/* * Driver for the HP iLO management processor. * * Copyright (C) 2008 Hewlett-Packard Development Company, L.P. * David Altobelli <david.altobelli@hpe.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/interrupt.h>#include <linux/ioport.h>#include <linux/device.h>#include <linux/file.h>#include <linux/cdev.h>#include <linux/sched.h>#include <linux/spinlock.h>#include <linux/delay.h>#include <linux/uaccess.h>#include <linux/io.h>#include <linux/wait.h>#include <linux/poll.h>#include <linux/slab.h>#include "hpilo.h" static struct class *ilo_class;static unsigned int ilo_major;static unsigned int max_ccb = 16;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); unsigned long flags; int ret = 0; 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] |= (entry & ENTRY_MASK_NOSTATE) | fifo_q->merge; fifo_q->tail += 1; ret = 1; } spin_unlock_irqrestore(&hw->fifo_lock, flags); return ret;} 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_irqsave(&hw->fifo_lock, flags); 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_irqrestore(&hw->fifo_lock, flags); return ret;} static int fifo_check_recv(struct ilo_hwinfo *hw, char *fifobar){ struct fifo *fifo_q = FIFOBARTOHANDLE(fifobar); unsigned long flags; int ret = 0; u64 c; spin_lock_irqsave(&hw->fifo_lock, flags); c = fifo_q->fifobar[fifo_q->head & fifo_q->imask]; if (c & ENTRY_MASK_C) ret = 1; spin_unlock_irqrestore(&hw->fifo_lock, flags); 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 int ilo_pkt_recv(struct ilo_hwinfo *hw, struct ccb *ccb){ char *fifobar = ccb->ccb_u3.recv_fifobar; return fifo_check_recv(hw, fifobar);} 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 = &data->driver_ccb; struct ccb __iomem *device_ccb = data->mapped_ccb; int retries; /* 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 = MAX_WAIT; retries > 0; retries--) { doorbell_set(driver_ccb); udelay(WAIT_TIME); 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_setup(struct ilo_hwinfo *hw, struct ccb_data *data, int slot){ char *dma_va; dma_addr_t dma_pa; struct ccb *driver_ccb, *ilo_ccb; driver_ccb = &data->driver_ccb; ilo_ccb = &data->ilo_ccb; data->dma_size = 2 * fifo_sz(NR_QENTRY) + 2 * desc_mem_sz(NR_QENTRY) + ILO_START_ALIGN + ILO_CACHE_SZ; data->dma_va = pci_alloc_consistent(hw->ilo_dev, data->dma_size, &data->dma_pa); if (!data->dma_va) return -ENOMEM; dma_va = (char *)data->dma_va; dma_pa = data->dma_pa; memset(dma_va, 0, data->dma_size); dma_va = (char *)roundup((unsigned long)dma_va, ILO_START_ALIGN); dma_pa = roundup(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_pa = 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 = roundup(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_pa = 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_pa = 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_pa = 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 */ return 0;} static void ilo_ccb_open(struct ilo_hwinfo *hw, struct ccb_data *data, int slot){ int pkt_id, pkt_sz; struct ccb *driver_ccb = &data->driver_ccb; /* 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, &data->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); /* the ccb is ready to use */ doorbell_clr(driver_ccb);} static int ilo_ccb_verify(struct ilo_hwinfo *hw, struct ccb_data *data){ int pkt_id, i; struct ccb *driver_ccb = &data->driver_ccb; /* make sure iLO is really handling requests */ for (i = MAX_WAIT; i > 0; i--) { if (ilo_pkt_dequeue(hw, driver_ccb, SENDQ, &pkt_id, NULL, NULL)) break; udelay(WAIT_TIME); } if (i == 0) { dev_err(&hw->ilo_dev->dev, "Open could not dequeue a packet\n"); return -EBUSY; } ilo_pkt_enqueue(hw, driver_ccb, SENDQ, pkt_id, 0); doorbell_set(driver_ccb); return 0;} 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 get_device_outbound(struct ilo_hwinfo *hw){ return ioread32(&hw->mmio_vaddr[DB_OUT]);} static inline int is_db_reset(int db_out){ return db_out & (1 << DB_RESET);} static inline int is_device_reset(struct ilo_hwinfo *hw){ /* check for global reset condition */ return is_db_reset(get_device_outbound(hw));} static inline void clear_pending_db(struct ilo_hwinfo *hw, int clr){ iowrite32(clr, &hw->mmio_vaddr[DB_OUT]);} static inline void clear_device(struct ilo_hwinfo *hw){ /* clear the device (reset bits, pending channel entries) */ clear_pending_db(hw, -1);} 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; /* * 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); }} 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 = fp->private_data; struct ccb *driver_ccb = &data->driver_ccb; struct ilo_hwinfo *hw = data->ilo_hw; void *pkt; if (is_channel_reset(driver_ccb)) { /* * If the device has been reset, applications * need to close and reopen all ccbs. */ 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 = fp->private_data; struct ccb *driver_ccb = &data->driver_ccb; struct ilo_hwinfo *hw = data->ilo_hw; void *pkt; 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)) return -EBUSY; Lines 1–500 of 921. 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/* * Driver for the HP iLO management processor. * * Copyright (C) 2008 Hewlett-Packard Development Company, L.P. * David Altobelli <david.altobelli@hpe.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/interrupt.h> #include <linux/ioport.h> #include <linux/device.h> #include <linux/file.h> #include <linux/cdev.h> #include <linux/sched.h> #include <linux/spinlock.h> #include <linux/delay.h> #include <linux/uaccess.h> #include <linux/io.h> #include <linux/wait.h> #include <linux/poll.h> #include <linux/slab.h> #include "hpilo.h" static struct class *ilo_class; static unsigned int ilo_major; static unsigned int max_ccb = 16; 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); unsigned long flags; int ret = 0; 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] |= (entry & ENTRY_MASK_NOSTATE) | fifo_q->merge; fifo_q->tail += 1; ret = 1; } spin_unlock_irqrestore(&hw->fifo_lock, flags); return ret; } 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_irqsave(&hw->fifo_lock, flags); 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_irqrestore(&hw->fifo_lock, flags); return ret; } static int fifo_check_recv(struct ilo_hwinfo *hw, char *fifobar) { struct fifo *fifo_q = FIFOBARTOHANDLE(fifobar); unsigned long flags; int ret = 0; u64 c; spin_lock_irqsave(&hw->fifo_lock, flags); c = fifo_q->fifobar[fifo_q->head & fifo_q->imask]; if (c & ENTRY_MASK_C) ret = 1; spin_unlock_irqrestore(&hw->fifo_lock, flags); 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 int ilo_pkt_recv(struct ilo_hwinfo *hw, struct ccb *ccb) { char *fifobar = ccb->ccb_u3.recv_fifobar; return fifo_check_recv(hw, fifobar); } 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 = &data->driver_ccb; struct ccb __iomem *device_ccb = data->mapped_ccb; int retries; /* 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 = MAX_WAIT; retries > 0; retries--) { doorbell_set(driver_ccb); udelay(WAIT_TIME); 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_setup(struct ilo_hwinfo *hw, struct ccb_data *data, int slot) { char *dma_va; dma_addr_t dma_pa; struct ccb *driver_ccb, *ilo_ccb; driver_ccb = &data->driver_ccb; ilo_ccb = &data->ilo_ccb; data->dma_size = 2 * fifo_sz(NR_QENTRY) + 2 * desc_mem_sz(NR_QENTRY) + ILO_START_ALIGN + ILO_CACHE_SZ; data->dma_va = pci_alloc_consistent(hw->ilo_dev, data->dma_size, &data->dma_pa); if (!data->dma_va) return -ENOMEM; dma_va = (char *)data->dma_va; dma_pa = data->dma_pa; memset(dma_va, 0, data->dma_size); dma_va = (char *)roundup((unsigned long)dma_va, ILO_START_ALIGN); dma_pa = roundup(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_pa = 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 = roundup(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_pa = 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_pa = 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_pa = 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 */ return 0; } static void ilo_ccb_open(struct ilo_hwinfo *hw, struct ccb_data *data, int slot) { int pkt_id, pkt_sz; struct ccb *driver_ccb = &data->driver_ccb; /* 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, &data->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); /* the ccb is ready to use */ doorbell_clr(driver_ccb); } static int ilo_ccb_verify(struct ilo_hwinfo *hw, struct ccb_data *data) { int pkt_id, i; struct ccb *driver_ccb = &data->driver_ccb; /* make sure iLO is really handling requests */ for (i = MAX_WAIT; i > 0; i--) { if (ilo_pkt_dequeue(hw, driver_ccb, SENDQ, &pkt_id, NULL, NULL)) break; udelay(WAIT_TIME); } if (i == 0) { dev_err(&hw->ilo_dev->dev, "Open could not dequeue a packet\n"); return -EBUSY; } ilo_pkt_enqueue(hw, driver_ccb, SENDQ, pkt_id, 0); doorbell_set(driver_ccb); return 0; } 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 get_device_outbound(struct ilo_hwinfo *hw) { return ioread32(&hw->mmio_vaddr[DB_OUT]); } static inline int is_db_reset(int db_out) { return db_out & (1 << DB_RESET); } static inline int is_device_reset(struct ilo_hwinfo *hw) { /* check for global reset condition */ return is_db_reset(get_device_outbound(hw)); } static inline void clear_pending_db(struct ilo_hwinfo *hw, int clr) { iowrite32(clr, &hw->mmio_vaddr[DB_OUT]); } static inline void clear_device(struct ilo_hwinfo *hw) { /* clear the device (reset bits, pending channel entries) */ clear_pending_db(hw, -1); } 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; /* * 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); } } 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 = fp->private_data; struct ccb *driver_ccb = &data->driver_ccb; struct ilo_hwinfo *hw = data->ilo_hw; void *pkt; if (is_channel_reset(driver_ccb)) { /* * If the device has been reset, applications * need to close and reopen all ccbs. */ 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 = fp->private_data; struct ccb *driver_ccb = &data->driver_ccb; struct ilo_hwinfo *hw = data->ilo_hw; void *pkt; 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)) return -EBUSY;