add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/arch/s390/kernel/diag.c
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@@ -13,6 +13,7 @@
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 #include <linux/debugfs.h>
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 #include <asm/diag.h>
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 #include <asm/trace/diag.h>
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+#include <asm/sections.h>
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 struct diag_stat {
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 	unsigned int counter[NR_DIAG_STAT];
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@@ -45,8 +46,12 @@
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 	[DIAG_STAT_X2FC] = { .code = 0x2fc, .name = "Guest Performance Data" },
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 	[DIAG_STAT_X304] = { .code = 0x304, .name = "Partition-Resource Service" },
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 	[DIAG_STAT_X308] = { .code = 0x308, .name = "List-Directed IPL" },
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+	[DIAG_STAT_X318] = { .code = 0x318, .name = "CP Name and Version Codes" },
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 	[DIAG_STAT_X500] = { .code = 0x500, .name = "Virtio Service" },
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 };
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+
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+struct diag_ops __bootdata_preserved(diag_dma_ops);
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+struct diag210 *__bootdata_preserved(__diag210_tmp_dma);
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 static int show_diag_stat(struct seq_file *m, void *v)
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 {
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@@ -99,18 +104,7 @@
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 	.show	= show_diag_stat,
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 };
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-static int show_diag_stat_open(struct inode *inode, struct file *file)
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-{
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-	return seq_open(file, &show_diag_stat_sops);
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-}
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-
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-static const struct file_operations show_diag_stat_fops = {
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-	.open		= show_diag_stat_open,
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-	.read		= seq_read,
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-	.llseek		= seq_lseek,
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-	.release	= seq_release,
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-};
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-
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+DEFINE_SEQ_ATTRIBUTE(show_diag_stat);
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 static int __init show_diag_stat_init(void)
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 {
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@@ -138,30 +132,10 @@
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 /*
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  * Diagnose 14: Input spool file manipulation
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  */
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-static inline int __diag14(unsigned long rx, unsigned long ry1,
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-			   unsigned long subcode)
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-{
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-	register unsigned long _ry1 asm("2") = ry1;
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-	register unsigned long _ry2 asm("3") = subcode;
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-	int rc = 0;
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-
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-	asm volatile(
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-		"   sam31\n"
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-		"   diag    %2,2,0x14\n"
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-		"   sam64\n"
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-		"   ipm     %0\n"
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-		"   srl     %0,28\n"
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-		: "=d" (rc), "+d" (_ry2)
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-		: "d" (rx), "d" (_ry1)
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-		: "cc");
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-
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-	return rc;
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-}
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-
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 int diag14(unsigned long rx, unsigned long ry1, unsigned long subcode)
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 {
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 	diag_stat_inc(DIAG_STAT_X014);
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-	return __diag14(rx, ry1, subcode);
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+	return diag_dma_ops.diag14(rx, ry1, subcode);
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 }
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 EXPORT_SYMBOL(diag14);
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@@ -194,30 +168,17 @@
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  */
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 int diag210(struct diag210 *addr)
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 {
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-	/*
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-	 * diag 210 needs its data below the 2GB border, so we
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-	 * use a static data area to be sure
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-	 */
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-	static struct diag210 diag210_tmp;
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 	static DEFINE_SPINLOCK(diag210_lock);
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 	unsigned long flags;
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 	int ccode;
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 	spin_lock_irqsave(&diag210_lock, flags);
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-	diag210_tmp = *addr;
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+	*__diag210_tmp_dma = *addr;
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 	diag_stat_inc(DIAG_STAT_X210);
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-	asm volatile(
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-		"	lhi	%0,-1\n"
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-		"	sam31\n"
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-		"	diag	%1,0,0x210\n"
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-		"0:	ipm	%0\n"
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-		"	srl	%0,28\n"
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-		"1:	sam64\n"
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-		EX_TABLE(0b, 1b)
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-		: "=&d" (ccode) : "a" (&diag210_tmp) : "cc", "memory");
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+	ccode = diag_dma_ops.diag210(__diag210_tmp_dma);
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-	*addr = diag210_tmp;
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+	*addr = *__diag210_tmp_dma;
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 	spin_unlock_irqrestore(&diag210_lock, flags);
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 	return ccode;
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@@ -242,27 +203,9 @@
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 /*
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  * Diagnose 26C: Access Certain System Information
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  */
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-static inline int __diag26c(void *req, void *resp, enum diag26c_sc subcode)
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-{
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-	register unsigned long _req asm("2") = (addr_t) req;
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-	register unsigned long _resp asm("3") = (addr_t) resp;
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-	register unsigned long _subcode asm("4") = subcode;
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-	register unsigned long _rc asm("5") = -EOPNOTSUPP;
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-
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-	asm volatile(
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-		"	sam31\n"
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-		"	diag	%[rx],%[ry],0x26c\n"
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-		"0:	sam64\n"
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-		EX_TABLE(0b,0b)
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-		: "+d" (_rc)
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-		: [rx] "d" (_req), "d" (_resp), [ry] "d" (_subcode)
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-		: "cc", "memory");
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-	return _rc;
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-}
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-
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 int diag26c(void *req, void *resp, enum diag26c_sc subcode)
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 {
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 	diag_stat_inc(DIAG_STAT_X26C);
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-	return __diag26c(req, resp, subcode);
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+	return diag_dma_ops.diag26c(req, resp, subcode);
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 }
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 EXPORT_SYMBOL(diag26c);