[PATCH 1/1] drm/amdkfd: Add IPC API
Felix Kuehling
Felix.Kuehling at amd.com
Tue Jul 14 03:14:35 UTC 2020
This allows exporting and importing buffers. The API generates handles
that can be used with the HIP IPC API, i.e. big numbers rather than
file descriptors.
Signed-off-by: Felix Kuehling <Felix.Kuehling at amd.com>
---
drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h | 5 +
.../gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c | 56 +++-
drivers/gpu/drm/amd/amdkfd/Makefile | 3 +-
drivers/gpu/drm/amd/amdkfd/kfd_chardev.c | 74 ++---
drivers/gpu/drm/amd/amdkfd/kfd_ipc.c | 263 ++++++++++++++++++
drivers/gpu/drm/amd/amdkfd/kfd_ipc.h | 55 ++++
drivers/gpu/drm/amd/amdkfd/kfd_module.c | 5 +
drivers/gpu/drm/amd/amdkfd/kfd_priv.h | 5 +
include/uapi/linux/kfd_ioctl.h | 62 ++++-
9 files changed, 488 insertions(+), 40 deletions(-)
create mode 100644 drivers/gpu/drm/amd/amdkfd/kfd_ipc.c
create mode 100644 drivers/gpu/drm/amd/amdkfd/kfd_ipc.h
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h
index 3f2b695cf19e..0f8dc4c4f924 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h
@@ -49,6 +49,7 @@ struct kfd_bo_va_list {
struct kgd_mem {
struct mutex lock;
struct amdgpu_bo *bo;
+ struct kfd_ipc_obj *ipc_obj;
struct list_head bo_va_list;
/* protected by amdkfd_process_info.lock */
struct ttm_validate_buffer validate_list;
@@ -240,9 +241,13 @@ int amdgpu_amdkfd_gpuvm_get_vm_fault_info(struct kgd_dev *kgd,
int amdgpu_amdkfd_gpuvm_import_dmabuf(struct kgd_dev *kgd,
struct dma_buf *dmabuf,
+ struct kfd_ipc_obj *ipc_obj,
uint64_t va, void *vm,
struct kgd_mem **mem, uint64_t *size,
uint64_t *mmap_offset);
+int amdgpu_amdkfd_gpuvm_export_ipc_obj(struct kgd_dev *kgd, void *vm,
+ struct kgd_mem *mem,
+ struct kfd_ipc_obj **ipc_obj);
void amdgpu_amdkfd_gpuvm_init_mem_limits(void);
void amdgpu_amdkfd_unreserve_memory_limit(struct amdgpu_bo *bo);
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
index c408936e8f98..cd5f23c0c2ca 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
@@ -29,6 +29,7 @@
#include "amdgpu_vm.h"
#include "amdgpu_amdkfd.h"
#include "amdgpu_dma_buf.h"
+#include "kfd_ipc.h"
#include <uapi/linux/kfd_ioctl.h>
/* BO flag to indicate a KFD userptr BO */
@@ -1353,6 +1354,9 @@ int amdgpu_amdkfd_gpuvm_free_memory_of_gpu(
*size = 0;
}
+ /* Unreference the ipc_obj if applicable */
+ kfd_ipc_obj_put(&mem->ipc_obj);
+
/* Free the BO*/
drm_gem_object_put_unlocked(&mem->bo->tbo.base);
mutex_destroy(&mem->lock);
@@ -1656,6 +1660,7 @@ int amdgpu_amdkfd_gpuvm_get_vm_fault_info(struct kgd_dev *kgd,
int amdgpu_amdkfd_gpuvm_import_dmabuf(struct kgd_dev *kgd,
struct dma_buf *dma_buf,
+ struct kfd_ipc_obj *ipc_obj,
uint64_t va, void *vm,
struct kgd_mem **mem, uint64_t *size,
uint64_t *mmap_offset)
@@ -1692,15 +1697,18 @@ int amdgpu_amdkfd_gpuvm_import_dmabuf(struct kgd_dev *kgd,
INIT_LIST_HEAD(&(*mem)->bo_va_list);
mutex_init(&(*mem)->lock);
-
- (*mem)->alloc_flags =
- ((bo->preferred_domains & AMDGPU_GEM_DOMAIN_VRAM) ?
- KFD_IOC_ALLOC_MEM_FLAGS_VRAM : KFD_IOC_ALLOC_MEM_FLAGS_GTT)
- | KFD_IOC_ALLOC_MEM_FLAGS_WRITABLE
- | KFD_IOC_ALLOC_MEM_FLAGS_EXECUTABLE;
+ if (bo->kfd_bo)
+ (*mem)->alloc_flags = bo->kfd_bo->alloc_flags;
+ else
+ (*mem)->alloc_flags =
+ ((bo->preferred_domains & AMDGPU_GEM_DOMAIN_VRAM) ?
+ KFD_IOC_ALLOC_MEM_FLAGS_VRAM : KFD_IOC_ALLOC_MEM_FLAGS_GTT)
+ | KFD_IOC_ALLOC_MEM_FLAGS_WRITABLE
+ | KFD_IOC_ALLOC_MEM_FLAGS_EXECUTABLE;
drm_gem_object_get(&bo->tbo.base);
(*mem)->bo = bo;
+ (*mem)->ipc_obj = ipc_obj;
(*mem)->va = va;
(*mem)->domain = (bo->preferred_domains & AMDGPU_GEM_DOMAIN_VRAM) ?
AMDGPU_GEM_DOMAIN_VRAM : AMDGPU_GEM_DOMAIN_GTT;
@@ -1713,6 +1721,42 @@ int amdgpu_amdkfd_gpuvm_import_dmabuf(struct kgd_dev *kgd,
return 0;
}
+int amdgpu_amdkfd_gpuvm_export_ipc_obj(struct kgd_dev *kgd, void *vm,
+ struct kgd_mem *mem,
+ struct kfd_ipc_obj **ipc_obj)
+{
+ struct amdgpu_device *adev = NULL;
+ struct dma_buf *dmabuf;
+ int r = 0;
+
+ if (!kgd || !vm || !mem)
+ return -EINVAL;
+
+ adev = get_amdgpu_device(kgd);
+ mutex_lock(&mem->lock);
+
+ if (mem->ipc_obj) {
+ *ipc_obj = mem->ipc_obj;
+ goto unlock_out;
+ }
+
+ dmabuf = amdgpu_gem_prime_export(&mem->bo->tbo.base, 0);
+ if (IS_ERR(dmabuf)) {
+ r = PTR_ERR(dmabuf);
+ goto unlock_out;
+ }
+
+ r = kfd_ipc_store_insert(dmabuf, &mem->ipc_obj);
+ if (r)
+ dma_buf_put(dmabuf);
+ else
+ *ipc_obj = mem->ipc_obj;
+
+unlock_out:
+ mutex_unlock(&mem->lock);
+ return r;
+}
+
/* Evict a userptr BO by stopping the queues if necessary
*
* Runs in MMU notifier, may be in RECLAIM_FS context. This means it
diff --git a/drivers/gpu/drm/amd/amdkfd/Makefile b/drivers/gpu/drm/amd/amdkfd/Makefile
index e1e4115dcf78..815d9a9e7a3c 100644
--- a/drivers/gpu/drm/amd/amdkfd/Makefile
+++ b/drivers/gpu/drm/amd/amdkfd/Makefile
@@ -54,7 +54,8 @@ AMDKFD_FILES := $(AMDKFD_PATH)/kfd_module.o \
$(AMDKFD_PATH)/kfd_dbgdev.o \
$(AMDKFD_PATH)/kfd_dbgmgr.o \
$(AMDKFD_PATH)/kfd_smi_events.o \
- $(AMDKFD_PATH)/kfd_crat.o
+ $(AMDKFD_PATH)/kfd_crat.o \
+ $(AMDKFD_PATH)/kfd_ipc.o
ifneq ($(CONFIG_AMD_IOMMU_V2),)
AMDKFD_FILES += $(AMDKFD_PATH)/kfd_iommu.o
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c b/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
index e9b96ad3d9a5..e7d15fa02b5e 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
@@ -38,6 +38,7 @@
#include "kfd_priv.h"
#include "kfd_device_queue_manager.h"
#include "kfd_dbgmgr.h"
+#include "kfd_ipc.h"
#include "amdgpu_amdkfd.h"
#include "kfd_smi_events.h"
@@ -1691,53 +1692,58 @@ static int kfd_ioctl_import_dmabuf(struct file *filep,
struct kfd_process *p, void *data)
{
struct kfd_ioctl_import_dmabuf_args *args = data;
- struct kfd_process_device *pdd;
- struct dma_buf *dmabuf;
struct kfd_dev *dev;
- int idr_handle;
- uint64_t size;
- void *mem;
int r;
dev = kfd_device_by_id(args->gpu_id);
if (!dev)
return -EINVAL;
- dmabuf = dma_buf_get(args->dmabuf_fd);
- if (IS_ERR(dmabuf))
- return PTR_ERR(dmabuf);
+ r = kfd_ipc_import_dmabuf(dev, p, args->dmabuf_fd,
+ args->va_addr, &args->handle, NULL);
+ if (r)
+ pr_err("Failed to import dmabuf\n");
- mutex_lock(&p->mutex);
+ return r;
+}
- pdd = kfd_bind_process_to_device(dev, p);
- if (IS_ERR(pdd)) {
- r = PTR_ERR(pdd);
- goto err_unlock;
- }
+static int kfd_ioctl_ipc_export_handle(struct file *filep,
+ struct kfd_process *p,
+ void *data)
+{
+ struct kfd_ioctl_ipc_export_handle_args *args = data;
+ struct kfd_dev *dev;
+ int r;
+
+ dev = kfd_device_by_id(args->gpu_id);
+ if (!dev)
+ return -EINVAL;
- r = amdgpu_amdkfd_gpuvm_import_dmabuf(dev->kgd, dmabuf,
- args->va_addr, pdd->vm,
- (struct kgd_mem **)&mem, &size,
- NULL);
+ r = kfd_ipc_export_as_handle(dev, p, args->handle, args->share_handle);
if (r)
- goto err_unlock;
+ pr_err("Failed to export IPC handle\n");
- idr_handle = kfd_process_device_create_obj_handle(pdd, mem);
- if (idr_handle < 0) {
- r = -EFAULT;
- goto err_free;
- }
+ return r;
+}
- mutex_unlock(&p->mutex);
+static int kfd_ioctl_ipc_import_handle(struct file *filep,
+ struct kfd_process *p,
+ void *data)
+{
+ struct kfd_ioctl_ipc_import_handle_args *args = data;
+ struct kfd_dev *dev = NULL;
+ int r;
- args->handle = MAKE_HANDLE(args->gpu_id, idr_handle);
+ dev = kfd_device_by_id(args->gpu_id);
+ if (!dev)
+ return -EINVAL;
- return 0;
+ r = kfd_ipc_import_handle(p, args->share_handle, args->va_addr,
+ &args->handle, &args->gpu_id,
+ &args->mmap_offset);
+ if (r)
+ pr_err("Failed to import IPC handle\n");
-err_free:
- amdgpu_amdkfd_gpuvm_free_memory_of_gpu(dev->kgd, (struct kgd_mem *)mem, NULL);
-err_unlock:
- mutex_unlock(&p->mutex);
return r;
}
@@ -1853,6 +1859,12 @@ static const struct amdkfd_ioctl_desc amdkfd_ioctls[] = {
AMDKFD_IOCTL_DEF(AMDKFD_IOC_SMI_EVENTS,
kfd_ioctl_smi_events, 0),
+
+ AMDKFD_IOCTL_DEF(AMDKFD_IOC_IPC_IMPORT_HANDLE,
+ kfd_ioctl_ipc_import_handle, 0),
+
+ AMDKFD_IOCTL_DEF(AMDKFD_IOC_IPC_EXPORT_HANDLE,
+ kfd_ioctl_ipc_export_handle, 0),
};
#define AMDKFD_CORE_IOCTL_COUNT ARRAY_SIZE(amdkfd_ioctls)
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_ipc.c b/drivers/gpu/drm/amd/amdkfd/kfd_ipc.c
new file mode 100644
index 000000000000..3de8d7826f07
--- /dev/null
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_ipc.c
@@ -0,0 +1,263 @@
+/*
+ * Copyright 2014 Advanced Micro Devices, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include <linux/slab.h>
+#include <linux/random.h>
+
+#include "kfd_ipc.h"
+#include "kfd_priv.h"
+#include "amdgpu_amdkfd.h"
+
+#define KFD_IPC_HASH_TABLE_SIZE_SHIFT 4
+#define KFD_IPC_HASH_TABLE_SIZE_MASK ((1 << KFD_IPC_HASH_TABLE_SIZE_SHIFT) - 1)
+
+static struct kfd_ipc_handles {
+ DECLARE_HASHTABLE(handles, KFD_IPC_HASH_TABLE_SIZE_SHIFT);
+ struct mutex lock;
+} kfd_ipc_handles;
+
+/* Since, handles are random numbers, it can be used directly as hashing key.
+ * The least 4 bits of the handle are used as key. However, during import all
+ * 128 bits of the handle are checked to prevent handle snooping.
+ */
+#define HANDLE_TO_KEY(sh) ((*(uint64_t *)sh) & KFD_IPC_HASH_TABLE_SIZE_MASK)
+
+int kfd_ipc_store_insert(struct dma_buf *dmabuf, struct kfd_ipc_obj **ipc_obj)
+{
+ struct kfd_ipc_obj *obj;
+
+ obj = kmalloc(sizeof(*obj), GFP_KERNEL);
+ if (!obj)
+ return -ENOMEM;
+
+ /* The initial ref belongs to the allocator process.
+ * The IPC object store itself does not hold a ref since
+ * there is no specific moment in time where that ref should
+ * be dropped, except "when there are no more userspace processes
+ * holding a ref to the object". Therefore the removal from IPC
+ * storage happens at ipc_obj release time.
+ */
+ kref_init(&obj->ref);
+ obj->dmabuf = dmabuf;
+ get_random_bytes(obj->share_handle, sizeof(obj->share_handle));
+
+ mutex_lock(&kfd_ipc_handles.lock);
+ hlist_add_head(&obj->node,
+ &kfd_ipc_handles.handles[HANDLE_TO_KEY(obj->share_handle)]);
+ mutex_unlock(&kfd_ipc_handles.lock);
+
+ if (ipc_obj)
+ *ipc_obj = obj;
+
+ return 0;
+}
+
+static void ipc_obj_release(struct kref *r)
+{
+ struct kfd_ipc_obj *obj;
+
+ obj = container_of(r, struct kfd_ipc_obj, ref);
+
+ mutex_lock(&kfd_ipc_handles.lock);
+ hash_del(&obj->node);
+ mutex_unlock(&kfd_ipc_handles.lock);
+
+ dma_buf_put(obj->dmabuf);
+ kfree(obj);
+}
+
+static struct kfd_ipc_obj *ipc_obj_get(struct kfd_ipc_obj *obj)
+{
+ if (kref_get_unless_zero(&obj->ref))
+ return obj;
+ return NULL;
+}
+
+void kfd_ipc_obj_put(struct kfd_ipc_obj **obj)
+{
+ if (*obj) {
+ kref_put(&(*obj)->ref, ipc_obj_release);
+ *obj = NULL;
+ }
+}
+
+int kfd_ipc_init(void)
+{
+ mutex_init(&kfd_ipc_handles.lock);
+ hash_init(kfd_ipc_handles.handles);
+ return 0;
+}
+
+static int kfd_import_dmabuf_create_kfd_bo(struct kfd_dev *dev,
+ struct kfd_process *p,
+ struct dma_buf *dmabuf,
+ struct kfd_ipc_obj *ipc_obj,
+ uint64_t va_addr, uint64_t *handle,
+ uint64_t *mmap_offset)
+{
+ int r;
+ void *mem;
+ uint64_t size;
+ int idr_handle;
+ struct kfd_process_device *pdd = NULL;
+
+ if (!handle)
+ return -EINVAL;
+
+ if (!dev)
+ return -EINVAL;
+
+ mutex_lock(&p->mutex);
+
+ pdd = kfd_bind_process_to_device(dev, p);
+ if (IS_ERR(pdd)) {
+ r = PTR_ERR(pdd);
+ goto err_unlock;
+ }
+
+ r = amdgpu_amdkfd_gpuvm_import_dmabuf(dev->kgd, dmabuf, ipc_obj,
+ va_addr, pdd->vm,
+ (struct kgd_mem **)&mem, &size,
+ mmap_offset);
+ if (r)
+ goto err_unlock;
+
+ idr_handle = kfd_process_device_create_obj_handle(pdd, mem);
+ if (idr_handle < 0) {
+ r = -EFAULT;
+ goto err_free;
+ }
+
+ mutex_unlock(&p->mutex);
+
+ *handle = MAKE_HANDLE(dev->id, idr_handle);
+
+ return 0;
+
+err_free:
+ amdgpu_amdkfd_gpuvm_free_memory_of_gpu(dev->kgd, (struct kgd_mem *)mem,
+ NULL);
+err_unlock:
+ mutex_unlock(&p->mutex);
+ return r;
+}
+
+int kfd_ipc_import_dmabuf(struct kfd_dev *dev, struct kfd_process *p,
+ int dmabuf_fd, uint64_t va_addr,
+ uint64_t *handle, uint64_t *mmap_offset)
+{
+ int r;
+ struct dma_buf *dmabuf = dma_buf_get(dmabuf_fd);
+
+ if (!dmabuf)
+ return -EINVAL;
+
+ r = kfd_import_dmabuf_create_kfd_bo(dev, p, dmabuf, NULL,
+ va_addr, handle, mmap_offset);
+ dma_buf_put(dmabuf);
+ return r;
+}
+
+int kfd_ipc_import_handle(struct kfd_process *p,
+ uint32_t *share_handle, uint64_t va_addr,
+ uint64_t *handle, uint32_t *gpu_id,
+ uint64_t *mmap_offset)
+{
+ struct kfd_dev *dev;
+ int r;
+ struct kfd_ipc_obj *entry, *found = NULL;
+
+ mutex_lock(&kfd_ipc_handles.lock);
+ /* Convert the user provided handle to hash key and search only in that
+ * bucket
+ */
+ hlist_for_each_entry(entry,
+ &kfd_ipc_handles.handles[HANDLE_TO_KEY(share_handle)], node) {
+ if (!memcmp(entry->share_handle, share_handle,
+ sizeof(entry->share_handle))) {
+ found = ipc_obj_get(entry);
+ break;
+ }
+ }
+ mutex_unlock(&kfd_ipc_handles.lock);
+
+ if (!found)
+ return -EINVAL;
+
+ pr_debug("Found ipc_dma_buf: %p\n", found->dmabuf);
+
+ dev = kfd_device_by_id(found->gpu_id);
+ if (!dev)
+ return -ENODEV;
+
+ r = kfd_import_dmabuf_create_kfd_bo(dev, p, found->dmabuf, found,
+ va_addr, handle, mmap_offset);
+ if (r)
+ goto error_unref;
+
+ *gpu_id = found->gpu_id;
+
+ return r;
+
+error_unref:
+ kfd_ipc_obj_put(&found);
+ return r;
+}
+
+int kfd_ipc_export_as_handle(struct kfd_dev *dev, struct kfd_process *p,
+ uint64_t handle, uint32_t *ipc_handle)
+{
+ struct kfd_process_device *pdd = NULL;
+ struct kfd_ipc_obj *ipc_obj;
+ struct kgd_mem *mem;
+ int r;
+
+ if (!dev || !ipc_handle)
+ return -EINVAL;
+
+ mutex_lock(&p->mutex);
+ pdd = kfd_bind_process_to_device(dev, p);
+ if (IS_ERR(pdd)) {
+ mutex_unlock(&p->mutex);
+ pr_err("Failed to get pdd\n");
+ return PTR_ERR(pdd);
+ }
+
+ mem = kfd_process_device_translate_handle(pdd, GET_IDR_HANDLE(handle));
+ mutex_unlock(&p->mutex);
+
+ if (!mem) {
+ pr_err("Failed to get bo");
+ return -EINVAL;
+ }
+
+ r = amdgpu_amdkfd_gpuvm_export_ipc_obj(dev->kgd, pdd->vm, mem,
+ &ipc_obj);
+ if (r)
+ return r;
+
+ ipc_obj->gpu_id = dev->id;
+ memcpy(ipc_handle, ipc_obj->share_handle,
+ sizeof(ipc_obj->share_handle));
+
+ return r;
+}
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_ipc.h b/drivers/gpu/drm/amd/amdkfd/kfd_ipc.h
new file mode 100644
index 000000000000..9450a667918e
--- /dev/null
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_ipc.h
@@ -0,0 +1,55 @@
+/*
+ * Copyright 2014 Advanced Micro Devices, Inc.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ *
+ */
+
+#ifndef KFD_IPC_H_
+#define KFD_IPC_H_
+
+#include <linux/types.h>
+#include <linux/dma-buf.h>
+
+/* avoid including kfd_priv.h */
+struct kfd_dev;
+struct kfd_process;
+
+struct kfd_ipc_obj {
+ struct hlist_node node;
+ struct kref ref;
+ struct dma_buf *dmabuf;
+ uint32_t share_handle[4];
+ uint32_t gpu_id;
+};
+
+int kfd_ipc_import_handle(struct kfd_process *p,
+ uint32_t *share_handle, uint64_t va_addr,
+ uint64_t *handle, uint32_t *gpu_id,
+ uint64_t *mmap_offset);
+int kfd_ipc_import_dmabuf(struct kfd_dev *kfd, struct kfd_process *p,
+ int dmabuf_fd, uint64_t va_addr,
+ uint64_t *handle, uint64_t *mmap_offset);
+int kfd_ipc_export_as_handle(struct kfd_dev *dev, struct kfd_process *p,
+ uint64_t handle, uint32_t *ipc_handle);
+
+int kfd_ipc_store_insert(struct dma_buf *dmabuf, struct kfd_ipc_obj **ipc_obj);
+void kfd_ipc_obj_put(struct kfd_ipc_obj **obj);
+
+#endif /* KFD_IPC_H_ */
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_module.c b/drivers/gpu/drm/amd/amdkfd/kfd_module.c
index f4b7f7e6c40e..0946d5692692 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_module.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_module.c
@@ -52,6 +52,10 @@ static int kfd_init(void)
if (err < 0)
goto err_topology;
+ err = kfd_ipc_init();
+ if (err < 0)
+ goto err_ipc;
+
err = kfd_process_create_wq();
if (err < 0)
goto err_create_wq;
@@ -66,6 +70,7 @@ static int kfd_init(void)
return 0;
err_create_wq:
+err_ipc:
kfd_topology_shutdown();
err_topology:
kfd_chardev_exit();
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_priv.h b/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
index 51ba2020732e..1588b2b45a32 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
@@ -321,6 +321,8 @@ struct kfd_dev {
spinlock_t smi_lock;
};
+struct kfd_ipc_obj;
+
enum kfd_mempool {
KFD_MEMPOOL_SYSTEM_CACHEABLE = 1,
KFD_MEMPOOL_SYSTEM_WRITECOMBINE = 2,
@@ -1087,6 +1089,9 @@ int dbgdev_wave_reset_wavefronts(struct kfd_dev *dev, struct kfd_process *p);
bool kfd_is_locked(void);
+/* IPC Support */
+int kfd_ipc_init(void);
+
/* Compute profile */
void kfd_inc_compute_active(struct kfd_dev *dev);
void kfd_dec_compute_active(struct kfd_dev *dev);
diff --git a/include/uapi/linux/kfd_ioctl.h b/include/uapi/linux/kfd_ioctl.h
index f738c3b53f4e..90ff334e2b5b 100644
--- a/include/uapi/linux/kfd_ioctl.h
+++ b/include/uapi/linux/kfd_ioctl.h
@@ -29,9 +29,10 @@
/*
* - 1.1 - initial version
* - 1.3 - Add SMI events support
+ * - 1.4 - Add IPC export/import
*/
#define KFD_IOCTL_MAJOR_VERSION 1
-#define KFD_IOCTL_MINOR_VERSION 3
+#define KFD_IOCTL_MINOR_VERSION 4
struct kfd_ioctl_get_version_args {
__u32 major_version; /* from KFD */
@@ -464,6 +465,57 @@ enum kfd_mmio_remap {
KFD_MMIO_REMAP_HDP_REG_FLUSH_CNTL = 4,
};
+/* Export IPC handle
+ *
+ * @handle[in]: buffer handle of the BO to export
+ * @gpu_id[in]: GPU ID where @handle was allocated
+ * @share_handle[out]: share handle that can be used with
+ * @kfd_ioctl_ipc_import_handle_args
+ *
+ * @share_handle is a 128 bit random number generated with
+ * @get_random_bytes. This number should be very hard to guess.
+ * Knowledge of the @share_handle implies authorization to access
+ * the shared memory. User mode should treat it like a secret key.
+ * It can be used to import this BO in a different process context
+ * for IPC buffer sharing. The handle will be valid as long as the
+ * underlying BO exists. If the same BO is exported multiple times,
+ * the same handle will be returned.
+ *
+ * Return 0 on success, negative errno on errors.
+ */
+struct kfd_ioctl_ipc_export_handle_args {
+ __u64 handle; /* to KFD */
+ __u32 share_handle[4]; /* from KFD */
+ __u32 gpu_id; /* to KFD */
+ __u32 pad;
+};
+
+/* Import IPC handle
+ *
+ * @share_handle[in]: share handle from @kfd_ioctl_ipc_export_handle_args
+ * @va_addr[in]: virtual address at which to import the BO
+ * @handle[out]: buffer handle of the imported BO
+ * @gpu_id[out]: device in which the shared BO was created
+ * @mmap_offset[out]: mmap offset for CPU-mapping the BO
+ *
+ * @handle represents a new reference to the shared BO. This reference
+ * must be released with kfd_ioctl_free_memory_of_gpu_args.
+ *
+ * The BO can be mapped for GPU access with @kfd_ioctl_map_memory_to_gpu_args.
+ *
+ * It can be mapped for CPU access using the @mmap_offset.
+ *
+ * Return 0 on success, negative errno on errors.
+ */
+struct kfd_ioctl_ipc_import_handle_args {
+ __u64 handle; /* from KFD */
+ __u64 va_addr; /* to KFD */
+ __u64 mmap_offset; /* from KFD */
+ __u32 share_handle[4]; /* to KFD */
+ __u32 gpu_id; /* from KFD */
+ __u32 pad;
+};
+
#define AMDKFD_IOCTL_BASE 'K'
#define AMDKFD_IO(nr) _IO(AMDKFD_IOCTL_BASE, nr)
#define AMDKFD_IOR(nr, type) _IOR(AMDKFD_IOCTL_BASE, nr, type)
@@ -564,7 +616,13 @@ enum kfd_mmio_remap {
#define AMDKFD_IOC_SMI_EVENTS \
AMDKFD_IOWR(0x1F, struct kfd_ioctl_smi_events_args)
+#define AMDKFD_IOC_IPC_IMPORT_HANDLE \
+ AMDKFD_IOWR(0x20, struct kfd_ioctl_ipc_import_handle_args)
+
+#define AMDKFD_IOC_IPC_EXPORT_HANDLE \
+ AMDKFD_IOWR(0x21, struct kfd_ioctl_ipc_export_handle_args)
+
#define AMDKFD_COMMAND_START 0x01
-#define AMDKFD_COMMAND_END 0x20
+#define AMDKFD_COMMAND_END 0x22
#endif
--
2.27.0
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