When IOMMU support was enabled, dma-buf import in Exynos DRM was broken
since commit f43c35966a5a ("drm/exynos: use real device for DMA-mapping
operations") due to using wrong struct device in drm_gem_prime_import()
function. This patch fixes following kernel BUG caused by incorrect buffer
mapping to DMA address space:
exynos-sysmmu 14650000.sysmmu: 14450000.mixer: PAGE FAULT occurred at 0xb2e00000
------------[ cut here ]------------
kernel BUG at drivers/iommu/exynos-iommu.c:449!
Internal error: Oops - BUG: 0 [#1] PREEMPT SMP ARM
Modules linked in:
CPU: 0 PID: 0 Comm: swapper/0 Not tainted 4.14.0-rc4-next-20171016-00033-g990d723669fd #3165
Hardware name: SAMSUNG EXYNOS (Flattened Device Tree)
task: c0e0b7c0 task.stack: c0e00000
PC is at exynos_sysmmu_irq+0x1d0/0x24c
LR is at exynos_sysmmu_irq+0x154/0x24c
------------[ cut here ]------------
Reported-by: Marian Mihailescu <mihailescu2m@xxxxxxxxx>
Fixes: f43c35966a5a ("drm/exynos: use real device for DMA-mapping operations")
Signed-off-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx>
---
drivers/gpu/drm/exynos/exynos_drm_drv.c | 2 +-
drivers/gpu/drm/exynos/exynos_drm_gem.c | 6 ++++++
drivers/gpu/drm/exynos/exynos_drm_gem.h | 2 ++
3 files changed, 9 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/exynos/exynos_drm_drv.c b/drivers/gpu/drm/exynos/exynos_drm_drv.c
index e651a58c18cf..0822c5341ba4 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_drv.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_drv.c
@@ -148,7 +148,7 @@ static struct drm_driver exynos_drm_driver = {
.prime_handle_to_fd = drm_gem_prime_handle_to_fd,
.prime_fd_to_handle = drm_gem_prime_fd_to_handle,
.gem_prime_export = drm_gem_prime_export,
- .gem_prime_import = drm_gem_prime_import,
+ .gem_prime_import = exynos_drm_gem_prime_import,
.gem_prime_get_sg_table = exynos_drm_gem_prime_get_sg_table,
.gem_prime_import_sg_table = exynos_drm_gem_prime_import_sg_table,
.gem_prime_vmap = exynos_drm_gem_prime_vmap,
diff --git a/drivers/gpu/drm/exynos/exynos_drm_gem.c b/drivers/gpu/drm/exynos/exynos_drm_gem.c
index 077de014d610..ef35bc23bb36 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_gem.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_gem.c
@@ -506,6 +506,12 @@ int exynos_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
}
/* low-level interface prime helpers */
+struct drm_gem_object *exynos_drm_gem_prime_import(struct drm_device *dev,
+ struct dma_buf *dma_buf)
+{
+ return drm_gem_prime_import_dev(dev, dma_buf, to_dma_dev(dev));
+}
+
struct sg_table *exynos_drm_gem_prime_get_sg_table(struct drm_gem_object *obj)
{
struct exynos_drm_gem *exynos_gem = to_exynos_gem(obj);
diff --git a/drivers/gpu/drm/exynos/exynos_drm_gem.h b/drivers/gpu/drm/exynos/exynos_drm_gem.h
index e86d1a9518c3..5a4c7de80f65 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_gem.h
+++ b/drivers/gpu/drm/exynos/exynos_drm_gem.h
@@ -117,6 +117,8 @@ int exynos_drm_gem_fault(struct vm_fault *vmf);
int exynos_drm_gem_mmap(struct file *filp, struct vm_area_struct *vma);
/* low-level interface prime helpers */
+struct drm_gem_object *exynos_drm_gem_prime_import(struct drm_device *dev,
+ struct dma_buf *dma_buf);
struct sg_table *exynos_drm_gem_prime_get_sg_table(struct drm_gem_object *obj);
struct drm_gem_object *
exynos_drm_gem_prime_import_sg_table(struct drm_device *dev,
--
2.14.2
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