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powerpc/32: Remove the 'nobats' kernel parameter

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Mapping without BATs doesn't bring any added value to the user.

Remove that option.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/6977314c823cfb728bc0273cea634b41807bfb64.1655202721.git.christophe.leroy@csgroup.eu
This commit is contained in:
Christophe Leroy 2022-06-14 12:32:23 +02:00 committed by Michael Ellerman
parent 92f89ec1b5
commit 1ce844973b
5 changed files with 7 additions and 24 deletions
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3
Documentation/admin-guide/kernel-parameters.txt
View File

@ -3495,9 +3495,6 @@
noautogroup Disable scheduler automatic task group creation.
nobats [PPC] Do not use BATs for mapping kernel lowmem
on "Classic" PPC cores.
nocache [ARM]
nodsp [SH] Disable hardware DSP at boot time.

2
arch/powerpc/mm/book3s32/mmu.c
View File

@ -161,7 +161,7 @@ unsigned long __init mmu_mapin_ram(unsigned long base, unsigned long top)
unsigned long border = (unsigned long)__init_begin - PAGE_OFFSET;
if (debug_pagealloc_enabled_or_kfence() || __map_without_bats) {
if (debug_pagealloc_enabled_or_kfence()) {
pr_debug_once("Read-Write memory mapped without BATs\n");
if (base >= border)
return base;

11
arch/powerpc/mm/init_32.c
View File

@ -69,12 +69,6 @@ EXPORT_SYMBOL(agp_special_page);
void MMU_init(void);
/*
* this tells the system to map all of ram with the segregs
* (i.e. page tables) instead of the bats.
* -- Cort
*/
int __map_without_bats;
int __map_without_ltlbs;
/* max amount of low RAM to map in */
@ -85,11 +79,6 @@ unsigned long __max_low_memory = MAX_LOW_MEM;
*/
static void __init MMU_setup(void)
{
/* Check for nobats option (used in mapin_ram). */
if (strstr(boot_command_line, "nobats")) {
__map_without_bats = 1;
}
if (strstr(boot_command_line, "noltlbs")) {
__map_without_ltlbs = 1;
}

1
arch/powerpc/mm/mmu_decl.h
View File

@ -92,7 +92,6 @@ extern void mapin_ram(void);
extern void setbat(int index, unsigned long virt, phys_addr_t phys,
unsigned int size, pgprot_t prot);
extern int __map_without_bats;
extern unsigned int rtas_data, rtas_size;
struct hash_pte;

8
arch/powerpc/platforms/83xx/misc.c
View File

@ -121,17 +121,15 @@ void __init mpc83xx_setup_pci(void)
void __init mpc83xx_setup_arch(void)
{
if (ppc_md.progress)
ppc_md.progress("mpc83xx_setup_arch()", 0);
if (!__map_without_bats) {
phys_addr_t immrbase = get_immrbase();
int immrsize = IS_ALIGNED(immrbase, SZ_2M) ? SZ_2M : SZ_1M;
unsigned long va = fix_to_virt(FIX_IMMR_BASE);
if (ppc_md.progress)
ppc_md.progress("mpc83xx_setup_arch()", 0);
setbat(-1, va, immrbase, immrsize, PAGE_KERNEL_NCG);
update_bats();
}
}
int machine_check_83xx(struct pt_regs *regs)