x86/resctrl: Simplify call convention for MSR update functions

The per-resource MSR update functions cat_wrmsr(), mba_wrmsr_intel(),
and mba_wrmsr_amd() all take three arguments:

  (struct rdt_domain *d, struct msr_param *m, struct rdt_resource *r)

struct msr_param contains pointers to both struct rdt_resource and struct
rdt_domain, thus only struct msr_param is necessary.

Pass struct msr_param as a single parameter. Clean up formatting and
fix some fir tree declaration ordering.

No functional change.

Suggested-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Reviewed-by: Babu Moger <babu.moger@amd.com>
Tested-by: Maciej Wieczor-Retman <maciej.wieczor-retman@intel.com>
Link: https://lore.kernel.org/r/20240308213846.77075-3-tony.luck@intel.com

Author: aegl

arch/x86/kernel/cpu/resctrl/core.c

@@ -56,14 +56,9 @@ int max_name_width, max_data_width;
  */
 bool rdt_alloc_capable;
 
-static void
-mba_wrmsr_intel(struct rdt_domain *d, struct msr_param *m,
-		struct rdt_resource *r);
-static void
-cat_wrmsr(struct rdt_domain *d, struct msr_param *m, struct rdt_resource *r);
-static void
-mba_wrmsr_amd(struct rdt_domain *d, struct msr_param *m,
-	      struct rdt_resource *r);
+static void mba_wrmsr_intel(struct msr_param *m);
+static void cat_wrmsr(struct msr_param *m);
+static void mba_wrmsr_amd(struct msr_param *m);
 
 #define domain_init(id) LIST_HEAD_INIT(rdt_resources_all[id].r_resctrl.domains)
 
@@ -309,12 +304,11 @@ static void rdt_get_cdp_l2_config(void)
 	rdt_get_cdp_config(RDT_RESOURCE_L2);
 }
 
-static void
-mba_wrmsr_amd(struct rdt_domain *d, struct msr_param *m, struct rdt_resource *r)
+static void mba_wrmsr_amd(struct msr_param *m)
 {
+	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(m->res);
+	struct rdt_hw_domain *hw_dom = resctrl_to_arch_dom(m->dom);
 	unsigned int i;
-	struct rdt_hw_domain *hw_dom = resctrl_to_arch_dom(d);
-	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
 
 	for (i = m->low; i < m->high; i++)
 		wrmsrl(hw_res->msr_base + i, hw_dom->ctrl_val[i]);
@@ -334,25 +328,22 @@ static u32 delay_bw_map(unsigned long bw, struct rdt_resource *r)
 	return r->default_ctrl;
 }
 
-static void
-mba_wrmsr_intel(struct rdt_domain *d, struct msr_param *m,
-		struct rdt_resource *r)
+static void mba_wrmsr_intel(struct msr_param *m)
 {
+	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(m->res);
+	struct rdt_hw_domain *hw_dom = resctrl_to_arch_dom(m->dom);
 	unsigned int i;
-	struct rdt_hw_domain *hw_dom = resctrl_to_arch_dom(d);
-	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
 
 	/*  Write the delay values for mba. */
 	for (i = m->low; i < m->high; i++)
-		wrmsrl(hw_res->msr_base + i, delay_bw_map(hw_dom->ctrl_val[i], r));
+		wrmsrl(hw_res->msr_base + i, delay_bw_map(hw_dom->ctrl_val[i], m->res));
 }
 
-static void
-cat_wrmsr(struct rdt_domain *d, struct msr_param *m, struct rdt_resource *r)
+static void cat_wrmsr(struct msr_param *m)
 {
+	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(m->res);
+	struct rdt_hw_domain *hw_dom = resctrl_to_arch_dom(m->dom);
 	unsigned int i;
-	struct rdt_hw_domain *hw_dom = resctrl_to_arch_dom(d);
-	struct rdt_hw_resource *hw_res = resctrl_to_arch_res(r);
 
 	for (i = m->low; i < m->high; i++)
 		wrmsrl(hw_res->msr_base + i, hw_dom->ctrl_val[i]);
@@ -384,7 +375,7 @@ void rdt_ctrl_update(void *arg)
 	struct msr_param *m = arg;
 
 	hw_res = resctrl_to_arch_res(m->res);
-	hw_res->msr_update(m->dom, m, m->res);
+	hw_res->msr_update(m);
 }
 
 /*
@@ -457,10 +448,11 @@ static int domain_setup_ctrlval(struct rdt_resource *r, struct rdt_domain *d)
 	hw_dom->ctrl_val = dc;
 	setup_default_ctrlval(r, dc);
 
+	m.res = r;
 	m.dom = d;
 	m.low = 0;
 	m.high = hw_res->num_closid;
-	hw_res->msr_update(d, &m, r);
+	hw_res->msr_update(&m);
 	return 0;
 }
 

arch/x86/kernel/cpu/resctrl/ctrlmondata.c

@@ -289,7 +289,7 @@ int resctrl_arch_update_one(struct rdt_resource *r, struct rdt_domain *d,
 	msr_param.dom = d;
 	msr_param.low = idx;
 	msr_param.high = idx + 1;
-	hw_res->msr_update(d, &msr_param, r);
+	hw_res->msr_update(&msr_param);
 
 	return 0;
 }

arch/x86/kernel/cpu/resctrl/internal.h

@@ -445,8 +445,7 @@ struct rdt_hw_resource {
 	struct rdt_resource	r_resctrl;
 	u32			num_closid;
 	unsigned int		msr_base;
-	void (*msr_update)	(struct rdt_domain *d, struct msr_param *m,
-				 struct rdt_resource *r);
+	void			(*msr_update)(struct msr_param *m);
 	unsigned int		mon_scale;
 	unsigned int		mbm_width;
 	unsigned int		mbm_cfg_mask;