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2024-10-12 a5969cabbb4660eab42b6ef0412cbbd1200cf14d 
 kernel/arch/powerpc/platforms/pseries/lparcfg.c
....@@ -1,3 +1,4 @@
1
+// SPDX-License-Identifier: GPL-2.0-or-later
12 /*
23  * PowerPC64 LPAR Configuration Information Driver
34  *
....@@ -8,11 +9,6 @@
89  *    seq_file updates, Copyright (c) 2004 Will Schmidt IBM Corporation.
910  * Nathan Lynch nathanl@austin.ibm.com
1011  *    Added lparcfg_write, Copyright (C) 2004 Nathan Lynch IBM Corporation.
11
- *
12
- *      This program is free software; you can redistribute it and/or
13
- *      modify it under the terms of the GNU General Public License
14
- *      as published by the Free Software Foundation; either version
15
- *      2 of the License, or (at your option) any later version.
1612  *
1713  * This driver creates a proc file at /proc/ppc64/lparcfg which contains
1814  * keyword - value pairs that specify the configuration of the partition.
....@@ -26,6 +22,7 @@
2622 #include <linux/seq_file.h>
2723 #include <linux/slab.h>
2824 #include <linux/uaccess.h>
25
+#include <linux/hugetlb.h>
2926 #include <asm/lppaca.h>
3027 #include <asm/hvcall.h>
3128 #include <asm/firmware.h>
....@@ -36,6 +33,7 @@
3633 #include <asm/vio.h>
3734 #include <asm/mmu.h>
3835 #include <asm/machdep.h>
36
+#include <asm/drmem.h>
3937 
4038 #include "pseries.h"
4139 
....@@ -138,6 +136,39 @@
138136 	return rc;
139137 }
140138 
139
+static void show_gpci_data(struct seq_file *m)
140
+{
141
+	struct hv_gpci_request_buffer *buf;
142
+	unsigned int affinity_score;
143
+	long ret;
144
+
145
+	buf = kmalloc(sizeof(*buf), GFP_KERNEL);
146
+	if (buf == NULL)
147
+		return;
148
+
149
+	/*
150
+	 * Show the local LPAR's affinity score.
151
+	 *
152
+	 * 0xB1 selects the Affinity_Domain_Info_By_Partition subcall.
153
+	 * The score is at byte 0xB in the output buffer.
154
+	 */
155
+	memset(&buf->params, 0, sizeof(buf->params));
156
+	buf->params.counter_request = cpu_to_be32(0xB1);
157
+	buf->params.starting_index = cpu_to_be32(-1);	/* local LPAR */
158
+	buf->params.counter_info_version_in = 0x5;	/* v5+ for score */
159
+	ret = plpar_hcall_norets(H_GET_PERF_COUNTER_INFO, virt_to_phys(buf),
160
+				 sizeof(*buf));
161
+	if (ret != H_SUCCESS) {
162
+		pr_debug("hcall failed: H_GET_PERF_COUNTER_INFO: %ld, %x\n",
163
+			 ret, be32_to_cpu(buf->params.detail_rc));
164
+		goto out;
165
+	}
166
+	affinity_score = buf->bytes[0xB];
167
+	seq_printf(m, "partition_affinity_score=%u\n", affinity_score);
168
+out:
169
+	kfree(buf);
170
+}
171
+
141172 static unsigned h_pic(unsigned long *pool_idle_time,
142173 		      unsigned long *num_procs)
143174 {
....@@ -174,7 +205,7 @@
174205 	           ppp_data.active_system_procs);
175206 
176207 	/* pool related entries are appropriate for shared configs */
177
-	if (lppaca_shared_proc(get_lppaca())) {
208
+	if (lppaca_shared_proc()) {
178209 		unsigned long pool_idle_time, pool_procs;
179210 
180211 		seq_printf(m, "pool=%d\n", ppp_data.pool_num);
....@@ -291,6 +322,7 @@
291322  */
292323 static void parse_system_parameter_string(struct seq_file *m)
293324 {
325
+	const s32 token = rtas_token("ibm,get-system-parameter");
294326 	int call_status;
295327 
296328 	unsigned char *local_buffer = kmalloc(SPLPAR_MAXLENGTH, GFP_KERNEL);
....@@ -300,16 +332,15 @@
300332 		return;
301333 	}
302334 
303
-	spin_lock(&rtas_data_buf_lock);
304
-	memset(rtas_data_buf, 0, SPLPAR_MAXLENGTH);
305
-	call_status = rtas_call(rtas_token("ibm,get-system-parameter"), 3, 1,
306
-				NULL,
307
-				SPLPAR_CHARACTERISTICS_TOKEN,
308
-				__pa(rtas_data_buf),
309
-				RTAS_DATA_BUF_SIZE);
310
-	memcpy(local_buffer, rtas_data_buf, SPLPAR_MAXLENGTH);
311
-	local_buffer[SPLPAR_MAXLENGTH - 1] = '\0';
312
-	spin_unlock(&rtas_data_buf_lock);
335
+	do {
336
+		spin_lock(&rtas_data_buf_lock);
337
+		memset(rtas_data_buf, 0, SPLPAR_MAXLENGTH);
338
+		call_status = rtas_call(token, 3, 1, NULL, SPLPAR_CHARACTERISTICS_TOKEN,
339
+					__pa(rtas_data_buf), RTAS_DATA_BUF_SIZE);
340
+		memcpy(local_buffer, rtas_data_buf, SPLPAR_MAXLENGTH);
341
+		local_buffer[SPLPAR_MAXLENGTH - 1] = '\0';
342
+		spin_unlock(&rtas_data_buf_lock);
343
+	} while (rtas_busy_delay(call_status));
313344 
314345 	if (call_status != 0) {
315346 		printk(KERN_INFO
....@@ -433,6 +464,16 @@
433464 		seq_printf(m, "power_mode_data=%016lx\n", retbuf[0]);
434465 }
435466 
467
+static void maxmem_data(struct seq_file *m)
468
+{
469
+	unsigned long maxmem = 0;
470
+
471
+	maxmem += (unsigned long)drmem_info->n_lmbs * drmem_info->lmb_size;
472
+	maxmem += hugetlb_total_pages() * PAGE_SIZE;
473
+
474
+	seq_printf(m, "MaxMem=%lu\n", maxmem);
475
+}
476
+
436477 static int pseries_lparcfg_data(struct seq_file *m, void *v)
437478 {
438479 	int partition_potential_processors;
....@@ -463,6 +504,7 @@
463504 		splpar_dispatch_data(m);
464505 
465506 		seq_printf(m, "purr=%ld\n", get_purr());
507
+		seq_printf(m, "tbr=%ld\n", mftb());
466508 	} else {		/* non SPLPAR case */
467509 
468510 		seq_printf(m, "system_active_processors=%d\n",
....@@ -478,6 +520,8 @@
478520 			   partition_active_processors * 100);
479521 	}
480522 
523
+	show_gpci_data(m);
524
+
481525 	seq_printf(m, "partition_active_processors=%d\n",
482526 		   partition_active_processors);
483527 
....@@ -485,12 +529,13 @@
485529 		   partition_potential_processors);
486530 
487531 	seq_printf(m, "shared_processor_mode=%d\n",
488
-		   lppaca_shared_proc(get_lppaca()));
532
+		   lppaca_shared_proc());
489533 
490534 #ifdef CONFIG_PPC_BOOK3S_64
491535 	seq_printf(m, "slb_size=%d\n", mmu_slb_size);
492536 #endif
493537 	parse_em_data(m);
538
+	maxmem_data(m);
494539 
495540 	return 0;
496541 }
....@@ -585,8 +630,7 @@
585630 static ssize_t lparcfg_write(struct file *file, const char __user * buf,
586631 			     size_t count, loff_t * off)
587632 {
588
-	int kbuf_sz = 64;
589
-	char kbuf[kbuf_sz];
633
+	char kbuf[64];
590634 	char *tmp;
591635 	u64 new_entitled, *new_entitled_ptr = &new_entitled;
592636 	u8 new_weight, *new_weight_ptr = &new_weight;
....@@ -595,7 +639,7 @@
595639 	if (!firmware_has_feature(FW_FEATURE_SPLPAR))
596640 		return -EINVAL;
597641 
598
-	if (count > kbuf_sz)
642
+	if (count > sizeof(kbuf))
599643 		return -EINVAL;
600644 
601645 	if (copy_from_user(kbuf, buf, count))
....@@ -689,12 +733,12 @@
689733 	return single_open(file, lparcfg_data, NULL);
690734 }
691735 
692
-static const struct file_operations lparcfg_fops = {
693
-	.read		= seq_read,
694
-	.write		= lparcfg_write,
695
-	.open		= lparcfg_open,
696
-	.release	= single_release,
697
-	.llseek		= seq_lseek,
736
+static const struct proc_ops lparcfg_proc_ops = {
737
+	.proc_read	= seq_read,
738
+	.proc_write	= lparcfg_write,
739
+	.proc_open	= lparcfg_open,
740
+	.proc_release	= single_release,
741
+	.proc_lseek	= seq_lseek,
698742 };
699743 
700744 static int __init lparcfg_init(void)
....@@ -705,7 +749,7 @@
705749 	if (firmware_has_feature(FW_FEATURE_SPLPAR))
706750 		mode |= 0200;
707751 
708
-	if (!proc_create("powerpc/lparcfg", mode, NULL, &lparcfg_fops)) {
752
+	if (!proc_create("powerpc/lparcfg", mode, NULL, &lparcfg_proc_ops)) {
709753 		printk(KERN_ERR "Failed to create powerpc/lparcfg\n");
710754 		return -EIO;
711755 	}