threeeye
bc1d038eac
Squashed backup commit (no shallow-clone history issues) of xiaomi-mt6833-dev/kernel_xiaomi_mt6833 (lineage-23.2 branch, upstream commit 9eece662e) plus all fixes applied to get everpal_defconfig building clean against a modern (GCC 15.2.0) toolchain -- see the previous commit message on the lineage-23.2 branch (also in this repo history is not available here since this is a squashed snapshot; full incremental history lives in the local DL380 checkout and the upstream GitHub remote). Upstream: https://github.com/xiaomi-mt6833-dev/kernel_xiaomi_mt6833 (lineage-23.2)
125 lines
3.6 KiB
C
125 lines
3.6 KiB
C
/*
|
|
* Copyright (c) 2017 MediaTek Inc.
|
|
* Author: Fish Wu <fish.wu@mediatek.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*/
|
|
|
|
#include <linux/slab.h>
|
|
#include <linux/module.h>
|
|
#include <linux/dma-mapping.h>
|
|
#include <linux/vmalloc.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/sched.h>
|
|
#include <linux/file.h>
|
|
|
|
#include "vpubuf-core.h"
|
|
#include "vpubuf-memops.h"
|
|
#if 0 /* to do */
|
|
/**
|
|
* vpu_create_framevec() - map virtual addresses to pfns
|
|
* @start: Virtual user address where we start mapping
|
|
* @length: Length of a range to map
|
|
* @write: Should we map for writing into the area
|
|
*
|
|
* This function allocates and fills in a vector with pfns corresponding to
|
|
* virtual address range passed in arguments. If pfns have corresponding pages,
|
|
* page references are also grabbed to pin pages in memory. The function
|
|
* returns pointer to the vector on success and error pointer in case of
|
|
* failure. Returned vector needs to be freed via vpu_destroy_pfnvec().
|
|
*/
|
|
struct frame_vector *vpu_create_framevec(unsigned long start,
|
|
unsigned long length, bool write)
|
|
{
|
|
int ret;
|
|
unsigned long first, last;
|
|
unsigned long nr;
|
|
struct frame_vector *vec;
|
|
|
|
first = start >> PAGE_SHIFT;
|
|
last = (start + length - 1) >> PAGE_SHIFT;
|
|
nr = last - first + 1;
|
|
vec = frame_vector_create(nr);
|
|
if (!vec)
|
|
return ERR_PTR(-ENOMEM);
|
|
ret = get_vaddr_frames(start & PAGE_MASK, nr, write, true, vec);
|
|
if (ret < 0)
|
|
goto out_destroy;
|
|
/* We accept only complete set of PFNs */
|
|
if (ret != nr) {
|
|
ret = -EFAULT;
|
|
goto out_release;
|
|
}
|
|
return vec;
|
|
out_release:
|
|
put_vaddr_frames(vec);
|
|
out_destroy:
|
|
frame_vector_destroy(vec);
|
|
return ERR_PTR(ret);
|
|
}
|
|
|
|
/**
|
|
* vpu_destroy_framevec() - release vector of mapped pfns
|
|
* @vec: vector of pfns / pages to release
|
|
*
|
|
* This releases references to all pages in the vector @vec (if corresponding
|
|
* pfns are backed by pages) and frees the passed vector.
|
|
*/
|
|
void vpu_destroy_framevec(struct frame_vector *vec)
|
|
{
|
|
put_vaddr_frames(vec);
|
|
frame_vector_destroy(vec);
|
|
}
|
|
#endif
|
|
/**
|
|
* vpu_common_vm_open() - increase refcount of the vma
|
|
* @vma: virtual memory region for the mapping
|
|
*
|
|
* This function adds another user to the provided vma. It expects
|
|
* struct vpu_vmarea_handler pointer in vma->vm_private_data.
|
|
*/
|
|
static void vpu_common_vm_open(struct vm_area_struct *vma)
|
|
{
|
|
struct vpu_vmarea_handler *h = vma->vm_private_data;
|
|
|
|
pr_debug("%s: %p, refcount: %d, vma: %08lx-%08lx\n",
|
|
__func__, h, atomic_read(h->refcount), vma->vm_start,
|
|
vma->vm_end);
|
|
|
|
atomic_inc(h->refcount);
|
|
}
|
|
|
|
/**
|
|
* vpu_common_vm_close() - decrease refcount of the vma
|
|
* @vma: virtual memory region for the mapping
|
|
*
|
|
* This function releases the user from the provided vma. It expects
|
|
* struct vpu_vmarea_handler pointer in vma->vm_private_data.
|
|
*/
|
|
static void vpu_common_vm_close(struct vm_area_struct *vma)
|
|
{
|
|
struct vpu_vmarea_handler *h = vma->vm_private_data;
|
|
|
|
pr_debug("%s: %p, refcount: %d, vma: %08lx-%08lx\n",
|
|
__func__, h, atomic_read(h->refcount), vma->vm_start,
|
|
vma->vm_end);
|
|
|
|
h->put(h->arg);
|
|
}
|
|
|
|
/**
|
|
* vpu_common_vm_ops - common vm_ops used for tracking refcount of mmaped
|
|
* video buffers
|
|
*/
|
|
const struct vm_operations_struct vpu_common_vm_ops = {
|
|
.open = vpu_common_vm_open,
|
|
.close = vpu_common_vm_close,
|
|
};
|