1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
|
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <sys/file.h>
#include "tools.h"
#include "model.h"
#include "error.h"
#include "kmem.h"
#include "pcilib.h"
#include "pci.h"
#include "datacpy.h"
typedef struct pcilib_software_register_bank_context_s pcilib_software_register_bank_context_t;
/**
* structure defining the context of software registers
*/
struct pcilib_software_register_bank_context_s {
pcilib_register_bank_context_t bank_ctx; /**< the bank context associated with the software registers */
pcilib_kmem_handle_t *kmem; /**< the kernel memory for software registers */
void *addr; /**< the virtual adress of the allocated kernel memory*/
};
void pcilib_software_registers_close(pcilib_t *ctx, pcilib_register_bank_context_t *bank_ctx) {
if (((pcilib_software_register_bank_context_t*)bank_ctx)->kmem)
pcilib_free_kernel_memory(ctx, ((pcilib_software_register_bank_context_t*)bank_ctx)->kmem, PCILIB_KMEM_FLAG_REUSE);
free(bank_ctx);
}
pcilib_register_bank_context_t* pcilib_software_registers_open(pcilib_t *ctx, pcilib_register_bank_t bank, const char* model, const void *args) {
int err;
pcilib_software_register_bank_context_t *bank_ctx;
pcilib_kmem_handle_t *handle;
pcilib_lock_t *lock;
pcilib_kmem_reuse_state_t reused;
const pcilib_register_bank_description_t *bank_desc = ctx->banks + bank;
if (bank_desc->size > PCILIB_KMEM_PAGE_SIZE) {
pcilib_error("Currently software register banks are limited to %lu bytes, but %lu requested", PCILIB_KMEM_PAGE_SIZE, bank_desc->size);
return NULL;
}
bank_ctx = calloc(1, sizeof(pcilib_software_register_bank_context_t));
if (!bank_ctx) {
pcilib_error("Memory allocation for bank context has failed");
return NULL;
}
/*we get a lock to protect the creation of the kernel space for software registers against multiple creations*/
lock = pcilib_get_lock(ctx, PCILIB_LOCK_FLAGS_DEFAULT, "softreg/%s", bank_desc->name);
if (!lock) {
pcilib_software_registers_close(ctx, (pcilib_register_bank_context_t*)bank_ctx);
pcilib_error("Failed to initialize a lock to protect bank %s with software registers", bank_desc->name);
return NULL;
}
err = pcilib_lock(lock);
if (err) {
pcilib_return_lock(ctx, PCILIB_LOCK_FLAGS_DEFAULT, lock);
pcilib_software_registers_close(ctx, (pcilib_register_bank_context_t*)bank_ctx);
pcilib_error("Error (%i) obtaining lock on bank %s with software registers", err, bank_desc->name);
return NULL;
}
/*creation of the kernel space*/
handle = pcilib_alloc_kernel_memory(ctx, PCILIB_KMEM_TYPE_PAGE, 1, PCILIB_KMEM_PAGE_SIZE, 0, PCILIB_KMEM_USE(PCILIB_KMEM_USE_SOFTWARE_REGISTERS, bank_desc->addr), PCILIB_KMEM_FLAG_REUSE|PCILIB_KMEM_FLAG_PERSISTENT);
if (!handle) {
pcilib_unlock(lock);
pcilib_return_lock(ctx, PCILIB_LOCK_FLAGS_DEFAULT, lock);
pcilib_software_registers_close(ctx, (pcilib_register_bank_context_t*)bank_ctx);
pcilib_error("Allocation of kernel memory for software registers has failed");
return NULL;
}
bank_ctx->kmem = handle;
bank_ctx->addr = pcilib_kmem_get_block_ua(ctx, handle, 0);
reused = pcilib_kmem_is_reused(ctx, handle);
if ((reused & PCILIB_KMEM_REUSE_REUSED) == 0) {
pcilib_register_t i;
if (reused & PCILIB_KMEM_REUSE_PARTIAL) {
pcilib_unlock(lock);
pcilib_return_lock(ctx, PCILIB_LOCK_FLAGS_DEFAULT, lock);
pcilib_software_registers_close(ctx, (pcilib_register_bank_context_t*)bank_ctx);
pcilib_error("Inconsistent software registers are found (only part of required buffers is available)");
return NULL;
}
/* here we fill the software registers with their default value*/
for (i = 0; ctx->model_info.registers[i].name != NULL; i++) {
if ((ctx->model_info.registers[i].bank == ctx->banks[bank].addr)&&(ctx->model_info.registers[i].type == PCILIB_REGISTER_STANDARD)) {
*(pcilib_register_value_t*)(bank_ctx->addr + ctx->model_info.registers[i].addr) = ctx->model_info.registers[i].defvalue;
}
}
}
pcilib_unlock(lock);
pcilib_return_lock(ctx, PCILIB_LOCK_FLAGS_DEFAULT, lock);
return (pcilib_register_bank_context_t*)bank_ctx;
}
uintptr_t pcilib_software_registers_resolve(pcilib_t *ctx, pcilib_register_bank_context_t *bank_ctx, pcilib_address_resolution_flags_t flags, pcilib_register_addr_t addr) {
if (addr == PCILIB_REGISTER_ADDRESS_INVALID) addr = 0;
switch (flags&PCILIB_ADDRESS_RESOLUTION_MASK_ADDRESS_TYPE) {
case 0:
return (uintptr_t)((pcilib_software_register_bank_context_t*)bank_ctx)->addr + addr;
case PCILIB_ADDRESS_RESOLUTION_FLAG_PHYS_ADDRESS:
return pcilib_kmem_get_block_pa(ctx, ((pcilib_software_register_bank_context_t*)bank_ctx)->kmem, 0) + addr;
}
return PCILIB_ADDRESS_INVALID;
}
int pcilib_software_registers_read(pcilib_t *ctx, pcilib_register_bank_context_t *bank_ctx, pcilib_register_addr_t addr, pcilib_register_value_t *value){
const pcilib_register_bank_description_t *b = bank_ctx->bank;
int access = b->access / 8;
pcilib_register_value_t val = 0;
if ((addr + sizeof(pcilib_register_value_t)) > bank_ctx->bank->size) {
pcilib_error("Trying to access space outside of the define register bank (bank: %s, addr: 0x%lx)", bank_ctx->bank->name, addr);
return PCILIB_ERROR_INVALID_ADDRESS;
}
pcilib_datacpy(&val, ((pcilib_software_register_bank_context_t*)bank_ctx)->addr + addr, access, 1, b->raw_endianess);
*value = val;
return 0;
}
int pcilib_software_registers_write(pcilib_t *ctx, pcilib_register_bank_context_t *bank_ctx, pcilib_register_addr_t addr, pcilib_register_value_t value) {
const pcilib_register_bank_description_t *b = bank_ctx->bank;
int access = b->access / 8;
if ((addr + sizeof(pcilib_register_value_t)) > bank_ctx->bank->size) {
pcilib_error("Trying to access space outside of the define register bank (bank: %s, addr: 0x%lx)", bank_ctx->bank->name, addr);
return PCILIB_ERROR_INVALID_ADDRESS;
}
// we consider this atomic operation and, therefore, do no locking
pcilib_datacpy(((pcilib_software_register_bank_context_t*)bank_ctx)->addr + addr, &value, access, 1, b->raw_endianess);
return 0;
}
|
