linux/drivers/gpu/drm/msm/msm_gem.c
Rob Clark 1c4997fe41 drm/msm: no mmu is only error if not using vram carveout
Signed-off-by: Rob Clark <robdclark@gmail.com>
2014-08-04 11:55:29 -04:00

702 lines
17 KiB
C

/*
* Copyright (C) 2013 Red Hat
* Author: Rob Clark <robdclark@gmail.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.
*
* You should have received a copy of the GNU General Public License along with
* this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/spinlock.h>
#include <linux/shmem_fs.h>
#include <linux/dma-buf.h>
#include "msm_drv.h"
#include "msm_gem.h"
#include "msm_gpu.h"
#include "msm_mmu.h"
static dma_addr_t physaddr(struct drm_gem_object *obj)
{
struct msm_gem_object *msm_obj = to_msm_bo(obj);
struct msm_drm_private *priv = obj->dev->dev_private;
return (((dma_addr_t)msm_obj->vram_node->start) << PAGE_SHIFT) +
priv->vram.paddr;
}
/* allocate pages from VRAM carveout, used when no IOMMU: */
static struct page **get_pages_vram(struct drm_gem_object *obj,
int npages)
{
struct msm_gem_object *msm_obj = to_msm_bo(obj);
struct msm_drm_private *priv = obj->dev->dev_private;
dma_addr_t paddr;
struct page **p;
int ret, i;
p = drm_malloc_ab(npages, sizeof(struct page *));
if (!p)
return ERR_PTR(-ENOMEM);
ret = drm_mm_insert_node(&priv->vram.mm, msm_obj->vram_node,
npages, 0, DRM_MM_SEARCH_DEFAULT);
if (ret) {
drm_free_large(p);
return ERR_PTR(ret);
}
paddr = physaddr(obj);
for (i = 0; i < npages; i++) {
p[i] = phys_to_page(paddr);
paddr += PAGE_SIZE;
}
return p;
}
/* called with dev->struct_mutex held */
static struct page **get_pages(struct drm_gem_object *obj)
{
struct msm_gem_object *msm_obj = to_msm_bo(obj);
if (!msm_obj->pages) {
struct drm_device *dev = obj->dev;
struct page **p;
int npages = obj->size >> PAGE_SHIFT;
if (iommu_present(&platform_bus_type))
p = drm_gem_get_pages(obj);
else
p = get_pages_vram(obj, npages);
if (IS_ERR(p)) {
dev_err(dev->dev, "could not get pages: %ld\n",
PTR_ERR(p));
return p;
}
msm_obj->sgt = drm_prime_pages_to_sg(p, npages);
if (IS_ERR(msm_obj->sgt)) {
dev_err(dev->dev, "failed to allocate sgt\n");
return ERR_CAST(msm_obj->sgt);
}
msm_obj->pages = p;
/* For non-cached buffers, ensure the new pages are clean
* because display controller, GPU, etc. are not coherent:
*/
if (msm_obj->flags & (MSM_BO_WC|MSM_BO_UNCACHED))
dma_map_sg(dev->dev, msm_obj->sgt->sgl,
msm_obj->sgt->nents, DMA_BIDIRECTIONAL);
}
return msm_obj->pages;
}
static void put_pages(struct drm_gem_object *obj)
{
struct msm_gem_object *msm_obj = to_msm_bo(obj);
if (msm_obj->pages) {
/* For non-cached buffers, ensure the new pages are clean
* because display controller, GPU, etc. are not coherent:
*/
if (msm_obj->flags & (MSM_BO_WC|MSM_BO_UNCACHED))
dma_unmap_sg(obj->dev->dev, msm_obj->sgt->sgl,
msm_obj->sgt->nents, DMA_BIDIRECTIONAL);
sg_free_table(msm_obj->sgt);
kfree(msm_obj->sgt);
if (iommu_present(&platform_bus_type))
drm_gem_put_pages(obj, msm_obj->pages, true, false);
else {
drm_mm_remove_node(msm_obj->vram_node);
drm_free_large(msm_obj->pages);
}
msm_obj->pages = NULL;
}
}
struct page **msm_gem_get_pages(struct drm_gem_object *obj)
{
struct drm_device *dev = obj->dev;
struct page **p;
mutex_lock(&dev->struct_mutex);
p = get_pages(obj);
mutex_unlock(&dev->struct_mutex);
return p;
}
void msm_gem_put_pages(struct drm_gem_object *obj)
{
/* when we start tracking the pin count, then do something here */
}
int msm_gem_mmap_obj(struct drm_gem_object *obj,
struct vm_area_struct *vma)
{
struct msm_gem_object *msm_obj = to_msm_bo(obj);
vma->vm_flags &= ~VM_PFNMAP;
vma->vm_flags |= VM_MIXEDMAP;
if (msm_obj->flags & MSM_BO_WC) {
vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
} else if (msm_obj->flags & MSM_BO_UNCACHED) {
vma->vm_page_prot = pgprot_noncached(vm_get_page_prot(vma->vm_flags));
} else {
/*
* 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)
*/
fput(vma->vm_file);
get_file(obj->filp);
vma->vm_pgoff = 0;
vma->vm_file = obj->filp;
vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
}
return 0;
}
int msm_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 msm_gem_mmap_obj(vma->vm_private_data, vma);
}
int msm_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
{
struct drm_gem_object *obj = vma->vm_private_data;
struct drm_device *dev = obj->dev;
struct page **pages;
unsigned long pfn;
pgoff_t pgoff;
int ret;
/* Make sure we don't parallel update on a fault, nor move or remove
* something from beneath our feet
*/
ret = mutex_lock_interruptible(&dev->struct_mutex);
if (ret)
goto out;
/* make sure we have pages attached now */
pages = get_pages(obj);
if (IS_ERR(pages)) {
ret = PTR_ERR(pages);
goto out_unlock;
}
/* We don't use vmf->pgoff since that has the fake offset: */
pgoff = ((unsigned long)vmf->virtual_address -
vma->vm_start) >> PAGE_SHIFT;
pfn = page_to_pfn(pages[pgoff]);
VERB("Inserting %p pfn %lx, pa %lx", vmf->virtual_address,
pfn, pfn << PAGE_SHIFT);
ret = vm_insert_mixed(vma, (unsigned long)vmf->virtual_address, pfn);
out_unlock:
mutex_unlock(&dev->struct_mutex);
out:
switch (ret) {
case -EAGAIN:
case 0:
case -ERESTARTSYS:
case -EINTR:
case -EBUSY:
/*
* EBUSY is ok: this just means that another thread
* already did the job.
*/
return VM_FAULT_NOPAGE;
case -ENOMEM:
return VM_FAULT_OOM;
default:
return VM_FAULT_SIGBUS;
}
}
/** get mmap offset */
static uint64_t mmap_offset(struct drm_gem_object *obj)
{
struct drm_device *dev = obj->dev;
int ret;
WARN_ON(!mutex_is_locked(&dev->struct_mutex));
/* Make it mmapable */
ret = drm_gem_create_mmap_offset(obj);
if (ret) {
dev_err(dev->dev, "could not allocate mmap offset\n");
return 0;
}
return drm_vma_node_offset_addr(&obj->vma_node);
}
uint64_t msm_gem_mmap_offset(struct drm_gem_object *obj)
{
uint64_t offset;
mutex_lock(&obj->dev->struct_mutex);
offset = mmap_offset(obj);
mutex_unlock(&obj->dev->struct_mutex);
return offset;
}
/* should be called under struct_mutex.. although it can be called
* from atomic context without struct_mutex to acquire an extra
* iova ref if you know one is already held.
*
* That means when I do eventually need to add support for unpinning
* the refcnt counter needs to be atomic_t.
*/
int msm_gem_get_iova_locked(struct drm_gem_object *obj, int id,
uint32_t *iova)
{
struct msm_gem_object *msm_obj = to_msm_bo(obj);
int ret = 0;
if (!msm_obj->domain[id].iova) {
struct msm_drm_private *priv = obj->dev->dev_private;
struct page **pages = get_pages(obj);
if (IS_ERR(pages))
return PTR_ERR(pages);
if (iommu_present(&platform_bus_type)) {
struct msm_mmu *mmu = priv->mmus[id];
uint32_t offset;
if (WARN_ON(!mmu))
return -EINVAL;
offset = (uint32_t)mmap_offset(obj);
ret = mmu->funcs->map(mmu, offset, msm_obj->sgt,
obj->size, IOMMU_READ | IOMMU_WRITE);
msm_obj->domain[id].iova = offset;
} else {
msm_obj->domain[id].iova = physaddr(obj);
}
}
if (!ret)
*iova = msm_obj->domain[id].iova;
return ret;
}
int msm_gem_get_iova(struct drm_gem_object *obj, int id, uint32_t *iova)
{
struct msm_gem_object *msm_obj = to_msm_bo(obj);
int ret;
/* this is safe right now because we don't unmap until the
* bo is deleted:
*/
if (msm_obj->domain[id].iova) {
*iova = msm_obj->domain[id].iova;
return 0;
}
mutex_lock(&obj->dev->struct_mutex);
ret = msm_gem_get_iova_locked(obj, id, iova);
mutex_unlock(&obj->dev->struct_mutex);
return ret;
}
void msm_gem_put_iova(struct drm_gem_object *obj, int id)
{
// XXX TODO ..
// NOTE: probably don't need a _locked() version.. we wouldn't
// normally unmap here, but instead just mark that it could be
// unmapped (if the iova refcnt drops to zero), but then later
// if another _get_iova_locked() fails we can start unmapping
// things that are no longer needed..
}
int msm_gem_dumb_create(struct drm_file *file, struct drm_device *dev,
struct drm_mode_create_dumb *args)
{
args->pitch = align_pitch(args->width, args->bpp);
args->size = PAGE_ALIGN(args->pitch * args->height);
return msm_gem_new_handle(dev, file, args->size,
MSM_BO_SCANOUT | MSM_BO_WC, &args->handle);
}
int msm_gem_dumb_map_offset(struct drm_file *file, struct drm_device *dev,
uint32_t handle, uint64_t *offset)
{
struct drm_gem_object *obj;
int ret = 0;
/* GEM does all our handle to object mapping */
obj = drm_gem_object_lookup(dev, file, handle);
if (obj == NULL) {
ret = -ENOENT;
goto fail;
}
*offset = msm_gem_mmap_offset(obj);
drm_gem_object_unreference_unlocked(obj);
fail:
return ret;
}
void *msm_gem_vaddr_locked(struct drm_gem_object *obj)
{
struct msm_gem_object *msm_obj = to_msm_bo(obj);
WARN_ON(!mutex_is_locked(&obj->dev->struct_mutex));
if (!msm_obj->vaddr) {
struct page **pages = get_pages(obj);
if (IS_ERR(pages))
return ERR_CAST(pages);
msm_obj->vaddr = vmap(pages, obj->size >> PAGE_SHIFT,
VM_MAP, pgprot_writecombine(PAGE_KERNEL));
}
return msm_obj->vaddr;
}
void *msm_gem_vaddr(struct drm_gem_object *obj)
{
void *ret;
mutex_lock(&obj->dev->struct_mutex);
ret = msm_gem_vaddr_locked(obj);
mutex_unlock(&obj->dev->struct_mutex);
return ret;
}
/* setup callback for when bo is no longer busy..
* TODO probably want to differentiate read vs write..
*/
int msm_gem_queue_inactive_cb(struct drm_gem_object *obj,
struct msm_fence_cb *cb)
{
struct drm_device *dev = obj->dev;
struct msm_drm_private *priv = dev->dev_private;
struct msm_gem_object *msm_obj = to_msm_bo(obj);
int ret = 0;
mutex_lock(&dev->struct_mutex);
if (!list_empty(&cb->work.entry)) {
ret = -EINVAL;
} else if (is_active(msm_obj)) {
cb->fence = max(msm_obj->read_fence, msm_obj->write_fence);
list_add_tail(&cb->work.entry, &priv->fence_cbs);
} else {
queue_work(priv->wq, &cb->work);
}
mutex_unlock(&dev->struct_mutex);
return ret;
}
void msm_gem_move_to_active(struct drm_gem_object *obj,
struct msm_gpu *gpu, bool write, uint32_t fence)
{
struct msm_gem_object *msm_obj = to_msm_bo(obj);
msm_obj->gpu = gpu;
if (write)
msm_obj->write_fence = fence;
else
msm_obj->read_fence = fence;
list_del_init(&msm_obj->mm_list);
list_add_tail(&msm_obj->mm_list, &gpu->active_list);
}
void msm_gem_move_to_inactive(struct drm_gem_object *obj)
{
struct drm_device *dev = obj->dev;
struct msm_drm_private *priv = dev->dev_private;
struct msm_gem_object *msm_obj = to_msm_bo(obj);
WARN_ON(!mutex_is_locked(&dev->struct_mutex));
msm_obj->gpu = NULL;
msm_obj->read_fence = 0;
msm_obj->write_fence = 0;
list_del_init(&msm_obj->mm_list);
list_add_tail(&msm_obj->mm_list, &priv->inactive_list);
}
int msm_gem_cpu_prep(struct drm_gem_object *obj, uint32_t op,
struct timespec *timeout)
{
struct drm_device *dev = obj->dev;
struct msm_gem_object *msm_obj = to_msm_bo(obj);
int ret = 0;
if (is_active(msm_obj)) {
uint32_t fence = 0;
if (op & MSM_PREP_READ)
fence = msm_obj->write_fence;
if (op & MSM_PREP_WRITE)
fence = max(fence, msm_obj->read_fence);
if (op & MSM_PREP_NOSYNC)
timeout = NULL;
ret = msm_wait_fence_interruptable(dev, fence, timeout);
}
/* TODO cache maintenance */
return ret;
}
int msm_gem_cpu_fini(struct drm_gem_object *obj)
{
/* TODO cache maintenance */
return 0;
}
#ifdef CONFIG_DEBUG_FS
void msm_gem_describe(struct drm_gem_object *obj, struct seq_file *m)
{
struct drm_device *dev = obj->dev;
struct msm_gem_object *msm_obj = to_msm_bo(obj);
uint64_t off = drm_vma_node_start(&obj->vma_node);
WARN_ON(!mutex_is_locked(&dev->struct_mutex));
seq_printf(m, "%08x: %c(r=%u,w=%u) %2d (%2d) %08llx %p %d\n",
msm_obj->flags, is_active(msm_obj) ? 'A' : 'I',
msm_obj->read_fence, msm_obj->write_fence,
obj->name, obj->refcount.refcount.counter,
off, msm_obj->vaddr, obj->size);
}
void msm_gem_describe_objects(struct list_head *list, struct seq_file *m)
{
struct msm_gem_object *msm_obj;
int count = 0;
size_t size = 0;
list_for_each_entry(msm_obj, list, mm_list) {
struct drm_gem_object *obj = &msm_obj->base;
seq_printf(m, " ");
msm_gem_describe(obj, m);
count++;
size += obj->size;
}
seq_printf(m, "Total %d objects, %zu bytes\n", count, size);
}
#endif
void msm_gem_free_object(struct drm_gem_object *obj)
{
struct drm_device *dev = obj->dev;
struct msm_drm_private *priv = obj->dev->dev_private;
struct msm_gem_object *msm_obj = to_msm_bo(obj);
int id;
WARN_ON(!mutex_is_locked(&dev->struct_mutex));
/* object should not be on active list: */
WARN_ON(is_active(msm_obj));
list_del(&msm_obj->mm_list);
for (id = 0; id < ARRAY_SIZE(msm_obj->domain); id++) {
struct msm_mmu *mmu = priv->mmus[id];
if (mmu && msm_obj->domain[id].iova) {
uint32_t offset = (uint32_t)mmap_offset(obj);
mmu->funcs->unmap(mmu, offset, msm_obj->sgt, obj->size);
}
}
drm_gem_free_mmap_offset(obj);
if (obj->import_attach) {
if (msm_obj->vaddr)
dma_buf_vunmap(obj->import_attach->dmabuf, msm_obj->vaddr);
/* Don't drop the pages for imported dmabuf, as they are not
* ours, just free the array we allocated:
*/
if (msm_obj->pages)
drm_free_large(msm_obj->pages);
} else {
if (msm_obj->vaddr)
vunmap(msm_obj->vaddr);
put_pages(obj);
}
if (msm_obj->resv == &msm_obj->_resv)
reservation_object_fini(msm_obj->resv);
drm_gem_object_release(obj);
kfree(msm_obj);
}
/* convenience method to construct a GEM buffer object, and userspace handle */
int msm_gem_new_handle(struct drm_device *dev, struct drm_file *file,
uint32_t size, uint32_t flags, uint32_t *handle)
{
struct drm_gem_object *obj;
int ret;
ret = mutex_lock_interruptible(&dev->struct_mutex);
if (ret)
return ret;
obj = msm_gem_new(dev, size, flags);
mutex_unlock(&dev->struct_mutex);
if (IS_ERR(obj))
return PTR_ERR(obj);
ret = drm_gem_handle_create(file, obj, handle);
/* drop reference from allocate - handle holds it now */
drm_gem_object_unreference_unlocked(obj);
return ret;
}
static int msm_gem_new_impl(struct drm_device *dev,
uint32_t size, uint32_t flags,
struct drm_gem_object **obj)
{
struct msm_drm_private *priv = dev->dev_private;
struct msm_gem_object *msm_obj;
unsigned sz;
switch (flags & MSM_BO_CACHE_MASK) {
case MSM_BO_UNCACHED:
case MSM_BO_CACHED:
case MSM_BO_WC:
break;
default:
dev_err(dev->dev, "invalid cache flag: %x\n",
(flags & MSM_BO_CACHE_MASK));
return -EINVAL;
}
sz = sizeof(*msm_obj);
if (!iommu_present(&platform_bus_type))
sz += sizeof(struct drm_mm_node);
msm_obj = kzalloc(sz, GFP_KERNEL);
if (!msm_obj)
return -ENOMEM;
if (!iommu_present(&platform_bus_type))
msm_obj->vram_node = (void *)&msm_obj[1];
msm_obj->flags = flags;
msm_obj->resv = &msm_obj->_resv;
reservation_object_init(msm_obj->resv);
INIT_LIST_HEAD(&msm_obj->submit_entry);
list_add_tail(&msm_obj->mm_list, &priv->inactive_list);
*obj = &msm_obj->base;
return 0;
}
struct drm_gem_object *msm_gem_new(struct drm_device *dev,
uint32_t size, uint32_t flags)
{
struct drm_gem_object *obj = NULL;
int ret;
WARN_ON(!mutex_is_locked(&dev->struct_mutex));
size = PAGE_ALIGN(size);
ret = msm_gem_new_impl(dev, size, flags, &obj);
if (ret)
goto fail;
if (iommu_present(&platform_bus_type)) {
ret = drm_gem_object_init(dev, obj, size);
if (ret)
goto fail;
} else {
drm_gem_private_object_init(dev, obj, size);
}
return obj;
fail:
if (obj)
drm_gem_object_unreference(obj);
return ERR_PTR(ret);
}
struct drm_gem_object *msm_gem_import(struct drm_device *dev,
uint32_t size, struct sg_table *sgt)
{
struct msm_gem_object *msm_obj;
struct drm_gem_object *obj;
int ret, npages;
/* if we don't have IOMMU, don't bother pretending we can import: */
if (!iommu_present(&platform_bus_type)) {
dev_err(dev->dev, "cannot import without IOMMU\n");
return ERR_PTR(-EINVAL);
}
size = PAGE_ALIGN(size);
ret = msm_gem_new_impl(dev, size, MSM_BO_WC, &obj);
if (ret)
goto fail;
drm_gem_private_object_init(dev, obj, size);
npages = size / PAGE_SIZE;
msm_obj = to_msm_bo(obj);
msm_obj->sgt = sgt;
msm_obj->pages = drm_malloc_ab(npages, sizeof(struct page *));
if (!msm_obj->pages) {
ret = -ENOMEM;
goto fail;
}
ret = drm_prime_sg_to_page_addr_arrays(sgt, msm_obj->pages, NULL, npages);
if (ret)
goto fail;
return obj;
fail:
if (obj)
drm_gem_object_unreference_unlocked(obj);
return ERR_PTR(ret);
}