From 9731dd4cadc53251ef80b3655c8d841fed52fa3d Mon Sep 17 00:00:00 2001 From: Daniel Phillips Date: Mon, 30 May 2022 11:21:22 -0400 Subject: drm/amdkfd: Add available memory ioctl Add a new KFD ioctl to return the largest possible memory size that can be allocated as a buffer object using kfd_ioctl_alloc_memory_of_gpu. It attempts to use exactly the same accept/reject criteria as that function so that allocating a new buffer object of the size returned by this new ioctl is guaranteed to succeed, barring races with other allocating tasks. This IOCTL will be used by libhsakmt: https://www.mail-archive.com/amd-gfx@lists.freedesktop.org/msg75743.html Signed-off-by: Daniel Phillips Signed-off-by: David Yat Sin Reviewed-by: Felix Kuehling Signed-off-by: Alex Deucher --- include/uapi/linux/kfd_ioctl.h | 14 ++++++++++++-- 1 file changed, 12 insertions(+), 2 deletions(-) (limited to 'include/uapi') diff --git a/include/uapi/linux/kfd_ioctl.h b/include/uapi/linux/kfd_ioctl.h index 42975e940758..231eb010b823 100644 --- a/include/uapi/linux/kfd_ioctl.h +++ b/include/uapi/linux/kfd_ioctl.h @@ -34,9 +34,10 @@ * - 1.6 - Query clear flags in SVM get_attr API * - 1.7 - Checkpoint Restore (CRIU) API * - 1.8 - CRIU - Support for SDMA transfers with GTT BOs + * - 1.9 - Add available memory ioctl */ #define KFD_IOCTL_MAJOR_VERSION 1 -#define KFD_IOCTL_MINOR_VERSION 8 +#define KFD_IOCTL_MINOR_VERSION 9 struct kfd_ioctl_get_version_args { __u32 major_version; /* from KFD */ @@ -100,6 +101,12 @@ struct kfd_ioctl_get_queue_wave_state_args { __u32 pad; }; +struct kfd_ioctl_get_available_memory_args { + __u64 available; /* from KFD */ + __u32 gpu_id; /* to KFD */ + __u32 pad; +}; + /* For kfd_ioctl_set_memory_policy_args.default_policy and alternate_policy */ #define KFD_IOC_CACHE_POLICY_COHERENT 0 #define KFD_IOC_CACHE_POLICY_NONCOHERENT 1 @@ -826,7 +833,10 @@ struct kfd_ioctl_set_xnack_mode_args { #define AMDKFD_IOC_CRIU_OP \ AMDKFD_IOWR(0x22, struct kfd_ioctl_criu_args) +#define AMDKFD_IOC_AVAILABLE_MEMORY \ + AMDKFD_IOWR(0x23, struct kfd_ioctl_get_available_memory_args) + #define AMDKFD_COMMAND_START 0x01 -#define AMDKFD_COMMAND_END 0x23 +#define AMDKFD_COMMAND_END 0x24 #endif -- cgit v1.2.3