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path: root/drivers/infiniband/hw/usnic/usnic_uiom.c
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Diffstat (limited to 'drivers/infiniband/hw/usnic/usnic_uiom.c')
-rw-r--r--drivers/infiniband/hw/usnic/usnic_uiom.c116
1 files changed, 26 insertions, 90 deletions
diff --git a/drivers/infiniband/hw/usnic/usnic_uiom.c b/drivers/infiniband/hw/usnic/usnic_uiom.c
index 49275a548751..3fbf99757b11 100644
--- a/drivers/infiniband/hw/usnic/usnic_uiom.c
+++ b/drivers/infiniband/hw/usnic/usnic_uiom.c
@@ -40,15 +40,12 @@
#include <linux/iommu.h>
#include <linux/workqueue.h>
#include <linux/list.h>
-#include <linux/pci.h>
#include <rdma/ib_verbs.h>
#include "usnic_log.h"
#include "usnic_uiom.h"
#include "usnic_uiom_interval_tree.h"
-static struct workqueue_struct *usnic_uiom_wq;
-
#define USNIC_UIOM_PAGE_CHUNK \
((PAGE_SIZE - offsetof(struct usnic_uiom_chunk, page_list)) /\
((void *) &((struct usnic_uiom_chunk *) 0)->page_list[1] - \
@@ -59,7 +56,7 @@ static int usnic_uiom_dma_fault(struct iommu_domain *domain,
unsigned long iova, int flags,
void *token)
{
- usnic_err("Device %s iommu fault domain 0x%pK va 0x%lx flags 0x%x\n",
+ usnic_err("Device %s iommu fault domain 0x%p va 0x%lx flags 0x%x\n",
dev_name(dev),
domain, iova, flags);
return -ENOSYS;
@@ -77,9 +74,7 @@ static void usnic_uiom_put_pages(struct list_head *chunk_list, int dirty)
for_each_sg(chunk->page_list, sg, chunk->nents, i) {
page = sg_page(sg);
pa = sg_phys(sg);
- if (!PageDirty(page) && dirty)
- set_page_dirty_lock(page);
- put_page(page);
+ unpin_user_pages_dirty_lock(&page, 1, dirty);
usnic_dbg("pa: %pa\n", &pa);
}
kfree(chunk);
@@ -90,6 +85,7 @@ static int usnic_uiom_get_pages(unsigned long addr, size_t size, int writable,
int dmasync, struct usnic_uiom_reg *uiomr)
{
struct list_head *chunk_list = &uiomr->chunk_list;
+ unsigned int gup_flags = FOLL_LONGTERM;
struct page **page_list;
struct scatterlist *sg;
struct usnic_uiom_chunk *chunk;
@@ -100,9 +96,7 @@ static int usnic_uiom_get_pages(unsigned long addr, size_t size, int writable,
int ret;
int off;
int i;
- int flags;
dma_addr_t pa;
- unsigned int gup_flags;
struct mm_struct *mm;
/*
@@ -127,9 +121,9 @@ static int usnic_uiom_get_pages(unsigned long addr, size_t size, int writable,
npages = PAGE_ALIGN(size + (addr & ~PAGE_MASK)) >> PAGE_SHIFT;
uiomr->owning_mm = mm = current->mm;
- down_write(&mm->mmap_sem);
+ mmap_read_lock(mm);
- locked = npages + current->mm->pinned_vm;
+ locked = atomic64_add_return(npages, &current->mm->pinned_vm);
lock_limit = rlimit(RLIMIT_MEMLOCK) >> PAGE_SHIFT;
if ((locked > lock_limit) && !capable(CAP_IPC_LOCK)) {
@@ -137,18 +131,16 @@ static int usnic_uiom_get_pages(unsigned long addr, size_t size, int writable,
goto out;
}
- flags = IOMMU_READ | IOMMU_CACHE;
- flags |= (writable) ? IOMMU_WRITE : 0;
- gup_flags = FOLL_WRITE;
- gup_flags |= (writable) ? 0 : FOLL_FORCE;
+ if (writable)
+ gup_flags |= FOLL_WRITE;
cur_base = addr & PAGE_MASK;
ret = 0;
while (npages) {
- ret = get_user_pages_longterm(cur_base,
- min_t(unsigned long, npages,
- PAGE_SIZE / sizeof(struct page *)),
- gup_flags, page_list, NULL);
+ ret = pin_user_pages(cur_base,
+ min_t(unsigned long, npages,
+ PAGE_SIZE / sizeof(struct page *)),
+ gup_flags, page_list);
if (ret < 0)
goto out;
@@ -157,9 +149,8 @@ static int usnic_uiom_get_pages(unsigned long addr, size_t size, int writable,
off = 0;
while (ret) {
- chunk = kmalloc(sizeof(*chunk) +
- sizeof(struct scatterlist) *
- min_t(int, ret, USNIC_UIOM_PAGE_CHUNK),
+ chunk = kmalloc(struct_size(chunk, page_list,
+ min_t(int, ret, USNIC_UIOM_PAGE_CHUNK)),
GFP_KERNEL);
if (!chunk) {
ret = -ENOMEM;
@@ -185,14 +176,13 @@ static int usnic_uiom_get_pages(unsigned long addr, size_t size, int writable,
}
out:
- if (ret < 0)
+ if (ret < 0) {
usnic_uiom_put_pages(chunk_list, 0);
- else {
- mm->pinned_vm = locked;
+ atomic64_sub(npages, &current->mm->pinned_vm);
+ } else
mmgrab(uiomr->owning_mm);
- }
- up_write(&mm->mmap_sem);
+ mmap_read_unlock(mm);
free_page((unsigned long) page_list);
return ret;
}
@@ -287,7 +277,7 @@ iter_chunk:
usnic_dbg("va 0x%lx pa %pa size 0x%zx flags 0x%x",
va_start, &pa_start, size, flags);
err = iommu_map(pd->domain, va_start, pa_start,
- size, flags);
+ size, flags, GFP_ATOMIC);
if (err) {
usnic_err("Failed to map va 0x%lx pa %pa size 0x%zx with err %d\n",
va_start, &pa_start, size, err);
@@ -304,7 +294,7 @@ iter_chunk:
usnic_dbg("va 0x%lx pa %pa size 0x%zx flags 0x%x\n",
va_start, &pa_start, size, flags);
err = iommu_map(pd->domain, va_start, pa_start,
- size, flags);
+ size, flags, GFP_ATOMIC);
if (err) {
usnic_err("Failed to map va 0x%lx pa %pa size 0x%zx with err %d\n",
va_start, &pa_start, size, err);
@@ -436,47 +426,15 @@ static inline size_t usnic_uiom_num_pages(struct usnic_uiom_reg *uiomr)
return PAGE_ALIGN(uiomr->length + uiomr->offset) >> PAGE_SHIFT;
}
-static void usnic_uiom_release_defer(struct work_struct *work)
-{
- struct usnic_uiom_reg *uiomr =
- container_of(work, struct usnic_uiom_reg, work);
-
- down_write(&uiomr->owning_mm->mmap_sem);
- uiomr->owning_mm->pinned_vm -= usnic_uiom_num_pages(uiomr);
- up_write(&uiomr->owning_mm->mmap_sem);
-
- __usnic_uiom_release_tail(uiomr);
-}
-
-void usnic_uiom_reg_release(struct usnic_uiom_reg *uiomr,
- struct ib_ucontext *context)
+void usnic_uiom_reg_release(struct usnic_uiom_reg *uiomr)
{
__usnic_uiom_reg_release(uiomr->pd, uiomr, 1);
- /*
- * We may be called with the mm's mmap_sem already held. This
- * can happen when a userspace munmap() is the call that drops
- * the last reference to our file and calls our release
- * method. If there are memory regions to destroy, we'll end
- * up here and not be able to take the mmap_sem. In that case
- * we defer the vm_locked accounting to a workqueue.
- */
- if (context->closing) {
- if (!down_write_trylock(&uiomr->owning_mm->mmap_sem)) {
- INIT_WORK(&uiomr->work, usnic_uiom_release_defer);
- queue_work(usnic_uiom_wq, &uiomr->work);
- return;
- }
- } else {
- down_write(&uiomr->owning_mm->mmap_sem);
- }
- uiomr->owning_mm->pinned_vm -= usnic_uiom_num_pages(uiomr);
- up_write(&uiomr->owning_mm->mmap_sem);
-
+ atomic64_sub(usnic_uiom_num_pages(uiomr), &uiomr->owning_mm->pinned_vm);
__usnic_uiom_release_tail(uiomr);
}
-struct usnic_uiom_pd *usnic_uiom_alloc_pd(void)
+struct usnic_uiom_pd *usnic_uiom_alloc_pd(struct device *dev)
{
struct usnic_uiom_pd *pd;
void *domain;
@@ -485,11 +443,11 @@ struct usnic_uiom_pd *usnic_uiom_alloc_pd(void)
if (!pd)
return ERR_PTR(-ENOMEM);
- pd->domain = domain = iommu_domain_alloc(&pci_bus_type);
- if (!domain) {
+ pd->domain = domain = iommu_paging_domain_alloc(dev);
+ if (IS_ERR(domain)) {
usnic_err("Failed to allocate IOMMU domain");
kfree(pd);
- return ERR_PTR(-ENOMEM);
+ return ERR_CAST(domain);
}
iommu_set_fault_handler(pd->domain, usnic_uiom_dma_fault, NULL);
@@ -520,7 +478,7 @@ int usnic_uiom_attach_dev_to_pd(struct usnic_uiom_pd *pd, struct device *dev)
if (err)
goto out_free_dev;
- if (!iommu_capable(dev->bus, IOMMU_CAP_CACHE_COHERENCY)) {
+ if (!device_iommu_capable(dev, IOMMU_CAP_CACHE_COHERENCY)) {
usnic_err("IOMMU of %s does not support cache coherency\n",
dev_name(dev));
err = -EINVAL;
@@ -593,25 +551,3 @@ void usnic_uiom_free_dev_list(struct device **devs)
{
kfree(devs);
}
-
-int usnic_uiom_init(char *drv_name)
-{
- if (!iommu_present(&pci_bus_type)) {
- usnic_err("IOMMU required but not present or enabled. USNIC QPs will not function w/o enabling IOMMU\n");
- return -EPERM;
- }
-
- usnic_uiom_wq = create_workqueue(drv_name);
- if (!usnic_uiom_wq) {
- usnic_err("Unable to alloc wq for drv %s\n", drv_name);
- return -ENOMEM;
- }
-
- return 0;
-}
-
-void usnic_uiom_fini(void)
-{
- flush_workqueue(usnic_uiom_wq);
- destroy_workqueue(usnic_uiom_wq);
-}
generated by cgit (git 2.34.1) at 2025-12-26 13:34:15 +0000