+++ /dev/null
-/*
- * ARM64 ACPI Parking Protocol implementation
- *
- * Authors: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
- * Mark Salter <msalter@redhat.com>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License version 2 as
- * published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
- */
-#include <linux/acpi.h>
-#include <linux/types.h>
-
-#include <asm/cpu_ops.h>
-
-struct cpu_mailbox_entry {
- 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;
-}
-
-struct parking_protocol_mailbox {
- __le32 cpu_id;
- __le32 reserved;
- __le64 entry_point;
-};
-
-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;
- __le32 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;
- }
-
- /*
- * 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(secondary_entry), &mailbox->entry_point);
- writel_relaxed(cpu_entry->gic_cpu_id, &mailbox->cpu_id);
-
- arch_send_wakeup_ipi_mask(cpumask_of(cpu));
-
- iounmap(mailbox);
-
- 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;
- __le64 entry_point;
-
- /*
- * 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;
-
- entry_point = readl_relaxed(&mailbox->entry_point);
- /*
- * Check if firmware has cleared the entry_point as expected
- * by the protocol specification.
- */
- WARN_ON(entry_point);
-
- iounmap(mailbox);
-}
-
-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
-};
#include <asm/smp_plat.h>
extern const struct cpu_operations smp_spin_table_ops;
-extern const struct cpu_operations acpi_parking_protocol_ops;
extern const struct cpu_operations cpu_psci_ops;
const struct cpu_operations *cpu_ops[NR_CPUS];
-static const struct cpu_operations *dt_supported_cpu_ops[] __initconst = {
+static const struct cpu_operations *supported_cpu_ops[] __initconst = {
&smp_spin_table_ops,
&cpu_psci_ops,
NULL,
};
-static const struct cpu_operations *acpi_supported_cpu_ops[] __initconst = {
-#ifdef CONFIG_ARM64_ACPI_PARKING_PROTOCOL
- &acpi_parking_protocol_ops,
-#endif
- &cpu_psci_ops,
- NULL,
-};
-
static const struct cpu_operations * __init cpu_get_ops(const char *name)
{
- const struct cpu_operations **ops;
-
- ops = acpi_disabled ? dt_supported_cpu_ops : acpi_supported_cpu_ops;
+ const struct cpu_operations **ops = supported_cpu_ops;
while (*ops) {
if (!strcmp(name, (*ops)->name))
}
} else {
enable_method = acpi_get_enable_method(cpu);
- if (!enable_method) {
- /*
- * In ACPI systems the boot CPU does not require
- * checking the enable method since for some
- * boot protocol (ie parking protocol) it need not
- * be initialized. Don't warn spuriously.
- */
- if (cpu != 0)
- pr_err("Unsupported ACPI enable-method\n");
- }
+ if (!enable_method)
+ pr_err("Unsupported ACPI enable-method\n");
}
return enable_method;
IPI_CPU_STOP,
IPI_TIMER,
IPI_IRQ_WORK,
- IPI_WAKEUP
};
/*
/* map the logical cpu id to cpu MPIDR */
cpu_logical_map(cpu_count) = hwid;
- /*
- * Set-up the ACPI parking protocol cpu entries
- * while initializing the cpu_logical_map to
- * avoid parsing MADT entries multiple times for
- * nothing (ie a valid cpu_logical_map entry should
- * contain a valid parking protocol data set to
- * initialize the cpu if the parking protocol is
- * the only available enable method).
- */
- acpi_set_mailbox_entry(cpu_count, processor);
-
cpu_count++;
}
S(IPI_CPU_STOP, "CPU stop interrupts"),
S(IPI_TIMER, "Timer broadcast interrupts"),
S(IPI_IRQ_WORK, "IRQ work interrupts"),
- S(IPI_WAKEUP, "CPU wake-up interrupts"),
};
static void smp_cross_call(const struct cpumask *target, unsigned int ipinr)
smp_cross_call(cpumask_of(cpu), IPI_CALL_FUNC);
}
-#ifdef CONFIG_ARM64_ACPI_PARKING_PROTOCOL
-void arch_send_wakeup_ipi_mask(const struct cpumask *mask)
-{
- smp_cross_call(mask, IPI_WAKEUP);
-}
-#endif
-
#ifdef CONFIG_IRQ_WORK
void arch_irq_work_raise(void)
{
break;
#endif
-#ifdef CONFIG_ARM64_ACPI_PARKING_PROTOCOL
- case IPI_WAKEUP:
- WARN_ONCE(!acpi_parking_protocol_valid(cpu),
- "CPU%u: Wake-up IPI outside the ACPI parking protocol\n",
- cpu);
- break;
-#endif
-
default:
pr_crit("CPU%u: Unknown IPI message 0x%x\n", cpu, ipinr);
break;
projects / mirror_ubuntu-zesty-kernel.git / commitdiff