From mboxrd@z Thu Jan 1 00:00:00 1970 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=-9.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED autolearn=unavailable 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 75772C2D0E1 for ; Mon, 14 Sep 2020 23:01:57 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2018B206E9 for ; Mon, 14 Sep 2020 23:01:57 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="LUSSMf80" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1725953AbgINXBy (ORCPT ); Mon, 14 Sep 2020 19:01:54 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:60906 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725997AbgINXBw (ORCPT ); Mon, 14 Sep 2020 19:01:52 -0400 Received: from mail-pj1-x1043.google.com (mail-pj1-x1043.google.com [IPv6:2607:f8b0:4864:20::1043]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 6797AC06178B for ; Mon, 14 Sep 2020 16:01:52 -0700 (PDT) Received: by mail-pj1-x1043.google.com with SMTP id b17so725402pji.1 for ; Mon, 14 Sep 2020 16:01:52 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=date:from:to:cc:subject:message-id:references:mime-version :content-disposition:in-reply-to; bh=pPkLUumppFe6x42FsWC0961zRz5s5453PlO8cy4p4LI=; b=LUSSMf80PeMZgtyxMbetzZ3zhvFKJ4PTV50GecGeb7nz4Z2pTU5JWJjKj2OU/CcPr0 26tlajyo0Jkx8tO/3OmwwlK49jAquG9uXSCa8AEdKgvqYTFmDh1GF5oTuRMAb5qxy2Vv wNsfErSjMV2ZBb3dzb6wgFZ7ZGOrw4RzkuGdE2LolBaT9XOUMVEEkhFMXJQz3gRO9Un5 0/mZaHVWNpl3dpp7ppt6IOC7fA4yv0Cb/19hWWm8xt5wmbiNzJ8RIz2O7el3f2LgQ1yG dIveFfIbZetawB/zyzy6aoJRa0hrTqL4gF+EPypPeXQ7G1HVBit0KAlChFXfSykOCkcL gTuA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:date:from:to:cc:subject:message-id:references :mime-version:content-disposition:in-reply-to; bh=pPkLUumppFe6x42FsWC0961zRz5s5453PlO8cy4p4LI=; b=TEWEOp2bN4o8ozfzHZZgFhQks2JCNS7CrW6q42mh4912xQxOhrkSNDUQWTN0Ef85hJ qUKFEiLSKzMxMZnbCVZN3KMybc4LG4ozWzg5xFQ5dbciv7oTmyeEjKsuemxMRYqOSmbh K/SAnaEdmRHZo0BR4UbpOyvuoYMYK4jvkRky0HYMk5h9TWl1cptqgIPZW6PMor+CZu75 lF7lYoGvtS6qLzYB9/oBsnzz+ZPH0ooXGrxEcZ+cvuJHBP41Qaoo5DLsFqhgwF7Km0vI eScXXw3byGq7R67Df+vAqaigq2XMMt2w/9EhjoWTqpqFamDiE+M7GhfUR9HaDF3Ehh7D f57w== X-Gm-Message-State: AOAM531g72C0klqNuDDGidqwk8znlLYb4p3np1LaEwvzB9iM7JyGwjCL gI4P/xgsQYmS+VhldZ77g+Qlxg== X-Google-Smtp-Source: ABdhPJwft00YkRFeZ2qP3VE+dXsZKmqD72h7JwPvHB/BDCqigxznrWToN+FlbFtAA30AzJj+QvsqDg== X-Received: by 2002:a17:902:b498:: with SMTP id y24mr4724152plr.63.1600124511246; Mon, 14 Sep 2020 16:01:51 -0700 (PDT) Received: from xps15 (S0106002369de4dac.cg.shawcable.net. [68.147.8.254]) by smtp.gmail.com with ESMTPSA id gb19sm10138342pjb.38.2020.09.14.16.01.49 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 14 Sep 2020 16:01:50 -0700 (PDT) Date: Mon, 14 Sep 2020 17:01:47 -0600 From: Mathieu Poirier To: Christoph Hellwig Cc: iommu@lists.linux-foundation.org, Russell King , Santosh Shilimkar , Greg Kroah-Hartman , Jim Quinlan , Nathan Chancellor , Florian Fainelli , Robin Murphy , Rob Herring , Frank Rowand , Ohad Ben-Cohen , Bjorn Andersson , linux-remoteproc@vger.kernel.org, linux-usb@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-sh@vger.kernel.org, linux-pci@vger.kernel.org, linux-acpi@vger.kernel.org, devicetree@vger.kernel.org, arnaud.pouliquen@st.com, loic.pallardy.st.com@xps15 Subject: Re: [PATCH 6/6] dma-mapping: introduce DMA range map, supplanting dma_pfn_offset Message-ID: <20200914230147.GA3251212@xps15> References: <20200914073343.1579578-1-hch@lst.de> <20200914073343.1579578-7-hch@lst.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20200914073343.1579578-7-hch@lst.de> Sender: linux-acpi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org Hi Christoph, On Mon, Sep 14, 2020 at 09:33:43AM +0200, Christoph Hellwig wrote: > From: Jim Quinlan > > The new field 'dma_range_map' in struct device is used to facilitate the > use of single or multiple offsets between mapping regions of cpu addrs and > dma addrs. It subsumes the role of "dev->dma_pfn_offset" which was only > capable of holding a single uniform offset and had no region bounds > checking. > > The function of_dma_get_range() has been modified so that it takes a single > argument -- the device node -- and returns a map, NULL, or an error code. > The map is an array that holds the information regarding the DMA regions. > Each range entry contains the address offset, the cpu_start address, the > dma_start address, and the size of the region. > > of_dma_configure() is the typical manner to set range offsets but there are > a number of ad hoc assignments to "dev->dma_pfn_offset" in the kernel > driver code. These cases now invoke the function > dma_direct_set_offset(dev, cpu_addr, dma_addr, size). > > Signed-off-by: Jim Quinlan > [hch: various interface cleanups] > Signed-off-by: Christoph Hellwig > Tested-by: Nathan Chancellor > --- > arch/arm/include/asm/dma-direct.h | 9 +-- > arch/arm/mach-keystone/keystone.c | 17 ++--- > arch/arm/mach-omap1/include/mach/memory.h | 4 + > arch/sh/drivers/pci/pcie-sh7786.c | 9 ++- > arch/x86/pci/sta2x11-fixup.c | 6 +- > drivers/acpi/arm64/iort.c | 6 +- > drivers/base/core.c | 2 + > drivers/gpu/drm/sun4i/sun4i_backend.c | 8 +- > drivers/iommu/io-pgtable-arm.c | 2 +- > .../platform/sunxi/sun4i-csi/sun4i_csi.c | 9 ++- > .../platform/sunxi/sun6i-csi/sun6i_csi.c | 11 ++- > drivers/of/address.c | 73 ++++++++----------- > drivers/of/device.c | 44 ++++++----- > drivers/of/of_private.h | 11 +-- > drivers/of/unittest.c | 34 ++++++--- > drivers/remoteproc/remoteproc_core.c | 24 +++++- > .../staging/media/sunxi/cedrus/cedrus_hw.c | 10 ++- > include/linux/device.h | 4 +- > include/linux/dma-direct.h | 52 +++++++++++-- > include/linux/dma-mapping.h | 9 ++- > kernel/dma/coherent.c | 7 +- > kernel/dma/direct.c | 51 ++++++++++++- > 22 files changed, 284 insertions(+), 118 deletions(-) > > diff --git a/arch/arm/include/asm/dma-direct.h b/arch/arm/include/asm/dma-direct.h > index fbcf4367b5cb1a..436544aeb83405 100644 > --- a/arch/arm/include/asm/dma-direct.h > +++ b/arch/arm/include/asm/dma-direct.h > @@ -12,8 +12,8 @@ > #ifndef __arch_pfn_to_dma > static inline dma_addr_t pfn_to_dma(struct device *dev, unsigned long pfn) > { > - if (dev) > - pfn -= dev->dma_pfn_offset; > + if (dev && dev->dma_range_map) > + pfn = PFN_DOWN(translate_phys_to_dma(dev, PFN_PHYS(pfn))); > return (dma_addr_t)__pfn_to_bus(pfn); > } > > @@ -21,9 +21,8 @@ static inline unsigned long dma_to_pfn(struct device *dev, dma_addr_t addr) > { > unsigned long pfn = __bus_to_pfn(addr); > > - if (dev) > - pfn += dev->dma_pfn_offset; > - > + if (dev && dev->dma_range_map) > + pfn = PFN_DOWN(translate_dma_to_phys(dev, PFN_PHYS(pfn))); > return pfn; > } > > diff --git a/arch/arm/mach-keystone/keystone.c b/arch/arm/mach-keystone/keystone.c > index dcd031ba84c2e0..09a65c2dfd7327 100644 > --- a/arch/arm/mach-keystone/keystone.c > +++ b/arch/arm/mach-keystone/keystone.c > @@ -8,6 +8,7 @@ > */ > #include > #include > +#include > #include > #include > #include > @@ -25,8 +26,6 @@ > #include "keystone.h" > > #ifdef CONFIG_ARM_LPAE > -static unsigned long keystone_dma_pfn_offset __read_mostly; > - > static int keystone_platform_notifier(struct notifier_block *nb, > unsigned long event, void *data) > { > @@ -39,9 +38,12 @@ static int keystone_platform_notifier(struct notifier_block *nb, > return NOTIFY_BAD; > > if (!dev->of_node) { > - dev->dma_pfn_offset = keystone_dma_pfn_offset; > - dev_err(dev, "set dma_pfn_offset%08lx\n", > - dev->dma_pfn_offset); > + int ret = dma_direct_set_offset(dev, KEYSTONE_HIGH_PHYS_START, > + KEYSTONE_LOW_PHYS_START, > + KEYSTONE_HIGH_PHYS_SIZE); > + dev_err(dev, "set dma_offset%08llx%s\n", > + KEYSTONE_HIGH_PHYS_START - KEYSTONE_LOW_PHYS_START, > + ret ? " failed" : ""); > } > return NOTIFY_OK; > } > @@ -54,11 +56,8 @@ static struct notifier_block platform_nb = { > static void __init keystone_init(void) > { > #ifdef CONFIG_ARM_LPAE > - if (PHYS_OFFSET >= KEYSTONE_HIGH_PHYS_START) { > - keystone_dma_pfn_offset = PFN_DOWN(KEYSTONE_HIGH_PHYS_START - > - KEYSTONE_LOW_PHYS_START); > + if (PHYS_OFFSET >= KEYSTONE_HIGH_PHYS_START) > bus_register_notifier(&platform_bus_type, &platform_nb); > - } > #endif > keystone_pm_runtime_init(); > } > diff --git a/arch/arm/mach-omap1/include/mach/memory.h b/arch/arm/mach-omap1/include/mach/memory.h > index e43697c3297bf2..1142560e0078f5 100644 > --- a/arch/arm/mach-omap1/include/mach/memory.h > +++ b/arch/arm/mach-omap1/include/mach/memory.h > @@ -41,6 +41,10 @@ > __phys_to_pfn(__dma); \ > }) > > +#define __arch_dma_to_virt(dev, addr) ({ (void *) (is_lbus_device(dev) ? \ > + lbus_to_virt(addr) : \ > + __phys_to_virt(addr)); }) > + > #define __arch_virt_to_dma(dev, addr) ({ unsigned long __addr = (unsigned long)(addr); \ > (dma_addr_t) (is_lbus_device(dev) ? \ > virt_to_lbus(__addr) : \ > diff --git a/arch/sh/drivers/pci/pcie-sh7786.c b/arch/sh/drivers/pci/pcie-sh7786.c > index e0b568aaa7014c..4468289ab2cac7 100644 > --- a/arch/sh/drivers/pci/pcie-sh7786.c > +++ b/arch/sh/drivers/pci/pcie-sh7786.c > @@ -12,6 +12,7 @@ > #include > #include > #include > +#include > #include > #include > #include > @@ -31,6 +32,8 @@ struct sh7786_pcie_port { > static struct sh7786_pcie_port *sh7786_pcie_ports; > static unsigned int nr_ports; > static unsigned long dma_pfn_offset; > +size_t memsize; > +u64 memstart; > > static struct sh7786_pcie_hwops { > int (*core_init)(void); > @@ -301,7 +304,6 @@ static int __init pcie_init(struct sh7786_pcie_port *port) > struct pci_channel *chan = port->hose; > unsigned int data; > phys_addr_t memstart, memend; > - size_t memsize; > int ret, i, win; > > /* Begin initialization */ > @@ -368,8 +370,6 @@ static int __init pcie_init(struct sh7786_pcie_port *port) > memstart = ALIGN_DOWN(memstart, memsize); > memsize = roundup_pow_of_two(memend - memstart); > > - dma_pfn_offset = memstart >> PAGE_SHIFT; > - > /* > * If there's more than 512MB of memory, we need to roll over to > * LAR1/LAMR1. > @@ -487,7 +487,8 @@ int pcibios_map_platform_irq(const struct pci_dev *pdev, u8 slot, u8 pin) > > void pcibios_bus_add_device(struct pci_dev *pdev) > { > - pdev->dev.dma_pfn_offset = dma_pfn_offset; > + dma_direct_set_offset(&pdev->dev, __pa(memory_start), > + __pa(memory_start) - memstart, memsize); > } > > static int __init sh7786_pcie_core_init(void) > diff --git a/arch/x86/pci/sta2x11-fixup.c b/arch/x86/pci/sta2x11-fixup.c > index c313d784efabb9..324a207f99956b 100644 > --- a/arch/x86/pci/sta2x11-fixup.c > +++ b/arch/x86/pci/sta2x11-fixup.c > @@ -133,7 +133,7 @@ static void sta2x11_map_ep(struct pci_dev *pdev) > struct sta2x11_instance *instance = sta2x11_pdev_to_instance(pdev); > struct device *dev = &pdev->dev; > u32 amba_base, max_amba_addr; > - int i; > + int i, ret; > > if (!instance) > return; > @@ -141,7 +141,9 @@ static void sta2x11_map_ep(struct pci_dev *pdev) > pci_read_config_dword(pdev, AHB_BASE(0), &amba_base); > max_amba_addr = amba_base + STA2X11_AMBA_SIZE - 1; > > - dev->dma_pfn_offset = PFN_DOWN(-amba_base); > + ret = dma_direct_set_offset(dev, 0, amba_base, STA2X11_AMBA_SIZE); > + if (ret) > + dev_err(dev, "sta2x11: could not set DMA offset\n"); > > dev->bus_dma_limit = max_amba_addr; > pci_set_consistent_dma_mask(pdev, max_amba_addr); > diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c > index ec782e4a0fe419..de18c07ca02cc4 100644 > --- a/drivers/acpi/arm64/iort.c > +++ b/drivers/acpi/arm64/iort.c > @@ -18,6 +18,7 @@ > #include > #include > #include > +#include > > #define IORT_TYPE_MASK(type) (1 << (type)) > #define IORT_MSI_TYPE (1 << ACPI_IORT_NODE_ITS_GROUP) > @@ -1184,8 +1185,9 @@ void iort_dma_setup(struct device *dev, u64 *dma_addr, u64 *dma_size) > *dma_addr = dmaaddr; > *dma_size = size; > > - dev->dma_pfn_offset = PFN_DOWN(offset); > - dev_dbg(dev, "dma_pfn_offset(%#08llx)\n", offset); > + ret = dma_direct_set_offset(dev, dmaaddr + offset, dmaaddr, size); > + > + dev_dbg(dev, "dma_offset(%#08llx)%s\n", offset, ret ? " failed!" : ""); > } > > static void __init acpi_iort_register_irq(int hwirq, const char *name, > diff --git a/drivers/base/core.c b/drivers/base/core.c > index f6f620aa94086d..b893056e39459c 100644 > --- a/drivers/base/core.c > +++ b/drivers/base/core.c > @@ -1792,6 +1792,8 @@ static void device_release(struct kobject *kobj) > */ > devres_release_all(dev); > > + kfree(dev->dma_range_map); > + > if (dev->release) > dev->release(dev); > else if (dev->type && dev->type->release) > diff --git a/drivers/gpu/drm/sun4i/sun4i_backend.c b/drivers/gpu/drm/sun4i/sun4i_backend.c > index 072ea113e6be55..05e9f0d28196d9 100644 > --- a/drivers/gpu/drm/sun4i/sun4i_backend.c > +++ b/drivers/gpu/drm/sun4i/sun4i_backend.c > @@ -11,6 +11,7 @@ > #include > #include > #include > +#include > #include > #include > > @@ -811,8 +812,13 @@ static int sun4i_backend_bind(struct device *dev, struct device *master, > * because of an old DT, we need to set the DMA offset by hand > * on our device since the RAM mapping is at 0 for the DMA bus, > * unlike the CPU. > + * > + * XXX(hch): this has no business in a driver and needs to move > + * to the device tree. > */ > - drm->dev->dma_pfn_offset = PHYS_PFN_OFFSET; > + ret = dma_direct_set_offset(drm->dev, PHYS_OFFSET, 0, SZ_4G); > + if (ret) > + return ret; > } > > backend->engine.node = dev->of_node; > diff --git a/drivers/iommu/io-pgtable-arm.c b/drivers/iommu/io-pgtable-arm.c > index dc7bcf858b6d2d..d77e881516a4ab 100644 > --- a/drivers/iommu/io-pgtable-arm.c > +++ b/drivers/iommu/io-pgtable-arm.c > @@ -751,7 +751,7 @@ arm_lpae_alloc_pgtable(struct io_pgtable_cfg *cfg) > if (cfg->oas > ARM_LPAE_MAX_ADDR_BITS) > return NULL; > > - if (!selftest_running && cfg->iommu_dev->dma_pfn_offset) { > + if (!selftest_running && cfg->iommu_dev->dma_range_map) { > dev_err(cfg->iommu_dev, "Cannot accommodate DMA offset for IOMMU page tables\n"); > return NULL; > } > diff --git a/drivers/media/platform/sunxi/sun4i-csi/sun4i_csi.c b/drivers/media/platform/sunxi/sun4i-csi/sun4i_csi.c > index 5319eb1ab30927..307997ee7f96a2 100644 > --- a/drivers/media/platform/sunxi/sun4i-csi/sun4i_csi.c > +++ b/drivers/media/platform/sunxi/sun4i-csi/sun4i_csi.c > @@ -7,6 +7,7 @@ > */ > > #include > +#include > #include > #include > #include > @@ -182,8 +183,14 @@ static int sun4i_csi_probe(struct platform_device *pdev) > if (ret) > return ret; > } else { > + /* > + * XXX(hch): this has no business in a driver and needs to move > + * to the device tree. > + */ > #ifdef PHYS_PFN_OFFSET > - csi->dev->dma_pfn_offset = PHYS_PFN_OFFSET; > + ret = dma_direct_set_offset(csi->dev, PHYS_OFFSET, 0, SZ_4G); > + if (ret) > + return ret; > #endif > } > > diff --git a/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c b/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c > index 28e89340fed981..e69e14379fc6e4 100644 > --- a/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c > +++ b/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c > @@ -899,8 +899,15 @@ static int sun6i_csi_probe(struct platform_device *pdev) > return -ENOMEM; > > sdev->dev = &pdev->dev; > - /* The DMA bus has the memory mapped at 0 */ > - sdev->dev->dma_pfn_offset = PHYS_OFFSET >> PAGE_SHIFT; > + /* > + * The DMA bus has the memory mapped at 0. > + * > + * XXX(hch): this has no business in a driver and needs to move > + * to the device tree. > + */ > + ret = dma_direct_set_offset(sdev->dev, PHYS_OFFSET, 0, SZ_4G); > + if (ret) > + return ret; > > ret = sun6i_csi_resource_request(sdev, pdev); > if (ret) > diff --git a/drivers/of/address.c b/drivers/of/address.c > index da4f7341323f22..a49ef87aaaf21c 100644 > --- a/drivers/of/address.c > +++ b/drivers/of/address.c > @@ -13,6 +13,7 @@ > #include > #include > #include > +#include /* for bus_dma_region */ > > #include "of_private.h" > > @@ -937,33 +938,33 @@ void __iomem *of_io_request_and_map(struct device_node *np, int index, > } > EXPORT_SYMBOL(of_io_request_and_map); > > +#ifdef CONFIG_HAS_DMA > /** > - * of_dma_get_range - Get DMA range info > + * of_dma_get_range - Get DMA range info and put it into a map array > * @np: device node to get DMA range info > - * @dma_addr: pointer to store initial DMA address of DMA range > - * @paddr: pointer to store initial CPU address of DMA range > - * @size: pointer to store size of DMA range > + * @map: dma range structure to return > * > * Look in bottom up direction for the first "dma-ranges" property > - * and parse it. > - * dma-ranges format: > + * and parse it. Put the information into a DMA offset map array. > + * > + * dma-ranges format: > * DMA addr (dma_addr) : naddr cells > * CPU addr (phys_addr_t) : pna cells > * size : nsize cells > * > - * It returns -ENODEV if "dma-ranges" property was not found > - * for this device in DT. > + * It returns -ENODEV if "dma-ranges" property was not found for this > + * device in the DT. > */ > -int of_dma_get_range(struct device_node *np, u64 *dma_addr, u64 *paddr, u64 *size) > +int of_dma_get_range(struct device_node *np, const struct bus_dma_region **map) > { > struct device_node *node = of_node_get(np); > const __be32 *ranges = NULL; > - int len; > - int ret = 0; > 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; > + struct bus_dma_region *r; > + int len, num_ranges = 0; > + int ret = 0; > > while (node) { > ranges = of_get_property(node, "dma-ranges", &len); > @@ -989,49 +990,39 @@ int of_dma_get_range(struct device_node *np, u64 *dma_addr, u64 *paddr, u64 *siz > } > > of_dma_range_parser_init(&parser, node); > + for_each_of_range(&parser, &range) > + num_ranges++; > + > + r = kcalloc(num_ranges + 1, sizeof(*r), GFP_KERNEL); > + if (!r) { > + ret = -ENOMEM; > + goto out; > + } > > + /* > + * Record all info in the generic DMA ranges array for struct device. > + */ > + *map = r; > + of_dma_range_parser_init(&parser, node); > for_each_of_range(&parser, &range) { > pr_debug("dma_addr(%llx) cpu_addr(%llx) size(%llx)\n", > range.bus_addr, range.cpu_addr, 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; > - } > if (range.cpu_addr == OF_BAD_ADDR) { > pr_err("translation of DMA address(%llx) to CPU address failed node(%pOF)\n", > range.bus_addr, node); > 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; > + r->cpu_start = range.cpu_addr; > + r->dma_start = range.bus_addr; > + r->size = range.size; > + r->offset = range.cpu_addr - range.bus_addr; > + r++; > } > - > - *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); > - > return ret; > } > +#endif /* CONFIG_HAS_DMA */ > > /** > * of_dma_is_coherent - Check if device is coherent > diff --git a/drivers/of/device.c b/drivers/of/device.c > index b439c1e054349b..6e3ae7ebc33eeb 100644 > --- a/drivers/of/device.c > +++ b/drivers/of/device.c > @@ -5,7 +5,7 @@ > #include > #include > #include > -#include > +#include /* for bus_dma_region */ > #include > #include > #include > @@ -90,14 +90,14 @@ int of_device_add(struct platform_device *ofdev) > int of_dma_configure_id(struct device *dev, struct device_node *np, > bool force_dma, const u32 *id) > { > - u64 dma_addr, paddr, size = 0; > - int ret; > - bool coherent; > - unsigned long offset; > const struct iommu_ops *iommu; > - u64 mask, end; > + const struct bus_dma_region *map = NULL; > + dma_addr_t dma_start = 0; > + u64 mask, end, size = 0; > + bool coherent; > + int ret; > > - ret = of_dma_get_range(np, &dma_addr, &paddr, &size); > + ret = of_dma_get_range(np, &map); > if (ret < 0) { > /* > * For legacy reasons, we have to assume some devices need > @@ -106,26 +106,35 @@ int of_dma_configure_id(struct device *dev, struct device_node *np, > */ > if (!force_dma) > return ret == -ENODEV ? 0 : ret; > - > - dma_addr = offset = 0; > } else { > - offset = PFN_DOWN(paddr - dma_addr); > + const struct bus_dma_region *r = map; > + dma_addr_t dma_end = 0; > + > + /* Determine the overall bounds of all DMA regions */ > + for (dma_start = ~(dma_addr_t)0; r->size; r++) { > + /* Take lower and upper limits */ > + if (r->dma_start < dma_start) > + dma_start = r->dma_start; > + if (r->dma_start + r->size > dma_end) > + dma_end = r->dma_start + r->size; > + } > + size = dma_end - dma_start; > > /* > * Add a work around to treat the size as mask + 1 in case > * it is defined in DT as a mask. > */ > if (size & 1) { > - dev_warn(dev, "Invalid size 0x%llx for dma-range\n", > + dev_warn(dev, "Invalid size 0x%llx for dma-range(s)\n", > size); > size = size + 1; > } > > if (!size) { > dev_err(dev, "Adjusted size 0x%llx invalid\n", size); > + kfree(map); > return -EINVAL; > } > - dev_dbg(dev, "dma_pfn_offset(%#08lx)\n", offset); > } > > /* > @@ -144,13 +153,11 @@ int of_dma_configure_id(struct device *dev, struct device_node *np, > else if (!size) > size = 1ULL << 32; > > - dev->dma_pfn_offset = offset; > - > /* > * Limit coherent and dma mask based on size and default mask > * set by the driver. > */ > - end = dma_addr + size - 1; > + end = dma_start + size - 1; > mask = DMA_BIT_MASK(ilog2(end) + 1); > dev->coherent_dma_mask &= mask; > *dev->dma_mask &= mask; > @@ -163,14 +170,17 @@ int of_dma_configure_id(struct device *dev, struct device_node *np, > coherent ? " " : " not "); > > iommu = of_iommu_configure(dev, np, id); > - if (PTR_ERR(iommu) == -EPROBE_DEFER) > + if (PTR_ERR(iommu) == -EPROBE_DEFER) { > + kfree(map); > return -EPROBE_DEFER; > + } > > dev_dbg(dev, "device is%sbehind an iommu\n", > iommu ? " " : " not "); > > - arch_setup_dma_ops(dev, dma_addr, size, iommu, coherent); > + arch_setup_dma_ops(dev, dma_start, size, iommu, coherent); > > + dev->dma_range_map = map; > return 0; > } > EXPORT_SYMBOL_GPL(of_dma_configure_id); > diff --git a/drivers/of/of_private.h b/drivers/of/of_private.h > index edc682249c0015..d9e6a324de0a77 100644 > --- a/drivers/of/of_private.h > +++ b/drivers/of/of_private.h > @@ -157,12 +157,13 @@ extern void __of_sysfs_remove_bin_file(struct device_node *np, > extern int of_bus_n_addr_cells(struct device_node *np); > extern int of_bus_n_size_cells(struct device_node *np); > > -#ifdef CONFIG_OF_ADDRESS > -extern int of_dma_get_range(struct device_node *np, u64 *dma_addr, > - u64 *paddr, u64 *size); > +struct bus_dma_region; > +#if defined(CONFIG_OF_ADDRESS) && defined(CONFIG_HAS_DMA) > +int of_dma_get_range(struct device_node *np, > + const struct bus_dma_region **map); > #else > -static inline int of_dma_get_range(struct device_node *np, u64 *dma_addr, > - u64 *paddr, u64 *size) > +static inline int of_dma_get_range(struct device_node *np, > + const struct bus_dma_region **map) > { > return -ENODEV; > } > diff --git a/drivers/of/unittest.c b/drivers/of/unittest.c > index 9b7e84bdc7d446..06cc988faf78b3 100644 > --- a/drivers/of/unittest.c > +++ b/drivers/of/unittest.c > @@ -7,6 +7,7 @@ > > #include > #include > +#include /* to test phys_to_dma/dma_to_phys */ > #include > #include > #include > @@ -869,10 +870,11 @@ static void __init of_unittest_changeset(void) > } > > static void __init of_unittest_dma_ranges_one(const char *path, > - u64 expect_dma_addr, u64 expect_paddr, u64 expect_size) > + u64 expect_dma_addr, u64 expect_paddr) > { > +#ifdef CONFIG_HAS_DMA > struct device_node *np; > - u64 dma_addr, paddr, size; > + const struct bus_dma_region *map = NULL; > int rc; > > np = of_find_node_by_path(path); > @@ -881,28 +883,40 @@ static void __init of_unittest_dma_ranges_one(const char *path, > return; > } > > - rc = of_dma_get_range(np, &dma_addr, &paddr, &size); > + rc = of_dma_get_range(np, &map); > > unittest(!rc, "of_dma_get_range failed on node %pOF rc=%i\n", np, rc); > + > if (!rc) { > - unittest(size == expect_size, > - "of_dma_get_range wrong size on node %pOF size=%llx\n", np, size); > + phys_addr_t paddr; > + dma_addr_t dma_addr; > + struct device dev_bogus; > + > + dev_bogus.dma_range_map = map; > + paddr = dma_to_phys(&dev_bogus, expect_dma_addr); > + dma_addr = phys_to_dma(&dev_bogus, expect_paddr); > + > unittest(paddr == expect_paddr, > - "of_dma_get_range wrong phys addr (%llx) on node %pOF", paddr, np); > + "of_dma_get_range: wrong phys addr %pap (expecting %llx) on node %pOF\n", > + &paddr, expect_paddr, np); > unittest(dma_addr == expect_dma_addr, > - "of_dma_get_range wrong DMA addr (%llx) on node %pOF", dma_addr, np); > + "of_dma_get_range: wrong DMA addr %pad (expecting %llx) on node %pOF\n", > + &dma_addr, expect_dma_addr, np); > + > + kfree(map); > } > of_node_put(np); > +#endif > } > > static void __init of_unittest_parse_dma_ranges(void) > { > of_unittest_dma_ranges_one("/testcase-data/address-tests/device@70000000", > - 0x0, 0x20000000, 0x40000000); > + 0x0, 0x20000000); > of_unittest_dma_ranges_one("/testcase-data/address-tests/bus@80000000/device@1000", > - 0x100000000, 0x20000000, 0x2000000000); > + 0x100000000, 0x20000000); > of_unittest_dma_ranges_one("/testcase-data/address-tests/pci@90000000", > - 0x80000000, 0x20000000, 0x10000000); > + 0x80000000, 0x20000000); > } > > static void __init of_unittest_pci_dma_ranges(void) > diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c > index 7f90eeea67e279..8157dd491d2819 100644 > --- a/drivers/remoteproc/remoteproc_core.c > +++ b/drivers/remoteproc/remoteproc_core.c > @@ -23,6 +23,7 @@ > #include > #include > #include > +#include /* XXX: pokes into bus_dma_range */ > #include > #include > #include > @@ -458,6 +459,25 @@ static void rproc_rvdev_release(struct device *dev) > kfree(rvdev); > } > > +static int copy_dma_range_map(struct device *to, struct device *from) > +{ > + const struct bus_dma_region *map = from->dma_range_map, *new_map, *r; > + int num_ranges = 0; > + > + if (!map) > + return 0; > + > + for (r = map; r->size; r++) > + num_ranges++; > + > + new_map = kmemdup(map, array_size(num_ranges + 1, sizeof(*map)), > + GFP_KERNEL); > + if (!new_map) > + return -ENOMEM; > + to->dma_range_map = new_map; > + return 0; > +} > + This patch seemed Ok to me but it broke the stm32 remoteproc implementation. When I tested things out function dma_coerce_mask_and_cohenrent() returns -5 and the rest of the initialisation fails. I isolated things to function dma_to_pfn() [2]. In the original implementation __bus_to_pfn() returns 0xfffff and dev->dma_pfn_offset is equal to 0x38000. As such the function returns 0x137fff and dma_supported() a non-zero value[3]. With this set function dma_to_pfn() received a face lift. Function __bus_to_pfn() still returns 0xfffff but translate_dma_to_phys() returns 0, which forces dma_supported() to also return 0 and that is where the -5 (-EIO) comes from. Taking a futher look at translate_dma_to_phy(), @dma_addr never falls within the bus_dma_region ranges and returns 0. I'm suspecting an initialisation problem and if it occurred here, it will likely show up elsewhere. Thanks, Mathieu [1]. https://elixir.bootlin.com/linux/v5.9-rc4/source/drivers/remoteproc/stm32_rproc.c#L773 [2]. https://elixir.bootlin.com/linux/v5.9-rc4/source/arch/arm/include/asm/dma-mapping.h#L43 [3]. https://elixir.bootlin.com/linux/v5.9-rc4/source/kernel/dma/mapping.c#L539 > /** > * rproc_handle_vdev() - handle a vdev fw resource > * @rproc: the remote processor > @@ -529,7 +549,9 @@ static int rproc_handle_vdev(struct rproc *rproc, struct fw_rsc_vdev *rsc, > /* Initialise vdev subdevice */ > snprintf(name, sizeof(name), "vdev%dbuffer", rvdev->index); > rvdev->dev.parent = &rproc->dev; > - rvdev->dev.dma_pfn_offset = rproc->dev.parent->dma_pfn_offset; > + ret = copy_dma_range_map(&rvdev->dev, rproc->dev.parent); > + if (ret) > + return ret; > rvdev->dev.release = rproc_rvdev_release; > dev_set_name(&rvdev->dev, "%s#%s", dev_name(rvdev->dev.parent), name); > dev_set_drvdata(&rvdev->dev, rvdev); > diff --git a/drivers/staging/media/sunxi/cedrus/cedrus_hw.c b/drivers/staging/media/sunxi/cedrus/cedrus_hw.c > index 1744e6fcc99980..bcf050a04ffc45 100644 > --- a/drivers/staging/media/sunxi/cedrus/cedrus_hw.c > +++ b/drivers/staging/media/sunxi/cedrus/cedrus_hw.c > @@ -227,11 +227,17 @@ int cedrus_hw_probe(struct cedrus_dev *dev) > * the RAM offset to the physcal addresses. > * > * This information will eventually be obtained from device-tree. > + * > + * XXX(hch): this has no business in a driver and needs to move > + * to the device tree. > */ > > #ifdef PHYS_PFN_OFFSET > - if (!(variant->quirks & CEDRUS_QUIRK_NO_DMA_OFFSET)) > - dev->dev->dma_pfn_offset = PHYS_PFN_OFFSET; > + if (!(variant->quirks & CEDRUS_QUIRK_NO_DMA_OFFSET)) { > + ret = dma_direct_set_offset(dev->dev, PHYS_OFFSET, 0, SZ_4G); > + if (ret) > + return ret; > + } > #endif > > ret = of_reserved_mem_device_init(dev->dev); > diff --git a/include/linux/device.h b/include/linux/device.h > index ca18da4768e3e8..1c78621fc3c01f 100644 > --- a/include/linux/device.h > +++ b/include/linux/device.h > @@ -466,7 +466,7 @@ struct dev_links_info { > * such descriptors. > * @bus_dma_limit: Limit of an upstream bridge or bus which imposes a smaller > * DMA limit than the device itself supports. > - * @dma_pfn_offset: offset of DMA memory range relatively of RAM > + * @dma_range_map: map for DMA memory ranges relative to that of RAM > * @dma_parms: A low level driver may set these to teach IOMMU code about > * segment limitations. > * @dma_pools: Dma pools (if dma'ble device). > @@ -561,7 +561,7 @@ struct device { > 64 bit addresses for consistent > allocations such descriptors. */ > u64 bus_dma_limit; /* upstream dma constraint */ > - unsigned long dma_pfn_offset; > + const struct bus_dma_region *dma_range_map; > > struct device_dma_parameters *dma_parms; > > diff --git a/include/linux/dma-direct.h b/include/linux/dma-direct.h > index 805010ea5346f9..bd619579505687 100644 > --- a/include/linux/dma-direct.h > +++ b/include/linux/dma-direct.h > @@ -14,6 +14,41 @@ > > extern unsigned int zone_dma_bits; > > +/* > + * Record the mapping of CPU physical to DMA addresses for a given region. > + */ > +struct bus_dma_region { > + phys_addr_t cpu_start; > + dma_addr_t dma_start; > + u64 size; > + u64 offset; > +}; > + > +static inline dma_addr_t translate_phys_to_dma(struct device *dev, > + phys_addr_t paddr) > +{ > + const struct bus_dma_region *m; > + > + for (m = dev->dma_range_map; m->size; m++) > + if (paddr >= m->cpu_start && paddr - m->cpu_start < m->size) > + return (dma_addr_t)paddr - m->offset; > + > + /* make sure dma_capable fails when no translation is available */ > + return DMA_MAPPING_ERROR; > +} > + > +static inline phys_addr_t translate_dma_to_phys(struct device *dev, > + dma_addr_t dma_addr) > +{ > + const struct bus_dma_region *m; > + > + for (m = dev->dma_range_map; m->size; m++) > + if (dma_addr >= m->dma_start && dma_addr - m->dma_start < m->size) > + return (phys_addr_t)dma_addr + m->offset; > + > + return 0; > +} > + > #ifdef CONFIG_ARCH_HAS_PHYS_TO_DMA > #include > #ifndef phys_to_dma_unencrypted > @@ -23,9 +58,9 @@ extern unsigned int zone_dma_bits; > static inline dma_addr_t phys_to_dma_unencrypted(struct device *dev, > phys_addr_t paddr) > { > - dma_addr_t dev_addr = (dma_addr_t)paddr; > - > - return dev_addr - ((dma_addr_t)dev->dma_pfn_offset << PAGE_SHIFT); > + if (dev->dma_range_map) > + return translate_phys_to_dma(dev, paddr); > + return paddr; > } > > /* > @@ -41,8 +76,12 @@ static inline dma_addr_t phys_to_dma(struct device *dev, phys_addr_t paddr) > > static inline phys_addr_t dma_to_phys(struct device *dev, dma_addr_t dev_addr) > { > - phys_addr_t paddr = (phys_addr_t)dev_addr + > - ((phys_addr_t)dev->dma_pfn_offset << PAGE_SHIFT); > + phys_addr_t paddr; > + > + if (dev->dma_range_map) > + paddr = translate_dma_to_phys(dev, dma_addr); > + else > + paddr = dma_addr; > > return __sme_clr(paddr); > } > @@ -64,7 +103,8 @@ static inline bool dma_capable(struct device *dev, dma_addr_t addr, size_t size, > > if (!dev->dma_mask) > return false; > - > + if (addr == DMA_MAPPING_ERROR) > + return false; > if (is_ram && !IS_ENABLED(CONFIG_ARCH_DMA_ADDR_T_64BIT) && > min(addr, end) < phys_to_dma(dev, PFN_PHYS(min_low_pfn))) > return false; > diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h > index df0bff2ea750e0..bb138ac6f5e63e 100644 > --- a/include/linux/dma-mapping.h > +++ b/include/linux/dma-mapping.h > @@ -730,4 +730,11 @@ static inline int dma_mmap_wc(struct device *dev, > #define dma_unmap_len_set(PTR, LEN_NAME, VAL) do { } while (0) > #endif > > -#endif > +/* > + * Legacy interface to set up the dma offset map. Drivers really should not > + * actually use it, but we have a few legacy cases left. > + */ > +int dma_direct_set_offset(struct device *dev, phys_addr_t cpu_start, > + dma_addr_t dma_start, u64 size); > + > +#endif /* _LINUX_DMA_MAPPING_H */ > diff --git a/kernel/dma/coherent.c b/kernel/dma/coherent.c > index f85d14bbfcbe03..c0685196fb6d42 100644 > --- a/kernel/dma/coherent.c > +++ b/kernel/dma/coherent.c > @@ -7,7 +7,7 @@ > #include > #include > #include > -#include > +#include > > struct dma_coherent_mem { > void *virt_base; > @@ -32,9 +32,8 @@ static inline dma_addr_t dma_get_device_base(struct device *dev, > struct dma_coherent_mem * mem) > { > if (mem->use_dev_dma_pfn_offset) > - return (mem->pfn_base - dev->dma_pfn_offset) << PAGE_SHIFT; > - else > - return mem->device_base; > + return phys_to_dma(dev, PFN_PHYS(mem->pfn_base)); > + return mem->device_base; > } > > static int dma_init_coherent_memory(phys_addr_t phys_addr, > diff --git a/kernel/dma/direct.c b/kernel/dma/direct.c > index 54db9cfdaecc6d..750659f7447c4b 100644 > --- a/kernel/dma/direct.c > +++ b/kernel/dma/direct.c > @@ -13,6 +13,7 @@ > #include > #include > #include > +#include > > /* > * Most architectures use ZONE_DMA for the first 16 Megabytes, but some use it > @@ -66,8 +67,12 @@ static gfp_t dma_direct_optimal_gfp_mask(struct device *dev, u64 dma_mask, > > static bool dma_coherent_ok(struct device *dev, phys_addr_t phys, size_t size) > { > - return phys_to_dma_direct(dev, phys) + size - 1 <= > - min_not_zero(dev->coherent_dma_mask, dev->bus_dma_limit); > + dma_addr_t dma_addr = phys_to_dma_direct(dev, phys); > + > + if (dma_addr == DMA_MAPPING_ERROR) > + return false; > + return dma_addr + size - 1 <= > + min_not_zero(dev->coherent_dma_mask, dev->bus_dma_limit); > } > > /* > @@ -461,3 +466,45 @@ bool dma_direct_need_sync(struct device *dev, dma_addr_t dma_addr) > return !dev_is_dma_coherent(dev) || > is_swiotlb_buffer(dma_to_phys(dev, dma_addr)); > } > + > +/** > + * dma_direct_set_offset - Assign scalar offset for a single DMA range. > + * @dev: device pointer; needed to "own" the alloced memory. > + * @cpu_start: beginning of memory region covered by this offset. > + * @dma_start: beginning of DMA/PCI region covered by this offset. > + * @size: size of the region. > + * > + * This is for the simple case of a uniform offset which cannot > + * be discovered by "dma-ranges". > + * > + * It returns -ENOMEM if out of memory, -EINVAL if a map > + * already exists, 0 otherwise. > + * > + * Note: any call to this from a driver is a bug. The mapping needs > + * to be described by the device tree or other firmware interfaces. > + */ > +int dma_direct_set_offset(struct device *dev, phys_addr_t cpu_start, > + dma_addr_t dma_start, u64 size) > +{ > + struct bus_dma_region *map; > + u64 offset = (u64)cpu_start - (u64)dma_start; > + > + if (dev->dma_range_map) { > + dev_err(dev, "attempt to add DMA range to existing map\n"); > + return -EINVAL; > + } > + > + if (!offset) > + return 0; > + > + map = kcalloc(2, sizeof(*map), GFP_KERNEL); > + if (!map) > + return -ENOMEM; > + map[0].cpu_start = cpu_start; > + map[0].dma_start = dma_start; > + map[0].offset = offset; > + map[0].size = size; > + dev->dma_range_map = map; > + return 0; > +} > +EXPORT_SYMBOL_GPL(dma_direct_set_offset); > -- > 2.28.0 >