diff options
Diffstat (limited to 'include')
| -rw-r--r-- | include/linux/coresight-stm.h | 6 | ||||
| -rw-r--r-- | include/linux/hyperv.h | 170 | ||||
| -rw-r--r-- | include/linux/mcb.h | 14 | ||||
| -rw-r--r-- | include/linux/nvmem-provider.h | 10 | ||||
| -rw-r--r-- | include/linux/stm.h | 3 | ||||
| -rw-r--r-- | include/uapi/linux/coresight-stm.h | 21 |
6 files changed, 220 insertions, 4 deletions
diff --git a/include/linux/coresight-stm.h b/include/linux/coresight-stm.h new file mode 100644 index 000000000000..a978bb85599a --- /dev/null +++ b/include/linux/coresight-stm.h @@ -0,0 +1,6 @@ +#ifndef __LINUX_CORESIGHT_STM_H_ +#define __LINUX_CORESIGHT_STM_H_ + +#include <uapi/linux/coresight-stm.h> + +#endif diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h index aa0fadce9308..b10954a66939 100644 --- a/include/linux/hyperv.h +++ b/include/linux/hyperv.h @@ -126,6 +126,8 @@ struct hv_ring_buffer_info { u32 ring_datasize; /* < ring_size */ u32 ring_data_startoffset; + u32 priv_write_index; + u32 priv_read_index; }; /* @@ -151,6 +153,33 @@ hv_get_ringbuffer_availbytes(struct hv_ring_buffer_info *rbi, *read = dsize - *write; } +static inline u32 hv_get_bytes_to_read(struct hv_ring_buffer_info *rbi) +{ + u32 read_loc, write_loc, dsize, read; + + dsize = rbi->ring_datasize; + read_loc = rbi->ring_buffer->read_index; + write_loc = READ_ONCE(rbi->ring_buffer->write_index); + + read = write_loc >= read_loc ? (write_loc - read_loc) : + (dsize - read_loc) + write_loc; + + return read; +} + +static inline u32 hv_get_bytes_to_write(struct hv_ring_buffer_info *rbi) +{ + u32 read_loc, write_loc, dsize, write; + + dsize = rbi->ring_datasize; + read_loc = READ_ONCE(rbi->ring_buffer->read_index); + write_loc = rbi->ring_buffer->write_index; + + write = write_loc >= read_loc ? dsize - (write_loc - read_loc) : + read_loc - write_loc; + return write; +} + /* * VMBUS version is 32 bit entity broken up into * two 16 bit quantities: major_number. minor_number. @@ -1091,7 +1120,7 @@ int vmbus_allocate_mmio(struct resource **new, struct hv_device *device_obj, resource_size_t min, resource_size_t max, resource_size_t size, resource_size_t align, bool fb_overlap_ok); - +void vmbus_free_mmio(resource_size_t start, resource_size_t size); int vmbus_cpu_number_to_vp_number(int cpu_number); u64 hv_do_hypercall(u64 control, void *input, void *output); @@ -1338,4 +1367,143 @@ extern __u32 vmbus_proto_version; int vmbus_send_tl_connect_request(const uuid_le *shv_guest_servie_id, const uuid_le *shv_host_servie_id); +void vmbus_set_event(struct vmbus_channel *channel); + +/* Get the start of the ring buffer. */ +static inline void * +hv_get_ring_buffer(struct hv_ring_buffer_info *ring_info) +{ + return (void *)ring_info->ring_buffer->buffer; +} + +/* + * To optimize the flow management on the send-side, + * when the sender is blocked because of lack of + * sufficient space in the ring buffer, potential the + * consumer of the ring buffer can signal the producer. + * This is controlled by the following parameters: + * + * 1. pending_send_sz: This is the size in bytes that the + * producer is trying to send. + * 2. The feature bit feat_pending_send_sz set to indicate if + * the consumer of the ring will signal when the ring + * state transitions from being full to a state where + * there is room for the producer to send the pending packet. + */ + +static inline bool hv_need_to_signal_on_read(struct hv_ring_buffer_info *rbi) +{ + u32 cur_write_sz; + u32 pending_sz; + + /* + * Issue a full memory barrier before making the signaling decision. + * Here is the reason for having this barrier: + * If the reading of the pend_sz (in this function) + * were to be reordered and read before we commit the new read + * index (in the calling function) we could + * have a problem. If the host were to set the pending_sz after we + * have sampled pending_sz and go to sleep before we commit the + * read index, we could miss sending the interrupt. Issue a full + * memory barrier to address this. + */ + virt_mb(); + + pending_sz = READ_ONCE(rbi->ring_buffer->pending_send_sz); + /* If the other end is not blocked on write don't bother. */ + if (pending_sz == 0) + return false; + + cur_write_sz = hv_get_bytes_to_write(rbi); + + if (cur_write_sz >= pending_sz) + return true; + + return false; +} + +/* + * An API to support in-place processing of incoming VMBUS packets. + */ +#define VMBUS_PKT_TRAILER 8 + +static inline struct vmpacket_descriptor * +get_next_pkt_raw(struct vmbus_channel *channel) +{ + struct hv_ring_buffer_info *ring_info = &channel->inbound; + u32 read_loc = ring_info->priv_read_index; + void *ring_buffer = hv_get_ring_buffer(ring_info); + struct vmpacket_descriptor *cur_desc; + u32 packetlen; + u32 dsize = ring_info->ring_datasize; + u32 delta = read_loc - ring_info->ring_buffer->read_index; + u32 bytes_avail_toread = (hv_get_bytes_to_read(ring_info) - delta); + + if (bytes_avail_toread < sizeof(struct vmpacket_descriptor)) + return NULL; + + if ((read_loc + sizeof(*cur_desc)) > dsize) + return NULL; + + cur_desc = ring_buffer + read_loc; + packetlen = cur_desc->len8 << 3; + + /* + * If the packet under consideration is wrapping around, + * return failure. + */ + if ((read_loc + packetlen + VMBUS_PKT_TRAILER) > (dsize - 1)) + return NULL; + + return cur_desc; +} + +/* + * A helper function to step through packets "in-place" + * This API is to be called after each successful call + * get_next_pkt_raw(). + */ +static inline void put_pkt_raw(struct vmbus_channel *channel, + struct vmpacket_descriptor *desc) +{ + struct hv_ring_buffer_info *ring_info = &channel->inbound; + u32 read_loc = ring_info->priv_read_index; + u32 packetlen = desc->len8 << 3; + u32 dsize = ring_info->ring_datasize; + + if ((read_loc + packetlen + VMBUS_PKT_TRAILER) > dsize) + BUG(); + /* + * Include the packet trailer. + */ + ring_info->priv_read_index += packetlen + VMBUS_PKT_TRAILER; +} + +/* + * This call commits the read index and potentially signals the host. + * Here is the pattern for using the "in-place" consumption APIs: + * + * while (get_next_pkt_raw() { + * process the packet "in-place"; + * put_pkt_raw(); + * } + * if (packets processed in place) + * commit_rd_index(); + */ +static inline void commit_rd_index(struct vmbus_channel *channel) +{ + struct hv_ring_buffer_info *ring_info = &channel->inbound; + /* + * Make sure all reads are done before we update the read index since + * the writer may start writing to the read area once the read index + * is updated. + */ + virt_rmb(); + ring_info->ring_buffer->read_index = ring_info->priv_read_index; + + if (hv_need_to_signal_on_read(ring_info)) + vmbus_set_event(channel); +} + + #endif /* _HYPERV_H */ diff --git a/include/linux/mcb.h b/include/linux/mcb.h index ed06e15a36aa..ead13d233a97 100644 --- a/include/linux/mcb.h +++ b/include/linux/mcb.h @@ -15,22 +15,30 @@ #include <linux/device.h> #include <linux/irqreturn.h> +#define CHAMELEON_FILENAME_LEN 12 + struct mcb_driver; struct mcb_device; /** * struct mcb_bus - MEN Chameleon Bus * - * @dev: pointer to carrier device - * @children: the child busses + * @dev: bus device + * @carrier: pointer to carrier device * @bus_nr: mcb bus number * @get_irq: callback to get IRQ number + * @revision: the FPGA's revision number + * @model: the FPGA's model number + * @filename: the FPGA's name */ struct mcb_bus { - struct list_head children; struct device dev; struct device *carrier; int bus_nr; + u8 revision; + char model; + u8 minor; + char name[CHAMELEON_FILENAME_LEN + 1]; int (*get_irq)(struct mcb_device *dev); }; #define to_mcb_bus(b) container_of((b), struct mcb_bus, dev) diff --git a/include/linux/nvmem-provider.h b/include/linux/nvmem-provider.h index a4fcc90b0f20..cd93416d762e 100644 --- a/include/linux/nvmem-provider.h +++ b/include/linux/nvmem-provider.h @@ -14,6 +14,10 @@ struct nvmem_device; struct nvmem_cell_info; +typedef int (*nvmem_reg_read_t)(void *priv, unsigned int offset, + void *val, size_t bytes); +typedef int (*nvmem_reg_write_t)(void *priv, unsigned int offset, + void *val, size_t bytes); struct nvmem_config { struct device *dev; @@ -24,6 +28,12 @@ struct nvmem_config { int ncells; bool read_only; bool root_only; + nvmem_reg_read_t reg_read; + nvmem_reg_write_t reg_write; + int size; + int word_size; + int stride; + void *priv; /* To be only used by old driver/misc/eeprom drivers */ bool compat; struct device *base_dev; diff --git a/include/linux/stm.h b/include/linux/stm.h index 1a79ed8e43da..8369d8a8cabd 100644 --- a/include/linux/stm.h +++ b/include/linux/stm.h @@ -50,6 +50,8 @@ struct stm_device; * @sw_end: last STP master available to software * @sw_nchannels: number of STP channels per master * @sw_mmiosz: size of one channel's IO space, for mmap, optional + * @hw_override: masters in the STP stream will not match the ones + * assigned by software, but are up to the STM hardware * @packet: callback that sends an STP packet * @mmio_addr: mmap callback, optional * @link: called when a new stm_source gets linked to us, optional @@ -85,6 +87,7 @@ struct stm_data { unsigned int sw_end; unsigned int sw_nchannels; unsigned int sw_mmiosz; + unsigned int hw_override; ssize_t (*packet)(struct stm_data *, unsigned int, unsigned int, unsigned int, unsigned int, unsigned int, diff --git a/include/uapi/linux/coresight-stm.h b/include/uapi/linux/coresight-stm.h new file mode 100644 index 000000000000..7e4272cf1fb2 --- /dev/null +++ b/include/uapi/linux/coresight-stm.h @@ -0,0 +1,21 @@ +#ifndef __UAPI_CORESIGHT_STM_H_ +#define __UAPI_CORESIGHT_STM_H_ + +#define STM_FLAG_TIMESTAMPED BIT(3) +#define STM_FLAG_GUARANTEED BIT(7) + +/* + * The CoreSight STM supports guaranteed and invariant timing + * transactions. Guaranteed transactions are guaranteed to be + * traced, this might involve stalling the bus or system to + * ensure the transaction is accepted by the STM. While invariant + * timing transactions are not guaranteed to be traced, they + * will take an invariant amount of time regardless of the + * state of the STM. + */ +enum { + STM_OPTION_GUARANTEED = 0, + STM_OPTION_INVARIANT, +}; + +#endif |