drm/amdgpu: Add software ring callbacks for gfx9 (v8)

Set ring functions with software ring callbacks on gfx9.

The software ring could be tested by debugfs_test_ib case.

v2: Set sw_ring 2 to enable software ring by default.
v3: Remove the parameter for software ring enablement.
v4: Use amdgpu_ring_init/fini for software rings.
v5: Update for code format. Fix conflict.
v6: Remove unnecessary checks and enable software ring on gfx9 by default.
v7: Use static array for software ring names and priorities.
v8: Stop creating software rings if no gfx ring existed.

Cc: Christian Koenig <[email protected]>
Cc: Luben Tuikov <[email protected]>
Cc: Andrey Grodzovsky <[email protected]>
Cc: Michel Dänzer <[email protected]>
Cc: Likun Gao <[email protected]>
Signed-off-by: Jiadong.Zhu <[email protected]>
Acked-by: Luben Tuikov <[email protected]>
Acked-by: Huang Rui <[email protected]>
Acked-by: Christian König <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>

1 files changed, 20 insertions, 0 deletions

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring_mux.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring_mux.c
index 6fbf71451e29..a52c4e7e8c39 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring_mux.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring_mux.c
@@ -29,6 +29,14 @@
 
 #define AMDGPU_MUX_RESUBMIT_JIFFIES_TIMEOUT (HZ / 2)
 
+static const struct ring_info {
+	unsigned int hw_pio;
+	const char *ring_name;
+} sw_ring_info[] = {
+	{ AMDGPU_RING_PRIO_DEFAULT, "gfx_low"},
+	{ AMDGPU_RING_PRIO_2, "gfx_high"},
+};
+
 int amdgpu_ring_mux_init(struct amdgpu_ring_mux *mux, struct amdgpu_ring *ring,
 			 unsigned int entry_size)
 {
@@ -219,3 +227,15 @@ void amdgpu_sw_ring_insert_nop(struct amdgpu_ring *ring, uint32_t count)
 {
 	WARN_ON(!ring->is_sw_ring);
 }
+
+const char *amdgpu_sw_ring_name(int idx)
+{
+	return idx < ARRAY_SIZE(sw_ring_info) ?
+		sw_ring_info[idx].ring_name : NULL;
+}
+
+unsigned int amdgpu_sw_ring_priority(int idx)
+{
+	return idx < ARRAY_SIZE(sw_ring_info) ?
+		sw_ring_info[idx].hw_pio : AMDGPU_RING_PRIO_DEFAULT;
+}