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A fence may be signaled from any context, including from inside a timer. One example is timer_i915_sw_fence_wake() which is used to provide a safety-net when waiting on an external fence. If the external fence is not signaled within a timely fashion, we signal our fence on its behalf, and so we then may process subsequent fences in the chain from within that timer context. Given that dma_i915_sw_fence_wake() may be from inside a timer, we cannot then use del_timer_sync() as that requires the timer lock for itself. To circumvent this, while trying to keep the signal propagation as low latency as possible, move the completion into a worker and use a bit of atomic switheroo to serialise the timer-callback and the dma-callback. Testcase: igt/gem_eio/in-flight-external Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20170911084135.22903-3-chris@chris-wilson.co.uk Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
134 lines
4.3 KiB
Plaintext
134 lines
4.3 KiB
Plaintext
config DRM_I915
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tristate "Intel 8xx/9xx/G3x/G4x/HD Graphics"
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depends on DRM
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depends on X86 && PCI
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select INTEL_GTT
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select INTERVAL_TREE
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# we need shmfs for the swappable backing store, and in particular
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# the shmem_readpage() which depends upon tmpfs
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select SHMEM
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select TMPFS
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select DRM_KMS_HELPER
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select DRM_PANEL
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select DRM_MIPI_DSI
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select RELAY
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select IRQ_WORK
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# i915 depends on ACPI_VIDEO when ACPI is enabled
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# but for select to work, need to select ACPI_VIDEO's dependencies, ick
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select BACKLIGHT_LCD_SUPPORT if ACPI
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select BACKLIGHT_CLASS_DEVICE if ACPI
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select INPUT if ACPI
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select ACPI_VIDEO if ACPI
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select ACPI_BUTTON if ACPI
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select SYNC_FILE
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select IOSF_MBI
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select CRC32
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help
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Choose this option if you have a system that has "Intel Graphics
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Media Accelerator" or "HD Graphics" integrated graphics,
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including 830M, 845G, 852GM, 855GM, 865G, 915G, 945G, 965G,
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G35, G41, G43, G45 chipsets and Celeron, Pentium, Core i3,
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Core i5, Core i7 as well as Atom CPUs with integrated graphics.
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This driver is used by the Intel driver in X.org 6.8 and
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XFree86 4.4 and above. It replaces the older i830 module that
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supported a subset of the hardware in older X.org releases.
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Note that the older i810/i815 chipsets require the use of the
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i810 driver instead, and the Atom z5xx series has an entirely
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different implementation.
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If "M" is selected, the module will be called i915.
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config DRM_I915_ALPHA_SUPPORT
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bool "Enable alpha quality support for new Intel hardware by default"
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depends on DRM_I915
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default n
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help
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Choose this option if you have new Intel hardware and want to enable
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the alpha quality i915 driver support for the hardware in this kernel
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version. You can also enable the support at runtime using the module
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parameter i915.alpha_support=1; this option changes the default for
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that module parameter.
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It is recommended to upgrade to a kernel version with proper support
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as soon as it is available. Generally fixes for platforms with alpha
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support are not backported to older kernels.
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If in doubt, say "N".
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config DRM_I915_CAPTURE_ERROR
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bool "Enable capturing GPU state following a hang"
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depends on DRM_I915
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default y
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help
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This option enables capturing the GPU state when a hang is detected.
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This information is vital for triaging hangs and assists in debugging.
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Please report any hang to
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https://bugs.freedesktop.org/enter_bug.cgi?product=DRI
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for triaging.
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If in doubt, say "Y".
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config DRM_I915_COMPRESS_ERROR
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bool "Compress GPU error state"
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depends on DRM_I915_CAPTURE_ERROR
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select ZLIB_DEFLATE
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default y
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help
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This option selects ZLIB_DEFLATE if it isn't already
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selected and causes any error state captured upon a GPU hang
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to be compressed using zlib.
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If in doubt, say "Y".
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config DRM_I915_USERPTR
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bool "Always enable userptr support"
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depends on DRM_I915
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select MMU_NOTIFIER
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default y
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help
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This option selects CONFIG_MMU_NOTIFIER if it isn't already
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selected to enabled full userptr support.
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If in doubt, say "Y".
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config DRM_I915_GVT
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bool "Enable Intel GVT-g graphics virtualization host support"
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depends on DRM_I915
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depends on 64BIT
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default n
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help
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Choose this option if you want to enable Intel GVT-g graphics
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virtualization technology host support with integrated graphics.
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With GVT-g, it's possible to have one integrated graphics
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device shared by multiple VMs under different hypervisors.
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Note that at least one hypervisor like Xen or KVM is required for
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this driver to work, and it only supports newer device from
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Broadwell+. For further information and setup guide, you can
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visit: http://01.org/igvt-g.
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Now it's just a stub to support the modifications of i915 for
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GVT device model. It requires at least one MPT modules for Xen/KVM
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and other components of GVT device model to work. Use it under
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you own risk.
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If in doubt, say "N".
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config DRM_I915_GVT_KVMGT
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tristate "Enable KVM/VFIO support for Intel GVT-g"
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depends on DRM_I915_GVT
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depends on KVM
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depends on VFIO_MDEV && VFIO_MDEV_DEVICE
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default n
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help
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Choose this option if you want to enable KVMGT support for
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Intel GVT-g.
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menu "drm/i915 Debugging"
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depends on DRM_I915
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depends on EXPERT
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source drivers/gpu/drm/i915/Kconfig.debug
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endmenu
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