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2024-10-12 a5969cabbb4660eab42b6ef0412cbbd1200cf14d 
 kernel/arch/powerpc/platforms/pseries/setup.c
....@@ -1,3 +1,4 @@
1
+// SPDX-License-Identifier: GPL-2.0-or-later
12 /*
23  *  64-bit pSeries and RS/6000 setup code.
34  *
....@@ -5,11 +6,6 @@
56  *  Adapted from 'alpha' version by Gary Thomas
67  *  Modified by Cort Dougan (cort@cs.nmt.edu)
78  *  Modified by PPC64 Team, IBM Corp
8
- *
9
- * This program is free software; you can redistribute it and/or
10
- * modify it under the terms of the GNU General Public License
11
- * as published by the Free Software Foundation; either version
12
- * 2 of the License, or (at your option) any later version.
139  */
1410 
1511 /*
....@@ -42,11 +38,11 @@
4238 #include <linux/of.h>
4339 #include <linux/of_pci.h>
4440 #include <linux/memblock.h>
41
+#include <linux/swiotlb.h>
4542 
4643 #include <asm/mmu.h>
4744 #include <asm/processor.h>
4845 #include <asm/io.h>
49
-#include <asm/pgtable.h>
5046 #include <asm/prom.h>
5147 #include <asm/rtas.h>
5248 #include <asm/pci-bridge.h>
....@@ -71,6 +67,10 @@
7167 #include <asm/isa-bridge.h>
7268 #include <asm/security_features.h>
7369 #include <asm/asm-const.h>
70
+#include <asm/idle.h>
71
+#include <asm/swiotlb.h>
72
+#include <asm/svm.h>
73
+#include <asm/dtl.h>
7474 
7575 #include "pseries.h"
7676 #include "../../../../drivers/pci/pci.h"
....@@ -84,6 +84,7 @@
8484 EXPORT_SYMBOL(CMO_PageSize);
8585 
8686 int fwnmi_active;  /* TRUE if an FWNMI handler is present */
87
+int ibm_nmi_interlock_token;
8788 
8889 static void pSeries_show_cpuinfo(struct seq_file *m)
8990 {
....@@ -110,9 +111,18 @@
110111 	u8 *mce_data_buf;
111112 	unsigned int i;
112113 	int nr_cpus = num_possible_cpus();
114
+#ifdef CONFIG_PPC_BOOK3S_64
115
+	struct slb_entry *slb_ptr;
116
+	size_t size;
117
+#endif
118
+	int ibm_nmi_register_token;
113119 
114
-	int ibm_nmi_register = rtas_token("ibm,nmi-register");
115
-	if (ibm_nmi_register == RTAS_UNKNOWN_SERVICE)
120
+	ibm_nmi_register_token = rtas_token("ibm,nmi-register");
121
+	if (ibm_nmi_register_token == RTAS_UNKNOWN_SERVICE)
122
+		return;
123
+
124
+	ibm_nmi_interlock_token = rtas_token("ibm,nmi-interlock");
125
+	if (WARN_ON(ibm_nmi_interlock_token == RTAS_UNKNOWN_SERVICE))
116126 		return;
117127 
118128 	/* If the kernel's not linked at zero we point the firmware at low
....@@ -120,8 +130,8 @@
120130 	system_reset_addr  = __pa(system_reset_fwnmi) - PHYSICAL_START;
121131 	machine_check_addr = __pa(machine_check_fwnmi) - PHYSICAL_START;
122132 
123
-	if (0 == rtas_call(ibm_nmi_register, 2, 1, NULL, system_reset_addr,
124
-				machine_check_addr))
133
+	if (0 == rtas_call(ibm_nmi_register_token, 2, 1, NULL,
134
+			   system_reset_addr, machine_check_addr))
125135 		fwnmi_active = 1;
126136 
127137 	/*
....@@ -129,12 +139,33 @@
129139 	 * It will be used in real mode mce handler, hence it needs to be
130140 	 * below RMA.
131141 	 */
132
-	mce_data_buf = __va(memblock_alloc_base(RTAS_ERROR_LOG_MAX * nr_cpus,
133
-					RTAS_ERROR_LOG_MAX, ppc64_rma_size));
142
+	mce_data_buf = memblock_alloc_try_nid_raw(RTAS_ERROR_LOG_MAX * nr_cpus,
143
+					RTAS_ERROR_LOG_MAX, MEMBLOCK_LOW_LIMIT,
144
+					ppc64_rma_size, NUMA_NO_NODE);
145
+	if (!mce_data_buf)
146
+		panic("Failed to allocate %d bytes below %pa for MCE buffer\n",
147
+		      RTAS_ERROR_LOG_MAX * nr_cpus, &ppc64_rma_size);
148
+
134149 	for_each_possible_cpu(i) {
135150 		paca_ptrs[i]->mce_data_buf = mce_data_buf +
136151 						(RTAS_ERROR_LOG_MAX * i);
137152 	}
153
+
154
+#ifdef CONFIG_PPC_BOOK3S_64
155
+	if (!radix_enabled()) {
156
+		/* Allocate per cpu area to save old slb contents during MCE */
157
+		size = sizeof(struct slb_entry) * mmu_slb_size * nr_cpus;
158
+		slb_ptr = memblock_alloc_try_nid_raw(size,
159
+				sizeof(struct slb_entry), MEMBLOCK_LOW_LIMIT,
160
+				ppc64_rma_size, NUMA_NO_NODE);
161
+		if (!slb_ptr)
162
+			panic("Failed to allocate %zu bytes below %pa for slb area\n",
163
+			      size, &ppc64_rma_size);
164
+
165
+		for_each_possible_cpu(i)
166
+			paca_ptrs[i]->mce_faulty_slbs = slb_ptr + (mmu_slb_size * i);
167
+	}
168
+#endif
138169 }
139170 
140171 static void pseries_8259_cascade(struct irq_desc *desc)
....@@ -180,7 +211,7 @@
180211 		of_node_put(old);
181212 		if (np == NULL)
182213 			break;
183
-		if (strcmp(np->name, "pci") != 0)
214
+		if (!of_node_name_eq(np, "pci"))
184215 			continue;
185216 		addrp = of_get_property(np, "8259-interrupt-acknowledge", NULL);
186217 		if (addrp == NULL)
....@@ -257,46 +288,16 @@
257288  */
258289 static int alloc_dispatch_logs(void)
259290 {
260
-	int cpu, ret;
261
-	struct paca_struct *pp;
262
-	struct dtl_entry *dtl;
263
-
264291 	if (!firmware_has_feature(FW_FEATURE_SPLPAR))
265292 		return 0;
266293 
267294 	if (!dtl_cache)
268295 		return 0;
269296 
270
-	for_each_possible_cpu(cpu) {
271
-		pp = paca_ptrs[cpu];
272
-		dtl = kmem_cache_alloc(dtl_cache, GFP_KERNEL);
273
-		if (!dtl) {
274
-			pr_warn("Failed to allocate dispatch trace log for cpu %d\n",
275
-				cpu);
276
-			pr_warn("Stolen time statistics will be unreliable\n");
277
-			break;
278
-		}
279
-
280
-		pp->dtl_ridx = 0;
281
-		pp->dispatch_log = dtl;
282
-		pp->dispatch_log_end = dtl + N_DISPATCH_LOG;
283
-		pp->dtl_curr = dtl;
284
-	}
297
+	alloc_dtl_buffers(0);
285298 
286299 	/* Register the DTL for the current (boot) cpu */
287
-	dtl = get_paca()->dispatch_log;
288
-	get_paca()->dtl_ridx = 0;
289
-	get_paca()->dtl_curr = dtl;
290
-	get_paca()->lppaca_ptr->dtl_idx = 0;
291
-
292
-	/* hypervisor reads buffer length from this field */
293
-	dtl->enqueue_to_dispatch_time = cpu_to_be32(DISPATCH_LOG_BYTES);
294
-	ret = register_dtl(hard_smp_processor_id(), __pa(dtl));
295
-	if (ret)
296
-		pr_err("WARNING: DTL registration of cpu %d (hw %d) failed "
297
-		       "with %d\n", smp_processor_id(),
298
-		       hard_smp_processor_id(), ret);
299
-	get_paca()->lppaca_ptr->dtl_enable_mask = 2;
300
+	register_dtl_buffer(smp_processor_id());
300301 
301302 	return 0;
302303 }
....@@ -309,8 +310,10 @@
309310 
310311 static int alloc_dispatch_log_kmem_cache(void)
311312 {
313
+	void (*ctor)(void *) = get_dtl_cache_ctor();
314
+
312315 	dtl_cache = kmem_cache_create("dtl", DISPATCH_LOG_BYTES,
313
-						DISPATCH_LOG_BYTES, 0, NULL);
316
+						DISPATCH_LOG_BYTES, 0, ctor);
314317 	if (!dtl_cache) {
315318 		pr_warn("Failed to create dispatch trace log buffer cache\n");
316319 		pr_warn("Stolen time statistics will be unreliable\n");
....@@ -321,6 +324,9 @@
321324 }
322325 machine_early_initcall(pseries, alloc_dispatch_log_kmem_cache);
323326 
327
+DEFINE_PER_CPU(u64, idle_spurr_cycles);
328
+DEFINE_PER_CPU(u64, idle_entry_purr_snap);
329
+DEFINE_PER_CPU(u64, idle_entry_spurr_snap);
324330 static void pseries_lpar_idle(void)
325331 {
326332 	/*
....@@ -332,7 +338,7 @@
332338 		return;
333339 
334340 	/* Indicate to hypervisor that we are idle. */
335
-	get_lppaca()->idle = 1;
341
+	pseries_idle_prolog();
336342 
337343 	/*
338344 	 * Yield the processor to the hypervisor.  We return if
....@@ -343,7 +349,7 @@
343349 	 */
344350 	cede_processor();
345351 
346
-	get_lppaca()->idle = 0;
352
+	pseries_idle_epilog();
347353 }
348354 
349355 /*
....@@ -353,7 +359,7 @@
353359  * to ever be a problem in practice we can move this into a kernel thread to
354360  * finish off the process later in boot.
355361  */
356
-void pseries_enable_reloc_on_exc(void)
362
+bool pseries_enable_reloc_on_exc(void)
357363 {
358364 	long rc;
359365 	unsigned int delay, total_delay = 0;
....@@ -364,11 +370,13 @@
364370 			if (rc == H_P2) {
365371 				pr_info("Relocation on exceptions not"
366372 					" supported\n");
373
+				return false;
367374 			} else if (rc != H_SUCCESS) {
368375 				pr_warn("Unable to enable relocation"
369376 					" on exceptions: %ld\n", rc);
377
+				return false;
370378 			}
371
-			break;
379
+			return true;
372380 		}
373381 
374382 		delay = get_longbusy_msecs(rc);
....@@ -377,7 +385,7 @@
377385 			pr_warn("Warning: Giving up waiting to enable "
378386 				"relocation on exceptions (%u msec)!\n",
379387 				total_delay);
380
-			return;
388
+			return false;
381389 		}
382390 
383391 		mdelay(delay);
....@@ -462,8 +470,8 @@
462470 	struct device_node *root = of_find_node_by_path("/");
463471 
464472 	for_each_child_of_node(root, node) {
465
-		if (node->type == NULL || (strcmp(node->type, "pci") != 0 &&
466
-					   strcmp(node->type, "pciex") != 0))
473
+		if (!of_node_is_type(node, "pci") &&
474
+		    !of_node_is_type(node, "pciex"))
467475 			continue;
468476 
469477 		phb = pcibios_alloc_controller(node);
....@@ -511,8 +519,14 @@
511519 	if (result->character & H_CPU_CHAR_BCCTR_FLUSH_ASSIST)
512520 		security_ftr_set(SEC_FTR_BCCTR_FLUSH_ASSIST);
513521 
522
+	if (result->character & H_CPU_CHAR_BCCTR_LINK_FLUSH_ASSIST)
523
+		security_ftr_set(SEC_FTR_BCCTR_LINK_FLUSH_ASSIST);
524
+
514525 	if (result->behaviour & H_CPU_BEHAV_FLUSH_COUNT_CACHE)
515526 		security_ftr_set(SEC_FTR_FLUSH_COUNT_CACHE);
527
+
528
+	if (result->behaviour & H_CPU_BEHAV_FLUSH_LINK_STACK)
529
+		security_ftr_set(SEC_FTR_FLUSH_LINK_STACK);
516530 
517531 	/*
518532 	 * The features below are enabled by default, so we instead look to see
....@@ -524,11 +538,17 @@
524538 	if (!(result->behaviour & H_CPU_BEHAV_L1D_FLUSH_PR))
525539 		security_ftr_clear(SEC_FTR_L1D_FLUSH_PR);
526540 
541
+	if (result->behaviour & H_CPU_BEHAV_NO_L1D_FLUSH_ENTRY)
542
+		security_ftr_clear(SEC_FTR_L1D_FLUSH_ENTRY);
543
+
544
+	if (result->behaviour & H_CPU_BEHAV_NO_L1D_FLUSH_UACCESS)
545
+		security_ftr_clear(SEC_FTR_L1D_FLUSH_UACCESS);
546
+
527547 	if (!(result->behaviour & H_CPU_BEHAV_BNDS_CHK_SPEC_BAR))
528548 		security_ftr_clear(SEC_FTR_BNDS_CHK_SPEC_BAR);
529549 }
530550 
531
-void pseries_setup_rfi_flush(void)
551
+void pseries_setup_security_mitigations(void)
532552 {
533553 	struct h_cpu_char_result result;
534554 	enum l1d_flush_type types;
....@@ -573,6 +593,8 @@
573593 	enable = security_ftr_enabled(SEC_FTR_FAVOUR_SECURITY) &&
574594 		 security_ftr_enabled(SEC_FTR_L1D_FLUSH_UACCESS);
575595 	setup_uaccess_flush(enable);
596
+
597
+	setup_stf_barrier();
576598 }
577599 
578600 #ifdef CONFIG_PCI_IOV
....@@ -748,6 +770,11 @@
748770 	smp_init_pseries();
749771 
750772 
773
+	if (radix_enabled() && !mmu_has_feature(MMU_FTR_GTSE))
774
+		if (!firmware_has_feature(FW_FEATURE_RPT_INVALIDATE))
775
+			panic("BUG: Radix support requires either GTSE or RPT_INVALIDATE\n");
776
+
777
+
751778 	/* openpic global configuration register (64-bit format). */
752779 	/* openpic Interrupt Source Unit pointer (64-bit format). */
753780 	/* python0 facility area (mmio) (64-bit format) REAL address. */
....@@ -757,8 +784,8 @@
757784 
758785 	fwnmi_init();
759786 
760
-	pseries_setup_rfi_flush();
761
-	setup_stf_barrier();
787
+	pseries_setup_security_mitigations();
788
+	pseries_lpar_read_hblkrm_characteristics();
762789 
763790 	/* By default, only probe PCI (can be overridden by rtas_pci) */
764791 	pci_add_flags(PCI_PROBE_ONLY);
....@@ -773,8 +800,10 @@
773800 	if (firmware_has_feature(FW_FEATURE_LPAR)) {
774801 		vpa_init(boot_cpuid);
775802 
776
-		if (lppaca_shared_proc(get_lppaca()))
803
+		if (lppaca_shared_proc()) {
777804 			static_branch_enable(&shared_processor);
805
+			pv_spinlocks_init();
806
+		}
778807 
779808 		ppc_md.power_save = pseries_lpar_idle;
780809 		ppc_md.enable_pmcs = pseries_lpar_enable_pmcs;
....@@ -792,6 +821,11 @@
792821 	}
793822 
794823 	ppc_md.pcibios_root_bridge_prepare = pseries_root_bridge_prepare;
824
+
825
+	if (swiotlb_force == SWIOTLB_FORCE)
826
+		ppc_swiotlb_enable = 1;
827
+
828
+	pseries_rng_init();
795829 }
796830 
797831 static void pseries_panic(char *str)
....@@ -830,12 +864,15 @@
830864 	return plpar_hcall_norets(H_SET_XDABR, dabr, dabrx);
831865 }
832866 
833
-static int pseries_set_dawr(unsigned long dawr, unsigned long dawrx)
867
+static int pseries_set_dawr(int nr, unsigned long dawr, unsigned long dawrx)
834868 {
835869 	/* PAPR says we can't set HYP */
836870 	dawrx &= ~DAWRX_HYP;
837871 
838
-	return  plpar_set_watchpoint0(dawr, dawrx);
872
+	if (nr == 0)
873
+		return plpar_set_watchpoint0(dawr, dawrx);
874
+	else
875
+		return plpar_set_watchpoint1(dawr, dawrx);
839876 }
840877 
841878 #define CMO_CHARACTERISTICS_TOKEN 44
....@@ -983,11 +1020,7 @@
9831020 
9841021 static int __init pSeries_probe(void)
9851022 {
986
-	const char *dtype = of_get_property(of_root, "device_type", NULL);
987
-
988
- 	if (dtype == NULL)
989
- 		return 0;
990
- 	if (strcmp(dtype, "chrp"))
1023
+	if (!of_node_is_type(of_root, "chrp"))
9911024 		return 0;
9921025 
9931026 	/* Cell blades firmware claims to be chrp while it's not. Until this
....@@ -1035,6 +1068,7 @@
10351068 	.calibrate_decr		= generic_calibrate_decr,
10361069 	.progress		= rtas_progress,
10371070 	.system_reset_exception = pSeries_system_reset_exception,
1071
+	.machine_check_early	= pseries_machine_check_realmode,
10381072 	.machine_check_exception = pSeries_machine_check_exception,
10391073 #ifdef CONFIG_KEXEC_CORE
10401074 	.machine_kexec          = pSeries_machine_kexec,