mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-28 09:39:00 +00:00
8c405cdccc
The patches were generated from the RPi repo with the following command: git format-patch v6.6.34..rpi-6.1.y Some patches needed rebasing and, as usual, the applied and reverted, wireless drivers, Github workflows, READMEs and defconfigs patches were removed. Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
79 lines
2.6 KiB
Diff
79 lines
2.6 KiB
Diff
From 27aa35221819fec513ce1b886fba3b0ab6504245 Mon Sep 17 00:00:00 2001
|
|
From: Dave Stevenson <dave.stevenson@raspberrypi.com>
|
|
Date: Wed, 22 Nov 2023 19:17:44 +0000
|
|
Subject: [PATCH 0743/1085] drm: vc4: Block swiotlb bounce buffers being
|
|
imported as dmabuf
|
|
|
|
The dmabuf import already checks that the backing buffer is contiguous
|
|
and rejects it if it isn't. vc4 also requires that the buffer is
|
|
in the bottom 1GB of RAM, and this is all correctly defined via
|
|
dma-ranges.
|
|
|
|
However the kernel silently uses swiotlb to bounce dma buffers
|
|
around if they are in the wrong region. This relies on dma sync
|
|
functions to be called in order to copy the data to/from the
|
|
bounce buffer.
|
|
|
|
DRM is based on all memory allocations being coherent with the
|
|
GPU so that any updates to a framebuffer will be acted on without
|
|
the need for any additional update. This is fairly fundamentally
|
|
incompatible with needing to call dma_sync_ to handle the bounce
|
|
buffer copies, and therefore we have to detect and reject mappings
|
|
that use bounce buffers.
|
|
|
|
Signed-off-by: Dave Stevenson <dave.stevenson@raspberrypi.com>
|
|
---
|
|
drivers/gpu/drm/vc4/vc4_drv.c | 20 ++++++++++++++++++--
|
|
1 file changed, 18 insertions(+), 2 deletions(-)
|
|
|
|
--- a/drivers/gpu/drm/vc4/vc4_drv.c
|
|
+++ b/drivers/gpu/drm/vc4/vc4_drv.c
|
|
@@ -29,6 +29,7 @@
|
|
#include <linux/of_device.h>
|
|
#include <linux/platform_device.h>
|
|
#include <linux/pm_runtime.h>
|
|
+#include <linux/dma-direct.h>
|
|
|
|
#include <drm/drm_aperture.h>
|
|
#include <drm/drm_atomic_helper.h>
|
|
@@ -175,6 +176,19 @@ static void vc4_close(struct drm_device
|
|
kfree(vc4file);
|
|
}
|
|
|
|
+struct drm_gem_object *
|
|
+vc4_prime_import_sg_table(struct drm_device *dev,
|
|
+ struct dma_buf_attachment *attach,
|
|
+ struct sg_table *sgt)
|
|
+{
|
|
+ phys_addr_t phys = dma_to_phys(dev->dev, sg_dma_address(sgt->sgl));
|
|
+
|
|
+ if (is_swiotlb_buffer(dev->dev, phys))
|
|
+ return ERR_PTR(-EINVAL);
|
|
+
|
|
+ return drm_gem_dma_prime_import_sg_table(dev, attach, sgt);
|
|
+}
|
|
+
|
|
DEFINE_DRM_GEM_FOPS(vc4_drm_fops);
|
|
|
|
static const struct drm_ioctl_desc vc4_drm_ioctls[] = {
|
|
@@ -211,7 +225,8 @@ const struct drm_driver vc4_drm_driver =
|
|
|
|
.gem_create_object = vc4_create_object,
|
|
|
|
- DRM_GEM_DMA_DRIVER_OPS_WITH_DUMB_CREATE(vc4_bo_dumb_create),
|
|
+ .dumb_create = vc4_bo_dumb_create,
|
|
+ .gem_prime_import_sg_table = vc4_prime_import_sg_table,
|
|
|
|
.ioctls = vc4_drm_ioctls,
|
|
.num_ioctls = ARRAY_SIZE(vc4_drm_ioctls),
|
|
@@ -234,7 +249,8 @@ const struct drm_driver vc5_drm_driver =
|
|
.debugfs_init = vc4_debugfs_init,
|
|
#endif
|
|
|
|
- DRM_GEM_DMA_DRIVER_OPS_WITH_DUMB_CREATE(vc5_dumb_create),
|
|
+ .dumb_create = vc5_dumb_create,
|
|
+ .gem_prime_import_sg_table = vc4_prime_import_sg_table,
|
|
|
|
.fops = &vc4_drm_fops,
|
|
|