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[Qemu-devel] [PATCH v4 2/5] Add Error **errp for xen_host_pci_device_get
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From: |
Cao jin |
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Subject: |
[Qemu-devel] [PATCH v4 2/5] Add Error **errp for xen_host_pci_device_get() |
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Date: |
Fri, 8 Jan 2016 16:37:51 +0800 |
To catch the error msg. Also modify the caller
Signed-off-by: Cao jin <address@hidden>
---
hw/xen/xen-host-pci-device.c | 134 ++++++++++++++++++++++---------------------
hw/xen/xen-host-pci-device.h | 5 +-
hw/xen/xen_pt.c | 13 +++--
3 files changed, 81 insertions(+), 71 deletions(-)
diff --git a/hw/xen/xen-host-pci-device.c b/hw/xen/xen-host-pci-device.c
index 351b61a..b8ec016 100644
--- a/hw/xen/xen-host-pci-device.c
+++ b/hw/xen/xen-host-pci-device.c
@@ -31,8 +31,8 @@
#define IORESOURCE_PREFETCH 0x00001000 /* No side effects */
#define IORESOURCE_MEM_64 0x00100000
-static int xen_host_pci_sysfs_path(const XenHostPCIDevice *d,
- const char *name, char *buf, ssize_t size)
+static void xen_host_pci_sysfs_path(const XenHostPCIDevice *d,
+ const char *name, char *buf, ssize_t size)
{
int rc;
@@ -40,16 +40,16 @@ static int xen_host_pci_sysfs_path(const XenHostPCIDevice
*d,
d->domain, d->bus, d->dev, d->func, name);
if (rc >= size || rc < 0) {
- /* The output is truncated, or some other error was encountered */
- return -ENODEV;
+ /* The output is truncated, or some other error was encountered.
+ * Assert here since user can do nothing in case of failure */
+ assert(0);
}
- return 0;
}
/* This size should be enough to read the first 7 lines of a resource file */
#define XEN_HOST_PCI_RESOURCE_BUFFER_SIZE 400
-static int xen_host_pci_get_resource(XenHostPCIDevice *d)
+static void xen_host_pci_get_resource(XenHostPCIDevice *d, Error **errp)
{
int i, rc, fd;
char path[PATH_MAX];
@@ -58,25 +58,22 @@ static int xen_host_pci_get_resource(XenHostPCIDevice *d)
char *endptr, *s;
uint8_t type;
- rc = xen_host_pci_sysfs_path(d, "resource", path, sizeof (path));
- if (rc) {
- return rc;
- }
+ xen_host_pci_sysfs_path(d, "resource", path, sizeof(path));
+
fd = open(path, O_RDONLY);
if (fd == -1) {
- XEN_HOST_PCI_LOG("Error: Can't open %s: %s\n", path, strerror(errno));
- return -errno;
+ error_setg_file_open(errp, errno, path);
+ return;
}
do {
- rc = read(fd, &buf, sizeof (buf) - 1);
+ rc = read(fd, &buf, sizeof(buf) - 1);
if (rc < 0 && errno != EINTR) {
- rc = -errno;
+ error_setg_errno(errp, errno, "read err");
goto out;
}
} while (rc < 0);
buf[rc] = 0;
- rc = 0;
s = buf;
for (i = 0; i < PCI_NUM_REGIONS; i++) {
@@ -129,20 +126,19 @@ static int xen_host_pci_get_resource(XenHostPCIDevice *d)
d->rom.bus_flags = flags & IORESOURCE_BITS;
}
}
+
if (i != PCI_NUM_REGIONS) {
- /* Invalid format or input to short */
- rc = -ENODEV;
+ error_setg(errp, "Invalid format or input too short: %s", buf);
}
out:
close(fd);
- return rc;
}
/* This size should be enough to read a long from a file */
#define XEN_HOST_PCI_GET_VALUE_BUFFER_SIZE 22
-static int xen_host_pci_get_value(XenHostPCIDevice *d, const char *name,
- unsigned int *pvalue, int base)
+static void xen_host_pci_get_value(XenHostPCIDevice *d, const char *name,
+ unsigned int *pvalue, int base, Error
**errp)
{
char path[PATH_MAX];
char buf[XEN_HOST_PCI_GET_VALUE_BUFFER_SIZE];
@@ -150,44 +146,50 @@ static int xen_host_pci_get_value(XenHostPCIDevice *d,
const char *name,
unsigned long value;
const char *endptr;
- rc = xen_host_pci_sysfs_path(d, name, path, sizeof (path));
- if (rc) {
- return rc;
- }
+ xen_host_pci_sysfs_path(d, name, path, sizeof(path));
+
fd = open(path, O_RDONLY);
if (fd == -1) {
- XEN_HOST_PCI_LOG("Error: Can't open %s: %s\n", path, strerror(errno));
- return -errno;
+ error_setg_file_open(errp, errno, path);
+ return;
}
+
do {
- rc = read(fd, &buf, sizeof (buf) - 1);
+ rc = read(fd, &buf, sizeof(buf) - 1);
if (rc < 0 && errno != EINTR) {
- rc = -errno;
+ error_setg_errno(errp, errno, "read err");
goto out;
}
} while (rc < 0);
+
buf[rc] = 0;
rc = qemu_strtoul(buf, &endptr, base, &value);
if (!rc) {
*pvalue = value;
+ } else if (rc == -EINVAL) {
+ error_setg(errp, "strtoul: Invalid argument");
+ } else {
+ error_setg_errno(errp, errno, "strtoul err");
}
+
out:
close(fd);
- return rc;
}
-static inline int xen_host_pci_get_hex_value(XenHostPCIDevice *d,
+static inline void xen_host_pci_get_hex_value(XenHostPCIDevice *d,
const char *name,
- unsigned int *pvalue)
+ unsigned int *pvalue,
+ Error **errp)
{
- return xen_host_pci_get_value(d, name, pvalue, 16);
+ xen_host_pci_get_value(d, name, pvalue, 16, errp);
}
-static inline int xen_host_pci_get_dec_value(XenHostPCIDevice *d,
+static inline void xen_host_pci_get_dec_value(XenHostPCIDevice *d,
const char *name,
- unsigned int *pvalue)
+ unsigned int *pvalue,
+ Error **errp)
{
- return xen_host_pci_get_value(d, name, pvalue, 10);
+ xen_host_pci_get_value(d, name, pvalue, 10, errp);
}
static bool xen_host_pci_dev_is_virtfn(XenHostPCIDevice *d)
@@ -195,26 +197,21 @@ static bool xen_host_pci_dev_is_virtfn(XenHostPCIDevice
*d)
char path[PATH_MAX];
struct stat buf;
- if (xen_host_pci_sysfs_path(d, "physfn", path, sizeof (path))) {
- return false;
- }
+ xen_host_pci_sysfs_path(d, "physfn", path, sizeof(path));
+
return !stat(path, &buf);
}
-static int xen_host_pci_config_open(XenHostPCIDevice *d)
+static void xen_host_pci_config_open(XenHostPCIDevice *d, Error **errp)
{
char path[PATH_MAX];
- int rc;
- rc = xen_host_pci_sysfs_path(d, "config", path, sizeof (path));
- if (rc) {
- return rc;
- }
+ xen_host_pci_sysfs_path(d, "config", path, sizeof(path));
+
d->config_fd = open(path, O_RDWR);
- if (d->config_fd < 0) {
- return -errno;
+ if (d->config_fd == -1) {
+ error_setg_file_open(errp, errno, path);
}
- return 0;
}
static int xen_host_pci_config_read(XenHostPCIDevice *d,
@@ -336,11 +333,12 @@ int xen_host_pci_find_ext_cap_offset(XenHostPCIDevice *d,
uint32_t cap)
return -1;
}
-int xen_host_pci_device_get(XenHostPCIDevice *d, uint16_t domain,
- uint8_t bus, uint8_t dev, uint8_t func)
+void xen_host_pci_device_get(XenHostPCIDevice *d, uint16_t domain,
+ uint8_t bus, uint8_t dev, uint8_t func,
+ Error **errp)
{
unsigned int v;
- int rc = 0;
+ Error *err = NULL;
d->config_fd = -1;
d->domain = domain;
@@ -348,43 +346,51 @@ int xen_host_pci_device_get(XenHostPCIDevice *d, uint16_t
domain,
d->dev = dev;
d->func = func;
- rc = xen_host_pci_config_open(d);
- if (rc) {
+ xen_host_pci_config_open(d, &err);
+ if (err) {
goto error;
}
- rc = xen_host_pci_get_resource(d);
- if (rc) {
+
+ xen_host_pci_get_resource(d, &err);
+ if (err) {
goto error;
}
- rc = xen_host_pci_get_hex_value(d, "vendor", &v);
- if (rc) {
+
+ xen_host_pci_get_hex_value(d, "vendor", &v, &err);
+ if (err) {
goto error;
}
d->vendor_id = v;
- rc = xen_host_pci_get_hex_value(d, "device", &v);
- if (rc) {
+
+ xen_host_pci_get_hex_value(d, "device", &v, &err);
+ if (err) {
goto error;
}
d->device_id = v;
- rc = xen_host_pci_get_dec_value(d, "irq", &v);
- if (rc) {
+
+ xen_host_pci_get_dec_value(d, "irq", &v, &err);
+ if (err) {
goto error;
}
d->irq = v;
- rc = xen_host_pci_get_hex_value(d, "class", &v);
- if (rc) {
+
+ xen_host_pci_get_hex_value(d, "class", &v, &err);
+ if (err) {
goto error;
}
d->class_code = v;
+
d->is_virtfn = xen_host_pci_dev_is_virtfn(d);
- return 0;
+ return;
+
error:
+ error_propagate(errp, err);
+
if (d->config_fd >= 0) {
close(d->config_fd);
d->config_fd = -1;
}
- return rc;
}
bool xen_host_pci_device_closed(XenHostPCIDevice *d)
diff --git a/hw/xen/xen-host-pci-device.h b/hw/xen/xen-host-pci-device.h
index 3d44e04..42b9138 100644
--- a/hw/xen/xen-host-pci-device.h
+++ b/hw/xen/xen-host-pci-device.h
@@ -36,8 +36,9 @@ typedef struct XenHostPCIDevice {
int config_fd;
} XenHostPCIDevice;
-int xen_host_pci_device_get(XenHostPCIDevice *d, uint16_t domain,
- uint8_t bus, uint8_t dev, uint8_t func);
+void xen_host_pci_device_get(XenHostPCIDevice *d, uint16_t domain,
+ uint8_t bus, uint8_t dev, uint8_t func,
+ Error **errp);
void xen_host_pci_device_put(XenHostPCIDevice *pci_dev);
bool xen_host_pci_device_closed(XenHostPCIDevice *d);
diff --git a/hw/xen/xen_pt.c b/hw/xen/xen_pt.c
index aa96288..53b5bca 100644
--- a/hw/xen/xen_pt.c
+++ b/hw/xen/xen_pt.c
@@ -767,6 +767,7 @@ static int xen_pt_initfn(PCIDevice *d)
uint8_t machine_irq = 0, scratch;
uint16_t cmd = 0;
int pirq = XEN_PT_UNASSIGNED_PIRQ;
+ Error *err = NULL;
/* register real device */
XEN_PT_LOG(d, "Assigning real physical device %02x:%02x.%d"
@@ -774,11 +775,13 @@ static int xen_pt_initfn(PCIDevice *d)
s->hostaddr.bus, s->hostaddr.slot, s->hostaddr.function,
s->dev.devfn);
- rc = xen_host_pci_device_get(&s->real_device,
- s->hostaddr.domain, s->hostaddr.bus,
- s->hostaddr.slot, s->hostaddr.function);
- if (rc) {
- XEN_PT_ERR(d, "Failed to \"open\" the real pci device. rc: %i\n", rc);
+ xen_host_pci_device_get(&s->real_device,
+ s->hostaddr.domain, s->hostaddr.bus,
+ s->hostaddr.slot, s->hostaddr.function,
+ &err);
+ if (err) {
+ error_append_hint(&err, "Failed to \"open\" the real pci device");
+ error_report_err(err);
return -1;
}
--
2.1.0