[PATCH V5 3/3] skiboot: Update IMC PMU node names for power10

[Athira Rajeev]

The nest IMC (In Memory Collection) Performance Monitoring
Unit(PMU) node names are saved as "struct nest_pmus_struct"
in the "hw/imc.c" IMC code. Not all the IMC PMUs listed in
the device tree may be available. Nest IMC PMU names along with
their bit values is represented in imc availability vector.
This struct is used to remove the unavailable nodes by checking
this vector.

For power10, the imc_chip_avl_vector ie, imc availability vector
( which is a part of the IMC control block structure ), has
change in mapping of units and bit positions. Hence rename the
existing nest_pmus array to nest_pmus_p9 and add entry for power10
as nest_pmus_p10.

Also the avl_vector has another change in bit positions 11:34. These
bit positions tells the availability of Xlink/Alink/CAPI. There
are total 8 links and three bit field combination says which link
is available. Patch implements all these change to handle
nest_pmus_p10.

Signed-off-by: Athira Rajeev <atrajeev at linux.vnet.ibm.com>
---
Changelog:
v4 -> v5:
- Addressed review comment from Reza and renamed
  dt_find_by_name_substr to dt_find_by_name_before_addr.
  Instead of using multiple variables for link name, reuse
  one variable.

v3 -> v4:
- Addressed review comment from Mahesh and added his Reviewed-by
  for patch 1.

v2 -> v3:
- After review comments from Mahesh, fixed the code
  to consider string upto "@" for both input node name
  as well as child node name. V2 version was comparing
  input node name and child node name upto string length
  of child name. But this will return wrong node if input
  name is larger than child name. Because it will match
  as substring for child name.
  https://lists.ozlabs.org/pipermail/skiboot/2023-January/018596.html

v1 -> v2:
- Addressed review comment from Dan to update
  the utility funtion to search and compare
  upto "@". Renamed it as dt_find_by_name_substr.

 hw/imc.c | 196 ++++++++++++++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 186 insertions(+), 10 deletions(-)

diff --git a/hw/imc.c b/hw/imc.c
index a8198321..fd58058d 100644
--- a/hw/imc.c
+++ b/hw/imc.c
@@ -48,7 +48,7 @@ static unsigned int *htm_scom_index;
  * imc_chip_avl_vector(in struct imc_chip_cb, look at include/imc.h).
  * nest_pmus[] is an array containing all the possible nest IMC PMU node names.
  */
-static char const *nest_pmus[] = {
+static const char *nest_pmus_p9[] = {
 	"powerbus0",
 	"mcs0",
 	"mcs1",
@@ -103,6 +103,67 @@ static char const *nest_pmus[] = {
 	/* reserved bits : 51 - 63 */
 };
 
+static const char *nest_pmus_p10[] = {
+	"pb",
+	"mcs0",
+	"mcs1",
+	"mcs2",
+	"mcs3",
+	"mcs4",
+	"mcs5",
+	"mcs6",
+	"mcs7",
+	"pec0",
+	"pec1",
+	"NA",
+	"NA",
+	"NA",
+	"NA",
+	"NA",
+	"NA",
+	"NA",
+	"NA",
+	"NA",
+	"NA",
+	"NA",
+	"NA",
+	"NA",
+	"NA",
+	"NA",
+	"NA",
+	"NA",
+	"NA",
+	"NA",
+	"NA",
+	"NA",
+	"NA",
+	"NA",
+	"NA",
+	"phb0",
+	"phb1",
+	"phb2",
+	"phb3",
+	"phb4",
+	"phb5",
+	"ocmb0",
+	"ocmb1",
+	"ocmb2",
+	"ocmb3",
+	"ocmb4",
+	"ocmb5",
+	"ocmb6",
+	"ocmb7",
+	"ocmb8",
+	"ocmb9",
+	"ocmb10",
+	"ocmb11",
+	"ocmb12",
+	"ocmb13",
+	"ocmb14",
+	"ocmb15",
+	"nx",
+};
+
 /*
  * Due to Nest HW/OCC restriction, microcode will not support individual unit
  * events for these nest units mcs0, mcs1 ... mcs7 in the accumulation mode.
@@ -370,7 +431,7 @@ static void disable_unavailable_units(struct dt_node *dev)
 	uint64_t avl_vec;
 	struct imc_chip_cb *cb;
 	struct dt_node *target;
-	int i;
+	int i, j;
 	bool disable_all_nests = false;
 	struct proc_chip *chip;
 
@@ -408,14 +469,129 @@ static void disable_unavailable_units(struct dt_node *dev)
 			avl_vec = (0xffULL) << 56;
 	}
 
-	for (i = 0; i < ARRAY_SIZE(nest_pmus); i++) {
-		if (!(PPC_BITMASK(i, i) & avl_vec)) {
-			/* Check if the device node exists */
-			target = dt_find_by_name_before_addr(dev, nest_pmus[i]);
-			if (!target)
-				continue;
-			/* Remove the device node */
-			dt_free(target);
+	if (proc_gen == proc_gen_p9) {
+		for (i = 0; i < ARRAY_SIZE(nest_pmus_p9); i++) {
+			if (!(PPC_BITMASK(i, i) & avl_vec)) {
+				/* Check if the device node exists */
+				target = dt_find_by_name_before_addr(dev, nest_pmus_p9[i]);
+				if (!target)
+					continue;
+				/* Remove the device node */
+				dt_free(target);
+			}
+		}
+	} else if (proc_gen == proc_gen_p10) {
+		int val;
+		char name[8];
+
+		for (i = 0; i < 11; i++) {
+			if (!(PPC_BITMASK(i, i) & avl_vec)) {
+				/* Check if the device node exists */
+				target = dt_find_by_name_before_addr(dev, nest_pmus_p10[i]);
+				if (!target)
+					continue;
+				/* Remove the device node */
+				dt_free(target);
+			}
+		}
+
+		for (i = 35; i < 41; i++) {
+			if (!(PPC_BITMASK(i, i) & avl_vec)) {
+				/* Check if the device node exists for phb */
+				for (j = 0; j < 3; j++) {
+					snprintf(name, sizeof(name), "phb%d_%d", (i-35), j);
+					target = dt_find_by_name_before_addr(dev, name);
+					if (!target)
+						continue;
+					/* Remove the device node */
+					dt_free(target);
+				}
+			}
+		}
+
+		for (i = 41; i < 58; i++) {
+			if (!(PPC_BITMASK(i, i) & avl_vec)) {
+				/* Check if the device node exists */
+				target = dt_find_by_name_before_addr(dev, nest_pmus_p10[i]);
+				if (!target)
+					continue;
+				/* Remove the device node */
+				dt_free(target);
+			}
+		}
+
+		for (i = 0; i < 8; i++) {
+			val = ((avl_vec & (0x7ULL << (29 + (3 * i)))) >> (29 + (3 * i)));
+			switch (val) {
+			case 0x5: //xlink configured and functional
+
+				snprintf(name, sizeof(name), "alink%1d", (7-i));
+				target = dt_find_by_name_before_addr(dev, name);
+				if (target)
+					dt_free(target);
+
+				snprintf(name, sizeof(name), "otl%1d_0", (7-i));
+				target = dt_find_by_name_before_addr(dev, name);
+				if (target)
+					dt_free(target);
+
+				snprintf(name, sizeof(name), "otl%1d_1", (7-i));
+				target = dt_find_by_name_before_addr(dev, name);
+				if (target)
+					dt_free(target);
+
+				break;
+			case 0x6: //alink configured and functional
+
+				snprintf(name, sizeof(name), "xlink%1d", (7-i));
+				target = dt_find_by_name_before_addr(dev, name);
+				if (target)
+					dt_free(target);
+
+				snprintf(name, sizeof(name), "otl%1d_0", (7-i));
+				target = dt_find_by_name_before_addr(dev, name);
+				if (target)
+					dt_free(target);
+
+				snprintf(name, sizeof(name), "otl%1d_1", (7-i));
+				target = dt_find_by_name_before_addr(dev, name);
+				if (target)
+					dt_free(target);
+				break;
+
+			case 0x7: //CAPI configured and functional
+				snprintf(name, sizeof(name), "alink%1d", (7-i));
+				target = dt_find_by_name_before_addr(dev, name);
+				if (target)
+					dt_free(target);
+
+				snprintf(name, sizeof(name), "xlink%1d", (7-i));
+				target = dt_find_by_name_before_addr(dev, name);
+				if (target)
+					dt_free(target);
+				break;
+			default:
+				snprintf(name, sizeof(name), "xlink%1d", (7-i));
+				target = dt_find_by_name_before_addr(dev, name);
+				if (target)
+					dt_free(target);
+
+				snprintf(name, sizeof(name), "alink%1d", (7-i));
+				target = dt_find_by_name_before_addr(dev, name);
+				if (target)
+					dt_free(target);
+
+				snprintf(name, sizeof(name), "otl%1d_0", (7-i));
+				target = dt_find_by_name_before_addr(dev, name);
+				if (target)
+					dt_free(target);
+
+				snprintf(name, sizeof(name), "otl%1d_1", (7-i));
+				target = dt_find_by_name_before_addr(dev, name);
+				if (target)
+					dt_free(target);
+				break;
+			}
 		}
 	}
 
-- 
2.39.3