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x86/intel_rdt/mba: Add primary support for Memory Bandwidth Allocation (MBA)

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The MBA feature details like minimum bandwidth supported, bandwidth
granularity etc are obtained via executing CPUID with EAX=10H ,ECX=3.

Setup and initialize the MBA specific extensions to data structures like
global list of RDT resources, RDT resource structure and RDT domain
structure.

[ tglx: Split out the seperate structure and the CBM related parts ]

Signed-off-by: Vikas Shivappa <vikas.shivappa@linux.intel.com>
Cc: ravi.v.shankar@intel.com
Cc: tony.luck@intel.com
Cc: fenghua.yu@intel.com
Cc: vikas.shivappa@intel.com
Link: http://lkml.kernel.org/r/1491611637-20417-5-git-send-email-vikas.shivappa@linux.intel.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Vikas Shivappa
2017-04-07 17:33:53 -07:00
committed by Thomas Gleixner
parent ab66a33b03
commit 05b93417ce
2 changed files with 110 additions and 3 deletions
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24
arch/x86/include/asm/intel_rdt.h
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@@ -12,6 +12,7 @@
#define IA32_L3_QOS_CFG 0xc81
#define IA32_L3_CBM_BASE 0xc90
#define IA32_L2_CBM_BASE 0xd10
#define IA32_MBA_THRTL_BASE 0xd50
#define L3_QOS_CDP_ENABLE 0x01ULL
@@ -119,6 +120,23 @@ struct rdt_cache {
unsigned int cbm_idx_offset;
};
/**
* struct rdt_membw - Memory bandwidth allocation related data
* @max_delay: Max throttle delay. Delay is the hardware
* representation for memory bandwidth.
* @min_bw: Minimum memory bandwidth percentage user can request
* @bw_gran: Granularity at which the memory bandwidth is allocated
* @delay_linear: True if memory B/W delay is in linear scale
* @mb_map: Mapping of memory B/W percentage to memory B/W delay
*/
struct rdt_membw {
u32 max_delay;
u32 min_bw;
u32 bw_gran;
u32 delay_linear;
u32 *mb_map;
};
/**
* struct rdt_resource - attributes of an RDT resource
* @enabled: Is this feature enabled on this machine
@@ -145,7 +163,10 @@ struct rdt_resource {
struct rdt_resource *r);
int data_width;
struct list_head domains;
struct rdt_cache cache;
union {
struct rdt_cache cache;
struct rdt_membw membw;
};
};
extern struct mutex rdtgroup_mutex;
@@ -161,6 +182,7 @@ enum {
RDT_RESOURCE_L3DATA,
RDT_RESOURCE_L3CODE,
RDT_RESOURCE_L2,
RDT_RESOURCE_MBA,
/* Must be the last */
RDT_NUM_RESOURCES,