[PATCH 5.9 143/252] dmaengine: idxd: fix mapping of portal size

Greg Kroah-Hartman
2020-11-23T12:57:07Z

From: Dave Jiang <dave.jiang@intel.com>

[ Upstream commit 8326be9f1c0bb498baf134878a8deb8a952e0135 ]

Portal size is 4k. Current code is mapping all 4 portals in a single chunk.
Restrict the mapped portal size to a single portal to ensure that submission
only goes to the intended portal address.

Fixes: c52ca478233c ("dmaengine: idxd: add configuration component of driver")
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Link: https://lore.kernel.org/r/160513342642.510187.16450549281618747065.stgit@djiang5-desk3.ch.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/dma/idxd/device.c | 2 +-
drivers/dma/idxd/registers.h | 2 +-
drivers/dma/idxd/submit.c | 2 +-
3 files changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/dma/idxd/device.c b/drivers/dma/idxd/device.c
index c2beece445215..66e947627f569 100644
--- a/drivers/dma/idxd/device.c
+++ b/drivers/dma/idxd/device.c
@@ -271,7 +271,7 @@ int idxd_wq_map_portal(struct idxd_wq *wq)
resource_size_t start;

start = pci_resource_start(pdev, IDXD_WQ_BAR);
- start = start + wq->id * IDXD_PORTAL_SIZE;
+ start += idxd_get_wq_portal_full_offset(wq->id, IDXD_PORTAL_LIMITED);

wq->dportal = devm_ioremap(dev, start, IDXD_PORTAL_SIZE);
if (!wq->dportal)
diff --git a/drivers/dma/idxd/registers.h b/drivers/dma/idxd/registers.h
index aef5a902829ee..54390334c243a 100644
--- a/drivers/dma/idxd/registers.h
+++ b/drivers/dma/idxd/registers.h
@@ -8,7 +8,7 @@

#define IDXD_MMIO_BAR 0
#define IDXD_WQ_BAR 2
-#define IDXD_PORTAL_SIZE 0x4000
+#define IDXD_PORTAL_SIZE PAGE_SIZE

/* MMIO Device BAR0 Registers */
#define IDXD_VER_OFFSET 0x00
diff --git a/drivers/dma/idxd/submit.c b/drivers/dma/idxd/submit.c
index 156a1ee233aa5..417048e3c42aa 100644
--- a/drivers/dma/idxd/submit.c
+++ b/drivers/dma/idxd/submit.c
@@ -74,7 +74,7 @@ int idxd_submit_desc(struct idxd_wq *wq, struct idxd_desc *desc)
if (idxd->state != IDXD_DEV_ENABLED)
return -EIO;

- portal = wq->dportal + idxd_get_wq_portal_offset(IDXD_PORTAL_UNLIMITED);
+ portal = wq->dportal;
/*
* The wmb() flushes writes to coherent DMA data before possibly
* triggering a DMA read. The wmb() is necessary even on UP because
--
2.27.0