drm/amdkfd: remove duplicated PCIE atomics request

Since amdgpu has always requested PCIE atomics, kfd don't
need duplicated PCIE atomics enablement. Referring to amdgpu
request result is enough.
Signed-off-by: Jack Xiao <Jack.Xiao@amd.com>
Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.c

@@ -668,6 +668,13 @@ bool amdgpu_amdkfd_is_kfd_vmid(struct amdgpu_device *adev, u32 vmid)
 	return false;
 }
 
+bool amdgpu_amdkfd_have_atomics_support(struct kgd_dev *kgd)
+{
+	struct amdgpu_device *adev = (struct amdgpu_device *)kgd;
+
+	return adev->have_atomics_support;
+}
+
 #ifndef CONFIG_HSA_AMD
 bool amdkfd_fence_check_mm(struct dma_fence *f, struct mm_struct *mm)
 {

drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd.h

@@ -135,6 +135,7 @@ int amdgpu_amdkfd_submit_ib(struct kgd_dev *kgd, enum kgd_engine_type engine,
 				uint32_t vmid, uint64_t gpu_addr,
 				uint32_t *ib_cmd, uint32_t ib_len);
 void amdgpu_amdkfd_set_compute_idle(struct kgd_dev *kgd, bool idle);
+bool amdgpu_amdkfd_have_atomics_support(struct kgd_dev *kgd);
 
 struct kfd2kgd_calls *amdgpu_amdkfd_gfx_7_get_functions(void);
 struct kfd2kgd_calls *amdgpu_amdkfd_gfx_8_0_get_functions(void);

drivers/gpu/drm/amd/amdkfd/kfd_device.c

@@ -504,17 +504,15 @@ struct kfd_dev *kgd2kfd_probe(struct kgd_dev *kgd,
 	 * 32 and 64-bit requests are possible and must be
 	 * supported.
 	 */
-	ret = pci_enable_atomic_ops_to_root(pdev,
-			PCI_EXP_DEVCAP2_ATOMIC_COMP32 |
-			PCI_EXP_DEVCAP2_ATOMIC_COMP64);
-	if (device_info->needs_pci_atomics && ret < 0) {
+	kfd->pci_atomic_requested = amdgpu_amdkfd_have_atomics_support(kgd);
+	if (device_info->needs_pci_atomics &&
+	    !kfd->pci_atomic_requested) {
 		dev_info(kfd_device,
 			 "skipped device %x:%x, PCI rejects atomics\n",
 			 pdev->vendor, pdev->device);
 		kfree(kfd);
 		return NULL;
-	} else if (!ret)
-		kfd->pci_atomic_requested = true;
+	}
 
 	kfd->kgd = kgd;
 	kfd->device_info = device_info;