LKML Archive on lore.kernel.org
help / color / mirror / Atom feed
From: Bharat Bhushan <bharat.bhushan@nxp.com>
To: Nipun Gupta <nipun.gupta@nxp.com>,
	"robin.murphy@arm.com" <robin.murphy@arm.com>,
	"hch@lst.de" <hch@lst.de>,
	"linux@armlinux.org.uk" <linux@armlinux.org.uk>,
	"gregkh@linuxfoundation.org" <gregkh@linuxfoundation.org>,
	"m.szyprowski@samsung.com" <m.szyprowski@samsung.com>
Cc: "bhelgaas@google.com" <bhelgaas@google.com>,
	"zajec5@gmail.com" <zajec5@gmail.com>,
	"andy.gross@linaro.org" <andy.gross@linaro.org>,
	"david.brown@linaro.org" <david.brown@linaro.org>,
	"dan.j.williams@intel.com" <dan.j.williams@intel.com>,
	"vinod.koul@intel.com" <vinod.koul@intel.com>,
	"thierry.reding@gmail.com" <thierry.reding@gmail.com>,
	"robh+dt@kernel.org" <robh+dt@kernel.org>,
	"frowand.list@gmail.com" <frowand.list@gmail.com>,
	"jarkko.sakkinen@linux.intel.com"
	<jarkko.sakkinen@linux.intel.com>,
	"rafael.j.wysocki@intel.com" <rafael.j.wysocki@intel.com>,
	"dmitry.torokhov@gmail.com" <dmitry.torokhov@gmail.com>,
	"johan@kernel.org" <johan@kernel.org>,
	"msuchanek@suse.de" <msuchanek@suse.de>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"iommu@lists.linux-foundation.org"
	<iommu@lists.linux-foundation.org>,
	"linux-wireless@vger.kernel.org" <linux-wireless@vger.kernel.org>,
	"linux-arm-msm@vger.kernel.org" <linux-arm-msm@vger.kernel.org>,
	"linux-soc@vger.kernel.org" <linux-soc@vger.kernel.org>,
	"dmaengine@vger.kernel.org" <dmaengine@vger.kernel.org>,
	"dri-devel@lists.freedesktop.org"
	<dri-devel@lists.freedesktop.org>,
	"linux-tegra@vger.kernel.org" <linux-tegra@vger.kernel.org>,
	"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
	"linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
	Leo Li <leoyang.li@nxp.com>
Subject: RE: [PATCH v2 1/2] dma-mapping: move dma configuration to bus infrastructure
Date: Wed, 21 Mar 2018 07:19:15 +0000	[thread overview]
Message-ID: <AM5PR0401MB254503027680DE6A23355D909AAA0@AM5PR0401MB2545.eurprd04.prod.outlook.com> (raw)
In-Reply-To: <1521615323-4752-1-git-send-email-nipun.gupta@nxp.com>



> -----Original Message-----
> From: Nipun Gupta
> Sent: Wednesday, March 21, 2018 12:25 PM
> To: robin.murphy@arm.com; hch@lst.de; linux@armlinux.org.uk;
> gregkh@linuxfoundation.org; m.szyprowski@samsung.com
> Cc: bhelgaas@google.com; zajec5@gmail.com; andy.gross@linaro.org;
> david.brown@linaro.org; dan.j.williams@intel.com; vinod.koul@intel.com;
> thierry.reding@gmail.com; robh+dt@kernel.org; frowand.list@gmail.com;
> jarkko.sakkinen@linux.intel.com; rafael.j.wysocki@intel.com;
> dmitry.torokhov@gmail.com; johan@kernel.org; msuchanek@suse.de; linux-
> kernel@vger.kernel.org; iommu@lists.linux-foundation.org; linux-
> wireless@vger.kernel.org; linux-arm-msm@vger.kernel.org; linux-
> soc@vger.kernel.org; dmaengine@vger.kernel.org; dri-
> devel@lists.freedesktop.org; linux-tegra@vger.kernel.org;
> devicetree@vger.kernel.org; linux-pci@vger.kernel.org; Bharat Bhushan
> <bharat.bhushan@nxp.com>; Leo Li <leoyang.li@nxp.com>; Nipun Gupta
> <nipun.gupta@nxp.com>
> Subject: [PATCH v2 1/2] dma-mapping: move dma configuration to bus
> infrastructure
> 
> It's bus specific aspect to map a given device on the bus and relevant firmware
> description of its DMA configuration.
> So, this change introduces '/dma_configure/' as bus callback giving flexibility to
> busses for implementing its own dma configuration function.
> 
> The change eases the addition of new busses w.r.t. adding the dma
> configuration functionality.
> 
> This patch also updates the PCI, Platform, ACPI and host1x bus to use new
> introduced callbacks.
> 
> Suggested-by: Christoph Hellwig <hch@lst.de>
> Signed-off-by: Nipun Gupta <nipun.gupta@nxp.com>
> ---
>  - The patches are based on the comments on:
>    https://patchwork.kernel.org/patch/10259087/
> 
> Changes in v2:
>   - Do not have dma_deconfigure callback
>   - Have '/dma_common_configure/' API to provide a common DMA
>     configuration which can be used by busses if it suits them.
>   - Platform and ACPI bus to use '/dma_common_configure/' in
>     '/dma_configure/' callback.
>   - Updated commit message
>   - Updated pci_dma_configure API with changes suggested by Robin
> 
>  drivers/amba/bus.c          |  7 +++++++
>  drivers/base/dma-mapping.c  | 35 +++++++++++++++--------------------
>  drivers/base/platform.c     |  6 ++++++
>  drivers/gpu/host1x/bus.c    |  9 +++++++++
>  drivers/pci/pci-driver.c    | 32 ++++++++++++++++++++++++++++++++
>  include/linux/device.h      |  4 ++++
>  include/linux/dma-mapping.h |  1 +
>  7 files changed, 74 insertions(+), 20 deletions(-)
> 
> diff --git a/drivers/amba/bus.c b/drivers/amba/bus.c index 594c228..2fa1e8b
> 100644
> --- a/drivers/amba/bus.c
> +++ b/drivers/amba/bus.c
> @@ -20,6 +20,7 @@
>  #include <linux/sizes.h>
>  #include <linux/limits.h>
>  #include <linux/clk/clk-conf.h>
> +#include <linux/dma-mapping.h>
> 
>  #include <asm/irq.h>
> 
> @@ -171,6 +172,11 @@ static int amba_pm_runtime_resume(struct device
> *dev)  }  #endif /* CONFIG_PM */
> 
> +static int amba_dma_configure(struct device *dev) {
> +	return dma_common_configure(dev);
> +}
> +
>  static const struct dev_pm_ops amba_pm = {
>  	.suspend	= pm_generic_suspend,
>  	.resume		= pm_generic_resume,
> @@ -194,6 +200,7 @@ struct bus_type amba_bustype = {
>  	.dev_groups	= amba_dev_groups,
>  	.match		= amba_match,
>  	.uevent		= amba_uevent,
> +	.dma_configure	= amba_dma_configure,
>  	.pm		= &amba_pm,
>  	.force_dma	= true,
>  };
> diff --git a/drivers/base/dma-mapping.c b/drivers/base/dma-mapping.c index
> 3b11835..48f9af0 100644
> --- a/drivers/base/dma-mapping.c
> +++ b/drivers/base/dma-mapping.c
> @@ -331,38 +331,33 @@ void dma_common_free_remap(void *cpu_addr,
> size_t size, unsigned long vm_flags)  #endif
> 
>  /*
> - * Common configuration to enable DMA API use for a device
> + * Common configuration to enable DMA API use for a device.
> + * A bus can use this function in its 'dma_configure' callback, if
> + * suitable for the bus.
>   */
> -#include <linux/pci.h>
> -
> -int dma_configure(struct device *dev)
> +int dma_common_configure(struct device *dev)
>  {
> -	struct device *bridge = NULL, *dma_dev = dev;
>  	enum dev_dma_attr attr;
>  	int ret = 0;
> 
> -	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) {
> -		ret = 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 (dev->of_node) {
> +		ret = of_dma_configure(dev, dev->of_node);
> +	} else if (has_acpi_companion(dev)) {
> +		attr = acpi_get_dma_attr(to_acpi_device_node(dev->fwnode));
>  		if (attr != DEV_DMA_NOT_SUPPORTED)
>  			ret = acpi_dma_configure(dev, attr);
>  	}
> 
> -	if (bridge)
> -		pci_put_host_bridge_device(bridge);
> -
>  	return ret;
>  }
> 
> +int dma_configure(struct device *dev)
> +{
> +	if (dev->bus->dma_configure)
> +		return dev->bus->dma_configure(dev);

What if dma_common_configure() is called in case "bus->dma_configure" is not defined?

Thanks
-Bharat

> +
> +	return 0;
> +}
>  void dma_deconfigure(struct device *dev)  {
>  	of_dma_deconfigure(dev);
> diff --git a/drivers/base/platform.c b/drivers/base/platform.c index
> f1bf7b3..d2d5891 100644
> --- a/drivers/base/platform.c
> +++ b/drivers/base/platform.c
> @@ -1130,6 +1130,11 @@ int platform_pm_restore(struct device *dev)
> 
>  #endif /* CONFIG_HIBERNATE_CALLBACKS */
> 
> +static int platform_dma_configure(struct device *dev) {
> +	return dma_common_configure(dev);
> +}
> +
>  static const struct dev_pm_ops platform_dev_pm_ops = {
>  	.runtime_suspend = pm_generic_runtime_suspend,
>  	.runtime_resume = pm_generic_runtime_resume, @@ -1141,6 +1146,7
> @@ struct bus_type platform_bus_type = {
>  	.dev_groups	= platform_dev_groups,
>  	.match		= platform_match,
>  	.uevent		= platform_uevent,
> +	.dma_configure	= platform_dma_configure,
>  	.pm		= &platform_dev_pm_ops,
>  	.force_dma	= true,
>  };
> diff --git a/drivers/gpu/host1x/bus.c b/drivers/gpu/host1x/bus.c index
> 88a3558..fa9896d 100644
> --- a/drivers/gpu/host1x/bus.c
> +++ b/drivers/gpu/host1x/bus.c
> @@ -314,6 +314,14 @@ static int host1x_device_match(struct device *dev,
> struct device_driver *drv)
>  	return strcmp(dev_name(dev), drv->name) == 0;  }
> 
> +static int host1x_dma_configure(struct device *dev) {
> +	if (dev->of_node)
> +		return of_dma_configure(dev, dev->of_node);
> +
> +	return 0;
> +}
> +
>  static const struct dev_pm_ops host1x_device_pm_ops = {
>  	.suspend = pm_generic_suspend,
>  	.resume = pm_generic_resume,
> @@ -326,6 +334,7 @@ static int host1x_device_match(struct device *dev,
> struct device_driver *drv)  struct bus_type host1x_bus_type = {
>  	.name = "host1x",
>  	.match = host1x_device_match,
> +	.dma_configure	= host1x_dma_configure,
>  	.pm = &host1x_device_pm_ops,
>  	.force_dma = true,
>  };
> diff --git a/drivers/pci/pci-driver.c b/drivers/pci/pci-driver.c index
> 3bed6be..b473a4c 100644
> --- a/drivers/pci/pci-driver.c
> +++ b/drivers/pci/pci-driver.c
> @@ -18,6 +18,8 @@
>  #include <linux/pm_runtime.h>
>  #include <linux/suspend.h>
>  #include <linux/kexec.h>
> +#include <linux/of_device.h>
> +#include <linux/acpi.h>
>  #include "pci.h"
> 
>  struct pci_dynid {
> @@ -1522,6 +1524,35 @@ static int pci_bus_num_vf(struct device *dev)
>  	return pci_num_vf(to_pci_dev(dev));
>  }
> 
> +/**
> + * pci_dma_configure - Setup DMA configuration
> + * @dev: ptr to dev structure
> + *
> + * 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 int pci_dma_configure(struct device *dev) {
> +	struct device *bridge;
> +	enum dev_dma_attr attr;
> +	int ret = 0;
> +
> +	bridge = pci_get_host_bridge_device(to_pci_dev(dev));
> +
> +	if (IS_ENABLED(CONFIG_OF) && bridge->parent &&
> +	    bridge->parent->of_node) {
> +		ret = of_dma_configure(dev, bridge->parent->of_node);
> +	} else if (has_acpi_companion(bridge)) {
> +		attr = acpi_get_dma_attr(to_acpi_device_node(bridge-
> >fwnode));
> +		if (attr != DEV_DMA_NOT_SUPPORTED)
> +			ret = acpi_dma_configure(dev, attr);
> +	}
> +
> +	pci_put_host_bridge_device(bridge);
> +
> +	return ret;
> +}
> +
>  struct bus_type pci_bus_type = {
>  	.name		= "pci",
>  	.match		= pci_bus_match,
> @@ -1534,6 +1565,7 @@ struct bus_type pci_bus_type = {
>  	.drv_groups	= pci_drv_groups,
>  	.pm		= PCI_PM_OPS_PTR,
>  	.num_vf		= pci_bus_num_vf,
> +	.dma_configure	= pci_dma_configure,
>  	.force_dma	= true,
>  };
>  EXPORT_SYMBOL(pci_bus_type);
> diff --git a/include/linux/device.h b/include/linux/device.h index
> b093405..1832d90 100644
> --- a/include/linux/device.h
> +++ b/include/linux/device.h
> @@ -88,6 +88,8 @@ extern int __must_check bus_create_file(struct bus_type
> *,
>   * @resume:	Called to bring a device on this bus out of sleep mode.
>   * @num_vf:	Called to find out how many virtual functions a device on this
>   *		bus supports.
> + * @dma_configure:	Called to setup DMA configuration on a device on
> +			this bus.
>   * @pm:		Power management operations of this bus, callback the
> specific
>   *		device driver's pm-ops.
>   * @iommu_ops:  IOMMU specific operations for this bus, used to attach
> IOMMU @@ -130,6 +132,8 @@ struct bus_type {
> 
>  	int (*num_vf)(struct device *dev);
> 
> +	int (*dma_configure)(struct device *dev);
> +
>  	const struct dev_pm_ops *pm;
> 
>  	const struct iommu_ops *iommu_ops;
> diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h index
> eb9eab4..c15986b 100644
> --- a/include/linux/dma-mapping.h
> +++ b/include/linux/dma-mapping.h
> @@ -761,6 +761,7 @@ void *dma_mark_declared_memory_occupied(struct
> device *dev,  }  #endif /* CONFIG_HAVE_GENERIC_DMA_COHERENT */
> 
> +int dma_common_configure(struct device *dev);
>  #ifdef CONFIG_HAS_DMA
>  int dma_configure(struct device *dev);
>  void dma_deconfigure(struct device *dev);
> --
> 1.9.1

  parent reply	other threads:[~2018-03-21  7:19 UTC|newest]

Thread overview: 48+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-03-12 15:24 [PATCH] " Nipun Gupta
2018-03-12 16:44 ` Sinan Kaya
2018-03-13  4:22   ` Nipun Gupta
2018-03-13  7:27     ` hch
2018-03-13  7:34 ` Christoph Hellwig
2018-03-13 15:59   ` Nipun Gupta
2018-03-14  9:03     ` Christoph Hellwig
2018-03-13 11:35 ` Robin Murphy
2018-03-13 16:11   ` Nipun Gupta
2018-03-14  9:02   ` Christoph Hellwig
2018-03-13 21:53 ` kbuild test robot
2018-03-13 21:53 ` [RFC PATCH] dma-mapping: platform_dma_configure() can be static kbuild test robot
2018-03-14  5:48 ` [dma] 9a019f4251: BUG:unable_to_handle_kernel kernel test robot
2018-03-21  6:55 ` [PATCH v2 1/2] dma-mapping: move dma configuration to bus infrastructure Nipun Gupta
2018-03-21  6:55   ` [PATCH v2 2/2] drivers: remove force dma flag from buses Nipun Gupta
2018-03-21  9:35     ` Greg KH
2018-03-21 16:28       ` Nipun Gupta
2018-03-21 17:49         ` Greg KH
2018-03-22  8:19     ` Christoph Hellwig
2018-03-22 15:13       ` Nipun Gupta
2018-03-23 16:09     ` kbuild test robot
2018-03-23 17:41     ` kbuild test robot
2018-03-21  7:19   ` Bharat Bhushan [this message]
2018-03-21  7:29     ` [PATCH v2 1/2] dma-mapping: move dma configuration to bus infrastructure Nipun Gupta
2018-03-22  8:17     ` hch
2018-03-21  9:29   ` Greg KH
2018-03-21 16:13     ` Nipun Gupta
2018-03-22  8:15   ` Christoph Hellwig
2018-03-22 15:05     ` Nipun Gupta
2018-03-24  9:25   ` kbuild test robot
2018-03-30  7:15 ` [PATCH] " Christoph Hellwig
2018-03-30  7:17   ` Nipun Gupta
2018-03-30  9:05   ` Greg KH
2018-03-30  7:54 ` [PATCH v3 1/2] " Nipun Gupta
2018-03-30  7:54   ` [PATCH v3 2/2] drivers: remove force dma flag from buses Nipun Gupta
2018-04-09 20:27     ` Rob Herring
2018-04-10 19:21     ` Bjorn Helgaas
2018-04-10 19:20   ` [PATCH v3 1/2] dma-mapping: move dma configuration to bus infrastructure Bjorn Helgaas
2018-04-23 12:56     ` Christoph Hellwig
2018-04-23 12:56   ` Christoph Hellwig
2018-04-27 17:10     ` Nipun Gupta
2018-04-28  2:51 ` [PATCH v4 " Nipun Gupta
2018-04-28  2:51   ` [PATCH v4 2/2] drivers: remove force dma flag from buses Nipun Gupta
2018-05-01 12:34     ` Rob Herring
2018-05-03 16:36     ` Vinod Koul
2018-04-30 10:41   ` [PATCH v4 1/2] dma-mapping: move dma configuration to bus infrastructure Thierry Reding
2018-05-03 12:21     ` Christoph Hellwig
2018-05-03 12:21   ` Christoph Hellwig

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=AM5PR0401MB254503027680DE6A23355D909AAA0@AM5PR0401MB2545.eurprd04.prod.outlook.com \
    --to=bharat.bhushan@nxp.com \
    --cc=andy.gross@linaro.org \
    --cc=bhelgaas@google.com \
    --cc=dan.j.williams@intel.com \
    --cc=david.brown@linaro.org \
    --cc=devicetree@vger.kernel.org \
    --cc=dmaengine@vger.kernel.org \
    --cc=dmitry.torokhov@gmail.com \
    --cc=dri-devel@lists.freedesktop.org \
    --cc=frowand.list@gmail.com \
    --cc=gregkh@linuxfoundation.org \
    --cc=hch@lst.de \
    --cc=iommu@lists.linux-foundation.org \
    --cc=jarkko.sakkinen@linux.intel.com \
    --cc=johan@kernel.org \
    --cc=leoyang.li@nxp.com \
    --cc=linux-arm-msm@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-pci@vger.kernel.org \
    --cc=linux-soc@vger.kernel.org \
    --cc=linux-tegra@vger.kernel.org \
    --cc=linux-wireless@vger.kernel.org \
    --cc=linux@armlinux.org.uk \
    --cc=m.szyprowski@samsung.com \
    --cc=msuchanek@suse.de \
    --cc=nipun.gupta@nxp.com \
    --cc=rafael.j.wysocki@intel.com \
    --cc=robh+dt@kernel.org \
    --cc=robin.murphy@arm.com \
    --cc=thierry.reding@gmail.com \
    --cc=vinod.koul@intel.com \
    --cc=zajec5@gmail.com \
    --subject='RE: [PATCH v2 1/2] dma-mapping: move dma configuration to bus infrastructure' \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).