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Subject[PATCHv3 07/11] staging: tidspbridge - move all iommu related code to a new file
Date
Create dsp-mmu module and moves all the iommu code related to
this module.

Signed-off-by: Fernando Guzman Lugo <x0095840@ti.com>
---
drivers/staging/tidspbridge/Makefile | 2 +-
drivers/staging/tidspbridge/core/_deh.h | 3 -
drivers/staging/tidspbridge/core/_tiomap.h | 27 +--
drivers/staging/tidspbridge/core/dsp-mmu.c | 316 ++++++++++++++++++++
drivers/staging/tidspbridge/core/tiomap3430.c | 178 +-----------
drivers/staging/tidspbridge/core/ue_deh.c | 86 +------
.../tidspbridge/include/dspbridge/dsp-mmu.h | 67 ++++
7 files changed, 390 insertions(+), 289 deletions(-)
create mode 100644 drivers/staging/tidspbridge/core/dsp-mmu.c
create mode 100644 drivers/staging/tidspbridge/include/dspbridge/dsp-mmu.h
diff --git a/drivers/staging/tidspbridge/Makefile b/drivers/staging/tidspbridge/Makefile
index e09547d..bd36651 100644
--- a/drivers/staging/tidspbridge/Makefile
+++ b/drivers/staging/tidspbridge/Makefile
@@ -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
diff --git a/drivers/staging/tidspbridge/core/_deh.h b/drivers/staging/tidspbridge/core/_deh.h
index f1254f0..8ae2633 100644
--- a/drivers/staging/tidspbridge/core/_deh.h
+++ b/drivers/staging/tidspbridge/core/_deh.h
@@ -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);
diff --git a/drivers/staging/tidspbridge/core/_tiomap.h b/drivers/staging/tidspbridge/core/_tiomap.h
index cd7ff88..e0a801c 100644
--- a/drivers/staging/tidspbridge/core/_tiomap.h
+++ b/drivers/staging/tidspbridge/core/_tiomap.h
@@ -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_ */
diff --git a/drivers/staging/tidspbridge/core/dsp-mmu.c b/drivers/staging/tidspbridge/core/dsp-mmu.c
new file mode 100644
index 0000000..3c978f9
--- /dev/null
+++ b/drivers/staging/tidspbridge/core/dsp-mmu.c
@@ -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;
+}
diff --git a/drivers/staging/tidspbridge/core/tiomap3430.c b/drivers/staging/tidspbridge/core/tiomap3430.c
index 8496c83..4927ec3 100644
--- a/drivers/staging/tidspbridge/core/tiomap3430.c
+++ b/drivers/staging/tidspbridge/core/tiomap3430.c
@@ -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*/
@@ -935,173 +932,6 @@ static int bridge_brd_mem_write(struct bridge_dev_context *dev_ctxt,
}

/*
- * ======== 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.
*/
diff --git a/drivers/staging/tidspbridge/core/ue_deh.c b/drivers/staging/tidspbridge/core/ue_deh.c
index 2e1ac89..e24ea0c 100644
--- a/drivers/staging/tidspbridge/core/ue_deh.c
+++ b/drivers/staging/tidspbridge/core/ue_deh.c
@@ -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);
diff --git a/drivers/staging/tidspbridge/include/dspbridge/dsp-mmu.h b/drivers/staging/tidspbridge/include/dspbridge/dsp-mmu.h
new file mode 100644
index 0000000..cb38d4c
--- /dev/null
+++ b/drivers/staging/tidspbridge/include/dspbridge/dsp-mmu.h
@@ -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
--
1.6.3.3


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