From patchwork Mon May 10 09:50:23 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Claire Chang X-Patchwork-Id: 12247359 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-16.6 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9F4AFC433B4 for ; Mon, 10 May 2021 09:52:25 +0000 (UTC) Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 5177E610CC for ; Mon, 10 May 2021 09:52:25 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org 5177E610CC Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=chromium.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=dri-devel-bounces@lists.freedesktop.org Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id B8CDF6E84D; Mon, 10 May 2021 09:52:24 +0000 (UTC) Received: from mail-pl1-x62e.google.com (mail-pl1-x62e.google.com [IPv6:2607:f8b0:4864:20::62e]) by gabe.freedesktop.org (Postfix) with ESMTPS id 099A36E84D for ; Mon, 10 May 2021 09:52:24 +0000 (UTC) Received: by mail-pl1-x62e.google.com with SMTP id t21so8875574plo.2 for ; Mon, 10 May 2021 02:52:24 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=chromium.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=3YaoLVJ/BlS2jGrFuaf+HAqZru6rV2ab/VHFDnxpz5s=; b=I10YUhrVFYEnBb151sjznBCAywSiwwuXX1ra65r+6Dp7kLXlkJTjZj64MC39DrflfN L6B6coAmKhXT3uzYOIMy3hHP2AqrBakoEoGo6H/hyImCZ+Vs9dEj0AdH5ph0QtkKY+Bg SjBGhbtFT0tOcMKvv+2FyMSaO8PoMl7ClMI8s= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=3YaoLVJ/BlS2jGrFuaf+HAqZru6rV2ab/VHFDnxpz5s=; b=SIDGPhNBahlD/K/T//4EdAo6E3my58Nx0akHs/7cX9t3Ozz9yCzjK8IOqfWPNtjWMj qnC+z7JkRFb/fqp+IpNn0wOCmIZ+cwLJakjSlyqfzqx8FhiuH4NcgQRtqCumU3zlx9G2 mrcNonUHIcyIU8CcE5QkTyNHtLU2uZPgcUsnzpeyl5XkVoIjf/aUl7MFqJaOUeZLkfu9 pJDlTjL5X9jN+/TwbqfNY4hHCjQtfUt3T70Ho9ZhmkEG4nmmXh6aVWWDqXVs3K/fkRrV S4YVB/QOWwgDi9aBv+qeZLIESx6KDYJox4u2g7QwBypmm/Vh6Pw5/71+f2FynK/jiicA Dj1g== X-Gm-Message-State: AOAM530Qc6a7+AT/zPf0tV/uU65hv6hGTwFLhYNogGaxBLodxVjLIExO z7+4rXAabrIf/OExpd/67v0SqQ== X-Google-Smtp-Source: ABdhPJyvBg/0ILrSmUeqEzW7Fk7bklgK3teEOUZ3TKSkxe3vq+G4eTcWybVNarpL8KZA9dCjKF/+aQ== X-Received: by 2002:a17:90a:246:: with SMTP id t6mr27381833pje.228.1620640343682; Mon, 10 May 2021 02:52:23 -0700 (PDT) Received: from localhost ([2401:fa00:95:205:a524:abe8:94e3:5601]) by smtp.gmail.com with UTF8SMTPSA id f6sm10227287pfe.74.2021.05.10.02.52.16 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 10 May 2021 02:52:23 -0700 (PDT) From: Claire Chang To: Rob Herring , mpe@ellerman.id.au, Joerg Roedel , Will Deacon , Frank Rowand , Konrad Rzeszutek Wilk , boris.ostrovsky@oracle.com, jgross@suse.com, Christoph Hellwig , Marek Szyprowski Subject: [PATCH v6 12/15] swiotlb: Add restricted DMA alloc/free support. Date: Mon, 10 May 2021 17:50:23 +0800 Message-Id: <20210510095026.3477496-13-tientzu@chromium.org> X-Mailer: git-send-email 2.31.1.607.g51e8a6a459-goog In-Reply-To: <20210510095026.3477496-1-tientzu@chromium.org> References: <20210510095026.3477496-1-tientzu@chromium.org> MIME-Version: 1.0 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: heikki.krogerus@linux.intel.com, thomas.hellstrom@linux.intel.com, peterz@infradead.org, dri-devel@lists.freedesktop.org, chris@chris-wilson.co.uk, grant.likely@arm.com, paulus@samba.org, mingo@kernel.org, jxgao@google.com, sstabellini@kernel.org, Saravana Kannan , xypron.glpk@gmx.de, "Rafael J . Wysocki" , Bartosz Golaszewski , bskeggs@redhat.com, linux-pci@vger.kernel.org, xen-devel@lists.xenproject.org, Thierry Reding , intel-gfx@lists.freedesktop.org, matthew.auld@intel.com, linux-devicetree , airlied@linux.ie, Robin Murphy , Nicolas Boichat , rodrigo.vivi@intel.com, bhelgaas@google.com, tientzu@chromium.org, Dan Williams , Andy Shevchenko , nouveau@lists.freedesktop.org, Greg KH , Randy Dunlap , lkml , tfiga@chromium.org, "list@263.net:IOMMU DRIVERS" , Jim Quinlan , linuxppc-dev@lists.ozlabs.org, bauerman@linux.ibm.com Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Add the functions, swiotlb_{alloc,free} to support the memory allocation from restricted DMA pool. Signed-off-by: Claire Chang --- include/linux/swiotlb.h | 4 ++++ kernel/dma/swiotlb.c | 35 +++++++++++++++++++++++++++++++++-- 2 files changed, 37 insertions(+), 2 deletions(-) diff --git a/include/linux/swiotlb.h b/include/linux/swiotlb.h index 0c5a18d9cf89..e8cf49bd90c5 100644 --- a/include/linux/swiotlb.h +++ b/include/linux/swiotlb.h @@ -134,6 +134,10 @@ unsigned int swiotlb_max_segment(void); size_t swiotlb_max_mapping_size(struct device *dev); bool is_swiotlb_active(struct device *dev); void __init swiotlb_adjust_size(unsigned long size); +#ifdef CONFIG_DMA_RESTRICTED_POOL +struct page *swiotlb_alloc(struct device *dev, size_t size); +bool swiotlb_free(struct device *dev, struct page *page, size_t size); +#endif /* CONFIG_DMA_RESTRICTED_POOL */ #else #define swiotlb_force SWIOTLB_NO_FORCE static inline bool is_swiotlb_buffer(struct device *dev, phys_addr_t paddr) diff --git a/kernel/dma/swiotlb.c b/kernel/dma/swiotlb.c index fa11787e4b95..d99d5f902259 100644 --- a/kernel/dma/swiotlb.c +++ b/kernel/dma/swiotlb.c @@ -457,8 +457,9 @@ static int find_slots(struct device *dev, phys_addr_t orig_addr, index = wrap = wrap_index(mem, ALIGN(mem->index, stride)); do { - if ((slot_addr(tbl_dma_addr, index) & iotlb_align_mask) != - (orig_addr & iotlb_align_mask)) { + if (orig_addr && + (slot_addr(tbl_dma_addr, index) & iotlb_align_mask) != + (orig_addr & iotlb_align_mask)) { index = wrap_index(mem, index + 1); continue; } @@ -701,6 +702,36 @@ late_initcall(swiotlb_create_default_debugfs); #endif #ifdef CONFIG_DMA_RESTRICTED_POOL +struct page *swiotlb_alloc(struct device *dev, size_t size) +{ + struct io_tlb_mem *mem = dev->dma_io_tlb_mem; + phys_addr_t tlb_addr; + int index; + + if (!mem) + return NULL; + + index = find_slots(dev, 0, size); + if (index == -1) + return NULL; + + tlb_addr = slot_addr(mem->start, index); + + return pfn_to_page(PFN_DOWN(tlb_addr)); +} + +bool swiotlb_free(struct device *dev, struct page *page, size_t size) +{ + phys_addr_t tlb_addr = page_to_phys(page); + + if (!is_swiotlb_buffer(dev, tlb_addr)) + return false; + + release_slots(dev, tlb_addr); + + return true; +} + static int rmem_swiotlb_device_init(struct reserved_mem *rmem, struct device *dev) {