This patch adds basic eviction fence framework for the gfx buffers.
The idea is to:
- One eviction fence is created per gfx process, at kms_open.
- This same fence is attached to all the gem buffers created
by this process.
This framework will be further used for usermode queues.
V2: Addressed review comments from Christian
- keep fence_ctx and fence_seq directly in fpriv
- evcition_fence should be dynamically allocated
- do not save eviction fence instance in BO, there could be many
such fences attached to one BO
- use dma_resv_replace_fence() in detach
Cc: Christian Koenig <christian.koe...@amd.com>
Cc: Alex Deucher <alexander.deuc...@amd.com>
Signed-off-by: Shashank Sharma <shashank.sha...@amd.com>
---
drivers/gpu/drm/amd/amdgpu/Makefile | 2 +-
drivers/gpu/drm/amd/amdgpu/amdgpu.h | 20 ++++
.../drm/amd/amdgpu/amdgpu_eviction_fence.c | 106 ++++++++++++++++++
drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c | 10 +-
drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c | 8 +-
5 files changed, 143 insertions(+), 3 deletions(-)
create mode 100644 drivers/gpu/drm/amd/amdgpu/amdgpu_eviction_fence.c
diff --git a/drivers/gpu/drm/amd/amdgpu/Makefile
b/drivers/gpu/drm/amd/amdgpu/Makefile
index b0103f404957..9743bf06d6aa 100644
--- a/drivers/gpu/drm/amd/amdgpu/Makefile
+++ b/drivers/gpu/drm/amd/amdgpu/Makefile
@@ -82,7 +82,7 @@ amdgpu-y += amdgpu_device.o amdgpu_doorbell_mgr.o
amdgpu_kms.o \
amdgpu_fw_attestation.o amdgpu_securedisplay.o \
amdgpu_eeprom.o amdgpu_mca.o amdgpu_psp_ta.o amdgpu_lsdma.o \
amdgpu_ring_mux.o amdgpu_xcp.o amdgpu_seq64.o amdgpu_aca.o \
- amdgpu_userq_fence.o
+ amdgpu_userq_fence.o amdgpu_eviction_fence.o
amdgpu-$(CONFIG_PROC_FS) += amdgpu_fdinfo.o
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
index 2d5ef2e74c71..a37193fc9ddc 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -465,6 +465,11 @@ struct amdgpu_flip_work {
bool async;
};
+struct amdgpu_eviction_fence {
+ struct dma_fence base;
+ spinlock_t lock;
+ char timeline_name[TASK_COMM_LEN];
+};
/*
* file private structure
@@ -479,6 +484,12 @@ struct amdgpu_fpriv {
struct idr bo_list_handles;
struct amdgpu_ctx_mgr ctx_mgr;
struct amdgpu_userq_mgr userq_mgr;
+
+ /* Eviction fence infra */
+ u64 ev_fence_ctx;
+ atomic_t ev_fence_seq;
+ struct amdgpu_eviction_fence *ev_fence;
+
/** GPU partition selection */
uint32_t xcp_id;
};
@@ -1480,6 +1491,15 @@ void amdgpu_disable_vblank_kms(struct drm_crtc *crtc);
int amdgpu_info_ioctl(struct drm_device *dev, void *data,
struct drm_file *filp);
+/* Eviction fence */
+struct amdgpu_eviction_fence *amdgpu_eviction_fence_create(struct amdgpu_fpriv
*fpriv);
+void amdgpu_eviction_fence_destroy(struct amdgpu_fpriv *fpriv);
+int amdgpu_eviction_fence_attach(struct amdgpu_eviction_fence *ev_fence,
+ struct amdgpu_bo *bo);
+void amdgpu_eviction_fence_detach(struct amdgpu_fpriv *fpriv,
+ struct amdgpu_eviction_fence *ev_fence,
+ struct amdgpu_bo *bo);
+
/*
* functions used by amdgpu_encoder.c
*/
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_eviction_fence.c
b/drivers/gpu/drm/amd/amdgpu/amdgpu_eviction_fence.c
new file mode 100644
index 000000000000..1a03f040ccc8
--- /dev/null
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_eviction_fence.c
@@ -0,0 +1,106 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright 2024 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/sched.h>
+#include "amdgpu.h"
+
+static const char *
+amdgpu_ev_fence_get_driver_name(struct dma_fence *fence)
+{
+ return "amdgpu";
+}
+
+static const char *
+amdgpu_ev_fence_get_timeline_name(struct dma_fence *f)
+{
+ struct amdgpu_eviction_fence *ef;
+
+ ef = container_of(f, struct amdgpu_eviction_fence, base);
+ return ef->timeline_name;
+}
+
+static const struct dma_fence_ops amdgpu_eviction_fence_ops = {
+ .use_64bit_seqno = true,
+ .get_driver_name = amdgpu_ev_fence_get_driver_name,
+ .get_timeline_name = amdgpu_ev_fence_get_timeline_name,
+};
+
+struct amdgpu_eviction_fence *
+amdgpu_eviction_fence_create(struct amdgpu_fpriv *fpriv)
+{
+ struct amdgpu_eviction_fence *ev_fence;
+ atomic_t seq = ATOMIC_INIT(0);
+
+ ev_fence = kzalloc(sizeof(*ev_fence), GFP_KERNEL);
+ if (!ev_fence)
+ return NULL;
+
+ spin_lock_init(&ev_fence->lock);
+ fpriv->ev_fence_seq = seq;
+ fpriv->ev_fence_ctx = dma_fence_context_alloc(1);
+ dma_fence_init(&ev_fence->base, &amdgpu_eviction_fence_ops,
+ &ev_fence->lock, fpriv->ev_fence_ctx,
+ atomic_inc_return(&fpriv->ev_fence_seq));
+
+ return ev_fence;
+}
+
+void amdgpu_eviction_fence_destroy(struct amdgpu_fpriv *fpriv)
+{
+ kfree(fpriv->ev_fence);
+}
+
+int amdgpu_eviction_fence_attach(struct amdgpu_eviction_fence *ev_fence,
+ struct amdgpu_bo *bo)
+{
+ struct dma_fence *ef = &ev_fence->base;
+ struct dma_resv *resv = bo->tbo.base.resv;
+ int ret;
+
+ ret = dma_resv_reserve_fences(resv, 1);
+ if (ret) {
+ dma_fence_wait(ef, false);
+ return ret;
+ }
+
+ dma_resv_add_fence(resv, ef, DMA_RESV_USAGE_BOOKKEEP);
+ dma_fence_get(ef);
+ return 0;
+}
+
+void amdgpu_eviction_fence_detach(struct amdgpu_fpriv *fpriv,
+ struct amdgpu_eviction_fence *ev_fence,
+ struct amdgpu_bo *bo)
+{
+ struct dma_fence *stub;
+ struct dma_fence *ef = &ev_fence->base;
+
+ stub = dma_fence_get_stub();
+ dma_resv_replace_fences(bo->tbo.base.resv, fpriv->ev_fence_ctx,
+ stub, DMA_RESV_USAGE_BOOKKEEP);
+
+ if (!dma_fence_is_signaled(ef))
+ dma_fence_put(ef);
+ dma_fence_put(stub);
+}
+
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
b/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
index 85f1c05890bb..3355b750a652 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
@@ -199,8 +199,14 @@ static int amdgpu_gem_object_open(struct drm_gem_object
*obj,
* but not for export, this is a different lock class that cannot lead
to
* circular lock dependencies.
*/
- if (!vm->is_compute_context || !vm->process_info)
+ if (!vm->is_compute_context || !vm->process_info) {
+ /* attach gfx eviction fence */
+ if (amdgpu_eviction_fence_attach(fpriv->ev_fence, abo))
+ DRM_DEBUG_DRIVER("Failed to attach eviction fence to
BO\n");
+
return 0;
+ }
+
if (!obj->import_attach ||
!dma_buf_is_dynamic(obj->import_attach->dmabuf))
return 0;
@@ -236,6 +242,8 @@ static void amdgpu_gem_object_close(struct drm_gem_object
*obj,
struct drm_exec exec;
long r;
+ amdgpu_eviction_fence_detach(fpriv, fpriv->ev_fence, bo);
+
drm_exec_init(&exec, DRM_EXEC_IGNORE_DUPLICATES, 0);
drm_exec_until_all_locked(&exec) {
r = drm_exec_prepare_obj(&exec, &bo->tbo.base, 1);
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
index d78b06af834e..9f4ffd195fea 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_kms.c
@@ -1294,7 +1294,6 @@ int amdgpu_info_ioctl(struct drm_device *dev, void *data,
struct drm_file *filp)
return 0;
}
-
/*
* Outdated mess for old drm with Xorg being in charge (void function now).
*/
@@ -1387,6 +1386,12 @@ int amdgpu_driver_open_kms(struct drm_device *dev,
struct drm_file *file_priv)
mutex_init(&fpriv->bo_list_lock);
idr_init_base(&fpriv->bo_list_handles, 1);
+ fpriv->ev_fence = amdgpu_eviction_fence_create(fpriv);
+ if (!fpriv->ev_fence) {
+ DRM_ERROR("Failed to craete eviction fence\n");
+ goto error_vm;
+ }
+
amdgpu_ctx_mgr_init(&fpriv->ctx_mgr, adev);
r = amdgpu_userq_mgr_init(&fpriv->userq_mgr, adev);
@@ -1460,6 +1465,7 @@ void amdgpu_driver_postclose_kms(struct drm_device *dev,
amdgpu_bo_unreserve(pd);
}
+ amdgpu_eviction_fence_destroy(fpriv);
amdgpu_ctx_mgr_fini(&fpriv->ctx_mgr);
amdgpu_vm_fini(adev, &fpriv->vm);
amdgpu_userq_mgr_fini(&fpriv->userq_mgr);
--
2.43.2
