![Dave Jiang](/assets/img/avatar_default.png)
->fault(), ->page_mkwrite(), and ->pfn_mkwrite() calls do not need to take a vma and vmf parameter when the vma already resides in vmf. Remove the vma parameter to simplify things. [arnd@arndb.de: fix ARM build] Link: http://lkml.kernel.org/r/20170125223558.1451224-1-arnd@arndb.de Link: http://lkml.kernel.org/r/148521301778.19116.10840599906674778980.stgit@djiang5-desk3.ch.intel.com Signed-off-by: Dave Jiang <dave.jiang@intel.com> Signed-off-by: Arnd Bergmann <arnd@arndb.de> Reviewed-by: Ross Zwisler <ross.zwisler@linux.intel.com> Cc: Theodore Ts'o <tytso@mit.edu> Cc: Darrick J. Wong <darrick.wong@oracle.com> Cc: Matthew Wilcox <mawilcox@microsoft.com> Cc: Dave Hansen <dave.hansen@intel.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Jan Kara <jack@suse.com> Cc: Dan Williams <dan.j.williams@intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
615 lines
14 KiB
C
615 lines
14 KiB
C
/*
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* Copyright (C) 2012 Russell King
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*/
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#include <linux/dma-buf.h>
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#include <linux/dma-mapping.h>
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#include <linux/shmem_fs.h>
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#include <drm/drmP.h>
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#include "armada_drm.h"
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#include "armada_gem.h"
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#include <drm/armada_drm.h>
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#include "armada_ioctlP.h"
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static int armada_gem_vm_fault(struct vm_fault *vmf)
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{
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struct drm_gem_object *gobj = vmf->vma->vm_private_data;
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struct armada_gem_object *obj = drm_to_armada_gem(gobj);
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unsigned long pfn = obj->phys_addr >> PAGE_SHIFT;
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int ret;
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pfn += (vmf->address - vmf->vma->vm_start) >> PAGE_SHIFT;
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ret = vm_insert_pfn(vmf->vma, vmf->address, pfn);
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switch (ret) {
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case 0:
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case -EBUSY:
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return VM_FAULT_NOPAGE;
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case -ENOMEM:
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return VM_FAULT_OOM;
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default:
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return VM_FAULT_SIGBUS;
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}
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}
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const struct vm_operations_struct armada_gem_vm_ops = {
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.fault = armada_gem_vm_fault,
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.open = drm_gem_vm_open,
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.close = drm_gem_vm_close,
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};
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static size_t roundup_gem_size(size_t size)
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{
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return roundup(size, PAGE_SIZE);
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}
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void armada_gem_free_object(struct drm_gem_object *obj)
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{
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struct armada_gem_object *dobj = drm_to_armada_gem(obj);
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struct armada_private *priv = obj->dev->dev_private;
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DRM_DEBUG_DRIVER("release obj %p\n", dobj);
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drm_gem_free_mmap_offset(&dobj->obj);
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might_lock(&priv->linear_lock);
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if (dobj->page) {
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/* page backed memory */
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unsigned int order = get_order(dobj->obj.size);
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__free_pages(dobj->page, order);
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} else if (dobj->linear) {
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/* linear backed memory */
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mutex_lock(&priv->linear_lock);
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drm_mm_remove_node(dobj->linear);
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mutex_unlock(&priv->linear_lock);
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kfree(dobj->linear);
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if (dobj->addr)
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iounmap(dobj->addr);
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}
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if (dobj->obj.import_attach) {
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/* We only ever display imported data */
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if (dobj->sgt)
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dma_buf_unmap_attachment(dobj->obj.import_attach,
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dobj->sgt, DMA_TO_DEVICE);
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drm_prime_gem_destroy(&dobj->obj, NULL);
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}
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drm_gem_object_release(&dobj->obj);
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kfree(dobj);
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}
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int
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armada_gem_linear_back(struct drm_device *dev, struct armada_gem_object *obj)
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{
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struct armada_private *priv = dev->dev_private;
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size_t size = obj->obj.size;
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if (obj->page || obj->linear)
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return 0;
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/*
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* If it is a small allocation (typically cursor, which will
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* be 32x64 or 64x32 ARGB pixels) try to get it from the system.
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* Framebuffers will never be this small (our minimum size for
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* framebuffers is larger than this anyway.) Such objects are
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* only accessed by the CPU so we don't need any special handing
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* here.
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*/
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if (size <= 8192) {
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unsigned int order = get_order(size);
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struct page *p = alloc_pages(GFP_KERNEL, order);
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if (p) {
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obj->addr = page_address(p);
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obj->phys_addr = page_to_phys(p);
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obj->page = p;
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memset(obj->addr, 0, PAGE_ALIGN(size));
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}
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}
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/*
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* We could grab something from CMA if it's enabled, but that
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* involves building in a problem:
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*
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* CMA's interface uses dma_alloc_coherent(), which provides us
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* with an CPU virtual address and a device address.
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*
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* The CPU virtual address may be either an address in the kernel
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* direct mapped region (for example, as it would be on x86) or
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* it may be remapped into another part of kernel memory space
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* (eg, as it would be on ARM.) This means virt_to_phys() on the
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* returned virtual address is invalid depending on the architecture
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* implementation.
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*
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* The device address may also not be a physical address; it may
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* be that there is some kind of remapping between the device and
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* system RAM, which makes the use of the device address also
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* unsafe to re-use as a physical address.
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*
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* This makes DRM usage of dma_alloc_coherent() in a generic way
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* at best very questionable and unsafe.
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*/
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/* Otherwise, grab it from our linear allocation */
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if (!obj->page) {
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struct drm_mm_node *node;
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unsigned align = min_t(unsigned, size, SZ_2M);
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void __iomem *ptr;
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int ret;
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node = kzalloc(sizeof(*node), GFP_KERNEL);
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if (!node)
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return -ENOSPC;
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mutex_lock(&priv->linear_lock);
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ret = drm_mm_insert_node_generic(&priv->linear, node,
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size, align, 0, 0);
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mutex_unlock(&priv->linear_lock);
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if (ret) {
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kfree(node);
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return ret;
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}
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obj->linear = node;
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/* Ensure that the memory we're returning is cleared. */
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ptr = ioremap_wc(obj->linear->start, size);
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if (!ptr) {
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mutex_lock(&priv->linear_lock);
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drm_mm_remove_node(obj->linear);
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mutex_unlock(&priv->linear_lock);
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kfree(obj->linear);
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obj->linear = NULL;
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return -ENOMEM;
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}
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memset_io(ptr, 0, size);
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iounmap(ptr);
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obj->phys_addr = obj->linear->start;
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obj->dev_addr = obj->linear->start;
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}
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DRM_DEBUG_DRIVER("obj %p phys %#llx dev %#llx\n", obj,
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(unsigned long long)obj->phys_addr,
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(unsigned long long)obj->dev_addr);
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return 0;
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}
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void *
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armada_gem_map_object(struct drm_device *dev, struct armada_gem_object *dobj)
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{
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/* only linear objects need to be ioremap'd */
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if (!dobj->addr && dobj->linear)
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dobj->addr = ioremap_wc(dobj->phys_addr, dobj->obj.size);
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return dobj->addr;
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}
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struct armada_gem_object *
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armada_gem_alloc_private_object(struct drm_device *dev, size_t size)
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{
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struct armada_gem_object *obj;
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size = roundup_gem_size(size);
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obj = kzalloc(sizeof(*obj), GFP_KERNEL);
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if (!obj)
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return NULL;
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drm_gem_private_object_init(dev, &obj->obj, size);
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obj->dev_addr = DMA_ERROR_CODE;
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DRM_DEBUG_DRIVER("alloc private obj %p size %zu\n", obj, size);
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return obj;
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}
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static struct armada_gem_object *armada_gem_alloc_object(struct drm_device *dev,
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size_t size)
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{
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struct armada_gem_object *obj;
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struct address_space *mapping;
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size = roundup_gem_size(size);
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obj = kzalloc(sizeof(*obj), GFP_KERNEL);
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if (!obj)
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return NULL;
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if (drm_gem_object_init(dev, &obj->obj, size)) {
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kfree(obj);
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return NULL;
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}
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obj->dev_addr = DMA_ERROR_CODE;
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mapping = obj->obj.filp->f_mapping;
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mapping_set_gfp_mask(mapping, GFP_HIGHUSER | __GFP_RECLAIMABLE);
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DRM_DEBUG_DRIVER("alloc obj %p size %zu\n", obj, size);
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return obj;
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}
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/* Dumb alloc support */
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int armada_gem_dumb_create(struct drm_file *file, struct drm_device *dev,
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struct drm_mode_create_dumb *args)
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{
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struct armada_gem_object *dobj;
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u32 handle;
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size_t size;
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int ret;
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args->pitch = armada_pitch(args->width, args->bpp);
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args->size = size = args->pitch * args->height;
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dobj = armada_gem_alloc_private_object(dev, size);
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if (dobj == NULL)
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return -ENOMEM;
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ret = armada_gem_linear_back(dev, dobj);
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if (ret)
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goto err;
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ret = drm_gem_handle_create(file, &dobj->obj, &handle);
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if (ret)
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goto err;
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args->handle = handle;
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/* drop reference from allocate - handle holds it now */
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DRM_DEBUG_DRIVER("obj %p size %zu handle %#x\n", dobj, size, handle);
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err:
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drm_gem_object_unreference_unlocked(&dobj->obj);
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return ret;
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}
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int armada_gem_dumb_map_offset(struct drm_file *file, struct drm_device *dev,
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uint32_t handle, uint64_t *offset)
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{
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struct armada_gem_object *obj;
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int ret = 0;
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obj = armada_gem_object_lookup(file, handle);
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if (!obj) {
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DRM_ERROR("failed to lookup gem object\n");
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return -EINVAL;
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}
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/* Don't allow imported objects to be mapped */
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if (obj->obj.import_attach) {
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ret = -EINVAL;
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goto err_unref;
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}
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ret = drm_gem_create_mmap_offset(&obj->obj);
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if (ret == 0) {
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*offset = drm_vma_node_offset_addr(&obj->obj.vma_node);
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DRM_DEBUG_DRIVER("handle %#x offset %llx\n", handle, *offset);
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}
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err_unref:
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drm_gem_object_unreference_unlocked(&obj->obj);
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return ret;
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}
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int armada_gem_dumb_destroy(struct drm_file *file, struct drm_device *dev,
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uint32_t handle)
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{
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return drm_gem_handle_delete(file, handle);
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}
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/* Private driver gem ioctls */
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int armada_gem_create_ioctl(struct drm_device *dev, void *data,
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struct drm_file *file)
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{
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struct drm_armada_gem_create *args = data;
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struct armada_gem_object *dobj;
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size_t size;
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u32 handle;
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int ret;
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if (args->size == 0)
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return -ENOMEM;
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size = args->size;
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dobj = armada_gem_alloc_object(dev, size);
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if (dobj == NULL)
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return -ENOMEM;
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ret = drm_gem_handle_create(file, &dobj->obj, &handle);
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if (ret)
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goto err;
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args->handle = handle;
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/* drop reference from allocate - handle holds it now */
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DRM_DEBUG_DRIVER("obj %p size %zu handle %#x\n", dobj, size, handle);
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err:
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drm_gem_object_unreference_unlocked(&dobj->obj);
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return ret;
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}
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/* Map a shmem-backed object into process memory space */
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int armada_gem_mmap_ioctl(struct drm_device *dev, void *data,
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struct drm_file *file)
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{
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struct drm_armada_gem_mmap *args = data;
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struct armada_gem_object *dobj;
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unsigned long addr;
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dobj = armada_gem_object_lookup(file, args->handle);
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if (dobj == NULL)
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return -ENOENT;
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if (!dobj->obj.filp) {
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drm_gem_object_unreference_unlocked(&dobj->obj);
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return -EINVAL;
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}
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addr = vm_mmap(dobj->obj.filp, 0, args->size, PROT_READ | PROT_WRITE,
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MAP_SHARED, args->offset);
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drm_gem_object_unreference_unlocked(&dobj->obj);
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if (IS_ERR_VALUE(addr))
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return addr;
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args->addr = addr;
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return 0;
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}
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int armada_gem_pwrite_ioctl(struct drm_device *dev, void *data,
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struct drm_file *file)
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{
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struct drm_armada_gem_pwrite *args = data;
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struct armada_gem_object *dobj;
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char __user *ptr;
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int ret;
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DRM_DEBUG_DRIVER("handle %u off %u size %u ptr 0x%llx\n",
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args->handle, args->offset, args->size, args->ptr);
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if (args->size == 0)
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return 0;
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ptr = (char __user *)(uintptr_t)args->ptr;
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if (!access_ok(VERIFY_READ, ptr, args->size))
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return -EFAULT;
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ret = fault_in_pages_readable(ptr, args->size);
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if (ret)
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return ret;
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dobj = armada_gem_object_lookup(file, args->handle);
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if (dobj == NULL)
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return -ENOENT;
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/* Must be a kernel-mapped object */
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if (!dobj->addr)
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return -EINVAL;
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if (args->offset > dobj->obj.size ||
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args->size > dobj->obj.size - args->offset) {
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DRM_ERROR("invalid size: object size %u\n", dobj->obj.size);
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ret = -EINVAL;
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goto unref;
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}
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if (copy_from_user(dobj->addr + args->offset, ptr, args->size)) {
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ret = -EFAULT;
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} else if (dobj->update) {
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dobj->update(dobj->update_data);
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ret = 0;
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}
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unref:
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drm_gem_object_unreference_unlocked(&dobj->obj);
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return ret;
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}
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/* Prime support */
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static struct sg_table *
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armada_gem_prime_map_dma_buf(struct dma_buf_attachment *attach,
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enum dma_data_direction dir)
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{
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struct drm_gem_object *obj = attach->dmabuf->priv;
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struct armada_gem_object *dobj = drm_to_armada_gem(obj);
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struct scatterlist *sg;
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struct sg_table *sgt;
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int i, num;
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sgt = kmalloc(sizeof(*sgt), GFP_KERNEL);
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if (!sgt)
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return NULL;
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if (dobj->obj.filp) {
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struct address_space *mapping;
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int count;
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count = dobj->obj.size / PAGE_SIZE;
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if (sg_alloc_table(sgt, count, GFP_KERNEL))
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goto free_sgt;
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mapping = dobj->obj.filp->f_mapping;
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for_each_sg(sgt->sgl, sg, count, i) {
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struct page *page;
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page = shmem_read_mapping_page(mapping, i);
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if (IS_ERR(page)) {
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num = i;
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goto release;
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}
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sg_set_page(sg, page, PAGE_SIZE, 0);
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}
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if (dma_map_sg(attach->dev, sgt->sgl, sgt->nents, dir) == 0) {
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num = sgt->nents;
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goto release;
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}
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} else if (dobj->page) {
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/* Single contiguous page */
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if (sg_alloc_table(sgt, 1, GFP_KERNEL))
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goto free_sgt;
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sg_set_page(sgt->sgl, dobj->page, dobj->obj.size, 0);
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if (dma_map_sg(attach->dev, sgt->sgl, sgt->nents, dir) == 0)
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goto free_table;
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} else if (dobj->linear) {
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/* Single contiguous physical region - no struct page */
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if (sg_alloc_table(sgt, 1, GFP_KERNEL))
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goto free_sgt;
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sg_dma_address(sgt->sgl) = dobj->dev_addr;
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sg_dma_len(sgt->sgl) = dobj->obj.size;
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} else {
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goto free_sgt;
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}
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return sgt;
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release:
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for_each_sg(sgt->sgl, sg, num, i)
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put_page(sg_page(sg));
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free_table:
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sg_free_table(sgt);
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free_sgt:
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kfree(sgt);
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return NULL;
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}
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static void armada_gem_prime_unmap_dma_buf(struct dma_buf_attachment *attach,
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struct sg_table *sgt, enum dma_data_direction dir)
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{
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struct drm_gem_object *obj = attach->dmabuf->priv;
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struct armada_gem_object *dobj = drm_to_armada_gem(obj);
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int i;
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if (!dobj->linear)
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dma_unmap_sg(attach->dev, sgt->sgl, sgt->nents, dir);
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if (dobj->obj.filp) {
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struct scatterlist *sg;
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for_each_sg(sgt->sgl, sg, sgt->nents, i)
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put_page(sg_page(sg));
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}
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|
|
sg_free_table(sgt);
|
|
kfree(sgt);
|
|
}
|
|
|
|
static void *armada_gem_dmabuf_no_kmap(struct dma_buf *buf, unsigned long n)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
static void
|
|
armada_gem_dmabuf_no_kunmap(struct dma_buf *buf, unsigned long n, void *addr)
|
|
{
|
|
}
|
|
|
|
static int
|
|
armada_gem_dmabuf_mmap(struct dma_buf *buf, struct vm_area_struct *vma)
|
|
{
|
|
return -EINVAL;
|
|
}
|
|
|
|
static const struct dma_buf_ops armada_gem_prime_dmabuf_ops = {
|
|
.map_dma_buf = armada_gem_prime_map_dma_buf,
|
|
.unmap_dma_buf = armada_gem_prime_unmap_dma_buf,
|
|
.release = drm_gem_dmabuf_release,
|
|
.kmap_atomic = armada_gem_dmabuf_no_kmap,
|
|
.kunmap_atomic = armada_gem_dmabuf_no_kunmap,
|
|
.kmap = armada_gem_dmabuf_no_kmap,
|
|
.kunmap = armada_gem_dmabuf_no_kunmap,
|
|
.mmap = armada_gem_dmabuf_mmap,
|
|
};
|
|
|
|
struct dma_buf *
|
|
armada_gem_prime_export(struct drm_device *dev, struct drm_gem_object *obj,
|
|
int flags)
|
|
{
|
|
DEFINE_DMA_BUF_EXPORT_INFO(exp_info);
|
|
|
|
exp_info.ops = &armada_gem_prime_dmabuf_ops;
|
|
exp_info.size = obj->size;
|
|
exp_info.flags = O_RDWR;
|
|
exp_info.priv = obj;
|
|
|
|
return drm_gem_dmabuf_export(dev, &exp_info);
|
|
}
|
|
|
|
struct drm_gem_object *
|
|
armada_gem_prime_import(struct drm_device *dev, struct dma_buf *buf)
|
|
{
|
|
struct dma_buf_attachment *attach;
|
|
struct armada_gem_object *dobj;
|
|
|
|
if (buf->ops == &armada_gem_prime_dmabuf_ops) {
|
|
struct drm_gem_object *obj = buf->priv;
|
|
if (obj->dev == dev) {
|
|
/*
|
|
* Importing our own dmabuf(s) increases the
|
|
* refcount on the gem object itself.
|
|
*/
|
|
drm_gem_object_reference(obj);
|
|
return obj;
|
|
}
|
|
}
|
|
|
|
attach = dma_buf_attach(buf, dev->dev);
|
|
if (IS_ERR(attach))
|
|
return ERR_CAST(attach);
|
|
|
|
dobj = armada_gem_alloc_private_object(dev, buf->size);
|
|
if (!dobj) {
|
|
dma_buf_detach(buf, attach);
|
|
return ERR_PTR(-ENOMEM);
|
|
}
|
|
|
|
dobj->obj.import_attach = attach;
|
|
get_dma_buf(buf);
|
|
|
|
/*
|
|
* Don't call dma_buf_map_attachment() here - it maps the
|
|
* scatterlist immediately for DMA, and this is not always
|
|
* an appropriate thing to do.
|
|
*/
|
|
return &dobj->obj;
|
|
}
|
|
|
|
int armada_gem_map_import(struct armada_gem_object *dobj)
|
|
{
|
|
int ret;
|
|
|
|
dobj->sgt = dma_buf_map_attachment(dobj->obj.import_attach,
|
|
DMA_TO_DEVICE);
|
|
if (IS_ERR(dobj->sgt)) {
|
|
ret = PTR_ERR(dobj->sgt);
|
|
dobj->sgt = NULL;
|
|
DRM_ERROR("dma_buf_map_attachment() error: %d\n", ret);
|
|
return ret;
|
|
}
|
|
if (dobj->sgt->nents > 1) {
|
|
DRM_ERROR("dma_buf_map_attachment() returned an (unsupported) scattered list\n");
|
|
return -EINVAL;
|
|
}
|
|
if (sg_dma_len(dobj->sgt->sgl) < dobj->obj.size) {
|
|
DRM_ERROR("dma_buf_map_attachment() returned a small buffer\n");
|
|
return -EINVAL;
|
|
}
|
|
dobj->dev_addr = sg_dma_address(dobj->sgt->sgl);
|
|
return 0;
|
|
}
|