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authorDavid S. Miller <davem@sunset.davemloft.net>2006-02-17 04:29:17 -0500
committerDavid S. Miller <davem@sunset.davemloft.net>2006-03-20 04:13:22 -0500
commit72aff53f1fe74153eccef303ab2f79de888d248c (patch)
treea229645be99274d36bed04bed355d74ec3c0baa2 /arch/sparc64/kernel/smp.c
parent19a0d585e80e84b54bb9bf120bf0c826045dd3dd (diff)
[SPARC64]: Get SUN4V SMP working.
The sibling cpu bringup is extremely fragile. We can only perform the most basic calls until we take over the trap table from the firmware/hypervisor on the new cpu. This means no accesses to %g4, %g5, %g6 since those can't be TLB translated without our trap handlers. In order to achieve this: 1) Change sun4v_init_mondo_queues() so that it can operate in several modes. It can allocate the queues, or install them in the current processor, or both. The boot cpu does both in it's call early on. Later, the boot cpu allocates the sibling cpu queue, starts the sibling cpu, then the sibling cpu loads them in. 2) init_cur_cpu_trap() is changed to take the current_thread_info() as an argument instead of reading %g6 directly on the current cpu. 3) Create a trampoline stack for the sibling cpus. We do our basic kernel calls using this stack, which is locked into the kernel image, then go to our proper thread stack after taking over the trap table. 4) While we are in this delicate startup state, we put 0xdeadbeef into %g4/%g5/%g6 in order to catch accidental accesses. 5) On the final prom_set_trap_table*() call, we put &init_thread_union into %g6. This is a hack to make prom_world(0) work. All that wants to do is restore the %asi register using get_thread_current_ds(). Longer term we should just do the OBP calls to set the trap table by hand just like we do for everything else. This would avoid that silly prom_world(0) issue, then we can remove the init_thread_union hack. Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch/sparc64/kernel/smp.c')
-rw-r--r--arch/sparc64/kernel/smp.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/sparc64/kernel/smp.c b/arch/sparc64/kernel/smp.c
index 527dfd7ae210..b586345fe3b9 100644
--- a/arch/sparc64/kernel/smp.c
+++ b/arch/sparc64/kernel/smp.c
@@ -316,6 +316,8 @@ static void smp_synchronize_one_tick(int cpu)
316 spin_unlock_irqrestore(&itc_sync_lock, flags); 316 spin_unlock_irqrestore(&itc_sync_lock, flags);
317} 317}
318 318
319extern void sun4v_init_mondo_queues(int use_bootmem, int cpu, int alloc, int load);
320
319extern unsigned long sparc64_cpu_startup; 321extern unsigned long sparc64_cpu_startup;
320 322
321/* The OBP cpu startup callback truncates the 3rd arg cookie to 323/* The OBP cpu startup callback truncates the 3rd arg cookie to
@@ -339,6 +341,9 @@ static int __devinit smp_boot_one_cpu(unsigned int cpu)
339 cpu_set(cpu, cpu_callout_map); 341 cpu_set(cpu, cpu_callout_map);
340 342
341 if (tlb_type == hypervisor) { 343 if (tlb_type == hypervisor) {
344 /* Alloc the mondo queues, cpu will load them. */
345 sun4v_init_mondo_queues(0, cpu, 1, 0);
346
342 prom_startcpu_cpuid(cpu, entry, cookie); 347 prom_startcpu_cpuid(cpu, entry, cookie);
343 } else { 348 } else {
344 int cpu_node; 349 int cpu_node;
@@ -352,6 +357,7 @@ static int __devinit smp_boot_one_cpu(unsigned int cpu)
352 break; 357 break;
353 udelay(100); 358 udelay(100);
354 } 359 }
360
355 if (callin_flag) { 361 if (callin_flag) {
356 ret = 0; 362 ret = 0;
357 } else { 363 } else {