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staging: tidspbridge - move all iommu related code to a new file

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Create dsp-mmu module and moves all the iommu code related to
this module.

Signed-off-by: Fernando Guzman Lugo <x0095840@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Fernando Guzman Lugo 2010-10-05 15:35:40 -05:00 committed by Greg Kroah-Hartman
parent 053fdb85f5
commit f94378f9f9
7 changed files with 390 additions and 289 deletions
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2
drivers/staging/tidspbridge/Makefile
View File

@ -2,7 +2,7 @@ obj-$(CONFIG_TIDSPBRIDGE) += bridgedriver.o
libgen = gen/gb.o gen/gs.o gen/gh.o gen/uuidutil.o
libcore = core/chnl_sm.o core/msg_sm.o core/io_sm.o core/tiomap3430.o \
core/tiomap3430_pwr.o core/tiomap_io.o \
core/tiomap3430_pwr.o core/tiomap_io.o core/dsp-mmu.o \
core/ue_deh.o core/wdt.o core/dsp-clock.o core/sync.o
libpmgr = pmgr/chnl.o pmgr/io.o pmgr/msg.o pmgr/cod.o pmgr/dev.o pmgr/dspapi.o \
pmgr/dmm.o pmgr/cmm.o pmgr/dbll.o

3
drivers/staging/tidspbridge/core/_deh.h
View File

@ -27,9 +27,6 @@
struct deh_mgr {
struct bridge_dev_context *hbridge_context; /* Bridge context. */
struct ntfy_object *ntfy_obj; /* NTFY object */
/* MMU Fault DPC */
struct tasklet_struct dpc_tasklet;
};
int mmu_fault_isr(struct iommu *mmu);

27
drivers/staging/tidspbridge/core/_tiomap.h
View File

@ -23,8 +23,7 @@
#include <plat/clockdomain.h>
#include <mach-omap2/prm-regbits-34xx.h>
#include <mach-omap2/cm-regbits-34xx.h>
#include <plat/iommu.h>
#include <plat/iovmm.h>
#include <dspbridge/dsp-mmu.h>
#include <dspbridge/devdefs.h>
#include <dspbridge/dspioctl.h> /* for bridge_ioctl_extproc defn */
#include <dspbridge/sync.h>
@ -380,28 +379,4 @@ extern s32 dsp_debug;
*/
int sm_interrupt_dsp(struct bridge_dev_context *dev_context, u16 mb_val);
/**
* user_to_dsp_map() - maps user to dsp virtual address
* @mmu: Pointer to iommu handle.
* @uva: Virtual user space address.
* @da DSP address
* @size Buffer size to map.
* @usr_pgs struct page array pointer where the user pages will be stored
*
* This function maps a user space buffer into DSP virtual address.
*
*/
u32 user_to_dsp_map(struct iommu *mmu, u32 uva, u32 da, u32 size,
struct page **usr_pgs);
/**
* user_to_dsp_unmap() - unmaps DSP virtual buffer.
* @mmu: Pointer to iommu handle.
* @da DSP address
*
* This function unmaps a user space buffer into DSP virtual address.
*
*/
int user_to_dsp_unmap(struct iommu *mmu, u32 da);
#endif /* _TIOMAP_ */

316
drivers/staging/tidspbridge/core/dsp-mmu.c Normal file
View File

@ -0,0 +1,316 @@
/*
* dsp-mmu.c
*
* DSP-BIOS Bridge driver support functions for TI OMAP processors.
*
* DSP iommu.
*
* Copyright (C) 2010 Texas Instruments, Inc.
*
* This package 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.
*
* THIS PACKAGE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#include <dspbridge/host_os.h>
#include <plat/dmtimer.h>
#include <dspbridge/dbdefs.h>
#include <dspbridge/dev.h>
#include <dspbridge/io_sm.h>
#include <dspbridge/dspdeh.h>
#include "_tiomap.h"
#include <dspbridge/dsp-mmu.h>
#define MMU_CNTL_TWL_EN (1 << 2)
static struct tasklet_struct mmu_tasklet;
#ifdef CONFIG_TIDSPBRIDGE_BACKTRACE
static void mmu_fault_print_stack(struct bridge_dev_context *dev_context)
{
void *dummy_addr;
u32 fa, tmp;
struct iotlb_entry e;
struct iommu *mmu = dev_context->dsp_mmu;
dummy_addr = (void *)__get_free_page(GFP_ATOMIC);
/*
* Before acking the MMU fault, let's make sure MMU can only
* access entry #0. Then add a new entry so that the DSP OS
* can continue in order to dump the stack.
*/
tmp = iommu_read_reg(mmu, MMU_CNTL);
tmp &= ~MMU_CNTL_TWL_EN;
iommu_write_reg(mmu, tmp, MMU_CNTL);
fa = iommu_read_reg(mmu, MMU_FAULT_AD);
e.da = fa & PAGE_MASK;
e.pa = virt_to_phys(dummy_addr);
e.valid = 1;
e.prsvd = 1;
e.pgsz = IOVMF_PGSZ_4K & MMU_CAM_PGSZ_MASK;
e.endian = MMU_RAM_ENDIAN_LITTLE;
e.elsz = MMU_RAM_ELSZ_32;
e.mixed = 0;
load_iotlb_entry(mmu, &e);
dsp_clk_enable(DSP_CLK_GPT8);
dsp_gpt_wait_overflow(DSP_CLK_GPT8, 0xfffffffe);
/* Clear MMU interrupt */
tmp = iommu_read_reg(mmu, MMU_IRQSTATUS);
iommu_write_reg(mmu, tmp, MMU_IRQSTATUS);
dump_dsp_stack(dev_context);
dsp_clk_disable(DSP_CLK_GPT8);
iopgtable_clear_entry(mmu, fa);
free_page((unsigned long)dummy_addr);
}
#endif
static void fault_tasklet(unsigned long data)
{
struct iommu *mmu = (struct iommu *)data;
struct bridge_dev_context *dev_ctx;
struct deh_mgr *dm;
u32 fa;
dev_get_deh_mgr(dev_get_first(), &dm);
dev_get_bridge_context(dev_get_first(), &dev_ctx);
if (!dm || !dev_ctx)
return;
fa = iommu_read_reg(mmu, MMU_FAULT_AD);
#ifdef CONFIG_TIDSPBRIDGE_BACKTRACE
print_dsp_trace_buffer(dev_ctx);
dump_dl_modules(dev_ctx);
mmu_fault_print_stack(dev_ctx);
#endif
bridge_deh_notify(dm, DSP_MMUFAULT, fa);
}
/*
* ======== mmu_fault_isr ========
* ISR to be triggered by a DSP MMU fault interrupt.
*/
static int mmu_fault_callback(struct iommu *mmu)
{
if (!mmu)
return -EPERM;
iommu_write_reg(mmu, 0, MMU_IRQENABLE);
tasklet_schedule(&mmu_tasklet);
return 0;
}
/**
* dsp_mmu_init() - initialize dsp_mmu module and returns a handle
*
* This function initialize dsp mmu module and returns a struct iommu
* handle to use it for dsp maps.
*
*/
struct iommu *dsp_mmu_init()
{
struct iommu *mmu;
mmu = iommu_get("iva2");
if (!IS_ERR(mmu)) {
tasklet_init(&mmu_tasklet, fault_tasklet, (unsigned long)mmu);
mmu->isr = mmu_fault_callback;
}
return mmu;
}
/**
* dsp_mmu_exit() - destroy dsp mmu module
* @mmu: Pointer to iommu handle.
*
* This function destroys dsp mmu module.
*
*/
void dsp_mmu_exit(struct iommu *mmu)
{
if (mmu)
iommu_put(mmu);
tasklet_kill(&mmu_tasklet);
}
/**
* user_va2_pa() - get physical address from userspace address.
* @mm: mm_struct Pointer of the process.
* @address: Virtual user space address.
*
*/
static u32 user_va2_pa(struct mm_struct *mm, u32 address)
{
pgd_t *pgd;
pmd_t *pmd;
pte_t *ptep, pte;
pgd = pgd_offset(mm, address);
if (!(pgd_none(*pgd) || pgd_bad(*pgd))) {
pmd = pmd_offset(pgd, address);
if (!(pmd_none(*pmd) || pmd_bad(*pmd))) {
ptep = pte_offset_map(pmd, address);
if (ptep) {
pte = *ptep;
if (pte_present(pte))
return pte & PAGE_MASK;
}
}
}
return 0;
}
/**
* get_io_pages() - pin and get pages of io user's buffer.
* @mm: mm_struct Pointer of the process.
* @uva: Virtual user space address.
* @pages Pages to be pined.
* @usr_pgs struct page array pointer where the user pages will be stored
*
*/
static int get_io_pages(struct mm_struct *mm, u32 uva, unsigned pages,
struct page **usr_pgs)
{
u32 pa;
int i;
struct page *pg;
for (i = 0; i < pages; i++) {
pa = user_va2_pa(mm, uva);
if (!pfn_valid(__phys_to_pfn(pa)))
break;
pg = phys_to_page(pa);
usr_pgs[i] = pg;
get_page(pg);
}
return i;
}
/**
* user_to_dsp_map() - maps user to dsp virtual address
* @mmu: Pointer to iommu handle.
* @uva: Virtual user space address.
* @da DSP address
* @size Buffer size to map.
* @usr_pgs struct page array pointer where the user pages will be stored
*
* This function maps a user space buffer into DSP virtual address.
*
*/
u32 user_to_dsp_map(struct iommu *mmu, u32 uva, u32 da, u32 size,
struct page **usr_pgs)
{
int res, w;
unsigned pages, i;
struct vm_area_struct *vma;
struct mm_struct *mm = current->mm;
struct sg_table *sgt;
struct scatterlist *sg;
if (!size || !usr_pgs)
return -EINVAL;
pages = size / PG_SIZE4K;
down_read(&mm->mmap_sem);
vma = find_vma(mm, uva);
while (vma && (uva + size > vma->vm_end))
vma = find_vma(mm, vma->vm_end + 1);
if (!vma) {
pr_err("%s: Failed to get VMA region for 0x%x (%d)\n",
__func__, uva, size);
up_read(&mm->mmap_sem);
return -EINVAL;
}
if (vma->vm_flags & (VM_WRITE | VM_MAYWRITE))
w = 1;
if (vma->vm_flags & VM_IO)
i = get_io_pages(mm, uva, pages, usr_pgs);
else
i = get_user_pages(current, mm, uva, pages, w, 1,
usr_pgs, NULL);
up_read(&mm->mmap_sem);
if (i < 0)
return i;
if (i < pages) {
res = -EFAULT;
goto err_pages;
}
sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
if (!sgt) {
res = -ENOMEM;
goto err_pages;
}
res = sg_alloc_table(sgt, pages, GFP_KERNEL);
if (res < 0)
goto err_sg;
for_each_sg(sgt->sgl, sg, sgt->nents, i)
sg_set_page(sg, usr_pgs[i], PAGE_SIZE, 0);
da = iommu_vmap(mmu, da, sgt, IOVMF_ENDIAN_LITTLE | IOVMF_ELSZ_32);
if (!IS_ERR_VALUE(da))
return da;
res = (int)da;
sg_free_table(sgt);
err_sg:
kfree(sgt);
i = pages;
err_pages:
while (i--)
put_page(usr_pgs[i]);
return res;
}
/**
* user_to_dsp_unmap() - unmaps DSP virtual buffer.
* @mmu: Pointer to iommu handle.
* @da DSP address
*
* This function unmaps a user space buffer into DSP virtual address.
*
*/
int user_to_dsp_unmap(struct iommu *mmu, u32 da)
{
unsigned i;
struct sg_table *sgt;
struct scatterlist *sg;
sgt = iommu_vunmap(mmu, da);
if (!sgt)
return -EFAULT;
for_each_sg(sgt->sgl, sg, sgt->nents, i)
put_page(sg_page(sg));
sg_free_table(sgt);
kfree(sgt);
return 0;
}

178
drivers/staging/tidspbridge/core/tiomap3430.c
View File

@ -54,7 +54,6 @@
#include "_tiomap.h"
#include "_tiomap_pwr.h"
#include "tiomap_io.h"
#include "_deh.h"
/* Offset in shared mem to write to in order to synchronize start with DSP */
#define SHMSYNCOFFSET 4 /* GPP byte offset */
@ -69,7 +68,6 @@
#define MMU_SMALL_PAGE_MASK 0xFFFFF000
#define OMAP3_IVA2_BOOTADDR_MASK 0xFFFFFC00
#define PAGES_II_LVL_TABLE 512
#define PHYS_TO_PAGE(phys) pfn_to_page((phys) >> PAGE_SHIFT)
/* Forward Declarations: */
static int bridge_brd_monitor(struct bridge_dev_context *dev_ctxt);
@ -354,17 +352,16 @@ static int bridge_brd_start(struct bridge_dev_context *dev_ctxt,
OMAP3430_IVA2_MOD, OMAP2_RM_RSTCTRL);
mmu = dev_context->dsp_mmu;
if (mmu)
iommu_put(mmu);
mmu = iommu_get("iva2");
dsp_mmu_exit(mmu);
mmu = dsp_mmu_init();
if (IS_ERR(mmu)) {
dev_err(bridge, "iommu_get failed!\n");
dev_err(bridge, "dsp_mmu_init failed!\n");
dev_context->dsp_mmu = NULL;
status = (int)mmu;
}
}
if (!status) {
dev_context->dsp_mmu = mmu;
mmu->isr = mmu_fault_isr;
sm_sg = &dev_context->sh_s;
sg0_da = iommu_kmap(mmu, sm_sg->seg0_da, sm_sg->seg0_pa,
sm_sg->seg0_size, IOVMF_ENDIAN_LITTLE | IOVMF_ELSZ_32);
@ -620,7 +617,7 @@ static int bridge_brd_stop(struct bridge_dev_context *dev_ctxt)
}
iommu_kunmap(dev_context->dsp_mmu, dev_context->sh_s.seg0_da);
iommu_kunmap(dev_context->dsp_mmu, dev_context->sh_s.seg1_da);
iommu_put(dev_context->dsp_mmu);
dsp_mmu_exit(dev_context->dsp_mmu);
dev_context->dsp_mmu = NULL;
}
/* Reset IVA IOMMU*/
@ -934,173 +931,6 @@ static int bridge_brd_mem_write(struct bridge_dev_context *dev_ctxt,
return status;
}
/*
* ======== user_va2_pa ========
* Purpose:
* This function walks through the page tables to convert a userland
* virtual address to physical address
*/
static u32 user_va2_pa(struct mm_struct *mm, u32 address)
{
pgd_t *pgd;
pmd_t *pmd;
pte_t *ptep, pte;
pgd = pgd_offset(mm, address);
if (!(pgd_none(*pgd) || pgd_bad(*pgd))) {
pmd = pmd_offset(pgd, address);
if (!(pmd_none(*pmd) || pmd_bad(*pmd))) {
ptep = pte_offset_map(pmd, address);
if (ptep) {
pte = *ptep;
if (pte_present(pte))
return pte & PAGE_MASK;
}
}
}
return 0;
}
/**
* get_io_pages() - pin and get pages of io user's buffer.
* @mm: mm_struct Pointer of the process.
* @uva: Virtual user space address.
* @pages Pages to be pined.
* @usr_pgs struct page array pointer where the user pages will be stored
*
*/
static int get_io_pages(struct mm_struct *mm, u32 uva, unsigned pages,
struct page **usr_pgs)
{
u32 pa;
int i;
struct page *pg;
for (i = 0; i < pages; i++) {
pa = user_va2_pa(mm, uva);
if (!pfn_valid(__phys_to_pfn(pa)))
break;
pg = PHYS_TO_PAGE(pa);
usr_pgs[i] = pg;
get_page(pg);
}
return i;
}
/**
* user_to_dsp_map() - maps user to dsp virtual address
* @mmu: Pointer to iommu handle.
* @uva: Virtual user space address.
* @da DSP address
* @size Buffer size to map.
* @usr_pgs struct page array pointer where the user pages will be stored
*
* This function maps a user space buffer into DSP virtual address.
*
*/
u32 user_to_dsp_map(struct iommu *mmu, u32 uva, u32 da, u32 size,
struct page **usr_pgs)
{
int res, w;
unsigned pages, i;
struct vm_area_struct *vma;
struct mm_struct *mm = current->mm;
struct sg_table *sgt;
struct scatterlist *sg;
if (!size || !usr_pgs)
return -EINVAL;
pages = size / PG_SIZE4K;
down_read(&mm->mmap_sem);
vma = find_vma(mm, uva);
while (vma && (uva + size > vma->vm_end))
vma = find_vma(mm, vma->vm_end + 1);
if (!vma) {
pr_err("%s: Failed to get VMA region for 0x%x (%d)\n",
__func__, uva, size);
up_read(&mm->mmap_sem);
return -EINVAL;
}
if (vma->vm_flags & (VM_WRITE | VM_MAYWRITE))
w = 1;
if (vma->vm_flags & VM_IO)
i = get_io_pages(mm, uva, pages, usr_pgs);
else
i = get_user_pages(current, mm, uva, pages, w, 1,
usr_pgs, NULL);
up_read(&mm->mmap_sem);
if (i < 0)
return i;
if (i < pages) {
res = -EFAULT;
goto err_pages;
}
sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
if (!sgt) {
res = -ENOMEM;
goto err_pages;
}
res = sg_alloc_table(sgt, pages, GFP_KERNEL);
if (res < 0)
goto err_sg;
for_each_sg(sgt->sgl, sg, sgt->nents, i)
sg_set_page(sg, usr_pgs[i], PAGE_SIZE, 0);
da = iommu_vmap(mmu, da, sgt, IOVMF_ENDIAN_LITTLE | IOVMF_ELSZ_32);
if (!IS_ERR_VALUE(da))
return da;
res = (int)da;
sg_free_table(sgt);
err_sg:
kfree(sgt);
i = pages;
err_pages:
while (i--)
put_page(usr_pgs[i]);
return res;
}
/**
* user_to_dsp_unmap() - unmaps DSP virtual buffer.
* @mmu: Pointer to iommu handle.
* @da DSP address
*
* This function unmaps a user space buffer into DSP virtual address.
*
*/
int user_to_dsp_unmap(struct iommu *mmu, u32 da)
{
unsigned i;
struct sg_table *sgt;
struct scatterlist *sg;
sgt = iommu_vunmap(mmu, da);
if (!sgt)
return -EFAULT;
for_each_sg(sgt->sgl, sg, sgt->nents, i)
put_page(sg_page(sg));
sg_free_table(sgt);
kfree(sgt);
return 0;
}
/*
* ======== wait_for_start ========
* Wait for the singal from DSP that it has started, or time out.

86
drivers/staging/tidspbridge/core/ue_deh.c
View File

@ -31,32 +31,6 @@
#include <dspbridge/drv.h>
#include <dspbridge/wdt.h>
#define MMU_CNTL_TWL_EN (1 << 2)
static void mmu_fault_dpc(unsigned long data)
{
struct deh_mgr *deh = (void *)data;
if (!deh)
return;
bridge_deh_notify(deh, DSP_MMUFAULT, 0);
}
int mmu_fault_isr(struct iommu *mmu)
{
struct deh_mgr *dm;
dev_get_deh_mgr(dev_get_first(), &dm);
if (!dm)
return -EPERM;
iommu_write_reg(mmu, 0, MMU_IRQENABLE);
tasklet_schedule(&dm->dpc_tasklet);
return 0;
}
int bridge_deh_create(struct deh_mgr **ret_deh,
struct dev_object *hdev_obj)
{
@ -84,9 +58,6 @@ int bridge_deh_create(struct deh_mgr **ret_deh,
}
ntfy_init(deh->ntfy_obj);
/* Create a MMUfault DPC */
tasklet_init(&deh->dpc_tasklet, mmu_fault_dpc, (u32) deh);
/* Fill in context structure */
deh->hbridge_context = hbridge_context;
@ -110,9 +81,6 @@ int bridge_deh_destroy(struct deh_mgr *deh)
kfree(deh->ntfy_obj);
}
/* Free DPC object */
tasklet_kill(&deh->dpc_tasklet);
/* Deallocate the DEH manager object */
kfree(deh);
@ -133,51 +101,6 @@ int bridge_deh_register_notify(struct deh_mgr *deh, u32 event_mask,
return ntfy_unregister(deh->ntfy_obj, hnotification);
}
#ifdef CONFIG_TIDSPBRIDGE_BACKTRACE
static void mmu_fault_print_stack(struct bridge_dev_context *dev_context)
{
void *dummy_addr;
u32 fa, tmp;
struct iotlb_entry e;
struct iommu *mmu = dev_context->dsp_mmu;
dummy_addr = (void *)__get_free_page(GFP_ATOMIC);
/*
* Before acking the MMU fault, let's make sure MMU can only
* access entry #0. Then add a new entry so that the DSP OS
* can continue in order to dump the stack.
*/
tmp = iommu_read_reg(mmu, MMU_CNTL);
tmp &= ~MMU_CNTL_TWL_EN;
iommu_write_reg(mmu, tmp, MMU_CNTL);
fa = iommu_read_reg(mmu, MMU_FAULT_AD);
e.da = fa & PAGE_MASK;
e.pa = virt_to_phys(dummy_addr);
e.valid = 1;
e.prsvd = 1;
e.pgsz = IOVMF_PGSZ_4K & MMU_CAM_PGSZ_MASK;
e.endian = MMU_RAM_ENDIAN_LITTLE;
e.elsz = MMU_RAM_ELSZ_32;
e.mixed = 0;
load_iotlb_entry(dev_context->dsp_mmu, &e);
dsp_clk_enable(DSP_CLK_GPT8);
dsp_gpt_wait_overflow(DSP_CLK_GPT8, 0xfffffffe);
/* Clear MMU interrupt */
tmp = iommu_read_reg(mmu, MMU_IRQSTATUS);
iommu_write_reg(mmu, tmp, MMU_IRQSTATUS);
dump_dsp_stack(dev_context);
dsp_clk_disable(DSP_CLK_GPT8);
iopgtable_clear_entry(mmu, fa);
free_page((unsigned long)dummy_addr);
}
#endif
static inline const char *event_to_string(int event)
{
switch (event) {
@ -193,7 +116,6 @@ void bridge_deh_notify(struct deh_mgr *deh, int event, int info)
{
struct bridge_dev_context *dev_context;
const char *str = event_to_string(event);
u32 fa;
if (!deh)
return;
@ -211,13 +133,7 @@ void bridge_deh_notify(struct deh_mgr *deh, int event, int info)
#endif
break;
case DSP_MMUFAULT:
fa = iommu_read_reg(dev_context->dsp_mmu, MMU_FAULT_AD);
dev_err(bridge, "%s: %s, addr=0x%x", __func__, str, fa);
#ifdef CONFIG_TIDSPBRIDGE_BACKTRACE
print_dsp_trace_buffer(dev_context);
dump_dl_modules(dev_context);
mmu_fault_print_stack(dev_context);
#endif
dev_err(bridge, "%s: %s, addr=0x%x", __func__, str, info);
break;
default:
dev_err(bridge, "%s: %s", __func__, str);

67
drivers/staging/tidspbridge/include/dspbridge/dsp-mmu.h Normal file
View File

@ -0,0 +1,67 @@
/*
* dsp-mmu.h
*
* DSP-BIOS Bridge driver support functions for TI OMAP processors.
*
* DSP iommu.
*
* Copyright (C) 2005-2010 Texas Instruments, Inc.
*
* This package 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.
*
* THIS PACKAGE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
* WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#ifndef _DSP_MMU_
#define _DSP_MMU_
#include <plat/iommu.h>
#include <plat/iovmm.h>
/**
* dsp_mmu_init() - initialize dsp_mmu module and returns a handle
*
* This function initialize dsp mmu module and returns a struct iommu
* handle to use it for dsp maps.
*
*/
struct iommu *dsp_mmu_init(void);
/**
* dsp_mmu_exit() - destroy dsp mmu module
* @mmu: Pointer to iommu handle.
*
* This function destroys dsp mmu module.
*
*/
void dsp_mmu_exit(struct iommu *mmu);
/**
* user_to_dsp_map() - maps user to dsp virtual address
* @mmu: Pointer to iommu handle.
* @uva: Virtual user space address.
* @da DSP address
* @size Buffer size to map.
* @usr_pgs struct page array pointer where the user pages will be stored
*
* This function maps a user space buffer into DSP virtual address.
*
*/
u32 user_to_dsp_map(struct iommu *mmu, u32 uva, u32 da, u32 size,
struct page **usr_pgs);
/**
* user_to_dsp_unmap() - unmaps DSP virtual buffer.
* @mmu: Pointer to iommu handle.
* @da DSP address
*
* This function unmaps a user space buffer into DSP virtual address.
*
*/
int user_to_dsp_unmap(struct iommu *mmu, u32 da);
#endif