88fe429db0
There's an entire pile of issues in here: - Use the main RING_HEAD register, not ACTHD. ACTHD points at the gtt offset of the batch buffer when a batch is executed. Semaphores are always emitted to the main ring, so we always want to look at that. - Mask the obtained HEAD pointer with the actual ring size, which is much smaller. Together with the above issue this resulted us in trying to dereference a pointer way outside of the ring mmio mapping. The resulting invalid access in interrupt context (hangcheck is executed from timers) lead to a full blown kernel panic. The fbcon panic handler then tried to frob our driver harder, resulting in a full machine hang at least on my snb here where I've stumbled over this. - Handle ring wrapping correctly and be a bit more explicit about how many dwords we're scanning. We probably should also scan more than just 4 ... - Space out some of teh computations for readability. This reduces hard-hangs on my snb here. Mika and QA both say that it doesn't completel remove them, but at least for me it's a clear improvement in stability. Cc: Mika Kuoppala <mika.kuoppala@intel.com> Cc: Ben Widawsky <ben@bwidawsk.net> Cc: Chris Wilson <chris@chris-wilson.co.uk> References: https://bugs.freedesktop.org/show_bug.cgi?id=74100 Reviewed-by: Mika Kuoppala <mika.kuoppala@intel.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> |
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.. | ||
armada | ||
ast | ||
bochs | ||
cirrus | ||
exynos | ||
gma500 | ||
i2c | ||
i810 | ||
i915 | ||
mga | ||
mgag200 | ||
msm | ||
nouveau | ||
omapdrm | ||
panel | ||
qxl | ||
r128 | ||
radeon | ||
rcar-du | ||
savage | ||
shmobile | ||
sis | ||
tdfx | ||
tegra | ||
tilcdc | ||
ttm | ||
udl | ||
via | ||
vmwgfx | ||
ati_pcigart.c | ||
drm_agpsupport.c | ||
drm_auth.c | ||
drm_buffer.c | ||
drm_bufs.c | ||
drm_cache.c | ||
drm_context.c | ||
drm_crtc.c | ||
drm_crtc_helper.c | ||
drm_crtc_internal.h | ||
drm_debugfs.c | ||
drm_dma.c | ||
drm_dp_helper.c | ||
drm_drv.c | ||
drm_edid.c | ||
drm_edid_load.c | ||
drm_encoder_slave.c | ||
drm_fb_cma_helper.c | ||
drm_fb_helper.c | ||
drm_flip_work.c | ||
drm_fops.c | ||
drm_gem.c | ||
drm_gem_cma_helper.c | ||
drm_global.c | ||
drm_hashtab.c | ||
drm_info.c | ||
drm_ioc32.c | ||
drm_ioctl.c | ||
drm_irq.c | ||
drm_lock.c | ||
drm_memory.c | ||
drm_mipi_dsi.c | ||
drm_mm.c | ||
drm_modes.c | ||
drm_panel.c | ||
drm_pci.c | ||
drm_platform.c | ||
drm_prime.c | ||
drm_rect.c | ||
drm_scatter.c | ||
drm_stub.c | ||
drm_sysfs.c | ||
drm_trace.h | ||
drm_trace_points.c | ||
drm_usb.c | ||
drm_vm.c | ||
drm_vma_manager.c | ||
Kconfig | ||
Makefile | ||
README.drm |
************************************************************ * For the very latest on DRI development, please see: * * http://dri.freedesktop.org/ * ************************************************************ The Direct Rendering Manager (drm) is a device-independent kernel-level device driver that provides support for the XFree86 Direct Rendering Infrastructure (DRI). The DRM supports the Direct Rendering Infrastructure (DRI) in four major ways: 1. The DRM provides synchronized access to the graphics hardware via the use of an optimized two-tiered lock. 2. The DRM enforces the DRI security policy for access to the graphics hardware by only allowing authenticated X11 clients access to restricted regions of memory. 3. The DRM provides a generic DMA engine, complete with multiple queues and the ability to detect the need for an OpenGL context switch. 4. The DRM is extensible via the use of small device-specific modules that rely extensively on the API exported by the DRM module. Documentation on the DRI is available from: http://dri.freedesktop.org/wiki/Documentation http://sourceforge.net/project/showfiles.php?group_id=387 http://dri.sourceforge.net/doc/ For specific information about kernel-level support, see: The Direct Rendering Manager, Kernel Support for the Direct Rendering Infrastructure http://dri.sourceforge.net/doc/drm_low_level.html Hardware Locking for the Direct Rendering Infrastructure http://dri.sourceforge.net/doc/hardware_locking_low_level.html A Security Analysis of the Direct Rendering Infrastructure http://dri.sourceforge.net/doc/security_low_level.html