You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
79 lines
2.2 KiB
79 lines
2.2 KiB
From b280acf3c32746106c81419390f5b1869d644f66 Mon Sep 17 00:00:00 2001
|
|
From: Eric Anholt <eric@anholt.net>
|
|
Date: Mon, 12 Oct 2015 08:58:08 -0700
|
|
Subject: [PATCH] drm/vc4: Verify at boot that CMA doesn't cross a 256MB
|
|
boundary.
|
|
|
|
I've seen lots of users cranking CMA up higher, so throw an error if
|
|
they do.
|
|
|
|
Signed-off-by: Eric Anholt <eric@anholt.net>
|
|
---
|
|
drivers/base/dma-contiguous.c | 1 +
|
|
drivers/gpu/drm/vc4/vc4_v3d.c | 18 ++++++++++++++++++
|
|
mm/cma.c | 2 ++
|
|
3 files changed, 21 insertions(+)
|
|
|
|
--- a/drivers/base/dma-contiguous.c
|
|
+++ b/drivers/base/dma-contiguous.c
|
|
@@ -35,6 +35,7 @@
|
|
#endif
|
|
|
|
struct cma *dma_contiguous_default_area;
|
|
+EXPORT_SYMBOL(dma_contiguous_default_area);
|
|
|
|
/*
|
|
* Default global CMA area size can be defined in kernel's .config.
|
|
--- a/drivers/gpu/drm/vc4/vc4_v3d.c
|
|
+++ b/drivers/gpu/drm/vc4/vc4_v3d.c
|
|
@@ -16,7 +16,10 @@
|
|
* this program. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
+#include "linux/init.h"
|
|
+#include "linux/cma.h"
|
|
#include "linux/component.h"
|
|
+#include "linux/dma-contiguous.h"
|
|
#include "linux/pm_runtime.h"
|
|
#include "vc4_drv.h"
|
|
#include "vc4_regs.h"
|
|
@@ -185,8 +188,23 @@ static int vc4_v3d_bind(struct device *d
|
|
struct drm_device *drm = dev_get_drvdata(master);
|
|
struct vc4_dev *vc4 = to_vc4_dev(drm);
|
|
struct vc4_v3d *v3d = NULL;
|
|
+ struct cma *cma;
|
|
int ret;
|
|
|
|
+ cma = dev_get_cma_area(dev);
|
|
+ if (!cma)
|
|
+ return -EINVAL;
|
|
+
|
|
+ if ((cma_get_base(cma) & 0xf0000000) !=
|
|
+ ((cma_get_base(cma) + cma_get_size(cma) - 1) & 0xf0000000)) {
|
|
+ DRM_ERROR("V3D requires that the CMA area (0x%08lx - 0x%08lx) "
|
|
+ "not span a 256MB boundary, or memory corruption "
|
|
+ "would happen.\n",
|
|
+ (long)cma_get_base(cma),
|
|
+ cma_get_base(cma) + cma_get_size(cma));
|
|
+ return -EINVAL;
|
|
+ }
|
|
+
|
|
v3d = devm_kzalloc(&pdev->dev, sizeof(*v3d), GFP_KERNEL);
|
|
if (!v3d)
|
|
return -ENOMEM;
|
|
--- a/mm/cma.c
|
|
+++ b/mm/cma.c
|
|
@@ -47,11 +47,13 @@ phys_addr_t cma_get_base(const struct cm
|
|
{
|
|
return PFN_PHYS(cma->base_pfn);
|
|
}
|
|
+EXPORT_SYMBOL(cma_get_base);
|
|
|
|
unsigned long cma_get_size(const struct cma *cma)
|
|
{
|
|
return cma->count << PAGE_SHIFT;
|
|
}
|
|
+EXPORT_SYMBOL(cma_get_size);
|
|
|
|
static unsigned long cma_bitmap_aligned_mask(const struct cma *cma,
|
|
int align_order)
|
|
|