1 files changed, 283 insertions, 56 deletions

diff --git a/arch/mips/kernel/smp-cps.c b/arch/mips/kernel/smp-cps.c
index 9cc087dd1c19..e85bd087467e 100644
--- a/arch/mips/kernel/smp-cps.c
+++ b/arch/mips/kernel/smp-cps.c
@@ -36,11 +36,55 @@ enum label_id {
 
 UASM_L_LA(_not_nmi)
 
-static DECLARE_BITMAP(core_power, NR_CPUS);
-static uint32_t core_entry_reg;
+static u64 core_entry_reg;
 static phys_addr_t cps_vec_pa;
 
-struct core_boot_config *mips_cps_core_bootcfg;
+struct cluster_boot_config *mips_cps_cluster_bootcfg;
+
+static void power_up_other_cluster(unsigned int cluster)
+{
+	u32 stat, seq_state;
+	unsigned int timeout;
+
+	mips_cm_lock_other(cluster, CM_GCR_Cx_OTHER_CORE_CM, 0,
+			   CM_GCR_Cx_OTHER_BLOCK_LOCAL);
+	stat = read_cpc_co_stat_conf();
+	mips_cm_unlock_other();
+
+	seq_state = stat & CPC_Cx_STAT_CONF_SEQSTATE;
+	seq_state >>= __ffs(CPC_Cx_STAT_CONF_SEQSTATE);
+	if (seq_state == CPC_Cx_STAT_CONF_SEQSTATE_U5)
+		return;
+
+	/* Set endianness & power up the CM */
+	mips_cm_lock_other(cluster, 0, 0, CM_GCR_Cx_OTHER_BLOCK_GLOBAL);
+	write_cpc_redir_sys_config(IS_ENABLED(CONFIG_CPU_BIG_ENDIAN));
+	write_cpc_redir_pwrup_ctl(1);
+	mips_cm_unlock_other();
+
+	/* Wait for the CM to start up */
+	timeout = 1000;
+	mips_cm_lock_other(cluster, CM_GCR_Cx_OTHER_CORE_CM, 0,
+			   CM_GCR_Cx_OTHER_BLOCK_LOCAL);
+	while (1) {
+		stat = read_cpc_co_stat_conf();
+		seq_state = stat & CPC_Cx_STAT_CONF_SEQSTATE;
+		seq_state >>= __ffs(CPC_Cx_STAT_CONF_SEQSTATE);
+		if (seq_state == CPC_Cx_STAT_CONF_SEQSTATE_U5)
+			break;
+
+		if (timeout) {
+			mdelay(1);
+			timeout--;
+		} else {
+			pr_warn("Waiting for cluster %u CM to power up... STAT_CONF=0x%x\n",
+				cluster, stat);
+			mdelay(1000);
+		}
+	}
+
+	mips_cm_unlock_other();
+}
 
 static unsigned __init core_vpe_count(unsigned int cluster, unsigned core)
 {
@@ -94,6 +138,20 @@ static void __init *mips_cps_build_core_entry(void *addr)
 	return p;
 }
 
+static bool __init check_64bit_reset(void)
+{
+	bool cx_64bit_reset = false;
+
+	mips_cm_lock_other(0, 0, 0, CM_GCR_Cx_OTHER_BLOCK_LOCAL);
+	write_gcr_co_reset64_base(CM_GCR_Cx_RESET64_BASE_BEVEXCBASE);
+	if ((read_gcr_co_reset64_base() & CM_GCR_Cx_RESET64_BASE_BEVEXCBASE) ==
+	    CM_GCR_Cx_RESET64_BASE_BEVEXCBASE)
+		cx_64bit_reset = true;
+	mips_cm_unlock_other();
+
+	return cx_64bit_reset;
+}
+
 static int __init allocate_cps_vecs(void)
 {
 	/* Try to allocate in KSEG1 first */
@@ -105,11 +163,23 @@ static int __init allocate_cps_vecs(void)
 					CM_GCR_Cx_RESET_BASE_BEVEXCBASE;
 
 	if (!cps_vec_pa && mips_cm_is64) {
-		cps_vec_pa = memblock_phys_alloc_range(BEV_VEC_SIZE, BEV_VEC_ALIGN,
-							0x0, SZ_4G - 1);
-		if (cps_vec_pa)
-			core_entry_reg = (cps_vec_pa & CM_GCR_Cx_RESET_BASE_BEVEXCBASE) |
+		phys_addr_t end;
+
+		if (check_64bit_reset()) {
+			pr_info("VP Local Reset Exception Base support 47 bits address\n");
+			end = MEMBLOCK_ALLOC_ANYWHERE;
+		} else {
+			end = SZ_4G - 1;
+		}
+		cps_vec_pa = memblock_phys_alloc_range(BEV_VEC_SIZE, BEV_VEC_ALIGN, 0, end);
+		if (cps_vec_pa) {
+			if (check_64bit_reset())
+				core_entry_reg = (cps_vec_pa & CM_GCR_Cx_RESET64_BASE_BEVEXCBASE) |
+					CM_GCR_Cx_RESET_BASE_MODE;
+			else
+				core_entry_reg = (cps_vec_pa & CM_GCR_Cx_RESET_BASE_BEVEXCBASE) |
 					CM_GCR_Cx_RESET_BASE_MODE;
+		}
 	}
 
 	if (!cps_vec_pa)
@@ -152,6 +222,9 @@ static void __init cps_smp_setup(void)
 			pr_cont(",");
 		pr_cont("{");
 
+		if (mips_cm_revision() >= CM_REV_CM3_5)
+			power_up_other_cluster(cl);
+
 		ncores = mips_cps_numcores(cl);
 		for (c = 0; c < ncores; c++) {
 			core_vpes = core_vpe_count(cl, c);
@@ -179,8 +252,8 @@ static void __init cps_smp_setup(void)
 
 	/* Indicate present CPUs (CPU being synonymous with VPE) */
 	for (v = 0; v < min_t(unsigned, nvpes, NR_CPUS); v++) {
-		set_cpu_possible(v, cpu_cluster(&cpu_data[v]) == 0);
-		set_cpu_present(v, cpu_cluster(&cpu_data[v]) == 0);
+		set_cpu_possible(v, true);
+		set_cpu_present(v, true);
 		__cpu_number_map[v] = v;
 		__cpu_logical_map[v] = v;
 	}
@@ -188,9 +261,6 @@ static void __init cps_smp_setup(void)
 	/* Set a coherent default CCA (CWB) */
 	change_c0_config(CONF_CM_CMASK, 0x5);
 
-	/* Core 0 is powered up (we're running on it) */
-	bitmap_set(core_power, 0, 1);
-
 	/* Initialise core 0 */
 	mips_cps_core_init();
 
@@ -212,8 +282,10 @@ static void __init cps_smp_setup(void)
 
 static void __init cps_prepare_cpus(unsigned int max_cpus)
 {
-	unsigned ncores, core_vpes, c, cca;
+	unsigned int nclusters, ncores, core_vpes, c, cl, cca;
 	bool cca_unsuitable, cores_limited;
+	struct cluster_boot_config *cluster_bootcfg;
+	struct core_boot_config *core_bootcfg;
 
 	mips_mt_set_cpuoptions();
 
@@ -255,40 +327,62 @@ static void __init cps_prepare_cpus(unsigned int max_cpus)
 
 	setup_cps_vecs();
 
-	/* Allocate core boot configuration structs */
-	ncores = mips_cps_numcores(0);
-	mips_cps_core_bootcfg = kcalloc(ncores, sizeof(*mips_cps_core_bootcfg),
+	/* Allocate cluster boot configuration structs */
+	nclusters = mips_cps_numclusters();
+	mips_cps_cluster_bootcfg = kcalloc(nclusters,
+					   sizeof(*mips_cps_cluster_bootcfg),
+					   GFP_KERNEL);
+
+	if (nclusters > 1)
+		mips_cm_update_property();
+
+	for (cl = 0; cl < nclusters; cl++) {
+		/* Allocate core boot configuration structs */
+		ncores = mips_cps_numcores(cl);
+		core_bootcfg = kcalloc(ncores, sizeof(*core_bootcfg),
 					GFP_KERNEL);
-	if (!mips_cps_core_bootcfg) {
-		pr_err("Failed to allocate boot config for %u cores\n", ncores);
-		goto err_out;
-	}
+		if (!core_bootcfg)
+			goto err_out;
+		mips_cps_cluster_bootcfg[cl].core_config = core_bootcfg;
 
-	/* Allocate VPE boot configuration structs */
-	for (c = 0; c < ncores; c++) {
-		core_vpes = core_vpe_count(0, c);
-		mips_cps_core_bootcfg[c].vpe_config = kcalloc(core_vpes,
-				sizeof(*mips_cps_core_bootcfg[c].vpe_config),
+		mips_cps_cluster_bootcfg[cl].core_power =
+			kcalloc(BITS_TO_LONGS(ncores), sizeof(unsigned long),
 				GFP_KERNEL);
-		if (!mips_cps_core_bootcfg[c].vpe_config) {
-			pr_err("Failed to allocate %u VPE boot configs\n",
-			       core_vpes);
-			goto err_out;
+
+		/* Allocate VPE boot configuration structs */
+		for (c = 0; c < ncores; c++) {
+			core_vpes = core_vpe_count(cl, c);
+			core_bootcfg[c].vpe_config = kcalloc(core_vpes,
+					sizeof(*core_bootcfg[c].vpe_config),
+					GFP_KERNEL);
+			if (!core_bootcfg[c].vpe_config)
+				goto err_out;
 		}
 	}
 
-	/* Mark this CPU as booted */
-	atomic_set(&mips_cps_core_bootcfg[cpu_core(&current_cpu_data)].vpe_mask,
-		   1 << cpu_vpe_id(&current_cpu_data));
+	/* Mark this CPU as powered up & booted */
+	cl = cpu_cluster(&current_cpu_data);
+	c = cpu_core(&current_cpu_data);
+	cluster_bootcfg = &mips_cps_cluster_bootcfg[cl];
+	core_bootcfg = &cluster_bootcfg->core_config[c];
+	bitmap_set(cluster_bootcfg->core_power, cpu_core(&current_cpu_data), 1);
+	atomic_set(&core_bootcfg->vpe_mask, 1 << cpu_vpe_id(&current_cpu_data));
 
 	return;
 err_out:
 	/* Clean up allocations */
-	if (mips_cps_core_bootcfg) {
-		for (c = 0; c < ncores; c++)
-			kfree(mips_cps_core_bootcfg[c].vpe_config);
-		kfree(mips_cps_core_bootcfg);
-		mips_cps_core_bootcfg = NULL;
+	if (mips_cps_cluster_bootcfg) {
+		for (cl = 0; cl < nclusters; cl++) {
+			cluster_bootcfg = &mips_cps_cluster_bootcfg[cl];
+			ncores = mips_cps_numcores(cl);
+			for (c = 0; c < ncores; c++) {
+				core_bootcfg = &cluster_bootcfg->core_config[c];
+				kfree(core_bootcfg->vpe_config);
+			}
+			kfree(mips_cps_cluster_bootcfg[c].core_config);
+		}
+		kfree(mips_cps_cluster_bootcfg);
+		mips_cps_cluster_bootcfg = NULL;
 	}
 
 	/* Effectively disable SMP by declaring CPUs not present */
@@ -299,16 +393,124 @@ err_out:
 	}
 }
 
-static void boot_core(unsigned int core, unsigned int vpe_id)
+static void init_cluster_l2(void)
 {
-	u32 stat, seq_state;
-	unsigned timeout;
+	u32 l2_cfg, l2sm_cop, result;
+
+	while (!mips_cm_is_l2_hci_broken) {
+		l2_cfg = read_gcr_redir_l2_ram_config();
+
+		/* If HCI is not supported, use the state machine below */
+		if (!(l2_cfg & CM_GCR_L2_RAM_CONFIG_PRESENT))
+			break;
+		if (!(l2_cfg & CM_GCR_L2_RAM_CONFIG_HCI_SUPPORTED))
+			break;
+
+		/* If the HCI_DONE bit is set, we're finished */
+		if (l2_cfg & CM_GCR_L2_RAM_CONFIG_HCI_DONE)
+			return;
+	}
+
+	l2sm_cop = read_gcr_redir_l2sm_cop();
+	if (WARN(!(l2sm_cop & CM_GCR_L2SM_COP_PRESENT),
+		 "L2 init not supported on this system yet"))
+		return;
+
+	/* Clear L2 tag registers */
+	write_gcr_redir_l2_tag_state(0);
+	write_gcr_redir_l2_ecc(0);
+
+	/* Ensure the L2 tag writes complete before the state machine starts */
+	mb();
+
+	/* Wait for the L2 state machine to be idle */
+	do {
+		l2sm_cop = read_gcr_redir_l2sm_cop();
+	} while (l2sm_cop & CM_GCR_L2SM_COP_RUNNING);
+
+	/* Start a store tag operation */
+	l2sm_cop = CM_GCR_L2SM_COP_TYPE_IDX_STORETAG;
+	l2sm_cop <<= __ffs(CM_GCR_L2SM_COP_TYPE);
+	l2sm_cop |= CM_GCR_L2SM_COP_CMD_START;
+	write_gcr_redir_l2sm_cop(l2sm_cop);
+
+	/* Ensure the state machine starts before we poll for completion */
+	mb();
+
+	/* Wait for the operation to be complete */
+	do {
+		l2sm_cop = read_gcr_redir_l2sm_cop();
+		result = l2sm_cop & CM_GCR_L2SM_COP_RESULT;
+		result >>= __ffs(CM_GCR_L2SM_COP_RESULT);
+	} while (!result);
+
+	WARN(result != CM_GCR_L2SM_COP_RESULT_DONE_OK,
+	     "L2 state machine failed cache init with error %u\n", result);
+}
+
+static void boot_core(unsigned int cluster, unsigned int core,
+		      unsigned int vpe_id)
+{
+	struct cluster_boot_config *cluster_cfg;
+	u32 access, stat, seq_state;
+	unsigned int timeout, ncores;
+
+	cluster_cfg = &mips_cps_cluster_bootcfg[cluster];
+	ncores = mips_cps_numcores(cluster);
+
+	if ((cluster != cpu_cluster(&current_cpu_data)) &&
+	    bitmap_empty(cluster_cfg->core_power, ncores)) {
+		power_up_other_cluster(cluster);
+
+		mips_cm_lock_other(cluster, core, 0,
+				   CM_GCR_Cx_OTHER_BLOCK_GLOBAL);
+
+		/* Ensure cluster GCRs are where we expect */
+		write_gcr_redir_base(read_gcr_base());
+		write_gcr_redir_cpc_base(read_gcr_cpc_base());
+		write_gcr_redir_gic_base(read_gcr_gic_base());
+
+		init_cluster_l2();
+
+		/* Mirror L2 configuration */
+		write_gcr_redir_l2_only_sync_base(read_gcr_l2_only_sync_base());
+		write_gcr_redir_l2_pft_control(read_gcr_l2_pft_control());
+		write_gcr_redir_l2_pft_control_b(read_gcr_l2_pft_control_b());
+
+		/* Mirror ECC/parity setup */
+		write_gcr_redir_err_control(read_gcr_err_control());
+
+		/* Set BEV base */
+		write_gcr_redir_bev_base(core_entry_reg);
+
+		mips_cm_unlock_other();
+	}
+
+	if (cluster != cpu_cluster(&current_cpu_data)) {
+		mips_cm_lock_other(cluster, core, 0,
+				   CM_GCR_Cx_OTHER_BLOCK_GLOBAL);
+
+		/* Ensure the core can access the GCRs */
+		access = read_gcr_redir_access();
+		access |= BIT(core);
+		write_gcr_redir_access(access);
+
+		mips_cm_unlock_other();
+	} else {
+		/* Ensure the core can access the GCRs */
+		access = read_gcr_access();
+		access |= BIT(core);
+		write_gcr_access(access);
+	}
 
 	/* Select the appropriate core */
-	mips_cm_lock_other(0, core, 0, CM_GCR_Cx_OTHER_BLOCK_LOCAL);
+	mips_cm_lock_other(cluster, core, 0, CM_GCR_Cx_OTHER_BLOCK_LOCAL);
 
 	/* Set its reset vector */
-	write_gcr_co_reset_base(core_entry_reg);
+	if (mips_cm_is64)
+		write_gcr_co_reset64_base(core_entry_reg);
+	else
+		write_gcr_co_reset_base(core_entry_reg);
 
 	/* Ensure its coherency is disabled */
 	write_gcr_co_coherence(0);
@@ -317,7 +519,10 @@ static void boot_core(unsigned int core, unsigned int vpe_id)
 	write_gcr_co_reset_ext_base(CM_GCR_Cx_RESET_EXT_BASE_UEB);
 
 	/* Ensure the core can access the GCRs */
-	set_gcr_access(1 << core);
+	if (mips_cm_revision() < CM_REV_CM3)
+		set_gcr_access(1 << core);
+	else
+		set_gcr_access_cm3(1 << core);
 
 	if (mips_cpc_present()) {
 		/* Reset the core */
@@ -368,30 +573,42 @@ static void boot_core(unsigned int core, unsigned int vpe_id)
 	mips_cm_unlock_other();
 
 	/* The core is now powered up */
-	bitmap_set(core_power, core, 1);
+	bitmap_set(cluster_cfg->core_power, core, 1);
+
+	/*
+	 * Restore CM_PWRUP=0 so that the CM can power down if all the cores in
+	 * the cluster do (eg. if they're all removed via hotplug.
+	 */
+	if (mips_cm_revision() >= CM_REV_CM3_5) {
+		mips_cm_lock_other(cluster, 0, 0, CM_GCR_Cx_OTHER_BLOCK_GLOBAL);
+		write_cpc_redir_pwrup_ctl(0);
+		mips_cm_unlock_other();
+	}
 }
 
 static void remote_vpe_boot(void *dummy)
 {
+	unsigned int cluster = cpu_cluster(&current_cpu_data);
 	unsigned core = cpu_core(&current_cpu_data);
-	struct core_boot_config *core_cfg = &mips_cps_core_bootcfg[core];
+	struct cluster_boot_config *cluster_cfg =
+		&mips_cps_cluster_bootcfg[cluster];
+	struct core_boot_config *core_cfg = &cluster_cfg->core_config[core];
 
 	mips_cps_boot_vpes(core_cfg, cpu_vpe_id(&current_cpu_data));
 }
 
 static int cps_boot_secondary(int cpu, struct task_struct *idle)
 {
+	unsigned int cluster = cpu_cluster(&cpu_data[cpu]);
 	unsigned core = cpu_core(&cpu_data[cpu]);
 	unsigned vpe_id = cpu_vpe_id(&cpu_data[cpu]);
-	struct core_boot_config *core_cfg = &mips_cps_core_bootcfg[core];
+	struct cluster_boot_config *cluster_cfg =
+		&mips_cps_cluster_bootcfg[cluster];
+	struct core_boot_config *core_cfg = &cluster_cfg->core_config[core];
 	struct vpe_boot_config *vpe_cfg = &core_cfg->vpe_config[vpe_id];
 	unsigned int remote;
 	int err;
 
-	/* We don't yet support booting CPUs in other clusters */
-	if (cpu_cluster(&cpu_data[cpu]) != cpu_cluster(&raw_current_cpu_data))
-		return -ENOSYS;
-
 	vpe_cfg->pc = (unsigned long)&smp_bootstrap;
 	vpe_cfg->sp = __KSTK_TOS(idle);
 	vpe_cfg->gp = (unsigned long)task_thread_info(idle);
@@ -400,15 +617,19 @@ static int cps_boot_secondary(int cpu, struct task_struct *idle)
 
 	preempt_disable();
 
-	if (!test_bit(core, core_power)) {
+	if (!test_bit(core, cluster_cfg->core_power)) {
 		/* Boot a VPE on a powered down core */
-		boot_core(core, vpe_id);
+		boot_core(cluster, core, vpe_id);
 		goto out;
 	}
 
 	if (cpu_has_vp) {
-		mips_cm_lock_other(0, core, vpe_id, CM_GCR_Cx_OTHER_BLOCK_LOCAL);
-		write_gcr_co_reset_base(core_entry_reg);
+		mips_cm_lock_other(cluster, core, vpe_id,
+				   CM_GCR_Cx_OTHER_BLOCK_LOCAL);
+		if (mips_cm_is64)
+			write_gcr_co_reset64_base(core_entry_reg);
+		else
+			write_gcr_co_reset_base(core_entry_reg);
 		mips_cm_unlock_other();
 	}
 
@@ -541,12 +762,14 @@ static void cps_kexec_nonboot_cpu(void)
 static int cps_cpu_disable(void)
 {
 	unsigned cpu = smp_processor_id();
+	struct cluster_boot_config *cluster_cfg;
 	struct core_boot_config *core_cfg;
 
 	if (!cps_pm_support_state(CPS_PM_POWER_GATED))
 		return -EINVAL;
 
-	core_cfg = &mips_cps_core_bootcfg[cpu_core(&current_cpu_data)];
+	cluster_cfg = &mips_cps_cluster_bootcfg[cpu_cluster(&current_cpu_data)];
+	core_cfg = &cluster_cfg->core_config[cpu_core(&current_cpu_data)];
 	atomic_sub(1 << cpu_vpe_id(&current_cpu_data), &core_cfg->vpe_mask);
 	smp_mb__after_atomic();
 	set_cpu_online(cpu, false);
@@ -612,11 +835,15 @@ static void cps_cpu_die(unsigned int cpu) { }
 
 static void cps_cleanup_dead_cpu(unsigned cpu)
 {
+	unsigned int cluster = cpu_cluster(&cpu_data[cpu]);
 	unsigned core = cpu_core(&cpu_data[cpu]);
 	unsigned int vpe_id = cpu_vpe_id(&cpu_data[cpu]);
 	ktime_t fail_time;
 	unsigned stat;
 	int err;
+	struct cluster_boot_config *cluster_cfg;
+
+	cluster_cfg = &mips_cps_cluster_bootcfg[cluster];
 
 	/*
 	 * Now wait for the CPU to actually offline. Without doing this that
@@ -668,7 +895,7 @@ static void cps_cleanup_dead_cpu(unsigned cpu)
 		} while (1);
 
 		/* Indicate the core is powered off */
-		bitmap_clear(core_power, core, 1);
+		bitmap_clear(cluster_cfg->core_power, core, 1);
 	} else if (cpu_has_mipsmt) {
 		/*
 		 * Have a CPU with access to the offlined CPUs registers wait