lkml.org 
[lkml]   [2013]   [Dec]   [12]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
Date
From
SubjectRe: [PATCHv7 04/12] driver/core: populate devices in order for IOMMUs
On Thu, Dec 12, 2013 at 11:39:20AM +0000, Grant Likely wrote:
> On Thu, 12 Dec 2013 09:57:05 +0200, Hiroshi Doyu <hdoyu@nvidia.com> wrote:
> > IOMMU devices on the bus need to be poplulated first, then iommu
> > master devices are done later.
> >
> > With CONFIG_OF_IOMMU, "iommus=" DT binding would be used to identify
> > whether a device can be an iommu msater or not. If a device can, we'll
> > defer to populate that device till an iommu device is populated. Then,
> > those deferred iommu master devices are populated and configured with
> > help of the already populated iommu device.
> >
> > Signed-off-by: Hiroshi Doyu <hdoyu@nvidia.com>
> > Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> > ---
> > This is related to the following discussion:
> > [RFC PATCH] Documentation: devicetree: add description for generic bus properties
> > http://lists.infradead.org/pipermail/linux-arm-kernel/2013-November/215042.html
> >
> > v6:
> > Spinned off only driver core part from:
> > [PATCHv5 2/9] driver/core: populate devices in order for IOMMUs
> >
> > v5:
> > Use "iommus=" binding instread of arm,smmu's "#stream-id-cells".
> >
> > v4:
> > This is newly added, and the successor of the following RFC:
> > [RFC][PATCHv3+ 1/2] driver/core: Add of_iommu_attach()
> > http://lists.linuxfoundation.org/pipermail/iommu/2013-November/006914.html
> >
> > Signed-off-by: Hiroshi Doyu <hdoyu@nvidia.com>
> > ---
> > drivers/base/dd.c | 5 +++++
> > 1 file changed, 5 insertions(+)
> >
> > diff --git a/drivers/base/dd.c b/drivers/base/dd.c
> > index 0605176..0605f52 100644
> > --- a/drivers/base/dd.c
> > +++ b/drivers/base/dd.c
> > @@ -25,6 +25,7 @@
> > #include <linux/async.h>
> > #include <linux/pm_runtime.h>
> > #include <linux/pinctrl/devinfo.h>
> > +#include <linux/of_iommu.h>
> >
> > #include "base.h"
> > #include "power/power.h"
> > @@ -273,6 +274,10 @@ static int really_probe(struct device *dev, struct device_driver *drv)
> >
> > dev->driver = drv;
> >
> > + ret = of_iommu_attach(dev);
> > + if (ret)
> > + goto probe_failed;
> > +
>
> As discussed before, I really don't think hooking in to dd.c is the
> right thing to do here, and certainly not as a device tree specific
> function. ACPI or PCI described devices may have the same constraints
> and those won't have DT descriptions.

I agree, this shouldn't be in the driver core.

greg k-h


\
 
 \ /
  Last update: 2013-12-13 04:21    [W:0.193 / U:0.228 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site