From patchwork Mon Aug 1 14:40:22 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Baoquan He X-Patchwork-Id: 12933836 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id C1C8CC00144 for ; Mon, 1 Aug 2022 14:42:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=hjeKkIOXq2moNq+/05UQbvPXAZ2eFTwBYgtNZGE68lY=; b=Ug7IRo2ME4lQ0N DryctE5Ojdr+xGkdHTUjWCdBA23Smw2TqAJWIvAmeIIrozj3yeyVfY4+qGgxUxdS5yvRLZ3DSdCai p9LG0Ljmn/ugSrLdeavwigacUqIntZzRRkWIjYcoJN3sLaJ9f87iG9l2u/wJCKJWQXw/srVcUV2OX W7h4k594Ex8JisPUyCBhfOkYjvHvIUoTXl/QHXELU2qg+vyl/UGnBemg31+hYKSJKFciWZNGedW7w hZs+SzIDNvBgoyx1wd7PYP/No8POUJ0SDOOMZzMegchJr6k8b7NceErhGKwp/3xbfKn2yxOm3E1Qh Cmek9DmykC528sry0o/A==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1oIWbZ-0078GI-G1; Mon, 01 Aug 2022 14:41:13 +0000 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1oIWbU-0078BV-8E for linux-arm-kernel@lists.infradead.org; Mon, 01 Aug 2022 14:41:09 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1659364867; 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: in-reply-to:in-reply-to:references:references; bh=4t1/0IxJa6CSuWSxZNOTLOA5QGMU9OZhYQRkkYe7p6I=; b=EvoYBXbfKQ43qQhMamAf479uJfTR3VI/d+x7vpf6d75Zps1rImoD1R3Z5YTKE5EtSvmH83 R1uGV/l2tqnTAw78q/cI3lF3dP+77AkV/R9X7natcHZcdJQM+RaOqlSuJBPaxUlAAPqvCs aT9GCf98Vm/7cQGgfN1OyvoxUlTOXwU= Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-526-0zvBQuswOaeEa8TYB4iQBQ-1; Mon, 01 Aug 2022 10:41:03 -0400 X-MC-Unique: 0zvBQuswOaeEa8TYB4iQBQ-1 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.rdu2.redhat.com [10.11.54.7]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id B1CD33C2F761; Mon, 1 Aug 2022 14:41:02 +0000 (UTC) Received: from MiWiFi-R3L-srv.redhat.com (ovpn-12-103.pek2.redhat.com [10.72.12.103]) by smtp.corp.redhat.com (Postfix) with ESMTP id 13F21141510F; Mon, 1 Aug 2022 14:40:51 +0000 (UTC) From: Baoquan He To: linux-kernel@vger.kernel.org Cc: linux-mm@kvack.org, akpm@linux-foundation.org, hch@infradead.org, wangkefeng.wang@huawei.com, linux-arm-kernel@lists.infradead.org, Baoquan He , Vineet Gupta , linux-snps-arc@lists.infradead.org Subject: [PATCH 04/11] arc: mm: Convert to GENERIC_IOREMAP Date: Mon, 1 Aug 2022 22:40:22 +0800 Message-Id: <20220801144029.57829-5-bhe@redhat.com> In-Reply-To: <20220801144029.57829-1-bhe@redhat.com> References: <20220801144029.57829-1-bhe@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.85 on 10.11.54.7 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220801_074108_423331_DF9466DF X-CRM114-Status: GOOD ( 18.38 ) 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: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Add hooks ioremap_allowed() and iounmap_allowed() for arc's special operation when ioremap_prot() and iounmap(). Meanwhile define and implement arc's own ioremap() because arc has some special handling in ioremap() than standard ioremap(). Signed-off-by: Baoquan He Cc: Vineet Gupta Cc: linux-snps-arc@lists.infradead.org --- arch/arc/Kconfig | 1 + arch/arc/include/asm/io.h | 19 +++++++++---- arch/arc/mm/ioremap.c | 60 ++++++--------------------------------- 3 files changed, 24 insertions(+), 56 deletions(-) diff --git a/arch/arc/Kconfig b/arch/arc/Kconfig index 9e3653253ef2..a08d2abfaf61 100644 --- a/arch/arc/Kconfig +++ b/arch/arc/Kconfig @@ -26,6 +26,7 @@ config ARC select GENERIC_PENDING_IRQ if SMP select GENERIC_SCHED_CLOCK select GENERIC_SMP_IDLE_THREAD + select GENERIC_IOREMAP select HAVE_ARCH_KGDB select HAVE_ARCH_TRACEHOOK select HAVE_ARCH_TRANSPARENT_HUGEPAGE if ARC_MMU_V4 diff --git a/arch/arc/include/asm/io.h b/arch/arc/include/asm/io.h index 8f777d6441a5..10d7ed9dfa61 100644 --- a/arch/arc/include/asm/io.h +++ b/arch/arc/include/asm/io.h @@ -20,9 +20,20 @@ #define __iowmb() do { } while (0) #endif -extern void __iomem *ioremap(phys_addr_t paddr, unsigned long size); -extern void __iomem *ioremap_prot(phys_addr_t paddr, unsigned long size, - unsigned long flags); +/* + * I/O memory mapping functions. + */ + +void __iomem * +ioremap_allowed(phys_addr_t *paddr, size_t size, unsigned long *prot_val); +#define ioremap_allowed ioremap_allowed + +int iounmap_allowed(void __iomem *addr); +#define iounmap_allowed iounmap_allowed + +void __iomem *ioremap(phys_addr_t paddr, unsigned long size); +#define ioremap ioremap + static inline void __iomem *ioport_map(unsigned long port, unsigned int nr) { return (void __iomem *)port; @@ -32,8 +43,6 @@ static inline void ioport_unmap(void __iomem *addr) { } -extern void iounmap(const void __iomem *addr); - /* * io{read,write}{16,32}be() macros */ diff --git a/arch/arc/mm/ioremap.c b/arch/arc/mm/ioremap.c index 0ee75aca6e10..7be73e3645da 100644 --- a/arch/arc/mm/ioremap.c +++ b/arch/arc/mm/ioremap.c @@ -25,13 +25,6 @@ static inline bool arc_uncached_addr_space(phys_addr_t paddr) void __iomem *ioremap(phys_addr_t paddr, unsigned long size) { - phys_addr_t end; - - /* Don't allow wraparound or zero size */ - end = paddr + size - 1; - if (!size || (end < paddr)) - return NULL; - /* * If the region is h/w uncached, MMU mapping can be elided as optim * The cast to u32 is fine as this region can only be inside 4GB @@ -44,62 +37,27 @@ void __iomem *ioremap(phys_addr_t paddr, unsigned long size) } EXPORT_SYMBOL(ioremap); -/* - * ioremap with access flags - * Cache semantics wise it is same as ioremap - "forced" uncached. - * However unlike vanilla ioremap which bypasses ARC MMU for addresses in - * ARC hardware uncached region, this one still goes thru the MMU as caller - * might need finer access control (R/W/X) - */ -void __iomem *ioremap_prot(phys_addr_t paddr, unsigned long size, - unsigned long flags) +void __iomem * +ioremap_allowed(phys_addr_t *paddr, size_t size, unsigned long *prot_val) { - unsigned int off; - unsigned long vaddr; - struct vm_struct *area; - phys_addr_t end; - pgprot_t prot = __pgprot(flags); - - /* Don't allow wraparound, zero size */ - end = paddr + size - 1; - if ((!size) || (end < paddr)) - return NULL; + int ret = -EINVAL; /* An early platform driver might end up here */ if (!slab_is_available()) - return NULL; + return IOMEM_ERR_PTR(ret); /* force uncached */ - prot = pgprot_noncached(prot); + *prot_val = pgprot_val(pgprot_noncached(__pgprot(*prot_val))); - /* Mappings have to be page-aligned */ - off = paddr & ~PAGE_MASK; - paddr &= PAGE_MASK_PHYS; - size = PAGE_ALIGN(end + 1) - paddr; + return NULL; - /* - * Ok, go for it.. - */ - area = get_vm_area(size, VM_IOREMAP); - if (!area) - return NULL; - area->phys_addr = paddr; - vaddr = (unsigned long)area->addr; - if (ioremap_page_range(vaddr, vaddr + size, paddr, prot)) { - vunmap((void __force *)vaddr); - return NULL; - } - return (void __iomem *)(off + (char __iomem *)vaddr); } -EXPORT_SYMBOL(ioremap_prot); - -void iounmap(const void __iomem *addr) +int iounmap_allowed(void __iomem *addr) { /* weird double cast to handle phys_addr_t > 32 bits */ if (arc_uncached_addr_space((phys_addr_t)(u32)addr)) - return; + return -EINVAL; - vfree((void *)(PAGE_MASK & (unsigned long __force)addr)); + return 0; } -EXPORT_SYMBOL(iounmap);