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bh=AGKKN/OWJOyV6ZqbGmatCEZjrbL+jRdwO702UQOKIeg=; b=fvvrorRY5nXMu1B7mFCxvhur3T0kSxWRXdwSQpLDk++SK9d9txSQuY4AYkZCfb2pgRAIt1 AfLIQMuP+emUgG3L0YPnONIojtcuteXve2jcip5/+bEHTU5vzYCNGkTRXYhw6Ld5aFGH0O hqWeZAEqUDMAc1y7v1xZeeyCPcDQ4I7XugvWgQQr3U6JHobEWPob6InEbqlRqmbNIBXA/0 ZIBqY1+EhQTKK0wFgjCn3PjjDGPT0qoh4bt3wl6MuCFVSYSceN34Wj0VV37LGnvl6rkxRN k97KPR4ik5hY47mGsmigmEqELPwFrqSlIe66h5qlq9Uh3KEd447wcNdk5W/vkQ== DKIM-Signature: v=1; a=ed25519-sha256; c=relaxed/relaxed; d=linutronix.de; s=2020e; t=1604010740; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: references:references; bh=AGKKN/OWJOyV6ZqbGmatCEZjrbL+jRdwO702UQOKIeg=; b=O8AlmHMsCzo7Zmi8ixcO2Lt7JF2PPuvsIr9ufc4XJP7K1yuLIBe/yvZzKNne5DOwOi+Apc 2ellyC9nc5i560Cg== Date: Thu, 29 Oct 2020 23:18:16 +0100 From: Thomas Gleixner To: LKML Subject: [patch V2 10/18] nds32/mm/highmem: Switch to generic kmap atomic References: <20201029221806.189523375@linutronix.de> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201029_183222_443955_F1CD80D0 X-CRM114-Status: GOOD ( 15.32 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Juri Lelli , linux-xtensa@linux-xtensa.org, Peter Zijlstra , Benjamin Herrenschmidt , Sebastian Andrzej Siewior , Ben Segall , linux-mm@kvack.org, Guo Ren , sparclinux@vger.kernel.org, Vincent Chen , Ingo Molnar , linux-arch@vger.kernel.org, Vincent Guittot , Herbert Xu , Michael Ellerman , x86@kernel.org, Russell King , linux-csky@vger.kernel.org, Christoph Hellwig , David Airlie , Mel Gorman , linux-snps-arc@lists.infradead.org, Ard Biesheuvel , Paul McKenney , linuxppc-dev@lists.ozlabs.org, Steven Rostedt , Linus Torvalds , Greentime Hu , Dietmar Eggemann , linux-arm-kernel@lists.infradead.org, Chris Zankel , Michal Simek , Thomas Bogendoerfer , Nick Hu , Max Filippov , Vineet Gupta , linux-mips@vger.kernel.org, Arnd Bergmann , Daniel Vetter , Paul Mackerras , Andrew Morton , Daniel Bristot de Oliveira , "David S. Miller" Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org The mapping code is odd and looks broken. See FIXME in the comment. Signed-off-by: Thomas Gleixner Cc: Nick Hu Cc: Greentime Hu Cc: Vincent Chen diff --git a/arch/nds32/Kconfig.cpu b/arch/nds32/Kconfig.cpu index f88a12fdf0f3..c7add11ea36e 100644 --- a/arch/nds32/Kconfig.cpu +++ b/arch/nds32/Kconfig.cpu @@ -157,6 +157,7 @@ config HW_SUPPORT_UNALIGNMENT_ACCESS config HIGHMEM bool "High Memory Support" depends on MMU && !CPU_CACHE_ALIASING + select KMAP_LOCAL help The address space of Andes processors is only 4 Gigabytes large and it has to accommodate user address space, kernel address diff --git a/arch/nds32/include/asm/highmem.h b/arch/nds32/include/asm/highmem.h index fe986d0e6e3f..d844c282c090 100644 --- a/arch/nds32/include/asm/highmem.h +++ b/arch/nds32/include/asm/highmem.h @@ -45,11 +45,22 @@ extern pte_t *pkmap_page_table; extern void kmap_init(void); /* - * The following functions are already defined by - * when CONFIG_HIGHMEM is not set. + * FIXME: The below looks broken vs. a kmap_atomic() in task context which + * is interupted and another kmap_atomic() happens in interrupt context. + * But what do I know about nds32. -- tglx */ -#ifdef CONFIG_HIGHMEM -extern void *kmap_atomic_pfn(unsigned long pfn); -#endif +#define arch_kmap_local_post_map(vaddr, pteval) \ + do { \ + __nds32__tlbop_inv(vaddr); \ + __nds32__mtsr_dsb(vaddr, NDS32_SR_TLB_VPN); \ + __nds32__tlbop_rwr(pteval); \ + __nds32__isb(); \ + } while (0) + +#define arch_kmap_local_pre_unmap(vaddr, pte) \ + do { \ + __nds32__tlbop_inv(vaddr); \ + __nds32__isb(); \ + } while (0) #endif diff --git a/arch/nds32/mm/Makefile b/arch/nds32/mm/Makefile index 897ecaf5cf54..14fb2e8eb036 100644 --- a/arch/nds32/mm/Makefile +++ b/arch/nds32/mm/Makefile @@ -3,7 +3,6 @@ obj-y := extable.o tlb.o fault.o init.o mmap.o \ mm-nds32.o cacheflush.o proc.o obj-$(CONFIG_ALIGNMENT_TRAP) += alignment.o -obj-$(CONFIG_HIGHMEM) += highmem.o ifdef CONFIG_FUNCTION_TRACER CFLAGS_REMOVE_proc.o = $(CC_FLAGS_FTRACE) diff --git a/arch/nds32/mm/highmem.c b/arch/nds32/mm/highmem.c deleted file mode 100644 index 4284cd59e21a..000000000000 --- a/arch/nds32/mm/highmem.c +++ /dev/null @@ -1,48 +0,0 @@ -// SPDX-License-Identifier: GPL-2.0 -// Copyright (C) 2005-2017 Andes Technology Corporation - -#include -#include -#include -#include -#include -#include -#include -#include - -void *kmap_atomic_high_prot(struct page *page, pgprot_t prot) -{ - unsigned int idx; - unsigned long vaddr, pte; - int type; - pte_t *ptep; - - type = kmap_atomic_idx_push(); - - idx = type + KM_TYPE_NR * smp_processor_id(); - vaddr = __fix_to_virt(FIX_KMAP_BEGIN + idx); - pte = (page_to_pfn(page) << PAGE_SHIFT) | prot; - ptep = pte_offset_kernel(pmd_off_k(vaddr), vaddr); - set_pte(ptep, pte); - - __nds32__tlbop_inv(vaddr); - __nds32__mtsr_dsb(vaddr, NDS32_SR_TLB_VPN); - __nds32__tlbop_rwr(pte); - __nds32__isb(); - return (void *)vaddr; -} -EXPORT_SYMBOL(kmap_atomic_high_prot); - -void kunmap_atomic_high(void *kvaddr) -{ - if (kvaddr >= (void *)FIXADDR_START) { - unsigned long vaddr = (unsigned long)kvaddr; - pte_t *ptep; - kmap_atomic_idx_pop(); - __nds32__tlbop_inv(vaddr); - __nds32__isb(); - ptep = pte_offset_kernel(pmd_off_k(vaddr), vaddr); - set_pte(ptep, 0); - } -} -EXPORT_SYMBOL(kunmap_atomic_high);