Merge tag 'gvt-next-2021-03-16' of https://github.com/intel/gvt-linux into drm-intel-next

gvt-next-2021-03-16

- Parse accurate vGPU virtual display rate (Colin)
- Convert vblank timer as per-vGPU based on current rate (Colin)
- spelling fix (Bhaskar)

Signed-off-by: Jani Nikula <jani.nikula@intel.com>
From: Zhenyu Wang <zhenyuw@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210316074330.GC1551@zhen-hp.sh.intel.com

1 files changed, 255 insertions, 6 deletions

diff --git a/drivers/gpu/drm/i915/gvt/handlers.c b/drivers/gpu/drm/i915/gvt/handlers.c
index 6eeaeecb7f85..477badfcb258 100644
--- a/drivers/gpu/drm/i915/gvt/handlers.c
+++ b/drivers/gpu/drm/i915/gvt/handlers.c
@@ -39,6 +39,7 @@
 #include "i915_drv.h"
 #include "gvt.h"
 #include "i915_pvinfo.h"
+#include "display/intel_display_types.h"
 
 /* XXX FIXME i915 has changed PP_XXX definition */
 #define PCH_PP_STATUS  _MMIO(0xc7200)
@@ -443,6 +444,254 @@ static int dpy_reg_mmio_read(struct intel_vgpu *vgpu, unsigned int offset,
 	return 0;
 }
 
+/*
+ * Only PIPE_A is enabled in current vGPU display and PIPE_A is tied to
+ *   TRANSCODER_A in HW. DDI/PORT could be PORT_x depends on
+ *   setup_virtual_dp_monitor().
+ * emulate_monitor_status_change() set up PLL for PORT_x as the initial enabled
+ *   DPLL. Later guest driver may setup a different DPLLx when setting mode.
+ * So the correct sequence to find DP stream clock is:
+ *   Check TRANS_DDI_FUNC_CTL on TRANSCODER_A to get PORT_x.
+ *   Check correct PLLx for PORT_x to get PLL frequency and DP bitrate.
+ * Then Refresh rate then can be calculated based on follow equations:
+ *   Pixel clock = h_total * v_total * refresh_rate
+ *   stream clock = Pixel clock
+ *   ls_clk = DP bitrate
+ *   Link M/N = strm_clk / ls_clk
+ */
+
+static u32 bdw_vgpu_get_dp_bitrate(struct intel_vgpu *vgpu, enum port port)
+{
+	u32 dp_br = 0;
+	u32 ddi_pll_sel = vgpu_vreg_t(vgpu, PORT_CLK_SEL(port));
+
+	switch (ddi_pll_sel) {
+	case PORT_CLK_SEL_LCPLL_2700:
+		dp_br = 270000 * 2;
+		break;
+	case PORT_CLK_SEL_LCPLL_1350:
+		dp_br = 135000 * 2;
+		break;
+	case PORT_CLK_SEL_LCPLL_810:
+		dp_br = 81000 * 2;
+		break;
+	case PORT_CLK_SEL_SPLL:
+	{
+		switch (vgpu_vreg_t(vgpu, SPLL_CTL) & SPLL_FREQ_MASK) {
+		case SPLL_FREQ_810MHz:
+			dp_br = 81000 * 2;
+			break;
+		case SPLL_FREQ_1350MHz:
+			dp_br = 135000 * 2;
+			break;
+		case SPLL_FREQ_2700MHz:
+			dp_br = 270000 * 2;
+			break;
+		default:
+			gvt_dbg_dpy("vgpu-%d PORT_%c can't get freq from SPLL 0x%08x\n",
+				    vgpu->id, port_name(port), vgpu_vreg_t(vgpu, SPLL_CTL));
+			break;
+		}
+		break;
+	}
+	case PORT_CLK_SEL_WRPLL1:
+	case PORT_CLK_SEL_WRPLL2:
+	{
+		u32 wrpll_ctl;
+		int refclk, n, p, r;
+
+		if (ddi_pll_sel == PORT_CLK_SEL_WRPLL1)
+			wrpll_ctl = vgpu_vreg_t(vgpu, WRPLL_CTL(DPLL_ID_WRPLL1));
+		else
+			wrpll_ctl = vgpu_vreg_t(vgpu, WRPLL_CTL(DPLL_ID_WRPLL2));
+
+		switch (wrpll_ctl & WRPLL_REF_MASK) {
+		case WRPLL_REF_PCH_SSC:
+			refclk = vgpu->gvt->gt->i915->dpll.ref_clks.ssc;
+			break;
+		case WRPLL_REF_LCPLL:
+			refclk = 2700000;
+			break;
+		default:
+			gvt_dbg_dpy("vgpu-%d PORT_%c WRPLL can't get refclk 0x%08x\n",
+				    vgpu->id, port_name(port), wrpll_ctl);
+			goto out;
+		}
+
+		r = wrpll_ctl & WRPLL_DIVIDER_REF_MASK;
+		p = (wrpll_ctl & WRPLL_DIVIDER_POST_MASK) >> WRPLL_DIVIDER_POST_SHIFT;
+		n = (wrpll_ctl & WRPLL_DIVIDER_FB_MASK) >> WRPLL_DIVIDER_FB_SHIFT;
+
+		dp_br = (refclk * n / 10) / (p * r) * 2;
+		break;
+	}
+	default:
+		gvt_dbg_dpy("vgpu-%d PORT_%c has invalid clock select 0x%08x\n",
+			    vgpu->id, port_name(port), vgpu_vreg_t(vgpu, PORT_CLK_SEL(port)));
+		break;
+	}
+
+out:
+	return dp_br;
+}
+
+static u32 bxt_vgpu_get_dp_bitrate(struct intel_vgpu *vgpu, enum port port)
+{
+	u32 dp_br = 0;
+	int refclk = vgpu->gvt->gt->i915->dpll.ref_clks.nssc;
+	enum dpio_phy phy = DPIO_PHY0;
+	enum dpio_channel ch = DPIO_CH0;
+	struct dpll clock = {0};
+	u32 temp;
+
+	/* Port to PHY mapping is fixed, see bxt_ddi_phy_info{} */
+	switch (port) {
+	case PORT_A:
+		phy = DPIO_PHY1;
+		ch = DPIO_CH0;
+		break;
+	case PORT_B:
+		phy = DPIO_PHY0;
+		ch = DPIO_CH0;
+		break;
+	case PORT_C:
+		phy = DPIO_PHY0;
+		ch = DPIO_CH1;
+		break;
+	default:
+		gvt_dbg_dpy("vgpu-%d no PHY for PORT_%c\n", vgpu->id, port_name(port));
+		goto out;
+	}
+
+	temp = vgpu_vreg_t(vgpu, BXT_PORT_PLL_ENABLE(port));
+	if (!(temp & PORT_PLL_ENABLE) || !(temp & PORT_PLL_LOCK)) {
+		gvt_dbg_dpy("vgpu-%d PORT_%c PLL_ENABLE 0x%08x isn't enabled or locked\n",
+			    vgpu->id, port_name(port), temp);
+		goto out;
+	}
+
+	clock.m1 = 2;
+	clock.m2 = (vgpu_vreg_t(vgpu, BXT_PORT_PLL(phy, ch, 0)) & PORT_PLL_M2_MASK) << 22;
+	if (vgpu_vreg_t(vgpu, BXT_PORT_PLL(phy, ch, 3)) & PORT_PLL_M2_FRAC_ENABLE)
+		clock.m2 |= vgpu_vreg_t(vgpu, BXT_PORT_PLL(phy, ch, 2)) & PORT_PLL_M2_FRAC_MASK;
+	clock.n = (vgpu_vreg_t(vgpu, BXT_PORT_PLL(phy, ch, 1)) & PORT_PLL_N_MASK) >> PORT_PLL_N_SHIFT;
+	clock.p1 = (vgpu_vreg_t(vgpu, BXT_PORT_PLL_EBB_0(phy, ch)) & PORT_PLL_P1_MASK) >> PORT_PLL_P1_SHIFT;
+	clock.p2 = (vgpu_vreg_t(vgpu, BXT_PORT_PLL_EBB_0(phy, ch)) & PORT_PLL_P2_MASK) >> PORT_PLL_P2_SHIFT;
+	clock.m = clock.m1 * clock.m2;
+	clock.p = clock.p1 * clock.p2;
+
+	if (clock.n == 0 || clock.p == 0) {
+		gvt_dbg_dpy("vgpu-%d PORT_%c PLL has invalid divider\n", vgpu->id, port_name(port));
+		goto out;
+	}
+
+	clock.vco = DIV_ROUND_CLOSEST_ULL(mul_u32_u32(refclk, clock.m), clock.n << 22);
+	clock.dot = DIV_ROUND_CLOSEST(clock.vco, clock.p);
+
+	dp_br = clock.dot / 5;
+
+out:
+	return dp_br;
+}
+
+static u32 skl_vgpu_get_dp_bitrate(struct intel_vgpu *vgpu, enum port port)
+{
+	u32 dp_br = 0;
+	enum intel_dpll_id dpll_id = DPLL_ID_SKL_DPLL0;
+
+	/* Find the enabled DPLL for the DDI/PORT */
+	if (!(vgpu_vreg_t(vgpu, DPLL_CTRL2) & DPLL_CTRL2_DDI_CLK_OFF(port)) &&
+	    (vgpu_vreg_t(vgpu, DPLL_CTRL2) & DPLL_CTRL2_DDI_SEL_OVERRIDE(port))) {
+		dpll_id += (vgpu_vreg_t(vgpu, DPLL_CTRL2) &
+			DPLL_CTRL2_DDI_CLK_SEL_MASK(port)) >>
+			DPLL_CTRL2_DDI_CLK_SEL_SHIFT(port);
+	} else {
+		gvt_dbg_dpy("vgpu-%d DPLL for PORT_%c isn't turned on\n",
+			    vgpu->id, port_name(port));
+		return dp_br;
+	}
+
+	/* Find PLL output frequency from correct DPLL, and get bir rate */
+	switch ((vgpu_vreg_t(vgpu, DPLL_CTRL1) &
+		DPLL_CTRL1_LINK_RATE_MASK(dpll_id)) >>
+		DPLL_CTRL1_LINK_RATE_SHIFT(dpll_id)) {
+		case DPLL_CTRL1_LINK_RATE_810:
+			dp_br = 81000 * 2;
+			break;
+		case DPLL_CTRL1_LINK_RATE_1080:
+			dp_br = 108000 * 2;
+			break;
+		case DPLL_CTRL1_LINK_RATE_1350:
+			dp_br = 135000 * 2;
+			break;
+		case DPLL_CTRL1_LINK_RATE_1620:
+			dp_br = 162000 * 2;
+			break;
+		case DPLL_CTRL1_LINK_RATE_2160:
+			dp_br = 216000 * 2;
+			break;
+		case DPLL_CTRL1_LINK_RATE_2700:
+			dp_br = 270000 * 2;
+			break;
+		default:
+			dp_br = 0;
+			gvt_dbg_dpy("vgpu-%d PORT_%c fail to get DPLL-%d freq\n",
+				    vgpu->id, port_name(port), dpll_id);
+	}
+
+	return dp_br;
+}
+
+static void vgpu_update_refresh_rate(struct intel_vgpu *vgpu)
+{
+	struct drm_i915_private *dev_priv = vgpu->gvt->gt->i915;
+	enum port port;
+	u32 dp_br, link_m, link_n, htotal, vtotal;
+
+	/* Find DDI/PORT assigned to TRANSCODER_A, expect B or D */
+	port = (vgpu_vreg_t(vgpu, TRANS_DDI_FUNC_CTL(TRANSCODER_A)) &
+		TRANS_DDI_PORT_MASK) >> TRANS_DDI_PORT_SHIFT;
+	if (port != PORT_B && port != PORT_D) {
+		gvt_dbg_dpy("vgpu-%d unsupported PORT_%c\n", vgpu->id, port_name(port));
+		return;
+	}
+
+	/* Calculate DP bitrate from PLL */
+	if (IS_BROADWELL(dev_priv))
+		dp_br = bdw_vgpu_get_dp_bitrate(vgpu, port);
+	else if (IS_BROXTON(dev_priv))
+		dp_br = bxt_vgpu_get_dp_bitrate(vgpu, port);
+	else
+		dp_br = skl_vgpu_get_dp_bitrate(vgpu, port);
+
+	/* Get DP link symbol clock M/N */
+	link_m = vgpu_vreg_t(vgpu, PIPE_LINK_M1(TRANSCODER_A));
+	link_n = vgpu_vreg_t(vgpu, PIPE_LINK_N1(TRANSCODER_A));
+
+	/* Get H/V total from transcoder timing */
+	htotal = (vgpu_vreg_t(vgpu, HTOTAL(TRANSCODER_A)) >> TRANS_HTOTAL_SHIFT) + 1;
+	vtotal = (vgpu_vreg_t(vgpu, VTOTAL(TRANSCODER_A)) >> TRANS_VTOTAL_SHIFT) + 1;
+
+	if (dp_br && link_n && htotal && vtotal) {
+		u64 pixel_clk = 0;
+		u32 new_rate = 0;
+		u32 *old_rate = &(intel_vgpu_port(vgpu, vgpu->display.port_num)->vrefresh_k);
+
+		/* Calcuate pixel clock by (ls_clk * M / N) */
+		pixel_clk = div_u64(mul_u32_u32(link_m, dp_br), link_n);
+		pixel_clk *= MSEC_PER_SEC;
+
+		/* Calcuate refresh rate by (pixel_clk / (h_total * v_total)) */
+		new_rate = DIV64_U64_ROUND_CLOSEST(pixel_clk, div64_u64(mul_u32_u32(htotal, vtotal), MSEC_PER_SEC));
+
+		if (*old_rate != new_rate)
+			*old_rate = new_rate;
+
+		gvt_dbg_dpy("vgpu-%d PIPE_%c refresh rate updated to %d\n",
+			    vgpu->id, pipe_name(PIPE_A), new_rate);
+	}
+}
+
 static int pipeconf_mmio_write(struct intel_vgpu *vgpu, unsigned int offset,
 		void *p_data, unsigned int bytes)
 {
@@ -451,14 +700,14 @@ static int pipeconf_mmio_write(struct intel_vgpu *vgpu, unsigned int offset,
 	write_vreg(vgpu, offset, p_data, bytes);
 	data = vgpu_vreg(vgpu, offset);
 
-	if (data & PIPECONF_ENABLE)
+	if (data & PIPECONF_ENABLE) {
 		vgpu_vreg(vgpu, offset) |= I965_PIPECONF_ACTIVE;
-	else
+		vgpu_update_refresh_rate(vgpu);
+		vgpu_update_vblank_emulation(vgpu, true);
+	} else {
 		vgpu_vreg(vgpu, offset) &= ~I965_PIPECONF_ACTIVE;
-	/* vgpu_lock already hold by emulate mmio r/w */
-	mutex_unlock(&vgpu->vgpu_lock);
-	intel_gvt_check_vblank_emulation(vgpu->gvt);
-	mutex_lock(&vgpu->vgpu_lock);
+		vgpu_update_vblank_emulation(vgpu, false);
+	}
 	return 0;
 }