From: Wei Hu <weh@microsoft.com>

Date: Wed, 18 Sep 2019 06:03:20 +0000

Patch-mainline: v5.5-rc1

References: bsc#1175306

Subject: video: hyperv: hyperv_fb: Support deferred IO for Hyper-V frame buffer driver

Git-commit: d21987d709e807ba7bbf47044deb56a3c02e8be4

Without deferred IO support, hyperv_fb driver informs the host to refresh

the entire guest frame buffer at fixed rate, e.g. at 20Hz, no matter there

is screen update or not. This patch supports deferred IO for screens in

graphics mode and also enables the frame buffer on-demand refresh. The

highest refresh rate is still set at 20Hz.

Currently Hyper-V only takes a physical address from guest as the starting

address of frame buffer. This implies the guest must allocate contiguous

physical memory for frame buffer. In addition, Hyper-V Gen 2 VMs only

accept address from MMIO region as frame buffer address. Due to these

limitations on Hyper-V host, we keep a shadow copy of frame buffer

in the guest. This means one more copy of the dirty rectangle inside

guest when doing the on-demand refresh. This can be optimized in the

future with help from host. For now the host performance gain from deferred

IO outweighs the shadow copy impact in the guest.

Signed-off-by: Wei Hu <weh@microsoft.com>

Reviewed-by: Dexuan Cui <decui@microsoft.com>

Reviewed-by: Michael Kelley <mikelley@microsoft.com>

Signed-off-by: Sasha Levin <sashal@kernel.org>

Acked-by: Olaf Hering <ohering@suse.de>

Acked-by: Thomas Zimmermann <tzimmermann@suse.de>

---

 drivers/video/fbdev/Kconfig     |   1 +

 drivers/video/fbdev/hyperv_fb.c | 210 ++++++++++++++++++++++++++++++++++++----

 2 files changed, 190 insertions(+), 21 deletions(-)

diff --git a/drivers/video/fbdev/Kconfig b/drivers/video/fbdev/Kconfig

--- a/drivers/video/fbdev/Kconfig

+++ b/drivers/video/fbdev/Kconfig

@@ -2214,6 +2214,7 @@ config FB_HYPERV

 	select FB_CFB_FILLRECT

 	select FB_CFB_COPYAREA

 	select FB_CFB_IMAGEBLIT

+	select FB_DEFERRED_IO

 	help

 	  This framebuffer driver supports Microsoft Hyper-V Synthetic Video.

diff --git a/drivers/video/fbdev/hyperv_fb.c b/drivers/video/fbdev/hyperv_fb.c

--- a/drivers/video/fbdev/hyperv_fb.c

+++ b/drivers/video/fbdev/hyperv_fb.c

@@ -238,6 +238,7 @@ struct synthvid_msg {

 #define RING_BUFSIZE (256 * 1024)

 #define VSP_TIMEOUT (10 * HZ)

 #define HVFB_UPDATE_DELAY (HZ / 20)

+#define HVFB_ONDEMAND_THROTTLE (HZ / 20)

 struct hvfb_par {

 	struct fb_info *info;

@@ -258,6 +259,16 @@ struct hvfb_par {

 	bool synchronous_fb;

 	struct notifier_block hvfb_panic_nb;

+

+	/* Memory for deferred IO and frame buffer itself */

+	unsigned char *dio_vp;

+	unsigned char *mmio_vp;

+	unsigned long mmio_pp;

+

+	/* Dirty rectangle, protected by delayed_refresh_lock */

+	int x1, y1, x2, y2;

+	bool delayed_refresh;

+	spinlock_t delayed_refresh_lock;

 };

 static uint screen_width = HVFB_WIDTH;

@@ -266,6 +277,7 @@ static uint screen_width_max = HVFB_WIDTH;

 static uint screen_height_max = HVFB_HEIGHT;

 static uint screen_depth;

 static uint screen_fb_size;

+static uint dio_fb_size; /* FB size for deferred IO */

 /* Send message to Hyper-V host */

 static inline int synthvid_send(struct hv_device *hdev,

@@ -352,28 +364,88 @@ static int synthvid_send_ptr(struct hv_device *hdev)

 }

 /* Send updated screen area (dirty rectangle) location to host */

-static int synthvid_update(struct fb_info *info)

+static int

+synthvid_update(struct fb_info *info, int x1, int y1, int x2, int y2)

 {

 	struct hv_device *hdev = device_to_hv_device(info->device);

 	struct synthvid_msg msg;

 	memset(&msg, 0, sizeof(struct synthvid_msg));

+	if (x2 == INT_MAX)

+		x2 = info->var.xres;

+	if (y2 == INT_MAX)

+		y2 = info->var.yres;

 	msg.vid_hdr.type = SYNTHVID_DIRT;

 	msg.vid_hdr.size = sizeof(struct synthvid_msg_hdr) +

 		sizeof(struct synthvid_dirt);

 	msg.dirt.video_output = 0;

 	msg.dirt.dirt_count = 1;

-	msg.dirt.rect[0].x1 = 0;

-	msg.dirt.rect[0].y1 = 0;

-	msg.dirt.rect[0].x2 = info->var.xres;

-	msg.dirt.rect[0].y2 = info->var.yres;

+	msg.dirt.rect[0].x1 = (x1 > x2) ? 0 : x1;

+	msg.dirt.rect[0].y1 = (y1 > y2) ? 0 : y1;

+	msg.dirt.rect[0].x2 =

+		(x2 < x1 || x2 > info->var.xres) ? info->var.xres : x2;

+	msg.dirt.rect[0].y2 =

+		(y2 < y1 || y2 > info->var.yres) ? info->var.yres : y2;

 	synthvid_send(hdev, &msg;;

 	return 0;

 }

+static void hvfb_docopy(struct hvfb_par *par,

+			unsigned long offset,

+			unsigned long size)

+{

+	if (!par || !par->mmio_vp || !par->dio_vp || !par->fb_ready ||

+	    size == 0 || offset >= dio_fb_size)

+		return;

+

+	if (offset + size > dio_fb_size)

+		size = dio_fb_size - offset;

+

+	memcpy(par->mmio_vp + offset, par->dio_vp + offset, size);

+}

+

+/* Deferred IO callback */

+static void synthvid_deferred_io(struct fb_info *p,

+				 struct list_head *pagelist)

+{

+	struct hvfb_par *par = p->par;

+	struct page *page;

+	unsigned long start, end;

+	int y1, y2, miny, maxy;

+

+	miny = INT_MAX;

+	maxy = 0;

+

+	/*

+	 * Merge dirty pages. It is possible that last page cross

+	 * over the end of frame buffer row yres. This is taken care of

+	 * in synthvid_update function by clamping the y2

+	 * value to yres.

+	 */

+	list_for_each_entry(page, pagelist, lru) {

+		start = page->index << PAGE_SHIFT;

+		end = start + PAGE_SIZE - 1;

+		y1 = start / p->fix.line_length;

+		y2 = end / p->fix.line_length;

+		miny = min_t(int, miny, y1);

+		maxy = max_t(int, maxy, y2);

+

+		/* Copy from dio space to mmio address */

+		if (par->fb_ready)

+			hvfb_docopy(par, start, PAGE_SIZE);

+	}

+

+	if (par->fb_ready && par->update)

+		synthvid_update(p, 0, miny, p->var.xres, maxy + 1);

+}

+

+static struct fb_deferred_io synthvid_defio = {

+	.delay		= HZ / 20,

+	.deferred_io	= synthvid_deferred_io,

+};

 /*

  * Actions on received messages from host:

@@ -620,7 +692,7 @@ static int synthvid_send_config(struct hv_device *hdev)

 	msg->vid_hdr.type = SYNTHVID_VRAM_LOCATION;

 	msg->vid_hdr.size = sizeof(struct synthvid_msg_hdr) +

 		sizeof(struct synthvid_vram_location);

-	msg->vram.user_ctx = msg->vram.vram_gpa = info->fix.smem_start;

+	msg->vram.user_ctx = msg->vram.vram_gpa = par->mmio_pp;

 	msg->vram.is_vram_gpa_specified = 1;

 	synthvid_send(hdev, msg);

@@ -630,7 +702,7 @@ static int synthvid_send_config(struct hv_device *hdev)

 		ret = -ETIMEDOUT;

 		goto out;

 	}

-	if (msg->vram_ack.user_ctx != info->fix.smem_start) {

+	if (msg->vram_ack.user_ctx != par->mmio_pp) {

 		pr_err("Unable to set VRAM location\n");

 		ret = -ENODEV;

 		goto out;

@@ -647,19 +719,77 @@ out:

 /*

  * Delayed work callback:

- * It is called at HVFB_UPDATE_DELAY or longer time interval to process

- * screen updates. It is re-scheduled if further update is necessary.

+ * It is scheduled to call whenever update request is received and it has

+ * not been called in last HVFB_ONDEMAND_THROTTLE time interval.

  */

 static void hvfb_update_work(struct work_struct *w)

 {

 	struct hvfb_par *par = container_of(w, struct hvfb_par, dwork.work);

 	struct fb_info *info = par->info;

+	unsigned long flags;

+	int x1, x2, y1, y2;

+	int j;

+

+	spin_lock_irqsave(&par->delayed_refresh_lock, flags);

+	/* Reset the request flag */

+	par->delayed_refresh = false;

+

+	/* Store the dirty rectangle to local variables */

+	x1 = par->x1;

+	x2 = par->x2;

+	y1 = par->y1;

+	y2 = par->y2;

+

+	/* Clear dirty rectangle */

+	par->x1 = par->y1 = INT_MAX;

+	par->x2 = par->y2 = 0;

+

+	spin_unlock_irqrestore(&par->delayed_refresh_lock, flags);

+

+	if (x1 > info->var.xres || x2 > info->var.xres ||

+	    y1 > info->var.yres || y2 > info->var.yres || x2 <= x1)

+		return;

+

+	/* Copy the dirty rectangle to frame buffer memory */

+	for (j = y1; j < y2; j++) {

+		hvfb_docopy(par,

+			    j * info->fix.line_length +

+			    (x1 * screen_depth / 8),

+			    (x2 - x1) * screen_depth / 8);

+	}

+

+	/* Refresh */

+	if (par->fb_ready && par->update)

+		synthvid_update(info, x1, y1, x2, y2);

+}

-	if (par->fb_ready)

-		synthvid_update(info);

+/*

+ * Control the on-demand refresh frequency. It schedules a delayed

+ * screen update if it has not yet.

+ */

+static void hvfb_ondemand_refresh_throttle(struct hvfb_par *par,

+					   int x1, int y1, int w, int h)

+{

+	unsigned long flags;

+	int x2 = x1 + w;

+	int y2 = y1 + h;

+

+	spin_lock_irqsave(&par->delayed_refresh_lock, flags);

+

+	/* Merge dirty rectangle */

+	par->x1 = min_t(int, par->x1, x1);

+	par->y1 = min_t(int, par->y1, y1);

+	par->x2 = max_t(int, par->x2, x2);

+	par->y2 = max_t(int, par->y2, y2);

+

+	/* Schedule a delayed screen update if not yet */

+	if (par->delayed_refresh == false) {

+		schedule_delayed_work(&par->dwork,

+				      HVFB_ONDEMAND_THROTTLE);

+		par->delayed_refresh = true;

+	}

-	if (par->update)

-		schedule_delayed_work(&par->dwork, HVFB_UPDATE_DELAY);

+	spin_unlock_irqrestore(&par->delayed_refresh_lock, flags);

 }

 static int hvfb_on_panic(struct notifier_block *nb,

@@ -671,7 +801,8 @@ static int hvfb_on_panic(struct notifier_block *nb,

 	par = container_of(nb, struct hvfb_par, hvfb_panic_nb);

 	par->synchronous_fb = true;

 	info = par->info;

-	synthvid_update(info);

+	hvfb_docopy(par, 0, dio_fb_size);

+	synthvid_update(info, 0, 0, INT_MAX, INT_MAX);

 	return NOTIFY_DONE;

 }

@@ -732,7 +863,10 @@ static void hvfb_cfb_fillrect(struct fb_info *p,

 	cfb_fillrect(p, rect);

 	if (par->synchronous_fb)

-		synthvid_update(p);

+		synthvid_update(p, 0, 0, INT_MAX, INT_MAX);

+	else

+		hvfb_ondemand_refresh_throttle(par, rect->dx, rect->dy,

+					       rect->width, rect->height);

 }

 static void hvfb_cfb_copyarea(struct fb_info *p,

@@ -742,7 +876,10 @@ static void hvfb_cfb_copyarea(struct fb_info *p,

 	cfb_copyarea(p, area);

 	if (par->synchronous_fb)

-		synthvid_update(p);

+		synthvid_update(p, 0, 0, INT_MAX, INT_MAX);

+	else

+		hvfb_ondemand_refresh_throttle(par, area->dx, area->dy,

+					       area->width, area->height);

 }

 static void hvfb_cfb_imageblit(struct fb_info *p,

@@ -752,7 +889,10 @@ static void hvfb_cfb_imageblit(struct fb_info *p,

 	cfb_imageblit(p, image);

 	if (par->synchronous_fb)

-		synthvid_update(p);

+		synthvid_update(p, 0, 0, INT_MAX, INT_MAX);

+	else

+		hvfb_ondemand_refresh_throttle(par, image->dx, image->dy,

+					       image->width, image->height);

 }

 static struct fb_ops hvfb_ops = {

@@ -811,6 +951,9 @@ static int hvfb_getmem(struct hv_device *hdev, struct fb_info *info)

 	resource_size_t pot_start, pot_end;

 	int ret;

+	dio_fb_size =

+		screen_width * screen_height * screen_depth / 8;

+

 	if (gen2vm) {

 		pot_start = 0;

 		pot_end = -1;

@@ -845,9 +988,14 @@ static int hvfb_getmem(struct hv_device *hdev, struct fb_info *info)

 	if (!fb_virt)

 		goto err2;

+	/* Allocate memory for deferred IO */

+	par->dio_vp = vzalloc(round_up(dio_fb_size, PAGE_SIZE));

+	if (par->dio_vp == NULL)

+		goto err3;

+

 	info->apertures = alloc_apertures(1);

 	if (!info->apertures)

-		goto err3;

+		goto err4;

 	if (gen2vm) {

 		info->apertures->ranges[0].base = screen_info.lfb_base;

@@ -859,16 +1007,23 @@ static int hvfb_getmem(struct hv_device *hdev, struct fb_info *info)

 		info->apertures->ranges[0].size = pci_resource_len(pdev, 0);

 	}

+	/* Physical address of FB device */

+	par->mmio_pp = par->mem->start;

+	/* Virtual address of FB device */

+	par->mmio_vp = (unsigned char *) fb_virt;

+

 	info->fix.smem_start = par->mem->start;

-	info->fix.smem_len = screen_fb_size;

-	info->screen_base = fb_virt;

-	info->screen_size = screen_fb_size;

+	info->fix.smem_len = dio_fb_size;

+	info->screen_base = par->dio_vp;

+	info->screen_size = dio_fb_size;

 	if (!gen2vm)

 		pci_dev_put(pdev);

 	return 0;

+err4:

+	vfree(par->dio_vp);

 err3:

 	iounmap(fb_virt);

 err2:

@@ -886,6 +1041,7 @@ static void hvfb_putmem(struct fb_info *info)

 {

 	struct hvfb_par *par = info->par;

+	vfree(par->dio_vp);

 	iounmap(info->screen_base);

 	vmbus_free_mmio(par->mem->start, screen_fb_size);

 	par->mem = NULL;

@@ -909,6 +1065,11 @@ static int hvfb_probe(struct hv_device *hdev,

 	init_completion(&par->wait);

 	INIT_DELAYED_WORK(&par->dwork, hvfb_update_work);

+	par->delayed_refresh = false;

+	spin_lock_init(&par->delayed_refresh_lock);

+	par->x1 = par->y1 = INT_MAX;

+	par->x2 = par->y2 = 0;

+

 	/* Connect to VSP */

 	hv_set_drvdata(hdev, info);

 	ret = synthvid_connect_vsp(hdev);

@@ -960,6 +1121,10 @@ static int hvfb_probe(struct hv_device *hdev,

 	info->fbops = &hvfb_ops;

 	info->pseudo_palette = par->pseudo_palette;

+	/* Initialize deferred IO */

+	info->fbdefio = &synthvid_defio;

+	fb_deferred_io_init(info);

+

 	/* Send config to host */

 	ret = synthvid_send_config(hdev);

 	if (ret)

@@ -981,6 +1146,7 @@ static int hvfb_probe(struct hv_device *hdev,

 	return 0;

 error:

+	fb_deferred_io_cleanup(info);

 	hvfb_putmem(info);

 error2:

 	vmbus_close(hdev->channel);

@@ -1003,6 +1169,8 @@ static int hvfb_remove(struct hv_device *hdev)

 	par->update = false;

 	par->fb_ready = false;

+	fb_deferred_io_cleanup(info);

+

 	unregister_framebuffer(info);

 	cancel_delayed_work_sync(&par->dwork);