msm_perfcntr_counter_base(9)

💅 msm_perfcntr_counter_base(9) ✨

okay so bestie, welcome to the Kernel API Manual 🎀 — today's main character is msm_perfcntr_counter_base, and honestly? she's lowkey iconic.

---

🌸 NAME 🌸

msm_perfcntr_counter_base — get idx of the first counter in group 🫶

---

⭐ SYNOPSIS ⭐

uint32_t msm_perfcntr_counter_base (const struct msm_perfcntr_stream
*stream , uint32_t group_idx );

like literally that's the whole vibe check. two args, one uint32_t coming back at you 💖

---

🦋 ARGUMENTS 🦋

• stream — the global perfcntr stream 🌈 (the big one, the main character)
• group_idx — the index of the counter group 🔢 (which group we're talking about, bestie)

---

✨ DESCRIPTION ✨

okay so here's the tea ☕: for global counter collection, the counters get allocated from the end (last counter) 🍓 — meanwhile UMD allocates them from the start (0..N-1) 💅.

the way that matters: since UMD always allocated them from the start, this also minimizes the chance of conflict when you're using an old UMD which predates the PERFCNTR_CONFIG ioctl 👑. no cap, that's the whole reason.

and what does she return? the index of the first counter to use 🔥. it's an index into msm_perfcntr_group::counters[] — remember that, it's important fr fr.

ngl, the return value is the moment. index of first counter to use. periodt. 💀

---

🌈 SEE ALSO 🌈

• the kernel file literally sitting at ./drivers/gpu/drm/msm/msm_perfcntr.c 🧚
• msm_perfcntr_group_idx(9) — her bestie, go say hi 💜

---

and that's the page, bestie 🎀💖 — brought to you from ./drivers/gpu/drm/msm, all the way from October 2026. slay, see you in the next manpage ✨🫶