STRUCT FSL_MC_IO(9)

🌸 struct fsl_mc_io(9) — the MC I/O bestie struct

okay so this page is from the Kernel API Manual, and it's all about the MC I/O object you pass into mc_send_command(). literally the little struct bestie that makes command calls happen. 💅

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✨ NAME ✨

struct fsl_mc_io — MC I/O object to be passed-in to mc_send_command() 🫶

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🎀 SYNOPSIS 🎀

       struct fsl_mc_io {
           struct device *dev;
           u16 flags;
           u32 portal_size;
           phys_addr_t portal_phys_addr;
           void __iomem *portal_virt_addr;
           struct fsl_mc_device *dpmcp_dev;
           union {
             struct mutex mutex;
             raw_spinlock_t spinlock;
           };
        };

no cap, that's the whole struct layout. 🌟

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💅 Members 💅

• dev — device associated with this Mc I/O object.
• flags — flags for mc_send_command.
• portal_size — MC command portal size in bytes.
• portal_phys_addr — MC command portal physical address.
• portal_virt_addr — MC command portal virtual address.
• dpmcp_dev — pointer to the DPMCP device associated with the MC portal.
• {unnamed_union} — anonymous.
• mutex — Mutex to serialize mc_send_command calls that use the same MC portal, if the fsl_mc_io object was created with the FSL_MC_IO_ATOMIC_CONTEXT_PORTAL flag off. mc_send_command calls for this fsl_mc_io object must be made only from non-atomic context.
• spinlock — Spinlock to serialize mc_send_command calls that use the same MC portal, if the fsl_mc_io object was created with the FSL_MC_IO_ATOMIC_CONTEXT_PORTAL flag on. mc_send_command calls for this fsl_mc_io object can be made from atomic or non-atomic context.

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💜 Description 💜

bestie, the original page has these two lines back-to-back, colons and all, with no extra list items after them:

• Fields are only meaningful if the FSL_MC_IO_ATOMIC_CONTEXT_PORTAL flag is not set:
• Fields are only meaningful if the FSL_MC_IO_ATOMIC_CONTEXT_PORTAL flag is set:

yes, both are literally there. iconic formatting choices, honestly. 😭

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🦋 SEE ALSO 🦋

• Kernel file ./include/linux/fsl/mc.h
• struct fsl_mc_driver(9)
• enum fsl_mc_pool_type(9)
• struct fsl_mc_resource(9)
• struct fsl_mc_device_irq(9)
• struct fsl_mc_obj_desc(9)
• struct fsl_mc_device(9)
• struct fsl_mc_version(9)
• struct dpbp_attr(9)
• struct dpcon_attr(9)
• struct dpcon_notification_cfg(9)

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🫶 that's the wrap, bestie — source/version vibes: ./include/linux/fsl, dated October 2026. 💖