5e76c73c82
Changes:
- Rebase onto v5.10.66
Links:
- kernel: 459bd42a63
471 lines
16 KiB
Diff
471 lines
16 KiB
Diff
From f255f201f64e16da9651393a9906956d6dcc89d7 Mon Sep 17 00:00:00 2001
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From: Maximilian Luz <luzmaximilian@gmail.com>
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Date: Sat, 31 Oct 2020 20:46:33 +0100
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Subject: [PATCH] PCI: Add sysfs attribute for PCI device power state
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While most PCI power-states can be queried from user-space via lspci,
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this has some limits. Specifically, lspci fails to provide an accurate
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value when the device is in D3cold as it has to resume the device before
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it can access its power state via the configuration space, leading to it
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reporting D0 or another on-state. Thus lspci can, for example, not be
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used to diagnose power-consumption issues for devices that can enter
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D3cold or to ensure that devices properly enter D3cold at all.
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To alleviate this issue, introduce a new sysfs device attribute for the
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PCI power state, showing the current power state as seen by the kernel.
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Signed-off-by: Maximilian Luz <luzmaximilian@gmail.com>
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Patchset: surface-hotplug
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---
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Documentation/ABI/testing/sysfs-bus-pci | 9 +++++++++
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drivers/pci/pci-sysfs.c | 12 ++++++++++++
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2 files changed, 21 insertions(+)
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diff --git a/Documentation/ABI/testing/sysfs-bus-pci b/Documentation/ABI/testing/sysfs-bus-pci
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index 77ad9ec3c801..25c9c39770c6 100644
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--- a/Documentation/ABI/testing/sysfs-bus-pci
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+++ b/Documentation/ABI/testing/sysfs-bus-pci
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@@ -366,3 +366,12 @@ Contact: Heiner Kallweit <hkallweit1@gmail.com>
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Description: If ASPM is supported for an endpoint, these files can be
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used to disable or enable the individual power management
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states. Write y/1/on to enable, n/0/off to disable.
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+
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+What: /sys/bus/pci/devices/.../power_state
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+Date: November 2020
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+Contact: Linux PCI developers <linux-pci@vger.kernel.org>
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+Description:
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+ This file contains the current PCI power state of the device.
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+ The value comes from the PCI kernel device state and can be one
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+ of: "unknown", "error", "D0", D1", "D2", "D3hot", "D3cold".
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+ The file is read only.
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diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
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index d15c881e2e7e..b15f754e6346 100644
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--- a/drivers/pci/pci-sysfs.c
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+++ b/drivers/pci/pci-sysfs.c
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@@ -124,6 +124,17 @@ static ssize_t cpulistaffinity_show(struct device *dev,
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}
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static DEVICE_ATTR_RO(cpulistaffinity);
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+/* PCI power state */
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+static ssize_t power_state_show(struct device *dev,
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+ struct device_attribute *attr, char *buf)
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+{
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+ struct pci_dev *pci_dev = to_pci_dev(dev);
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+ pci_power_t state = READ_ONCE(pci_dev->current_state);
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+
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+ return sprintf(buf, "%s\n", pci_power_name(state));
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+}
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+static DEVICE_ATTR_RO(power_state);
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+
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/* show resources */
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static ssize_t resource_show(struct device *dev, struct device_attribute *attr,
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char *buf)
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@@ -581,6 +592,7 @@ static ssize_t driver_override_show(struct device *dev,
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static DEVICE_ATTR_RW(driver_override);
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static struct attribute *pci_dev_attrs[] = {
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+ &dev_attr_power_state.attr,
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&dev_attr_resource.attr,
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&dev_attr_vendor.attr,
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&dev_attr_device.attr,
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--
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2.33.0
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From cd1bedb6ac1c78f328d474774dcdaabdc385c409 Mon Sep 17 00:00:00 2001
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From: Maximilian Luz <luzmaximilian@gmail.com>
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Date: Mon, 14 Dec 2020 20:50:59 +0100
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Subject: [PATCH] platform/x86: Add Surface Hotplug driver
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Add a driver to handle out-of-band hot-plug signaling for the discrete
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GPU (dGPU) on Microsoft Surface Book 2 and 3 devices. This driver is
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required to properly detect hot-plugging of the dGPU and relay the
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appropriate signal to the PCIe hot-plug driver core.
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Signed-off-by: Maximilian Luz <luzmaximilian@gmail.com>
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Patchset: surface-hotplug
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---
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drivers/platform/x86/Kconfig | 20 ++
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drivers/platform/x86/Makefile | 1 +
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drivers/platform/x86/surface_hotplug.c | 282 +++++++++++++++++++++++++
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3 files changed, 303 insertions(+)
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create mode 100644 drivers/platform/x86/surface_hotplug.c
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diff --git a/drivers/platform/x86/Kconfig b/drivers/platform/x86/Kconfig
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index d44d3fb9ca72..533998040530 100644
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--- a/drivers/platform/x86/Kconfig
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+++ b/drivers/platform/x86/Kconfig
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@@ -1012,6 +1012,26 @@ config SURFACE_GPE
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accordingly. It is required on those devices to allow wake-ups from
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suspend by opening the lid.
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+config SURFACE_HOTPLUG
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+ tristate "Surface Hot-Plug System Driver"
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+ depends on ACPI
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+ default m
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+ help
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+ Driver for out-of-band hot-plug event signaling on Microsoft Surface
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+ devices with hot-pluggable PCIe cards.
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+
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+ This driver is used on Surface Book (2 and 3) devices with a
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+ hot-pluggable discrete GPU (dGPU). When not in use, the dGPU on those
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+ devices can enter D3cold, which prevents in-band (standard) PCIe
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+ hot-plug signaling. Thus, without this driver, detaching the base
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+ containing the dGPU will not correctly update the state of the
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+ corresponding PCIe device if it is in D3cold. This driver adds support
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+ for out-of-band hot-plug notifications, ensuring that the device state
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+ is properly updated even when the device in question is in D3cold.
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+
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+ Select M or Y here, if you want to (fully) support hot-plugging of
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+ dGPU devices on the Surface Book 2 and/or 3 during D3cold.
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+
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config SURFACE_BOOK1_DGPU_SWITCH
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tristate "Surface Book 1 dGPU Switch Driver"
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depends on ACPI && SYSFS
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diff --git a/drivers/platform/x86/Makefile b/drivers/platform/x86/Makefile
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index 2e0a2896c78d..f552cbfb7914 100644
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--- a/drivers/platform/x86/Makefile
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+++ b/drivers/platform/x86/Makefile
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@@ -94,6 +94,7 @@ obj-$(CONFIG_SURFACE_3_BUTTON) += surface3_button.o
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obj-$(CONFIG_SURFACE_3_POWER_OPREGION) += surface3_power.o
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obj-$(CONFIG_SURFACE_PRO3_BUTTON) += surfacepro3_button.o
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obj-$(CONFIG_SURFACE_GPE) += surface_gpe.o
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+obj-$(CONFIG_SURFACE_HOTPLUG) += surface_hotplug.o
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obj-$(CONFIG_SURFACE_BOOK1_DGPU_SWITCH) += sb1_dgpu_sw.o
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# MSI
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diff --git a/drivers/platform/x86/surface_hotplug.c b/drivers/platform/x86/surface_hotplug.c
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new file mode 100644
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index 000000000000..cfcc15cfbacb
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--- /dev/null
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+++ b/drivers/platform/x86/surface_hotplug.c
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@@ -0,0 +1,282 @@
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+// SPDX-License-Identifier: GPL-2.0+
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+/*
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+ * Surface Book (2 and later) hot-plug driver.
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+ *
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+ * Surface Book devices (can) have a hot-pluggable discrete GPU (dGPU). This
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+ * driver is responsible for out-of-band hot-plug event signaling on these
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+ * devices. It is specifically required when the hot-plug device is in D3cold
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+ * and can thus not generate PCIe hot-plug events itself.
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+ *
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+ * Event signaling is handled via ACPI, which will generate the appropriate
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+ * device-check notifications to be picked up by the PCIe hot-plug driver.
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+ *
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+ * Copyright (C) 2019-2021 Maximilian Luz <luzmaximilian@gmail.com>
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+ */
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+
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+#include <linux/acpi.h>
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+#include <linux/gpio.h>
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+#include <linux/interrupt.h>
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+#include <linux/kernel.h>
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+#include <linux/module.h>
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+#include <linux/mutex.h>
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+#include <linux/platform_device.h>
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+
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+static const struct acpi_gpio_params shps_base_presence_int = { 0, 0, false };
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+static const struct acpi_gpio_params shps_base_presence = { 1, 0, false };
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+static const struct acpi_gpio_params shps_device_power_int = { 2, 0, false };
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+static const struct acpi_gpio_params shps_device_power = { 3, 0, false };
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+static const struct acpi_gpio_params shps_device_presence_int = { 4, 0, false };
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+static const struct acpi_gpio_params shps_device_presence = { 5, 0, false };
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+
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+static const struct acpi_gpio_mapping shps_acpi_gpios[] = {
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+ { "base_presence-int-gpio", &shps_base_presence_int, 1 },
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+ { "base_presence-gpio", &shps_base_presence, 1 },
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+ { "device_power-int-gpio", &shps_device_power_int, 1 },
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+ { "device_power-gpio", &shps_device_power, 1 },
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+ { "device_presence-int-gpio", &shps_device_presence_int, 1 },
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+ { "device_presence-gpio", &shps_device_presence, 1 },
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+ { },
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+};
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+
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+/* 5515a847-ed55-4b27-8352-cd320e10360a */
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+static const guid_t shps_dsm_guid =
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+ GUID_INIT(0x5515a847, 0xed55, 0x4b27, 0x83, 0x52, 0xcd, 0x32, 0x0e, 0x10, 0x36, 0x0a);
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+
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+#define SHPS_DSM_REVISION 1
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+
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+enum shps_dsm_fn {
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+ SHPS_DSM_FN_PCI_NUM_ENTRIES = 0x01,
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+ SHPS_DSM_FN_PCI_GET_ENTRIES = 0x02,
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+ SHPS_DSM_FN_IRQ_BASE_PRESENCE = 0x03,
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+ SHPS_DSM_FN_IRQ_DEVICE_POWER = 0x04,
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+ SHPS_DSM_FN_IRQ_DEVICE_PRESENCE = 0x05,
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+};
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+
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+enum shps_irq_type {
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+ /* NOTE: Must be in order of enum shps_dsm_fn above. */
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+ SHPS_IRQ_TYPE_BASE_PRESENCE = 0,
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+ SHPS_IRQ_TYPE_DEVICE_POWER = 1,
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+ SHPS_IRQ_TYPE_DEVICE_PRESENCE = 2,
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+ SHPS_NUM_IRQS,
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+};
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+
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+static const char *const shps_gpio_names[] = {
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+ [SHPS_IRQ_TYPE_BASE_PRESENCE] = "base_presence",
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+ [SHPS_IRQ_TYPE_DEVICE_POWER] = "device_power",
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+ [SHPS_IRQ_TYPE_DEVICE_PRESENCE] = "device_presence",
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+};
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+
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+struct shps_device {
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+ struct mutex lock[SHPS_NUM_IRQS]; /* Protects update in shps_dsm_notify_irq() */
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+ struct gpio_desc *gpio[SHPS_NUM_IRQS];
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+ unsigned int irq[SHPS_NUM_IRQS];
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+};
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+
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+#define SHPS_IRQ_NOT_PRESENT ((unsigned int)-1)
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+
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+static enum shps_dsm_fn shps_dsm_fn_for_irq(enum shps_irq_type type)
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+{
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+ return SHPS_DSM_FN_IRQ_BASE_PRESENCE + type;
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+}
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+
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+static void shps_dsm_notify_irq(struct platform_device *pdev, enum shps_irq_type type)
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+{
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+ struct shps_device *sdev = platform_get_drvdata(pdev);
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+ acpi_handle handle = ACPI_HANDLE(&pdev->dev);
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+ union acpi_object *result;
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+ union acpi_object param;
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+ int value;
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+
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+ mutex_lock(&sdev->lock[type]);
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+
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+ value = gpiod_get_value_cansleep(sdev->gpio[type]);
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+ if (value < 0) {
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+ mutex_unlock(&sdev->lock[type]);
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+ dev_err(&pdev->dev, "failed to get gpio: %d (irq=%d)\n", type, value);
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+ return;
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+ }
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+
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+ dev_dbg(&pdev->dev, "IRQ notification via DSM (irq=%d, value=%d)\n", type, value);
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+
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+ param.type = ACPI_TYPE_INTEGER;
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+ param.integer.value = value;
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+
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+ result = acpi_evaluate_dsm(handle, &shps_dsm_guid, SHPS_DSM_REVISION,
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+ shps_dsm_fn_for_irq(type), ¶m);
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+
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+ if (!result) {
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+ dev_err(&pdev->dev, "IRQ notification via DSM failed (irq=%d, gpio=%d)\n",
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+ type, value);
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+
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+ } else if (result->type != ACPI_TYPE_BUFFER) {
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+ dev_err(&pdev->dev,
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+ "IRQ notification via DSM failed: unexpected result type (irq=%d, gpio=%d)\n",
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+ type, value);
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+
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+ } else if (result->buffer.length != 1 || result->buffer.pointer[0] != 0) {
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+ dev_err(&pdev->dev,
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+ "IRQ notification via DSM failed: unexpected result value (irq=%d, gpio=%d)\n",
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+ type, value);
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+ }
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+
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+ mutex_unlock(&sdev->lock[type]);
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+
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+ if (result)
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+ ACPI_FREE(result);
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+}
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+
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+static irqreturn_t shps_handle_irq(int irq, void *data)
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+{
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+ struct platform_device *pdev = data;
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+ struct shps_device *sdev = platform_get_drvdata(pdev);
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+ int type;
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+
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+ /* Figure out which IRQ we're handling. */
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+ for (type = 0; type < SHPS_NUM_IRQS; type++)
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+ if (irq == sdev->irq[type])
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+ break;
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+
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+ /* We should have found our interrupt, if not: this is a bug. */
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+ if (WARN(type >= SHPS_NUM_IRQS, "invalid IRQ number: %d\n", irq))
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+ return IRQ_HANDLED;
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+
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+ /* Forward interrupt to ACPI via DSM. */
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+ shps_dsm_notify_irq(pdev, type);
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+ return IRQ_HANDLED;
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+}
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+
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+static int shps_setup_irq(struct platform_device *pdev, enum shps_irq_type type)
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+{
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+ unsigned long flags = IRQF_ONESHOT | IRQF_TRIGGER_FALLING | IRQF_TRIGGER_RISING;
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+ struct shps_device *sdev = platform_get_drvdata(pdev);
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+ struct gpio_desc *gpiod;
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+ acpi_handle handle = ACPI_HANDLE(&pdev->dev);
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+ const char *irq_name;
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+ const int dsm = shps_dsm_fn_for_irq(type);
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+ int status, irq;
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+
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+ /*
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+ * Only set up interrupts that we actually need: The Surface Book 3
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+ * does not have a DSM for base presence, so don't set up an interrupt
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+ * for that.
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+ */
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+ if (!acpi_check_dsm(handle, &shps_dsm_guid, SHPS_DSM_REVISION, BIT(dsm))) {
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+ dev_dbg(&pdev->dev, "IRQ notification via DSM not present (irq=%d)\n", type);
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+ return 0;
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+ }
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+
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+ gpiod = devm_gpiod_get(&pdev->dev, shps_gpio_names[type], GPIOD_ASIS);
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+ if (IS_ERR(gpiod))
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+ return PTR_ERR(gpiod);
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+
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+ irq = gpiod_to_irq(gpiod);
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+ if (irq < 0)
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+ return irq;
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+
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+ irq_name = devm_kasprintf(&pdev->dev, GFP_KERNEL, "shps-irq-%d", type);
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+ if (!irq_name)
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+ return -ENOMEM;
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+
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+ status = devm_request_threaded_irq(&pdev->dev, irq, NULL, shps_handle_irq,
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+ flags, irq_name, pdev);
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+ if (status)
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+ return status;
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+
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+ dev_dbg(&pdev->dev, "set up irq %d as type %d\n", irq, type);
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+
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+ sdev->gpio[type] = gpiod;
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+ sdev->irq[type] = irq;
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+
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+ return 0;
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+}
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+
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+static int surface_hotplug_remove(struct platform_device *pdev)
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+{
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+ struct shps_device *sdev = platform_get_drvdata(pdev);
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+ int i;
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+
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+ /* Ensure that IRQs have been fully handled and won't trigger any more. */
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+ for (i = 0; i < SHPS_NUM_IRQS; i++) {
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+ if (sdev->irq[i] != SHPS_IRQ_NOT_PRESENT)
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+ disable_irq(sdev->irq[i]);
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+
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+ mutex_destroy(&sdev->lock[i]);
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+ }
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+
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+ return 0;
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+}
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+
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+static int surface_hotplug_probe(struct platform_device *pdev)
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+{
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+ struct shps_device *sdev;
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+ int status, i;
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+
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+ /*
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+ * The MSHW0153 device is also present on the Surface Laptop 3,
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+ * however that doesn't have a hot-pluggable PCIe device. It also
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+ * doesn't have any GPIO interrupts/pins under the MSHW0153, so filter
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+ * it out here.
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+ */
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+ if (gpiod_count(&pdev->dev, NULL) < 0)
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+ return -ENODEV;
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+
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+ status = devm_acpi_dev_add_driver_gpios(&pdev->dev, shps_acpi_gpios);
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+ if (status)
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+ return status;
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+
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+ sdev = devm_kzalloc(&pdev->dev, sizeof(*sdev), GFP_KERNEL);
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+ if (!sdev)
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+ return -ENOMEM;
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+
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+ platform_set_drvdata(pdev, sdev);
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+
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+ /*
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+ * Initialize IRQs so that we can safely call surface_hotplug_remove()
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+ * on errors.
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+ */
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+ for (i = 0; i < SHPS_NUM_IRQS; i++)
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+ sdev->irq[i] = SHPS_IRQ_NOT_PRESENT;
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+
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+ /* Set up IRQs. */
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+ for (i = 0; i < SHPS_NUM_IRQS; i++) {
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+ mutex_init(&sdev->lock[i]);
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+
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+ status = shps_setup_irq(pdev, i);
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+ if (status) {
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+ dev_err(&pdev->dev, "failed to set up IRQ %d: %d\n", i, status);
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+ goto err;
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+ }
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+ }
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+
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+ /* Ensure everything is up-to-date. */
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+ for (i = 0; i < SHPS_NUM_IRQS; i++)
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+ if (sdev->irq[i] != SHPS_IRQ_NOT_PRESENT)
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+ shps_dsm_notify_irq(pdev, i);
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+
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+ return 0;
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+
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+err:
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+ surface_hotplug_remove(pdev);
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+ return status;
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+}
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+
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+static const struct acpi_device_id surface_hotplug_acpi_match[] = {
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+ { "MSHW0153", 0 },
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+ { },
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+};
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+MODULE_DEVICE_TABLE(acpi, surface_hotplug_acpi_match);
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+
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+static struct platform_driver surface_hotplug_driver = {
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+ .probe = surface_hotplug_probe,
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+ .remove = surface_hotplug_remove,
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+ .driver = {
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+ .name = "surface_hotplug",
|
|
+ .acpi_match_table = surface_hotplug_acpi_match,
|
|
+ .probe_type = PROBE_PREFER_ASYNCHRONOUS,
|
|
+ },
|
|
+};
|
|
+module_platform_driver(surface_hotplug_driver);
|
|
+
|
|
+MODULE_AUTHOR("Maximilian Luz <luzmaximilian@gmail.com>");
|
|
+MODULE_DESCRIPTION("Surface Hot-Plug Signaling Driver for Surface Book Devices");
|
|
+MODULE_LICENSE("GPL");
|
|
--
|
|
2.33.0
|
|
|
|
From 4a19147e3089c339a35adf8babad555cda52cb2e Mon Sep 17 00:00:00 2001
|
|
From: Maximilian Luz <luzmaximilian@gmail.com>
|
|
Date: Fri, 2 Jul 2021 14:35:43 +0200
|
|
Subject: [PATCH] Revert "Revert "PCI: PM: Do not read power state in
|
|
pci_enable_device_flags()""
|
|
|
|
This reverts commit f11f9ff8a7c97b2a3990c7322304627d9b58d362.
|
|
|
|
Patchset: surface-hotplug
|
|
---
|
|
drivers/pci/pci.c | 16 +++-------------
|
|
1 file changed, 3 insertions(+), 13 deletions(-)
|
|
|
|
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
|
|
index 29f5d699fa06..c73fcdff0c16 100644
|
|
--- a/drivers/pci/pci.c
|
|
+++ b/drivers/pci/pci.c
|
|
@@ -1874,20 +1874,10 @@ static int pci_enable_device_flags(struct pci_dev *dev, unsigned long flags)
|
|
int err;
|
|
int i, bars = 0;
|
|
|
|
- /*
|
|
- * Power state could be unknown at this point, either due to a fresh
|
|
- * boot or a device removal call. So get the current power state
|
|
- * so that things like MSI message writing will behave as expected
|
|
- * (e.g. if the device really is in D0 at enable time).
|
|
- */
|
|
- if (dev->pm_cap) {
|
|
- u16 pmcsr;
|
|
- pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr);
|
|
- dev->current_state = (pmcsr & PCI_PM_CTRL_STATE_MASK);
|
|
- }
|
|
-
|
|
- if (atomic_inc_return(&dev->enable_cnt) > 1)
|
|
+ if (atomic_inc_return(&dev->enable_cnt) > 1) {
|
|
+ pci_update_current_state(dev, dev->current_state);
|
|
return 0; /* already enabled */
|
|
+ }
|
|
|
|
bridge = pci_upstream_bridge(dev);
|
|
if (bridge)
|
|
--
|
|
2.33.0
|
|
|