From patchwork Fri Feb 14 22:43:22 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Rob Herring X-Patchwork-Id: 1238367 Return-Path: X-Original-To: incoming-dt@patchwork.ozlabs.org Delivered-To: patchwork-incoming-dt@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=none (no SPF record) smtp.mailfrom=vger.kernel.org (client-ip=209.132.180.67; helo=vger.kernel.org; envelope-from=devicetree-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=fail (p=none dis=none) header.from=kernel.org Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by ozlabs.org (Postfix) with ESMTP id 48K7hc0F96z9sPk for ; Sat, 15 Feb 2020 09:43:44 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727964AbgBNWnf (ORCPT ); Fri, 14 Feb 2020 17:43:35 -0500 Received: from mail-oi1-f195.google.com ([209.85.167.195]:43094 "EHLO mail-oi1-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727951AbgBNWnd (ORCPT ); Fri, 14 Feb 2020 17:43:33 -0500 Received: by mail-oi1-f195.google.com with SMTP id p125so10951895oif.10; Fri, 14 Feb 2020 14:43:32 -0800 (PST) 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=RRK+etse5GdhzRRMSbN0AsTFv8NtL6Mf75PwYVcJU44=; b=ufV4By3kONxEZnyPWsfuV2Gp6foK6U9A7tSQdfSdzAel/6TDFgZw+/8/HBKXxffZd1 VSXS6wlcC5Vy3zpTHZVjrJN9R0R5VcUuErrWkvkORdP1gFCIltpDwTt0FeBF4NKSIm5e jCwbS+hrkea14hx1vctyT1k32qmWR65sRNuP9/oxQwxNDWSaHpD7HVJt71ZH/uZndGfn 7YIpH+TAofUj3kKsjTNErV1o6ZVG8pq4RuHml7rDUybEroKiC1fskapyJvlmWXbj697e oaPjFj6ykMoFCux0u9FDbtjN+0b7skh0K0gx2npo/sHvIqTEfKfGGwLDEPflr32EdaM1 1m9A== X-Gm-Message-State: APjAAAUk4xspchTzZNmxV0SMxD8P/pHscfcMpVtUrTKKHysPGLTjSols 2aZtRNnbRA80nYy5ZAyPNEERqDA= X-Google-Smtp-Source: APXvYqz909Fzl/Mv16+lZxspbsDGyoBiYnJJXHR2kdCOGJNisRMIBPTjbnRMOa+Vuf4buMe01/NvvA== X-Received: by 2002:aca:f0b:: with SMTP id 11mr3564215oip.34.1581720212297; Fri, 14 Feb 2020 14:43:32 -0800 (PST) Received: from xps15.herring.priv (24-155-109-49.dyn.grandenetworks.net. [24.155.109.49]) by smtp.googlemail.com with ESMTPSA id m69sm2453167otc.78.2020.02.14.14.43.31 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 14 Feb 2020 14:43:31 -0800 (PST) From: Rob Herring To: devicetree@vger.kernel.org, Frank Rowand Cc: linux-kernel@vger.kernel.org, Linus Walleij , Robin Murphy , Christoph Hellwig , Arnd Bergmann , Benjamin Herrenschmidt , linuxppc-dev@lists.ozlabs.org, Michael Ellerman , Michal Simek , Paul Mackerras Subject: [PATCH 7/7] of/address: Support multiple 'dma-ranges' entries Date: Fri, 14 Feb 2020 16:43:22 -0600 Message-Id: <20200214224322.20030-8-robh@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200214224322.20030-1-robh@kernel.org> References: <20200214224322.20030-1-robh@kernel.org> MIME-Version: 1.0 Sender: devicetree-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: devicetree@vger.kernel.org Currently, the DMA offset and mask for a device are set based only on the first 'dma-ranges' entry. We should really be using all the entries. The kernel doesn't yet support multiple offsets and sizes, so the best we can do is to find the biggest size for a single offset. The algorithm is copied from acpi_dma_get_range(). If there's different offsets from the first entry, then we warn and continue. It really should be an error, but this will likely break existing DTs. Signed-off-by: Rob Herring --- drivers/of/address.c | 28 ++++++++++++++++++++++++---- 1 file changed, 24 insertions(+), 4 deletions(-) diff --git a/drivers/of/address.c b/drivers/of/address.c index a2c45812a50e..8eea3f6e29a4 100644 --- a/drivers/of/address.c +++ b/drivers/of/address.c @@ -944,6 +944,7 @@ int of_dma_get_range(struct device_node *np, u64 *dma_addr, u64 *paddr, u64 *siz bool found_dma_ranges = false; struct of_range_parser parser; struct of_range range; + u64 dma_start = U64_MAX, dma_end = 0, dma_offset = 0; while (node) { ranges = of_get_property(node, "dma-ranges", &len); @@ -974,14 +975,33 @@ int of_dma_get_range(struct device_node *np, u64 *dma_addr, u64 *paddr, u64 *siz pr_debug("dma_addr(%llx) cpu_addr(%llx) size(%llx)\n", range.bus_addr, range.cpu_addr, range.size); - *dma_addr = range.bus_addr; - *paddr = range.cpu_addr; - *size = range.size; + if (dma_offset && range.cpu_addr - range.bus_addr != dma_offset) { + pr_warn("Can't handle multiple dma-ranges with different offsets on node(%pOF)\n", node); + /* Don't error out as we'd break some existing DTs */ + continue; + } + dma_offset = range.cpu_addr - range.bus_addr; + + /* Take lower and upper limits */ + if (range.bus_addr < dma_start) + dma_start = range.bus_addr; + if (range.bus_addr + range.size > dma_end) + dma_end = range.bus_addr + range.size; + } + if (dma_start >= dma_end) { + ret = -EINVAL; + pr_debug("Invalid DMA ranges configuration on node(%pOF)\n", + node); goto out; } - pr_err("translation of DMA ranges failed on node(%pOF)\n", np); + *dma_addr = dma_start; + *size = dma_end - dma_start; + *paddr = dma_start + dma_offset; + + pr_debug("final: dma_addr(%llx) cpu_addr(%llx) size(%llx)\n", + *dma_addr, *paddr, *size); out: of_node_put(node);