Re: [PATCH v3 09/13] iommu/arm-smmu-v3: Handle failure of arm_smmu_write_ctx_desc()

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Hi Jean,

On 12/9/19 7:05 PM, Jean-Philippe Brucker wrote:
> Second-level context descriptor tables will be allocated lazily in
> arm_smmu_write_ctx_desc(). Help with handling allocation failure by
> moving the CD write into arm_smmu_domain_finalise_s1().

nit: would rather change the title to something like "Prepare for
arm_smmu_write_ctx_desc() failure"
> 
> Signed-off-by: Jean-Philippe Brucker <jean-philippe@xxxxxxxxxx>
Reviewed-by: Eric Auger <eric.auger@xxxxxxxxxx>

Thanks

Eric

> ---
>  drivers/iommu/arm-smmu-v3.c | 11 +++++++----
>  1 file changed, 7 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c
> index f260abadde6d..fc5119f34187 100644
> --- a/drivers/iommu/arm-smmu-v3.c
> +++ b/drivers/iommu/arm-smmu-v3.c
> @@ -2301,8 +2301,15 @@ static int arm_smmu_domain_finalise_s1(struct arm_smmu_domain *smmu_domain,
>  	cfg->cd.ttbr	= pgtbl_cfg->arm_lpae_s1_cfg.ttbr[0];
>  	cfg->cd.tcr	= pgtbl_cfg->arm_lpae_s1_cfg.tcr;
>  	cfg->cd.mair	= pgtbl_cfg->arm_lpae_s1_cfg.mair;
> +
> +	ret = arm_smmu_write_ctx_desc(smmu_domain, 0, &cfg->cd);
> +	if (ret)
> +		goto out_free_tables;
> +
>  	return 0;
>  
> +out_free_tables:
> +	arm_smmu_free_cd_tables(smmu_domain);
>  out_free_asid:
>  	arm_smmu_bitmap_free(smmu->asid_map, asid);
>  	return ret;
> @@ -2569,10 +2576,6 @@ static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev)
>  	if (smmu_domain->stage != ARM_SMMU_DOMAIN_BYPASS)
>  		master->ats_enabled = arm_smmu_ats_supported(master);
>  
> -	if (smmu_domain->stage == ARM_SMMU_DOMAIN_S1)
> -		arm_smmu_write_ctx_desc(smmu_domain, 0,
> -					&smmu_domain->s1_cfg.cd);
> -
>  	arm_smmu_install_ste_for_dev(master);
>  
>  	spin_lock_irqsave(&smmu_domain->devices_lock, flags);
> 




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