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c67e62790f
Mapping the imported pages of a DMA-buf into an userspace process doesn't work as expected. But we have reoccurring requests on this approach, so split the functions for this and document that dma_buf_mmap() needs to be used instead. v2: split it into two functions v3: rebased on latest changes v4: update commit message a bit Signed-off-by: Christian König <christian.koenig@amd.com> Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: https://patchwork.freedesktop.org/patch/403838/
1434 lines
37 KiB
C
1434 lines
37 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Copyright (C) 2011 Texas Instruments Incorporated - https://www.ti.com/
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* Author: Rob Clark <rob.clark@linaro.org>
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*/
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#include <linux/dma-mapping.h>
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#include <linux/seq_file.h>
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#include <linux/shmem_fs.h>
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#include <linux/spinlock.h>
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#include <linux/pfn_t.h>
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#include <drm/drm_prime.h>
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#include <drm/drm_vma_manager.h>
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#include "omap_drv.h"
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#include "omap_dmm_tiler.h"
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/*
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* GEM buffer object implementation.
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*/
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/* note: we use upper 8 bits of flags for driver-internal flags: */
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#define OMAP_BO_MEM_DMA_API 0x01000000 /* memory allocated with the dma_alloc_* API */
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#define OMAP_BO_MEM_SHMEM 0x02000000 /* memory allocated through shmem backing */
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#define OMAP_BO_MEM_DMABUF 0x08000000 /* memory imported from a dmabuf */
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struct omap_gem_object {
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struct drm_gem_object base;
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struct list_head mm_list;
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u32 flags;
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/** width/height for tiled formats (rounded up to slot boundaries) */
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u16 width, height;
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/** roll applied when mapping to DMM */
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u32 roll;
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/** protects dma_addr_cnt, block, pages, dma_addrs and vaddr */
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struct mutex lock;
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/**
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* dma_addr contains the buffer DMA address. It is valid for
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*
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* - buffers allocated through the DMA mapping API (with the
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* OMAP_BO_MEM_DMA_API flag set)
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*
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* - buffers imported from dmabuf (with the OMAP_BO_MEM_DMABUF flag set)
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* if they are physically contiguous (when sgt->orig_nents == 1)
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*
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* - buffers mapped through the TILER when dma_addr_cnt is not zero, in
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* which case the DMA address points to the TILER aperture
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*
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* Physically contiguous buffers have their DMA address equal to the
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* physical address as we don't remap those buffers through the TILER.
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*
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* Buffers mapped to the TILER have their DMA address pointing to the
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* TILER aperture. As TILER mappings are refcounted (through
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* dma_addr_cnt) the DMA address must be accessed through omap_gem_pin()
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* to ensure that the mapping won't disappear unexpectedly. References
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* must be released with omap_gem_unpin().
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*/
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dma_addr_t dma_addr;
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/**
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* # of users of dma_addr
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*/
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refcount_t dma_addr_cnt;
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/**
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* If the buffer has been imported from a dmabuf the OMAP_DB_DMABUF flag
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* is set and the sgt field is valid.
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*/
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struct sg_table *sgt;
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/**
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* tiler block used when buffer is remapped in DMM/TILER.
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*/
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struct tiler_block *block;
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/**
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* Array of backing pages, if allocated. Note that pages are never
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* allocated for buffers originally allocated from contiguous memory
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*/
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struct page **pages;
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/** addresses corresponding to pages in above array */
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dma_addr_t *dma_addrs;
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/**
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* Virtual address, if mapped.
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*/
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void *vaddr;
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};
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#define to_omap_bo(x) container_of(x, struct omap_gem_object, base)
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/* To deal with userspace mmap'ings of 2d tiled buffers, which (a) are
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* not necessarily pinned in TILER all the time, and (b) when they are
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* they are not necessarily page aligned, we reserve one or more small
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* regions in each of the 2d containers to use as a user-GART where we
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* can create a second page-aligned mapping of parts of the buffer
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* being accessed from userspace.
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*
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* Note that we could optimize slightly when we know that multiple
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* tiler containers are backed by the same PAT.. but I'll leave that
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* for later..
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*/
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#define NUM_USERGART_ENTRIES 2
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struct omap_drm_usergart_entry {
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struct tiler_block *block; /* the reserved tiler block */
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dma_addr_t dma_addr;
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struct drm_gem_object *obj; /* the current pinned obj */
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pgoff_t obj_pgoff; /* page offset of obj currently
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mapped in */
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};
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struct omap_drm_usergart {
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struct omap_drm_usergart_entry entry[NUM_USERGART_ENTRIES];
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int height; /* height in rows */
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int height_shift; /* ilog2(height in rows) */
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int slot_shift; /* ilog2(width per slot) */
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int stride_pfn; /* stride in pages */
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int last; /* index of last used entry */
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};
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/* -----------------------------------------------------------------------------
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* Helpers
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*/
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/** get mmap offset */
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u64 omap_gem_mmap_offset(struct drm_gem_object *obj)
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{
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struct drm_device *dev = obj->dev;
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int ret;
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size_t size;
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/* Make it mmapable */
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size = omap_gem_mmap_size(obj);
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ret = drm_gem_create_mmap_offset_size(obj, size);
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if (ret) {
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dev_err(dev->dev, "could not allocate mmap offset\n");
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return 0;
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}
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return drm_vma_node_offset_addr(&obj->vma_node);
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}
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static bool omap_gem_is_contiguous(struct omap_gem_object *omap_obj)
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{
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if (omap_obj->flags & OMAP_BO_MEM_DMA_API)
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return true;
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if ((omap_obj->flags & OMAP_BO_MEM_DMABUF) && omap_obj->sgt->nents == 1)
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return true;
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return false;
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}
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/* -----------------------------------------------------------------------------
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* Eviction
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*/
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static void omap_gem_evict_entry(struct drm_gem_object *obj,
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enum tiler_fmt fmt, struct omap_drm_usergart_entry *entry)
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{
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struct omap_gem_object *omap_obj = to_omap_bo(obj);
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struct omap_drm_private *priv = obj->dev->dev_private;
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int n = priv->usergart[fmt].height;
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size_t size = PAGE_SIZE * n;
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loff_t off = omap_gem_mmap_offset(obj) +
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(entry->obj_pgoff << PAGE_SHIFT);
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const int m = DIV_ROUND_UP(omap_obj->width << fmt, PAGE_SIZE);
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if (m > 1) {
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int i;
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/* if stride > than PAGE_SIZE then sparse mapping: */
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for (i = n; i > 0; i--) {
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unmap_mapping_range(obj->dev->anon_inode->i_mapping,
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off, PAGE_SIZE, 1);
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off += PAGE_SIZE * m;
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}
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} else {
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unmap_mapping_range(obj->dev->anon_inode->i_mapping,
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off, size, 1);
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}
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entry->obj = NULL;
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}
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/* Evict a buffer from usergart, if it is mapped there */
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static void omap_gem_evict(struct drm_gem_object *obj)
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{
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struct omap_gem_object *omap_obj = to_omap_bo(obj);
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struct omap_drm_private *priv = obj->dev->dev_private;
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if (omap_obj->flags & OMAP_BO_TILED_MASK) {
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enum tiler_fmt fmt = gem2fmt(omap_obj->flags);
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int i;
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for (i = 0; i < NUM_USERGART_ENTRIES; i++) {
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struct omap_drm_usergart_entry *entry =
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&priv->usergart[fmt].entry[i];
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if (entry->obj == obj)
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omap_gem_evict_entry(obj, fmt, entry);
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}
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}
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}
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/* -----------------------------------------------------------------------------
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* Page Management
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*/
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/*
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* Ensure backing pages are allocated. Must be called with the omap_obj.lock
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* held.
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*/
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static int omap_gem_attach_pages(struct drm_gem_object *obj)
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{
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struct drm_device *dev = obj->dev;
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struct omap_gem_object *omap_obj = to_omap_bo(obj);
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struct page **pages;
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int npages = obj->size >> PAGE_SHIFT;
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int i, ret;
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dma_addr_t *addrs;
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lockdep_assert_held(&omap_obj->lock);
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/*
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* If not using shmem (in which case backing pages don't need to be
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* allocated) or if pages are already allocated we're done.
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*/
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if (!(omap_obj->flags & OMAP_BO_MEM_SHMEM) || omap_obj->pages)
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return 0;
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pages = drm_gem_get_pages(obj);
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if (IS_ERR(pages)) {
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dev_err(obj->dev->dev, "could not get pages: %ld\n", PTR_ERR(pages));
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return PTR_ERR(pages);
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}
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/* for non-cached buffers, ensure the new pages are clean because
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* DSS, GPU, etc. are not cache coherent:
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*/
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if (omap_obj->flags & (OMAP_BO_WC|OMAP_BO_UNCACHED)) {
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addrs = kmalloc_array(npages, sizeof(*addrs), GFP_KERNEL);
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if (!addrs) {
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ret = -ENOMEM;
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goto free_pages;
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}
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for (i = 0; i < npages; i++) {
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addrs[i] = dma_map_page(dev->dev, pages[i],
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0, PAGE_SIZE, DMA_TO_DEVICE);
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if (dma_mapping_error(dev->dev, addrs[i])) {
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dev_warn(dev->dev,
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"%s: failed to map page\n", __func__);
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for (i = i - 1; i >= 0; --i) {
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dma_unmap_page(dev->dev, addrs[i],
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PAGE_SIZE, DMA_TO_DEVICE);
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}
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ret = -ENOMEM;
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goto free_addrs;
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}
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}
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} else {
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addrs = kcalloc(npages, sizeof(*addrs), GFP_KERNEL);
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if (!addrs) {
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ret = -ENOMEM;
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goto free_pages;
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}
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}
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omap_obj->dma_addrs = addrs;
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omap_obj->pages = pages;
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return 0;
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free_addrs:
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kfree(addrs);
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free_pages:
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drm_gem_put_pages(obj, pages, true, false);
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return ret;
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}
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/* Release backing pages. Must be called with the omap_obj.lock held. */
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static void omap_gem_detach_pages(struct drm_gem_object *obj)
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{
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struct omap_gem_object *omap_obj = to_omap_bo(obj);
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unsigned int npages = obj->size >> PAGE_SHIFT;
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unsigned int i;
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lockdep_assert_held(&omap_obj->lock);
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for (i = 0; i < npages; i++) {
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if (omap_obj->dma_addrs[i])
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dma_unmap_page(obj->dev->dev, omap_obj->dma_addrs[i],
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PAGE_SIZE, DMA_TO_DEVICE);
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}
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kfree(omap_obj->dma_addrs);
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omap_obj->dma_addrs = NULL;
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drm_gem_put_pages(obj, omap_obj->pages, true, false);
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omap_obj->pages = NULL;
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}
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/* get buffer flags */
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u32 omap_gem_flags(struct drm_gem_object *obj)
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{
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return to_omap_bo(obj)->flags;
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}
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/** get mmap size */
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size_t omap_gem_mmap_size(struct drm_gem_object *obj)
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{
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struct omap_gem_object *omap_obj = to_omap_bo(obj);
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size_t size = obj->size;
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if (omap_obj->flags & OMAP_BO_TILED_MASK) {
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/* for tiled buffers, the virtual size has stride rounded up
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* to 4kb.. (to hide the fact that row n+1 might start 16kb or
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* 32kb later!). But we don't back the entire buffer with
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* pages, only the valid picture part.. so need to adjust for
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* this in the size used to mmap and generate mmap offset
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*/
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size = tiler_vsize(gem2fmt(omap_obj->flags),
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omap_obj->width, omap_obj->height);
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}
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return size;
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}
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/* -----------------------------------------------------------------------------
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* Fault Handling
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*/
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/* Normal handling for the case of faulting in non-tiled buffers */
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static vm_fault_t omap_gem_fault_1d(struct drm_gem_object *obj,
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struct vm_area_struct *vma, struct vm_fault *vmf)
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{
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struct omap_gem_object *omap_obj = to_omap_bo(obj);
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unsigned long pfn;
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pgoff_t pgoff;
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/* We don't use vmf->pgoff since that has the fake offset: */
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pgoff = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
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if (omap_obj->pages) {
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omap_gem_cpu_sync_page(obj, pgoff);
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pfn = page_to_pfn(omap_obj->pages[pgoff]);
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} else {
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BUG_ON(!omap_gem_is_contiguous(omap_obj));
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pfn = (omap_obj->dma_addr >> PAGE_SHIFT) + pgoff;
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}
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VERB("Inserting %p pfn %lx, pa %lx", (void *)vmf->address,
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pfn, pfn << PAGE_SHIFT);
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return vmf_insert_mixed(vma, vmf->address,
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__pfn_to_pfn_t(pfn, PFN_DEV));
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}
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/* Special handling for the case of faulting in 2d tiled buffers */
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static vm_fault_t omap_gem_fault_2d(struct drm_gem_object *obj,
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struct vm_area_struct *vma, struct vm_fault *vmf)
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{
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struct omap_gem_object *omap_obj = to_omap_bo(obj);
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struct omap_drm_private *priv = obj->dev->dev_private;
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struct omap_drm_usergart_entry *entry;
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enum tiler_fmt fmt = gem2fmt(omap_obj->flags);
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struct page *pages[64]; /* XXX is this too much to have on stack? */
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unsigned long pfn;
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pgoff_t pgoff, base_pgoff;
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unsigned long vaddr;
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int i, err, slots;
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vm_fault_t ret = VM_FAULT_NOPAGE;
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/*
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* Note the height of the slot is also equal to the number of pages
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* that need to be mapped in to fill 4kb wide CPU page. If the slot
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* height is 64, then 64 pages fill a 4kb wide by 64 row region.
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*/
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const int n = priv->usergart[fmt].height;
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const int n_shift = priv->usergart[fmt].height_shift;
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/*
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* If buffer width in bytes > PAGE_SIZE then the virtual stride is
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* rounded up to next multiple of PAGE_SIZE.. this need to be taken
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* into account in some of the math, so figure out virtual stride
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* in pages
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*/
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const int m = DIV_ROUND_UP(omap_obj->width << fmt, PAGE_SIZE);
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/* We don't use vmf->pgoff since that has the fake offset: */
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pgoff = (vmf->address - vma->vm_start) >> PAGE_SHIFT;
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/*
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* Actual address we start mapping at is rounded down to previous slot
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* boundary in the y direction:
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*/
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base_pgoff = round_down(pgoff, m << n_shift);
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/* figure out buffer width in slots */
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slots = omap_obj->width >> priv->usergart[fmt].slot_shift;
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vaddr = vmf->address - ((pgoff - base_pgoff) << PAGE_SHIFT);
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entry = &priv->usergart[fmt].entry[priv->usergart[fmt].last];
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/* evict previous buffer using this usergart entry, if any: */
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if (entry->obj)
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omap_gem_evict_entry(entry->obj, fmt, entry);
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entry->obj = obj;
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entry->obj_pgoff = base_pgoff;
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/* now convert base_pgoff to phys offset from virt offset: */
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base_pgoff = (base_pgoff >> n_shift) * slots;
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/* for wider-than 4k.. figure out which part of the slot-row we want: */
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if (m > 1) {
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int off = pgoff % m;
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entry->obj_pgoff += off;
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base_pgoff /= m;
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slots = min(slots - (off << n_shift), n);
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base_pgoff += off << n_shift;
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vaddr += off << PAGE_SHIFT;
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}
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/*
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* Map in pages. Beyond the valid pixel part of the buffer, we set
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* pages[i] to NULL to get a dummy page mapped in.. if someone
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* reads/writes it they will get random/undefined content, but at
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* least it won't be corrupting whatever other random page used to
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* be mapped in, or other undefined behavior.
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*/
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memcpy(pages, &omap_obj->pages[base_pgoff],
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sizeof(struct page *) * slots);
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memset(pages + slots, 0,
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sizeof(struct page *) * (n - slots));
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err = tiler_pin(entry->block, pages, ARRAY_SIZE(pages), 0, true);
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if (err) {
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ret = vmf_error(err);
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dev_err(obj->dev->dev, "failed to pin: %d\n", err);
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return ret;
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}
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pfn = entry->dma_addr >> PAGE_SHIFT;
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VERB("Inserting %p pfn %lx, pa %lx", (void *)vmf->address,
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pfn, pfn << PAGE_SHIFT);
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for (i = n; i > 0; i--) {
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ret = vmf_insert_mixed(vma,
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vaddr, __pfn_to_pfn_t(pfn, PFN_DEV));
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if (ret & VM_FAULT_ERROR)
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break;
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pfn += priv->usergart[fmt].stride_pfn;
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vaddr += PAGE_SIZE * m;
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}
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/* simple round-robin: */
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priv->usergart[fmt].last = (priv->usergart[fmt].last + 1)
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% NUM_USERGART_ENTRIES;
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return ret;
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}
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/**
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* omap_gem_fault - pagefault handler for GEM objects
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* @vmf: fault detail
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*
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* Invoked when a fault occurs on an mmap of a GEM managed area. GEM
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* does most of the work for us including the actual map/unmap calls
|
|
* but we need to do the actual page work.
|
|
*
|
|
* The VMA was set up by GEM. In doing so it also ensured that the
|
|
* vma->vm_private_data points to the GEM object that is backing this
|
|
* mapping.
|
|
*/
|
|
static vm_fault_t omap_gem_fault(struct vm_fault *vmf)
|
|
{
|
|
struct vm_area_struct *vma = vmf->vma;
|
|
struct drm_gem_object *obj = vma->vm_private_data;
|
|
struct omap_gem_object *omap_obj = to_omap_bo(obj);
|
|
int err;
|
|
vm_fault_t ret;
|
|
|
|
/* Make sure we don't parallel update on a fault, nor move or remove
|
|
* something from beneath our feet
|
|
*/
|
|
mutex_lock(&omap_obj->lock);
|
|
|
|
/* if a shmem backed object, make sure we have pages attached now */
|
|
err = omap_gem_attach_pages(obj);
|
|
if (err) {
|
|
ret = vmf_error(err);
|
|
goto fail;
|
|
}
|
|
|
|
/* where should we do corresponding put_pages().. we are mapping
|
|
* the original page, rather than thru a GART, so we can't rely
|
|
* on eviction to trigger this. But munmap() or all mappings should
|
|
* probably trigger put_pages()?
|
|
*/
|
|
|
|
if (omap_obj->flags & OMAP_BO_TILED_MASK)
|
|
ret = omap_gem_fault_2d(obj, vma, vmf);
|
|
else
|
|
ret = omap_gem_fault_1d(obj, vma, vmf);
|
|
|
|
|
|
fail:
|
|
mutex_unlock(&omap_obj->lock);
|
|
return ret;
|
|
}
|
|
|
|
/** We override mainly to fix up some of the vm mapping flags.. */
|
|
int omap_gem_mmap(struct file *filp, struct vm_area_struct *vma)
|
|
{
|
|
int ret;
|
|
|
|
ret = drm_gem_mmap(filp, vma);
|
|
if (ret) {
|
|
DBG("mmap failed: %d", ret);
|
|
return ret;
|
|
}
|
|
|
|
return omap_gem_mmap_obj(vma->vm_private_data, vma);
|
|
}
|
|
|
|
int omap_gem_mmap_obj(struct drm_gem_object *obj,
|
|
struct vm_area_struct *vma)
|
|
{
|
|
struct omap_gem_object *omap_obj = to_omap_bo(obj);
|
|
|
|
vma->vm_flags &= ~VM_PFNMAP;
|
|
vma->vm_flags |= VM_MIXEDMAP;
|
|
|
|
if (omap_obj->flags & OMAP_BO_WC) {
|
|
vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
|
|
} else if (omap_obj->flags & OMAP_BO_UNCACHED) {
|
|
vma->vm_page_prot = pgprot_noncached(vm_get_page_prot(vma->vm_flags));
|
|
} else {
|
|
/*
|
|
* We do have some private objects, at least for scanout buffers
|
|
* on hardware without DMM/TILER. But these are allocated write-
|
|
* combine
|
|
*/
|
|
if (WARN_ON(!obj->filp))
|
|
return -EINVAL;
|
|
|
|
/*
|
|
* Shunt off cached objs to shmem file so they have their own
|
|
* address_space (so unmap_mapping_range does what we want,
|
|
* in particular in the case of mmap'd dmabufs)
|
|
*/
|
|
vma->vm_pgoff = 0;
|
|
vma_set_file(vma, obj->filp);
|
|
|
|
vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* -----------------------------------------------------------------------------
|
|
* Dumb Buffers
|
|
*/
|
|
|
|
/**
|
|
* omap_gem_dumb_create - create a dumb buffer
|
|
* @file: our client file
|
|
* @dev: our device
|
|
* @args: the requested arguments copied from userspace
|
|
*
|
|
* Allocate a buffer suitable for use for a frame buffer of the
|
|
* form described by user space. Give userspace a handle by which
|
|
* to reference it.
|
|
*/
|
|
int omap_gem_dumb_create(struct drm_file *file, struct drm_device *dev,
|
|
struct drm_mode_create_dumb *args)
|
|
{
|
|
union omap_gem_size gsize;
|
|
|
|
args->pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
|
|
|
|
args->size = PAGE_ALIGN(args->pitch * args->height);
|
|
|
|
gsize = (union omap_gem_size){
|
|
.bytes = args->size,
|
|
};
|
|
|
|
return omap_gem_new_handle(dev, file, gsize,
|
|
OMAP_BO_SCANOUT | OMAP_BO_WC, &args->handle);
|
|
}
|
|
|
|
/**
|
|
* omap_gem_dumb_map - buffer mapping for dumb interface
|
|
* @file: our drm client file
|
|
* @dev: drm device
|
|
* @handle: GEM handle to the object (from dumb_create)
|
|
* @offset: memory map offset placeholder
|
|
*
|
|
* Do the necessary setup to allow the mapping of the frame buffer
|
|
* into user memory. We don't have to do much here at the moment.
|
|
*/
|
|
int omap_gem_dumb_map_offset(struct drm_file *file, struct drm_device *dev,
|
|
u32 handle, u64 *offset)
|
|
{
|
|
struct drm_gem_object *obj;
|
|
int ret = 0;
|
|
|
|
/* GEM does all our handle to object mapping */
|
|
obj = drm_gem_object_lookup(file, handle);
|
|
if (obj == NULL) {
|
|
ret = -ENOENT;
|
|
goto fail;
|
|
}
|
|
|
|
*offset = omap_gem_mmap_offset(obj);
|
|
|
|
drm_gem_object_put(obj);
|
|
|
|
fail:
|
|
return ret;
|
|
}
|
|
|
|
#ifdef CONFIG_DRM_FBDEV_EMULATION
|
|
/* Set scrolling position. This allows us to implement fast scrolling
|
|
* for console.
|
|
*
|
|
* Call only from non-atomic contexts.
|
|
*/
|
|
int omap_gem_roll(struct drm_gem_object *obj, u32 roll)
|
|
{
|
|
struct omap_gem_object *omap_obj = to_omap_bo(obj);
|
|
u32 npages = obj->size >> PAGE_SHIFT;
|
|
int ret = 0;
|
|
|
|
if (roll > npages) {
|
|
dev_err(obj->dev->dev, "invalid roll: %d\n", roll);
|
|
return -EINVAL;
|
|
}
|
|
|
|
omap_obj->roll = roll;
|
|
|
|
mutex_lock(&omap_obj->lock);
|
|
|
|
/* if we aren't mapped yet, we don't need to do anything */
|
|
if (omap_obj->block) {
|
|
ret = omap_gem_attach_pages(obj);
|
|
if (ret)
|
|
goto fail;
|
|
|
|
ret = tiler_pin(omap_obj->block, omap_obj->pages, npages,
|
|
roll, true);
|
|
if (ret)
|
|
dev_err(obj->dev->dev, "could not repin: %d\n", ret);
|
|
}
|
|
|
|
fail:
|
|
mutex_unlock(&omap_obj->lock);
|
|
|
|
return ret;
|
|
}
|
|
#endif
|
|
|
|
/* -----------------------------------------------------------------------------
|
|
* Memory Management & DMA Sync
|
|
*/
|
|
|
|
/*
|
|
* shmem buffers that are mapped cached are not coherent.
|
|
*
|
|
* We keep track of dirty pages using page faulting to perform cache management.
|
|
* When a page is mapped to the CPU in read/write mode the device can't access
|
|
* it and omap_obj->dma_addrs[i] is NULL. When a page is mapped to the device
|
|
* the omap_obj->dma_addrs[i] is set to the DMA address, and the page is
|
|
* unmapped from the CPU.
|
|
*/
|
|
static inline bool omap_gem_is_cached_coherent(struct drm_gem_object *obj)
|
|
{
|
|
struct omap_gem_object *omap_obj = to_omap_bo(obj);
|
|
|
|
return !((omap_obj->flags & OMAP_BO_MEM_SHMEM) &&
|
|
((omap_obj->flags & OMAP_BO_CACHE_MASK) == OMAP_BO_CACHED));
|
|
}
|
|
|
|
/* Sync the buffer for CPU access.. note pages should already be
|
|
* attached, ie. omap_gem_get_pages()
|
|
*/
|
|
void omap_gem_cpu_sync_page(struct drm_gem_object *obj, int pgoff)
|
|
{
|
|
struct drm_device *dev = obj->dev;
|
|
struct omap_gem_object *omap_obj = to_omap_bo(obj);
|
|
|
|
if (omap_gem_is_cached_coherent(obj))
|
|
return;
|
|
|
|
if (omap_obj->dma_addrs[pgoff]) {
|
|
dma_unmap_page(dev->dev, omap_obj->dma_addrs[pgoff],
|
|
PAGE_SIZE, DMA_TO_DEVICE);
|
|
omap_obj->dma_addrs[pgoff] = 0;
|
|
}
|
|
}
|
|
|
|
/* sync the buffer for DMA access */
|
|
void omap_gem_dma_sync_buffer(struct drm_gem_object *obj,
|
|
enum dma_data_direction dir)
|
|
{
|
|
struct drm_device *dev = obj->dev;
|
|
struct omap_gem_object *omap_obj = to_omap_bo(obj);
|
|
int i, npages = obj->size >> PAGE_SHIFT;
|
|
struct page **pages = omap_obj->pages;
|
|
bool dirty = false;
|
|
|
|
if (omap_gem_is_cached_coherent(obj))
|
|
return;
|
|
|
|
for (i = 0; i < npages; i++) {
|
|
if (!omap_obj->dma_addrs[i]) {
|
|
dma_addr_t addr;
|
|
|
|
addr = dma_map_page(dev->dev, pages[i], 0,
|
|
PAGE_SIZE, dir);
|
|
if (dma_mapping_error(dev->dev, addr)) {
|
|
dev_warn(dev->dev, "%s: failed to map page\n",
|
|
__func__);
|
|
break;
|
|
}
|
|
|
|
dirty = true;
|
|
omap_obj->dma_addrs[i] = addr;
|
|
}
|
|
}
|
|
|
|
if (dirty) {
|
|
unmap_mapping_range(obj->filp->f_mapping, 0,
|
|
omap_gem_mmap_size(obj), 1);
|
|
}
|
|
}
|
|
|
|
/**
|
|
* omap_gem_pin() - Pin a GEM object in memory
|
|
* @obj: the GEM object
|
|
* @dma_addr: the DMA address
|
|
*
|
|
* Pin the given GEM object in memory and fill the dma_addr pointer with the
|
|
* object's DMA address. If the buffer is not physically contiguous it will be
|
|
* remapped through the TILER to provide a contiguous view.
|
|
*
|
|
* Pins are reference-counted, calling this function multiple times is allowed
|
|
* as long the corresponding omap_gem_unpin() calls are balanced.
|
|
*
|
|
* Return 0 on success or a negative error code otherwise.
|
|
*/
|
|
int omap_gem_pin(struct drm_gem_object *obj, dma_addr_t *dma_addr)
|
|
{
|
|
struct omap_drm_private *priv = obj->dev->dev_private;
|
|
struct omap_gem_object *omap_obj = to_omap_bo(obj);
|
|
int ret = 0;
|
|
|
|
mutex_lock(&omap_obj->lock);
|
|
|
|
if (!omap_gem_is_contiguous(omap_obj) && priv->has_dmm) {
|
|
if (refcount_read(&omap_obj->dma_addr_cnt) == 0) {
|
|
u32 npages = obj->size >> PAGE_SHIFT;
|
|
enum tiler_fmt fmt = gem2fmt(omap_obj->flags);
|
|
struct tiler_block *block;
|
|
|
|
BUG_ON(omap_obj->block);
|
|
|
|
refcount_set(&omap_obj->dma_addr_cnt, 1);
|
|
|
|
ret = omap_gem_attach_pages(obj);
|
|
if (ret)
|
|
goto fail;
|
|
|
|
if (omap_obj->flags & OMAP_BO_TILED_MASK) {
|
|
block = tiler_reserve_2d(fmt,
|
|
omap_obj->width,
|
|
omap_obj->height, 0);
|
|
} else {
|
|
block = tiler_reserve_1d(obj->size);
|
|
}
|
|
|
|
if (IS_ERR(block)) {
|
|
ret = PTR_ERR(block);
|
|
dev_err(obj->dev->dev,
|
|
"could not remap: %d (%d)\n", ret, fmt);
|
|
goto fail;
|
|
}
|
|
|
|
/* TODO: enable async refill.. */
|
|
ret = tiler_pin(block, omap_obj->pages, npages,
|
|
omap_obj->roll, true);
|
|
if (ret) {
|
|
tiler_release(block);
|
|
dev_err(obj->dev->dev,
|
|
"could not pin: %d\n", ret);
|
|
goto fail;
|
|
}
|
|
|
|
omap_obj->dma_addr = tiler_ssptr(block);
|
|
omap_obj->block = block;
|
|
|
|
DBG("got dma address: %pad", &omap_obj->dma_addr);
|
|
} else {
|
|
refcount_inc(&omap_obj->dma_addr_cnt);
|
|
}
|
|
|
|
if (dma_addr)
|
|
*dma_addr = omap_obj->dma_addr;
|
|
} else if (omap_gem_is_contiguous(omap_obj)) {
|
|
if (dma_addr)
|
|
*dma_addr = omap_obj->dma_addr;
|
|
} else {
|
|
ret = -EINVAL;
|
|
goto fail;
|
|
}
|
|
|
|
fail:
|
|
mutex_unlock(&omap_obj->lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* omap_gem_unpin_locked() - Unpin a GEM object from memory
|
|
* @obj: the GEM object
|
|
*
|
|
* omap_gem_unpin() without locking.
|
|
*/
|
|
static void omap_gem_unpin_locked(struct drm_gem_object *obj)
|
|
{
|
|
struct omap_drm_private *priv = obj->dev->dev_private;
|
|
struct omap_gem_object *omap_obj = to_omap_bo(obj);
|
|
int ret;
|
|
|
|
if (omap_gem_is_contiguous(omap_obj) || !priv->has_dmm)
|
|
return;
|
|
|
|
if (refcount_dec_and_test(&omap_obj->dma_addr_cnt)) {
|
|
ret = tiler_unpin(omap_obj->block);
|
|
if (ret) {
|
|
dev_err(obj->dev->dev,
|
|
"could not unpin pages: %d\n", ret);
|
|
}
|
|
ret = tiler_release(omap_obj->block);
|
|
if (ret) {
|
|
dev_err(obj->dev->dev,
|
|
"could not release unmap: %d\n", ret);
|
|
}
|
|
omap_obj->dma_addr = 0;
|
|
omap_obj->block = NULL;
|
|
}
|
|
}
|
|
|
|
/**
|
|
* omap_gem_unpin() - Unpin a GEM object from memory
|
|
* @obj: the GEM object
|
|
*
|
|
* Unpin the given GEM object previously pinned with omap_gem_pin(). Pins are
|
|
* reference-counted, the actual unpin will only be performed when the number
|
|
* of calls to this function matches the number of calls to omap_gem_pin().
|
|
*/
|
|
void omap_gem_unpin(struct drm_gem_object *obj)
|
|
{
|
|
struct omap_gem_object *omap_obj = to_omap_bo(obj);
|
|
|
|
mutex_lock(&omap_obj->lock);
|
|
omap_gem_unpin_locked(obj);
|
|
mutex_unlock(&omap_obj->lock);
|
|
}
|
|
|
|
/* Get rotated scanout address (only valid if already pinned), at the
|
|
* specified orientation and x,y offset from top-left corner of buffer
|
|
* (only valid for tiled 2d buffers)
|
|
*/
|
|
int omap_gem_rotated_dma_addr(struct drm_gem_object *obj, u32 orient,
|
|
int x, int y, dma_addr_t *dma_addr)
|
|
{
|
|
struct omap_gem_object *omap_obj = to_omap_bo(obj);
|
|
int ret = -EINVAL;
|
|
|
|
mutex_lock(&omap_obj->lock);
|
|
|
|
if ((refcount_read(&omap_obj->dma_addr_cnt) > 0) && omap_obj->block &&
|
|
(omap_obj->flags & OMAP_BO_TILED_MASK)) {
|
|
*dma_addr = tiler_tsptr(omap_obj->block, orient, x, y);
|
|
ret = 0;
|
|
}
|
|
|
|
mutex_unlock(&omap_obj->lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* Get tiler stride for the buffer (only valid for 2d tiled buffers) */
|
|
int omap_gem_tiled_stride(struct drm_gem_object *obj, u32 orient)
|
|
{
|
|
struct omap_gem_object *omap_obj = to_omap_bo(obj);
|
|
int ret = -EINVAL;
|
|
if (omap_obj->flags & OMAP_BO_TILED_MASK)
|
|
ret = tiler_stride(gem2fmt(omap_obj->flags), orient);
|
|
return ret;
|
|
}
|
|
|
|
/* if !remap, and we don't have pages backing, then fail, rather than
|
|
* increasing the pin count (which we don't really do yet anyways,
|
|
* because we don't support swapping pages back out). And 'remap'
|
|
* might not be quite the right name, but I wanted to keep it working
|
|
* similarly to omap_gem_pin(). Note though that mutex is not
|
|
* aquired if !remap (because this can be called in atomic ctxt),
|
|
* but probably omap_gem_unpin() should be changed to work in the
|
|
* same way. If !remap, a matching omap_gem_put_pages() call is not
|
|
* required (and should not be made).
|
|
*/
|
|
int omap_gem_get_pages(struct drm_gem_object *obj, struct page ***pages,
|
|
bool remap)
|
|
{
|
|
struct omap_gem_object *omap_obj = to_omap_bo(obj);
|
|
int ret = 0;
|
|
|
|
mutex_lock(&omap_obj->lock);
|
|
|
|
if (remap) {
|
|
ret = omap_gem_attach_pages(obj);
|
|
if (ret)
|
|
goto unlock;
|
|
}
|
|
|
|
if (!omap_obj->pages) {
|
|
ret = -ENOMEM;
|
|
goto unlock;
|
|
}
|
|
|
|
*pages = omap_obj->pages;
|
|
|
|
unlock:
|
|
mutex_unlock(&omap_obj->lock);
|
|
|
|
return ret;
|
|
}
|
|
|
|
/* release pages when DMA no longer being performed */
|
|
int omap_gem_put_pages(struct drm_gem_object *obj)
|
|
{
|
|
/* do something here if we dynamically attach/detach pages.. at
|
|
* least they would no longer need to be pinned if everyone has
|
|
* released the pages..
|
|
*/
|
|
return 0;
|
|
}
|
|
|
|
#ifdef CONFIG_DRM_FBDEV_EMULATION
|
|
/*
|
|
* Get kernel virtual address for CPU access.. this more or less only
|
|
* exists for omap_fbdev.
|
|
*/
|
|
void *omap_gem_vaddr(struct drm_gem_object *obj)
|
|
{
|
|
struct omap_gem_object *omap_obj = to_omap_bo(obj);
|
|
void *vaddr;
|
|
int ret;
|
|
|
|
mutex_lock(&omap_obj->lock);
|
|
|
|
if (!omap_obj->vaddr) {
|
|
ret = omap_gem_attach_pages(obj);
|
|
if (ret) {
|
|
vaddr = ERR_PTR(ret);
|
|
goto unlock;
|
|
}
|
|
|
|
omap_obj->vaddr = vmap(omap_obj->pages, obj->size >> PAGE_SHIFT,
|
|
VM_MAP, pgprot_writecombine(PAGE_KERNEL));
|
|
}
|
|
|
|
vaddr = omap_obj->vaddr;
|
|
|
|
unlock:
|
|
mutex_unlock(&omap_obj->lock);
|
|
return vaddr;
|
|
}
|
|
#endif
|
|
|
|
/* -----------------------------------------------------------------------------
|
|
* Power Management
|
|
*/
|
|
|
|
#ifdef CONFIG_PM
|
|
/* re-pin objects in DMM in resume path: */
|
|
int omap_gem_resume(struct drm_device *dev)
|
|
{
|
|
struct omap_drm_private *priv = dev->dev_private;
|
|
struct omap_gem_object *omap_obj;
|
|
int ret = 0;
|
|
|
|
mutex_lock(&priv->list_lock);
|
|
list_for_each_entry(omap_obj, &priv->obj_list, mm_list) {
|
|
if (omap_obj->block) {
|
|
struct drm_gem_object *obj = &omap_obj->base;
|
|
u32 npages = obj->size >> PAGE_SHIFT;
|
|
|
|
WARN_ON(!omap_obj->pages); /* this can't happen */
|
|
ret = tiler_pin(omap_obj->block,
|
|
omap_obj->pages, npages,
|
|
omap_obj->roll, true);
|
|
if (ret) {
|
|
dev_err(dev->dev, "could not repin: %d\n", ret);
|
|
goto done;
|
|
}
|
|
}
|
|
}
|
|
|
|
done:
|
|
mutex_unlock(&priv->list_lock);
|
|
return ret;
|
|
}
|
|
#endif
|
|
|
|
/* -----------------------------------------------------------------------------
|
|
* DebugFS
|
|
*/
|
|
|
|
#ifdef CONFIG_DEBUG_FS
|
|
void omap_gem_describe(struct drm_gem_object *obj, struct seq_file *m)
|
|
{
|
|
struct omap_gem_object *omap_obj = to_omap_bo(obj);
|
|
u64 off;
|
|
|
|
off = drm_vma_node_start(&obj->vma_node);
|
|
|
|
mutex_lock(&omap_obj->lock);
|
|
|
|
seq_printf(m, "%08x: %2d (%2d) %08llx %pad (%2d) %p %4d",
|
|
omap_obj->flags, obj->name, kref_read(&obj->refcount),
|
|
off, &omap_obj->dma_addr,
|
|
refcount_read(&omap_obj->dma_addr_cnt),
|
|
omap_obj->vaddr, omap_obj->roll);
|
|
|
|
if (omap_obj->flags & OMAP_BO_TILED_MASK) {
|
|
seq_printf(m, " %dx%d", omap_obj->width, omap_obj->height);
|
|
if (omap_obj->block) {
|
|
struct tcm_area *area = &omap_obj->block->area;
|
|
seq_printf(m, " (%dx%d, %dx%d)",
|
|
area->p0.x, area->p0.y,
|
|
area->p1.x, area->p1.y);
|
|
}
|
|
} else {
|
|
seq_printf(m, " %zu", obj->size);
|
|
}
|
|
|
|
mutex_unlock(&omap_obj->lock);
|
|
|
|
seq_printf(m, "\n");
|
|
}
|
|
|
|
void omap_gem_describe_objects(struct list_head *list, struct seq_file *m)
|
|
{
|
|
struct omap_gem_object *omap_obj;
|
|
int count = 0;
|
|
size_t size = 0;
|
|
|
|
list_for_each_entry(omap_obj, list, mm_list) {
|
|
struct drm_gem_object *obj = &omap_obj->base;
|
|
seq_printf(m, " ");
|
|
omap_gem_describe(obj, m);
|
|
count++;
|
|
size += obj->size;
|
|
}
|
|
|
|
seq_printf(m, "Total %d objects, %zu bytes\n", count, size);
|
|
}
|
|
#endif
|
|
|
|
/* -----------------------------------------------------------------------------
|
|
* Constructor & Destructor
|
|
*/
|
|
|
|
static void omap_gem_free_object(struct drm_gem_object *obj)
|
|
{
|
|
struct drm_device *dev = obj->dev;
|
|
struct omap_drm_private *priv = dev->dev_private;
|
|
struct omap_gem_object *omap_obj = to_omap_bo(obj);
|
|
|
|
omap_gem_evict(obj);
|
|
|
|
mutex_lock(&priv->list_lock);
|
|
list_del(&omap_obj->mm_list);
|
|
mutex_unlock(&priv->list_lock);
|
|
|
|
/*
|
|
* We own the sole reference to the object at this point, but to keep
|
|
* lockdep happy, we must still take the omap_obj_lock to call
|
|
* omap_gem_detach_pages(). This should hardly make any difference as
|
|
* there can't be any lock contention.
|
|
*/
|
|
mutex_lock(&omap_obj->lock);
|
|
|
|
/* The object should not be pinned. */
|
|
WARN_ON(refcount_read(&omap_obj->dma_addr_cnt) > 0);
|
|
|
|
if (omap_obj->pages) {
|
|
if (omap_obj->flags & OMAP_BO_MEM_DMABUF)
|
|
kfree(omap_obj->pages);
|
|
else
|
|
omap_gem_detach_pages(obj);
|
|
}
|
|
|
|
if (omap_obj->flags & OMAP_BO_MEM_DMA_API) {
|
|
dma_free_wc(dev->dev, obj->size, omap_obj->vaddr,
|
|
omap_obj->dma_addr);
|
|
} else if (omap_obj->vaddr) {
|
|
vunmap(omap_obj->vaddr);
|
|
} else if (obj->import_attach) {
|
|
drm_prime_gem_destroy(obj, omap_obj->sgt);
|
|
}
|
|
|
|
mutex_unlock(&omap_obj->lock);
|
|
|
|
drm_gem_object_release(obj);
|
|
|
|
mutex_destroy(&omap_obj->lock);
|
|
|
|
kfree(omap_obj);
|
|
}
|
|
|
|
static bool omap_gem_validate_flags(struct drm_device *dev, u32 flags)
|
|
{
|
|
struct omap_drm_private *priv = dev->dev_private;
|
|
|
|
switch (flags & OMAP_BO_CACHE_MASK) {
|
|
case OMAP_BO_CACHED:
|
|
case OMAP_BO_WC:
|
|
case OMAP_BO_CACHE_MASK:
|
|
break;
|
|
|
|
default:
|
|
return false;
|
|
}
|
|
|
|
if (flags & OMAP_BO_TILED_MASK) {
|
|
if (!priv->usergart)
|
|
return false;
|
|
|
|
switch (flags & OMAP_BO_TILED_MASK) {
|
|
case OMAP_BO_TILED_8:
|
|
case OMAP_BO_TILED_16:
|
|
case OMAP_BO_TILED_32:
|
|
break;
|
|
|
|
default:
|
|
return false;
|
|
}
|
|
}
|
|
|
|
return true;
|
|
}
|
|
|
|
static const struct vm_operations_struct omap_gem_vm_ops = {
|
|
.fault = omap_gem_fault,
|
|
.open = drm_gem_vm_open,
|
|
.close = drm_gem_vm_close,
|
|
};
|
|
|
|
static const struct drm_gem_object_funcs omap_gem_object_funcs = {
|
|
.free = omap_gem_free_object,
|
|
.export = omap_gem_prime_export,
|
|
.vm_ops = &omap_gem_vm_ops,
|
|
};
|
|
|
|
/* GEM buffer object constructor */
|
|
struct drm_gem_object *omap_gem_new(struct drm_device *dev,
|
|
union omap_gem_size gsize, u32 flags)
|
|
{
|
|
struct omap_drm_private *priv = dev->dev_private;
|
|
struct omap_gem_object *omap_obj;
|
|
struct drm_gem_object *obj;
|
|
struct address_space *mapping;
|
|
size_t size;
|
|
int ret;
|
|
|
|
if (!omap_gem_validate_flags(dev, flags))
|
|
return NULL;
|
|
|
|
/* Validate the flags and compute the memory and cache flags. */
|
|
if (flags & OMAP_BO_TILED_MASK) {
|
|
/*
|
|
* Tiled buffers are always shmem paged backed. When they are
|
|
* scanned out, they are remapped into DMM/TILER.
|
|
*/
|
|
flags |= OMAP_BO_MEM_SHMEM;
|
|
|
|
/*
|
|
* Currently don't allow cached buffers. There is some caching
|
|
* stuff that needs to be handled better.
|
|
*/
|
|
flags &= ~(OMAP_BO_CACHED|OMAP_BO_WC|OMAP_BO_UNCACHED);
|
|
flags |= tiler_get_cpu_cache_flags();
|
|
} else if ((flags & OMAP_BO_SCANOUT) && !priv->has_dmm) {
|
|
/*
|
|
* If we don't have DMM, we must allocate scanout buffers
|
|
* from contiguous DMA memory.
|
|
*/
|
|
flags |= OMAP_BO_MEM_DMA_API;
|
|
} else if (!(flags & OMAP_BO_MEM_DMABUF)) {
|
|
/*
|
|
* All other buffers not backed by dma_buf are shmem-backed.
|
|
*/
|
|
flags |= OMAP_BO_MEM_SHMEM;
|
|
}
|
|
|
|
/* Allocate the initialize the OMAP GEM object. */
|
|
omap_obj = kzalloc(sizeof(*omap_obj), GFP_KERNEL);
|
|
if (!omap_obj)
|
|
return NULL;
|
|
|
|
obj = &omap_obj->base;
|
|
omap_obj->flags = flags;
|
|
mutex_init(&omap_obj->lock);
|
|
|
|
if (flags & OMAP_BO_TILED_MASK) {
|
|
/*
|
|
* For tiled buffers align dimensions to slot boundaries and
|
|
* calculate size based on aligned dimensions.
|
|
*/
|
|
tiler_align(gem2fmt(flags), &gsize.tiled.width,
|
|
&gsize.tiled.height);
|
|
|
|
size = tiler_size(gem2fmt(flags), gsize.tiled.width,
|
|
gsize.tiled.height);
|
|
|
|
omap_obj->width = gsize.tiled.width;
|
|
omap_obj->height = gsize.tiled.height;
|
|
} else {
|
|
size = PAGE_ALIGN(gsize.bytes);
|
|
}
|
|
|
|
obj->funcs = &omap_gem_object_funcs;
|
|
|
|
/* Initialize the GEM object. */
|
|
if (!(flags & OMAP_BO_MEM_SHMEM)) {
|
|
drm_gem_private_object_init(dev, obj, size);
|
|
} else {
|
|
ret = drm_gem_object_init(dev, obj, size);
|
|
if (ret)
|
|
goto err_free;
|
|
|
|
mapping = obj->filp->f_mapping;
|
|
mapping_set_gfp_mask(mapping, GFP_USER | __GFP_DMA32);
|
|
}
|
|
|
|
/* Allocate memory if needed. */
|
|
if (flags & OMAP_BO_MEM_DMA_API) {
|
|
omap_obj->vaddr = dma_alloc_wc(dev->dev, size,
|
|
&omap_obj->dma_addr,
|
|
GFP_KERNEL);
|
|
if (!omap_obj->vaddr)
|
|
goto err_release;
|
|
}
|
|
|
|
mutex_lock(&priv->list_lock);
|
|
list_add(&omap_obj->mm_list, &priv->obj_list);
|
|
mutex_unlock(&priv->list_lock);
|
|
|
|
return obj;
|
|
|
|
err_release:
|
|
drm_gem_object_release(obj);
|
|
err_free:
|
|
kfree(omap_obj);
|
|
return NULL;
|
|
}
|
|
|
|
struct drm_gem_object *omap_gem_new_dmabuf(struct drm_device *dev, size_t size,
|
|
struct sg_table *sgt)
|
|
{
|
|
struct omap_drm_private *priv = dev->dev_private;
|
|
struct omap_gem_object *omap_obj;
|
|
struct drm_gem_object *obj;
|
|
union omap_gem_size gsize;
|
|
|
|
/* Without a DMM only physically contiguous buffers can be supported. */
|
|
if (sgt->orig_nents != 1 && !priv->has_dmm)
|
|
return ERR_PTR(-EINVAL);
|
|
|
|
gsize.bytes = PAGE_ALIGN(size);
|
|
obj = omap_gem_new(dev, gsize, OMAP_BO_MEM_DMABUF | OMAP_BO_WC);
|
|
if (!obj)
|
|
return ERR_PTR(-ENOMEM);
|
|
|
|
omap_obj = to_omap_bo(obj);
|
|
|
|
mutex_lock(&omap_obj->lock);
|
|
|
|
omap_obj->sgt = sgt;
|
|
|
|
if (sgt->orig_nents == 1) {
|
|
omap_obj->dma_addr = sg_dma_address(sgt->sgl);
|
|
} else {
|
|
/* Create pages list from sgt */
|
|
struct page **pages;
|
|
unsigned int npages;
|
|
unsigned int ret;
|
|
|
|
npages = DIV_ROUND_UP(size, PAGE_SIZE);
|
|
pages = kcalloc(npages, sizeof(*pages), GFP_KERNEL);
|
|
if (!pages) {
|
|
omap_gem_free_object(obj);
|
|
obj = ERR_PTR(-ENOMEM);
|
|
goto done;
|
|
}
|
|
|
|
omap_obj->pages = pages;
|
|
ret = drm_prime_sg_to_page_array(sgt, pages, npages);
|
|
if (ret) {
|
|
omap_gem_free_object(obj);
|
|
obj = ERR_PTR(-ENOMEM);
|
|
goto done;
|
|
}
|
|
}
|
|
|
|
done:
|
|
mutex_unlock(&omap_obj->lock);
|
|
return obj;
|
|
}
|
|
|
|
/* convenience method to construct a GEM buffer object, and userspace handle */
|
|
int omap_gem_new_handle(struct drm_device *dev, struct drm_file *file,
|
|
union omap_gem_size gsize, u32 flags, u32 *handle)
|
|
{
|
|
struct drm_gem_object *obj;
|
|
int ret;
|
|
|
|
obj = omap_gem_new(dev, gsize, flags);
|
|
if (!obj)
|
|
return -ENOMEM;
|
|
|
|
ret = drm_gem_handle_create(file, obj, handle);
|
|
if (ret) {
|
|
omap_gem_free_object(obj);
|
|
return ret;
|
|
}
|
|
|
|
/* drop reference from allocate - handle holds it now */
|
|
drm_gem_object_put(obj);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* -----------------------------------------------------------------------------
|
|
* Init & Cleanup
|
|
*/
|
|
|
|
/* If DMM is used, we need to set some stuff up.. */
|
|
void omap_gem_init(struct drm_device *dev)
|
|
{
|
|
struct omap_drm_private *priv = dev->dev_private;
|
|
struct omap_drm_usergart *usergart;
|
|
const enum tiler_fmt fmts[] = {
|
|
TILFMT_8BIT, TILFMT_16BIT, TILFMT_32BIT
|
|
};
|
|
int i, j;
|
|
|
|
if (!dmm_is_available()) {
|
|
/* DMM only supported on OMAP4 and later, so this isn't fatal */
|
|
dev_warn(dev->dev, "DMM not available, disable DMM support\n");
|
|
return;
|
|
}
|
|
|
|
usergart = kcalloc(3, sizeof(*usergart), GFP_KERNEL);
|
|
if (!usergart)
|
|
return;
|
|
|
|
/* reserve 4k aligned/wide regions for userspace mappings: */
|
|
for (i = 0; i < ARRAY_SIZE(fmts); i++) {
|
|
u16 h = 1, w = PAGE_SIZE >> i;
|
|
|
|
tiler_align(fmts[i], &w, &h);
|
|
/* note: since each region is 1 4kb page wide, and minimum
|
|
* number of rows, the height ends up being the same as the
|
|
* # of pages in the region
|
|
*/
|
|
usergart[i].height = h;
|
|
usergart[i].height_shift = ilog2(h);
|
|
usergart[i].stride_pfn = tiler_stride(fmts[i], 0) >> PAGE_SHIFT;
|
|
usergart[i].slot_shift = ilog2((PAGE_SIZE / h) >> i);
|
|
for (j = 0; j < NUM_USERGART_ENTRIES; j++) {
|
|
struct omap_drm_usergart_entry *entry;
|
|
struct tiler_block *block;
|
|
|
|
entry = &usergart[i].entry[j];
|
|
block = tiler_reserve_2d(fmts[i], w, h, PAGE_SIZE);
|
|
if (IS_ERR(block)) {
|
|
dev_err(dev->dev,
|
|
"reserve failed: %d, %d, %ld\n",
|
|
i, j, PTR_ERR(block));
|
|
return;
|
|
}
|
|
entry->dma_addr = tiler_ssptr(block);
|
|
entry->block = block;
|
|
|
|
DBG("%d:%d: %dx%d: dma_addr=%pad stride=%d", i, j, w, h,
|
|
&entry->dma_addr,
|
|
usergart[i].stride_pfn << PAGE_SHIFT);
|
|
}
|
|
}
|
|
|
|
priv->usergart = usergart;
|
|
priv->has_dmm = true;
|
|
}
|
|
|
|
void omap_gem_deinit(struct drm_device *dev)
|
|
{
|
|
struct omap_drm_private *priv = dev->dev_private;
|
|
|
|
/* I believe we can rely on there being no more outstanding GEM
|
|
* objects which could depend on usergart/dmm at this point.
|
|
*/
|
|
kfree(priv->usergart);
|
|
}
|