hw/imc: Detect BML and fix core counters

On systems running BML we started noticing this in the skiboot log:

[  409.088819302,3] XSCOM: write error gcid=0x0 pcb_addr=0x20000060 stat=0x4
[  409.088823446,3] ELOG: Error getting buffer to log error
[  409.088824806,3] XSCOM: Write failed, ret =  -26
[  409.088825797,3] IMC: error in xscom_write for pdbar
[    0.468976][   T19] core_imc memory allocation for cpu 0 failed
[    0.468993][    T1] IMC PMU core_imc Register failed

I tracked down that bad pcb_addr to this line in the code:

        pdbar_addr = get_imc_scom_addr_for_quad(phys_core_id,
                                pdbar_scom_index[port_id]);

I found that pdbar_scom_index was not initialized because, like mambo, we don't
have the IMC catalog in memory.  So, in imc_init we error out and never
initialize it in setup_imc_scoms.

This patch adds a chip quirk QUIRK_BML because it seems like a reasonable thing
to do and it's easy to put a BML {}; in the device tree like Mambo, Awan, etc.

It is tested on a Rainier and errors are gone and /sys/devices/core_imc shows
up as expected.

Signed-off-by: Ryan Grimm <grimm@linux.ibm.com>
Reviewed-By: Madhavan Srinivasan <maddy@linux.ibm.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/include/chip.h b/include/chip.h
index cfa5ce3..c90b8a7 100644
--- a/include/chip.h
+++ b/include/chip.h
@@ -187,6 +187,7 @@ enum proc_chip_quirks {
 	QUIRK_NO_RNG		= 0x00000100,
 	QUIRK_QEMU              = 0x00000200,
 	QUIRK_AWAN		= 0x00000400,
+	QUIRK_BML		= 0x00000800,
 };
 
 extern enum proc_chip_quirks proc_chip_quirks;