drm/amdkfd: Fix reserved SDMA queues handling

This patch fixes a regression caused by a bad merge where
the handling of reserved SDMA queues was accidentally removed.
With the fix, the reserved SDMA queues are again correctly
marked as unavailable for allocation.

Fixes: a805889a ("drm/amdkfd: Update SDMA queue management for GFX9.4.3")
Signed-off-by: Mukul Joshi <mukul.joshi@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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

@@ -106,20 +106,19 @@ static void kfd_device_info_set_sdma_info(struct kfd_dev *kfd)
 		kfd->device_info.num_sdma_queues_per_engine = 8;
 	}
 
+	bitmap_zero(kfd->device_info.reserved_sdma_queues_bitmap, KFD_MAX_SDMA_QUEUES);
+
 	switch (sdma_version) {
 	case IP_VERSION(6, 0, 0):
+	case IP_VERSION(6, 0, 1):
 	case IP_VERSION(6, 0, 2):
 	case IP_VERSION(6, 0, 3):
 		/* Reserve 1 for paging and 1 for gfx */
 		kfd->device_info.num_reserved_sdma_queues_per_engine = 2;
 		/* BIT(0)=engine-0 queue-0; BIT(1)=engine-1 queue-0; BIT(2)=engine-0 queue-1; ... */
-		kfd->device_info.reserved_sdma_queues_bitmap = 0xFULL;
-		break;
-	case IP_VERSION(6, 0, 1):
-		/* Reserve 1 for paging and 1 for gfx */
-		kfd->device_info.num_reserved_sdma_queues_per_engine = 2;
-		/* BIT(0)=engine-0 queue-0; BIT(1)=engine-0 queue-1; ... */
-		kfd->device_info.reserved_sdma_queues_bitmap = 0x3ULL;
+		bitmap_set(kfd->device_info.reserved_sdma_queues_bitmap, 0,
+			   kfd->adev->sdma.num_instances *
+			   kfd->device_info.num_reserved_sdma_queues_per_engine);
 		break;
 	default:
 		break;

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

@@ -123,11 +123,6 @@ unsigned int get_num_xgmi_sdma_queues(struct device_queue_manager *dqm)
 		dqm->dev->kfd->device_info.num_sdma_queues_per_engine;
 }
 
-static inline uint64_t get_reserved_sdma_queues_bitmap(struct device_queue_manager *dqm)
-{
-	return dqm->dev->kfd->device_info.reserved_sdma_queues_bitmap;
-}
-
 static void init_sdma_bitmaps(struct device_queue_manager *dqm)
 {
 	bitmap_zero(dqm->sdma_bitmap, KFD_MAX_SDMA_QUEUES);
@@ -135,6 +130,11 @@ static void init_sdma_bitmaps(struct device_queue_manager *dqm)
 
 	bitmap_zero(dqm->xgmi_sdma_bitmap, KFD_MAX_SDMA_QUEUES);
 	bitmap_set(dqm->xgmi_sdma_bitmap, 0, get_num_xgmi_sdma_queues(dqm));
+
+	/* Mask out the reserved queues */
+	bitmap_andnot(dqm->sdma_bitmap, dqm->sdma_bitmap,
+		      dqm->dev->kfd->device_info.reserved_sdma_queues_bitmap,
+		      KFD_MAX_SDMA_QUEUES);
 }
 
 void program_sh_mem_settings(struct device_queue_manager *dqm,

drivers/gpu/drm/amd/amdkfd/kfd_priv.h

@@ -239,7 +239,7 @@ struct kfd_device_info {
 	uint32_t no_atomic_fw_version;
 	unsigned int num_sdma_queues_per_engine;
 	unsigned int num_reserved_sdma_queues_per_engine;
-	uint64_t reserved_sdma_queues_bitmap;
+	DECLARE_BITMAP(reserved_sdma_queues_bitmap, KFD_MAX_SDMA_QUEUES);
 };
 
 unsigned int kfd_get_num_sdma_engines(struct kfd_node *kdev);