efi: Rename arm-init to efi-init common for all arch
arm-init is responsible for setting up efi runtime and doesn't actually do any ARM specific stuff. RISC-V can use the same source code as it is. Rename it to efi-init so that RISC-V can use it. Signed-off-by: Atish Patra <atish.patra@wdc.com> Link: https://lore.kernel.org/r/20200819222425.30721-8-atish.patra@wdc.com Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
This commit is contained in:
Atish Patra
committed by
Ard Biesheuvel
Ard Biesheuvel
parent
6d0fd53618
commit
f30f242fb1
386
drivers/firmware/efi/efi-init.c
Normal file
386
drivers/firmware/efi/efi-init.c
Normal file
@@ -0,0 +1,386 @@
|
||||
// SPDX-License-Identifier: GPL-2.0
|
||||
/*
|
||||
* Extensible Firmware Interface
|
||||
*
|
||||
* Based on Extensible Firmware Interface Specification version 2.4
|
||||
*
|
||||
* Copyright (C) 2013 - 2015 Linaro Ltd.
|
||||
*/
|
||||
|
||||
#define pr_fmt(fmt) "efi: " fmt
|
||||
|
||||
#include <linux/efi.h>
|
||||
#include <linux/fwnode.h>
|
||||
#include <linux/init.h>
|
||||
#include <linux/memblock.h>
|
||||
#include <linux/mm_types.h>
|
||||
#include <linux/of.h>
|
||||
#include <linux/of_address.h>
|
||||
#include <linux/of_fdt.h>
|
||||
#include <linux/platform_device.h>
|
||||
#include <linux/screen_info.h>
|
||||
|
||||
#include <asm/efi.h>
|
||||
|
||||
static int __init is_memory(efi_memory_desc_t *md)
|
||||
{
|
||||
if (md->attribute & (EFI_MEMORY_WB|EFI_MEMORY_WT|EFI_MEMORY_WC))
|
||||
return 1;
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* Translate a EFI virtual address into a physical address: this is necessary,
|
||||
* as some data members of the EFI system table are virtually remapped after
|
||||
* SetVirtualAddressMap() has been called.
|
||||
*/
|
||||
static phys_addr_t __init efi_to_phys(unsigned long addr)
|
||||
{
|
||||
efi_memory_desc_t *md;
|
||||
|
||||
for_each_efi_memory_desc(md) {
|
||||
if (!(md->attribute & EFI_MEMORY_RUNTIME))
|
||||
continue;
|
||||
if (md->virt_addr == 0)
|
||||
/* no virtual mapping has been installed by the stub */
|
||||
break;
|
||||
if (md->virt_addr <= addr &&
|
||||
(addr - md->virt_addr) < (md->num_pages << EFI_PAGE_SHIFT))
|
||||
return md->phys_addr + addr - md->virt_addr;
|
||||
}
|
||||
return addr;
|
||||
}
|
||||
|
||||
static __initdata unsigned long screen_info_table = EFI_INVALID_TABLE_ADDR;
|
||||
static __initdata unsigned long cpu_state_table = EFI_INVALID_TABLE_ADDR;
|
||||
|
||||
static const efi_config_table_type_t arch_tables[] __initconst = {
|
||||
{LINUX_EFI_ARM_SCREEN_INFO_TABLE_GUID, &screen_info_table},
|
||||
{LINUX_EFI_ARM_CPU_STATE_TABLE_GUID, &cpu_state_table},
|
||||
{}
|
||||
};
|
||||
|
||||
static void __init init_screen_info(void)
|
||||
{
|
||||
struct screen_info *si;
|
||||
|
||||
if (IS_ENABLED(CONFIG_ARM) &&
|
||||
screen_info_table != EFI_INVALID_TABLE_ADDR) {
|
||||
si = early_memremap_ro(screen_info_table, sizeof(*si));
|
||||
if (!si) {
|
||||
pr_err("Could not map screen_info config table\n");
|
||||
return;
|
||||
}
|
||||
screen_info = *si;
|
||||
early_memunmap(si, sizeof(*si));
|
||||
|
||||
/* dummycon on ARM needs non-zero values for columns/lines */
|
||||
screen_info.orig_video_cols = 80;
|
||||
screen_info.orig_video_lines = 25;
|
||||
}
|
||||
|
||||
if (screen_info.orig_video_isVGA == VIDEO_TYPE_EFI &&
|
||||
memblock_is_map_memory(screen_info.lfb_base))
|
||||
memblock_mark_nomap(screen_info.lfb_base, screen_info.lfb_size);
|
||||
}
|
||||
|
||||
static int __init uefi_init(u64 efi_system_table)
|
||||
{
|
||||
efi_config_table_t *config_tables;
|
||||
efi_system_table_t *systab;
|
||||
size_t table_size;
|
||||
int retval;
|
||||
|
||||
systab = early_memremap_ro(efi_system_table, sizeof(efi_system_table_t));
|
||||
if (systab == NULL) {
|
||||
pr_warn("Unable to map EFI system table.\n");
|
||||
return -ENOMEM;
|
||||
}
|
||||
|
||||
set_bit(EFI_BOOT, &efi.flags);
|
||||
if (IS_ENABLED(CONFIG_64BIT))
|
||||
set_bit(EFI_64BIT, &efi.flags);
|
||||
|
||||
retval = efi_systab_check_header(&systab->hdr, 2);
|
||||
if (retval)
|
||||
goto out;
|
||||
|
||||
efi.runtime = systab->runtime;
|
||||
efi.runtime_version = systab->hdr.revision;
|
||||
|
||||
efi_systab_report_header(&systab->hdr, efi_to_phys(systab->fw_vendor));
|
||||
|
||||
table_size = sizeof(efi_config_table_t) * systab->nr_tables;
|
||||
config_tables = early_memremap_ro(efi_to_phys(systab->tables),
|
||||
table_size);
|
||||
if (config_tables == NULL) {
|
||||
pr_warn("Unable to map EFI config table array.\n");
|
||||
retval = -ENOMEM;
|
||||
goto out;
|
||||
}
|
||||
retval = efi_config_parse_tables(config_tables, systab->nr_tables,
|
||||
IS_ENABLED(CONFIG_ARM) ? arch_tables
|
||||
: NULL);
|
||||
|
||||
early_memunmap(config_tables, table_size);
|
||||
out:
|
||||
early_memunmap(systab, sizeof(efi_system_table_t));
|
||||
return retval;
|
||||
}
|
||||
|
||||
/*
|
||||
* Return true for regions that can be used as System RAM.
|
||||
*/
|
||||
static __init int is_usable_memory(efi_memory_desc_t *md)
|
||||
{
|
||||
switch (md->type) {
|
||||
case EFI_LOADER_CODE:
|
||||
case EFI_LOADER_DATA:
|
||||
case EFI_ACPI_RECLAIM_MEMORY:
|
||||
case EFI_BOOT_SERVICES_CODE:
|
||||
case EFI_BOOT_SERVICES_DATA:
|
||||
case EFI_CONVENTIONAL_MEMORY:
|
||||
case EFI_PERSISTENT_MEMORY:
|
||||
/*
|
||||
* Special purpose memory is 'soft reserved', which means it
|
||||
* is set aside initially, but can be hotplugged back in or
|
||||
* be assigned to the dax driver after boot.
|
||||
*/
|
||||
if (efi_soft_reserve_enabled() &&
|
||||
(md->attribute & EFI_MEMORY_SP))
|
||||
return false;
|
||||
|
||||
/*
|
||||
* According to the spec, these regions are no longer reserved
|
||||
* after calling ExitBootServices(). However, we can only use
|
||||
* them as System RAM if they can be mapped writeback cacheable.
|
||||
*/
|
||||
return (md->attribute & EFI_MEMORY_WB);
|
||||
default:
|
||||
break;
|
||||
}
|
||||
return false;
|
||||
}
|
||||
|
||||
static __init void reserve_regions(void)
|
||||
{
|
||||
efi_memory_desc_t *md;
|
||||
u64 paddr, npages, size;
|
||||
|
||||
if (efi_enabled(EFI_DBG))
|
||||
pr_info("Processing EFI memory map:\n");
|
||||
|
||||
/*
|
||||
* Discard memblocks discovered so far: if there are any at this
|
||||
* point, they originate from memory nodes in the DT, and UEFI
|
||||
* uses its own memory map instead.
|
||||
*/
|
||||
memblock_dump_all();
|
||||
memblock_remove(0, PHYS_ADDR_MAX);
|
||||
|
||||
for_each_efi_memory_desc(md) {
|
||||
paddr = md->phys_addr;
|
||||
npages = md->num_pages;
|
||||
|
||||
if (efi_enabled(EFI_DBG)) {
|
||||
char buf[64];
|
||||
|
||||
pr_info(" 0x%012llx-0x%012llx %s\n",
|
||||
paddr, paddr + (npages << EFI_PAGE_SHIFT) - 1,
|
||||
efi_md_typeattr_format(buf, sizeof(buf), md));
|
||||
}
|
||||
|
||||
memrange_efi_to_native(&paddr, &npages);
|
||||
size = npages << PAGE_SHIFT;
|
||||
|
||||
if (is_memory(md)) {
|
||||
early_init_dt_add_memory_arch(paddr, size);
|
||||
|
||||
if (!is_usable_memory(md))
|
||||
memblock_mark_nomap(paddr, size);
|
||||
|
||||
/* keep ACPI reclaim memory intact for kexec etc. */
|
||||
if (md->type == EFI_ACPI_RECLAIM_MEMORY)
|
||||
memblock_reserve(paddr, size);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
void __init efi_init(void)
|
||||
{
|
||||
struct efi_memory_map_data data;
|
||||
u64 efi_system_table;
|
||||
|
||||
/* Grab UEFI information placed in FDT by stub */
|
||||
efi_system_table = efi_get_fdt_params(&data);
|
||||
if (!efi_system_table)
|
||||
return;
|
||||
|
||||
if (efi_memmap_init_early(&data) < 0) {
|
||||
/*
|
||||
* If we are booting via UEFI, the UEFI memory map is the only
|
||||
* description of memory we have, so there is little point in
|
||||
* proceeding if we cannot access it.
|
||||
*/
|
||||
panic("Unable to map EFI memory map.\n");
|
||||
}
|
||||
|
||||
WARN(efi.memmap.desc_version != 1,
|
||||
"Unexpected EFI_MEMORY_DESCRIPTOR version %ld",
|
||||
efi.memmap.desc_version);
|
||||
|
||||
if (uefi_init(efi_system_table) < 0) {
|
||||
efi_memmap_unmap();
|
||||
return;
|
||||
}
|
||||
|
||||
reserve_regions();
|
||||
efi_esrt_init();
|
||||
|
||||
memblock_reserve(data.phys_map & PAGE_MASK,
|
||||
PAGE_ALIGN(data.size + (data.phys_map & ~PAGE_MASK)));
|
||||
|
||||
init_screen_info();
|
||||
|
||||
#ifdef CONFIG_ARM
|
||||
/* ARM does not permit early mappings to persist across paging_init() */
|
||||
efi_memmap_unmap();
|
||||
|
||||
if (cpu_state_table != EFI_INVALID_TABLE_ADDR) {
|
||||
struct efi_arm_entry_state *state;
|
||||
bool dump_state = true;
|
||||
|
||||
state = early_memremap_ro(cpu_state_table,
|
||||
sizeof(struct efi_arm_entry_state));
|
||||
if (state == NULL) {
|
||||
pr_warn("Unable to map CPU entry state table.\n");
|
||||
return;
|
||||
}
|
||||
|
||||
if ((state->sctlr_before_ebs & 1) == 0)
|
||||
pr_warn(FW_BUG "EFI stub was entered with MMU and Dcache disabled, please fix your firmware!\n");
|
||||
else if ((state->sctlr_after_ebs & 1) == 0)
|
||||
pr_warn(FW_BUG "ExitBootServices() returned with MMU and Dcache disabled, please fix your firmware!\n");
|
||||
else
|
||||
dump_state = false;
|
||||
|
||||
if (dump_state || efi_enabled(EFI_DBG)) {
|
||||
pr_info("CPSR at EFI stub entry : 0x%08x\n", state->cpsr_before_ebs);
|
||||
pr_info("SCTLR at EFI stub entry : 0x%08x\n", state->sctlr_before_ebs);
|
||||
pr_info("CPSR after ExitBootServices() : 0x%08x\n", state->cpsr_after_ebs);
|
||||
pr_info("SCTLR after ExitBootServices(): 0x%08x\n", state->sctlr_after_ebs);
|
||||
}
|
||||
early_memunmap(state, sizeof(struct efi_arm_entry_state));
|
||||
}
|
||||
#endif
|
||||
}
|
||||
|
||||
static bool efifb_overlaps_pci_range(const struct of_pci_range *range)
|
||||
{
|
||||
u64 fb_base = screen_info.lfb_base;
|
||||
|
||||
if (screen_info.capabilities & VIDEO_CAPABILITY_64BIT_BASE)
|
||||
fb_base |= (u64)(unsigned long)screen_info.ext_lfb_base << 32;
|
||||
|
||||
return fb_base >= range->cpu_addr &&
|
||||
fb_base < (range->cpu_addr + range->size);
|
||||
}
|
||||
|
||||
static struct device_node *find_pci_overlap_node(void)
|
||||
{
|
||||
struct device_node *np;
|
||||
|
||||
for_each_node_by_type(np, "pci") {
|
||||
struct of_pci_range_parser parser;
|
||||
struct of_pci_range range;
|
||||
int err;
|
||||
|
||||
err = of_pci_range_parser_init(&parser, np);
|
||||
if (err) {
|
||||
pr_warn("of_pci_range_parser_init() failed: %d\n", err);
|
||||
continue;
|
||||
}
|
||||
|
||||
for_each_of_pci_range(&parser, &range)
|
||||
if (efifb_overlaps_pci_range(&range))
|
||||
return np;
|
||||
}
|
||||
return NULL;
|
||||
}
|
||||
|
||||
/*
|
||||
* If the efifb framebuffer is backed by a PCI graphics controller, we have
|
||||
* to ensure that this relation is expressed using a device link when
|
||||
* running in DT mode, or the probe order may be reversed, resulting in a
|
||||
* resource reservation conflict on the memory window that the efifb
|
||||
* framebuffer steals from the PCIe host bridge.
|
||||
*/
|
||||
static int efifb_add_links(const struct fwnode_handle *fwnode,
|
||||
struct device *dev)
|
||||
{
|
||||
struct device_node *sup_np;
|
||||
struct device *sup_dev;
|
||||
|
||||
sup_np = find_pci_overlap_node();
|
||||
|
||||
/*
|
||||
* If there's no PCI graphics controller backing the efifb, we are
|
||||
* done here.
|
||||
*/
|
||||
if (!sup_np)
|
||||
return 0;
|
||||
|
||||
sup_dev = get_dev_from_fwnode(&sup_np->fwnode);
|
||||
of_node_put(sup_np);
|
||||
|
||||
/*
|
||||
* Return -ENODEV if the PCI graphics controller device hasn't been
|
||||
* registered yet. This ensures that efifb isn't allowed to probe
|
||||
* and this function is retried again when new devices are
|
||||
* registered.
|
||||
*/
|
||||
if (!sup_dev)
|
||||
return -ENODEV;
|
||||
|
||||
/*
|
||||
* If this fails, retrying this function at a later point won't
|
||||
* change anything. So, don't return an error after this.
|
||||
*/
|
||||
if (!device_link_add(dev, sup_dev, fw_devlink_get_flags()))
|
||||
dev_warn(dev, "device_link_add() failed\n");
|
||||
|
||||
put_device(sup_dev);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static const struct fwnode_operations efifb_fwnode_ops = {
|
||||
.add_links = efifb_add_links,
|
||||
};
|
||||
|
||||
static struct fwnode_handle efifb_fwnode = {
|
||||
.ops = &efifb_fwnode_ops,
|
||||
};
|
||||
|
||||
static int __init register_gop_device(void)
|
||||
{
|
||||
struct platform_device *pd;
|
||||
int err;
|
||||
|
||||
if (screen_info.orig_video_isVGA != VIDEO_TYPE_EFI)
|
||||
return 0;
|
||||
|
||||
pd = platform_device_alloc("efi-framebuffer", 0);
|
||||
if (!pd)
|
||||
return -ENOMEM;
|
||||
|
||||
if (IS_ENABLED(CONFIG_PCI))
|
||||
pd->dev.fwnode = &efifb_fwnode;
|
||||
|
||||
err = platform_device_add_data(pd, &screen_info, sizeof(screen_info));
|
||||
if (err)
|
||||
return err;
|
||||
|
||||
return platform_device_add(pd);
|
||||
}
|
||||
subsys_initcall(register_gop_device);
|
||||
Reference in New Issue
Block a user