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linux_dsm_epyc7002/drivers/scsi/megaraid/megaraid_mm.c
Kees Cook 6da2ec5605 treewide: kmalloc() -> kmalloc_array() 
The kmalloc() function has a 2-factor argument form, kmalloc_array(). This
patch replaces cases of:

        kmalloc(a * b, gfp)

with:
        kmalloc_array(a * b, gfp)

as well as handling cases of:

        kmalloc(a * b * c, gfp)

with:

        kmalloc(array3_size(a, b, c), gfp)

as it's slightly less ugly than:

        kmalloc_array(array_size(a, b), c, gfp)

This does, however, attempt to ignore constant size factors like:

        kmalloc(4 * 1024, gfp)

though any constants defined via macros get caught up in the conversion.

Any factors with a sizeof() of "unsigned char", "char", and "u8" were
dropped, since they're redundant.

The tools/ directory was manually excluded, since it has its own
implementation of kmalloc().

The Coccinelle script used for this was:

// Fix redundant parens around sizeof().
@@
type TYPE;
expression THING, E;
@@

(
  kmalloc(
-	(sizeof(TYPE)) * E
+	sizeof(TYPE) * E
  , ...)
|
  kmalloc(
-	(sizeof(THING)) * E
+	sizeof(THING) * E
  , ...)
)

// Drop single-byte sizes and redundant parens.
@@
expression COUNT;
typedef u8;
typedef __u8;
@@

(
  kmalloc(
-	sizeof(u8) * (COUNT)
+	COUNT
  , ...)
|
  kmalloc(
-	sizeof(__u8) * (COUNT)
+	COUNT
  , ...)
|
  kmalloc(
-	sizeof(char) * (COUNT)
+	COUNT
  , ...)
|
  kmalloc(
-	sizeof(unsigned char) * (COUNT)
+	COUNT
  , ...)
|
  kmalloc(
-	sizeof(u8) * COUNT
+	COUNT
  , ...)
|
  kmalloc(
-	sizeof(__u8) * COUNT
+	COUNT
  , ...)
|
  kmalloc(
-	sizeof(char) * COUNT
+	COUNT
  , ...)
|
  kmalloc(
-	sizeof(unsigned char) * COUNT
+	COUNT
  , ...)
)

// 2-factor product with sizeof(type/expression) and identifier or constant.
@@
type TYPE;
expression THING;
identifier COUNT_ID;
constant COUNT_CONST;
@@

(
- kmalloc
+ kmalloc_array
  (
-	sizeof(TYPE) * (COUNT_ID)
+	COUNT_ID, sizeof(TYPE)
  , ...)
|
- kmalloc
+ kmalloc_array
  (
-	sizeof(TYPE) * COUNT_ID
+	COUNT_ID, sizeof(TYPE)
  , ...)
|
- kmalloc
+ kmalloc_array
  (
-	sizeof(TYPE) * (COUNT_CONST)
+	COUNT_CONST, sizeof(TYPE)
  , ...)
|
- kmalloc
+ kmalloc_array
  (
-	sizeof(TYPE) * COUNT_CONST
+	COUNT_CONST, sizeof(TYPE)
  , ...)
|
- kmalloc
+ kmalloc_array
  (
-	sizeof(THING) * (COUNT_ID)
+	COUNT_ID, sizeof(THING)
  , ...)
|
- kmalloc
+ kmalloc_array
  (
-	sizeof(THING) * COUNT_ID
+	COUNT_ID, sizeof(THING)
  , ...)
|
- kmalloc
+ kmalloc_array
  (
-	sizeof(THING) * (COUNT_CONST)
+	COUNT_CONST, sizeof(THING)
  , ...)
|
- kmalloc
+ kmalloc_array
  (
-	sizeof(THING) * COUNT_CONST
+	COUNT_CONST, sizeof(THING)
  , ...)
)

// 2-factor product, only identifiers.
@@
identifier SIZE, COUNT;
@@

- kmalloc
+ kmalloc_array
  (
-	SIZE * COUNT
+	COUNT, SIZE
  , ...)

// 3-factor product with 1 sizeof(type) or sizeof(expression), with
// redundant parens removed.
@@
expression THING;
identifier STRIDE, COUNT;
type TYPE;
@@

(
  kmalloc(
-	sizeof(TYPE) * (COUNT) * (STRIDE)
+	array3_size(COUNT, STRIDE, sizeof(TYPE))
  , ...)
|
  kmalloc(
-	sizeof(TYPE) * (COUNT) * STRIDE
+	array3_size(COUNT, STRIDE, sizeof(TYPE))
  , ...)
|
  kmalloc(
-	sizeof(TYPE) * COUNT * (STRIDE)
+	array3_size(COUNT, STRIDE, sizeof(TYPE))
  , ...)
|
  kmalloc(
-	sizeof(TYPE) * COUNT * STRIDE
+	array3_size(COUNT, STRIDE, sizeof(TYPE))
  , ...)
|
  kmalloc(
-	sizeof(THING) * (COUNT) * (STRIDE)
+	array3_size(COUNT, STRIDE, sizeof(THING))
  , ...)
|
  kmalloc(
-	sizeof(THING) * (COUNT) * STRIDE
+	array3_size(COUNT, STRIDE, sizeof(THING))
  , ...)
|
  kmalloc(
-	sizeof(THING) * COUNT * (STRIDE)
+	array3_size(COUNT, STRIDE, sizeof(THING))
  , ...)
|
  kmalloc(
-	sizeof(THING) * COUNT * STRIDE
+	array3_size(COUNT, STRIDE, sizeof(THING))
  , ...)
)

// 3-factor product with 2 sizeof(variable), with redundant parens removed.
@@
expression THING1, THING2;
identifier COUNT;
type TYPE1, TYPE2;
@@

(
  kmalloc(
-	sizeof(TYPE1) * sizeof(TYPE2) * COUNT
+	array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2))
  , ...)
|
  kmalloc(
-	sizeof(TYPE1) * sizeof(THING2) * (COUNT)
+	array3_size(COUNT, sizeof(TYPE1), sizeof(TYPE2))
  , ...)
|
  kmalloc(
-	sizeof(THING1) * sizeof(THING2) * COUNT
+	array3_size(COUNT, sizeof(THING1), sizeof(THING2))
  , ...)
|
  kmalloc(
-	sizeof(THING1) * sizeof(THING2) * (COUNT)
+	array3_size(COUNT, sizeof(THING1), sizeof(THING2))
  , ...)
|
  kmalloc(
-	sizeof(TYPE1) * sizeof(THING2) * COUNT
+	array3_size(COUNT, sizeof(TYPE1), sizeof(THING2))
  , ...)
|
  kmalloc(
-	sizeof(TYPE1) * sizeof(THING2) * (COUNT)
+	array3_size(COUNT, sizeof(TYPE1), sizeof(THING2))
  , ...)
)

// 3-factor product, only identifiers, with redundant parens removed.
@@
identifier STRIDE, SIZE, COUNT;
@@

(
  kmalloc(
-	(COUNT) * STRIDE * SIZE
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  kmalloc(
-	COUNT * (STRIDE) * SIZE
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  kmalloc(
-	COUNT * STRIDE * (SIZE)
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  kmalloc(
-	(COUNT) * (STRIDE) * SIZE
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  kmalloc(
-	COUNT * (STRIDE) * (SIZE)
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  kmalloc(
-	(COUNT) * STRIDE * (SIZE)
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  kmalloc(
-	(COUNT) * (STRIDE) * (SIZE)
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
|
  kmalloc(
-	COUNT * STRIDE * SIZE
+	array3_size(COUNT, STRIDE, SIZE)
  , ...)
)

// Any remaining multi-factor products, first at least 3-factor products,
// when they're not all constants...
@@
expression E1, E2, E3;
constant C1, C2, C3;
@@

(
  kmalloc(C1 * C2 * C3, ...)
|
  kmalloc(
-	(E1) * E2 * E3
+	array3_size(E1, E2, E3)
  , ...)
|
  kmalloc(
-	(E1) * (E2) * E3
+	array3_size(E1, E2, E3)
  , ...)
|
  kmalloc(
-	(E1) * (E2) * (E3)
+	array3_size(E1, E2, E3)
  , ...)
|
  kmalloc(
-	E1 * E2 * E3
+	array3_size(E1, E2, E3)
  , ...)
)

// And then all remaining 2 factors products when they're not all constants,
// keeping sizeof() as the second factor argument.
@@
expression THING, E1, E2;
type TYPE;
constant C1, C2, C3;
@@

(
  kmalloc(sizeof(THING) * C2, ...)
|
  kmalloc(sizeof(TYPE) * C2, ...)
|
  kmalloc(C1 * C2 * C3, ...)
|
  kmalloc(C1 * C2, ...)
|
- kmalloc
+ kmalloc_array
  (
-	sizeof(TYPE) * (E2)
+	E2, sizeof(TYPE)
  , ...)
|
- kmalloc
+ kmalloc_array
  (
-	sizeof(TYPE) * E2
+	E2, sizeof(TYPE)
  , ...)
|
- kmalloc
+ kmalloc_array
  (
-	sizeof(THING) * (E2)
+	E2, sizeof(THING)
  , ...)
|
- kmalloc
+ kmalloc_array
  (
-	sizeof(THING) * E2
+	E2, sizeof(THING)
  , ...)
|
- kmalloc
+ kmalloc_array
  (
-	(E1) * E2
+	E1, E2
  , ...)
|
- kmalloc
+ kmalloc_array
  (
-	(E1) * (E2)
+	E1, E2
  , ...)
|
- kmalloc
+ kmalloc_array
  (
-	E1 * E2
+	E1, E2
  , ...)
)

Signed-off-by: Kees Cook <keescook@chromium.org>
2018-06-12 16:19:22 -07:00

1270 lines
27 KiB
C
Raw Blame History

/*
*
* Linux MegaRAID device driver
*
* Copyright (c) 2003-2004 LSI Logic Corporation.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*
* 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 *);
#ifdef CONFIG_COMPAT
static long mraid_mm_compat_ioctl(struct file *, unsigned int, unsigned long);
#endif
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 = 0x02200207;
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,
#ifdef CONFIG_COMPAT
.compat_ioctl = mraid_mm_compat_ioctl,
#endif
.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
* @inode : inode (ignored)
* @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;
/* inconsistent: mraid_mm_compat_ioctl doesn't take the BKL */
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;
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;
list_for_each_entry(adapter, &adapters_list_g, list) {
if (iterator++ == adapno) break;
}
if (!adapter) {
*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 0x82 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 != 0x82)
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 0x82:
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 0x81:
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 0x80:
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 == 0x82)
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 1K boundary. And the
* data will start 1K 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_attch_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) {
del_timer_sync(&timeout.timer);
destroy_timer_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;
/*
* 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;
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) break;
}
kioc->timedout = 0;
if (adapter) {
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 = from_timer(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 == 0x82) {
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);
if (adapter->pthru_dma_pool)
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 4k, 8k ... 64k buffers.
* We have just one 4k buffer in 4k pool, one 8k buffer in 8k 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;
}
#ifdef CONFIG_COMPAT
/**
* mraid_mm_compat_ioctl - 32bit to 64bit ioctl conversion routine
* @filep : file operations pointer (ignored)
* @cmd : ioctl command
* @arg : user ioctl packet
*/
static long
mraid_mm_compat_ioctl(struct file *filep, unsigned int cmd,
unsigned long arg)
{
int err;
err = mraid_mm_ioctl(filep, cmd, arg);
return err;
}
#endif
/**
* 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: */
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