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x86/intel_rdt: Add command line options for resource director technology 

Command line options allow us to ignore features that we don't want.
Also we can re-enable options that have been disabled on a platform
(so long as the underlying h/w actually supports the option).

[ tglx: Marked the option array __initdata and the helper function __init ]

Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Fenghua" <fenghua.yu@intel.com>
Cc: Ravi V" <ravi.v.shankar@intel.com>
Cc: "Peter Zijlstra" <peterz@infradead.org>
Cc: "Stephane Eranian" <eranian@google.com>
Cc: "Andi Kleen" <ak@linux.intel.com>
Cc: "David Carrillo-Cisneros" <davidcc@google.com>
Cc: Vikas Shivappa <vikas.shivappa@linux.intel.com>
Link: http://lkml.kernel.org/r/0c37b0d4dbc30977a3c1cee08b66420f83662694.1503512900.git.tony.luck@intel.com
This commit is contained in:
Tony Luck 2017-08-24 09:26:51 -07:00 committed by Thomas Gleixner
parent 0576113a38
commit 1d9807fc64
3 changed files with 95 additions and 8 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
Documentation/admin-guide/kernel-parameters.rst
View File

@ -138,6 +138,7 @@ parameter is applicable::
PPT Parallel port support is enabled.
PS2 Appropriate PS/2 support is enabled.
RAM RAM disk support is enabled.
RDT Intel Resource Director Technology.
S390 S390 architecture is enabled.
SCSI Appropriate SCSI support is enabled.
A lot of drivers have their options described inside

6
Documentation/admin-guide/kernel-parameters.txt
View File

@ -3598,6 +3598,12 @@
Run specified binary instead of /init from the ramdisk,
used for early userspace startup. See initrd.
rdt= [HW,X86,RDT]
Turn on/off individual RDT features. List is:
cmt, mbmtotal, mbmlocal, l3cat, l3cdp, l2cat, mba.
E.g. to turn on cmt and turn off mba use:
rdt=cmt,!mba
reboot= [KNL]
Format (x86 or x86_64):
[w[arm] | c[old] | h[ard] | s[oft] | g[pio]] \

96
arch/x86/kernel/cpu/intel_rdt.c
View File

@ -637,6 +637,85 @@ static __init void rdt_init_padding(void)
}
}
enum {
RDT_FLAG_CMT,
RDT_FLAG_MBM_TOTAL,
RDT_FLAG_MBM_LOCAL,
RDT_FLAG_L3_CAT,
RDT_FLAG_L3_CDP,
RDT_FLAG_L2_CAT,
RDT_FLAG_MBA,
};
#define RDT_OPT(idx, n, f) \
[idx] = { \
.name = n, \
.flag = f \
}
struct rdt_options {
char *name;
int flag;
bool force_off, force_on;
};
static struct rdt_options rdt_options[] __initdata = {
RDT_OPT(RDT_FLAG_CMT, "cmt", X86_FEATURE_CQM_OCCUP_LLC),
RDT_OPT(RDT_FLAG_MBM_TOTAL, "mbmtotal", X86_FEATURE_CQM_MBM_TOTAL),
RDT_OPT(RDT_FLAG_MBM_LOCAL, "mbmlocal", X86_FEATURE_CQM_MBM_LOCAL),
RDT_OPT(RDT_FLAG_L3_CAT, "l3cat", X86_FEATURE_CAT_L3),
RDT_OPT(RDT_FLAG_L3_CDP, "l3cdp", X86_FEATURE_CDP_L3),
RDT_OPT(RDT_FLAG_L2_CAT, "l2cat", X86_FEATURE_CAT_L2),
RDT_OPT(RDT_FLAG_MBA, "mba", X86_FEATURE_MBA),
};
#define NUM_RDT_OPTIONS ARRAY_SIZE(rdt_options)
static int __init set_rdt_options(char *str)
{
struct rdt_options *o;
bool force_off;
char *tok;
if (*str == '=')
str++;
while ((tok = strsep(&str, ",")) != NULL) {
force_off = *tok == '!';
if (force_off)
tok++;
for (o = rdt_options; o < &rdt_options[NUM_RDT_OPTIONS]; o++) {
if (strcmp(tok, o->name) == 0) {
if (force_off)
o->force_off = true;
else
o->force_on = true;
break;
}
}
}
return 1;
}
__setup("rdt", set_rdt_options);
static bool __init rdt_cpu_has(int flag)
{
bool ret = boot_cpu_has(flag);
struct rdt_options *o;
if (!ret)
return ret;
for (o = rdt_options; o < &rdt_options[NUM_RDT_OPTIONS]; o++) {
if (flag == o->flag) {
if (o->force_off)
ret = false;
if (o->force_on)
ret = true;
break;
}
}
return ret;
}
static __init bool get_rdt_alloc_resources(void)
{
bool ret = false;
@ -647,21 +726,21 @@ static __init bool get_rdt_alloc_resources(void)
if (!boot_cpu_has(X86_FEATURE_RDT_A))
return false;
if (boot_cpu_has(X86_FEATURE_CAT_L3)) {
if (rdt_cpu_has(X86_FEATURE_CAT_L3)) {
rdt_get_cache_alloc_cfg(1, &rdt_resources_all[RDT_RESOURCE_L3]);
if (boot_cpu_has(X86_FEATURE_CDP_L3)) {
if (rdt_cpu_has(X86_FEATURE_CDP_L3)) {
rdt_get_cdp_l3_config(RDT_RESOURCE_L3DATA);
rdt_get_cdp_l3_config(RDT_RESOURCE_L3CODE);
}
ret = true;
}
if (boot_cpu_has(X86_FEATURE_CAT_L2)) {
if (rdt_cpu_has(X86_FEATURE_CAT_L2)) {
/* CPUID 0x10.2 fields are same format at 0x10.1 */
rdt_get_cache_alloc_cfg(2, &rdt_resources_all[RDT_RESOURCE_L2]);
ret = true;
}
if (boot_cpu_has(X86_FEATURE_MBA)) {
if (rdt_cpu_has(X86_FEATURE_MBA)) {
if (rdt_get_mem_config(&rdt_resources_all[RDT_RESOURCE_MBA]))
ret = true;
}
@ -670,11 +749,11 @@ static __init bool get_rdt_alloc_resources(void)
static __init bool get_rdt_mon_resources(void)
{
if (boot_cpu_has(X86_FEATURE_CQM_OCCUP_LLC))
if (rdt_cpu_has(X86_FEATURE_CQM_OCCUP_LLC))
rdt_mon_features |= (1 << QOS_L3_OCCUP_EVENT_ID);
if (boot_cpu_has(X86_FEATURE_CQM_MBM_TOTAL))
if (rdt_cpu_has(X86_FEATURE_CQM_MBM_TOTAL))
rdt_mon_features |= (1 << QOS_L3_MBM_TOTAL_EVENT_ID);
if (boot_cpu_has(X86_FEATURE_CQM_MBM_LOCAL))
if (rdt_cpu_has(X86_FEATURE_CQM_MBM_LOCAL))
rdt_mon_features |= (1 << QOS_L3_MBM_LOCAL_EVENT_ID);
if (!rdt_mon_features)
@ -687,7 +766,8 @@ static __init void rdt_quirks(void)
{
switch (boot_cpu_data.x86_model) {
case INTEL_FAM6_HASWELL_X:
cache_alloc_hsw_probe();
if (!rdt_options[RDT_FLAG_L3_CAT].force_off)
cache_alloc_hsw_probe();
break;
}
}