Merge drm/drm-next into drm-intel-next-queued

Some DSI and VBT pending patches from Hans will apply
cleanly and with less ugly conflicts if they are rebuilt
on top of other patches that recently landed on drm-next.

Reference: https://patchwork.freedesktop.org/series/70952/
Cc: Hans de Goede <hdegoede@redhat.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com

1 files changed, 263 insertions, 27 deletions

diff --git a/init/main.c b/init/main.c
index da1bc0b60a7d..f95b014a5479 100644
--- a/init/main.c
+++ b/init/main.c
@@ -28,6 +28,7 @@
 #include <linux/initrd.h>
 #include <linux/memblock.h>
 #include <linux/acpi.h>
+#include <linux/bootconfig.h>
 #include <linux/console.h>
 #include <linux/nmi.h>
 #include <linux/percpu.h>
@@ -63,7 +64,7 @@
 #include <linux/lockdep.h>
 #include <linux/kmemleak.h>
 #include <linux/pid_namespace.h>
-#include <linux/device.h>
+#include <linux/device/driver.h>
 #include <linux/kthread.h>
 #include <linux/sched.h>
 #include <linux/sched/init.h>
@@ -136,8 +137,19 @@ char __initdata boot_command_line[COMMAND_LINE_SIZE];
 char *saved_command_line;
 /* Command line for parameter parsing */
 static char *static_command_line;
-/* Command line for per-initcall parameter parsing */
-static char *initcall_command_line;
+/* Untouched extra command line */
+static char *extra_command_line;
+/* Extra init arguments */
+static char *extra_init_args;
+
+#ifdef CONFIG_BOOT_CONFIG
+/* Is bootconfig on command line? */
+static bool bootconfig_found;
+static bool initargs_found;
+#else
+# define bootconfig_found false
+# define initargs_found false
+#endif
 
 static char *execute_command;
 static char *ramdisk_execute_command;
@@ -245,10 +257,172 @@ static int __init loglevel(char *str)
 
 early_param("loglevel", loglevel);
 
-/* Change NUL term back to "=", to make "param" the whole string. */
-static int __init repair_env_string(char *param, char *val,
+#ifdef CONFIG_BOOT_CONFIG
+
+char xbc_namebuf[XBC_KEYLEN_MAX] __initdata;
+
+#define rest(dst, end) ((end) > (dst) ? (end) - (dst) : 0)
+
+static int __init xbc_snprint_cmdline(char *buf, size_t size,
+				      struct xbc_node *root)
+{
+	struct xbc_node *knode, *vnode;
+	char *end = buf + size;
+	char c = '\"';
+	const char *val;
+	int ret;
+
+	xbc_node_for_each_key_value(root, knode, val) {
+		ret = xbc_node_compose_key_after(root, knode,
+					xbc_namebuf, XBC_KEYLEN_MAX);
+		if (ret < 0)
+			return ret;
+
+		vnode = xbc_node_get_child(knode);
+		ret = snprintf(buf, rest(buf, end), "%s%c", xbc_namebuf,
+				vnode ? '=' : ' ');
+		if (ret < 0)
+			return ret;
+		buf += ret;
+		if (!vnode)
+			continue;
+
+		c = '\"';
+		xbc_array_for_each_value(vnode, val) {
+			ret = snprintf(buf, rest(buf, end), "%c%s", c, val);
+			if (ret < 0)
+				return ret;
+			buf += ret;
+			c = ',';
+		}
+		if (rest(buf, end) > 2)
+			strcpy(buf, "\" ");
+		buf += 2;
+	}
+
+	return buf - (end - size);
+}
+#undef rest
+
+/* Make an extra command line under given key word */
+static char * __init xbc_make_cmdline(const char *key)
+{
+	struct xbc_node *root;
+	char *new_cmdline;
+	int ret, len = 0;
+
+	root = xbc_find_node(key);
+	if (!root)
+		return NULL;
+
+	/* Count required buffer size */
+	len = xbc_snprint_cmdline(NULL, 0, root);
+	if (len <= 0)
+		return NULL;
+
+	new_cmdline = memblock_alloc(len + 1, SMP_CACHE_BYTES);
+	if (!new_cmdline) {
+		pr_err("Failed to allocate memory for extra kernel cmdline.\n");
+		return NULL;
+	}
+
+	ret = xbc_snprint_cmdline(new_cmdline, len + 1, root);
+	if (ret < 0 || ret > len) {
+		pr_err("Failed to print extra kernel cmdline.\n");
+		return NULL;
+	}
+
+	return new_cmdline;
+}
+
+u32 boot_config_checksum(unsigned char *p, u32 size)
+{
+	u32 ret = 0;
+
+	while (size--)
+		ret += *p++;
+
+	return ret;
+}
+
+static int __init bootconfig_params(char *param, char *val,
 				    const char *unused, void *arg)
 {
+	if (strcmp(param, "bootconfig") == 0) {
+		bootconfig_found = true;
+	} else if (strcmp(param, "--") == 0) {
+		initargs_found = true;
+	}
+	return 0;
+}
+
+static void __init setup_boot_config(const char *cmdline)
+{
+	static char tmp_cmdline[COMMAND_LINE_SIZE] __initdata;
+	u32 size, csum;
+	char *data, *copy;
+	u32 *hdr;
+	int ret;
+
+	strlcpy(tmp_cmdline, boot_command_line, COMMAND_LINE_SIZE);
+	parse_args("bootconfig", tmp_cmdline, NULL, 0, 0, 0, NULL,
+		   bootconfig_params);
+
+	if (!bootconfig_found)
+		return;
+
+	if (!initrd_end)
+		goto not_found;
+
+	hdr = (u32 *)(initrd_end - 8);
+	size = hdr[0];
+	csum = hdr[1];
+
+	if (size >= XBC_DATA_MAX) {
+		pr_err("bootconfig size %d greater than max size %d\n",
+			size, XBC_DATA_MAX);
+		return;
+	}
+
+	data = ((void *)hdr) - size;
+	if ((unsigned long)data < initrd_start)
+		goto not_found;
+
+	if (boot_config_checksum((unsigned char *)data, size) != csum) {
+		pr_err("bootconfig checksum failed\n");
+		return;
+	}
+
+	copy = memblock_alloc(size + 1, SMP_CACHE_BYTES);
+	if (!copy) {
+		pr_err("Failed to allocate memory for bootconfig\n");
+		return;
+	}
+
+	memcpy(copy, data, size);
+	copy[size] = '\0';
+
+	ret = xbc_init(copy);
+	if (ret < 0)
+		pr_err("Failed to parse bootconfig\n");
+	else {
+		pr_info("Load bootconfig: %d bytes %d nodes\n", size, ret);
+		/* keys starting with "kernel." are passed via cmdline */
+		extra_command_line = xbc_make_cmdline("kernel");
+		/* Also, "init." keys are init arguments */
+		extra_init_args = xbc_make_cmdline("init");
+	}
+	return;
+not_found:
+	pr_err("'bootconfig' found on command line, but no bootconfig found\n");
+}
+#else
+#define setup_boot_config(cmdline)	do { } while (0)
+#endif
+
+/* Change NUL term back to "=", to make "param" the whole string. */
+static void __init repair_env_string(char *param, char *val)
+{
 	if (val) {
 		/* param=val or param="val"? */
 		if (val == param+strlen(param)+1)
@@ -256,11 +430,9 @@ static int __init repair_env_string(char *param, char *val,
 		else if (val == param+strlen(param)+2) {
 			val[-2] = '=';
 			memmove(val-1, val, strlen(val)+1);
-			val--;
 		} else
 			BUG();
 	}
-	return 0;
 }
 
 /* Anything after -- gets handed straight to init. */
@@ -272,7 +444,7 @@ static int __init set_init_arg(char *param, char *val,
 	if (panic_later)
 		return 0;
 
-	repair_env_string(param, val, unused, NULL);
+	repair_env_string(param, val);
 
 	for (i = 0; argv_init[i]; i++) {
 		if (i == MAX_INIT_ARGS) {
@@ -292,14 +464,16 @@ static int __init set_init_arg(char *param, char *val,
 static int __init unknown_bootoption(char *param, char *val,
 				     const char *unused, void *arg)
 {
-	repair_env_string(param, val, unused, NULL);
+	size_t len = strlen(param);
+
+	repair_env_string(param, val);
 
 	/* Handle obsolete-style parameters */
 	if (obsolete_checksetup(param))
 		return 0;
 
 	/* Unused module parameter. */
-	if (strchr(param, '.') && (!val || strchr(param, '.') < val))
+	if (strnchr(param, len, '.'))
 		return 0;
 
 	if (panic_later)
@@ -313,7 +487,7 @@ static int __init unknown_bootoption(char *param, char *val,
 				panic_later = "env";
 				panic_param = param;
 			}
-			if (!strncmp(param, envp_init[i], val - param))
+			if (!strncmp(param, envp_init[i], len+1))
 				break;
 		}
 		envp_init[i] = param;
@@ -374,22 +548,51 @@ static inline void smp_prepare_cpus(unsigned int maxcpus) { }
  */
 static void __init setup_command_line(char *command_line)
 {
-	size_t len = strlen(boot_command_line) + 1;
+	size_t len, xlen = 0, ilen = 0;
 
-	saved_command_line = memblock_alloc(len, SMP_CACHE_BYTES);
-	if (!saved_command_line)
-		panic("%s: Failed to allocate %zu bytes\n", __func__, len);
+	if (extra_command_line)
+		xlen = strlen(extra_command_line);
+	if (extra_init_args)
+		ilen = strlen(extra_init_args) + 4; /* for " -- " */
 
-	initcall_command_line =	memblock_alloc(len, SMP_CACHE_BYTES);
-	if (!initcall_command_line)
-		panic("%s: Failed to allocate %zu bytes\n", __func__, len);
+	len = xlen + strlen(boot_command_line) + 1;
+
+	saved_command_line = memblock_alloc(len + ilen, SMP_CACHE_BYTES);
+	if (!saved_command_line)
+		panic("%s: Failed to allocate %zu bytes\n", __func__, len + ilen);
 
 	static_command_line = memblock_alloc(len, SMP_CACHE_BYTES);
 	if (!static_command_line)
 		panic("%s: Failed to allocate %zu bytes\n", __func__, len);
 
-	strcpy(saved_command_line, boot_command_line);
-	strcpy(static_command_line, command_line);
+	if (xlen) {
+		/*
+		 * We have to put extra_command_line before boot command
+		 * lines because there could be dashes (separator of init
+		 * command line) in the command lines.
+		 */
+		strcpy(saved_command_line, extra_command_line);
+		strcpy(static_command_line, extra_command_line);
+	}
+	strcpy(saved_command_line + xlen, boot_command_line);
+	strcpy(static_command_line + xlen, command_line);
+
+	if (ilen) {
+		/*
+		 * Append supplemental init boot args to saved_command_line
+		 * so that user can check what command line options passed
+		 * to init.
+		 */
+		len = strlen(saved_command_line);
+		if (initargs_found) {
+			saved_command_line[len++] = ' ';
+		} else {
+			strcpy(saved_command_line + len, " -- ");
+			len += 4;
+		}
+
+		strcpy(saved_command_line + len, extra_init_args);
+	}
 }
 
 /*
@@ -596,6 +799,7 @@ asmlinkage __visible void __init start_kernel(void)
 	pr_notice("%s", linux_banner);
 	early_security_init();
 	setup_arch(&command_line);
+	setup_boot_config(command_line);
 	setup_command_line(command_line);
 	setup_nr_cpu_ids();
 	setup_per_cpu_areas();
@@ -605,7 +809,7 @@ asmlinkage __visible void __init start_kernel(void)
 	build_all_zonelists(NULL);
 	page_alloc_init();
 
-	pr_notice("Kernel command line: %s\n", boot_command_line);
+	pr_notice("Kernel command line: %s\n", saved_command_line);
 	/* parameters may set static keys */
 	jump_label_init();
 	parse_early_param();
@@ -616,6 +820,9 @@ asmlinkage __visible void __init start_kernel(void)
 	if (!IS_ERR_OR_NULL(after_dashes))
 		parse_args("Setting init args", after_dashes, NULL, 0, -1, -1,
 			   NULL, set_init_arg);
+	if (extra_init_args)
+		parse_args("Setting extra init args", extra_init_args,
+			   NULL, 0, -1, -1, NULL, set_init_arg);
 
 	/*
 	 * These use large bootmem allocations and must precede
@@ -991,16 +1198,21 @@ static const char *initcall_level_names[] __initdata = {
 	"late",
 };
 
-static void __init do_initcall_level(int level)
+static int __init ignore_unknown_bootoption(char *param, char *val,
+			       const char *unused, void *arg)
+{
+	return 0;
+}
+
+static void __init do_initcall_level(int level, char *command_line)
 {
 	initcall_entry_t *fn;
 
-	strcpy(initcall_command_line, saved_command_line);
 	parse_args(initcall_level_names[level],
-		   initcall_command_line, __start___param,
+		   command_line, __start___param,
 		   __stop___param - __start___param,
 		   level, level,
-		   NULL, &repair_env_string);
+		   NULL, ignore_unknown_bootoption);
 
 	trace_initcall_level(initcall_level_names[level]);
 	for (fn = initcall_levels[level]; fn < initcall_levels[level+1]; fn++)
@@ -1010,9 +1222,20 @@ static void __init do_initcall_level(int level)
 static void __init do_initcalls(void)
 {
 	int level;
+	size_t len = strlen(saved_command_line) + 1;
+	char *command_line;
 
-	for (level = 0; level < ARRAY_SIZE(initcall_levels) - 1; level++)
-		do_initcall_level(level);
+	command_line = kzalloc(len, GFP_KERNEL);
+	if (!command_line)
+		panic("%s: Failed to allocate %zu bytes\n", __func__, len);
+
+	for (level = 0; level < ARRAY_SIZE(initcall_levels) - 1; level++) {
+		/* Parser modifies command_line, restore it each time */
+		strcpy(command_line, saved_command_line);
+		do_initcall_level(level, command_line);
+	}
+
+	kfree(command_line);
 }
 
 /*
@@ -1043,8 +1266,16 @@ static void __init do_pre_smp_initcalls(void)
 
 static int run_init_process(const char *init_filename)
 {
+	const char *const *p;
+
 	argv_init[0] = init_filename;
 	pr_info("Run %s as init process\n", init_filename);
+	pr_debug("  with arguments:\n");
+	for (p = argv_init; *p; p++)
+		pr_debug("    %s\n", *p);
+	pr_debug("  with environment:\n");
+	for (p = envp_init; *p; p++)
+		pr_debug("    %s\n", *p);
 	return do_execve(getname_kernel(init_filename),
 		(const char __user *const __user *)argv_init,
 		(const char __user *const __user *)envp_init);
@@ -1091,6 +1322,11 @@ static void mark_readonly(void)
 	} else
 		pr_info("Kernel memory protection disabled.\n");
 }
+#elif defined(CONFIG_ARCH_HAS_STRICT_KERNEL_RWX)
+static inline void mark_readonly(void)
+{
+	pr_warn("Kernel memory protection not selected by kernel config.\n");
+}
 #else
 static inline void mark_readonly(void)
 {