diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/misc/Kconfig | 13 | ||||
| -rw-r--r-- | drivers/misc/Makefile | 1 | ||||
| -rw-r--r-- | drivers/misc/hpilo.c | 768 | ||||
| -rw-r--r-- | drivers/misc/hpilo.h | 189 |
4 files changed, 971 insertions, 0 deletions
diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig index 1921b8dbb242..ce67d973d349 100644 --- a/drivers/misc/Kconfig +++ b/drivers/misc/Kconfig @@ -420,4 +420,17 @@ 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 --git a/drivers/misc/Makefile b/drivers/misc/Makefile index a6dac6a2e7e5..688fe76135e0 100644 --- a/drivers/misc/Makefile +++ b/drivers/misc/Makefile @@ -27,3 +27,4 @@ obj-$(CONFIG_INTEL_MENLOW) += intel_menlow.o obj-$(CONFIG_ENCLOSURE_SERVICES) += enclosure.o obj-$(CONFIG_KGDB_TESTS) += kgdbts.o obj-$(CONFIG_SGI_XP) += sgi-xp/ +obj-$(CONFIG_HP_ILO) += hpilo.o diff --git a/drivers/misc/hpilo.c b/drivers/misc/hpilo.c new file mode 100644 index 000000000000..05e298289238 --- /dev/null +++ b/drivers/misc/hpilo.c @@ -0,0 +1,768 @@ +/* + * 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]; + +static inline int get_entry_id(int entry) +{ + return (entry & ENTRY_MASK_DESCRIPTOR) >> ENTRY_BITPOS_DESCRIPTOR; +} + +static inline int get_entry_len(int entry) +{ + return ((entry & ENTRY_MASK_QWORDS) >> ENTRY_BITPOS_QWORDS) << 3; +} + +static inline int mk_entry(int id, int len) +{ + int qlen = len & 7 ? (len >> 3) + 1 : len >> 3; + return id << ENTRY_BITPOS_DESCRIPTOR | qlen << ENTRY_BITPOS_QWORDS; +} + +static inline int desc_mem_sz(int nr_entry) +{ + return nr_entry << L2_QENTRY_SZ; +} + +/* + * 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 *fifo_q = FIFOBARTOHANDLE(fifobar); + int ret = 0; + + spin_lock(&hw->fifo_lock); + if (!(fifo_q->fifobar[(fifo_q->tail + 1) & fifo_q->imask] + & ENTRY_MASK_O)) { + fifo_q->fifobar[fifo_q->tail & fifo_q->imask] |= + (entry & ENTRY_MASK_NOSTATE) | fifo_q->merge; + fifo_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 *fifo_q = FIFOBARTOHANDLE(fifobar); + int ret = 0; + u64 c; + + spin_lock(&hw->fifo_lock); + c = fifo_q->fifobar[fifo_q->head & fifo_q->imask]; + if (c & ENTRY_MASK_C) { + if (entry) + *entry = c & ENTRY_MASK_NOSTATE; + + fifo_q->fifobar[fifo_q->head & fifo_q->imask] = + (c | ENTRY_MASK) + 1; + fifo_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 = mk_entry(id, len); + 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 = get_entry_id(entry); + if (id) + *id = pkt_id; + if (len) + *len = get_entry_len(entry); + if (pkt) + *pkt = (void *)(desc + desc_mem_sz(pkt_id)); + } + + return ret; +} + +static inline void doorbell_set(struct ccb *ccb) +{ + iowrite8(1, ccb->ccb_u5.db_base); +} + +static inline void doorbell_clr(struct ccb *ccb) +{ + iowrite8(2, ccb->ccb_u5.db_base); +} +static inline int ctrl_set(int l2sz, int idxmask, int desclim) +{ + int active = 0, go = 1; + return l2sz << CTRL_BITPOS_L2SZ | + idxmask << CTRL_BITPOS_FIFOINDEXMASK | + desclim << CTRL_BITPOS_DESCLIMIT | + active << CTRL_BITPOS_A | + go << CTRL_BITPOS_G; +} +static void ctrl_setup(struct ccb *ccb, int nr_desc, int l2desc_sz) +{ + /* for simplicity, use the same parameters for send and recv ctrls */ + ccb->send_ctrl = ctrl_set(l2desc_sz, nr_desc-1, nr_desc-1); + ccb->recv_ctrl = ctrl_set(l2desc_sz, nr_desc-1, nr_desc-1); +} + +static inline int fifo_sz(int nr_entry) +{ + /* size of a fifo is determined by the number of entries it contains */ + return (nr_entry * sizeof(u64)) + FIFOHANDLESIZE; +} + +static void fifo_setup(void *base_addr, int nr_entry) +{ + struct fifo *fifo_q = base_addr; + int i; + + /* set up an empty fifo */ + fifo_q->head = 0; + fifo_q->tail = 0; + fifo_q->reset = 0; + fifo_q->nrents = nr_entry; + fifo_q->imask = nr_entry - 1; + fifo_q->merge = ENTRY_MASK_O; + + for (i = 0; i < nr_entry; i++) + fifo_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 inline int is_channel_reset(struct ccb *ccb) +{ + /* check for this particular channel needing a reset */ + return FIFOBARTOHANDLE(ccb->ccb_u1.send_fifobar)->reset; +} + +static inline void set_channel_reset(struct ccb *ccb) +{ + /* set a flag indicating this channel needs a reset */ + FIFOBARTOHANDLE(ccb->ccb_u1.send_fifobar)->reset = 1; +} + +static inline int is_device_reset(struct ilo_hwinfo *hw) +{ + /* check for global reset condition */ + return ioread32(&hw->mmio_vaddr[DB_OUT]) & (1 << DB_RESET); +} + +static inline void clear_device(struct ilo_hwinfo *hw) +{ + /* clear the device (reset bits, pending channel entries) */ + iowrite32(-1, &hw->mmio_vaddr[DB_OUT]); +} + +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); + + /* new ccb allocation */ + data = kzalloc(sizeof(*data), GFP_KERNEL); + if (!data) + return -ENOMEM; + + 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) { + /* create a channel control block for this minor */ + error = ilo_ccb_open(hw, data, slot); + if (!error) { + 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 + kfree(data); + } else { + kfree(data); + if (fp->f_flags & O_EXCL || hw->ccb_alloc[slot]->ccb_excl) { + /* + * The channel exists, and either this open + * or a previous open of this channel wants + * exclusive access. + */ + error = -EBUSY; + } else { + hw->ccb_alloc[slot]->ccb_cnt++; + error = 0; + } + } + spin_unlock(&hw->alloc_lock); + + if (!error) + fp->private_data = hw->ccb_alloc[slot]; + + return error; +} + +static const struct file_operations ilo_fops = { + .owner = 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(*ilo_hw), 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++) { + struct device *dev; + dev = device_create(ilo_class, &pdev->dev, + MKDEV(ilo_major, minor), NULL, + "hpilo!d%dccb%d", devnum, minor); + if (IS_ERR(dev)) + 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("0.05"); +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 --git a/drivers/misc/hpilo.h b/drivers/misc/hpilo.h new file mode 100644 index 000000000000..a281207696c1 --- /dev/null +++ b/drivers/misc/hpilo.h @@ -0,0 +1,189 @@ +/* + * 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 +/* DB_OUT reset bit */ +#define DB_RESET 26 + +/* + * 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 + +/* 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 + +/* ccb doorbell macros */ +#define L2_DB_SIZE 14 +#define ONE_DB_SIZE (1 << L2_DB_SIZE) + +/* + * 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)) + +/* 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)) + +#endif /* __HPILO_H */ |