[Nouveau] [PATCH 1/3] nvbios/power_budget: Add basic power budget parsing

[Karol Herbst]

Signed-off-by: Karol Herbst <karolherbst at gmail.com>
---
 .../include/nvkm/subdev/bios/power_budget.h        |  20 ++++
 drm/nouveau/nvkm/subdev/bios/Kbuild                |   1 +
 drm/nouveau/nvkm/subdev/bios/power_budget.c        | 108 +++++++++++++++++++++
 3 files changed, 129 insertions(+)
 create mode 100644 drm/nouveau/include/nvkm/subdev/bios/power_budget.h
 create mode 100644 drm/nouveau/nvkm/subdev/bios/power_budget.c

diff --git a/drm/nouveau/include/nvkm/subdev/bios/power_budget.h b/drm/nouveau/include/nvkm/subdev/bios/power_budget.h
new file mode 100644
index 0000000..dd65c08
--- /dev/null
+++ b/drm/nouveau/include/nvkm/subdev/bios/power_budget.h
@@ -0,0 +1,20 @@
+#ifndef __NVBIOS_POWER_BUDGET_H__
+#define __NVBIOS_POWER_BUDGET_H__
+
+#include <nvkm/subdev/bios.h>
+
+struct nvbios_power_budget_entry {
+	u32 min_w;
+	u32 avg_w;
+	u32 max_w;
+};
+
+struct nvbios_power_budget {
+	u8  nr_entry;
+	u8  cap_entry;
+	struct nvbios_power_budget_entry *entries;
+};
+
+int nvbios_power_budget_parse(struct nvkm_bios *, struct nvbios_power_budget *);
+
+#endif
diff --git a/drm/nouveau/nvkm/subdev/bios/Kbuild b/drm/nouveau/nvkm/subdev/bios/Kbuild
index be57220..6b4f1e0 100644
--- a/drm/nouveau/nvkm/subdev/bios/Kbuild
+++ b/drm/nouveau/nvkm/subdev/bios/Kbuild
@@ -19,6 +19,7 @@ nvkm-y += nvkm/subdev/bios/pcir.o
 nvkm-y += nvkm/subdev/bios/perf.o
 nvkm-y += nvkm/subdev/bios/pll.o
 nvkm-y += nvkm/subdev/bios/pmu.o
+nvkm-y += nvkm/subdev/bios/power_budget.o
 nvkm-y += nvkm/subdev/bios/ramcfg.o
 nvkm-y += nvkm/subdev/bios/rammap.o
 nvkm-y += nvkm/subdev/bios/shadow.o
diff --git a/drm/nouveau/nvkm/subdev/bios/power_budget.c b/drm/nouveau/nvkm/subdev/bios/power_budget.c
new file mode 100644
index 0000000..538497b
--- /dev/null
+++ b/drm/nouveau/nvkm/subdev/bios/power_budget.c
@@ -0,0 +1,108 @@
+/*
+ * Copyright 2015 Karol Herbst
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ * Authors: Karol Herbst
+ */
+#include <subdev/bios.h>
+#include <subdev/bios/bit.h>
+#include <subdev/bios/power_budget.h>
+
+static u32
+nvbios_power_budget_table(struct nvkm_bios *bios, u8 *ver, u8 *hdr, u8 *cnt,
+			  u8 *len)
+{
+	struct bit_entry bit_P;
+	u32 power_budget;
+
+	if (bit_entry(bios, 'P', &bit_P) || bit_P.version != 2 ||
+	    bit_P.length < 0x2c)
+		return 0;
+
+	power_budget = nvbios_rd32(bios, bit_P.offset + 0x2c);
+	if (!power_budget)
+		return 0;
+
+	*ver = nvbios_rd08(bios, power_budget);
+	switch (*ver) {
+	case 0x10:
+	case 0x20:
+	case 0x30:
+		*hdr = nvbios_rd08(bios, power_budget + 0x1);
+		*len = nvbios_rd08(bios, power_budget + 0x2);
+		*cnt = nvbios_rd08(bios, power_budget + 0x3);
+		return power_budget;
+	default:
+		break;
+	}
+
+	return 0;
+}
+
+int
+nvbios_power_budget_parse(struct nvkm_bios *bios, struct nvbios_power_budget *budget)
+{
+	struct nvkm_subdev *subdev = &bios->subdev;
+	u8 ver, hdr, cnt, len, i, cap_entry;
+	u32 header;
+
+	header = nvbios_power_budget_table(bios, &ver, &hdr, &cnt, &len);
+	if (!header || !cnt)
+		return -ENODEV;
+
+	budget->entries = kmalloc_array(cnt, sizeof(*budget->entries), GFP_KERNEL);
+	if (!budget->entries)
+		return -ENOMEM;
+
+	budget->nr_entry = cnt;
+	switch (ver) {
+	case 0x20:
+		cap_entry = nvbios_rd08(bios, header + 0x9);
+		break;
+	default:
+		cap_entry = 0;
+	}
+
+	if (cap_entry < cnt)
+		budget->cap_entry = cap_entry;
+	else {
+		if (cap_entry != 0xff)
+			nvkm_warn(subdev,
+				  "invalid cap_entry in power budget table found\n");
+		budget->cap_entry = 0xff;
+	}
+
+	for (i = 0; i < cnt; ++i) {
+		u32 entry_offset = header + hdr + i * len;
+		struct nvbios_power_budget_entry *entry = &budget->entries[i];
+
+		if (len >= 0xe) {
+			entry->min_w = nvbios_rd32(bios, entry_offset + 0x2);
+			entry->avg_w = nvbios_rd32(bios, entry_offset + 0x6);
+			entry->max_w = nvbios_rd32(bios, entry_offset + 0xa);
+		} else {
+			entry->min_w = 0;
+			entry->max_w = nvbios_rd32(bios, entry_offset + 0x2);
+			entry->avg_w = entry->max_w;
+		}
+	}
+
+	return 0;
+}
-- 
2.10.0