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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [PATCH v7 5/7] xen/asm-generic: introduce generic device.h
Arm, PPC and RISC-V use the same device.h thereby device.h
was moved to asm-generic. Arm's device.h was taken as a base with
the following changes:
- #ifdef PCI related things.
- #ifdef ACPI related things.
- Rename #ifdef guards.
- Add SPDX tag.
- #ifdef CONFIG_HAS_DEVICE_TREE related things.
- #ifdef-ing iommu related things with CONFIG_HAS_PASSTHROUGH.
Signed-off-by: Oleksii Kurochko <oleksii.kurochko@xxxxxxxxx>
---
Changes in V7:
- keeping DEVICE_PCI_HOSTBRIDGE available for every build based on the reply:
https://lore.kernel.org/xen-devel/926a5c12-7f02-42ec-92a8-1c82d060c710@xxxxxxx/
- add comment above enum device_type.h with explanation about DEV_TYPE_MAX.
- separate patch "[PATCH v6 9/9] xen/asm-generic: introduce generic device.h"
into 3 patches.
---
Changes in V6:
- Rebase only.
---
Changes in V5:
- Removed generated file: xen/include/headers++.chk.new
- Removed pointless #ifdef CONFIG_HAS_DEVICE_TREE ... #endif for PPC as
CONFIG_HAS_DEVICE_TREE will be always used for PPC.
---
Changes in V4:
- Updated the commit message
- Switched Arm and PPC to asm-generic version of device.h
- Replaced HAS_PCI with CONFIG_HAS_PCI
- ifdef-ing iommu filed of dev_archdata struct with CONFIG_HAS_PASSTHROUGH
- ifdef-ing iommu_fwspec of device struct with CONFIG_HAS_PASSTHROUGH
- ifdef-ing DT related things with CONFIG_HAS_DEVICE_TREE
- Updated the commit message ( remove a note with question about
if device.h should be in asm-generic or not )
- Replaced DEVICE_IC with DEVICE_INTERRUPT_CONTROLLER
- Rationalized usage of CONFIG_HAS_* in device.h
- Fixed indents for ACPI_DEVICE_START and ACPI_DEVICE_END
---
Changes in V3:
- ifdef device tree related things.
- update the commit message
---
Changes in V2:
- take ( as common ) device.h from Arm as PPC and RISC-V use it as a
base.
- #ifdef PCI related things.
- #ifdef ACPI related things.
- rename DEVICE_GIC to DEVIC_IC.
- rename #ifdef guards.
- switch Arm and PPC to generic device.h
- add SPDX tag
- update the commit message
---
xen/include/asm-generic/device.h | 162 +++++++++++++++++++++++++++++++
1 file changed, 162 insertions(+)
create mode 100644 xen/include/asm-generic/device.h
diff --git a/xen/include/asm-generic/device.h b/xen/include/asm-generic/device.h
new file mode 100644
index 0000000000..f12b30dc43
--- /dev/null
+++ b/xen/include/asm-generic/device.h
@@ -0,0 +1,162 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+#ifndef __ASM_GENERIC_DEVICE_H__
+#define __ASM_GENERIC_DEVICE_H__
+
+#include <xen/stdbool.h>
+
+/*
+ * DEV_TYPE_MAX is currently not in use, but it was added because the enum may
+ * be empty when !HAS_DEVICE_TREE and !HAS_PCI, which could lead to
+ * a compilation error.
+ */
+enum device_type
+{
+#ifdef CONFIG_HAS_DEVICE_TREE
+ DEV_DT,
+#endif
+
+#ifdef CONFIG_HAS_PCI
+ DEV_PCI,
+#endif
+ DEV_TYPE_MAX,
+};
+
+enum device_class
+{
+ DEVICE_SERIAL,
+ DEVICE_IOMMU,
+ DEVICE_INTERRUPT_CONTROLLER,
+ DEVICE_PCI_HOSTBRIDGE,
+ /* Use for error */
+ DEVICE_UNKNOWN,
+};
+
+struct dev_archdata {
+#ifdef CONFIG_HAS_PASSTHROUGH
+ void *iommu; /* IOMMU private data */
+#endif
+};
+
+/* struct device - The basic device structure */
+struct device
+{
+ enum device_type type;
+#ifdef CONFIG_HAS_DEVICE_TREE
+ struct dt_device_node *of_node; /* Used by drivers imported from Linux */
+#endif
+ struct dev_archdata archdata;
+#ifdef CONFIG_HAS_PASSTHROUGH
+ struct iommu_fwspec *iommu_fwspec; /* per-device IOMMU instance data */
+#endif
+};
+
+typedef struct device device_t;
+
+#ifdef CONFIG_HAS_DEVICE_TREE
+
+#include <xen/device_tree.h>
+
+#define dev_is_dt(dev) ((dev)->type == DEV_DT)
+
+/**
+ * device_init - Initialize a device
+ * @dev: device to initialize
+ * @class: class of the device (serial, network...)
+ * @data: specific data for initializing the device
+ *
+ * Return 0 on success.
+ */
+int device_init(struct dt_device_node *dev, enum device_class class,
+ const void *data);
+
+/**
+ * device_get_type - Get the type of the device
+ * @dev: device to match
+ *
+ * Return the device type on success or DEVICE_ANY on failure
+ */
+enum device_class device_get_class(const struct dt_device_node *dev);
+
+#define DT_DEVICE_START(_name, _namestr, _class) \
+static const struct device_desc __dev_desc_##_name __used \
+__section(".dev.info") = { \
+ .name = _namestr, \
+ .class = _class, \
+
+#define DT_DEVICE_END \
+};
+
+#else /* !CONFIG_HAS_DEVICE_TREE */
+#define dev_is_dt(dev) ((void)(dev), false)
+#endif /* CONFIG_HAS_DEVICE_TREE */
+
+#ifdef CONFIG_HAS_PCI
+#define dev_is_pci(dev) ((dev)->type == DEV_PCI)
+#else
+#define dev_is_pci(dev) ((void)(dev), false)
+#endif
+
+struct device_desc {
+ /* Device name */
+ const char *name;
+ /* Device class */
+ enum device_class class;
+
+#ifdef CONFIG_HAS_DEVICE_TREE
+
+ /* List of devices supported by this driver */
+ const struct dt_device_match *dt_match;
+ /*
+ * Device initialization.
+ *
+ * -EAGAIN is used to indicate that device probing is deferred.
+ */
+ int (*init)(struct dt_device_node *dev, const void *data);
+
+#endif
+};
+
+#ifdef CONFIG_ACPI
+
+struct acpi_device_desc {
+ /* Device name */
+ const char *name;
+ /* Device class */
+ enum device_class class;
+ /* type of device supported by the driver */
+ const int class_type;
+ /* Device initialization */
+ int (*init)(const void *data);
+};
+
+/**
+ * acpi_device_init - Initialize a device
+ * @class: class of the device (serial, network...)
+ * @data: specific data for initializing the device
+ *
+ * Return 0 on success.
+ */
+int acpi_device_init(enum device_class class,
+ const void *data, int class_type);
+
+#define ACPI_DEVICE_START(_name, _namestr, _class) \
+static const struct acpi_device_desc __dev_desc_##_name __used \
+__section(".adev.info") = { \
+ .name = _namestr, \
+ .class = _class, \
+
+#define ACPI_DEVICE_END \
+};
+
+#endif /* CONFIG_ACPI */
+
+#endif /* __ASM_GENERIC_DEVICE_H__ */
+
+/*
+ * Local variables:
+ * mode: C
+ * c-file-style: "BSD"
+ * c-basic-offset: 4
+ * indent-tabs-mode: nil
+ * End:
+ */
--
2.43.0
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