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[PATCH 3/8] ppc/pnv: Add a comment on the "primary-topology-index" prope
From: |
Cédric Le Goater |
Subject: |
[PATCH 3/8] ppc/pnv: Add a comment on the "primary-topology-index" property |
Date: |
Wed, 1 Sep 2021 11:41:48 +0200 |
On P10, the chip id is calculated from the "Primary topology table
index". See skiboot commits for more information [1].
This information is extracted from the hdata on real systems which
QEMU needs to emulate. Add this property for all machines even if it
is only used on POWER10.
[1] https://github.com/open-power/skiboot/commit/2ce3f083f399
https://github.com/open-power/skiboot/commit/a2d4d7f9e14a
Signed-off-by: Cédric Le Goater <clg@kaod.org>
---
hw/ppc/pnv_xscom.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/hw/ppc/pnv_xscom.c b/hw/ppc/pnv_xscom.c
index faa488e3117a..9ce018dbc279 100644
--- a/hw/ppc/pnv_xscom.c
+++ b/hw/ppc/pnv_xscom.c
@@ -284,6 +284,10 @@ int pnv_dt_xscom(PnvChip *chip, void *fdt, int root_offset,
_FDT(xscom_offset);
g_free(name);
_FDT((fdt_setprop_cell(fdt, xscom_offset, "ibm,chip-id", chip->chip_id)));
+ /*
+ * On P10, the xscom bus id has been deprecated and the chip id is
+ * calculated from the "Primary topology table index". See skiboot.
+ */
_FDT((fdt_setprop_cell(fdt, xscom_offset, "ibm,primary-topology-index",
chip->chip_id)));
_FDT((fdt_setprop_cell(fdt, xscom_offset, "#address-cells", 1)));
--
2.31.1