drm/amd/amdgpu: For virtual display, enable multi crtcs. (v3)

Enable multi crtcs for virtual display, user can set the number of crtcs
by amdgpu module parameter  virtual_display.

v2: make timers per crtc
v3: agd: simplify implementation
Signed-off-by: Emily Deng <Emily.Deng@amd.com>
Reviewed-By: Emily Deng <Emily.Deng@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_device.c

@@ -1238,20 +1238,38 @@ static void amdgpu_device_enable_virtual_display(struct amdgpu_device *adev)
 	if (amdgpu_virtual_display) {
 		struct drm_device *ddev = adev->ddev;
 		const char *pci_address_name = pci_name(ddev->pdev);
-		char *pciaddstr, *pciaddstr_tmp, *pciaddname;
+		char *pciaddstr, *pciaddstr_tmp, *pciaddname_tmp, *pciaddname;
 
 		pciaddstr = kstrdup(amdgpu_virtual_display, GFP_KERNEL);
 		pciaddstr_tmp = pciaddstr;
-		while ((pciaddname = strsep(&pciaddstr_tmp, ";"))) {
+		while ((pciaddname_tmp = strsep(&pciaddstr_tmp, ";"))) {
+			pciaddname = strsep(&pciaddname_tmp, ",");
 			if (!strcmp(pci_address_name, pciaddname)) {
+				long num_crtc;
+				int res = -1;
+
 				adev->enable_virtual_display = true;
+
+				if (pciaddname_tmp)
+					res = kstrtol(pciaddname_tmp, 10,
+						      &num_crtc);
+
+				if (!res) {
+					if (num_crtc < 1)
+						num_crtc = 1;
+					if (num_crtc > 6)
+						num_crtc = 6;
+					adev->mode_info.num_crtc = num_crtc;
+				} else {
+					adev->mode_info.num_crtc = 1;
+				}
 				break;
 			}
 		}
 
-		DRM_INFO("virtual display string:%s, %s:virtual_display:%d\n",
+		DRM_INFO("virtual display string:%s, %s:virtual_display:%d, num_crtc:%d\n",
 			 amdgpu_virtual_display, pci_address_name,
-				 adev->enable_virtual_display);
+			 adev->enable_virtual_display, adev->mode_info.num_crtc);
 
 		kfree(pciaddstr);
 	}

drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c

@@ -201,7 +201,8 @@ module_param_named(pg_mask, amdgpu_pg_mask, uint, 0444);
 MODULE_PARM_DESC(disable_cu, "Disable CUs (se.sh.cu,...)");
 module_param_named(disable_cu, amdgpu_disable_cu, charp, 0444);
 
-MODULE_PARM_DESC(virtual_display, "Enable virtual display feature (the virtual_display will be set like xxxx:xx:xx.x;xxxx:xx:xx.x)");
+MODULE_PARM_DESC(virtual_display,
+		 "Enable virtual display feature (the virtual_display will be set like xxxx:xx:xx.x,x;xxxx:xx:xx.x,x)");
 module_param_named(virtual_display, amdgpu_virtual_display, charp, 0444);
 
 static const struct pci_device_id pciidlist[] = {

drivers/gpu/drm/amd/amdgpu/amdgpu_mode.h

@@ -341,8 +341,6 @@ struct amdgpu_mode_info {
 	int			num_dig; /* number of dig blocks */
 	int			disp_priority;
 	const struct amdgpu_display_funcs *funcs;
-	struct hrtimer vblank_timer;
-	enum amdgpu_interrupt_state vsync_timer_enabled;
 };
 
 #define AMDGPU_MAX_BL_LEVEL 0xFF
@@ -413,6 +411,9 @@ struct amdgpu_crtc {
 	u32 wm_high;
 	u32 lb_vblank_lead_lines;
 	struct drm_display_mode hw_mode;
+	/* for virtual dce */
+	struct hrtimer vblank_timer;
+	enum amdgpu_interrupt_state vsync_timer_enabled;
 };
 
 struct amdgpu_encoder_atom_dig {

drivers/gpu/drm/amd/amdgpu/dce_virtual.c

@@ -335,6 +335,7 @@ static int dce_virtual_crtc_init(struct amdgpu_device *adev, int index)
 	amdgpu_crtc->pll_id = ATOM_PPLL_INVALID;
 	amdgpu_crtc->encoder = NULL;
 	amdgpu_crtc->connector = NULL;
+	amdgpu_crtc->vsync_timer_enabled = AMDGPU_IRQ_STATE_DISABLE;
 	drm_crtc_helper_add(&amdgpu_crtc->base, &dce_virtual_crtc_helper_funcs);
 
 	return 0;
@@ -344,11 +345,9 @@ static int dce_virtual_early_init(void *handle)
 {
 	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
 
-	adev->mode_info.vsync_timer_enabled = AMDGPU_IRQ_STATE_DISABLE;
 	dce_virtual_set_display_funcs(adev);
 	dce_virtual_set_irq_funcs(adev);
 
-	adev->mode_info.num_crtc = 1;
 	adev->mode_info.num_hpd = 1;
 	adev->mode_info.num_dig = 1;
 	return 0;
@@ -756,14 +755,13 @@ static int dce_virtual_pageflip(struct amdgpu_device *adev,
 
 static enum hrtimer_restart dce_virtual_vblank_timer_handle(struct hrtimer *vblank_timer)
 {
-	struct amdgpu_mode_info *mode_info =
-		container_of(vblank_timer, struct amdgpu_mode_info , vblank_timer);
-	struct amdgpu_device *adev =
-		container_of(mode_info, struct amdgpu_device , mode_info);
-	unsigned crtc = 0;
+	struct amdgpu_crtc *amdgpu_crtc = container_of(vblank_timer,
+						       struct amdgpu_crtc, vblank_timer);
+	struct drm_device *ddev = amdgpu_crtc->base.dev;
+	struct amdgpu_device *adev = ddev->dev_private;
 
-	drm_handle_vblank(adev->ddev, crtc);
-	dce_virtual_pageflip(adev, crtc);
+	drm_handle_vblank(ddev, amdgpu_crtc->crtc_id);
+	dce_virtual_pageflip(adev, amdgpu_crtc->crtc_id);
 	hrtimer_start(vblank_timer, ktime_set(0, DCE_VIRTUAL_VBLANK_PERIOD),
 		      HRTIMER_MODE_REL);
 
@@ -779,18 +777,22 @@ static void dce_virtual_set_crtc_vblank_interrupt_state(struct amdgpu_device *ad
 		return;
 	}
 
-	if (state && !adev->mode_info.vsync_timer_enabled) {
+	if (state && !adev->mode_info.crtcs[crtc]->vsync_timer_enabled) {
 		DRM_DEBUG("Enable software vsync timer\n");
-		hrtimer_init(&adev->mode_info.vblank_timer, CLOCK_MONOTONIC, HRTIMER_MODE_REL);
-		hrtimer_set_expires(&adev->mode_info.vblank_timer, ktime_set(0, DCE_VIRTUAL_VBLANK_PERIOD));
-		adev->mode_info.vblank_timer.function = dce_virtual_vblank_timer_handle;
-		hrtimer_start(&adev->mode_info.vblank_timer, ktime_set(0, DCE_VIRTUAL_VBLANK_PERIOD), HRTIMER_MODE_REL);
-	} else if (!state && adev->mode_info.vsync_timer_enabled) {
+		hrtimer_init(&adev->mode_info.crtcs[crtc]->vblank_timer,
+			     CLOCK_MONOTONIC, HRTIMER_MODE_REL);
+		hrtimer_set_expires(&adev->mode_info.crtcs[crtc]->vblank_timer,
+				    ktime_set(0, DCE_VIRTUAL_VBLANK_PERIOD));
+		adev->mode_info.crtcs[crtc]->vblank_timer.function =
+			dce_virtual_vblank_timer_handle;
+		hrtimer_start(&adev->mode_info.crtcs[crtc]->vblank_timer,
+			      ktime_set(0, DCE_VIRTUAL_VBLANK_PERIOD), HRTIMER_MODE_REL);
+	} else if (!state && adev->mode_info.crtcs[crtc]->vsync_timer_enabled) {
 		DRM_DEBUG("Disable software vsync timer\n");
-		hrtimer_cancel(&adev->mode_info.vblank_timer);
+		hrtimer_cancel(&adev->mode_info.crtcs[crtc]->vblank_timer);
 	}
 
-	adev->mode_info.vsync_timer_enabled = state;
+	adev->mode_info.crtcs[crtc]->vsync_timer_enabled = state;
 	DRM_DEBUG("[FM]set crtc %d vblank interrupt state %d\n", crtc, state);
 }
 
@@ -800,13 +802,11 @@ static int dce_virtual_set_crtc_irq_state(struct amdgpu_device *adev,
 					  unsigned type,
 					  enum amdgpu_interrupt_state state)
 {
-	switch (type) {
-	case AMDGPU_CRTC_IRQ_VBLANK1:
-		dce_virtual_set_crtc_vblank_interrupt_state(adev, 0, state);
-		break;
-	default:
-		break;
-	}
+	if (type > AMDGPU_CRTC_IRQ_VBLANK6)
+		return -EINVAL;
+
+	dce_virtual_set_crtc_vblank_interrupt_state(adev, type, state);
+
 	return 0;
 }