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/* Copyright (C) 2011 The Android Open Source Project
**
** This software is licensed under the terms of the GNU General Public
** License version 2, as published by the Free Software Foundation, and
** may be copied, distributed, and modified under those terms.
**
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
** GNU General Public License for more details.
*/
#include "android/utils/panic.h"
#include "android/utils/system.h"
#include "hw/goldfish_pipe.h"
#include "hw/goldfish_device.h"
#include "qemu-timer.h"
#ifdef CONFIG_KVM
#include "kvm.h"
#endif
#define DEBUG 0
/* Set to 1 to debug i/o register reads/writes */
#define DEBUG_REGS 0
#if DEBUG >= 1
# define D(...) fprintf(stderr, __VA_ARGS__), fprintf(stderr, "\n")
#else
# define D(...) (void)0
#endif
#if DEBUG >= 2
# define DD(...) fprintf(stderr, __VA_ARGS__), fprintf(stderr, "\n")
#else
# define DD(...) (void)0
#endif
#if DEBUG_REGS >= 1
# define DR(...) D(__VA_ARGS__)
#else
# define DR(...) (void)0
#endif
#define E(...) fprintf(stderr, "ERROR:" __VA_ARGS__), fprintf(stderr, "\n")
/* Set to 1 to enable the 'zero' pipe type, useful for debugging */
#define DEBUG_ZERO_PIPE 1
/* Set to 1 to enable the 'pingpong' pipe type, useful for debugging */
#define DEBUG_PINGPONG_PIPE 1
/* Set to 1 to enable the 'throttle' pipe type, useful for debugging */
#define DEBUG_THROTTLE_PIPE 1
/* Maximum length of pipe service name, in characters (excluding final 0) */
#define MAX_PIPE_SERVICE_NAME_SIZE 255
#define GOLDFISH_PIPE_SAVE_VERSION 1
/***********************************************************************
***********************************************************************
*****
***** P I P E S E R V I C E R E G I S T R A T I O N
*****
*****/
#define MAX_PIPE_SERVICES 8
typedef struct {
const char* name;
void* opaque;
GoldfishPipeFuncs funcs;
} PipeService;
typedef struct {
int count;
PipeService services[MAX_PIPE_SERVICES];
} PipeServices;
static PipeServices _pipeServices[1];
void
goldfish_pipe_add_type(const char* pipeName,
void* pipeOpaque,
const GoldfishPipeFuncs* pipeFuncs )
{
PipeServices* list = _pipeServices;
int count = list->count;
if (count >= MAX_PIPE_SERVICES) {
APANIC("Too many goldfish pipe services (%d)", count);
}
if (strlen(pipeName) > MAX_PIPE_SERVICE_NAME_SIZE) {
APANIC("Pipe service name too long: '%s'", pipeName);
}
list->services[count].name = pipeName;
list->services[count].opaque = pipeOpaque;
list->services[count].funcs = pipeFuncs[0];
list->count++;
}
static const PipeService*
goldfish_pipe_find_type(const char* pipeName)
{
PipeServices* list = _pipeServices;
int count = list->count;
int nn;
for (nn = 0; nn < count; nn++) {
if (!strcmp(list->services[nn].name, pipeName)) {
return &list->services[nn];
}
}
return NULL;
}
/***********************************************************************
***********************************************************************
*****
***** P I P E C O N N E C T I O N S
*****
*****/
typedef struct PipeDevice PipeDevice;
typedef struct Pipe {
struct Pipe* next;
struct Pipe* next_waked;
PipeDevice* device;
uint32_t channel;
void* opaque;
const GoldfishPipeFuncs* funcs;
const PipeService* service;
char* args;
unsigned char wanted;
char closed;
} Pipe;
/* Forward */
static void* pipeConnector_new(Pipe* pipe);
static Pipe*
pipe_new0(PipeDevice* dev)
{
Pipe* pipe;
ANEW0(pipe);
pipe->device = dev;
return pipe;
}
static Pipe*
pipe_new(uint32_t channel, PipeDevice* dev)
{
Pipe* pipe = pipe_new0(dev);
pipe->channel = channel;
pipe->opaque = pipeConnector_new(pipe);
return pipe;
}
static Pipe**
pipe_list_findp_channel( Pipe** list, uint32_t channel )
{
Pipe** pnode = list;
for (;;) {
Pipe* node = *pnode;
if (node == NULL || node->channel == channel) {
break;
}
pnode = &node->next;
}
return pnode;
}
#if 0
static Pipe**
pipe_list_findp_opaque( Pipe** list, void* opaque )
{
Pipe** pnode = list;
for (;;) {
Pipe* node = *pnode;
if (node == NULL || node->opaque == opaque) {
break;
}
pnode = &node->next;
}
return pnode;
}
#endif
static Pipe**
pipe_list_findp_waked( Pipe** list, Pipe* pipe )
{
Pipe** pnode = list;
for (;;) {
Pipe* node = *pnode;
if (node == NULL || node == pipe) {
break;
}
pnode = &node->next_waked;
}
return pnode;
}
static void
pipe_list_remove_waked( Pipe** list, Pipe* pipe )
{
Pipe** lookup = pipe_list_findp_waked(list, pipe);
Pipe* node = *lookup;
if (node != NULL) {
(*lookup) = node->next_waked;
node->next_waked = NULL;
}
}
static void
pipe_save( Pipe* pipe, QEMUFile* file )
{
if (pipe->service == NULL) {
/* pipe->service == NULL means we're still using a PipeConnector */
/* Write a zero to indicate this condition */
qemu_put_byte(file, 0);
} else {
/* Otherwise, write a '1' then the service name */
qemu_put_byte(file, 1);
qemu_put_string(file, pipe->service->name);
}
/* Now save other common data */
qemu_put_be32(file, (unsigned int)pipe->channel);
qemu_put_byte(file, (int)pipe->wanted);
qemu_put_byte(file, (int)pipe->closed);
/* Write 1 + args, if any, or simply 0 otherwise */
if (pipe->args != NULL) {
qemu_put_byte(file, 1);
qemu_put_string(file, pipe->args);
} else {
qemu_put_byte(file, 0);
}
if (pipe->funcs->save) {
pipe->funcs->save(pipe->opaque, file);
}
}
static Pipe*
pipe_load( PipeDevice* dev, QEMUFile* file )
{
Pipe* pipe;
const PipeService* service = NULL;
int state = qemu_get_byte(file);
uint32_t channel;
if (state != 0) {
/* Pipe is associated with a service. */
char* name = qemu_get_string(file);
if (name == NULL)
return NULL;
service = goldfish_pipe_find_type(name);
if (service == NULL) {
D("No QEMU pipe service named '%s'", name);
AFREE(name);
return NULL;
}
}
channel = qemu_get_be32(file);
pipe = pipe_new(channel, dev);
pipe->wanted = qemu_get_byte(file);
pipe->closed = qemu_get_byte(file);
if (qemu_get_byte(file) != 0) {
pipe->args = qemu_get_string(file);
}
pipe->service = service;
if (service != NULL) {
pipe->funcs = &service->funcs;
}
if (pipe->funcs->load) {
pipe->opaque = pipe->funcs->load(pipe, service ? service->opaque : NULL, pipe->args, file);
if (pipe->opaque == NULL) {
AFREE(pipe);
return NULL;
}
} else {
/* Force-close the pipe on load */
pipe->closed = 1;
}
return pipe;
}
static void
pipe_free( Pipe* pipe )
{
/* Call close callback */
if (pipe->funcs->close) {
pipe->funcs->close(pipe->opaque);
}
/* Free stuff */
AFREE(pipe->args);
AFREE(pipe);
}
/***********************************************************************
***********************************************************************
*****
***** P I P E C O N N E C T O R S
*****
*****/
/* These are used to handle the initial connection attempt, where the
* client is going to write the name of the pipe service it wants to
* connect to, followed by a terminating zero.
*/
typedef struct {
Pipe* pipe;
char buffer[128];
int buffpos;
} PipeConnector;
static const GoldfishPipeFuncs pipeConnector_funcs; // forward
void*
pipeConnector_new(Pipe* pipe)
{
PipeConnector* pcon;
ANEW0(pcon);
pcon->pipe = pipe;
pipe->funcs = &pipeConnector_funcs;
return pcon;
}
static void
pipeConnector_close( void* opaque )
{
PipeConnector* pcon = opaque;
AFREE(pcon);
}
static int
pipeConnector_sendBuffers( void* opaque, const GoldfishPipeBuffer* buffers, int numBuffers )
{
PipeConnector* pcon = opaque;
const GoldfishPipeBuffer* buffers_limit = buffers + numBuffers;
int ret = 0;
DD("%s: channel=0x%x numBuffers=%d", __FUNCTION__,
pcon->pipe->channel,
numBuffers);
while (buffers < buffers_limit) {
int avail;
DD("%s: buffer data (%3d bytes): '%.*s'", __FUNCTION__,
buffers[0].size, buffers[0].size, buffers[0].data);
if (buffers[0].size == 0) {
buffers++;
continue;
}
avail = sizeof(pcon->buffer) - pcon->buffpos;
if (avail > buffers[0].size)
avail = buffers[0].size;
if (avail > 0) {
memcpy(pcon->buffer + pcon->buffpos, buffers[0].data, avail);
pcon->buffpos += avail;
ret += avail;
}
buffers++;
}
/* Now check that our buffer contains a zero-terminated string */
if (memchr(pcon->buffer, '\0', pcon->buffpos) != NULL) {
/* Acceptable formats for the connection string are:
*
* pipe:<name>
* pipe:<name>:<arguments>
*/
char* pipeName;
char* pipeArgs;
D("%s: connector: '%s'", __FUNCTION__, pcon->buffer);
if (memcmp(pcon->buffer, "pipe:", 5) != 0) {
/* Nope, we don't handle these for now. */
D("%s: Unknown pipe connection: '%s'", __FUNCTION__, pcon->buffer);
return PIPE_ERROR_INVAL;
}
pipeName = pcon->buffer + 5;
pipeArgs = strchr(pipeName, ':');
if (pipeArgs != NULL) {
*pipeArgs++ = '\0';
if (!*pipeArgs)
pipeArgs = NULL;
}
Pipe* pipe = pcon->pipe;
const PipeService* svc = goldfish_pipe_find_type(pipeName);
if (svc == NULL) {
D("%s: Unknown server!", __FUNCTION__);
return PIPE_ERROR_INVAL;
}
void* peer = svc->funcs.init(pipe, svc->opaque, pipeArgs);
if (peer == NULL) {
D("%s: Initialization failed!", __FUNCTION__);
return PIPE_ERROR_INVAL;
}
/* Do the evil switch now */
pipe->opaque = peer;
pipe->service = svc;
pipe->funcs = &svc->funcs;
pipe->args = ASTRDUP(pipeArgs);
AFREE(pcon);
}
return ret;
}
static int
pipeConnector_recvBuffers( void* opaque, GoldfishPipeBuffer* buffers, int numBuffers )
{
return PIPE_ERROR_IO;
}
static unsigned
pipeConnector_poll( void* opaque )
{
return PIPE_POLL_OUT;
}
static void
pipeConnector_wakeOn( void* opaque, int flags )
{
/* nothing, really should never happen */
}
static void
pipeConnector_save( void* pipe, QEMUFile* file )
{
PipeConnector* pcon = pipe;
qemu_put_sbe32(file, pcon->buffpos);
qemu_put_sbuffer(file, (const int8_t*)pcon->buffer, pcon->buffpos);
}
static void*
pipeConnector_load( void* hwpipe, void* pipeOpaque, const char* args, QEMUFile* file )
{
PipeConnector* pcon;
int len = qemu_get_sbe32(file);
if (len < 0 || len > sizeof(pcon->buffer)) {
return NULL;
}
pcon = pipeConnector_new(hwpipe);
pcon->buffpos = len;
if (qemu_get_buffer(file, (uint8_t*)pcon->buffer, pcon->buffpos) != pcon->buffpos) {
AFREE(pcon);
return NULL;
}
return pcon;
}
static const GoldfishPipeFuncs pipeConnector_funcs = {
NULL, /* init */
pipeConnector_close, /* should rarely happen */
pipeConnector_sendBuffers, /* the interesting stuff */
pipeConnector_recvBuffers, /* should not happen */
pipeConnector_poll, /* should not happen */
pipeConnector_wakeOn, /* should not happen */
pipeConnector_save,
pipeConnector_load,
};
/***********************************************************************
***********************************************************************
*****
***** Z E R O P I P E S
*****
*****/
/* A simple pipe service that mimics /dev/zero, you can write anything to
* it, and you can always read any number of zeros from it. Useful for debugging
* the kernel driver.
*/
#if DEBUG_ZERO_PIPE
typedef struct {
void* hwpipe;
} ZeroPipe;
static void*
zeroPipe_init( void* hwpipe, void* svcOpaque, const char* args )
{
ZeroPipe* zpipe;
D("%s: hwpipe=%p", __FUNCTION__, hwpipe);
ANEW0(zpipe);
zpipe->hwpipe = hwpipe;
return zpipe;
}
static void
zeroPipe_close( void* opaque )
{
ZeroPipe* zpipe = opaque;
D("%s: hwpipe=%p", __FUNCTION__, zpipe->hwpipe);
AFREE(zpipe);
}
static int
zeroPipe_sendBuffers( void* opaque, const GoldfishPipeBuffer* buffers, int numBuffers )
{
int ret = 0;
while (numBuffers > 0) {
ret += buffers[0].size;
buffers++;
numBuffers--;
}
return ret;
}
static int
zeroPipe_recvBuffers( void* opaque, GoldfishPipeBuffer* buffers, int numBuffers )
{
int ret = 0;
while (numBuffers > 0) {
ret += buffers[0].size;
memset(buffers[0].data, 0, buffers[0].size);
buffers++;
numBuffers--;
}
return ret;
}
static unsigned
zeroPipe_poll( void* opaque )
{
return PIPE_POLL_IN | PIPE_POLL_OUT;
}
static void
zeroPipe_wakeOn( void* opaque, int flags )
{
/* nothing to do here */
}
static const GoldfishPipeFuncs zeroPipe_funcs = {
zeroPipe_init,
zeroPipe_close,
zeroPipe_sendBuffers,
zeroPipe_recvBuffers,
zeroPipe_poll,
zeroPipe_wakeOn,
};
#endif /* DEBUG_ZERO */
/***********************************************************************
***********************************************************************
*****
***** P I N G P O N G P I P E S
*****
*****/
/* Similar debug service that sends back anything it receives */
/* All data is kept in a circular dynamic buffer */
#if DEBUG_PINGPONG_PIPE
/* Initial buffer size */
#define PINGPONG_SIZE 1024
typedef struct {
void* hwpipe;
uint8_t* buffer;
size_t size;
size_t pos;
size_t count;
unsigned flags;
} PingPongPipe;
static void
pingPongPipe_init0( PingPongPipe* pipe, void* hwpipe, void* svcOpaque )
{
pipe->hwpipe = hwpipe;
pipe->size = PINGPONG_SIZE;
pipe->buffer = malloc(pipe->size);
pipe->pos = 0;
pipe->count = 0;
}
static void*
pingPongPipe_init( void* hwpipe, void* svcOpaque, const char* args )
{
PingPongPipe* ppipe;
D("%s: hwpipe=%p", __FUNCTION__, hwpipe);
ANEW0(ppipe);
pingPongPipe_init0(ppipe, hwpipe, svcOpaque);
return ppipe;
}
static void
pingPongPipe_close( void* opaque )
{
PingPongPipe* ppipe = opaque;
D("%s: hwpipe=%p (pos=%d count=%d size=%d)", __FUNCTION__,
ppipe->hwpipe, ppipe->pos, ppipe->count, ppipe->size);
free(ppipe->buffer);
AFREE(ppipe);
}
static int
pingPongPipe_sendBuffers( void* opaque, const GoldfishPipeBuffer* buffers, int numBuffers )
{
PingPongPipe* pipe = opaque;
int ret = 0;
int count;
const GoldfishPipeBuffer* buff = buffers;
const GoldfishPipeBuffer* buffEnd = buff + numBuffers;
count = 0;
for ( ; buff < buffEnd; buff++ )
count += buff->size;
/* Do we need to grow the pingpong buffer? */
while (count > pipe->size - pipe->count) {
size_t newsize = pipe->size*2;
uint8_t* newbuff = realloc(pipe->buffer, newsize);
int wpos = pipe->pos + pipe->count;
if (newbuff == NULL) {
break;
}
if (wpos > pipe->size) {
wpos -= pipe->size;
memcpy(newbuff + pipe->size, newbuff, wpos);
}
pipe->buffer = newbuff;
pipe->size = newsize;
D("pingpong buffer is now %d bytes", newsize);
}
for ( buff = buffers; buff < buffEnd; buff++ ) {
int avail = pipe->size - pipe->count;
if (avail <= 0) {
if (ret == 0)
ret = PIPE_ERROR_AGAIN;
break;
}
if (avail > buff->size) {
avail = buff->size;
}
int wpos = pipe->pos + pipe->count;
if (wpos >= pipe->size) {
wpos -= pipe->size;
}
if (wpos + avail <= pipe->size) {
memcpy(pipe->buffer + wpos, buff->data, avail);
} else {
int avail2 = pipe->size - wpos;
memcpy(pipe->buffer + wpos, buff->data, avail2);
memcpy(pipe->buffer, buff->data + avail2, avail - avail2);
}
pipe->count += avail;
ret += avail;
}
/* Wake up any waiting readers if we wrote something */
if (pipe->count > 0 && (pipe->flags & PIPE_WAKE_READ)) {
goldfish_pipe_wake(pipe->hwpipe, PIPE_WAKE_READ);
}
return ret;
}
static int
pingPongPipe_recvBuffers( void* opaque, GoldfishPipeBuffer* buffers, int numBuffers )
{
PingPongPipe* pipe = opaque;
int ret = 0;
while (numBuffers > 0) {
int avail = pipe->count;
if (avail <= 0) {
if (ret == 0)
ret = PIPE_ERROR_AGAIN;
break;
}
if (avail > buffers[0].size) {
avail = buffers[0].size;
}
int rpos = pipe->pos;
if (rpos + avail <= pipe->size) {
memcpy(buffers[0].data, pipe->buffer + rpos, avail);
} else {
int avail2 = pipe->size - rpos;
memcpy(buffers[0].data, pipe->buffer + rpos, avail2);
memcpy(buffers[0].data + avail2, pipe->buffer, avail - avail2);
}
pipe->count -= avail;
pipe->pos += avail;
if (pipe->pos >= pipe->size) {
pipe->pos -= pipe->size;
}
ret += avail;
numBuffers--;
buffers++;
}
/* Wake up any waiting readers if we wrote something */
if (pipe->count < PINGPONG_SIZE && (pipe->flags & PIPE_WAKE_WRITE)) {
goldfish_pipe_wake(pipe->hwpipe, PIPE_WAKE_WRITE);
}
return ret;
}
static unsigned
pingPongPipe_poll( void* opaque )
{
PingPongPipe* pipe = opaque;
unsigned ret = 0;
if (pipe->count < pipe->size)
ret |= PIPE_POLL_OUT;
if (pipe->count > 0)
ret |= PIPE_POLL_IN;
return ret;
}
static void
pingPongPipe_wakeOn( void* opaque, int flags )
{
PingPongPipe* pipe = opaque;
pipe->flags |= (unsigned)flags;
}
static const GoldfishPipeFuncs pingPongPipe_funcs = {
pingPongPipe_init,
pingPongPipe_close,
pingPongPipe_sendBuffers,
pingPongPipe_recvBuffers,
pingPongPipe_poll,
pingPongPipe_wakeOn,
};
#endif /* DEBUG_PINGPONG_PIPE */
/***********************************************************************
***********************************************************************
*****
***** T H R O T T L E P I P E S
*****
*****/
/* Similar to PingPongPipe, but will throttle the bandwidth to test
* blocking I/O.
*/
#ifdef DEBUG_THROTTLE_PIPE
typedef struct {
PingPongPipe pingpong;
double sendRate;
int64_t sendExpiration;
double recvRate;
int64_t recvExpiration;
QEMUTimer* timer;
} ThrottlePipe;
/* forward declaration */
static void throttlePipe_timerFunc( void* opaque );
static void*
throttlePipe_init( void* hwpipe, void* svcOpaque, const char* args )
{
ThrottlePipe* pipe;
ANEW0(pipe);
pingPongPipe_init0(&pipe->pingpong, hwpipe, svcOpaque);
pipe->timer = qemu_new_timer_ns(vm_clock, throttlePipe_timerFunc, pipe);
/* For now, limit to 500 KB/s in both directions */
pipe->sendRate = 1e9 / (500*1024*8);
pipe->recvRate = pipe->sendRate;
return pipe;
}
static void
throttlePipe_close( void* opaque )
{
ThrottlePipe* pipe = opaque;
qemu_del_timer(pipe->timer);
qemu_free_timer(pipe->timer);
pingPongPipe_close(&pipe->pingpong);
}
static void
throttlePipe_rearm( ThrottlePipe* pipe )
{
int64_t minExpiration = 0;
DD("%s: sendExpiration=%lld recvExpiration=%lld\n", __FUNCTION__, pipe->sendExpiration, pipe->recvExpiration);
if (pipe->sendExpiration) {
if (minExpiration == 0 || pipe->sendExpiration < minExpiration)
minExpiration = pipe->sendExpiration;
}
if (pipe->recvExpiration) {
if (minExpiration == 0 || pipe->recvExpiration < minExpiration)
minExpiration = pipe->recvExpiration;
}
if (minExpiration != 0) {
DD("%s: Arming for %lld\n", __FUNCTION__, minExpiration);
qemu_mod_timer(pipe->timer, minExpiration);
}
}
static void
throttlePipe_timerFunc( void* opaque )
{
ThrottlePipe* pipe = opaque;
int64_t now = qemu_get_clock_ns(vm_clock);
DD("%s: TICK! now=%lld sendExpiration=%lld recvExpiration=%lld\n",
__FUNCTION__, now, pipe->sendExpiration, pipe->recvExpiration);
/* Timer has expired, signal wake up if needed */
int flags = 0;
if (pipe->sendExpiration && now > pipe->sendExpiration) {
flags |= PIPE_WAKE_WRITE;
pipe->sendExpiration = 0;
}
if (pipe->recvExpiration && now > pipe->recvExpiration) {
flags |= PIPE_WAKE_READ;
pipe->recvExpiration = 0;
}
flags &= pipe->pingpong.flags;
if (flags != 0) {
DD("%s: WAKE %d\n", __FUNCTION__, flags);
goldfish_pipe_wake(pipe->pingpong.hwpipe, flags);
}
throttlePipe_rearm(pipe);
}
static int
throttlePipe_sendBuffers( void* opaque, const GoldfishPipeBuffer* buffers, int numBuffers )
{
ThrottlePipe* pipe = opaque;
int ret;
if (pipe->sendExpiration > 0) {
return PIPE_ERROR_AGAIN;
}
ret = pingPongPipe_sendBuffers(&pipe->pingpong, buffers, numBuffers);
if (ret > 0) {
/* Compute next send expiration time */
pipe->sendExpiration = qemu_get_clock_ns(vm_clock) + ret*pipe->sendRate;
throttlePipe_rearm(pipe);
}
return ret;
}
static int
throttlePipe_recvBuffers( void* opaque, GoldfishPipeBuffer* buffers, int numBuffers )
{
ThrottlePipe* pipe = opaque;
int ret;
if (pipe->recvExpiration > 0) {
return PIPE_ERROR_AGAIN;
}
ret = pingPongPipe_recvBuffers(&pipe->pingpong, buffers, numBuffers);
if (ret > 0) {
pipe->recvExpiration = qemu_get_clock_ns(vm_clock) + ret*pipe->recvRate;
throttlePipe_rearm(pipe);
}
return ret;
}
static unsigned
throttlePipe_poll( void* opaque )
{
ThrottlePipe* pipe = opaque;
unsigned ret = pingPongPipe_poll(&pipe->pingpong);
if (pipe->sendExpiration > 0)
ret &= ~PIPE_POLL_OUT;
if (pipe->recvExpiration > 0)
ret &= ~PIPE_POLL_IN;
return ret;
}
static void
throttlePipe_wakeOn( void* opaque, int flags )
{
ThrottlePipe* pipe = opaque;
pingPongPipe_wakeOn(&pipe->pingpong, flags);
}
static const GoldfishPipeFuncs throttlePipe_funcs = {
throttlePipe_init,
throttlePipe_close,
throttlePipe_sendBuffers,
throttlePipe_recvBuffers,
throttlePipe_poll,
throttlePipe_wakeOn,
};
#endif /* DEBUG_THROTTLE_PIPE */
/***********************************************************************
***********************************************************************
*****
***** G O L D F I S H P I P E D E V I C E
*****
*****/
struct PipeDevice {
struct goldfish_device dev;
/* the list of all pipes */
Pipe* pipes;
/* the list of signalled pipes */
Pipe* signaled_pipes;
/* i/o registers */
uint32_t address;
uint32_t size;
uint32_t status;
uint32_t channel;
uint32_t wakes;
};
static void
pipeDevice_doCommand( PipeDevice* dev, uint32_t command )
{
Pipe** lookup = pipe_list_findp_channel(&dev->pipes, dev->channel);
Pipe* pipe = *lookup;
CPUState* env = cpu_single_env;
/* Check that we're referring a known pipe channel */
if (command != PIPE_CMD_OPEN && pipe == NULL) {
dev->status = PIPE_ERROR_INVAL;
return;
}
/* If the pipe is closed by the host, return an error */
if (pipe != NULL && pipe->closed && command != PIPE_CMD_CLOSE) {
dev->status = PIPE_ERROR_IO;
return;
}
switch (command) {
case PIPE_CMD_OPEN:
DD("%s: CMD_OPEN channel=0x%x", __FUNCTION__, dev->channel);
if (pipe != NULL) {
dev->status = PIPE_ERROR_INVAL;
break;
}
pipe = pipe_new(dev->channel, dev);
pipe->next = dev->pipes;
dev->pipes = pipe;
dev->status = 0;
break;
case PIPE_CMD_CLOSE:
DD("%s: CMD_CLOSE channel=0x%x", __FUNCTION__, dev->channel);
/* Remove from device's lists */
*lookup = pipe->next;
pipe->next = NULL;
pipe_list_remove_waked(&dev->signaled_pipes, pipe);
pipe_free(pipe);
break;
case PIPE_CMD_POLL:
dev->status = pipe->funcs->poll(pipe->opaque);
DD("%s: CMD_POLL > status=%d", __FUNCTION__, dev->status);
break;
case PIPE_CMD_READ_BUFFER: {
/* Translate virtual address into physical one, into emulator memory. */
GoldfishPipeBuffer buffer;
uint32_t address = dev->address;
uint32_t page = address & TARGET_PAGE_MASK;
target_phys_addr_t phys;
#ifdef CONFIG_KVM
if(kvm_enabled()) {
cpu_synchronize_state(env, 0);
}
#endif
phys = cpu_get_phys_page_debug(env, page);
buffer.data = qemu_get_ram_ptr(phys) + (address - page);
buffer.size = dev->size;
dev->status = pipe->funcs->recvBuffers(pipe->opaque, &buffer, 1);
DD("%s: CMD_READ_BUFFER channel=0x%x address=0x%08x size=%d > status=%d",
__FUNCTION__, dev->channel, dev->address, dev->size, dev->status);
break;
}
case PIPE_CMD_WRITE_BUFFER: {
/* Translate virtual address into physical one, into emulator memory. */
GoldfishPipeBuffer buffer;
uint32_t address = dev->address;
uint32_t page = address & TARGET_PAGE_MASK;
target_phys_addr_t phys;
#ifdef CONFIG_KVM
if(kvm_enabled()) {
cpu_synchronize_state(env, 0);
}
#endif
phys = cpu_get_phys_page_debug(env, page);
buffer.data = qemu_get_ram_ptr(phys) + (address - page);
buffer.size = dev->size;
dev->status = pipe->funcs->sendBuffers(pipe->opaque, &buffer, 1);
DD("%s: CMD_WRITE_BUFFER channel=0x%x address=0x%08x size=%d > status=%d",
__FUNCTION__, dev->channel, dev->address, dev->size, dev->status);
break;
}
case PIPE_CMD_WAKE_ON_READ:
DD("%s: CMD_WAKE_ON_READ channel=0x%x", __FUNCTION__, dev->channel);
if ((pipe->wanted & PIPE_WAKE_READ) == 0) {
pipe->wanted |= PIPE_WAKE_READ;
pipe->funcs->wakeOn(pipe->opaque, pipe->wanted);
}
dev->status = 0;
break;
case PIPE_CMD_WAKE_ON_WRITE:
DD("%s: CMD_WAKE_ON_WRITE channel=0x%x", __FUNCTION__, dev->channel);
if ((pipe->wanted & PIPE_WAKE_WRITE) == 0) {
pipe->wanted |= PIPE_WAKE_WRITE;
pipe->funcs->wakeOn(pipe->opaque, pipe->wanted);
}
dev->status = 0;
break;
default:
D("%s: command=%d (0x%x)\n", __FUNCTION__, command, command);
}
}
static void pipe_dev_write(void *opaque, target_phys_addr_t offset, uint32_t value)
{
PipeDevice *s = (PipeDevice *)opaque;
switch (offset) {
case PIPE_REG_COMMAND:
DR("%s: command=%d (0x%x)", __FUNCTION__, value, value);
pipeDevice_doCommand(s, value);
break;
case PIPE_REG_SIZE:
DR("%s: size=%d (0x%x)", __FUNCTION__, value, value);
s->size = value;
break;
case PIPE_REG_ADDRESS:
DR("%s: address=%d (0x%x)", __FUNCTION__, value, value);
s->address = value;
break;
case PIPE_REG_CHANNEL:
DR("%s: channel=%d (0x%x)", __FUNCTION__, value, value);
s->channel = value;
break;
default:
D("%s: offset=%d (0x%x) value=%d (0x%x)\n", __FUNCTION__, offset,
offset, value, value);
break;
}
}
/* I/O read */
static uint32_t pipe_dev_read(void *opaque, target_phys_addr_t offset)
{
PipeDevice *dev = (PipeDevice *)opaque;
switch (offset) {
case PIPE_REG_STATUS:
DR("%s: REG_STATUS status=%d (0x%x)", __FUNCTION__, dev->status, dev->status);
return dev->status;
case PIPE_REG_CHANNEL:
if (dev->signaled_pipes != NULL) {
Pipe* pipe = dev->signaled_pipes;
DR("%s: channel=0x%x wanted=%d", __FUNCTION__,
pipe->channel, pipe->wanted);
dev->wakes = pipe->wanted;
pipe->wanted = 0;
dev->signaled_pipes = pipe->next_waked;
pipe->next_waked = NULL;
if (dev->signaled_pipes == NULL) {
goldfish_device_set_irq(&dev->dev, 0, 0);
DD("%s: lowering IRQ", __FUNCTION__);
}
return pipe->channel;
}
DR("%s: no signaled channels", __FUNCTION__);
return 0;
case PIPE_REG_WAKES:
DR("%s: wakes %d", __FUNCTION__, dev->wakes);
return dev->wakes;
default:
D("%s: offset=%d (0x%x)\n", __FUNCTION__, offset, offset);
}
return 0;
}
static CPUReadMemoryFunc *pipe_dev_readfn[] = {
pipe_dev_read,
pipe_dev_read,
pipe_dev_read
};
static CPUWriteMemoryFunc *pipe_dev_writefn[] = {
pipe_dev_write,
pipe_dev_write,
pipe_dev_write
};
static void
goldfish_pipe_save( QEMUFile* file, void* opaque )
{
PipeDevice* dev = opaque;
Pipe* pipe;
qemu_put_be32(file, dev->address);
qemu_put_be32(file, dev->size);
qemu_put_be32(file, dev->status);
qemu_put_be32(file, dev->channel);
qemu_put_be32(file, dev->wakes);
/* Count the number of pipe connections */
int count = 0;
for ( pipe = dev->pipes; pipe; pipe = pipe->next )
count++;
qemu_put_sbe32(file, count);
/* Now save each pipe one after the other */
for ( pipe = dev->pipes; pipe; pipe = pipe->next ) {
pipe_save(pipe, file);
}
}
static int
goldfish_pipe_load( QEMUFile* file, void* opaque, int version_id )
{
PipeDevice* dev = opaque;
Pipe* pipe;
if (version_id != GOLDFISH_PIPE_SAVE_VERSION)
return -EINVAL;
dev->address = qemu_get_be32(file);
dev->size = qemu_get_be32(file);
dev->status = qemu_get_be32(file);
dev->channel = qemu_get_be32(file);
dev->wakes = qemu_get_be32(file);
/* Count the number of pipe connections */
int count = qemu_get_sbe32(file);
/* Load all pipe connections */
for ( ; count > 0; count-- ) {
pipe = pipe_load(dev, file);
if (pipe == NULL) {
return -EIO;
}
pipe->next = dev->pipes;
dev->pipes = pipe;
}
/* Now we need to wake/close all relevant pipes */
for ( pipe = dev->pipes; pipe; pipe = pipe->next ) {
if (pipe->wanted != 0)
goldfish_pipe_wake(pipe, pipe->wanted);
if (pipe->closed != 0)
goldfish_pipe_close(pipe);
}
return 0;
}
/* initialize the trace device */
void pipe_dev_init()
{
PipeDevice *s;
s = (PipeDevice *) qemu_mallocz(sizeof(*s));
s->dev.name = "qemu_pipe";
s->dev.id = -1;
s->dev.base = 0; // will be allocated dynamically
s->dev.size = 0x2000;
s->dev.irq = 0;
s->dev.irq_count = 1;
goldfish_device_add(&s->dev, pipe_dev_readfn, pipe_dev_writefn, s);
register_savevm( "goldfish_pipe", 0, GOLDFISH_PIPE_SAVE_VERSION,
goldfish_pipe_save, goldfish_pipe_load, s);
#if DEBUG_ZERO_PIPE
goldfish_pipe_add_type("zero", NULL, &zeroPipe_funcs);
#endif
#if DEBUG_PINGPONG_PIPE
goldfish_pipe_add_type("pingpong", NULL, &pingPongPipe_funcs);
#endif
#if DEBUG_THROTTLE_PIPE
goldfish_pipe_add_type("throttle", NULL, &throttlePipe_funcs);
#endif
}
void
goldfish_pipe_wake( void* hwpipe, unsigned flags )
{
Pipe* pipe = hwpipe;
Pipe** lookup;
PipeDevice* dev = pipe->device;
DD("%s: channel=0x%x flags=%d", __FUNCTION__, pipe->channel, flags);
/* If not already there, add to the list of signaled pipes */
lookup = pipe_list_findp_waked(&dev->signaled_pipes, pipe);
if (!*lookup) {
pipe->next_waked = dev->signaled_pipes;
dev->signaled_pipes = pipe;
}
pipe->wanted |= (unsigned)flags;
/* Raise IRQ to indicate there are items on our list ! */
goldfish_device_set_irq(&dev->dev, 0, 1);
DD("%s: raising IRQ", __FUNCTION__);
}
void
goldfish_pipe_close( void* hwpipe )
{
Pipe* pipe = hwpipe;
D("%s: channel=0x%x (closed=%d)", __FUNCTION__, pipe->channel, pipe->closed);
if (!pipe->closed) {
pipe->closed = 1;
goldfish_pipe_wake( hwpipe, PIPE_WAKE_CLOSED );
}
}