src/graphics/display/drivers/intel-i915/intel-i915-test-interrupts.cc

// Copyright 2020 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.
#include <lib/ddk/driver.h>
#include <lib/mmio-ptr/fake.h>

#include <vector>

#include <zxtest/zxtest.h>

#include "intel-i915.h"
#include "interrupts.h"
#include "src/devices/pci/testing/pci_protocol_fake.h"

namespace {

// Test interrupt initialization with both MSI and Legacy interrupt modes.
TEST(IntelI915Display, InterruptInit) {
  constexpr uint32_t kMinimumRegCount = 0xd0000 / sizeof(uint32_t);
  i915::Controller controller(nullptr);
  std::vector<uint32_t> regs(kMinimumRegCount);
  mmio_buffer_t buffer{.vaddr = FakeMmioPtr(regs.data()),
                       .offset = 0,
                       .size = regs.size() * sizeof(uint32_t),
                       .vmo = ZX_HANDLE_INVALID};

  controller.SetMmioForTesting(ddk::MmioBuffer(buffer));

  pci::FakePciProtocol pci{};
  controller.SetPciForTesting(pci.get_protocol());

  EXPECT_EQ(ZX_ERR_INTERNAL, controller.interrupts()->Init());

  pci.AddLegacyInterrupt();
  EXPECT_EQ(ZX_OK, controller.interrupts()->Init());
  EXPECT_EQ(1, pci.GetIrqCount());
  EXPECT_EQ(PCI_IRQ_MODE_LEGACY, pci.GetIrqMode());

  pci.AddMsiInterrupt();
  EXPECT_EQ(ZX_OK, controller.interrupts()->Init());
  EXPECT_EQ(1, pci.GetIrqCount());
  EXPECT_EQ(PCI_IRQ_MODE_MSI, pci.GetIrqMode());

  // Unset so controller teardown doesn't crash.
  controller.ResetMmioSpaceForTesting();
}

}  // namespace