Re: [PATCH 05/10] iommu/amd: remove the special case from get_irq_table()

[Sebastian Andrzej Siewior]

On 2018-03-15 13:53:42 [+0100], Joerg Roedel wrote:
> On Fri, Feb 23, 2018 at 11:27:31PM +0100, Sebastian Andrzej Siewior wrote:
> > @@ -4103,10 +4093,26 @@ static int irq_remapping_alloc(struct irq_domain *domain, unsigned int virq,
> >  		return ret;
> >  
> >  	if (info->type == X86_IRQ_ALLOC_TYPE_IOAPIC) {
> > -		if (get_irq_table(devid, true))
> > +		struct irq_remap_table *table;
> > +		struct amd_iommu *iommu;
> > +
> > +		table = get_irq_table(devid);
> > +		if (table) {
> > +			if (!table->min_index) {
> > +				/*
> > +				 * Keep the first 32 indexes free for IOAPIC
> > +				 * interrupts.
> > +				 */
> > +				table->min_index = 32;
> > +				iommu = amd_iommu_rlookup_table[devid];
> > +				for (i = 0; i < 32; ++i)
> > +					iommu->irte_ops->set_allocated(table, i);
> > +			}
> 
> I think this needs to be protected by the table->lock.

Which part any why? The !->min_index part plus extending(setting to 32)?

Sebastian