
+static struct workqueue_struct *usnic_uiom_wq;
+
+#define USNIC_UIOM_PAGE_CHUNK \
+ ((PAGE_SIZE - offsetof(struct usnic_uiom_chunk, page_list)) /\
+ ((void *) &((struct usnic_uiom_chunk *) 0)->page_list[1] - \
+ (void *) &((struct usnic_uiom_chunk *) 0)->page_list[0]))
+
+static void usnic_uiom_reg_account(struct work_struct *work)
+{
+ struct usnic_uiom_reg *umem = container_of(work,
+ struct usnic_uiom_reg, work);
+
+ down_write(&umem->mm->mmap_sem);
+ umem->mm->locked_vm -= umem->diff;
+ up_write(&umem->mm->mmap_sem);
+ mmput(umem->mm);
+ kfree(umem);
+}
+
+static int usnic_uiom_dma_fault(struct iommu_domain *domain,
+ struct device *dev,
+ unsigned long iova, int flags,
+ void *token)
+{
+ usnic_err("Device %s iommu fault domain 0x%pK va 0x%lx flags 0x%x\n",
+ dev_name(dev),
+ domain, iova, flags);
+ return -ENOSYS;
+}
+
+static void usnic_uiom_put_pages(struct list_head *chunk_list, int dirty)
+{
+ struct usnic_uiom_chunk *chunk, *tmp;
+ struct page *page;
+ struct scatterlist *sg;
+ int i;
+ dma_addr_t pa;
+
+ list_for_each_entry_safe(chunk, tmp, chunk_list, list) {
+ for_each_sg(chunk->page_list, sg, chunk->nents, i) {
+ page = sg_page(sg);
+ pa = sg_phys(sg);
+ if (dirty)
+ set_page_dirty_lock(page);
+ put_page(page);
+ usnic_dbg("pa: %pa\n", &pa);
+ }
+ kfree(chunk);
+ }
+}
+
+static int usnic_uiom_get_pages(unsigned long addr, size_t size, int writable,
+ int dmasync, struct list_head *chunk_list)
+{
+ struct page **page_list;
+ struct scatterlist *sg;
+ struct usnic_uiom_chunk *chunk;
+ unsigned long locked;
+ unsigned long lock_limit;
+ unsigned long cur_base;
+ unsigned long npages;
+ int ret;
+ int off;
+ int i;
+ int flags;
+ dma_addr_t pa;
+ DEFINE_DMA_ATTRS(attrs);
+
+ if (dmasync)
+ dma_set_attr(DMA_ATTR_WRITE_BARRIER, &attrs);
+
+ if (!can_do_mlock())
+ return -EPERM;
+
+ INIT_LIST_HEAD(chunk_list);
+
+ page_list = (struct page **) __get_free_page(GFP_KERNEL);
+ if (!page_list)
+ return -ENOMEM;
+
+ npages = PAGE_ALIGN(size + (addr & ~PAGE_MASK)) >> PAGE_SHIFT;
+
+ down_write(¤t->mm->mmap_sem);
+
+ locked = npages + current->mm->locked_vm;
+ lock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT;
+
+ if ((locked > lock_limit) && !capable(CAP_IPC_LOCK)) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ flags = IOMMU_READ | IOMMU_CACHE;
+ flags |= (writable) ? IOMMU_WRITE : 0;
+ cur_base = addr & PAGE_MASK;
+ ret = 0;
+
+ while (npages) {
+ ret = get_user_pages(current, current->mm, cur_base,
+ min_t(unsigned long, npages,
+ PAGE_SIZE / sizeof(struct page *)),
+ 1, !writable, page_list, NULL);
+
+ if (ret < 0)
+ goto out;
+
+ npages -= ret;
+ off = 0;
+
+ while (ret) {
+ chunk = kmalloc(sizeof(*chunk) +
+ sizeof(struct scatterlist) *
+ min_t(int, ret, USNIC_UIOM_PAGE_CHUNK),
+ GFP_KERNEL);
+ if (!chunk) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ chunk->nents = min_t(int, ret, USNIC_UIOM_PAGE_CHUNK);
+ sg_init_table(chunk->page_list, chunk->nents);
+ for_each_sg(chunk->page_list, sg, chunk->nents, i) {
+ sg_set_page(sg, page_list[i + off],
+ PAGE_SIZE, 0);
+ pa = sg_phys(sg);
+ usnic_dbg("va: 0x%lx pa: %pa\n",
+ cur_base + i*PAGE_SIZE, &pa);
+ }
+ cur_base += chunk->nents * PAGE_SIZE;
+ ret -= chunk->nents;
+ off += chunk->nents;
+ list_add_tail(&chunk->list, chunk_list);
+ }
+
+ ret = 0;
+ }
+
+out:
+ if (ret < 0)
+ usnic_uiom_put_pages(chunk_list, 0);
+ else
+ current->mm->locked_vm = locked;
+
+ up_write(¤t->mm->mmap_sem);
+ free_page((unsigned long) page_list);
+ return ret;
+}
+
+static void usnic_uiom_unmap_sorted_intervals(struct list_head *intervals,
+ struct usnic_uiom_pd *pd)
+{
+ struct usnic_uiom_interval_node *interval, *tmp;
+ long unsigned va, size;
+
+ list_for_each_entry_safe(interval, tmp, intervals, link) {
+ va = interval->start << PAGE_SHIFT;
+ size = ((interval->last - interval->start) + 1) << PAGE_SHIFT;
+ while (size > 0) {
+ /* Workaround for RH 970401 */
+ usnic_dbg("va 0x%lx size 0x%lx", va, PAGE_SIZE);
+ iommu_unmap(pd->domain, va, PAGE_SIZE);
+ va += PAGE_SIZE;
+ size -= PAGE_SIZE;
+ }
+ }
+}
+
+static void __usnic_uiom_reg_release(struct usnic_uiom_pd *pd,
+ struct usnic_uiom_reg *uiomr,
+ int dirty)
+{
+ int npages;
+ unsigned long vpn_start, vpn_last;
+ struct usnic_uiom_interval_node *interval, *tmp;
+ int writable = 0;
+ LIST_HEAD(rm_intervals);
+
+ npages = PAGE_ALIGN(uiomr->length + uiomr->offset) >> PAGE_SHIFT;
+ vpn_start = (uiomr->va & PAGE_MASK) >> PAGE_SHIFT;
+ vpn_last = vpn_start + npages - 1;
+
+ spin_lock(&pd->lock);
+ usnic_uiom_remove_interval(&pd->rb_root, vpn_start,
+ vpn_last, &rm_intervals);
+ usnic_uiom_unmap_sorted_intervals(&rm_intervals, pd);
+
+ list_for_each_entry_safe(interval, tmp, &rm_intervals, link) {
+ if (interval->flags & IOMMU_WRITE)
+ writable = 1;
+ list_del(&interval->link);
+ kfree(interval);
+ }
+
+ usnic_uiom_put_pages(&uiomr->chunk_list, dirty & writable);
+ spin_unlock(&pd->lock);
+}
+
+static int usnic_uiom_map_sorted_intervals(struct list_head *intervals,
+ struct usnic_uiom_reg *uiomr)
+{
+ int i, err;
+ size_t size;
+ struct usnic_uiom_chunk *chunk;
+ struct usnic_uiom_interval_node *interval_node;
+ dma_addr_t pa;
+ dma_addr_t pa_start = 0;
+ dma_addr_t pa_end = 0;
+ long int va_start = -EINVAL;
+ struct usnic_uiom_pd *pd = uiomr->pd;
+ long int va = uiomr->va & PAGE_MASK;
+ int flags = IOMMU_READ | IOMMU_CACHE;
+
+ flags |= (uiomr->writable) ? IOMMU_WRITE : 0;
+ chunk = list_first_entry(&uiomr->chunk_list, struct usnic_uiom_chunk,
+ list);
+ list_for_each_entry(interval_node, intervals, link) {
+iter_chunk:
+ for (i = 0; i < chunk->nents; i++, va += PAGE_SIZE) {
+ pa = sg_phys(&chunk->page_list[i]);
+ if ((va >> PAGE_SHIFT) < interval_node->start)
+ continue;
+
+ if ((va >> PAGE_SHIFT) == interval_node->start) {
+ /* First page of the interval */
+ va_start = va;
+ pa_start = pa;
+ pa_end = pa;
+ }
+
+ WARN_ON(va_start == -EINVAL);
+
+ if ((pa_end + PAGE_SIZE != pa) &&
+ (pa != pa_start)) {
+ /* PAs are not contiguous */
+ size = pa_end - pa_start + PAGE_SIZE;
+ usnic_dbg("va 0x%lx pa %pa size 0x%zx flags 0x%x",
+ va_start, &pa_start, size, flags);
+ err = iommu_map(pd->domain, va_start, pa_start,
+ size, flags);
+ if (err) {
+ usnic_err("Failed to map va 0x%lx pa %pa size 0x%zx with err %d\n",
+ va_start, &pa_start, size, err);
+ goto err_out;
+ }
+ va_start = va;
+ pa_start = pa;
+ pa_end = pa;
+ }
+
+ if ((va >> PAGE_SHIFT) == interval_node->last) {
+ /* Last page of the interval */
+ size = pa - pa_start + PAGE_SIZE;
+ usnic_dbg("va 0x%lx pa %pa size 0x%zx flags 0x%x\n",
+ va_start, &pa_start, size, flags);
+ err = iommu_map(pd->domain, va_start, pa_start,
+ size, flags);
+ if (err) {
+ usnic_err("Failed to map va 0x%lx pa %pa size 0x%zx with err %d\n",
+ va_start, &pa_start, size, err);
+ goto err_out;
+ }
+ break;
+ }
+
+ if (pa != pa_start)
+ pa_end += PAGE_SIZE;
+ }
+
+ if (i == chunk->nents) {
+ /*
+ * Hit last entry of the chunk,
+ * hence advance to next chunk
+ */
+ chunk = list_first_entry(&chunk->list,
+ struct usnic_uiom_chunk,
+ list);
+ goto iter_chunk;
+ }
+ }
+
+ return 0;
+
+err_out:
+ usnic_uiom_unmap_sorted_intervals(intervals, pd);
+ return err;
+}
+
+struct usnic_uiom_reg *usnic_uiom_reg_get(struct usnic_uiom_pd *pd,
+ unsigned long addr, size_t size,
+ int writable, int dmasync)
+{
+ struct usnic_uiom_reg *uiomr;
+ unsigned long va_base, vpn_start, vpn_last;
+ unsigned long npages;
+ int offset, err;
+ LIST_HEAD(sorted_diff_intervals);
+
+ /*
+ * Intel IOMMU map throws an error if a translation entry is
+ * changed from read to write. This module may not unmap
+ * and then remap the entry after fixing the permission
+ * b/c this open up a small windows where hw DMA may page fault
+ * Hence, make all entries to be writable.
+ */
+ writable = 1;
+
+ va_base = addr & PAGE_MASK;
+ offset = addr & ~PAGE_MASK;
+ npages = PAGE_ALIGN(size + offset) >> PAGE_SHIFT;
+ vpn_start = (addr & PAGE_MASK) >> PAGE_SHIFT;
+ vpn_last = vpn_start + npages - 1;
+
+ uiomr = kmalloc(sizeof(*uiomr), GFP_KERNEL);
+ if (!uiomr)
+ return ERR_PTR(-ENOMEM);
+
+ uiomr->va = va_base;
+ uiomr->offset = offset;
+ uiomr->length = size;
+ uiomr->writable = writable;
+ uiomr->pd = pd;
+
+ err = usnic_uiom_get_pages(addr, size, writable, dmasync,
+ &uiomr->chunk_list);
+ if (err) {
+ usnic_err("Failed get_pages vpn [0x%lx,0x%lx] err %d\n",
+ vpn_start, vpn_last, err);
+ goto out_free_uiomr;
+ }
+
+ spin_lock(&pd->lock);
+ err = usnic_uiom_get_intervals_diff(vpn_start, vpn_last,
+ (writable) ? IOMMU_WRITE : 0,
+ IOMMU_WRITE,
+ &pd->rb_root,
+ &sorted_diff_intervals);
+ if (err) {
+ usnic_err("Failed disjoint interval vpn [0x%lx,0x%lx] err %d\n",
+ vpn_start, vpn_last, err);
+ goto out_put_pages;
+ }
+
+ err = usnic_uiom_map_sorted_intervals(&sorted_diff_intervals, uiomr);
+ if (err) {
+ usnic_err("Failed map interval vpn [0x%lx,0x%lx] err %d\n",
+ vpn_start, vpn_last, err);
+ goto out_put_intervals;
+
+ }
+
+ err = usnic_uiom_insert_interval(&pd->rb_root, vpn_start, vpn_last,
+ (writable) ? IOMMU_WRITE : 0);
+ if (err) {
+ usnic_err("Failed insert interval vpn [0x%lx,0x%lx] err %d\n",
+ vpn_start, vpn_last, err);
+ goto out_unmap_intervals;
+ }
+
+ usnic_uiom_put_interval_set(&sorted_diff_intervals);
+ spin_unlock(&pd->lock);
+
+ return uiomr;
+
+out_unmap_intervals:
+ usnic_uiom_unmap_sorted_intervals(&sorted_diff_intervals, pd);
+out_put_intervals:
+ usnic_uiom_put_interval_set(&sorted_diff_intervals);
+out_put_pages:
+ usnic_uiom_put_pages(&uiomr->chunk_list, 0);
+ spin_unlock(&pd->lock);
+out_free_uiomr:
+ kfree(uiomr);
+ return ERR_PTR(err);
+}
+
+void usnic_uiom_reg_release(struct usnic_uiom_reg *uiomr, int closing)
+{
+ struct mm_struct *mm;
+ unsigned long diff;
+
+ __usnic_uiom_reg_release(uiomr->pd, uiomr, 1);
+
+ mm = get_task_mm(current);
+ if (!mm) {
+ kfree(uiomr);
+ return;
+ }
+
+ diff = PAGE_ALIGN(uiomr->length + uiomr->offset) >> PAGE_SHIFT;
+
+ /*
+ * We may be called with the mm's mmap_sem already held. This
+ * can happen when a userspace munmap() is the call that drops
+ * the last reference to our file and calls our release
+ * method. If there are memory regions to destroy, we'll end
+ * up here and not be able to take the mmap_sem. In that case
+ * we defer the vm_locked accounting to the system workqueue.
+ */
+ if (closing) {
+ if (!down_write_trylock(&mm->mmap_sem)) {
+ INIT_WORK(&uiomr->work, usnic_uiom_reg_account);
+ uiomr->mm = mm;
+ uiomr->diff = diff;
+
+ queue_work(usnic_uiom_wq, &uiomr->work);
+ return;
+ }
+ } else
+ down_write(&mm->mmap_sem);
+
+ current->mm->locked_vm -= diff;
+ up_write(&mm->mmap_sem);
+ mmput(mm);
+ kfree(uiomr);
+}
+
+struct usnic_uiom_pd *usnic_uiom_alloc_pd(void)
+{
+ struct usnic_uiom_pd *pd;
+ void *domain;
+
+ pd = kzalloc(sizeof(*pd), GFP_KERNEL);
+ if (!pd)
+ return ERR_PTR(-ENOMEM);
+
+ pd->domain = domain = iommu_domain_alloc(&pci_bus_type);
+ if (IS_ERR_OR_NULL(domain)) {
+ usnic_err("Failed to allocate IOMMU domain with err %ld\n",
+ PTR_ERR(pd->domain));
+ kfree(pd);
+ return ERR_PTR(domain ? PTR_ERR(domain) : -ENOMEM);
+ }
+
+ iommu_set_fault_handler(pd->domain, usnic_uiom_dma_fault, NULL);
+
+ spin_lock_init(&pd->lock);
+ INIT_LIST_HEAD(&pd->devs);
+
+ return pd;
+}
+
+void usnic_uiom_dealloc_pd(struct usnic_uiom_pd *pd)
+{
+ iommu_domain_free(pd->domain);
+ kfree(pd);
+}
+
+int usnic_uiom_attach_dev_to_pd(struct usnic_uiom_pd *pd, struct device *dev)
+{
+ struct usnic_uiom_dev *uiom_dev;
+ int err;
+
+ uiom_dev = kzalloc(sizeof(*uiom_dev), GFP_ATOMIC);
+ if (!uiom_dev)
+ return -ENOMEM;
+ uiom_dev->dev = dev;
+
+ err = iommu_attach_device(pd->domain, dev);
+ if (err)
+ goto out_free_dev;
+
+ if (!iommu_capable(dev->bus, IOMMU_CAP_CACHE_COHERENCY)) {
+ usnic_err("IOMMU of %s does not support cache coherency\n",
+ dev_name(dev));
+ err = -EINVAL;
+ goto out_detach_device;
+ }
+
+ spin_lock(&pd->lock);
+ list_add_tail(&uiom_dev->link, &pd->devs);
+ pd->dev_cnt++;
+ spin_unlock(&pd->lock);
+
+ return 0;
+
+out_detach_device:
+ iommu_detach_device(pd->domain, dev);
+out_free_dev:
+ kfree(uiom_dev);
+ return err;
+}
+
+void usnic_uiom_detach_dev_from_pd(struct usnic_uiom_pd *pd, struct device *dev)
+{
+ struct usnic_uiom_dev *uiom_dev;
+ int found = 0;
+
+ spin_lock(&pd->lock);
+ list_for_each_entry(uiom_dev, &pd->devs, link) {
+ if (uiom_dev->dev == dev) {
+ found = 1;
+ break;
+ }
+ }
+
+ if (!found) {
+ usnic_err("Unable to free dev %s - not found\n",
+ dev_name(dev));
+ spin_unlock(&pd->lock);
+ return;
+ }
+
+ list_del(&uiom_dev->link);
+ pd->dev_cnt--;
+ spin_unlock(&pd->lock);
+
+ return iommu_detach_device(pd->domain, dev);
+}
+
+struct device **usnic_uiom_get_dev_list(struct usnic_uiom_pd *pd)
+{
+ struct usnic_uiom_dev *uiom_dev;
+ struct device **devs;
+ int i = 0;
+
+ spin_lock(&pd->lock);
+ devs = kcalloc(pd->dev_cnt + 1, sizeof(*devs), GFP_ATOMIC);
+ if (!devs) {
+ devs = ERR_PTR(-ENOMEM);
+ goto out;
+ }
+
+ list_for_each_entry(uiom_dev, &pd->devs, link) {
+ devs[i++] = uiom_dev->dev;
+ }
+out:
+ spin_unlock(&pd->lock);
+ return devs;
+}
+
+void usnic_uiom_free_dev_list(struct device **devs)
+{
+ kfree(devs);
+}
+
+int usnic_uiom_init(char *drv_name)
+{
+ if (!iommu_present(&pci_bus_type)) {
+ usnic_err("IOMMU required but not present or enabled. USNIC QPs will not function w/o enabling IOMMU\n");
+ return -EPERM;
+ }
+
+ usnic_uiom_wq = create_workqueue(drv_name);
+ if (!usnic_uiom_wq) {
+ usnic_err("Unable to alloc wq for drv %s\n", drv_name);
+ return -ENOMEM;
+ }
+
+ return 0;
+}
+
+void usnic_uiom_fini(void)
+{
+ flush_workqueue(usnic_uiom_wq);
+ destroy_workqueue(usnic_uiom_wq);
+}
Code Review / kvmfornfv.git / blobdiff