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X-OriginatorOrg: amd.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 01 Dec 2023 00:57:43.8402 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 0a0c02a4-1594-44d9-1ec0-08dbf20886d8 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: SN1PEPF000252A2.namprd05.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: CH3PR12MB9282 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" AMD Hardware provides 32 ABMC(Bandwidth Monitoring Event Configuration) counters when supported. These hardware counters are used to assign (or pin) the RMID to the group. Introduce the bitmap abmc_free_map to allocate and free counters. Signed-off-by: Babu Moger --- arch/x86/kernel/cpu/resctrl/rdtgroup.c | 24 +++++++++++++++++++++++- 1 file changed, 23 insertions(+), 1 deletion(-) diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/r= esctrl/rdtgroup.c index edb679b22b7b..f72d6d8c12df 100644 --- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c +++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c @@ -164,6 +164,22 @@ static bool closid_allocated(unsigned int closid) return (closid_free_map & (1 << closid)) =3D=3D 0; } =20 +static u64 abmc_free_map; +static u32 abmc_free_map_len; + +static void abmc_counters_init(void) +{ + struct rdt_hw_resource *hw_res =3D &rdt_resources_all[RDT_RESOURCE_L3]; + + if (hw_res->abmc_counters > 64) { + hw_res->abmc_counters =3D 64; + WARN(1, "Cannot support more than 64 abmc counters\n"); + } + + abmc_free_map =3D BIT_MASK(hw_res->abmc_counters) - 1; + abmc_free_map_len =3D hw_res->abmc_counters; +} + /** * rdtgroup_mode_by_closid - Return mode of resource group with closid * @closid: closid if the resource group @@ -2715,6 +2731,7 @@ static int rdt_get_tree(struct fs_context *fc) { struct rdt_fs_context *ctx =3D rdt_fc2context(fc); unsigned long flags =3D RFTYPE_CTRL_BASE; + struct rdt_hw_resource *hw_res; struct rdt_domain *dom; struct rdt_resource *r; int ret; @@ -2745,6 +2762,12 @@ static int rdt_get_tree(struct fs_context *fc) =20 closid_init(); =20 + r =3D &rdt_resources_all[RDT_RESOURCE_L3].r_resctrl; + hw_res =3D resctrl_to_arch_res(r); + + if (r->abmc_capable && hw_res->abmc_enabled) + abmc_counters_init(); + if (rdt_mon_capable) flags |=3D RFTYPE_MON; =20 @@ -2789,7 +2812,6 @@ static int rdt_get_tree(struct fs_context *fc) static_branch_enable_cpuslocked(&rdt_enable_key); =20 if (is_mbm_enabled()) { - r =3D &rdt_resources_all[RDT_RESOURCE_L3].r_resctrl; list_for_each_entry(dom, &r->domains, list) mbm_setup_overflow_handler(dom, MBM_OVERFLOW_INTERVAL); } --=20 2.34.1