mirror of
https://github.com/torvalds/linux
synced 2024-11-05 18:23:50 +00:00
607289a7cd
With -fsanitize=kcfi, we no longer need function_nocfi() as the compiler won't change function references to point to a jump table. Remove all implementations and uses of the macro. Signed-off-by: Sami Tolvanen <samitolvanen@google.com> Reviewed-by: Kees Cook <keescook@chromium.org> Tested-by: Kees Cook <keescook@chromium.org> Tested-by: Nathan Chancellor <nathan@kernel.org> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org> Tested-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Kees Cook <keescook@chromium.org> Link: https://lore.kernel.org/r/20220908215504.3686827-14-samitolvanen@google.com
132 lines
3.5 KiB
C
132 lines
3.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* ARM64 ACPI Parking Protocol implementation
|
|
*
|
|
* Authors: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
|
|
* Mark Salter <msalter@redhat.com>
|
|
*/
|
|
#include <linux/acpi.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/types.h>
|
|
|
|
#include <asm/cpu_ops.h>
|
|
|
|
struct parking_protocol_mailbox {
|
|
__le32 cpu_id;
|
|
__le32 reserved;
|
|
__le64 entry_point;
|
|
};
|
|
|
|
struct cpu_mailbox_entry {
|
|
struct parking_protocol_mailbox __iomem *mailbox;
|
|
phys_addr_t mailbox_addr;
|
|
u8 version;
|
|
u8 gic_cpu_id;
|
|
};
|
|
|
|
static struct cpu_mailbox_entry cpu_mailbox_entries[NR_CPUS];
|
|
|
|
void __init acpi_set_mailbox_entry(int cpu,
|
|
struct acpi_madt_generic_interrupt *p)
|
|
{
|
|
struct cpu_mailbox_entry *cpu_entry = &cpu_mailbox_entries[cpu];
|
|
|
|
cpu_entry->mailbox_addr = p->parked_address;
|
|
cpu_entry->version = p->parking_version;
|
|
cpu_entry->gic_cpu_id = p->cpu_interface_number;
|
|
}
|
|
|
|
bool acpi_parking_protocol_valid(int cpu)
|
|
{
|
|
struct cpu_mailbox_entry *cpu_entry = &cpu_mailbox_entries[cpu];
|
|
|
|
return cpu_entry->mailbox_addr && cpu_entry->version;
|
|
}
|
|
|
|
static int acpi_parking_protocol_cpu_init(unsigned int cpu)
|
|
{
|
|
pr_debug("%s: ACPI parked addr=%llx\n", __func__,
|
|
cpu_mailbox_entries[cpu].mailbox_addr);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int acpi_parking_protocol_cpu_prepare(unsigned int cpu)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static int acpi_parking_protocol_cpu_boot(unsigned int cpu)
|
|
{
|
|
struct cpu_mailbox_entry *cpu_entry = &cpu_mailbox_entries[cpu];
|
|
struct parking_protocol_mailbox __iomem *mailbox;
|
|
u32 cpu_id;
|
|
|
|
/*
|
|
* Map mailbox memory with attribute device nGnRE (ie ioremap -
|
|
* this deviates from the parking protocol specifications since
|
|
* the mailboxes are required to be mapped nGnRnE; the attribute
|
|
* discrepancy is harmless insofar as the protocol specification
|
|
* is concerned).
|
|
* If the mailbox is mistakenly allocated in the linear mapping
|
|
* by FW ioremap will fail since the mapping will be prevented
|
|
* by the kernel (it clashes with the linear mapping attributes
|
|
* specifications).
|
|
*/
|
|
mailbox = ioremap(cpu_entry->mailbox_addr, sizeof(*mailbox));
|
|
if (!mailbox)
|
|
return -EIO;
|
|
|
|
cpu_id = readl_relaxed(&mailbox->cpu_id);
|
|
/*
|
|
* Check if firmware has set-up the mailbox entry properly
|
|
* before kickstarting the respective cpu.
|
|
*/
|
|
if (cpu_id != ~0U) {
|
|
iounmap(mailbox);
|
|
return -ENXIO;
|
|
}
|
|
|
|
/*
|
|
* stash the mailbox address mapping to use it for further FW
|
|
* checks in the postboot method
|
|
*/
|
|
cpu_entry->mailbox = mailbox;
|
|
|
|
/*
|
|
* We write the entry point and cpu id as LE regardless of the
|
|
* native endianness of the kernel. Therefore, any boot-loaders
|
|
* that read this address need to convert this address to the
|
|
* Boot-Loader's endianness before jumping.
|
|
*/
|
|
writeq_relaxed(__pa_symbol(secondary_entry),
|
|
&mailbox->entry_point);
|
|
writel_relaxed(cpu_entry->gic_cpu_id, &mailbox->cpu_id);
|
|
|
|
arch_send_wakeup_ipi_mask(cpumask_of(cpu));
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void acpi_parking_protocol_cpu_postboot(void)
|
|
{
|
|
int cpu = smp_processor_id();
|
|
struct cpu_mailbox_entry *cpu_entry = &cpu_mailbox_entries[cpu];
|
|
struct parking_protocol_mailbox __iomem *mailbox = cpu_entry->mailbox;
|
|
u64 entry_point;
|
|
|
|
entry_point = readq_relaxed(&mailbox->entry_point);
|
|
/*
|
|
* Check if firmware has cleared the entry_point as expected
|
|
* by the protocol specification.
|
|
*/
|
|
WARN_ON(entry_point);
|
|
}
|
|
|
|
const struct cpu_operations acpi_parking_protocol_ops = {
|
|
.name = "parking-protocol",
|
|
.cpu_init = acpi_parking_protocol_cpu_init,
|
|
.cpu_prepare = acpi_parking_protocol_cpu_prepare,
|
|
.cpu_boot = acpi_parking_protocol_cpu_boot,
|
|
.cpu_postboot = acpi_parking_protocol_cpu_postboot
|
|
};
|