Hi Hiroshi,
On Mon, Nov 11, 2013 at 08:31:56AM +0000, Hiroshi Doyu wrote:
> Follow arm,smmu's "mmu-masters" binding.
>
> Signed-off-by: Hiroshi Doyu <[email protected]>
> ---
> Update:
> Newly added for v4. In v3, I used "nvidia,swgroups" and
> "nvidia,memory-clients" bindings.
[...]
> @@ -1151,6 +1152,77 @@ static void tegra_smmu_create_default_map(struct
> smmu_device *smmu)
> }
> }
>
> +static struct smmu_client *find_smmu_client(struct smmu_device *smmu,
> + struct device_node *dev_node)
> +{
> + struct rb_node *node = smmu->clients.rb_node;
> +
> + while (node) {
> + struct smmu_client *client;
> +
> + client = container_of(node, struct smmu_client, node);
> + if (dev_node < client->of_node)
> + node = node->rb_left;
> + else if (dev_node > client->of_node)
> + node = node->rb_right;
> + else
> + return client;
> + }
> +
> + return NULL;
> +}
> +
> +static int insert_smmu_client(struct smmu_device *smmu,
> + struct smmu_client *client)
> +{
> + struct rb_node **new, *parent;
> +
> + new = &smmu->clients.rb_node;
> + parent = NULL;
> + while (*new) {
> + struct smmu_client *this;
> + this = container_of(*new, struct smmu_client, node);
> +
> + parent = *new;
> + if (client->of_node < this->of_node)
> + new = &((*new)->rb_left);
> + else if (client->of_node > this->of_node)
> + new = &((*new)->rb_right);
> + else
> + return -EEXIST;
> + }
> +
> + rb_link_node(&client->node, parent, new);
> + rb_insert_color(&client->node, &smmu->clients);
> + return 0;
> +}
> +
> +static int register_smmu_client(struct smmu_device *smmu,
> + struct device *dev,
> + struct of_phandle_args *args)
> +{
> + struct smmu_client *client;
> + int i;
> +
> + client = find_smmu_client(smmu, args->np);
> + if (client) {
> + dev_err(dev,
> + "rejecting multiple registrations for client device
> %s\n",
> + args->np->full_name);
> + return -EBUSY;
> + }
> +
> + client = devm_kzalloc(dev, sizeof(*client), GFP_KERNEL);
> + if (!client)
> + return -ENOMEM;
> +
> + client->of_node = args->np;
> + for (i = 0; i < args->args_count; i++)
> + client->hwgrp |= 1ULL << args->args[i];
> +
> + return insert_smmu_client(smmu, client);
> +}
This code looks familiar ;)
If this approach makes it past the DT guys, I wonder if there's any scope
for factoring out some of the arm-smmu code so that basic client
parsing/searching/registration can be made into a library?
Will
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