From patchwork Tue Feb 22 15:35:12 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Christoph Hellwig X-Patchwork-Id: 12755440 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 26203C4332F for ; Tue, 22 Feb 2022 15:36:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233627AbiBVPhH (ORCPT ); Tue, 22 Feb 2022 10:37:07 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43894 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233562AbiBVPgr (ORCPT ); Tue, 22 Feb 2022 10:36:47 -0500 Received: from bombadil.infradead.org (bombadil.infradead.org [IPv6:2607:7c80:54:e::133]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id E89931662CF; Tue, 22 Feb 2022 07:36:02 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender :Reply-To:Content-Type:Content-ID:Content-Description; bh=e5WrycmUWO29UJfUDorb7NMshMB8lzYVa/Mc+LVTrQY=; b=PVO9XcrDHa5m2ERE3jOCfMddZ8 VgqNwjEPjMv/voqlXJPqq/Gijq6BadY/wUGg+lCdJIiS/Wm20KPvFL/fb3JaVsj9SgXTgKj/msBMc AUtnTN2/CsgeN7vGXwogaFALjfmJg6+5bVutlBng3wk3Vm1xTJf0dqCzaQiQ16e0PpRZ1TpwNrAb2 Tbp9EBwVd/VQ5Bd719hErc8P9S8oE+PJN5a/LNV1F+lMJfD+HOKEg7jdT+jvqNbzCNX5haPiRafDS zkkrMaLQIzYbe/DL4RXwKjXZ7XEjARtDiWibLpsbJPdcqWJ1NV9wVAKal56Wpmncbpzif8mdAuBMT wzYHLs2Q==; Received: from [2001:4bb8:198:f8fc:c22a:ebfc:be8d:63c2] (helo=localhost) by bombadil.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1nMXCY-00AH3K-TD; Tue, 22 Feb 2022 15:35:43 +0000 From: Christoph Hellwig To: iommu@lists.linux-foundation.org Cc: x86@kernel.org, Stefano Stabellini , Boris Ostrovsky , Juergen Gross , Joerg Roedel , David Woodhouse , Lu Baolu , Robin Murphy , linux-arm-kernel@lists.infradead.org, xen-devel@lists.xenproject.org, linux-ia64@vger.kernel.org, linux-mips@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-hyperv@vger.kernel.org, tboot-devel@lists.sourceforge.net, linux-pci@vger.kernel.org Subject: [PATCH 09/11] swiotlb: add a SWIOTLB_ANY flag to lift the low memory restriction Date: Tue, 22 Feb 2022 16:35:12 +0100 Message-Id: <20220222153514.593231-10-hch@lst.de> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220222153514.593231-1-hch@lst.de> References: <20220222153514.593231-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Power SVM wants to allocate a swiotlb buffer that is not restricted to low memory for the trusted hypervisor scheme. Consolidate the support for this into the swiotlb_init interface by adding a new flag. Signed-off-by: Christoph Hellwig --- arch/powerpc/include/asm/svm.h | 4 ---- arch/powerpc/mm/mem.c | 5 +---- arch/powerpc/platforms/pseries/svm.c | 26 +------------------------- include/linux/swiotlb.h | 1 + kernel/dma/swiotlb.c | 9 +++++++-- 5 files changed, 10 insertions(+), 35 deletions(-) diff --git a/arch/powerpc/include/asm/svm.h b/arch/powerpc/include/asm/svm.h index 7546402d796af..85580b30aba48 100644 --- a/arch/powerpc/include/asm/svm.h +++ b/arch/powerpc/include/asm/svm.h @@ -15,8 +15,6 @@ static inline bool is_secure_guest(void) return mfmsr() & MSR_S; } -void __init svm_swiotlb_init(void); - void dtl_cache_ctor(void *addr); #define get_dtl_cache_ctor() (is_secure_guest() ? dtl_cache_ctor : NULL) @@ -27,8 +25,6 @@ static inline bool is_secure_guest(void) return false; } -static inline void svm_swiotlb_init(void) {} - #define get_dtl_cache_ctor() NULL #endif /* CONFIG_PPC_SVM */ diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c index d99b8b5b40ca6..a4d65418c30a9 100644 --- a/arch/powerpc/mm/mem.c +++ b/arch/powerpc/mm/mem.c @@ -249,10 +249,7 @@ void __init mem_init(void) * back to to-down. */ memblock_set_bottom_up(true); - if (is_secure_guest()) - svm_swiotlb_init(); - else - swiotlb_init(ppc_swiotlb_enable, ppc_swiotlb_flags); + swiotlb_init(ppc_swiotlb_enable, ppc_swiotlb_flags); #endif high_memory = (void *) __va(max_low_pfn * PAGE_SIZE); diff --git a/arch/powerpc/platforms/pseries/svm.c b/arch/powerpc/platforms/pseries/svm.c index c5228f4969eb2..3b4045d508ec8 100644 --- a/arch/powerpc/platforms/pseries/svm.c +++ b/arch/powerpc/platforms/pseries/svm.c @@ -28,7 +28,7 @@ static int __init init_svm(void) * need to use the SWIOTLB buffer for DMA even if dma_capable() says * otherwise. */ - swiotlb_force = SWIOTLB_FORCE; + ppc_swiotlb_flags |= SWIOTLB_ANY | SWIOTLB_FORCE; /* Share the SWIOTLB buffer with the host. */ swiotlb_update_mem_attributes(); @@ -37,30 +37,6 @@ static int __init init_svm(void) } machine_early_initcall(pseries, init_svm); -/* - * Initialize SWIOTLB. Essentially the same as swiotlb_init(), except that it - * can allocate the buffer anywhere in memory. Since the hypervisor doesn't have - * any addressing limitation, we don't need to allocate it in low addresses. - */ -void __init svm_swiotlb_init(void) -{ - unsigned char *vstart; - unsigned long bytes, io_tlb_nslabs; - - io_tlb_nslabs = (swiotlb_size_or_default() >> IO_TLB_SHIFT); - io_tlb_nslabs = ALIGN(io_tlb_nslabs, IO_TLB_SEGSIZE); - - bytes = io_tlb_nslabs << IO_TLB_SHIFT; - - vstart = memblock_alloc(PAGE_ALIGN(bytes), PAGE_SIZE); - if (vstart && !swiotlb_init_with_tbl(vstart, io_tlb_nslabs, false)) - return; - - - memblock_free(vstart, PAGE_ALIGN(io_tlb_nslabs << IO_TLB_SHIFT)); - panic("SVM: Cannot allocate SWIOTLB buffer"); -} - int set_memory_encrypted(unsigned long addr, int numpages) { if (!cc_platform_has(CC_ATTR_MEM_ENCRYPT)) diff --git a/include/linux/swiotlb.h b/include/linux/swiotlb.h index dcecf953f7997..ee655f2e4d28b 100644 --- a/include/linux/swiotlb.h +++ b/include/linux/swiotlb.h @@ -15,6 +15,7 @@ struct scatterlist; #define SWIOTLB_VERBOSE (1 << 0) /* verbose initialization */ #define SWIOTLB_FORCE (1 << 1) /* force bounce buffering */ +#define SWIOTLB_ANY (1 << 2) /* allow any memory for the buffer */ /* * Maximum allowable number of contiguous slabs to map, diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c index ad604e5a0983d..ec200e40fc397 100644 --- a/kernel/dma/swiotlb.c +++ b/kernel/dma/swiotlb.c @@ -275,8 +275,13 @@ void __init swiotlb_init(bool addressing_limit, unsigned int flags) if (swiotlb_force_disable) return; - /* Get IO TLB memory from the low pages */ - tlb = memblock_alloc_low(bytes, PAGE_SIZE); + /* + * By default allocate the bonuce buffer memory from low memory. + */ + if (flags & SWIOTLB_ANY) + tlb = memblock_alloc(bytes, PAGE_SIZE); + else + tlb = memblock_alloc_low(bytes, PAGE_SIZE); if (!tlb) goto fail; if (swiotlb_init_with_tbl(tlb, default_nslabs, flags))