[Nouveau] [PATCH v3 1/3] nvbios/power_budget: Add basic power budget parsing
Karol Herbst
karolherbst at gmail.com
Wed Nov 30 23:26:57 UTC 2016
2016-11-30 23:56 GMT+01:00 Karol Herbst <karolherbst at gmail.com>:
> 2016-11-30 23:48 GMT+01:00 Ben Skeggs <skeggsb at gmail.com>:
>> On 12/01/2016 05:48 AM, Karol Herbst wrote:
>>> 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
>>>
>>> Signed-off-by: Karol Herbst <karolherbst at gmail.com>
>>> ---
>>> .../include/nvkm/subdev/bios/power_budget.h | 25 +++++
>>> drm/nouveau/nvkm/subdev/bios/Kbuild | 1 +
>>> drm/nouveau/nvkm/subdev/bios/power_budget.c | 125 +++++++++++++++++++++
>>> 3 files changed, 151 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 00000000..89fd4a7a
>>> --- /dev/null
>>> +++ b/drm/nouveau/include/nvkm/subdev/bios/power_budget.h
>>> @@ -0,0 +1,25 @@
>>> +#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 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/drm/nouveau/nvkm/subdev/bios/Kbuild b/drm/nouveau/nvkm/subdev/bios/Kbuild
>>> index be57220a..6b4f1e06 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 00000000..04c69095
>>> --- /dev/null
>>> +++ b/drm/nouveau/nvkm/subdev/bios/power_budget.c
>>> @@ -0,0 +1,125 @@
>>> +/*
>>> + * 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 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_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;
>>> +
>>> + budget->offset = header;
>>> + budget->hlen = hdr;
>>> + budget->elen = len;
>>> + budget->ecount = cnt;
>>> +
>>> + 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->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->elen >= 0xe) {
>> I question this check. Generally, when the layout of existing fields
>> changes, there's a version bump to check against. The length is
>> increased when new fields are added without disturbing the previous ones.
>>
>
> and I say this doesn't hold up with this table, because this one is stupid :p
>
> found lengths:
>
> version 10:
> 0x0c, 0x1d
>
> version 20:
> 0x0d, 0x1f
>
> version 30:
> 0x1f, 0x22
>
uhh my mistake, you meant the entry size, anyway in the vbios
repository are enough examples which show that the length indeed
varries and that we can't simply depend on the version here. Also this
was taken from nvbios mainly.
>>> + 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;
>>> +}
>>>
>>
>>
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