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libcxl.c
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libcxl.c
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/*
* Copyright 2014,2015 International Business Machines
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#define _GNU_SOURCE /* For asprintf */
#define _DEFAULT_SOURCE
#define __STDC_FORMAT_MACROS
#include <inttypes.h>
#include <assert.h>
#include <unistd.h>
#include <dirent.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <err.h>
#include <stdio.h>
#include <fcntl.h>
#include <regex.h>
#include <poll.h>
#include <sys/ioctl.h>
#include <sys/sysmacros.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <sys/mman.h>
#include <setjmp.h>
#include "libcxl.h"
#include <misc/cxl.h>
#include "libcxl_internal.h"
#if defined CXL_START_WORK_TID
#include <syscall.h>
#endif
#undef DEBUG
#ifdef DEBUG
#define _s1(x) #x
#define _s(x) _s1(x)
#define pr_devel(...) \
fprintf(stderr, _s(__FILE__) ":" _s(__LINE__) ": " __VA_ARGS__ );
#define pr_here() \
pr_devel("<-- DEBUG TRACE -->\n");
#else
#define pr_devel(...) do { } while (0);
#define pr_here() do { } while (0);
#endif
#define CXL_EVENT_READ_FAIL 0xffff
static struct cxl_adapter_h * malloc_adapter(void)
{
struct cxl_adapter_h *adapter;
if (!(adapter = malloc(sizeof(struct cxl_adapter_h))))
return NULL;
memset(adapter, 0, sizeof(struct cxl_adapter_h));
return adapter;
}
char * cxl_adapter_dev_name(struct cxl_adapter_h *adapter)
{
return adapter->enum_ent->d_name;
}
static struct cxl_afu_h * malloc_afu(void)
{
struct cxl_afu_h *afu;
if (!(afu = malloc(sizeof(struct cxl_afu_h))))
return NULL;
memset(afu, 0, sizeof(struct cxl_afu_h));
afu->fd = -1;
afu->process_element = -1;
afu->mmio_addr = NULL;
afu->dev_name = NULL;
afu->sysfs_path = NULL;
afu->fd_errbuff = -1;
afu->errbuff_size = -1;
#if defined CXL_START_WORK_TID
afu->pid = -1;
#endif
return afu;
}
char * cxl_afu_dev_name(struct cxl_afu_h *afu)
{
if (afu->enum_ent)
return afu->enum_ent->d_name;
return afu->dev_name;
}
int cxl_afu_fd(struct cxl_afu_h *afu)
{
return afu->fd;
}
/*
* Adapter Enumeration
*/
static int is_cxl_adapter_filename(char *name)
{
int rc;
regex_t preg;
if (*name != 'c')
return 0;
if (regcomp(&preg, "^card[0-9]\\+$", REG_NOSUB))
return 0;
rc = (regexec(&preg, name, 0, NULL, 0) != REG_NOMATCH);
regfree(&preg);
return rc;
}
static int is_cxl_afu_filename(char *name)
{
int rc;
regex_t preg;
if (*name != 'a')
return 0;
if (regcomp(&preg, "^afu[0-9]\\+\\.[0-9]\\+$", REG_NOSUB))
return 0;
rc = (regexec(&preg, name, 0, NULL, 0) != REG_NOMATCH);
regfree(&preg);
return rc;
}
static int cxl_sysfs_adapter(char **bufp, struct cxl_adapter_h *adapter)
{
return asprintf(bufp, CXL_SYSFS_CLASS"/%s",
cxl_adapter_dev_name(adapter));
}
struct cxl_adapter_h * cxl_adapter_next(struct cxl_adapter_h *adapter)
{
if (adapter == NULL) {
if (!(adapter = malloc_adapter()))
return NULL;
memset(adapter, 0, sizeof(struct cxl_adapter_h));
if (!(adapter->enum_dir = opendir(CXL_SYSFS_CLASS))) {
if (errno == ENOENT)
errno = ENODEV;
goto end;
}
}
errno = 0;
do {
if (!(adapter->enum_ent = readdir(adapter->enum_dir)))
goto end;
} while (!is_cxl_adapter_filename(adapter->enum_ent->d_name));
if (cxl_sysfs_adapter(&adapter->sysfs_path, adapter) == -1)
goto end;
return adapter;
end:
cxl_adapter_free(adapter);
return NULL;
}
void cxl_adapter_free(struct cxl_adapter_h *adapter)
{
if (!adapter)
return;
if (adapter->enum_dir)
closedir(adapter->enum_dir);
if (adapter->sysfs_path)
free(adapter->sysfs_path);
free(adapter);
}
/*
* AFU Enumeration
*/
static void _cxl_afu_free(struct cxl_afu_h *afu, int free_adapter)
{
if (!afu)
return;
if (afu->enum_dir)
closedir(afu->enum_dir);
if (afu->sysfs_path)
free(afu->sysfs_path);
if (free_adapter && afu->adapter)
cxl_adapter_free(afu->adapter);
if (afu->mmio_addr)
cxl_mmio_unmap(afu);
if (afu->fd != -1)
close(afu->fd);
if (afu->fd_errbuff != -1)
close(afu->fd_errbuff);
if (afu->dev_name)
free(afu->dev_name);
if (afu->event_buf) {
free(afu->event_buf);
afu->event_buf = NULL;
}
free(afu);
}
void cxl_afu_free(struct cxl_afu_h *afu)
{
_cxl_afu_free(afu, 1);
}
int cxl_afu_opened(struct cxl_afu_h *afu)
{
if (afu == NULL) {
errno = EINVAL;
return -1;
}
return (afu->fd != -1);
}
static int cxl_sysfs_fd(char **bufp, struct cxl_afu_h *afu)
{
struct cxl_afu_id afuid;
char suffix = '\0';
int fd = cxl_afu_fd(afu);
/* fetch the afu id via ioctl to the kernel driver */
if (ioctl(fd, CXL_IOCTL_GET_AFU_ID, &afuid) < 0) {
struct stat sb;
/* if the ioctl is not recognized, fallback to old method */
if ((errno != EINVAL) || (fstat(fd, &sb) < 0) ||
!S_ISCHR(sb.st_mode))
return -1;
return asprintf(bufp, "/sys/dev/char/%i:%i", major(sb.st_rdev),
minor(sb.st_rdev));
}
switch (afuid.afu_mode) {
case CXL_MODE_DEDICATED:
suffix = 'd';
break;
case CXL_MODE_DIRECTED:
suffix = (afuid.flags & CXL_AFUID_FLAG_SLAVE) ? 's' : 'm';
break;
default:
errno = EINVAL;
return -1;
}
return asprintf(bufp, "/sys/class/cxl/afu%i.%i%c", afuid.card_id,
afuid.afu_offset, suffix);
}
static int cxl_afu_sysfs(struct cxl_afu_h *afu, char **bufp)
{
if (afu->fd >= 0)
return cxl_sysfs_fd(bufp, afu);
return asprintf(bufp, CXL_SYSFS_CLASS"/%s", cxl_afu_dev_name(afu));
}
struct cxl_afu_h *
cxl_adapter_afu_next(struct cxl_adapter_h *adapter, struct cxl_afu_h *afu)
{
char *dir_path;
if (afu == NULL) {
assert(adapter);
if (!(afu = malloc_afu()))
return NULL;
if (cxl_sysfs_adapter(&dir_path, adapter) == -1)
goto end;
if (!(afu->enum_dir = opendir(dir_path)))
goto err_free;
}
errno = 0;
do {
if (!(afu->enum_ent = readdir(afu->enum_dir)))
goto end;
} while (!is_cxl_afu_filename(afu->enum_ent->d_name));
if (cxl_afu_sysfs(afu, &afu->sysfs_path) == -1)
goto err_free;
return afu;
err_free:
free(dir_path);
end:
_cxl_afu_free(afu, 0);
return NULL;
}
struct cxl_afu_h * cxl_afu_next(struct cxl_afu_h *afu)
{
struct cxl_adapter_h *adapter = NULL;
if (afu)
adapter = afu->adapter;
else if (!(adapter = cxl_adapter_next(NULL)))
return NULL;
do {
if ((afu = cxl_adapter_afu_next(adapter, afu)))
afu->adapter = adapter;
else
adapter = cxl_adapter_next(adapter);
} while (adapter && !afu);
return afu;
}
static int sysfs_subsystem(char **bufp, const char *path)
{
char *subsystem_path, *name, *buf;
char subsystem_link[256];
int len;
int rc = -1;
if ((asprintf(&subsystem_path, "%s/subsystem", path)) == -1)
return -1;
/* lstat returns sb.st_size == 0 for symlinks in /sys (WTF WHY???), so
* we use a static buffer since we have NFI how large to allocate */
if ((len = readlink(subsystem_path, subsystem_link, sizeof(subsystem_link) - 1)) == -1)
goto out;
if (len >= sizeof(subsystem_link) - 1)
goto out;
subsystem_link[len] = '\0';
name = basename(subsystem_link);
if (!(buf = malloc(strlen(name) + 1)))
goto out;
strcpy(buf, name);
*bufp = buf;
rc = 0;
out:
free(subsystem_path);
return rc;
}
int cxl_afu_sysfs_pci(struct cxl_afu_h *afu, char **pathp)
{
char *path, *new_path, *subsys;
struct stat sb;
if (afu == NULL || pathp == NULL) {
errno = EINVAL;
return -1;
}
if ((path = strdup(afu->sysfs_path)) == NULL)
return -1;
do {
if ((asprintf(&new_path, "%s/device", path)) == -1)
goto err;
free(path);
path = new_path;
if ((sysfs_subsystem(&subsys, path)) == -1) {
if (errno == ENOENT)
continue;
goto err;
}
if (!(strcmp(subsys, "pci"))) {
free(subsys);
*pathp = path;
return 0;
}
free(subsys);
} while (stat(path, &sb) != -1);
err:
free(path);
return -1;
}
static int major_minor_match(int dirfd, char *dev_name, int major, int minor)
{
struct stat sb;
if (fstatat(dirfd, dev_name, &sb, 0) == -1)
return 0;
if (!S_ISCHR(sb.st_mode))
return 0;
return major(sb.st_rdev) == major && minor(sb.st_rdev) == minor;
}
static char *find_dev_name(int major, int minor)
{
int saved_errno;
DIR *enum_dir;
struct dirent *enum_ent;
int fd;
char *dev_name = NULL;
if ((enum_dir = opendir(CXL_DEV_DIR)) == NULL)
return NULL;
fd = dirfd(enum_dir);
saved_errno = errno;
errno = 0;
do {
if (!(enum_ent = readdir(enum_dir))) {
if (errno == 0)
errno = saved_errno;
goto err_exit;
}
} while (!major_minor_match(fd, enum_ent->d_name, major, minor));
if ((dev_name = strdup(enum_ent->d_name)) == NULL)
goto err_exit;
closedir(enum_dir);
return dev_name;
err_exit:
closedir(enum_dir);
return NULL;
}
int cxl_afu_get_process_element(struct cxl_afu_h *afu)
{
int process_element;
int rc;
if (afu == NULL) {
errno = EINVAL;
return -1;
}
if (afu->process_element >= 0)
/* return cached version */
return afu->process_element;
rc = ioctl(afu->fd, CXL_IOCTL_GET_PROCESS_ELEMENT, &process_element);
if (rc < 0)
return rc;
afu->process_element = process_element;
return process_element;
}
/* Open Functions */
static int open_afu_dev(struct cxl_afu_h *afu, char *path)
{
struct stat sb;
long api_version;
int fd;
if ((fd = open(path, O_RDWR | O_CLOEXEC)) < 0)
return fd;
afu->fd = fd;
/* Verify that this is an AFU file we just opened */
if (fstat(fd, &sb) < 0)
goto err;
if (!S_ISCHR(sb.st_mode))
goto err;
if (!(afu->dev_name = find_dev_name(major(sb.st_rdev),
minor(sb.st_rdev))))
goto err;
if (! afu->sysfs_path)
if (cxl_afu_sysfs(afu, &afu->sysfs_path) == -1)
goto err;
if (cxl_get_api_version_compatible(afu, &api_version))
goto err;
if (api_version > CXL_KERNEL_API_VERSION) {
errno = EPROTO;
goto err_close;
}
return 0;
err:
errno = ENODEV;
err_close:
if (afu->dev_name)
free(afu->dev_name);
close(fd);
afu->fd = -1;
return -1;
}
struct cxl_afu_h * cxl_afu_open_dev(char *path)
{
struct cxl_afu_h *afu;
if (!(afu = malloc_afu()))
return NULL;
if (open_afu_dev(afu, path) < 0)
goto err;
return afu;
err:
cxl_afu_free(afu);
return NULL;
}
static char *new_sysfs_path(char *sysfs_path, enum cxl_views view)
{
char lastchar;
char *newpath;
switch (view) {
case CXL_VIEW_DEDICATED:
lastchar = 'd';
break;
case CXL_VIEW_MASTER:
lastchar = 'm';
break;
case CXL_VIEW_SLAVE:
lastchar = 's';
break;
default:
return NULL;
}
switch (*(sysfs_path + strlen(sysfs_path) - 1)) {
case 'd':
case 'm':
case 's':
if ((newpath = strdup(sysfs_path)) == NULL)
return NULL;
*(newpath + strlen(newpath) - 1) = lastchar;
break;
default:
if (asprintf(&newpath, "%s%c", sysfs_path, lastchar) == -1)
return NULL;
}
return newpath;
}
struct cxl_afu_h * cxl_afu_open_h(struct cxl_afu_h *afu, enum cxl_views view)
{
char *dev_name = NULL;
char *dev_path = NULL;
struct cxl_afu_h *new_afu = NULL;
long sysfs_major, sysfs_minor;
if (!(new_afu = malloc_afu()))
goto err_pass;
if (!(new_afu->sysfs_path = new_sysfs_path(afu->sysfs_path, view)))
goto err_pass;
if (cxl_get_dev(new_afu, &sysfs_major, &sysfs_minor) < 0)
goto err_exit;
if (!(dev_name = find_dev_name(sysfs_major, sysfs_minor)))
goto err_exit;
if (asprintf(&dev_path, CXL_DEV_DIR"/%s", dev_name) == -1)
goto err_pass;
if (open_afu_dev(new_afu, dev_path) < 0)
goto err_pass;
free(dev_name);
free(dev_path);
return new_afu;
err_exit:
errno = ENODEV;
err_pass:
if (dev_name)
free(dev_name);
if (dev_path)
free(dev_path);
if (new_afu)
free(new_afu);
return NULL;
}
struct cxl_afu_h * cxl_afu_fd_to_h(int fd)
{
struct cxl_afu_h *afu;
struct stat sb;
long api_version;
if (!(afu = malloc_afu()))
return NULL;
/* Verify that the passed in fd is an AFU fd */
if (fstat(fd, &sb) < 0)
goto err_exit;
afu->fd = fd;
if (S_ISCHR(sb.st_mode)) {
afu->dev_name = find_dev_name(major(sb.st_rdev), minor(sb.st_rdev));
if (!afu->dev_name)
goto enodev;
} else {
/* Could be an anonymous inode - see if the get_afu_id ioctl succeeds */
afu->dev_name = NULL;
}
if (cxl_afu_sysfs(afu, &afu->sysfs_path) == -1)
goto err_exit;
if (cxl_get_api_version_compatible(afu, &api_version))
goto err_exit;
if (api_version > CXL_KERNEL_API_VERSION) {
errno = EPROTO;
goto err_exit;
}
return afu;
enodev:
errno = ENODEV;
err_exit:
free(afu);
return NULL;
}
int cxl_afu_attach(struct cxl_afu_h *afu, __u64 wed)
{
struct cxl_ioctl_start_work work;
if (afu == NULL || afu->fd < 0) {
errno = EINVAL;
return -1;
}
#if defined CXL_START_WORK_TID
/* get the internal kernel "pid" of the Thread ID */
afu->pid = syscall(SYS_gettid);
#endif
memset(&work, 0, sizeof(work));
work.work_element_descriptor = wed;
return ioctl(afu->fd, CXL_IOCTL_START_WORK, &work);
}
int cxl_afu_attach_full(struct cxl_afu_h *afu, __u64 wed, __u16 num_interrupts,
__u64 amr)
{
struct cxl_ioctl_start_work work;
if (afu == NULL || afu->fd < 0) {
errno = EINVAL;
return -1;
}
#if defined CXL_START_WORK_TID
/* get the internal kernel "pid" of the Thread ID */
afu->pid = syscall(SYS_gettid);
#endif
memset(&work, 0, sizeof(work));
work.work_element_descriptor = wed;
work.flags = CXL_START_WORK_NUM_IRQS | CXL_START_WORK_AMR;
work.num_interrupts = num_interrupts;
work.amr = amr;
return ioctl(afu->fd, CXL_IOCTL_START_WORK, &work);
}
inline
int cxl_afu_attach_work(struct cxl_afu_h *afu,
struct cxl_ioctl_start_work *work)
{
if (afu == NULL || afu->fd < 0 || work == NULL) {
errno = EINVAL;
return -1;
}
#if defined CXL_START_WORK_TID
/* get the internal kernel "pid" of the Thread ID */
afu->pid = syscall(SYS_gettid);
#endif
return ioctl(afu->fd, CXL_IOCTL_START_WORK, work);
}
inline
struct cxl_ioctl_start_work *cxl_work_alloc(void)
{
return calloc(1, sizeof(struct cxl_ioctl_start_work));
}
inline
int cxl_work_free(struct cxl_ioctl_start_work *work)
{
if (work == NULL) {
errno = EINVAL;
return -1;
}
free(work);
return 0;
}
inline
int cxl_work_get_amr(struct cxl_ioctl_start_work *work, __u64 *valp)
{
if (work == NULL) {
errno = EINVAL;
return -1;
}
*valp = work->amr;
return 0;
}
inline
int cxl_work_get_num_irqs(struct cxl_ioctl_start_work *work, __s16 *valp)
{
if (work == NULL) {
errno = EINVAL;
return -1;
}
*valp = work->num_interrupts;
return 0;
}
inline
int cxl_work_get_wed(struct cxl_ioctl_start_work *work, __u64 *valp)
{
if (work == NULL) {
errno = EINVAL;
return -1;
}
*valp = work->work_element_descriptor;
return 0;
}
#if defined CXL_START_WORK_TID
inline
int cxl_work_get_tid(struct cxl_ioctl_start_work *work, __u16 *valp)
{
if (work == NULL || work->tid == -1) {
errno = EINVAL;
return -1;
}
*valp = work->tid;
return 0;
}
#endif
inline
int cxl_work_set_amr(struct cxl_ioctl_start_work *work, __u64 amr)
{
if (work == NULL) {
errno = EINVAL;
return -1;
}
work->amr = amr;
if (amr)
work->flags |= CXL_START_WORK_AMR;
else
work->flags &= ~(CXL_START_WORK_AMR);
return 0;
}
inline
int cxl_work_set_num_irqs(struct cxl_ioctl_start_work *work, __s16 irqs)
{
if (work == NULL) {
errno = EINVAL;
return -1;
}
work->num_interrupts = irqs;
if (irqs >= 0)
work->flags |= CXL_START_WORK_NUM_IRQS;
else
work->flags &= ~(CXL_START_WORK_NUM_IRQS);
return 0;
}
inline
int cxl_work_set_wed(struct cxl_ioctl_start_work *work, __u64 wed)
{
if (work == NULL) {
errno = EINVAL;
return -1;
}
work->work_element_descriptor = wed;
return 0;
}
#if defined CXL_START_WORK_TID
inline
int cxl_work_enable_wait(struct cxl_ioctl_start_work *work)
{
if (work == NULL) {
errno = EINVAL;
return -1;
}
work->flags |= CXL_START_WORK_TID;
return 0;
}
inline
int cxl_work_disable_wait(struct cxl_ioctl_start_work *work)
{
if (work == NULL) {
errno = EINVAL;
return -1;
}
work->flags &= ~(CXL_START_WORK_TID);
return 0;
}
#endif
/*
* Event description print helpers
*/
static int
cxl_fprint_afu_interrupt(FILE *stream, struct cxl_event_afu_interrupt *event)
{
return fprintf(stream, "AFU Interrupt %i\n", event->irq);
}
static int
cxl_fprint_data_storage(FILE *stream, struct cxl_event_data_storage *event)
{
return fprintf(stream, "AFU Invalid memory reference: 0x%"PRIx64"\n",
(uint64_t) event->addr);
}
static int
cxl_fprint_afu_error(FILE *stream, struct cxl_event_afu_error *event)
{
return fprintf(stream, "AFU Error: 0x%"PRIx64"\n",
(uint64_t) event->error);
}
static int hexdump(FILE *stream, __u8 *addr, ssize_t size)
{
unsigned i, j, c = 0;
for (i = 0; i < size; i += 4) {
for (j = i; j < size && j < i + 4; j++)
c += fprintf(stream, "%.2x", addr[j]);
c += fprintf(stream, " ");
}
c += fprintf(stream, "\n");
return c;
}
int
cxl_fprint_unknown_event(FILE *stream, struct cxl_event *event)
{
int ret;
if (!event) {
errno = EINVAL;
return -1;
}
ret = fprintf(stream, "CXL Unknown Event %i: ", event->header.type);
if (ret < 0)
return ret;
ret += hexdump(stream, (__u8 *)event, event->header.size);
return ret;
}
/*
* Print a description of the given event to the file stream.
*/
int
cxl_fprint_event(FILE *stream, struct cxl_event *event)
{
if (!event) {
errno = EINVAL;
return -1;
}
switch (event->header.type) {
case CXL_EVENT_READ_FAIL:
fprintf(stderr, "cxl_fprint_event: CXL Read failed\n");
errno = ENODATA;
return -1;
case CXL_EVENT_AFU_INTERRUPT:
return cxl_fprint_afu_interrupt(stream, &event->irq);
case CXL_EVENT_DATA_STORAGE:
return cxl_fprint_data_storage(stream, &event->fault);
case CXL_EVENT_AFU_ERROR:
return cxl_fprint_afu_error(stream, &event->afu_error);
default:
return cxl_fprint_unknown_event(stream, event);
}
}
static inline void poison(__u8 *ptr, ssize_t len)
{
unsigned int toxin = 0xDEADBEEF;
__u8 *end;
for (end = ptr + len; ptr < end; ptr++)
*ptr = (toxin >> (8 * (3 - ((uintptr_t)ptr % 4)))) & 0xff;
}
static inline int fetch_cached_event(struct cxl_afu_h *afu,
struct cxl_event *event)
{
int size;
/* Local events caches, let's send it out */
size = afu->event_buf_first->header.size;
memcpy(event, afu->event_buf_first, size);
afu->event_buf_first = (struct cxl_event *)
((char *)afu->event_buf_first + size);
assert(afu->event_buf_first <= afu->event_buf_end);
return 0;
}
static int event_cached(struct cxl_afu_h *afu)
{
return afu->event_buf_first != afu->event_buf_end;
}
int cxl_event_pending(struct cxl_afu_h *afu)
{
struct pollfd fds[1] = {{cxl_afu_fd(afu), POLLIN, 0}};
if (afu == NULL) {
errno = EINVAL;
return -1;
}
if (event_cached(afu))
return 1;
return poll(fds, 1, 0);
}
int cxl_read_event(struct cxl_afu_h *afu, struct cxl_event *event)
{
struct cxl_event *p = NULL;
ssize_t size;
int rc = 0;
if (afu == NULL || event == NULL) {
errno = EINVAL;
return -1;
}
/* Init buffer */
if (!afu->event_buf) {
p = malloc(CXL_READ_MIN_SIZE);
if (!p) {
errno = ENOMEM;
return -1;
}
afu->event_buf = p;
afu->event_buf_first = afu->event_buf;
afu->event_buf_end = afu->event_buf;
}
/* Send buffered event */
if (event_cached(afu)) {
rc = fetch_cached_event(afu, event);
return rc;
}
if (afu->fd < 0) {
errno = EINVAL;
return -1;
}
/* Looks like we need to go read some data from the kernel */
size = read(afu->fd, afu->event_buf, CXL_READ_MIN_SIZE);
if (size <= 0) {
poison((__u8 *)event, sizeof(*event));
event->header.type = CXL_EVENT_READ_FAIL;
event->header.size = 0;
if (size < 0)
return size;
errno = ENODATA;
return -1;
}
/* check for at least 1 event */
assert(size >= afu->event_buf->header.size);
afu->event_buf_first = afu->event_buf;
afu->event_buf_end = (struct cxl_event *)
((char *)afu->event_buf + size);
return fetch_cached_event(afu, event);
}
/*
* Read an event from the AFU when an event of type is expected. For AFU
* interrupts, the expected AFU interrupt number may also be supplied (0 will
* accept any AFU interrupt).
*
* Returns 0 if the read event was of the expected type and (if applicable)
* AFU interrupt number. If the event did not match the type & interrupt
* number, it returns -1.
*
* If the read() syscall failed for some reason (e.g. no event pending when
* using non-blocking IO, etc) it will return -2 and errno will be set
* appropriately.