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#ifndef GSP_PHYS_GPU_H
#define GSP_PHYS_GPU_H
#include <linux/types.h>
/*
* Physical GPU ownership (real-GSP execution backend, bring-up rung 1).
* Claim is disabled unless the gsp_phys_gpu module parameter is set.
*/
bool gsp_phys_gpu_claimed(void);
int gsp_phys_gpu_claim(void);
void gsp_phys_gpu_release(void);
void __iomem *gsp_phys_gpu_bar0(void);
/*
* Backend session state (P0 skeleton; one physical GPU, one live claim).
* OFF until a start claims the device; READY is the only state in which live
* RPC forwarding is legal. The refcount and owner flag decide who releases:
* the load-time module-owned claim is joined, never released, by a stop().
*/
enum gsp_phys_backend_state {
GSP_PHYS_BACKEND_OFF = 0,
GSP_PHYS_BACKEND_CLAIMING,
GSP_PHYS_BACKEND_BOOTING,
GSP_PHYS_BACKEND_READY,
GSP_PHYS_BACKEND_STOPPING,
};
/*
* Refcounted session start/stop around gsp_phys_gpu_claim()/_release(); safe
* (and idempotent) in any state. The generation counter is bumped when the
* session leaves READY; a forward that captured the previous value re-checks
* it under gsp_phys_rm_lock and refuses, so a stop cannot race an in-flight
* forward. The lock itself stays private to gsp_phys_gpu.c; the state and
* generation accessors are lock-free reads for use from the RPC path.
*/
int gsp_phys_backend_start(void);
void gsp_phys_backend_stop(void);
int gsp_phys_backend_state(void);
u32 gsp_phys_backend_generation(void);
#endif /* GSP_PHYS_GPU_H */
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