| /* SPDX-License-Identifier: GPL-2.0-only */ |
| |
| #include <amdblocks/cpu.h> |
| #include <amdblocks/data_fabric.h> |
| #include <arch/ioapic.h> |
| #include <console/console.h> |
| #include <cpu/amd/mtrr.h> |
| #include <device/device.h> |
| #include <device/pci_ops.h> |
| #include <types.h> |
| |
| void amd_pci_domain_scan_bus(struct device *domain) |
| { |
| uint8_t bus, limit; |
| |
| /* TODO: Systems with more than one PCI root need to read the data fabric registers to |
| see which PCI bus numbers get decoded to which PCI root. */ |
| bus = 0; |
| limit = CONFIG_ECAM_MMCONF_BUS_NUMBER - 1; |
| |
| /* Set bus first number of PCI root */ |
| domain->link_list->secondary = bus; |
| /* subordinate needs to be the same as secondary before pci_domain_scan_bus call. */ |
| domain->link_list->subordinate = bus; |
| |
| pci_domain_scan_bus(domain); |
| |
| /* pci_domain_scan_bus will modify subordinate, so change it back to the maximum |
| bus number decoded to this PCI root for the acpigen_resource_producer_bus_number |
| call to write the correct ACPI code. */ |
| domain->link_list->subordinate = limit; |
| } |
| |
| /* Read the registers and return normalized values */ |
| static void data_fabric_get_mmio_base_size(unsigned int reg, |
| resource_t *mmio_base, resource_t *mmio_limit) |
| { |
| const uint32_t base_reg = data_fabric_broadcast_read32(0, DF_MMIO_BASE(reg)); |
| const uint32_t limit_reg = data_fabric_broadcast_read32(0, DF_MMIO_LIMIT(reg)); |
| /* The raw register values are bits 47..16 of the actual address */ |
| *mmio_base = (resource_t)base_reg << D18F0_MMIO_SHIFT; |
| *mmio_limit = (((resource_t)limit_reg + 1) << D18F0_MMIO_SHIFT) - 1; |
| } |
| |
| static void print_df_mmio_outside_of_cpu_mmio_error(unsigned int reg) |
| { |
| printk(BIOS_WARNING, "DF MMIO register %u outside of CPU MMIO region.\n", reg); |
| } |
| |
| static bool is_mmio_region_valid(unsigned int reg, resource_t mmio_base, resource_t mmio_limit) |
| { |
| if (mmio_base > mmio_limit) { |
| printk(BIOS_WARNING, "DF MMIO register %u's base is above its limit.\n", reg); |
| return false; |
| } |
| if (mmio_base >= 4ULL * GiB) { |
| /* MMIO region above 4GB needs to be above TOP_MEM2 MSR value */ |
| if (mmio_base < get_top_of_mem_above_4gb()) { |
| print_df_mmio_outside_of_cpu_mmio_error(reg); |
| return false; |
| } |
| } else { |
| /* MMIO region below 4GB needs to be above TOP_MEM MSR value */ |
| if (mmio_base < get_top_of_mem_below_4gb()) { |
| print_df_mmio_outside_of_cpu_mmio_error(reg); |
| return false; |
| } |
| /* MMIO region below 4GB mustn't cross the 4GB boundary. */ |
| if (mmio_limit >= 4ULL * GiB) { |
| printk(BIOS_WARNING, "DF MMIO register %u crosses 4GB boundary.\n", |
| reg); |
| return false; |
| } |
| } |
| |
| return true; |
| } |
| |
| static void report_data_fabric_mmio(struct device *domain, unsigned int idx, |
| resource_t mmio_base, resource_t mmio_limit) |
| { |
| struct resource *res; |
| res = new_resource(domain, idx); |
| res->base = mmio_base; |
| res->limit = mmio_limit; |
| res->flags = IORESOURCE_MEM | IORESOURCE_ASSIGNED; |
| } |
| |
| /* Tell the resource allocator about the usable MMIO ranges configured in the data fabric */ |
| static void add_data_fabric_mmio_regions(struct device *domain, unsigned int *idx) |
| { |
| union df_mmio_control ctrl; |
| resource_t mmio_base; |
| resource_t mmio_limit; |
| |
| /* The last 12GB of the usable address space are reserved and can't be used for MMIO */ |
| const resource_t reserved_upper_mmio_base = |
| (1ULL << get_usable_physical_address_bits()) - DF_RESERVED_TOP_12GB_MMIO_SIZE; |
| |
| for (unsigned int i = 0; i < DF_MMIO_REG_SET_COUNT; i++) { |
| ctrl.raw = data_fabric_broadcast_read32(0, DF_MMIO_CONTROL(i)); |
| |
| /* Relevant MMIO regions need to have both reads and writes enabled */ |
| if (!ctrl.we || !ctrl.re) |
| continue; |
| |
| /* Non-posted region contains fixed FCH MMIO devices */ |
| if (ctrl.np) |
| continue; |
| |
| /* TODO: Systems with more than one PCI root need to check to which PCI root |
| the MMIO range gets decoded to. */ |
| |
| data_fabric_get_mmio_base_size(i, &mmio_base, &mmio_limit); |
| |
| if (!is_mmio_region_valid(i, mmio_base, mmio_limit)) |
| continue; |
| |
| /* Make sure to not report a region overlapping with the fixed MMIO resources |
| below 4GB or the reserved MMIO range in the last 12GB of the addressable |
| address range. The code assumes that the fixed MMIO resources below 4GB |
| are between IO_APIC_ADDR and the 4GB boundary. */ |
| if (mmio_base < 4ULL * GiB) { |
| if (mmio_base >= IO_APIC_ADDR) |
| continue; |
| if (mmio_limit >= IO_APIC_ADDR) |
| mmio_limit = IO_APIC_ADDR - 1; |
| } else { |
| if (mmio_base >= reserved_upper_mmio_base) |
| continue; |
| if (mmio_limit >= reserved_upper_mmio_base) |
| mmio_limit = reserved_upper_mmio_base - 1; |
| } |
| |
| report_data_fabric_mmio(domain, (*idx)++, mmio_base, mmio_limit); |
| } |
| } |
| |
| /* Tell the resource allocator about the usable I/O space */ |
| static void add_io_regions(struct device *domain, unsigned int *idx) |
| { |
| struct resource *res; |
| |
| /* TODO: Systems with more than one PCI root need to read the data fabric registers to |
| see which IO ranges get decoded to which PCI root. */ |
| |
| res = new_resource(domain, (*idx)++); |
| res->base = 0; |
| res->limit = 0xffff; |
| res->flags = IORESOURCE_IO | IORESOURCE_ASSIGNED; |
| } |
| |
| void amd_pci_domain_read_resources(struct device *domain) |
| { |
| unsigned int idx = 0; |
| |
| add_io_regions(domain, &idx); |
| |
| add_data_fabric_mmio_regions(domain, &idx); |
| } |