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From 0c9943d2bd46c230091568c08411de879426ea4c Mon Sep 17 00:00:00 2001
From: Felix Kuehling <Felix.Kuehling@amd.com>
Date: Thu, 4 Jan 2018 17:17:41 -0500
Subject: [PATCH 5685/5725] drm/amdkfd: Conditionally enable PCIe atomics
This will be needed for most dGPUs.
CC: linux-pci@vger.kernel.org
Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
Reviewed-by: Oded Gabbay <oded.gabbay@gmail.com>
Signed-off-by: Oded Gabbay <oded.gabbay@gmail.com>
---
drivers/gpu/drm/amd/amdkfd/kfd_device.c | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_device.c b/drivers/gpu/drm/amd/amdkfd/kfd_device.c
index d9505d2..20a20ed 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_device.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_device.c
@@ -400,6 +400,20 @@ struct kfd_dev *kgd2kfd_probe(struct kgd_dev *kgd,
dev_err(kfd_device, "kgd2kfd_probe failed\n");
return NULL;
}
+ if (device_info->needs_pci_atomics) {
+ /* Allow BIF to recode atomics to PCIe 3.0
+ * AtomicOps. 32 and 64-bit requests are possible and
+ * must be supported.
+ */
+ if (pci_enable_atomic_ops_to_root(pdev,
+ PCI_EXP_DEVCAP2_ATOMIC_COMP32 |
+ PCI_EXP_DEVCAP2_ATOMIC_COMP64) < 0) {
+ dev_info(kfd_device,
+ "skipped device %x:%x, PCI rejects atomics",
+ pdev->vendor, pdev->device);
+ return NULL;
+ }
+ }
kfd = kzalloc(sizeof(*kfd), GFP_KERNEL);
if (!kfd)
--
2.7.4
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