diff options
Diffstat (limited to 'drivers/misc/mic/scif/scif_rma.c')
| -rw-r--r-- | drivers/misc/mic/scif/scif_rma.c | 1775 |
1 files changed, 1775 insertions, 0 deletions
diff --git a/drivers/misc/mic/scif/scif_rma.c b/drivers/misc/mic/scif/scif_rma.c new file mode 100644 index 000000000..e1f59b177 --- /dev/null +++ b/drivers/misc/mic/scif/scif_rma.c @@ -0,0 +1,1775 @@ +/* + * Intel MIC Platform Software Stack (MPSS) + * + * Copyright(c) 2015 Intel Corporation. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License, version 2, as + * published by the Free Software Foundation. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + * General Public License for more details. + * + * Intel SCIF driver. + * + */ +#include <linux/dma_remapping.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, bool try_lock) +{ + if (!mm || !nr_pages || !scif_ulimit_check) + return 0; + if (try_lock) { + if (!down_write_trylock(&mm->mmap_sem)) { + dev_err(scif_info.mdev.this_device, + "%s %d err\n", __func__, __LINE__); + return -1; + } + } else { + down_write(&mm->mmap_sem); + } + mm->pinned_vm -= nr_pages; + up_write(&mm->mmap_sem); + 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; + + locked = nr_pages; + locked += mm->pinned_vm; + lock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT; + if ((locked > lock_limit) && !capable(CAP_IPC_LOCK)) { + dev_err(scif_info.mdev.this_device, + "locked(%lu) > lock_limit(%lu)\n", + locked, lock_limit); + return -ENOMEM; + } + mm->pinned_vm = locked; + 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, 0); + __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, 1)) { + __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; + down_write(&mm->mmap_sem); + if (ulimit) { + err = __scif_check_inc_pinned_vm(mm, nr_pages); + if (err) { + up_write(&mm->mmap_sem); + pinned_pages->nr_pages = 0; + goto error_unmap; + } + } + + pinned_pages->nr_pages = get_user_pages( + (u64)addr, + nr_pages, + (prot & SCIF_PROT_WRITE) ? FOLL_WRITE : 0, + pinned_pages->pages, + NULL); + up_write(&mm->mmap_sem); + 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, 0); + /* 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, 0); + /* 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); |