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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 03 Jul 2024 21:49:55.9070 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: bb394016-aa05-4fd5-b993-08dc9baa13e0 X-MS-Exchange-CrossTenant-Id: 3dd8961f-e488-4e60-8e11-a82d994e183d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=3dd8961f-e488-4e60-8e11-a82d994e183d;Ip=[165.204.84.17];Helo=[SATLEXMB04.amd.com] X-MS-Exchange-CrossTenant-AuthSource: DS3PEPF000099DD.namprd04.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: LV8PR12MB9452 Content-Type: text/plain; charset="utf-8" Hardware provides a set of counters when the ABMC feature is supported. These counters are used for enabling the events in resctrl group when the feature is enabled. Introduce mbm_cntrs_free_map bitmap to track available and free counters. Signed-off-by: Babu Moger --- v5: Updated the comments and commit log. Few renames num_cntrs_free_map -> mbm_cntrs_free_map num_cntrs_init -> mbm_cntrs_init Added initialization in rdt_get_tree because the default ABMC enablement happens during the init. v4: Changed the name to num_cntrs where applicable. Used bitmap apis. Added more comments for the globals. v3: Changed the bitmap name to assign_cntrs_free_map. Removed abmc from the name. v2: Changed the bitmap name to assignable_counter_free_map from abmc_counter_free_map. --- arch/x86/kernel/cpu/resctrl/rdtgroup.c | 29 ++++++++++++++++++++++++-- 1 file changed, 27 insertions(+), 2 deletions(-) diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/r= esctrl/rdtgroup.c index 4f47f52e01c2..b3d3fa048f15 100644 --- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c +++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c @@ -185,6 +185,23 @@ bool closid_allocated(unsigned int closid) return !test_bit(closid, &closid_free_map); } =20 +/* + * Counter bitmap and its length for tracking available counters. + * ABMC feature provides set of hardware counters for enabling events. + * Each event takes one hardware counter. Kernel needs to keep track + * of number of available counters. + */ +static unsigned long mbm_cntrs_free_map; +static unsigned int mbm_cntrs_free_map_len; + +static void mbm_cntrs_init(void) +{ + struct rdt_resource *r =3D &rdt_resources_all[RDT_RESOURCE_L3].r_resctrl; + + bitmap_fill(&mbm_cntrs_free_map, r->mon.num_mbm_cntrs); + mbm_cntrs_free_map_len =3D r->mon.num_mbm_cntrs; +} + /** * rdtgroup_mode_by_closid - Return mode of resource group with closid * @closid: closid if the resource group @@ -2466,6 +2483,12 @@ static int _resctrl_abmc_enable(struct rdt_resource = *r, bool enable) { struct rdt_mon_domain *d; =20 + /* + * Clear all the previous assignments while switching the monitor + * mode. + */ + mbm_cntrs_init(); + /* * Hardware counters will reset after switching the monitor mode. * Reset the architectural state so that reading of hardware @@ -2724,10 +2747,10 @@ static void schemata_list_destroy(void) =20 static int rdt_get_tree(struct fs_context *fc) { + struct rdt_resource *r =3D &rdt_resources_all[RDT_RESOURCE_L3].r_resctrl; struct rdt_fs_context *ctx =3D rdt_fc2context(fc); unsigned long flags =3D RFTYPE_CTRL_BASE; struct rdt_mon_domain *dom; - struct rdt_resource *r; int ret; =20 cpus_read_lock(); @@ -2756,6 +2779,9 @@ static int rdt_get_tree(struct fs_context *fc) =20 closid_init(); =20 + if (r->mon.abmc_capable) + mbm_cntrs_init(); + if (resctrl_arch_mon_capable()) flags |=3D RFTYPE_MON; =20 @@ -2800,7 +2826,6 @@ static int rdt_get_tree(struct fs_context *fc) resctrl_mounted =3D true; =20 if (is_mbm_enabled()) { - r =3D &rdt_resources_all[RDT_RESOURCE_L3].r_resctrl; list_for_each_entry(dom, &r->mon_domains, hdr.list) mbm_setup_overflow_handler(dom, MBM_OVERFLOW_INTERVAL, RESCTRL_PICK_ANY_CPU); --=20 2.34.1