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The CLOSID/RMID association is programmed per CPU via MSR_IA32_PQR_PLZA_ASSOC (0xc00003fc), using RMID/CLOSID values and their respective enable bits. Add the MSR definition and union msr_pqr_plza_assoc to represent the MSR bitfield layout used by subsequent PLZA programming. Signed-off-by: Babu Moger --- v4: Re-wrote the changelog and code comment. v3: No code changes. Patch order changed. Improved changelog. v2: No changes. Just rebasing on top of the latest tip branch. --- arch/x86/include/asm/msr-index.h | 1 + arch/x86/kernel/cpu/resctrl/internal.h | 37 ++++++++++++++++++++++++++ 2 files changed, 38 insertions(+) diff --git a/arch/x86/include/asm/msr-index.h b/arch/x86/include/asm/msr-index.h index 18c4be75e927..2503451a95fe 100644 --- a/arch/x86/include/asm/msr-index.h +++ b/arch/x86/include/asm/msr-index.h @@ -1292,6 +1292,7 @@ /* - AMD: */ #define MSR_IA32_MBA_BW_BASE 0xc0000200 #define MSR_IA32_SMBA_BW_BASE 0xc0000280 +#define MSR_IA32_PQR_PLZA_ASSOC 0xc00003fc #define MSR_IA32_L3_QOS_ABMC_CFG 0xc00003fd #define MSR_IA32_L3_QOS_EXT_CFG 0xc00003ff #define MSR_IA32_EVT_CFG_BASE 0xc0000400 diff --git a/arch/x86/kernel/cpu/resctrl/internal.h b/arch/x86/kernel/cpu/resctrl/internal.h index e3cfa0c10e92..020ebc2c8a1f 100644 --- a/arch/x86/kernel/cpu/resctrl/internal.h +++ b/arch/x86/kernel/cpu/resctrl/internal.h @@ -222,6 +222,43 @@ union l3_qos_abmc_cfg { unsigned long full; }; +/* + * Privilege Level Zero Association (PLZA) is configured by writing to + * MSR_IA32_PQR_PLZA_ASSOC. The MSR must be programmed on every CPU in + * the QoS domain. Each domain supports only one PLZA CLOSID and/or RMID + * association. All fields other than PLZA_EN must hold the same value + * across the domain for consistent operation. + * + * When PLZA_EN is set, the CLOSID/RMID association used at CPL 0 is + * taken from MSR_IA32_PQR_PLZA_ASSOC instead of MSR_IA32_PQR_ASSOC. + * + * @rmid : RMID associated with PLZA. + * @reserved1 : Reserved. + * @rmid_en : Enable RMID association for PLZA. + * @closid : CLOSID associated with PLZA. + * @reserved2 : Reserved. + * @closid_en : Enable CLOSID association for PLZA. + * @reserved3 : Reserved. + * @plza_en : Enable PLZA. When enabled, PLZA applies to the + * given CPU. When PLZA is disabled for a CPU, the + * CLOSID and RMID association defined in the + * PQR_ASSOC MSR applies, regardless of the CPU's + * privilege level. + */ +union msr_pqr_plza_assoc { + struct { + unsigned long rmid :12, + reserved1 :19, + rmid_en : 1, + closid : 4, + reserved2 :11, + closid_en : 1, + reserved3 :15, + plza_en : 1; + } split; + unsigned long full; +}; + void rdt_ctrl_update(void *arg); int rdt_get_l3_mon_config(struct rdt_resource *r); -- 2.43.0