On Fri, 2011-11-18 at 08:57 +0100, Thomas Hellstrom wrote:
> Jerome,
>
> I don't like this change for the following reasons
-snip-
> >
> > One can take advantage of move notify callback but, there are
> > corner case where bind/unbind might be call without move notify
> > being call (in error path mostly). So to make sure that each
> > virtual address space have a consistent view of wether a buffer
> > object is backed or not by system page it's better to pass the
> > buffer object to bind/unbind.
As I discussed previously with Jerome on IRC, I believe the move_notify
hook is sufficient. I fixed a couple of issues back with it back when I
implemented support for this in nouveau.
Jerome did point out two issues however, which I believe can be solved
easily enough.
The first was that the error path after move_notify() has been called
doesn't reverse the move_notify() too, leaving incorrect page table
entries. This, I think, could easily be solved by swapping bo->mem and
mem, and re-calling move_notify() to have the driver reverse whatever it
did.
The second issue is that apparently move_notify() doesn't get called in
the destroy path. Nouveau's GEM layer takes care of this for our
userspace bos, and we don't use any kernel bos that are mapped into a
channel's address space so we don't hit it. This can probably be solved
easily enough too I expect.
Ben.
> >
> > Patch is straightforward, try to disturb the code as little as
> > possible.
> >
> > Signed-off-by: Jerome Glisse<jglisse@xxxxxxxxxx>
> > ---
> > drivers/gpu/drm/nouveau/nouveau_bo.c | 2 +-
> > drivers/gpu/drm/nouveau/nouveau_sgdma.c | 23 +++++++++++++++--------
> > drivers/gpu/drm/radeon/radeon_ttm.c | 8 +++++---
> > drivers/gpu/drm/ttm/ttm_agp_backend.c | 8 ++++----
> > drivers/gpu/drm/ttm/ttm_bo.c | 12 ++++++------
> > drivers/gpu/drm/ttm/ttm_bo_util.c | 12 ++++++------
> > drivers/gpu/drm/ttm/ttm_tt.c | 30 ++++++++++++++++--------------
> > drivers/gpu/drm/vmwgfx/vmwgfx_buffer.c | 6 ++++--
> > include/drm/ttm/ttm_bo_driver.h | 15 ++++++++-------
> > 9 files changed, 65 insertions(+), 51 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/nouveau/nouveau_bo.c b/drivers/gpu/drm/nouveau/nouveau_bo.c
> > index 857bca4..2c8474e 100644
> > --- a/drivers/gpu/drm/nouveau/nouveau_bo.c
> > +++ b/drivers/gpu/drm/nouveau/nouveau_bo.c
> > @@ -760,7 +760,7 @@ nouveau_bo_move_flipd(struct ttm_buffer_object *bo, bool evict, bool intr,
> > if (ret)
> > return ret;
> >
> > - ret = ttm_tt_bind(bo->ttm,&tmp_mem);
> > + ret = ttm_tt_bind(bo,&tmp_mem);
> > if (ret)
> > goto out;
> >
> > diff --git a/drivers/gpu/drm/nouveau/nouveau_sgdma.c b/drivers/gpu/drm/nouveau/nouveau_sgdma.c
> > index 47f245e..4ca0f79 100644
> > --- a/drivers/gpu/drm/nouveau/nouveau_sgdma.c
> > +++ b/drivers/gpu/drm/nouveau/nouveau_sgdma.c
> > @@ -29,8 +29,9 @@ nouveau_sgdma_destroy(struct ttm_tt *ttm)
> > }
> >
> > static int
> > -nv04_sgdma_bind(struct ttm_tt *ttm, struct ttm_mem_reg *mem)
> > +nv04_sgdma_bind(struct ttm_buffer_object *bo, struct ttm_mem_reg *mem)
> > {
> > + struct ttm_tt *ttm = bo->ttm;
> > struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)ttm;
> > struct drm_device *dev = nvbe->dev;
> > struct drm_nouveau_private *dev_priv = dev->dev_private;
> > @@ -55,8 +56,9 @@ nv04_sgdma_bind(struct ttm_tt *ttm, struct ttm_mem_reg *mem)
> > }
> >
> > static int
> > -nv04_sgdma_unbind(struct ttm_tt *ttm)
> > +nv04_sgdma_unbind(struct ttm_buffer_object *bo)
> > {
> > + struct ttm_tt *ttm = bo->ttm;
> > struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)ttm;
> > struct drm_device *dev = nvbe->dev;
> > struct drm_nouveau_private *dev_priv = dev->dev_private;
> > @@ -96,8 +98,9 @@ nv41_sgdma_flush(struct nouveau_sgdma_be *nvbe)
> > }
> >
> > static int
> > -nv41_sgdma_bind(struct ttm_tt *ttm, struct ttm_mem_reg *mem)
> > +nv41_sgdma_bind(struct ttm_buffer_object *bo, struct ttm_mem_reg *mem)
> > {
> > + struct ttm_tt *ttm = bo->ttm;
> > struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)ttm;
> > struct drm_nouveau_private *dev_priv = nvbe->dev->dev_private;
> > struct nouveau_gpuobj *pgt = dev_priv->gart_info.sg_ctxdma;
> > @@ -117,8 +120,9 @@ nv41_sgdma_bind(struct ttm_tt *ttm, struct ttm_mem_reg *mem)
> > }
> >
> > static int
> > -nv41_sgdma_unbind(struct ttm_tt *ttm)
> > +nv41_sgdma_unbind(struct ttm_buffer_object *bo)
> > {
> > + struct ttm_tt *ttm = bo->ttm;
> > struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)ttm;
> > struct drm_nouveau_private *dev_priv = nvbe->dev->dev_private;
> > struct nouveau_gpuobj *pgt = dev_priv->gart_info.sg_ctxdma;
> > @@ -205,8 +209,9 @@ nv44_sgdma_fill(struct nouveau_gpuobj *pgt, dma_addr_t *list, u32 base, u32 cnt)
> > }
> >
> > static int
> > -nv44_sgdma_bind(struct ttm_tt *ttm, struct ttm_mem_reg *mem)
> > +nv44_sgdma_bind(struct ttm_buffer_object *bo, struct ttm_mem_reg *mem)
> > {
> > + struct ttm_tt *ttm = bo->ttm;
> > struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)ttm;
> > struct drm_nouveau_private *dev_priv = nvbe->dev->dev_private;
> > struct nouveau_gpuobj *pgt = dev_priv->gart_info.sg_ctxdma;
> > @@ -245,8 +250,9 @@ nv44_sgdma_bind(struct ttm_tt *ttm, struct ttm_mem_reg *mem)
> > }
> >
> > static int
> > -nv44_sgdma_unbind(struct ttm_tt *ttm)
> > +nv44_sgdma_unbind(struct ttm_buffer_object *bo)
> > {
> > + struct ttm_tt *ttm = bo->ttm;
> > struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)ttm;
> > struct drm_nouveau_private *dev_priv = nvbe->dev->dev_private;
> > struct nouveau_gpuobj *pgt = dev_priv->gart_info.sg_ctxdma;
> > @@ -284,8 +290,9 @@ static struct ttm_backend_func nv44_sgdma_backend = {
> > };
> >
> > static int
> > -nv50_sgdma_bind(struct ttm_tt *ttm, struct ttm_mem_reg *mem)
> > +nv50_sgdma_bind(struct ttm_buffer_object *bo, struct ttm_mem_reg *mem)
> > {
> > + struct ttm_tt *ttm = bo->ttm;
> > struct nouveau_sgdma_be *nvbe = (struct nouveau_sgdma_be *)ttm;
> > struct nouveau_mem *node = mem->mm_node;
> >
> > @@ -295,7 +302,7 @@ nv50_sgdma_bind(struct ttm_tt *ttm, struct ttm_mem_reg *mem)
> > }
> >
> > static int
> > -nv50_sgdma_unbind(struct ttm_tt *ttm)
> > +nv50_sgdma_unbind(struct ttm_buffer_object *bo)
> > {
> > /* noop: unbound in move_notify() */
> > return 0;
> > diff --git a/drivers/gpu/drm/radeon/radeon_ttm.c b/drivers/gpu/drm/radeon/radeon_ttm.c
> > index b0ebaf8..584db4c 100644
> > --- a/drivers/gpu/drm/radeon/radeon_ttm.c
> > +++ b/drivers/gpu/drm/radeon/radeon_ttm.c
> > @@ -305,7 +305,7 @@ static int radeon_move_vram_ram(struct ttm_buffer_object *bo,
> > goto out_cleanup;
> > }
> >
> > - r = ttm_tt_bind(bo->ttm,&tmp_mem);
> > + r = ttm_tt_bind(bo,&tmp_mem);
> > if (unlikely(r)) {
> > goto out_cleanup;
> > }
> > @@ -506,9 +506,10 @@ struct radeon_ttm_tt {
> > u64 offset;
> > };
> >
> > -static int radeon_ttm_backend_bind(struct ttm_tt *ttm,
> > +static int radeon_ttm_backend_bind(struct ttm_buffer_object *bo,
> > struct ttm_mem_reg *bo_mem)
> > {
> > + struct ttm_tt *ttm = bo->ttm;
> > struct radeon_ttm_tt *gtt = (void*)ttm;
> > int r;
> >
> > @@ -527,8 +528,9 @@ static int radeon_ttm_backend_bind(struct ttm_tt *ttm,
> > return 0;
> > }
> >
> > -static int radeon_ttm_backend_unbind(struct ttm_tt *ttm)
> > +static int radeon_ttm_backend_unbind(struct ttm_buffer_object *bo)
> > {
> > + struct ttm_tt *ttm = bo->ttm;
> > struct radeon_ttm_tt *gtt = (void *)ttm;
> >
> > radeon_gart_unbind(gtt->rdev, gtt->offset, ttm->num_pages);
> > diff --git a/drivers/gpu/drm/ttm/ttm_agp_backend.c b/drivers/gpu/drm/ttm/ttm_agp_backend.c
> > index 14ebd36..a842530 100644
> > --- a/drivers/gpu/drm/ttm/ttm_agp_backend.c
> > +++ b/drivers/gpu/drm/ttm/ttm_agp_backend.c
> > @@ -45,8 +45,9 @@ struct ttm_agp_backend {
> > struct agp_bridge_data *bridge;
> > };
> >
> > -static int ttm_agp_bind(struct ttm_tt *ttm, struct ttm_mem_reg *bo_mem)
> > +static int ttm_agp_bind(struct ttm_buffer_object *bo, struct ttm_mem_reg *bo_mem)
> > {
> > + struct ttm_tt *ttm = bo->ttm;
> > struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm);
> > struct drm_mm_node *node = bo_mem->mm_node;
> > struct agp_memory *mem;
> > @@ -78,8 +79,9 @@ static int ttm_agp_bind(struct ttm_tt *ttm, struct ttm_mem_reg *bo_mem)
> > return ret;
> > }
> >
> > -static int ttm_agp_unbind(struct ttm_tt *ttm)
> > +static int ttm_agp_unbind(struct ttm_buffer_object *bo)
> > {
> > + struct ttm_tt *ttm = bo->ttm;
> > struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm);
> >
> > if (agp_be->mem) {
> > @@ -95,8 +97,6 @@ static void ttm_agp_destroy(struct ttm_tt *ttm)
> > {
> > struct ttm_agp_backend *agp_be = container_of(ttm, struct ttm_agp_backend, ttm);
> >
> > - if (agp_be->mem)
> > - ttm_agp_unbind(ttm);
> > kfree(agp_be);
> > }
> >
> > diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
> > index de7ad99..bffaf5d6 100644
> > --- a/drivers/gpu/drm/ttm/ttm_bo.c
> > +++ b/drivers/gpu/drm/ttm/ttm_bo.c
> > @@ -148,7 +148,7 @@ static void ttm_bo_release_list(struct kref *list_kref)
> > BUG_ON(!list_empty(&bo->ddestroy));
> >
> > if (bo->ttm)
> > - ttm_tt_destroy(bo->ttm);
> > + ttm_tt_destroy(bo);
> > atomic_dec(&bo->glob->bo_count);
> > if (bo->destroy)
> > bo->destroy(bo);
> > @@ -390,7 +390,7 @@ static int ttm_bo_handle_move_mem(struct ttm_buffer_object *bo,
> > goto out_err;
> >
> > if (mem->mem_type != TTM_PL_SYSTEM) {
> > - ret = ttm_tt_bind(bo->ttm, mem);
> > + ret = ttm_tt_bind(bo, mem);
> > if (ret)
> > goto out_err;
> > }
> > @@ -439,8 +439,8 @@ moved:
> > out_err:
> > new_man =&bdev->man[bo->mem.mem_type];
> > if ((new_man->flags& TTM_MEMTYPE_FLAG_FIXED)&& bo->ttm) {
> > - ttm_tt_unbind(bo->ttm);
> > - ttm_tt_destroy(bo->ttm);
> > + ttm_tt_unbind(bo);
> > + ttm_tt_destroy(bo);
> > bo->ttm = NULL;
> > }
> >
> > @@ -458,8 +458,8 @@ out_err:
> > static void ttm_bo_cleanup_memtype_use(struct ttm_buffer_object *bo)
> > {
> > if (bo->ttm) {
> > - ttm_tt_unbind(bo->ttm);
> > - ttm_tt_destroy(bo->ttm);
> > + ttm_tt_unbind(bo);
> > + ttm_tt_destroy(bo);
> > bo->ttm = NULL;
> > }
> > ttm_bo_mem_put(bo,&bo->mem);
> > diff --git a/drivers/gpu/drm/ttm/ttm_bo_util.c b/drivers/gpu/drm/ttm/ttm_bo_util.c
> > index 60f204d..aa09837 100644
> > --- a/drivers/gpu/drm/ttm/ttm_bo_util.c
> > +++ b/drivers/gpu/drm/ttm/ttm_bo_util.c
> > @@ -51,7 +51,7 @@ int ttm_bo_move_ttm(struct ttm_buffer_object *bo,
> > int ret;
> >
> > if (old_mem->mem_type != TTM_PL_SYSTEM) {
> > - ttm_tt_unbind(ttm);
> > + ttm_tt_unbind(bo);
> > ttm_bo_free_old_node(bo);
> > ttm_flag_masked(&old_mem->placement, TTM_PL_FLAG_SYSTEM,
> > TTM_PL_MASK_MEM);
> > @@ -63,7 +63,7 @@ int ttm_bo_move_ttm(struct ttm_buffer_object *bo,
> > return ret;
> >
> > if (new_mem->mem_type != TTM_PL_SYSTEM) {
> > - ret = ttm_tt_bind(ttm, new_mem);
> > + ret = ttm_tt_bind(bo, new_mem);
> > if (unlikely(ret != 0))
> > return ret;
> > }
> > @@ -381,8 +381,8 @@ out2:
> > new_mem->mm_node = NULL;
> >
> > if ((man->flags& TTM_MEMTYPE_FLAG_FIXED)&& (ttm != NULL)) {
> > - ttm_tt_unbind(ttm);
> > - ttm_tt_destroy(ttm);
> > + ttm_tt_unbind(bo);
> > + ttm_tt_destroy(bo);
> > bo->ttm = NULL;
> > }
> >
> > @@ -640,8 +640,8 @@ int ttm_bo_move_accel_cleanup(struct ttm_buffer_object *bo,
> >
> > if ((man->flags& TTM_MEMTYPE_FLAG_FIXED)&&
> > (bo->ttm != NULL)) {
> > - ttm_tt_unbind(bo->ttm);
> > - ttm_tt_destroy(bo->ttm);
> > + ttm_tt_unbind(bo);
> > + ttm_tt_destroy(bo);
> > bo->ttm = NULL;
> > }
> > ttm_bo_free_old_node(bo);
> > diff --git a/drivers/gpu/drm/ttm/ttm_tt.c b/drivers/gpu/drm/ttm/ttm_tt.c
> > index 58e1fa1..ceb8ef8 100644
> > --- a/drivers/gpu/drm/ttm/ttm_tt.c
> > +++ b/drivers/gpu/drm/ttm/ttm_tt.c
> > @@ -159,13 +159,15 @@ int ttm_tt_set_placement_caching(struct ttm_tt *ttm, uint32_t placement)
> > }
> > EXPORT_SYMBOL(ttm_tt_set_placement_caching);
> >
> > -void ttm_tt_destroy(struct ttm_tt *ttm)
> > +void ttm_tt_destroy(struct ttm_buffer_object *bo)
> > {
> > + struct ttm_tt *ttm = bo->ttm;
> > +
> > if (unlikely(ttm == NULL))
> > return;
> >
> > if (ttm->state == tt_bound) {
> > - ttm_tt_unbind(ttm);
> > + ttm_tt_unbind(bo);
> > }
> >
> > if (likely(ttm->pages != NULL)) {
> > @@ -194,7 +196,7 @@ int ttm_tt_init(struct ttm_tt *ttm, struct ttm_bo_device *bdev,
> >
> > ttm_tt_alloc_page_directory(ttm);
> > if (!ttm->pages) {
> > - ttm_tt_destroy(ttm);
> > + ttm->func->destroy(ttm);
> > printk(KERN_ERR TTM_PFX "Failed allocating page table\n");
> > return -ENOMEM;
> > }
> > @@ -226,7 +228,7 @@ int ttm_dma_tt_init(struct ttm_dma_tt *ttm_dma, struct ttm_bo_device *bdev,
> > INIT_LIST_HEAD(&ttm_dma->pages_list);
> > ttm_dma_tt_alloc_page_directory(ttm_dma);
> > if (!ttm->pages || !ttm_dma->dma_address) {
> > - ttm_tt_destroy(ttm);
> > + ttm->func->destroy(ttm);
> > printk(KERN_ERR TTM_PFX "Failed allocating page table\n");
> > return -ENOMEM;
> > }
> > @@ -245,36 +247,36 @@ void ttm_dma_tt_fini(struct ttm_dma_tt *ttm_dma)
> > }
> > EXPORT_SYMBOL(ttm_dma_tt_fini);
> >
> > -void ttm_tt_unbind(struct ttm_tt *ttm)
> > +void ttm_tt_unbind(struct ttm_buffer_object *bo)
> > {
> > int ret;
> >
> > - if (ttm->state == tt_bound) {
> > - ret = ttm->func->unbind(ttm);
> > + if (bo->ttm->state == tt_bound) {
> > + ret = bo->ttm->func->unbind(bo);
> > BUG_ON(ret);
> > - ttm->state = tt_unbound;
> > + bo->ttm->state = tt_unbound;
> > }
> > }
> >
> > -int ttm_tt_bind(struct ttm_tt *ttm, struct ttm_mem_reg *bo_mem)
> > +int ttm_tt_bind(struct ttm_buffer_object *bo, struct ttm_mem_reg *bo_mem)
> > {
> > int ret = 0;
> >
> > - if (!ttm)
> > + if (!bo->ttm)
> > return -EINVAL;
> >
> > - if (ttm->state == tt_bound)
> > + if (bo->ttm->state == tt_bound)
> > return 0;
> >
> > - ret = ttm->bdev->driver->ttm_tt_populate(ttm);
> > + ret = bo->ttm->bdev->driver->ttm_tt_populate(bo->ttm);
> > if (ret)
> > return ret;
> >
> > - ret = ttm->func->bind(ttm, bo_mem);
> > + ret = bo->ttm->func->bind(bo, bo_mem);
> > if (unlikely(ret != 0))
> > return ret;
> >
> > - ttm->state = tt_bound;
> > + bo->ttm->state = tt_bound;
> >
> > return 0;
> > }
> > diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_buffer.c b/drivers/gpu/drm/vmwgfx/vmwgfx_buffer.c
> > index 1e2c0fb..68ae2d9 100644
> > --- a/drivers/gpu/drm/vmwgfx/vmwgfx_buffer.c
> > +++ b/drivers/gpu/drm/vmwgfx/vmwgfx_buffer.c
> > @@ -146,8 +146,9 @@ struct vmw_ttm_tt {
> > int gmr_id;
> > };
> >
> > -static int vmw_ttm_bind(struct ttm_tt *ttm, struct ttm_mem_reg *bo_mem)
> > +static int vmw_ttm_bind(struct ttm_buffer_object *bo, struct ttm_mem_reg *bo_mem)
> > {
> > + struct ttm_tt *ttm = bo->ttm;
> > struct vmw_ttm_tt *vmw_be = container_of(ttm, struct vmw_ttm_tt, ttm);
> >
> > vmw_be->gmr_id = bo_mem->start;
> > @@ -156,8 +157,9 @@ static int vmw_ttm_bind(struct ttm_tt *ttm, struct ttm_mem_reg *bo_mem)
> > ttm->num_pages, vmw_be->gmr_id);
> > }
> >
> > -static int vmw_ttm_unbind(struct ttm_tt *ttm)
> > +static int vmw_ttm_unbind(struct ttm_buffer_object *bo)
> > {
> > + struct ttm_tt *ttm = bo->ttm;
> > struct vmw_ttm_tt *vmw_be = container_of(ttm, struct vmw_ttm_tt, ttm);
> >
> > vmw_gmr_unbind(vmw_be->dev_priv, vmw_be->gmr_id);
> > diff --git a/include/drm/ttm/ttm_bo_driver.h b/include/drm/ttm/ttm_bo_driver.h
> > index 2be8891..4ae39aa 100644
> > --- a/include/drm/ttm/ttm_bo_driver.h
> > +++ b/include/drm/ttm/ttm_bo_driver.h
> > @@ -45,7 +45,7 @@ struct ttm_backend_func {
> > /**
> > * struct ttm_backend_func member bind
> > *
> > - * @ttm: Pointer to a struct ttm_tt.
> > + * @bo: buffer object holding the ttm_tt struct we are binding.
> > * @bo_mem: Pointer to a struct ttm_mem_reg describing the
> > * memory type and location for binding.
> > *
> > @@ -53,7 +53,7 @@ struct ttm_backend_func {
> > * indicated by @bo_mem. This function should be able to handle
> > * differences between aperture and system page sizes.
> > */
> > - int (*bind) (struct ttm_tt *ttm, struct ttm_mem_reg *bo_mem);
> > + int (*bind) (struct ttm_buffer_object *bo, struct ttm_mem_reg *bo_mem);
> >
> > /**
> > * struct ttm_backend_func member unbind
> > @@ -63,7 +63,7 @@ struct ttm_backend_func {
> > * Unbind previously bound backend pages. This function should be
> > * able to handle differences between aperture and system page sizes.
> > */
> > - int (*unbind) (struct ttm_tt *ttm);
> > + int (*unbind) (struct ttm_buffer_object *bo);
> >
> > /**
> > * struct ttm_backend_func member destroy
> > @@ -625,16 +625,17 @@ extern void ttm_dma_tt_fini(struct ttm_dma_tt *ttm_dma);
> > *
> > * Bind the pages of @ttm to an aperture location identified by @bo_mem
> > */
> > -extern int ttm_tt_bind(struct ttm_tt *ttm, struct ttm_mem_reg *bo_mem);
> > +extern int ttm_tt_bind(struct ttm_buffer_object *bo,
> > + struct ttm_mem_reg *bo_mem);
> >
> > /**
> > * ttm_ttm_destroy:
> > *
> > - * @ttm: The struct ttm_tt.
> > + * @bo: buffer object holding the struct ttm_tt.
> > *
> > * Unbind, unpopulate and destroy common struct ttm_tt.
> > */
> > -extern void ttm_tt_destroy(struct ttm_tt *ttm);
> > +extern void ttm_tt_destroy(struct ttm_buffer_object *bo);
> >
> > /**
> > * ttm_ttm_unbind:
> > @@ -643,7 +644,7 @@ extern void ttm_tt_destroy(struct ttm_tt *ttm);
> > *
> > * Unbind a struct ttm_tt.
> > */
> > -extern void ttm_tt_unbind(struct ttm_tt *ttm);
> > +extern void ttm_tt_unbind(struct ttm_buffer_object *bo);
> >
> > /**
> > * ttm_tt_swapin:
> >
>
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