Add basic P9 fused core support

P9 cores can be configured into fused core mode where two core chiplets
function as an 8-threaded, single core.  So, bump four to eight in boot_entry
when in fused core mode and cpu_thread_count in init_boot_cpu.

The HID, AMOR, TSCR, RPR require the first active thread on that core chiplet
to load the copy for that core chiplet.  So, send thread 1 of a fused core to
init_shared_sprs in boot_entry.

The code checks for fused core mode in the core thead state register and puts a
field in struct cpu_thread.  This flag is checked when updating the HID and in
XIVE code when setting the special bar.

For XSCOM, the core ID is the non-fused EX.  So, create macros to arrange the
bits.  It's fairly verbose but somewhat readable.

This was tested on a P9 ZZ with 16 fused cores and ran HTX for over 24 hours.

Signed-off-by: Ryan Grimm <grimm@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Michael Neuling <mikey@neuling.org>
Signed-off-by: Vaidyanathan Srinivasan <svaidy@linux.ibm.com>
Signed-off-by: Oliver O'Halloran <oohall@gmail.com>

1 files changed, 8 insertions, 1 deletions

diff --git a/hdata/test/hdata_to_dt.c b/hdata/test/hdata_to_dt.c
index 49357cd..90d83f9 100644
--- a/hdata/test/hdata_to_dt.c
+++ b/hdata/test/hdata_to_dt.c
@@ -38,7 +38,11 @@ struct spira_ntuple;
 static void *ntuple_addr(const struct spira_ntuple *n);
 
 /* Stuff which core expects. */
-#define __this_cpu ((struct cpu_thread *)NULL)
+struct cpu_thread *my_fake_cpu;
+static struct cpu_thread *this_cpu(void)
+{
+	return my_fake_cpu;
+}
 
 unsigned long tb_hz = 512000000;
 
@@ -74,6 +78,7 @@ unsigned long tb_hz = 512000000;
 struct cpu_thread {
 	uint32_t			pir;
 	uint32_t			chip_id;
+	bool				is_fused_core;
 };
 struct cpu_job *__cpu_queue_job(struct cpu_thread *cpu,
 				const char *name,
@@ -95,6 +100,8 @@ static inline struct cpu_job *cpu_queue_job(struct cpu_thread *cpu,
 struct cpu_thread __boot_cpu, *boot_cpu = &__boot_cpu;
 static unsigned long fake_pvr = PVR_P8;
 
+unsigned int cpu_thread_count = 8;
+
 static inline unsigned long mfspr(unsigned int spr)
 {
 	assert(spr == SPR_PVR);