[PATCH 2/4] drm/amdgpu: Add software ring callbacks for gfx9(v5)

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From: "Jiadong.Zhu" <Jiadong.Zhu@xxxxxxx>

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.

Cc: Christian Koenig <Christian.Koenig@xxxxxxx>
Cc: Luben Tuikov <Luben.Tuikov@xxxxxxx>
Cc: Andrey Grodzovsky <Andrey.Grodzovsky@xxxxxxx>
Signed-off-by: Jiadong.Zhu <Jiadong.Zhu@xxxxxxx>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu.h      |   1 +
 drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.h  |   2 +
 drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c |   7 +-
 drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h |   3 +-
 drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c    | 117 +++++++++++++++++++++--
 5 files changed, 120 insertions(+), 10 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
index 96d058c4cd4b..525df0b4d55f 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -207,6 +207,7 @@ extern bool amdgpu_ignore_bad_page_threshold;
 extern struct amdgpu_watchdog_timer amdgpu_watchdog_timer;
 extern int amdgpu_async_gfx_ring;
 extern int amdgpu_mcbp;
+extern int amdgpu_sw_ring;
 extern int amdgpu_discovery;
 extern int amdgpu_mes;
 extern int amdgpu_mes_kiq;
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.h
index 9996dadb39f7..93b25d9a87f9 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gfx.h
@@ -348,6 +348,8 @@ struct amdgpu_gfx {
 
 	bool				is_poweron;
 
+	/* software ring */
+	unsigned                        num_sw_gfx_rings;
 	struct amdgpu_ring_mux          muxer;
 };
 
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c
index 13db99d653bd..4eaf3bd332f7 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.c
@@ -33,6 +33,7 @@
 
 #include <drm/amdgpu_drm.h>
 #include "amdgpu.h"
+#include "amdgpu_sw_ring.h"
 #include "atom.h"
 
 /*
@@ -121,6 +122,11 @@ void amdgpu_ring_commit(struct amdgpu_ring *ring)
 {
 	uint32_t count;
 
+	if (ring->is_sw_ring) {
+		amdgpu_sw_ring_commit(ring);
+		return;
+	}
+
 	/* We pad to match fetch size */
 	count = ring->funcs->align_mask + 1 -
 		(ring->wptr & ring->funcs->align_mask);
@@ -343,7 +349,6 @@ int amdgpu_ring_init(struct amdgpu_device *adev, struct amdgpu_ring *ring,
  */
 void amdgpu_ring_fini(struct amdgpu_ring *ring)
 {
-
 	/* Not to finish a ring which is not initialized */
 	if (!(ring->adev) ||
 	    (!ring->is_mes_queue && !(ring->adev->rings[ring->idx])))
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h
index 40b1277b4f0c..275b885363c3 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ring.h
@@ -38,7 +38,8 @@ struct amdgpu_vm;
 /* max number of rings */
 #define AMDGPU_MAX_RINGS		28
 #define AMDGPU_MAX_HWIP_RINGS		8
-#define AMDGPU_MAX_GFX_RINGS		2
+/*2 software ring and 1 real ring*/
+#define AMDGPU_MAX_GFX_RINGS		3
 #define AMDGPU_MAX_COMPUTE_RINGS	8
 #define AMDGPU_MAX_VCE_RINGS		3
 #define AMDGPU_MAX_UVD_ENC_RINGS	2
diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c b/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
index 5349ca4d19e3..e85565b0e52a 100644
--- a/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
@@ -47,6 +47,7 @@
 
 #include "amdgpu_ras.h"
 
+#include "amdgpu_sw_ring.h"
 #include "gfx_v9_4.h"
 #include "gfx_v9_0.h"
 #include "gfx_v9_4_2.h"
@@ -55,7 +56,8 @@
 #include "asic_reg/pwr/pwr_10_0_sh_mask.h"
 #include "asic_reg/gc/gc_9_0_default.h"
 
-#define GFX9_NUM_GFX_RINGS     1
+#define GFX9_NUM_GFX_RINGS     3
+#define GFX9_NUM_SW_GFX_RINGS  2
 #define GFX9_MEC_HPD_SIZE 4096
 #define RLCG_UCODE_LOADING_START_ADDRESS 0x00002000L
 #define RLC_SAVE_RESTORE_ADDR_STARTING_OFFSET 0x00000000L
@@ -2270,6 +2272,7 @@ static int gfx_v9_0_compute_ring_init(struct amdgpu_device *adev, int ring_id,
 static int gfx_v9_0_sw_init(void *handle)
 {
 	int i, j, k, r, ring_id;
+	unsigned int hw_prio;
 	struct amdgpu_ring *ring;
 	struct amdgpu_kiq *kiq;
 	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
@@ -2356,13 +2359,41 @@ static int gfx_v9_0_sw_init(void *handle)
 			sprintf(ring->name, "gfx_%d", i);
 		ring->use_doorbell = true;
 		ring->doorbell_index = adev->doorbell_index.gfx_ring0 << 1;
+		ring->is_sw_ring = (adev->gfx.num_sw_gfx_rings > 1) && (i > 0);
+
+		if (adev->gfx.num_sw_gfx_rings > 1 && i == 2)
+			hw_prio = AMDGPU_RING_PRIO_2;
+		else
+			hw_prio = AMDGPU_RING_PRIO_DEFAULT;
+		if (adev->gfx.num_sw_gfx_rings > 0 && i == 0)
+			ring->no_scheduler = true;
+
 		r = amdgpu_ring_init(adev, ring, 1024, &adev->gfx.eop_irq,
 				     AMDGPU_CP_IRQ_GFX_ME0_PIPE0_EOP,
-				     AMDGPU_RING_PRIO_DEFAULT, NULL);
+				     hw_prio, NULL);
 		if (r)
 			return r;
+
+		if (ring->is_sw_ring)
+			ring->wptr = 0;
 	}
 
+	/*init the muxer and add sw rings */
+	if (adev->gfx.num_sw_gfx_rings > 0) {
+		r = amdgpu_ring_mux_init(&adev->gfx.muxer, &adev->gfx.gfx_ring[0],
+				     adev->gfx.num_sw_gfx_rings);
+		if (r) {
+			DRM_ERROR("amdgpu_ring_mux_init failed(%d)\n", r);
+			return r;
+		}
+		for (i = 1; i < adev->gfx.num_gfx_rings; i++) {
+			r = amdgpu_ring_mux_add_sw_ring(&adev->gfx.muxer, &adev->gfx.gfx_ring[i]);
+			if (r) {
+				DRM_ERROR("amdgpu_ring_mux_add_sw_ring failed(%d)\n", r);
+				return r;
+			}
+		}
+	}
 	/* set up the compute queues - allocate horizontally across pipes */
 	ring_id = 0;
 	for (i = 0; i < adev->gfx.mec.num_mec; ++i) {
@@ -2413,6 +2444,9 @@ static int gfx_v9_0_sw_fini(void *handle)
 	int i;
 	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
 
+	if (adev->gfx.num_sw_gfx_rings > 0)
+		amdgpu_ring_mux_fini(&adev->gfx.muxer);
+
 	for (i = 0; i < adev->gfx.num_gfx_rings; i++)
 		amdgpu_ring_fini(&adev->gfx.gfx_ring[i]);
 	for (i = 0; i < adev->gfx.num_compute_rings; i++)
@@ -4709,8 +4743,9 @@ static int gfx_v9_0_early_init(void *handle)
 	if (adev->ip_versions[GC_HWIP][0] == IP_VERSION(9, 4, 1) ||
 	    adev->ip_versions[GC_HWIP][0] == IP_VERSION(9, 4, 2))
 		adev->gfx.num_gfx_rings = 0;
-	else
-		adev->gfx.num_gfx_rings = GFX9_NUM_GFX_RINGS;
+
+	adev->gfx.num_gfx_rings = GFX9_NUM_GFX_RINGS;
+	adev->gfx.num_sw_gfx_rings = GFX9_NUM_SW_GFX_RINGS;
 	adev->gfx.num_compute_rings = min(amdgpu_gfx_get_num_kcq(adev),
 					  AMDGPU_MAX_COMPUTE_RINGS);
 	gfx_v9_0_set_kiq_pm4_funcs(adev);
@@ -5877,7 +5912,11 @@ static int gfx_v9_0_eop_irq(struct amdgpu_device *adev,
 
 	switch (me_id) {
 	case 0:
-		amdgpu_fence_process(&adev->gfx.gfx_ring[0]);
+		if (adev->gfx.num_sw_gfx_rings > 1) {
+			for (i = 1; i <= adev->gfx.num_sw_gfx_rings; i++)
+				amdgpu_fence_process(&adev->gfx.gfx_ring[i]);
+		} else
+			amdgpu_fence_process(&adev->gfx.gfx_ring[0]);
 		break;
 	case 1:
 	case 2:
@@ -6882,6 +6921,62 @@ static const struct amdgpu_ring_funcs gfx_v9_0_ring_funcs_gfx = {
 	.emit_mem_sync = gfx_v9_0_emit_mem_sync,
 };
 
+
+static const struct amdgpu_ring_funcs gfx_v9_0_sw_ring_funcs_gfx = {
+	.type = AMDGPU_RING_TYPE_GFX,
+	.align_mask = 0xff,
+	.nop = PACKET3(PACKET3_NOP, 0x3FFF),
+	.support_64bit_ptrs = true,
+	.secure_submission_supported = true,
+	.vmhub = AMDGPU_GFXHUB_0,
+	.get_rptr = amdgpu_sw_ring_get_rptr_gfx,
+	.get_wptr = amdgpu_sw_ring_get_wptr_gfx,
+	.set_wptr = amdgpu_sw_ring_set_wptr_gfx,
+	.emit_frame_size = /* totally 242 maximum if 16 IBs */
+		5 +  /* COND_EXEC */
+		7 +  /* PIPELINE_SYNC */
+		SOC15_FLUSH_GPU_TLB_NUM_WREG * 5 +
+		SOC15_FLUSH_GPU_TLB_NUM_REG_WAIT * 7 +
+		2 + /* VM_FLUSH */
+		8 +  /* FENCE for VM_FLUSH */
+		20 + /* GDS switch */
+		4 + /* double SWITCH_BUFFER,
+		     * the first COND_EXEC jump to the place just
+		     * prior to this double SWITCH_BUFFER
+		     */
+		5 + /* COND_EXEC */
+		7 +	 /*	HDP_flush */
+		4 +	 /*	VGT_flush */
+		14 + /*	CE_META */
+		31 + /*	DE_META */
+		3 + /* CNTX_CTRL */
+		5 + /* HDP_INVL */
+		8 + 8 + /* FENCE x2 */
+		2 + /* SWITCH_BUFFER */
+		7, /* gfx_v9_0_emit_mem_sync */
+	.emit_ib_size =	4, /* gfx_v9_0_ring_emit_ib_gfx */
+	.emit_ib = gfx_v9_0_ring_emit_ib_gfx,
+	.emit_fence = gfx_v9_0_ring_emit_fence,
+	.emit_pipeline_sync = gfx_v9_0_ring_emit_pipeline_sync,
+	.emit_vm_flush = gfx_v9_0_ring_emit_vm_flush,
+	.emit_gds_switch = gfx_v9_0_ring_emit_gds_switch,
+	.emit_hdp_flush = gfx_v9_0_ring_emit_hdp_flush,
+	.test_ring = gfx_v9_0_ring_test_ring,
+	.test_ib = gfx_v9_0_ring_test_ib,
+	.insert_nop = amdgpu_ring_insert_nop,
+	.pad_ib = amdgpu_ring_generic_pad_ib,
+	.emit_switch_buffer = gfx_v9_ring_emit_sb,
+	.emit_cntxcntl = gfx_v9_ring_emit_cntxcntl,
+	.init_cond_exec = gfx_v9_0_ring_emit_init_cond_exec,
+	.patch_cond_exec = gfx_v9_0_ring_emit_patch_cond_exec,
+	.emit_frame_cntl = gfx_v9_0_ring_emit_frame_cntl,
+	.emit_wreg = gfx_v9_0_ring_emit_wreg,
+	.emit_reg_wait = gfx_v9_0_ring_emit_reg_wait,
+	.emit_reg_write_reg_wait = gfx_v9_0_ring_emit_reg_write_reg_wait,
+	.soft_recovery = gfx_v9_0_ring_soft_recovery,
+	.emit_mem_sync = gfx_v9_0_emit_mem_sync,
+};
+
 static const struct amdgpu_ring_funcs gfx_v9_0_ring_funcs_compute = {
 	.type = AMDGPU_RING_TYPE_COMPUTE,
 	.align_mask = 0xff,
@@ -6956,9 +7051,15 @@ static void gfx_v9_0_set_ring_funcs(struct amdgpu_device *adev)
 
 	adev->gfx.kiq.ring.funcs = &gfx_v9_0_ring_funcs_kiq;
 
-	for (i = 0; i < adev->gfx.num_gfx_rings; i++)
-		adev->gfx.gfx_ring[i].funcs = &gfx_v9_0_ring_funcs_gfx;
-
+	if (adev->gfx.num_sw_gfx_rings > 0) {
+		//first one is the real ring
+		adev->gfx.gfx_ring[0].funcs = &gfx_v9_0_ring_funcs_gfx;
+		for (i = 1; i <= adev->gfx.num_sw_gfx_rings; i++)
+			adev->gfx.gfx_ring[i].funcs = &gfx_v9_0_sw_ring_funcs_gfx;
+	} else {
+		for (i = 0; i < adev->gfx.num_gfx_rings; i++)
+			adev->gfx.gfx_ring[i].funcs = &gfx_v9_0_ring_funcs_gfx;
+	}
 	for (i = 0; i < adev->gfx.num_compute_rings; i++)
 		adev->gfx.compute_ring[i].funcs = &gfx_v9_0_ring_funcs_compute;
 }
-- 
2.25.1




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