From: "Rafael J. Wysocki" <rjw@rjwysocki.net>
To: "Russell King (Oracle)" <linux@armlinux.org.uk>,
Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: "Rafael J. Wysocki" <rafael@kernel.org>,
linux-pm@vger.kernel.org, loongarch@lists.linux.dev,
linux-acpi@vger.kernel.org, linux-arch@vger.kernel.org,
linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-riscv@lists.infradead.org, kvmarm@lists.linux.dev,
x86@kernel.org, acpica-devel@lists.linuxfoundation.org,
linux-csky@vger.kernel.org, linux-doc@vger.kernel.org,
linux-ia64@vger.kernel.org, linux-parisc@vger.kernel.org,
Salil Mehta <salil.mehta@huawei.com>,
Jean-Philippe Brucker <jean-philippe@linaro.org>,
jianyong.wu@arm.com, justin.he@arm.com,
James Morse <james.morse@arm.com>
Subject: Re: [PATCH RFC v3 01/21] ACPI: Only enumerate enabled (or functional) devices
Date: Fri, 15 Dec 2023 20:47:31 +0100 [thread overview]
Message-ID: <5760569.DvuYhMxLoT@kreacher> (raw)
In-Reply-To: <20231215161539.00000940@Huawei.com>
On Friday, December 15, 2023 5:15:39 PM CET Jonathan Cameron wrote:
> On Fri, 15 Dec 2023 15:31:55 +0000
> "Russell King (Oracle)" <linux@armlinux.org.uk> wrote:
>
> > On Thu, Dec 14, 2023 at 07:37:10PM +0100, Rafael J. Wysocki wrote:
> > > On Thu, Dec 14, 2023 at 7:16 PM Rafael J. Wysocki <rafael@kernel.org> wrote:
> > > >
> > > > On Thu, Dec 14, 2023 at 7:10 PM Russell King (Oracle)
> > > > <linux@armlinux.org.uk> wrote:
> > > > > I guess we need something like:
> > > > >
> > > > > if (device->status.present)
> > > > > return device->device_type != ACPI_BUS_TYPE_PROCESSOR ||
> > > > > device->status.enabled;
> > > > > else
> > > > > return device->status.functional;
> > > > >
> > > > > so we only check device->status.enabled for processor-type devices?
> > > >
> > > > Yes, something like this.
> > >
> > > However, that is not sufficient, because there are
> > > ACPI_BUS_TYPE_DEVICE devices representing processors.
> > >
> > > I'm not sure about a clean way to do it ATM.
> >
> > Ok, how about:
> >
> > static bool acpi_dev_is_processor(const struct acpi_device *device)
> > {
> > struct acpi_hardware_id *hwid;
> >
> > if (device->device_type == ACPI_BUS_TYPE_PROCESSOR)
> > return true;
> >
> > if (device->device_type != ACPI_BUS_TYPE_DEVICE)
> > return false;
> >
> > list_for_each_entry(hwid, &device->pnp.ids, list)
> > if (!strcmp(ACPI_PROCESSOR_OBJECT_HID, hwid->id) ||
> > !strcmp(ACPI_PROCESSOR_DEVICE_HID, hwid->id))
> > return true;
> >
> > return false;
> > }
> >
> > and then:
> >
> > if (device->status.present)
> > return !acpi_dev_is_processor(device) || device->status.enabled;
> > else
> > return device->status.functional;
> >
> > ?
> >
> Changing it to CPU only for now makes sense to me and I think this code snippet should do the
> job. Nice and simple.
Well, except that it does checks that are done elsewhere slightly
differently, which from the maintenance POV is not nice.
Maybe something like the appended patch (untested).
---
drivers/acpi/acpi_processor.c | 11 +++++++++++
drivers/acpi/internal.h | 3 +++
drivers/acpi/scan.c | 24 +++++++++++++++++++++++-
3 files changed, 37 insertions(+), 1 deletion(-)
Index: linux-pm/drivers/acpi/acpi_processor.c
===================================================================
--- linux-pm.orig/drivers/acpi/acpi_processor.c
+++ linux-pm/drivers/acpi/acpi_processor.c
@@ -644,6 +644,17 @@ static struct acpi_scan_handler processo
},
};
+bool acpi_device_is_processor(const struct acpi_device *adev)
+{
+ if (adev->device_type == ACPI_BUS_TYPE_PROCESSOR)
+ return true;
+
+ if (adev->device_type != ACPI_BUS_TYPE_DEVICE)
+ return false;
+
+ return acpi_scan_check_handler(adev, &processor_handler);
+}
+
static int acpi_processor_container_attach(struct acpi_device *dev,
const struct acpi_device_id *id)
{
Index: linux-pm/drivers/acpi/internal.h
===================================================================
--- linux-pm.orig/drivers/acpi/internal.h
+++ linux-pm/drivers/acpi/internal.h
@@ -62,6 +62,8 @@ void acpi_sysfs_add_hotplug_profile(stru
int acpi_scan_add_handler_with_hotplug(struct acpi_scan_handler *handler,
const char *hotplug_profile_name);
void acpi_scan_hotplug_enabled(struct acpi_hotplug_profile *hotplug, bool val);
+bool acpi_scan_check_handler(const struct acpi_device *adev,
+ struct acpi_scan_handler *handler);
#ifdef CONFIG_DEBUG_FS
extern struct dentry *acpi_debugfs_dir;
@@ -133,6 +135,7 @@ int acpi_bus_register_early_device(int t
const struct acpi_device *acpi_companion_match(const struct device *dev);
int __acpi_device_uevent_modalias(const struct acpi_device *adev,
struct kobj_uevent_env *env);
+bool acpi_device_is_processor(const struct acpi_device *adev);
/* --------------------------------------------------------------------------
Power Resource
Index: linux-pm/drivers/acpi/scan.c
===================================================================
--- linux-pm.orig/drivers/acpi/scan.c
+++ linux-pm/drivers/acpi/scan.c
@@ -1938,6 +1938,19 @@ static bool acpi_scan_handler_matching(s
return false;
}
+bool acpi_scan_check_handler(const struct acpi_device *adev,
+ struct acpi_scan_handler *handler)
+{
+ struct acpi_hardware_id *hwid;
+
+ list_for_each_entry(hwid, &adev->pnp.ids, list) {
+ if (acpi_scan_handler_matching(handler, hwid->id, NULL))
+ return true;
+ }
+
+ return false;
+}
+
static struct acpi_scan_handler *acpi_scan_match_handler(const char *idstr,
const struct acpi_device_id **matchid)
{
@@ -2410,7 +2423,16 @@ bool acpi_dev_ready_for_enumeration(cons
if (device->flags.honor_deps && device->dep_unmet)
return false;
- return acpi_device_is_present(device);
+ if (device->status.functional)
+ return true;
+
+ if (!device->status.present)
+ return false;
+
+ if (device->status.enabled)
+ return true; /* Fast path. */
+
+ return !acpi_device_is_processor(device);
}
EXPORT_SYMBOL_GPL(acpi_dev_ready_for_enumeration);
next prev parent reply other threads:[~2023-12-15 19:47 UTC|newest]
Thread overview: 121+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-12-13 12:47 [RFC PATCH v3 00/21] ACPI/arm64: add support for virtual cpu hotplug Russell King (Oracle)
2023-12-13 12:49 ` [PATCH RFC v3 01/21] ACPI: Only enumerate enabled (or functional) devices Russell King
2023-12-14 17:32 ` Jonathan Cameron
2023-12-14 17:47 ` Rafael J. Wysocki
2023-12-14 18:10 ` Russell King (Oracle)
2023-12-14 18:16 ` Rafael J. Wysocki
2023-12-14 18:37 ` Rafael J. Wysocki
2023-12-15 15:31 ` Russell King (Oracle)
2023-12-15 16:15 ` Jonathan Cameron
2023-12-15 19:47 ` Rafael J. Wysocki [this message]
2024-01-02 14:39 ` Jonathan Cameron
2024-01-11 10:19 ` Jonathan Cameron
2024-01-11 10:26 ` Russell King (Oracle)
2024-01-12 11:52 ` Jonathan Cameron
2024-01-29 14:55 ` Russell King (Oracle)
2024-01-29 15:05 ` Rafael J. Wysocki
2024-01-29 15:16 ` Russell King (Oracle)
2024-01-29 15:34 ` Rafael J. Wysocki
2024-01-22 7:31 ` Gavin Shan
2023-12-14 17:55 ` Russell King (Oracle)
2023-12-13 12:49 ` [PATCH RFC v3 02/21] ACPI: processor: Add support for processors described as container packages Russell King
2023-12-14 17:36 ` Jonathan Cameron
2023-12-14 17:57 ` Russell King (Oracle)
2023-12-18 20:17 ` Rafael J. Wysocki
2024-01-09 15:49 ` Russell King (Oracle)
2024-01-09 16:05 ` Rafael J. Wysocki
2024-01-09 16:13 ` Russell King (Oracle)
2024-01-11 16:17 ` Jonathan Cameron
2024-01-11 17:59 ` Jonathan Cameron
2024-01-11 18:46 ` Russell King (Oracle)
2024-01-12 9:25 ` Jonathan Cameron
2024-01-12 15:01 ` Rafael J. Wysocki
2024-01-12 15:03 ` Jonathan Cameron
2024-01-15 10:47 ` Russell King (Oracle)
2023-12-13 12:49 ` [PATCH RFC v3 03/21] ACPI: processor: Register CPUs that are online, but not described in the DSDT Russell King
2023-12-18 20:22 ` Rafael J. Wysocki
2024-01-15 11:06 ` Russell King (Oracle)
2024-01-22 16:02 ` Jonathan Cameron
2024-01-22 16:22 ` Rafael J. Wysocki
2024-01-22 17:30 ` Russell King (Oracle)
2024-01-23 9:27 ` Jonathan Cameron
2024-01-25 13:56 ` Miguel Luis
2024-01-25 14:42 ` Rafael J. Wysocki
2024-01-29 13:03 ` Jonathan Cameron
2024-01-29 15:32 ` Russell King (Oracle)
2024-01-22 17:27 ` Russell King (Oracle)
2023-12-13 12:49 ` [PATCH RFC v3 04/21] ACPI: processor: Register all CPUs from acpi_processor_get_info() Russell King
2023-12-14 17:38 ` Jonathan Cameron
2023-12-18 20:30 ` Rafael J. Wysocki
2024-01-22 17:44 ` Jonathan Cameron
2024-01-22 18:03 ` Rafael J. Wysocki
2024-01-22 21:56 ` Russell King (Oracle)
2023-12-13 12:49 ` [PATCH RFC v3 05/21] ACPI: Rename ACPI_HOTPLUG_CPU to include 'present' Russell King
2023-12-14 17:41 ` Jonathan Cameron
2023-12-14 18:00 ` Russell King (Oracle)
2023-12-18 20:35 ` Rafael J. Wysocki
2024-01-22 18:00 ` Jonathan Cameron
2024-01-23 13:28 ` Russell King (Oracle)
2024-01-23 16:15 ` Rafael J. Wysocki
2024-01-23 16:36 ` Russell King (Oracle)
2024-01-23 17:43 ` Rafael J. Wysocki
2024-01-23 18:19 ` Russell King (Oracle)
2024-01-23 18:26 ` Rafael J. Wysocki
2024-01-23 18:59 ` Russell King (Oracle)
2024-01-23 19:27 ` Rafael J. Wysocki
2024-01-23 20:09 ` Russell King (Oracle)
2024-01-23 20:17 ` Rafael J. Wysocki
2024-01-23 20:57 ` Russell King (Oracle)
2024-01-23 21:12 ` Russell King (Oracle)
2024-01-23 22:05 ` Rafael J. Wysocki
2024-01-24 8:45 ` Russell King (Oracle)
2023-12-13 12:49 ` [PATCH RFC v3 06/21] ACPI: Move acpi_bus_trim_one() before acpi_scan_hot_remove() Russell King
2023-12-13 12:49 ` [PATCH RFC v3 07/21] ACPI: Rename acpi_processor_hotadd_init and remove pre-processor guards Russell King
2023-12-14 17:43 ` Jonathan Cameron
2023-12-14 18:03 ` Russell King (Oracle)
2023-12-13 12:49 ` [PATCH RFC v3 08/21] ACPI: Add post_eject to struct acpi_scan_handler for cpu hotplug Russell King
2023-12-13 12:49 ` [PATCH RFC v3 09/21] ACPI: convert acpi_processor_post_eject() to use IS_ENABLED() Russell King (Oracle)
2023-12-15 16:11 ` Jonathan Cameron
2023-12-13 12:50 ` [PATCH RFC v3 10/21] ACPI: Check _STA present bit before making CPUs not present Russell King
2023-12-15 16:18 ` Jonathan Cameron
2023-12-13 12:50 ` [PATCH RFC v3 11/21] ACPI: Warn when the present bit changes but the feature is not enabled Russell King
2023-12-13 12:50 ` [PATCH RFC v3 12/21] arm64: acpi: Move get_cpu_for_acpi_id() to a header Russell King
2023-12-13 12:50 ` [PATCH RFC v3 13/21] ACPICA: Add new MADT GICC flags fields Russell King
2023-12-15 16:23 ` Jonathan Cameron
2023-12-15 16:53 ` Russell King (Oracle)
2023-12-18 9:23 ` Lorenzo Pieralisi
2023-12-18 13:14 ` Rafael J. Wysocki
2023-12-18 16:28 ` Lorenzo Pieralisi
2023-12-27 11:15 ` Lorenzo Pieralisi
2023-12-13 12:50 ` [PATCH RFC v3 14/21] irqchip/gic-v3: Don't return errors from gic_acpi_match_gicc() Russell King
2023-12-15 16:33 ` Jonathan Cameron
2024-01-09 19:27 ` Russell King (Oracle)
2024-01-23 10:08 ` Jonathan Cameron
2023-12-13 12:50 ` [PATCH RFC v3 15/21] irqchip/gic-v3: Add support for ACPI's disabled but 'online capable' CPUs Russell King
2023-12-15 16:38 ` Jonathan Cameron
2023-12-13 12:50 ` [PATCH RFC v3 16/21] arm64: psci: Ignore DENIED CPUs Russell King
2023-12-15 16:40 ` Jonathan Cameron
2023-12-13 12:50 ` [PATCH RFC v3 17/21] ACPI: add support to register CPUs based on the _STA enabled bit Russell King
2023-12-18 13:03 ` Russell King (Oracle)
2024-01-02 14:53 ` Jonathan Cameron
2024-01-23 10:26 ` Jonathan Cameron
2024-01-23 13:10 ` Russell King (Oracle)
2024-01-23 14:22 ` Jonathan Cameron
2024-01-23 14:59 ` Russell King (Oracle)
2023-12-13 12:50 ` [PATCH RFC v3 18/21] ACPI: processor: Only call arch_unregister_cpu() if HOTPLUG_CPU is selected Russell King
2023-12-15 16:50 ` Jonathan Cameron
2023-12-18 12:58 ` Russell King (Oracle)
2024-01-23 10:29 ` Jonathan Cameron
2023-12-13 12:50 ` [PATCH RFC v3 19/21] arm64: document virtual CPU hotplug's expectations Russell King
2023-12-15 17:04 ` Jonathan Cameron
2023-12-13 12:50 ` [PATCH RFC v3 20/21] ACPI: Add _OSC bits to advertise OS support for toggling CPU present/enabled Russell King
2023-12-15 17:12 ` Jonathan Cameron
2024-01-02 13:07 ` Jose Marinho
2024-01-02 15:16 ` Jonathan Cameron
2024-01-02 15:35 ` Jose Marinho
2024-01-23 10:51 ` Jonathan Cameron
2023-12-13 12:50 ` [PATCH RFC v3 21/21] cpumask: Add enabled cpumask for present CPUs that can be brought online Russell King
2023-12-15 17:18 ` Jonathan Cameron
2023-12-18 12:14 ` Russell King (Oracle)
2024-01-02 15:19 ` Jonathan Cameron
2023-12-15 19:40 ` Thomas Gleixner
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