drm/amdkfd: Only add bi-directional iolink on GPU with XGMI or largebar (v2)

v2: compile fix

Signed-off-by: shaoyunl <Shaoyun.Liu@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c b/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
index 297b36c..758398b 100644 (file)
--- a/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
@@ -1210,7 +1210,7 @@ err_unlock:
        return ret;
 }
 
-static bool kfd_dev_is_large_bar(struct kfd_dev *dev)
+bool kfd_dev_is_large_bar(struct kfd_dev *dev)
 {
        struct kfd_local_mem_info mem_info;
 

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_crat.c b/drivers/gpu/drm/amd/amdkfd/kfd_crat.c
index 130db4d..d4560f1 100644 (file)
--- a/drivers/gpu/drm/amd/amdkfd/kfd_crat.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_crat.c
@@ -353,8 +353,8 @@ static int kfd_parse_subtype_iolink(struct crat_subtype_iolink *iolink,
        id_from = iolink->proximity_domain_from;
        id_to = iolink->proximity_domain_to;
 
-       pr_debug("Found IO link entry in CRAT table with id_from=%d\n",
-                       id_from);
+       pr_debug("Found IO link entry in CRAT table with id_from=%d, id_to %d\n",
+                       id_from, id_to);
        list_for_each_entry(dev, device_list, list) {
                if (id_from == dev->proximity_domain) {
                        props = kfd_alloc_struct(props);
@@ -391,12 +391,12 @@ static int kfd_parse_subtype_iolink(struct crat_subtype_iolink *iolink,
        /* CPU topology is created before GPUs are detected, so CPU->GPU
         * links are not built at that time. If a PCIe type is discovered, it
         * means a GPU is detected and we are adding GPU->CPU to the topology.
-        * At this time, also add the corresponded CPU->GPU link.
+        * At this time, also add the corresponded CPU->GPU link if GPU
+        * is large bar.
         * For xGMI, we only added the link with one direction in the crat
         * table, add corresponded reversed direction link now.
         */
-       if (props && (props->iolink_type == CRAT_IOLINK_TYPE_PCIEXPRESS ||
-                     props->iolink_type == CRAT_IOLINK_TYPE_XGMI)) {
+       if (props && (iolink->flags & CRAT_IOLINK_FLAGS_BI_DIRECTIONAL)) {
                to_dev = kfd_topology_device_by_proximity_domain(id_to);
                if (!to_dev)
                        return -ENODEV;
@@ -1057,6 +1057,8 @@ static int kfd_fill_gpu_direct_io_link_to_cpu(int *avail_size,
        sub_type_hdr->type = CRAT_SUBTYPE_IOLINK_AFFINITY;
        sub_type_hdr->length = sizeof(struct crat_subtype_iolink);
        sub_type_hdr->flags |= CRAT_SUBTYPE_FLAGS_ENABLED;
+       if (kfd_dev_is_large_bar(kdev))
+               sub_type_hdr->flags |= CRAT_IOLINK_FLAGS_BI_DIRECTIONAL;
 
        /* Fill in IOLINK subtype.
         * TODO: Fill-in other fields of iolink subtype
@@ -1088,7 +1090,8 @@ static int kfd_fill_gpu_xgmi_link_to_gpu(int *avail_size,
 
        sub_type_hdr->type = CRAT_SUBTYPE_IOLINK_AFFINITY;
        sub_type_hdr->length = sizeof(struct crat_subtype_iolink);
-       sub_type_hdr->flags |= CRAT_SUBTYPE_FLAGS_ENABLED;
+       sub_type_hdr->flags |= CRAT_SUBTYPE_FLAGS_ENABLED |
+                              CRAT_IOLINK_FLAGS_BI_DIRECTIONAL;
 
        sub_type_hdr->io_interface_type = CRAT_IOLINK_TYPE_XGMI;
        sub_type_hdr->proximity_domain_from = proximity_domain_from;

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_crat.h b/drivers/gpu/drm/amd/amdkfd/kfd_crat.h
index 7a93aeb..7c3f192 100644 (file)
--- a/drivers/gpu/drm/amd/amdkfd/kfd_crat.h
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_crat.h
@@ -232,7 +232,8 @@ struct crat_subtype_ccompute {
 #define CRAT_IOLINK_FLAGS_NO_ATOMICS_32_BIT    (1 << 2)
 #define CRAT_IOLINK_FLAGS_NO_ATOMICS_64_BIT    (1 << 3)
 #define CRAT_IOLINK_FLAGS_NO_PEER_TO_PEER_DMA  (1 << 4)
-#define CRAT_IOLINK_FLAGS_RESERVED_MASK                0xffffffe0
+#define CRAT_IOLINK_FLAGS_BI_DIRECTIONAL       (1 << 31)
+#define CRAT_IOLINK_FLAGS_RESERVED_MASK                0x7fffffe0
 
 /*
  * IO interface types

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_priv.h b/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
index 6a5418f..05283c9 100644 (file)
--- a/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_priv.h
@@ -696,6 +696,7 @@ struct amdkfd_ioctl_desc {
        unsigned int cmd_drv;
        const char *name;
 };
+bool kfd_dev_is_large_bar(struct kfd_dev *dev);
 
 int kfd_process_create_wq(void);
 void kfd_process_destroy_wq(void);