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* [PATCH v4 0/6] Device tree support for Hyper-V VMBus driver
@ 2023-02-07  7:49 Saurabh Sengar
  2023-02-07  7:49 ` [PATCH v4 1/6] drivers/clocksource/hyper-v: non ACPI support in hyperv clock Saurabh Sengar
                   ` (5 more replies)
  0 siblings, 6 replies; 19+ messages in thread
From: Saurabh Sengar @ 2023-02-07  7:49 UTC (permalink / raw)
  To: robh+dt, krzysztof.kozlowski+dt, kys, haiyangz, wei.liu, decui,
	daniel.lezcano, tglx, virtualization, devicetree, linux-kernel,
	linux-hyperv, mikelley, ssengar, dphadke

This set of patches expands the VMBus driver to include device tree
support. This feature allows for a kernel boot without the use of ACPI
tables, resulting in a smaller memory footprint and potentially faster
boot times. This is tested by enabling CONFIG_FLAT and OF_EARLY_FLATTREE
for x86.

The first two patches enable compilation of Hyper-V APIs in a non-ACPI
build.

The third patch converts the VMBus driver from acpi to more generic
platform driver.

Further to add device tree documentation for VMBus, it needs to club with
other virtualization driver's documentation. For this rename the virtio
folder to more generic hypervisor, so that all the hypervisor based
devices can co-exist in a single place in device tree documentation. The
fourth patch does this renaming.

The fifth patch introduces the device tree documentation for VMBus.

The sixth patch adds device tree support to the VMBus driver. Currently
this is tested only for x86 and it may not work for other archs.

[V4]
- rebased which fixed return type of 'vmbus_mmio_remove' from int to void
- used __maybe_unused for 'vmbus_of_match' and safeguard vmbus_acpi_device_ids
  under #ifdef

[V3]
- Changed the logic to use generic api (for_each_of_range) for parsing "ranges".
- Remove dependency of ACPI for HYPERV in case of x86.
- Removed "device tree bindings" from title and patch subject.
- Removed duplicate vendor prefix, used microsoft instead of msft.
- Use 'soc' in example of device tree documantation for parent node.
- Fixed compatible schemas error generated in other modules referring to
  virtio.
- Drop hex notation and leading zeros from device tree cell properties.
- Added missing full stop at the end of commit message.
- Typos fix: s/Initaly/Initially/ and s/hibernate/hibernation/.
- Replace to_acpi_device with ACPI_COMPANION which simplify the logic.
- Added more info in cover letter aboutsystem under test.

[v2]
- Convert VMBus acpi device to platform device, and added device tree support
  in separate patch. This enables using same driver structure for both the flows.
- In Device tree documentation, changed virtio folder to hypervisor and moved
  VMBus documentation there.
- Moved bindings before Device tree patch.
- Removed stale ".data" and ".name" field from of_device match table.
- Removed debug print.

Saurabh Sengar (6):
  drivers/clocksource/hyper-v: non ACPI support in hyperv clock
  Drivers: hv: allow non ACPI compilation for
    hv_is_hibernation_supported
  Drivers: hv: vmbus: Convert acpi_device to more generic
    platform_device
  dt-bindings: hypervisor: Rename virtio to hypervisor
  dt-bindings: hypervisor: VMBus
  Driver: VMBus: Add device tree support

 .../devicetree/bindings/gpio/gpio-virtio.yaml      |   4 +-
 .../bindings/hypervisor/microsoft,vmbus.yaml       |  48 +++++++++
 .../bindings/{virtio => hypervisor}/mmio.yaml      |   2 +-
 .../bindings/{virtio => hypervisor}/pci-iommu.yaml |   2 +-
 .../{virtio => hypervisor}/virtio-device.yaml      |   2 +-
 .../devicetree/bindings/i2c/i2c-virtio.yaml        |   4 +-
 MAINTAINERS                                        |   3 +-
 drivers/clocksource/hyperv_timer.c                 |  15 ++-
 drivers/hv/Kconfig                                 |   4 +-
 drivers/hv/hv_common.c                             |   4 +
 drivers/hv/vmbus_drv.c                             | 120 ++++++++++++++++-----
 11 files changed, 171 insertions(+), 37 deletions(-)
 create mode 100644 Documentation/devicetree/bindings/hypervisor/microsoft,vmbus.yaml
 rename Documentation/devicetree/bindings/{virtio => hypervisor}/mmio.yaml (95%)
 rename Documentation/devicetree/bindings/{virtio => hypervisor}/pci-iommu.yaml (98%)
 rename Documentation/devicetree/bindings/{virtio => hypervisor}/virtio-device.yaml (93%)

-- 
1.8.3.1


^ permalink raw reply	[flat|nested] 19+ messages in thread
* [PATCH v4 1/6] drivers/clocksource/hyper-v: non ACPI support in hyperv clock
  2023-02-07  7:49 [PATCH v4 0/6] Device tree support for Hyper-V VMBus driver Saurabh Sengar
@ 2023-02-07  7:49 ` Saurabh Sengar
  2023-02-08  1:22   ` Michael Kelley (LINUX)
  2023-02-07  7:49 ` [PATCH v4 2/6] Drivers: hv: allow non ACPI compilation for hv_is_hibernation_supported Saurabh Sengar
                   ` (4 subsequent siblings)
  5 siblings, 1 reply; 19+ messages in thread
From: Saurabh Sengar @ 2023-02-07  7:49 UTC (permalink / raw)
  To: robh+dt, krzysztof.kozlowski+dt, kys, haiyangz, wei.liu, decui,
	daniel.lezcano, tglx, virtualization, devicetree, linux-kernel,
	linux-hyperv, mikelley, ssengar, dphadke

Add a placeholder function for the hv_setup_stimer0_irq API to accommodate
systems without ACPI support. Since this function is not utilized on
x86/x64 systems and non-ACPI support is only intended for x86/x64 systems,
a placeholder function is sufficient for now and can be improved upon if
necessary in the future.

This change will make it easier to add device tree support for VMBus in
subsequent commits.

Signed-off-by: Saurabh Sengar <ssengar@linux.microsoft.com>
---
 drivers/clocksource/hyperv_timer.c | 15 +++++++++++++--
 1 file changed, 13 insertions(+), 2 deletions(-)

diff --git a/drivers/clocksource/hyperv_timer.c b/drivers/clocksource/hyperv_timer.c
index c0cef92..f32948c 100644
--- a/drivers/clocksource/hyperv_timer.c
+++ b/drivers/clocksource/hyperv_timer.c
@@ -49,7 +49,7 @@
 
 static int stimer0_irq = -1;
 static int stimer0_message_sint;
-static DEFINE_PER_CPU(long, stimer0_evt);
+static __maybe_unused DEFINE_PER_CPU(long, stimer0_evt);
 
 /*
  * Common code for stimer0 interrupts coming via Direct Mode or
@@ -68,7 +68,7 @@ void hv_stimer0_isr(void)
  * stimer0 interrupt handler for architectures that support
  * per-cpu interrupts, which also implies Direct Mode.
  */
-static irqreturn_t hv_stimer0_percpu_isr(int irq, void *dev_id)
+static irqreturn_t __maybe_unused hv_stimer0_percpu_isr(int irq, void *dev_id)
 {
 	hv_stimer0_isr();
 	return IRQ_HANDLED;
@@ -196,6 +196,7 @@ void __weak hv_remove_stimer0_handler(void)
 {
 };
 
+#ifdef CONFIG_ACPI
 /* Called only on architectures with per-cpu IRQs (i.e., not x86/x64) */
 static int hv_setup_stimer0_irq(void)
 {
@@ -230,6 +231,16 @@ static void hv_remove_stimer0_irq(void)
 		stimer0_irq = -1;
 	}
 }
+#else
+static int hv_setup_stimer0_irq(void)
+{
+	return 0;
+}
+
+static void hv_remove_stimer0_irq(void)
+{
+}
+#endif
 
 /* hv_stimer_alloc - Global initialization of the clockevent and stimer0 */
 int hv_stimer_alloc(bool have_percpu_irqs)
-- 
1.8.3.1


^ permalink raw reply related	[flat|nested] 19+ messages in thread
* [PATCH v4 2/6] Drivers: hv: allow non ACPI compilation for hv_is_hibernation_supported
  2023-02-07  7:49 [PATCH v4 0/6] Device tree support for Hyper-V VMBus driver Saurabh Sengar
  2023-02-07  7:49 ` [PATCH v4 1/6] drivers/clocksource/hyper-v: non ACPI support in hyperv clock Saurabh Sengar
@ 2023-02-07  7:49 ` Saurabh Sengar
  2023-02-08  1:35   ` Michael Kelley (LINUX)
  2023-02-07  7:49 ` [PATCH v4 3/6] Drivers: hv: vmbus: Convert acpi_device to more generic platform_device Saurabh Sengar
                   ` (3 subsequent siblings)
  5 siblings, 1 reply; 19+ messages in thread
From: Saurabh Sengar @ 2023-02-07  7:49 UTC (permalink / raw)
  To: robh+dt, krzysztof.kozlowski+dt, kys, haiyangz, wei.liu, decui,
	daniel.lezcano, tglx, virtualization, devicetree, linux-kernel,
	linux-hyperv, mikelley, ssengar, dphadke

acpi_sleep_state_supported API is only define for CONFIG_ACPI flag and
thus it can't be used for non-ACPI builds. Initially there won't be
hibernation support for non ACPI builds.

This change will help adding device tree support in subsequent commits.

Signed-off-by: Saurabh Sengar <ssengar@linux.microsoft.com>
---
 drivers/hv/hv_common.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/hv/hv_common.c b/drivers/hv/hv_common.c
index 52a6f89..370ec20 100644
--- a/drivers/hv/hv_common.c
+++ b/drivers/hv/hv_common.c
@@ -234,7 +234,11 @@ void hv_setup_dma_ops(struct device *dev, bool coherent)
 
 bool hv_is_hibernation_supported(void)
 {
+#ifdef CONFIG_ACPI
 	return !hv_root_partition && acpi_sleep_state_supported(ACPI_STATE_S4);
+#else
+	return false;
+#endif
 }
 EXPORT_SYMBOL_GPL(hv_is_hibernation_supported);
 
-- 
1.8.3.1


^ permalink raw reply related	[flat|nested] 19+ messages in thread
* [PATCH v4 3/6] Drivers: hv: vmbus: Convert acpi_device to more generic platform_device
  2023-02-07  7:49 [PATCH v4 0/6] Device tree support for Hyper-V VMBus driver Saurabh Sengar
  2023-02-07  7:49 ` [PATCH v4 1/6] drivers/clocksource/hyper-v: non ACPI support in hyperv clock Saurabh Sengar
  2023-02-07  7:49 ` [PATCH v4 2/6] Drivers: hv: allow non ACPI compilation for hv_is_hibernation_supported Saurabh Sengar
@ 2023-02-07  7:49 ` Saurabh Sengar
  2023-02-08  1:50   ` Michael Kelley (LINUX)
  2023-02-07  7:49 ` [PATCH v4 4/6] dt-bindings: hypervisor: Rename virtio to hypervisor Saurabh Sengar
                   ` (2 subsequent siblings)
  5 siblings, 1 reply; 19+ messages in thread
From: Saurabh Sengar @ 2023-02-07  7:49 UTC (permalink / raw)
  To: robh+dt, krzysztof.kozlowski+dt, kys, haiyangz, wei.liu, decui,
	daniel.lezcano, tglx, virtualization, devicetree, linux-kernel,
	linux-hyperv, mikelley, ssengar, dphadke

Use more generic platform device instead of acpi device. Also rename the
function vmbus_acpi_remove to more generic name vmbus_mmio_remove.

Signed-off-by: Saurabh Sengar <ssengar@linux.microsoft.com>
---
[V4]
- rebased which fixed return type of 'vmbus_mmio_remove' from int to void

 drivers/hv/vmbus_drv.c | 58 ++++++++++++++++++++++++++++++--------------------
 1 file changed, 35 insertions(+), 23 deletions(-)

diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
index d24dd65..7349715 100644
--- a/drivers/hv/vmbus_drv.c
+++ b/drivers/hv/vmbus_drv.c
@@ -12,6 +12,7 @@
 #include <linux/init.h>
 #include <linux/module.h>
 #include <linux/device.h>
+#include <linux/platform_device.h>
 #include <linux/interrupt.h>
 #include <linux/sysctl.h>
 #include <linux/slab.h>
@@ -44,7 +45,7 @@ struct vmbus_dynid {
 	struct hv_vmbus_device_id id;
 };
 
-static struct acpi_device  *hv_acpi_dev;
+static struct device  *hv_dev;
 
 static int hyperv_cpuhp_online;
 
@@ -143,7 +144,7 @@ static int hv_die_panic_notify_crash(struct notifier_block *self,
 
 static int vmbus_exists(void)
 {
-	if (hv_acpi_dev == NULL)
+	if (hv_dev == NULL)
 		return -ENODEV;
 
 	return 0;
@@ -932,7 +933,7 @@ static int vmbus_dma_configure(struct device *child_device)
 	 * On x86/x64 coherence is assumed and these calls have no effect.
 	 */
 	hv_setup_dma_ops(child_device,
-		device_get_dma_attr(&hv_acpi_dev->dev) == DEV_DMA_COHERENT);
+		device_get_dma_attr(hv_dev) == DEV_DMA_COHERENT);
 	return 0;
 }
 
@@ -2090,7 +2091,7 @@ int vmbus_device_register(struct hv_device *child_device_obj)
 		     &child_device_obj->channel->offermsg.offer.if_instance);
 
 	child_device_obj->device.bus = &hv_bus;
-	child_device_obj->device.parent = &hv_acpi_dev->dev;
+	child_device_obj->device.parent = hv_dev;
 	child_device_obj->device.release = vmbus_device_release;
 
 	child_device_obj->device.dma_parms = &child_device_obj->dma_parms;
@@ -2262,7 +2263,7 @@ static acpi_status vmbus_walk_resources(struct acpi_resource *res, void *ctx)
 	return AE_OK;
 }
 
-static void vmbus_acpi_remove(struct acpi_device *device)
+static void vmbus_mmio_remove(void)
 {
 	struct resource *cur_res;
 	struct resource *next_res;
@@ -2441,13 +2442,14 @@ void vmbus_free_mmio(resource_size_t start, resource_size_t size)
 }
 EXPORT_SYMBOL_GPL(vmbus_free_mmio);
 
-static int vmbus_acpi_add(struct acpi_device *device)
+static int vmbus_acpi_add(struct platform_device *pdev)
 {
 	acpi_status result;
 	int ret_val = -ENODEV;
 	struct acpi_device *ancestor;
+	struct acpi_device *device = ACPI_COMPANION(&pdev->dev);
 
-	hv_acpi_dev = device;
+	hv_dev = &device->dev;
 
 	/*
 	 * Older versions of Hyper-V for ARM64 fail to include the _CCA
@@ -2489,10 +2491,21 @@ static int vmbus_acpi_add(struct acpi_device *device)
 
 acpi_walk_err:
 	if (ret_val)
-		vmbus_acpi_remove(device);
+		vmbus_mmio_remove();
 	return ret_val;
 }
 
+static int vmbus_platform_driver_probe(struct platform_device *pdev)
+{
+	return vmbus_acpi_add(pdev);
+}
+
+static int vmbus_platform_driver_remove(struct platform_device *pdev)
+{
+	vmbus_mmio_remove();
+	return 0;
+}
+
 #ifdef CONFIG_PM_SLEEP
 static int vmbus_bus_suspend(struct device *dev)
 {
@@ -2658,15 +2671,15 @@ static int vmbus_bus_resume(struct device *dev)
 	.restore_noirq	= vmbus_bus_resume
 };
 
-static struct acpi_driver vmbus_acpi_driver = {
-	.name = "vmbus",
-	.ids = vmbus_acpi_device_ids,
-	.ops = {
-		.add = vmbus_acpi_add,
-		.remove = vmbus_acpi_remove,
-	},
-	.drv.pm = &vmbus_bus_pm,
-	.drv.probe_type = PROBE_FORCE_SYNCHRONOUS,
+static struct platform_driver vmbus_platform_driver = {
+	.probe = vmbus_platform_driver_probe,
+	.remove = vmbus_platform_driver_remove,
+	.driver = {
+		.name = "vmbus",
+		.acpi_match_table = ACPI_PTR(vmbus_acpi_device_ids),
+		.pm = &vmbus_bus_pm,
+		.probe_type = PROBE_FORCE_SYNCHRONOUS,
+	}
 };
 
 static void hv_kexec_handler(void)
@@ -2750,12 +2763,11 @@ static int __init hv_acpi_init(void)
 	/*
 	 * Get ACPI resources first.
 	 */
-	ret = acpi_bus_register_driver(&vmbus_acpi_driver);
-
+	ret = platform_driver_register(&vmbus_platform_driver);
 	if (ret)
 		return ret;
 
-	if (!hv_acpi_dev) {
+	if (!hv_dev) {
 		ret = -ENODEV;
 		goto cleanup;
 	}
@@ -2785,8 +2797,8 @@ static int __init hv_acpi_init(void)
 	return 0;
 
 cleanup:
-	acpi_bus_unregister_driver(&vmbus_acpi_driver);
-	hv_acpi_dev = NULL;
+	platform_driver_unregister(&vmbus_platform_driver);
+	hv_dev = NULL;
 	return ret;
 }
 
@@ -2839,7 +2851,7 @@ static void __exit vmbus_exit(void)
 
 	cpuhp_remove_state(hyperv_cpuhp_online);
 	hv_synic_free();
-	acpi_bus_unregister_driver(&vmbus_acpi_driver);
+	platform_driver_unregister(&vmbus_platform_driver);
 }
 
 
-- 
1.8.3.1


^ permalink raw reply related	[flat|nested] 19+ messages in thread
* [PATCH v4 4/6] dt-bindings: hypervisor: Rename virtio to hypervisor
  2023-02-07  7:49 [PATCH v4 0/6] Device tree support for Hyper-V VMBus driver Saurabh Sengar
                   ` (2 preceding siblings ...)
  2023-02-07  7:49 ` [PATCH v4 3/6] Drivers: hv: vmbus: Convert acpi_device to more generic platform_device Saurabh Sengar
@ 2023-02-07  7:49 ` Saurabh Sengar
  2023-02-07 18:39   ` Rob Herring
  2023-02-07  7:49 ` [PATCH v4 5/6] dt-bindings: hypervisor: VMBus Saurabh Sengar
  2023-02-07  7:49 ` [PATCH v4 6/6] Driver: VMBus: Add device tree support Saurabh Sengar
  5 siblings, 1 reply; 19+ messages in thread
From: Saurabh Sengar @ 2023-02-07  7:49 UTC (permalink / raw)
  To: robh+dt, krzysztof.kozlowski+dt, kys, haiyangz, wei.liu, decui,
	daniel.lezcano, tglx, virtualization, devicetree, linux-kernel,
	linux-hyperv, mikelley, ssengar, dphadke

Rename virtio folder to more generic hypervisor, so that this can
accommodate more devices of similar type.

Signed-off-by: Saurabh Sengar <ssengar@linux.microsoft.com>
---
 Documentation/devicetree/bindings/gpio/gpio-virtio.yaml               | 4 ++--
 Documentation/devicetree/bindings/{virtio => hypervisor}/mmio.yaml    | 2 +-
 .../devicetree/bindings/{virtio => hypervisor}/pci-iommu.yaml         | 2 +-
 .../devicetree/bindings/{virtio => hypervisor}/virtio-device.yaml     | 2 +-
 Documentation/devicetree/bindings/i2c/i2c-virtio.yaml                 | 4 ++--
 MAINTAINERS                                                           | 2 +-
 6 files changed, 8 insertions(+), 8 deletions(-)
 rename Documentation/devicetree/bindings/{virtio => hypervisor}/mmio.yaml (95%)
 rename Documentation/devicetree/bindings/{virtio => hypervisor}/pci-iommu.yaml (98%)
 rename Documentation/devicetree/bindings/{virtio => hypervisor}/virtio-device.yaml (93%)

diff --git a/Documentation/devicetree/bindings/gpio/gpio-virtio.yaml b/Documentation/devicetree/bindings/gpio/gpio-virtio.yaml
index 601d857..e08ed2a 100644
--- a/Documentation/devicetree/bindings/gpio/gpio-virtio.yaml
+++ b/Documentation/devicetree/bindings/gpio/gpio-virtio.yaml
@@ -10,10 +10,10 @@ maintainers:
   - Viresh Kumar <viresh.kumar@linaro.org>
 
 allOf:
-  - $ref: /schemas/virtio/virtio-device.yaml#
+  - $ref: /schemas/hypervisor/virtio-device.yaml#
 
 description:
-  Virtio GPIO controller, see /schemas/virtio/virtio-device.yaml for more
+  Virtio GPIO controller, see /schemas/hypervisor/virtio-device.yaml for more
   details.
 
 properties:
diff --git a/Documentation/devicetree/bindings/virtio/mmio.yaml b/Documentation/devicetree/bindings/hypervisor/mmio.yaml
similarity index 95%
rename from Documentation/devicetree/bindings/virtio/mmio.yaml
rename to Documentation/devicetree/bindings/hypervisor/mmio.yaml
index 0aa8433..8492c9b 100644
--- a/Documentation/devicetree/bindings/virtio/mmio.yaml
+++ b/Documentation/devicetree/bindings/hypervisor/mmio.yaml
@@ -1,7 +1,7 @@
 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
 %YAML 1.2
 ---
-$id: http://devicetree.org/schemas/virtio/mmio.yaml#
+$id: http://devicetree.org/schemas/hypervisor/mmio.yaml#
 $schema: http://devicetree.org/meta-schemas/core.yaml#
 
 title: virtio memory mapped devices
diff --git a/Documentation/devicetree/bindings/virtio/pci-iommu.yaml b/Documentation/devicetree/bindings/hypervisor/pci-iommu.yaml
similarity index 98%
rename from Documentation/devicetree/bindings/virtio/pci-iommu.yaml
rename to Documentation/devicetree/bindings/hypervisor/pci-iommu.yaml
index 972a785..52de535 100644
--- a/Documentation/devicetree/bindings/virtio/pci-iommu.yaml
+++ b/Documentation/devicetree/bindings/hypervisor/pci-iommu.yaml
@@ -1,7 +1,7 @@
 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
 %YAML 1.2
 ---
-$id: http://devicetree.org/schemas/virtio/pci-iommu.yaml#
+$id: http://devicetree.org/schemas/hypervisor/pci-iommu.yaml#
 $schema: http://devicetree.org/meta-schemas/core.yaml#
 
 title: virtio-iommu device using the virtio-pci transport
diff --git a/Documentation/devicetree/bindings/virtio/virtio-device.yaml b/Documentation/devicetree/bindings/hypervisor/virtio-device.yaml
similarity index 93%
rename from Documentation/devicetree/bindings/virtio/virtio-device.yaml
rename to Documentation/devicetree/bindings/hypervisor/virtio-device.yaml
index 8c6919b..7b8d93b 100644
--- a/Documentation/devicetree/bindings/virtio/virtio-device.yaml
+++ b/Documentation/devicetree/bindings/hypervisor/virtio-device.yaml
@@ -1,7 +1,7 @@
 # SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
 %YAML 1.2
 ---
-$id: http://devicetree.org/schemas/virtio/virtio-device.yaml#
+$id: http://devicetree.org/schemas/hypervisor/virtio-device.yaml#
 $schema: http://devicetree.org/meta-schemas/core.yaml#
 
 title: Virtio device
diff --git a/Documentation/devicetree/bindings/i2c/i2c-virtio.yaml b/Documentation/devicetree/bindings/i2c/i2c-virtio.yaml
index 7d87ed8..99a0ce2 100644
--- a/Documentation/devicetree/bindings/i2c/i2c-virtio.yaml
+++ b/Documentation/devicetree/bindings/i2c/i2c-virtio.yaml
@@ -11,10 +11,10 @@ maintainers:
 
 allOf:
   - $ref: /schemas/i2c/i2c-controller.yaml#
-  - $ref: /schemas/virtio/virtio-device.yaml#
+  - $ref: /schemas/hypervisor/virtio-device.yaml#
 
 description:
-  Virtio I2C device, see /schemas/virtio/virtio-device.yaml for more details.
+  Virtio I2C device, see /schemas/hypervisor/virtio-device.yaml for more details.
 
 properties:
   $nodename:
diff --git a/MAINTAINERS b/MAINTAINERS
index f76ca28..27a5650 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -21977,7 +21977,7 @@ L:	virtualization@lists.linux-foundation.org
 S:	Maintained
 F:	Documentation/ABI/testing/sysfs-bus-vdpa
 F:	Documentation/ABI/testing/sysfs-class-vduse
-F:	Documentation/devicetree/bindings/virtio/
+F:	Documentation/devicetree/bindings/hypervisor/
 F:	Documentation/driver-api/virtio/
 F:	drivers/block/virtio_blk.c
 F:	drivers/crypto/virtio/
-- 
1.8.3.1


^ permalink raw reply related	[flat|nested] 19+ messages in thread
* [PATCH v4 5/6] dt-bindings: hypervisor: VMBus
  2023-02-07  7:49 [PATCH v4 0/6] Device tree support for Hyper-V VMBus driver Saurabh Sengar
                   ` (3 preceding siblings ...)
  2023-02-07  7:49 ` [PATCH v4 4/6] dt-bindings: hypervisor: Rename virtio to hypervisor Saurabh Sengar
@ 2023-02-07  7:49 ` Saurabh Sengar
  2023-02-07 13:00   ` Rob Herring
  2023-02-07  7:49 ` [PATCH v4 6/6] Driver: VMBus: Add device tree support Saurabh Sengar
  5 siblings, 1 reply; 19+ messages in thread
From: Saurabh Sengar @ 2023-02-07  7:49 UTC (permalink / raw)
  To: robh+dt, krzysztof.kozlowski+dt, kys, haiyangz, wei.liu, decui,
	daniel.lezcano, tglx, virtualization, devicetree, linux-kernel,
	linux-hyperv, mikelley, ssengar, dphadke

Add dt-bindings for Hyper-V VMBus.

Signed-off-by: Saurabh Sengar <ssengar@linux.microsoft.com>
---
 .../bindings/hypervisor/microsoft,vmbus.yaml       | 48 ++++++++++++++++++++++
 MAINTAINERS                                        |  1 +
 2 files changed, 49 insertions(+)
 create mode 100644 Documentation/devicetree/bindings/hypervisor/microsoft,vmbus.yaml

diff --git a/Documentation/devicetree/bindings/hypervisor/microsoft,vmbus.yaml b/Documentation/devicetree/bindings/hypervisor/microsoft,vmbus.yaml
new file mode 100644
index 0000000..a9c43a6
--- /dev/null
+++ b/Documentation/devicetree/bindings/hypervisor/microsoft,vmbus.yaml
@@ -0,0 +1,48 @@
+# SPDX-License-Identifier: (GPL-2.0-only OR BSD-2-Clause)
+%YAML 1.2
+---
+$id: http://devicetree.org/schemas/hypervisor/microsoft,vmbus.yaml#
+$schema: http://devicetree.org/meta-schemas/core.yaml#
+
+title: Microsoft Hyper-V VMBus
+
+maintainers:
+  - Saurabh Sengar <ssengar@linux.microsoft.com>
+
+description:
+  VMBus is a software bus that implement the protocols for communication
+  between the root or host OS and guest OSs (virtual machines).
+
+properties:
+  compatible:
+    const: microsoft,vmbus
+
+  ranges: true
+
+  '#address-cells':
+    const: 2
+
+  '#size-cells':
+    const: 1
+
+required:
+  - compatible
+  - ranges
+  - '#address-cells'
+  - '#size-cells'
+
+additionalProperties: false
+
+examples:
+  - |
+    soc {
+        #address-cells = <2>;
+        #size-cells = <2>;
+
+        vmbus@ff0000000 {
+            #address-cells = <2>;
+            #size-cells = <1>;
+            compatible = "microsoft,vmbus";
+            ranges = <0x0f 0xf0000000 0x0f 0xf0000000 0x10000000>;
+        };
+    };
diff --git a/MAINTAINERS b/MAINTAINERS
index 27a5650..669f1c1 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -9490,6 +9490,7 @@ S:	Supported
 T:	git git://git.kernel.org/pub/scm/linux/kernel/git/hyperv/linux.git
 F:	Documentation/ABI/stable/sysfs-bus-vmbus
 F:	Documentation/ABI/testing/debugfs-hyperv
+F:	Documentation/devicetree/bindings/hypervisor/microsoft,vmbus.yaml
 F:	Documentation/virt/hyperv
 F:	Documentation/networking/device_drivers/ethernet/microsoft/netvsc.rst
 F:	arch/arm64/hyperv
-- 
1.8.3.1


^ permalink raw reply related	[flat|nested] 19+ messages in thread
* [PATCH v4 6/6] Driver: VMBus: Add device tree support
  2023-02-07  7:49 [PATCH v4 0/6] Device tree support for Hyper-V VMBus driver Saurabh Sengar
                   ` (4 preceding siblings ...)
  2023-02-07  7:49 ` [PATCH v4 5/6] dt-bindings: hypervisor: VMBus Saurabh Sengar
@ 2023-02-07  7:49 ` Saurabh Sengar
  2023-02-08  8:22   ` kernel test robot
  5 siblings, 1 reply; 19+ messages in thread
From: Saurabh Sengar @ 2023-02-07  7:49 UTC (permalink / raw)
  To: robh+dt, krzysztof.kozlowski+dt, kys, haiyangz, wei.liu, decui,
	daniel.lezcano, tglx, virtualization, devicetree, linux-kernel,
	linux-hyperv, mikelley, ssengar, dphadke

Update the driver to support device tree boot as well along with ACPI.
At present the device tree parsing only provides the mmio region info
and is not the exact copy of ACPI parsing. This is sufficient to cater
all the current device tree usecases for VMBus.

Currently device tree is supported only for x86 systems.

Signed-off-by: Saurabh Sengar <ssengar@linux.microsoft.com>
---
[V4]
- used __maybe_unused for 'vmbus_of_match' and safeguard vmbus_acpi_device_ids
  under #ifdef

 drivers/hv/Kconfig     |  4 ++--
 drivers/hv/vmbus_drv.c | 62 ++++++++++++++++++++++++++++++++++++++++++++++++--
 2 files changed, 62 insertions(+), 4 deletions(-)

diff --git a/drivers/hv/Kconfig b/drivers/hv/Kconfig
index 0747a8f..7e44d42 100644
--- a/drivers/hv/Kconfig
+++ b/drivers/hv/Kconfig
@@ -4,8 +4,8 @@ menu "Microsoft Hyper-V guest support"
 
 config HYPERV
 	tristate "Microsoft Hyper-V client drivers"
-	depends on ACPI && ((X86 && X86_LOCAL_APIC && HYPERVISOR_GUEST) \
-		|| (ARM64 && !CPU_BIG_ENDIAN))
+	depends on (X86 && X86_LOCAL_APIC && HYPERVISOR_GUEST) \
+		|| (ACPI && ARM64 && !CPU_BIG_ENDIAN)
 	select PARAVIRT
 	select X86_HV_CALLBACK_VECTOR if X86
 	select VMAP_PFN
diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
index 7349715..1774cae 100644
--- a/drivers/hv/vmbus_drv.c
+++ b/drivers/hv/vmbus_drv.c
@@ -20,6 +20,7 @@
 #include <linux/completion.h>
 #include <linux/hyperv.h>
 #include <linux/kernel_stat.h>
+#include <linux/of_address.h>
 #include <linux/clockchips.h>
 #include <linux/cpu.h>
 #include <linux/sched/isolation.h>
@@ -2152,7 +2153,7 @@ void vmbus_device_unregister(struct hv_device *device_obj)
 	device_unregister(&device_obj->device);
 }
 
-
+#ifdef CONFIG_ACPI
 /*
  * VMBUS is an acpi enumerated device. Get the information we
  * need from DSDT.
@@ -2262,6 +2263,7 @@ static acpi_status vmbus_walk_resources(struct acpi_resource *res, void *ctx)
 
 	return AE_OK;
 }
+#endif
 
 static void vmbus_mmio_remove(void)
 {
@@ -2282,7 +2284,7 @@ static void vmbus_mmio_remove(void)
 	}
 }
 
-static void vmbus_reserve_fb(void)
+static void __maybe_unused vmbus_reserve_fb(void)
 {
 	resource_size_t start = 0, size;
 	struct pci_dev *pdev;
@@ -2442,6 +2444,7 @@ void vmbus_free_mmio(resource_size_t start, resource_size_t size)
 }
 EXPORT_SYMBOL_GPL(vmbus_free_mmio);
 
+#ifdef CONFIG_ACPI
 static int vmbus_acpi_add(struct platform_device *pdev)
 {
 	acpi_status result;
@@ -2494,10 +2497,52 @@ static int vmbus_acpi_add(struct platform_device *pdev)
 		vmbus_mmio_remove();
 	return ret_val;
 }
+#else
+
+static int vmbus_device_add(struct platform_device *pdev)
+{
+	struct resource **cur_res = &hyperv_mmio;
+	struct of_range range;
+	struct of_range_parser parser;
+	struct device_node *np;
+	int ret = 0;
+
+	hv_dev = &pdev->dev;
+	np = pdev->dev.of_node;
+
+	ret = of_range_parser_init(&parser, np);
+	if (ret) {
+		dev_err(hv_dev, "Failed to parse resources.\n");
+		return ret;
+	}
+
+	for_each_of_range(&parser, &range) {
+		struct resource *res;
+
+		res = kzalloc(sizeof(*res), GFP_ATOMIC);
+		if (!res)
+			return -ENOMEM;
+
+		res->name = "hyperv mmio";
+		res->flags = IORESOURCE_MEM | IORESOURCE_MEM_64;
+		res->start = range.pci_addr;
+		res->end = range.pci_addr + range.size;
+
+		*cur_res = res;
+		cur_res = &res->sibling;
+	}
+
+	return ret;
+}
+#endif
 
 static int vmbus_platform_driver_probe(struct platform_device *pdev)
 {
+#ifdef CONFIG_ACPI
 	return vmbus_acpi_add(pdev);
+#else
+	return vmbus_device_add(pdev);
+#endif
 }
 
 static int vmbus_platform_driver_remove(struct platform_device *pdev)
@@ -2643,12 +2688,24 @@ static int vmbus_bus_resume(struct device *dev)
 #define vmbus_bus_resume NULL
 #endif /* CONFIG_PM_SLEEP */
 
+static const struct __maybe_unused of_device_id vmbus_of_match[] = {
+	{
+		.compatible = "microsoft,vmbus",
+	},
+	{
+		/* sentinel */
+	},
+};
+MODULE_DEVICE_TABLE(of, vmbus_of_match);
+
+#ifdef CONFIG_ACPI
 static const struct acpi_device_id vmbus_acpi_device_ids[] = {
 	{"VMBUS", 0},
 	{"VMBus", 0},
 	{"", 0},
 };
 MODULE_DEVICE_TABLE(acpi, vmbus_acpi_device_ids);
+#endif
 
 /*
  * Note: we must use the "no_irq" ops, otherwise hibernation can not work with
@@ -2677,6 +2734,7 @@ static int vmbus_bus_resume(struct device *dev)
 	.driver = {
 		.name = "vmbus",
 		.acpi_match_table = ACPI_PTR(vmbus_acpi_device_ids),
+		.of_match_table = of_match_ptr(vmbus_of_match),
 		.pm = &vmbus_bus_pm,
 		.probe_type = PROBE_FORCE_SYNCHRONOUS,
 	}
-- 
1.8.3.1


^ permalink raw reply related	[flat|nested] 19+ messages in thread
* Re: [PATCH v4 5/6] dt-bindings: hypervisor: VMBus
  2023-02-07  7:49 ` [PATCH v4 5/6] dt-bindings: hypervisor: VMBus Saurabh Sengar
@ 2023-02-07 13:00   ` Rob Herring
  2023-02-07 18:34     ` Rob Herring
  0 siblings, 1 reply; 19+ messages in thread
From: Rob Herring @ 2023-02-07 13:00 UTC (permalink / raw)
  To: Saurabh Sengar
  Cc: mikelley, wei.liu, daniel.lezcano, devicetree, ssengar,
	virtualization, decui, haiyangz, linux-hyperv, robh+dt, dphadke,
	kys, linux-kernel, tglx, krzysztof.kozlowski+dt


On Mon, 06 Feb 2023 23:49:58 -0800, Saurabh Sengar wrote:
> Add dt-bindings for Hyper-V VMBus.
> 
> Signed-off-by: Saurabh Sengar <ssengar@linux.microsoft.com>
> ---
>  .../bindings/hypervisor/microsoft,vmbus.yaml       | 48 ++++++++++++++++++++++
>  MAINTAINERS                                        |  1 +
>  2 files changed, 49 insertions(+)
>  create mode 100644 Documentation/devicetree/bindings/hypervisor/microsoft,vmbus.yaml
> 

My bot found errors running 'make DT_CHECKER_FLAGS=-m dt_binding_check'
on your patch (DT_CHECKER_FLAGS is new in v5.13):

yamllint warnings/errors:

dtschema/dtc warnings/errors:
make[1]: *** Deleting file 'Documentation/devicetree/bindings/serial/brcm,bcm6345-uart.example.dtb'
make[1]: *** Waiting for unfinished jobs....
make: *** [Makefile:1508: dt_binding_check] Error 2

doc reference errors (make refcheckdocs):
Warning: MAINTAINERS references a file that doesn't exist: Documentation/devicetree/bindings/virtio/
MAINTAINERS: Documentation/devicetree/bindings/virtio/

See https://patchwork.ozlabs.org/project/devicetree-bindings/patch/1675756199-5917-6-git-send-email-ssengar@linux.microsoft.com

The base for the series is generally the latest rc1. A different dependency
should be noted in *this* patch.

If you already ran 'make dt_binding_check' and didn't see the above
error(s), then make sure 'yamllint' is installed and dt-schema is up to
date:

pip3 install dtschema --upgrade

Please check and re-submit after running the above command yourself. Note
that DT_SCHEMA_FILES can be set to your schema file to speed up checking
your schema. However, it must be unset to test all examples with your schema.


^ permalink raw reply	[flat|nested] 19+ messages in thread
* Re: [PATCH v4 5/6] dt-bindings: hypervisor: VMBus
  2023-02-07 13:00   ` Rob Herring
@ 2023-02-07 18:34     ` Rob Herring
  2023-02-08  2:50       ` Saurabh Singh Sengar
  0 siblings, 1 reply; 19+ messages in thread
From: Rob Herring @ 2023-02-07 18:34 UTC (permalink / raw)
  To: Saurabh Sengar
  Cc: mikelley, wei.liu, daniel.lezcano, devicetree, ssengar,
	virtualization, decui, haiyangz, linux-hyperv, dphadke, kys,
	linux-kernel, tglx, krzysztof.kozlowski+dt

On Tue, Feb 07, 2023 at 07:00:23AM -0600, Rob Herring wrote:
> 
> On Mon, 06 Feb 2023 23:49:58 -0800, Saurabh Sengar wrote:
> > Add dt-bindings for Hyper-V VMBus.
> > 
> > Signed-off-by: Saurabh Sengar <ssengar@linux.microsoft.com>
> > ---
> >  .../bindings/hypervisor/microsoft,vmbus.yaml       | 48 ++++++++++++++++++++++
> >  MAINTAINERS                                        |  1 +
> >  2 files changed, 49 insertions(+)
> >  create mode 100644 Documentation/devicetree/bindings/hypervisor/microsoft,vmbus.yaml
> > 
> 
> My bot found errors running 'make DT_CHECKER_FLAGS=-m dt_binding_check'
> on your patch (DT_CHECKER_FLAGS is new in v5.13):
> 
> yamllint warnings/errors:
> 
> dtschema/dtc warnings/errors:
> make[1]: *** Deleting file 'Documentation/devicetree/bindings/serial/brcm,bcm6345-uart.example.dtb'
> make[1]: *** Waiting for unfinished jobs....
> make: *** [Makefile:1508: dt_binding_check] Error 2

You can ignore this, it's a problem with the CI job.

> 
> doc reference errors (make refcheckdocs):
> Warning: MAINTAINERS references a file that doesn't exist: Documentation/devicetree/bindings/virtio/
> MAINTAINERS: Documentation/devicetree/bindings/virtio/

But this probably needs to be fixed.

Rob

^ permalink raw reply	[flat|nested] 19+ messages in thread
* Re: [PATCH v4 4/6] dt-bindings: hypervisor: Rename virtio to hypervisor
  2023-02-07  7:49 ` [PATCH v4 4/6] dt-bindings: hypervisor: Rename virtio to hypervisor Saurabh Sengar
@ 2023-02-07 18:39   ` Rob Herring
  2023-02-08  2:51     ` Saurabh Singh Sengar
  0 siblings, 1 reply; 19+ messages in thread
From: Rob Herring @ 2023-02-07 18:39 UTC (permalink / raw)
  To: Saurabh Sengar
  Cc: krzysztof.kozlowski+dt, kys, haiyangz, wei.liu, decui,
	daniel.lezcano, tglx, virtualization, devicetree, linux-kernel,
	linux-hyperv, mikelley, ssengar, dphadke

On Mon, Feb 06, 2023 at 11:49:57PM -0800, Saurabh Sengar wrote:
> Rename virtio folder to more generic hypervisor, so that this can
> accommodate more devices of similar type.
> 
> Signed-off-by: Saurabh Sengar <ssengar@linux.microsoft.com>
> ---
>  Documentation/devicetree/bindings/gpio/gpio-virtio.yaml               | 4 ++--
>  Documentation/devicetree/bindings/{virtio => hypervisor}/mmio.yaml    | 2 +-
>  .../devicetree/bindings/{virtio => hypervisor}/pci-iommu.yaml         | 2 +-
>  .../devicetree/bindings/{virtio => hypervisor}/virtio-device.yaml     | 2 +-
>  Documentation/devicetree/bindings/i2c/i2c-virtio.yaml                 | 4 ++--
>  MAINTAINERS                                                           | 2 +-
>  6 files changed, 8 insertions(+), 8 deletions(-)
>  rename Documentation/devicetree/bindings/{virtio => hypervisor}/mmio.yaml (95%)
>  rename Documentation/devicetree/bindings/{virtio => hypervisor}/pci-iommu.yaml (98%)
>  rename Documentation/devicetree/bindings/{virtio => hypervisor}/virtio-device.yaml (93%)

virtio is used for more than just an interface to hypervisors. I think 
this should remain. Instead, I'd put vmbus under bindings/bus/.

Rob

^ permalink raw reply	[flat|nested] 19+ messages in thread
* RE: [PATCH v4 1/6] drivers/clocksource/hyper-v: non ACPI support in hyperv clock
  2023-02-07  7:49 ` [PATCH v4 1/6] drivers/clocksource/hyper-v: non ACPI support in hyperv clock Saurabh Sengar
@ 2023-02-08  1:22   ` Michael Kelley (LINUX)
  0 siblings, 0 replies; 19+ messages in thread
From: Michael Kelley (LINUX) @ 2023-02-08  1:22 UTC (permalink / raw)
  To: Saurabh Sengar, robh+dt, krzysztof.kozlowski+dt, KY Srinivasan,
	Haiyang Zhang, wei.liu, Dexuan Cui, daniel.lezcano, tglx,
	virtualization, devicetree, linux-kernel, linux-hyperv,
	Saurabh Singh Sengar, dphadke

From: Saurabh Sengar <ssengar@linux.microsoft.com> Sent: Monday, February 6, 2023 11:50 PM
> 
> Add a placeholder function for the hv_setup_stimer0_irq API to accommodate
> systems without ACPI support. Since this function is not utilized on
> x86/x64 systems and non-ACPI support is only intended for x86/x64 systems,
> a placeholder function is sufficient for now and can be improved upon if
> necessary in the future.
> 
> This change will make it easier to add device tree support for VMBus in
> subsequent commits.
> 
> Signed-off-by: Saurabh Sengar <ssengar@linux.microsoft.com>
> ---
>  drivers/clocksource/hyperv_timer.c | 15 +++++++++++++--
>  1 file changed, 13 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/clocksource/hyperv_timer.c b/drivers/clocksource/hyperv_timer.c
> index c0cef92..f32948c 100644
> --- a/drivers/clocksource/hyperv_timer.c
> +++ b/drivers/clocksource/hyperv_timer.c
> @@ -49,7 +49,7 @@
> 
>  static int stimer0_irq = -1;
>  static int stimer0_message_sint;
> -static DEFINE_PER_CPU(long, stimer0_evt);
> +static __maybe_unused DEFINE_PER_CPU(long, stimer0_evt);
> 
>  /*
>   * Common code for stimer0 interrupts coming via Direct Mode or
> @@ -68,7 +68,7 @@ void hv_stimer0_isr(void)
>   * stimer0 interrupt handler for architectures that support
>   * per-cpu interrupts, which also implies Direct Mode.
>   */
> -static irqreturn_t hv_stimer0_percpu_isr(int irq, void *dev_id)
> +static irqreturn_t __maybe_unused hv_stimer0_percpu_isr(int irq, void *dev_id)
>  {
>  	hv_stimer0_isr();
>  	return IRQ_HANDLED;
> @@ -196,6 +196,7 @@ void __weak hv_remove_stimer0_handler(void)
>  {
>  };
> 
> +#ifdef CONFIG_ACPI
>  /* Called only on architectures with per-cpu IRQs (i.e., not x86/x64) */
>  static int hv_setup_stimer0_irq(void)
>  {
> @@ -230,6 +231,16 @@ static void hv_remove_stimer0_irq(void)
>  		stimer0_irq = -1;
>  	}
>  }
> +#else
> +static int hv_setup_stimer0_irq(void)
> +{
> +	return 0;
> +}
> +
> +static void hv_remove_stimer0_irq(void)
> +{
> +}
> +#endif
> 
>  /* hv_stimer_alloc - Global initialization of the clockevent and stimer0 */
>  int hv_stimer_alloc(bool have_percpu_irqs)
> --
> 1.8.3.1

Reviewed-by: Michael Kelley <mikelley@microsoft.com>


^ permalink raw reply	[flat|nested] 19+ messages in thread
* RE: [PATCH v4 2/6] Drivers: hv: allow non ACPI compilation for hv_is_hibernation_supported
  2023-02-07  7:49 ` [PATCH v4 2/6] Drivers: hv: allow non ACPI compilation for hv_is_hibernation_supported Saurabh Sengar
@ 2023-02-08  1:35   ` Michael Kelley (LINUX)
  0 siblings, 0 replies; 19+ messages in thread
From: Michael Kelley (LINUX) @ 2023-02-08  1:35 UTC (permalink / raw)
  To: Saurabh Sengar, robh+dt, krzysztof.kozlowski+dt, KY Srinivasan,
	Haiyang Zhang, wei.liu, Dexuan Cui, daniel.lezcano, tglx,
	virtualization, devicetree, linux-kernel, linux-hyperv,
	Saurabh Singh Sengar, dphadke

From: Saurabh Sengar <ssengar@linux.microsoft.com> Sent: Monday, February 6, 2023 11:50 PM
> 
> acpi_sleep_state_supported API is only define for CONFIG_ACPI flag and
> thus it can't be used for non-ACPI builds. Initially there won't be
> hibernation support for non ACPI builds.
> 
> This change will help adding device tree support in subsequent commits.

In keeping with the guideline to avoid references like "this patch" or "this
change" in commit messages, I'd suggest wording the commit message
something like the following:

acpi_sleep_state_supported() currently is defined only when
CONFIG_ACPI=y.  For future work to enable device tree builds, put this
function under #ifdef CONFIG_ACPI.  Otherwise, return 'false' from
hv_is_hibernation_supported() as Hyper-V guest configs using device
tree don't support hibernation.

With that update,
Reviewed-by: Michael Kelley

I gave a Reviewed-by on Patch 1 of this series, but the same comment
applies about "this change" in that commit message.

Michael

> 
> Signed-off-by: Saurabh Sengar <ssengar@linux.microsoft.com>
> ---
>  drivers/hv/hv_common.c | 4 ++++
>  1 file changed, 4 insertions(+)
> 
> diff --git a/drivers/hv/hv_common.c b/drivers/hv/hv_common.c
> index 52a6f89..370ec20 100644
> --- a/drivers/hv/hv_common.c
> +++ b/drivers/hv/hv_common.c
> @@ -234,7 +234,11 @@ void hv_setup_dma_ops(struct device *dev, bool coherent)
> 
>  bool hv_is_hibernation_supported(void)
>  {
> +#ifdef CONFIG_ACPI
>  	return !hv_root_partition && acpi_sleep_state_supported(ACPI_STATE_S4);
> +#else
> +	return false;
> +#endif
>  }
>  EXPORT_SYMBOL_GPL(hv_is_hibernation_supported);
> 
> --
> 1.8.3.1


^ permalink raw reply	[flat|nested] 19+ messages in thread
* RE: [PATCH v4 3/6] Drivers: hv: vmbus: Convert acpi_device to more generic platform_device
  2023-02-07  7:49 ` [PATCH v4 3/6] Drivers: hv: vmbus: Convert acpi_device to more generic platform_device Saurabh Sengar
@ 2023-02-08  1:50   ` Michael Kelley (LINUX)
  0 siblings, 0 replies; 19+ messages in thread
From: Michael Kelley (LINUX) @ 2023-02-08  1:50 UTC (permalink / raw)
  To: Saurabh Sengar, robh+dt, krzysztof.kozlowski+dt, KY Srinivasan,
	Haiyang Zhang, wei.liu, Dexuan Cui, daniel.lezcano, tglx,
	virtualization, devicetree, linux-kernel, linux-hyperv,
	Saurabh Singh Sengar, dphadke

From: Saurabh Sengar <ssengar@linux.microsoft.com> Sent: Monday, February 6, 2023 11:50 PM
> 
> Use more generic platform device instead of acpi device. Also rename the
> function vmbus_acpi_remove to more generic name vmbus_mmio_remove.

Let me suggest a slightly expanded commit message along these lines:

VMBus driver code currently has direct dependency on ACPI and struct
acpi_device.  As a staging step toward optionally configuring based on
device tree instead of ACPI, use a more generic platform device to reduce
the dependency on ACPI where possible, though the dependency on ACPI
is not completely removed.  Also rename the function vmbus_acpi_remove()
to the more generic vmbus_mmio_remove().

With this tweak,

Reviewed-by: Michael Kelley <mikelley@microsoft.com>

> 
> Signed-off-by: Saurabh Sengar <ssengar@linux.microsoft.com>
> ---
> [V4]
> - rebased which fixed return type of 'vmbus_mmio_remove' from int to void
> 
>  drivers/hv/vmbus_drv.c | 58 ++++++++++++++++++++++++++++++--------------------
>  1 file changed, 35 insertions(+), 23 deletions(-)
> 
> diff --git a/drivers/hv/vmbus_drv.c b/drivers/hv/vmbus_drv.c
> index d24dd65..7349715 100644
> --- a/drivers/hv/vmbus_drv.c
> +++ b/drivers/hv/vmbus_drv.c
> @@ -12,6 +12,7 @@
>  #include <linux/init.h>
>  #include <linux/module.h>
>  #include <linux/device.h>
> +#include <linux/platform_device.h>
>  #include <linux/interrupt.h>
>  #include <linux/sysctl.h>
>  #include <linux/slab.h>
> @@ -44,7 +45,7 @@ struct vmbus_dynid {
>  	struct hv_vmbus_device_id id;
>  };
> 
> -static struct acpi_device  *hv_acpi_dev;
> +static struct device  *hv_dev;
> 
>  static int hyperv_cpuhp_online;
> 
> @@ -143,7 +144,7 @@ static int hv_die_panic_notify_crash(struct notifier_block *self,
> 
>  static int vmbus_exists(void)
>  {
> -	if (hv_acpi_dev == NULL)
> +	if (hv_dev == NULL)
>  		return -ENODEV;
> 
>  	return 0;
> @@ -932,7 +933,7 @@ static int vmbus_dma_configure(struct device *child_device)
>  	 * On x86/x64 coherence is assumed and these calls have no effect.
>  	 */
>  	hv_setup_dma_ops(child_device,
> -		device_get_dma_attr(&hv_acpi_dev->dev) == DEV_DMA_COHERENT);
> +		device_get_dma_attr(hv_dev) == DEV_DMA_COHERENT);
>  	return 0;
>  }
> 
> @@ -2090,7 +2091,7 @@ int vmbus_device_register(struct hv_device
> *child_device_obj)
>  		     &child_device_obj->channel->offermsg.offer.if_instance);
> 
>  	child_device_obj->device.bus = &hv_bus;
> -	child_device_obj->device.parent = &hv_acpi_dev->dev;
> +	child_device_obj->device.parent = hv_dev;
>  	child_device_obj->device.release = vmbus_device_release;
> 
>  	child_device_obj->device.dma_parms = &child_device_obj->dma_parms;
> @@ -2262,7 +2263,7 @@ static acpi_status vmbus_walk_resources(struct
> acpi_resource *res, void *ctx)
>  	return AE_OK;
>  }
> 
> -static void vmbus_acpi_remove(struct acpi_device *device)
> +static void vmbus_mmio_remove(void)
>  {
>  	struct resource *cur_res;
>  	struct resource *next_res;
> @@ -2441,13 +2442,14 @@ void vmbus_free_mmio(resource_size_t start,
> resource_size_t size)
>  }
>  EXPORT_SYMBOL_GPL(vmbus_free_mmio);
> 
> -static int vmbus_acpi_add(struct acpi_device *device)
> +static int vmbus_acpi_add(struct platform_device *pdev)
>  {
>  	acpi_status result;
>  	int ret_val = -ENODEV;
>  	struct acpi_device *ancestor;
> +	struct acpi_device *device = ACPI_COMPANION(&pdev->dev);
> 
> -	hv_acpi_dev = device;
> +	hv_dev = &device->dev;
> 
>  	/*
>  	 * Older versions of Hyper-V for ARM64 fail to include the _CCA
> @@ -2489,10 +2491,21 @@ static int vmbus_acpi_add(struct acpi_device *device)
> 
>  acpi_walk_err:
>  	if (ret_val)
> -		vmbus_acpi_remove(device);
> +		vmbus_mmio_remove();
>  	return ret_val;
>  }
> 
> +static int vmbus_platform_driver_probe(struct platform_device *pdev)
> +{
> +	return vmbus_acpi_add(pdev);
> +}
> +
> +static int vmbus_platform_driver_remove(struct platform_device *pdev)
> +{
> +	vmbus_mmio_remove();
> +	return 0;
> +}
> +
>  #ifdef CONFIG_PM_SLEEP
>  static int vmbus_bus_suspend(struct device *dev)
>  {
> @@ -2658,15 +2671,15 @@ static int vmbus_bus_resume(struct device *dev)
>  	.restore_noirq	= vmbus_bus_resume
>  };
> 
> -static struct acpi_driver vmbus_acpi_driver = {
> -	.name = "vmbus",
> -	.ids = vmbus_acpi_device_ids,
> -	.ops = {
> -		.add = vmbus_acpi_add,
> -		.remove = vmbus_acpi_remove,
> -	},
> -	.drv.pm = &vmbus_bus_pm,
> -	.drv.probe_type = PROBE_FORCE_SYNCHRONOUS,
> +static struct platform_driver vmbus_platform_driver = {
> +	.probe = vmbus_platform_driver_probe,
> +	.remove = vmbus_platform_driver_remove,
> +	.driver = {
> +		.name = "vmbus",
> +		.acpi_match_table = ACPI_PTR(vmbus_acpi_device_ids),
> +		.pm = &vmbus_bus_pm,
> +		.probe_type = PROBE_FORCE_SYNCHRONOUS,
> +	}
>  };
> 
>  static void hv_kexec_handler(void)
> @@ -2750,12 +2763,11 @@ static int __init hv_acpi_init(void)
>  	/*
>  	 * Get ACPI resources first.
>  	 */
> -	ret = acpi_bus_register_driver(&vmbus_acpi_driver);
> -
> +	ret = platform_driver_register(&vmbus_platform_driver);
>  	if (ret)
>  		return ret;
> 
> -	if (!hv_acpi_dev) {
> +	if (!hv_dev) {
>  		ret = -ENODEV;
>  		goto cleanup;
>  	}
> @@ -2785,8 +2797,8 @@ static int __init hv_acpi_init(void)
>  	return 0;
> 
>  cleanup:
> -	acpi_bus_unregister_driver(&vmbus_acpi_driver);
> -	hv_acpi_dev = NULL;
> +	platform_driver_unregister(&vmbus_platform_driver);
> +	hv_dev = NULL;
>  	return ret;
>  }
> 
> @@ -2839,7 +2851,7 @@ static void __exit vmbus_exit(void)
> 
>  	cpuhp_remove_state(hyperv_cpuhp_online);
>  	hv_synic_free();
> -	acpi_bus_unregister_driver(&vmbus_acpi_driver);
> +	platform_driver_unregister(&vmbus_platform_driver);
>  }
> 
> 
> --
> 1.8.3.1


^ permalink raw reply	[flat|nested] 19+ messages in thread
* Re: [PATCH v4 5/6] dt-bindings: hypervisor: VMBus
  2023-02-07 18:34     ` Rob Herring
@ 2023-02-08  2:50       ` Saurabh Singh Sengar
  0 siblings, 0 replies; 19+ messages in thread
From: Saurabh Singh Sengar @ 2023-02-08  2:50 UTC (permalink / raw)
  To: Rob Herring
  Cc: mikelley, wei.liu, daniel.lezcano, devicetree, ssengar,
	virtualization, decui, haiyangz, linux-hyperv, dphadke, kys,
	linux-kernel, tglx, krzysztof.kozlowski+dt

On Tue, Feb 07, 2023 at 12:34:58PM -0600, Rob Herring wrote:
> On Tue, Feb 07, 2023 at 07:00:23AM -0600, Rob Herring wrote:
> > 
> > On Mon, 06 Feb 2023 23:49:58 -0800, Saurabh Sengar wrote:
> > > Add dt-bindings for Hyper-V VMBus.
> > > 
> > > Signed-off-by: Saurabh Sengar <ssengar@linux.microsoft.com>
> > > ---
> > >  .../bindings/hypervisor/microsoft,vmbus.yaml       | 48 ++++++++++++++++++++++
> > >  MAINTAINERS                                        |  1 +
> > >  2 files changed, 49 insertions(+)
> > >  create mode 100644 Documentation/devicetree/bindings/hypervisor/microsoft,vmbus.yaml
> > > 
> > 
> > My bot found errors running 'make DT_CHECKER_FLAGS=-m dt_binding_check'
> > on your patch (DT_CHECKER_FLAGS is new in v5.13):
> > 
> > yamllint warnings/errors:
> > 
> > dtschema/dtc warnings/errors:
> > make[1]: *** Deleting file 'Documentation/devicetree/bindings/serial/brcm,bcm6345-uart.example.dtb'
> > make[1]: *** Waiting for unfinished jobs....
> > make: *** [Makefile:1508: dt_binding_check] Error 2
> 
> You can ignore this, it's a problem with the CI job.
> 
> > 
> > doc reference errors (make refcheckdocs):
> > Warning: MAINTAINERS references a file that doesn't exist: Documentation/devicetree/bindings/virtio/
> > MAINTAINERS: Documentation/devicetree/bindings/virtio/
> 
> But this probably needs to be fixed.

I have updated MAINTAINERS as part of 4/6 patch, and there is no mention of
Documentation/devicetree/bindings/virtio/ in MAINTAINERS post 4/6 patch.
I have ran the tool locally as well on top of 4/6 and then 5/6 but it
never reported this error.

Anyway as per your latest comment I should be moving VMBus to bus folder
instead, so no need to worry about this.

Regards,
Saurabh

> 
> Rob

^ permalink raw reply	[flat|nested] 19+ messages in thread
* Re: [PATCH v4 4/6] dt-bindings: hypervisor: Rename virtio to hypervisor
  2023-02-07 18:39   ` Rob Herring
@ 2023-02-08  2:51     ` Saurabh Singh Sengar
  0 siblings, 0 replies; 19+ messages in thread
From: Saurabh Singh Sengar @ 2023-02-08  2:51 UTC (permalink / raw)
  To: Rob Herring
  Cc: krzysztof.kozlowski+dt, kys, haiyangz, wei.liu, decui,
	daniel.lezcano, tglx, virtualization, devicetree, linux-kernel,
	linux-hyperv, mikelley, ssengar, dphadke

On Tue, Feb 07, 2023 at 12:39:31PM -0600, Rob Herring wrote:
> On Mon, Feb 06, 2023 at 11:49:57PM -0800, Saurabh Sengar wrote:
> > Rename virtio folder to more generic hypervisor, so that this can
> > accommodate more devices of similar type.
> > 
> > Signed-off-by: Saurabh Sengar <ssengar@linux.microsoft.com>
> > ---
> >  Documentation/devicetree/bindings/gpio/gpio-virtio.yaml               | 4 ++--
> >  Documentation/devicetree/bindings/{virtio => hypervisor}/mmio.yaml    | 2 +-
> >  .../devicetree/bindings/{virtio => hypervisor}/pci-iommu.yaml         | 2 +-
> >  .../devicetree/bindings/{virtio => hypervisor}/virtio-device.yaml     | 2 +-
> >  Documentation/devicetree/bindings/i2c/i2c-virtio.yaml                 | 4 ++--
> >  MAINTAINERS                                                           | 2 +-
> >  6 files changed, 8 insertions(+), 8 deletions(-)
> >  rename Documentation/devicetree/bindings/{virtio => hypervisor}/mmio.yaml (95%)
> >  rename Documentation/devicetree/bindings/{virtio => hypervisor}/pci-iommu.yaml (98%)
> >  rename Documentation/devicetree/bindings/{virtio => hypervisor}/virtio-device.yaml (93%)
> 
> virtio is used for more than just an interface to hypervisors. I think 
> this should remain. Instead, I'd put vmbus under bindings/bus/.

Agree, will move to bus in v5

> 
> Rob

^ permalink raw reply	[flat|nested] 19+ messages in thread
* Re: [PATCH v4 6/6] Driver: VMBus: Add device tree support
  2023-02-07  7:49 ` [PATCH v4 6/6] Driver: VMBus: Add device tree support Saurabh Sengar
@ 2023-02-08  8:22   ` kernel test robot
  2023-02-08 10:25     ` Krzysztof Kozlowski
  0 siblings, 1 reply; 19+ messages in thread
From: kernel test robot @ 2023-02-08  8:22 UTC (permalink / raw)
  To: Saurabh Sengar, robh+dt, krzysztof.kozlowski+dt, kys, haiyangz,
	wei.liu, decui, daniel.lezcano, tglx, virtualization, devicetree,
	linux-kernel, linux-hyperv, mikelley, ssengar, dphadke
  Cc: llvm, oe-kbuild-all

Hi Saurabh,

Thank you for the patch! Perhaps something to improve:

[auto build test WARNING on next-20230207]
[cannot apply to robh/for-next tip/timers/core brgl/gpio/for-next wsa/i2c/for-next linus/master v6.2-rc7 v6.2-rc6 v6.2-rc5 v6.2-rc7]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Saurabh-Sengar/drivers-clocksource-hyper-v-non-ACPI-support-in-hyperv-clock/20230207-155113
patch link:    https://lore.kernel.org/r/1675756199-5917-7-git-send-email-ssengar%40linux.microsoft.com
patch subject: [PATCH v4 6/6] Driver: VMBus: Add device tree support
config: i386-randconfig-a015 (https://download.01.org/0day-ci/archive/20230208/202302081621.odizDzHG-lkp@intel.com/config)
compiler: clang version 14.0.6 (https://github.com/llvm/llvm-project f28c006a5895fc0e329fe15fead81e37457cb1d1)
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/intel-lab-lkp/linux/commit/b3cd029f78e9c1f5cd1633e1ffc7c5a09deae98f
        git remote add linux-review https://github.com/intel-lab-lkp/linux
        git fetch --no-tags linux-review Saurabh-Sengar/drivers-clocksource-hyper-v-non-ACPI-support-in-hyperv-clock/20230207-155113
        git checkout b3cd029f78e9c1f5cd1633e1ffc7c5a09deae98f
        # save the config file
        mkdir build_dir && cp config build_dir/.config
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=i386 olddefconfig
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=i386 SHELL=/bin/bash drivers/hv/

If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@intel.com>

All warnings (new ones prefixed by >>):

>> drivers/hv/vmbus_drv.c:2691:21: warning: attribute declaration must precede definition [-Wignored-attributes]
   static const struct __maybe_unused of_device_id vmbus_of_match[] = {
                       ^
   include/linux/compiler_attributes.h:355:56: note: expanded from macro '__maybe_unused'
   #define __maybe_unused                  __attribute__((__unused__))
                                                          ^
   include/linux/mod_devicetable.h:268:8: note: previous definition is here
   struct of_device_id {
          ^
   1 warning generated.


vim +2691 drivers/hv/vmbus_drv.c

  2690	
> 2691	static const struct __maybe_unused of_device_id vmbus_of_match[] = {
  2692		{
  2693			.compatible = "microsoft,vmbus",
  2694		},
  2695		{
  2696			/* sentinel */
  2697		},
  2698	};
  2699	MODULE_DEVICE_TABLE(of, vmbus_of_match);
  2700	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests

^ permalink raw reply	[flat|nested] 19+ messages in thread
* Re: [PATCH v4 6/6] Driver: VMBus: Add device tree support
  2023-02-08  8:22   ` kernel test robot
@ 2023-02-08 10:25     ` Krzysztof Kozlowski
  2023-02-08 14:39       ` Nathan Chancellor
  0 siblings, 1 reply; 19+ messages in thread
From: Krzysztof Kozlowski @ 2023-02-08 10:25 UTC (permalink / raw)
  To: kernel test robot, Saurabh Sengar, robh+dt,
	krzysztof.kozlowski+dt, kys, haiyangz, wei.liu, decui,
	daniel.lezcano, tglx, virtualization, devicetree, linux-kernel,
	linux-hyperv, mikelley, ssengar, dphadke
  Cc: llvm, oe-kbuild-all

On 08/02/2023 09:22, kernel test robot wrote:
> Hi Saurabh,
> 
> Thank you for the patch! Perhaps something to improve:
> 
> [auto build test WARNING on next-20230207]
> [cannot apply to robh/for-next tip/timers/core brgl/gpio/for-next wsa/i2c/for-next linus/master v6.2-rc7 v6.2-rc6 v6.2-rc5 v6.2-rc7]
> [If your patch is applied to the wrong git tree, kindly drop us a note.
> And when submitting patch, we suggest to use '--base' as documented in
> https://git-scm.com/docs/git-format-patch#_base_tree_information]
> 

All of your recent patches have build errors. Can you at least build
test them before sending? It's a unnecessary noise in our mailboxes to
get non-buildable patches, just to trigger compilation which you can
easily do by your own. GCC is a free software...

Best regards,
Krzysztof


^ permalink raw reply	[flat|nested] 19+ messages in thread
* Re: [PATCH v4 6/6] Driver: VMBus: Add device tree support
  2023-02-08 10:25     ` Krzysztof Kozlowski
@ 2023-02-08 14:39       ` Nathan Chancellor
  2023-02-08 15:36         ` Krzysztof Kozlowski
  0 siblings, 1 reply; 19+ messages in thread
From: Nathan Chancellor @ 2023-02-08 14:39 UTC (permalink / raw)
  To: Krzysztof Kozlowski
  Cc: kernel test robot, Saurabh Sengar, robh+dt,
	krzysztof.kozlowski+dt, kys, haiyangz, wei.liu, decui,
	daniel.lezcano, tglx, virtualization, devicetree, linux-kernel,
	linux-hyperv, mikelley, ssengar, dphadke, llvm, oe-kbuild-all

On Wed, Feb 08, 2023 at 11:25:57AM +0100, Krzysztof Kozlowski wrote:
> On 08/02/2023 09:22, kernel test robot wrote:
> > Hi Saurabh,
> > 
> > Thank you for the patch! Perhaps something to improve:
> > 
> > [auto build test WARNING on next-20230207]
> > [cannot apply to robh/for-next tip/timers/core brgl/gpio/for-next wsa/i2c/for-next linus/master v6.2-rc7 v6.2-rc6 v6.2-rc5 v6.2-rc7]
> > [If your patch is applied to the wrong git tree, kindly drop us a note.
> > And when submitting patch, we suggest to use '--base' as documented in
> > https://git-scm.com/docs/git-format-patch#_base_tree_information]
> > 
> 
> All of your recent patches have build errors. Can you at least build
> test them before sending? It's a unnecessary noise in our mailboxes to
> get non-buildable patches, just to trigger compilation which you can
> easily do by your own. GCC is a free software...

For what it's worth, GCC does not have a warning like this, it just
accepts the incorrect location of the attribute, which has gotten others
in trouble before:

https://lore.kernel.org/CAHk-=wgf+kHeSZbpkZumWcTXUD7ordqTMvPRNL6aQVG1DSBDnQ@mail.gmail.com/

So the patch probably did build clean with GCC but that is one of the
reasons that there is no longer a compiler monopoly for the kernel ;)

Cheers,
Nathan

^ permalink raw reply	[flat|nested] 19+ messages in thread
* Re: [PATCH v4 6/6] Driver: VMBus: Add device tree support
  2023-02-08 14:39       ` Nathan Chancellor
@ 2023-02-08 15:36         ` Krzysztof Kozlowski
  0 siblings, 0 replies; 19+ messages in thread
From: Krzysztof Kozlowski @ 2023-02-08 15:36 UTC (permalink / raw)
  To: Nathan Chancellor
  Cc: kernel test robot, Saurabh Sengar, robh+dt,
	krzysztof.kozlowski+dt, kys, haiyangz, wei.liu, decui,
	daniel.lezcano, tglx, virtualization, devicetree, linux-kernel,
	linux-hyperv, mikelley, ssengar, dphadke, llvm, oe-kbuild-all

On 08/02/2023 15:39, Nathan Chancellor wrote:
> On Wed, Feb 08, 2023 at 11:25:57AM +0100, Krzysztof Kozlowski wrote:
>> On 08/02/2023 09:22, kernel test robot wrote:
>>> Hi Saurabh,
>>>
>>> Thank you for the patch! Perhaps something to improve:
>>>
>>> [auto build test WARNING on next-20230207]
>>> [cannot apply to robh/for-next tip/timers/core brgl/gpio/for-next wsa/i2c/for-next linus/master v6.2-rc7 v6.2-rc6 v6.2-rc5 v6.2-rc7]
>>> [If your patch is applied to the wrong git tree, kindly drop us a note.
>>> And when submitting patch, we suggest to use '--base' as documented in
>>> https://git-scm.com/docs/git-format-patch#_base_tree_information]
>>>
>>
>> All of your recent patches have build errors. Can you at least build
>> test them before sending? It's a unnecessary noise in our mailboxes to
>> get non-buildable patches, just to trigger compilation which you can
>> easily do by your own. GCC is a free software...
> 
> For what it's worth, GCC does not have a warning like this, it just
> accepts the incorrect location of the attribute, which has gotten others
> in trouble before:
> 
> https://lore.kernel.org/CAHk-=wgf+kHeSZbpkZumWcTXUD7ordqTMvPRNL6aQVG1DSBDnQ@mail.gmail.com/
> 
> So the patch probably did build clean with GCC but that is one of the
> reasons that there is no longer a compiler monopoly for the kernel ;)

OK then the patchset is reasonable/built enough.

Best regards,
Krzysztof


^ permalink raw reply	[flat|nested] 19+ messages in thread
end of thread, other threads:[~2023-02-08 15:36 UTC | newest]

Thread overview: 19+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2023-02-07  7:49 [PATCH v4 0/6] Device tree support for Hyper-V VMBus driver Saurabh Sengar
2023-02-07  7:49 ` [PATCH v4 1/6] drivers/clocksource/hyper-v: non ACPI support in hyperv clock Saurabh Sengar
2023-02-08  1:22   ` Michael Kelley (LINUX)
2023-02-07  7:49 ` [PATCH v4 2/6] Drivers: hv: allow non ACPI compilation for hv_is_hibernation_supported Saurabh Sengar
2023-02-08  1:35   ` Michael Kelley (LINUX)
2023-02-07  7:49 ` [PATCH v4 3/6] Drivers: hv: vmbus: Convert acpi_device to more generic platform_device Saurabh Sengar
2023-02-08  1:50   ` Michael Kelley (LINUX)
2023-02-07  7:49 ` [PATCH v4 4/6] dt-bindings: hypervisor: Rename virtio to hypervisor Saurabh Sengar
2023-02-07 18:39   ` Rob Herring
2023-02-08  2:51     ` Saurabh Singh Sengar
2023-02-07  7:49 ` [PATCH v4 5/6] dt-bindings: hypervisor: VMBus Saurabh Sengar
2023-02-07 13:00   ` Rob Herring
2023-02-07 18:34     ` Rob Herring
2023-02-08  2:50       ` Saurabh Singh Sengar
2023-02-07  7:49 ` [PATCH v4 6/6] Driver: VMBus: Add device tree support Saurabh Sengar
2023-02-08  8:22   ` kernel test robot
2023-02-08 10:25     ` Krzysztof Kozlowski
2023-02-08 14:39       ` Nathan Chancellor
2023-02-08 15:36         ` Krzysztof Kozlowski

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