mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-09-30 22:26:55 +00:00
Code Issues Releases Wiki Activity

IB/hfi1: Use dma_mmap_coherent for matching buffers

Browse source 
For memory allocated with dma_alloc_coherent(), use
dma_mmap_coherent() to mmap it into user space.

Signed-off-by: Dean Luick <dean.luick@cornelisnetworks.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@cornelisnetworks.com>
Link: https://lore.kernel.org/r/167329107460.1472990.9090255834533222032.stgit@awfm-02.cornelisnetworks.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>
This commit is contained in:
Dean Luick 2023-01-09 14:04:34 -05:00 committed by Leon Romanovsky
parent 892ede5a77
commit 1ec82317a1
1 changed files with 57 additions and 24 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

81
drivers/infiniband/hw/hfi1/file_ops.c
View file

@ -306,6 +306,17 @@ static ssize_t hfi1_write_iter(struct kiocb *kiocb, struct iov_iter *from)
return reqs;
}
static inline void mmap_cdbg(u16 ctxt, u8 subctxt, u8 type, u8 mapio, u8 vmf,
u64 memaddr, void *memvirt, dma_addr_t memdma,
ssize_t memlen, struct vm_area_struct *vma)
{
hfi1_cdbg(PROC,
"%u:%u type:%u io/vf/dma:%d/%d/%d, addr:0x%llx, len:%lu(%lu), flags:0x%lx",
ctxt, subctxt, type, mapio, vmf, !!memdma,
memaddr ?: (u64)memvirt, memlen,
vma->vm_end - vma->vm_start, vma->vm_flags);
}
static int hfi1_file_mmap(struct file *fp, struct vm_area_struct *vma)
{
struct hfi1_filedata *fd = fp->private_data;
@ -315,6 +326,7 @@ static int hfi1_file_mmap(struct file *fp, struct vm_area_struct *vma)
u64 token = vma->vm_pgoff << PAGE_SHIFT,
memaddr = 0;
void *memvirt = NULL;
dma_addr_t memdma = 0;
u8 subctxt, mapio = 0, vmf = 0, type;
ssize_t memlen = 0;
int ret = 0;
@ -334,6 +346,11 @@ static int hfi1_file_mmap(struct file *fp, struct vm_area_struct *vma)
goto done;
}
/*
* vm_pgoff is used as a buffer selector cookie. Always mmap from
* the beginning.
*/
vma->vm_pgoff = 0;
flags = vma->vm_flags;
switch (type) {
@ -355,7 +372,8 @@ static int hfi1_file_mmap(struct file *fp, struct vm_area_struct *vma)
vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
mapio = 1;
break;
case PIO_CRED:
case PIO_CRED: {
u64 cr_page_offset;
if (flags & VM_WRITE) {
ret = -EPERM;
goto done;
@ -365,10 +383,11 @@ static int hfi1_file_mmap(struct file *fp, struct vm_area_struct *vma)
* second or third page allocated for credit returns (if number
* of enabled contexts > 64 and 128 respectively).
*/
memvirt = dd->cr_base[uctxt->numa_id].va;
memaddr = virt_to_phys(memvirt) +
(((u64)uctxt->sc->hw_free -
(u64)dd->cr_base[uctxt->numa_id].va) & PAGE_MASK);
cr_page_offset = ((u64)uctxt->sc->hw_free -
(u64)dd->cr_base[uctxt->numa_id].va) &
PAGE_MASK;
memvirt = dd->cr_base[uctxt->numa_id].va + cr_page_offset;
memdma = dd->cr_base[uctxt->numa_id].dma + cr_page_offset;
memlen = PAGE_SIZE;
flags &= ~VM_MAYWRITE;
flags |= VM_DONTCOPY | VM_DONTEXPAND;
@ -378,14 +397,16 @@ static int hfi1_file_mmap(struct file *fp, struct vm_area_struct *vma)
* memory been flagged as non-cached?
*/
/* vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot); */
mapio = 1;
break;
}
case RCV_HDRQ:
memlen = rcvhdrq_size(uctxt);
memvirt = uctxt->rcvhdrq;
memdma = uctxt->rcvhdrq_dma;
break;
case RCV_EGRBUF: {
unsigned long addr;
unsigned long vm_start_save;
unsigned long vm_end_save;
int i;
/*
* The RcvEgr buffer need to be handled differently
@ -404,24 +425,34 @@ static int hfi1_file_mmap(struct file *fp, struct vm_area_struct *vma)
goto done;
}
vma->vm_flags &= ~VM_MAYWRITE;
addr = vma->vm_start;
/*
* Mmap multiple separate allocations into a single vma. From
* here, dma_mmap_coherent() calls dma_direct_mmap(), which
* requires the mmap to exactly fill the vma starting at
* vma_start. Adjust the vma start and end for each eager
* buffer segment mapped. Restore the originals when done.
*/
vm_start_save = vma->vm_start;
vm_end_save = vma->vm_end;
vma->vm_end = vma->vm_start;
for (i = 0 ; i < uctxt->egrbufs.numbufs; i++) {
memlen = uctxt->egrbufs.buffers[i].len;
memvirt = uctxt->egrbufs.buffers[i].addr;
ret = remap_pfn_range(
vma, addr,
/*
* virt_to_pfn() does the same, but
* it's not available on x86_64
* when CONFIG_MMU is enabled.
*/
PFN_DOWN(__pa(memvirt)),
memlen,
vma->vm_page_prot);
if (ret < 0)
memdma = uctxt->egrbufs.buffers[i].dma;
vma->vm_end += memlen;
mmap_cdbg(ctxt, subctxt, type, mapio, vmf, memaddr,
memvirt, memdma, memlen, vma);
ret = dma_mmap_coherent(&dd->pcidev->dev, vma,
memvirt, memdma, memlen);
if (ret < 0) {
vma->vm_start = vm_start_save;
vma->vm_end = vm_end_save;
goto done;
addr += memlen;
}
vma->vm_start += memlen;
}
vma->vm_start = vm_start_save;
vma->vm_end = vm_end_save;
ret = 0;
goto done;
}
@ -481,6 +512,7 @@ static int hfi1_file_mmap(struct file *fp, struct vm_area_struct *vma)
}
memlen = PAGE_SIZE;
memvirt = (void *)hfi1_rcvhdrtail_kvaddr(uctxt);
memdma = uctxt->rcvhdrqtailaddr_dma;
flags &= ~VM_MAYWRITE;
break;
case SUBCTXT_UREGS:
@ -529,14 +561,15 @@ static int hfi1_file_mmap(struct file *fp, struct vm_area_struct *vma)
}
vma->vm_flags = flags;
hfi1_cdbg(PROC,
"%u:%u type:%u io/vf:%d/%d, addr:0x%llx, len:%lu(%lu), flags:0x%lx\n",
ctxt, subctxt, type, mapio, vmf, memaddr, memlen,
vma->vm_end - vma->vm_start, vma->vm_flags);
mmap_cdbg(ctxt, subctxt, type, mapio, vmf, memaddr, memvirt, memdma,
memlen, vma);
if (vmf) {
vma->vm_pgoff = PFN_DOWN(memaddr);
vma->vm_ops = &vm_ops;
ret = 0;
} else if (memdma) {
ret = dma_mmap_coherent(&dd->pcidev->dev, vma,
memvirt, memdma, memlen);
} else if (mapio) {
ret = io_remap_pfn_range(vma, vma->vm_start,
PFN_DOWN(memaddr),