powerpc/powernv: Capture actag information for the device
In the opencapi protocol, host memory contexts are referenced by a
'actag'. During setup, a driver must tell the device how many actags
it can used, and what values are acceptable.
On POWER9, the NPU can handle 64 actags per link, so they must be
shared between all the PCI functions of the link. To get a global
picture of how many actags are used by each AFU of every function, we
capture some data at the end of PCI enumeration, so that actags can be
shared fairly if needed.
This is not powernv specific per say, but rather a consequence of the
opencapi configuration specification being quite general. The number
of available actags on POWER9 makes it more likely to be hit. This is
somewhat mitigated by the fact that existing AFUs are coded by
requesting a reasonable count of actags and existing devices carry
only one AFU.
Signed-off-by: Frederic Barrat <fbarrat@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
diff --git a/include/misc/ocxl-config.h b/include/misc/ocxl-config.h
new file mode 100644
index 0000000..3526fa9
--- /dev/null
+++ b/include/misc/ocxl-config.h
@@ -0,0 +1,45 @@
+// SPDX-License-Identifier: GPL-2.0+
+// Copyright 2017 IBM Corp.
+#ifndef _OCXL_CONFIG_H_
+#define _OCXL_CONFIG_H_
+
+/*
+ * This file lists the various constants used to read the
+ * configuration space of an opencapi adapter.
+ *
+ * It follows the specification for opencapi 3.0
+ */
+
+#define OCXL_EXT_CAP_ID_DVSEC 0x23
+
+#define OCXL_DVSEC_VENDOR_OFFSET 0x4
+#define OCXL_DVSEC_ID_OFFSET 0x8
+#define OCXL_DVSEC_TL_ID 0xF000
+#define OCXL_DVSEC_TL_BACKOFF_TIMERS 0x10
+#define OCXL_DVSEC_TL_RECV_CAP 0x18
+#define OCXL_DVSEC_TL_SEND_CAP 0x20
+#define OCXL_DVSEC_TL_RECV_RATE 0x30
+#define OCXL_DVSEC_TL_SEND_RATE 0x50
+#define OCXL_DVSEC_FUNC_ID 0xF001
+#define OCXL_DVSEC_FUNC_OFF_INDEX 0x08
+#define OCXL_DVSEC_FUNC_OFF_ACTAG 0x0C
+#define OCXL_DVSEC_AFU_INFO_ID 0xF003
+#define OCXL_DVSEC_AFU_INFO_AFU_IDX 0x0A
+#define OCXL_DVSEC_AFU_INFO_OFF 0x0C
+#define OCXL_DVSEC_AFU_INFO_DATA 0x10
+#define OCXL_DVSEC_AFU_CTRL_ID 0xF004
+#define OCXL_DVSEC_AFU_CTRL_AFU_IDX 0x0A
+#define OCXL_DVSEC_AFU_CTRL_TERM_PASID 0x0C
+#define OCXL_DVSEC_AFU_CTRL_ENABLE 0x0F
+#define OCXL_DVSEC_AFU_CTRL_PASID_SUP 0x10
+#define OCXL_DVSEC_AFU_CTRL_PASID_EN 0x11
+#define OCXL_DVSEC_AFU_CTRL_PASID_BASE 0x14
+#define OCXL_DVSEC_AFU_CTRL_ACTAG_SUP 0x18
+#define OCXL_DVSEC_AFU_CTRL_ACTAG_EN 0x1A
+#define OCXL_DVSEC_AFU_CTRL_ACTAG_BASE 0x1C
+#define OCXL_DVSEC_VENDOR_ID 0xF0F0
+#define OCXL_DVSEC_VENDOR_CFG_VERS 0x0C
+#define OCXL_DVSEC_VENDOR_TLX_VERS 0x10
+#define OCXL_DVSEC_VENDOR_DLX_VERS 0x20
+
+#endif /* _OCXL_CONFIG_H_ */