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Linux/arch/sparc/include/asm/ldc.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 #ifndef _SPARC64_LDC_H
  3 #define _SPARC64_LDC_H
  4 
  5 #include <asm/hypervisor.h>
  6 
  7 extern int ldom_domaining_enabled;
  8 void ldom_set_var(const char *var, const char *value);
  9 void ldom_reboot(const char *boot_command);
 10 void ldom_power_off(void);
 11 
 12 /* The event handler will be evoked when link state changes
 13  * or data becomes available on the receive side.
 14  *
 15  * For non-RAW links, if the LDC_EVENT_RESET event arrives the
 16  * driver should reset all of it's internal state and reinvoke
 17  * ldc_connect() to try and bring the link up again.
 18  *
 19  * For RAW links, ldc_connect() is not used.  Instead the driver
 20  * just waits for the LDC_EVENT_UP event.
 21  */
 22 struct ldc_channel_config {
 23         void (*event)(void *arg, int event);
 24 
 25         u32                     mtu;
 26         unsigned int            rx_irq;
 27         unsigned int            tx_irq;
 28         u8                      mode;
 29 #define LDC_MODE_RAW            0x00
 30 #define LDC_MODE_UNRELIABLE     0x01
 31 #define LDC_MODE_RESERVED       0x02
 32 #define LDC_MODE_STREAM         0x03
 33 
 34         u8                      debug;
 35 #define LDC_DEBUG_HS            0x01
 36 #define LDC_DEBUG_STATE         0x02
 37 #define LDC_DEBUG_RX            0x04
 38 #define LDC_DEBUG_TX            0x08
 39 #define LDC_DEBUG_DATA          0x10
 40 };
 41 
 42 #define LDC_EVENT_RESET         0x01
 43 #define LDC_EVENT_UP            0x02
 44 #define LDC_EVENT_DATA_READY    0x04
 45 
 46 #define LDC_STATE_INVALID       0x00
 47 #define LDC_STATE_INIT          0x01
 48 #define LDC_STATE_BOUND         0x02
 49 #define LDC_STATE_READY         0x03
 50 #define LDC_STATE_CONNECTED     0x04
 51 
 52 #define LDC_PACKET_SIZE         64
 53 
 54 struct ldc_channel;
 55 
 56 /* Allocate state for a channel.  */
 57 struct ldc_channel *ldc_alloc(unsigned long id,
 58                               const struct ldc_channel_config *cfgp,
 59                               void *event_arg,
 60                               const char *name);
 61 
 62 /* Shut down and free state for a channel.  */
 63 void ldc_free(struct ldc_channel *lp);
 64 
 65 /* Register TX and RX queues of the link with the hypervisor.  */
 66 int ldc_bind(struct ldc_channel *lp);
 67 void ldc_unbind(struct ldc_channel *lp);
 68 
 69 /* For non-RAW protocols we need to complete a handshake before
 70  * communication can proceed.  ldc_connect() does that, if the
 71  * handshake completes successfully, an LDC_EVENT_UP event will
 72  * be sent up to the driver.
 73  */
 74 int ldc_connect(struct ldc_channel *lp);
 75 int ldc_disconnect(struct ldc_channel *lp);
 76 
 77 int ldc_state(struct ldc_channel *lp);
 78 void ldc_set_state(struct ldc_channel *lp, u8 state);
 79 int ldc_mode(struct ldc_channel *lp);
 80 void __ldc_print(struct ldc_channel *lp, const char *caller);
 81 int ldc_rx_reset(struct ldc_channel *lp);
 82 
 83 #define ldc_print(chan) __ldc_print(chan, __func__)
 84 
 85 /* Read and write operations.  Only valid when the link is up.  */
 86 int ldc_write(struct ldc_channel *lp, const void *buf,
 87               unsigned int size);
 88 int ldc_read(struct ldc_channel *lp, void *buf, unsigned int size);
 89 
 90 #define LDC_MAP_SHADOW  0x01
 91 #define LDC_MAP_DIRECT  0x02
 92 #define LDC_MAP_IO      0x04
 93 #define LDC_MAP_R       0x08
 94 #define LDC_MAP_W       0x10
 95 #define LDC_MAP_X       0x20
 96 #define LDC_MAP_RW      (LDC_MAP_R | LDC_MAP_W)
 97 #define LDC_MAP_RWX     (LDC_MAP_R | LDC_MAP_W | LDC_MAP_X)
 98 #define LDC_MAP_ALL     0x03f
 99 
100 struct ldc_trans_cookie {
101         u64                     cookie_addr;
102         u64                     cookie_size;
103 };
104 
105 struct scatterlist;
106 int ldc_map_sg(struct ldc_channel *lp,
107                struct scatterlist *sg, int num_sg,
108                struct ldc_trans_cookie *cookies, int ncookies,
109                unsigned int map_perm);
110 
111 int ldc_map_single(struct ldc_channel *lp,
112                    void *buf, unsigned int len,
113                    struct ldc_trans_cookie *cookies, int ncookies,
114                    unsigned int map_perm);
115 
116 void ldc_unmap(struct ldc_channel *lp, struct ldc_trans_cookie *cookies,
117                int ncookies);
118 
119 int ldc_copy(struct ldc_channel *lp, int copy_dir,
120              void *buf, unsigned int len, unsigned long offset,
121              struct ldc_trans_cookie *cookies, int ncookies);
122 
123 static inline int ldc_get_dring_entry(struct ldc_channel *lp,
124                                       void *buf, unsigned int len,
125                                       unsigned long offset,
126                                       struct ldc_trans_cookie *cookies,
127                                       int ncookies)
128 {
129         return ldc_copy(lp, LDC_COPY_IN, buf, len, offset, cookies, ncookies);
130 }
131 
132 static inline int ldc_put_dring_entry(struct ldc_channel *lp,
133                                       void *buf, unsigned int len,
134                                       unsigned long offset,
135                                       struct ldc_trans_cookie *cookies,
136                                       int ncookies)
137 {
138         return ldc_copy(lp, LDC_COPY_OUT, buf, len, offset, cookies, ncookies);
139 }
140 
141 void *ldc_alloc_exp_dring(struct ldc_channel *lp, unsigned int len,
142                           struct ldc_trans_cookie *cookies,
143                           int *ncookies, unsigned int map_perm);
144 
145 void ldc_free_exp_dring(struct ldc_channel *lp, void *buf,
146                         unsigned int len,
147                         struct ldc_trans_cookie *cookies, int ncookies);
148 
149 #endif /* _SPARC64_LDC_H */
150 

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