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linux/drivers/misc/mic/scif/scif_rma.c

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/*
* 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_dma_phys ?
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 (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;
pinned_pages->nr_pages = nr_pages;
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:
pinned_pages->nr_pages = nr_pages;
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);
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