On Wed, Apr 03, 2019 at 08:21:46PM +0200, Geert Uytterhoeven wrote:
> The maximum number of micro-TLBs per IPMMU instance is not fixed, but
> depends on the SoC type. Hence move it from struct ipmmu_vmsa_device to
> struct ipmmu_features, and set up the correct value for both R-Car Gen2
> and Gen3 SoCs.
>
> Note that currently no code uses this value.
>
> Signed-off-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
> Reviewed-by: Laurent Pinchart <laurent.pinchart@xxxxxxxxxxxxxxxx>
Are there any plans to use num_utlbs in the driver or anywhere else in the
kernel? If not, perhaps it should be removed?
> ---
> v2:
> - Add Reviewed-by.
> ---
> drivers/iommu/ipmmu-vmsa.c | 5 +++--
> 1 file changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/iommu/ipmmu-vmsa.c b/drivers/iommu/ipmmu-vmsa.c
> index 87acf86f295fac0d..3fa57627b1e35562 100644
> --- a/drivers/iommu/ipmmu-vmsa.c
> +++ b/drivers/iommu/ipmmu-vmsa.c
> @@ -42,6 +42,7 @@ struct ipmmu_features {
> bool use_ns_alias_offset;
> bool has_cache_leaf_nodes;
> unsigned int number_of_contexts;
> + unsigned int num_utlbs;
> bool setup_imbuscr;
> bool twobit_imttbcr_sl0;
> bool reserved_context;
> @@ -53,7 +54,6 @@ struct ipmmu_vmsa_device {
> struct iommu_device iommu;
> struct ipmmu_vmsa_device *root;
> const struct ipmmu_features *features;
> - unsigned int num_utlbs;
> unsigned int num_ctx;
> spinlock_t lock; /* Protects ctx and domains[] */
> DECLARE_BITMAP(ctx, IPMMU_CTX_MAX);
> @@ -972,6 +972,7 @@ static const struct ipmmu_features ipmmu_features_default = {
> .use_ns_alias_offset = true,
> .has_cache_leaf_nodes = false,
> .number_of_contexts = 1, /* software only tested with one context */
> + .num_utlbs = 32,
> .setup_imbuscr = true,
> .twobit_imttbcr_sl0 = false,
> .reserved_context = false,
> @@ -981,6 +982,7 @@ static const struct ipmmu_features ipmmu_features_rcar_gen3 = {
> .use_ns_alias_offset = false,
> .has_cache_leaf_nodes = true,
> .number_of_contexts = 8,
> + .num_utlbs = 48,
> .setup_imbuscr = false,
> .twobit_imttbcr_sl0 = true,
> .reserved_context = true,
> @@ -1033,7 +1035,6 @@ static int ipmmu_probe(struct platform_device *pdev)
> }
>
> mmu->dev = &pdev->dev;
> - mmu->num_utlbs = 48;
> spin_lock_init(&mmu->lock);
> bitmap_zero(mmu->ctx, IPMMU_CTX_MAX);
> mmu->features = of_device_get_match_data(&pdev->dev);
> --
> 2.17.1
>
