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-rw-r--r--drivers/misc/hpilo.c138
-rw-r--r--drivers/misc/hpilo.h8
2 files changed, 101 insertions, 45 deletions
diff --git a/drivers/misc/hpilo.c b/drivers/misc/hpilo.c
index 35ed12379cd..9a370d5acf8 100644
--- a/drivers/misc/hpilo.c
+++ b/drivers/misc/hpilo.c
@@ -13,6 +13,7 @@
#include <linux/module.h>
#include <linux/fs.h>
#include <linux/pci.h>
+#include <linux/interrupt.h>
#include <linux/ioport.h>
#include <linux/device.h>
#include <linux/file.h>
@@ -21,6 +22,7 @@
#include <linux/delay.h>
#include <linux/uaccess.h>
#include <linux/io.h>
+#include <linux/wait.h>
#include "hpilo.h"
static struct class *ilo_class;
@@ -61,9 +63,10 @@ static inline int desc_mem_sz(int nr_entry)
static int fifo_enqueue(struct ilo_hwinfo *hw, char *fifobar, int entry)
{
struct fifo *fifo_q = FIFOBARTOHANDLE(fifobar);
+ unsigned long flags;
int ret = 0;
- spin_lock(&hw->fifo_lock);
+ spin_lock_irqsave(&hw->fifo_lock, flags);
if (!(fifo_q->fifobar[(fifo_q->tail + 1) & fifo_q->imask]
& ENTRY_MASK_O)) {
fifo_q->fifobar[fifo_q->tail & fifo_q->imask] |=
@@ -71,7 +74,7 @@ static int fifo_enqueue(struct ilo_hwinfo *hw, char *fifobar, int entry)
fifo_q->tail += 1;
ret = 1;
}
- spin_unlock(&hw->fifo_lock);
+ spin_unlock_irqrestore(&hw->fifo_lock, flags);
return ret;
}
@@ -79,10 +82,11 @@ static int fifo_enqueue(struct ilo_hwinfo *hw, char *fifobar, int entry)
static int fifo_dequeue(struct ilo_hwinfo *hw, char *fifobar, int *entry)
{
struct fifo *fifo_q = FIFOBARTOHANDLE(fifobar);
+ unsigned long flags;
int ret = 0;
u64 c;
- spin_lock(&hw->fifo_lock);
+ spin_lock_irqsave(&hw->fifo_lock, flags);
c = fifo_q->fifobar[fifo_q->head & fifo_q->imask];
if (c & ENTRY_MASK_C) {
if (entry)
@@ -93,7 +97,7 @@ static int fifo_dequeue(struct ilo_hwinfo *hw, char *fifobar, int *entry)
fifo_q->head += 1;
ret = 1;
}
- spin_unlock(&hw->fifo_lock);
+ spin_unlock_irqrestore(&hw->fifo_lock, flags);
return ret;
}
@@ -374,7 +378,18 @@ static inline void clear_device(struct ilo_hwinfo *hw)
clear_pending_db(hw, -1);
}
-static void ilo_locked_reset(struct ilo_hwinfo *hw)
+static inline void ilo_enable_interrupts(struct ilo_hwinfo *hw)
+{
+ iowrite8(ioread8(&hw->mmio_vaddr[DB_IRQ]) | 1, &hw->mmio_vaddr[DB_IRQ]);
+}
+
+static inline void ilo_disable_interrupts(struct ilo_hwinfo *hw)
+{
+ iowrite8(ioread8(&hw->mmio_vaddr[DB_IRQ]) & ~1,
+ &hw->mmio_vaddr[DB_IRQ]);
+}
+
+static void ilo_set_reset(struct ilo_hwinfo *hw)
{
int slot;
@@ -387,19 +402,6 @@ static void ilo_locked_reset(struct ilo_hwinfo *hw)
continue;
set_channel_reset(&hw->ccb_alloc[slot]->driver_ccb);
}
-
- clear_device(hw);
-}
-
-static void ilo_reset(struct ilo_hwinfo *hw)
-{
- spin_lock(&hw->alloc_lock);
-
- /* reset might have been handled after lock was taken */
- if (is_device_reset(hw))
- ilo_locked_reset(hw);
-
- spin_unlock(&hw->alloc_lock);
}
static ssize_t ilo_read(struct file *fp, char __user *buf,
@@ -411,12 +413,11 @@ static ssize_t ilo_read(struct file *fp, char __user *buf,
struct ilo_hwinfo *hw = data->ilo_hw;
void *pkt;
- if (is_device_reset(hw) || is_channel_reset(driver_ccb)) {
+ if (is_channel_reset(driver_ccb)) {
/*
* If the device has been reset, applications
* need to close and reopen all ccbs.
*/
- ilo_reset(hw);
return -ENODEV;
}
@@ -462,14 +463,8 @@ static ssize_t ilo_write(struct file *fp, const char __user *buf,
struct ilo_hwinfo *hw = data->ilo_hw;
void *pkt;
- if (is_device_reset(hw) || is_channel_reset(driver_ccb)) {
- /*
- * If the device has been reset, applications
- * need to close and reopen all ccbs.
- */
- ilo_reset(hw);
+ if (is_channel_reset(driver_ccb))
return -ENODEV;
- }
/* get a packet to send the user command */
if (!ilo_pkt_dequeue(hw, driver_ccb, SENDQ, &pkt_id, &pkt_len, &pkt))
@@ -496,27 +491,28 @@ static int ilo_close(struct inode *ip, struct file *fp)
int slot;
struct ccb_data *data;
struct ilo_hwinfo *hw;
+ unsigned long flags;
slot = iminor(ip) % MAX_CCB;
hw = container_of(ip->i_cdev, struct ilo_hwinfo, cdev);
- spin_lock(&hw->alloc_lock);
-
- if (is_device_reset(hw))
- ilo_locked_reset(hw);
+ spin_lock(&hw->open_lock);
if (hw->ccb_alloc[slot]->ccb_cnt == 1) {
data = fp->private_data;
+ spin_lock_irqsave(&hw->alloc_lock, flags);
+ hw->ccb_alloc[slot] = NULL;
+ spin_unlock_irqrestore(&hw->alloc_lock, flags);
+
ilo_ccb_close(hw->ilo_dev, data);
kfree(data);
- hw->ccb_alloc[slot] = NULL;
} else
hw->ccb_alloc[slot]->ccb_cnt--;
- spin_unlock(&hw->alloc_lock);
+ spin_unlock(&hw->open_lock);
return 0;
}
@@ -526,6 +522,7 @@ static int ilo_open(struct inode *ip, struct file *fp)
int slot, error;
struct ccb_data *data;
struct ilo_hwinfo *hw;
+ unsigned long flags;
slot = iminor(ip) % MAX_CCB;
hw = container_of(ip->i_cdev, struct ilo_hwinfo, cdev);
@@ -535,10 +532,7 @@ static int ilo_open(struct inode *ip, struct file *fp)
if (!data)
return -ENOMEM;
- spin_lock(&hw->alloc_lock);
-
- if (is_device_reset(hw))
- ilo_locked_reset(hw);
+ spin_lock(&hw->open_lock);
/* each fd private_data holds sw/hw view of ccb */
if (hw->ccb_alloc[slot] == NULL) {
@@ -549,22 +543,31 @@ static int ilo_open(struct inode *ip, struct file *fp)
goto out;
}
+ data->ccb_cnt = 1;
+ data->ccb_excl = fp->f_flags & O_EXCL;
+ data->ilo_hw = hw;
+ init_waitqueue_head(&data->ccb_waitq);
+
/* write the ccb to hw */
+ spin_lock_irqsave(&hw->alloc_lock, flags);
ilo_ccb_open(hw, data, slot);
+ hw->ccb_alloc[slot] = data;
+ spin_unlock_irqrestore(&hw->alloc_lock, flags);
/* make sure the channel is functional */
error = ilo_ccb_verify(hw, data);
if (error) {
+
+ spin_lock_irqsave(&hw->alloc_lock, flags);
+ hw->ccb_alloc[slot] = NULL;
+ spin_unlock_irqrestore(&hw->alloc_lock, flags);
+
ilo_ccb_close(hw->ilo_dev, data);
+
kfree(data);
goto out;
}
- data->ccb_cnt = 1;
- data->ccb_excl = fp->f_flags & O_EXCL;
- data->ilo_hw = hw;
- hw->ccb_alloc[slot] = data;
-
} else {
kfree(data);
if (fp->f_flags & O_EXCL || hw->ccb_alloc[slot]->ccb_excl) {
@@ -580,7 +583,7 @@ static int ilo_open(struct inode *ip, struct file *fp)
}
}
out:
- spin_unlock(&hw->alloc_lock);
+ spin_unlock(&hw->open_lock);
if (!error)
fp->private_data = hw->ccb_alloc[slot];
@@ -596,6 +599,41 @@ static const struct file_operations ilo_fops = {
.release = ilo_close,
};
+static irqreturn_t ilo_isr(int irq, void *data)
+{
+ struct ilo_hwinfo *hw = data;
+ int pending, i;
+
+ spin_lock(&hw->alloc_lock);
+
+ /* check for ccbs which have data */
+ pending = get_device_outbound(hw);
+ if (!pending) {
+ spin_unlock(&hw->alloc_lock);
+ return IRQ_NONE;
+ }
+
+ if (is_db_reset(pending)) {
+ /* wake up all ccbs if the device was reset */
+ pending = -1;
+ ilo_set_reset(hw);
+ }
+
+ for (i = 0; i < MAX_CCB; i++) {
+ if (!hw->ccb_alloc[i])
+ continue;
+ if (pending & (1 << i))
+ wake_up_interruptible(&hw->ccb_alloc[i]->ccb_waitq);
+ }
+
+ /* clear the device of the channels that have been handled */
+ clear_pending_db(hw, pending);
+
+ spin_unlock(&hw->alloc_lock);
+
+ return IRQ_HANDLED;
+}
+
static void ilo_unmap_device(struct pci_dev *pdev, struct ilo_hwinfo *hw)
{
pci_iounmap(pdev, hw->db_vaddr);
@@ -649,6 +687,8 @@ static void ilo_remove(struct pci_dev *pdev)
device_destroy(ilo_class, MKDEV(ilo_major, i));
cdev_del(&ilo_hw->cdev);
+ ilo_disable_interrupts(ilo_hw);
+ free_irq(pdev->irq, ilo_hw);
ilo_unmap_device(pdev, ilo_hw);
pci_release_regions(pdev);
pci_disable_device(pdev);
@@ -684,6 +724,7 @@ static int __devinit ilo_probe(struct pci_dev *pdev,
ilo_hw->ilo_dev = pdev;
spin_lock_init(&ilo_hw->alloc_lock);
spin_lock_init(&ilo_hw->fifo_lock);
+ spin_lock_init(&ilo_hw->open_lock);
error = pci_enable_device(pdev);
if (error)
@@ -702,13 +743,19 @@ static int __devinit ilo_probe(struct pci_dev *pdev,
pci_set_drvdata(pdev, ilo_hw);
clear_device(ilo_hw);
+ error = request_irq(pdev->irq, ilo_isr, IRQF_SHARED, "hpilo", ilo_hw);
+ if (error)
+ goto unmap;
+
+ ilo_enable_interrupts(ilo_hw);
+
cdev_init(&ilo_hw->cdev, &ilo_fops);
ilo_hw->cdev.owner = THIS_MODULE;
start = devnum * MAX_CCB;
error = cdev_add(&ilo_hw->cdev, MKDEV(ilo_major, start), MAX_CCB);
if (error) {
dev_err(&pdev->dev, "Could not add cdev\n");
- goto unmap;
+ goto remove_isr;
}
for (minor = 0 ; minor < MAX_CCB; minor++) {
@@ -721,6 +768,9 @@ static int __devinit ilo_probe(struct pci_dev *pdev,
}
return 0;
+remove_isr:
+ ilo_disable_interrupts(ilo_hw);
+ free_irq(pdev->irq, ilo_hw);
unmap:
ilo_unmap_device(pdev, ilo_hw);
free_regions:
diff --git a/drivers/misc/hpilo.h b/drivers/misc/hpilo.h
index 03a14c82aad..38576050776 100644
--- a/drivers/misc/hpilo.h
+++ b/drivers/misc/hpilo.h
@@ -46,11 +46,14 @@ struct ilo_hwinfo {
spinlock_t alloc_lock;
spinlock_t fifo_lock;
+ spinlock_t open_lock;
struct cdev cdev;
};
-/* offset from mmio_vaddr */
+/* offset from mmio_vaddr for enabling doorbell interrupts */
+#define DB_IRQ 0xB2
+/* offset from mmio_vaddr for outbound communications */
#define DB_OUT 0xD4
/* DB_OUT reset bit */
#define DB_RESET 26
@@ -131,6 +134,9 @@ struct ccb_data {
/* pointer to hardware device info */
struct ilo_hwinfo *ilo_hw;
+ /* queue for this ccb to wait for recv data */
+ wait_queue_head_t ccb_waitq;
+
/* usage count, to allow for shared ccb's */
int ccb_cnt;
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-02 02:30:18 +0000