drm/radeon/kms/r600: add support for vline relocs

Provides support for anti-tearing functionality
in the ddx.

Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@linux.ie>

3 files changed, 128 insertions, 1 deletions

diff --git a/drivers/gpu/drm/radeon/r500_reg.h b/drivers/gpu/drm/radeon/r500_reg.h
index e1d5e0331e19..868add6e166d 100644
--- a/drivers/gpu/drm/radeon/r500_reg.h
+++ b/drivers/gpu/drm/radeon/r500_reg.h
@@ -445,6 +445,8 @@
 #define AVIVO_D1MODE_VBLANK_STATUS              0x6534
 #       define AVIVO_VBLANK_ACK                 (1 << 4)
 #define AVIVO_D1MODE_VLINE_START_END            0x6538
+#define AVIVO_D1MODE_VLINE_STATUS               0x653c
+#       define AVIVO_D1MODE_VLINE_STAT          (1 << 12)
 #define AVIVO_DxMODE_INT_MASK                   0x6540
 #       define AVIVO_D1MODE_INT_MASK            (1 << 0)
 #       define AVIVO_D2MODE_INT_MASK            (1 << 8)
@@ -502,6 +504,7 @@
 
 #define AVIVO_D2MODE_VBLANK_STATUS              0x6d34
 #define AVIVO_D2MODE_VLINE_START_END            0x6d38
+#define AVIVO_D2MODE_VLINE_STATUS               0x6d3c
 #define AVIVO_D2MODE_VIEWPORT_START             0x6d80
 #define AVIVO_D2MODE_VIEWPORT_SIZE              0x6d84
 #define AVIVO_D2MODE_EXT_OVERSCAN_LEFT_RIGHT    0x6d88
diff --git a/drivers/gpu/drm/radeon/r600_cs.c b/drivers/gpu/drm/radeon/r600_cs.c
index dd009da0e7a0..20eb66dbb3a4 100644
--- a/drivers/gpu/drm/radeon/r600_cs.c
+++ b/drivers/gpu/drm/radeon/r600_cs.c
@@ -177,13 +177,136 @@ static int r600_cs_packet_next_reloc_nomm(struct radeon_cs_parser *p,
         return 0;
 }
 
+/**
+ * r600_cs_packet_next_vline() - parse userspace VLINE packet
+ * @parser:             parser structure holding parsing context.
+ *
+ * Userspace sends a special sequence for VLINE waits.
+ * PACKET0 - VLINE_START_END + value
+ * PACKET3 - WAIT_REG_MEM poll vline status reg
+ * RELOC (P3) - crtc_id in reloc.
+ *
+ * This function parses this and relocates the VLINE START END
+ * and WAIT_REG_MEM packets to the correct crtc.
+ * It also detects a switched off crtc and nulls out the
+ * wait in that case.
+ */
+static int r600_cs_packet_parse_vline(struct radeon_cs_parser *p)
+{
+        struct drm_mode_object *obj;
+        struct drm_crtc *crtc;
+        struct radeon_crtc *radeon_crtc;
+        struct radeon_cs_packet p3reloc, wait_reg_mem;
+        int crtc_id;
+        int r;
+        uint32_t header, h_idx, reg, wait_reg_mem_info;
+        volatile uint32_t *ib;
+
+        ib = p->ib->ptr;
+
+        /* parse the WAIT_REG_MEM */
+        r = r600_cs_packet_parse(p, &wait_reg_mem, p->idx);
+        if (r)
+                return r;
+
+        /* check its a WAIT_REG_MEM */
+        if (wait_reg_mem.type != PACKET_TYPE3 ||
+            wait_reg_mem.opcode != PACKET3_WAIT_REG_MEM) {
+                DRM_ERROR("vline wait missing WAIT_REG_MEM segment\n");
+                r = -EINVAL;
+                return r;
+        }
+
+        wait_reg_mem_info = radeon_get_ib_value(p, wait_reg_mem.idx + 1);
+        /* bit 4 is reg (0) or mem (1) */
+        if (wait_reg_mem_info & 0x10) {
+                DRM_ERROR("vline WAIT_REG_MEM waiting on MEM rather than REG\n");
+                r = -EINVAL;
+                return r;
+        }
+        /* waiting for value to be equal */
+        if ((wait_reg_mem_info & 0x7) != 0x3) {
+                DRM_ERROR("vline WAIT_REG_MEM function not equal\n");
+                r = -EINVAL;
+                return r;
+        }
+        if ((radeon_get_ib_value(p, wait_reg_mem.idx + 2) << 2) != AVIVO_D1MODE_VLINE_STATUS) {
+                DRM_ERROR("vline WAIT_REG_MEM bad reg\n");
+                r = -EINVAL;
+                return r;
+        }
+
+        if (radeon_get_ib_value(p, wait_reg_mem.idx + 5) != AVIVO_D1MODE_VLINE_STAT) {
+                DRM_ERROR("vline WAIT_REG_MEM bad bit mask\n");
+                r = -EINVAL;
+                return r;
+        }
+
+        /* jump over the NOP */
+        r = r600_cs_packet_parse(p, &p3reloc, p->idx + wait_reg_mem.count + 2);
+        if (r)
+                return r;
+
+        h_idx = p->idx - 2;
+        p->idx += wait_reg_mem.count + 2;
+        p->idx += p3reloc.count + 2;
+
+        header = radeon_get_ib_value(p, h_idx);
+        crtc_id = radeon_get_ib_value(p, h_idx + 2 + 7 + 1);
+        reg = header >> 2;
+        mutex_lock(&p->rdev->ddev->mode_config.mutex);
+        obj = drm_mode_object_find(p->rdev->ddev, crtc_id, DRM_MODE_OBJECT_CRTC);
+        if (!obj) {
+                DRM_ERROR("cannot find crtc %d\n", crtc_id);
+                r = -EINVAL;
+                goto out;
+        }
+        crtc = obj_to_crtc(obj);
+        radeon_crtc = to_radeon_crtc(crtc);
+        crtc_id = radeon_crtc->crtc_id;
+
+        if (!crtc->enabled) {
+                /* if the CRTC isn't enabled - we need to nop out the WAIT_REG_MEM */
+                ib[h_idx + 2] = PACKET2(0);
+                ib[h_idx + 3] = PACKET2(0);
+                ib[h_idx + 4] = PACKET2(0);
+                ib[h_idx + 5] = PACKET2(0);
+                ib[h_idx + 6] = PACKET2(0);
+                ib[h_idx + 7] = PACKET2(0);
+                ib[h_idx + 8] = PACKET2(0);
+        } else if (crtc_id == 1) {
+                switch (reg) {
+                case AVIVO_D1MODE_VLINE_START_END:
+                        header &= ~R600_CP_PACKET0_REG_MASK;
+                        header |= AVIVO_D2MODE_VLINE_START_END >> 2;
+                        break;
+                default:
+                        DRM_ERROR("unknown crtc reloc\n");
+                        r = -EINVAL;
+                        goto out;
+                }
+                ib[h_idx] = header;
+                ib[h_idx + 4] = AVIVO_D2MODE_VLINE_STATUS >> 2;
+        }
+out:
+        mutex_unlock(&p->rdev->ddev->mode_config.mutex);
+        return r;
+}
+
 static int r600_packet0_check(struct radeon_cs_parser *p,
                                 struct radeon_cs_packet *pkt,
                                 unsigned idx, unsigned reg)
 {
+        int r;
+
         switch (reg) {
         case AVIVO_D1MODE_VLINE_START_END:
-        case AVIVO_D2MODE_VLINE_START_END:
+                r = r600_cs_packet_parse_vline(p);
+                if (r) {
+                        DRM_ERROR("No reloc for ib[%d]=0x%04X\n",
+                                        idx, reg);
+                        return r;
+                }
                 break;
         default:
                 printk(KERN_ERR "Forbidden register 0x%04X in cs at %d\n",
diff --git a/drivers/gpu/drm/radeon/radeon_reg.h b/drivers/gpu/drm/radeon/radeon_reg.h
index 21da871a793c..bfa1ab9c93e1 100644
--- a/drivers/gpu/drm/radeon/radeon_reg.h
+++ b/drivers/gpu/drm/radeon/radeon_reg.h
@@ -3333,6 +3333,7 @@
 #       define RADEON_CP_PACKET_MAX_DWORDS          (1 << 12)
 #       define RADEON_CP_PACKET0_REG_MASK           0x000007ff
 #       define R300_CP_PACKET0_REG_MASK             0x00001fff
+#       define R600_CP_PACKET0_REG_MASK             0x0000ffff
 #       define RADEON_CP_PACKET1_REG0_MASK          0x000007ff
 #       define RADEON_CP_PACKET1_REG1_MASK          0x003ff800