commit 1bc0299d976e000ececc6acd76e33b4582646cb7 upstream.

The following code fails to allocate a buffer for the tail address that the hardware DMAs into when the user context DMA_RTAIL is set.

if (HFI1_CAP_KGET_MASK(rcd->flags, DMA_RTAIL)) { rcd->rcvhdrtail_kvaddr = dma_zalloc_coherent( &dd->pcidev->dev, PAGE_SIZE, &dma_hdrqtail, gfp_flags); if (!rcd->rcvhdrtail_kvaddr) goto bail_free; rcd->rcvhdrqtailaddr_dma = dma_hdrqtail; }

So the rcvhdrtail_kvaddr would then be NULL.

The mmap logic fails to check for a NULL rcvhdrtail_kvaddr.

The fix is to test for both user and kernel DMA_TAIL options during the allocation as well as testing for a NULL rcvhdrtail_kvaddr during the mmap processing.

Additionally, all downstream testing of the capmask for DMA_RTAIL have been eliminated in favor of testing rcvhdrtail_kvaddr.

The patch had to be adjusted for lack of VNIC and interating contexts differently in the 4.9 code base.

Reviewed-by: Michael J. Ruhl michael.j.ruhl@intel.com Signed-off-by: Mike Marciniszyn mike.marciniszyn@intel.com Signed-off-by: Dennis Dalessandro dennis.dalessandro@intel.com Signed-off-by: Jason Gunthorpe jgg@mellanox.com --- drivers/infiniband/hw/hfi1/chip.c | 8 ++++---- drivers/infiniband/hw/hfi1/file_ops.c | 2 +- drivers/infiniband/hw/hfi1/init.c | 9 ++++----- 3 files changed, 9 insertions(+), 10 deletions(-)

diff --git a/drivers/infiniband/hw/hfi1/chip.c b/drivers/infiniband/hw/hfi1/chip.c index 148b313..d30b3b9 100644 --- a/drivers/infiniband/hw/hfi1/chip.c +++ b/drivers/infiniband/hw/hfi1/chip.c @@ -6717,7 +6717,7 @@ static void rxe_kernel_unfreeze(struct hfi1_devdata *dd) for (i = 0; i < dd->n_krcv_queues; i++) { rcvmask = HFI1_RCVCTRL_CTXT_ENB; /* HFI1_RCVCTRL_TAILUPD_[ENB|DIS] needs to be set explicitly */ - rcvmask |= HFI1_CAP_KGET_MASK(dd->rcd[i]->flags, DMA_RTAIL) ? + rcvmask |= dd->rcd[i]->rcvhdrtail_kvaddr ? HFI1_RCVCTRL_TAILUPD_ENB : HFI1_RCVCTRL_TAILUPD_DIS; hfi1_rcvctrl(dd, rcvmask, i); } @@ -8211,7 +8211,7 @@ static inline int check_packet_present(struct hfi1_ctxtdata *rcd) u32 tail; int present;

- if (!HFI1_CAP_IS_KSET(DMA_RTAIL)) + if (!rcd->rcvhdrtail_kvaddr) present = (rcd->seq_cnt == rhf_rcv_seq(rhf_to_cpu(get_rhf_addr(rcd)))); else /* is RDMA rtail */ @@ -11550,7 +11550,7 @@ void hfi1_rcvctrl(struct hfi1_devdata *dd, unsigned int op, int ctxt) /* reset the tail and hdr addresses, and sequence count */ write_kctxt_csr(dd, ctxt, RCV_HDR_ADDR, rcd->rcvhdrq_dma); - if (HFI1_CAP_KGET_MASK(rcd->flags, DMA_RTAIL)) + if (rcd->rcvhdrtail_kvaddr) write_kctxt_csr(dd, ctxt, RCV_HDR_TAIL_ADDR, rcd->rcvhdrqtailaddr_dma); rcd->seq_cnt = 1; @@ -11630,7 +11630,7 @@ void hfi1_rcvctrl(struct hfi1_devdata *dd, unsigned int op, int ctxt) rcvctrl |= RCV_CTXT_CTRL_INTR_AVAIL_SMASK; if (op & HFI1_RCVCTRL_INTRAVAIL_DIS) rcvctrl &= ~RCV_CTXT_CTRL_INTR_AVAIL_SMASK; - if (op & HFI1_RCVCTRL_TAILUPD_ENB && rcd->rcvhdrqtailaddr_dma) + if ((op & HFI1_RCVCTRL_TAILUPD_ENB) && rcd->rcvhdrtail_kvaddr) rcvctrl |= RCV_CTXT_CTRL_TAIL_UPD_SMASK; if (op & HFI1_RCVCTRL_TAILUPD_DIS) { /* See comment on RcvCtxtCtrl.TailUpd above */ diff --git a/drivers/infiniband/hw/hfi1/file_ops.c b/drivers/infiniband/hw/hfi1/file_ops.c index bb72976..d612f9d 100644 --- a/drivers/infiniband/hw/hfi1/file_ops.c +++ b/drivers/infiniband/hw/hfi1/file_ops.c @@ -609,7 +609,7 @@ static int hfi1_file_mmap(struct file *fp, struct vm_area_struct *vma) ret = -EINVAL; goto done; } - if (flags & VM_WRITE) { + if ((flags & VM_WRITE) || !uctxt->rcvhdrtail_kvaddr) { ret = -EPERM; goto done; } diff --git a/drivers/infiniband/hw/hfi1/init.c b/drivers/infiniband/hw/hfi1/init.c index ae1f90d..28f4079 100644 --- a/drivers/infiniband/hw/hfi1/init.c +++ b/drivers/infiniband/hw/hfi1/init.c @@ -1605,7 +1605,6 @@ int hfi1_create_rcvhdrq(struct hfi1_devdata *dd, struct hfi1_ctxtdata *rcd) u64 reg;

if (!rcd->rcvhdrq) { - dma_addr_t dma_hdrqtail; gfp_t gfp_flags;

/* @@ -1628,13 +1627,13 @@ int hfi1_create_rcvhdrq(struct hfi1_devdata *dd, struct hfi1_ctxtdata *rcd) goto bail; }

- if (HFI1_CAP_KGET_MASK(rcd->flags, DMA_RTAIL)) { + if (HFI1_CAP_KGET_MASK(rcd->flags, DMA_RTAIL) || + HFI1_CAP_UGET_MASK(rcd->flags, DMA_RTAIL)) { rcd->rcvhdrtail_kvaddr = dma_zalloc_coherent( - &dd->pcidev->dev, PAGE_SIZE, &dma_hdrqtail, - gfp_flags); + &dd->pcidev->dev, PAGE_SIZE, + &rcd->rcvhdrqtailaddr_dma, gfp_flags); if (!rcd->rcvhdrtail_kvaddr) goto bail_free; - rcd->rcvhdrqtailaddr_dma = dma_hdrqtail; }

rcd->rcvhdrq_size = amt;