MIPS: CPS: Introduce struct cluster_boot_config

In preparation for supporting multi-cluster systems, introduce a struct
cluster_boot_config as an extra layer in the boot configuration
maintained by the MIPS Coherent Processing System (CPS) SMP
implementation. For now only one struct cluster_boot_config will be
allocated & we'll simply defererence its core_config field to find the
struct core_boot_config array which can be used to boot as usual.

Signed-off-by: Paul Burton <paulburton@kernel.org>
Signed-off-by: Dragan Mladjenovic <dragan.mladjenovic@syrmia.com>
Signed-off-by: Aleksandar Rikalo <arikalo@gmail.com>
Tested-by: Serge Semin <fancer.lancer@gmail.com>
Tested-by: Gregory CLEMENT <gregory.clement@bootlin.com>
Signed-off-by: Thomas Bogendoerfer <tsbogend@alpha.franken.de>

arch/mips/include/asm/smp-cps.h

@@ -22,7 +22,11 @@ struct core_boot_config {
 	struct vpe_boot_config *vpe_config;
 };
 
-extern struct core_boot_config *mips_cps_core_bootcfg;
+struct cluster_boot_config {
+	struct core_boot_config *core_config;
+};
+
+extern struct cluster_boot_config *mips_cps_cluster_bootcfg;
 
 extern void mips_cps_core_boot(int cca, void __iomem *gcr_base);
 extern void mips_cps_core_init(void);

arch/mips/kernel/asm-offsets.c

@@ -410,6 +410,9 @@ void output_cps_defines(void)
 {
 	COMMENT(" MIPS CPS offsets. ");
 
+	OFFSET(CLUSTERBOOTCFG_CORECONFIG, cluster_boot_config, core_config);
+	DEFINE(CLUSTERBOOTCFG_SIZE, sizeof(struct cluster_boot_config));
+
 	OFFSET(COREBOOTCFG_VPEMASK, core_boot_config, vpe_mask);
 	OFFSET(COREBOOTCFG_VPECONFIG, core_boot_config, vpe_config);
 	DEFINE(COREBOOTCFG_SIZE, sizeof(struct core_boot_config));

arch/mips/kernel/cps-vec.S

@@ -19,6 +19,10 @@
 #define GCR_CPC_BASE_OFS	0x0088
 #define GCR_CL_COHERENCE_OFS	0x2008
 #define GCR_CL_ID_OFS		0x2028
+#define  CM3_GCR_Cx_ID_CLUSTER_SHF	8
+#define  CM3_GCR_Cx_ID_CLUSTER_MSK	(0xff << 8)
+#define  CM3_GCR_Cx_ID_CORENUM_SHF	0
+#define  CM3_GCR_Cx_ID_CORENUM_MSK	(0xff << 0)
 
 #define CPC_CL_VC_STOP_OFS	0x2020
 #define CPC_CL_VC_RUN_OFS	0x2028
@@ -271,12 +275,21 @@ LEAF(mips_cps_core_init)
  */
 LEAF(mips_cps_get_bootcfg)
 	/* Calculate a pointer to this cores struct core_boot_config */
+	PTR_LA	v0, mips_cps_cluster_bootcfg
+	PTR_L	v0, 0(v0)
 	lw	t0, GCR_CL_ID_OFS(s1)
+#ifdef CONFIG_CPU_MIPSR6
+	ext	t1, t0, CM3_GCR_Cx_ID_CLUSTER_SHF, 8
+	li	t2, CLUSTERBOOTCFG_SIZE
+	mul	t1, t1, t2
+	PTR_ADDU \
+		v0, v0, t1
+#endif
+	PTR_L	v0, CLUSTERBOOTCFG_CORECONFIG(v0)
+	andi	t0, t0, CM3_GCR_Cx_ID_CORENUM_MSK
 	li	t1, COREBOOTCFG_SIZE
 	mul	t0, t0, t1
-	PTR_LA	t1, mips_cps_core_bootcfg
-	PTR_L	t1, 0(t1)
-	PTR_ADDU v0, t0, t1
+	PTR_ADDU v0, v0, t0
 
 	/* Calculate this VPEs ID. If the core doesn't support MT use 0 */
 	li	t9, 0

arch/mips/kernel/pm-cps.c

@@ -101,12 +101,14 @@ static void coupled_barrier(atomic_t *a, unsigned online)
 int cps_pm_enter_state(enum cps_pm_state state)
 {
 	unsigned cpu = smp_processor_id();
+	unsigned int cluster = cpu_cluster(&current_cpu_data);
 	unsigned core = cpu_core(&current_cpu_data);
 	unsigned online, left;
 	cpumask_t *coupled_mask = this_cpu_ptr(&online_coupled);
 	u32 *core_ready_count, *nc_core_ready_count;
 	void *nc_addr;
 	cps_nc_entry_fn entry;
+	struct cluster_boot_config *cluster_cfg;
 	struct core_boot_config *core_cfg;
 	struct vpe_boot_config *vpe_cfg;
 	atomic_t *barrier;
@@ -136,7 +138,8 @@ int cps_pm_enter_state(enum cps_pm_state state)
 		if (!mips_cps_smp_in_use())
 			return -EINVAL;
 
-		core_cfg = &mips_cps_core_bootcfg[core];
+		cluster_cfg = &mips_cps_cluster_bootcfg[cluster];
+		core_cfg = &cluster_cfg->core_config[core];
 		vpe_cfg = &core_cfg->vpe_config[cpu_vpe_id(&current_cpu_data)];
 		vpe_cfg->pc = (unsigned long)mips_cps_pm_restore;
 		vpe_cfg->gp = (unsigned long)current_thread_info();

arch/mips/kernel/smp-cps.c

@@ -40,7 +40,7 @@ static DECLARE_BITMAP(core_power, NR_CPUS);
 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 unsigned __init core_vpe_count(unsigned int cluster, unsigned core)
 {
@@ -238,8 +238,10 @@ 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();
 
@@ -281,40 +283,54 @@ 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),
-					GFP_KERNEL);
-	if (!mips_cps_core_bootcfg) {
-		pr_err("Failed to allocate boot config for %u cores\n", ncores);
-		goto err_out;
-	}
+	/* Allocate cluster boot configuration structs */
+	nclusters = mips_cps_numclusters();
+	mips_cps_cluster_bootcfg = kcalloc(nclusters,
+					   sizeof(*mips_cps_cluster_bootcfg),
+					   GFP_KERNEL);
 
-	/* 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),
-				GFP_KERNEL);
-		if (!mips_cps_core_bootcfg[c].vpe_config) {
-			pr_err("Failed to allocate %u VPE boot configs\n",
-			       core_vpes);
+	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 (!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(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));
+	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];
+	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 */
@@ -405,17 +421,23 @@ static void boot_core(unsigned int core, unsigned int vpe_id)
 
 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;
@@ -576,12 +598,14 @@ 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);