[PATCH 00/22] x86: Enhance MTRR functionality to support multiple CPUs

[Andy Shevchenko]

On Thu, May 21, 2020 at 08:23:04PM -0600, Simon Glass wrote:
> At present MTRRs are mirrored to the secondary CPUs only once, as those
> CPUs are started up. But U-Boot may add more MTRRs later, e.g. if it
> decides that a video console must be set up.
> 
> This series enhances the x86 multi-processor support to allow MTRRs to
> be updated at any time. It also updates the 'mtrr' command to support
> setting the MTRRs on CPUs other than the boot CPU.

Hmm... Why do you need MTRR if CPU supports PAT?

> 
> 
> Simon Glass (22):
>   x86: mp_init: Switch to livetree
>   x86: Move MP code into mp_init
>   x86: mp_init: Avoid declarations in header files
>   x86: mp_init: Switch parameter names in start_aps()
>   x86: mp_init: Drop the num_cpus static variable
>   x86: mtrr: Fix 'ensable' typo
>   x86: mp_init: Set up the CPU numbers at the start
>   x86: mp_init: Adjust bsp_init() to return more information
>   x86: cpu: Remove unnecessary #ifdefs
>   x86: mp: Support APs waiting for instructions
>   global_data: Add a generic global_data flag for SMP state
>   x86: Set the SMP flag when MP init is complete
>   x86: mp: Allow running functions on multiple CPUs
>   x86: mp: Park CPUs before running the OS
>   x86: mp: Add iterators for CPUs
>   x86: mtrr: Use MP calls to list the MTRRs
>   x86: mtrr: Update MTRRs on all CPUs
>   x86: mtrr: Add support for writing to MTRRs on any CPU
>   x86: mtrr: Update the command to use the new mtrr calls
>   x86: mtrr: Restructure so command execution is in one place
>   x86: mtrr: Update 'mtrr' to allow setting MTRRs on any CPU
>   x86: mtrr: Enhance 'mtrr' command to list MTRRs on any CPU
> 
>  arch/x86/cpu/cpu.c                |  63 ++---
>  arch/x86/cpu/i386/cpu.c           |  26 +--
>  arch/x86/cpu/mp_init.c            | 377 +++++++++++++++++++++++++-----
>  arch/x86/cpu/mtrr.c               | 149 ++++++++++++
>  arch/x86/include/asm/mp.h         | 118 ++++++++--
>  arch/x86/include/asm/mtrr.h       |  51 ++++
>  cmd/x86/mtrr.c                    | 148 ++++++++----
>  include/asm-generic/global_data.h |   1 +
>  include/dm/uclass.h               |   2 +-
>  9 files changed, 751 insertions(+), 184 deletions(-)
> 
> -- 
> 2.27.0.rc0.183.gde8f92d652-goog
> 

-- 
With Best Regards,
Andy Shevchenko