diff options
Diffstat (limited to 'drivers/staging/tidspbridge/core/dsp-mmu.c')
| -rw-r--r-- | drivers/staging/tidspbridge/core/dsp-mmu.c | 317 |
1 files changed, 0 insertions, 317 deletions
diff --git a/drivers/staging/tidspbridge/core/dsp-mmu.c b/drivers/staging/tidspbridge/core/dsp-mmu.c deleted file mode 100644 index 983c95adc8ff..000000000000 --- a/drivers/staging/tidspbridge/core/dsp-mmu.c +++ /dev/null @@ -1,317 +0,0 @@ -/* - * 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; - int 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; -} |