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Subject[PATCH][resubmit] HP iLO driver
A driver for the HP iLO/iLO2 management processor, which allows userspace
programs to query the management processor. Programs can open a channel
to the device (/dev/hpilo/dXccbN), and use this to send/receive queries.
The O_EXCL open flag is used to indicate that a particular channel cannot
be shared between processes. This driver will replace various packages
HP has shipped, including hprsm and hp-ilo.

v2 -> v3
Moved code from drivers/char to drivers/misc

v1 -> v2
Changed device path to /dev/hpilo/dXccbN.
Removed a volatile from fifobar variable.
Changed ILO_NAME to remove spaces.

Please CC me on any replies, thanks for your time.

Signed-off-by: David Altobelli <david.altobelli@hp.com>
---
Kconfig | 13 +
Makefile | 1
hpilo.c | 695 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
hpilo.h | 218 +++++++++++++++++++
4 files changed, 927 insertions(+)
diff -urpN linux-2.6.26-rc7.orig/drivers/misc/hpilo.c linux-2.6.26-rc7/drivers/misc/hpilo.c
--- linux-2.6.26-rc7.orig/drivers/misc/hpilo.c 1969-12-31 18:00:00.000000000 -0600
+++ linux-2.6.26-rc7/drivers/misc/hpilo.c 2008-06-23 08:52:25.000000000 -0500
@@ -0,0 +1,695 @@
+/*
+ * Driver for HP iLO/iLO2 management processor.
+ *
+ * Copyright (C) 2008 Hewlett-Packard Development Company, L.P.
+ * David Altobelli <david.altobelli@hp.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#include <linux/kernel.h>
+#include <linux/types.h>
+#include <linux/module.h>
+#include <linux/fs.h>
+#include <linux/pci.h>
+#include <linux/ioport.h>
+#include <linux/device.h>
+#include <linux/file.h>
+#include <linux/cdev.h>
+#include <linux/spinlock.h>
+#include <linux/delay.h>
+#include <linux/uaccess.h>
+#include <linux/io.h>
+#include "hpilo.h"
+
+static struct class *ilo_class;
+static unsigned int ilo_major;
+static char ilo_hwdev[MAX_ILO_DEV];
+
+/*
+ * FIFO queues, shared with hardware.
+ *
+ * If a queue has empty slots, an entry is added to the queue tail,
+ * and that entry is marked as occupied.
+ * Entries can be dequeued from the head of the list, when the device
+ * has marked the entry as consumed.
+ *
+ * Returns true on successful queue/dequeue, false on failure.
+ */
+static int fifo_enqueue(struct ilo_hwinfo *hw, char *fifobar, int entry)
+{
+ struct fifo *Q = FIFOBARTOHANDLE(fifobar);
+ int ret = 0;
+
+ spin_lock(&hw->fifo_lock);
+ if (!(Q->fifobar[(Q->tail + 1) & Q->imask] & ENTRY_MASK_O)) {
+ Q->fifobar[Q->tail & Q->imask] |=
+ ((entry & ENTRY_MASK_NOSTATE) | Q->merge);
+ Q->tail += 1;
+ ret = 1;
+ }
+ spin_unlock(&hw->fifo_lock);
+
+ return ret;
+}
+
+static int fifo_dequeue(struct ilo_hwinfo *hw, char *fifobar, int *entry)
+{
+ struct fifo *Q = FIFOBARTOHANDLE(fifobar);
+ int ret = 0;
+ u64 c;
+
+ spin_lock(&hw->fifo_lock);
+ c = Q->fifobar[Q->head & Q->imask];
+ if (c & ENTRY_MASK_C) {
+ if (entry)
+ *entry = c & ENTRY_MASK_NOSTATE;
+
+ Q->fifobar[Q->head & Q->imask] = ((c | ENTRY_MASK) + 1);
+ Q->head += 1;
+ ret = 1;
+ }
+ spin_unlock(&hw->fifo_lock);
+
+ return ret;
+}
+
+static int ilo_pkt_enqueue(struct ilo_hwinfo *hw, struct ccb *ccb,
+ int dir, int id, int len)
+{
+ char *fifobar;
+ int entry;
+
+ if (dir == SENDQ)
+ fifobar = ccb->ccb_u1.send_fifobar;
+ else
+ fifobar = ccb->ccb_u3.recv_fifobar;
+
+ entry = id << ENTRY_BITPOS_DESCRIPTOR |
+ QWORDS(len) << ENTRY_BITPOS_QWORDS;
+
+ return fifo_enqueue(hw, fifobar, entry);
+}
+
+static int ilo_pkt_dequeue(struct ilo_hwinfo *hw, struct ccb *ccb,
+ int dir, int *id, int *len, void **pkt)
+{
+ char *fifobar, *desc;
+ int entry = 0, pkt_id = 0;
+ int ret;
+
+ if (dir == SENDQ) {
+ fifobar = ccb->ccb_u1.send_fifobar;
+ desc = ccb->ccb_u2.send_desc;
+ } else {
+ fifobar = ccb->ccb_u3.recv_fifobar;
+ desc = ccb->ccb_u4.recv_desc;
+ }
+
+ ret = fifo_dequeue(hw, fifobar, &entry);
+ if (ret) {
+ pkt_id = GETDESC(entry);
+ if (id)
+ *id = pkt_id;
+ if (len)
+ *len = GETQWORDS(entry) << 3;
+ if (pkt)
+ *pkt = (void *)(desc + DESC_MEM_SZ(pkt_id));
+ }
+
+ return ret;
+}
+
+static void ctrl_setup(struct ccb *ccb, int nr_desc, int l2desc_sz)
+{
+ /* for simplicity, use the same parameters for send and recv ctrls */
+ CTRL_SET(ccb->send_ctrl, l2desc_sz, nr_desc-1, nr_desc-1, 0, 1);
+ CTRL_SET(ccb->recv_ctrl, l2desc_sz, nr_desc-1, nr_desc-1, 0, 1);
+}
+
+static void fifo_setup(void *base_addr, int nr_entry)
+{
+ struct fifo *Q = base_addr;
+ int i;
+
+ /* set up an empty fifo */
+ Q->head = 0;
+ Q->tail = 0;
+ Q->reset = 0;
+ Q->nrents = nr_entry;
+ Q->imask = nr_entry - 1;
+ Q->merge = ENTRY_MASK_O;
+
+ for (i = 0; i < nr_entry; i++)
+ Q->fifobar[i] = 0;
+}
+
+static void ilo_ccb_close(struct pci_dev *pdev, struct ccb_data *data)
+{
+ struct ccb *driver_ccb;
+ struct ccb __iomem *device_ccb;
+ int retries;
+
+ driver_ccb = &data->driver_ccb;
+ device_ccb = data->mapped_ccb;
+
+ /* complicated dance to tell the hw we are stopping */
+ DOORBELL_CLR(driver_ccb);
+ iowrite32(ioread32(&device_ccb->send_ctrl) & ~(1 << CTRL_BITPOS_G),
+ &device_ccb->send_ctrl);
+ iowrite32(ioread32(&device_ccb->recv_ctrl) & ~(1 << CTRL_BITPOS_G),
+ &device_ccb->recv_ctrl);
+
+ /* give iLO some time to process stop request */
+ for (retries = 1000; retries > 0; retries--) {
+ DOORBELL_SET(driver_ccb);
+ udelay(1);
+ if (!(ioread32(&device_ccb->send_ctrl) & (1 << CTRL_BITPOS_A))
+ &&
+ !(ioread32(&device_ccb->recv_ctrl) & (1 << CTRL_BITPOS_A)))
+ break;
+ }
+ if (retries == 0)
+ dev_err(&pdev->dev, "Closing, but controller still active\n");
+
+ /* clear the hw ccb */
+ memset_io(device_ccb, 0, sizeof(struct ccb));
+
+ /* free resources used to back send/recv queues */
+ pci_free_consistent(pdev, data->dma_size, data->dma_va, data->dma_pa);
+}
+
+static int ilo_ccb_open(struct ilo_hwinfo *hw, struct ccb_data *data, int slot)
+{
+ char *dma_va, *dma_pa;
+ int pkt_id, pkt_sz, i, error;
+ struct ccb *driver_ccb, *ilo_ccb;
+ struct pci_dev *pdev;
+
+ driver_ccb = &data->driver_ccb;
+ ilo_ccb = &data->ilo_ccb;
+ pdev = hw->ilo_dev;
+
+ data->dma_size = 2 * FIFO_SZ(NR_QENTRY) +
+ 2 * DESC_MEM_SZ(NR_QENTRY) +
+ ILO_START_ALIGN + ILO_CACHE_SZ;
+
+ error = -ENOMEM;
+ data->dma_va = pci_alloc_consistent(pdev, data->dma_size,
+ &data->dma_pa);
+ if (!data->dma_va)
+ goto out;
+
+ dma_va = (char *)data->dma_va;
+ dma_pa = (char *)data->dma_pa;
+
+ memset(dma_va, 0, data->dma_size);
+
+ dma_va = (char *)roundup((unsigned long)dma_va, ILO_START_ALIGN);
+ dma_pa = (char *)roundup((unsigned long)dma_pa, ILO_START_ALIGN);
+
+ /*
+ * Create two ccb's, one with virt addrs, one with phys addrs.
+ * Copy the phys addr ccb to device shared mem.
+ */
+ ctrl_setup(driver_ccb, NR_QENTRY, L2_QENTRY_SZ);
+ ctrl_setup(ilo_ccb, NR_QENTRY, L2_QENTRY_SZ);
+
+ fifo_setup(dma_va, NR_QENTRY);
+ driver_ccb->ccb_u1.send_fifobar = (dma_va + FIFOHANDLESIZE);
+ ilo_ccb->ccb_u1.send_fifobar = (dma_pa + FIFOHANDLESIZE);
+ dma_va += FIFO_SZ(NR_QENTRY);
+ dma_pa += FIFO_SZ(NR_QENTRY);
+
+ dma_va = (char *)roundup((unsigned long)dma_va, ILO_CACHE_SZ);
+ dma_pa = (char *)roundup((unsigned long)dma_pa, ILO_CACHE_SZ);
+
+ fifo_setup(dma_va, NR_QENTRY);
+ driver_ccb->ccb_u3.recv_fifobar = (dma_va + FIFOHANDLESIZE);
+ ilo_ccb->ccb_u3.recv_fifobar = (dma_pa + FIFOHANDLESIZE);
+ dma_va += FIFO_SZ(NR_QENTRY);
+ dma_pa += FIFO_SZ(NR_QENTRY);
+
+ driver_ccb->ccb_u2.send_desc = dma_va;
+ ilo_ccb->ccb_u2.send_desc = dma_pa;
+ dma_pa += DESC_MEM_SZ(NR_QENTRY);
+ dma_va += DESC_MEM_SZ(NR_QENTRY);
+
+ driver_ccb->ccb_u4.recv_desc = dma_va;
+ ilo_ccb->ccb_u4.recv_desc = dma_pa;
+
+ driver_ccb->channel = slot;
+ ilo_ccb->channel = slot;
+
+ driver_ccb->ccb_u5.db_base = hw->db_vaddr + (slot << L2_DB_SIZE);
+ ilo_ccb->ccb_u5.db_base = NULL; /* hw ccb's doorbell is not used */
+
+ /* copy the ccb with physical addrs to device memory */
+ data->mapped_ccb = (struct ccb __iomem *)
+ (hw->ram_vaddr + (slot * ILOHW_CCB_SZ));
+ memcpy_toio(data->mapped_ccb, ilo_ccb, sizeof(struct ccb));
+
+ /* put packets on the send and receive queues */
+ pkt_sz = 0;
+ for (pkt_id = 0; pkt_id < NR_QENTRY; pkt_id++) {
+ ilo_pkt_enqueue(hw, driver_ccb, SENDQ, pkt_id, pkt_sz);
+ DOORBELL_SET(driver_ccb);
+ }
+
+ pkt_sz = DESC_MEM_SZ(1);
+ for (pkt_id = 0; pkt_id < NR_QENTRY; pkt_id++)
+ ilo_pkt_enqueue(hw, driver_ccb, RECVQ, pkt_id, pkt_sz);
+
+ DOORBELL_CLR(driver_ccb);
+
+ /* make sure iLO is really handling requests */
+ for (i = 1000; i > 0; i--) {
+ if (ilo_pkt_dequeue(hw, driver_ccb, SENDQ, &pkt_id, NULL, NULL))
+ break;
+ udelay(1);
+ }
+
+ if (i) {
+ ilo_pkt_enqueue(hw, driver_ccb, SENDQ, pkt_id, 0);
+ DOORBELL_SET(driver_ccb);
+ } else {
+ dev_err(&pdev->dev, "Open could not dequeue a packet\n");
+ error = -EBUSY;
+ goto free;
+ }
+
+ return 0;
+free:
+ pci_free_consistent(pdev, data->dma_size, data->dma_va, data->dma_pa);
+out:
+ return error;
+}
+
+static void ilo_locked_reset(struct ilo_hwinfo *hw)
+{
+ int slot;
+
+ /*
+ * Mapped memory is zeroed on ilo reset, so set a per ccb flag
+ * to indicate that this ccb needs to be closed and reopened.
+ */
+ for (slot = 0; slot < MAX_CCB; slot++) {
+ if (!hw->ccb_alloc[slot])
+ 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,
+ size_t len, loff_t *off)
+{
+ int err, found, cnt, pkt_id, pkt_len;
+ struct ccb_data *data;
+ struct ccb *driver_ccb;
+ struct ilo_hwinfo *hw;
+ void *pkt;
+
+ data = fp->private_data;
+ driver_ccb = &data->driver_ccb;
+ hw = data->ilo_hw;
+
+ 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);
+ return -ENODEV;
+ }
+
+ /*
+ * This function is to be called when data is expected
+ * in the channel, and will return an error if no packet is found
+ * during the loop below. The sleep/retry logic is to allow
+ * applications to call read() immediately post write(),
+ * and give iLO some time to process the sent packet.
+ */
+ cnt = 20;
+ do {
+ /* look for a received packet */
+ found = ilo_pkt_dequeue(hw, driver_ccb, RECVQ, &pkt_id,
+ &pkt_len, &pkt);
+ if (found)
+ break;
+ cnt--;
+ msleep(100);
+ } while (!found && cnt);
+
+ if (!found)
+ return -EAGAIN;
+
+ /* only copy the length of the received packet */
+ if (pkt_len < len)
+ len = pkt_len;
+
+ err = copy_to_user(buf, pkt, len);
+
+ /* return the received packet to the queue */
+ ilo_pkt_enqueue(hw, driver_ccb, RECVQ, pkt_id, DESC_MEM_SZ(1));
+
+ return err ? -EFAULT : len;
+}
+
+static ssize_t ilo_write(struct file *fp, const char __user *buf,
+ size_t len, loff_t *off)
+{
+ int err, pkt_id, pkt_len;
+ struct ccb_data *data;
+ struct ccb *driver_ccb;
+ struct ilo_hwinfo *hw;
+ void *pkt;
+
+ data = fp->private_data;
+ driver_ccb = &data->driver_ccb;
+ hw = data->ilo_hw;
+
+ 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);
+ return -ENODEV;
+ }
+
+ /* get a packet to send the user command */
+ if (!ilo_pkt_dequeue(hw, driver_ccb, SENDQ, &pkt_id, &pkt_len, &pkt))
+ return -EBUSY;
+
+ /* limit the length to the length of the packet */
+ if (pkt_len < len)
+ len = pkt_len;
+
+ /* on failure, set the len to 0 to return empty packet to the device */
+ err = copy_from_user(pkt, buf, len);
+ if (err)
+ len = 0;
+
+ /* send the packet */
+ ilo_pkt_enqueue(hw, driver_ccb, SENDQ, pkt_id, len);
+ DOORBELL_SET(driver_ccb);
+
+ return err ? -EFAULT : len;
+}
+
+static int ilo_close(struct inode *ip, struct file *fp)
+{
+ int slot;
+ struct ccb_data *data;
+ struct ilo_hwinfo *hw;
+
+ 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);
+
+ if (hw->ccb_alloc[slot]->ccb_cnt == 1) {
+
+ data = fp->private_data;
+
+ 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);
+
+ return 0;
+}
+
+static int ilo_open(struct inode *ip, struct file *fp)
+{
+ int slot, error;
+ struct ccb_data *data;
+ struct ilo_hwinfo *hw;
+
+ 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);
+
+ /* each fd private_data holds sw/hw view of ccb */
+ if (hw->ccb_alloc[slot] == NULL) {
+ /* new ccb allocation */
+ error = -ENOMEM;
+ data = kzalloc(sizeof(struct ccb_data), GFP_KERNEL);
+ if (!data)
+ goto out;
+
+ /* create a channel control block for this minor */
+ error = ilo_ccb_open(hw, data, slot);
+ if (error)
+ goto free;
+
+ hw->ccb_alloc[slot] = data;
+ hw->ccb_alloc[slot]->ccb_cnt = 1;
+ hw->ccb_alloc[slot]->ccb_excl = fp->f_flags & O_EXCL;
+ hw->ccb_alloc[slot]->ilo_hw = hw;
+ } else if (fp->f_flags & O_EXCL || hw->ccb_alloc[slot]->ccb_excl) {
+ /* either this open or a previous open wants exclusive access */
+ error = -EBUSY;
+ goto out;
+ } else
+ hw->ccb_alloc[slot]->ccb_cnt++;
+
+ spin_unlock(&hw->alloc_lock);
+
+ fp->private_data = hw->ccb_alloc[slot];
+
+ return 0;
+free:
+ kfree(data);
+out:
+ spin_unlock(&hw->alloc_lock);
+ return error;
+}
+
+static const struct file_operations ilo_fops = {
+ THIS_MODULE,
+ .read = ilo_read,
+ .write = ilo_write,
+ .open = ilo_open,
+ .release = ilo_close,
+};
+
+static void ilo_unmap_device(struct pci_dev *pdev, struct ilo_hwinfo *hw)
+{
+ pci_iounmap(pdev, hw->db_vaddr);
+ pci_iounmap(pdev, hw->ram_vaddr);
+ pci_iounmap(pdev, hw->mmio_vaddr);
+}
+
+static int __devinit ilo_map_device(struct pci_dev *pdev, struct ilo_hwinfo *hw)
+{
+ int error = -ENOMEM;
+
+ /* map the memory mapped i/o registers */
+ hw->mmio_vaddr = pci_iomap(pdev, 1, 0);
+ if (hw->mmio_vaddr == NULL) {
+ dev_err(&pdev->dev, "Error mapping mmio\n");
+ goto out;
+ }
+
+ /* map the adapter shared memory region */
+ hw->ram_vaddr = pci_iomap(pdev, 2, MAX_CCB * ILOHW_CCB_SZ);
+ if (hw->ram_vaddr == NULL) {
+ dev_err(&pdev->dev, "Error mapping shared mem\n");
+ goto mmio_free;
+ }
+
+ /* map the doorbell aperture */
+ hw->db_vaddr = pci_iomap(pdev, 3, MAX_CCB * ONE_DB_SIZE);
+ if (hw->db_vaddr == NULL) {
+ dev_err(&pdev->dev, "Error mapping doorbell\n");
+ goto ram_free;
+ }
+
+ return 0;
+ram_free:
+ pci_iounmap(pdev, hw->ram_vaddr);
+mmio_free:
+ pci_iounmap(pdev, hw->mmio_vaddr);
+out:
+ return error;
+}
+
+static void ilo_remove(struct pci_dev *pdev)
+{
+ int i, minor;
+ struct ilo_hwinfo *ilo_hw = pci_get_drvdata(pdev);
+
+ CLEAR_DEVICE(ilo_hw);
+
+ minor = MINOR(ilo_hw->cdev.dev);
+ for (i = minor; i < minor + MAX_CCB; i++)
+ device_destroy(ilo_class, MKDEV(ilo_major, i));
+
+ cdev_del(&ilo_hw->cdev);
+ ilo_unmap_device(pdev, ilo_hw);
+ pci_release_regions(pdev);
+ pci_disable_device(pdev);
+ kfree(ilo_hw);
+ ilo_hwdev[(minor / MAX_CCB)] = 0;
+}
+
+static int __devinit ilo_probe(struct pci_dev *pdev,
+ const struct pci_device_id *ent)
+{
+ int devnum, minor, start, error;
+ struct ilo_hwinfo *ilo_hw;
+
+ /* find a free range for device files */
+ for (devnum = 0; devnum < MAX_ILO_DEV; devnum++) {
+ if (ilo_hwdev[devnum] == 0) {
+ ilo_hwdev[devnum] = 1;
+ break;
+ }
+ }
+
+ if (devnum == MAX_ILO_DEV) {
+ dev_err(&pdev->dev, "Error finding free device\n");
+ return -ENODEV;
+ }
+
+ /* track global allocations for this device */
+ error = -ENOMEM;
+ ilo_hw = kzalloc(sizeof(struct ilo_hwinfo), GFP_KERNEL);
+ if (!ilo_hw)
+ goto out;
+
+ ilo_hw->ilo_dev = pdev;
+ spin_lock_init(&ilo_hw->alloc_lock);
+ spin_lock_init(&ilo_hw->fifo_lock);
+
+ error = pci_enable_device(pdev);
+ if (error)
+ goto free;
+
+ pci_set_master(pdev);
+
+ error = pci_request_regions(pdev, ILO_NAME);
+ if (error)
+ goto disable;
+
+ error = ilo_map_device(pdev, ilo_hw);
+ if (error)
+ goto free_regions;
+
+ pci_set_drvdata(pdev, ilo_hw);
+ CLEAR_DEVICE(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;
+ }
+
+ for (minor = 0 ; minor < MAX_CCB; minor++) {
+ if (IS_ERR(device_create(ilo_class, &pdev->dev,
+ MKDEV(ilo_major, minor),
+ "hpilo!d%dccb%d", devnum, minor)))
+ dev_err(&pdev->dev, "Could not create files\n");
+ }
+
+ return 0;
+unmap:
+ ilo_unmap_device(pdev, ilo_hw);
+free_regions:
+ pci_release_regions(pdev);
+disable:
+ pci_disable_device(pdev);
+free:
+ kfree(ilo_hw);
+out:
+ ilo_hwdev[devnum] = 0;
+ return error;
+}
+
+static struct pci_device_id ilo_devices[] = {
+ { PCI_DEVICE(PCI_VENDOR_ID_COMPAQ, 0xB204) },
+ { }
+};
+MODULE_DEVICE_TABLE(pci, ilo_devices);
+
+static struct pci_driver ilo_driver = {
+ .name = ILO_NAME,
+ .id_table = ilo_devices,
+ .probe = ilo_probe,
+ .remove = __devexit_p(ilo_remove),
+};
+
+static int __init ilo_init(void)
+{
+ int error;
+ dev_t dev;
+
+ ilo_class = class_create(THIS_MODULE, "iLO");
+ if (IS_ERR(ilo_class)) {
+ error = PTR_ERR(ilo_class);
+ goto out;
+ }
+
+ error = alloc_chrdev_region(&dev, 0, MAX_OPEN, ILO_NAME);
+ if (error)
+ goto class_destroy;
+
+ ilo_major = MAJOR(dev);
+
+ error = pci_register_driver(&ilo_driver);
+ if (error)
+ goto chr_remove;
+
+ return 0;
+chr_remove:
+ unregister_chrdev_region(dev, MAX_OPEN);
+class_destroy:
+ class_destroy(ilo_class);
+out:
+ return error;
+}
+
+static void __exit ilo_exit(void)
+{
+ pci_unregister_driver(&ilo_driver);
+ unregister_chrdev_region(MKDEV(ilo_major, 0), MAX_OPEN);
+ class_destroy(ilo_class);
+}
+
+MODULE_VERSION("0.03");
+MODULE_ALIAS(ILO_NAME);
+MODULE_DESCRIPTION(ILO_NAME);
+MODULE_AUTHOR("David Altobelli <david.altobelli@hp.com>");
+MODULE_LICENSE("GPL v2");
+
+module_init(ilo_init);
+module_exit(ilo_exit);
diff -urpN linux-2.6.26-rc7.orig/drivers/misc/hpilo.h linux-2.6.26-rc7/drivers/misc/hpilo.h
--- linux-2.6.26-rc7.orig/drivers/misc/hpilo.h 1969-12-31 18:00:00.000000000 -0600
+++ linux-2.6.26-rc7/drivers/misc/hpilo.h 2008-06-23 08:52:25.000000000 -0500
@@ -0,0 +1,218 @@
+/*
+ * linux/drivers/char/hpilo.h
+ *
+ * Copyright (C) 2008 Hewlett-Packard Development Company, L.P.
+ * David Altobelli <david.altobelli@hp.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ */
+#ifndef __HPILO_H
+#define __HPILO_H
+
+#define ILO_NAME "hpilo"
+
+/* max number of open channel control blocks per device, hw limited to 32 */
+#define MAX_CCB 8
+/* max number of supported devices */
+#define MAX_ILO_DEV 1
+/* max number of files */
+#define MAX_OPEN (MAX_CCB * MAX_ILO_DEV)
+
+/*
+ * Per device, used to track global memory allocations.
+ */
+struct ilo_hwinfo {
+ /* mmio registers on device */
+ char __iomem *mmio_vaddr;
+
+ /* doorbell registers on device */
+ char __iomem *db_vaddr;
+
+ /* shared memory on device used for channel control blocks */
+ char __iomem *ram_vaddr;
+
+ /* files corresponding to this device */
+ struct ccb_data *ccb_alloc[MAX_CCB];
+
+ struct pci_dev *ilo_dev;
+
+ spinlock_t alloc_lock;
+ spinlock_t fifo_lock;
+
+ struct cdev cdev;
+};
+
+/* offset from mmio_vaddr */
+#define DB_OUT 0xD4
+/* check for global reset condition */
+#define IS_DEVICE_RESET(hw) (ioread32(&(hw)->mmio_vaddr[DB_OUT]) & (1 << 26))
+/* clear the device (reset bits, pending channel entries) */
+#define CLEAR_DEVICE(hw) (iowrite32(-1, &(hw)->mmio_vaddr[DB_OUT]))
+
+/*
+ * Channel control block. Used to manage hardware queues.
+ * The format must match hw's version. The hw ccb is 128 bytes,
+ * but the context area shouldn't be touched by the driver.
+ */
+#define ILOSW_CCB_SZ 64
+#define ILOHW_CCB_SZ 128
+struct ccb {
+ union {
+ char *send_fifobar;
+ u64 padding1;
+ } ccb_u1;
+ union {
+ char *send_desc;
+ u64 padding2;
+ } ccb_u2;
+ u64 send_ctrl;
+
+ union {
+ char *recv_fifobar;
+ u64 padding3;
+ } ccb_u3;
+ union {
+ char *recv_desc;
+ u64 padding4;
+ } ccb_u4;
+ u64 recv_ctrl;
+
+ union {
+ char __iomem *db_base;
+ u64 padding5;
+ } ccb_u5;
+
+ u64 channel;
+
+ /* unused context area (64 bytes) */
+};
+
+/* ccb queue parameters */
+#define SENDQ 1
+#define RECVQ 2
+#define NR_QENTRY 4
+#define L2_QENTRY_SZ 12
+#define DESC_MEM_SZ(_descs) ((_descs) << L2_QENTRY_SZ)
+
+/* ccb ctrl bitfields */
+#define CTRL_BITPOS_L2SZ 0
+#define CTRL_BITPOS_FIFOINDEXMASK 4
+#define CTRL_BITPOS_DESCLIMIT 18
+#define CTRL_BITPOS_A 30
+#define CTRL_BITPOS_G 31
+
+#define CTRL_SET(_c, _l, _f, _d, _a, _g) \
+ ((_c) = \
+ (((_l) << CTRL_BITPOS_L2SZ) |\
+ ((_f) << CTRL_BITPOS_FIFOINDEXMASK) |\
+ ((_d) << CTRL_BITPOS_DESCLIMIT) |\
+ ((_a) << CTRL_BITPOS_A) |\
+ ((_g) << CTRL_BITPOS_G)))
+
+/* ccb doorbell macros */
+#define L2_DB_SIZE 14
+#define ONE_DB_SIZE (1 << L2_DB_SIZE)
+#define DOORBELL_SET(_ccb) (iowrite8(1, (_ccb)->ccb_u5.db_base))
+#define DOORBELL_CLR(_ccb) (iowrite8(2, (_ccb)->ccb_u5.db_base))
+
+/*
+ * Per fd structure used to track the ccb allocated to that dev file.
+ */
+struct ccb_data {
+ /* software version of ccb, using virtual addrs */
+ struct ccb driver_ccb;
+
+ /* hardware version of ccb, using physical addrs */
+ struct ccb ilo_ccb;
+
+ /* hardware ccb is written to this shared mapped device memory */
+ struct ccb __iomem *mapped_ccb;
+
+ /* dma'able memory used for send/recv queues */
+ void *dma_va;
+ dma_addr_t dma_pa;
+ size_t dma_size;
+
+ /* pointer to hardware device info */
+ struct ilo_hwinfo *ilo_hw;
+
+ /* usage count, to allow for shared ccb's */
+ int ccb_cnt;
+
+ /* open wanted exclusive access to this ccb */
+ int ccb_excl;
+};
+
+/*
+ * FIFO queue structure, shared with hw.
+ */
+#define ILO_START_ALIGN 4096
+#define ILO_CACHE_SZ 128
+struct fifo {
+ u64 nrents; /* user requested number of fifo entries */
+ u64 imask; /* mask to extract valid fifo index */
+ u64 merge; /* O/C bits to merge in during enqueue operation */
+ u64 reset; /* set to non-zero when the target device resets */
+ u8 pad_0[ILO_CACHE_SZ - (sizeof(u64) * 4)];
+
+ u64 head;
+ u8 pad_1[ILO_CACHE_SZ - (sizeof(u64))];
+
+ u64 tail;
+ u8 pad_2[ILO_CACHE_SZ - (sizeof(u64))];
+
+ u64 fifobar[1];
+};
+
+/* convert between struct fifo, and the fifobar, which is saved in the ccb */
+#define FIFOHANDLESIZE (sizeof(struct fifo) - sizeof(u64))
+#define FIFOBARTOHANDLE(_fifo) \
+ ((struct fifo *)(((char *)(_fifo)) - FIFOHANDLESIZE))
+
+/* set a flag indicating this channel needs a reset */
+#define SET_CHANNEL_RESET(_ccb) \
+ (FIFOBARTOHANDLE((_ccb)->ccb_u1.send_fifobar)->reset = 1)
+
+/* check for this particular channel needing a reset */
+#define IS_CHANNEL_RESET(_ccb) \
+ (FIFOBARTOHANDLE((_ccb)->ccb_u1.send_fifobar)->reset)
+
+/* overall size of a fifo is determined by the number of entries it contains */
+#define FIFO_SZ(_num) (((_num)*sizeof(u64)) + FIFOHANDLESIZE)
+
+/* the number of qwords to consume from the entry descriptor */
+#define ENTRY_BITPOS_QWORDS 0
+/* descriptor index number (within a specified queue) */
+#define ENTRY_BITPOS_DESCRIPTOR 10
+/* state bit, fifo entry consumed by consumer */
+#define ENTRY_BITPOS_C 22
+/* state bit, fifo entry is occupied */
+#define ENTRY_BITPOS_O 23
+
+#define ENTRY_BITS_QWORDS 10
+#define ENTRY_BITS_DESCRIPTOR 12
+#define ENTRY_BITS_C 1
+#define ENTRY_BITS_O 1
+#define ENTRY_BITS_TOTAL \
+ (ENTRY_BITS_C + ENTRY_BITS_O + \
+ ENTRY_BITS_QWORDS + ENTRY_BITS_DESCRIPTOR)
+
+/* extract various entry fields */
+#define ENTRY_MASK ((1 << ENTRY_BITS_TOTAL) - 1)
+#define ENTRY_MASK_C (((1 << ENTRY_BITS_C) - 1) << ENTRY_BITPOS_C)
+#define ENTRY_MASK_O (((1 << ENTRY_BITS_O) - 1) << ENTRY_BITPOS_O)
+#define ENTRY_MASK_QWORDS \
+ (((1 << ENTRY_BITS_QWORDS) - 1) << ENTRY_BITPOS_QWORDS)
+#define ENTRY_MASK_DESCRIPTOR \
+ (((1 << ENTRY_BITS_DESCRIPTOR) - 1) << ENTRY_BITPOS_DESCRIPTOR)
+
+#define ENTRY_MASK_NOSTATE (ENTRY_MASK >> (ENTRY_BITS_C + ENTRY_BITS_O))
+
+#define GETQWORDS(_e) (((_e) & ENTRY_MASK_QWORDS) >> ENTRY_BITPOS_QWORDS)
+#define GETDESC(_e) (((_e) & ENTRY_MASK_DESCRIPTOR) >> ENTRY_BITPOS_DESCRIPTOR)
+
+#define QWORDS(_B) (((_B) & 7) ? (((_B) >> 3) + 1) : ((_B) >> 3))
+
+#endif /* __HPILO_H */
diff -urpN linux-2.6.26-rc7.orig/drivers/misc/Kconfig linux-2.6.26-rc7/drivers/misc/Kconfig
--- linux-2.6.26-rc7.orig/drivers/misc/Kconfig 2008-06-23 08:43:54.000000000 -0500
+++ linux-2.6.26-rc7/drivers/misc/Kconfig 2008-06-23 08:47:14.000000000 -0500
@@ -391,4 +391,17 @@ config SGI_XP
this feature will allow for direct communication between SSIs
based on a network adapter and DMA messaging.

+config HP_ILO
+ tristate "Channel interface driver for HP iLO/iLO2 processor"
+ default n
+ help
+ The channel interface driver allows applications to communicate
+ with iLO/iLO2 management processors present on HP ProLiant
+ servers. Upon loading, the driver creates /dev/hpilo/dXccbN files,
+ which can be used to gather data from the management processor,
+ via read and write system calls.
+
+ To compile this driver as a module, choose M here: the
+ module will be called hpilo.
+
endif # MISC_DEVICES
diff -urpN linux-2.6.26-rc7.orig/drivers/misc/Makefile linux-2.6.26-rc7/drivers/misc/Makefile
--- linux-2.6.26-rc7.orig/drivers/misc/Makefile 2008-06-23 08:43:54.000000000 -0500
+++ linux-2.6.26-rc7/drivers/misc/Makefile 2008-06-23 08:46:07.000000000 -0500
@@ -26,3 +26,4 @@ obj-$(CONFIG_INTEL_MENLOW) += intel_menl
obj-$(CONFIG_ENCLOSURE_SERVICES) += enclosure.o
obj-$(CONFIG_KGDB_TESTS) += kgdbts.o
obj-$(CONFIG_SGI_XP) += sgi-xp/
+obj-$(CONFIG_HP_ILO) += hpilo.o

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