![]() ![]() Firmware can be any generic interface, such as EFI, The functionĮxpects the framebuffer to be provided by a platform device that has been Installs the given device as the new owner of the framebuffer. The framebuffer’s byte offset in physical memory resource_size_t size The DRM device to own the framebuffer memory resource_size_t base That can have their framebuffer located anywhere in memory.Ġ on success, or a negative errno code otherwise int devm_aperture_acquire_from_firmware ( struct drm_device * dev, resource_size_t base, resource_size_t size ) ¶Īcquires ownership of a firmware framebuffer on behalf of a DRM driver. This function removes all graphics device drivers. int drm_aperture_remove_framebuffers ( bool primary, const struct drm_driver * req_driver ) ¶Īlso kick vga16fb if present const struct drm_driver *req_driver May not access the device’s registers, framebuffer memory, ROM, etcĪfterwards. ![]() Platform_device_unregister() and the generic driver unloads itself. When a driver calls drm_aperture_remove_conflicting_framebuffers() et alįor the registered framebuffer range, the aperture helpers call Only works for platform drivers that support hot unplug. The generic driver is now subject to forced removal by other drivers. Parameters that control DRM driver registration.īelow is an example of initializing a DRM driver for a device on the Module helpers, such as module_pci_driver(), but respect additional The provided helpers act like bus-specific This library provides helpers registering DRM drivers during module Kernel log at initialization time and passes it to userspace through theĭRM_IOCTL_VERSION ioctl. The driver date, formatted as YYYYMMDD, is meant to identify the date of Userspace through the DRM_IOCTL_VERSION ioctl and otherwise unused by The driver description is a purely informative string passed to Used for IRQ registration and passed to userspace through The driver name is printed to the kernel log at initialization time, Otherwise the driver’s set_version() method will beĬalled with the requested version. Is larger than the driver minor, the DRM_IOCTL_SET_VERSION call will Requested major isn’t equal to the driver major, or the requested minor When the driver APIĬhanges between minor versions, applications can callĭRM_IOCTL_SET_VERSION to select a specific version of the API. The major and minor numbers are also used to verify the requested driverĪPI version passed to DRM_IOCTL_SET_VERSION. Initialization time and passed to userspace through the The information is printed to the kernel log at The DRM core identifies driver versions by a major, minor and patch Driver Information ¶ Major, Minor and Patchlevel ¶ Then describe individual operations in details as they get used in later We will first go through the struct drm_driver static information fields, and will Supports, and pointers to methods that the DRM core will call to It accessible from userspace) using drm_dev_register().Ĭontains static information that describes the driver and features it ![]() After theĭevice instance is fully initialized it can be registered (which makes Drivers typically statically initializeĪ drm_driver structure, and then pass it toĭrm_dev_alloc() to allocate a device instance. Management, command submission & fencing, suspend/resume support, andĪt the core of every DRM driver is a struct drm_driver structure. These include vblankĮvent handling, memory management, output management, framebuffer The library that wraps most of the DRM ioctls. Them driven by the application interfaces it provides through libdrm, The DRM layer provides several services to graphics drivers, many of In more detail, providing implementation notes and examples. Setting up command buffers, creating an initial output configuration,Īnd initializing core services. This chapter documents DRM internals relevant to driver authors andĭevelopers working to add support for the latest features to existingįirst, we go over some typical driver initialization requirements, like
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