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ARM: 9420/1: smp: Fix SMP for xip kernels

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BugLink: https://bugs.launchpad.net/bugs/2101915

[ Upstream commit 9e9b0cf9319b4db143014477b0bc4b39894248f1 ]

Fix the physical address calculation of the following to get smp working
on xip kernels.
- secondary_data needed for secondary cpu bootup.
- secondary_startup address passed through psci.
- identity mapped code region needed for enabling mmu for secondary cpus.

Signed-off-by: Harith George <harith.g@alifsemi.com>
Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Russell King (Oracle) <rmk+kernel@armlinux.org.uk>
Signed-off-by: Sasha Levin <sashal@kernel.org>
Signed-off-by: Koichiro Den <koichiro.den@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>
This commit is contained in:
Harith G
2025-03-11 08:51:19 +09:00
committed by Stefan Bader
parent 3a7327d5d4
commit cfb6bf6017
3 changed files with 18 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files
arch/arm/kernel/head.S
+4
View File
@@ -411,7 +411,11 @@ ENTRY(secondary_startup)
/*
* Use the page tables supplied from __cpu_up.
*/
#ifdef CONFIG_XIP_KERNEL
ldr r3, =(secondary_data + PLAT_PHYS_OFFSET - PAGE_OFFSET)
#else
adr_l r3, secondary_data
#endif
mov_l r12, __secondary_switched
ldrd r4, r5, [r3, #0] @ get secondary_data.pgdir
ARM_BE8(eor r4, r4, r5) @ Swap r5 and r4 in BE:
arch/arm/kernel/psci_smp.c
+7
View File
@@ -45,8 +45,15 @@ extern void secondary_startup(void);
static int psci_boot_secondary(unsigned int cpu, struct task_struct *idle)
{
if (psci_ops.cpu_on)
#ifdef CONFIG_XIP_KERNEL
return psci_ops.cpu_on(cpu_logical_map(cpu),
((phys_addr_t)(&secondary_startup)
- XIP_VIRT_ADDR(CONFIG_XIP_PHYS_ADDR)
+ CONFIG_XIP_PHYS_ADDR));
#else
return psci_ops.cpu_on(cpu_logical_map(cpu),
virt_to_idmap(&secondary_startup));
#endif
return -ENODEV;
}
arch/arm/mm/idmap.c
+7
View File
@@ -84,8 +84,15 @@ static void identity_mapping_add(pgd_t *pgd, const char *text_start,
unsigned long addr, end;
unsigned long next;
#ifdef CONFIG_XIP_KERNEL
addr = (phys_addr_t)(text_start) - XIP_VIRT_ADDR(CONFIG_XIP_PHYS_ADDR)
+ CONFIG_XIP_PHYS_ADDR;
end = (phys_addr_t)(text_end) - XIP_VIRT_ADDR(CONFIG_XIP_PHYS_ADDR)
+ CONFIG_XIP_PHYS_ADDR;
#else
addr = virt_to_idmap(text_start);
end = virt_to_idmap(text_end);
#endif
pr_info("Setting up static identity map for 0x%lx - 0x%lx\n", addr, end);
prot |= PMD_TYPE_SECT | PMD_SECT_AP_WRITE | PMD_SECT_AF;