Date: Tue, 9 Jan 2024 19:29:02 GMT From: John Baldwin <jhb@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-main@FreeBSD.org Subject: git: c6a488511ab1 - main - acpi: Only reserve resources enumerated via _CRS Message-ID: <202401091929.409JT2F2032972@gitrepo.freebsd.org>
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The branch main has been updated by jhb: URL: https://cgit.FreeBSD.org/src/commit/?id=c6a488511ab1fbae8d16264b9e83c85024c9e1ce commit c6a488511ab1fbae8d16264b9e83c85024c9e1ce Author: John Baldwin <jhb@FreeBSD.org> AuthorDate: 2024-01-09 19:23:10 +0000 Commit: John Baldwin <jhb@FreeBSD.org> CommitDate: 2024-01-09 19:23:10 +0000 acpi: Only reserve resources enumerated via _CRS In particular, don't reserve resources added by drivers via other means (e.g. acpi_bus_alloc_gas which calls bus_alloc_resource right after adding the resource). The intention of reserved resources is to ensure that a resource range that a bus driver knows is assigned to a device is reserved by the system even if no driver is attached to the device. This prevents other "wildcard" resource requests from conflicting with these resources. For ACPI, the only resources the bus driver knows about for unattached devices are the resources returned from _CRS. All of these resources are already reserved now via acpi_reserve_resources called from acpi_probe_children. As such, remove the logic from acpi_set_resource to try to reserve resources when they are set. This permits RF_SHAREABLE to work with acpi_bus_alloc_gas without requiring hacks like the current one for CPU device resources in acpi_set_resource. Reported by: gallatin (RF_SHAREABLE not working) Diagnosed by: jrtc27 --- sys/dev/acpica/acpi.c | 36 ------------------------------------ sys/dev/acpica/acpivar.h | 1 - 2 files changed, 37 deletions(-) diff --git a/sys/dev/acpica/acpi.c b/sys/dev/acpica/acpi.c index 22d2b10ff905..9196c446ae80 100644 --- a/sys/dev/acpica/acpi.c +++ b/sys/dev/acpica/acpi.c @@ -1376,11 +1376,9 @@ acpi_reserve_resources(device_t dev) struct resource_list_entry *rle; struct resource_list *rl; struct acpi_device *ad; - struct acpi_softc *sc; device_t *children; int child_count, i; - sc = device_get_softc(dev); if (device_get_children(dev, &children, &child_count) != 0) return; for (i = 0; i < child_count; i++) { @@ -1422,14 +1420,12 @@ acpi_reserve_resources(device_t dev) } } free(children, M_TEMP); - sc->acpi_resources_reserved = 1; } static int acpi_set_resource(device_t dev, device_t child, int type, int rid, rman_res_t start, rman_res_t count) { - struct acpi_softc *sc = device_get_softc(dev); struct acpi_device *ad = device_get_ivars(child); struct resource_list *rl = &ad->ad_rl; ACPI_DEVICE_INFO *devinfo; @@ -1485,38 +1481,6 @@ acpi_set_resource(device_t dev, device_t child, int type, int rid, /* Add the resource. */ end = (start + count - 1); resource_list_add(rl, type, rid, start, end, count); - - /* Don't reserve resources until the system resources are allocated. */ - if (!sc->acpi_resources_reserved) - return (0); - - /* Don't reserve system resources. */ - if (ACPI_ID_PROBE(dev, child, sysres_ids, NULL) <= 0) - return (0); - - /* - * Don't reserve IRQ resources. There are many sticky things to - * get right otherwise (e.g. IRQs for psm, atkbd, and HPET when - * using legacy routing). - */ - if (type == SYS_RES_IRQ) - return (0); - - /* - * Don't reserve resources for CPU devices. Some of these - * resources need to be allocated as shareable, but reservations - * are always non-shareable. - */ - if (device_get_devclass(child) == devclass_find("cpu")) - return (0); - - /* - * Reserve the resource. - * - * XXX: Ignores failure for now. Failure here is probably a - * BIOS/firmware bug? - */ - resource_list_reserve(rl, dev, child, type, &rid, start, end, count, 0); return (0); } diff --git a/sys/dev/acpica/acpivar.h b/sys/dev/acpica/acpivar.h index 5be0939ee6bb..4d76a77cdbf8 100644 --- a/sys/dev/acpica/acpivar.h +++ b/sys/dev/acpica/acpivar.h @@ -55,7 +55,6 @@ struct acpi_softc { int acpi_enabled; int acpi_sstate; int acpi_sleep_disabled; - int acpi_resources_reserved; struct sysctl_ctx_list acpi_sysctl_ctx; struct sysctl_oid *acpi_sysctl_tree;
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