Documentation/gpu: split up the gpu documentation
Make the gpu documentation easier to manage by splitting to separate files. Again, this is just the split, no real edits. Signed-off-by: Jani Nikula <jani.nikula@intel.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: http://patchwork.freedesktop.org/patch/msgid/bd2b599b5105c28c8f05923005e6cc9b7efa7fc1.1466506505.git.jani.nikula@intel.com
This commit is contained in:
Jani Nikula
Daniel Vetter
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cb597fcea5
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Userland interfaces
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===================
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The DRM core exports several interfaces to applications, generally
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intended to be used through corresponding libdrm wrapper functions. In
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addition, drivers export device-specific interfaces for use by userspace
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drivers & device-aware applications through ioctls and sysfs files.
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External interfaces include: memory mapping, context management, DMA
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operations, AGP management, vblank control, fence management, memory
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management, and output management.
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Cover generic ioctls and sysfs layout here. We only need high-level
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info, since man pages should cover the rest.
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Render nodes
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------------
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DRM core provides multiple character-devices for user-space to use.
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Depending on which device is opened, user-space can perform a different
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set of operations (mainly ioctls). The primary node is always created
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and called card<num>. Additionally, a currently unused control node,
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called controlD<num> is also created. The primary node provides all
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legacy operations and historically was the only interface used by
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userspace. With KMS, the control node was introduced. However, the
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planned KMS control interface has never been written and so the control
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node stays unused to date.
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With the increased use of offscreen renderers and GPGPU applications,
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clients no longer require running compositors or graphics servers to
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make use of a GPU. But the DRM API required unprivileged clients to
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authenticate to a DRM-Master prior to getting GPU access. To avoid this
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step and to grant clients GPU access without authenticating, render
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nodes were introduced. Render nodes solely serve render clients, that
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is, no modesetting or privileged ioctls can be issued on render nodes.
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Only non-global rendering commands are allowed. If a driver supports
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render nodes, it must advertise it via the DRIVER_RENDER DRM driver
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capability. If not supported, the primary node must be used for render
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clients together with the legacy drmAuth authentication procedure.
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If a driver advertises render node support, DRM core will create a
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separate render node called renderD<num>. There will be one render node
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per device. No ioctls except PRIME-related ioctls will be allowed on
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this node. Especially GEM_OPEN will be explicitly prohibited. Render
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nodes are designed to avoid the buffer-leaks, which occur if clients
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guess the flink names or mmap offsets on the legacy interface.
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Additionally to this basic interface, drivers must mark their
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driver-dependent render-only ioctls as DRM_RENDER_ALLOW so render
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clients can use them. Driver authors must be careful not to allow any
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privileged ioctls on render nodes.
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With render nodes, user-space can now control access to the render node
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via basic file-system access-modes. A running graphics server which
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authenticates clients on the privileged primary/legacy node is no longer
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required. Instead, a client can open the render node and is immediately
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granted GPU access. Communication between clients (or servers) is done
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via PRIME. FLINK from render node to legacy node is not supported. New
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clients must not use the insecure FLINK interface.
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Besides dropping all modeset/global ioctls, render nodes also drop the
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DRM-Master concept. There is no reason to associate render clients with
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a DRM-Master as they are independent of any graphics server. Besides,
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they must work without any running master, anyway. Drivers must be able
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to run without a master object if they support render nodes. If, on the
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other hand, a driver requires shared state between clients which is
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visible to user-space and accessible beyond open-file boundaries, they
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cannot support render nodes.
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VBlank event handling
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---------------------
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The DRM core exposes two vertical blank related ioctls:
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DRM_IOCTL_WAIT_VBLANK
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This takes a struct drm_wait_vblank structure as its argument, and
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it is used to block or request a signal when a specified vblank
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event occurs.
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DRM_IOCTL_MODESET_CTL
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This was only used for user-mode-settind drivers around modesetting
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changes to allow the kernel to update the vblank interrupt after
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mode setting, since on many devices the vertical blank counter is
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reset to 0 at some point during modeset. Modern drivers should not
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call this any more since with kernel mode setting it is a no-op.
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This second part of the GPU Driver Developer's Guide documents driver
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code, implementation details and also all the driver-specific userspace
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interfaces. Especially since all hardware-acceleration interfaces to
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userspace are driver specific for efficiency and other reasons these
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interfaces can be rather substantial. Hence every driver has its own
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chapter.
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drm/i915 Intel GFX Driver
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=========================
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The drm/i915 driver supports all (with the exception of some very early
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models) integrated GFX chipsets with both Intel display and rendering
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blocks. This excludes a set of SoC platforms with an SGX rendering unit,
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those have basic support through the gma500 drm driver.
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Core Driver Infrastructure
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--------------------------
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This section covers core driver infrastructure used by both the display
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and the GEM parts of the driver.
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Runtime Power Management
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~~~~~~~~~~~~~~~~~~~~~~~~
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.. kernel-doc:: drivers/gpu/drm/i915/intel_runtime_pm.c
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:doc: runtime pm
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.. kernel-doc:: drivers/gpu/drm/i915/intel_runtime_pm.c
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:internal:
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.. kernel-doc:: drivers/gpu/drm/i915/intel_uncore.c
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:internal:
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Interrupt Handling
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~~~~~~~~~~~~~~~~~~
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.. kernel-doc:: drivers/gpu/drm/i915/i915_irq.c
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:doc: interrupt handling
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.. kernel-doc:: drivers/gpu/drm/i915/i915_irq.c
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:functions: intel_irq_init intel_irq_init_hw intel_hpd_init
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.. kernel-doc:: drivers/gpu/drm/i915/i915_irq.c
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:functions: intel_runtime_pm_disable_interrupts
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.. kernel-doc:: drivers/gpu/drm/i915/i915_irq.c
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:functions: intel_runtime_pm_enable_interrupts
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Intel GVT-g Guest Support(vGPU)
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.. kernel-doc:: drivers/gpu/drm/i915/i915_vgpu.c
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:doc: Intel GVT-g guest support
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.. kernel-doc:: drivers/gpu/drm/i915/i915_vgpu.c
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:internal:
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Display Hardware Handling
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-------------------------
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This section covers everything related to the display hardware including
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the mode setting infrastructure, plane, sprite and cursor handling and
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display, output probing and related topics.
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Mode Setting Infrastructure
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~~~~~~~~~~~~~~~~~~~~~~~~~~~
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The i915 driver is thus far the only DRM driver which doesn't use the
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common DRM helper code to implement mode setting sequences. Thus it has
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its own tailor-made infrastructure for executing a display configuration
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change.
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Frontbuffer Tracking
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~~~~~~~~~~~~~~~~~~~~
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.. kernel-doc:: drivers/gpu/drm/i915/intel_frontbuffer.c
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:doc: frontbuffer tracking
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.. kernel-doc:: drivers/gpu/drm/i915/intel_frontbuffer.c
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:internal:
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.. kernel-doc:: drivers/gpu/drm/i915/i915_gem.c
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:functions: i915_gem_track_fb
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Display FIFO Underrun Reporting
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.. kernel-doc:: drivers/gpu/drm/i915/intel_fifo_underrun.c
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:doc: fifo underrun handling
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.. kernel-doc:: drivers/gpu/drm/i915/intel_fifo_underrun.c
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:internal:
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Plane Configuration
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~~~~~~~~~~~~~~~~~~~
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This section covers plane configuration and composition with the primary
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plane, sprites, cursors and overlays. This includes the infrastructure
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to do atomic vsync'ed updates of all this state and also tightly coupled
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topics like watermark setup and computation, framebuffer compression and
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panel self refresh.
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Atomic Plane Helpers
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~~~~~~~~~~~~~~~~~~~~
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.. kernel-doc:: drivers/gpu/drm/i915/intel_atomic_plane.c
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:doc: atomic plane helpers
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.. kernel-doc:: drivers/gpu/drm/i915/intel_atomic_plane.c
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:internal:
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Output Probing
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~~~~~~~~~~~~~~
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This section covers output probing and related infrastructure like the
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hotplug interrupt storm detection and mitigation code. Note that the
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i915 driver still uses most of the common DRM helper code for output
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probing, so those sections fully apply.
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Hotplug
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~~~~~~~
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.. kernel-doc:: drivers/gpu/drm/i915/intel_hotplug.c
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:doc: Hotplug
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.. kernel-doc:: drivers/gpu/drm/i915/intel_hotplug.c
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:internal:
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High Definition Audio
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~~~~~~~~~~~~~~~~~~~~~
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.. kernel-doc:: drivers/gpu/drm/i915/intel_audio.c
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:doc: High Definition Audio over HDMI and Display Port
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.. kernel-doc:: drivers/gpu/drm/i915/intel_audio.c
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:internal:
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.. kernel-doc:: include/drm/i915_component.h
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:internal:
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Panel Self Refresh PSR (PSR/SRD)
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.. kernel-doc:: drivers/gpu/drm/i915/intel_psr.c
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:doc: Panel Self Refresh (PSR/SRD)
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.. kernel-doc:: drivers/gpu/drm/i915/intel_psr.c
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:internal:
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Frame Buffer Compression (FBC)
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.. kernel-doc:: drivers/gpu/drm/i915/intel_fbc.c
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:doc: Frame Buffer Compression (FBC)
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.. kernel-doc:: drivers/gpu/drm/i915/intel_fbc.c
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:internal:
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Display Refresh Rate Switching (DRRS)
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.. kernel-doc:: drivers/gpu/drm/i915/intel_dp.c
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:doc: Display Refresh Rate Switching (DRRS)
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.. kernel-doc:: drivers/gpu/drm/i915/intel_dp.c
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:functions: intel_dp_set_drrs_state
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.. kernel-doc:: drivers/gpu/drm/i915/intel_dp.c
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:functions: intel_edp_drrs_enable
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.. kernel-doc:: drivers/gpu/drm/i915/intel_dp.c
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:functions: intel_edp_drrs_disable
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.. kernel-doc:: drivers/gpu/drm/i915/intel_dp.c
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:functions: intel_edp_drrs_invalidate
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.. kernel-doc:: drivers/gpu/drm/i915/intel_dp.c
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:functions: intel_edp_drrs_flush
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.. kernel-doc:: drivers/gpu/drm/i915/intel_dp.c
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:functions: intel_dp_drrs_init
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DPIO
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~~~~
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.. kernel-doc:: drivers/gpu/drm/i915/i915_reg.h
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:doc: DPIO
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CSR firmware support for DMC
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.. kernel-doc:: drivers/gpu/drm/i915/intel_csr.c
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:doc: csr support for dmc
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.. kernel-doc:: drivers/gpu/drm/i915/intel_csr.c
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:internal:
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Video BIOS Table (VBT)
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~~~~~~~~~~~~~~~~~~~~~~
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.. kernel-doc:: drivers/gpu/drm/i915/intel_bios.c
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:doc: Video BIOS Table (VBT)
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.. kernel-doc:: drivers/gpu/drm/i915/intel_bios.c
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:internal:
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.. kernel-doc:: drivers/gpu/drm/i915/intel_vbt_defs.h
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:internal:
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Memory Management and Command Submission
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----------------------------------------
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This sections covers all things related to the GEM implementation in the
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i915 driver.
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Batchbuffer Parsing
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~~~~~~~~~~~~~~~~~~~
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.. kernel-doc:: drivers/gpu/drm/i915/i915_cmd_parser.c
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:doc: batch buffer command parser
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.. kernel-doc:: drivers/gpu/drm/i915/i915_cmd_parser.c
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:internal:
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Batchbuffer Pools
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~~~~~~~~~~~~~~~~~
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.. kernel-doc:: drivers/gpu/drm/i915/i915_gem_batch_pool.c
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:doc: batch pool
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.. kernel-doc:: drivers/gpu/drm/i915/i915_gem_batch_pool.c
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:internal:
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Logical Rings, Logical Ring Contexts and Execlists
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.. kernel-doc:: drivers/gpu/drm/i915/intel_lrc.c
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:doc: Logical Rings, Logical Ring Contexts and Execlists
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.. kernel-doc:: drivers/gpu/drm/i915/intel_lrc.c
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:internal:
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Global GTT views
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~~~~~~~~~~~~~~~~
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.. kernel-doc:: drivers/gpu/drm/i915/i915_gem_gtt.c
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:doc: Global GTT views
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.. kernel-doc:: drivers/gpu/drm/i915/i915_gem_gtt.c
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:internal:
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GTT Fences and Swizzling
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~~~~~~~~~~~~~~~~~~~~~~~~
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.. kernel-doc:: drivers/gpu/drm/i915/i915_gem_fence.c
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:internal:
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Global GTT Fence Handling
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^^^^^^^^^^^^^^^^^^^^^^^^^
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.. kernel-doc:: drivers/gpu/drm/i915/i915_gem_fence.c
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:doc: fence register handling
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Hardware Tiling and Swizzling Details
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^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
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.. kernel-doc:: drivers/gpu/drm/i915/i915_gem_fence.c
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:doc: tiling swizzling details
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Object Tiling IOCTLs
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~~~~~~~~~~~~~~~~~~~~
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.. kernel-doc:: drivers/gpu/drm/i915/i915_gem_tiling.c
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:internal:
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.. kernel-doc:: drivers/gpu/drm/i915/i915_gem_tiling.c
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:doc: buffer object tiling
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Buffer Object Eviction
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~~~~~~~~~~~~~~~~~~~~~~
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This section documents the interface functions for evicting buffer
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objects to make space available in the virtual gpu address spaces. Note
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that this is mostly orthogonal to shrinking buffer objects caches, which
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has the goal to make main memory (shared with the gpu through the
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unified memory architecture) available.
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.. kernel-doc:: drivers/gpu/drm/i915/i915_gem_evict.c
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:internal:
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Buffer Object Memory Shrinking
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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This section documents the interface function for shrinking memory usage
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of buffer object caches. Shrinking is used to make main memory
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available. Note that this is mostly orthogonal to evicting buffer
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objects, which has the goal to make space in gpu virtual address spaces.
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.. kernel-doc:: drivers/gpu/drm/i915/i915_gem_shrinker.c
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:internal:
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GuC
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---
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GuC-specific firmware loader
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.. kernel-doc:: drivers/gpu/drm/i915/intel_guc_loader.c
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:doc: GuC-specific firmware loader
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.. kernel-doc:: drivers/gpu/drm/i915/intel_guc_loader.c
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:internal:
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GuC-based command submission
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.. kernel-doc:: drivers/gpu/drm/i915/i915_guc_submission.c
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:doc: GuC-based command submission
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.. kernel-doc:: drivers/gpu/drm/i915/i915_guc_submission.c
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:internal:
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GuC Firmware Layout
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~~~~~~~~~~~~~~~~~~~
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.. kernel-doc:: drivers/gpu/drm/i915/intel_guc_fwif.h
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:doc: GuC Firmware Layout
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Tracing
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-------
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This sections covers all things related to the tracepoints implemented
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in the i915 driver.
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i915_ppgtt_create and i915_ppgtt_release
|
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.. kernel-doc:: drivers/gpu/drm/i915/i915_trace.h
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:doc: i915_ppgtt_create and i915_ppgtt_release tracepoints
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|
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i915_context_create and i915_context_free
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~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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.. kernel-doc:: drivers/gpu/drm/i915/i915_trace.h
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:doc: i915_context_create and i915_context_free tracepoints
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switch_mm
|
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~~~~~~~~~~
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.. kernel-doc:: drivers/gpu/drm/i915/i915_trace.h
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:doc: switch_mm tracepoint
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.. WARNING: DOCPROC directive not supported: !Cdrivers/gpu/drm/i915/i915_irq.c
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File diff suppressed because it is too large
Load Diff
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@ -0,0 +1,50 @@
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Introduction
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============
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The Linux DRM layer contains code intended to support the needs of
|
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complex graphics devices, usually containing programmable pipelines well
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suited to 3D graphics acceleration. Graphics drivers in the kernel may
|
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make use of DRM functions to make tasks like memory management,
|
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interrupt handling and DMA easier, and provide a uniform interface to
|
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applications.
|
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|
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A note on versions: this guide covers features found in the DRM tree,
|
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including the TTM memory manager, output configuration and mode setting,
|
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and the new vblank internals, in addition to all the regular features
|
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found in current kernels.
|
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|
||||
[Insert diagram of typical DRM stack here]
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Style Guidelines
|
||||
----------------
|
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|
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For consistency this documentation uses American English. Abbreviations
|
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are written as all-uppercase, for example: DRM, KMS, IOCTL, CRTC, and so
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on. To aid in reading, documentations make full use of the markup
|
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characters kerneldoc provides: @parameter for function parameters,
|
||||
@member for structure members, &structure to reference structures and
|
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function() for functions. These all get automatically hyperlinked if
|
||||
kerneldoc for the referenced objects exists. When referencing entries in
|
||||
function vtables please use ->vfunc(). Note that kerneldoc does not
|
||||
support referencing struct members directly, so please add a reference
|
||||
to the vtable struct somewhere in the same paragraph or at least
|
||||
section.
|
||||
|
||||
Except in special situations (to separate locked from unlocked variants)
|
||||
locking requirements for functions aren't documented in the kerneldoc.
|
||||
Instead locking should be check at runtime using e.g.
|
||||
``WARN_ON(!mutex_is_locked(...));``. Since it's much easier to ignore
|
||||
documentation than runtime noise this provides more value. And on top of
|
||||
that runtime checks do need to be updated when the locking rules change,
|
||||
increasing the chances that they're correct. Within the documentation
|
||||
the locking rules should be explained in the relevant structures: Either
|
||||
in the comment for the lock explaining what it protects, or data fields
|
||||
need a note about which lock protects them, or both.
|
||||
|
||||
Functions which have a non-\ ``void`` return value should have a section
|
||||
called "Returns" explaining the expected return values in different
|
||||
cases and their meanings. Currently there's no consensus whether that
|
||||
section name should be all upper-case or not, and whether it should end
|
||||
in a colon or not. Go with the file-local style. Other common section
|
||||
names are "Notes" with information for dangerous or tricky corner cases,
|
||||
and "FIXME" where the interface could be cleaned up.
|
||||
|
|
@ -0,0 +1,102 @@
|
|||
==============
|
||||
VGA Switcheroo
|
||||
==============
|
||||
|
||||
.. kernel-doc:: drivers/gpu/vga/vga_switcheroo.c
|
||||
:doc: Overview
|
||||
|
||||
Modes of Use
|
||||
============
|
||||
|
||||
Manual switching and manual power control
|
||||
-----------------------------------------
|
||||
|
||||
.. kernel-doc:: drivers/gpu/vga/vga_switcheroo.c
|
||||
:doc: Manual switching and manual power control
|
||||
|
||||
Driver power control
|
||||
--------------------
|
||||
|
||||
.. kernel-doc:: drivers/gpu/vga/vga_switcheroo.c
|
||||
:doc: Driver power control
|
||||
|
||||
API
|
||||
===
|
||||
|
||||
Public functions
|
||||
----------------
|
||||
|
||||
.. kernel-doc:: drivers/gpu/vga/vga_switcheroo.c
|
||||
:export:
|
||||
|
||||
Public structures
|
||||
-----------------
|
||||
|
||||
.. kernel-doc:: include/linux/vga_switcheroo.h
|
||||
:functions: vga_switcheroo_handler
|
||||
|
||||
.. kernel-doc:: include/linux/vga_switcheroo.h
|
||||
:functions: vga_switcheroo_client_ops
|
||||
|
||||
Public constants
|
||||
----------------
|
||||
|
||||
.. kernel-doc:: include/linux/vga_switcheroo.h
|
||||
:functions: vga_switcheroo_handler_flags_t
|
||||
|
||||
.. kernel-doc:: include/linux/vga_switcheroo.h
|
||||
:functions: vga_switcheroo_client_id
|
||||
|
||||
.. kernel-doc:: include/linux/vga_switcheroo.h
|
||||
:functions: vga_switcheroo_state
|
||||
|
||||
Private structures
|
||||
------------------
|
||||
|
||||
.. kernel-doc:: drivers/gpu/vga/vga_switcheroo.c
|
||||
:functions: vgasr_priv
|
||||
|
||||
.. kernel-doc:: drivers/gpu/vga/vga_switcheroo.c
|
||||
:functions: vga_switcheroo_client
|
||||
|
||||
Handlers
|
||||
========
|
||||
|
||||
apple-gmux Handler
|
||||
------------------
|
||||
|
||||
.. kernel-doc:: drivers/platform/x86/apple-gmux.c
|
||||
:doc: Overview
|
||||
|
||||
.. kernel-doc:: drivers/platform/x86/apple-gmux.c
|
||||
:doc: Interrupt
|
||||
|
||||
Graphics mux
|
||||
~~~~~~~~~~~~
|
||||
|
||||
.. kernel-doc:: drivers/platform/x86/apple-gmux.c
|
||||
:doc: Graphics mux
|
||||
|
||||
Power control
|
||||
~~~~~~~~~~~~~
|
||||
|
||||
.. kernel-doc:: drivers/platform/x86/apple-gmux.c
|
||||
:doc: Power control
|
||||
|
||||
Backlight control
|
||||
~~~~~~~~~~~~~~~~~
|
||||
|
||||
.. kernel-doc:: drivers/platform/x86/apple-gmux.c
|
||||
:doc: Backlight control
|
||||
|
||||
Public functions
|
||||
~~~~~~~~~~~~~~~~
|
||||
|
||||
.. kernel-doc:: include/linux/apple-gmux.h
|
||||
:internal:
|
||||
|
||||
.. WARNING: DOCPROC directive not supported: !Cdrivers/gpu/vga/vga_switcheroo.c
|
||||
|
||||
.. WARNING: DOCPROC directive not supported: !Cinclude/linux/vga_switcheroo.h
|
||||
|
||||
.. WARNING: DOCPROC directive not supported: !Cdrivers/platform/x86/apple-gmux.c
|
||||
Loading…
Reference in New Issue