Hi Varun,
On Sat, Mar 08, 2014 at 07:05:40PM +0000, Varun Sethi wrote:
> Currently the ARM SMMU driver only considers the bus master devices in the
> device
> tree. The master device and stream ID information is maintained per SMMU.
> Currently
> there is no mechanism for representing this information in case of PCI or hot
> plugged devices.
>
> This RFC patch proposes a mechanism for representing this information for hot
> plugged/PCI devices.
>
> Patch doesn't contain the add_device callback modification for hot plug
> devices.
> This would be bus specific and would be responsible for populating the hot
> plug
> devices masters list for the SMMU.
>
> Signed-off-by: Varun Sethi <[email protected]>
> ---
> drivers/iommu/arm-smmu.c | 93
> ++++++++++++++++++++++++++++++++++++++++++++--
> 1 file changed, 90 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
> index 1d9ab39..6c10df4 100644
> --- a/drivers/iommu/arm-smmu.c
> +++ b/drivers/iommu/arm-smmu.c
> @@ -327,6 +327,9 @@ struct arm_smmu_master {
> * SMMU chain.
> */
> struct rb_node node;
> + /* Following fields correspond to the hot plug masters */
> + struct list_head hotplug_masters_node;
> + struct device *dev;
I'd much rather have one list for all masters. Distinguishing between
masters and `hotplug masters' is unnecessary.
> +static int is_device_hotplug(struct device *dev)
> +{
> + return (dev->bus != &platform_bus_type) &&
> + (dev->bus != &amba_bustype);
> +}
I'm not fond of this. Why not rework what we currently have so that it can
work for other (hotpluggable) buses?
Will
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