Hi Rob, Yes, I’d completely missed the shrinker path in this cleanup. But, yeah, I see how get_pages (which is called with msm_obj->lock held) -> drm_gem_get_pages could trigger shrinker_scan which calls msm_gem_purge. It makes sense to prevent any get_pages/vmap on objects that’ve been marked as DONTNEED. I’ll send you a patch soon for that.
Thanks, Sushmita > On Jun 14, 2017, at 10:49 AM, Rob Clark <robdcl...@gmail.com> wrote: > > On Tue, Jun 13, 2017 at 6:52 PM, Sushmita Susheelendra > <ssush...@codeaurora.org <mailto:ssush...@codeaurora.org>> wrote: >> Buffer object specific resources like pages, domains, sg list >> need not be protected with struct_mutex. They can be protected >> with a buffer object level lock. This simplifies locking and >> makes it easier to avoid potential recursive locking scenarios >> for SVM involving mmap_sem and struct_mutex. This also removes >> unnecessary serialization when creating buffer objects, and also >> between buffer object creation and GPU command submission. > > I've rebased this on top of the other changes that are in the queue for 4.13: > > https://github.com/freedreno/kernel-msm/commit/4e0c4e139a647914cfcf7c413da5c19f9f124885 > > <https://github.com/freedreno/kernel-msm/commit/4e0c4e139a647914cfcf7c413da5c19f9f124885> > > I've done some light testing on a5xx.. although between this and > moving gpu->hw_init() under struct_mutex, I need to double check on > a3xx/a4xx. > > I do think we probably need a bit more work for shrinker. In > particular msm_gem_purge() still assumes everything is protected by a > single struct_mutex, which is no longer true. The tricky thing here > is that shrinker can be triggered by code-paths where we already hold > msm_obj->lock. > > I think we probably want anything that ends up in get_pages() or > vmap() to have something along the lines of > > if (WARN_ON(msm_obj->madv == DONTNEED)) { > mutex_unlock(&msm_obj->lock); > return -EINVAL; // or -EBUSY, or ?? > } > > it's really only something that a badly behaved userspace could > triger.. but otoh we probably don't want to let a badly behaved > userspace deadlock things in the kernel. I guess I probably should > have written some test cases for this by now. > >> Change-Id: I4fba9f8c38a6cd13f80f660639d1e74d4336e3fb > > jfyi, no need for the Change-Id.. I usually strip them out when I > apply patches, but I appreciate if you can strip them out before > sending (because sometimes I forget) > > BR, > -R > >> Signed-off-by: Sushmita Susheelendra <ssush...@codeaurora.org> >> --- >> drivers/gpu/drm/msm/adreno/a5xx_gpu.c | 2 - >> drivers/gpu/drm/msm/adreno/a5xx_power.c | 2 - >> drivers/gpu/drm/msm/adreno/adreno_gpu.c | 2 - >> drivers/gpu/drm/msm/dsi/dsi_host.c | 5 +- >> drivers/gpu/drm/msm/mdp/mdp4/mdp4_crtc.c | 2 +- >> drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.c | 2 - >> drivers/gpu/drm/msm/msm_drv.c | 1 + >> drivers/gpu/drm/msm/msm_drv.h | 7 +- >> drivers/gpu/drm/msm/msm_fbdev.c | 6 +- >> drivers/gpu/drm/msm/msm_gem.c | 190 >> +++++++++++++++---------------- >> drivers/gpu/drm/msm/msm_gem.h | 2 + >> drivers/gpu/drm/msm/msm_gem_submit.c | 6 +- >> drivers/gpu/drm/msm/msm_gem_vma.c | 10 +- >> drivers/gpu/drm/msm/msm_gpu.c | 4 +- >> drivers/gpu/drm/msm/msm_rd.c | 4 +- >> drivers/gpu/drm/msm/msm_ringbuffer.c | 2 +- >> 16 files changed, 120 insertions(+), 127 deletions(-) >> >> diff --git a/drivers/gpu/drm/msm/adreno/a5xx_gpu.c >> b/drivers/gpu/drm/msm/adreno/a5xx_gpu.c >> index 31a9bce..7893de1 100644 >> --- a/drivers/gpu/drm/msm/adreno/a5xx_gpu.c >> +++ b/drivers/gpu/drm/msm/adreno/a5xx_gpu.c >> @@ -235,9 +235,7 @@ static struct drm_gem_object *a5xx_ucode_load_bo(struct >> msm_gpu *gpu, >> struct drm_gem_object *bo; >> void *ptr; >> >> - mutex_lock(&drm->struct_mutex); >> bo = msm_gem_new(drm, fw->size - 4, MSM_BO_UNCACHED); >> - mutex_unlock(&drm->struct_mutex); >> >> if (IS_ERR(bo)) >> return bo; >> diff --git a/drivers/gpu/drm/msm/adreno/a5xx_power.c >> b/drivers/gpu/drm/msm/adreno/a5xx_power.c >> index 72d52c7..eb88f44 100644 >> --- a/drivers/gpu/drm/msm/adreno/a5xx_power.c >> +++ b/drivers/gpu/drm/msm/adreno/a5xx_power.c >> @@ -294,9 +294,7 @@ void a5xx_gpmu_ucode_init(struct msm_gpu *gpu) >> */ >> bosize = (cmds_size + (cmds_size / TYPE4_MAX_PAYLOAD) + 1) << 2; >> >> - mutex_lock(&drm->struct_mutex); >> a5xx_gpu->gpmu_bo = msm_gem_new(drm, bosize, MSM_BO_UNCACHED); >> - mutex_unlock(&drm->struct_mutex); >> >> if (IS_ERR(a5xx_gpu->gpmu_bo)) >> goto err; >> diff --git a/drivers/gpu/drm/msm/adreno/adreno_gpu.c >> b/drivers/gpu/drm/msm/adreno/adreno_gpu.c >> index 5b63fc6..1162c15 100644 >> --- a/drivers/gpu/drm/msm/adreno/adreno_gpu.c >> +++ b/drivers/gpu/drm/msm/adreno/adreno_gpu.c >> @@ -392,10 +392,8 @@ int adreno_gpu_init(struct drm_device *drm, struct >> platform_device *pdev, >> return ret; >> } >> >> - mutex_lock(&drm->struct_mutex); >> adreno_gpu->memptrs_bo = msm_gem_new(drm, >> sizeof(*adreno_gpu->memptrs), >> MSM_BO_UNCACHED); >> - mutex_unlock(&drm->struct_mutex); >> if (IS_ERR(adreno_gpu->memptrs_bo)) { >> ret = PTR_ERR(adreno_gpu->memptrs_bo); >> adreno_gpu->memptrs_bo = NULL; >> diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c >> b/drivers/gpu/drm/msm/dsi/dsi_host.c >> index 4f79b10..6a1b0da 100644 >> --- a/drivers/gpu/drm/msm/dsi/dsi_host.c >> +++ b/drivers/gpu/drm/msm/dsi/dsi_host.c >> @@ -980,19 +980,16 @@ static int dsi_tx_buf_alloc(struct msm_dsi_host >> *msm_host, int size) >> uint64_t iova; >> >> if (cfg_hnd->major == MSM_DSI_VER_MAJOR_6G) { >> - mutex_lock(&dev->struct_mutex); >> msm_host->tx_gem_obj = msm_gem_new(dev, size, >> MSM_BO_UNCACHED); >> if (IS_ERR(msm_host->tx_gem_obj)) { >> ret = PTR_ERR(msm_host->tx_gem_obj); >> pr_err("%s: failed to allocate gem, %d\n", >> __func__, ret); >> msm_host->tx_gem_obj = NULL; >> - mutex_unlock(&dev->struct_mutex); >> return ret; >> } >> >> - ret = msm_gem_get_iova_locked(msm_host->tx_gem_obj, 0, >> &iova); >> - mutex_unlock(&dev->struct_mutex); >> + ret = msm_gem_get_iova(msm_host->tx_gem_obj, 0, &iova); >> if (ret) { >> pr_err("%s: failed to get iova, %d\n", __func__, ret); >> return ret; >> diff --git a/drivers/gpu/drm/msm/mdp/mdp4/mdp4_crtc.c >> b/drivers/gpu/drm/msm/mdp/mdp4/mdp4_crtc.c >> index f29194a..15478f8 100644 >> --- a/drivers/gpu/drm/msm/mdp/mdp4/mdp4_crtc.c >> +++ b/drivers/gpu/drm/msm/mdp/mdp4/mdp4_crtc.c >> @@ -372,7 +372,7 @@ static void update_cursor(struct drm_crtc *crtc) >> if (next_bo) { >> /* take a obj ref + iova ref when we start scanning >> out: */ >> drm_gem_object_reference(next_bo); >> - msm_gem_get_iova_locked(next_bo, mdp4_kms->id, >> &iova); >> + msm_gem_get_iova(next_bo, mdp4_kms->id, &iova); >> >> /* enable cursor: */ >> mdp4_write(mdp4_kms, REG_MDP4_DMA_CURSOR_SIZE(dma), >> diff --git a/drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.c >> b/drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.c >> index 6295204..3a464b3 100644 >> --- a/drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.c >> +++ b/drivers/gpu/drm/msm/mdp/mdp4/mdp4_kms.c >> @@ -561,9 +561,7 @@ struct msm_kms *mdp4_kms_init(struct drm_device *dev) >> goto fail; >> } >> >> - mutex_lock(&dev->struct_mutex); >> mdp4_kms->blank_cursor_bo = msm_gem_new(dev, SZ_16K, MSM_BO_WC); >> - mutex_unlock(&dev->struct_mutex); >> if (IS_ERR(mdp4_kms->blank_cursor_bo)) { >> ret = PTR_ERR(mdp4_kms->blank_cursor_bo); >> dev_err(dev->dev, "could not allocate blank-cursor bo: %d\n", >> ret); >> diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c >> index 87b5695..bb1f3ee 100644 >> --- a/drivers/gpu/drm/msm/msm_drv.c >> +++ b/drivers/gpu/drm/msm/msm_drv.c >> @@ -349,6 +349,7 @@ static int msm_init_vram(struct drm_device *dev) >> priv->vram.size = size; >> >> drm_mm_init(&priv->vram.mm, 0, (size >> PAGE_SHIFT) - 1); >> + spin_lock_init(&priv->vram.lock); >> >> attrs |= DMA_ATTR_NO_KERNEL_MAPPING; >> attrs |= DMA_ATTR_WRITE_COMBINE; >> diff --git a/drivers/gpu/drm/msm/msm_drv.h b/drivers/gpu/drm/msm/msm_drv.h >> index 28b6f9b..567737d 100644 >> --- a/drivers/gpu/drm/msm/msm_drv.h >> +++ b/drivers/gpu/drm/msm/msm_drv.h >> @@ -157,6 +157,7 @@ struct msm_drm_private { >> * and position mm_node->start is in # of pages: >> */ >> struct drm_mm mm; >> + spinlock_t lock; /* Protects drm_mm node allocation/removal >> */ >> } vram; >> >> struct notifier_block vmap_notifier; >> @@ -209,8 +210,6 @@ int msm_gem_mmap_obj(struct drm_gem_object *obj, >> int msm_gem_mmap(struct file *filp, struct vm_area_struct *vma); >> int msm_gem_fault(struct vm_fault *vmf); >> uint64_t msm_gem_mmap_offset(struct drm_gem_object *obj); >> -int msm_gem_get_iova_locked(struct drm_gem_object *obj, int id, >> - uint64_t *iova); >> int msm_gem_get_iova(struct drm_gem_object *obj, int id, uint64_t *iova); >> uint64_t msm_gem_iova(struct drm_gem_object *obj, int id); >> struct page **msm_gem_get_pages(struct drm_gem_object *obj); >> @@ -228,9 +227,7 @@ struct drm_gem_object >> *msm_gem_prime_import_sg_table(struct drm_device *dev, >> struct dma_buf_attachment *attach, struct sg_table *sg); >> int msm_gem_prime_pin(struct drm_gem_object *obj); >> void msm_gem_prime_unpin(struct drm_gem_object *obj); >> -void *msm_gem_get_vaddr_locked(struct drm_gem_object *obj); >> void *msm_gem_get_vaddr(struct drm_gem_object *obj); >> -void msm_gem_put_vaddr_locked(struct drm_gem_object *obj); >> void msm_gem_put_vaddr(struct drm_gem_object *obj); >> int msm_gem_madvise(struct drm_gem_object *obj, unsigned madv); >> void msm_gem_purge(struct drm_gem_object *obj); >> @@ -247,6 +244,8 @@ 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 *msm_gem_new(struct drm_device *dev, >> uint32_t size, uint32_t flags); >> +struct drm_gem_object *msm_gem_new_locked(struct drm_device *dev, >> + uint32_t size, uint32_t flags); >> struct drm_gem_object *msm_gem_import(struct drm_device *dev, >> struct dma_buf *dmabuf, struct sg_table *sgt); >> >> diff --git a/drivers/gpu/drm/msm/msm_fbdev.c >> b/drivers/gpu/drm/msm/msm_fbdev.c >> index 951e40f..785925e9 100644 >> --- a/drivers/gpu/drm/msm/msm_fbdev.c >> +++ b/drivers/gpu/drm/msm/msm_fbdev.c >> @@ -95,10 +95,8 @@ static int msm_fbdev_create(struct drm_fb_helper *helper, >> /* allocate backing bo */ >> size = mode_cmd.pitches[0] * mode_cmd.height; >> DBG("allocating %d bytes for fb %d", size, dev->primary->index); >> - mutex_lock(&dev->struct_mutex); >> fbdev->bo = msm_gem_new(dev, size, MSM_BO_SCANOUT | >> MSM_BO_WC | MSM_BO_STOLEN); >> - mutex_unlock(&dev->struct_mutex); >> if (IS_ERR(fbdev->bo)) { >> ret = PTR_ERR(fbdev->bo); >> fbdev->bo = NULL; >> @@ -124,7 +122,7 @@ static int msm_fbdev_create(struct drm_fb_helper *helper, >> * in panic (ie. lock-safe, etc) we could avoid pinning the >> * buffer now: >> */ >> - ret = msm_gem_get_iova_locked(fbdev->bo, 0, &paddr); >> + ret = msm_gem_get_iova(fbdev->bo, 0, &paddr); >> if (ret) { >> dev_err(dev->dev, "failed to get buffer obj iova: %d\n", ret); >> goto fail_unlock; >> @@ -153,7 +151,7 @@ static int msm_fbdev_create(struct drm_fb_helper *helper, >> >> dev->mode_config.fb_base = paddr; >> >> - fbi->screen_base = msm_gem_get_vaddr_locked(fbdev->bo); >> + fbi->screen_base = msm_gem_get_vaddr(fbdev->bo); >> if (IS_ERR(fbi->screen_base)) { >> ret = PTR_ERR(fbi->screen_base); >> goto fail_unlock; >> diff --git a/drivers/gpu/drm/msm/msm_gem.c b/drivers/gpu/drm/msm/msm_gem.c >> index 68e509b..1e803fb 100644 >> --- a/drivers/gpu/drm/msm/msm_gem.c >> +++ b/drivers/gpu/drm/msm/msm_gem.c >> @@ -41,8 +41,7 @@ static bool use_pages(struct drm_gem_object *obj) >> } >> >> /* allocate pages from VRAM carveout, used when no IOMMU: */ >> -static struct page **get_pages_vram(struct drm_gem_object *obj, >> - int npages) >> +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; >> @@ -54,7 +53,9 @@ static struct page **get_pages_vram(struct drm_gem_object >> *obj, >> if (!p) >> return ERR_PTR(-ENOMEM); >> >> + spin_lock(&priv->vram.lock); >> ret = drm_mm_insert_node(&priv->vram.mm, msm_obj->vram_node, npages); >> + spin_unlock(&priv->vram.lock); >> if (ret) { >> drm_free_large(p); >> return ERR_PTR(ret); >> @@ -69,7 +70,6 @@ static struct page **get_pages_vram(struct drm_gem_object >> *obj, >> 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); >> @@ -109,6 +109,18 @@ static struct page **get_pages(struct drm_gem_object >> *obj) >> return msm_obj->pages; >> } >> >> +static void put_pages_vram(struct drm_gem_object *obj) >> +{ >> + struct msm_gem_object *msm_obj = to_msm_bo(obj); >> + struct msm_drm_private *priv = obj->dev->dev_private; >> + >> + spin_lock(&priv->vram.lock); >> + drm_mm_remove_node(msm_obj->vram_node); >> + spin_unlock(&priv->vram.lock); >> + >> + drm_free_large(msm_obj->pages); >> +} >> + >> static void put_pages(struct drm_gem_object *obj) >> { >> struct msm_gem_object *msm_obj = to_msm_bo(obj); >> @@ -125,10 +137,8 @@ static void put_pages(struct drm_gem_object *obj) >> >> if (use_pages(obj)) >> 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); >> - } >> + else >> + put_pages_vram(obj); >> >> msm_obj->pages = NULL; >> } >> @@ -136,11 +146,12 @@ static void put_pages(struct drm_gem_object *obj) >> >> struct page **msm_gem_get_pages(struct drm_gem_object *obj) >> { >> - struct drm_device *dev = obj->dev; >> + struct msm_gem_object *msm_obj = to_msm_bo(obj); >> struct page **p; >> - mutex_lock(&dev->struct_mutex); >> + >> + mutex_lock(&msm_obj->lock); >> p = get_pages(obj); >> - mutex_unlock(&dev->struct_mutex); >> + mutex_unlock(&msm_obj->lock); >> return p; >> } >> >> @@ -195,25 +206,17 @@ int msm_gem_fault(struct vm_fault *vmf) >> { >> struct vm_area_struct *vma = vmf->vma; >> struct drm_gem_object *obj = vma->vm_private_data; >> - struct drm_device *dev = obj->dev; >> - struct msm_drm_private *priv = dev->dev_private; >> + struct msm_gem_object *msm_obj = to_msm_bo(obj); >> struct page **pages; >> unsigned long pfn; >> pgoff_t pgoff; >> int ret; >> >> - /* This should only happen if userspace tries to pass a mmap'd >> - * but unfaulted gem bo vaddr into submit ioctl, triggering >> - * a page fault while struct_mutex is already held. This is >> - * not a valid use-case so just bail. >> + /* >> + * vm_ops.open/drm_gem_mmap_obj and close get and put >> + * a reference on obj. So, we dont need to hold one here. >> */ >> - if (priv->struct_mutex_task == current) >> - return VM_FAULT_SIGBUS; >> - >> - /* 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); >> + ret = mutex_lock_interruptible(&msm_obj->lock); >> if (ret) >> goto out; >> >> @@ -235,7 +238,7 @@ int msm_gem_fault(struct vm_fault *vmf) >> ret = vm_insert_mixed(vma, vmf->address, __pfn_to_pfn_t(pfn, >> PFN_DEV)); >> >> out_unlock: >> - mutex_unlock(&dev->struct_mutex); >> + mutex_unlock(&msm_obj->lock); >> out: >> switch (ret) { >> case -EAGAIN: >> @@ -259,9 +262,10 @@ int msm_gem_fault(struct vm_fault *vmf) >> static uint64_t mmap_offset(struct drm_gem_object *obj) >> { >> struct drm_device *dev = obj->dev; >> + struct msm_gem_object *msm_obj = to_msm_bo(obj); >> int ret; >> >> - WARN_ON(!mutex_is_locked(&dev->struct_mutex)); >> + WARN_ON(!mutex_is_locked(&msm_obj->lock)); >> >> /* Make it mmapable */ >> ret = drm_gem_create_mmap_offset(obj); >> @@ -277,21 +281,23 @@ static uint64_t mmap_offset(struct drm_gem_object *obj) >> uint64_t msm_gem_mmap_offset(struct drm_gem_object *obj) >> { >> uint64_t offset; >> - mutex_lock(&obj->dev->struct_mutex); >> + struct msm_gem_object *msm_obj = to_msm_bo(obj); >> + >> + mutex_lock(&msm_obj->lock); >> offset = mmap_offset(obj); >> - mutex_unlock(&obj->dev->struct_mutex); >> + mutex_unlock(&msm_obj->lock); >> return offset; >> } >> >> +/* Called with msm_obj->lock locked */ >> static void >> put_iova(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)); >> + WARN_ON(!mutex_is_locked(&msm_obj->lock)); >> >> for (id = 0; id < ARRAY_SIZE(msm_obj->domain); id++) { >> if (!priv->aspace[id]) >> @@ -301,25 +307,23 @@ uint64_t msm_gem_mmap_offset(struct drm_gem_object >> *obj) >> } >> } >> >> -/* 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, >> +/* A reference to obj must be held before calling this function. */ >> +int msm_gem_get_iova(struct drm_gem_object *obj, int id, >> uint64_t *iova) >> { >> struct msm_gem_object *msm_obj = to_msm_bo(obj); >> int ret = 0; >> >> + mutex_lock(&msm_obj->lock); >> + >> 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)) >> + if (IS_ERR(pages)) { >> + mutex_unlock(&msm_obj->lock); >> return PTR_ERR(pages); >> + } >> >> if (iommu_present(&platform_bus_type)) { >> ret = msm_gem_map_vma(priv->aspace[id], >> &msm_obj->domain[id], >> @@ -332,26 +336,7 @@ int msm_gem_get_iova_locked(struct drm_gem_object *obj, >> int id, >> if (!ret) >> *iova = msm_obj->domain[id].iova; >> >> - return ret; >> -} >> - >> -/* get iova, taking a reference. Should have a matching put */ >> -int msm_gem_get_iova(struct drm_gem_object *obj, int id, uint64_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); >> + mutex_unlock(&msm_obj->lock); >> return ret; >> } >> >> @@ -405,45 +390,37 @@ int msm_gem_dumb_map_offset(struct drm_file *file, >> struct drm_device *dev, >> return ret; >> } >> >> -void *msm_gem_get_vaddr_locked(struct drm_gem_object *obj) >> +void *msm_gem_get_vaddr(struct drm_gem_object *obj) >> { >> struct msm_gem_object *msm_obj = to_msm_bo(obj); >> - WARN_ON(!mutex_is_locked(&obj->dev->struct_mutex)); >> + >> + mutex_lock(&msm_obj->lock); >> if (!msm_obj->vaddr) { >> struct page **pages = get_pages(obj); >> - if (IS_ERR(pages)) >> + if (IS_ERR(pages)) { >> + mutex_unlock(&msm_obj->lock); >> return ERR_CAST(pages); >> + } >> msm_obj->vaddr = vmap(pages, obj->size >> PAGE_SHIFT, >> VM_MAP, pgprot_writecombine(PAGE_KERNEL)); >> - if (msm_obj->vaddr == NULL) >> + if (msm_obj->vaddr == NULL) { >> + mutex_unlock(&msm_obj->lock); >> return ERR_PTR(-ENOMEM); >> + } >> } >> msm_obj->vmap_count++; >> + mutex_unlock(&msm_obj->lock); >> return msm_obj->vaddr; >> } >> >> -void *msm_gem_get_vaddr(struct drm_gem_object *obj) >> -{ >> - void *ret; >> - mutex_lock(&obj->dev->struct_mutex); >> - ret = msm_gem_get_vaddr_locked(obj); >> - mutex_unlock(&obj->dev->struct_mutex); >> - return ret; >> -} >> - >> -void msm_gem_put_vaddr_locked(struct drm_gem_object *obj) >> +void msm_gem_put_vaddr(struct drm_gem_object *obj) >> { >> struct msm_gem_object *msm_obj = to_msm_bo(obj); >> - WARN_ON(!mutex_is_locked(&obj->dev->struct_mutex)); >> + >> + mutex_lock(&msm_obj->lock); >> WARN_ON(msm_obj->vmap_count < 1); >> msm_obj->vmap_count--; >> -} >> - >> -void msm_gem_put_vaddr(struct drm_gem_object *obj) >> -{ >> - mutex_lock(&obj->dev->struct_mutex); >> - msm_gem_put_vaddr_locked(obj); >> - mutex_unlock(&obj->dev->struct_mutex); >> + mutex_unlock(&msm_obj->lock); >> } >> >> /* Update madvise status, returns true if not purged, else >> @@ -697,6 +674,8 @@ void msm_gem_free_object(struct drm_gem_object *obj) >> >> list_del(&msm_obj->mm_list); >> >> + mutex_lock(&msm_obj->lock); >> + >> put_iova(obj); >> >> if (obj->import_attach) { >> @@ -720,6 +699,7 @@ void msm_gem_free_object(struct drm_gem_object *obj) >> >> drm_gem_object_release(obj); >> >> + mutex_unlock(&msm_obj->lock); >> kfree(msm_obj); >> } >> >> @@ -730,14 +710,8 @@ int msm_gem_new_handle(struct drm_device *dev, struct >> drm_file *file, >> 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); >> >> @@ -752,7 +726,8 @@ int msm_gem_new_handle(struct drm_device *dev, struct >> drm_file *file, >> static int msm_gem_new_impl(struct drm_device *dev, >> uint32_t size, uint32_t flags, >> struct reservation_object *resv, >> - struct drm_gem_object **obj) >> + struct drm_gem_object **obj, >> + bool struct_mutex_locked) >> { >> struct msm_drm_private *priv = dev->dev_private; >> struct msm_gem_object *msm_obj; >> @@ -781,6 +756,8 @@ static int msm_gem_new_impl(struct drm_device *dev, >> if (!msm_obj) >> return -ENOMEM; >> >> + mutex_init(&msm_obj->lock); >> + >> if (use_vram) >> msm_obj->vram_node = &msm_obj->domain[0].node; >> >> @@ -795,21 +772,25 @@ static int msm_gem_new_impl(struct drm_device *dev, >> } >> >> INIT_LIST_HEAD(&msm_obj->submit_entry); >> - list_add_tail(&msm_obj->mm_list, &priv->inactive_list); >> + if (struct_mutex_locked) { >> + list_add_tail(&msm_obj->mm_list, &priv->inactive_list); >> + } else { >> + mutex_lock(&dev->struct_mutex); >> + list_add_tail(&msm_obj->mm_list, &priv->inactive_list); >> + mutex_unlock(&dev->struct_mutex); >> + } >> >> *obj = &msm_obj->base; >> >> return 0; >> } >> >> -struct drm_gem_object *msm_gem_new(struct drm_device *dev, >> - uint32_t size, uint32_t flags) >> +static struct drm_gem_object *_msm_gem_new(struct drm_device *dev, >> + uint32_t size, uint32_t flags, bool struct_mutex_locked) >> { >> struct drm_gem_object *obj = NULL; >> int ret; >> >> - WARN_ON(!mutex_is_locked(&dev->struct_mutex)); >> - >> size = PAGE_ALIGN(size); >> >> /* Disallow zero sized objects as they make the underlying >> @@ -818,7 +799,7 @@ struct drm_gem_object *msm_gem_new(struct drm_device >> *dev, >> if (size == 0) >> return ERR_PTR(-EINVAL); >> >> - ret = msm_gem_new_impl(dev, size, flags, NULL, &obj); >> + ret = msm_gem_new_impl(dev, size, flags, NULL, &obj, >> struct_mutex_locked); >> if (ret) >> goto fail; >> >> @@ -833,10 +814,22 @@ struct drm_gem_object *msm_gem_new(struct drm_device >> *dev, >> return obj; >> >> fail: >> - drm_gem_object_unreference(obj); >> + drm_gem_object_unreference_unlocked(obj); >> return ERR_PTR(ret); >> } >> >> +struct drm_gem_object *msm_gem_new_locked(struct drm_device *dev, >> + uint32_t size, uint32_t flags) >> +{ >> + return _msm_gem_new(dev, size, flags, true); >> +} >> + >> +struct drm_gem_object *msm_gem_new(struct drm_device *dev, >> + uint32_t size, uint32_t flags) >> +{ >> + return _msm_gem_new(dev, size, flags, false); >> +} >> + >> struct drm_gem_object *msm_gem_import(struct drm_device *dev, >> struct dma_buf *dmabuf, struct sg_table *sgt) >> { >> @@ -853,7 +846,7 @@ struct drm_gem_object *msm_gem_import(struct drm_device >> *dev, >> >> size = PAGE_ALIGN(dmabuf->size); >> >> - ret = msm_gem_new_impl(dev, size, MSM_BO_WC, dmabuf->resv, &obj); >> + ret = msm_gem_new_impl(dev, size, MSM_BO_WC, dmabuf->resv, &obj, >> false); >> if (ret) >> goto fail; >> >> @@ -862,17 +855,22 @@ struct drm_gem_object *msm_gem_import(struct >> drm_device *dev, >> npages = size / PAGE_SIZE; >> >> msm_obj = to_msm_bo(obj); >> + mutex_lock(&msm_obj->lock); >> msm_obj->sgt = sgt; >> msm_obj->pages = drm_malloc_ab(npages, sizeof(struct page *)); >> if (!msm_obj->pages) { >> + mutex_unlock(&msm_obj->lock); >> ret = -ENOMEM; >> goto fail; >> } >> >> ret = drm_prime_sg_to_page_addr_arrays(sgt, msm_obj->pages, NULL, >> npages); >> - if (ret) >> + if (ret) { >> + mutex_unlock(&msm_obj->lock); >> goto fail; >> + } >> >> + mutex_unlock(&msm_obj->lock); >> return obj; >> >> fail: >> diff --git a/drivers/gpu/drm/msm/msm_gem.h b/drivers/gpu/drm/msm/msm_gem.h >> index 1b4cf20..b1bfc10 100644 >> --- a/drivers/gpu/drm/msm/msm_gem.h >> +++ b/drivers/gpu/drm/msm/msm_gem.h >> @@ -31,6 +31,7 @@ struct msm_gem_address_space { >> * and position mm_node->start is in # of pages: >> */ >> struct drm_mm mm; >> + spinlock_t lock; /* Protects drm_mm node allocation/removal */ >> struct msm_mmu *mmu; >> struct kref kref; >> }; >> @@ -87,6 +88,7 @@ struct msm_gem_object { >> * an IOMMU. Also used for stolen/splashscreen buffer. >> */ >> struct drm_mm_node *vram_node; >> + struct mutex lock; /* Protects resources associated with bo */ >> }; >> #define to_msm_bo(x) container_of(x, struct msm_gem_object, base) >> >> diff --git a/drivers/gpu/drm/msm/msm_gem_submit.c >> b/drivers/gpu/drm/msm/msm_gem_submit.c >> index 1c545eb..8420551 100644 >> --- a/drivers/gpu/drm/msm/msm_gem_submit.c >> +++ b/drivers/gpu/drm/msm/msm_gem_submit.c >> @@ -245,7 +245,7 @@ static int submit_pin_objects(struct msm_gem_submit >> *submit) >> uint64_t iova; >> >> /* if locking succeeded, pin bo: */ >> - ret = msm_gem_get_iova_locked(&msm_obj->base, >> + ret = msm_gem_get_iova(&msm_obj->base, >> submit->gpu->id, &iova); >> >> if (ret) >> @@ -301,7 +301,7 @@ static int submit_reloc(struct msm_gem_submit *submit, >> struct msm_gem_object *ob >> /* For now, just map the entire thing. Eventually we probably >> * to do it page-by-page, w/ kmap() if not vmap()d.. >> */ >> - ptr = msm_gem_get_vaddr_locked(&obj->base); >> + ptr = msm_gem_get_vaddr(&obj->base); >> >> if (IS_ERR(ptr)) { >> ret = PTR_ERR(ptr); >> @@ -359,7 +359,7 @@ static int submit_reloc(struct msm_gem_submit *submit, >> struct msm_gem_object *ob >> } >> >> out: >> - msm_gem_put_vaddr_locked(&obj->base); >> + msm_gem_put_vaddr(&obj->base); >> >> return ret; >> } >> diff --git a/drivers/gpu/drm/msm/msm_gem_vma.c >> b/drivers/gpu/drm/msm/msm_gem_vma.c >> index f285d7e..c36321bc 100644 >> --- a/drivers/gpu/drm/msm/msm_gem_vma.c >> +++ b/drivers/gpu/drm/msm/msm_gem_vma.c >> @@ -50,7 +50,9 @@ void msm_gem_address_space_put(struct >> msm_gem_address_space *aspace) >> aspace->mmu->funcs->unmap(aspace->mmu, vma->iova, sgt, size); >> } >> >> + spin_lock(&aspace->lock); >> drm_mm_remove_node(&vma->node); >> + spin_unlock(&aspace->lock); >> >> vma->iova = 0; >> >> @@ -63,10 +65,15 @@ void msm_gem_address_space_put(struct >> msm_gem_address_space *aspace) >> { >> int ret; >> >> - if (WARN_ON(drm_mm_node_allocated(&vma->node))) >> + spin_lock(&aspace->lock); >> + if (WARN_ON(drm_mm_node_allocated(&vma->node))) { >> + spin_unlock(&aspace->lock); >> return 0; >> + } >> >> ret = drm_mm_insert_node(&aspace->mm, &vma->node, npages); >> + spin_unlock(&aspace->lock); >> + >> if (ret) >> return ret; >> >> @@ -94,6 +101,7 @@ struct msm_gem_address_space * >> if (!aspace) >> return ERR_PTR(-ENOMEM); >> >> + spin_lock_init(&aspace->lock); >> aspace->name = name; >> aspace->mmu = msm_iommu_new(dev, domain); >> >> diff --git a/drivers/gpu/drm/msm/msm_gpu.c b/drivers/gpu/drm/msm/msm_gpu.c >> index 97b9c38..d6e5cb2 100644 >> --- a/drivers/gpu/drm/msm/msm_gpu.c >> +++ b/drivers/gpu/drm/msm/msm_gpu.c >> @@ -495,7 +495,7 @@ void msm_gpu_submit(struct msm_gpu *gpu, struct >> msm_gem_submit *submit, >> >> /* submit takes a reference to the bo and iova until retired: >> */ >> drm_gem_object_reference(&msm_obj->base); >> - msm_gem_get_iova_locked(&msm_obj->base, >> + msm_gem_get_iova(&msm_obj->base, >> submit->gpu->id, &iova); >> >> if (submit->bos[i].flags & MSM_SUBMIT_BO_WRITE) >> @@ -662,9 +662,7 @@ int msm_gpu_init(struct drm_device *drm, struct >> platform_device *pdev, >> >> >> /* Create ringbuffer: */ >> - mutex_lock(&drm->struct_mutex); >> gpu->rb = msm_ringbuffer_new(gpu, ringsz); >> - mutex_unlock(&drm->struct_mutex); >> if (IS_ERR(gpu->rb)) { >> ret = PTR_ERR(gpu->rb); >> gpu->rb = NULL; >> diff --git a/drivers/gpu/drm/msm/msm_rd.c b/drivers/gpu/drm/msm/msm_rd.c >> index 0e81faa..0366b80 100644 >> --- a/drivers/gpu/drm/msm/msm_rd.c >> +++ b/drivers/gpu/drm/msm/msm_rd.c >> @@ -268,7 +268,7 @@ static void snapshot_buf(struct msm_rd_state *rd, >> struct msm_gem_object *obj = submit->bos[idx].obj; >> const char *buf; >> >> - buf = msm_gem_get_vaddr_locked(&obj->base); >> + buf = msm_gem_get_vaddr(&obj->base); >> if (IS_ERR(buf)) >> return; >> >> @@ -283,7 +283,7 @@ static void snapshot_buf(struct msm_rd_state *rd, >> (uint32_t[3]){ iova, size, iova >> 32 }, 12); >> rd_write_section(rd, RD_BUFFER_CONTENTS, buf, size); >> >> - msm_gem_put_vaddr_locked(&obj->base); >> + msm_gem_put_vaddr(&obj->base); >> } >> >> /* called under struct_mutex */ >> diff --git a/drivers/gpu/drm/msm/msm_ringbuffer.c >> b/drivers/gpu/drm/msm/msm_ringbuffer.c >> index 67b34e0..791bca3 100644 >> --- a/drivers/gpu/drm/msm/msm_ringbuffer.c >> +++ b/drivers/gpu/drm/msm/msm_ringbuffer.c >> @@ -40,7 +40,7 @@ struct msm_ringbuffer *msm_ringbuffer_new(struct msm_gpu >> *gpu, int size) >> goto fail; >> } >> >> - ring->start = msm_gem_get_vaddr_locked(ring->bo); >> + ring->start = msm_gem_get_vaddr(ring->bo); >> if (IS_ERR(ring->start)) { >> ret = PTR_ERR(ring->start); >> goto fail; >> -- >> 1.9.1 >> >> -- >> To unsubscribe from this list: send the line "unsubscribe linux-arm-msm" in >> the body of a message to majord...@vger.kernel.org >> <mailto:majord...@vger.kernel.org> >> More majordomo info at http://vger.kernel.org/majordomo-info.html >> <http://vger.kernel.org/majordomo-info.html>
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