spi_nor_read...p_dma_unsafe(9)

💅 spi_nor_read_sfdp_dma_unsafe(9) 💅

okay so this is the Kernel API Manual page for the long-name queen herself, and she's here to read Serial Flash Discoverable Parameters. bestie, the function name is doing cardio, but the plot is simple. ✨

✨ NAME ✨

spi_nor_read_sfdp_dma_unsafe — read Serial Flash Discoverable Parameters.

🌸 SYNOPSIS 🌸

int spi_nor_read_sfdp_dma_unsafe (struct spi_nor *nor , u32 addr , size_t len , void *buf );

🎀 ARGUMENTS 🎀

• nor — pointer to a struct spi_nor.
• addr — offset in the SFDP area to start reading data from.
• len — number of bytes to read.
• buf — buffer where the SFDP data are copied into.

🦋 DESCRIPTION 🦋

so the move here is: this wraps spi_nor_read_sfdp using a kmalloc'ed bounce buffer, because buf is now not guaranteed to be dma-safe. that's the whole vibe. 🫶

💜 RETURN 💜

• -ENOMEM if kmalloc fails.
• the return code of spi_nor_read_sfdp otherwise.

🔥 SEE ALSO 🔥

Kernel file: ./drivers/mtd/spi-nor/sfdp.c

• spi_nor_read_raw(9)
• spi_nor_read_sfdp(9)
• spi_nor_set_erase_settings_from_bfpt(9)
• spi_nor_map_cmp_erase_type(9)
• spi_nor_sort_erase_mask(9)
• spi_nor_regions_sort_erase_types(9)
• spi_nor_parse_bfpt(9)
• spi_nor_smpt_addr_nbytes(9)
• spi_nor_smpt_read_dummy(9)
• spi_nor_get_map_in_use(9)
• spi_nor_region_check_overlay(9)
• spi_nor_init_non_uniform_erase_map(9)
• spi_nor_parse_smpt(9)
• spi_nor_parse_4bait(9)
• spi_nor_parse_profile1(9)
• spi_nor_parse_sccr(9)
• spi_nor_parse_sccr_mc(9)
• spi_nor_post_sfdp_fixups(9)
• spi_nor_check_sfdp_signature(9)
• spi_nor_parse_sfdp(9)

okay bestie, that's the whole page 💖 — source/version: ./drivers/mtd/spi-nor, dated October 2026, and the manual page is spi_nor_read...p_dma_unsafe(9). slay. 💅