| /* SPDX-License-Identifier: GPL-2.0-or-later */ |
| |
| #include <acpi/acpi_device.h> |
| #include <acpi/acpigen.h> |
| #include <amdblocks/graphics.h> |
| #include <amdblocks/vbios_cache.h> |
| #include <boot/coreboot_tables.h> |
| #include <bootmode.h> |
| #include <bootstate.h> |
| #include <console/console.h> |
| #include <device/device.h> |
| #include <device/pci.h> |
| #include <fmap.h> |
| #include <security/vboot/vbios_cache_hash_tpm.h> |
| #include <soc/intel/common/vbt.h> |
| #include <timestamp.h> |
| |
| static bool vbios_loaded_from_cache = false; |
| static uint8_t vbios_data[VBIOS_CACHE_FMAP_SIZE]; |
| |
| #define ATIF_FUNCTION_VERIFY_INTERFACE 0x0 |
| struct atif_verify_interface_output { |
| uint16_t size; /* Size of this object, including size field */ |
| uint16_t version; |
| uint32_t supported_notifications; |
| uint32_t supported_functions; /* Bit n set if function n+1 supported. */ |
| }; |
| |
| #define ATIF_FUNCTION_QUERY_BRIGHTNESS_TRANSFER_CHARACTERISTICS 0x10 |
| # define ATIF_QBTC_REQUEST_LCD1 0 |
| /* error codes */ |
| # define ATIF_QBTC_ERROR_CODE_SUCCESS 0 |
| # define ATIF_QBTC_ERROR_CODE_FAILURE 1 |
| # define ATIF_QBTC_ERROR_CODE_DEVICE_NOT_SUPPORTED 2 |
| struct atif_brightness_input { |
| uint16_t size; |
| /* ATIF doc indicates this field is a word, but the kernel drivers uses a byte. */ |
| uint8_t requested_display; |
| }; |
| struct atif_brightness_output { |
| uint16_t size; /* Size of this object, including size field. */ |
| uint16_t flags; /* Currently all reserved. */ |
| uint8_t error_code; |
| /* default brightness fields currently ignored by Linux driver. */ |
| uint8_t default_brightness_ac; /* Percentage brightness when connected to AC. */ |
| uint8_t default_brightness_dc; /* Percentage brightness when connected to DC. */ |
| /* The following 2 fields are the only ones honored by Linux driver currently. */ |
| uint8_t min_input_signal_level; /* 0-255 corresponding to 0% */ |
| uint8_t max_input_signal_level; /* 0-255 corresponding to 100% */ |
| /* Array of data points consisting of: |
| * { uint8_t luminance_level; (percent) |
| * uint8_t input_signal_level; (0-255 in value) } |
| * Linux ignores these fields so no support currently. */ |
| uint8_t count_data_points; /* Count of data points. */ |
| }; |
| |
| static void generate_atif(const struct device *dev) |
| { |
| struct atif_verify_interface_output verify_output = { |
| .size = sizeof(verify_output), |
| .version = 1, |
| .supported_functions = |
| BIT(ATIF_FUNCTION_QUERY_BRIGHTNESS_TRANSFER_CHARACTERISTICS - 1), |
| }; |
| struct atif_brightness_output brightness_error = { |
| .size = sizeof(brightness_error), |
| .error_code = ATIF_QBTC_ERROR_CODE_DEVICE_NOT_SUPPORTED, |
| }; |
| struct atif_brightness_output brightness_out = { |
| .size = sizeof(brightness_out), |
| .error_code = ATIF_QBTC_ERROR_CODE_SUCCESS, |
| .min_input_signal_level = 0, |
| .max_input_signal_level = 255, |
| }; |
| |
| /* Scope (\_SB.PCI0.PBRA.IGFX) */ |
| acpigen_write_scope(acpi_device_path(dev)); |
| /* Method (ATIF, 2, NotSerialized) */ |
| acpigen_write_method("ATIF", 2); |
| /* ToInteger (Arg0, Local0) */ |
| acpigen_write_to_integer(ARG0_OP, LOCAL0_OP); |
| |
| /* If ((Local0 == Zero)) */ |
| acpigen_write_if_lequal_op_int(LOCAL0_OP, ATIF_FUNCTION_VERIFY_INTERFACE); |
| /* Return (Buffer (0x0C) { ... } */ |
| acpigen_write_return_byte_buffer((uint8_t *)(void *)&verify_output, |
| sizeof(verify_output)); |
| |
| /* ElseIf ((Local0 == 0x10)) */ |
| acpigen_write_else(); |
| acpigen_write_if_lequal_op_int(LOCAL0_OP, |
| ATIF_FUNCTION_QUERY_BRIGHTNESS_TRANSFER_CHARACTERISTICS); |
| /* CreateByteField (Arg1, 0x02, DISP) */ |
| acpigen_write_create_byte_field(ARG1_OP, |
| offsetof(struct atif_brightness_input, requested_display), "DISP"); |
| /* ToInteger (DISP, Local1) */ |
| acpigen_write_to_integer_from_namestring("DISP", LOCAL1_OP); |
| /* If ((Local1 == Zero)) */ |
| acpigen_write_if_lequal_op_int(LOCAL1_OP, ATIF_QBTC_REQUEST_LCD1); |
| /* Return (Buffer (0x0A) { ... } */ |
| acpigen_write_return_byte_buffer((uint8_t *)(void *)&brightness_out, |
| sizeof(brightness_out)); |
| /* Else */ |
| acpigen_write_else(); |
| /* Return (Buffer (0x0A) */ |
| acpigen_write_return_byte_buffer((uint8_t *)(void *)&brightness_error, |
| sizeof(brightness_error)); |
| acpigen_pop_len(); /* else */ |
| |
| acpigen_pop_len(); /* if (LEqual(Local0, 0x10) */ |
| acpigen_pop_len(); /* else */ |
| |
| acpigen_pop_len(); /* Method */ |
| acpigen_pop_len(); /* Scope */ |
| } |
| |
| static void generate_acp(const struct device *dev) |
| { |
| /* Scope (\_SB.PCI0.IGFX) */ |
| acpigen_write_scope(acpi_device_path(dev)); |
| acpigen_write_device("ACP"); |
| |
| acpigen_write_name_string("_HID", "BOOT0003"); |
| |
| acpigen_pop_len(); /* Device */ |
| acpigen_pop_len(); /* Scope */ |
| } |
| |
| static void graphics_fill_ssdt(const struct device *dev) |
| { |
| acpi_device_write_pci_dev(dev); |
| |
| /* Use the VFCT copy when using GOP */ |
| if (!CONFIG(RUN_FSP_GOP)) |
| pci_rom_ssdt(dev); |
| |
| if (CONFIG(SOC_AMD_COMMON_BLOCK_GRAPHICS_ATIF)) |
| generate_atif(dev); |
| |
| if (CONFIG(SOC_AMD_COMMON_BLOCK_GRAPHICS_ACP)) |
| generate_acp(dev); |
| } |
| |
| static const char *graphics_acpi_name(const struct device *dev) |
| { |
| return "IGFX"; |
| } |
| |
| /* |
| * Even though AMD does not need VBT we still need to implement the |
| * vbt_get() function to not break the build with GOP driver enabled |
| * (see fsps_return_value_handler() in fsp2_0/silicon_init.c |
| */ |
| void *vbt_get(void) |
| { |
| return NULL; |
| } |
| |
| static void graphics_set_resources(struct device *const dev) |
| { |
| struct rom_header *rom, *ram; |
| |
| pci_dev_set_resources(dev); |
| |
| if (!CONFIG(RUN_FSP_GOP)) |
| return; |
| |
| timestamp_add_now(TS_OPROM_INITIALIZE); |
| if (CONFIG(USE_SELECTIVE_GOP_INIT) && vbios_cache_is_valid() && |
| !display_init_required()) { |
| vbios_load_from_cache(); |
| timestamp_add_now(TS_OPROM_COPY_END); |
| return; |
| } |
| rom = pci_rom_probe(dev); |
| if (rom == NULL) { |
| printk(BIOS_ERR, "%s: Unable to find ROM for %s\n", |
| __func__, dev_path(dev)); |
| timestamp_add_now(TS_OPROM_COPY_END); |
| return; |
| } |
| |
| ram = pci_rom_load(dev, rom); |
| if (ram == NULL) { |
| printk(BIOS_ERR, "%s: Unable to load ROM for %s\n", |
| __func__, dev_path(dev)); |
| } |
| |
| pci_rom_free(rom); |
| |
| timestamp_add_now(TS_OPROM_COPY_END); |
| } |
| |
| static void graphics_dev_init(struct device *const dev) |
| { |
| if (CONFIG(RUN_FSP_GOP)) |
| fsp_graphics_init(dev); |
| |
| /* Initialize PCI device, load/execute BIOS Option ROM */ |
| pci_dev_init(dev); |
| } |
| |
| static void read_vbios_cache_from_fmap(void *unused) |
| { |
| struct region_device rw_vbios_cache; |
| int32_t region_size; |
| |
| if (!CONFIG(SOC_AMD_GFX_CACHE_VBIOS_IN_FMAP)) |
| return; |
| |
| if (fmap_locate_area_as_rdev(VBIOS_CACHE_FMAP_NAME, &rw_vbios_cache)) { |
| printk(BIOS_ERR, "%s: No %s FMAP section.\n", __func__, VBIOS_CACHE_FMAP_NAME); |
| return; |
| } |
| |
| region_size = region_device_sz(&rw_vbios_cache); |
| |
| if (region_size != VBIOS_CACHE_FMAP_SIZE) { |
| printk(BIOS_ERR, "%s: %s FMAP size mismatch for VBIOS cache (%d vs %d).\n", |
| __func__, VBIOS_CACHE_FMAP_NAME, VBIOS_CACHE_FMAP_SIZE, region_size); |
| return; |
| } |
| |
| /* Read cached VBIOS data into buffer */ |
| if (rdev_readat(&rw_vbios_cache, &vbios_data, 0, VBIOS_CACHE_FMAP_SIZE) != VBIOS_CACHE_FMAP_SIZE) { |
| printk(BIOS_ERR, "Failed to read vbios data from flash; rdev_readat() failed.\n"); |
| return; |
| } |
| |
| printk(BIOS_SPEW, "VBIOS cache successfully read from FMAP.\n"); |
| } |
| |
| static void write_vbios_cache_to_fmap(void *unused) |
| { |
| if (!CONFIG(SOC_AMD_GFX_CACHE_VBIOS_IN_FMAP)) |
| return; |
| |
| /* Don't save if VBIOS loaded from cache / data unchanged */ |
| if (vbios_loaded_from_cache == true) { |
| printk(BIOS_SPEW, "VBIOS data loaded from cache; not saving\n"); |
| return; |
| } |
| |
| struct region_device rw_vbios_cache; |
| |
| if (fmap_locate_area_as_rdev_rw(VBIOS_CACHE_FMAP_NAME, &rw_vbios_cache)) { |
| printk(BIOS_ERR, "%s: No %s FMAP section.\n", __func__, VBIOS_CACHE_FMAP_NAME); |
| return; |
| } |
| |
| /* copy from PCI_VGA_RAM_IMAGE_START to rdev */ |
| if (rdev_writeat(&rw_vbios_cache, (void *)PCI_VGA_RAM_IMAGE_START, 0, |
| VBIOS_CACHE_FMAP_SIZE) != VBIOS_CACHE_FMAP_SIZE) |
| printk(BIOS_ERR, "Failed to save vbios data to flash; rdev_writeat() failed.\n"); |
| |
| /* copy modified vbios data from PCI_VGA_RAM_IMAGE_START to buffer before hashing */ |
| memcpy(vbios_data, (void *)PCI_VGA_RAM_IMAGE_START, VBIOS_CACHE_FMAP_SIZE); |
| |
| /* save data hash to TPM NVRAM for validation on subsequent boots */ |
| vbios_cache_update_hash(vbios_data, VBIOS_CACHE_FMAP_SIZE); |
| |
| printk(BIOS_SPEW, "VBIOS cache successfully written to FMAP.\n"); |
| } |
| |
| /* |
| * Loads cached VBIOS data into legacy oprom location. |
| * |
| * Assumes user has called vbios_cache_is_valid() and checked for success |
| */ |
| void vbios_load_from_cache(void) |
| { |
| /* copy cached vbios data from buffer to PCI_VGA_RAM_IMAGE_START */ |
| memcpy((void *)PCI_VGA_RAM_IMAGE_START, vbios_data, VBIOS_CACHE_FMAP_SIZE); |
| |
| /* mark cache as used so we know not to write it later */ |
| vbios_loaded_from_cache = true; |
| } |
| |
| /* |
| * Return true if VBIOS cache data is valid |
| * |
| * Compare first 2 bytes of data with known signature |
| * and hash of data with hash stored in TPM NVRAM |
| */ |
| bool vbios_cache_is_valid(void) |
| { |
| bool sig_valid = vbios_data[0] == 0x55 && vbios_data[1] == 0xaa; |
| return sig_valid && vbios_cache_verify_hash(vbios_data, VBIOS_CACHE_FMAP_SIZE) == CB_SUCCESS; |
| } |
| |
| BOOT_STATE_INIT_ENTRY(BS_PRE_DEVICE, BS_ON_EXIT, read_vbios_cache_from_fmap, NULL); |
| BOOT_STATE_INIT_ENTRY(BS_OS_RESUME_CHECK, BS_ON_ENTRY, write_vbios_cache_to_fmap, NULL); |
| |
| const struct device_operations amd_graphics_ops = { |
| .read_resources = pci_dev_read_resources, |
| .set_resources = graphics_set_resources, |
| .enable_resources = pci_dev_enable_resources, |
| .init = graphics_dev_init, |
| .scan_bus = scan_static_bus, |
| .ops_pci = &pci_dev_ops_pci, |
| .write_acpi_tables = pci_rom_write_acpi_tables, |
| .acpi_fill_ssdt = graphics_fill_ssdt, |
| .acpi_name = graphics_acpi_name, |
| }; |