| // SPDX-License-Identifier: GPL-2.0-only |
| /* |
| * Intel MIC Platform Software Stack (MPSS) |
| * |
| * Copyright(c) 2015 Intel Corporation. |
| * |
| * Intel SCIF driver. |
| */ |
| #include <linux/intel-iommu.h> |
| #include <linux/pagemap.h> |
| #include <linux/sched/mm.h> |
| #include <linux/sched/signal.h> |
| |
| #include "scif_main.h" |
| #include "scif_map.h" |
| |
| /* Used to skip ulimit checks for registrations with SCIF_MAP_KERNEL flag */ |
| #define SCIF_MAP_ULIMIT 0x40 |
| |
| bool scif_ulimit_check = 1; |
| |
| /** |
| * scif_rma_ep_init: |
| * @ep: end point |
| * |
| * Initialize RMA per EP data structures. |
| */ |
| void scif_rma_ep_init(struct scif_endpt *ep) |
| { |
| struct scif_endpt_rma_info *rma = &ep->rma_info; |
| |
| mutex_init(&rma->rma_lock); |
| init_iova_domain(&rma->iovad, PAGE_SIZE, SCIF_IOVA_START_PFN); |
| spin_lock_init(&rma->tc_lock); |
| mutex_init(&rma->mmn_lock); |
| INIT_LIST_HEAD(&rma->reg_list); |
| INIT_LIST_HEAD(&rma->remote_reg_list); |
| atomic_set(&rma->tw_refcount, 0); |
| atomic_set(&rma->tcw_refcount, 0); |
| atomic_set(&rma->tcw_total_pages, 0); |
| atomic_set(&rma->fence_refcount, 0); |
| |
| rma->async_list_del = 0; |
| rma->dma_chan = NULL; |
| INIT_LIST_HEAD(&rma->mmn_list); |
| INIT_LIST_HEAD(&rma->vma_list); |
| init_waitqueue_head(&rma->markwq); |
| } |
| |
| /** |
| * scif_rma_ep_can_uninit: |
| * @ep: end point |
| * |
| * Returns 1 if an endpoint can be uninitialized and 0 otherwise. |
| */ |
| int scif_rma_ep_can_uninit(struct scif_endpt *ep) |
| { |
| int ret = 0; |
| |
| mutex_lock(&ep->rma_info.rma_lock); |
| /* Destroy RMA Info only if both lists are empty */ |
| if (list_empty(&ep->rma_info.reg_list) && |
| list_empty(&ep->rma_info.remote_reg_list) && |
| list_empty(&ep->rma_info.mmn_list) && |
| !atomic_read(&ep->rma_info.tw_refcount) && |
| !atomic_read(&ep->rma_info.tcw_refcount) && |
| !atomic_read(&ep->rma_info.fence_refcount)) |
| ret = 1; |
| mutex_unlock(&ep->rma_info.rma_lock); |
| return ret; |
| } |
| |
| /** |
| * scif_create_pinned_pages: |
| * @nr_pages: number of pages in window |
| * @prot: read/write protection |
| * |
| * Allocate and prepare a set of pinned pages. |
| */ |
| static struct scif_pinned_pages * |
| scif_create_pinned_pages(int nr_pages, int prot) |
| { |
| struct scif_pinned_pages *pin; |
| |
| might_sleep(); |
| pin = scif_zalloc(sizeof(*pin)); |
| if (!pin) |
| goto error; |
| |
| pin->pages = scif_zalloc(nr_pages * sizeof(*pin->pages)); |
| if (!pin->pages) |
| goto error_free_pinned_pages; |
| |
| pin->prot = prot; |
| pin->magic = SCIFEP_MAGIC; |
| return pin; |
| |
| error_free_pinned_pages: |
| scif_free(pin, sizeof(*pin)); |
| error: |
| return NULL; |
| } |
| |
| /** |
| * scif_destroy_pinned_pages: |
| * @pin: A set of pinned pages. |
| * |
| * Deallocate resources for pinned pages. |
| */ |
| static int scif_destroy_pinned_pages(struct scif_pinned_pages *pin) |
| { |
| int j; |
| int writeable = pin->prot & SCIF_PROT_WRITE; |
| int kernel = SCIF_MAP_KERNEL & pin->map_flags; |
| |
| for (j = 0; j < pin->nr_pages; j++) { |
| if (pin->pages[j] && !kernel) { |
| if (writeable) |
| SetPageDirty(pin->pages[j]); |
| put_page(pin->pages[j]); |
| } |
| } |
| |
| scif_free(pin->pages, |
| pin->nr_pages * sizeof(*pin->pages)); |
| scif_free(pin, sizeof(*pin)); |
| return 0; |
| } |
| |
| /* |
| * scif_create_window: |
| * @ep: end point |
| * @nr_pages: number of pages |
| * @offset: registration offset |
| * @temp: true if a temporary window is being created |
| * |
| * Allocate and prepare a self registration window. |
| */ |
| struct scif_window *scif_create_window(struct scif_endpt *ep, int nr_pages, |
| s64 offset, bool temp) |
| { |
| struct scif_window *window; |
| |
| might_sleep(); |
| window = scif_zalloc(sizeof(*window)); |
| if (!window) |
| goto error; |
| |
| window->dma_addr = scif_zalloc(nr_pages * sizeof(*window->dma_addr)); |
| if (!window->dma_addr) |
| goto error_free_window; |
| |
| window->num_pages = scif_zalloc(nr_pages * sizeof(*window->num_pages)); |
| if (!window->num_pages) |
| goto error_free_window; |
| |
| window->offset = offset; |
| window->ep = (u64)ep; |
| window->magic = SCIFEP_MAGIC; |
| window->reg_state = OP_IDLE; |
| init_waitqueue_head(&window->regwq); |
| window->unreg_state = OP_IDLE; |
| init_waitqueue_head(&window->unregwq); |
| INIT_LIST_HEAD(&window->list); |
| window->type = SCIF_WINDOW_SELF; |
| window->temp = temp; |
| return window; |
| |
| error_free_window: |
| scif_free(window->dma_addr, |
| nr_pages * sizeof(*window->dma_addr)); |
| scif_free(window, sizeof(*window)); |
| error: |
| return NULL; |
| } |
| |
| /** |
| * scif_destroy_incomplete_window: |
| * @ep: end point |
| * @window: registration window |
| * |
| * Deallocate resources for self window. |
| */ |
| static void scif_destroy_incomplete_window(struct scif_endpt *ep, |
| struct scif_window *window) |
| { |
| int err; |
| int nr_pages = window->nr_pages; |
| struct scif_allocmsg *alloc = &window->alloc_handle; |
| struct scifmsg msg; |
| |
| retry: |
| /* Wait for a SCIF_ALLOC_GNT/REJ message */ |
| err = wait_event_timeout(alloc->allocwq, |
| alloc->state != OP_IN_PROGRESS, |
| SCIF_NODE_ALIVE_TIMEOUT); |
| if (!err && scifdev_alive(ep)) |
| goto retry; |
| |
| mutex_lock(&ep->rma_info.rma_lock); |
| if (alloc->state == OP_COMPLETED) { |
| msg.uop = SCIF_FREE_VIRT; |
| msg.src = ep->port; |
| msg.payload[0] = ep->remote_ep; |
| msg.payload[1] = window->alloc_handle.vaddr; |
| msg.payload[2] = (u64)window; |
| msg.payload[3] = SCIF_REGISTER; |
| _scif_nodeqp_send(ep->remote_dev, &msg); |
| } |
| mutex_unlock(&ep->rma_info.rma_lock); |
| |
| scif_free_window_offset(ep, window, window->offset); |
| scif_free(window->dma_addr, nr_pages * sizeof(*window->dma_addr)); |
| scif_free(window->num_pages, nr_pages * sizeof(*window->num_pages)); |
| scif_free(window, sizeof(*window)); |
| } |
| |
| /** |
| * scif_unmap_window: |
| * @remote_dev: SCIF remote device |
| * @window: registration window |
| * |
| * Delete any DMA mappings created for a registered self window |
| */ |
| void scif_unmap_window(struct scif_dev *remote_dev, struct scif_window *window) |
| { |
| int j; |
| |
| if (scif_is_iommu_enabled() && !scifdev_self(remote_dev)) { |
| if (window->st) { |
| dma_unmap_sg(&remote_dev->sdev->dev, |
| window->st->sgl, window->st->nents, |
| DMA_BIDIRECTIONAL); |
| sg_free_table(window->st); |
| kfree(window->st); |
| window->st = NULL; |
| } |
| } else { |
| for (j = 0; j < window->nr_contig_chunks; j++) { |
| if (window->dma_addr[j]) { |
| scif_unmap_single(window->dma_addr[j], |
| remote_dev, |
| window->num_pages[j] << |
| PAGE_SHIFT); |
| window->dma_addr[j] = 0x0; |
| } |
| } |
| } |
| } |
| |
| static inline struct mm_struct *__scif_acquire_mm(void) |
| { |
| if (scif_ulimit_check) |
| return get_task_mm(current); |
| return NULL; |
| } |
| |
| static inline void __scif_release_mm(struct mm_struct *mm) |
| { |
| if (mm) |
| mmput(mm); |
| } |
| |
| static inline int |
| __scif_dec_pinned_vm_lock(struct mm_struct *mm, |
| int nr_pages) |
| { |
| if (!mm || !nr_pages || !scif_ulimit_check) |
| return 0; |
| |
| atomic64_sub(nr_pages, &mm->pinned_vm); |
| return 0; |
| } |
| |
| static inline int __scif_check_inc_pinned_vm(struct mm_struct *mm, |
| int nr_pages) |
| { |
| unsigned long locked, lock_limit; |
| |
| if (!mm || !nr_pages || !scif_ulimit_check) |
| return 0; |
| |
| lock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; |
| locked = atomic64_add_return(nr_pages, &mm->pinned_vm); |
| |
| if ((locked > lock_limit) && !capable(CAP_IPC_LOCK)) { |
| atomic64_sub(nr_pages, &mm->pinned_vm); |
| dev_err(scif_info.mdev.this_device, |
| "locked(%lu) > lock_limit(%lu)\n", |
| locked, lock_limit); |
| return -ENOMEM; |
| } |
| return 0; |
| } |
| |
| /** |
| * scif_destroy_window: |
| * @ep: end point |
| * @window: registration window |
| * |
| * Deallocate resources for self window. |
| */ |
| int scif_destroy_window(struct scif_endpt *ep, struct scif_window *window) |
| { |
| int j; |
| struct scif_pinned_pages *pinned_pages = window->pinned_pages; |
| int nr_pages = window->nr_pages; |
| |
| might_sleep(); |
| if (!window->temp && window->mm) { |
| __scif_dec_pinned_vm_lock(window->mm, window->nr_pages); |
| __scif_release_mm(window->mm); |
| window->mm = NULL; |
| } |
| |
| scif_free_window_offset(ep, window, window->offset); |
| scif_unmap_window(ep->remote_dev, window); |
| /* |
| * Decrement references for this set of pinned pages from |
| * this window. |
| */ |
| j = atomic_sub_return(1, &pinned_pages->ref_count); |
| if (j < 0) |
| dev_err(scif_info.mdev.this_device, |
| "%s %d incorrect ref count %d\n", |
| __func__, __LINE__, j); |
| /* |
| * If the ref count for pinned_pages is zero then someone |
| * has already called scif_unpin_pages() for it and we should |
| * destroy the page cache. |
| */ |
| if (!j) |
| scif_destroy_pinned_pages(window->pinned_pages); |
| scif_free(window->dma_addr, nr_pages * sizeof(*window->dma_addr)); |
| scif_free(window->num_pages, nr_pages * sizeof(*window->num_pages)); |
| window->magic = 0; |
| scif_free(window, sizeof(*window)); |
| return 0; |
| } |
| |
| /** |
| * scif_create_remote_lookup: |
| * @remote_dev: SCIF remote device |
| * @window: remote window |
| * |
| * Allocate and prepare lookup entries for the remote |
| * end to copy over the physical addresses. |
| * Returns 0 on success and appropriate errno on failure. |
| */ |
| static int scif_create_remote_lookup(struct scif_dev *remote_dev, |
| struct scif_window *window) |
| { |
| int i, j, err = 0; |
| int nr_pages = window->nr_pages; |
| bool vmalloc_dma_phys, vmalloc_num_pages; |
| |
| might_sleep(); |
| /* Map window */ |
| err = scif_map_single(&window->mapped_offset, |
| window, remote_dev, sizeof(*window)); |
| if (err) |
| goto error_window; |
| |
| /* Compute the number of lookup entries. 21 == 2MB Shift */ |
| window->nr_lookup = ALIGN(nr_pages * PAGE_SIZE, |
| ((2) * 1024 * 1024)) >> 21; |
| |
| window->dma_addr_lookup.lookup = |
| scif_alloc_coherent(&window->dma_addr_lookup.offset, |
| remote_dev, window->nr_lookup * |
| sizeof(*window->dma_addr_lookup.lookup), |
| GFP_KERNEL | __GFP_ZERO); |
| if (!window->dma_addr_lookup.lookup) { |
| err = -ENOMEM; |
| goto error_window; |
| } |
| |
| window->num_pages_lookup.lookup = |
| scif_alloc_coherent(&window->num_pages_lookup.offset, |
| remote_dev, window->nr_lookup * |
| sizeof(*window->num_pages_lookup.lookup), |
| GFP_KERNEL | __GFP_ZERO); |
| if (!window->num_pages_lookup.lookup) { |
| err = -ENOMEM; |
| goto error_window; |
| } |
| |
| vmalloc_dma_phys = is_vmalloc_addr(&window->dma_addr[0]); |
| vmalloc_num_pages = is_vmalloc_addr(&window->num_pages[0]); |
| |
| /* Now map each of the pages containing physical addresses */ |
| for (i = 0, j = 0; i < nr_pages; i += SCIF_NR_ADDR_IN_PAGE, j++) { |
| err = scif_map_page(&window->dma_addr_lookup.lookup[j], |
| vmalloc_dma_phys ? |
| vmalloc_to_page(&window->dma_addr[i]) : |
| virt_to_page(&window->dma_addr[i]), |
| remote_dev); |
| if (err) |
| goto error_window; |
| err = scif_map_page(&window->num_pages_lookup.lookup[j], |
| vmalloc_num_pages ? |
| vmalloc_to_page(&window->num_pages[i]) : |
| virt_to_page(&window->num_pages[i]), |
| remote_dev); |
| if (err) |
| goto error_window; |
| } |
| return 0; |
| error_window: |
| return err; |
| } |
| |
| /** |
| * scif_destroy_remote_lookup: |
| * @remote_dev: SCIF remote device |
| * @window: remote window |
| * |
| * Destroy lookup entries used for the remote |
| * end to copy over the physical addresses. |
| */ |
| static void scif_destroy_remote_lookup(struct scif_dev *remote_dev, |
| struct scif_window *window) |
| { |
| int i, j; |
| |
| if (window->nr_lookup) { |
| struct scif_rma_lookup *lup = &window->dma_addr_lookup; |
| struct scif_rma_lookup *npup = &window->num_pages_lookup; |
| |
| for (i = 0, j = 0; i < window->nr_pages; |
| i += SCIF_NR_ADDR_IN_PAGE, j++) { |
| if (lup->lookup && lup->lookup[j]) |
| scif_unmap_single(lup->lookup[j], |
| remote_dev, |
| PAGE_SIZE); |
| if (npup->lookup && npup->lookup[j]) |
| scif_unmap_single(npup->lookup[j], |
| remote_dev, |
| PAGE_SIZE); |
| } |
| if (lup->lookup) |
| scif_free_coherent(lup->lookup, lup->offset, |
| remote_dev, window->nr_lookup * |
| sizeof(*lup->lookup)); |
| if (npup->lookup) |
| scif_free_coherent(npup->lookup, npup->offset, |
| remote_dev, window->nr_lookup * |
| sizeof(*npup->lookup)); |
| if (window->mapped_offset) |
| scif_unmap_single(window->mapped_offset, |
| remote_dev, sizeof(*window)); |
| window->nr_lookup = 0; |
| } |
| } |
| |
| /** |
| * scif_create_remote_window: |
| * @ep: end point |
| * @nr_pages: number of pages in window |
| * |
| * Allocate and prepare a remote registration window. |
| */ |
| static struct scif_window * |
| scif_create_remote_window(struct scif_dev *scifdev, int nr_pages) |
| { |
| struct scif_window *window; |
| |
| might_sleep(); |
| window = scif_zalloc(sizeof(*window)); |
| if (!window) |
| goto error_ret; |
| |
| window->magic = SCIFEP_MAGIC; |
| window->nr_pages = nr_pages; |
| |
| window->dma_addr = scif_zalloc(nr_pages * sizeof(*window->dma_addr)); |
| if (!window->dma_addr) |
| goto error_window; |
| |
| window->num_pages = scif_zalloc(nr_pages * |
| sizeof(*window->num_pages)); |
| if (!window->num_pages) |
| goto error_window; |
| |
| if (scif_create_remote_lookup(scifdev, window)) |
| goto error_window; |
| |
| window->type = SCIF_WINDOW_PEER; |
| window->unreg_state = OP_IDLE; |
| INIT_LIST_HEAD(&window->list); |
| return window; |
| error_window: |
| scif_destroy_remote_window(window); |
| error_ret: |
| return NULL; |
| } |
| |
| /** |
| * scif_destroy_remote_window: |
| * @ep: end point |
| * @window: remote registration window |
| * |
| * Deallocate resources for remote window. |
| */ |
| void |
| scif_destroy_remote_window(struct scif_window *window) |
| { |
| scif_free(window->dma_addr, window->nr_pages * |
| sizeof(*window->dma_addr)); |
| scif_free(window->num_pages, window->nr_pages * |
| sizeof(*window->num_pages)); |
| window->magic = 0; |
| scif_free(window, sizeof(*window)); |
| } |
| |
| /** |
| * scif_iommu_map: create DMA mappings if the IOMMU is enabled |
| * @remote_dev: SCIF remote device |
| * @window: remote registration window |
| * |
| * Map the physical pages using dma_map_sg(..) and then detect the number |
| * of contiguous DMA mappings allocated |
| */ |
| static int scif_iommu_map(struct scif_dev *remote_dev, |
| struct scif_window *window) |
| { |
| struct scatterlist *sg; |
| int i, err; |
| scif_pinned_pages_t pin = window->pinned_pages; |
| |
| window->st = kzalloc(sizeof(*window->st), GFP_KERNEL); |
| if (!window->st) |
| return -ENOMEM; |
| |
| err = sg_alloc_table(window->st, window->nr_pages, GFP_KERNEL); |
| if (err) |
| return err; |
| |
| for_each_sg(window->st->sgl, sg, window->st->nents, i) |
| sg_set_page(sg, pin->pages[i], PAGE_SIZE, 0x0); |
| |
| err = dma_map_sg(&remote_dev->sdev->dev, window->st->sgl, |
| window->st->nents, DMA_BIDIRECTIONAL); |
| if (!err) |
| return -ENOMEM; |
| /* Detect contiguous ranges of DMA mappings */ |
| sg = window->st->sgl; |
| for (i = 0; sg; i++) { |
| dma_addr_t last_da; |
| |
| window->dma_addr[i] = sg_dma_address(sg); |
| window->num_pages[i] = sg_dma_len(sg) >> PAGE_SHIFT; |
| last_da = sg_dma_address(sg) + sg_dma_len(sg); |
| while ((sg = sg_next(sg)) && sg_dma_address(sg) == last_da) { |
| window->num_pages[i] += |
| (sg_dma_len(sg) >> PAGE_SHIFT); |
| last_da = window->dma_addr[i] + |
| sg_dma_len(sg); |
| } |
| window->nr_contig_chunks++; |
| } |
| return 0; |
| } |
| |
| /** |
| * scif_map_window: |
| * @remote_dev: SCIF remote device |
| * @window: self registration window |
| * |
| * Map pages of a window into the aperture/PCI. |
| * Also determine addresses required for DMA. |
| */ |
| int |
| scif_map_window(struct scif_dev *remote_dev, struct scif_window *window) |
| { |
| int i, j, k, err = 0, nr_contig_pages; |
| scif_pinned_pages_t pin; |
| phys_addr_t phys_prev, phys_curr; |
| |
| might_sleep(); |
| |
| pin = window->pinned_pages; |
| |
| if (intel_iommu_enabled && !scifdev_self(remote_dev)) |
| return scif_iommu_map(remote_dev, window); |
| |
| for (i = 0, j = 0; i < window->nr_pages; i += nr_contig_pages, j++) { |
| phys_prev = page_to_phys(pin->pages[i]); |
| nr_contig_pages = 1; |
| |
| /* Detect physically contiguous chunks */ |
| for (k = i + 1; k < window->nr_pages; k++) { |
| phys_curr = page_to_phys(pin->pages[k]); |
| if (phys_curr != (phys_prev + PAGE_SIZE)) |
| break; |
| phys_prev = phys_curr; |
| nr_contig_pages++; |
| } |
| window->num_pages[j] = nr_contig_pages; |
| window->nr_contig_chunks++; |
| if (scif_is_mgmt_node()) { |
| /* |
| * Management node has to deal with SMPT on X100 and |
| * hence the DMA mapping is required |
| */ |
| err = scif_map_single(&window->dma_addr[j], |
| phys_to_virt(page_to_phys( |
| pin->pages[i])), |
| remote_dev, |
| nr_contig_pages << PAGE_SHIFT); |
| if (err) |
| return err; |
| } else { |
| window->dma_addr[j] = page_to_phys(pin->pages[i]); |
| } |
| } |
| return err; |
| } |
| |
| /** |
| * scif_send_scif_unregister: |
| * @ep: end point |
| * @window: self registration window |
| * |
| * Send a SCIF_UNREGISTER message. |
| */ |
| static int scif_send_scif_unregister(struct scif_endpt *ep, |
| struct scif_window *window) |
| { |
| struct scifmsg msg; |
| |
| msg.uop = SCIF_UNREGISTER; |
| msg.src = ep->port; |
| msg.payload[0] = window->alloc_handle.vaddr; |
| msg.payload[1] = (u64)window; |
| return scif_nodeqp_send(ep->remote_dev, &msg); |
| } |
| |
| /** |
| * scif_unregister_window: |
| * @window: self registration window |
| * |
| * Send an unregistration request and wait for a response. |
| */ |
| int scif_unregister_window(struct scif_window *window) |
| { |
| int err = 0; |
| struct scif_endpt *ep = (struct scif_endpt *)window->ep; |
| bool send_msg = false; |
| |
| might_sleep(); |
| switch (window->unreg_state) { |
| case OP_IDLE: |
| { |
| window->unreg_state = OP_IN_PROGRESS; |
| send_msg = true; |
| } |
| /* fall through */ |
| case OP_IN_PROGRESS: |
| { |
| scif_get_window(window, 1); |
| mutex_unlock(&ep->rma_info.rma_lock); |
| if (send_msg) { |
| err = scif_send_scif_unregister(ep, window); |
| if (err) { |
| window->unreg_state = OP_COMPLETED; |
| goto done; |
| } |
| } else { |
| /* Return ENXIO since unregistration is in progress */ |
| mutex_lock(&ep->rma_info.rma_lock); |
| return -ENXIO; |
| } |
| retry: |
| /* Wait for a SCIF_UNREGISTER_(N)ACK message */ |
| err = wait_event_timeout(window->unregwq, |
| window->unreg_state != OP_IN_PROGRESS, |
| SCIF_NODE_ALIVE_TIMEOUT); |
| if (!err && scifdev_alive(ep)) |
| goto retry; |
| if (!err) { |
| err = -ENODEV; |
| window->unreg_state = OP_COMPLETED; |
| dev_err(scif_info.mdev.this_device, |
| "%s %d err %d\n", __func__, __LINE__, err); |
| } |
| if (err > 0) |
| err = 0; |
| done: |
| mutex_lock(&ep->rma_info.rma_lock); |
| scif_put_window(window, 1); |
| break; |
| } |
| case OP_FAILED: |
| { |
| if (!scifdev_alive(ep)) { |
| err = -ENODEV; |
| window->unreg_state = OP_COMPLETED; |
| } |
| break; |
| } |
| case OP_COMPLETED: |
| break; |
| default: |
| err = -ENODEV; |
| } |
| |
| if (window->unreg_state == OP_COMPLETED && window->ref_count) |
| scif_put_window(window, window->nr_pages); |
| |
| if (!window->ref_count) { |
| atomic_inc(&ep->rma_info.tw_refcount); |
| list_del_init(&window->list); |
| scif_free_window_offset(ep, window, window->offset); |
| mutex_unlock(&ep->rma_info.rma_lock); |
| if ((!!(window->pinned_pages->map_flags & SCIF_MAP_KERNEL)) && |
| scifdev_alive(ep)) { |
| scif_drain_dma_intr(ep->remote_dev->sdev, |
| ep->rma_info.dma_chan); |
| } else { |
| if (!__scif_dec_pinned_vm_lock(window->mm, |
| window->nr_pages)) { |
| __scif_release_mm(window->mm); |
| window->mm = NULL; |
| } |
| } |
| scif_queue_for_cleanup(window, &scif_info.rma); |
| mutex_lock(&ep->rma_info.rma_lock); |
| } |
| return err; |
| } |
| |
| /** |
| * scif_send_alloc_request: |
| * @ep: end point |
| * @window: self registration window |
| * |
| * Send a remote window allocation request |
| */ |
| static int scif_send_alloc_request(struct scif_endpt *ep, |
| struct scif_window *window) |
| { |
| struct scifmsg msg; |
| struct scif_allocmsg *alloc = &window->alloc_handle; |
| |
| /* Set up the Alloc Handle */ |
| alloc->state = OP_IN_PROGRESS; |
| init_waitqueue_head(&alloc->allocwq); |
| |
| /* Send out an allocation request */ |
| msg.uop = SCIF_ALLOC_REQ; |
| msg.payload[1] = window->nr_pages; |
| msg.payload[2] = (u64)&window->alloc_handle; |
| return _scif_nodeqp_send(ep->remote_dev, &msg); |
| } |
| |
| /** |
| * scif_prep_remote_window: |
| * @ep: end point |
| * @window: self registration window |
| * |
| * Send a remote window allocation request, wait for an allocation response, |
| * and prepares the remote window by copying over the page lists |
| */ |
| static int scif_prep_remote_window(struct scif_endpt *ep, |
| struct scif_window *window) |
| { |
| struct scifmsg msg; |
| struct scif_window *remote_window; |
| struct scif_allocmsg *alloc = &window->alloc_handle; |
| dma_addr_t *dma_phys_lookup, *tmp, *num_pages_lookup, *tmp1; |
| int i = 0, j = 0; |
| int nr_contig_chunks, loop_nr_contig_chunks; |
| int remaining_nr_contig_chunks, nr_lookup; |
| int err, map_err; |
| |
| map_err = scif_map_window(ep->remote_dev, window); |
| if (map_err) |
| dev_err(&ep->remote_dev->sdev->dev, |
| "%s %d map_err %d\n", __func__, __LINE__, map_err); |
| remaining_nr_contig_chunks = window->nr_contig_chunks; |
| nr_contig_chunks = window->nr_contig_chunks; |
| retry: |
| /* Wait for a SCIF_ALLOC_GNT/REJ message */ |
| err = wait_event_timeout(alloc->allocwq, |
| alloc->state != OP_IN_PROGRESS, |
| SCIF_NODE_ALIVE_TIMEOUT); |
| mutex_lock(&ep->rma_info.rma_lock); |
| /* Synchronize with the thread waking up allocwq */ |
| mutex_unlock(&ep->rma_info.rma_lock); |
| if (!err && scifdev_alive(ep)) |
| goto retry; |
| |
| if (!err) |
| err = -ENODEV; |
| |
| if (err > 0) |
| err = 0; |
| else |
| return err; |
| |
| /* Bail out. The remote end rejected this request */ |
| if (alloc->state == OP_FAILED) |
| return -ENOMEM; |
| |
| if (map_err) { |
| dev_err(&ep->remote_dev->sdev->dev, |
| "%s %d err %d\n", __func__, __LINE__, map_err); |
| msg.uop = SCIF_FREE_VIRT; |
| msg.src = ep->port; |
| msg.payload[0] = ep->remote_ep; |
| msg.payload[1] = window->alloc_handle.vaddr; |
| msg.payload[2] = (u64)window; |
| msg.payload[3] = SCIF_REGISTER; |
| spin_lock(&ep->lock); |
| if (ep->state == SCIFEP_CONNECTED) |
| err = _scif_nodeqp_send(ep->remote_dev, &msg); |
| else |
| err = -ENOTCONN; |
| spin_unlock(&ep->lock); |
| return err; |
| } |
| |
| remote_window = scif_ioremap(alloc->phys_addr, sizeof(*window), |
| ep->remote_dev); |
| |
| /* Compute the number of lookup entries. 21 == 2MB Shift */ |
| nr_lookup = ALIGN(nr_contig_chunks, SCIF_NR_ADDR_IN_PAGE) |
| >> ilog2(SCIF_NR_ADDR_IN_PAGE); |
| |
| dma_phys_lookup = |
| scif_ioremap(remote_window->dma_addr_lookup.offset, |
| nr_lookup * |
| sizeof(*remote_window->dma_addr_lookup.lookup), |
| ep->remote_dev); |
| num_pages_lookup = |
| scif_ioremap(remote_window->num_pages_lookup.offset, |
| nr_lookup * |
| sizeof(*remote_window->num_pages_lookup.lookup), |
| ep->remote_dev); |
| |
| while (remaining_nr_contig_chunks) { |
| loop_nr_contig_chunks = min_t(int, remaining_nr_contig_chunks, |
| (int)SCIF_NR_ADDR_IN_PAGE); |
| /* #1/2 - Copy physical addresses over to the remote side */ |
| |
| /* #2/2 - Copy DMA addresses (addresses that are fed into the |
| * DMA engine) We transfer bus addresses which are then |
| * converted into a MIC physical address on the remote |
| * side if it is a MIC, if the remote node is a mgmt node we |
| * transfer the MIC physical address |
| */ |
| tmp = scif_ioremap(dma_phys_lookup[j], |
| loop_nr_contig_chunks * |
| sizeof(*window->dma_addr), |
| ep->remote_dev); |
| tmp1 = scif_ioremap(num_pages_lookup[j], |
| loop_nr_contig_chunks * |
| sizeof(*window->num_pages), |
| ep->remote_dev); |
| if (scif_is_mgmt_node()) { |
| memcpy_toio((void __force __iomem *)tmp, |
| &window->dma_addr[i], loop_nr_contig_chunks |
| * sizeof(*window->dma_addr)); |
| memcpy_toio((void __force __iomem *)tmp1, |
| &window->num_pages[i], loop_nr_contig_chunks |
| * sizeof(*window->num_pages)); |
| } else { |
| if (scifdev_is_p2p(ep->remote_dev)) { |
| /* |
| * add remote node's base address for this node |
| * to convert it into a MIC address |
| */ |
| int m; |
| dma_addr_t dma_addr; |
| |
| for (m = 0; m < loop_nr_contig_chunks; m++) { |
| dma_addr = window->dma_addr[i + m] + |
| ep->remote_dev->base_addr; |
| writeq(dma_addr, |
| (void __force __iomem *)&tmp[m]); |
| } |
| memcpy_toio((void __force __iomem *)tmp1, |
| &window->num_pages[i], |
| loop_nr_contig_chunks |
| * sizeof(*window->num_pages)); |
| } else { |
| /* Mgmt node or loopback - transfer DMA |
| * addresses as is, this is the same as a |
| * MIC physical address (we use the dma_addr |
| * and not the phys_addr array since the |
| * phys_addr is only setup if there is a mmap() |
| * request from the mgmt node) |
| */ |
| memcpy_toio((void __force __iomem *)tmp, |
| &window->dma_addr[i], |
| loop_nr_contig_chunks * |
| sizeof(*window->dma_addr)); |
| memcpy_toio((void __force __iomem *)tmp1, |
| &window->num_pages[i], |
| loop_nr_contig_chunks * |
| sizeof(*window->num_pages)); |
| } |
| } |
| remaining_nr_contig_chunks -= loop_nr_contig_chunks; |
| i += loop_nr_contig_chunks; |
| j++; |
| scif_iounmap(tmp, loop_nr_contig_chunks * |
| sizeof(*window->dma_addr), ep->remote_dev); |
| scif_iounmap(tmp1, loop_nr_contig_chunks * |
| sizeof(*window->num_pages), ep->remote_dev); |
| } |
| |
| /* Prepare the remote window for the peer */ |
| remote_window->peer_window = (u64)window; |
| remote_window->offset = window->offset; |
| remote_window->prot = window->prot; |
| remote_window->nr_contig_chunks = nr_contig_chunks; |
| remote_window->ep = ep->remote_ep; |
| scif_iounmap(num_pages_lookup, |
| nr_lookup * |
| sizeof(*remote_window->num_pages_lookup.lookup), |
| ep->remote_dev); |
| scif_iounmap(dma_phys_lookup, |
| nr_lookup * |
| sizeof(*remote_window->dma_addr_lookup.lookup), |
| ep->remote_dev); |
| scif_iounmap(remote_window, sizeof(*remote_window), ep->remote_dev); |
| window->peer_window = alloc->vaddr; |
| return err; |
| } |
| |
| /** |
| * scif_send_scif_register: |
| * @ep: end point |
| * @window: self registration window |
| * |
| * Send a SCIF_REGISTER message if EP is connected and wait for a |
| * SCIF_REGISTER_(N)ACK message else send a SCIF_FREE_VIRT |
| * message so that the peer can free its remote window allocated earlier. |
| */ |
| static int scif_send_scif_register(struct scif_endpt *ep, |
| struct scif_window *window) |
| { |
| int err = 0; |
| struct scifmsg msg; |
| |
| msg.src = ep->port; |
| msg.payload[0] = ep->remote_ep; |
| msg.payload[1] = window->alloc_handle.vaddr; |
| msg.payload[2] = (u64)window; |
| spin_lock(&ep->lock); |
| if (ep->state == SCIFEP_CONNECTED) { |
| msg.uop = SCIF_REGISTER; |
| window->reg_state = OP_IN_PROGRESS; |
| err = _scif_nodeqp_send(ep->remote_dev, &msg); |
| spin_unlock(&ep->lock); |
| if (!err) { |
| retry: |
| /* Wait for a SCIF_REGISTER_(N)ACK message */ |
| err = wait_event_timeout(window->regwq, |
| window->reg_state != |
| OP_IN_PROGRESS, |
| SCIF_NODE_ALIVE_TIMEOUT); |
| if (!err && scifdev_alive(ep)) |
| goto retry; |
| err = !err ? -ENODEV : 0; |
| if (window->reg_state == OP_FAILED) |
| err = -ENOTCONN; |
| } |
| } else { |
| msg.uop = SCIF_FREE_VIRT; |
| msg.payload[3] = SCIF_REGISTER; |
| err = _scif_nodeqp_send(ep->remote_dev, &msg); |
| spin_unlock(&ep->lock); |
| if (!err) |
| err = -ENOTCONN; |
| } |
| return err; |
| } |
| |
| /** |
| * scif_get_window_offset: |
| * @ep: end point descriptor |
| * @flags: flags |
| * @offset: offset hint |
| * @num_pages: number of pages |
| * @out_offset: computed offset returned by reference. |
| * |
| * Compute/Claim a new offset for this EP. |
| */ |
| int scif_get_window_offset(struct scif_endpt *ep, int flags, s64 offset, |
| int num_pages, s64 *out_offset) |
| { |
| s64 page_index; |
| struct iova *iova_ptr; |
| int err = 0; |
| |
| if (flags & SCIF_MAP_FIXED) { |
| page_index = SCIF_IOVA_PFN(offset); |
| iova_ptr = reserve_iova(&ep->rma_info.iovad, page_index, |
| page_index + num_pages - 1); |
| if (!iova_ptr) |
| err = -EADDRINUSE; |
| } else { |
| iova_ptr = alloc_iova(&ep->rma_info.iovad, num_pages, |
| SCIF_DMA_63BIT_PFN - 1, 0); |
| if (!iova_ptr) |
| err = -ENOMEM; |
| } |
| if (!err) |
| *out_offset = (iova_ptr->pfn_lo) << PAGE_SHIFT; |
| return err; |
| } |
| |
| /** |
| * scif_free_window_offset: |
| * @ep: end point descriptor |
| * @window: registration window |
| * @offset: Offset to be freed |
| * |
| * Free offset for this EP. The callee is supposed to grab |
| * the RMA mutex before calling this API. |
| */ |
| void scif_free_window_offset(struct scif_endpt *ep, |
| struct scif_window *window, s64 offset) |
| { |
| if ((window && !window->offset_freed) || !window) { |
| free_iova(&ep->rma_info.iovad, offset >> PAGE_SHIFT); |
| if (window) |
| window->offset_freed = true; |
| } |
| } |
| |
| /** |
| * scif_alloc_req: Respond to SCIF_ALLOC_REQ interrupt message |
| * @msg: Interrupt message |
| * |
| * Remote side is requesting a memory allocation. |
| */ |
| void scif_alloc_req(struct scif_dev *scifdev, struct scifmsg *msg) |
| { |
| int err; |
| struct scif_window *window = NULL; |
| int nr_pages = msg->payload[1]; |
| |
| window = scif_create_remote_window(scifdev, nr_pages); |
| if (!window) { |
| err = -ENOMEM; |
| goto error; |
| } |
| |
| /* The peer's allocation request is granted */ |
| msg->uop = SCIF_ALLOC_GNT; |
| msg->payload[0] = (u64)window; |
| msg->payload[1] = window->mapped_offset; |
| err = scif_nodeqp_send(scifdev, msg); |
| if (err) |
| scif_destroy_remote_window(window); |
| return; |
| error: |
| /* The peer's allocation request is rejected */ |
| dev_err(&scifdev->sdev->dev, |
| "%s %d error %d alloc_ptr %p nr_pages 0x%x\n", |
| __func__, __LINE__, err, window, nr_pages); |
| msg->uop = SCIF_ALLOC_REJ; |
| scif_nodeqp_send(scifdev, msg); |
| } |
| |
| /** |
| * scif_alloc_gnt_rej: Respond to SCIF_ALLOC_GNT/REJ interrupt message |
| * @msg: Interrupt message |
| * |
| * Remote side responded to a memory allocation. |
| */ |
| void scif_alloc_gnt_rej(struct scif_dev *scifdev, struct scifmsg *msg) |
| { |
| struct scif_allocmsg *handle = (struct scif_allocmsg *)msg->payload[2]; |
| struct scif_window *window = container_of(handle, struct scif_window, |
| alloc_handle); |
| struct scif_endpt *ep = (struct scif_endpt *)window->ep; |
| |
| mutex_lock(&ep->rma_info.rma_lock); |
| handle->vaddr = msg->payload[0]; |
| handle->phys_addr = msg->payload[1]; |
| if (msg->uop == SCIF_ALLOC_GNT) |
| handle->state = OP_COMPLETED; |
| else |
| handle->state = OP_FAILED; |
| wake_up(&handle->allocwq); |
| mutex_unlock(&ep->rma_info.rma_lock); |
| } |
| |
| /** |
| * scif_free_virt: Respond to SCIF_FREE_VIRT interrupt message |
| * @msg: Interrupt message |
| * |
| * Free up memory kmalloc'd earlier. |
| */ |
| void scif_free_virt(struct scif_dev *scifdev, struct scifmsg *msg) |
| { |
| struct scif_window *window = (struct scif_window *)msg->payload[1]; |
| |
| scif_destroy_remote_window(window); |
| } |
| |
| static void |
| scif_fixup_aper_base(struct scif_dev *dev, struct scif_window *window) |
| { |
| int j; |
| struct scif_hw_dev *sdev = dev->sdev; |
| phys_addr_t apt_base = 0; |
| |
| /* |
| * Add the aperture base if the DMA address is not card relative |
| * since the DMA addresses need to be an offset into the bar |
| */ |
| if (!scifdev_self(dev) && window->type == SCIF_WINDOW_PEER && |
| sdev->aper && !sdev->card_rel_da) |
| apt_base = sdev->aper->pa; |
| else |
| return; |
| |
| for (j = 0; j < window->nr_contig_chunks; j++) { |
| if (window->num_pages[j]) |
| window->dma_addr[j] += apt_base; |
| else |
| break; |
| } |
| } |
| |
| /** |
| * scif_recv_reg: Respond to SCIF_REGISTER interrupt message |
| * @msg: Interrupt message |
| * |
| * Update remote window list with a new registered window. |
| */ |
| void scif_recv_reg(struct scif_dev *scifdev, struct scifmsg *msg) |
| { |
| struct scif_endpt *ep = (struct scif_endpt *)msg->payload[0]; |
| struct scif_window *window = |
| (struct scif_window *)msg->payload[1]; |
| |
| mutex_lock(&ep->rma_info.rma_lock); |
| spin_lock(&ep->lock); |
| if (ep->state == SCIFEP_CONNECTED) { |
| msg->uop = SCIF_REGISTER_ACK; |
| scif_nodeqp_send(ep->remote_dev, msg); |
| scif_fixup_aper_base(ep->remote_dev, window); |
| /* No further failures expected. Insert new window */ |
| scif_insert_window(window, &ep->rma_info.remote_reg_list); |
| } else { |
| msg->uop = SCIF_REGISTER_NACK; |
| scif_nodeqp_send(ep->remote_dev, msg); |
| } |
| spin_unlock(&ep->lock); |
| mutex_unlock(&ep->rma_info.rma_lock); |
| /* free up any lookup resources now that page lists are transferred */ |
| scif_destroy_remote_lookup(ep->remote_dev, window); |
| /* |
| * We could not insert the window but we need to |
| * destroy the window. |
| */ |
| if (msg->uop == SCIF_REGISTER_NACK) |
| scif_destroy_remote_window(window); |
| } |
| |
| /** |
| * scif_recv_unreg: Respond to SCIF_UNREGISTER interrupt message |
| * @msg: Interrupt message |
| * |
| * Remove window from remote registration list; |
| */ |
| void scif_recv_unreg(struct scif_dev *scifdev, struct scifmsg *msg) |
| { |
| struct scif_rma_req req; |
| struct scif_window *window = NULL; |
| struct scif_window *recv_window = |
| (struct scif_window *)msg->payload[0]; |
| struct scif_endpt *ep; |
| int del_window = 0; |
| |
| ep = (struct scif_endpt *)recv_window->ep; |
| req.out_window = &window; |
| req.offset = recv_window->offset; |
| req.prot = 0; |
| req.nr_bytes = recv_window->nr_pages << PAGE_SHIFT; |
| req.type = SCIF_WINDOW_FULL; |
| req.head = &ep->rma_info.remote_reg_list; |
| msg->payload[0] = ep->remote_ep; |
| |
| mutex_lock(&ep->rma_info.rma_lock); |
| /* Does a valid window exist? */ |
| if (scif_query_window(&req)) { |
| dev_err(&scifdev->sdev->dev, |
| "%s %d -ENXIO\n", __func__, __LINE__); |
| msg->uop = SCIF_UNREGISTER_ACK; |
| goto error; |
| } |
| if (window) { |
| if (window->ref_count) |
| scif_put_window(window, window->nr_pages); |
| else |
| dev_err(&scifdev->sdev->dev, |
| "%s %d ref count should be +ve\n", |
| __func__, __LINE__); |
| window->unreg_state = OP_COMPLETED; |
| if (!window->ref_count) { |
| msg->uop = SCIF_UNREGISTER_ACK; |
| atomic_inc(&ep->rma_info.tw_refcount); |
| ep->rma_info.async_list_del = 1; |
| list_del_init(&window->list); |
| del_window = 1; |
| } else { |
| /* NACK! There are valid references to this window */ |
| msg->uop = SCIF_UNREGISTER_NACK; |
| } |
| } else { |
| /* The window did not make its way to the list at all. ACK */ |
| msg->uop = SCIF_UNREGISTER_ACK; |
| scif_destroy_remote_window(recv_window); |
| } |
| error: |
| mutex_unlock(&ep->rma_info.rma_lock); |
| if (del_window) |
| scif_drain_dma_intr(ep->remote_dev->sdev, |
| ep->rma_info.dma_chan); |
| scif_nodeqp_send(ep->remote_dev, msg); |
| if (del_window) |
| scif_queue_for_cleanup(window, &scif_info.rma); |
| } |
| |
| /** |
| * scif_recv_reg_ack: Respond to SCIF_REGISTER_ACK interrupt message |
| * @msg: Interrupt message |
| * |
| * Wake up the window waiting to complete registration. |
| */ |
| void scif_recv_reg_ack(struct scif_dev *scifdev, struct scifmsg *msg) |
| { |
| struct scif_window *window = |
| (struct scif_window *)msg->payload[2]; |
| struct scif_endpt *ep = (struct scif_endpt *)window->ep; |
| |
| mutex_lock(&ep->rma_info.rma_lock); |
| window->reg_state = OP_COMPLETED; |
| wake_up(&window->regwq); |
| mutex_unlock(&ep->rma_info.rma_lock); |
| } |
| |
| /** |
| * scif_recv_reg_nack: Respond to SCIF_REGISTER_NACK interrupt message |
| * @msg: Interrupt message |
| * |
| * Wake up the window waiting to inform it that registration |
| * cannot be completed. |
| */ |
| void scif_recv_reg_nack(struct scif_dev *scifdev, struct scifmsg *msg) |
| { |
| struct scif_window *window = |
| (struct scif_window *)msg->payload[2]; |
| struct scif_endpt *ep = (struct scif_endpt *)window->ep; |
| |
| mutex_lock(&ep->rma_info.rma_lock); |
| window->reg_state = OP_FAILED; |
| wake_up(&window->regwq); |
| mutex_unlock(&ep->rma_info.rma_lock); |
| } |
| |
| /** |
| * scif_recv_unreg_ack: Respond to SCIF_UNREGISTER_ACK interrupt message |
| * @msg: Interrupt message |
| * |
| * Wake up the window waiting to complete unregistration. |
| */ |
| void scif_recv_unreg_ack(struct scif_dev *scifdev, struct scifmsg *msg) |
| { |
| struct scif_window *window = |
| (struct scif_window *)msg->payload[1]; |
| struct scif_endpt *ep = (struct scif_endpt *)window->ep; |
| |
| mutex_lock(&ep->rma_info.rma_lock); |
| window->unreg_state = OP_COMPLETED; |
| wake_up(&window->unregwq); |
| mutex_unlock(&ep->rma_info.rma_lock); |
| } |
| |
| /** |
| * scif_recv_unreg_nack: Respond to SCIF_UNREGISTER_NACK interrupt message |
| * @msg: Interrupt message |
| * |
| * Wake up the window waiting to inform it that unregistration |
| * cannot be completed immediately. |
| */ |
| void scif_recv_unreg_nack(struct scif_dev *scifdev, struct scifmsg *msg) |
| { |
| struct scif_window *window = |
| (struct scif_window *)msg->payload[1]; |
| struct scif_endpt *ep = (struct scif_endpt *)window->ep; |
| |
| mutex_lock(&ep->rma_info.rma_lock); |
| window->unreg_state = OP_FAILED; |
| wake_up(&window->unregwq); |
| mutex_unlock(&ep->rma_info.rma_lock); |
| } |
| |
| int __scif_pin_pages(void *addr, size_t len, int *out_prot, |
| int map_flags, scif_pinned_pages_t *pages) |
| { |
| struct scif_pinned_pages *pinned_pages; |
| int nr_pages, err = 0, i; |
| bool vmalloc_addr = false; |
| bool try_upgrade = false; |
| int prot = *out_prot; |
| int ulimit = 0; |
| struct mm_struct *mm = NULL; |
| |
| /* Unsupported flags */ |
| if (map_flags & ~(SCIF_MAP_KERNEL | SCIF_MAP_ULIMIT)) |
| return -EINVAL; |
| ulimit = !!(map_flags & SCIF_MAP_ULIMIT); |
| |
| /* Unsupported protection requested */ |
| if (prot & ~(SCIF_PROT_READ | SCIF_PROT_WRITE)) |
| return -EINVAL; |
| |
| /* addr/len must be page aligned. len should be non zero */ |
| if (!len || |
| (ALIGN((u64)addr, PAGE_SIZE) != (u64)addr) || |
| (ALIGN((u64)len, PAGE_SIZE) != (u64)len)) |
| return -EINVAL; |
| |
| might_sleep(); |
| |
| nr_pages = len >> PAGE_SHIFT; |
| |
| /* Allocate a set of pinned pages */ |
| pinned_pages = scif_create_pinned_pages(nr_pages, prot); |
| if (!pinned_pages) |
| return -ENOMEM; |
| |
| if (map_flags & SCIF_MAP_KERNEL) { |
| if (is_vmalloc_addr(addr)) |
| vmalloc_addr = true; |
| |
| for (i = 0; i < nr_pages; i++) { |
| if (vmalloc_addr) |
| pinned_pages->pages[i] = |
| vmalloc_to_page(addr + (i * PAGE_SIZE)); |
| else |
| pinned_pages->pages[i] = |
| virt_to_page(addr + (i * PAGE_SIZE)); |
| } |
| pinned_pages->nr_pages = nr_pages; |
| pinned_pages->map_flags = SCIF_MAP_KERNEL; |
| } else { |
| /* |
| * SCIF supports registration caching. If a registration has |
| * been requested with read only permissions, then we try |
| * to pin the pages with RW permissions so that a subsequent |
| * transfer with RW permission can hit the cache instead of |
| * invalidating it. If the upgrade fails with RW then we |
| * revert back to R permission and retry |
| */ |
| if (prot == SCIF_PROT_READ) |
| try_upgrade = true; |
| prot |= SCIF_PROT_WRITE; |
| retry: |
| mm = current->mm; |
| if (ulimit) { |
| err = __scif_check_inc_pinned_vm(mm, nr_pages); |
| if (err) { |
| pinned_pages->nr_pages = 0; |
| goto error_unmap; |
| } |
| } |
| |
| pinned_pages->nr_pages = get_user_pages_fast( |
| (u64)addr, |
| nr_pages, |
| (prot & SCIF_PROT_WRITE) ? FOLL_WRITE : 0, |
| pinned_pages->pages); |
| if (nr_pages != pinned_pages->nr_pages) { |
| if (pinned_pages->nr_pages < 0) |
| pinned_pages->nr_pages = 0; |
| if (try_upgrade) { |
| if (ulimit) |
| __scif_dec_pinned_vm_lock(mm, nr_pages); |
| /* Roll back any pinned pages */ |
| for (i = 0; i < pinned_pages->nr_pages; i++) { |
| if (pinned_pages->pages[i]) |
| put_page( |
| pinned_pages->pages[i]); |
| } |
| prot &= ~SCIF_PROT_WRITE; |
| try_upgrade = false; |
| goto retry; |
| } |
| } |
| pinned_pages->map_flags = 0; |
| } |
| |
| if (pinned_pages->nr_pages < nr_pages) { |
| err = -EFAULT; |
| goto dec_pinned; |
| } |
| |
| *out_prot = prot; |
| atomic_set(&pinned_pages->ref_count, 1); |
| *pages = pinned_pages; |
| return err; |
| dec_pinned: |
| if (ulimit) |
| __scif_dec_pinned_vm_lock(mm, nr_pages); |
| /* Something went wrong! Rollback */ |
| error_unmap: |
| scif_destroy_pinned_pages(pinned_pages); |
| *pages = NULL; |
| dev_dbg(scif_info.mdev.this_device, |
| "%s %d err %d len 0x%lx\n", __func__, __LINE__, err, len); |
| return err; |
| } |
| |
| int scif_pin_pages(void *addr, size_t len, int prot, |
| int map_flags, scif_pinned_pages_t *pages) |
| { |
| return __scif_pin_pages(addr, len, &prot, map_flags, pages); |
| } |
| EXPORT_SYMBOL_GPL(scif_pin_pages); |
| |
| int scif_unpin_pages(scif_pinned_pages_t pinned_pages) |
| { |
| int err = 0, ret; |
| |
| if (!pinned_pages || SCIFEP_MAGIC != pinned_pages->magic) |
| return -EINVAL; |
| |
| ret = atomic_sub_return(1, &pinned_pages->ref_count); |
| if (ret < 0) { |
| dev_err(scif_info.mdev.this_device, |
| "%s %d scif_unpin_pages called without pinning? rc %d\n", |
| __func__, __LINE__, ret); |
| return -EINVAL; |
| } |
| /* |
| * Destroy the window if the ref count for this set of pinned |
| * pages has dropped to zero. If it is positive then there is |
| * a valid registered window which is backed by these pages and |
| * it will be destroyed once all such windows are unregistered. |
| */ |
| if (!ret) |
| err = scif_destroy_pinned_pages(pinned_pages); |
| |
| return err; |
| } |
| EXPORT_SYMBOL_GPL(scif_unpin_pages); |
| |
| static inline void |
| scif_insert_local_window(struct scif_window *window, struct scif_endpt *ep) |
| { |
| mutex_lock(&ep->rma_info.rma_lock); |
| scif_insert_window(window, &ep->rma_info.reg_list); |
| mutex_unlock(&ep->rma_info.rma_lock); |
| } |
| |
| off_t scif_register_pinned_pages(scif_epd_t epd, |
| scif_pinned_pages_t pinned_pages, |
| off_t offset, int map_flags) |
| { |
| struct scif_endpt *ep = (struct scif_endpt *)epd; |
| s64 computed_offset; |
| struct scif_window *window; |
| int err; |
| size_t len; |
| struct device *spdev; |
| |
| /* Unsupported flags */ |
| if (map_flags & ~SCIF_MAP_FIXED) |
| return -EINVAL; |
| |
| len = pinned_pages->nr_pages << PAGE_SHIFT; |
| |
| /* |
| * Offset is not page aligned/negative or offset+len |
| * wraps around with SCIF_MAP_FIXED. |
| */ |
| if ((map_flags & SCIF_MAP_FIXED) && |
| ((ALIGN(offset, PAGE_SIZE) != offset) || |
| (offset < 0) || |
| (len > LONG_MAX - offset))) |
| return -EINVAL; |
| |
| might_sleep(); |
| |
| err = scif_verify_epd(ep); |
| if (err) |
| return err; |
| /* |
| * It is an error to pass pinned_pages to scif_register_pinned_pages() |
| * after calling scif_unpin_pages(). |
| */ |
| if (!atomic_add_unless(&pinned_pages->ref_count, 1, 0)) |
| return -EINVAL; |
| |
| /* Compute the offset for this registration */ |
| err = scif_get_window_offset(ep, map_flags, offset, |
| len, &computed_offset); |
| if (err) { |
| atomic_sub(1, &pinned_pages->ref_count); |
| return err; |
| } |
| |
| /* Allocate and prepare self registration window */ |
| window = scif_create_window(ep, pinned_pages->nr_pages, |
| computed_offset, false); |
| if (!window) { |
| atomic_sub(1, &pinned_pages->ref_count); |
| scif_free_window_offset(ep, NULL, computed_offset); |
| return -ENOMEM; |
| } |
| |
| window->pinned_pages = pinned_pages; |
| window->nr_pages = pinned_pages->nr_pages; |
| window->prot = pinned_pages->prot; |
| |
| spdev = scif_get_peer_dev(ep->remote_dev); |
| if (IS_ERR(spdev)) { |
| err = PTR_ERR(spdev); |
| scif_destroy_window(ep, window); |
| return err; |
| } |
| err = scif_send_alloc_request(ep, window); |
| if (err) { |
| dev_err(&ep->remote_dev->sdev->dev, |
| "%s %d err %d\n", __func__, __LINE__, err); |
| goto error_unmap; |
| } |
| |
| /* Prepare the remote registration window */ |
| err = scif_prep_remote_window(ep, window); |
| if (err) { |
| dev_err(&ep->remote_dev->sdev->dev, |
| "%s %d err %d\n", __func__, __LINE__, err); |
| goto error_unmap; |
| } |
| |
| /* Tell the peer about the new window */ |
| err = scif_send_scif_register(ep, window); |
| if (err) { |
| dev_err(&ep->remote_dev->sdev->dev, |
| "%s %d err %d\n", __func__, __LINE__, err); |
| goto error_unmap; |
| } |
| |
| scif_put_peer_dev(spdev); |
| /* No further failures expected. Insert new window */ |
| scif_insert_local_window(window, ep); |
| return computed_offset; |
| error_unmap: |
| scif_destroy_window(ep, window); |
| scif_put_peer_dev(spdev); |
| dev_err(&ep->remote_dev->sdev->dev, |
| "%s %d err %d\n", __func__, __LINE__, err); |
| return err; |
| } |
| EXPORT_SYMBOL_GPL(scif_register_pinned_pages); |
| |
| off_t scif_register(scif_epd_t epd, void *addr, size_t len, off_t offset, |
| int prot, int map_flags) |
| { |
| scif_pinned_pages_t pinned_pages; |
| off_t err; |
| struct scif_endpt *ep = (struct scif_endpt *)epd; |
| s64 computed_offset; |
| struct scif_window *window; |
| struct mm_struct *mm = NULL; |
| struct device *spdev; |
| |
| dev_dbg(scif_info.mdev.this_device, |
| "SCIFAPI register: ep %p addr %p len 0x%lx offset 0x%lx prot 0x%x map_flags 0x%x\n", |
| epd, addr, len, offset, prot, map_flags); |
| /* Unsupported flags */ |
| if (map_flags & ~(SCIF_MAP_FIXED | SCIF_MAP_KERNEL)) |
| return -EINVAL; |
| |
| /* |
| * Offset is not page aligned/negative or offset+len |
| * wraps around with SCIF_MAP_FIXED. |
| */ |
| if ((map_flags & SCIF_MAP_FIXED) && |
| ((ALIGN(offset, PAGE_SIZE) != offset) || |
| (offset < 0) || |
| (len > LONG_MAX - offset))) |
| return -EINVAL; |
| |
| /* Unsupported protection requested */ |
| if (prot & ~(SCIF_PROT_READ | SCIF_PROT_WRITE)) |
| return -EINVAL; |
| |
| /* addr/len must be page aligned. len should be non zero */ |
| if (!len || (ALIGN((u64)addr, PAGE_SIZE) != (u64)addr) || |
| (ALIGN(len, PAGE_SIZE) != len)) |
| return -EINVAL; |
| |
| might_sleep(); |
| |
| err = scif_verify_epd(ep); |
| if (err) |
| return err; |
| |
| /* Compute the offset for this registration */ |
| err = scif_get_window_offset(ep, map_flags, offset, |
| len >> PAGE_SHIFT, &computed_offset); |
| if (err) |
| return err; |
| |
| spdev = scif_get_peer_dev(ep->remote_dev); |
| if (IS_ERR(spdev)) { |
| err = PTR_ERR(spdev); |
| scif_free_window_offset(ep, NULL, computed_offset); |
| return err; |
| } |
| /* Allocate and prepare self registration window */ |
| window = scif_create_window(ep, len >> PAGE_SHIFT, |
| computed_offset, false); |
| if (!window) { |
| scif_free_window_offset(ep, NULL, computed_offset); |
| scif_put_peer_dev(spdev); |
| return -ENOMEM; |
| } |
| |
| window->nr_pages = len >> PAGE_SHIFT; |
| |
| err = scif_send_alloc_request(ep, window); |
| if (err) { |
| scif_destroy_incomplete_window(ep, window); |
| scif_put_peer_dev(spdev); |
| return err; |
| } |
| |
| if (!(map_flags & SCIF_MAP_KERNEL)) { |
| mm = __scif_acquire_mm(); |
| map_flags |= SCIF_MAP_ULIMIT; |
| } |
| /* Pin down the pages */ |
| err = __scif_pin_pages(addr, len, &prot, |
| map_flags & (SCIF_MAP_KERNEL | SCIF_MAP_ULIMIT), |
| &pinned_pages); |
| if (err) { |
| scif_destroy_incomplete_window(ep, window); |
| __scif_release_mm(mm); |
| goto error; |
| } |
| |
| window->pinned_pages = pinned_pages; |
| window->prot = pinned_pages->prot; |
| window->mm = mm; |
| |
| /* Prepare the remote registration window */ |
| err = scif_prep_remote_window(ep, window); |
| if (err) { |
| dev_err(&ep->remote_dev->sdev->dev, |
| "%s %d err %ld\n", __func__, __LINE__, err); |
| goto error_unmap; |
| } |
| |
| /* Tell the peer about the new window */ |
| err = scif_send_scif_register(ep, window); |
| if (err) { |
| dev_err(&ep->remote_dev->sdev->dev, |
| "%s %d err %ld\n", __func__, __LINE__, err); |
| goto error_unmap; |
| } |
| |
| scif_put_peer_dev(spdev); |
| /* No further failures expected. Insert new window */ |
| scif_insert_local_window(window, ep); |
| dev_dbg(&ep->remote_dev->sdev->dev, |
| "SCIFAPI register: ep %p addr %p len 0x%lx computed_offset 0x%llx\n", |
| epd, addr, len, computed_offset); |
| return computed_offset; |
| error_unmap: |
| scif_destroy_window(ep, window); |
| error: |
| scif_put_peer_dev(spdev); |
| dev_err(&ep->remote_dev->sdev->dev, |
| "%s %d err %ld\n", __func__, __LINE__, err); |
| return err; |
| } |
| EXPORT_SYMBOL_GPL(scif_register); |
| |
| int |
| scif_unregister(scif_epd_t epd, off_t offset, size_t len) |
| { |
| struct scif_endpt *ep = (struct scif_endpt *)epd; |
| struct scif_window *window = NULL; |
| struct scif_rma_req req; |
| int nr_pages, err; |
| struct device *spdev; |
| |
| dev_dbg(scif_info.mdev.this_device, |
| "SCIFAPI unregister: ep %p offset 0x%lx len 0x%lx\n", |
| ep, offset, len); |
| /* len must be page aligned. len should be non zero */ |
| if (!len || |
| (ALIGN((u64)len, PAGE_SIZE) != (u64)len)) |
| return -EINVAL; |
| |
| /* Offset is not page aligned or offset+len wraps around */ |
| if ((ALIGN(offset, PAGE_SIZE) != offset) || |
| (offset < 0) || |
| (len > LONG_MAX - offset)) |
| return -EINVAL; |
| |
| err = scif_verify_epd(ep); |
| if (err) |
| return err; |
| |
| might_sleep(); |
| nr_pages = len >> PAGE_SHIFT; |
| |
| req.out_window = &window; |
| req.offset = offset; |
| req.prot = 0; |
| req.nr_bytes = len; |
| req.type = SCIF_WINDOW_FULL; |
| req.head = &ep->rma_info.reg_list; |
| |
| spdev = scif_get_peer_dev(ep->remote_dev); |
| if (IS_ERR(spdev)) { |
| err = PTR_ERR(spdev); |
| return err; |
| } |
| mutex_lock(&ep->rma_info.rma_lock); |
| /* Does a valid window exist? */ |
| err = scif_query_window(&req); |
| if (err) { |
| dev_err(&ep->remote_dev->sdev->dev, |
| "%s %d err %d\n", __func__, __LINE__, err); |
| goto error; |
| } |
| /* Unregister all the windows in this range */ |
| err = scif_rma_list_unregister(window, offset, nr_pages); |
| if (err) |
| dev_err(&ep->remote_dev->sdev->dev, |
| "%s %d err %d\n", __func__, __LINE__, err); |
| error: |
| mutex_unlock(&ep->rma_info.rma_lock); |
| scif_put_peer_dev(spdev); |
| return err; |
| } |
| EXPORT_SYMBOL_GPL(scif_unregister); |