| // Copyright 2017 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 <hw/pci.h> |
| #include <hypervisor/bits.h> |
| #include <hypervisor/pci.h> |
| #include <unittest/unittest.h> |
| |
| /* Test we can read multiple fields in 1 32-bit word. */ |
| static bool read_config_register(void) { |
| BEGIN_TEST; |
| |
| pci_bus_t bus; |
| pci_bus_init(&bus, nullptr); |
| pci_device_t* device = &bus.root_complex; |
| |
| // Access Vendor/Device ID as a single 32bit read. |
| uint32_t value = 0; |
| EXPECT_EQ(pci_device_read(device, PCI_CONFIG_VENDOR_ID, 4, &value), ZX_OK, |
| "Failed to read PCI_CONFIG_VENDOR_ID"); |
| EXPECT_EQ(value, PCI_VENDOR_ID_INTEL | (PCI_DEVICE_ID_INTEL_Q35 << 16), |
| "Unexpected value of PCI_CONFIG_VENDOR_ID"); |
| |
| END_TEST; |
| } |
| |
| /* Verify we can read portions of a 32 bit word, one byte at a time. */ |
| static bool read_config_register_bytewise(void) { |
| BEGIN_TEST; |
| |
| pci_bus_t bus; |
| pci_bus_init(&bus, nullptr); |
| pci_device_t* device = &bus.root_complex; |
| |
| uint32_t expected_device_vendor = PCI_VENDOR_ID_INTEL | (PCI_DEVICE_ID_INTEL_Q35 << 16); |
| for (int i = 0; i < 4; ++i) { |
| uint16_t reg = static_cast<uint16_t>(PCI_CONFIG_VENDOR_ID + i); |
| uint32_t value = 0; |
| EXPECT_EQ(pci_device_read(device, reg, 1, &value), ZX_OK, |
| "Failed to read PCI_CONFIG_VENDOR_ID"); |
| EXPECT_EQ(value, bits_shift(expected_device_vendor, i * 8 + 7, i * 8), |
| "Unexpected value of PCI_CONFIG_VENDOR_ID"); |
| } |
| |
| END_TEST; |
| } |
| |
| /* PCI devices BAR sizes must be a power of 2 and must not support setting any |
| * bits in the BAR that are not size aligned. Software often relies on this to |
| * read the bar size by writing all 1's to the register and reading back the |
| * value. |
| * |
| * This tests that we properly mask the lowest bits so software can compute the |
| * BAR size. |
| */ |
| static bool read_bar_size(void) { |
| BEGIN_TEST; |
| |
| pci_bus_t bus; |
| pci_bus_init(&bus, nullptr); |
| pci_device_t* device = &bus.root_complex; |
| |
| // Set all bits in the BAR register. The device will ignore writes to the |
| // LSBs which we can read out to determine the size. |
| EXPECT_EQ(pci_device_write(device, PCI_CONFIG_BASE_ADDRESSES, 4, UINT32_MAX), ZX_OK, |
| "Failed to write BAR0 to PCI config space"); |
| |
| // Read out BAR and compute size. |
| uint32_t value = 0; |
| EXPECT_EQ(pci_device_read(device, PCI_CONFIG_BASE_ADDRESSES, 4, &value), ZX_OK, |
| "Failed to read BAR0 from PCI config space"); |
| EXPECT_EQ(value & PCI_BAR_IO_TYPE_MASK, PCI_BAR_IO_TYPE_PIO, |
| "Expected PIO bit to be set in BAR"); |
| EXPECT_EQ(~(value & ~PCI_BAR_IO_TYPE_MASK) + 1, pci_bar_size(&device->bar[0]), |
| "Incorrect bar size read from pci device"); |
| |
| END_TEST; |
| } |
| |
| /* Verify stats & cap registers correctly show present capabilities and that |
| * capability data is readable. |
| */ |
| static bool read_cap_basic(void) { |
| BEGIN_TEST; |
| |
| pci_bus_t bus; |
| pci_bus_init(&bus, NULL); |
| pci_device_t* device = &bus.root_complex; |
| |
| // Create and install a simple capability. First two bytes are ignored. |
| uint8_t cap_data[] = {0, 0, 0xf, 0xa}; |
| pci_cap_t cap = { |
| .id = 0x9, |
| .data = cap_data, |
| .len = sizeof(cap_data), |
| }; |
| device->capabilities = ∩ |
| device->num_capabilities = 1; |
| |
| // PCI Local Bus Spec 3.0 Table 6-2: Status Register Bits |
| // |
| // This optional read-only bit indicates whether or not this device |
| // implements the pointer for a New Capabilities linked list at offset 34h. |
| // A value of zero indicates that no New Capabilities linked list is |
| // available. A value of one indicates that the value read at offset 34h is |
| // a pointer in Configuration Space to a linked list of new capabilities. |
| // Refer to Section 6.7 for details on New Capabilities. |
| uint32_t status = 0; |
| EXPECT_EQ(pci_device_read(device, PCI_CONFIG_STATUS, 2, &status), ZX_OK, |
| "Failed to read status register from PCI config space.\n"); |
| EXPECT_TRUE(status & PCI_STATUS_NEW_CAPS, |
| "CAP bit not set in status register with a cap list present.\n"); |
| |
| // Read the cap pointer from config space. Here just verify it points to |
| // some location beyond the pre-defined header. |
| uint32_t cap_ptr = 0; |
| EXPECT_EQ(pci_device_read(device, PCI_CONFIG_CAPABILITIES, 1, &cap_ptr), ZX_OK, |
| "Failed to read CAP pointer from PCI config space.\n"); |
| EXPECT_LT(0x40u, cap_ptr, "CAP pointer does not lie beyond the reserved region.\n"); |
| |
| // Read the capability. This will be the Cap ID, next pointer (0), followed |
| // by data bytes (starting at index 2). |
| uint32_t cap_value = 0; |
| EXPECT_EQ(pci_device_read(device, static_cast<uint16_t>(cap_ptr), 4, &cap_value), ZX_OK, |
| "Failed to read CAP value from PCI config space.\n"); |
| EXPECT_EQ(0x0a0f0009u, cap_value, |
| "Incorrect CAP value read from PCI config space.\n"); |
| |
| END_TEST; |
| } |
| |
| /* Build a list of capabilities with no data (only the required ID/next |
| * fields). Verify the next pointers are correctly wired up to traverse |
| * the linked list. |
| */ |
| static bool read_cap_chained(void) { |
| BEGIN_TEST; |
| |
| pci_bus_t bus; |
| pci_bus_init(&bus, NULL); |
| pci_device_t* device = &bus.root_complex; |
| |
| // Build list of caps. |
| pci_cap_t caps[5]; |
| size_t num_caps = sizeof(caps)/sizeof(caps[0]); |
| for (uint8_t i = 0; i < num_caps; ++i) { |
| caps[i].id = i; |
| caps[i].len = 2; |
| } |
| device->capabilities = caps; |
| device->num_capabilities = num_caps; |
| |
| uint32_t cap_ptr = 0; |
| uint32_t cap_header; |
| EXPECT_EQ(pci_device_read(device, PCI_CONFIG_CAPABILITIES, 1, &cap_ptr), ZX_OK, |
| "Failed to read CAP pointer from PCI config space.\n"); |
| for (uint8_t i = 0; i < num_caps; ++i) { |
| // Read the current capability. |
| EXPECT_EQ(pci_device_read(device, static_cast<uint16_t>(cap_ptr), 4, &cap_header), ZX_OK, |
| "Failed to read CAP from PCI config space.\n"); |
| // ID is the first byte. |
| EXPECT_EQ(i, cap_header & UINT8_MAX, "Incorrect CAP ID read.\n"); |
| // Next pointer is the second byte. |
| cap_ptr = cap_header >> 8; |
| } |
| EXPECT_EQ(0u, cap_ptr, "Failed to read CAP pointer from PCI config space.\n"); |
| |
| END_TEST; |
| } |
| |
| BEGIN_TEST_CASE(pci) |
| RUN_TEST(read_config_register) |
| RUN_TEST(read_config_register_bytewise) |
| RUN_TEST(read_bar_size) |
| RUN_TEST(read_cap_basic) |
| RUN_TEST(read_cap_chained) |
| END_TEST_CASE(pci) |