linux-kernel - Re: [PATCH 1/5] perf/x86/intel/uncore: Parse uncore discovery tables

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Date:   Tue, 16 Mar 2021 08:29:44 -0400
From:   "Liang, Kan" <kan.liang@...ux.intel.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     mingo@...nel.org, acme@...hat.com, linux-kernel@...r.kernel.org,
        alexander.shishkin@...ux.intel.com, jolsa@...hat.com,
        eranian@...gle.com, namhyung@...nel.org, ak@...ux.intel.com
Subject: Re: [PATCH 1/5] perf/x86/intel/uncore: Parse uncore discovery tables



On 3/16/2021 7:40 AM, Peter Zijlstra wrote:
> On Fri, Mar 12, 2021 at 08:34:34AM -0800, kan.liang@...ux.intel.com wrote:
>> +static struct intel_uncore_discovery_type *
>> +search_uncore_discovery_type(u16 type_id)
>> +{
>> +	struct rb_node *node = discovery_tables.rb_node;
>> +	struct intel_uncore_discovery_type *type;
>> +
>> +	while (node) {
>> +		type = rb_entry(node, struct intel_uncore_discovery_type, node);
>> +
>> +		if (type->type > type_id)
>> +			node = node->rb_left;
>> +		else if (type->type < type_id)
>> +			node = node->rb_right;
>> +		else
>> +			return type;
>> +	}
>> +
>> +	return NULL;
>> +}
>> +
>> +static struct intel_uncore_discovery_type *
>> +add_uncore_discovery_type(struct uncore_unit_discovery *unit)
>> +{
>> +	struct intel_uncore_discovery_type *type, *cur;
>> +	struct rb_node **node = &discovery_tables.rb_node;
>> +	struct rb_node *parent = *node;
>> +
>> +	if (unit->access_type >= UNCORE_ACCESS_MAX) {
>> +		pr_warn("Unsupported access type %d\n", unit->access_type);
>> +		return NULL;
>> +	}
>> +
>> +	type = kzalloc(sizeof(struct intel_uncore_discovery_type), GFP_KERNEL);
>> +	if (!type)
>> +		return NULL;
>> +
>> +	type->box_ctrl_die = kcalloc(__uncore_max_dies, sizeof(u64), GFP_KERNEL);
>> +	if (!type->box_ctrl_die)
>> +		goto free_type;
>> +
>> +	type->access_type = unit->access_type;
>> +	num_discovered_types[type->access_type]++;
>> +	type->type = unit->box_type;
>> +
>> +	while (*node) {
>> +		parent = *node;
>> +		cur = rb_entry(parent, struct intel_uncore_discovery_type, node);
>> +
>> +		if (cur->type > type->type)
>> +			node = &parent->rb_left;
>> +		else
>> +			node = &parent->rb_right;
>> +	}
>> +
>> +	rb_link_node(&type->node, parent, node);
>> +	rb_insert_color(&type->node, &discovery_tables);
>> +
>> +	return type;
>> +
>> +free_type:
>> +	kfree(type);
>> +
>> +	return NULL;
>> +
>> +}
> 
> I'm thinking this can use some of this:
> 
>    2d24dd5798d0 ("rbtree: Add generic add and find helpers")
> 

Sure, I will use the generic rbtree framework in V2.

Thanks,
Kan