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/*
* Copyright (c) 2019 Nutanix Inc. All rights reserved.
*
* Authors: Thanos Makatos <thanos@nutanix.com>
* Swapnil Ingle <swapnil.ingle@nutanix.com>
* Felipe Franciosi <felipe@nutanix.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* * Neither the name of Nutanix nor the names of its contributors may be
* used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL <COPYRIGHT HOLDER> BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
* DAMAGE.
*
*/
#include <Python.h>
#include "muser.h"
static PyObject *region_access_callbacks[LM_DEV_NUM_REGS];
static int
handle_read(char *dst, PyObject *result, int count)
{
int i;
PyArg_Parse(result, "i", &i);
Py_DECREF(result);
memcpy(dst, &i, count);
return 0;
}
/*
* Function callback called by libmuser. We then call the Python function.
*
* FIXME need a way to provide private pointer.
*/
static ssize_t
region_access_wrap(void *pvt, char *buf, size_t count, loff_t offset,
bool is_write, int region)
{
PyObject *arglist;
PyObject *result = NULL;
uint64_t _buf = { 0 };
if (region_access_callbacks[region] == NULL) {
fprintf(stderr, "FIXME no callback for region %d\n", region);
return -1;
}
if (is_write) {
memcpy(&_buf, buf, count);
}
/* FIXME not sure about type of count and offset */
arglist = Py_BuildValue("IKIKi", pvt, _buf, count, offset, is_write);
if (arglist == NULL) {
fprintf(stderr, "FIXME failed to build func args\n");
return -1;
}
result = PyEval_CallObject(region_access_callbacks[region], arglist);
Py_DECREF(arglist);
if (result == NULL) {
fprintf(stderr, "FIXME failed to call fn for region %d\n", region);
return -1;
}
if (!is_write) {
if (handle_read(buf, result, count)) {
return -1;
}
}
return count;
}
#define REGION_WRAP(region) \
static ssize_t \
r_##region##_wrap(void *p, char * const b, size_t c, loff_t o, \
const bool w) \
{ \
return region_access_wrap(p, b, c, o, w, region); \
}
REGION_WRAP(0)
REGION_WRAP(1)
REGION_WRAP(2)
REGION_WRAP(3)
REGION_WRAP(4)
REGION_WRAP(5)
REGION_WRAP(6)
REGION_WRAP(7)
REGION_WRAP(8)
static ssize_t (*region_access_wraps[LM_DEV_NUM_REGS])(void *, char *, size_t,
loff_t, bool) = {
r_0_wrap,
r_1_wrap,
r_2_wrap,
r_3_wrap,
r_4_wrap,
r_5_wrap,
r_6_wrap,
r_7_wrap,
r_8_wrap
};
struct _region_info {
char *perm;
unsigned int size;
PyObject *fn;
};
static const struct _region_info _0_ri;
static PyObject *log_fn;
static lm_log_lvl_t log_lvl = LM_ERR;
static void
_log_fn(void *pvt, const char *msg)
{
PyObject *arglist;
PyObject *result = NULL;
arglist = Py_BuildValue("(s)", msg);
result = PyEval_CallObject(log_fn, arglist);
Py_DECREF(arglist);
if (result != NULL) {
Py_DECREF(result);
}
}
static PyObject *
libmuser_run(PyObject *self, PyObject *args, PyObject *kwargs)
{
static char *kwlist[] = {"vid", "did", "uuid", "log", "log_lvl",
"bar0", "bar1", "bar2", "bar3", "bar4", "bar5", "rom", "cfg", "vga",
"intx", "msi", "msix", "err", "req",
NULL};
int err;
lm_dev_info_t dev_info = { 0 };
int i;
struct _region_info _ri[LM_DEV_NUM_REGS] = { 0 };
if (!PyArg_ParseTupleAndKeywords(
args,
kwargs,
"HHs|Oi(sIO)(sIO)(sIO)(sIO)(sIO)(sIO)(sIO)(sIO)(sIO)IIIII",
kwlist,
&dev_info.pci_info.id.vid,
&dev_info.pci_info.id.did,
&dev_info.uuid,
&log_fn,
&log_lvl,
&_ri[0].perm, &_ri[0].size, &_ri[0].fn,
&_ri[1].perm, &_ri[1].size, &_ri[1].fn,
&_ri[2].perm, &_ri[2].size, &_ri[2].fn,
&_ri[3].perm, &_ri[3].size, &_ri[3].fn,
&_ri[4].perm, &_ri[4].size, &_ri[4].fn,
&_ri[5].perm, &_ri[5].size, &_ri[5].fn,
&_ri[6].perm, &_ri[6].size, &_ri[6].fn,
&_ri[7].perm, &_ri[7].size, &_ri[7].fn,
&_ri[8].perm, &_ri[8].size, &_ri[8].fn,
&dev_info.pci_info.irq_count[0],
&dev_info.pci_info.irq_count[1],
&dev_info.pci_info.irq_count[2],
&dev_info.pci_info.irq_count[3],
&dev_info.pci_info.irq_count[4])) {
return NULL;
}
for (i = 0; i < LM_DEV_NUM_REGS; i++) {
int j;
uint32_t flags = 0;
if (i == LM_DEV_CFG_REG_IDX && !memcmp(&_0_ri, &_ri[i], sizeof _0_ri)) {
continue;
}
if (_ri[i].perm != NULL) {
for (j = 0; j < strlen(_ri[i].perm); j++) {
if (_ri[i].perm[j] == 'r') {
flags |= LM_REG_FLAG_READ;
} else if (_ri[i].perm[j] == 'w') {
flags |= LM_REG_FLAG_WRITE;
} else {
/* FIXME shouldn't print to stderr */
fprintf(stderr, "bad permission '%c'\n", _ri[i].perm[j]);
return NULL;
}
}
}
region_access_callbacks[i] = _ri[i].fn;
dev_info.pci_info.reg_info[i].flags = flags;
dev_info.pci_info.reg_info[i].size = _ri[i].size;
dev_info.pci_info.reg_info[i].fn = region_access_wraps[i];
}
if (log_fn != NULL) {
if (!PyCallable_Check(log_fn)) {
return NULL;
}
dev_info.log = _log_fn;
dev_info.log_lvl = log_lvl;
}
err = lm_ctx_run(&dev_info);
return Py_BuildValue("i", err);
}
static PyMethodDef LibmuserMethods[] = {
{ "run",
(PyCFunction)libmuser_run,
METH_VARARGS | METH_KEYWORDS,
"runs a device"
},
{ NULL, NULL, 0, NULL }
};
PyMODINIT_FUNC
initmuser(void)
{
(void)Py_InitModule("muser", LibmuserMethods);
}
/* ex: set tabstop=4 shiftwidth=4 softtabstop=4 expandtab: */
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