[PATCH 2/3] drm/amdgpu:add new file for SRIOV

[Monk Liu]

for SRIOV usage, CSA is only used per device and each
VM will map on it.

Change-Id: Ibc63d87be59d7d89b96117e4d1b7e970a872580d
Signed-off-by: Monk Liu <Monk.Liu at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/Makefile      |   2 +-
 drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c | 105 +++++++++++++++++++++++++++++++
 drivers/gpu/drm/amd/amdgpu/amdgpu_virt.h |   5 ++
 3 files changed, 111 insertions(+), 1 deletion(-)
 create mode 100644 drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c

diff --git a/drivers/gpu/drm/amd/amdgpu/Makefile b/drivers/gpu/drm/amd/amdgpu/Makefile
index 4185b03..0b8e470 100644
--- a/drivers/gpu/drm/amd/amdgpu/Makefile
+++ b/drivers/gpu/drm/amd/amdgpu/Makefile
@@ -30,7 +30,7 @@ amdgpu-y += amdgpu_device.o amdgpu_kms.o \
 	atombios_encoders.o amdgpu_sa.o atombios_i2c.o \
 	amdgpu_prime.o amdgpu_vm.o amdgpu_ib.o amdgpu_pll.o \
 	amdgpu_ucode.o amdgpu_bo_list.o amdgpu_ctx.o amdgpu_sync.o \
-	amdgpu_gtt_mgr.o amdgpu_vram_mgr.o
+	amdgpu_gtt_mgr.o amdgpu_vram_mgr.o amdgpu_virt.o
 
 # add asic specific block
 amdgpu-$(CONFIG_DRM_AMDGPU_CIK)+= cik.o cik_ih.o kv_smc.o kv_dpm.o \
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c
new file mode 100644
index 0000000..243fa10
--- /dev/null
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c
@@ -0,0 +1,105 @@
+/*
+ * Copyright 2016 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 "amdgpu.h"
+
+int amdgpu_allocate_static_csa(struct amdgpu_device *adev)
+{
+	int r;
+	void *ptr;
+
+	r = amdgpu_bo_create_kernel(adev, adev->virt.csa_size, PAGE_SIZE,
+				AMDGPU_GEM_DOMAIN_VRAM, &adev->virt.csa_obj,
+				&adev->virt.csa_vmid0_addr, &ptr);
+	if (r)
+		return r;
+
+	/* gds part take the bottom half buffer */
+	adev->virt.gds_vmid0_addr = adev->virt.csa_vmid0_addr + PAGE_SIZE;
+	memset(ptr, 0, adev->virt.csa_size);
+	return 0;
+}
+
+void amdgpu_deallocate_static_csa(struct amdgpu_device *adev)
+{
+	amdgpu_bo_free_kernel(&adev->virt.csa_obj, &adev->virt.csa_vmid0_addr, NULL);
+}
+
+/*
+ * amdgpu_map_static_csa should be called during amdgpu_vm_init
+ * it maps virtual address "AMDGPU_VA_RESERVED_SIZE - adev->virt.csa_size"
+ * to this VM, and each command submission of GFX should use this virtual
+ * address within META_DATA init package to support SRIOV gfx preemption.
+ */
+
+int amdgpu_map_static_csa(struct amdgpu_device *adev, struct amdgpu_vm *vm)
+{
+	int r;
+	uint64_t vaddr;
+	struct amdgpu_bo_va *bo_va;
+	struct ww_acquire_ctx ticket;
+	struct list_head list, duplicates;
+	struct amdgpu_bo_list_entry pd;
+
+	INIT_LIST_HEAD(&list);
+	INIT_LIST_HEAD(&duplicates);
+	INIT_LIST_HEAD(&vm->vm_virt.csa_tv.head);
+	vm->vm_virt.csa_tv.bo = &adev->virt.csa_obj->tbo;
+	vm->vm_virt.csa_tv.shared = true;
+
+	list_add(&vm->vm_virt.csa_tv.head, &list);
+	amdgpu_vm_get_pd_bo(vm, &list, &pd);
+
+	vaddr = AMDGPU_VA_RESERVED_SIZE - adev->virt.csa_size;
+	r = ttm_eu_reserve_buffers(&ticket, &list, true, &duplicates);
+	if (r) {
+		DRM_ERROR("failed to reserve CSA,PD BOs: err=%d\n", r);
+		return r;
+	}
+
+	bo_va = amdgpu_vm_bo_add(adev, vm, adev->virt.csa_obj);
+	if (!bo_va) {
+		ttm_eu_backoff_reservation(&ticket, &list);
+		DRM_ERROR("failed to create bo_va for static CSA\n");
+		return -ENOMEM;
+	}
+
+	r = amdgpu_vm_bo_map(adev, bo_va, vaddr, 0, adev->virt.csa_size,
+						AMDGPU_PTE_READABLE | AMDGPU_PTE_WRITEABLE |
+						AMDGPU_PTE_EXECUTABLE);
+
+	if (r) {
+		DRM_ERROR("failed to do bo_map on static CSA, err=%d\n", r);
+		amdgpu_vm_bo_rmv(adev, bo_va);
+		ttm_eu_backoff_reservation(&ticket, &list);
+		kfree(bo_va);
+		return r;
+	}
+
+	ttm_eu_backoff_reservation(&ticket, &list);
+
+	vm->vm_virt.csa_bo_va = bo_va;
+	vm->vm_virt.vm_csa_addr = vaddr;
+	vm->vm_virt.vm_gds_addr = vaddr + PAGE_SIZE;
+	return 0;
+}
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.h
index cc36d28..827162a 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.h
@@ -68,4 +68,9 @@ static inline bool is_virtual_machine(void)
 #endif
 }
 
+struct amdgpu_vm;
+int amdgpu_allocate_static_csa(struct amdgpu_device *adev);
+void amdgpu_deallocate_static_csa(struct amdgpu_device *adev);
+int amdgpu_map_static_csa(struct amdgpu_device *adev, struct amdgpu_vm *vm);
+
 #endif
-- 
2.7.4