From 34ff636f322c6d5e4f0a52338fa63a7dff09a495 Mon Sep 17 00:00:00 2001
From: Joel Fernandes <joelagnelf@nvidia.com>
Date: Sat, 18 Jul 2026 13:15:36 -0400
Subject: scftorture: Count single_rpc offline failures in statistics output

scf_torture_stats_print() aggregates each invoker thread's counters
into a local scf_statistics structure before printing, but the
n_single_rpc_ofl field is missing from the aggregation loop.  As a
result, the "single_rpc_ofl" value printed in the statistics line is
always zero, even when smp_call_function_single() invocations for the
RPC test have failed due to offline CPUs and been counted by the
invoker threads.

Add the missing accumulation so that the printed value reflects the
actual counts.

Signed-off-by: Joel Fernandes <joelagnelf@nvidia.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
---
 drivers/video/fbdev/hecubafb.c | 251 +++++++++++++++++++++++++++++++++++++++++
 1 file changed, 251 insertions(+)
 create mode 100644 drivers/video/fbdev/hecubafb.c

(limited to 'drivers/video/fbdev/hecubafb.c')

diff --git a/drivers/video/fbdev/hecubafb.c b/drivers/video/fbdev/hecubafb.c
new file mode 100644
index 000000000..dd2af980f
--- /dev/null
+++ b/drivers/video/fbdev/hecubafb.c
@@ -0,0 +1,251 @@
+/*
+ * linux/drivers/video/hecubafb.c -- FB driver for Hecuba/Apollo controller
+ *
+ * Copyright (C) 2006, Jaya Kumar
+ * This work was sponsored by CIS(M) Sdn Bhd
+ *
+ * This file is subject to the terms and conditions of the GNU General Public
+ * License. See the file COPYING in the main directory of this archive for
+ * more details.
+ *
+ * Layout is based on skeletonfb.c by James Simmons and Geert Uytterhoeven.
+ * This work was possible because of apollo display code from E-Ink's website
+ * http://support.eink.com/community
+ * All information used to write this code is from public material made
+ * available by E-Ink on its support site. Some commands such as 0xA4
+ * were found by looping through cmd=0x00 thru 0xFF and supplying random
+ * values. There are other commands that the display is capable of,
+ * beyond the 5 used here but they are more complex.
+ *
+ * This driver is written to be used with the Hecuba display architecture.
+ * The actual display chip is called Apollo and the interface electronics
+ * it needs is called Hecuba.
+ *
+ * It is intended to be architecture independent. A board specific driver
+ * must be used to perform all the physical IO interactions. An example
+ * is provided as n411.c
+ *
+ */
+
+#include <linux/module.h>
+#include <linux/kernel.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/mm.h>
+#include <linux/vmalloc.h>
+#include <linux/delay.h>
+#include <linux/interrupt.h>
+#include <linux/fb.h>
+#include <linux/init.h>
+#include <linux/platform_device.h>
+#include <linux/list.h>
+#include <linux/uaccess.h>
+
+#include <video/hecubafb.h>
+
+/* Display specific information */
+#define DPY_W 600
+#define DPY_H 800
+
+static const struct fb_fix_screeninfo hecubafb_fix = {
+	.id =		"hecubafb",
+	.type =		FB_TYPE_PACKED_PIXELS,
+	.visual =	FB_VISUAL_MONO01,
+	.xpanstep =	0,
+	.ypanstep =	0,
+	.ywrapstep =	0,
+	.line_length =	DPY_W,
+	.accel =	FB_ACCEL_NONE,
+};
+
+static const struct fb_var_screeninfo hecubafb_var = {
+	.xres		= DPY_W,
+	.yres		= DPY_H,
+	.xres_virtual	= DPY_W,
+	.yres_virtual	= DPY_H,
+	.bits_per_pixel	= 1,
+	.nonstd		= 1,
+};
+
+/* main hecubafb functions */
+
+static void apollo_send_data(struct hecubafb_par *par, unsigned char data)
+{
+	/* set data */
+	par->board->set_data(par, data);
+
+	/* set DS low */
+	par->board->set_ctl(par, HCB_DS_BIT, 0);
+
+	/* wait for ack */
+	par->board->wait_for_ack(par, 0);
+
+	/* set DS hi */
+	par->board->set_ctl(par, HCB_DS_BIT, 1);
+
+	/* wait for ack to clear */
+	par->board->wait_for_ack(par, 1);
+}
+
+static void apollo_send_command(struct hecubafb_par *par, unsigned char data)
+{
+	/* command so set CD to high */
+	par->board->set_ctl(par, HCB_CD_BIT, 1);
+
+	/* actually strobe with command */
+	apollo_send_data(par, data);
+
+	/* clear CD back to low */
+	par->board->set_ctl(par, HCB_CD_BIT, 0);
+}
+
+static void hecubafb_dpy_update(struct hecubafb_par *par)
+{
+	int i;
+	unsigned char *buf = par->info->screen_buffer;
+
+	apollo_send_command(par, APOLLO_START_NEW_IMG);
+
+	for (i=0; i < (DPY_W*DPY_H/8); i++) {
+		apollo_send_data(par, *(buf++));
+	}
+
+	apollo_send_command(par, APOLLO_STOP_IMG_DATA);
+	apollo_send_command(par, APOLLO_DISPLAY_IMG);
+}
+
+/* this is called back from the deferred io workqueue */
+static void hecubafb_dpy_deferred_io(struct fb_info *info, struct list_head *pagereflist)
+{
+	hecubafb_dpy_update(info->par);
+}
+
+static void hecubafb_defio_damage_range(struct fb_info *info, off_t off, size_t len)
+{
+	struct hecubafb_par *par = info->par;
+
+	hecubafb_dpy_update(par);
+}
+
+static void hecubafb_defio_damage_area(struct fb_info *info, u32 x, u32 y,
+				       u32 width, u32 height)
+{
+	struct hecubafb_par *par = info->par;
+
+	hecubafb_dpy_update(par);
+}
+
+FB_GEN_DEFAULT_DEFERRED_SYSMEM_OPS(hecubafb,
+				   hecubafb_defio_damage_range,
+				   hecubafb_defio_damage_area)
+
+static const struct fb_ops hecubafb_ops = {
+	.owner	= THIS_MODULE,
+	FB_DEFAULT_DEFERRED_OPS(hecubafb),
+};
+
+static struct fb_deferred_io hecubafb_defio = {
+	.delay		= HZ,
+	.deferred_io	= hecubafb_dpy_deferred_io,
+};
+
+static int hecubafb_probe(struct platform_device *dev)
+{
+	struct fb_info *info;
+	struct hecuba_board *board;
+	int retval = -ENOMEM;
+	int videomemorysize;
+	unsigned char *videomemory;
+	struct hecubafb_par *par;
+
+	/* pick up board specific routines */
+	board = dev->dev.platform_data;
+	if (!board)
+		return -EINVAL;
+
+	/* try to count device specific driver, if can't, platform recalls */
+	if (!try_module_get(board->owner))
+		return -ENODEV;
+
+	videomemorysize = (DPY_W*DPY_H)/8;
+
+	videomemory = vzalloc(videomemorysize);
+	if (!videomemory)
+		goto err_videomem_alloc;
+
+	info = framebuffer_alloc(sizeof(struct hecubafb_par), &dev->dev);
+	if (!info)
+		goto err_fballoc;
+
+	info->screen_buffer = videomemory;
+	info->fbops = &hecubafb_ops;
+
+	info->var = hecubafb_var;
+	info->fix = hecubafb_fix;
+	info->fix.smem_len = videomemorysize;
+	par = info->par;
+	par->info = info;
+	par->board = board;
+	par->send_command = apollo_send_command;
+	par->send_data = apollo_send_data;
+
+	info->flags = FBINFO_VIRTFB;
+
+	info->fbdefio = &hecubafb_defio;
+	retval = fb_deferred_io_init(info);
+	if (retval)
+		goto err_fbdefio;
+
+	retval = register_framebuffer(info);
+	if (retval < 0)
+		goto err_fbreg;
+	platform_set_drvdata(dev, info);
+
+	fb_info(info, "Hecuba frame buffer device, using %dK of video memory\n",
+		videomemorysize >> 10);
+
+	/* this inits the dpy */
+	retval = par->board->init(par);
+	if (retval < 0)
+		goto err_fbreg;
+
+	return 0;
+err_fbreg:
+	fb_deferred_io_cleanup(info);
+err_fbdefio:
+	framebuffer_release(info);
+err_fballoc:
+	vfree(videomemory);
+err_videomem_alloc:
+	module_put(board->owner);
+	return retval;
+}
+
+static void hecubafb_remove(struct platform_device *dev)
+{
+	struct fb_info *info = platform_get_drvdata(dev);
+
+	if (info) {
+		struct hecubafb_par *par = info->par;
+		fb_deferred_io_cleanup(info);
+		unregister_framebuffer(info);
+		vfree(info->screen_buffer);
+		if (par->board->remove)
+			par->board->remove(par);
+		module_put(par->board->owner);
+		framebuffer_release(info);
+	}
+}
+
+static struct platform_driver hecubafb_driver = {
+	.probe	= hecubafb_probe,
+	.remove	= hecubafb_remove,
+	.driver	= {
+		.name	= "hecubafb",
+	},
+};
+module_platform_driver(hecubafb_driver);
+
+MODULE_DESCRIPTION("fbdev driver for Hecuba/Apollo controller");
+MODULE_AUTHOR("Jaya Kumar");
+MODULE_LICENSE("GPL");
-- 
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