[PATCH v6 10/21] x86/resctrl: Remove architecture copy of mbps_val

James Morse
2022-09-02T15:56:13Z

The resctrl arch code provides a second configuration array mbps_val[]
for the MBA software controller.

Since resctrl switched over to allocating and freeing its own array
when needed, nothing uses the arch code version.

Remove it.

Reviewed-by: Jamie Iles <quic_jiles@quicinc.com>
Tested-by: Xin Hao <xhao@linux.alibaba.com>
Reviewed-by: Shaopeng Tan <tan.shaopeng@fujitsu.com>
Tested-by: Shaopeng Tan <tan.shaopeng@fujitsu.com>
Tested-by: Cristian Marussi <cristian.marussi@arm.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: James Morse <james.morse@arm.com>
---
Changes since v2:
* Made setup_default_ctrlval() static.

Changes since v1:
* Fixed spelling mistake
* Capitalisation
---
arch/x86/kernel/cpu/resctrl/core.c | 20 ++++----------------
arch/x86/kernel/cpu/resctrl/internal.h | 3 ---
arch/x86/kernel/cpu/resctrl/rdtgroup.c | 4 +---
3 files changed, 5 insertions(+), 22 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index f69182973175..f0e2820af475 100644
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -397,7 +397,7 @@ struct rdt_domain *rdt_find_domain(struct rdt_resource *r, int id,
return NULL;
}

-void setup_default_ctrlval(struct rdt_resource *r, u32 *dc, u32 *dm)
+static void setup_default_ctrlval(struct rdt_resource *r, u32 *dc)
{
struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
int i;
@@ -406,18 +406,14 @@ void setup_default_ctrlval(struct rdt_resource *r, u32 *dc, u32 *dm)
* Initialize the Control MSRs to having no control.
* For Cache Allocation: Set all bits in cbm
* For Memory Allocation: Set b/w requested to 100%
- * and the bandwidth in MBps to U32_MAX
*/
- for (i = 0; i < hw_res->num_closid; i++, dc++, dm++) {
+ for (i = 0; i < hw_res->num_closid; i++, dc++)
*dc = r->default_ctrl;
- *dm = MBA_MAX_MBPS;
- }
}

static void domain_free(struct rdt_hw_domain *hw_dom)
{
kfree(hw_dom->ctrl_val);
- kfree(hw_dom->mbps_val);
kfree(hw_dom);
}

@@ -426,23 +422,15 @@ static int domain_setup_ctrlval(struct rdt_resource *r, struct rdt_domain *d)
struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
struct rdt_hw_domain *hw_dom = resctrl_to_arch_dom(d);
struct msr_param m;
- u32 *dc, *dm;
+ u32 *dc;

dc = kmalloc_array(hw_res->num_closid, sizeof(*hw_dom->ctrl_val),
GFP_KERNEL);
if (!dc)
return -ENOMEM;

- dm = kmalloc_array(hw_res->num_closid, sizeof(*hw_dom->mbps_val),
- GFP_KERNEL);
- if (!dm) {
- kfree(dc);
- return -ENOMEM;
- }
-
hw_dom->ctrl_val = dc;
- hw_dom->mbps_val = dm;
- setup_default_ctrlval(r, dc, dm);
+ setup_default_ctrlval(r, dc);

m.low = 0;
m.high = hw_res->num_closid;
diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h
index a7e2cbce29d5..373aaba53ecd 100644
--- a/arch/x86/kernel/cpu/resctrl/internal.h
+++ b/arch/x86/kernel/cpu/resctrl/internal.h
@@ -308,14 +308,12 @@ struct mbm_state {
* a resource
* @d_resctrl: Properties exposed to the resctrl file system
* @ctrl_val: array of cache or mem ctrl values (indexed by CLOSID)
- * @mbps_val: When mba_sc is enabled, this holds the bandwidth in MBps
*
* Members of this structure are accessed via helpers that provide abstraction.
*/
struct rdt_hw_domain {
struct rdt_domain d_resctrl;
u32 *ctrl_val;
- u32 *mbps_val;
};

static inline struct rdt_hw_domain *resctrl_to_arch_dom(struct rdt_domain *r)
@@ -529,7 +527,6 @@ void mbm_setup_overflow_handler(struct rdt_domain *dom,
void mbm_handle_overflow(struct work_struct *work);
void __init intel_rdt_mbm_apply_quirk(void);
bool is_mba_sc(struct rdt_resource *r);
-void setup_default_ctrlval(struct rdt_resource *r, u32 *dc, u32 *dm);
u32 delay_bw_map(unsigned long bw, struct rdt_resource *r);
void cqm_setup_limbo_handler(struct rdt_domain *dom, unsigned long delay_ms);
void cqm_handle_limbo(struct work_struct *work);
diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 55d8a12287c3..6c33dfe7ea53 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -2370,10 +2370,8 @@ static int reset_all_ctrls(struct rdt_resource *r)
hw_dom = resctrl_to_arch_dom(d);
cpumask_set_cpu(cpumask_any(&d->cpu_mask), cpu_mask);

- for (i = 0; i < hw_res->num_closid; i++) {
+ for (i = 0; i < hw_res->num_closid; i++)
hw_dom->ctrl_val[i] = r->default_ctrl;
- hw_dom->mbps_val[i] = MBA_MAX_MBPS;
- }
}
cpu = get_cpu();
/* Update CBM on this cpu if it's in cpu_mask. */
--
2.30.2