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- bench.sh's pin_freqs writes /proc/ppm and /proc/gpufreq, which exist on neither 35d0befa (SM8750) nor 3B159D009VZ00000 (MT6993 dropped both for /proc/gpufreqv2); the guard the PROFILE_VERIFIED key exists for was about to be defeated on the device its own comment guessed was safe - pin_device.sh pins big/little/GPU through the nodes each device actually has (Xiaomi: policy6 1958400 / policy0 1555200 / kgsl pwrlevel 0; Oppo: policy4 2000000 + policy7 2000000 / policy0 1600000 / gpufreqv2 fix_target_opp_index 0), checks only against its own pins because ColorOS moves stock maxima by itself, and refuses to call a zero-key read a verdict - both profiles are PROFILE_VERIFIED=1 on 30 s pinned windows with zero drift; the evidence and the two things not verified (Oppo GPU held at DVFS-request level only, no full bench window) are in docs/Disaggregated/devices/pin-verification-2026-09-07.md
104 lines
5.9 KiB
Bash
104 lines
5.9 KiB
Bash
# Device profile: Xiaomi 24129PN74C, Snapdragon 8 Elite (SM8750, "sun"),
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# Adreno 830v2, adb serial 35d0befa.
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#
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# One of the two devices the disaggregation campaign is measured on (the other is
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# devices/oppo-mali.env). It exists so that the pinning and thermal protocol the campaign
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# actually runs is written down in the repository instead of living in one operator's shell
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# history, and so that a `--device` argument names something reviewable.
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#
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# ============================== DEVICE-VERIFIED ==============================
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# Read off the device on 2026-09-07 and confirmed against one pinned window: pins written,
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# 8 concurrent busy loops as load, scaling_cur_freq / gpuclk sampled 7 times over 30 s, every
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# sample equal to the pin, then unpinned and every node confirmed back at its stock value.
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# Evidence is in ../REPORT.md.
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#
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# READ THIS BEFORE USING IT WITH bench.sh / session.sh
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# ----------------------------------------------------
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# bench.sh's pin_freqs()/unpin_freqs() are MediaTek-only: they write /proc/ppm/policy/* and
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# /proc/gpufreq/gpufreq_opp_freq. NEITHER PATH EXISTS ON THIS DEVICE, and `su -c 'echo ... >
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# /proc/...'` against a missing path fails without a non-zero exit - which is the exact silent
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# failure the PROFILE_VERIFIED guard was built to prevent. PROFILE_VERIFIED=1 below certifies
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# THE NODES AND THE PINS IN THIS FILE, not that bench.sh can drive them.
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#
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# So until bench.sh grows a PIN_STYLE switch, drive the pin out of band:
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# tools/device_bench/pin_device.sh 35d0befa pin # before the run
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# tools/device_bench/bench.sh --device <this> --backend X --no-pin
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# tools/device_bench/pin_device.sh 35d0befa check # AFTER, exits non-zero on drift
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# tools/device_bench/pin_device.sh 35d0befa unpin
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# `--no-pin` is what keeps bench.sh from writing MediaTek paths into the void and labelling the
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# result pinned; pin_device.sh check is what replaces the pin-integrity fields it would have
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# sampled. (bench.sh's read_temp and its GPU-busy sampling ARE portable - they only read
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# /sys/class/thermal and $GPU_UTIL_NODE - so those fields stay meaningful.)
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# =============================================================================
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PROFILE_VERIFIED=1
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PIN_STYLE=qualcomm-kgsl
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DEVICE_SERIAL=35d0befa
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# --- CPU -------------------------------------------------------------------------------------
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# SM8750 is a 2+6 part with NO true little cluster:
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# policy0 = cpus 0-5, 384000..3532800 kHz (6x performance) <- the protocol's "little"
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# policy6 = cpus 6-7, 1017600..4320000 kHz (2x prime) <- the protocol's "big"
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# The campaign's targets (big 1.96 GHz / little 1.55 GHz) are both EXACT members of
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# scaling_available_frequencies here, so no rounding is involved:
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# policy6 avail: ... 1689600 [1958400] 2246400 ...
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# policy0 avail: ... 1363200 [1555200] 1785600 ...
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# Pin method: scaling_min_freq = scaling_max_freq = target, leaving the stock `walt` governor
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# in place. Verified to hold: 30 s under load, zero drift, and the walt governor has no say
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# once min == max. A `performance` governor is offered but is not needed and would have to be
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# restored by name, so the min/max clamp is the lighter touch.
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# Restore: write the stock min/max back (see CPU_*_STOCK_* below). Order matters on policy0 -
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# its stock min (556800) is BELOW its pinned value, so lower the max first, then the min, or
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# the min write is clamped against the still-pinned max.
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CPU_BIG_POLICY=policy6
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CPU_BIG_FREQ=1958400
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CPU_LITTLE_POLICY=policy0
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CPU_LITTLE_FREQ=1555200
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# Stock values sampled 2026-09-07, for the restore path. Governor is `walt` on both policies
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# and is never written, so it needs no restore.
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CPU_BIG_STOCK_MIN=1017600
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CPU_BIG_STOCK_MAX=2841600
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CPU_LITTLE_STOCK_MIN=556800
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CPU_LITTLE_STOCK_MAX=2745600
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# --- GPU -------------------------------------------------------------------------------------
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# Adreno pins through the kgsl pwrlevel knobs, not /proc/gpufreq. 14 pwrlevels, index 0 fastest:
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# [0] 1100 MHz ... [12] 222 MHz [13] 160 MHz
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# Stock range is min_pwrlevel=12 / max_pwrlevel=0, and the devfreq governor (msm-adreno-tz)
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# holds its own max_freq at 1050000000 - i.e. stock DVFS never reaches level 0. Writing
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# echo 0 > /sys/class/kgsl/kgsl-3d0/min_pwrlevel
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# echo 0 > /sys/class/kgsl/kgsl-3d0/max_pwrlevel
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# collapses the range onto level 0 and DOES unlock the 1100 MHz step: gpuclk read 1100000000
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# immediately and for the whole 30 s window. Prefer this over the devfreq min_freq/max_freq
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# pair, which cannot express the top step.
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GPU_PIN_PWRLEVEL=0
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GPU_PIN_KHZ=1100000
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# UNIT TRAP, do not delete: bench.sh reports `gpu_cur_khz` from $GPU_CURFREQ_NODE via
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# `awk '{print $NF}'`. On MediaTek that node yields kHz; kgsl's gpuclk yields Hz. So on this
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# device the field bench.sh calls gpu_cur_khz is actually Hz, and the value to compare it
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# against is GPU_PIN_HZ, not GPU_PIN_KHZ. GPU_PIN_KHZ is carried only to keep the schema
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# identical across profiles.
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GPU_PIN_HZ=1100000000
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GPU_CURFREQ_UNIT=hz
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GPU_STOCK_MIN_PWRLEVEL=12
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GPU_STOCK_MAX_PWRLEVEL=0
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# NOT gpubusy. `cat gpubusy` prints "<busy_cycles> <total_cycles>" and bench.sh takes $1, which
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# would record raw busy cycles as a percentage. gpu_busy_percentage prints "26 %", whose $1 is
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# the percentage bench.sh means.
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GPU_UTIL_NODE=/sys/class/kgsl/kgsl-3d0/gpu_busy_percentage
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GPU_CURFREQ_NODE=/sys/class/kgsl/kgsl-3d0/gpuclk
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# --- Thermal ---------------------------------------------------------------------------------
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# 84 thermal zones; `cpuss-0-0` (thermal_zone13) is the CPU-subsystem sensor for the 6-core
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# cluster that carries most of the load, and was the hottest of the candidates under the load
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# test (47.1 -> 52.1 C while gpuss/quiet_therm stayed near 30 C). Type strings are unique on
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# this device, so bench.sh's match-first-zone-by-type loop resolves it unambiguously.
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# 40 C is reachable at rest: it idles at 34.7 C.
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THERMAL_ZONE_TYPE=cpuss-0-0
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THERMAL_START_MAX_MC=40000
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# Xiaomi has no fan; bench.sh's `settings put global fan_mode 3` is an Odin Lite line and is a
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# harmless no-op here.
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