From: Stanislaw Gruszka <stanislaw.gruszka@xxxxxxxxxxxxxxx>
[ Upstream commit b563e47957af4ff71736c5cc4120a59b055ab583 ]
If we get signal when waiting for the mmu->lock we do not invalidate
current MMU configuration that might result in undefined behavior.
Additionally there is little or no benefit on break waiting for
ipc->lock. In current code base, we keep this lock for short periods.
Fixes: 263b2ba5fc93 ("accel/ivpu: Add Intel VPU MMU support")
Reviewed-by: Krystian Pradzynski <krystian.pradzynski@xxxxxxxxxxxxxxx>
Reviewed-by: Jeffrey Hugo <quic_jhugo@xxxxxxxxxxx>
Signed-off-by: Stanislaw Gruszka <stanislaw.gruszka@xxxxxxxxxxxxxxx>
Link: https://patchwork.freedesktop.org/patch/msgid/20230525103818.877590-2-stanislaw.gruszka@xxxxxxxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/accel/ivpu/ivpu_ipc.c | 4 +---
drivers/accel/ivpu/ivpu_mmu.c | 22 ++++++----------------
2 files changed, 7 insertions(+), 19 deletions(-)
diff --git a/drivers/accel/ivpu/ivpu_ipc.c b/drivers/accel/ivpu/ivpu_ipc.c
index 3adcfa80fc0e5..fa0af59e39ab6 100644
--- a/drivers/accel/ivpu/ivpu_ipc.c
+++ b/drivers/accel/ivpu/ivpu_ipc.c
@@ -183,9 +183,7 @@ ivpu_ipc_send(struct ivpu_device *vdev, struct ivpu_ipc_consumer *cons, struct v
struct ivpu_ipc_info *ipc = vdev->ipc;
int ret;
- ret = mutex_lock_interruptible(&ipc->lock);
- if (ret)
- return ret;
+ mutex_lock(&ipc->lock);
if (!ipc->on) {
ret = -EAGAIN;
diff --git a/drivers/accel/ivpu/ivpu_mmu.c b/drivers/accel/ivpu/ivpu_mmu.c
index 694e978aba663..b8b259b3aa635 100644
--- a/drivers/accel/ivpu/ivpu_mmu.c
+++ b/drivers/accel/ivpu/ivpu_mmu.c
@@ -587,16 +587,11 @@ static int ivpu_mmu_strtab_init(struct ivpu_device *vdev)
int ivpu_mmu_invalidate_tlb(struct ivpu_device *vdev, u16 ssid)
{
struct ivpu_mmu_info *mmu = vdev->mmu;
- int ret;
-
- ret = mutex_lock_interruptible(&mmu->lock);
- if (ret)
- return ret;
+ int ret = 0;
- if (!mmu->on) {
- ret = 0;
+ mutex_lock(&mmu->lock);
+ if (!mmu->on)
goto unlock;
- }
ret = ivpu_mmu_cmdq_write_tlbi_nh_asid(vdev, ssid);
if (ret)
@@ -614,7 +609,7 @@ static int ivpu_mmu_cd_add(struct ivpu_device *vdev, u32 ssid, u64 cd_dma)
struct ivpu_mmu_cdtab *cdtab = &mmu->cdtab;
u64 *entry;
u64 cd[4];
- int ret;
+ int ret = 0;
if (ssid > IVPU_MMU_CDTAB_ENT_COUNT)
return -EINVAL;
@@ -655,14 +650,9 @@ static int ivpu_mmu_cd_add(struct ivpu_device *vdev, u32 ssid, u64 cd_dma)
ivpu_dbg(vdev, MMU, "CDTAB %s entry (SSID=%u, dma=%pad): 0x%llx, 0x%llx, 0x%llx, 0x%llx\n",
cd_dma ? "write" : "clear", ssid, &cd_dma, cd[0], cd[1], cd[2], cd[3]);
- ret = mutex_lock_interruptible(&mmu->lock);
- if (ret)
- return ret;
-
- if (!mmu->on) {
- ret = 0;
+ mutex_lock(&mmu->lock);
+ if (!mmu->on)
goto unlock;
- }
ret = ivpu_mmu_cmdq_write_cfgi_all(vdev);
if (ret)
--
2.39.2
