On Mon, Jul 25, 2016 at 10:21:10AM -0500, Rob Herring wrote: > On Mon, Jul 25, 2016 at 10:09 AM, Robin Murphy <robin.murphy@xxxxxxx> wrote: > > Hi Lorenzo, > > > > On 20/07/16 12:23, Lorenzo Pieralisi wrote: > >> The iommu_fwspec structure, used to hold per device iommu configuration > >> data is not OF specific and therefore can be moved to a generic > >> and OF independent compilation unit. > >> > >> In particular, the iommu_fwspec handling hinges on the device_node > >> pointer to identify the IOMMU device associated with the iommu_fwspec > >> structure, that is easily converted to a more generic fwnode_handle > >> pointer that can cater for OF and non-OF (ie ACPI) systems. > >> > >> Create the files and related Kconfig entry to decouple iommu_fwspec > >> structure from the OF iommu kernel layer. > >> > >> Given that the current iommu_fwspec implementation relies on > >> the arch specific struct device.archdata.iommu field in its > >> implementation, by making the code standalone and independent > >> of the OF layer this patch makes sure that the iommu_fwspec > >> kernel code can be selected only on arches implementing the > >> struct device.archdata.iommu field by adding an explicit > >> arch dependency in its config entry. > >> > >> Current drivers using the iommu_fwspec for streamid translation > >> are converted to the new iommu_fwspec API by simply converting > >> the device_node to its fwnode_handle pointer. > >> > >> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@xxxxxxx> > >> Cc: Will Deacon <will.deacon@xxxxxxx> > >> Cc: Hanjun Guo <hanjun.guo@xxxxxxxxxx> > >> Cc: Robin Murphy <robin.murphy@xxxxxxx> > >> Cc: Joerg Roedel <joro@xxxxxxxxxx> > >> --- > >> drivers/iommu/Kconfig | 4 ++ > >> drivers/iommu/Makefile | 1 + > >> drivers/iommu/arm-smmu-v3.c | 13 +++-- > >> drivers/iommu/iommu-fwspec.c | 114 +++++++++++++++++++++++++++++++++++++++++++ > >> drivers/iommu/of_iommu.c | 52 -------------------- > >> include/linux/iommu-fwspec.h | 60 +++++++++++++++++++++++ > >> include/linux/of_iommu.h | 24 +++------ > >> 7 files changed, 196 insertions(+), 72 deletions(-) > >> create mode 100644 drivers/iommu/iommu-fwspec.c > >> create mode 100644 include/linux/iommu-fwspec.h > >> > >> diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig > >> index d1c66af..2b26bfb 100644 > >> --- a/drivers/iommu/Kconfig > >> +++ b/drivers/iommu/Kconfig > >> @@ -67,6 +67,10 @@ config OF_IOMMU > >> def_bool y > >> depends on OF && IOMMU_API > >> > >> +config IOMMU_FWSPEC > >> + def_bool y > >> + depends on ARM64 && IOMMU_API > > > > I think that could be at least (ARM || ARM64). > > Why any arch dependency? > > Seems like OF_IOMMU (and ACPI?) should select this. Absolutely, that's the end goal. Current issue is that the iommu_fwspec mechanism relies on dev_archdata.iommu pointer internally to work and since that's arch specific I can't select it on arches that do not have that field, it would break the compilation. I will follow up with Robin to make sure we will be able to implement what you request above. Thanks ! Lorenzo -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
