Now that we've explained arch_needs_linear to resctrl, the parse_bw()
calls are almost the same between AMD and Intel.
The difference is '!is_mba_sc()', which is not checked on AMD. This
will always be true on AMD CPUs as mba_sc cannot be enabled as
is_mba_linear() is false.
Removing this duplication means user-space visible behaviour and
error messages are not validated or generated in different places.
Signed-off-by: James Morse <[email protected]>
---
arch/x86/kernel/cpu/resctrl/core.c | 4 +-
arch/x86/kernel/cpu/resctrl/ctrlmondata.c | 55 +----------------------
arch/x86/kernel/cpu/resctrl/internal.h | 6 +--
3 files changed, 5 insertions(+), 60 deletions(-)
diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index f022dc823c53..e90c10ca85f4 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -924,7 +924,7 @@ static __init void rdt_init_res_defs_intel(void)
else if (r->rid == RDT_RESOURCE_MBA) {
r->msr_base = MSR_IA32_MBA_THRTL_BASE;
r->msr_update = mba_wrmsr_intel;
- r->parse_ctrlval = parse_bw_intel;
+ r->parse_ctrlval = parse_bw;
}
}
}
@@ -944,7 +944,7 @@ static __init void rdt_init_res_defs_amd(void)
else if (r->rid == RDT_RESOURCE_MBA) {
r->msr_base = MSR_IA32_MBA_BW_BASE;
r->msr_update = mba_wrmsr_amd;
- r->parse_ctrlval = parse_bw_amd;
+ r->parse_ctrlval = parse_bw;
}
}
}
diff --git a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
index db8e6c0cadb1..416becb591d1 100644
--- a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
+++ b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
@@ -21,59 +21,6 @@
#include <linux/slab.h>
#include "internal.h"
-/*
- * Check whether MBA bandwidth percentage value is correct. The value is
- * checked against the minimum and maximum bandwidth values specified by
- * the hardware. The allocated bandwidth percentage is rounded to the next
- * control step available on the hardware.
- */
-static bool bw_validate_amd(char *buf, unsigned long *data,
- struct rdt_resource *r)
-{
- unsigned long bw;
- int ret;
-
- /* temporary: always false on AMD */
- if (!r->membw.delay_linear && r->membw.arch_needs_linear) {
- rdt_last_cmd_puts("No support for non-linear MB domains\n");
- return false;
- }
-
- ret = kstrtoul(buf, 10, &bw);
- if (ret) {
- rdt_last_cmd_printf("Non-decimal digit in MB value %s\n", buf);
- return false;
- }
-
- if (bw < r->membw.min_bw || bw > r->default_ctrl) {
- rdt_last_cmd_printf("MB value %ld out of range [%d,%d]\n", bw,
- r->membw.min_bw, r->default_ctrl);
- return false;
- }
-
- *data = roundup(bw, (unsigned long)r->membw.bw_gran);
- return true;
-}
-
-int parse_bw_amd(struct rdt_parse_data *data, struct rdt_resource *r,
- struct rdt_domain *d)
-{
- unsigned long bw_val;
-
- if (d->have_new_ctrl) {
- rdt_last_cmd_printf("Duplicate domain %d\n", d->id);
- return -EINVAL;
- }
-
- if (!bw_validate_amd(data->buf, &bw_val, r))
- return -EINVAL;
-
- d->new_ctrl = bw_val;
- d->have_new_ctrl = true;
-
- return 0;
-}
-
/*
* Check whether MBA bandwidth percentage value is correct. The value is
* checked against the minimum and max bandwidth values specified by the
@@ -110,7 +57,7 @@ static bool bw_validate(char *buf, unsigned long *data, struct rdt_resource *r)
return true;
}
-int parse_bw_intel(struct rdt_parse_data *data, struct rdt_resource *r,
+int parse_bw(struct rdt_parse_data *data, struct rdt_resource *r,
struct rdt_domain *d)
{
unsigned long bw_val;
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index 1fa692c54e15..45fc695081d1 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -462,10 +462,8 @@ struct rdt_resource {
int parse_cbm(struct rdt_parse_data *data, struct rdt_resource *r,
struct rdt_domain *d);
-int parse_bw_intel(struct rdt_parse_data *data, struct rdt_resource *r,
- struct rdt_domain *d);
-int parse_bw_amd(struct rdt_parse_data *data, struct rdt_resource *r,
- struct rdt_domain *d);
+int parse_bw(struct rdt_parse_data *data, struct rdt_resource *r,
+ struct rdt_domain *d);
extern struct mutex rdtgroup_mutex;
--
2.24.1
Hi James,
On 2/14/2020 10:23 AM, James Morse wrote:
> Now that we've explained arch_needs_linear to resctrl, the parse_bw()
> calls are almost the same between AMD and Intel.
>
> The difference is '!is_mba_sc()', which is not checked on AMD. This
> will always be true on AMD CPUs as mba_sc cannot be enabled as
> is_mba_linear() is false.
>
> Removing this duplication means user-space visible behaviour and
> error messages are not validated or generated in different places.
>
> Signed-off-by: James Morse <[email protected]>
> ---
> arch/x86/kernel/cpu/resctrl/core.c | 4 +-
> arch/x86/kernel/cpu/resctrl/ctrlmondata.c | 55 +----------------------
> arch/x86/kernel/cpu/resctrl/internal.h | 6 +--
> 3 files changed, 5 insertions(+), 60 deletions(-)
>
> diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
> index f022dc823c53..e90c10ca85f4 100644
> --- a/arch/x86/kernel/cpu/resctrl/core.c
> +++ b/arch/x86/kernel/cpu/resctrl/core.c
> @@ -924,7 +924,7 @@ static __init void rdt_init_res_defs_intel(void)
> else if (r->rid == RDT_RESOURCE_MBA) {
> r->msr_base = MSR_IA32_MBA_THRTL_BASE;
> r->msr_update = mba_wrmsr_intel;
> - r->parse_ctrlval = parse_bw_intel;
> + r->parse_ctrlval = parse_bw;
> }
> }
> }
> @@ -944,7 +944,7 @@ static __init void rdt_init_res_defs_amd(void)
> else if (r->rid == RDT_RESOURCE_MBA) {
> r->msr_base = MSR_IA32_MBA_BW_BASE;
> r->msr_update = mba_wrmsr_amd;
> - r->parse_ctrlval = parse_bw_amd;
> + r->parse_ctrlval = parse_bw;
> }
> }
> }
Now that these values are identical more duplication can be avoided by
moving the initialization to earlier where rdt_resources_all[] is
initialized. Could you please modify this patch to do so?
> diff --git a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
> index db8e6c0cadb1..416becb591d1 100644
> --- a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
> +++ b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
> @@ -21,59 +21,6 @@
> #include <linux/slab.h>
> #include "internal.h"
>
> -/*
> - * Check whether MBA bandwidth percentage value is correct. The value is
> - * checked against the minimum and maximum bandwidth values specified by
> - * the hardware. The allocated bandwidth percentage is rounded to the next
> - * control step available on the hardware.
> - */
> -static bool bw_validate_amd(char *buf, unsigned long *data,
> - struct rdt_resource *r)
> -{
> - unsigned long bw;
> - int ret;
> -
> - /* temporary: always false on AMD */
> - if (!r->membw.delay_linear && r->membw.arch_needs_linear) {
> - rdt_last_cmd_puts("No support for non-linear MB domains\n");
> - return false;
> - }
> -
> - ret = kstrtoul(buf, 10, &bw);
> - if (ret) {
> - rdt_last_cmd_printf("Non-decimal digit in MB value %s\n", buf);
> - return false;
> - }
> -
> - if (bw < r->membw.min_bw || bw > r->default_ctrl) {
> - rdt_last_cmd_printf("MB value %ld out of range [%d,%d]\n", bw,
> - r->membw.min_bw, r->default_ctrl);
> - return false;
> - }
> -
> - *data = roundup(bw, (unsigned long)r->membw.bw_gran);
> - return true;
> -}
> -
> -int parse_bw_amd(struct rdt_parse_data *data, struct rdt_resource *r,
> - struct rdt_domain *d)
> -{
> - unsigned long bw_val;
> -
> - if (d->have_new_ctrl) {
> - rdt_last_cmd_printf("Duplicate domain %d\n", d->id);
> - return -EINVAL;
> - }
> -
> - if (!bw_validate_amd(data->buf, &bw_val, r))
> - return -EINVAL;
> -
> - d->new_ctrl = bw_val;
> - d->have_new_ctrl = true;
> -
> - return 0;
> -}
> -
> /*
> * Check whether MBA bandwidth percentage value is correct. The value is
> * checked against the minimum and max bandwidth values specified by the
> @@ -110,7 +57,7 @@ static bool bw_validate(char *buf, unsigned long *data, struct rdt_resource *r)
> return true;
> }
>
> -int parse_bw_intel(struct rdt_parse_data *data, struct rdt_resource *r,
> +int parse_bw(struct rdt_parse_data *data, struct rdt_resource *r,
> struct rdt_domain *d)
This change affects the alignment here ... could you please fix the
alignment to match open parenthesis?
> {
> unsigned long bw_val;
> diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
> index 1fa692c54e15..45fc695081d1 100644
> --- a/arch/x86/kernel/cpu/resctrl/internal.h
> +++ b/arch/x86/kernel/cpu/resctrl/internal.h
> @@ -462,10 +462,8 @@ struct rdt_resource {
>
> int parse_cbm(struct rdt_parse_data *data, struct rdt_resource *r,
> struct rdt_domain *d);
> -int parse_bw_intel(struct rdt_parse_data *data, struct rdt_resource *r,
> - struct rdt_domain *d);
> -int parse_bw_amd(struct rdt_parse_data *data, struct rdt_resource *r,
> - struct rdt_domain *d);
> +int parse_bw(struct rdt_parse_data *data, struct rdt_resource *r,
> + struct rdt_domain *d);
>
> extern struct mutex rdtgroup_mutex;
>
>
Babu may want to take a look also.
Thank you
Reinette