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add free dma buffer function

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This commit is contained in:
simin
2012-12-13 17:47:36 +09:00
parent 84ade197f0
commit 9849cf57b1
3 changed files with 49 additions and 3 deletions
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10
linux/include/uprotocol.h
View File

@@ -9,6 +9,7 @@
#define MCEXEC_UP_LOAD_SYSCALL 0x30a02905
#define MCEXEC_UP_PREPARE_DMA 0x30a02910
#define MCEXEC_UP_FREE_DMA 0x30a02911
struct program_transfer {
unsigned long dest;
@@ -72,4 +73,13 @@ struct syscall_ret_desc {
unsigned long size;
};
struct prepare_dma_desc {
unsigned long size;
unsigned long pa;
};
struct free_dma_desc {
unsigned long pa;
unsigned long size;
};
#endif

41
linux/mod_mcctrl/control.c
View File

@@ -3,6 +3,7 @@
#include <linux/slab.h>
#include <linux/wait.h>
#include <linux/mm.h>
#include <linux/gfp.h>
#include <asm/uaccess.h>
#include <asm/delay.h>
#include <asm/msr.h>
@@ -289,24 +290,56 @@ int mcexec_wait_syscall(aal_os_t os, struct syscall_wait_desc *__user req)
return 0;
}
long mcexec_pin_region(aal_os_t os, unsigned long *__user uaddress)
long mcexec_pin_region(aal_os_t os, unsigned long *__user arg)
{
struct prepare_dma_desc desc;
int pin_shift = 16;
int order;
unsigned long a;
a = __get_free_pages(GFP_KERNEL, pin_shift - PAGE_SHIFT);
if (copy_from_user(&desc, arg, sizeof(struct prepare_dma_desc))) {
return -EFAULT;
}
order = pin_shift - PAGE_SHIFT;
if(desc.size > 0){
order = get_order (desc.size);
}
a = __get_free_pages(GFP_KERNEL, order);
if (!a) {
return -ENOMEM;
}
a = virt_to_phys((void *)a);
if (copy_to_user(uaddress, &a, sizeof(unsigned long))) {
if (copy_to_user((void*)desc.pa, &a, sizeof(unsigned long))) {
return -EFAULT;
}
return 0;
}
long mcexec_free_region(aal_os_t os, unsigned long *__user arg)
{
struct free_dma_desc desc;
int pin_shift = 16;
int order;
if (copy_from_user(&desc, arg, sizeof(struct free_dma_desc))) {
return -EFAULT;
}
order = pin_shift - PAGE_SHIFT;
if(desc.size > 0){
order = get_order (desc.size);
}
if(desc.pa > 0){
free_pages((unsigned long)phys_to_virt(desc.pa), order);
}
return 0;
}
long mcexec_load_syscall(aal_os_t os, struct syscall_load_desc *__user arg)
{
struct syscall_load_desc desc;
@@ -463,6 +496,8 @@ long __mcctrl_control(aal_os_t os, unsigned int req, unsigned long arg)
case MCEXEC_UP_PREPARE_DMA:
return mcexec_pin_region(os, (unsigned long *)arg);
case MCEXEC_UP_FREE_DMA:
return mcexec_free_region(os, (unsigned long *)arg);
}
return -EINVAL;
}

1
linux/mod_mcctrl/driver.c
View File

@@ -28,6 +28,7 @@ static struct aal_os_user_call_handler mcctrl_uchs[] = {
{ .request = MCEXEC_UP_RET_SYSCALL, .func = mcctrl_ioctl },
{ .request = MCEXEC_UP_LOAD_SYSCALL, .func = mcctrl_ioctl },
{ .request = MCEXEC_UP_PREPARE_DMA, .func = mcctrl_ioctl },
{ .request = MCEXEC_UP_FREE_DMA, .func = mcctrl_ioctl },
};
static struct aal_os_user_call mcctrl_uc = {