Creating drm files

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Improve this question. Draemon MP3 is luckily DRM-free. Please don't. There are enough broken DRM systems already What happens when you no longer support your licence server? And this has happened repeatedly already I don't understand the down-vote on this one. It's a perfectly valid question.

Since the question is rather technical, religious views on DRM should not affect the answer or votes. As far as I can see, the question was not regarding users opinions on DRM. Add a comment. Active Oldest Votes. Offering PlayReady, Widevine, and FairPlay, we can help you deliver protected content to any device in any situation whether online or offline or both.

Established in , we are a market-leading Multi-DRM service provider. Over the last fifteen years we have seen drastic changes in the content protection arena as a variety of new technologies have entered the marketplace.

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Want to Learn More? Subscribe for Instant Notifications. Popular Posts. Divide the coordinates of rectangle r by horz and vert.

Calculate the intersection of rectangles r1 and r2. Clip rectangle dst by rectangle clip. Clip rectangle src by the same amounts multiplied by hscale and vscale. Typically this can be used to defer unref of framebuffer's, cursor bo's, etc until after vblank. The APIs are all safe and lockless for up to one producer and once consumer at a time. The single-consumer aspect is ensured by committing the queued work to a single work-queue.

The vma-manager is responsible to map arbitrary driver-dependent memory regions into the linear user address-space. Drivers shouldn't use this for object placement in VMEM.

This manager should only be used to manage mappings into linear user-space VMs. Hence, we use an rb-tree to speed up offset lookups. Otherwise, mm-core will be unable to tear down memory mappings as the VM will no longer be linear. This offset manager works on page-based addresses. That means, object sizes and offsets must always be page-aligned as usual. Additionally to offset management, the vma offset manager also handles access management. However, the caller is responsible for destroying already existing mappings, if required.

Initialize a new offset-manager. Both are interpreted as page-numbers, not bytes. However, node allocation and destruction is left for the caller. While calling into the vma-manager, a given node must always be guaranteed to be referenced. The caller must remove all allocated nodes before destroying the manager.

Find a node given a start address and object size. That is, start may point somewhere into a valid region and the given node will be returned, as long as the node spans the whole requested area given the size in number of pages as pages.

Returns NULL if no suitable node can be found. Otherwise, the best match is returned. It's the caller's responsibility to make sure the node doesn't get destroyed before the caller can access it. Add a node to the offset-manager. If the node was already added, this does nothing and return 0. After this call succeeds, you can access the offset of the node until it is removed again. However, no cleanup is required in that case. It only limits the size that user-space can map into their address space.

Remove a node from the offset manager. If the node wasn't added before, this does nothing. Add filp to the list of allowed open-files for this node. If filp is already on this list, the ref-count is incremented. You may even call it if the node is currently not added to any offset-manager. You must remove all open-files the same number of times as you added them before destroying the node. Otherwise, you will leak memory. Decrement the ref-count of filp in the list of allowed open-files on node.

If the ref-count drops to zero, remove filp from the list. It only returns the exact object with the given start address. Lock VMA manager for extended lookups. This lock must not be used for anything else than extended lookups. You must not call any other VMA helpers while holding this lock.

Release lookup-lock. Reset a node to its initial state. This must be called before using it with any VMA offset manager. Return the start address of the given node. Note that this can only be used for page-based addressing.

Start address of node for page-based addressing. Return the size as number of pages for the given node. If no offset is allocated for the node, this is 0. Size of node as number of pages.

This must not be called on unlinked nodes. Offset of node for byte-based addressing. Unmap all userspace mappings for a given offset node. If no offset exists or the address-space is invalid, nothing is done. This call is unlocked. This checks whether filp is granted access to node. Drivers may need to expose additional parameters to applications than those described in the previous sections.

Properties are identified by a name that uniquely defines the property purpose, and store an associated value. For all property types except blob properties the value is a bit unsigned integer. KMS differentiates between properties and property instances. Drivers first create properties and then create and associate individual instances of those properties to objects.

A property can be instantiated multiple times and associated with different objects. Values are stored in property instances, and all other property information are stored in the propery and shared between all instances of the property.

Every property is created with a type that influences how the KMS core handles the property. Supported property types are. Range properties report their minimum and maximum admissible values. The KMS core verifies that values set by application fit in that range.

Enumerated properties take a numerical value that ranges from 0 to the number of enumerated values defined by the property minus one, and associate a free-formed string name to each value.

Applications can retrieve the list of defined value-name pairs and use the numerical value to get and set property instance values. Bitmask properties are enumeration properties that additionally restrict all enumerated values to the Bitmask property instance values combine one or more of the enumerated bits defined by the property.

Blob properties store a binary blob without any format restriction. The binary blobs are created as KMS standalone objects, and blob property instance values store the ID of their associated blob object. Blob properties are only used for the connector EDID property and cannot be created by drivers. To create a property drivers call one of the following functions depending on the property type.

All property creation functions take property flags and name, as well as type-specific arguments. Create an enumerated property. Create a bitmask property. Properties can additionally be created as immutable, in which case they will be read-only for applications but can be modified by the driver.

Care must be taken to properly specify the property type through the flags argument. The function takes a pointer to the target object, a pointer to the previously created property and an initial instance value.

Vertical blanking plays a major role in graphics rendering. The DRM core handles most of the vertical blanking management logic, which involves filtering out spurious interrupts, keeping race-free blanking counters, coping with counter wrap-around and resets and keeping use counts.

It relies on the driver to generate vertical blanking interrupts and optionally provide a hardware vertical blanking counter. Drivers must implement the following operations. Retrieve the value of the vertical blanking counter for the given CRTC. If the hardware maintains a vertical blanking counter its value should be returned. The reason behind this is not clear. Vertical blanking interrupts can be enabled by the DRM core or by drivers themselves for instance to handle page flipping operations.

The DRM core maintains a vertical blanking use count to ensure that the interrupts are not disabled while a user still needs them. Upon return vertical blanking interrupts are guaranteed to be enabled. Only when the use count drops to zero will the DRM core disable the vertical blanking interrupts after a delay by scheduling a timer.

Its default value is ms. UMS drivers can implement it to acquire device resources. KMS drivers can't use the method and must acquire resources in the load method instead. Similarly the lastclose method is called when the last application holding a file handle opened on the device closes it, for both UMS and KMS drivers.

Additionally, the method is also called at module unload time or, for hot-pluggable devices, when the device is unplugged. The firstopen and lastclose calls can thus be unbalanced. The open method is called every time the device is opened by an application.

Note that the open method is called before firstopen. The close operation is split into preclose and postclose methods. Drivers must stop and cleanup all per-file operations in the preclose method. For instance pending vertical blanking and page flip events must be cancelled. No per-file operation is allowed on the file handle after returning from the preclose method.

Finally the postclose method is called as the last step of the close operation, right before calling the lastclose method if no other open file handle exists for the device. Drivers that have allocated per-file private data in the open method should free it here. The lastclose method should restore CRTC and plane properties to default value, so that a subsequent open of the device will not inherit state from the previous user. It can also be used to execute delayed power switching state changes, e.

Beyond that KMS drivers should not do any further cleanup. Only legacy UMS drivers might need to clean up device state so that the vga console or an independent fbdev driver could take over. The open , release and ioctl operations are handled by. The read and poll operations provide support for reading DRM events and polling them.

They are implemented by. The memory mapping implementation varies depending on how the driver manages memory. The ioctls descriptors table is indexed by the ioctl number offset from the base value. The first macro is private to the device while the second must be exposed to userspace in a public header. It restricts how the ioctl is allowed to be called. These are called at suspend, hibernate, or resume time, and should perform any state save or restore required by your device across suspend or hibernate states.

Those are legacy suspend and resume methods. This should cover how DMA mapping etc. These functions are deprecated and should not be used. The DRM core exports several interfaces to applications, generally intended to be used through corresponding libdrm wrapper functions. External interfaces include: memory mapping, context management, DMA operations, AGP management, vblank control, fence management, memory management, and output management. Cover generic ioctls and sysfs layout here. We only need high-level info, since man pages should cover the rest.

DRM core provides multiple character-devices for user-space to use. Depending on which device is opened, user-space can perform a different set of operations mainly ioctls. The primary node provides all legacy operations and historically was the only interface used by userspace.

With KMS, the control node was introduced. However, the planned KMS control interface has never been written and so the control node stays unused to date. With the increased use of offscreen renderers and GPGPU applications, clients no longer require running compositors or graphics servers to make use of a GPU. To avoid this step and to grant clients GPU access without authenticating, render nodes were introduced. Render nodes solely serve render clients, that is, no modesetting or privileged ioctls can be issued on render nodes.

Only non-global rendering commands are allowed. If not supported, the primary node must be used for render clients together with the legacy drmAuth authentication procedure. There will be one render node per device. Render nodes are designed to avoid the buffer-leaks, which occur if clients guess the flink names or mmap offsets on the legacy interface. Driver authors must be careful not to allow any privileged ioctls on render nodes. With render nodes, user-space can now control access to the render node via basic file-system access-modes.

Instead, a client can open the render node and is immediately granted GPU access. FLINK from render node to legacy node is not supported. There is no reason to associate render clients with a DRM-Master as they are independent of any graphics server. Besides, they must work without any running master, anyway. Drivers must be able to run without a master object if they support render nodes.

If, on the other hand, a driver requires shared state between clients which is visible to user-space and accessible beyond open-file boundaries, they cannot support render nodes.

This should be called by application level drivers before and after mode setting, since on many devices the vertical blank counter is reset at that time.

Include auto-generated API reference here need to reference it from paragraphs above too. Revision History Revision 1. Table of Contents 1. Introduction 2. Userland interfaces Render nodes VBlank event handling A.

Chapter 1. Chapter 2. DRM Internals. Driver Initialization. Driver Information. Driver Features. Major, Minor and Patchlevel. Name, Description and Date. Driver Load. Note If compatibility is a concern e. IRQ Registration. Managed IRQ Registration.

Manual IRQ Registration. Memory Manager Initialization. Miscellaneous Device Configuration. Memory management. TTM initialization. Warning This section is outdated. Memory allocation and freeing Command execution Aperture management at command execution time. GEM Initialization. GEM Objects Creation. GEM Objects Lifetime. GEM Objects Naming. GEM Objects Mapping. Dumb GEM Objects. Memory Coherency. Command Execution. Mode Setting.

Frame Buffer Creation. Output Polling. KMS Initialization and Cleanup. CRTC Initialization. CRTC Operations. Set Configuration. Page Flipping. The operation is optional. Plane Initialization. Plane Operations. Encoder Initialization. Encoder Operations. Connector Initialization. Connector Operations. Note Unless otherwise state, all operations are mandatory. Connection Status. Output discovery and initialization example. Arguments dev drm device.

Description This function takes all modeset locks, suitable where a more fine-grained scheme isn't yet implemented. Arguments dev device. Arguments dev drm device id id of the mode object type type of the mode object. Description Note that framebuffers cannot be looked up with this functions - since those are reference counted, they need special treatment.