linux-kernel - [PATCH v5 3/3] powerpc/powernv: Parse device tree, population of SPR support

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Date:   Tue, 17 Mar 2020 19:40:18 +0530
From:   Pratik Rajesh Sampat <psampat@...ux.ibm.com>
To:     linux-kernel@...r.kernel.org, linuxppc-dev@...abs.org,
        mpe@...erman.id.au, ego@...ux.vnet.ibm.com, linuxram@...ibm.com,
        psampat@...ibm.com, pratik.r.sampat@...il.com
Subject: [PATCH v5 3/3] powerpc/powernv: Parse device tree, population of SPR support

Parse the device tree for nodes self-save, self-restore and populate
support for the preferred SPRs based what was advertised by the device
tree.

Signed-off-by: Pratik Rajesh Sampat <psampat@...ux.ibm.com>
Reviewed-by: Ram Pai <linuxram@...ibm.com>
---
 .../bindings/powerpc/opal/power-mgt.txt       | 10 +++
 arch/powerpc/platforms/powernv/idle.c         | 78 +++++++++++++++++++
 2 files changed, 88 insertions(+)

diff --git a/Documentation/devicetree/bindings/powerpc/opal/power-mgt.txt b/Documentation/devicetree/bindings/powerpc/opal/power-mgt.txt
index 9d619e955576..093cb5fe3d2d 100644
--- a/Documentation/devicetree/bindings/powerpc/opal/power-mgt.txt
+++ b/Documentation/devicetree/bindings/powerpc/opal/power-mgt.txt
@@ -116,3 +116,13 @@ otherwise. The length of all the property arrays must be the same.
 	which of the fields of the PMICR are set in the corresponding
 	entries in ibm,cpu-idle-state-pmicr. This is an optional
 	property on POWER8 and is absent on POWER9.
+
+- self-restore:
+ Array of unsigned 64-bit values containing a property for sprn-mask
+ with each bit indicating the index of the supported SPR for the
+ functionality. This is an optional property for both Power8 and Power9
+
+- self-save:
+  Array of unsigned 64-bit values containing a property for sprn-mask
+  with each bit indicating the index of the supported SPR for the
+  functionality. This is an optional property for both Power8 and Power9
diff --git a/arch/powerpc/platforms/powernv/idle.c b/arch/powerpc/platforms/powernv/idle.c
index 97aeb45e897b..c39111b338ff 100644
--- a/arch/powerpc/platforms/powernv/idle.c
+++ b/arch/powerpc/platforms/powernv/idle.c
@@ -1436,6 +1436,81 @@ static void __init pnv_probe_idle_states(void)
 		supported_cpuidle_states |= pnv_idle_states[i].flags;
 }
 
+/*
+ * Extracts and populates the self save or restore capabilities
+ * passed from the device tree node
+ */
+static int extract_save_restore_state_dt(struct device_node *np, int type)
+{
+	int nr_sprns = 0, i, bitmask_index;
+	u64 *temp_u64;
+	u64 bit_pos;
+
+	nr_sprns = of_property_count_u64_elems(np, "sprn-bitmask");
+	if (nr_sprns <= 0)
+		return -EINVAL;
+	temp_u64 = kcalloc(nr_sprns, sizeof(u64), GFP_KERNEL);
+	if (of_property_read_u64_array(np, "sprn-bitmask",
+				       temp_u64, nr_sprns)) {
+		pr_warn("cpuidle-powernv: failed to find registers in DT\n");
+		kfree(temp_u64);
+		return -EINVAL;
+	}
+	/*
+	 * Populate acknowledgment of support for the sprs in the global vector
+	 * gotten by the registers supplied by the firmware.
+	 * The registers are in a bitmask, bit index within
+	 * that specifies the SPR
+	 */
+	for (i = 0; i < nr_preferred_sprs; i++) {
+		bitmask_index = BIT_WORD(preferred_sprs[i].spr);
+		bit_pos = BIT_MASK(preferred_sprs[i].spr);
+		if ((temp_u64[bitmask_index] & bit_pos) == 0) {
+			if (type == SELF_RESTORE_TYPE)
+				preferred_sprs[i].supported_mode &=
+					~SELF_RESTORE_STRICT;
+			else
+				preferred_sprs[i].supported_mode &=
+					~SELF_SAVE_STRICT;
+			continue;
+		}
+		if (type == SELF_RESTORE_TYPE) {
+			preferred_sprs[i].supported_mode |=
+				SELF_RESTORE_STRICT;
+		} else {
+			preferred_sprs[i].supported_mode |=
+				SELF_SAVE_STRICT;
+		}
+	}
+
+	kfree(temp_u64);
+	return 0;
+}
+
+static int pnv_parse_deepstate_dt(void)
+{
+	struct device_node *np;
+	int rc = 0, i;
+
+	/* Self restore register population */
+	np = of_find_compatible_node(NULL, NULL, "ibm,opal-self-restore");
+	if (np) {
+		rc = extract_save_restore_state_dt(np, SELF_RESTORE_TYPE);
+		if (rc != 0)
+			return rc;
+	}
+	/* Self save register population */
+	np = of_find_compatible_node(NULL, NULL, "ibm,opal-self-save");
+	if (!np) {
+		for (i = 0; i < nr_preferred_sprs; i++)
+			preferred_sprs[i].supported_mode &= ~SELF_SAVE_STRICT;
+	} else {
+		rc = extract_save_restore_state_dt(np, SELF_SAVE_TYPE);
+	}
+	of_node_put(np);
+	return rc;
+}
+
 /*
  * This function parses device-tree and populates all the information
  * into pnv_idle_states structure. It also sets up nr_pnv_idle_states
@@ -1584,6 +1659,9 @@ static int __init pnv_init_idle_states(void)
 		return rc;
 	pnv_probe_idle_states();
 
+	rc = pnv_parse_deepstate_dt();
+	if (rc)
+		return rc;
 	if (!cpu_has_feature(CPU_FTR_ARCH_300)) {
 		if (!(supported_cpuidle_states & OPAL_PM_SLEEP_ENABLED_ER1)) {
 			power7_fastsleep_workaround_entry = false;
-- 
2.17.1