fsl_upm_run_pattern(9)

💅 fsl_upm_run_pattern — the girlies in the Kernel API Manual said it's my turn to run a pattern

okay so bestie, real talk — we're in the Kernel API Manual section 9 today, and the star of the show is fsl_upm_run_pattern. yes it's a mouthful, no I will not be pronouncing it out loud, but it's giving powerpc realness and honestly? obsessed. 🦋

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✨ NAME ✨

fsl_upm_run_pattern — literally just actually running an UPM pattern. that's it. that's the whole vibe. no cap. 💅

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🌸 SYNOPSIS 🌸

int fsl_upm_run_pattern (struct fsl_upm *upm , void __iomem *io_base ,
u32 mar );

look at her. three little arguments. main character energy fr fr. 🎀

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🧚 ARGUMENTS 🧚

• upm — a pointer to the struct fsl_upm you already got your hands on via fsl_upm_find. like, you can't just have one, you have to go get it first, iykyk.
• io_base — the remapped pointer to exactly where the memory access should happen. this is the spot. the location. the moment. 📍
• mar — the MAR register content during pattern execution. yes it's a whole thing, keep reading.

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💖 DESCRIPTION 💖

so what does she do? this function triggers a dummy write to the memory specified by io_base, and the way that works is that the UPM pattern actually gets executed. like, the pattern is real now. it's happening. not a drill. 🔥

⚠️ bestie pls note: how mar gets used depends on the pre-programmed AMX bits in the UPM RAM. so it's not a one-size-fits-all situation, it's giving situationship with your hardware config. don't come for me if you skipped that part. 🙈

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👑 SEE ALSO 👑

• Kernel file ./arch/powerpc/sysdev/fsl_lbc.c
• fsl_lbc_addr(9)
• fsl_lbc_find(9)
• fsl_upm_find(9)

go read those too, bestie, it's called ✨*enrichment*✨ 🌈

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okay that's the whole page, mwah 💋 — brought to you by ./arch/powerpc/sysdev, dated October 2026, straight out of the Kernel API Manual. slay, stay safe, and remember to fsl_upm_find before you fsl_upm_run_pattern. periodt. 🫶💜