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drm/amdkfd: Add available memory ioctl

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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 <Daniel.Phillips@amd.com>
Signed-off-by: David Yat Sin <David.YatSin@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Daniel Phillips
2022-05-30 11:21:22 -04:00
committed by Alex Deucher
parent 1a65327a84
commit 9731dd4cad
4 changed files with 81 additions and 6 deletions
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14
include/uapi/linux/kfd_ioctl.h
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@@ -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