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Factor out alloc and free ioctl subcodes into own functions

This commit is contained in:
Florian Lohoff 2018-07-24 15:33:49 +02:00
parent ced70a7433
commit bf960d88a9
1 changed files with 124 additions and 119 deletions
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243
amifldrv.c
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@ -12,6 +12,7 @@
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/version.h>
#include <linux/uaccess.h>
#define LINUX_PRE_2_6 (LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 0))
#define LINUX_POST_2_6 (LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 0))
@ -86,6 +87,121 @@ int AMI_chrdrv_release(struct inode *inode, struct file *file)
return (0);
}
int AMI_chrdrv_ioctl_alloc(unsigned long arg) {
unsigned long virt_addr;
AMIFL_alloc_params arg_kernel_space;
if (kcount >= 128) {
return -EINVAL;
}
kmalloc_ptr = NULL;
if (!arg || kmalloc_ptr) {
return -EINVAL;
}
copy_from_user((void *) &arg_kernel_space, (void *) arg,
sizeof(AMIFL_alloc_params));
if (arg_kernel_space.size > 128 * 1024) {
return -EINVAL;
}
kmalloc_len = ((arg_kernel_space.size + PAGE_SIZE - 1) & PAGE_MASK);
kmalloc_ptr = kmalloc((kmalloc_len + 2 * PAGE_SIZE), GFP_DMA | GFP_KERNEL);
kmalloc_area =
(int *) (((unsigned long) kmalloc_ptr + PAGE_SIZE - 1) & PAGE_MASK);
for (virt_addr = (unsigned long) kmalloc_area;
virt_addr < (unsigned long) kmalloc_area + kmalloc_len;
virt_addr += PAGE_SIZE) {
mem_map_reserve(virt_to_page(virt_addr));
}
{
int i;
for (i = 0; i < (kmalloc_len / sizeof(int)); ++i) {
kmalloc_area[i] = 0xAFD00000 + i;
}
}
kmalloc_drv[kcount].size = arg_kernel_space.size;
kmalloc_drv[kcount].kmallocptr = kmalloc_ptr;
kmalloc_drv[kcount].kvirtlen = kmalloc_len;
kmalloc_drv[kcount].kvirtadd = kmalloc_area;
kmalloc_drv[kcount].kphysadd =
(void *) ((unsigned long) virt_to_phys(kmalloc_area));
++kcount;
arg_kernel_space.kvirtadd = kmalloc_area;
arg_kernel_space.kphysadd =
(void *) ((unsigned long) virt_to_phys(kmalloc_area));
copy_to_user((void *) arg, (void *) &arg_kernel_space,
sizeof(AMIFL_alloc_params));
return 0;
}
int AMI_chrdrv_ioctl_free(unsigned long arg) {
unsigned long virt_addr;
AMIFL_alloc_params arg_kernel_space;
int isearch = 0;
copy_from_user((void *) &arg_kernel_space, (void *) arg,
sizeof(AMIFL_alloc_params));
if (kcount > 0) {
for (isearch = 0; isearch < kcount; isearch++) {
if (kmalloc_drv[isearch].kphysadd ==
arg_kernel_space.kphysadd)
break;
}
if (isearch >= kcount)
return 0;
kmalloc_ptr = kmalloc_drv[isearch].kmallocptr;
kmalloc_area = kmalloc_drv[isearch].kvirtadd;
kmalloc_len = kmalloc_drv[isearch].kvirtlen;
} else
return 0;
if (kmalloc_ptr) {
for (virt_addr = (unsigned long) kmalloc_area;
virt_addr < (unsigned long) kmalloc_area + kmalloc_len;
virt_addr += PAGE_SIZE) {
mem_map_unreserve(virt_to_page(virt_addr));
}
if (kmalloc_ptr) {
kfree(kmalloc_ptr);
}
kmalloc_len = 0L;
kmalloc_ptr = NULL;
kmalloc_area = NULL;
kcount--;
if (isearch != kcount) {
kmalloc_drv[isearch].size = kmalloc_drv[kcount].size;
kmalloc_drv[isearch].kmallocptr =
kmalloc_drv[kcount].kmallocptr;
kmalloc_drv[isearch].kvirtlen =
kmalloc_drv[kcount].kvirtlen;
kmalloc_drv[isearch].kvirtadd =
kmalloc_drv[kcount].kvirtadd;
kmalloc_drv[isearch].kphysadd =
kmalloc_drv[kcount].kphysadd;
}
kmalloc_drv[kcount].size = 0;
kmalloc_drv[kcount].kmallocptr = NULL;
kmalloc_drv[kcount].kvirtlen = 0;
kmalloc_drv[kcount].kvirtadd = NULL;
kmalloc_drv[kcount].kphysadd = NULL;
}
return 0;
}
#if defined(HAVE_UNLOCKED_IOCTL)
long AMI_chrdrv_ioctl(struct file *_unused_file, unsigned int cmd, unsigned long arg)
#else
@ -93,127 +209,16 @@ int AMI_chrdrv_ioctl(struct inode *_unused_inode, unsigned int cmd, unsigned lon
#endif
{
switch (cmd) {
case CMD_ALLOC:
{
unsigned long virt_addr;
AMIFL_alloc_params arg_kernel_space;
if (kcount >= 128) {
return -EINVAL;
}
kmalloc_ptr = NULL;
if (!arg || kmalloc_ptr) {
return -EINVAL;
}
copy_from_user((void *) &arg_kernel_space, (void *) arg,
sizeof(AMIFL_alloc_params));
if (arg_kernel_space.size > 128 * 1024) {
return -EINVAL;
}
kmalloc_len = ((arg_kernel_space.size + PAGE_SIZE - 1) & PAGE_MASK);
kmalloc_ptr = kmalloc((kmalloc_len + 2 * PAGE_SIZE), GFP_DMA | GFP_KERNEL);
kmalloc_area =
(int *) (((unsigned long) kmalloc_ptr + PAGE_SIZE - 1) & PAGE_MASK);
for (virt_addr = (unsigned long) kmalloc_area;
virt_addr < (unsigned long) kmalloc_area + kmalloc_len;
virt_addr += PAGE_SIZE) {
mem_map_reserve(virt_to_page(virt_addr));
}
{
int i;
for (i = 0; i < (kmalloc_len / sizeof(int)); ++i) {
kmalloc_area[i] = 0xAFD00000 + i;
}
}
kmalloc_drv[kcount].size = arg_kernel_space.size;
kmalloc_drv[kcount].kmallocptr = kmalloc_ptr;
kmalloc_drv[kcount].kvirtlen = kmalloc_len;
kmalloc_drv[kcount].kvirtadd = kmalloc_area;
kmalloc_drv[kcount].kphysadd =
(void *) ((unsigned long) virt_to_phys(kmalloc_area));
++kcount;
arg_kernel_space.kvirtadd = kmalloc_area;
arg_kernel_space.kphysadd =
(void *) ((unsigned long) virt_to_phys(kmalloc_area));
copy_to_user((void *) arg, (void *) &arg_kernel_space,
sizeof(AMIFL_alloc_params));
case CMD_ALLOC:
return AMI_chrdrv_ioctl_alloc(arg);
case CMD_FREE:
return AMI_chrdrv_ioctl_alloc(arg);
case CMD_LOCK_KB:
disable_irq(1);
return 0;
}
case CMD_FREE:
{
unsigned long virt_addr;
AMIFL_alloc_params arg_kernel_space;
int isearch = 0;
copy_from_user((void *) &arg_kernel_space, (void *) arg,
sizeof(AMIFL_alloc_params));
if (kcount > 0) {
for (isearch = 0; isearch < kcount; isearch++) {
if (kmalloc_drv[isearch].kphysadd ==
arg_kernel_space.kphysadd)
break;
}
if (isearch >= kcount)
return 0;
kmalloc_ptr = kmalloc_drv[isearch].kmallocptr;
kmalloc_area = kmalloc_drv[isearch].kvirtadd;
kmalloc_len = kmalloc_drv[isearch].kvirtlen;
} else
return 0;
if (kmalloc_ptr) {
for (virt_addr = (unsigned long) kmalloc_area;
virt_addr < (unsigned long) kmalloc_area + kmalloc_len;
virt_addr += PAGE_SIZE) {
mem_map_unreserve(virt_to_page(virt_addr));
}
if (kmalloc_ptr) {
kfree(kmalloc_ptr);
}
kmalloc_len = 0L;
kmalloc_ptr = NULL;
kmalloc_area = NULL;
kcount--;
if (isearch != kcount) {
kmalloc_drv[isearch].size = kmalloc_drv[kcount].size;
kmalloc_drv[isearch].kmallocptr =
kmalloc_drv[kcount].kmallocptr;
kmalloc_drv[isearch].kvirtlen =
kmalloc_drv[kcount].kvirtlen;
kmalloc_drv[isearch].kvirtadd =
kmalloc_drv[kcount].kvirtadd;
kmalloc_drv[isearch].kphysadd =
kmalloc_drv[kcount].kphysadd;
}
kmalloc_drv[kcount].size = 0;
kmalloc_drv[kcount].kmallocptr = NULL;
kmalloc_drv[kcount].kvirtlen = 0;
kmalloc_drv[kcount].kvirtadd = NULL;
kmalloc_drv[kcount].kphysadd = NULL;
}
case CMD_UNLOCK_KB:
enable_irq(1);
return 0;
}
case CMD_LOCK_KB:
disable_irq(1);
return 0;
case CMD_UNLOCK_KB:
enable_irq(1);
return 0;
}
return -ENOTTY;
}