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authorJason Wang <jasowang@redhat.com>2021-01-04 09:55:00 +0300
committerMichael S. Tsirkin <mst@redhat.com>2021-02-23 15:52:58 +0300
commitfd502729fbbf6a76fdb7acae4506486bfbb7c4f6 (patch)
tree72fe5de3d38f2a2474fcdeed8c02552881f97d90 /include/linux/virtio_pci_modern.h
parent8000a6b602a4aec0f54a9131623a407d6d44a605 (diff)
downloadlinux-fd502729fbbf6a76fdb7acae4506486bfbb7c4f6.tar.xz
virtio-pci: introduce modern device module
Signed-off-by: Jason Wang <jasowang@redhat.com> Link: https://lore.kernel.org/r/20210104065503.199631-17-jasowang@redhat.com Including a bugfix: virtio: don't prompt CONFIG_VIRTIO_PCI_MODERN Cc: Arnd Bergmann <arnd@arndb.de> Cc: Anders Roxell <anders.roxell@linaro.org> Cc: Guenter Roeck <linux@roeck-us.net> Reported-by: Naresh Kamboju <naresh.kamboju@linaro.org> Fixes: 86b87c9d858b6 ("virtio-pci: introduce modern device module") Signed-off-by: Jason Wang <jasowang@redhat.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Link: https://lore.kernel.org/r/20210223061905.422659-2-jasowang@redhat.com Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'include/linux/virtio_pci_modern.h')
-rw-r--r--include/linux/virtio_pci_modern.h111
1 files changed, 111 insertions, 0 deletions
diff --git a/include/linux/virtio_pci_modern.h b/include/linux/virtio_pci_modern.h
new file mode 100644
index 000000000000..f26acbeec965
--- /dev/null
+++ b/include/linux/virtio_pci_modern.h
@@ -0,0 +1,111 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _LINUX_VIRTIO_PCI_MODERN_H
+#define _LINUX_VIRTIO_PCI_MODERN_H
+
+#include <linux/pci.h>
+#include <linux/virtio_pci.h>
+
+struct virtio_pci_modern_device {
+ struct pci_dev *pci_dev;
+
+ struct virtio_pci_common_cfg __iomem *common;
+ /* Device-specific data (non-legacy mode) */
+ void __iomem *device;
+ /* Base of vq notifications (non-legacy mode). */
+ void __iomem *notify_base;
+ /* Where to read and clear interrupt */
+ u8 __iomem *isr;
+
+ /* So we can sanity-check accesses. */
+ size_t notify_len;
+ size_t device_len;
+
+ /* Capability for when we need to map notifications per-vq. */
+ int notify_map_cap;
+
+ /* Multiply queue_notify_off by this value. (non-legacy mode). */
+ u32 notify_offset_multiplier;
+
+ int modern_bars;
+
+ struct virtio_device_id id;
+};
+
+/*
+ * Type-safe wrappers for io accesses.
+ * Use these to enforce at compile time the following spec requirement:
+ *
+ * The driver MUST access each field using the “natural” access
+ * method, i.e. 32-bit accesses for 32-bit fields, 16-bit accesses
+ * for 16-bit fields and 8-bit accesses for 8-bit fields.
+ */
+static inline u8 vp_ioread8(const u8 __iomem *addr)
+{
+ return ioread8(addr);
+}
+static inline u16 vp_ioread16 (const __le16 __iomem *addr)
+{
+ return ioread16(addr);
+}
+
+static inline u32 vp_ioread32(const __le32 __iomem *addr)
+{
+ return ioread32(addr);
+}
+
+static inline void vp_iowrite8(u8 value, u8 __iomem *addr)
+{
+ iowrite8(value, addr);
+}
+
+static inline void vp_iowrite16(u16 value, __le16 __iomem *addr)
+{
+ iowrite16(value, addr);
+}
+
+static inline void vp_iowrite32(u32 value, __le32 __iomem *addr)
+{
+ iowrite32(value, addr);
+}
+
+static inline void vp_iowrite64_twopart(u64 val,
+ __le32 __iomem *lo,
+ __le32 __iomem *hi)
+{
+ vp_iowrite32((u32)val, lo);
+ vp_iowrite32(val >> 32, hi);
+}
+
+u64 vp_modern_get_features(struct virtio_pci_modern_device *mdev);
+void vp_modern_set_features(struct virtio_pci_modern_device *mdev,
+ u64 features);
+u32 vp_modern_generation(struct virtio_pci_modern_device *mdev);
+u8 vp_modern_get_status(struct virtio_pci_modern_device *mdev);
+void vp_modern_set_status(struct virtio_pci_modern_device *mdev,
+ u8 status);
+u16 vp_modern_queue_vector(struct virtio_pci_modern_device *mdev,
+ u16 idx, u16 vector);
+u16 vp_modern_config_vector(struct virtio_pci_modern_device *mdev,
+ u16 vector);
+void vp_modern_queue_address(struct virtio_pci_modern_device *mdev,
+ u16 index, u64 desc_addr, u64 driver_addr,
+ u64 device_addr);
+void vp_modern_set_queue_enable(struct virtio_pci_modern_device *mdev,
+ u16 idx, bool enable);
+bool vp_modern_get_queue_enable(struct virtio_pci_modern_device *mdev,
+ u16 idx);
+void vp_modern_set_queue_size(struct virtio_pci_modern_device *mdev,
+ u16 idx, u16 size);
+u16 vp_modern_get_queue_size(struct virtio_pci_modern_device *mdev,
+ u16 idx);
+u16 vp_modern_get_num_queues(struct virtio_pci_modern_device *mdev);
+u16 vp_modern_get_queue_notify_off(struct virtio_pci_modern_device *mdev,
+ u16 idx);
+void __iomem *vp_modern_map_capability(struct virtio_pci_modern_device *mdev, int off,
+ size_t minlen,
+ u32 align,
+ u32 start, u32 size,
+ size_t *len);
+int vp_modern_probe(struct virtio_pci_modern_device *mdev);
+void vp_modern_remove(struct virtio_pci_modern_device *mdev);
+#endif