[0/2] irqchip/gic-v3-its: Use CMA for its table allocation

Message

Robert Richter Nov. 15, 2018, 9:50 p.m. UTC

The gicv3-its device table may have a size of up to 16MB (Cavium
ThunderX). With 4k pagesize the maximum size of memory allocation is
4MB. This series implements the use of CMA for allocation of large its
tables. To achieve this we need to make an its node a kernel device
(patch #1) and rework the its table allocation code (patch #2). Both
can only be done after the arch_initcall and thus this patch series
bases on my previous series that implements late its initialization:

      https://patchwork.kernel.org/cover/10673117/

Using its nodes as kernel devices has the side effect to ease the
release of resources (devres used) and device based messages (dev_*
printk variants used).

The new its table allocator still uses the old scheme for small tables
to allow a further rework that supports NUMA-aware its tables.

Robert Richter (2):
  irqchip/gic-v3-its: Handle its nodes as kernel devices
  irqchip/gic-v3-its: Use CMA for allocation of large device tables

 drivers/irqchip/irq-gic-v3-its.c | 224 +++++++++++++++++++++++----------------
 1 file changed, 135 insertions(+), 89 deletions(-)

Comments

Richter, Robert Nov. 28, 2018, 2:47 p.m. UTC | #1

On 15.11.18 22:50:57, Richter, Robert wrote:
> The gicv3-its device table may have a size of up to 16MB (Cavium
> ThunderX). With 4k pagesize the maximum size of memory allocation is
> 4MB. This series implements the use of CMA for allocation of large its
> tables. To achieve this we need to make an its node a kernel device
> (patch #1) and rework the its table allocation code (patch #2). Both
> can only be done after the arch_initcall and thus this patch series
> bases on my previous series that implements late its initialization:
> 
>       https://patchwork.kernel.org/cover/10673117/

I just sent out v2 of that series:

 https://patchwork.kernel.org/cover/10702781/

This series should be still compatible.

Any comments to this series?

Thanks,

-Robert

> 
> Using its nodes as kernel devices has the side effect to ease the
> release of resources (devres used) and device based messages (dev_*
> printk variants used).
> 
> The new its table allocator still uses the old scheme for small tables
> to allow a further rework that supports NUMA-aware its tables.
> 
> Robert Richter (2):
>   irqchip/gic-v3-its: Handle its nodes as kernel devices
>   irqchip/gic-v3-its: Use CMA for allocation of large device tables
> 
>  drivers/irqchip/irq-gic-v3-its.c | 224 +++++++++++++++++++++++----------------
>  1 file changed, 135 insertions(+), 89 deletions(-)
> 
> -- 
> 2.11.0
>