diff options
Diffstat (limited to 'drivers/misc/mic/scif/scif_rma.c')
| -rw-r--r-- | drivers/misc/mic/scif/scif_rma.c | 1760 |
1 files changed, 0 insertions, 1760 deletions
diff --git a/drivers/misc/mic/scif/scif_rma.c b/drivers/misc/mic/scif/scif_rma.c deleted file mode 100644 index 18fb9d8b8a4b..000000000000 --- a/drivers/misc/mic/scif/scif_rma.c +++ /dev/null @@ -1,1760 +0,0 @@ -// 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; - - if (kernel) { - for (j = 0; j < pin->nr_pages; j++) { - if (pin->pages[j] && !kernel) { - if (writeable) - set_page_dirty_lock(pin->pages[j]); - put_page(pin->pages[j]); - } - } - } else - unpin_user_pages_dirty_lock(pin->pages, pin->nr_pages, - writeable); - 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: - * @scifdev: SCIF device - * @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: - * @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; - } - fallthrough; - 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 - * @scifdev: SCIF device - * @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 - * @scifdev: SCIF device - * @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 - * @scifdev: SCIF device - * @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 - * @scifdev: SCIF device - * @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 - * @scifdev: SCIF device - * @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 - * @scifdev: SCIF device - * @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 - * @scifdev: SCIF device - * @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 - * @scifdev: SCIF device - * @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 - * @scifdev: SCIF device - * @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 = pin_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 */ - unpin_user_pages(pinned_pages->pages, - pinned_pages->nr_pages); - 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); |