Alex
------------------------------------------------------------------------
*From:* amd-gfx <amd-gfx-bounces@xxxxxxxxxxxxxxxxxxxxx> on behalf of
Daniel Phillips <daniel.phillips@xxxxxxx>
*Sent:* Monday, January 10, 2022 3:54 PM
*To:* amd-gfx@xxxxxxxxxxxxxxxxxxxxx <amd-gfx@xxxxxxxxxxxxxxxxxxxxx>;
dri-devel@xxxxxxxxxxxxxxxxxxxxx <dri-devel@xxxxxxxxxxxxxxxxxxxxx>
*Cc:* Phillips, Daniel <Daniel.Phillips@xxxxxxx>
*Subject:* [PATCH 1/1] Add available memory ioctl for libhsakmt
From: Daniel Phillips <dphillip@xxxxxxx>
Add an ioctl to inquire memory available for allocation by libhsakmt
per node, allowing for space consumed by page translation tables.
---
drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h | 1 +
.../gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c | 14 ++++++++++++++
drivers/gpu/drm/amd/amdkfd/kfd_chardev.c | 17 +++++++++++++++++
include/uapi/linux/kfd_ioctl.h | 14 ++++++++++++--
4 files changed, 44 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h
b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h
index fcbc8a9c9e06..64c6c36685d3 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h
@@ -266,6 +266,7 @@ int amdgpu_amdkfd_gpuvm_acquire_process_vm(struct
amdgpu_device *adev,
void amdgpu_amdkfd_gpuvm_release_process_vm(struct amdgpu_device *adev,
void *drm_priv);
uint64_t amdgpu_amdkfd_gpuvm_get_process_page_dir(void *drm_priv);
+size_t amdgpu_amdkfd_get_available_memory(struct amdgpu_device *adev);
int amdgpu_amdkfd_gpuvm_alloc_memory_of_gpu(
struct amdgpu_device *adev, uint64_t va, uint64_t size,
void *drm_priv, struct kgd_mem **mem,
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
index 86a1a6c109d9..b7490a659173 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
@@ -190,6 +190,20 @@ static int amdgpu_amdkfd_reserve_mem_limit(struct
amdgpu_device *adev,
return ret;
}
+size_t amdgpu_amdkfd_get_available_memory(struct amdgpu_device *adev)
+{
+ uint64_t reserved_for_pt =
+ ESTIMATE_PT_SIZE(amdgpu_amdkfd_total_mem_size);
+ size_t available_memory;
+
+ spin_lock(&kfd_mem_limit.mem_limit_lock);
+ available_memory =
+ adev->gmc.real_vram_size -
+ adev->kfd.vram_used - reserved_for_pt;
+ spin_unlock(&kfd_mem_limit.mem_limit_lock);
+ return available_memory;
+}
+
static void unreserve_mem_limit(struct amdgpu_device *adev,
uint64_t size, u32 alloc_flag)
{
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
b/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
index 4bfc0c8ab764..5c2f6d97ff1c 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
@@ -486,6 +486,20 @@ static int kfd_ioctl_get_queue_wave_state(struct
file *filep,
return r;
}
+static int kfd_ioctl_get_available_memory(struct file *filep,
+ struct kfd_process *p, void *data)
+{
+ struct kfd_ioctl_get_available_memory_args *args = data;
+ struct kfd_dev *dev;
+
+ dev = kfd_device_by_id(args->gpu_id);
+ if (!dev)
+ return -EINVAL;
+
+ args->available = amdgpu_amdkfd_get_available_memory(dev->adev);
+ return 0;
+}
+
static int kfd_ioctl_set_memory_policy(struct file *filep,
struct kfd_process *p, void
*data)
{
@@ -1959,6 +1973,9 @@ static const struct amdkfd_ioctl_desc
amdkfd_ioctls[] = {
AMDKFD_IOCTL_DEF(AMDKFD_IOC_SET_XNACK_MODE,
kfd_ioctl_set_xnack_mode, 0),
+
+ AMDKFD_IOCTL_DEF(AMDKFD_IOC_AVAILABLE_MEMORY,
+ kfd_ioctl_get_available_memory, 0),
};
#define AMDKFD_CORE_IOCTL_COUNT ARRAY_SIZE(amdkfd_ioctls)
diff --git a/include/uapi/linux/kfd_ioctl.h
b/include/uapi/linux/kfd_ioctl.h
index af96af174dc4..94a99add2432 100644
--- a/include/uapi/linux/kfd_ioctl.h
+++ b/include/uapi/linux/kfd_ioctl.h
@@ -32,9 +32,10 @@
* - 1.4 - Indicate new SRAM EDC bit in device properties
* - 1.5 - Add SVM API
* - 1.6 - Query clear flags in SVM get_attr API
+ * - 1.7 - Add available_memory ioctl
*/
#define KFD_IOCTL_MAJOR_VERSION 1
-#define KFD_IOCTL_MINOR_VERSION 6
+#define KFD_IOCTL_MINOR_VERSION 7
struct kfd_ioctl_get_version_args {
__u32 major_version; /* from KFD */
@@ -98,6 +99,12 @@ 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
@@ -742,7 +749,10 @@ struct kfd_ioctl_set_xnack_mode_args {
#define AMDKFD_IOC_SET_XNACK_MODE \
AMDKFD_IOWR(0x21, struct kfd_ioctl_set_xnack_mode_args)
+#define AMDKFD_IOC_AVAILABLE_MEMORY \
+ AMDKFD_IOR(0x22, struct
kfd_ioctl_get_available_memory_args)
+
#define AMDKFD_COMMAND_START 0x01
-#define AMDKFD_COMMAND_END 0x22
+#define AMDKFD_COMMAND_END 0x23
#endif
--
2.34.1
