[RFC PATCH] arm64: fpsimd: improve stacking logic in non-interruptible context

[Dave Martin]

On Tue, Dec 06, 2016 at 03:39:00PM +0000, Ard Biesheuvel wrote:
> Currently, we allow kernel mode NEON in softirq or hardirq context by
> stacking and unstacking a slice of the NEON register file for each call
> to kernel_neon_begin() and kernel_neon_end(), respectively.
> 
> Given that
> a) a CPU typically spends most of its time in userland, during which time
>    no kernel mode NEON in process context is in progress,
> b) a CPU spends most of its time in the kernel doing other things than
>    kernel mode NEON when it gets interrupted to perform kernel mode NEON
>    in softirq context
> 
> the stacking and subsequent unstacking is only necessary if we are
> interrupting a thread while it is performing kernel mode NEON in process
> context, which means that in all other cases, we can simply preserve the
> userland FPSIMD state once, and only restore it upon return to userland,
> even if we are being invoked from softirq or hardirq context.
> 
> So instead of checking whether we are running in interrupt context, keep
> track of the level of nested kernel mode NEON calls in progress, and only
> perform the eager stack/unstack of the level exceeds 1.

Looks reasonable, and this does avoid treating SVE as a special case.

Later on, we may want to enable SVE use in the kernel too, in which case
kernel_neon_{begin,end}_partial() and fpsimd_partial_state will need
more changes -- but we don't need to address that right now.

Minor comments below.

Cheers
---Dave

> 
> Signed-off-by: Ard Biesheuvel <ard.biesheuvel at linaro.org>
> ---
>  arch/arm64/kernel/fpsimd.c | 40 +++++++++++++++++++++++++++-------------
>  1 file changed, 27 insertions(+), 13 deletions(-)
> 
> diff --git a/arch/arm64/kernel/fpsimd.c b/arch/arm64/kernel/fpsimd.c
> index 394c61db5566..2614a216ac5d 100644
> --- a/arch/arm64/kernel/fpsimd.c
> +++ b/arch/arm64/kernel/fpsimd.c
> @@ -220,20 +220,31 @@ void fpsimd_flush_task_state(struct task_struct *t)
>  
>  #ifdef CONFIG_KERNEL_MODE_NEON
>  
> -static DEFINE_PER_CPU(struct fpsimd_partial_state, hardirq_fpsimdstate);
> -static DEFINE_PER_CPU(struct fpsimd_partial_state, softirq_fpsimdstate);
> +/*
> + * Although unlikely, it is possible for three kernel mode NEON contexts to
> + * be live at the same time: process context, softirq context and hardirq
> + * context. So while the userland context is stashed in the thread's fpsimd
> + * state structure, we need two additional levels of storage.
> + */
> +static DEFINE_PER_CPU(struct fpsimd_partial_state, nested_fpsimdstate[2]);
> +static DEFINE_PER_CPU(int, kernel_neon_nesting_level);
>  
>  /*
>   * Kernel-side NEON support functions
>   */
>  void kernel_neon_begin_partial(u32 num_regs)
>  {
> -	if (in_interrupt()) {
> -		struct fpsimd_partial_state *s = this_cpu_ptr(
> -			in_irq() ? &hardirq_fpsimdstate : &softirq_fpsimdstate);
> +	struct fpsimd_partial_state *s;
> +	int level;
> +
> +	preempt_disable();
> +
> +	level = this_cpu_read(kernel_neon_nesting_level);
> +	if (level > 0) {
> +		s = this_cpu_ptr(nested_fpsimdstate);
>  
>  		BUG_ON(num_regs > 32);
> -		fpsimd_save_partial_state(s, roundup(num_regs, 2));
> +		fpsimd_save_partial_state(&s[level - 1], roundup(num_regs, 2));
>  	} else {
>  		/*
>  		 * Save the userland FPSIMD state if we have one and if we
> @@ -241,24 +252,27 @@ void kernel_neon_begin_partial(u32 num_regs)
>  		 * that there is no longer userland FPSIMD state in the
>  		 * registers.
>  		 */
> -		preempt_disable();
>  		if (current->mm &&
>  		    !test_and_set_thread_flag(TIF_FOREIGN_FPSTATE))
>  			fpsimd_save_state(&current->thread.fpsimd_state);
>  		this_cpu_write(fpsimd_last_state, NULL);
>  	}
> +	this_cpu_write(kernel_neon_nesting_level, level + 1);

Should we BUG_ON overflow/underflow of the nesting level?  That Should
Not Happen (tm), but we'll make a mess if it does.

For the underflow case, perhaps DEBUG_PREEMPT is adequate for detecting
this via preempt count underflow.

>  }
>  EXPORT_SYMBOL(kernel_neon_begin_partial);
>  
>  void kernel_neon_end(void)
>  {
> -	if (in_interrupt()) {
> -		struct fpsimd_partial_state *s = this_cpu_ptr(
> -			in_irq() ? &hardirq_fpsimdstate : &softirq_fpsimdstate);
> -		fpsimd_load_partial_state(s);
> -	} else {
> -		preempt_enable();
> +	struct fpsimd_partial_state *s;
> +	int level;
> +
> +	level = this_cpu_read(kernel_neon_nesting_level);
> +	if (level > 1) {
> +		s = this_cpu_ptr(nested_fpsimdstate);
> +		fpsimd_load_partial_state(&s[level - 2]);
>  	}
> +	this_cpu_write(kernel_neon_nesting_level, level - 1);
> +	preempt_enable();
>  }
>  EXPORT_SYMBOL(kernel_neon_end);
>  
> -- 
> 2.7.4
> 
> 
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel at lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel