[PATCH 2/9] drm/amdkfd: Conditionally enable PCIe atomics

[Felix Kuehling]

This will be needed for most dGPUs.

CC: linux-...@vger.kernel.org
Signed-off-by: Felix Kuehling <felix.kuehl...@amd.com>
---
 drivers/gpu/drm/amd/amdkfd/kfd_device.c | 17 +++++++++++++++++
 drivers/gpu/drm/amd/amdkfd/kfd_priv.h   |  1 +
 2 files changed, 18 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_device.c 
b/drivers/gpu/drm/amd/amdkfd/kfd_device.c
index a8fa33a..fafe971 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_device.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_device.c
@@ -41,6 +41,7 @@ static const struct kfd_device_info kaveri_device_info = {
        .num_of_watch_points = 4,
        .mqd_size_aligned = MQD_SIZE_ALIGNED,
        .supports_cwsr = false,
+       .needs_pci_atomics = false,
 };
 
 static const struct kfd_device_info carrizo_device_info = {
@@ -53,6 +54,7 @@ static const struct kfd_device_info carrizo_device_info = {
        .num_of_watch_points = 4,
        .mqd_size_aligned = MQD_SIZE_ALIGNED,
        .supports_cwsr = true,
+       .needs_pci_atomics = false,
 };
 
 struct kfd_deviceid {
@@ -127,6 +129,21 @@ struct kfd_dev *kgd2kfd_probe(struct kgd_dev *kgd,
                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)
                return NULL;
diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_priv.h 
b/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
index 6a48d29..eebfb1e 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
@@ -158,6 +158,7 @@ struct kfd_device_info {
        uint8_t num_of_watch_points;
        uint16_t mqd_size_aligned;
        bool supports_cwsr;
+       bool needs_pci_atomics;
 };
 
 struct kfd_mem_obj {
-- 
2.7.4

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