x86/resctrl: Calculate the index from the configuration type

resctrl uses cbm_idx() to map a closid to an index in the configuration
array. This is based on a multiplier and offset that are held in the
resource.

To merge the resources, the resctrl arch code needs to calculate the
index from something else, as there will only be one resource.

Decide based on the staged configuration type. This makes the static
mult and offset parameters redundant.

 [ bp: Remove superfluous brackets in get_config_index() ]

Signed-off-by: James Morse <james.morse@arm.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Jamie Iles <jamie@nuviainc.com>
Reviewed-by: Reinette Chatre <reinette.chatre@intel.com>
Tested-by: Babu Moger <babu.moger@amd.com>
Link: https://lkml.kernel.org/r/20210728170637.25610-21-james.morse@arm.com

diff --git a/arch/x86/kernel/cpu/resctrl/core.c b/arch/x86/kernel/cpu/resctrl/core.c
index 990e416..c6b953f 100644 (file)
--- a/arch/x86/kernel/cpu/resctrl/core.c
+++ b/arch/x86/kernel/cpu/resctrl/core.c
@@ -69,8 +69,6 @@ struct rdt_hw_resource rdt_resources_all[] = {
                        .cache_level            = 3,
                        .cache = {
                                .min_cbm_bits   = 1,
-                               .cbm_idx_mult   = 1,
-                               .cbm_idx_offset = 0,
                        },
                        .domains                = domain_init(RDT_RESOURCE_L3),
                        .parse_ctrlval          = parse_cbm,
@@ -89,8 +87,6 @@ struct rdt_hw_resource rdt_resources_all[] = {
                        .cache_level            = 3,
                        .cache = {
                                .min_cbm_bits   = 1,
-                               .cbm_idx_mult   = 2,
-                               .cbm_idx_offset = 0,
                        },
                        .domains                = domain_init(RDT_RESOURCE_L3DATA),
                        .parse_ctrlval          = parse_cbm,
@@ -109,8 +105,6 @@ struct rdt_hw_resource rdt_resources_all[] = {
                        .cache_level            = 3,
                        .cache = {
                                .min_cbm_bits   = 1,
-                               .cbm_idx_mult   = 2,
-                               .cbm_idx_offset = 1,
                        },
                        .domains                = domain_init(RDT_RESOURCE_L3CODE),
                        .parse_ctrlval          = parse_cbm,
@@ -129,8 +123,6 @@ struct rdt_hw_resource rdt_resources_all[] = {
                        .cache_level            = 2,
                        .cache = {
                                .min_cbm_bits   = 1,
-                               .cbm_idx_mult   = 1,
-                               .cbm_idx_offset = 0,
                        },
                        .domains                = domain_init(RDT_RESOURCE_L2),
                        .parse_ctrlval          = parse_cbm,
@@ -149,8 +141,6 @@ struct rdt_hw_resource rdt_resources_all[] = {
                        .cache_level            = 2,
                        .cache = {
                                .min_cbm_bits   = 1,
-                               .cbm_idx_mult   = 2,
-                               .cbm_idx_offset = 0,
                        },
                        .domains                = domain_init(RDT_RESOURCE_L2DATA),
                        .parse_ctrlval          = parse_cbm,
@@ -169,8 +159,6 @@ struct rdt_hw_resource rdt_resources_all[] = {
                        .cache_level            = 2,
                        .cache = {
                                .min_cbm_bits   = 1,
-                               .cbm_idx_mult   = 2,
-                               .cbm_idx_offset = 1,
                        },
                        .domains                = domain_init(RDT_RESOURCE_L2CODE),
                        .parse_ctrlval          = parse_cbm,

diff --git a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
index fdb0e11..92d79c8 100644 (file)
--- a/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
+++ b/arch/x86/kernel/cpu/resctrl/ctrlmondata.c
@@ -246,12 +246,17 @@ next:
        return -EINVAL;
 }
 
-static u32 cbm_idx(struct rdt_resource *r, unsigned int closid)
+static u32 get_config_index(u32 closid, enum resctrl_conf_type type)
 {
-       if (r->rid == RDT_RESOURCE_MBA)
+       switch (type) {
+       default:
+       case CDP_NONE:
                return closid;
-
-       return closid * r->cache.cbm_idx_mult + r->cache.cbm_idx_offset;
+       case CDP_CODE:
+               return closid * 2 + 1;
+       case CDP_DATA:
+               return closid * 2;
+       }
 }
 
 static bool apply_config(struct rdt_hw_domain *hw_dom,
@@ -286,10 +291,6 @@ int resctrl_arch_update_domains(struct rdt_resource *r, u32 closid)
        if (!zalloc_cpumask_var(&cpu_mask, GFP_KERNEL))
                return -ENOMEM;
 
-       msr_param.low = cbm_idx(r, closid);
-       msr_param.high = msr_param.low + 1;
-       msr_param.res = r;
-
        mba_sc = is_mba_sc(r);
        list_for_each_entry(d, &r->domains, list) {
                hw_dom = resctrl_to_arch_dom(d);
@@ -298,9 +299,13 @@ int resctrl_arch_update_domains(struct rdt_resource *r, u32 closid)
                        if (!cfg->have_new_ctrl)
                                continue;
 
-                       idx = cbm_idx(r, closid);
+                       idx = get_config_index(closid, t);
                        if (!apply_config(hw_dom, cfg, idx, cpu_mask, mba_sc))
                                continue;
+
+                       msr_param.low = idx;
+                       msr_param.high = msr_param.low + 1;
+                       msr_param.res = r;
                }
        }
 
@@ -420,7 +425,7 @@ void resctrl_arch_get_config(struct rdt_resource *r, struct rdt_domain *d,
                             u32 closid, enum resctrl_conf_type type, u32 *value)
 {
        struct rdt_hw_domain *hw_dom = resctrl_to_arch_dom(d);
-       u32 idx = cbm_idx(r, closid);
+       u32 idx = get_config_index(closid, type);
 
        if (!is_mba_sc(r))
                *value = hw_dom->ctrl_val[idx];

diff --git a/include/linux/resctrl.h b/include/linux/resctrl.h
index 69d7387..18dd764 100644 (file)
--- a/include/linux/resctrl.h
+++ b/include/linux/resctrl.h
@@ -73,10 +73,6 @@ struct rdt_domain {
  * struct resctrl_cache - Cache allocation related data
  * @cbm_len:           Length of the cache bit mask
  * @min_cbm_bits:      Minimum number of consecutive bits to be set
- * @cbm_idx_mult:      Multiplier of CBM index
- * @cbm_idx_offset:    Offset of CBM index. CBM index is computed by:
- *                     closid * cbm_idx_multi + cbm_idx_offset
- *                     in a cache bit mask
  * @shareable_bits:    Bitmask of shareable resource with other
  *                     executing entities
  * @arch_has_sparse_bitmaps:   True if a bitmap like f00f is valid.
@@ -87,8 +83,6 @@ struct rdt_domain {
 struct resctrl_cache {
        unsigned int    cbm_len;
        unsigned int    min_cbm_bits;
-       unsigned int    cbm_idx_mult;   // TODO remove this
-       unsigned int    cbm_idx_offset; // TODO remove this
        unsigned int    shareable_bits;
        bool            arch_has_sparse_bitmaps;
        bool            arch_has_empty_bitmaps;