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[60.242.147.73]) by smtp.gmail.com with ESMTPSA id u10sm7010014pfh.123.2021.06.25.19.38.35 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 25 Jun 2021 19:38:36 -0700 (PDT) From: Nicholas Piggin To: skiboot@lists.ozlabs.org Date: Sat, 26 Jun 2021 12:38:16 +1000 Message-Id: <20210626023824.1124164-3-npiggin@gmail.com> X-Mailer: git-send-email 2.23.0 In-Reply-To: <20210626023824.1124164-1-npiggin@gmail.com> References: <20210626023824.1124164-1-npiggin@gmail.com> MIME-Version: 1.0 Subject: [Skiboot] [PATCH 02/10] Introduce hwprobe facility to avoid hard-coding probe functions X-BeenThere: skiboot@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Mailing list for skiboot development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: skiboot-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org Sender: "Skiboot" From: Stewart Smith hwprobe is a little system to have different hardware probing modules run in the dependency order they choose rather than hard coding that order in core/init.c. Signed-off-by: Stewart Smith --- core/Makefile.inc | 1 + core/hwprobe.c | 70 +++++++++++++++++++++++++++++++++++++++++++++++ core/init.c | 3 ++ include/skiboot.h | 39 +++++++++++++++++++++++++- skiboot.lds.S | 6 ++++ 5 files changed, 118 insertions(+), 1 deletion(-) create mode 100644 core/hwprobe.c diff --git a/core/Makefile.inc b/core/Makefile.inc index 829800e5b..f80019b6a 100644 --- a/core/Makefile.inc +++ b/core/Makefile.inc @@ -13,6 +13,7 @@ CORE_OBJS += timer.o i2c.o rtc.o flash.o sensor.o ipmi-opal.o CORE_OBJS += flash-subpartition.o bitmap.o buddy.o pci-quirk.o powercap.o psr.o CORE_OBJS += pci-dt-slot.o direct-controls.o cpufeatures.o CORE_OBJS += flash-firmware-versions.o opal-dump.o +CORE_OBJS += hwprobe.o ifeq ($(SKIBOOT_GCOV),1) CORE_OBJS += gcov-profiling.o diff --git a/core/hwprobe.c b/core/hwprobe.c new file mode 100644 index 000000000..de331af48 --- /dev/null +++ b/core/hwprobe.c @@ -0,0 +1,70 @@ +// SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later +/* Copyright 2021 Stewart Smith */ + +#define pr_fmt(fmt) "HWPROBE: " fmt +#include +#include + +static bool hwprobe_deps_satisfied(const struct hwprobe *hwp) +{ + struct hwprobe *hwprobe; + const char *dep; + unsigned int i; + + if (hwp->deps == NULL) + return true; + + dep = hwp->deps[0]; + + prlog(PR_TRACE, "Checking deps for %s\n", hwp->name); + + while (dep != NULL) { + prlog(PR_TRACE, "Checking %s dep %s\n", hwp->name, dep); + hwprobe = &__hwprobes_start; + for (i = 0; &hwprobe[i] < &__hwprobes_end; i++) { + if(strcmp(hwprobe[i].name,dep) == 0 && + !hwprobe[i].probed) + return false; + } + dep++; + } + + prlog(PR_TRACE, "deps for %s are satisfied!\n", hwp->name); + return true; + +} + +void probe_hardware(void) +{ + struct hwprobe *hwprobe; + unsigned int i; + bool work_todo = true; + bool did_something = true; + + while (work_todo) { + work_todo = false; + did_something = false; + hwprobe = &__hwprobes_start; + prlog(PR_DEBUG, "Begin loop\n"); + for (i = 0; &hwprobe[i] < &__hwprobes_end; i++) { + if (hwprobe[i].probed) + continue; + if (hwprobe_deps_satisfied(&hwprobe[i])) { + prlog(PR_DEBUG, "Probing %s...\n", hwprobe[i].name); + if (hwprobe[i].probe) + hwprobe[i].probe(); + did_something = true; + hwprobe[i].probed = true; + } else { + prlog(PR_DEBUG, "Dependencies for %s not yet satisfied, skipping\n", + hwprobe[i].name); + work_todo = true; + } + } + + if (work_todo && !did_something) { + prlog(PR_ERR, "Cannot satisfy dependencies! Bailing out\n"); + break; + } + } +} diff --git a/core/init.c b/core/init.c index d5ba67edd..ed3229172 100644 --- a/core/init.c +++ b/core/init.c @@ -1333,6 +1333,9 @@ void __noreturn __nomcount main_cpu_entry(const void *fdt) probe_npu2(); probe_npu3(); + /* Probe all HWPROBE hardware we have code linked for*/ + probe_hardware(); + /* Initialize PCI */ pci_init_slots(); diff --git a/include/skiboot.h b/include/skiboot.h index 331aa9501..d104c7a89 100644 --- a/include/skiboot.h +++ b/include/skiboot.h @@ -1,5 +1,7 @@ // SPDX-License-Identifier: Apache-2.0 OR GPL-2.0-or-later -/* Copyright 2013-2019 IBM Corp. */ +/* Copyright 2013-2019 IBM Corp. + * Copyright 2021 Stewart Smith + */ #ifndef __SKIBOOT_H #define __SKIBOOT_H @@ -342,4 +344,39 @@ extern int fake_nvram_info(uint32_t *total_size); extern int fake_nvram_start_read(void *dst, uint32_t src, uint32_t len); extern int fake_nvram_write(uint32_t offset, void *src, uint32_t size); +/* + * A bunch of hardware needs to be probed, sometimes in a particular order. + * Very simple dependency graph, with a even simpler way to resolve it. + * But it means we can now at link time choose what hardware we support. + * This struct should not be defined directly but with the macros. + */ +struct hwprobe { + const char *name; + void (*probe)(void); + + bool probed; + + /* NULL or NULL-terminated array of strings */ + const char **deps; +}; + +#define DEFINE_HWPROBE(__name, __probe) \ +static const struct hwprobe __used __section(".hwprobes") hwprobe_##__name = { \ + .name = #__name, \ + .probe = __probe, \ + .deps = NULL, \ +} + +#define DEFINE_HWPROBE_DEPS(__name, __probe, ...) \ +static const struct hwprobe __used __section(".hwprobes") hwprobe_##__name = { \ + .name = #__name, \ + .probe = __probe, \ + .deps = (const char *[]){ __VA_ARGS__, NULL}, \ +} + +extern struct hwprobe __hwprobes_start; +extern struct hwprobe __hwprobes_end; + +extern void probe_hardware(void); + #endif /* __SKIBOOT_H */ diff --git a/skiboot.lds.S b/skiboot.lds.S index 5a7f9e316..c8e6e747c 100644 --- a/skiboot.lds.S +++ b/skiboot.lds.S @@ -164,6 +164,12 @@ SECTIONS __platforms_end = .; } + .hwprobes : { + __hwprobes_start = .; + KEEP(*(.hwprobes)) + __hwprobes_end = .; + } + /* Relocations */ . = ALIGN(0x10); .dynamic : {