mirror of https://gitee.com/openkylin/linux.git
859 lines
18 KiB
C
859 lines
18 KiB
C
/**************************************************************************
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* Copyright (c) 2007, Intel Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin St - Fifth Floor, Boston, MA 02110-1301 USA.
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*
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**************************************************************************/
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#include <drm/drmP.h>
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#include "psb_drv.h"
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#include "psb_reg.h"
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/*
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* Code for the SGX MMU:
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*/
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/*
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* clflush on one processor only:
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* clflush should apparently flush the cache line on all processors in an
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* SMP system.
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*/
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/*
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* kmap atomic:
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* The usage of the slots must be completely encapsulated within a spinlock, and
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* no other functions that may be using the locks for other purposed may be
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* called from within the locked region.
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* Since the slots are per processor, this will guarantee that we are the only
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* user.
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*/
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/*
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* TODO: Inserting ptes from an interrupt handler:
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* This may be desirable for some SGX functionality where the GPU can fault in
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* needed pages. For that, we need to make an atomic insert_pages function, that
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* may fail.
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* If it fails, the caller need to insert the page using a workqueue function,
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* but on average it should be fast.
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*/
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struct psb_mmu_driver {
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/* protects driver- and pd structures. Always take in read mode
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* before taking the page table spinlock.
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*/
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struct rw_semaphore sem;
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/* protects page tables, directory tables and pt tables.
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* and pt structures.
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*/
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spinlock_t lock;
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atomic_t needs_tlbflush;
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uint8_t __iomem *register_map;
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struct psb_mmu_pd *default_pd;
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/*uint32_t bif_ctrl;*/
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int has_clflush;
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int clflush_add;
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unsigned long clflush_mask;
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struct drm_psb_private *dev_priv;
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};
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struct psb_mmu_pd;
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struct psb_mmu_pt {
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struct psb_mmu_pd *pd;
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uint32_t index;
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uint32_t count;
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struct page *p;
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uint32_t *v;
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};
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struct psb_mmu_pd {
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struct psb_mmu_driver *driver;
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int hw_context;
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struct psb_mmu_pt **tables;
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struct page *p;
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struct page *dummy_pt;
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struct page *dummy_page;
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uint32_t pd_mask;
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uint32_t invalid_pde;
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uint32_t invalid_pte;
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};
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static inline uint32_t psb_mmu_pt_index(uint32_t offset)
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{
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return (offset >> PSB_PTE_SHIFT) & 0x3FF;
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}
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static inline uint32_t psb_mmu_pd_index(uint32_t offset)
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{
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return offset >> PSB_PDE_SHIFT;
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}
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static inline void psb_clflush(void *addr)
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{
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__asm__ __volatile__("clflush (%0)\n" : : "r"(addr) : "memory");
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}
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static inline void psb_mmu_clflush(struct psb_mmu_driver *driver,
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void *addr)
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{
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if (!driver->has_clflush)
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return;
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mb();
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psb_clflush(addr);
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mb();
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}
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static void psb_page_clflush(struct psb_mmu_driver *driver, struct page* page)
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{
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uint32_t clflush_add = driver->clflush_add >> PAGE_SHIFT;
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uint32_t clflush_count = PAGE_SIZE / clflush_add;
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int i;
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uint8_t *clf;
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clf = kmap_atomic(page, KM_USER0);
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mb();
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for (i = 0; i < clflush_count; ++i) {
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psb_clflush(clf);
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clf += clflush_add;
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}
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mb();
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kunmap_atomic(clf, KM_USER0);
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}
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static void psb_pages_clflush(struct psb_mmu_driver *driver,
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struct page *page[], unsigned long num_pages)
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{
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int i;
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if (!driver->has_clflush)
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return ;
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for (i = 0; i < num_pages; i++)
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psb_page_clflush(driver, *page++);
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}
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static void psb_mmu_flush_pd_locked(struct psb_mmu_driver *driver,
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int force)
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{
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atomic_set(&driver->needs_tlbflush, 0);
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}
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static void psb_mmu_flush_pd(struct psb_mmu_driver *driver, int force)
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{
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down_write(&driver->sem);
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psb_mmu_flush_pd_locked(driver, force);
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up_write(&driver->sem);
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}
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void psb_mmu_flush(struct psb_mmu_driver *driver, int rc_prot)
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{
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if (rc_prot)
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down_write(&driver->sem);
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if (rc_prot)
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up_write(&driver->sem);
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}
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void psb_mmu_set_pd_context(struct psb_mmu_pd *pd, int hw_context)
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{
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/*ttm_tt_cache_flush(&pd->p, 1);*/
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psb_pages_clflush(pd->driver, &pd->p, 1);
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down_write(&pd->driver->sem);
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wmb();
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psb_mmu_flush_pd_locked(pd->driver, 1);
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pd->hw_context = hw_context;
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up_write(&pd->driver->sem);
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}
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static inline unsigned long psb_pd_addr_end(unsigned long addr,
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unsigned long end)
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{
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addr = (addr + PSB_PDE_MASK + 1) & ~PSB_PDE_MASK;
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return (addr < end) ? addr : end;
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}
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static inline uint32_t psb_mmu_mask_pte(uint32_t pfn, int type)
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{
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uint32_t mask = PSB_PTE_VALID;
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if (type & PSB_MMU_CACHED_MEMORY)
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mask |= PSB_PTE_CACHED;
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if (type & PSB_MMU_RO_MEMORY)
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mask |= PSB_PTE_RO;
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if (type & PSB_MMU_WO_MEMORY)
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mask |= PSB_PTE_WO;
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return (pfn << PAGE_SHIFT) | mask;
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}
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struct psb_mmu_pd *psb_mmu_alloc_pd(struct psb_mmu_driver *driver,
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int trap_pagefaults, int invalid_type)
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{
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struct psb_mmu_pd *pd = kmalloc(sizeof(*pd), GFP_KERNEL);
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uint32_t *v;
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int i;
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if (!pd)
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return NULL;
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pd->p = alloc_page(GFP_DMA32);
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if (!pd->p)
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goto out_err1;
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pd->dummy_pt = alloc_page(GFP_DMA32);
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if (!pd->dummy_pt)
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goto out_err2;
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pd->dummy_page = alloc_page(GFP_DMA32);
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if (!pd->dummy_page)
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goto out_err3;
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if (!trap_pagefaults) {
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pd->invalid_pde =
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psb_mmu_mask_pte(page_to_pfn(pd->dummy_pt),
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invalid_type);
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pd->invalid_pte =
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psb_mmu_mask_pte(page_to_pfn(pd->dummy_page),
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invalid_type);
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} else {
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pd->invalid_pde = 0;
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pd->invalid_pte = 0;
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}
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v = kmap(pd->dummy_pt);
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for (i = 0; i < (PAGE_SIZE / sizeof(uint32_t)); ++i)
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v[i] = pd->invalid_pte;
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kunmap(pd->dummy_pt);
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v = kmap(pd->p);
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for (i = 0; i < (PAGE_SIZE / sizeof(uint32_t)); ++i)
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v[i] = pd->invalid_pde;
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kunmap(pd->p);
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clear_page(kmap(pd->dummy_page));
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kunmap(pd->dummy_page);
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pd->tables = vmalloc_user(sizeof(struct psb_mmu_pt *) * 1024);
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if (!pd->tables)
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goto out_err4;
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pd->hw_context = -1;
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pd->pd_mask = PSB_PTE_VALID;
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pd->driver = driver;
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return pd;
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out_err4:
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__free_page(pd->dummy_page);
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out_err3:
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__free_page(pd->dummy_pt);
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out_err2:
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__free_page(pd->p);
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out_err1:
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kfree(pd);
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return NULL;
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}
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void psb_mmu_free_pt(struct psb_mmu_pt *pt)
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{
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__free_page(pt->p);
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kfree(pt);
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}
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void psb_mmu_free_pagedir(struct psb_mmu_pd *pd)
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{
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struct psb_mmu_driver *driver = pd->driver;
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struct psb_mmu_pt *pt;
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int i;
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down_write(&driver->sem);
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if (pd->hw_context != -1)
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psb_mmu_flush_pd_locked(driver, 1);
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/* Should take the spinlock here, but we don't need to do that
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since we have the semaphore in write mode. */
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for (i = 0; i < 1024; ++i) {
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pt = pd->tables[i];
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if (pt)
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psb_mmu_free_pt(pt);
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}
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vfree(pd->tables);
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__free_page(pd->dummy_page);
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__free_page(pd->dummy_pt);
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__free_page(pd->p);
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kfree(pd);
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up_write(&driver->sem);
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}
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static struct psb_mmu_pt *psb_mmu_alloc_pt(struct psb_mmu_pd *pd)
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{
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struct psb_mmu_pt *pt = kmalloc(sizeof(*pt), GFP_KERNEL);
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void *v;
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uint32_t clflush_add = pd->driver->clflush_add >> PAGE_SHIFT;
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uint32_t clflush_count = PAGE_SIZE / clflush_add;
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spinlock_t *lock = &pd->driver->lock;
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uint8_t *clf;
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uint32_t *ptes;
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int i;
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if (!pt)
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return NULL;
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pt->p = alloc_page(GFP_DMA32);
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if (!pt->p) {
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kfree(pt);
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return NULL;
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}
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spin_lock(lock);
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v = kmap_atomic(pt->p, KM_USER0);
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clf = (uint8_t *) v;
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ptes = (uint32_t *) v;
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for (i = 0; i < (PAGE_SIZE / sizeof(uint32_t)); ++i)
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*ptes++ = pd->invalid_pte;
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if (pd->driver->has_clflush && pd->hw_context != -1) {
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mb();
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for (i = 0; i < clflush_count; ++i) {
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psb_clflush(clf);
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clf += clflush_add;
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}
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mb();
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}
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kunmap_atomic(v, KM_USER0);
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spin_unlock(lock);
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pt->count = 0;
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pt->pd = pd;
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pt->index = 0;
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return pt;
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}
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struct psb_mmu_pt *psb_mmu_pt_alloc_map_lock(struct psb_mmu_pd *pd,
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unsigned long addr)
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{
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uint32_t index = psb_mmu_pd_index(addr);
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struct psb_mmu_pt *pt;
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uint32_t *v;
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spinlock_t *lock = &pd->driver->lock;
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spin_lock(lock);
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pt = pd->tables[index];
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while (!pt) {
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spin_unlock(lock);
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pt = psb_mmu_alloc_pt(pd);
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if (!pt)
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return NULL;
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spin_lock(lock);
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if (pd->tables[index]) {
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spin_unlock(lock);
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psb_mmu_free_pt(pt);
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spin_lock(lock);
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pt = pd->tables[index];
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continue;
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}
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v = kmap_atomic(pd->p, KM_USER0);
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pd->tables[index] = pt;
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v[index] = (page_to_pfn(pt->p) << 12) | pd->pd_mask;
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pt->index = index;
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kunmap_atomic((void *) v, KM_USER0);
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if (pd->hw_context != -1) {
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psb_mmu_clflush(pd->driver, (void *) &v[index]);
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atomic_set(&pd->driver->needs_tlbflush, 1);
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}
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}
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pt->v = kmap_atomic(pt->p, KM_USER0);
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return pt;
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}
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static struct psb_mmu_pt *psb_mmu_pt_map_lock(struct psb_mmu_pd *pd,
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unsigned long addr)
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{
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uint32_t index = psb_mmu_pd_index(addr);
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struct psb_mmu_pt *pt;
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spinlock_t *lock = &pd->driver->lock;
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spin_lock(lock);
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pt = pd->tables[index];
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if (!pt) {
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spin_unlock(lock);
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return NULL;
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}
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pt->v = kmap_atomic(pt->p, KM_USER0);
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return pt;
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}
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static void psb_mmu_pt_unmap_unlock(struct psb_mmu_pt *pt)
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{
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struct psb_mmu_pd *pd = pt->pd;
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uint32_t *v;
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kunmap_atomic(pt->v, KM_USER0);
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if (pt->count == 0) {
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v = kmap_atomic(pd->p, KM_USER0);
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v[pt->index] = pd->invalid_pde;
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pd->tables[pt->index] = NULL;
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if (pd->hw_context != -1) {
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psb_mmu_clflush(pd->driver,
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(void *) &v[pt->index]);
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atomic_set(&pd->driver->needs_tlbflush, 1);
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}
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kunmap_atomic(pt->v, KM_USER0);
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spin_unlock(&pd->driver->lock);
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psb_mmu_free_pt(pt);
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return;
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}
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spin_unlock(&pd->driver->lock);
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}
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static inline void psb_mmu_set_pte(struct psb_mmu_pt *pt,
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unsigned long addr, uint32_t pte)
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{
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pt->v[psb_mmu_pt_index(addr)] = pte;
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}
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static inline void psb_mmu_invalidate_pte(struct psb_mmu_pt *pt,
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unsigned long addr)
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{
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pt->v[psb_mmu_pt_index(addr)] = pt->pd->invalid_pte;
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}
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void psb_mmu_mirror_gtt(struct psb_mmu_pd *pd,
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uint32_t mmu_offset, uint32_t gtt_start,
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uint32_t gtt_pages)
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{
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uint32_t *v;
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uint32_t start = psb_mmu_pd_index(mmu_offset);
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struct psb_mmu_driver *driver = pd->driver;
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int num_pages = gtt_pages;
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down_read(&driver->sem);
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spin_lock(&driver->lock);
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v = kmap_atomic(pd->p, KM_USER0);
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v += start;
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while (gtt_pages--) {
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*v++ = gtt_start | pd->pd_mask;
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gtt_start += PAGE_SIZE;
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}
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/*ttm_tt_cache_flush(&pd->p, num_pages);*/
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psb_pages_clflush(pd->driver, &pd->p, num_pages);
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kunmap_atomic(v, KM_USER0);
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spin_unlock(&driver->lock);
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if (pd->hw_context != -1)
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atomic_set(&pd->driver->needs_tlbflush, 1);
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up_read(&pd->driver->sem);
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psb_mmu_flush_pd(pd->driver, 0);
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}
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struct psb_mmu_pd *psb_mmu_get_default_pd(struct psb_mmu_driver *driver)
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{
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struct psb_mmu_pd *pd;
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/* down_read(&driver->sem); */
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pd = driver->default_pd;
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/* up_read(&driver->sem); */
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return pd;
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}
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/* Returns the physical address of the PD shared by sgx/msvdx */
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uint32_t psb_get_default_pd_addr(struct psb_mmu_driver *driver)
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{
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struct psb_mmu_pd *pd;
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pd = psb_mmu_get_default_pd(driver);
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return page_to_pfn(pd->p) << PAGE_SHIFT;
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}
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void psb_mmu_driver_takedown(struct psb_mmu_driver *driver)
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{
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psb_mmu_free_pagedir(driver->default_pd);
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kfree(driver);
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}
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struct psb_mmu_driver *psb_mmu_driver_init(uint8_t __iomem * registers,
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int trap_pagefaults,
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int invalid_type,
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struct drm_psb_private *dev_priv)
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{
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struct psb_mmu_driver *driver;
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driver = kmalloc(sizeof(*driver), GFP_KERNEL);
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if (!driver)
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return NULL;
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driver->dev_priv = dev_priv;
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driver->default_pd = psb_mmu_alloc_pd(driver, trap_pagefaults,
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invalid_type);
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if (!driver->default_pd)
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goto out_err1;
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spin_lock_init(&driver->lock);
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init_rwsem(&driver->sem);
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down_write(&driver->sem);
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driver->register_map = registers;
|
|
atomic_set(&driver->needs_tlbflush, 1);
|
|
|
|
driver->has_clflush = 0;
|
|
|
|
if (boot_cpu_has(X86_FEATURE_CLFLSH)) {
|
|
uint32_t tfms, misc, cap0, cap4, clflush_size;
|
|
|
|
/*
|
|
* clflush size is determined at kernel setup for x86_64
|
|
* but not for i386. We have to do it here.
|
|
*/
|
|
|
|
cpuid(0x00000001, &tfms, &misc, &cap0, &cap4);
|
|
clflush_size = ((misc >> 8) & 0xff) * 8;
|
|
driver->has_clflush = 1;
|
|
driver->clflush_add =
|
|
PAGE_SIZE * clflush_size / sizeof(uint32_t);
|
|
driver->clflush_mask = driver->clflush_add - 1;
|
|
driver->clflush_mask = ~driver->clflush_mask;
|
|
}
|
|
|
|
up_write(&driver->sem);
|
|
return driver;
|
|
|
|
out_err1:
|
|
kfree(driver);
|
|
return NULL;
|
|
}
|
|
|
|
static void psb_mmu_flush_ptes(struct psb_mmu_pd *pd,
|
|
unsigned long address, uint32_t num_pages,
|
|
uint32_t desired_tile_stride,
|
|
uint32_t hw_tile_stride)
|
|
{
|
|
struct psb_mmu_pt *pt;
|
|
uint32_t rows = 1;
|
|
uint32_t i;
|
|
unsigned long addr;
|
|
unsigned long end;
|
|
unsigned long next;
|
|
unsigned long add;
|
|
unsigned long row_add;
|
|
unsigned long clflush_add = pd->driver->clflush_add;
|
|
unsigned long clflush_mask = pd->driver->clflush_mask;
|
|
|
|
if (!pd->driver->has_clflush) {
|
|
/*ttm_tt_cache_flush(&pd->p, num_pages);*/
|
|
psb_pages_clflush(pd->driver, &pd->p, num_pages);
|
|
return;
|
|
}
|
|
|
|
if (hw_tile_stride)
|
|
rows = num_pages / desired_tile_stride;
|
|
else
|
|
desired_tile_stride = num_pages;
|
|
|
|
add = desired_tile_stride << PAGE_SHIFT;
|
|
row_add = hw_tile_stride << PAGE_SHIFT;
|
|
mb();
|
|
for (i = 0; i < rows; ++i) {
|
|
|
|
addr = address;
|
|
end = addr + add;
|
|
|
|
do {
|
|
next = psb_pd_addr_end(addr, end);
|
|
pt = psb_mmu_pt_map_lock(pd, addr);
|
|
if (!pt)
|
|
continue;
|
|
do {
|
|
psb_clflush(&pt->v
|
|
[psb_mmu_pt_index(addr)]);
|
|
} while (addr +=
|
|
clflush_add,
|
|
(addr & clflush_mask) < next);
|
|
|
|
psb_mmu_pt_unmap_unlock(pt);
|
|
} while (addr = next, next != end);
|
|
address += row_add;
|
|
}
|
|
mb();
|
|
}
|
|
|
|
void psb_mmu_remove_pfn_sequence(struct psb_mmu_pd *pd,
|
|
unsigned long address, uint32_t num_pages)
|
|
{
|
|
struct psb_mmu_pt *pt;
|
|
unsigned long addr;
|
|
unsigned long end;
|
|
unsigned long next;
|
|
unsigned long f_address = address;
|
|
|
|
down_read(&pd->driver->sem);
|
|
|
|
addr = address;
|
|
end = addr + (num_pages << PAGE_SHIFT);
|
|
|
|
do {
|
|
next = psb_pd_addr_end(addr, end);
|
|
pt = psb_mmu_pt_alloc_map_lock(pd, addr);
|
|
if (!pt)
|
|
goto out;
|
|
do {
|
|
psb_mmu_invalidate_pte(pt, addr);
|
|
--pt->count;
|
|
} while (addr += PAGE_SIZE, addr < next);
|
|
psb_mmu_pt_unmap_unlock(pt);
|
|
|
|
} while (addr = next, next != end);
|
|
|
|
out:
|
|
if (pd->hw_context != -1)
|
|
psb_mmu_flush_ptes(pd, f_address, num_pages, 1, 1);
|
|
|
|
up_read(&pd->driver->sem);
|
|
|
|
if (pd->hw_context != -1)
|
|
psb_mmu_flush(pd->driver, 0);
|
|
|
|
return;
|
|
}
|
|
|
|
void psb_mmu_remove_pages(struct psb_mmu_pd *pd, unsigned long address,
|
|
uint32_t num_pages, uint32_t desired_tile_stride,
|
|
uint32_t hw_tile_stride)
|
|
{
|
|
struct psb_mmu_pt *pt;
|
|
uint32_t rows = 1;
|
|
uint32_t i;
|
|
unsigned long addr;
|
|
unsigned long end;
|
|
unsigned long next;
|
|
unsigned long add;
|
|
unsigned long row_add;
|
|
unsigned long f_address = address;
|
|
|
|
if (hw_tile_stride)
|
|
rows = num_pages / desired_tile_stride;
|
|
else
|
|
desired_tile_stride = num_pages;
|
|
|
|
add = desired_tile_stride << PAGE_SHIFT;
|
|
row_add = hw_tile_stride << PAGE_SHIFT;
|
|
|
|
/* down_read(&pd->driver->sem); */
|
|
|
|
/* Make sure we only need to flush this processor's cache */
|
|
|
|
for (i = 0; i < rows; ++i) {
|
|
|
|
addr = address;
|
|
end = addr + add;
|
|
|
|
do {
|
|
next = psb_pd_addr_end(addr, end);
|
|
pt = psb_mmu_pt_map_lock(pd, addr);
|
|
if (!pt)
|
|
continue;
|
|
do {
|
|
psb_mmu_invalidate_pte(pt, addr);
|
|
--pt->count;
|
|
|
|
} while (addr += PAGE_SIZE, addr < next);
|
|
psb_mmu_pt_unmap_unlock(pt);
|
|
|
|
} while (addr = next, next != end);
|
|
address += row_add;
|
|
}
|
|
if (pd->hw_context != -1)
|
|
psb_mmu_flush_ptes(pd, f_address, num_pages,
|
|
desired_tile_stride, hw_tile_stride);
|
|
|
|
/* up_read(&pd->driver->sem); */
|
|
|
|
if (pd->hw_context != -1)
|
|
psb_mmu_flush(pd->driver, 0);
|
|
}
|
|
|
|
int psb_mmu_insert_pfn_sequence(struct psb_mmu_pd *pd, uint32_t start_pfn,
|
|
unsigned long address, uint32_t num_pages,
|
|
int type)
|
|
{
|
|
struct psb_mmu_pt *pt;
|
|
uint32_t pte;
|
|
unsigned long addr;
|
|
unsigned long end;
|
|
unsigned long next;
|
|
unsigned long f_address = address;
|
|
int ret = 0;
|
|
|
|
down_read(&pd->driver->sem);
|
|
|
|
addr = address;
|
|
end = addr + (num_pages << PAGE_SHIFT);
|
|
|
|
do {
|
|
next = psb_pd_addr_end(addr, end);
|
|
pt = psb_mmu_pt_alloc_map_lock(pd, addr);
|
|
if (!pt) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
do {
|
|
pte = psb_mmu_mask_pte(start_pfn++, type);
|
|
psb_mmu_set_pte(pt, addr, pte);
|
|
pt->count++;
|
|
} while (addr += PAGE_SIZE, addr < next);
|
|
psb_mmu_pt_unmap_unlock(pt);
|
|
|
|
} while (addr = next, next != end);
|
|
|
|
out:
|
|
if (pd->hw_context != -1)
|
|
psb_mmu_flush_ptes(pd, f_address, num_pages, 1, 1);
|
|
|
|
up_read(&pd->driver->sem);
|
|
|
|
if (pd->hw_context != -1)
|
|
psb_mmu_flush(pd->driver, 1);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int psb_mmu_insert_pages(struct psb_mmu_pd *pd, struct page **pages,
|
|
unsigned long address, uint32_t num_pages,
|
|
uint32_t desired_tile_stride,
|
|
uint32_t hw_tile_stride, int type)
|
|
{
|
|
struct psb_mmu_pt *pt;
|
|
uint32_t rows = 1;
|
|
uint32_t i;
|
|
uint32_t pte;
|
|
unsigned long addr;
|
|
unsigned long end;
|
|
unsigned long next;
|
|
unsigned long add;
|
|
unsigned long row_add;
|
|
unsigned long f_address = address;
|
|
int ret = 0;
|
|
|
|
if (hw_tile_stride) {
|
|
if (num_pages % desired_tile_stride != 0)
|
|
return -EINVAL;
|
|
rows = num_pages / desired_tile_stride;
|
|
} else {
|
|
desired_tile_stride = num_pages;
|
|
}
|
|
|
|
add = desired_tile_stride << PAGE_SHIFT;
|
|
row_add = hw_tile_stride << PAGE_SHIFT;
|
|
|
|
down_read(&pd->driver->sem);
|
|
|
|
for (i = 0; i < rows; ++i) {
|
|
|
|
addr = address;
|
|
end = addr + add;
|
|
|
|
do {
|
|
next = psb_pd_addr_end(addr, end);
|
|
pt = psb_mmu_pt_alloc_map_lock(pd, addr);
|
|
if (!pt) {
|
|
ret = -ENOMEM;
|
|
goto out;
|
|
}
|
|
do {
|
|
pte =
|
|
psb_mmu_mask_pte(page_to_pfn(*pages++),
|
|
type);
|
|
psb_mmu_set_pte(pt, addr, pte);
|
|
pt->count++;
|
|
} while (addr += PAGE_SIZE, addr < next);
|
|
psb_mmu_pt_unmap_unlock(pt);
|
|
|
|
} while (addr = next, next != end);
|
|
|
|
address += row_add;
|
|
}
|
|
out:
|
|
if (pd->hw_context != -1)
|
|
psb_mmu_flush_ptes(pd, f_address, num_pages,
|
|
desired_tile_stride, hw_tile_stride);
|
|
|
|
up_read(&pd->driver->sem);
|
|
|
|
if (pd->hw_context != -1)
|
|
psb_mmu_flush(pd->driver, 1);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int psb_mmu_virtual_to_pfn(struct psb_mmu_pd *pd, uint32_t virtual,
|
|
unsigned long *pfn)
|
|
{
|
|
int ret;
|
|
struct psb_mmu_pt *pt;
|
|
uint32_t tmp;
|
|
spinlock_t *lock = &pd->driver->lock;
|
|
|
|
down_read(&pd->driver->sem);
|
|
pt = psb_mmu_pt_map_lock(pd, virtual);
|
|
if (!pt) {
|
|
uint32_t *v;
|
|
|
|
spin_lock(lock);
|
|
v = kmap_atomic(pd->p, KM_USER0);
|
|
tmp = v[psb_mmu_pd_index(virtual)];
|
|
kunmap_atomic(v, KM_USER0);
|
|
spin_unlock(lock);
|
|
|
|
if (tmp != pd->invalid_pde || !(tmp & PSB_PTE_VALID) ||
|
|
!(pd->invalid_pte & PSB_PTE_VALID)) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
ret = 0;
|
|
*pfn = pd->invalid_pte >> PAGE_SHIFT;
|
|
goto out;
|
|
}
|
|
tmp = pt->v[psb_mmu_pt_index(virtual)];
|
|
if (!(tmp & PSB_PTE_VALID)) {
|
|
ret = -EINVAL;
|
|
} else {
|
|
ret = 0;
|
|
*pfn = tmp >> PAGE_SHIFT;
|
|
}
|
|
psb_mmu_pt_unmap_unlock(pt);
|
|
out:
|
|
up_read(&pd->driver->sem);
|
|
return ret;
|
|
}
|