diff options
Diffstat (limited to 'target/linux/brcm2708/patches-4.4/0588-drm-vc4-Verify-at-boot-that-CMA-doesn-t-cross-a-256M.patch')
| -rw-r--r-- | target/linux/brcm2708/patches-4.4/0588-drm-vc4-Verify-at-boot-that-CMA-doesn-t-cross-a-256M.patch | 88 |
1 files changed, 88 insertions, 0 deletions
diff --git a/target/linux/brcm2708/patches-4.4/0588-drm-vc4-Verify-at-boot-that-CMA-doesn-t-cross-a-256M.patch b/target/linux/brcm2708/patches-4.4/0588-drm-vc4-Verify-at-boot-that-CMA-doesn-t-cross-a-256M.patch new file mode 100644 index 0000000..d09e6d3 --- /dev/null +++ b/target/linux/brcm2708/patches-4.4/0588-drm-vc4-Verify-at-boot-that-CMA-doesn-t-cross-a-256M.patch @@ -0,0 +1,88 @@ +From bf4b7e8817115f839241e55add244cf60225e436 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(+) + +diff --git a/drivers/base/dma-contiguous.c b/drivers/base/dma-contiguous.c +index e167a1e1..60f5c25 100644 +--- 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. +diff --git a/drivers/gpu/drm/vc4/vc4_v3d.c b/drivers/gpu/drm/vc4/vc4_v3d.c +index 7cc346a..1d9e5a6 100644 +--- 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 *dev, struct device *master, void *data) + 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; +diff --git a/mm/cma.c b/mm/cma.c +index bd0e141..efac29b 100644 +--- a/mm/cma.c ++++ b/mm/cma.c +@@ -47,11 +47,13 @@ phys_addr_t cma_get_base(const struct cma *cma) + { + 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) +-- +2.1.4 + |