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See the GNU * General Public License for more details. * * The full GNU General Public License is included in this distribution in * the file called "COPYING". * * Intel MIC driver. * */ #ifndef __MIC_COMMON_H_ #define __MIC_COMMON_H_ #include #define __mic_align(a, x) (((a) + (x) - 1) & ~((x) - 1)) /** * struct mic_device_desc: Virtio device information shared between the * virtio driver and userspace backend * * @type: Device type: console/network/disk etc. Type 0/-1 terminates. * @num_vq: Number of virtqueues. * @feature_len: Number of bytes of feature bits. Multiply by 2: one for host features and one for guest acknowledgements. * @config_len: Number of bytes of the config array after virtqueues. * @status: A status byte, written by the Guest. * @config: Start of the following variable length config. */ struct mic_device_desc { __s8 type; __u8 num_vq; __u8 feature_len; __u8 config_len; __u8 status; __le64 config[0]; } __attribute__ ((aligned(8))); /** * struct mic_device_ctrl: Per virtio device information in the device page * used internally by the host and card side drivers. * * @vdev: Used for storing MIC vdev information by the guest. * @config_change: Set to 1 by host when a config change is requested. * @vdev_reset: Set to 1 by guest to indicate virtio device has been reset. * @guest_ack: Set to 1 by guest to ack a command. * @host_ack: Set to 1 by host to ack a command. * @used_address_updated: Set to 1 by guest when the used address should be * updated. * @c2h_vdev_db: The doorbell number to be used by guest. Set by host. * @h2c_vdev_db: The doorbell number to be used by host. Set by guest. */ struct mic_device_ctrl { __le64 vdev; __u8 config_change; __u8 vdev_reset; __u8 guest_ack; __u8 host_ack; __u8 used_address_updated; __s8 c2h_vdev_db; __s8 h2c_vdev_db; } __attribute__ ((aligned(8))); /** * struct mic_bootparam: Virtio device independent information in device page * * @magic: A magic value used by the card to ensure it can see the host * @h2c_config_db: Host to Card Virtio config doorbell set by card * @node_id: Unique id of the node * @h2c_scif_db - Host to card SCIF doorbell set by card * @c2h_scif_db - Card to host SCIF doorbell set by host * @scif_host_dma_addr - SCIF host queue pair DMA address * @scif_card_dma_addr - SCIF card queue pair DMA address */ struct mic_bootparam { __le32 magic; __s8 h2c_config_db; __u8 node_id; __u8 h2c_scif_db; __u8 c2h_scif_db; __u64 scif_host_dma_addr; __u64 scif_card_dma_addr; } __attribute__ ((aligned(8))); /** * struct mic_device_page: High level representation of the device page * * @bootparam: The bootparam structure is used for sharing information and * status updates between MIC host and card drivers. * @desc: Array of MIC virtio device descriptors. */ struct mic_device_page { struct mic_bootparam bootparam; struct mic_device_desc desc[0]; }; /** * struct mic_vqconfig: This is how we expect the device configuration field * for a virtqueue to be laid out in config space. * * @address: Guest/MIC physical address of the virtio ring * (avail and desc rings) * @used_address: Guest/MIC physical address of the used ring * @num: The number of entries in the virtio_ring */ struct mic_vqconfig { __le64 address; __le64 used_address; __le16 num; } __attribute__ ((aligned(8))); /* * The alignment to use between consumer and producer parts of vring. * This is pagesize for historical reasons. */ #define MIC_VIRTIO_RING_ALIGN 4096 #define MIC_MAX_VRINGS 4 #define MIC_VRING_ENTRIES 128 /* * Max vring entries (power of 2) to ensure desc and avail rings * fit in a single page */ #define MIC_MAX_VRING_ENTRIES 128 /** * Max size of the desc block in bytes: includes: * - struct mic_device_desc * - struct mic_vqconfig (num_vq of these) * - host and guest features * - virtio device config space */ #define MIC_MAX_DESC_BLK_SIZE 256 /** * struct _mic_vring_info - Host vring info exposed to userspace backend * for the avail index and magic for the card. * * @avail_idx: host avail idx * @magic: A magic debug cookie. */ struct _mic_vring_info { __u16 avail_idx; __le32 magic; }; /** * struct mic_vring - Vring information. * * @vr: The virtio ring. * @info: Host vring information exposed to the userspace backend for the * avail index and magic for the card. * @va: The va for the buffer allocated for vr and info. * @len: The length of the buffer required for allocating vr and info. */ struct mic_vring { struct vring vr; struct _mic_vring_info *info; void *va; int len; }; #define mic_aligned_desc_size(d) __mic_align(mic_desc_size(d), 8) #ifndef INTEL_MIC_CARD static __inline__ unsigned mic_desc_size(const struct mic_device_desc *desc) { return sizeof(*desc) + desc->num_vq * sizeof(struct mic_vqconfig) + desc->feature_len * 2 + desc->config_len; } static __inline__ struct mic_vqconfig * mic_vq_config(const struct mic_device_desc *desc) { return (struct mic_vqconfig *)(desc + 1); } static __inline__ __u8 *mic_vq_features(const struct mic_device_desc *desc) { return (__u8 *)(mic_vq_config(desc) + desc->num_vq); } static __inline__ __u8 *mic_vq_configspace(const struct mic_device_desc *desc) { return mic_vq_features(desc) + desc->feature_len * 2; } static __inline__ unsigned mic_total_desc_size(struct mic_device_desc *desc) { return mic_aligned_desc_size(desc) + sizeof(struct mic_device_ctrl); } #endif /* Device page size */ #define MIC_DP_SIZE 4096 #define MIC_MAGIC 0xc0ffee00 /** * enum mic_states - MIC states. */ enum mic_states { MIC_READY = 0, MIC_BOOTING, MIC_ONLINE, MIC_SHUTTING_DOWN, MIC_RESETTING, MIC_RESET_FAILED, MIC_LAST }; /** * enum mic_status - MIC status reported by card after * a host or card initiated shutdown or a card crash. */ enum mic_status { MIC_NOP = 0, MIC_CRASHED, MIC_HALTED, MIC_POWER_OFF, MIC_RESTART, MIC_STATUS_LAST }; #endif