drm/nouveau/bios/power_budget: Add basic power budget parsing

v2: Set entry to 0xff if not found
    Add cap entry for ver 0x30 tables
    Rework to fix memory leak
v3: More error checks
    Simplify check for invalid entries
v4: disable for ver 0x10 for now
    move assignments after the second last return

Signed-off-by: Karol Herbst <karolherbst@gmail.com>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

diff --git a/drivers/gpu/drm/nouveau/include/nvkm/subdev/bios/power_budget.h b/drivers/gpu/drm/nouveau/include/nvkm/subdev/bios/power_budget.h
new file mode 100644 (file)
index 0000000..f5f4a14
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/include/nvkm/subdev/bios/power_budget.h
@@ -0,0 +1,26 @@
+#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 {
+       u32 offset;
+       u8  ver;
+       u8  hlen;
+       u8  elen;
+       u8  ecount;
+       u8  cap_entry;
+};
+
+int nvbios_power_budget_header(struct nvkm_bios *,
+                               struct nvbios_power_budget *);
+int nvbios_power_budget_entry(struct nvkm_bios *, struct nvbios_power_budget *,
+                              u8 idx, struct nvbios_power_budget_entry *);
+
+#endif

diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/bios/Kbuild b/drivers/gpu/drm/nouveau/nvkm/subdev/bios/Kbuild
index be57220a2e01455d03355485547329a9231f5f39..6b4f1e06a38f90c1d8d492e6051e0c8a97bc8964 100644 (file)
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/bios/Kbuild
+++ b/drivers/gpu/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/drivers/gpu/drm/nouveau/nvkm/subdev/bios/power_budget.c b/drivers/gpu/drm/nouveau/nvkm/subdev/bios/power_budget.c
new file mode 100644 (file)
index 0000000..617bfff
--- /dev/null
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/bios/power_budget.c
@@ -0,0 +1,126 @@
+/*
+ * Copyright 2016 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 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_header(struct nvkm_bios *bios,
+                           struct nvbios_power_budget *budget)
+{
+       struct nvkm_subdev *subdev = &bios->subdev;
+       u8 ver, hdr, cnt, len, cap_entry;
+       u32 header;
+
+       if (!bios || !budget)
+               return -EINVAL;
+
+       header = nvbios_power_budget_table(bios, &ver, &hdr, &cnt, &len);
+       if (!header || !cnt)
+               return -ENODEV;
+
+       switch (ver) {
+       case 0x20:
+               cap_entry = nvbios_rd08(bios, header + 0x9);
+               break;
+       case 0x30:
+               cap_entry = nvbios_rd08(bios, header + 0xa);
+               break;
+       default:
+               cap_entry = 0xff;
+       }
+
+       if (cap_entry >= cnt && cap_entry != 0xff) {
+               nvkm_warn(subdev,
+                         "invalid cap_entry in power budget table found\n");
+               budget->cap_entry = 0xff;
+               return -EINVAL;
+       }
+
+       budget->offset = header;
+       budget->ver = ver;
+       budget->hlen = hdr;
+       budget->elen = len;
+       budget->ecount = cnt;
+
+       budget->cap_entry = cap_entry;
+
+       return 0;
+}
+
+int
+nvbios_power_budget_entry(struct nvkm_bios *bios,
+                          struct nvbios_power_budget *budget,
+                          u8 idx, struct nvbios_power_budget_entry *entry)
+{
+       u32 entry_offset;
+
+       if (!bios || !budget || !budget->offset || idx >= budget->ecount
+               || !entry)
+               return -EINVAL;
+
+       entry_offset = budget->offset + budget->hlen + idx * budget->elen;
+
+       if (budget->ver >= 0x20) {
+               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;
+}