From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754062AbdDDKUX (ORCPT ); Tue, 4 Apr 2017 06:20:23 -0400 Received: from smtp.codeaurora.org ([198.145.29.96]:46696 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753079AbdDDKTw (ORCPT ); Tue, 4 Apr 2017 06:19:52 -0400 DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 1A24F60F69 Authentication-Results: pdx-caf-mail.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: pdx-caf-mail.web.codeaurora.org; spf=none smtp.mailfrom=sricharan@codeaurora.org From: Sricharan R To: robin.murphy@arm.com, will.deacon@arm.com, joro@8bytes.org, lorenzo.pieralisi@arm.com, iommu@lists.linux-foundation.org, linux-arm-kernel@lists.infradead.org, linux-arm-msm@vger.kernel.org, m.szyprowski@samsung.com, bhelgaas@google.com, linux-pci@vger.kernel.org, linux-acpi@vger.kernel.org, tn@semihalf.com, hanjun.guo@linaro.org, okaya@codeaurora.org, robh+dt@kernel.org, frowand.list@gmail.com, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, sudeep.holla@arm.com, rjw@rjwysocki.net, lenb@kernel.org, catalin.marinas@arm.com, arnd@arndb.de, linux-arch@vger.kernel.org, gregkh@linuxfoundation.org Cc: sricharan@codeaurora.org Subject: [PATCH V10 07/12] of/acpi: Configure dma operations at probe time for platform/amba/pci bus devices Date: Tue, 4 Apr 2017 15:48:20 +0530 Message-Id: <1491301105-5274-8-git-send-email-sricharan@codeaurora.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1491301105-5274-1-git-send-email-sricharan@codeaurora.org> References: <1489086061-9356-1-git-send-email-sricharan@codeaurora.org> <1491301105-5274-1-git-send-email-sricharan@codeaurora.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Configuring DMA ops at probe time will allow deferring device probe when the IOMMU isn't available yet. The dma_configure for the device is now called from the generic device_attach callback just before the bus/driver probe is called. This way, configuring the DMA ops for the device would be called at the same place for all bus_types, hence the deferred probing mechanism should work for all buses as well. pci_bus_add_devices (platform/amba)(_device_create/driver_register) | | pci_bus_add_device (device_add/driver_register) | | device_attach device_initial_probe | | __device_attach_driver __device_attach_driver | driver_probe_device | really_probe | dma_configure Similarly on the device/driver_unregister path __device_release_driver is called which inturn calls dma_deconfigure. This patch changes the dma ops configuration to probe time for both OF and ACPI based platform/amba/pci bus devices. Tested-by: Marek Szyprowski Tested-by: Hanjun Guo Acked-by: Bjorn Helgaas (drivers/pci part) Acked-by: Rafael J. Wysocki Signed-off-by: Sricharan R --- [V10] Added dummy dma_(de)configure functions in case of !CONFIG_HAS_DMA to avoid build breaks. drivers/acpi/glue.c | 5 ----- drivers/base/dd.c | 9 +++++++++ drivers/base/dma-mapping.c | 40 ++++++++++++++++++++++++++++++++++++++++ drivers/of/platform.c | 5 +---- drivers/pci/probe.c | 28 ---------------------------- include/linux/dma-mapping.h | 12 ++++++++++++ 6 files changed, 62 insertions(+), 37 deletions(-) diff --git a/drivers/acpi/glue.c b/drivers/acpi/glue.c index fb19e1c..c05f241 100644 --- a/drivers/acpi/glue.c +++ b/drivers/acpi/glue.c @@ -176,7 +176,6 @@ int acpi_bind_one(struct device *dev, struct acpi_device *acpi_dev) struct list_head *physnode_list; unsigned int node_id; int retval = -EINVAL; - enum dev_dma_attr attr; if (has_acpi_companion(dev)) { if (acpi_dev) { @@ -233,10 +232,6 @@ int acpi_bind_one(struct device *dev, struct acpi_device *acpi_dev) if (!has_acpi_companion(dev)) ACPI_COMPANION_SET(dev, acpi_dev); - attr = acpi_get_dma_attr(acpi_dev); - if (attr != DEV_DMA_NOT_SUPPORTED) - acpi_dma_configure(dev, attr); - acpi_physnode_link_name(physical_node_name, node_id); retval = sysfs_create_link(&acpi_dev->dev.kobj, &dev->kobj, physical_node_name); diff --git a/drivers/base/dd.c b/drivers/base/dd.c index a1fbf55..4882f06 100644 --- a/drivers/base/dd.c +++ b/drivers/base/dd.c @@ -19,6 +19,7 @@ #include #include +#include #include #include #include @@ -356,6 +357,10 @@ static int really_probe(struct device *dev, struct device_driver *drv) if (ret) goto pinctrl_bind_failed; + ret = dma_configure(dev); + if (ret) + goto dma_failed; + if (driver_sysfs_add(dev)) { printk(KERN_ERR "%s: driver_sysfs_add(%s) failed\n", __func__, dev_name(dev)); @@ -417,6 +422,8 @@ static int really_probe(struct device *dev, struct device_driver *drv) goto done; probe_failed: + dma_deconfigure(dev); +dma_failed: if (dev->bus) blocking_notifier_call_chain(&dev->bus->p->bus_notifier, BUS_NOTIFY_DRIVER_NOT_BOUND, dev); @@ -826,6 +833,8 @@ static void __device_release_driver(struct device *dev, struct device *parent) drv->remove(dev); device_links_driver_cleanup(dev); + dma_deconfigure(dev); + devres_release_all(dev); dev->driver = NULL; dev_set_drvdata(dev, NULL); diff --git a/drivers/base/dma-mapping.c b/drivers/base/dma-mapping.c index efd71cf..449b948 100644 --- a/drivers/base/dma-mapping.c +++ b/drivers/base/dma-mapping.c @@ -7,9 +7,11 @@ * This file is released under the GPLv2. */ +#include #include #include #include +#include #include #include @@ -341,3 +343,41 @@ void dma_common_free_remap(void *cpu_addr, size_t size, unsigned long vm_flags) vunmap(cpu_addr); } #endif + +/* + * Common configuration to enable DMA API use for a device + */ +#include + +int dma_configure(struct device *dev) +{ + struct device *bridge = NULL, *dma_dev = dev; + enum dev_dma_attr attr; + + if (dev_is_pci(dev)) { + bridge = pci_get_host_bridge_device(to_pci_dev(dev)); + dma_dev = bridge; + if (IS_ENABLED(CONFIG_OF) && dma_dev->parent && + dma_dev->parent->of_node) + dma_dev = dma_dev->parent; + } + + if (dma_dev->of_node) { + of_dma_configure(dev, dma_dev->of_node); + } else if (has_acpi_companion(dma_dev)) { + attr = acpi_get_dma_attr(to_acpi_device_node(dma_dev->fwnode)); + if (attr != DEV_DMA_NOT_SUPPORTED) + acpi_dma_configure(dev, attr); + } + + if (bridge) + pci_put_host_bridge_device(bridge); + + return 0; +} + +void dma_deconfigure(struct device *dev) +{ + of_dma_deconfigure(dev); + acpi_dma_deconfigure(dev); +} diff --git a/drivers/of/platform.c b/drivers/of/platform.c index 5344db5..2aa4ebb 100644 --- a/drivers/of/platform.c +++ b/drivers/of/platform.c @@ -22,6 +22,7 @@ #include #include #include +#include #include #include #include @@ -186,11 +187,9 @@ static struct platform_device *of_platform_device_create_pdata( dev->dev.bus = &platform_bus_type; dev->dev.platform_data = platform_data; - of_dma_configure(&dev->dev, dev->dev.of_node); of_msi_configure(&dev->dev, dev->dev.of_node); if (of_device_add(dev) != 0) { - of_dma_deconfigure(&dev->dev); platform_device_put(dev); goto err_clear_flag; } @@ -248,7 +247,6 @@ static struct amba_device *of_amba_device_create(struct device_node *node, dev_set_name(&dev->dev, "%s", bus_id); else of_device_make_bus_id(&dev->dev); - of_dma_configure(&dev->dev, dev->dev.of_node); /* Allow the HW Peripheral ID to be overridden */ prop = of_get_property(node, "arm,primecell-periphid", NULL); @@ -542,7 +540,6 @@ static int of_platform_device_destroy(struct device *dev, void *data) amba_device_unregister(to_amba_device(dev)); #endif - of_dma_deconfigure(dev); of_node_clear_flag(dev->of_node, OF_POPULATED); of_node_clear_flag(dev->of_node, OF_POPULATED_BUS); return 0; diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c index dfc9a27..5a8dd43 100644 --- a/drivers/pci/probe.c +++ b/drivers/pci/probe.c @@ -1893,33 +1893,6 @@ static void pci_set_msi_domain(struct pci_dev *dev) dev_set_msi_domain(&dev->dev, d); } -/** - * pci_dma_configure - Setup DMA configuration - * @dev: ptr to pci_dev struct of the PCI device - * - * Function to update PCI devices's DMA configuration using the same - * info from the OF node or ACPI node of host bridge's parent (if any). - */ -static void pci_dma_configure(struct pci_dev *dev) -{ - struct device *bridge = pci_get_host_bridge_device(dev); - - if (IS_ENABLED(CONFIG_OF) && - bridge->parent && bridge->parent->of_node) { - of_dma_configure(&dev->dev, bridge->parent->of_node); - } else if (has_acpi_companion(bridge)) { - struct acpi_device *adev = to_acpi_device_node(bridge->fwnode); - enum dev_dma_attr attr = acpi_get_dma_attr(adev); - - if (attr == DEV_DMA_NOT_SUPPORTED) - dev_warn(&dev->dev, "DMA not supported.\n"); - else - acpi_dma_configure(&dev->dev, attr); - } - - pci_put_host_bridge_device(bridge); -} - void pci_device_add(struct pci_dev *dev, struct pci_bus *bus) { int ret; @@ -1933,7 +1906,6 @@ void pci_device_add(struct pci_dev *dev, struct pci_bus *bus) dev->dev.dma_mask = &dev->dma_mask; dev->dev.dma_parms = &dev->dma_parms; dev->dev.coherent_dma_mask = 0xffffffffull; - pci_dma_configure(dev); pci_set_dma_max_seg_size(dev, 65536); pci_set_dma_seg_boundary(dev, 0xffffffff); diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h index 0977317..4f3eece 100644 --- a/include/linux/dma-mapping.h +++ b/include/linux/dma-mapping.h @@ -728,6 +728,18 @@ void *dma_mark_declared_memory_occupied(struct device *dev, } #endif /* CONFIG_HAVE_GENERIC_DMA_COHERENT */ +#ifdef CONFIG_HAS_DMA +int dma_configure(struct device *dev); +void dma_deconfigure(struct device *dev); +#else +static inline int dma_configure(struct device *dev) +{ + return 0; +} + +static inline void dma_deconfigure(struct device *dev) {} +#endif + /* * Managed DMA API */ -- QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation