From patchwork Mon Oct 27 20:12:30 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Laura Abbott X-Patchwork-Id: 5166291 Return-Path: X-Original-To: patchwork-linux-arm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id B058FC11AC for ; Mon, 27 Oct 2014 20:16:38 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 9B25E2017D for ; Mon, 27 Oct 2014 20:16:37 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 674B72012F for ; Mon, 27 Oct 2014 20:16:36 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1Xiqg5-0007Cy-Sh; Mon, 27 Oct 2014 20:14:09 +0000 Received: from smtp.codeaurora.org ([198.145.11.231]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1XiqfJ-0006Ug-6j for linux-arm-kernel@lists.infradead.org; Mon, 27 Oct 2014 20:13:22 +0000 Received: from smtp.codeaurora.org (localhost [127.0.0.1]) by smtp.codeaurora.org (Postfix) with ESMTP id 6285E13F5C9; Mon, 27 Oct 2014 20:12:42 +0000 (UTC) Received: by smtp.codeaurora.org (Postfix, from userid 486) id 552A513F5E2; Mon, 27 Oct 2014 20:12:42 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Spam-Level: X-Spam-Status: No, score=-2.5 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_NONE, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 Received: from linux-kernel-memory-lab-01.qualcomm.com (i-global254.qualcomm.com [199.106.103.254]) (using TLSv1.1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) (Authenticated sender: lauraa@smtp.codeaurora.org) by smtp.codeaurora.org (Postfix) with ESMTPSA id 2408113F5C9; Mon, 27 Oct 2014 20:12:40 +0000 (UTC) From: Laura Abbott To: Will Deacon , Steve Capper , Mark Rutland Subject: [PATCHv4 5/7] arm64: Factor out fixmap initialiation from ioremap Date: Mon, 27 Oct 2014 13:12:30 -0700 Message-Id: <1414440752-9411-6-git-send-email-lauraa@codeaurora.org> X-Mailer: git-send-email 1.8.2.1 In-Reply-To: <1414440752-9411-1-git-send-email-lauraa@codeaurora.org> References: <1414440752-9411-1-git-send-email-lauraa@codeaurora.org> X-Virus-Scanned: ClamAV using ClamSMTP X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20141027_131321_357984_C4A5EEC5 X-CRM114-Status: GOOD ( 17.29 ) X-Spam-Score: -0.6 (/) Cc: Catalin Marinas , Laura Abbott , Kees Cook , linux-arm-kernel@lists.infradead.org X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.18-1 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP The fixmap API was originally added for arm64 for early_ioremap purposes. It can be used for other purposes too so move the initialization from ioremap to somewhere more generic. This makes it obvious where the fixmap is being set up and allows for a cleaner implementation of __set_fixmap. Reviewed-by: Kees Cook Signed-off-by: Laura Abbott Acked-by: Mark Rutland Tested-by: Mark Rutland --- arch/arm64/include/asm/fixmap.h | 7 +-- arch/arm64/kernel/setup.c | 3 +- arch/arm64/mm/ioremap.c | 93 ++-------------------------------------- arch/arm64/mm/mmu.c | 94 +++++++++++++++++++++++++++++++++++++++++ 4 files changed, 103 insertions(+), 94 deletions(-) diff --git a/arch/arm64/include/asm/fixmap.h b/arch/arm64/include/asm/fixmap.h index 5f7bfe6..db26a2f2 100644 --- a/arch/arm64/include/asm/fixmap.h +++ b/arch/arm64/include/asm/fixmap.h @@ -56,10 +56,11 @@ enum fixed_addresses { #define FIXMAP_PAGE_IO __pgprot(PROT_DEVICE_nGnRE) -extern void __early_set_fixmap(enum fixed_addresses idx, - phys_addr_t phys, pgprot_t flags); +void __init early_fixmap_init(void); -#define __set_fixmap __early_set_fixmap +#define __early_set_fixmap __set_fixmap + +extern void __set_fixmap(enum fixed_addresses idx, phys_addr_t phys, pgprot_t prot); #include diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c index 2437196..efc8bc5 100644 --- a/arch/arm64/kernel/setup.c +++ b/arch/arm64/kernel/setup.c @@ -376,7 +376,8 @@ void __init setup_arch(char **cmdline_p) *cmdline_p = boot_command_line; - early_ioremap_init(); + early_fixmap_init(); + early_ioremap_setup(); parse_early_param(); diff --git a/arch/arm64/mm/ioremap.c b/arch/arm64/mm/ioremap.c index fa324bd..cbb99c8 100644 --- a/arch/arm64/mm/ioremap.c +++ b/arch/arm64/mm/ioremap.c @@ -103,97 +103,10 @@ void __iomem *ioremap_cache(phys_addr_t phys_addr, size_t size) } EXPORT_SYMBOL(ioremap_cache); -static pte_t bm_pte[PTRS_PER_PTE] __page_aligned_bss; -#if CONFIG_ARM64_PGTABLE_LEVELS > 2 -static pte_t bm_pmd[PTRS_PER_PMD] __page_aligned_bss; -#endif -#if CONFIG_ARM64_PGTABLE_LEVELS > 3 -static pte_t bm_pud[PTRS_PER_PUD] __page_aligned_bss; -#endif - -static inline pud_t * __init early_ioremap_pud(unsigned long addr) -{ - pgd_t *pgd; - - pgd = pgd_offset_k(addr); - BUG_ON(pgd_none(*pgd) || pgd_bad(*pgd)); - - return pud_offset(pgd, addr); -} - -static inline pmd_t * __init early_ioremap_pmd(unsigned long addr) -{ - pud_t *pud = early_ioremap_pud(addr); - - BUG_ON(pud_none(*pud) || pud_bad(*pud)); - - return pmd_offset(pud, addr); -} - -static inline pte_t * __init early_ioremap_pte(unsigned long addr) -{ - pmd_t *pmd = early_ioremap_pmd(addr); - - BUG_ON(pmd_none(*pmd) || pmd_bad(*pmd)); - - return pte_offset_kernel(pmd, addr); -} - +/* + * Must be called after early_fixmap_init + */ void __init early_ioremap_init(void) { - pgd_t *pgd; - pud_t *pud; - pmd_t *pmd; - unsigned long addr = fix_to_virt(FIX_BTMAP_BEGIN); - - pgd = pgd_offset_k(addr); - pgd_populate(&init_mm, pgd, bm_pud); - pud = pud_offset(pgd, addr); - pud_populate(&init_mm, pud, bm_pmd); - pmd = pmd_offset(pud, addr); - pmd_populate_kernel(&init_mm, pmd, bm_pte); - - /* - * The boot-ioremap range spans multiple pmds, for which - * we are not prepared: - */ - BUILD_BUG_ON((__fix_to_virt(FIX_BTMAP_BEGIN) >> PMD_SHIFT) - != (__fix_to_virt(FIX_BTMAP_END) >> PMD_SHIFT)); - - if (pmd != early_ioremap_pmd(fix_to_virt(FIX_BTMAP_END))) { - WARN_ON(1); - pr_warn("pmd %p != %p\n", - pmd, early_ioremap_pmd(fix_to_virt(FIX_BTMAP_END))); - pr_warn("fix_to_virt(FIX_BTMAP_BEGIN): %08lx\n", - fix_to_virt(FIX_BTMAP_BEGIN)); - pr_warn("fix_to_virt(FIX_BTMAP_END): %08lx\n", - fix_to_virt(FIX_BTMAP_END)); - - pr_warn("FIX_BTMAP_END: %d\n", FIX_BTMAP_END); - pr_warn("FIX_BTMAP_BEGIN: %d\n", - FIX_BTMAP_BEGIN); - } - early_ioremap_setup(); } - -void __init __early_set_fixmap(enum fixed_addresses idx, - phys_addr_t phys, pgprot_t flags) -{ - unsigned long addr = __fix_to_virt(idx); - pte_t *pte; - - if (idx >= __end_of_fixed_addresses) { - BUG(); - return; - } - - pte = early_ioremap_pte(addr); - - if (pgprot_val(flags)) - set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, flags)); - else { - pte_clear(&init_mm, addr, pte); - flush_tlb_kernel_range(addr, addr+PAGE_SIZE); - } -} diff --git a/arch/arm64/mm/mmu.c b/arch/arm64/mm/mmu.c index 6894ef3..e92f633 100644 --- a/arch/arm64/mm/mmu.c +++ b/arch/arm64/mm/mmu.c @@ -28,6 +28,7 @@ #include #include +#include #include #include #include @@ -459,3 +460,96 @@ void vmemmap_free(unsigned long start, unsigned long end) { } #endif /* CONFIG_SPARSEMEM_VMEMMAP */ + +static pte_t bm_pte[PTRS_PER_PTE] __page_aligned_bss; +#if CONFIG_ARM64_PGTABLE_LEVELS > 2 +static pte_t bm_pmd[PTRS_PER_PMD] __page_aligned_bss; +#endif +#if CONFIG_ARM64_PGTABLE_LEVELS > 3 +static pte_t bm_pud[PTRS_PER_PUD] __page_aligned_bss; +#endif + +static inline pud_t * fixmap_pud(unsigned long addr) +{ + pgd_t *pgd = pgd_offset_k(addr); + + BUG_ON(pgd_none(*pgd) || pgd_bad(*pgd)); + + return pud_offset(pgd, addr); +} + +static inline pmd_t * fixmap_pmd(unsigned long addr) +{ + pud_t *pud = fixmap_pud(addr); + + BUG_ON(pud_none(*pud) || pud_bad(*pud)); + + return pmd_offset(pud, addr); +} + +static inline pte_t * fixmap_pte(unsigned long addr) +{ + pmd_t *pmd = fixmap_pmd(addr); + + BUG_ON(pmd_none(*pmd) || pmd_bad(*pmd)); + + return pte_offset_kernel(pmd, addr); +} + +void __init early_fixmap_init(void) +{ + pgd_t *pgd; + pud_t *pud; + pmd_t *pmd; + unsigned long addr = FIXADDR_START; + + pgd = pgd_offset_k(addr); + pgd_populate(&init_mm, pgd, bm_pud); + pud = pud_offset(pgd, addr); + pud_populate(&init_mm, pud, bm_pmd); + pmd = pmd_offset(pud, addr); + pmd_populate_kernel(&init_mm, pmd, bm_pte); + + /* + * The boot-ioremap range spans multiple pmds, for which + * we are not preparted: + */ + BUILD_BUG_ON((__fix_to_virt(FIX_BTMAP_BEGIN) >> PMD_SHIFT) + != (__fix_to_virt(FIX_BTMAP_END) >> PMD_SHIFT)); + + if ((pmd != fixmap_pmd(fix_to_virt(FIX_BTMAP_BEGIN))) + || pmd != fixmap_pmd(fix_to_virt(FIX_BTMAP_END))) { + WARN_ON(1); + pr_warn("pmd %p != %p, %p\n", + pmd, fixmap_pmd(fix_to_virt(FIX_BTMAP_BEGIN)), + fixmap_pmd(fix_to_virt(FIX_BTMAP_END))); + pr_warn("fix_to_virt(FIX_BTMAP_BEGIN): %08lx\n", + fix_to_virt(FIX_BTMAP_BEGIN)); + pr_warn("fix_to_virt(FIX_BTMAP_END): %08lx\n", + fix_to_virt(FIX_BTMAP_END)); + + pr_warn("FIX_BTMAP_END: %d\n", FIX_BTMAP_END); + pr_warn("FIX_BTMAP_BEGIN: %d\n", FIX_BTMAP_BEGIN); + } +} + +void __set_fixmap(enum fixed_addresses idx, + phys_addr_t phys, pgprot_t flags) +{ + unsigned long addr = __fix_to_virt(idx); + pte_t *pte; + + if (idx >= __end_of_fixed_addresses) { + BUG(); + return; + } + + pte = fixmap_pte(addr); + + if (pgprot_val(flags)) { + set_pte(pte, pfn_pte(phys >> PAGE_SHIFT, flags)); + } else { + pte_clear(&init_mm, addr, pte); + flush_tlb_kernel_range(addr, addr+PAGE_SIZE); + } +}