Re: [PATCH] xen/arm: gic-v3: Implement correctly the callback send_SGI

[Ian Campbell <ian.campbell@citrix.com>]

On Mon, 2015-04-27 at 19:31 +0100, Julien Grall wrote:
> Currently, the GICv3 drivers is only able to send an SGI when the cpumask

"driver"

> is provided. Although with the modes SGI_TARGET_OTHERS and SGI_TARGET_SELF,
> no cpumask is provided. Any usage of those modes will crash the hypersivor.
> 
> Move the rename gicv3_send_sgi to gicv3_send_sgi_list and implement the

s/Move the r/R/

> different modes:
>     - SGI_TARGET_OTHERS: Set the Interrupt Routing Mode (bit 40) to 1
>     (see Table 4 on Section 4.2.6 PRD03-GENC-010745 24.0)
>     - SGI_TARGET_SELF: Contrawise GICv2, the SGI registers doesn't provide

"Contrariwise"? But I think you really mean "Unlike". I'd also say "the
GICv3 SGI registers" and s/doesn't/don't/.


>     a specific field. So use gicv3_send_sgi_list and pass the cpumask of
>     the current CPU
>     - SGI_TARGET_LIST: Directly call gicv3_send_sgi_list with the given
>     cpumask
> 
> Reported-by: Chen Baozi <baozich@gmail.com>
> Signed-off-by: Julien Grall <julien.grall@citrix.com>

Apart from the commit message nits one code comment:

[...]
> +    case SGI_TARGET_OTHERS:
> +        WRITE_SYSREG(ICH_SGI_TARGET_OTHERS << ICH_SGI_IRQMODE_SHIFT |
> +                     (register_t)sgi << ICH_SGI_IRQ_SHIFT,

I don't think you want register_t here, unless ICC_SGI1R_EL1 might be a
different width on different architectures.

I think you should just cast to uint64_t and WRITE_SYSREG64.

Ian.