Quelle megaraid_mm.c
Sprache: C
// SPDX-License-Identifier: GPL-2.0-or-later
/*
*
* Linux MegaRAID device driver
*
* Copyright ( c ) 2003 - 2004 LSI Logic Corporation .
*
* FILE : megaraid_mm . c
* Version : v2 . 20 . 2 . 7 ( Jul 16 2006 )
*
* Common management module
*/
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/mutex.h>
#include "megaraid_mm.h"
// Entry points for char node driver
static DEFINE_MUTEX(mraid_mm_mutex);
static int mraid_mm_open(struct inode *, struct file *);
static long mraid_mm_unlocked_ioctl(struct file *, uint, unsigned long );
// routines to convert to and from the old the format
static int mimd_to_kioc(mimd_t __user *, mraid_mmadp_t *, uioc_t *);
static int kioc_to_mimd(uioc_t *, mimd_t __user *);
// Helper functions
static int handle_drvrcmd(void __user *, uint8_t, int *);
static int lld_ioctl(mraid_mmadp_t *, uioc_t *);
static void ioctl_done(uioc_t *);
static void lld_timedout(struct timer_list *);
static void hinfo_to_cinfo(mraid_hba_info_t *, mcontroller_t *);
static mraid_mmadp_t *mraid_mm_get_adapter(mimd_t __user *, int *);
static uioc_t *mraid_mm_alloc_kioc(mraid_mmadp_t *);
static void mraid_mm_dealloc_kioc(mraid_mmadp_t *, uioc_t *);
static int mraid_mm_attach_buf(mraid_mmadp_t *, uioc_t *, int );
static int mraid_mm_setup_dma_pools(mraid_mmadp_t *);
static void mraid_mm_free_adp_resources(mraid_mmadp_t *);
static void mraid_mm_teardown_dma_pools(mraid_mmadp_t *);
MODULE_AUTHOR("LSI Logic Corporation" );
MODULE_DESCRIPTION("LSI Logic Management Module" );
MODULE_LICENSE("GPL" );
MODULE_VERSION(LSI_COMMON_MOD_VERSION);
static int dbglevel = CL_ANN;
module_param_named(dlevel, dbglevel, int , 0 );
MODULE_PARM_DESC(dlevel, "Debug level (default=0)" );
EXPORT_SYMBOL(mraid_mm_register_adp);
EXPORT_SYMBOL(mraid_mm_unregister_adp);
EXPORT_SYMBOL(mraid_mm_adapter_app_handle);
static uint32_t drvr_ver = 0 x02200207;
static int adapters_count_g;
static struct list_head adapters_list_g;
static wait_queue_head_t wait_q;
static const struct file_operations lsi_fops = {
.open = mraid_mm_open,
.unlocked_ioctl = mraid_mm_unlocked_ioctl,
.compat_ioctl = compat_ptr_ioctl,
.owner = THIS_MODULE,
.llseek = noop_llseek,
};
static struct miscdevice megaraid_mm_dev = {
.minor = MISC_DYNAMIC_MINOR,
.name = "megadev0" ,
.fops = &lsi_fops,
};
/**
* mraid_mm_open - open routine for char node interface
* @ inode : unused
* @ filep : unused
*
* Allow ioctl operations by apps only if they have superuser privilege .
*/
static int
mraid_mm_open(struct inode *inode, struct file *filep)
{
/*
* Only allow superuser to access private ioctl interface
*/
if (!capable(CAP_SYS_ADMIN)) return (-EACCES);
return 0 ;
}
/**
* mraid_mm_ioctl - module entry - point for ioctls
* @ filep : file operations pointer ( ignored )
* @ cmd : ioctl command
* @ arg : user ioctl packet
*/
static int
mraid_mm_ioctl(struct file *filep, unsigned int cmd, unsigned long arg)
{
uioc_t *kioc;
char signature[EXT_IOCTL_SIGN_SZ] = {0 };
int rval;
mraid_mmadp_t *adp;
uint8_t old_ioctl;
int drvrcmd_rval;
void __user *argp = (void __user *)arg;
/*
* Make sure only USCSICMD are issued through this interface .
* MIMD application would still fire different command .
*/
if ((_IOC_TYPE(cmd) != MEGAIOC_MAGIC) && (cmd != USCSICMD)) {
return (-EINVAL);
}
/*
* Look for signature to see if this is the new or old ioctl format .
*/
if (copy_from_user(signature, argp, EXT_IOCTL_SIGN_SZ)) {
con_log(CL_ANN, (KERN_WARNING
"megaraid cmm: copy from usr addr failed\n" ));
return (-EFAULT);
}
if (memcmp(signature, EXT_IOCTL_SIGN, EXT_IOCTL_SIGN_SZ) == 0 )
old_ioctl = 0 ;
else
old_ioctl = 1 ;
/*
* At present , we don ' t support the new ioctl packet
*/
if (!old_ioctl )
return (-EINVAL);
/*
* If it is a driver ioctl ( as opposed to fw ioctls ) , then we can
* handle the command locally . rval > 0 means it is not a drvr cmd
*/
rval = handle_drvrcmd(argp, old_ioctl, &drvrcmd_rval);
if (rval < 0 )
return rval;
else if (rval == 0 )
return drvrcmd_rval;
rval = 0 ;
if ((adp = mraid_mm_get_adapter(argp, &rval)) == NULL) {
return rval;
}
/*
* Check if adapter can accept ioctl . We may have marked it offline
* if any previous kioc had timedout on this controller .
*/
if (!adp->quiescent) {
con_log(CL_ANN, (KERN_WARNING
"megaraid cmm: controller cannot accept cmds due to "
"earlier errors\n" ));
return -EFAULT;
}
/*
* The following call will block till a kioc is available
* or return NULL if the list head is empty for the pointer
* of type mraid_mmapt passed to mraid_mm_alloc_kioc
*/
kioc = mraid_mm_alloc_kioc(adp);
if (!kioc)
return -ENXIO;
/*
* User sent the old mimd_t ioctl packet . Convert it to uioc_t .
*/
if ((rval = mimd_to_kioc(argp, adp, kioc))) {
mraid_mm_dealloc_kioc(adp, kioc);
return rval;
}
kioc->done = ioctl_done;
/*
* Issue the IOCTL to the low level driver . After the IOCTL completes
* release the kioc if and only if it was _ not_ timedout . If it was
* timedout , that means that resources are still with low level driver .
*/
if ((rval = lld_ioctl(adp, kioc))) {
if (!kioc->timedout)
mraid_mm_dealloc_kioc(adp, kioc);
return rval;
}
/*
* Convert the kioc back to user space
*/
rval = kioc_to_mimd(kioc, argp);
/*
* Return the kioc to free pool
*/
mraid_mm_dealloc_kioc(adp, kioc);
return rval;
}
static long
mraid_mm_unlocked_ioctl(struct file *filep, unsigned int cmd,
unsigned long arg)
{
int err;
mutex_lock(&mraid_mm_mutex);
err = mraid_mm_ioctl(filep, cmd, arg);
mutex_unlock(&mraid_mm_mutex);
return err;
}
/**
* mraid_mm_get_adapter - Returns corresponding adapters for the mimd packet
* @ umimd : User space mimd_t ioctl packet
* @ rval : returned success / error status
*
* The function return value is a pointer to the located @ adapter .
*/
static mraid_mmadp_t *
mraid_mm_get_adapter(mimd_t __user *umimd, int *rval)
{
mraid_mmadp_t *adapter;
mimd_t mimd;
uint32_t adapno;
int iterator;
bool is_found;
if (copy_from_user(&mimd, umimd, sizeof (mimd_t))) {
*rval = -EFAULT;
return NULL;
}
adapno = GETADAP(mimd.ui.fcs.adapno);
if (adapno >= adapters_count_g) {
*rval = -ENODEV;
return NULL;
}
adapter = NULL;
iterator = 0 ;
is_found = false ;
list_for_each_entry(adapter, &adapters_list_g, list) {
if (iterator++ == adapno) {
is_found = true ;
break ;
}
}
if (!is_found) {
*rval = -ENODEV;
return NULL;
}
return adapter;
}
/**
* handle_drvrcmd - Checks if the opcode is a driver cmd and if it is , handles it .
* @ arg : packet sent by the user app
* @ old_ioctl : mimd if 1 ; uioc otherwise
* @ rval : pointer for command ' s returned value ( not function status )
*/
static int
handle_drvrcmd(void __user *arg, uint8_t old_ioctl, int *rval)
{
mimd_t __user *umimd;
mimd_t kmimd;
uint8_t opcode;
uint8_t subopcode;
if (old_ioctl)
goto old_packet;
else
goto new_packet;
new_packet:
return (-ENOTSUPP);
old_packet:
*rval = 0 ;
umimd = arg;
if (copy_from_user(&kmimd, umimd, sizeof (mimd_t)))
return (-EFAULT);
opcode = kmimd.ui.fcs.opcode;
subopcode = kmimd.ui.fcs.subopcode;
/*
* If the opcode is 0 x82 and the subopcode is either GET_DRVRVER or
* GET_NUMADP , then we can handle . Otherwise we should return 1 to
* indicate that we cannot handle this .
*/
if (opcode != 0 x82)
return 1 ;
switch (subopcode) {
case MEGAIOC_QDRVRVER:
if (copy_to_user(kmimd.data, &drvr_ver, sizeof (uint32_t)))
return (-EFAULT);
return 0 ;
case MEGAIOC_QNADAP:
*rval = adapters_count_g;
if (copy_to_user(kmimd.data, &adapters_count_g,
sizeof (uint32_t)))
return (-EFAULT);
return 0 ;
default :
/* cannot handle */
return 1 ;
}
return 0 ;
}
/**
* mimd_to_kioc - Converter from old to new ioctl format
* @ umimd : user space old MIMD IOCTL
* @ adp : adapter softstate
* @ kioc : kernel space new format IOCTL
*
* Routine to convert MIMD interface IOCTL to new interface IOCTL packet . The
* new packet is in kernel space so that driver can perform operations on it
* freely .
*/
static int
mimd_to_kioc(mimd_t __user *umimd, mraid_mmadp_t *adp, uioc_t *kioc)
{
mbox64_t *mbox64;
mbox_t *mbox;
mraid_passthru_t *pthru32;
uint32_t adapno;
uint8_t opcode;
uint8_t subopcode;
mimd_t mimd;
if (copy_from_user(&mimd, umimd, sizeof (mimd_t)))
return (-EFAULT);
/*
* Applications are not allowed to send extd pthru
*/
if ((mimd.mbox[0 ] == MBOXCMD_PASSTHRU64) ||
(mimd.mbox[0 ] == MBOXCMD_EXTPTHRU))
return (-EINVAL);
opcode = mimd.ui.fcs.opcode;
subopcode = mimd.ui.fcs.subopcode;
adapno = GETADAP(mimd.ui.fcs.adapno);
if (adapno >= adapters_count_g)
return (-ENODEV);
kioc->adapno = adapno;
kioc->mb_type = MBOX_LEGACY;
kioc->app_type = APPTYPE_MIMD;
switch (opcode) {
case 0 x82:
if (subopcode == MEGAIOC_QADAPINFO) {
kioc->opcode = GET_ADAP_INFO;
kioc->data_dir = UIOC_RD;
kioc->xferlen = sizeof (mraid_hba_info_t);
if (mraid_mm_attach_buf(adp, kioc, kioc->xferlen))
return (-ENOMEM);
}
else {
con_log(CL_ANN, (KERN_WARNING
"megaraid cmm: Invalid subop\n" ));
return (-EINVAL);
}
break ;
case 0 x81:
kioc->opcode = MBOX_CMD;
kioc->xferlen = mimd.ui.fcs.length;
kioc->user_data_len = kioc->xferlen;
kioc->user_data = mimd.ui.fcs.buffer;
if (mraid_mm_attach_buf(adp, kioc, kioc->xferlen))
return (-ENOMEM);
if (mimd.outlen) kioc->data_dir = UIOC_RD;
if (mimd.inlen) kioc->data_dir |= UIOC_WR;
break ;
case 0 x80:
kioc->opcode = MBOX_CMD;
kioc->xferlen = (mimd.outlen > mimd.inlen) ?
mimd.outlen : mimd.inlen;
kioc->user_data_len = kioc->xferlen;
kioc->user_data = mimd.data;
if (mraid_mm_attach_buf(adp, kioc, kioc->xferlen))
return (-ENOMEM);
if (mimd.outlen) kioc->data_dir = UIOC_RD;
if (mimd.inlen) kioc->data_dir |= UIOC_WR;
break ;
default :
return (-EINVAL);
}
/*
* If driver command , nothing else to do
*/
if (opcode == 0 x82)
return 0 ;
/*
* This is a mailbox cmd ; copy the mailbox from mimd
*/
mbox64 = (mbox64_t *)((unsigned long )kioc->cmdbuf);
mbox = &mbox64->mbox32;
memcpy(mbox, mimd.mbox, 14 );
if (mbox->cmd != MBOXCMD_PASSTHRU) { // regular DCMD
mbox->xferaddr = (uint32_t)kioc->buf_paddr;
if (kioc->data_dir & UIOC_WR) {
if (copy_from_user(kioc->buf_vaddr, kioc->user_data,
kioc->xferlen)) {
return (-EFAULT);
}
}
return 0 ;
}
/*
* This is a regular 32 - bit pthru cmd ; mbox points to pthru struct .
* Just like in above case , the beginning for memblk is treated as
* a mailbox . The passthru will begin at next 1 K boundary . And the
* data will start 1 K after that .
*/
pthru32 = kioc->pthru32;
kioc->user_pthru = &umimd->pthru;
mbox->xferaddr = (uint32_t)kioc->pthru32_h;
if (copy_from_user(pthru32, kioc->user_pthru,
sizeof (mraid_passthru_t))) {
return (-EFAULT);
}
pthru32->dataxferaddr = kioc->buf_paddr;
if (kioc->data_dir & UIOC_WR) {
if (pthru32->dataxferlen > kioc->xferlen)
return -EINVAL;
if (copy_from_user(kioc->buf_vaddr, kioc->user_data,
pthru32->dataxferlen)) {
return (-EFAULT);
}
}
return 0 ;
}
/**
* mraid_mm_attach_buf - Attach a free dma buffer for required size
* @ adp : Adapter softstate
* @ kioc : kioc that the buffer needs to be attached to
* @ xferlen : required length for buffer
*
* First we search for a pool with smallest buffer that is > = @ xferlen . If
* that pool has no free buffer , we will try for the next bigger size . If none
* is available , we will try to allocate the smallest buffer that is > =
* @ xferlen and attach it the pool .
*/
static int
mraid_mm_attach_buf(mraid_mmadp_t *adp, uioc_t *kioc, int xferlen)
{
mm_dmapool_t *pool;
int right_pool = -1 ;
unsigned long flags;
int i;
kioc->pool_index = -1 ;
kioc->buf_vaddr = NULL;
kioc->buf_paddr = 0 ;
kioc->free_buf = 0 ;
/*
* We need xferlen amount of memory . See if we can get it from our
* dma pools . If we don ' t get exact size , we will try bigger buffer
*/
for (i = 0 ; i < MAX_DMA_POOLS; i++) {
pool = &adp->dma_pool_list[i];
if (xferlen > pool->buf_size)
continue ;
if (right_pool == -1 )
right_pool = i;
spin_lock_irqsave(&pool->lock, flags);
if (!pool->in_use) {
pool->in_use = 1 ;
kioc->pool_index = i;
kioc->buf_vaddr = pool->vaddr;
kioc->buf_paddr = pool->paddr;
spin_unlock_irqrestore(&pool->lock, flags);
return 0 ;
}
else {
spin_unlock_irqrestore(&pool->lock, flags);
continue ;
}
}
/*
* If xferlen doesn ' t match any of our pools , return error
*/
if (right_pool == -1 )
return -EINVAL;
/*
* We did not get any buffer from the preallocated pool . Let us try
* to allocate one new buffer . NOTE : This is a blocking call .
*/
pool = &adp->dma_pool_list[right_pool];
spin_lock_irqsave(&pool->lock, flags);
kioc->pool_index = right_pool;
kioc->free_buf = 1 ;
kioc->buf_vaddr = dma_pool_alloc(pool->handle, GFP_ATOMIC,
&kioc->buf_paddr);
spin_unlock_irqrestore(&pool->lock, flags);
if (!kioc->buf_vaddr)
return -ENOMEM;
return 0 ;
}
/**
* mraid_mm_alloc_kioc - Returns a uioc_t from free list
* @ adp : Adapter softstate for this module
*
* The kioc_semaphore is initialized with number of kioc nodes in the
* free kioc pool . If the kioc pool is empty , this function blocks till
* a kioc becomes free .
*/
static uioc_t *
mraid_mm_alloc_kioc(mraid_mmadp_t *adp)
{
uioc_t *kioc;
struct list_head* head;
unsigned long flags;
down(&adp->kioc_semaphore);
spin_lock_irqsave(&adp->kioc_pool_lock, flags);
head = &adp->kioc_pool;
if (list_empty(head)) {
up(&adp->kioc_semaphore);
spin_unlock_irqrestore(&adp->kioc_pool_lock, flags);
con_log(CL_ANN, ("megaraid cmm: kioc list empty!\n" ));
return NULL;
}
kioc = list_entry(head->next, uioc_t, list);
list_del_init(&kioc->list);
spin_unlock_irqrestore(&adp->kioc_pool_lock, flags);
memset((caddr_t)(unsigned long )kioc->cmdbuf, 0 , sizeof (mbox64_t));
memset((caddr_t) kioc->pthru32, 0 , sizeof (mraid_passthru_t));
kioc->buf_vaddr = NULL;
kioc->buf_paddr = 0 ;
kioc->pool_index =-1 ;
kioc->free_buf = 0 ;
kioc->user_data = NULL;
kioc->user_data_len = 0 ;
kioc->user_pthru = NULL;
kioc->timedout = 0 ;
return kioc;
}
/**
* mraid_mm_dealloc_kioc - Return kioc to free pool
* @ adp : Adapter softstate
* @ kioc : uioc_t node to be returned to free pool
*/
static void
mraid_mm_dealloc_kioc(mraid_mmadp_t *adp, uioc_t *kioc)
{
mm_dmapool_t *pool;
unsigned long flags;
if (kioc->pool_index != -1 ) {
pool = &adp->dma_pool_list[kioc->pool_index];
/* This routine may be called in non-isr context also */
spin_lock_irqsave(&pool->lock, flags);
/*
* While attaching the dma buffer , if we didn ' t get the
* required buffer from the pool , we would have allocated
* it at the run time and set the free_buf flag . We must
* free that buffer . Otherwise , just mark that the buffer is
* not in use
*/
if (kioc->free_buf == 1 )
dma_pool_free(pool->handle, kioc->buf_vaddr,
kioc->buf_paddr);
else
pool->in_use = 0 ;
spin_unlock_irqrestore(&pool->lock, flags);
}
/* Return the kioc to the free pool */
spin_lock_irqsave(&adp->kioc_pool_lock, flags);
list_add(&kioc->list, &adp->kioc_pool);
spin_unlock_irqrestore(&adp->kioc_pool_lock, flags);
/* increment the free kioc count */
up(&adp->kioc_semaphore);
return ;
}
/**
* lld_ioctl - Routine to issue ioctl to low level drvr
* @ adp : The adapter handle
* @ kioc : The ioctl packet with kernel addresses
*/
static int
lld_ioctl(mraid_mmadp_t *adp, uioc_t *kioc)
{
int rval;
struct uioc_timeout timeout = { };
kioc->status = -ENODATA;
rval = adp->issue_uioc(adp->drvr_data, kioc, IOCTL_ISSUE);
if (rval) return rval;
/*
* Start the timer
*/
if (adp->timeout > 0 ) {
timeout.uioc = kioc;
timer_setup_on_stack(&timeout.timer, lld_timedout, 0 );
timeout.timer.expires = jiffies + adp->timeout * HZ;
add_timer(&timeout.timer);
}
/*
* Wait till the low level driver completes the ioctl . After this
* call , the ioctl either completed successfully or timedout .
*/
wait_event(wait_q, (kioc->status != -ENODATA));
if (timeout.timer.function) {
timer_delete_sync(&timeout.timer);
timer_destroy_on_stack(&timeout.timer);
}
/*
* If the command had timedout , we mark the controller offline
* before returning
*/
if (kioc->timedout) {
adp->quiescent = 0 ;
}
return kioc->status;
}
/**
* ioctl_done - callback from the low level driver
* @ kioc : completed ioctl packet
*/
static void
ioctl_done(uioc_t *kioc)
{
uint32_t adapno;
int iterator;
mraid_mmadp_t* adapter;
bool is_found;
/*
* When the kioc returns from driver , make sure it still doesn ' t
* have ENODATA in status . Otherwise , driver will hang on wait_event
* forever
*/
if (kioc->status == -ENODATA) {
con_log(CL_ANN, (KERN_WARNING
"megaraid cmm: lld didn't change status!\n" ));
kioc->status = -EINVAL;
}
/*
* Check if this kioc was timedout before . If so , nobody is waiting
* on this kioc . We don ' t have to wake up anybody . Instead , we just
* have to free the kioc
*/
if (kioc->timedout) {
iterator = 0 ;
adapter = NULL;
adapno = kioc->adapno;
is_found = false ;
con_log(CL_ANN, ( KERN_WARNING "megaraid cmm: completed "
"ioctl that was timedout before\n" ));
list_for_each_entry(adapter, &adapters_list_g, list) {
if (iterator++ == adapno) {
is_found = true ;
break ;
}
}
kioc->timedout = 0 ;
if (is_found)
mraid_mm_dealloc_kioc( adapter, kioc );
}
else {
wake_up(&wait_q);
}
}
/**
* lld_timedout - callback from the expired timer
* @ t : timer that timed out
*/
static void
lld_timedout(struct timer_list *t)
{
struct uioc_timeout *timeout = timer_container_of(timeout, t, timer);
uioc_t *kioc = timeout->uioc;
kioc->status = -ETIME;
kioc->timedout = 1 ;
con_log(CL_ANN, (KERN_WARNING "megaraid cmm: ioctl timed out\n" ));
wake_up(&wait_q);
}
/**
* kioc_to_mimd - Converter from new back to old format
* @ kioc : Kernel space IOCTL packet ( successfully issued )
* @ mimd : User space MIMD packet
*/
static int
kioc_to_mimd(uioc_t *kioc, mimd_t __user *mimd)
{
mimd_t kmimd;
uint8_t opcode;
uint8_t subopcode;
mbox64_t *mbox64;
mraid_passthru_t __user *upthru32;
mraid_passthru_t *kpthru32;
mcontroller_t cinfo;
mraid_hba_info_t *hinfo;
if (copy_from_user(&kmimd, mimd, sizeof (mimd_t)))
return (-EFAULT);
opcode = kmimd.ui.fcs.opcode;
subopcode = kmimd.ui.fcs.subopcode;
if (opcode == 0 x82) {
switch (subopcode) {
case MEGAIOC_QADAPINFO:
hinfo = (mraid_hba_info_t *)(unsigned long )
kioc->buf_vaddr;
hinfo_to_cinfo(hinfo, &cinfo);
if (copy_to_user(kmimd.data, &cinfo, sizeof (cinfo)))
return (-EFAULT);
return 0 ;
default :
return (-EINVAL);
}
return 0 ;
}
mbox64 = (mbox64_t *)(unsigned long )kioc->cmdbuf;
if (kioc->user_pthru) {
upthru32 = kioc->user_pthru;
kpthru32 = kioc->pthru32;
if (copy_to_user(&upthru32->scsistatus,
&kpthru32->scsistatus,
sizeof (uint8_t))) {
return (-EFAULT);
}
}
if (kioc->user_data) {
if (copy_to_user(kioc->user_data, kioc->buf_vaddr,
kioc->user_data_len)) {
return (-EFAULT);
}
}
if (copy_to_user(&mimd->mbox[17 ],
&mbox64->mbox32.status, sizeof (uint8_t))) {
return (-EFAULT);
}
return 0 ;
}
/**
* hinfo_to_cinfo - Convert new format hba info into old format
* @ hinfo : New format , more comprehensive adapter info
* @ cinfo : Old format adapter info to support mimd_t apps
*/
static void
hinfo_to_cinfo(mraid_hba_info_t *hinfo, mcontroller_t *cinfo)
{
if (!hinfo || !cinfo)
return ;
cinfo->base = hinfo->baseport;
cinfo->irq = hinfo->irq;
cinfo->numldrv = hinfo->num_ldrv;
cinfo->pcibus = hinfo->pci_bus;
cinfo->pcidev = hinfo->pci_slot;
cinfo->pcifun = PCI_FUNC(hinfo->pci_dev_fn);
cinfo->pciid = hinfo->pci_device_id;
cinfo->pcivendor = hinfo->pci_vendor_id;
cinfo->pcislot = hinfo->pci_slot;
cinfo->uid = hinfo->unique_id;
}
/**
* mraid_mm_register_adp - Registration routine for low level drivers
* @ lld_adp : Adapter object
*/
int
mraid_mm_register_adp(mraid_mmadp_t *lld_adp)
{
mraid_mmadp_t *adapter;
mbox64_t *mbox_list;
uioc_t *kioc;
uint32_t rval;
int i;
if (lld_adp->drvr_type != DRVRTYPE_MBOX)
return (-EINVAL);
adapter = kzalloc(sizeof (mraid_mmadp_t), GFP_KERNEL);
if (!adapter)
return -ENOMEM;
adapter->unique_id = lld_adp->unique_id;
adapter->drvr_type = lld_adp->drvr_type;
adapter->drvr_data = lld_adp->drvr_data;
adapter->pdev = lld_adp->pdev;
adapter->issue_uioc = lld_adp->issue_uioc;
adapter->timeout = lld_adp->timeout;
adapter->max_kioc = lld_adp->max_kioc;
adapter->quiescent = 1 ;
/*
* Allocate single blocks of memory for all required kiocs ,
* mailboxes and passthru structures .
*/
adapter->kioc_list = kmalloc_array(lld_adp->max_kioc,
sizeof (uioc_t),
GFP_KERNEL);
adapter->mbox_list = kmalloc_array(lld_adp->max_kioc,
sizeof (mbox64_t),
GFP_KERNEL);
adapter->pthru_dma_pool = dma_pool_create("megaraid mm pthru pool" ,
&adapter->pdev->dev,
sizeof (mraid_passthru_t),
16 , 0 );
if (!adapter->kioc_list || !adapter->mbox_list ||
!adapter->pthru_dma_pool) {
con_log(CL_ANN, (KERN_WARNING
"megaraid cmm: out of memory, %s %d\n" , __func__,
__LINE__));
rval = (-ENOMEM);
goto memalloc_error;
}
/*
* Slice kioc_list and make a kioc_pool with the individiual kiocs
*/
INIT_LIST_HEAD(&adapter->kioc_pool);
spin_lock_init(&adapter->kioc_pool_lock);
sema_init(&adapter->kioc_semaphore, lld_adp->max_kioc);
mbox_list = (mbox64_t *)adapter->mbox_list;
for (i = 0 ; i < lld_adp->max_kioc; i++) {
kioc = adapter->kioc_list + i;
kioc->cmdbuf = (uint64_t)(unsigned long )(mbox_list + i);
kioc->pthru32 = dma_pool_alloc(adapter->pthru_dma_pool,
GFP_KERNEL, &kioc->pthru32_h);
if (!kioc->pthru32) {
con_log(CL_ANN, (KERN_WARNING
"megaraid cmm: out of memory, %s %d\n" ,
__func__, __LINE__));
rval = (-ENOMEM);
goto pthru_dma_pool_error;
}
list_add_tail(&kioc->list, &adapter->kioc_pool);
}
// Setup the dma pools for data buffers
if ((rval = mraid_mm_setup_dma_pools(adapter)) != 0 ) {
goto dma_pool_error;
}
list_add_tail(&adapter->list, &adapters_list_g);
adapters_count_g++;
return 0 ;
dma_pool_error:
/* Do nothing */
pthru_dma_pool_error:
for (i = 0 ; i < lld_adp->max_kioc; i++) {
kioc = adapter->kioc_list + i;
if (kioc->pthru32) {
dma_pool_free(adapter->pthru_dma_pool, kioc->pthru32,
kioc->pthru32_h);
}
}
memalloc_error:
kfree(adapter->kioc_list);
kfree(adapter->mbox_list);
dma_pool_destroy(adapter->pthru_dma_pool);
kfree(adapter);
return rval;
}
/**
* mraid_mm_adapter_app_handle - return the application handle for this adapter
* @ unique_id : adapter unique identifier
*
* For the given driver data , locate the adapter in our global list and
* return the corresponding handle , which is also used by applications to
* uniquely identify an adapter .
*
* Return adapter handle if found in the list .
* Return 0 if adapter could not be located , should never happen though .
*/
uint32_t
mraid_mm_adapter_app_handle(uint32_t unique_id)
{
mraid_mmadp_t *adapter;
mraid_mmadp_t *tmp;
int index = 0 ;
list_for_each_entry_safe(adapter, tmp, &adapters_list_g, list) {
if (adapter->unique_id == unique_id) {
return MKADAP(index);
}
index++;
}
return 0 ;
}
/**
* mraid_mm_setup_dma_pools - Set up dma buffer pools per adapter
* @ adp : Adapter softstate
*
* We maintain a pool of dma buffers per each adapter . Each pool has one
* buffer . E . g , we may have 5 dma pools - one each for 4 k , 8 k . . . 64 k buffers .
* We have just one 4 k buffer in 4 k pool , one 8 k buffer in 8 k pool etc . We
* dont ' want to waste too much memory by allocating more buffers per each
* pool .
*/
static int
mraid_mm_setup_dma_pools(mraid_mmadp_t *adp)
{
mm_dmapool_t *pool;
int bufsize;
int i;
/*
* Create MAX_DMA_POOLS number of pools
*/
bufsize = MRAID_MM_INIT_BUFF_SIZE;
for (i = 0 ; i < MAX_DMA_POOLS; i++){
pool = &adp->dma_pool_list[i];
pool->buf_size = bufsize;
spin_lock_init(&pool->lock);
pool->handle = dma_pool_create("megaraid mm data buffer" ,
&adp->pdev->dev, bufsize,
16 , 0 );
if (!pool->handle) {
goto dma_pool_setup_error;
}
pool->vaddr = dma_pool_alloc(pool->handle, GFP_KERNEL,
&pool->paddr);
if (!pool->vaddr)
goto dma_pool_setup_error;
bufsize = bufsize * 2 ;
}
return 0 ;
dma_pool_setup_error:
mraid_mm_teardown_dma_pools(adp);
return (-ENOMEM);
}
/**
* mraid_mm_unregister_adp - Unregister routine for low level drivers
* @ unique_id : UID of the adpater
*
* Assumes no outstanding ioctls to llds .
*/
int
mraid_mm_unregister_adp(uint32_t unique_id)
{
mraid_mmadp_t *adapter;
mraid_mmadp_t *tmp;
list_for_each_entry_safe(adapter, tmp, &adapters_list_g, list) {
if (adapter->unique_id == unique_id) {
adapters_count_g--;
list_del_init(&adapter->list);
mraid_mm_free_adp_resources(adapter);
kfree(adapter);
con_log(CL_ANN, (
"megaraid cmm: Unregistered one adapter:%#x\n" ,
unique_id));
return 0 ;
}
}
return (-ENODEV);
}
/**
* mraid_mm_free_adp_resources - Free adapter softstate
* @ adp : Adapter softstate
*/
static void
mraid_mm_free_adp_resources(mraid_mmadp_t *adp)
{
uioc_t *kioc;
int i;
mraid_mm_teardown_dma_pools(adp);
for (i = 0 ; i < adp->max_kioc; i++) {
kioc = adp->kioc_list + i;
dma_pool_free(adp->pthru_dma_pool, kioc->pthru32,
kioc->pthru32_h);
}
kfree(adp->kioc_list);
kfree(adp->mbox_list);
dma_pool_destroy(adp->pthru_dma_pool);
return ;
}
/**
* mraid_mm_teardown_dma_pools - Free all per adapter dma buffers
* @ adp : Adapter softstate
*/
static void
mraid_mm_teardown_dma_pools(mraid_mmadp_t *adp)
{
int i;
mm_dmapool_t *pool;
for (i = 0 ; i < MAX_DMA_POOLS; i++) {
pool = &adp->dma_pool_list[i];
if (pool->handle) {
if (pool->vaddr)
dma_pool_free(pool->handle, pool->vaddr,
pool->paddr);
dma_pool_destroy(pool->handle);
pool->handle = NULL;
}
}
return ;
}
/**
* mraid_mm_init - Module entry point
*/
static int __init
mraid_mm_init(void )
{
int err;
// Announce the driver version
con_log(CL_ANN, (KERN_INFO "megaraid cmm: %s %s\n" ,
LSI_COMMON_MOD_VERSION, LSI_COMMON_MOD_EXT_VERSION));
err = misc_register(&megaraid_mm_dev);
if (err < 0 ) {
con_log(CL_ANN, ("megaraid cmm: cannot register misc device\n" ));
return err;
}
init_waitqueue_head(&wait_q);
INIT_LIST_HEAD(&adapters_list_g);
return 0 ;
}
/**
* mraid_mm_exit - Module exit point
*/
static void __exit
mraid_mm_exit(void )
{
con_log(CL_DLEVEL1 , ("exiting common mod\n" ));
misc_deregister(&megaraid_mm_dev);
}
module_init(mraid_mm_init);
module_exit(mraid_mm_exit);
/* vi: set ts=8 sw=8 tw=78: */
Messung V0.5 in Prozent C=96 H=94 G=94
¤ Dauer der Verarbeitung: 0.20 Sekunden
(vorverarbeitet am 2026-09-29)
¤
*© Formatika GbR, Deutschland
2026-10-10
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