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Sun, 09 May 2021 10:14:44 -0700 (PDT) From: Florian Fainelli To: stable@vger.kernel.org Cc: Ard Biesheuvel , Linus Walleij , Nicolas Pitre , Russell King , Florian Fainelli , Jonathan Corbet , Russell King , Sasha Levin , linux-doc@vger.kernel.org (open list:DOCUMENTATION), linux-kernel@vger.kernel.org (open list), linux-arm-kernel@lists.infradead.org (moderated list:ARM PORT), Greg Kroah-Hartman Subject: [PATCH stable 5.4 1/3] ARM: 9011/1: centralize phys-to-virt conversion of DT/ATAGS address Date: Sun, 9 May 2021 10:14:26 -0700 Message-Id: <20210509171428.1537572-2-f.fainelli@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210509171428.1537572-1-f.fainelli@gmail.com> References: <20210509171428.1537572-1-f.fainelli@gmail.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210509_101446_017831_5D6AB1C5 X-CRM114-Status: GOOD ( 21.74 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: Ard Biesheuvel commit e9a2f8b599d0bc22a1b13e69527246ac39c697b4 upstream Before moving the DT mapping out of the linear region, let's prepare for this change by removing all the phys-to-virt translations of the __atags_pointer variable, and perform this translation only once at setup time. Tested-by: Linus Walleij Reviewed-by: Linus Walleij Acked-by: Nicolas Pitre Signed-off-by: Ard Biesheuvel Signed-off-by: Russell King Signed-off-by: Florian Fainelli --- arch/arm/include/asm/prom.h | 4 ++-- arch/arm/kernel/atags.h | 4 ++-- arch/arm/kernel/atags_parse.c | 6 +++--- arch/arm/kernel/devtree.c | 6 +++--- arch/arm/kernel/setup.c | 14 +++++++++----- arch/arm/mm/mmu.c | 4 ++-- 6 files changed, 21 insertions(+), 17 deletions(-) diff --git a/arch/arm/include/asm/prom.h b/arch/arm/include/asm/prom.h index 1e36c40533c1..402e3f34c7ed 100644 --- a/arch/arm/include/asm/prom.h +++ b/arch/arm/include/asm/prom.h @@ -9,12 +9,12 @@ #ifdef CONFIG_OF -extern const struct machine_desc *setup_machine_fdt(unsigned int dt_phys); +extern const struct machine_desc *setup_machine_fdt(void *dt_virt); extern void __init arm_dt_init_cpu_maps(void); #else /* CONFIG_OF */ -static inline const struct machine_desc *setup_machine_fdt(unsigned int dt_phys) +static inline const struct machine_desc *setup_machine_fdt(void *dt_virt) { return NULL; } diff --git a/arch/arm/kernel/atags.h b/arch/arm/kernel/atags.h index 067e12edc341..f2819c25b602 100644 --- a/arch/arm/kernel/atags.h +++ b/arch/arm/kernel/atags.h @@ -2,11 +2,11 @@ void convert_to_tag_list(struct tag *tags); #ifdef CONFIG_ATAGS -const struct machine_desc *setup_machine_tags(phys_addr_t __atags_pointer, +const struct machine_desc *setup_machine_tags(void *__atags_vaddr, unsigned int machine_nr); #else static inline const struct machine_desc * __init __noreturn -setup_machine_tags(phys_addr_t __atags_pointer, unsigned int machine_nr) +setup_machine_tags(void *__atags_vaddr, unsigned int machine_nr) { early_print("no ATAGS support: can't continue\n"); while (true); diff --git a/arch/arm/kernel/atags_parse.c b/arch/arm/kernel/atags_parse.c index ce02f92f4ab2..8288151631fc 100644 --- a/arch/arm/kernel/atags_parse.c +++ b/arch/arm/kernel/atags_parse.c @@ -176,7 +176,7 @@ static void __init squash_mem_tags(struct tag *tag) } const struct machine_desc * __init -setup_machine_tags(phys_addr_t __atags_pointer, unsigned int machine_nr) +setup_machine_tags(void *atags_vaddr, unsigned int machine_nr) { struct tag *tags = (struct tag *)&default_tags; const struct machine_desc *mdesc = NULL, *p; @@ -197,8 +197,8 @@ setup_machine_tags(phys_addr_t __atags_pointer, unsigned int machine_nr) if (!mdesc) return NULL; - if (__atags_pointer) - tags = phys_to_virt(__atags_pointer); + if (atags_vaddr) + tags = atags_vaddr; else if (mdesc->atag_offset) tags = (void *)(PAGE_OFFSET + mdesc->atag_offset); diff --git a/arch/arm/kernel/devtree.c b/arch/arm/kernel/devtree.c index 39c978698406..4e09883c276d 100644 --- a/arch/arm/kernel/devtree.c +++ b/arch/arm/kernel/devtree.c @@ -203,12 +203,12 @@ static const void * __init arch_get_next_mach(const char *const **match) /** * setup_machine_fdt - Machine setup when an dtb was passed to the kernel - * @dt_phys: physical address of dt blob + * @dt_virt: virtual address of dt blob * * If a dtb was passed to the kernel in r2, then use it to choose the * correct machine_desc and to setup the system. */ -const struct machine_desc * __init setup_machine_fdt(unsigned int dt_phys) +const struct machine_desc * __init setup_machine_fdt(void *dt_virt) { const struct machine_desc *mdesc, *mdesc_best = NULL; @@ -221,7 +221,7 @@ const struct machine_desc * __init setup_machine_fdt(unsigned int dt_phys) mdesc_best = &__mach_desc_GENERIC_DT; #endif - if (!dt_phys || !early_init_dt_verify(phys_to_virt(dt_phys))) + if (!dt_virt || !early_init_dt_verify(dt_virt)) return NULL; mdesc = of_flat_dt_match_machine(mdesc_best, arch_get_next_mach); diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c index d0a464e317ea..d0cad48ff83b 100644 --- a/arch/arm/kernel/setup.c +++ b/arch/arm/kernel/setup.c @@ -89,6 +89,7 @@ unsigned int cacheid __read_mostly; EXPORT_SYMBOL(cacheid); unsigned int __atags_pointer __initdata; +void *atags_vaddr __initdata; unsigned int system_rev; EXPORT_SYMBOL(system_rev); @@ -1075,19 +1076,22 @@ void __init hyp_mode_check(void) void __init setup_arch(char **cmdline_p) { - const struct machine_desc *mdesc; + const struct machine_desc *mdesc = NULL; + + if (__atags_pointer) + atags_vaddr = phys_to_virt(__atags_pointer); setup_processor(); - mdesc = setup_machine_fdt(__atags_pointer); + if (atags_vaddr) + mdesc = setup_machine_fdt(atags_vaddr); if (!mdesc) - mdesc = setup_machine_tags(__atags_pointer, __machine_arch_type); + mdesc = setup_machine_tags(atags_vaddr, __machine_arch_type); if (!mdesc) { early_print("\nError: invalid dtb and unrecognized/unsupported machine ID\n"); early_print(" r1=0x%08x, r2=0x%08x\n", __machine_arch_type, __atags_pointer); if (__atags_pointer) - early_print(" r2[]=%*ph\n", 16, - phys_to_virt(__atags_pointer)); + early_print(" r2[]=%*ph\n", 16, atags_vaddr); dump_machine_table(); } diff --git a/arch/arm/mm/mmu.c b/arch/arm/mm/mmu.c index 48c2888297dd..e1cd9a05be04 100644 --- a/arch/arm/mm/mmu.c +++ b/arch/arm/mm/mmu.c @@ -1512,7 +1512,7 @@ static void __init map_lowmem(void) } #ifdef CONFIG_ARM_PV_FIXUP -extern unsigned long __atags_pointer; +extern void *atags_vaddr; typedef void pgtables_remap(long long offset, unsigned long pgd, void *bdata); pgtables_remap lpae_pgtables_remap_asm; @@ -1543,7 +1543,7 @@ static void __init early_paging_init(const struct machine_desc *mdesc) */ lpae_pgtables_remap = (pgtables_remap *)(unsigned long)__pa(lpae_pgtables_remap_asm); pa_pgd = __pa(swapper_pg_dir); - boot_data = __va(__atags_pointer); + boot_data = atags_vaddr; barrier(); pr_info("Switching physical address space to 0x%08llx\n", -- 2.25.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel