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McKenney" , Neeraj Upadhyay , Randy Dunlap , Damien Le Moal , Doug Berger , Florian Fainelli , David Hildenbrand , Zi Yan , Oscar Salvador , Hari Bathini , Kees Cook , - , KOSAKI Motohiro , Mel Gorman , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, linux-mm@kvack.org, iommu@lists.linux.dev Subject: [PATCH 19/21] dt-bindings: reserved-memory: shared-dma-pool: support DMB Date: Tue, 13 Sep 2022 12:55:06 -0700 Message-Id: <20220913195508.3511038-20-opendmb@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20220913195508.3511038-1-opendmb@gmail.com> References: <20220913195508.3511038-1-opendmb@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1663099145; a=rsa-sha256; cv=none; b=0bqLjK38AOVWoA2A5y6zISYRI9zRqJ270hgwdANBqww1bE1y5Q3ZhRFnyo6sjfcuMVlSea snAp37cvtQ5HwGx6dF5tacVk1SUwC9JsNFPVCr4tx+NrDv16gyZlZRnFzGcaWRT3wu9pF3 1/kx+aUKxmkxNhrl18Wm5MRGdnOklns= ARC-Authentication-Results: i=1; imf06.hostedemail.com; dkim=pass header.d=gmail.com header.s=20210112 header.b=YrAFBuuy; dmarc=pass (policy=none) header.from=gmail.com; spf=pass (imf06.hostedemail.com: domain of opendmb@gmail.com designates 209.85.222.177 as permitted sender) smtp.mailfrom=opendmb@gmail.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1663099145; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=Iv6LAHuQtTXeYWyq0DEDKZbOD/1nb3ztqrePD2HtkIE=; b=v0y1Gs+CKbELEmPrXK2tyB9se+7d7cIJchYBIX4te+oWPb6rTXDeN7v5ZhDEH/bMp3EPuD lLNdWWFAn2UMyyTu/OwfYryi/zxEyM2eLiq78H/LscH+kCSAyDSCjXbYAegKPtmo/e3gIb yX7pHNF3/OrI5YKHxbvKKieQPv2A3Bw= X-Stat-Signature: ix5nc3z9pd1nesd4f8ayuyuioysajuix X-Rspamd-Queue-Id: 0FA4518008B X-Rspamd-Server: rspam03 X-Rspam-User: Authentication-Results: imf06.hostedemail.com; dkim=pass header.d=gmail.com header.s=20210112 header.b=YrAFBuuy; dmarc=pass (policy=none) header.from=gmail.com; spf=pass (imf06.hostedemail.com: domain of opendmb@gmail.com designates 209.85.222.177 as permitted sender) smtp.mailfrom=opendmb@gmail.com X-HE-Tag: 1663099144-399686 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: The shared-dmb-pool compatible string creates a Designated Movable Block to contain a shared pool of DMA buffers. Signed-off-by: Doug Berger --- .../bindings/reserved-memory/shared-dma-pool.yaml | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/Documentation/devicetree/bindings/reserved-memory/shared-dma-pool.yaml b/Documentation/devicetree/bindings/reserved-memory/shared-dma-pool.yaml index 618105f079be..85824fe05ac9 100644 --- a/Documentation/devicetree/bindings/reserved-memory/shared-dma-pool.yaml +++ b/Documentation/devicetree/bindings/reserved-memory/shared-dma-pool.yaml @@ -22,6 +22,14 @@ properties: operating system to instantiate the necessary pool management subsystem if necessary. + - const: shared-dmb-pool + description: > + This indicates a shared-dma-pool region that is located within + a Designated Movable Block. The operating system is free to + use unallocated memory for movable allocations in this region. + Devices need to be tolerant of allocation latency to use this + pool. + - const: restricted-dma-pool description: > This indicates a region of memory meant to be used as a pool -- 2.25.1