[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH v3 1/4] x86: Support enable CDP by boot parameter and add get CDP status
Add boot parameter `psr=cdp` to enable CDP at boot time. Intel Code/Data Prioritization(CDP) feature is based on CAT. Note that cos_max would be half when CDP is on. struct psr_cat_cbm is extended to support CDP operation. Extend psr_get_cat_l3_info sysctl to get CDP status. Signed-off-by: He Chen <he.chen@xxxxxxxxxxxxxxx> --- docs/misc/xen-command-line.markdown | 8 +++- xen/arch/x86/psr.c | 84 ++++++++++++++++++++++++++++++------- xen/arch/x86/sysctl.c | 5 ++- xen/include/asm-x86/msr-index.h | 3 ++ xen/include/asm-x86/psr.h | 11 ++++- xen/include/public/sysctl.h | 2 + 6 files changed, 93 insertions(+), 20 deletions(-) diff --git a/docs/misc/xen-command-line.markdown b/docs/misc/xen-command-line.markdown index a2e427c..8ca1d7f 100644 --- a/docs/misc/xen-command-line.markdown +++ b/docs/misc/xen-command-line.markdown @@ -1165,9 +1165,9 @@ This option can be specified more than once (up to 8 times at present). > `= <integer>` ### psr (Intel) -> `= List of ( cmt:<boolean> | rmid_max:<integer> | cat:<boolean> | cos_max:<integer> )` +> `= List of ( cmt:<boolean> | rmid_max:<integer> | cat:<boolean> | cos_max:<integer> | cdp:<boolean> )` -> Default: `psr=cmt:0,rmid_max:255,cat:0,cos_max:255` +> Default: `psr=cmt:0,rmid_max:255,cat:0,cos_max:255,cdp:0` Platform Shared Resource(PSR) Services. Intel Haswell and later server platforms offer information about the sharing of resources. @@ -1197,6 +1197,10 @@ The following resources are available: the cache allocation. * `cat` instructs Xen to enable/disable Cache Allocation Technology. * `cos_max` indicates the max value for COS ID. +* Code and Data Prioritization Technology (Broadwell and later). Information + regarding the code cache and the data cache allocation. CDP is based on CAT. + * `cdp` instructs Xen to enable/disable Code and Data Prioritization. + ### reboot > `= t[riple] | k[bd] | a[cpi] | p[ci] | P[ower] | e[fi] | n[o] [, [w]arm | > [c]old]` diff --git a/xen/arch/x86/psr.c b/xen/arch/x86/psr.c index c0daa2e..cf70f90 100644 --- a/xen/arch/x86/psr.c +++ b/xen/arch/x86/psr.c @@ -21,9 +21,16 @@ #define PSR_CMT (1<<0) #define PSR_CAT (1<<1) +#define PSR_CDP (1<<2) struct psr_cat_cbm { - uint64_t cbm; + union { + uint64_t cbm; + struct { + uint64_t code; + uint64_t data; + } cdp; + } u; unsigned int ref; }; @@ -43,6 +50,7 @@ struct psr_cmt *__read_mostly psr_cmt; static unsigned long *__read_mostly cat_socket_enable; static struct psr_cat_socket_info *__read_mostly cat_socket_info; +static unsigned long *__read_mostly cdp_socket_enable; static unsigned int __initdata opt_psr; static unsigned int __initdata opt_rmid_max = 255; @@ -94,6 +102,7 @@ static void __init parse_psr_param(char *s) parse_psr_bool(s, val_str, "cmt", PSR_CMT); parse_psr_bool(s, val_str, "cat", PSR_CAT); + parse_psr_bool(s, val_str, "cdp", PSR_CDP); if ( val_str && !strcmp(s, "rmid_max") ) opt_rmid_max = simple_strtoul(val_str, NULL, 0); @@ -262,7 +271,7 @@ static struct psr_cat_socket_info *get_cat_socket_info(unsigned int socket) } int psr_get_cat_l3_info(unsigned int socket, uint32_t *cbm_len, - uint32_t *cos_max) + uint32_t *cos_max, uint32_t *flags) { struct psr_cat_socket_info *info = get_cat_socket_info(socket); @@ -272,6 +281,10 @@ int psr_get_cat_l3_info(unsigned int socket, uint32_t *cbm_len, *cbm_len = info->cbm_len; *cos_max = info->cos_max; + *flags = 0; + if ( test_bit(socket, cdp_socket_enable) ) + *flags |= PSR_CAT_FLAG_L3_CDP; + return 0; } @@ -282,7 +295,7 @@ int psr_get_l3_cbm(struct domain *d, unsigned int socket, uint64_t *cbm) if ( IS_ERR(info) ) return PTR_ERR(info); - *cbm = info->cos_to_cbm[d->arch.psr_cos_ids[socket]].cbm; + *cbm = info->cos_to_cbm[d->arch.psr_cos_ids[socket]].u.cbm; return 0; } @@ -313,19 +326,34 @@ static bool_t psr_check_cbm(unsigned int cbm_len, uint64_t cbm) struct cos_cbm_info { unsigned int cos; - uint64_t cbm; + uint64_t cbm_code; + uint64_t cbm_data; + bool_t cdp; }; static void do_write_l3_cbm(void *data) { struct cos_cbm_info *info = data; - wrmsrl(MSR_IA32_PSR_L3_MASK(info->cos), info->cbm); + if ( info->cdp ) + { + wrmsrl(MSR_IA32_PSR_L3_MASK_CODE(info->cos), info->cbm_code); + wrmsrl(MSR_IA32_PSR_L3_MASK_DATA(info->cos), info->cbm_data); + } + else + wrmsrl(MSR_IA32_PSR_L3_MASK(info->cos), info->cbm_code); } -static int write_l3_cbm(unsigned int socket, unsigned int cos, uint64_t cbm) +static int write_l3_cbm(unsigned int socket, unsigned int cos, + uint64_t cbm_code, uint64_t cbm_data, bool_t cdp) { - struct cos_cbm_info info = { .cos = cos, .cbm = cbm }; + struct cos_cbm_info info = + { + .cos = cos, + .cbm_code = cbm_code, + .cbm_data = cbm_data, + .cdp = cdp, + }; if ( socket == cpu_to_socket(smp_processor_id()) ) do_write_l3_cbm(&info); @@ -363,7 +391,7 @@ int psr_set_l3_cbm(struct domain *d, unsigned int socket, uint64_t cbm) /* If still not found, then keep unused one. */ if ( !found && cos != 0 && map[cos].ref == 0 ) found = map + cos; - else if ( map[cos].cbm == cbm ) + else if ( map[cos].u.cbm == cbm ) { if ( unlikely(cos == old_cos) ) { @@ -387,16 +415,16 @@ int psr_set_l3_cbm(struct domain *d, unsigned int socket, uint64_t cbm) } cos = found - map; - if ( found->cbm != cbm ) + if ( found->u.cbm != cbm ) { - int ret = write_l3_cbm(socket, cos, cbm); + int ret = write_l3_cbm(socket, cos, cbm, 0, 0); if ( ret ) { spin_unlock(&info->cbm_lock); return ret; } - found->cbm = cbm; + found->u.cbm = cbm; } found->ref++; @@ -470,6 +498,7 @@ static void cat_cpu_init(void) struct psr_cat_socket_info *info; unsigned int socket; unsigned int cpu = smp_processor_id(); + uint64_t val; const struct cpuinfo_x86 *c = cpu_data + cpu; if ( !cpu_has(c, X86_FEATURE_CAT) || c->cpuid_level < PSR_CPUID_LEVEL_CAT ) @@ -490,13 +519,33 @@ static void cat_cpu_init(void) info->cos_to_cbm = temp_cos_to_cbm; temp_cos_to_cbm = NULL; /* cos=0 is reserved as default cbm(all ones). */ - info->cos_to_cbm[0].cbm = (1ull << info->cbm_len) - 1; + info->cos_to_cbm[0].u.cbm = (1ull << info->cbm_len) - 1; spin_lock_init(&info->cbm_lock); set_bit(socket, cat_socket_enable); - printk(XENLOG_INFO "CAT: enabled on socket %u, cos_max:%u, cbm_len:%u\n", - socket, info->cos_max, info->cbm_len); + + if ( (ecx & PSR_CAT_CDP_CAPABILITY) && (opt_psr & PSR_CDP) ) + { + if ( test_bit(socket, cdp_socket_enable) ) + return; + + rdmsrl(MSR_IA32_PSR_L3_QOS_CFG, val); + wrmsrl(MSR_IA32_PSR_L3_QOS_CFG, val | 1 << PSR_L3_QOS_CDP_ENABLE_BIT); + + info->cos_to_cbm[0].u.cdp.code = (1ull << info->cbm_len) - 1; + info->cos_to_cbm[0].u.cdp.data = (1ull << info->cbm_len) - 1; + + /* We only write mask1 since mask0 is always all ones by default */ + wrmsrl(MSR_IA32_PSR_L3_MASK(1), (1ull << info->cbm_len) - 1); + + /* Cut half of cos_max when CDP enabled */ + info->cos_max = info->cos_max / 2; + + set_bit(socket, cdp_socket_enable); + printk(XENLOG_INFO "CDP: enabled on socket %u, cos_max:%u, cbm_len:%u\n", + socket, info->cos_max, info->cbm_len); + } } } @@ -508,6 +557,8 @@ static void cat_cpu_fini(unsigned int cpu) { struct psr_cat_socket_info *info = cat_socket_info + socket; + clear_bit(socket, cdp_socket_enable); + if ( info->cos_to_cbm ) { xfree(info->cos_to_cbm); @@ -523,6 +574,8 @@ static void __init psr_cat_free(void) cat_socket_enable = NULL; xfree(cat_socket_info); cat_socket_info = NULL; + xfree(cdp_socket_enable); + cdp_socket_enable = NULL; } static void __init init_psr_cat(void) @@ -535,8 +588,9 @@ static void __init init_psr_cat(void) cat_socket_enable = xzalloc_array(unsigned long, BITS_TO_LONGS(nr_sockets)); cat_socket_info = xzalloc_array(struct psr_cat_socket_info, nr_sockets); + cdp_socket_enable = xzalloc_array(unsigned long, BITS_TO_LONGS(nr_sockets)); - if ( !cat_socket_enable || !cat_socket_info ) + if ( !cat_socket_enable || !cat_socket_info || !cdp_socket_enable ) psr_cat_free(); } diff --git a/xen/arch/x86/sysctl.c b/xen/arch/x86/sysctl.c index f36b52f..e42c5e7 100644 --- a/xen/arch/x86/sysctl.c +++ b/xen/arch/x86/sysctl.c @@ -177,12 +177,13 @@ long arch_do_sysctl( case XEN_SYSCTL_PSR_CAT_get_l3_info: ret = psr_get_cat_l3_info(sysctl->u.psr_cat_op.target, &sysctl->u.psr_cat_op.u.l3_info.cbm_len, - &sysctl->u.psr_cat_op.u.l3_info.cos_max); + &sysctl->u.psr_cat_op.u.l3_info.cos_max, + &sysctl->u.psr_cat_op.u.l3_info.flags); if ( !ret && __copy_field_to_guest(u_sysctl, sysctl, u.psr_cat_op) ) ret = -EFAULT; - break; + default: ret = -EOPNOTSUPP; break; diff --git a/xen/include/asm-x86/msr-index.h b/xen/include/asm-x86/msr-index.h index e9c4723..9149b20 100644 --- a/xen/include/asm-x86/msr-index.h +++ b/xen/include/asm-x86/msr-index.h @@ -328,7 +328,10 @@ #define MSR_IA32_CMT_EVTSEL 0x00000c8d #define MSR_IA32_CMT_CTR 0x00000c8e #define MSR_IA32_PSR_ASSOC 0x00000c8f +#define MSR_IA32_PSR_L3_QOS_CFG 0x00000c81 #define MSR_IA32_PSR_L3_MASK(n) (0x00000c90 + (n)) +#define MSR_IA32_PSR_L3_MASK_CODE(n) (0x00000c90 + (n * 2 + 1)) +#define MSR_IA32_PSR_L3_MASK_DATA(n) (0x00000c90 + (n * 2)) /* Intel Model 6 */ #define MSR_P6_PERFCTR(n) (0x000000c1 + (n)) diff --git a/xen/include/asm-x86/psr.h b/xen/include/asm-x86/psr.h index 081750f..422b053 100644 --- a/xen/include/asm-x86/psr.h +++ b/xen/include/asm-x86/psr.h @@ -27,6 +27,15 @@ /* L3 Monitoring Features */ #define PSR_CMT_L3_OCCUPANCY 0x1 +/* CDP Capability */ +#define PSR_CAT_CDP_CAPABILITY (1u << 2) + +/* L3 CDP Enable bit*/ +#define PSR_L3_QOS_CDP_ENABLE_BIT 0x0 + +/* L3 CDP flag bit */ +#define PSR_CAT_FLAG_L3_CDP (1u << 0) + struct psr_cmt_l3 { unsigned int features; unsigned int upscaling_factor; @@ -52,7 +61,7 @@ void psr_free_rmid(struct domain *d); void psr_ctxt_switch_to(struct domain *d); int psr_get_cat_l3_info(unsigned int socket, uint32_t *cbm_len, - uint32_t *cos_max); + uint32_t *cos_max, uint32_t *flags); int psr_get_l3_cbm(struct domain *d, unsigned int socket, uint64_t *cbm); int psr_set_l3_cbm(struct domain *d, unsigned int socket, uint64_t cbm); diff --git a/xen/include/public/sysctl.h b/xen/include/public/sysctl.h index 58c9be2..4102cd2 100644 --- a/xen/include/public/sysctl.h +++ b/xen/include/public/sysctl.h @@ -704,6 +704,8 @@ struct xen_sysctl_psr_cat_op { struct { uint32_t cbm_len; /* OUT: CBM length */ uint32_t cos_max; /* OUT: Maximum COS */ + #define XEN_SYSCTL_PSR_CAT_L3_CDP (1u << 0) + uint32_t flags; /* OUT: CAT flags */ } l3_info; } u; }; -- 1.9.1 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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