#include <linux/pci.h>
#include <linux/module.h>
#include <linux/sched.h>
+#include <linux/slab.h>
#include <linux/ioport.h>
#include <linux/wait.h>
* configuration space.
*/
-static DEFINE_SPINLOCK(pci_lock);
+static DEFINE_RAW_SPINLOCK(pci_lock);
/*
* Wrappers for all PCI configuration access functions. They just check
unsigned long flags; \
u32 data = 0; \
if (PCI_##size##_BAD) return PCIBIOS_BAD_REGISTER_NUMBER; \
- spin_lock_irqsave(&pci_lock, flags); \
+ raw_spin_lock_irqsave(&pci_lock, flags); \
res = bus->ops->read(bus, devfn, pos, len, &data); \
*value = (type)data; \
- spin_unlock_irqrestore(&pci_lock, flags); \
+ raw_spin_unlock_irqrestore(&pci_lock, flags); \
return res; \
}
int res; \
unsigned long flags; \
if (PCI_##size##_BAD) return PCIBIOS_BAD_REGISTER_NUMBER; \
- spin_lock_irqsave(&pci_lock, flags); \
+ raw_spin_lock_irqsave(&pci_lock, flags); \
res = bus->ops->write(bus, devfn, pos, len, value); \
- spin_unlock_irqrestore(&pci_lock, flags); \
+ raw_spin_unlock_irqrestore(&pci_lock, flags); \
return res; \
}
EXPORT_SYMBOL(pci_bus_write_config_word);
EXPORT_SYMBOL(pci_bus_write_config_dword);
+/**
+ * pci_bus_set_ops - Set raw operations of pci bus
+ * @bus: pci bus struct
+ * @ops: new raw operations
+ *
+ * Return previous raw operations
+ */
+struct pci_ops *pci_bus_set_ops(struct pci_bus *bus, struct pci_ops *ops)
+{
+ struct pci_ops *old_ops;
+ unsigned long flags;
+
+ raw_spin_lock_irqsave(&pci_lock, flags);
+ old_ops = bus->ops;
+ bus->ops = ops;
+ raw_spin_unlock_irqrestore(&pci_lock, flags);
+ return old_ops;
+}
+EXPORT_SYMBOL(pci_bus_set_ops);
+
+/**
+ * pci_read_vpd - Read one entry from Vital Product Data
+ * @dev: pci device struct
+ * @pos: offset in vpd space
+ * @count: number of bytes to read
+ * @buf: pointer to where to store result
+ *
+ */
+ssize_t pci_read_vpd(struct pci_dev *dev, loff_t pos, size_t count, void *buf)
+{
+ if (!dev->vpd || !dev->vpd->ops)
+ return -ENODEV;
+ return dev->vpd->ops->read(dev, pos, count, buf);
+}
+EXPORT_SYMBOL(pci_read_vpd);
+
+/**
+ * pci_write_vpd - Write entry to Vital Product Data
+ * @dev: pci device struct
+ * @pos: offset in vpd space
+ * @count: number of bytes to write
+ * @buf: buffer containing write data
+ *
+ */
+ssize_t pci_write_vpd(struct pci_dev *dev, loff_t pos, size_t count, const void *buf)
+{
+ if (!dev->vpd || !dev->vpd->ops)
+ return -ENODEV;
+ return dev->vpd->ops->write(dev, pos, count, buf);
+}
+EXPORT_SYMBOL(pci_write_vpd);
+
/*
* The following routines are to prevent the user from accessing PCI config
* space when it's unsafe to do so. Some devices require this during BIST and
__add_wait_queue(&pci_ucfg_wait, &wait);
do {
set_current_state(TASK_UNINTERRUPTIBLE);
- spin_unlock_irq(&pci_lock);
+ raw_spin_unlock_irq(&pci_lock);
schedule();
- spin_lock_irq(&pci_lock);
+ raw_spin_lock_irq(&pci_lock);
} while (dev->block_ucfg_access);
__remove_wait_queue(&pci_ucfg_wait, &wait);
}
int ret = 0; \
u32 data = -1; \
if (PCI_##size##_BAD) return PCIBIOS_BAD_REGISTER_NUMBER; \
- spin_lock_irq(&pci_lock); \
+ raw_spin_lock_irq(&pci_lock); \
if (unlikely(dev->block_ucfg_access)) pci_wait_ucfg(dev); \
ret = dev->bus->ops->read(dev->bus, dev->devfn, \
pos, sizeof(type), &data); \
- spin_unlock_irq(&pci_lock); \
+ raw_spin_unlock_irq(&pci_lock); \
*val = (type)data; \
return ret; \
}
{ \
int ret = -EIO; \
if (PCI_##size##_BAD) return PCIBIOS_BAD_REGISTER_NUMBER; \
- spin_lock_irq(&pci_lock); \
+ raw_spin_lock_irq(&pci_lock); \
if (unlikely(dev->block_ucfg_access)) pci_wait_ucfg(dev); \
ret = dev->bus->ops->write(dev->bus, dev->devfn, \
pos, sizeof(type), val); \
- spin_unlock_irq(&pci_lock); \
+ raw_spin_unlock_irq(&pci_lock); \
return ret; \
}
struct pci_vpd_pci22 {
struct pci_vpd base;
- spinlock_t lock; /* controls access to hardware and the flags */
- u8 cap;
+ struct mutex lock;
+ u16 flag;
bool busy;
- bool flag; /* value of F bit to wait for */
+ u8 cap;
};
-/* Wait for last operation to complete */
+/*
+ * Wait for last operation to complete.
+ * This code has to spin since there is no other notification from the PCI
+ * hardware. Since the VPD is often implemented by serial attachment to an
+ * EEPROM, it may take many milliseconds to complete.
+ */
static int pci_vpd_pci22_wait(struct pci_dev *dev)
{
struct pci_vpd_pci22 *vpd =
container_of(dev->vpd, struct pci_vpd_pci22, base);
- u16 flag, status;
- int wait;
+ unsigned long timeout = jiffies + HZ/20 + 2;
+ u16 status;
int ret;
if (!vpd->busy)
return 0;
- flag = vpd->flag ? PCI_VPD_ADDR_F : 0;
- wait = vpd->flag ? 10 : 1000; /* read: 100 us; write: 10 ms */
for (;;) {
- ret = pci_user_read_config_word(dev,
- vpd->cap + PCI_VPD_ADDR,
+ ret = pci_user_read_config_word(dev, vpd->cap + PCI_VPD_ADDR,
&status);
- if (ret < 0)
+ if (ret)
return ret;
- if ((status & PCI_VPD_ADDR_F) == flag) {
+
+ if ((status & PCI_VPD_ADDR_F) == vpd->flag) {
vpd->busy = false;
return 0;
}
- if (wait-- == 0)
+
+ if (time_after(jiffies, timeout))
return -ETIMEDOUT;
- udelay(10);
+ if (fatal_signal_pending(current))
+ return -EINTR;
+ if (!cond_resched())
+ udelay(10);
}
}
-static int pci_vpd_pci22_read(struct pci_dev *dev, int pos, int size,
- char *buf)
+static ssize_t pci_vpd_pci22_read(struct pci_dev *dev, loff_t pos, size_t count,
+ void *arg)
{
struct pci_vpd_pci22 *vpd =
container_of(dev->vpd, struct pci_vpd_pci22, base);
- u32 val;
int ret;
- int begin, end, i;
+ loff_t end = pos + count;
+ u8 *buf = arg;
- if (pos < 0 || pos > vpd->base.len || size > vpd->base.len - pos)
+ if (pos < 0 || pos > vpd->base.len || end > vpd->base.len)
return -EINVAL;
- if (size == 0)
- return 0;
- spin_lock_irq(&vpd->lock);
- ret = pci_vpd_pci22_wait(dev);
- if (ret < 0)
- goto out;
- ret = pci_user_write_config_word(dev, vpd->cap + PCI_VPD_ADDR,
- pos & ~3);
- if (ret < 0)
- goto out;
- vpd->busy = true;
- vpd->flag = 1;
+ if (mutex_lock_killable(&vpd->lock))
+ return -EINTR;
+
ret = pci_vpd_pci22_wait(dev);
if (ret < 0)
goto out;
- ret = pci_user_read_config_dword(dev, vpd->cap + PCI_VPD_DATA,
- &val);
-out:
- spin_unlock_irq(&vpd->lock);
- if (ret < 0)
- return ret;
-
- /* Convert to bytes */
- begin = pos & 3;
- end = min(4, begin + size);
- for (i = 0; i < end; ++i) {
- if (i >= begin)
- *buf++ = val;
- val >>= 8;
+
+ while (pos < end) {
+ u32 val;
+ unsigned int i, skip;
+
+ ret = pci_user_write_config_word(dev, vpd->cap + PCI_VPD_ADDR,
+ pos & ~3);
+ if (ret < 0)
+ break;
+ vpd->busy = true;
+ vpd->flag = PCI_VPD_ADDR_F;
+ ret = pci_vpd_pci22_wait(dev);
+ if (ret < 0)
+ break;
+
+ ret = pci_user_read_config_dword(dev, vpd->cap + PCI_VPD_DATA, &val);
+ if (ret < 0)
+ break;
+
+ skip = pos & 3;
+ for (i = 0; i < sizeof(u32); i++) {
+ if (i >= skip) {
+ *buf++ = val;
+ if (++pos == end)
+ break;
+ }
+ val >>= 8;
+ }
}
- return end - begin;
+out:
+ mutex_unlock(&vpd->lock);
+ return ret ? ret : count;
}
-static int pci_vpd_pci22_write(struct pci_dev *dev, int pos, int size,
- const char *buf)
+static ssize_t pci_vpd_pci22_write(struct pci_dev *dev, loff_t pos, size_t count,
+ const void *arg)
{
struct pci_vpd_pci22 *vpd =
container_of(dev->vpd, struct pci_vpd_pci22, base);
- u32 val;
- int ret;
+ const u8 *buf = arg;
+ loff_t end = pos + count;
+ int ret = 0;
- if (pos < 0 || pos > vpd->base.len || pos & 3 ||
- size > vpd->base.len - pos || size < 4)
+ if (pos < 0 || (pos & 3) || (count & 3) || end > vpd->base.len)
return -EINVAL;
- val = (u8) *buf++;
- val |= ((u8) *buf++) << 8;
- val |= ((u8) *buf++) << 16;
- val |= ((u32)(u8) *buf++) << 24;
+ if (mutex_lock_killable(&vpd->lock))
+ return -EINTR;
- spin_lock_irq(&vpd->lock);
ret = pci_vpd_pci22_wait(dev);
if (ret < 0)
goto out;
- ret = pci_user_write_config_dword(dev, vpd->cap + PCI_VPD_DATA,
- val);
- if (ret < 0)
- goto out;
- ret = pci_user_write_config_word(dev, vpd->cap + PCI_VPD_ADDR,
- pos | PCI_VPD_ADDR_F);
- if (ret < 0)
- goto out;
- vpd->busy = true;
- vpd->flag = 0;
- ret = pci_vpd_pci22_wait(dev);
-out:
- spin_unlock_irq(&vpd->lock);
- if (ret < 0)
- return ret;
- return 4;
+ while (pos < end) {
+ u32 val;
+
+ val = *buf++;
+ val |= *buf++ << 8;
+ val |= *buf++ << 16;
+ val |= *buf++ << 24;
+
+ ret = pci_user_write_config_dword(dev, vpd->cap + PCI_VPD_DATA, val);
+ if (ret < 0)
+ break;
+ ret = pci_user_write_config_word(dev, vpd->cap + PCI_VPD_ADDR,
+ pos | PCI_VPD_ADDR_F);
+ if (ret < 0)
+ break;
+
+ vpd->busy = true;
+ vpd->flag = 0;
+ ret = pci_vpd_pci22_wait(dev);
+
+ pos += sizeof(u32);
+ }
+out:
+ mutex_unlock(&vpd->lock);
+ return ret ? ret : count;
}
static void pci_vpd_pci22_release(struct pci_dev *dev)
kfree(container_of(dev->vpd, struct pci_vpd_pci22, base));
}
-static struct pci_vpd_ops pci_vpd_pci22_ops = {
+static const struct pci_vpd_ops pci_vpd_pci22_ops = {
.read = pci_vpd_pci22_read,
.write = pci_vpd_pci22_write,
.release = pci_vpd_pci22_release,
vpd->base.len = PCI_VPD_PCI22_SIZE;
vpd->base.ops = &pci_vpd_pci22_ops;
- spin_lock_init(&vpd->lock);
+ mutex_init(&vpd->lock);
vpd->cap = cap;
vpd->busy = false;
dev->vpd = &vpd->base;
}
/**
+ * pci_vpd_truncate - Set available Vital Product Data size
+ * @dev: pci device struct
+ * @size: available memory in bytes
+ *
+ * Adjust size of available VPD area.
+ */
+int pci_vpd_truncate(struct pci_dev *dev, size_t size)
+{
+ if (!dev->vpd)
+ return -EINVAL;
+
+ /* limited by the access method */
+ if (size > dev->vpd->len)
+ return -EINVAL;
+
+ dev->vpd->len = size;
+ if (dev->vpd->attr)
+ dev->vpd->attr->size = size;
+
+ return 0;
+}
+EXPORT_SYMBOL(pci_vpd_truncate);
+
+/**
* pci_block_user_cfg_access - Block userspace PCI config reads/writes
* @dev: pci device struct
*
unsigned long flags;
int was_blocked;
- spin_lock_irqsave(&pci_lock, flags);
+ raw_spin_lock_irqsave(&pci_lock, flags);
was_blocked = dev->block_ucfg_access;
dev->block_ucfg_access = 1;
- spin_unlock_irqrestore(&pci_lock, flags);
+ raw_spin_unlock_irqrestore(&pci_lock, flags);
/* If we BUG() inside the pci_lock, we're guaranteed to hose
* the machine */
{
unsigned long flags;
- spin_lock_irqsave(&pci_lock, flags);
+ raw_spin_lock_irqsave(&pci_lock, flags);
/* This indicates a problem in the caller, but we don't need
* to kill them, unlike a double-block above. */
dev->block_ucfg_access = 0;
wake_up_all(&pci_ucfg_wait);
- spin_unlock_irqrestore(&pci_lock, flags);
+ raw_spin_unlock_irqrestore(&pci_lock, flags);
}
EXPORT_SYMBOL_GPL(pci_unblock_user_cfg_access);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff