Commit 859ec80f authored by Wang ShaoBo's avatar Wang ShaoBo Committed by Yang Yingliang
Browse files

ACPI / PPTT: cacheinfo: Label caches based on fw_token 

hulk inclusion
category: feature
bugzilla: 28055
CVE: NA

------------------------------

According to James's implementation: http://www.linux-arm.org/git?p=linux-


jm.git;a=commit;h=413eb4281b072e1ee60f88b814f2a418358f2155, "ACPI / PPTT:
cacheinfo: Label caches based on fw_token".

For resctrl ABI, cache node labeled by min_physid of leaf cpu node can
not be good recognized, for this, we use to label each cache node by
numa node id, it can be acquired by leaf cpu node with min_physid.

But there also has some problems when doing this, with current MPAM ACPI
Description 1.0, we haven't enough information to label those cache node
when using partition mode, we hope fixing that when getting unified des-
cription.

Signed-off-by: default avatarWang ShaoBo <bobo.shaobowang@huawei.com>
Reviewed-By: default avatarXie XiuQi <xiexiuqi@huawei.com>
Signed-off-by: default avatarYang Yingliang <yangyingliang@huawei.com>
parent 2244df4d

arch/arm64/include/asm/acpi.h

+4 −0
Original line number Diff line number Diff line
@@ -113,6 +113,10 @@ static inline u32 get_acpi_id_for_cpu(unsigned int cpu) 


static inline void arch_fix_phys_package_id(int num, u32 slot) { }

void __init acpi_init_cpus(void);

void acpi_pptt_find_min_physid_cpu_node(struct acpi_table_header *table_hdr,

			struct acpi_pptt_processor *cpu_node,

			phys_cpuid_t *min_physid,

			struct acpi_pptt_processor **min_cpu_node);



#else

static inline void acpi_init_cpus(void) { }

drivers/acpi/pptt.c

+55 −0
Original line number Diff line number Diff line
@@ -426,6 +426,61 @@ static struct acpi_pptt_cache *acpi_find_cache_node(struct acpi_table_header *ta 
	return found;

}



/**

 * acpi_pptt_min_physid_from_cpu_node() - Recursivly find @min_physid for all

 * leaf CPUs below @cpu_node.

 * @table_hdr:  Pointer to the head of the PPTT table

 * @cpu_node:   The point in the toplogy to start the walk

 * @min_physid: The min_physid to update with leaf CPUs.

 * @min_cpu_node: The min_cpu_node to update with leaf CPUs.

 */

void acpi_pptt_find_min_physid_cpu_node(struct acpi_table_header *table_hdr,

			struct acpi_pptt_processor *cpu_node,

			phys_cpuid_t *min_physid,

			struct acpi_pptt_processor **min_cpu_node)

{

	bool leaf = true;

	u32 acpi_processor_id;

	phys_cpuid_t cpu_node_phys_id;

	struct acpi_subtable_header *iter;

	struct acpi_pptt_processor *iter_node = NULL;

	u32 target_node = ACPI_PTR_DIFF(cpu_node, table_hdr);

	u32 proc_sz = sizeof(struct acpi_pptt_processor *);

	unsigned long table_end = (unsigned long)table_hdr + table_hdr->length;



	/*

	 * Walk the PPTT, looking for nodes that reference cpu_node

	 * as parent.

	 */

	iter = ACPI_ADD_PTR(struct acpi_subtable_header, table_hdr,

				sizeof(struct acpi_table_pptt));



	while ((unsigned long)iter + proc_sz < table_end) {

		iter_node = (struct acpi_pptt_processor *)iter;



		if (iter->type == ACPI_PPTT_TYPE_PROCESSOR &&

			iter_node->parent == target_node) {

			leaf = false;

			acpi_pptt_find_min_physid_cpu_node(table_hdr, iter_node,

						min_physid, min_cpu_node);

		}



		if (iter->length == 0)

			return;

		iter = ACPI_ADD_PTR(struct acpi_subtable_header, iter,

					iter->length);

	}



	acpi_processor_id = cpu_node->acpi_processor_id;

	cpu_node_phys_id = acpi_id_to_phys_cpuid(acpi_processor_id);

	if (!invalid_phys_cpuid(cpu_node_phys_id) &&

		*min_physid > cpu_node_phys_id &&

		leaf == true) {

		*min_physid = cpu_node_phys_id;

		*min_cpu_node = cpu_node;

	}

}



/**

 * update_cache_properties() - Update cacheinfo for the given processor

 * @this_leaf: Kernel cache info structure being updated