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authorAaron Durbin <adurbin@chromium.org>2013-05-28 14:26:29 -0500
committerRonald G. Minnich <rminnich@gmail.com>2013-06-03 17:30:48 +0200
commit66da043e48c65e6d89b385d840e5f7c53e482db9 (patch)
tree08a1e3acfa427d8c8d71b417a6cd15554248a25a /src
parent27435d3bcdd4c7bccb326f77ca64a54d3fb1170a (diff)
haswell: allow for disabled hyperthreading
There were assumptions being made in the haswell MP and SMM code which assumed the APIC id space was 1:1 w.r.t. cpu number. When hyperthreading is disabled the APIC ids of the logical processors are all even. That means the APIC id space is sparse. Handle this situation. Change-Id: Ibe79ab156c0a171208a77db8a252aa5b73205d6c Signed-off-by: Aaron Durbin <adurbin@chromium.org> Reviewed-on: http://review.coreboot.org/3353 Tested-by: build bot (Jenkins) Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net> Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
Diffstat (limited to 'src')
-rw-r--r--src/cpu/intel/haswell/haswell.h3
-rw-r--r--src/cpu/intel/haswell/mp_init.c22
-rw-r--r--src/cpu/intel/haswell/smmrelocate.c32
3 files changed, 51 insertions, 6 deletions
diff --git a/src/cpu/intel/haswell/haswell.h b/src/cpu/intel/haswell/haswell.h
index c550cfa1a6..4a739a9e30 100644
--- a/src/cpu/intel/haswell/haswell.h
+++ b/src/cpu/intel/haswell/haswell.h
@@ -175,6 +175,9 @@ int setup_ap_init(struct bus *cpu_bus, int *max_cpus,
/* Returns 0 on success, < 0 on failure. */
int start_aps(struct bus *cpu_bus, int max_cpus);
void release_aps_for_smm_relocation(int do_parallel_relocation);
+/* Determine if HyperThreading is disabled. The variable is not valid until
+ * setup_ap_init() has been called. */
+extern int ht_disabled;
#endif
/* This structure is saved along with the relocated ramstage program in SMM
diff --git a/src/cpu/intel/haswell/mp_init.c b/src/cpu/intel/haswell/mp_init.c
index 357fbb291d..1358418557 100644
--- a/src/cpu/intel/haswell/mp_init.c
+++ b/src/cpu/intel/haswell/mp_init.c
@@ -80,6 +80,8 @@ static atomic_t num_aps;
static atomic_t num_aps_relocated_smm;
/* Barrier to stop APs from performing SMM relcoation. */
static int smm_relocation_barrier_begin __attribute__ ((aligned (64)));
+/* Determine if hyperthreading is disabled. */
+int ht_disabled;
static inline void mfence(void)
{
@@ -197,6 +199,8 @@ static void asmlinkage ap_init(unsigned int cpu, void *microcode_ptr)
static void setup_default_sipi_vector_params(struct sipi_params *sp)
{
int i;
+ u8 apic_id;
+ u8 apic_id_inc;
sp->gdt = (u32)&gdt;
sp->gdtlimit = (u32)&gdt_end - (u32)&gdt - 1;
@@ -205,9 +209,15 @@ static void setup_default_sipi_vector_params(struct sipi_params *sp)
sp->stack_top = (u32)&_estack;
/* Adjust the stack top to take into account cpu_info. */
sp->stack_top -= sizeof(struct cpu_info);
- /* Default to linear APIC id space. */
- for (i = 0; i < CONFIG_MAX_CPUS; i++)
- sp->apic_to_cpu_num[i] = i;
+
+ /* Default to linear APIC id space if HT is enabled. If it is
+ * disabled the APIC ids increase by 2 as the odd numbered APIC
+ * ids are not present.*/
+ apic_id_inc = (ht_disabled) ? 2 : 1;
+ for (i = 0, apic_id = 0; i < CONFIG_MAX_CPUS; i++) {
+ sp->apic_to_cpu_num[i] = apic_id;
+ apic_id += apic_id_inc;
+ }
}
#define NUM_FIXED_MTRRS 11
@@ -374,6 +384,10 @@ static int allocate_cpu_devices(struct bus *cpu_bus, int *total_hw_threads)
max_cpus = CONFIG_MAX_CPUS;
}
+ /* Determine if hyperthreading is enabled. If not, the APIC id space
+ * is sparse with ids incrementing by 2 instead of 1. */
+ ht_disabled = num_threads == num_cores;
+
for (i = 1; i < max_cpus; i++) {
struct device_path cpu_path;
device_t new;
@@ -381,6 +395,8 @@ static int allocate_cpu_devices(struct bus *cpu_bus, int *total_hw_threads)
/* Build the cpu device path */
cpu_path.type = DEVICE_PATH_APIC;
cpu_path.apic.apic_id = info->cpu->path.apic.apic_id + i;
+ if (ht_disabled)
+ cpu_path.apic.apic_id = cpu_path.apic.apic_id * 2;
/* Allocate the new cpu device structure */
new = alloc_find_dev(cpu_bus, &cpu_path);
diff --git a/src/cpu/intel/haswell/smmrelocate.c b/src/cpu/intel/haswell/smmrelocate.c
index 6caeafa5e1..4fe6489be2 100644
--- a/src/cpu/intel/haswell/smmrelocate.c
+++ b/src/cpu/intel/haswell/smmrelocate.c
@@ -286,6 +286,22 @@ static void fill_in_relocation_params(device_t dev,
params->uncore_emrr_mask.hi = (1 << (39 - 32)) - 1;
}
+static void adjust_apic_id_map(struct smm_loader_params *smm_params)
+{
+ struct smm_runtime *runtime;
+ int i;
+
+ /* Adjust the APIC id map if HT is disabled. */
+ if (!ht_disabled)
+ return;
+
+ runtime = smm_params->runtime;
+
+ /* The APIC ids increment by 2 when HT is disabled. */
+ for (i = 0; i < CONFIG_MAX_CPUS; i++)
+ runtime->apic_id_to_cpu[i] = runtime->apic_id_to_cpu[i] * 2;
+}
+
static int install_relocation_handler(int num_cpus,
struct smm_relocation_params *relo_params)
{
@@ -305,7 +321,12 @@ static int install_relocation_handler(int num_cpus,
.handler_arg = (void *)relo_params,
};
- return smm_setup_relocation_handler(&smm_params);
+ if (smm_setup_relocation_handler(&smm_params))
+ return -1;
+
+ adjust_apic_id_map(&smm_params);
+
+ return 0;
}
static void setup_ied_area(struct smm_relocation_params *params)
@@ -347,8 +368,13 @@ static int install_permanent_handler(int num_cpus,
printk(BIOS_DEBUG, "Installing SMM handler to 0x%08x\n",
relo_params->smram_base);
- return smm_load_module((void *)relo_params->smram_base,
- relo_params->smram_size, &smm_params);
+ if (smm_load_module((void *)relo_params->smram_base,
+ relo_params->smram_size, &smm_params))
+ return -1;
+
+ adjust_apic_id_map(&smm_params);
+
+ return 0;
}
static int cpu_smm_setup(void)