diff options
| -rw-r--r-- | target/i386/cpu.c | 161 |
1 files changed, 127 insertions, 34 deletions
diff --git a/target/i386/cpu.c b/target/i386/cpu.c index b72b4b08ac..256bfa669f 100644 --- a/target/i386/cpu.c +++ b/target/i386/cpu.c @@ -338,15 +338,68 @@ static void encode_cache_cpuid80000006(CPUCacheInfo *l2, } } +/* + * Definitions used for building CPUID Leaf 0x8000001D and 0x8000001E + * Please refer to the AMD64 Architecture Programmer’s Manual Volume 3. + * Define the constants to build the cpu topology. Right now, TOPOEXT + * feature is enabled only on EPYC. So, these constants are based on + * EPYC supported configurations. We may need to handle the cases if + * these values change in future. + */ +/* Maximum core complexes in a node */ +#define MAX_CCX 2 +/* Maximum cores in a core complex */ +#define MAX_CORES_IN_CCX 4 +/* Maximum cores in a node */ +#define MAX_CORES_IN_NODE 8 +/* Maximum nodes in a socket */ +#define MAX_NODES_PER_SOCKET 4 + +/* + * Figure out the number of nodes required to build this config. + * Max cores in a node is 8 + */ +static int nodes_in_socket(int nr_cores) +{ + int nodes; + + nodes = DIV_ROUND_UP(nr_cores, MAX_CORES_IN_NODE); + + /* Hardware does not support config with 3 nodes, return 4 in that case */ + return (nodes == 3) ? 4 : nodes; +} + +/* + * Decide the number of cores in a core complex with the given nr_cores using + * following set constants MAX_CCX, MAX_CORES_IN_CCX, MAX_CORES_IN_NODE and + * MAX_NODES_PER_SOCKET. Maintain symmetry as much as possible + * L3 cache is shared across all cores in a core complex. So, this will also + * tell us how many cores are sharing the L3 cache. + */ +static int cores_in_core_complex(int nr_cores) +{ + int nodes; + + /* Check if we can fit all the cores in one core complex */ + if (nr_cores <= MAX_CORES_IN_CCX) { + return nr_cores; + } + /* Get the number of nodes required to build this config */ + nodes = nodes_in_socket(nr_cores); + + /* + * Divide the cores accros all the core complexes + * Return rounded up value + */ + return DIV_ROUND_UP(nr_cores, nodes * MAX_CCX); +} + /* Encode cache info for CPUID[8000001D] */ -static void encode_cache_cpuid8000001d(CPUCacheInfo *cache, - X86CPUTopoInfo *topo_info, - uint32_t *eax, uint32_t *ebx, - uint32_t *ecx, uint32_t *edx) +static void encode_cache_cpuid8000001d(CPUCacheInfo *cache, CPUState *cs, + uint32_t *eax, uint32_t *ebx, + uint32_t *ecx, uint32_t *edx) { uint32_t l3_cores; - unsigned nodes = MAX(topo_info->nodes_per_pkg, 1); - assert(cache->size == cache->line_size * cache->associativity * cache->partitions * cache->sets); @@ -355,13 +408,10 @@ static void encode_cache_cpuid8000001d(CPUCacheInfo *cache, /* L3 is shared among multiple cores */ if (cache->level == 3) { - l3_cores = DIV_ROUND_UP((topo_info->dies_per_pkg * - topo_info->cores_per_die * - topo_info->threads_per_core), - nodes); - *eax |= (l3_cores - 1) << 14; + l3_cores = cores_in_core_complex(cs->nr_cores); + *eax |= ((l3_cores * cs->nr_threads) - 1) << 14; } else { - *eax |= ((topo_info->threads_per_core - 1) << 14); + *eax |= ((cs->nr_threads - 1) << 14); } assert(cache->line_size > 0); @@ -381,17 +431,55 @@ static void encode_cache_cpuid8000001d(CPUCacheInfo *cache, (cache->complex_indexing ? CACHE_COMPLEX_IDX : 0); } +/* Data structure to hold the configuration info for a given core index */ +struct core_topology { + /* core complex id of the current core index */ + int ccx_id; + /* + * Adjusted core index for this core in the topology + * This can be 0,1,2,3 with max 4 cores in a core complex + */ + int core_id; + /* Node id for this core index */ + int node_id; + /* Number of nodes in this config */ + int num_nodes; +}; + +/* + * Build the configuration closely match the EPYC hardware. Using the EPYC + * hardware configuration values (MAX_CCX, MAX_CORES_IN_CCX, MAX_CORES_IN_NODE) + * right now. This could change in future. + * nr_cores : Total number of cores in the config + * core_id : Core index of the current CPU + * topo : Data structure to hold all the config info for this core index + */ +static void build_core_topology(int nr_cores, int core_id, + struct core_topology *topo) +{ + int nodes, cores_in_ccx; + + /* First get the number of nodes required */ + nodes = nodes_in_socket(nr_cores); + + cores_in_ccx = cores_in_core_complex(nr_cores); + + topo->node_id = core_id / (cores_in_ccx * MAX_CCX); + topo->ccx_id = (core_id % (cores_in_ccx * MAX_CCX)) / cores_in_ccx; + topo->core_id = core_id % cores_in_ccx; + topo->num_nodes = nodes; +} + /* Encode cache info for CPUID[8000001E] */ -static void encode_topo_cpuid8000001e(X86CPUTopoInfo *topo_info, X86CPU *cpu, +static void encode_topo_cpuid8000001e(CPUState *cs, X86CPU *cpu, uint32_t *eax, uint32_t *ebx, uint32_t *ecx, uint32_t *edx) { - X86CPUTopoIDs topo_ids = {0}; - unsigned long nodes = MAX(topo_info->nodes_per_pkg, 1); + struct core_topology topo = {0}; + unsigned long nodes; int shift; - x86_topo_ids_from_apicid_epyc(cpu->apic_id, topo_info, &topo_ids); - + build_core_topology(cs->nr_cores, cpu->core_id, &topo); *eax = cpu->apic_id; /* * CPUID_Fn8000001E_EBX @@ -408,8 +496,12 @@ static void encode_topo_cpuid8000001e(X86CPUTopoInfo *topo_info, X86CPU *cpu, * 3 Core complex id * 1:0 Core id */ - *ebx = ((topo_info->threads_per_core - 1) << 8) | (topo_ids.node_id << 3) | - (topo_ids.core_id); + if (cs->nr_threads - 1) { + *ebx = ((cs->nr_threads - 1) << 8) | (topo.node_id << 3) | + (topo.ccx_id << 2) | topo.core_id; + } else { + *ebx = (topo.node_id << 4) | (topo.ccx_id << 3) | topo.core_id; + } /* * CPUID_Fn8000001E_ECX * 31:11 Reserved @@ -418,8 +510,9 @@ static void encode_topo_cpuid8000001e(X86CPUTopoInfo *topo_info, X86CPU *cpu, * 2 Socket id * 1:0 Node id */ - if (nodes <= 4) { - *ecx = ((nodes - 1) << 8) | (topo_ids.pkg_id << 2) | topo_ids.node_id; + if (topo.num_nodes <= 4) { + *ecx = ((topo.num_nodes - 1) << 8) | (cpu->socket_id << 2) | + topo.node_id; } else { /* * Node id fix up. Actual hardware supports up to 4 nodes. But with @@ -434,10 +527,10 @@ static void encode_topo_cpuid8000001e(X86CPUTopoInfo *topo_info, X86CPU *cpu, * number of nodes. find_last_bit returns last set bit(0 based). Left * shift(+1) the socket id to represent all the nodes. */ - nodes -= 1; + nodes = topo.num_nodes - 1; shift = find_last_bit(&nodes, 8); - *ecx = (nodes << 8) | (topo_ids.pkg_id << (shift + 1)) | - topo_ids.node_id; + *ecx = ((topo.num_nodes - 1) << 8) | (cpu->socket_id << (shift + 1)) | + topo.node_id; } *edx = 0; } @@ -5471,7 +5564,6 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count, uint32_t signature[3]; X86CPUTopoInfo topo_info; - topo_info.nodes_per_pkg = env->nr_nodes; topo_info.dies_per_pkg = env->nr_dies; topo_info.cores_per_die = cs->nr_cores; topo_info.threads_per_core = cs->nr_threads; @@ -5902,20 +5994,20 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count, } switch (count) { case 0: /* L1 dcache info */ - encode_cache_cpuid8000001d(env->cache_info_amd.l1d_cache, - &topo_info, eax, ebx, ecx, edx); + encode_cache_cpuid8000001d(env->cache_info_amd.l1d_cache, cs, + eax, ebx, ecx, edx); break; case 1: /* L1 icache info */ - encode_cache_cpuid8000001d(env->cache_info_amd.l1i_cache, - &topo_info, eax, ebx, ecx, edx); + encode_cache_cpuid8000001d(env->cache_info_amd.l1i_cache, cs, + eax, ebx, ecx, edx); break; case 2: /* L2 cache info */ - encode_cache_cpuid8000001d(env->cache_info_amd.l2_cache, - &topo_info, eax, ebx, ecx, edx); + encode_cache_cpuid8000001d(env->cache_info_amd.l2_cache, cs, + eax, ebx, ecx, edx); break; case 3: /* L3 cache info */ - encode_cache_cpuid8000001d(env->cache_info_amd.l3_cache, - &topo_info, eax, ebx, ecx, edx); + encode_cache_cpuid8000001d(env->cache_info_amd.l3_cache, cs, + eax, ebx, ecx, edx); break; default: /* end of info */ *eax = *ebx = *ecx = *edx = 0; @@ -5924,7 +6016,8 @@ void cpu_x86_cpuid(CPUX86State *env, uint32_t index, uint32_t count, break; case 0x8000001E: assert(cpu->core_id <= 255); - encode_topo_cpuid8000001e(&topo_info, cpu, eax, ebx, ecx, edx); + encode_topo_cpuid8000001e(cs, cpu, + eax, ebx, ecx, edx); break; case 0xC0000000: *eax = env->cpuid_xlevel2; |