![Rob Clark](/assets/img/avatar_default.png)
Add a VRAM carveout that is used for systems which do not have an IOMMU. The VRAM carveout uses CMA. The arch code must setup a CMA pool for the device (preferrably in highmem.. a 256m-512m VRAM pool in lowmem is not cool). The user can configure the VRAM pool size using msm.vram module param. Technically, the abstraction of IOMMU behind msm_mmu is not strictly needed, but it simplifies the GEM code a bit, and will be useful later when I add support for a2xx devices with GPUMMU, so I decided to keep this part. It appears to be possible to configure the GPU to restrict access to addresses within the VRAM pool, but this is not done yet. So for now the GPU will refuse to load if there is no sort of mmu. Once address based limits are supported and tested to confirm that we aren't giving the GPU access to arbitrary memory, this restriction can be lifted Signed-off-by: Rob Clark <robdclark@gmail.com>
695 lines
16 KiB
C
695 lines
16 KiB
C
/*
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* Copyright (C) 2013 Red Hat
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* Author: Rob Clark <robdclark@gmail.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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* You should have received a copy of the GNU General Public License along with
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* this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <linux/spinlock.h>
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#include <linux/shmem_fs.h>
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#include <linux/dma-buf.h>
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#include "msm_drv.h"
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#include "msm_gem.h"
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#include "msm_gpu.h"
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#include "msm_mmu.h"
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static dma_addr_t physaddr(struct drm_gem_object *obj)
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{
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struct msm_gem_object *msm_obj = to_msm_bo(obj);
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struct msm_drm_private *priv = obj->dev->dev_private;
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return (((dma_addr_t)msm_obj->vram_node->start) << PAGE_SHIFT) +
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priv->vram.paddr;
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}
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/* allocate pages from VRAM carveout, used when no IOMMU: */
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static struct page **get_pages_vram(struct drm_gem_object *obj,
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int npages)
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{
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struct msm_gem_object *msm_obj = to_msm_bo(obj);
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struct msm_drm_private *priv = obj->dev->dev_private;
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dma_addr_t paddr;
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struct page **p;
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int ret, i;
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p = drm_malloc_ab(npages, sizeof(struct page *));
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if (!p)
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return ERR_PTR(-ENOMEM);
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ret = drm_mm_insert_node(&priv->vram.mm, msm_obj->vram_node,
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npages, 0, DRM_MM_SEARCH_DEFAULT);
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if (ret) {
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drm_free_large(p);
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return ERR_PTR(ret);
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}
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paddr = physaddr(obj);
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for (i = 0; i < npages; i++) {
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p[i] = phys_to_page(paddr);
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paddr += PAGE_SIZE;
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}
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return p;
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}
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/* called with dev->struct_mutex held */
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static struct page **get_pages(struct drm_gem_object *obj)
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{
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struct msm_gem_object *msm_obj = to_msm_bo(obj);
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if (!msm_obj->pages) {
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struct drm_device *dev = obj->dev;
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struct page **p;
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int npages = obj->size >> PAGE_SHIFT;
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if (iommu_present(&platform_bus_type))
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p = drm_gem_get_pages(obj, 0);
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else
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p = get_pages_vram(obj, npages);
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if (IS_ERR(p)) {
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dev_err(dev->dev, "could not get pages: %ld\n",
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PTR_ERR(p));
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return p;
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}
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msm_obj->sgt = drm_prime_pages_to_sg(p, npages);
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if (IS_ERR(msm_obj->sgt)) {
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dev_err(dev->dev, "failed to allocate sgt\n");
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return ERR_CAST(msm_obj->sgt);
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}
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msm_obj->pages = p;
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/* For non-cached buffers, ensure the new pages are clean
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* because display controller, GPU, etc. are not coherent:
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*/
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if (msm_obj->flags & (MSM_BO_WC|MSM_BO_UNCACHED))
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dma_map_sg(dev->dev, msm_obj->sgt->sgl,
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msm_obj->sgt->nents, DMA_BIDIRECTIONAL);
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}
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return msm_obj->pages;
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}
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static void put_pages(struct drm_gem_object *obj)
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{
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struct msm_gem_object *msm_obj = to_msm_bo(obj);
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if (msm_obj->pages) {
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/* For non-cached buffers, ensure the new pages are clean
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* because display controller, GPU, etc. are not coherent:
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*/
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if (msm_obj->flags & (MSM_BO_WC|MSM_BO_UNCACHED))
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dma_unmap_sg(obj->dev->dev, msm_obj->sgt->sgl,
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msm_obj->sgt->nents, DMA_BIDIRECTIONAL);
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sg_free_table(msm_obj->sgt);
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kfree(msm_obj->sgt);
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if (iommu_present(&platform_bus_type))
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drm_gem_put_pages(obj, msm_obj->pages, true, false);
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else
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drm_mm_remove_node(msm_obj->vram_node);
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msm_obj->pages = NULL;
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}
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}
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struct page **msm_gem_get_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 page **p;
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mutex_lock(&dev->struct_mutex);
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p = get_pages(obj);
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mutex_unlock(&dev->struct_mutex);
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return p;
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}
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void msm_gem_put_pages(struct drm_gem_object *obj)
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{
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/* when we start tracking the pin count, then do something here */
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}
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int msm_gem_mmap_obj(struct drm_gem_object *obj,
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struct vm_area_struct *vma)
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{
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struct msm_gem_object *msm_obj = to_msm_bo(obj);
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vma->vm_flags &= ~VM_PFNMAP;
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vma->vm_flags |= VM_MIXEDMAP;
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if (msm_obj->flags & MSM_BO_WC) {
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vma->vm_page_prot = pgprot_writecombine(vm_get_page_prot(vma->vm_flags));
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} else if (msm_obj->flags & MSM_BO_UNCACHED) {
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vma->vm_page_prot = pgprot_noncached(vm_get_page_prot(vma->vm_flags));
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} else {
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/*
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* Shunt off cached objs to shmem file so they have their own
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* address_space (so unmap_mapping_range does what we want,
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* in particular in the case of mmap'd dmabufs)
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*/
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fput(vma->vm_file);
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get_file(obj->filp);
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vma->vm_pgoff = 0;
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vma->vm_file = obj->filp;
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vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
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}
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return 0;
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}
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int msm_gem_mmap(struct file *filp, struct vm_area_struct *vma)
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{
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int ret;
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ret = drm_gem_mmap(filp, vma);
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if (ret) {
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DBG("mmap failed: %d", ret);
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return ret;
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}
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return msm_gem_mmap_obj(vma->vm_private_data, vma);
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}
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int msm_gem_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
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{
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struct drm_gem_object *obj = vma->vm_private_data;
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struct drm_device *dev = obj->dev;
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struct page **pages;
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unsigned long pfn;
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pgoff_t pgoff;
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int ret;
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/* Make sure we don't parallel update on a fault, nor move or remove
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* something from beneath our feet
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*/
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ret = mutex_lock_interruptible(&dev->struct_mutex);
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if (ret)
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goto out;
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/* make sure we have pages attached now */
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pages = get_pages(obj);
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if (IS_ERR(pages)) {
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ret = PTR_ERR(pages);
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goto out_unlock;
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}
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/* We don't use vmf->pgoff since that has the fake offset: */
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pgoff = ((unsigned long)vmf->virtual_address -
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vma->vm_start) >> PAGE_SHIFT;
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pfn = page_to_pfn(pages[pgoff]);
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VERB("Inserting %p pfn %lx, pa %lx", vmf->virtual_address,
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pfn, pfn << PAGE_SHIFT);
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ret = vm_insert_mixed(vma, (unsigned long)vmf->virtual_address, pfn);
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out_unlock:
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mutex_unlock(&dev->struct_mutex);
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out:
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switch (ret) {
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case -EAGAIN:
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case 0:
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case -ERESTARTSYS:
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case -EINTR:
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case -EBUSY:
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/*
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* EBUSY is ok: this just means that another thread
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* already did the job.
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*/
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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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/** get mmap offset */
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static uint64_t 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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WARN_ON(!mutex_is_locked(&dev->struct_mutex));
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/* Make it mmapable */
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ret = drm_gem_create_mmap_offset(obj);
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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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uint64_t msm_gem_mmap_offset(struct drm_gem_object *obj)
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{
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uint64_t offset;
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mutex_lock(&obj->dev->struct_mutex);
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offset = mmap_offset(obj);
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mutex_unlock(&obj->dev->struct_mutex);
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return offset;
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}
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/* should be called under struct_mutex.. although it can be called
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* from atomic context without struct_mutex to acquire an extra
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* iova ref if you know one is already held.
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*
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* That means when I do eventually need to add support for unpinning
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* the refcnt counter needs to be atomic_t.
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*/
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int msm_gem_get_iova_locked(struct drm_gem_object *obj, int id,
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uint32_t *iova)
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{
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struct msm_gem_object *msm_obj = to_msm_bo(obj);
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int ret = 0;
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if (!msm_obj->domain[id].iova) {
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struct msm_drm_private *priv = obj->dev->dev_private;
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struct msm_mmu *mmu = priv->mmus[id];
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struct page **pages = get_pages(obj);
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if (IS_ERR(pages))
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return PTR_ERR(pages);
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if (iommu_present(&platform_bus_type)) {
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uint32_t offset = (uint32_t)mmap_offset(obj);
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ret = mmu->funcs->map(mmu, offset, msm_obj->sgt,
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obj->size, IOMMU_READ | IOMMU_WRITE);
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msm_obj->domain[id].iova = offset;
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} else {
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msm_obj->domain[id].iova = physaddr(obj);
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}
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}
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if (!ret)
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*iova = msm_obj->domain[id].iova;
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return ret;
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}
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int msm_gem_get_iova(struct drm_gem_object *obj, int id, uint32_t *iova)
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{
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struct msm_gem_object *msm_obj = to_msm_bo(obj);
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int ret;
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/* this is safe right now because we don't unmap until the
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* bo is deleted:
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*/
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if (msm_obj->domain[id].iova) {
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*iova = msm_obj->domain[id].iova;
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return 0;
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}
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mutex_lock(&obj->dev->struct_mutex);
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ret = msm_gem_get_iova_locked(obj, id, iova);
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mutex_unlock(&obj->dev->struct_mutex);
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return ret;
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}
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void msm_gem_put_iova(struct drm_gem_object *obj, int id)
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{
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// XXX TODO ..
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// NOTE: probably don't need a _locked() version.. we wouldn't
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// normally unmap here, but instead just mark that it could be
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// unmapped (if the iova refcnt drops to zero), but then later
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// if another _get_iova_locked() fails we can start unmapping
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// things that are no longer needed..
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}
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int msm_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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args->pitch = align_pitch(args->width, args->bpp);
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args->size = PAGE_ALIGN(args->pitch * args->height);
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return msm_gem_new_handle(dev, file, args->size,
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MSM_BO_SCANOUT | MSM_BO_WC, &args->handle);
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}
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int msm_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 drm_gem_object *obj;
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int ret = 0;
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/* GEM does all our handle to object mapping */
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obj = drm_gem_object_lookup(dev, file, handle);
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if (obj == NULL) {
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ret = -ENOENT;
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goto fail;
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}
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*offset = msm_gem_mmap_offset(obj);
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drm_gem_object_unreference_unlocked(obj);
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fail:
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return ret;
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}
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void *msm_gem_vaddr_locked(struct drm_gem_object *obj)
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{
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struct msm_gem_object *msm_obj = to_msm_bo(obj);
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WARN_ON(!mutex_is_locked(&obj->dev->struct_mutex));
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if (!msm_obj->vaddr) {
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struct page **pages = get_pages(obj);
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if (IS_ERR(pages))
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return ERR_CAST(pages);
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msm_obj->vaddr = vmap(pages, obj->size >> PAGE_SHIFT,
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VM_MAP, pgprot_writecombine(PAGE_KERNEL));
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}
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return msm_obj->vaddr;
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}
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void *msm_gem_vaddr(struct drm_gem_object *obj)
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{
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void *ret;
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mutex_lock(&obj->dev->struct_mutex);
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ret = msm_gem_vaddr_locked(obj);
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mutex_unlock(&obj->dev->struct_mutex);
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return ret;
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}
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/* setup callback for when bo is no longer busy..
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* TODO probably want to differentiate read vs write..
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*/
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int msm_gem_queue_inactive_cb(struct drm_gem_object *obj,
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struct msm_fence_cb *cb)
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{
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struct drm_device *dev = obj->dev;
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struct msm_drm_private *priv = dev->dev_private;
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struct msm_gem_object *msm_obj = to_msm_bo(obj);
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int ret = 0;
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mutex_lock(&dev->struct_mutex);
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if (!list_empty(&cb->work.entry)) {
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ret = -EINVAL;
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} else if (is_active(msm_obj)) {
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cb->fence = max(msm_obj->read_fence, msm_obj->write_fence);
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list_add_tail(&cb->work.entry, &priv->fence_cbs);
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} else {
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queue_work(priv->wq, &cb->work);
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}
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mutex_unlock(&dev->struct_mutex);
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return ret;
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}
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void msm_gem_move_to_active(struct drm_gem_object *obj,
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struct msm_gpu *gpu, bool write, uint32_t fence)
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{
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struct msm_gem_object *msm_obj = to_msm_bo(obj);
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msm_obj->gpu = gpu;
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if (write)
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msm_obj->write_fence = fence;
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else
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msm_obj->read_fence = fence;
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list_del_init(&msm_obj->mm_list);
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list_add_tail(&msm_obj->mm_list, &gpu->active_list);
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}
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void msm_gem_move_to_inactive(struct drm_gem_object *obj)
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{
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struct drm_device *dev = obj->dev;
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struct msm_drm_private *priv = dev->dev_private;
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struct msm_gem_object *msm_obj = to_msm_bo(obj);
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WARN_ON(!mutex_is_locked(&dev->struct_mutex));
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msm_obj->gpu = NULL;
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msm_obj->read_fence = 0;
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msm_obj->write_fence = 0;
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list_del_init(&msm_obj->mm_list);
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list_add_tail(&msm_obj->mm_list, &priv->inactive_list);
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}
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int msm_gem_cpu_prep(struct drm_gem_object *obj, uint32_t op,
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struct timespec *timeout)
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{
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struct drm_device *dev = obj->dev;
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struct msm_gem_object *msm_obj = to_msm_bo(obj);
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int ret = 0;
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if (is_active(msm_obj)) {
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uint32_t fence = 0;
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if (op & MSM_PREP_READ)
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fence = msm_obj->write_fence;
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if (op & MSM_PREP_WRITE)
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fence = max(fence, msm_obj->read_fence);
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if (op & MSM_PREP_NOSYNC)
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timeout = NULL;
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ret = msm_wait_fence_interruptable(dev, fence, timeout);
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}
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/* TODO cache maintenance */
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return ret;
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}
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int msm_gem_cpu_fini(struct drm_gem_object *obj)
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{
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/* TODO cache maintenance */
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return 0;
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}
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#ifdef CONFIG_DEBUG_FS
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void msm_gem_describe(struct drm_gem_object *obj, struct seq_file *m)
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{
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struct drm_device *dev = obj->dev;
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struct msm_gem_object *msm_obj = to_msm_bo(obj);
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uint64_t off = drm_vma_node_start(&obj->vma_node);
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WARN_ON(!mutex_is_locked(&dev->struct_mutex));
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seq_printf(m, "%08x: %c(r=%u,w=%u) %2d (%2d) %08llx %p %d\n",
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msm_obj->flags, is_active(msm_obj) ? 'A' : 'I',
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msm_obj->read_fence, msm_obj->write_fence,
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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_unlocked(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);
|
|
}
|