Revert "Use broadcast SIPI to startup siblings"

This reverts commit 042c1461fb777e583e5de48edf9326e47ee5595f.

It turned out that sending IPIs via broadcast doesn't work on
Sandybridge. We tried to come up with a solution, but didn't
found any so far. So revert the code for now until we have
a working solution.

Change-Id: I7dd1cba5a4c1e4b0af366b20e8263b1f6f4b9714
Signed-off-by: Sven Schnelle <svens@stackframe.org>
Reviewed-on: http://review.coreboot.org/1381
Tested-by: build bot (Jenkins)
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>

2 files changed, 302 insertions, 84 deletions

diff --git a/src/cpu/x86/lapic/lapic_cpu_init.c b/src/cpu/x86/lapic/lapic_cpu_init.c
index b6dc560308..d61547dad0 100644
--- a/src/cpu/x86/lapic/lapic_cpu_init.c
+++ b/src/cpu/x86/lapic/lapic_cpu_init.c
@@ -60,28 +60,31 @@ static void copy_secondary_start_to_1m_below(void)
 	printk(BIOS_DEBUG, "start_eip=0x%08lx, code_size=0x%08lx\n", (long unsigned int)AP_SIPI_VECTOR, code_size);
 }
 
-static struct bus *current_cpu_bus;
-
-static int lapic_start_cpus(struct bus *cpu_bus)
+static int lapic_start_cpu(unsigned long apicid)
 {
 	int timeout;
 	unsigned long send_status, accept_status;
-	int maxlvt;
+	int j, num_starts, maxlvt;
 
 	/*
 	 * Starting actual IPI sequence...
 	 */
 
-	current_cpu_bus = cpu_bus;
-
 	printk(BIOS_SPEW, "Asserting INIT.\n");
 
-	/* Send INIT SIPI to target chip */
-	lapic_write_around(LAPIC_ICR2, 0);
-	lapic_write_around(LAPIC_ICR, LAPIC_INT_ASSERT
-				| LAPIC_DM_INIT | LAPIC_DEST_ALLBUT);
+	/*
+	 * Turn INIT on target chip
+	 */
+	lapic_write_around(LAPIC_ICR2, SET_LAPIC_DEST_FIELD(apicid));
+
+	/*
+	 * Send IPI
+	 */
+
+	lapic_write_around(LAPIC_ICR, LAPIC_INT_LEVELTRIG | LAPIC_INT_ASSERT
+				| LAPIC_DM_INIT);
 
-	printk(BIOS_DEBUG, "Waiting for send to finish...\n");
+	printk(BIOS_SPEW, "Waiting for send to finish...\n");
 	timeout = 0;
 	do {
 		printk(BIOS_SPEW, "+");
@@ -89,66 +92,106 @@ static int lapic_start_cpus(struct bus *cpu_bus)
 		send_status = lapic_read(LAPIC_ICR) & LAPIC_ICR_BUSY;
 	} while (send_status && (timeout++ < 1000));
 	if (timeout >= 1000) {
-		printk(BIOS_DEBUG, "First apic write timed out. Disabling\n");
+		printk(BIOS_ERR, "CPU %ld: First apic write timed out. Disabling\n",
+			 apicid);
 		// too bad.
-		printk(BIOS_DEBUG, "ESR is 0x%lx\n", lapic_read(LAPIC_ESR));
+		printk(BIOS_ERR, "ESR is 0x%lx\n", lapic_read(LAPIC_ESR));
 		if (lapic_read(LAPIC_ESR)) {
-			printk(BIOS_DEBUG, "Try to reset ESR\n");
+			printk(BIOS_ERR, "Try to reset ESR\n");
 			lapic_write_around(LAPIC_ESR, 0);
-			printk(BIOS_DEBUG, "ESR is 0x%lx\n", lapic_read(LAPIC_ESR));
+			printk(BIOS_ERR, "ESR is 0x%lx\n", lapic_read(LAPIC_ESR));
 		}
 		return 0;
 	}
+#if !CONFIG_CPU_AMD_MODEL_10XXX && !CONFIG_CPU_INTEL_MODEL_206AX
+	mdelay(10);
+#endif
 
-	maxlvt = 4;
-
-	printk(BIOS_SPEW, "Sending STARTUP.\n");
-	lapic_read_around(LAPIC_SPIV);
-	lapic_write(LAPIC_ESR, 0);
-	lapic_read(LAPIC_ESR);
-	printk(BIOS_SPEW, "After apic_write.\n");
-
-	/*
-	 * STARTUP IPI
-	 */
+	printk(BIOS_SPEW, "Deasserting INIT.\n");
 
 	/* Target chip */
-	lapic_write_around(LAPIC_ICR2, 0);
-
-	/* Boot on the stack */
-	/* Kick the second */
-	lapic_write_around(LAPIC_ICR, LAPIC_INT_ASSERT | LAPIC_DM_STARTUP | LAPIC_DEST_ALLBUT
-			   | ((AP_SIPI_VECTOR >> 12) & 0xff));
+	lapic_write_around(LAPIC_ICR2, SET_LAPIC_DEST_FIELD(apicid));
 
-	/*
-	 * Give the other CPU some time to accept the IPI.
-	 */
-	udelay(300);
+	/* Send IPI */
+	lapic_write_around(LAPIC_ICR, LAPIC_INT_LEVELTRIG | LAPIC_DM_INIT);
 
-	printk(BIOS_DEBUG, "Startup point 1.\n");
-
-	printk(BIOS_DEBUG, "Waiting for send to finish...\n");
+	printk(BIOS_SPEW, "Waiting for send to finish...\n");
 	timeout = 0;
 	do {
-		printk(BIOS_DEBUG, "+");
+		printk(BIOS_SPEW, "+");
 		udelay(100);
 		send_status = lapic_read(LAPIC_ICR) & LAPIC_ICR_BUSY;
 	} while (send_status && (timeout++ < 1000));
+	if (timeout >= 1000) {
+		printk(BIOS_ERR, "CPU %ld: Second apic write timed out. Disabling\n",
+			 apicid);
+		// too bad.
+		return 0;
+	}
+
+#if !CONFIG_CPU_AMD_MODEL_10XXX
+	num_starts = 2;
+#else
+	num_starts = 1;
+#endif
 
 	/*
-	 * Give the other CPU some time to accept the IPI.
-	 */
-	udelay(200);
-	/*
-	 * Due to the Pentium erratum 3AP.
+	 * Run STARTUP IPI loop.
 	 */
-	if (maxlvt > 3) {
+	printk(BIOS_SPEW, "#startup loops: %d.\n", num_starts);
+
+	maxlvt = 4;
+
+	for (j = 1; j <= num_starts; j++) {
+		printk(BIOS_SPEW, "Sending STARTUP #%d to %lu.\n", j, apicid);
 		lapic_read_around(LAPIC_SPIV);
 		lapic_write(LAPIC_ESR, 0);
+		lapic_read(LAPIC_ESR);
+		printk(BIOS_SPEW, "After apic_write.\n");
+
+		/*
+		 * STARTUP IPI
+		 */
+
+		/* Target chip */
+		lapic_write_around(LAPIC_ICR2, SET_LAPIC_DEST_FIELD(apicid));
+
+		/* Boot on the stack */
+		/* Kick the second */
+		lapic_write_around(LAPIC_ICR, LAPIC_DM_STARTUP
+					| (AP_SIPI_VECTOR >> 12));
+
+		/*
+		 * Give the other CPU some time to accept the IPI.
+		 */
+		udelay(300);
+
+		printk(BIOS_SPEW, "Startup point 1.\n");
+
+		printk(BIOS_SPEW, "Waiting for send to finish...\n");
+		timeout = 0;
+		do {
+			printk(BIOS_SPEW, "+");
+			udelay(100);
+			send_status = lapic_read(LAPIC_ICR) & LAPIC_ICR_BUSY;
+		} while (send_status && (timeout++ < 1000));
+
+		/*
+		 * Give the other CPU some time to accept the IPI.
+		 */
+		udelay(200);
+		/*
+		 * Due to the Pentium erratum 3AP.
+		 */
+		if (maxlvt > 3) {
+			lapic_read_around(LAPIC_SPIV);
+			lapic_write(LAPIC_ESR, 0);
+		}
+		accept_status = (lapic_read(LAPIC_ESR) & 0xEF);
+		if (send_status || accept_status)
+			break;
 	}
-	accept_status = (lapic_read(LAPIC_ESR) & 0xEF);
-
-	printk(BIOS_DEBUG, "After Startup.\n");
+	printk(BIOS_SPEW, "After Startup.\n");
 	if (send_status)
 		printk(BIOS_WARNING, "APIC never delivered???\n");
 	if (accept_status)
@@ -158,34 +201,156 @@ static int lapic_start_cpus(struct bus *cpu_bus)
 	return 1;
 }
 
-
 /* Number of cpus that are currently running in coreboot */
 static atomic_t active_cpus = ATOMIC_INIT(1);
 
+/* start_cpu_lock covers last_cpu_index and secondary_stack.
+ * Only starting one cpu at a time let's me remove the logic
+ * for select the stack from assembly language.
+ *
+ * In addition communicating by variables to the cpu I
+ * am starting allows me to veryify it has started before
+ * start_cpu returns.
+ */
+
+static spinlock_t start_cpu_lock = SPIN_LOCK_UNLOCKED;
+static unsigned last_cpu_index = 0;
 volatile unsigned long secondary_stack;
-extern unsigned char _estack[];
 
-static void stop_all_ap_cpus(void)
+int start_cpu(device_t cpu)
+{
+	extern unsigned char _estack[];
+	struct cpu_info *info;
+	unsigned long stack_end;
+	unsigned long apicid;
+	unsigned long index;
+	unsigned long count;
+	int result;
+
+	spin_lock(&start_cpu_lock);
+
+	/* Get the cpu's apicid */
+	apicid = cpu->path.apic.apic_id;
+
+	/* Get an index for the new processor */
+	index = ++last_cpu_index;
+
+	/* Find end of the new processors stack */
+	stack_end = ((unsigned long)_estack) - (CONFIG_STACK_SIZE*index) - sizeof(struct cpu_info);
+
+	/* Record the index and which cpu structure we are using */
+	info = (struct cpu_info *)stack_end;
+	info->index = index;
+	info->cpu   = cpu;
+
+	/* Advertise the new stack to start_cpu */
+	secondary_stack = stack_end;
+
+	/* Until the cpu starts up report the cpu is not enabled */
+	cpu->enabled = 0;
+	cpu->initialized = 0;
+
+	/* Start the cpu */
+	result = lapic_start_cpu(apicid);
+
+	if (result) {
+		result = 0;
+		/* Wait 1s or until the new cpu calls in */
+		for(count = 0; count < 100000 ; count++) {
+			if (secondary_stack == 0) {
+				result = 1;
+				break;
+			}
+			udelay(10);
+	}
+	}
+	secondary_stack = 0;
+	spin_unlock(&start_cpu_lock);
+	return result;
+}
+
+#if CONFIG_AP_IN_SIPI_WAIT
+
+/**
+ * Sending INIT IPI to self is equivalent of asserting #INIT with a bit of delay.
+ * An undefined number of instruction cycles will complete. All global locks
+ * must be released before INIT IPI and no printk is allowed after this.
+ * De-asserting INIT IPI is a no-op on later Intel CPUs.
+ *
+ * If you set DEBUG_HALT_SELF to 1, printk's after INIT IPI are enabled
+ * but running thread may halt without releasing the lock and effectively
+ * deadlock other CPUs.
+ */
+#define DEBUG_HALT_SELF 0
+
+/**
+ * Normally this function is defined in lapic.h as an always inline function
+ * that just keeps the CPU in a hlt() loop. This does not work on all CPUs.
+ * I think all hyperthreading CPUs might need this version, but I could only
+ * verify this on the Intel Core Duo
+ */
+void stop_this_cpu(void)
 {
-	unsigned long send_status;
 	int timeout;
-	/* send an LAPIC INIT to all but myself */
-	lapic_write_around(LAPIC_ICR2, 0);
-	lapic_write_around(LAPIC_ICR, LAPIC_INT_ASSERT | LAPIC_DM_INIT | LAPIC_DEST_ALLBUT);
+	unsigned long send_status;
+	unsigned long id;
+
+	id = lapic_read(LAPIC_ID) >> 24;
+
+	printk(BIOS_DEBUG, "CPU %ld going down...\n", id);
+
+	/* send an LAPIC INIT to myself */
+	lapic_write_around(LAPIC_ICR2, SET_LAPIC_DEST_FIELD(id));
+	lapic_write_around(LAPIC_ICR, LAPIC_INT_LEVELTRIG | LAPIC_INT_ASSERT | LAPIC_DM_INIT);
 
 	/* wait for the ipi send to finish */
+#if DEBUG_HALT_SELF
 	printk(BIOS_SPEW, "Waiting for send to finish...\n");
+#endif
 	timeout = 0;
 	do {
+#if DEBUG_HALT_SELF
 		printk(BIOS_SPEW, "+");
+#endif
 		udelay(100);
 		send_status = lapic_read(LAPIC_ICR) & LAPIC_ICR_BUSY;
 	} while (send_status && (timeout++ < 1000));
 	if (timeout >= 1000) {
+#if DEBUG_HALT_SELF
 		printk(BIOS_ERR, "timed out\n");
+#endif
 	}
 	mdelay(10);
+
+#if DEBUG_HALT_SELF
+	printk(BIOS_SPEW, "Deasserting INIT.\n");
+#endif
+	/* Deassert the LAPIC INIT */
+	lapic_write_around(LAPIC_ICR2, SET_LAPIC_DEST_FIELD(id));
+	lapic_write_around(LAPIC_ICR, LAPIC_INT_LEVELTRIG | LAPIC_DM_INIT);
+
+#if DEBUG_HALT_SELF
+	printk(BIOS_SPEW, "Waiting for send to finish...\n");
+#endif
+	timeout = 0;
+	do {
+#if DEBUG_HALT_SELF
+		printk(BIOS_SPEW, "+");
+#endif
+		udelay(100);
+		send_status = lapic_read(LAPIC_ICR) & LAPIC_ICR_BUSY;
+	} while (send_status && (timeout++ < 1000));
+	if (timeout >= 1000) {
+#if DEBUG_HALT_SELF
+		printk(BIOS_ERR, "timed out\n");
+#endif
+	}
+
+	while(1) {
+		hlt();
+	}
 }
+#endif
 
 #ifdef __SSE3__
 static __inline__ __attribute__((always_inline)) unsigned long readcr4(void)
@@ -208,21 +373,66 @@ static __inline__ __attribute__((always_inline)) void writecr4(unsigned long Dat
 #endif
 
 /* C entry point of secondary cpus */
-void secondary_cpu_init(int index)
+void secondary_cpu_init(void)
 {
+	atomic_inc(&active_cpus);
+#if CONFIG_SERIAL_CPU_INIT
+	spin_lock(&start_cpu_lock);
+#endif
+
 #ifdef __SSE3__
-        /*
-         * Seems that CR4 was cleared when AP start via lapic_start_cpu()
-         * Turn on CR4.OSFXSR and CR4.OSXMMEXCPT when SSE options enabled
-         */
-        u32 cr4_val;
-        cr4_val = readcr4();
-        cr4_val |= (1 << 9 | 1 << 10);
-        writecr4(cr4_val);
+	/*
+	 * Seems that CR4 was cleared when AP start via lapic_start_cpu()
+	 * Turn on CR4.OSFXSR and CR4.OSXMMEXCPT when SSE options enabled
+	 */
+	u32 cr4_val;
+	cr4_val = readcr4();
+	cr4_val |= (1 << 9 | 1 << 10);
+	writecr4(cr4_val);
 #endif
-	atomic_inc(&active_cpus);
-	cpu_initialize(current_cpu_bus, index);
+	cpu_initialize();
+#if CONFIG_SERIAL_CPU_INIT
+	spin_unlock(&start_cpu_lock);
+#endif
+
 	atomic_dec(&active_cpus);
+
+	stop_this_cpu();
+}
+
+static void start_other_cpus(struct bus *cpu_bus, device_t bsp_cpu)
+{
+	device_t cpu;
+	/* Loop through the cpus once getting them started */
+
+	for(cpu = cpu_bus->children; cpu ; cpu = cpu->sibling) {
+		if (cpu->path.type != DEVICE_PATH_APIC) {
+			continue;
+		}
+	#if !CONFIG_SERIAL_CPU_INIT
+		if(cpu==bsp_cpu) {
+			continue;
+		}
+	#endif
+
+		if (!cpu->enabled) {
+			continue;
+		}
+
+		if (cpu->initialized) {
+			continue;
+		}
+
+		if (!start_cpu(cpu)) {
+			/* Record the error in cpu? */
+			printk(BIOS_ERR, "CPU 0x%02x would not start!\n",
+				cpu->path.apic.apic_id);
+		}
+#if CONFIG_SERIAL_CPU_INIT
+		udelay(10);
+#endif
+	}
+
 }
 
 static void wait_other_cpus_stop(struct bus *cpu_bus)
@@ -255,7 +465,6 @@ static void wait_other_cpus_stop(struct bus *cpu_bus)
 				cpu->path.apic.apic_id);
 		}
 	}
-	stop_all_ap_cpus();
 	printk(BIOS_DEBUG, "All AP CPUs stopped (%ld loops)\n", loopcount);
 }
 
@@ -264,6 +473,10 @@ static void wait_other_cpus_stop(struct bus *cpu_bus)
 void initialize_cpus(struct bus *cpu_bus)
 {
 	struct device_path cpu_path;
+	struct cpu_info *info;
+
+	/* Find the info struct for this cpu */
+	info = cpu_info();
 
 #if NEED_LAPIC == 1
 	/* Ensure the local apic is enabled */
@@ -278,6 +491,9 @@ void initialize_cpus(struct bus *cpu_bus)
 	cpu_path.cpu.id       = 0;
 #endif
 
+	/* Find the device structure for the boot cpu */
+	info->cpu = alloc_find_dev(cpu_bus, &cpu_path);
+
 #if CONFIG_SMP
 	copy_secondary_start_to_1m_below(); // why here? In case some day we can start core1 in amd_sibling_init
 #endif
@@ -288,11 +504,21 @@ void initialize_cpus(struct bus *cpu_bus)
 
 	cpus_ready_for_init();
 
+#if CONFIG_SMP
+	#if !CONFIG_SERIAL_CPU_INIT
+	/* start all aps at first, so we can init ECC all together */
+	start_other_cpus(cpu_bus, info->cpu);
+	#endif
+#endif
+
 	/* Initialize the bootstrap processor */
-	cpu_initialize(cpu_bus, 0);
+	cpu_initialize();
 
 #if CONFIG_SMP
-	lapic_start_cpus(cpu_bus);
+	#if CONFIG_SERIAL_CPU_INIT
+	start_other_cpus(cpu_bus, info->cpu);
+	#endif
+
 	/* Now wait the rest of the cpus stop*/
 	wait_other_cpus_stop(cpu_bus);
 #endif
diff --git a/src/cpu/x86/lapic/secondary.S b/src/cpu/x86/lapic/secondary.S
index e6650ecf5a..ec1bd9c4d4 100644
--- a/src/cpu/x86/lapic/secondary.S
+++ b/src/cpu/x86/lapic/secondary.S
@@ -2,7 +2,8 @@
 #include <cpu/x86/lapic_def.h>
 
 	.text
-	.globl _secondary_start, _secondary_start_end, cpucount, ap_protected_start
+	.globl _secondary_start, _secondary_start_end
+	.balign 4096
 _secondary_start:
 	.code16
 	cli
@@ -49,22 +50,13 @@ __ap_protected_start:
 	/* Load the Interrupt descriptor table */
 	lidt	idtarg
 
-	/* increment our cpu index */
-	movl	$1, %eax
-	lock	xadd %eax, cpucount
-	movl	%eax, %ecx
-
-	/* assign stack for this specific cpu */
-	mov	$_stack, %esp
-	mov	$CONFIG_STACK_SIZE, %ebx
-	mul	%ebx
-	add	%eax, %esp
+	/* Set the stack pointer, and flag that we are done */
+	xorl	%eax, %eax
+	movl	secondary_stack, %esp
+	movl	%eax, secondary_stack
 
-	pushl	%ecx
 	call	secondary_cpu_init
 1:	hlt
 	jmp	1b
 
-cpucount:
-	.long	1
 .code32