Commit cecf6c62 authored by Wang ShaoBo's avatar Wang ShaoBo Committed by Zheng Zengkai
Browse files

arm64/mpam: resctrl: Append schemata CDP definitions 

hulk inclusion
category: feature
feature: ARM MPAM support
bugzilla: 48265
CVE: NA

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

CDP (Code and Data Prioritization) should also be supported, because
separate code and data caches is an illusion resctrl creates using
CDP, as James said, The L2 cache is controlled from one place regardless.
Arm doesn't specify a cache topology. Platforms may have separate L2
code and data caches, with independent controls. On such a system
we would need a unified L2 cache to be an illusion. To support Arm's
MPAM, we need CDP to not be implicit between the architecture code
and the file-system code. this add a series definitions independent
of resctrl resources.

To do this we make the code/data/both 'type' a property of the
configuration that comes from the schema. This lets us combined the
illusionary cache. Eventually we separate the architecture code and
file-system code's idea of closid, the architecture code can then
provide helpers to map one to the other.

Part of this code is borrowed to James's, See links.

Link: http://www.linux-arm.org/git?p=linux-jm.git;a=commit;h=57a6f6204f72e2afc116721b2b86451fa19a32a6
Link: http://www.linux-arm.org/git?p=linux-jm.git;a=commit;h=1385052cce87a8aed5dc0e96967cedd9e74a17e0


Signed-off-by: default avatarWang ShaoBo <bobo.shaobowang@huawei.com>
Reviewed-by: default avatarXiongfeng Wang <wangxiongfeng2@huawei.com>
Reviewed-by: default avatarCheng Jian <cj.chengjian@huawei.com>
Signed-off-by: default avatarYang Yingliang <yangyingliang@huawei.com>
Signed-off-by: default avatarZheng Zengkai <zhengzengkai@huawei.com>
parent aeffdf37

arch/arm64/include/asm/mpam.h

+91 −0
Original line number Diff line number Diff line
@@ -120,6 +120,97 @@ extern bool rdt_mon_capable; 


extern int max_name_width, max_data_width;



enum resctrl_conf_type {

	CDP_BOTH = 0,

	CDP_CODE,

	CDP_DATA,

	CDP_NUM_CONF_TYPE,

};



static inline int conf_name_to_conf_type(char *name)

{

	enum resctrl_conf_type t;



	if (!strcmp(name, "L3CODE") || !strcmp(name, "L2CODE"))

		t = CDP_CODE;

	else if (!strcmp(name, "L3DATA") || !strcmp(name, "L2DATA"))

		t = CDP_DATA;

	else

		t = CDP_BOTH;

	return t;

}



#define for_each_conf_type(t) \

		for (t = CDP_BOTH; t < CDP_NUM_CONF_TYPE; t++)



typedef struct { u16 val; } hw_mpamid_t;



#define hw_closid_t hw_mpamid_t

#define hw_monid_t hw_mpamid_t

#define hw_closid_val(__x) (__x.val)

#define hw_monid_val(__x) (__x.val)



#define as_hw_t(__name, __x) \

			((hw_##__name##id_t){(__x)})

#define hw_val(__name, __x) \

			hw_##__name##id_val(__x)



/**

 * When cdp enabled, give (closid + 1) to Cache LxDATA.

 */

#define resctrl_cdp_map(__name, __closid, __type, __result)    \

do {   \

	if (__type == CDP_CODE) \

		__result = as_hw_t(__name, __closid); \

	else if (__type == CDP_DATA)     \

		__result = as_hw_t(__name, __closid + 1); \

	else    \

		__result = as_hw_t(__name, __closid); \

} while (0)



static inline bool is_resctrl_cdp_enabled(void)

{

	return 0;

}



#define hw_alloc_times_validate(__name, __times, __flag) \

do {   \

	__flag = is_resctrl_cdp_enabled();	\

	__times = flag ? 2 : 1;	\

} while (0)





/**

 * struct resctrl_staged_config - parsed configuration to be applied

 * @hw_closid:      raw closid for this configuration, regardless of CDP

 * @new_ctrl:       new ctrl value to be loaded

 * @have_new_ctrl:  did user provide new_ctrl for this domain

 * @new_ctrl_type:  CDP property of the new ctrl

 */

struct resctrl_staged_config {

	hw_closid_t     hw_closid;

	u32             new_ctrl;

	bool            have_new_ctrl;

	enum resctrl_conf_type  new_ctrl_type;

};



/* later move to resctrl common directory */

#define RESCTRL_NAME_LEN    7



/**

 * @list:   Member of resctrl's schema list

 * @name:   Name visible in the schemata file

 * @conf_type:  Type of configuration, e.g. code/data/both

 * @res:    The rdt_resource for this entry

 */

struct resctrl_schema {

	struct list_head        list;

	char                    name[RESCTRL_NAME_LEN];

	enum resctrl_conf_type      conf_type;

	struct resctrl_resource     *res;

};





/* rdtgroup.flags */

#define	RDT_DELETED		BIT(0)

#define	RDT_CTRLMON		BIT(1)