From: Sam Ravnborg <sam@xxxxxxxxxxxx>
[ Upstream commit 2a1658bf922ffd9b7907e270a7d9cdc9643fc45d ]
Recent kernels have been reported to panic using the bochs_drm
framebuffer under qemu-system-sparc64 which was bisected to
commit 7a0483ac4ffc ("drm/bochs: switch to generic drm fbdev emulation").
The backtrace indicates that the shadow framebuffer copy in
drm_fb_helper_dirty_blit_real() is trying to access the real
framebuffer using a virtual address rather than use an IO access
typically implemented using a physical (ASI_PHYS) access on SPARC.
The fix is to replace the memcpy with memcpy_toio() from io.h.
memcpy_toio() uses writeb() where the original fbdev code
used sbus_memcpy_toio(). The latter uses sbus_writeb().
The difference between writeb() and sbus_memcpy_toio() is
that writeb() writes bytes in little-endian, where sbus_writeb() writes
bytes in big-endian. As endian does not matter for byte writes they are
the same. So we can safely use memcpy_toio() here.
Note that this only fixes bochs, in general fbdev helpers still have
issues with mixing up system memory and __iomem space. Fixing that will
require a lot more work.
v3:
- Improved changelog (Daniel)
- Added FIXME to fbdev_use_iomem (Daniel)
v2:
- Added missing __iomem cast (kernel test robot)
- Made changelog readable and fix typos (Mark)
- Add flag to select iomem - and set it in the bochs driver
Signed-off-by: Sam Ravnborg <sam@xxxxxxxxxxxx>
Reported-by: Mark Cave-Ayland <mark.cave-ayland@xxxxxxxxxxxx>
Reported-by: kernel test robot <lkp@xxxxxxxxx>
Tested-by: Mark Cave-Ayland <mark.cave-ayland@xxxxxxxxxxxx>
Reviewed-by: Daniel Vetter <daniel.vetter@xxxxxxxx>
Cc: Mark Cave-Ayland <mark.cave-ayland@xxxxxxxxxxxx>
Cc: Thomas Zimmermann <tzimmermann@xxxxxxx>
Cc: Gerd Hoffmann <kraxel@xxxxxxxxxx>
Cc: "David S. Miller" <davem@xxxxxxxxxxxxx>
Cc: sparclinux@xxxxxxxxxxxxxxx
Link: https://patchwork.freedesktop.org/patch/msgid/20200709193016.291267-1-sam@xxxxxxxxxxxx
Link: https://patchwork.freedesktop.org/patch/msgid/20200725191012.GA434957@xxxxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/gpu/drm/bochs/bochs_kms.c | 1 +
drivers/gpu/drm/drm_fb_helper.c | 6 +++++-
include/drm/drm_mode_config.h | 12 ++++++++++++
3 files changed, 18 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/bochs/bochs_kms.c b/drivers/gpu/drm/bochs/bochs_kms.c
index 8066d7d370d5b..200d55fa97656 100644
--- a/drivers/gpu/drm/bochs/bochs_kms.c
+++ b/drivers/gpu/drm/bochs/bochs_kms.c
@@ -143,6 +143,7 @@ int bochs_kms_init(struct bochs_device *bochs)
bochs->dev->mode_config.preferred_depth = 24;
bochs->dev->mode_config.prefer_shadow = 0;
bochs->dev->mode_config.prefer_shadow_fbdev = 1;
+ bochs->dev->mode_config.fbdev_use_iomem = true;
bochs->dev->mode_config.quirk_addfb_prefer_host_byte_order = true;
bochs->dev->mode_config.funcs = &bochs_mode_funcs;
diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index c7be39a00d437..4dd12a069474a 100644
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -399,7 +399,11 @@ static void drm_fb_helper_dirty_blit_real(struct drm_fb_helper *fb_helper,
unsigned int y;
for (y = clip->y1; y < clip->y2; y++) {
- memcpy(dst, src, len);
+ if (!fb_helper->dev->mode_config.fbdev_use_iomem)
+ memcpy(dst, src, len);
+ else
+ memcpy_toio((void __iomem *)dst, src, len);
+
src += fb->pitches[0];
dst += fb->pitches[0];
}
diff --git a/include/drm/drm_mode_config.h b/include/drm/drm_mode_config.h
index 3bcbe30339f04..198b9d0600081 100644
--- a/include/drm/drm_mode_config.h
+++ b/include/drm/drm_mode_config.h
@@ -865,6 +865,18 @@ struct drm_mode_config {
*/
bool prefer_shadow_fbdev;
+ /**
+ * @fbdev_use_iomem:
+ *
+ * Set to true if framebuffer reside in iomem.
+ * When set to true memcpy_toio() is used when copying the framebuffer in
+ * drm_fb_helper.drm_fb_helper_dirty_blit_real().
+ *
+ * FIXME: This should be replaced with a per-mapping is_iomem
+ * flag (like ttm does), and then used everywhere in fbdev code.
+ */
+ bool fbdev_use_iomem;
+
/**
* @quirk_addfb_prefer_xbgr_30bpp:
*
--
2.25.1
