Home | History | Annotate | Line # | Download | only in acpi
cpu_acpi.c revision 1.17 
      1 /* $NetBSD: cpu_acpi.c,v 1.17 2024/12/30 19:17:21 jmcneill Exp $ */
      2 
      3 /*-
      4  * Copyright (c) 2018 The NetBSD Foundation, Inc.
      5  * All rights reserved.
      6  *
      7  * This code is derived from software contributed to The NetBSD Foundation
      8  * by Jared McNeill <jmcneill (at) invisible.ca>.
      9  *
     10  * Redistribution and use in source and binary forms, with or without
     11  * modification, are permitted provided that the following conditions
     12  * are met:
     13  * 1. Redistributions of source code must retain the above copyright
     14  *    notice, this list of conditions and the following disclaimer.
     15  * 2. Redistributions in binary form must reproduce the above copyright
     16  *    notice, this list of conditions and the following disclaimer in the
     17  *    documentation and/or other materials provided with the distribution.
     18  *
     19  * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
     20  * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
     21  * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
     22  * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
     23  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
     24  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
     25  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
     26  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
     27  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
     28  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
     29  * POSSIBILITY OF SUCH DAMAGE.
     30  */
     31 
     32 #include "tprof.h"
     33 #include "opt_multiprocessor.h"
     34 
     35 #include <sys/cdefs.h>
     36 __KERNEL_RCSID(0, "$NetBSD: cpu_acpi.c,v 1.17 2024/12/30 19:17:21 jmcneill Exp $");
     37 
     38 #include <sys/param.h>
     39 #include <sys/bus.h>
     40 #include <sys/cpu.h>
     41 #include <sys/device.h>
     42 #include <sys/interrupt.h>
     43 #include <sys/kcpuset.h>
     44 #include <sys/kmem.h>
     45 #include <sys/reboot.h>
     46 
     47 #include <dev/acpi/acpireg.h>
     48 #include <dev/acpi/acpivar.h>
     49 #include <dev/acpi/acpi_srat.h>
     50 #include <external/bsd/acpica/dist/include/amlresrc.h>
     51 
     52 #include <arm/armreg.h>
     53 #include <arm/cpu.h>
     54 #include <arm/cpufunc.h>
     55 #include <arm/cpuvar.h>
     56 #include <arm/locore.h>
     57 
     58 #include <arm/arm/psci.h>
     59 
     60 #define LPI_IDLE_FACTOR		3
     61 
     62 #if NTPROF > 0
     63 #include <dev/tprof/tprof_armv8.h>
     64 #endif
     65 
     66 static int	cpu_acpi_match(device_t, cfdata_t, void *);
     67 static void	cpu_acpi_attach(device_t, device_t, void *);
     68 
     69 static void	cpu_acpi_probe_lpi(device_t, struct cpu_info *ci);
     70 void		cpu_acpi_lpi_idle(void);
     71 
     72 #if NTPROF > 0
     73 static void	cpu_acpi_tprof_init(device_t);
     74 #endif
     75 
     76 CFATTACH_DECL2_NEW(cpu_acpi, 0,
     77     cpu_acpi_match, cpu_acpi_attach, NULL, NULL,
     78     cpu_rescan, cpu_childdetached);
     79 
     80 #ifdef MULTIPROCESSOR
     81 static register_t
     82 cpu_acpi_mpstart_pa(void)
     83 {
     84 
     85 	return (register_t)KERN_VTOPHYS((vaddr_t)cpu_mpstart);
     86 }
     87 #endif /* MULTIPROCESSOR */
     88 
     89 static int
     90 cpu_acpi_match(device_t parent, cfdata_t cf, void *aux)
     91 {
     92 	ACPI_SUBTABLE_HEADER *hdrp = aux;
     93 	ACPI_MADT_GENERIC_INTERRUPT *gicc;
     94 
     95 	if (hdrp->Type != ACPI_MADT_TYPE_GENERIC_INTERRUPT)
     96 		return 0;
     97 
     98 	gicc = (ACPI_MADT_GENERIC_INTERRUPT *)hdrp;
     99 
    100 	return (gicc->Flags & ACPI_MADT_ENABLED) != 0;
    101 }
    102 
    103 static void
    104 cpu_acpi_attach(device_t parent, device_t self, void *aux)
    105 {
    106 	prop_dictionary_t dict = device_properties(self);
    107 	ACPI_MADT_GENERIC_INTERRUPT *gicc = aux;
    108 	const uint64_t mpidr = gicc->ArmMpidr;
    109 	const int unit = device_unit(self);
    110 	struct cpu_info *ci = &cpu_info_store[unit];
    111 	struct acpisrat_node *node;
    112 
    113 #ifdef MULTIPROCESSOR
    114 	if (cpu_mpidr_aff_read() != mpidr && (boothowto & RB_MD1) == 0) {
    115 		const u_int cpuindex = device_unit(self);
    116 		int error;
    117 
    118 		cpu_mpidr[cpuindex] = mpidr;
    119 		cpu_dcache_wb_range((vaddr_t)&cpu_mpidr[cpuindex],
    120 		    sizeof(cpu_mpidr[cpuindex]));
    121 
    122 		/* XXX support spin table */
    123 		error = psci_cpu_on(mpidr, cpu_acpi_mpstart_pa(), 0);
    124 		if (error != PSCI_SUCCESS) {
    125 			aprint_error_dev(self, "failed to start CPU\n");
    126 			return;
    127 		}
    128 
    129 		sev();
    130 
    131 		for (u_int i = 0x10000000; i > 0; i--) {
    132 			if (cpu_hatched_p(cpuindex))
    133 				 break;
    134 		}
    135 	}
    136 #endif /* MULTIPROCESSOR */
    137 
    138 	/* Assume that less efficient processors are faster. */
    139 	prop_dictionary_set_uint32(dict, "capacity_dmips_mhz",
    140 	    gicc->EfficiencyClass);
    141 
    142 	/* Store the ACPI Processor UID in cpu_info */
    143 	ci->ci_acpiid = gicc->Uid;
    144 
    145 	/* Scan SRAT for NUMA info. */
    146 	if (cpu_mpidr_aff_read() == mpidr) {
    147 		acpisrat_init();
    148 	}
    149 	node = acpisrat_get_node(gicc->Uid);
    150 	if (node != NULL) {
    151 		ci->ci_numa_id = node->nodeid;
    152 	}
    153 
    154 	/* Attach the CPU */
    155 	cpu_attach(self, mpidr);
    156 
    157 	/* Probe for low-power idle states. */
    158 	cpu_acpi_probe_lpi(self, ci);
    159 
    160 #if NTPROF > 0
    161 	if (cpu_mpidr_aff_read() == mpidr && armv8_pmu_detect())
    162 		config_interrupts(self, cpu_acpi_tprof_init);
    163 #endif
    164 }
    165 
    166 static void
    167 cpu_acpi_probe_lpi(device_t dev, struct cpu_info *ci)
    168 {
    169 	ACPI_HANDLE hdl;
    170 	ACPI_BUFFER buf;
    171 	ACPI_OBJECT *obj, *lpi;
    172 	ACPI_STATUS rv;
    173 	uint32_t levelid;
    174 	uint32_t numlpi;
    175 	uint32_t n;
    176 	int enable_lpi;
    177 
    178 	if (get_bootconf_option(boot_args, "nolpi",
    179 				BOOTOPT_TYPE_BOOLEAN, &enable_lpi) &&
    180 	    !enable_lpi) {
    181 		return;
    182 	}
    183 
    184 	hdl = acpi_match_cpu_info(ci);
    185 	if (hdl == NULL) {
    186 		return;
    187 	}
    188 	rv = AcpiGetHandle(hdl, "_LPI", &hdl);
    189 	if (ACPI_FAILURE(rv)) {
    190 		return;
    191 	}
    192 	rv = acpi_eval_struct(hdl, NULL, &buf);
    193 	if (ACPI_FAILURE(rv)) {
    194 		return;
    195 	}
    196 
    197 	obj = buf.Pointer;
    198 	if (obj->Type != ACPI_TYPE_PACKAGE ||
    199 	    obj->Package.Count < 3 ||
    200 	    obj->Package.Elements[1].Type != ACPI_TYPE_INTEGER ||
    201 	    obj->Package.Elements[2].Type != ACPI_TYPE_INTEGER) {
    202 		goto out;
    203 	}
    204 	levelid = obj->Package.Elements[1].Integer.Value;
    205 	if (levelid != 0) {
    206 		/* We depend on platform coordination for now. */
    207 		goto out;
    208 	}
    209 	numlpi = obj->Package.Elements[2].Integer.Value;
    210 	if (obj->Package.Count < 3 + numlpi || numlpi == 0) {
    211 		goto out;
    212 	}
    213 	ci->ci_lpi = kmem_zalloc(sizeof(*ci->ci_lpi) * numlpi, KM_SLEEP);
    214 	for (n = 0; n < numlpi; n++) {
    215 		lpi = &obj->Package.Elements[3 + n];
    216 		if (lpi->Type != ACPI_TYPE_PACKAGE ||
    217 		    lpi->Package.Count < 10 ||
    218 		    lpi->Package.Elements[0].Type != ACPI_TYPE_INTEGER ||
    219 		    lpi->Package.Elements[1].Type != ACPI_TYPE_INTEGER ||
    220 		    lpi->Package.Elements[2].Type != ACPI_TYPE_INTEGER ||
    221 		    lpi->Package.Elements[3].Type != ACPI_TYPE_INTEGER ||
    222 		    !(lpi->Package.Elements[6].Type == ACPI_TYPE_BUFFER ||
    223 		      lpi->Package.Elements[6].Type == ACPI_TYPE_INTEGER)) {
    224 			continue;
    225 		}
    226 
    227 		if ((lpi->Package.Elements[2].Integer.Value & 1) == 0) {
    228 			/* LPI state is not enabled */
    229 			continue;
    230 		}
    231 
    232 		ci->ci_lpi[ci->ci_nlpi].min_res
    233 		    = lpi->Package.Elements[0].Integer.Value;
    234 		ci->ci_lpi[ci->ci_nlpi].wakeup_latency =
    235 		    lpi->Package.Elements[1].Integer.Value;
    236 		ci->ci_lpi[ci->ci_nlpi].save_restore_flags =
    237 		    lpi->Package.Elements[3].Integer.Value;
    238 		if (ci->ci_lpi[ci->ci_nlpi].save_restore_flags != 0) {
    239 			/* Not implemented yet */
    240 			continue;
    241 		}
    242 		if (lpi->Package.Elements[6].Type == ACPI_TYPE_INTEGER) {
    243 			ci->ci_lpi[ci->ci_nlpi].reg_addr =
    244 			    lpi->Package.Elements[6].Integer.Value;
    245 		} else {
    246 			ACPI_GENERIC_ADDRESS addr;
    247 
    248 			KASSERT(lpi->Package.Elements[6].Type ==
    249 				ACPI_TYPE_BUFFER);
    250 
    251 			if (lpi->Package.Elements[6].Buffer.Length <
    252 			    sizeof(AML_RESOURCE_GENERIC_REGISTER)) {
    253 				continue;
    254 			}
    255 			memcpy(&addr, lpi->Package.Elements[6].Buffer.Pointer +
    256 			    sizeof(AML_RESOURCE_LARGE_HEADER), sizeof(addr));
    257 			ci->ci_lpi[ci->ci_nlpi].reg_addr = addr.Address;
    258 		}
    259 
    260 		if (lpi->Package.Elements[9].Type == ACPI_TYPE_STRING) {
    261 			ci->ci_lpi[ci->ci_nlpi].name =
    262 			    kmem_asprintf("LPI state %s",
    263 				lpi->Package.Elements[9].String.Pointer);
    264 		} else {
    265 			ci->ci_lpi[ci->ci_nlpi].name =
    266 			    kmem_asprintf("LPI state %u", n + 1);
    267 		}
    268 
    269 		aprint_verbose_dev(ci->ci_dev,
    270 		    "%s: min res %u, wakeup latency %u, flags %#x, "
    271 		    "register %#x\n",
    272 		    ci->ci_lpi[ci->ci_nlpi].name,
    273 		    ci->ci_lpi[ci->ci_nlpi].min_res,
    274 		    ci->ci_lpi[ci->ci_nlpi].wakeup_latency,
    275 		    ci->ci_lpi[ci->ci_nlpi].save_restore_flags,
    276 		    ci->ci_lpi[ci->ci_nlpi].reg_addr);
    277 
    278 		evcnt_attach_dynamic(&ci->ci_lpi[ci->ci_nlpi].events,
    279 		    EVCNT_TYPE_MISC, NULL, ci->ci_cpuname,
    280 		    ci->ci_lpi[ci->ci_nlpi].name);
    281 
    282 		ci->ci_nlpi++;
    283 	}
    284 
    285 	if (ci->ci_nlpi > 0) {
    286 		extern void (*arm_cpu_idle)(void);
    287 		arm_cpu_idle = cpu_acpi_lpi_idle;
    288 	}
    289 
    290 out:
    291 	ACPI_FREE(buf.Pointer);
    292 }
    293 
    294 static inline void
    295 cpu_acpi_idle(uint32_t addr)
    296 {
    297 	if (addr == LPI_REG_ADDR_WFI) {
    298 		asm volatile("dsb sy; wfi");
    299 	} else {
    300 		psci_cpu_suspend(addr);
    301 	}
    302 }
    303 
    304 void
    305 cpu_acpi_lpi_idle(void)
    306 {
    307 	struct cpu_info *ci = curcpu();
    308 	struct timeval start, end;
    309 	int n;
    310 
    311 	DISABLE_INTERRUPT();
    312 
    313 	microuptime(&start);
    314 	for (n = ci->ci_nlpi - 1; n >= 0; n--) {
    315 		if (ci->ci_last_idle >
    316 		    LPI_IDLE_FACTOR * ci->ci_lpi[n].min_res) {
    317 			cpu_acpi_idle(ci->ci_lpi[n].reg_addr);
    318 			ci->ci_lpi[n].events.ev_count++;
    319 			break;
    320 		}
    321 	}
    322 	if (n == -1) {
    323 		/* Nothing in _LPI, let's just WFI. */
    324 		cpu_acpi_idle(LPI_REG_ADDR_WFI);
    325 	}
    326 	microuptime(&end);
    327 	timersub(&end, &start, &end);
    328 
    329 	ci->ci_last_idle = end.tv_sec * 1000000 + end.tv_usec;
    330 
    331 	ENABLE_INTERRUPT();
    332 }
    333 
    334 #if NTPROF > 0
    335 static struct cpu_info *
    336 cpu_acpi_find_processor(UINT32 uid)
    337 {
    338 	CPU_INFO_ITERATOR cii;
    339 	struct cpu_info *ci;
    340 
    341 	for (CPU_INFO_FOREACH(cii, ci)) {
    342 		if (ci->ci_acpiid == uid)
    343 			return ci;
    344 	}
    345 
    346 	return NULL;
    347 }
    348 
    349 static ACPI_STATUS
    350 cpu_acpi_tprof_intr_establish(ACPI_SUBTABLE_HEADER *hdrp, void *aux)
    351 {
    352 	device_t dev = aux;
    353 	ACPI_MADT_GENERIC_INTERRUPT *gicc;
    354 	struct cpu_info *ci;
    355 	char xname[16];
    356 	kcpuset_t *set;
    357 	int error;
    358 	void *ih;
    359 
    360 	if (hdrp->Type != ACPI_MADT_TYPE_GENERIC_INTERRUPT)
    361 		return AE_OK;
    362 
    363 	gicc = (ACPI_MADT_GENERIC_INTERRUPT *)hdrp;
    364 	if ((gicc->Flags & ACPI_MADT_ENABLED) == 0)
    365 		return AE_OK;
    366 
    367 	const bool cpu_primary_p = cpu_info_store[0].ci_cpuid == gicc->ArmMpidr;
    368 	const bool intr_ppi_p = gicc->PerformanceInterrupt < 32;
    369 	const int type = (gicc->Flags & ACPI_MADT_PERFORMANCE_IRQ_MODE) ?
    370 	    IST_EDGE : IST_LEVEL;
    371 
    372 	if (intr_ppi_p && !cpu_primary_p)
    373 		return AE_OK;
    374 
    375 	ci = cpu_acpi_find_processor(gicc->Uid);
    376 	if (ci == NULL) {
    377 		aprint_error_dev(dev, "couldn't find processor %#x\n",
    378 		    gicc->Uid);
    379 		return AE_OK;
    380 	}
    381 
    382 	if (intr_ppi_p) {
    383 		strlcpy(xname, "pmu", sizeof(xname));
    384 	} else {
    385 		snprintf(xname, sizeof(xname), "pmu %s", cpu_name(ci));
    386 	}
    387 
    388 	ih = intr_establish_xname(gicc->PerformanceInterrupt, IPL_HIGH,
    389 	    type | IST_MPSAFE, armv8_pmu_intr, NULL, xname);
    390 	if (ih == NULL) {
    391 		aprint_error_dev(dev, "couldn't establish %s interrupt\n",
    392 		    xname);
    393 		return AE_OK;
    394 	}
    395 
    396 	if (!intr_ppi_p) {
    397 		kcpuset_create(&set, true);
    398 		kcpuset_set(set, cpu_index(ci));
    399 		error = interrupt_distribute(ih, set, NULL);
    400 		kcpuset_destroy(set);
    401 
    402 		if (error) {
    403 			aprint_error_dev(dev,
    404 			    "failed to distribute %s interrupt: %d\n",
    405 			    xname, error);
    406 			return AE_OK;
    407 		}
    408 	}
    409 
    410 	aprint_normal("%s: PMU interrupting on irq %d\n", cpu_name(ci),
    411 	    gicc->PerformanceInterrupt);
    412 
    413 	return AE_OK;
    414 }
    415 
    416 static void
    417 cpu_acpi_tprof_init(device_t self)
    418 {
    419 	int err = armv8_pmu_init();
    420 	if (err) {
    421 		aprint_error_dev(self,
    422 		    "failed to initialize PMU event counter\n");
    423 		return;
    424 	}
    425 
    426 	if (acpi_madt_map() != AE_OK) {
    427 		aprint_error_dev(self,
    428 		    "failed to map MADT, performance counters not available\n");
    429 		return;
    430 	}
    431 	acpi_madt_walk(cpu_acpi_tprof_intr_establish, self);
    432 	acpi_madt_unmap();
    433 }
    434 #endif
    435