xf86-video-amdgpu: Branch 'master' - 6 commits

Michel Dänzer daenzer at kemper.freedesktop.org
Wed Aug 30 08:12:49 UTC 2017


 src/amdgpu_bo_helper.c |   20 ++++++++
 src/amdgpu_bo_helper.h |    2 
 src/amdgpu_drv.h       |   14 ++++--
 src/amdgpu_kms.c       |   99 ++++++++++++++++++++++++++++++++++++++++----
 src/amdgpu_pixmap.h    |   46 ++++++++++++--------
 src/drmmode_display.c  |  110 +++++++++++++++++++++++--------------------------
 src/drmmode_display.h  |    8 +++
 7 files changed, 209 insertions(+), 90 deletions(-)

New commits:
commit 639076efb06cdf13a211a8df1acb00c3908992b9
Author: Michel Dänzer <michel.daenzer at amd.com>
Date:   Tue Aug 29 17:24:18 2017 +0900

    Remove drmmode_scanout_free
    
    Not used anymore.
    
    (Cherry picked from radeon commit e4a3df19d588a4310fcb889ef34e205d0e92e4d7)
    Reviewed-by: Alex Deucher <alexander.deucher at amd.com>

diff --git a/src/drmmode_display.c b/src/drmmode_display.c
index 6057699..9c838a8 100644
--- a/src/drmmode_display.c
+++ b/src/drmmode_display.c
@@ -490,16 +490,6 @@ drmmode_crtc_scanout_free(drmmode_crtc_private_ptr drmmode_crtc)
 		DamageDestroy(drmmode_crtc->scanout_damage);
 }
 
-void
-drmmode_scanout_free(ScrnInfoPtr scrn)
-{
-	xf86CrtcConfigPtr xf86_config = XF86_CRTC_CONFIG_PTR(scrn);
-	int c;
-
-	for (c = 0; c < xf86_config->num_crtc; c++)
-		drmmode_crtc_scanout_free(xf86_config->crtc[c]->driver_private);
-}
-
 PixmapPtr
 drmmode_crtc_scanout_create(xf86CrtcPtr crtc, struct drmmode_scanout *scanout,
 			    int width, int height)
diff --git a/src/drmmode_display.h b/src/drmmode_display.h
index eff3429..03134f0 100644
--- a/src/drmmode_display.h
+++ b/src/drmmode_display.h
@@ -208,7 +208,6 @@ extern Bool drmmode_setup_colormap(ScreenPtr pScreen, ScrnInfoPtr pScrn);
 
 extern void drmmode_crtc_scanout_destroy(drmmode_ptr drmmode,
 					 struct drmmode_scanout *scanout);
-extern void drmmode_scanout_free(ScrnInfoPtr scrn);
 void drmmode_crtc_scanout_free(drmmode_crtc_private_ptr drmmode_crtc);
 PixmapPtr drmmode_crtc_scanout_create(xf86CrtcPtr crtc,
 				      struct drmmode_scanout *scanout,
commit c16ff42f927df805619a5255bc383841474daff8
Author: Michel Dänzer <michel.daenzer at amd.com>
Date:   Tue Aug 29 17:06:58 2017 +0900

    Make all active CRTCs scan out an all-black framebuffer in LeaveVT
    
    And destroy all other FBs. This is so that other DRM masters can only
    get access to this all-black FB, not to any other FB we created, while
    we're switched away and not DRM master.
    
    Fixes: b09fde0d81e0 ("Use reference counting for tracking KMS
                          framebuffer lifetimes")
    (Ported from radeon commit 06a465484101f21e99d3a0a62fb03440bcaff93e)
    Reviewed-by: Alex Deucher <alexander.deucher at amd.com>

diff --git a/src/amdgpu_kms.c b/src/amdgpu_kms.c
index e0b7358..c3613eb 100644
--- a/src/amdgpu_kms.c
+++ b/src/amdgpu_kms.c
@@ -32,6 +32,7 @@
 #include <sys/ioctl.h>
 /* Driver data structures */
 #include "amdgpu_drv.h"
+#include "amdgpu_bo_helper.h"
 #include "amdgpu_drm_queue.h"
 #include "amdgpu_glamor.h"
 #include "amdgpu_probe.h"
@@ -1052,11 +1053,10 @@ static void AMDGPUBlockHandler_KMS(BLOCKHANDLER_ARGS_DECL)
 	(*pScreen->BlockHandler) (BLOCKHANDLER_ARGS);
 	pScreen->BlockHandler = AMDGPUBlockHandler_KMS;
 
-	if (!pScrn->vtSema) {
-#if XORG_VERSION_CURRENT < XORG_VERSION_NUMERIC(1,19,0,0,0)
-		if (info->use_glamor)
-			amdgpu_glamor_flush(pScrn);
-#endif
+	if (!xf86ScreenToScrn(amdgpu_master_screen(pScreen))->vtSema) {
+		/* Unreference the all-black FB created by AMDGPULeaveVT_KMS. After
+		 * this, there should be no FB left created by this driver.
+		 */
 
 		for (c = 0; c < xf86_config->num_crtc; c++) {
 			drmmode_crtc_private_ptr drmmode_crtc =
@@ -1967,21 +1967,104 @@ Bool AMDGPUEnterVT_KMS(VT_FUNC_ARGS_DECL)
 	return TRUE;
 }
 
+static void
+pixmap_unref_fb(void *value, XID id, void *cdata)
+{
+	PixmapPtr pixmap = value;
+	AMDGPUEntPtr pAMDGPUEnt = cdata;
+	struct drmmode_fb **fb_ptr = amdgpu_pixmap_get_fb_ptr(pixmap);
+
+	if (fb_ptr)
+		drmmode_fb_reference(pAMDGPUEnt->fd, fb_ptr, NULL);
+}
+
 void AMDGPULeaveVT_KMS(VT_FUNC_ARGS_DECL)
 {
 	SCRN_INFO_PTR(arg);
+	AMDGPUInfoPtr info = AMDGPUPTR(pScrn);
+	AMDGPUEntPtr pAMDGPUEnt = AMDGPUEntPriv(pScrn);
+	ScreenPtr pScreen = pScrn->pScreen;
+	xf86CrtcConfigPtr xf86_config = XF86_CRTC_CONFIG_PTR(pScrn);
+	struct drmmode_scanout black_scanout = { .pixmap = NULL, .bo = NULL };
+	xf86CrtcPtr crtc;
+	drmmode_crtc_private_ptr drmmode_crtc;
+	unsigned w = 0, h = 0;
+	int i;
 
 	xf86DrvMsgVerb(pScrn->scrnIndex, X_INFO, AMDGPU_LOGLEVEL_DEBUG,
 		       "AMDGPULeaveVT_KMS\n");
 
-	amdgpu_drop_drm_master(pScrn);
+	/* Compute maximum scanout dimensions of active CRTCs */
+	for (i = 0; i < xf86_config->num_crtc; i++) {
+		crtc = xf86_config->crtc[i];
+		drmmode_crtc = crtc->driver_private;
+
+		if (!drmmode_crtc->fb)
+			continue;
+
+		w = max(w, crtc->mode.HDisplay);
+		h = max(h, crtc->mode.VDisplay);
+	}
+
+	/* Make all active CRTCs scan out from an all-black framebuffer */
+	if (w > 0 && h > 0) {
+		if (drmmode_crtc_scanout_create(crtc, &black_scanout, w, h)) {
+			struct drmmode_fb *black_fb =
+				amdgpu_pixmap_get_fb(black_scanout.pixmap);
+
+			amdgpu_pixmap_clear(black_scanout.pixmap);
+			amdgpu_glamor_finish(pScrn);
+
+			for (i = 0; i < xf86_config->num_crtc; i++) {
+				crtc = xf86_config->crtc[i];
+				drmmode_crtc = crtc->driver_private;
+
+				if (drmmode_crtc->fb) {
+					if (black_fb) {
+						drmmode_set_mode(crtc, black_fb, &crtc->mode, 0, 0);
+					} else {
+						drmModeSetCrtc(pAMDGPUEnt->fd,
+							       drmmode_crtc->mode_crtc->crtc_id, 0, 0,
+							       0, NULL, 0, NULL);
+						drmmode_fb_reference(pAMDGPUEnt->fd, &drmmode_crtc->fb,
+								     NULL);
+					}
+
+					if (pScrn->is_gpu) {
+						if (drmmode_crtc->scanout[0].pixmap)
+							pixmap_unref_fb(drmmode_crtc->scanout[0].pixmap,
+									None, pAMDGPUEnt);
+						if (drmmode_crtc->scanout[1].pixmap)
+							pixmap_unref_fb(drmmode_crtc->scanout[1].pixmap,
+									None, pAMDGPUEnt);
+					} else {
+						drmmode_crtc_scanout_free(drmmode_crtc);
+					}
+				}
+			}
+		}
+	}
 
 	xf86RotateFreeShadow(pScrn);
-	if (!pScrn->is_gpu)
-		drmmode_scanout_free(pScrn);
+	drmmode_crtc_scanout_destroy(&info->drmmode, &black_scanout);
+
+	/* Unreference FBs of all pixmaps. After this, the only FB remaining
+	 * should be the all-black one being scanned out by active CRTCs
+	 */
+	for (i = 0; i < currentMaxClients; i++) {
+		if (i > 0 &&
+		    (!clients[i] || clients[i]->clientState != ClientStateRunning))
+			continue;
+
+		FindClientResourcesByType(clients[i], RT_PIXMAP, pixmap_unref_fb,
+					  pAMDGPUEnt);
+	}
+	pixmap_unref_fb(pScreen->GetScreenPixmap(pScreen), None, pAMDGPUEnt);
 
 	xf86_hide_cursors(pScrn);
 
+	amdgpu_drop_drm_master(pScrn);
+
 	xf86DrvMsgVerb(pScrn->scrnIndex, X_INFO, AMDGPU_LOGLEVEL_DEBUG,
 		       "Ok, leaving now...\n");
 }
diff --git a/src/drmmode_display.c b/src/drmmode_display.c
index 6092805..6057699 100644
--- a/src/drmmode_display.c
+++ b/src/drmmode_display.c
@@ -478,7 +478,7 @@ drmmode_crtc_scanout_destroy(drmmode_ptr drmmode,
 	}
 }
 
-static void
+void
 drmmode_crtc_scanout_free(drmmode_crtc_private_ptr drmmode_crtc)
 {
 	drmmode_crtc_scanout_destroy(drmmode_crtc->drmmode,
@@ -500,7 +500,7 @@ drmmode_scanout_free(ScrnInfoPtr scrn)
 		drmmode_crtc_scanout_free(xf86_config->crtc[c]->driver_private);
 }
 
-static PixmapPtr
+PixmapPtr
 drmmode_crtc_scanout_create(xf86CrtcPtr crtc, struct drmmode_scanout *scanout,
 			    int width, int height)
 {
diff --git a/src/drmmode_display.h b/src/drmmode_display.h
index 372a539..eff3429 100644
--- a/src/drmmode_display.h
+++ b/src/drmmode_display.h
@@ -209,6 +209,10 @@ extern Bool drmmode_setup_colormap(ScreenPtr pScreen, ScrnInfoPtr pScrn);
 extern void drmmode_crtc_scanout_destroy(drmmode_ptr drmmode,
 					 struct drmmode_scanout *scanout);
 extern void drmmode_scanout_free(ScrnInfoPtr scrn);
+void drmmode_crtc_scanout_free(drmmode_crtc_private_ptr drmmode_crtc);
+PixmapPtr drmmode_crtc_scanout_create(xf86CrtcPtr crtc,
+				      struct drmmode_scanout *scanout,
+				      int width, int height);
 
 extern void drmmode_uevent_init(ScrnInfoPtr scrn, drmmode_ptr drmmode);
 extern void drmmode_uevent_fini(ScrnInfoPtr scrn, drmmode_ptr drmmode);
commit 19672625df0531c12acc05999ea09ea763e5db59
Author: Michel Dänzer <michel.daenzer at amd.com>
Date:   Tue Aug 29 17:05:19 2017 +0900

    Create amdgpu_master_screen helper
    
    Preparatory, no functional change intended yet.
    
    (Ported from radeon commit 7f0cd68d1b0c132e32ae736371bce3e12ed33c7a)
    Reviewed-by: Alex Deucher <alexander.deucher at amd.com>

diff --git a/src/amdgpu_drv.h b/src/amdgpu_drv.h
index 75c2a26..8b378b1 100644
--- a/src/amdgpu_drv.h
+++ b/src/amdgpu_drv.h
@@ -172,6 +172,15 @@ typedef enum {
 #define amdgpu_is_gpu_scrn(scrn) (scrn)->is_gpu
 
 static inline ScreenPtr
+amdgpu_master_screen(ScreenPtr screen)
+{
+	if (screen->current_master)
+		return screen->current_master;
+
+	return screen;
+}
+
+static inline ScreenPtr
 amdgpu_dirty_master(PixmapDirtyUpdatePtr dirty)
 {
 #ifdef HAS_DIRTYTRACKING_DRAWABLE_SRC
@@ -180,10 +189,7 @@ amdgpu_dirty_master(PixmapDirtyUpdatePtr dirty)
 	ScreenPtr screen = dirty->src->drawable.pScreen;
 #endif
 
-	if (screen->current_master)
-		return screen->current_master;
-
-	return screen;
+	return amdgpu_master_screen(screen);
 }
 
 static inline Bool
commit 6b376c8d73b20c92755527edb0527a233886e4eb
Author: Michel Dänzer <michel.daenzer at amd.com>
Date:   Tue Aug 29 16:56:56 2017 +0900

    Create amdgpu_pixmap_get_fb_ptr helper
    
    Preparatory, no functional change intended yet.
    
    Also inline amdgpu_pixmap_create_fb into amdgpu_pixmap_get_fb, since
    there's only one call-site.
    
    (Ported from radeon commit 20f6b56fdb74d88086e8e094013fedbb14e50a24)
    Reviewed-by: Alex Deucher <alexander.deucher at amd.com>

diff --git a/src/amdgpu_pixmap.h b/src/amdgpu_pixmap.h
index 00fb5bf..eded170 100644
--- a/src/amdgpu_pixmap.h
+++ b/src/amdgpu_pixmap.h
@@ -121,39 +121,47 @@ amdgpu_fb_create(int drm_fd, uint32_t width, uint32_t height, uint8_t depth,
 	return NULL;
 }
 
-static inline struct drmmode_fb*
-amdgpu_pixmap_create_fb(int drm_fd, PixmapPtr pix)
+static inline struct drmmode_fb**
+amdgpu_pixmap_get_fb_ptr(PixmapPtr pix)
 {
-	uint32_t handle;
+	ScrnInfoPtr scrn = xf86ScreenToScrn(pix->drawable.pScreen);
+	AMDGPUInfoPtr info = AMDGPUPTR(scrn);
 
-	if (!amdgpu_pixmap_get_handle(pix, &handle))
-		return NULL;
+	if (info->use_glamor) {
+		struct amdgpu_pixmap *priv = amdgpu_get_pixmap_private(pix);
+
+		if (!priv)
+			return NULL;
+
+		return &priv->fb;
+	}
 
-	return amdgpu_fb_create(drm_fd, pix->drawable.width, pix->drawable.height,
-				pix->drawable.depth, pix->drawable.bitsPerPixel,
-				pix->devKind, handle);
+	return NULL;
 }
 
 static inline struct drmmode_fb*
 amdgpu_pixmap_get_fb(PixmapPtr pix)
 {
-	ScrnInfoPtr scrn = xf86ScreenToScrn(pix->drawable.pScreen);
-	AMDGPUEntPtr pAMDGPUEnt = AMDGPUEntPriv(scrn);
-	AMDGPUInfoPtr info = AMDGPUPTR(scrn);
+	struct drmmode_fb **fb_ptr = amdgpu_pixmap_get_fb_ptr(pix);
 
-	if (info->use_glamor) {
-		struct amdgpu_pixmap *priv = amdgpu_get_pixmap_private(pix);
+	if (!fb_ptr)
+		return NULL;
 
-		if (!priv)
-			return NULL;
+	if (!*fb_ptr) {
+		uint32_t handle;
 
-		if (!priv->fb)
-			priv->fb = amdgpu_pixmap_create_fb(pAMDGPUEnt->fd, pix);
+		if (amdgpu_pixmap_get_handle(pix, &handle)) {
+			ScrnInfoPtr scrn = xf86ScreenToScrn(pix->drawable.pScreen);
+			AMDGPUEntPtr pAMDGPUEnt = AMDGPUEntPriv(scrn);
 
-		return priv->fb;
+			*fb_ptr = amdgpu_fb_create(pAMDGPUEnt->fd, pix->drawable.width,
+						   pix->drawable.height, pix->drawable.depth,
+						   pix->drawable.bitsPerPixel, pix->devKind,
+						   handle);
+		}
 	}
 
-	return NULL;
+	return *fb_ptr;
 }
 
 enum {
commit 5af396253f6a03fa3f8f92e81da231dd581b50c9
Author: Michel Dänzer <michel.daenzer at amd.com>
Date:   Tue Aug 29 16:54:10 2017 +0900

    Create drmmode_set_mode helper
    
    Preparatory, no functional change intended yet.
    
    (Ported from radeon commit 4bc992c31059eb50e22df4ebf5b92d08411f41ef)
    Reviewed-by: Alex Deucher <alexander.deucher at amd.com>

diff --git a/src/drmmode_display.c b/src/drmmode_display.c
index 285eb0a..6092805 100644
--- a/src/drmmode_display.c
+++ b/src/drmmode_display.c
@@ -796,6 +796,52 @@ drmmode_crtc_gamma_do_set(xf86CrtcPtr crtc, uint16_t *red, uint16_t *green,
 			    size, red, green, blue);
 }
 
+Bool
+drmmode_set_mode(xf86CrtcPtr crtc, struct drmmode_fb *fb, DisplayModePtr mode,
+		 int x, int y)
+{
+	ScrnInfoPtr scrn = crtc->scrn;
+	AMDGPUEntPtr pAMDGPUEnt = AMDGPUEntPriv(scrn);
+	xf86CrtcConfigPtr xf86_config = XF86_CRTC_CONFIG_PTR(scrn);
+	drmmode_crtc_private_ptr drmmode_crtc = crtc->driver_private;
+	uint32_t *output_ids = calloc(sizeof(uint32_t), xf86_config->num_output);
+	int output_count = 0;
+	drmModeModeInfo kmode;
+	Bool ret;
+	int i;
+
+	if (!output_ids)
+		return FALSE;
+
+	for (i = 0; i < xf86_config->num_output; i++) {
+		xf86OutputPtr output = xf86_config->output[i];
+		drmmode_output_private_ptr drmmode_output = output->driver_private;
+
+		if (output->crtc != crtc)
+			continue;
+
+		output_ids[output_count] = drmmode_output->mode_output->connector_id;
+		output_count++;
+	}
+
+	drmmode_ConvertToKMode(scrn, &kmode, mode);
+
+	ret = drmModeSetCrtc(pAMDGPUEnt->fd,
+			     drmmode_crtc->mode_crtc->crtc_id,
+			     fb->handle, x, y, output_ids,
+			     output_count, &kmode) == 0;
+
+	if (ret) {
+		drmmode_fb_reference(pAMDGPUEnt->fd, &drmmode_crtc->fb, fb);
+	} else {
+		xf86DrvMsg(scrn->scrnIndex, X_ERROR,
+			   "failed to set mode: %s\n", strerror(errno));
+	}
+
+	free(output_ids);
+	return ret;
+}
+
 static Bool
 drmmode_set_mode_major(xf86CrtcPtr crtc, DisplayModePtr mode,
 		       Rotation rotation, int x, int y)
@@ -811,12 +857,9 @@ drmmode_set_mode_major(xf86CrtcPtr crtc, DisplayModePtr mode,
 	int saved_x, saved_y;
 	Rotation saved_rotation;
 	DisplayModeRec saved_mode;
-	uint32_t *output_ids = NULL;
-	int output_count = 0;
 	Bool ret = FALSE;
 	int i;
 	struct drmmode_fb *fb = NULL;
-	drmModeModeInfo kmode;
 
 	/* The root window contents may be undefined before the WindowExposures
 	 * hook is called for it, so bail if we get here before that
@@ -835,23 +878,6 @@ drmmode_set_mode_major(xf86CrtcPtr crtc, DisplayModePtr mode,
 		crtc->y = y;
 		crtc->rotation = rotation;
 
-		output_ids = calloc(sizeof(uint32_t), xf86_config->num_output);
-		if (!output_ids)
-			goto done;
-
-		for (i = 0; i < xf86_config->num_output; i++) {
-			xf86OutputPtr output = xf86_config->output[i];
-			drmmode_output_private_ptr drmmode_output;
-
-			if (output->crtc != crtc)
-				continue;
-
-			drmmode_output = output->driver_private;
-			output_ids[output_count] =
-			    drmmode_output->mode_output->connector_id;
-			output_count++;
-		}
-
 		if (!drmmode_handle_transform(crtc))
 			goto done;
 
@@ -862,8 +888,6 @@ drmmode_set_mode_major(xf86CrtcPtr crtc, DisplayModePtr mode,
 		drmmode_crtc_gamma_do_set(crtc, crtc->gamma_red, crtc->gamma_green,
 					  crtc->gamma_blue, crtc->gamma_size);
 
-		drmmode_ConvertToKMode(crtc->scrn, &kmode, mode);
-
 #ifdef AMDGPU_PIXMAP_SHARING
 		if (drmmode_crtc->prime_scanout_pixmap) {
 			drmmode_crtc_prime_scanout_update(crtc, mode, scanout_id,
@@ -907,17 +931,10 @@ drmmode_set_mode_major(xf86CrtcPtr crtc, DisplayModePtr mode,
 		drmmode_crtc_wait_pending_event(drmmode_crtc, pAMDGPUEnt->fd,
 						drmmode_crtc->flip_pending);
 
-		if (drmModeSetCrtc(pAMDGPUEnt->fd,
-				   drmmode_crtc->mode_crtc->crtc_id,
-				   fb->handle, x, y, output_ids,
-				   output_count, &kmode) != 0) {
-			xf86DrvMsg(crtc->scrn->scrnIndex, X_ERROR,
-				   "failed to set mode: %s\n", strerror(errno));
+		if (!drmmode_set_mode(crtc, fb, mode, x, y))
 			goto done;
-		} else {
-			ret = TRUE;
-			drmmode_fb_reference(pAMDGPUEnt->fd, &drmmode_crtc->fb, fb);
-		}
+
+		ret = TRUE;
 
 		if (pScreen)
 			xf86CrtcSetScreenSubpixelOrder(pScreen);
@@ -954,7 +971,6 @@ drmmode_set_mode_major(xf86CrtcPtr crtc, DisplayModePtr mode,
 #endif
 
 done:
-	free(output_ids);
 	if (!ret) {
 		crtc->x = saved_x;
 		crtc->y = saved_y;
diff --git a/src/drmmode_display.h b/src/drmmode_display.h
index 1a6454c..372a539 100644
--- a/src/drmmode_display.h
+++ b/src/drmmode_display.h
@@ -213,6 +213,9 @@ extern void drmmode_scanout_free(ScrnInfoPtr scrn);
 extern void drmmode_uevent_init(ScrnInfoPtr scrn, drmmode_ptr drmmode);
 extern void drmmode_uevent_fini(ScrnInfoPtr scrn, drmmode_ptr drmmode);
 
+Bool drmmode_set_mode(xf86CrtcPtr crtc, struct drmmode_fb *fb,
+		      DisplayModePtr mode, int x, int y);
+
 extern int drmmode_get_crtc_id(xf86CrtcPtr crtc);
 extern int drmmode_get_pitch_align(ScrnInfoPtr scrn, int bpe);
 Bool amdgpu_do_pageflip(ScrnInfoPtr scrn, ClientPtr client,
commit 1afd4a526c97e77ec882988e35d4977880b9d16c
Author: Michel Dänzer <michel.daenzer at amd.com>
Date:   Tue Aug 29 16:46:33 2017 +0900

    Create amdgpu_pixmap_clear helper
    
    Preparatory, no functional change intended yet.
    
    (Ported from radeon commit 3f6210ca2c8ef60d59efc8139151d3b9838bb875)
    Reviewed-by: Alex Deucher <alexander.deucher at amd.com>

diff --git a/src/amdgpu_bo_helper.c b/src/amdgpu_bo_helper.c
index 7acd005..ee52e0c 100644
--- a/src/amdgpu_bo_helper.c
+++ b/src/amdgpu_bo_helper.c
@@ -120,6 +120,26 @@ struct amdgpu_buffer *amdgpu_alloc_pixmap_bo(ScrnInfoPtr pScrn, int width,
 	return pixmap_buffer;
 }
 
+/* Clear the pixmap contents to black */
+void
+amdgpu_pixmap_clear(PixmapPtr pixmap)
+{
+	ScreenPtr screen = pixmap->drawable.pScreen;
+	AMDGPUInfoPtr info = AMDGPUPTR(xf86ScreenToScrn(screen));
+	GCPtr gc = GetScratchGC(pixmap->drawable.depth, screen);
+	xRectangle rect;
+
+	ValidateGC(&pixmap->drawable, gc);
+	rect.x = 0;
+	rect.y = 0;
+	rect.width = pixmap->drawable.width;
+	rect.height = pixmap->drawable.height;
+	info->force_accel = TRUE;
+	gc->ops->PolyFillRect(&pixmap->drawable, gc, 1, &rect);
+	info->force_accel = FALSE;
+	FreeScratchGC(gc);
+}
+
 Bool amdgpu_bo_get_handle(struct amdgpu_buffer *bo, uint32_t *handle)
 {
 	if (bo->flags & AMDGPU_BO_FLAGS_GBM) {
diff --git a/src/amdgpu_bo_helper.h b/src/amdgpu_bo_helper.h
index 26fca16..4f6b628 100644
--- a/src/amdgpu_bo_helper.h
+++ b/src/amdgpu_bo_helper.h
@@ -29,6 +29,8 @@ extern struct amdgpu_buffer *amdgpu_alloc_pixmap_bo(ScrnInfoPtr pScrn, int width
 						     int height, int depth, int usage_hint,
 						     int bitsPerPixel, int *new_pitch);
 
+extern void amdgpu_pixmap_clear(PixmapPtr pixmap);
+
 extern Bool amdgpu_bo_get_handle(struct amdgpu_buffer *bo, uint32_t *handle);
 
 extern uint64_t amdgpu_pixmap_get_tiling_info(PixmapPtr pixmap);
diff --git a/src/drmmode_display.c b/src/drmmode_display.c
index 17efde8..285eb0a 100644
--- a/src/drmmode_display.c
+++ b/src/drmmode_display.c
@@ -2116,8 +2116,6 @@ static Bool drmmode_xf86crtc_resize(ScrnInfoPtr scrn, int width, int height)
 	PixmapPtr ppix = screen->GetScreenPixmap(screen);
 	void *fb_shadow;
 	int hint = 0;
-	xRectangle rect;
-	GCPtr gc;
 
 	if (scrn->virtualX == width && scrn->virtualY == height)
 		return TRUE;
@@ -2181,17 +2179,7 @@ static Bool drmmode_xf86crtc_resize(ScrnInfoPtr scrn, int width, int height)
 			goto fail;
 	}
 
-	/* Clear new buffer */
-	gc = GetScratchGC(ppix->drawable.depth, scrn->pScreen);
-	ValidateGC(&ppix->drawable, gc);
-	rect.x = 0;
-	rect.y = 0;
-	rect.width = width;
-	rect.height = height;
-	info->force_accel = TRUE;
-	(*gc->ops->PolyFillRect)(&ppix->drawable, gc, 1, &rect);
-	info->force_accel = FALSE;
-	FreeScratchGC(gc);
+	amdgpu_pixmap_clear(ppix);
 	amdgpu_glamor_finish(scrn);
 
 	for (i = 0; i < xf86_config->num_crtc; i++) {


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