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Subject[PATCH 4.14 069/157] IB/hfi1: Fix user context tail allocation for DMA_RTAIL
Date
4.14-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Mike Marciniszyn <mike.marciniszyn@intel.com>

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.

Cc: <stable@vger.kernel.org> # 4.9.x
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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
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(-)

--- a/drivers/infiniband/hw/hfi1/chip.c
+++ b/drivers/infiniband/hw/hfi1/chip.c
@@ -6829,7 +6829,7 @@ static void rxe_kernel_unfreeze(struct h
}
rcvmask = HFI1_RCVCTRL_CTXT_ENB;
/* HFI1_RCVCTRL_TAILUPD_[ENB|DIS] needs to be set explicitly */
- rcvmask |= HFI1_CAP_KGET_MASK(rcd->flags, DMA_RTAIL) ?
+ rcvmask |= rcd->rcvhdrtail_kvaddr ?
HFI1_RCVCTRL_TAILUPD_ENB : HFI1_RCVCTRL_TAILUPD_DIS;
hfi1_rcvctrl(dd, rcvmask, rcd);
hfi1_rcd_put(rcd);
@@ -8341,7 +8341,7 @@ static inline int check_packet_present(s
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 */
@@ -11813,7 +11813,7 @@ void hfi1_rcvctrl(struct hfi1_devdata *d
/* 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;
@@ -11893,7 +11893,7 @@ void hfi1_rcvctrl(struct hfi1_devdata *d
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 */
--- a/drivers/infiniband/hw/hfi1/file_ops.c
+++ b/drivers/infiniband/hw/hfi1/file_ops.c
@@ -622,7 +622,7 @@ static int hfi1_file_mmap(struct file *f
ret = -EINVAL;
goto done;
}
- if (flags & VM_WRITE) {
+ if ((flags & VM_WRITE) || !uctxt->rcvhdrtail_kvaddr) {
ret = -EPERM;
goto done;
}
--- a/drivers/infiniband/hw/hfi1/init.c
+++ b/drivers/infiniband/hw/hfi1/init.c
@@ -1808,7 +1808,6 @@ int hfi1_create_rcvhdrq(struct hfi1_devd
u64 reg;

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

/*
@@ -1834,13 +1833,13 @@ int hfi1_create_rcvhdrq(struct hfi1_devd
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;

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