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x86/intel_rdt: Update schemata read to show data in tabular format

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The schemata file displays data from different resources on all
domains. Its cumbersome to read since they are not tabular and data/names
could be of different widths.  Make the schemata file to display data in a
tabular format thereby making it nice and simple to read.

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: peterz@infradead.org
Cc: vikas.shivappa@intel.com
Cc: h.peter.anvin@intel.com
Link: http://lkml.kernel.org/r/1491255857-17213-4-git-send-email-vikas.shivappa@linux.intel.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Vikas Shivappa 2017-04-03 14:44:17 -07:00 committed by Thomas Gleixner
parent c4026b7b95
commit de016df88f
3 changed files with 37 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

4
arch/x86/include/asm/intel_rdt.h
View file

@ -40,6 +40,8 @@ struct rdtgroup {
/* List of all resource groups */
extern struct list_head rdt_all_groups;
extern int max_name_width, max_data_width;
int __init rdtgroup_init(void);
/**
@ -73,6 +75,7 @@ struct rftype {
* @name: Name to use in "schemata" file
* @num_closid: Number of CLOSIDs available
* @max_cbm: Largest Cache Bit Mask allowed
* @data_width: Character width of data when displaying
* @min_cbm_bits: Minimum number of consecutive bits to be set
* in a cache bit mask
* @domains: All domains for this resource
@ -90,6 +93,7 @@ struct rdt_resource {
int cbm_len;
int min_cbm_bits;
u32 max_cbm;
int data_width;
struct list_head domains;
int msr_base;
int cache_level;

30
arch/x86/kernel/cpu/intel_rdt.c
View file

@ -39,6 +39,12 @@ DEFINE_PER_CPU_READ_MOSTLY(int, cpu_closid);
#define domain_init(id) LIST_HEAD_INIT(rdt_resources_all[id].domains)
/*
* Used to store the max resource name width and max resource data width
* to display the schemata in a tabular format
*/
int max_name_width, max_data_width;
struct rdt_resource rdt_resources_all[] = {
{
.name = "L3",
@ -140,6 +146,7 @@ static void rdt_get_config(int idx, struct rdt_resource *r)
r->num_closid = edx.split.cos_max + 1;
r->cbm_len = eax.split.cbm_len + 1;
r->max_cbm = BIT_MASK(eax.split.cbm_len + 1) - 1;
r->data_width = (r->cbm_len + 3) / 4;
r->capable = true;
r->enabled = true;
}
@ -152,6 +159,7 @@ static void rdt_get_cdp_l3_config(int type)
r->num_closid = r_l3->num_closid / 2;
r->cbm_len = r_l3->cbm_len;
r->max_cbm = r_l3->max_cbm;
r->data_width = (r->cbm_len + 3) / 4;
r->capable = true;
/*
* By default, CDP is disabled. CDP can be enabled by mount parameter
@ -160,6 +168,26 @@ static void rdt_get_cdp_l3_config(int type)
r->enabled = false;
}
/**
* Choose a width for the resource name
* and resource data based on the resource that has
* widest name and cbm.
*/
static void rdt_init_padding(void)
{
struct rdt_resource *r;
int cl;
for_each_enabled_rdt_resource(r) {
cl = strlen(r->name);
if (cl > max_name_width)
max_name_width = cl;
if (r->data_width > max_data_width)
max_data_width = r->data_width;
}
}
static inline bool get_rdt_resources(void)
{
bool ret = false;
@ -184,6 +212,8 @@ static inline bool get_rdt_resources(void)
ret = true;
}
rdt_init_padding();
return ret;
}

5
arch/x86/kernel/cpu/intel_rdt_schemata.c
View file

@ -203,11 +203,12 @@ static void show_doms(struct seq_file *s, struct rdt_resource *r, int closid)
struct rdt_domain *dom;
bool sep = false;
seq_printf(s, "%s:", r->name);
seq_printf(s, "%*s:", max_name_width, r->name);
list_for_each_entry(dom, &r->domains, list) {
if (sep)
seq_puts(s, ";");
seq_printf(s, "%d=%x", dom->id, dom->cbm[closid]);
seq_printf(s, "%d=%0*x", dom->id, max_data_width,
dom->cbm[closid]);
sep = true;
}
seq_puts(s, "\n");