system/fidl/ddk/protocols/intel-gpu-core.fidl

// Copyright 2018 The Fuchsia Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

library ddk.protocol.intel_gpu_core;

using zx;

const uint32 IMAGE_TYPE_X_TILED = 1;
const uint32 IMAGE_TYPE_Y_LEGACY_TILED = 2;
const uint32 IMAGE_TYPE_YF_TILED = 3;

[Layout="ddk-callback"]
interface ZxIntelGpuCoreInterrupt {
    1: Callback(uint32 master_interrupt_control) -> ();
};

[Layout="ddk-protocol"]
interface ZxIntelGpuCore {
    /// Reads 16 bits from pci config space; returned in |value_out|.
    1: ReadPciConfig16(uint16 addr) -> (zx.status s, uint16 value);

    /// Maps the given |pci_bar|; address returned in |addr_out|, size in bytes returned in
    /// |size_out|.
    2: MapPciMmio(uint32 pci_bar) -> (zx.status s, vector<void>? buf);

    /// Unmaps the given |pci_bar|.
    3: UnmapPciMmio(uint32 pci_bar) -> (zx.status s);

    /// Returns a bus transaction initiator.
    4: GetPciBti(uint32 index) -> (zx.status s, handle<bti> bti);

    /// Registers the given |callback| to be invoked with parameter |data| when an interrupt occurs
    /// matching |interrupt_mask|.
    5: RegisterInterruptCallback(ZxIntelGpuCoreInterrupt callback,
                                 uint32 interrupt_mask) -> (zx.status s);

    /// Un-registers a previously registered interrupt callback.
    6: UnregisterInterruptCallback() -> (zx.status s);

    /// Returns the size of the GTT (global translation table) in bytes.
    7: GttGetSize() -> (uint64 size);

    /// Allocates a region of the GTT of the given |page_count|, returning the page-aligned virtual
    /// address in |addr_out|.
    8: GttAlloc(uint64 page_count) -> (zx.status s, uint64 addr);

    /// Frees the GTT allocation given by |addr|.
    9: GttFree(uint64 addr) -> (zx.status s);

    /// Clears the page table entries for the GTT allocation given by |addr|.
    10: GttClear(uint64 addr) -> (zx.status s);

    /// Inserts page tables entries for the GTT allocation given by |addr| for the vmo represented by
    /// handle |buffer|, at the given |page_offset| and |page_count|. Takes ownership of |buffer|.
    11: GttInsert(uint64 addr, handle<vmo> buffer, uint64 page_offset,
                  uint64 page_count) -> (zx.status s);
};