This is essentially Chris Wilson's patch of a similar name, reworked on
top of Alex Dai's recent patch:
drm/i915: Add i915_gem_object_vmap to map GEM object to virtual space
Chris' original commentary said:
We now have two implementations for vmapping a whole object, one for
dma-buf and one for the ringbuffer. If we couple the vmapping into
the obj->pages lifetime, then we can reuse an obj->vmapping for both
and at the same time couple it into the shrinker.
v2: Mark the failable kmalloc() as __GFP_NOWARN (vsyrjala)
v3: Call unpin_vmap from the right dmabuf unmapper
This patch [v4] reimplements the same functionality, but now as wrappers
round the recently-introduced i915_gem_object_vmap_range() from Alex's
patch mentioned above.
With this change, we have only one vmap() in the whole driver :)
Signed-off-by: Dave Gordon <david.s.gor...@intel.com>
Cc: Chris Wilson <ch...@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursu...@intel.com>
---
drivers/gpu/drm/i915/i915_drv.h | 11 +++++----
drivers/gpu/drm/i915/i915_gem.c | 39 +++++++++++++++++++++++++++++++
drivers/gpu/drm/i915/i915_gem_dmabuf.c | 41 ++++-----------------------------
drivers/gpu/drm/i915/intel_ringbuffer.c | 32 ++++++++++++-------------
4 files changed, 67 insertions(+), 56 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 8cd47c6..b237ebd 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -2168,10 +2168,7 @@ struct drm_i915_gem_object {
struct scatterlist *sg;
int last;
} get_page;
-
- /* prime dma-buf support */
- void *dma_buf_vmapping;
- int vmapping_count;
+ void *vmapping;
/** Breadcrumb of last rendering to the buffer.
* There can only be one writer, but we allow for multiple readers.
@@ -2979,6 +2976,12 @@ static inline void i915_gem_object_unpin_pages(struct
drm_i915_gem_object *obj)
obj->pages_pin_count--;
}
+void *__must_check i915_gem_object_pin_vmap(struct drm_i915_gem_object *obj);
+static inline void i915_gem_object_unpin_vmap(struct drm_i915_gem_object *obj)
+{
+ i915_gem_object_unpin_pages(obj);
+}
+
void *__must_check i915_gem_object_vmap_range(struct drm_i915_gem_object *obj,
unsigned int first,
unsigned int npages);
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 0d5709a..14942cf 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -2235,6 +2235,11 @@ static void i915_gem_object_free_mmap_offset(struct
drm_i915_gem_object *obj)
ops->put_pages(obj);
obj->pages = NULL;
+ if (obj->vmapping) {
+ vunmap(obj->vmapping);
+ obj->vmapping = NULL;
+ }
+
i915_gem_object_invalidate(obj);
return 0;
@@ -2447,6 +2452,40 @@ void *i915_gem_object_vmap_range(struct
drm_i915_gem_object *obj,
return addr;
}
+/**
+ * i915_gem_object_pin_vmap - pin a GEM object and map it into kernel space
+ * @obj: the GEM object to be mapped
+ *
+ * Conbines the functions of get_pages(), pin_pages() and vmap_range() on
+ * the whole object. The caller should release the mappoing by calling
+ * i915_gem_object_unpin_vmap() when the object is no longer required.
+ * function.
+ *
+ * Returns an ERR_PTR on failure.
+ */
+void *i915_gem_object_pin_vmap(struct drm_i915_gem_object *obj)
+{
+ int ret;
+
+ ret = i915_gem_object_get_pages(obj);
+ if (ret)
+ return ERR_PTR(ret);
+
+ i915_gem_object_pin_pages(obj);
+
+ if (obj->vmapping == NULL) {
+ obj->vmapping = i915_gem_object_vmap_range(obj, 0,
+ obj->base.size >> PAGE_SHIFT);
+
+ if (obj->vmapping == NULL) {
+ i915_gem_object_unpin_pages(obj);
+ return ERR_PTR(-ENOMEM);
+ }
+ }
+
+ return obj->vmapping;
+}
+
void i915_vma_move_to_active(struct i915_vma *vma,
struct drm_i915_gem_request *req)
{
diff --git a/drivers/gpu/drm/i915/i915_gem_dmabuf.c
b/drivers/gpu/drm/i915/i915_gem_dmabuf.c
index aee4149..adc7b5e 100644
--- a/drivers/gpu/drm/i915/i915_gem_dmabuf.c
+++ b/drivers/gpu/drm/i915/i915_gem_dmabuf.c
@@ -95,14 +95,12 @@ static void i915_gem_unmap_dma_buf(struct
dma_buf_attachment *attachment,
{
struct drm_i915_gem_object *obj = dma_buf_to_obj(attachment->dmabuf);
- mutex_lock(&obj->base.dev->struct_mutex);
-
dma_unmap_sg(attachment->dev, sg->sgl, sg->nents, dir);
sg_free_table(sg);
kfree(sg);
+ mutex_lock(&obj->base.dev->struct_mutex);
i915_gem_object_unpin_pages(obj);
-
mutex_unlock(&obj->base.dev->struct_mutex);
}
@@ -110,41 +108,17 @@ static void *i915_gem_dmabuf_vmap(struct dma_buf *dma_buf)
{
struct drm_i915_gem_object *obj = dma_buf_to_obj(dma_buf);
struct drm_device *dev = obj->base.dev;
+ void *addr;
int ret;
ret = i915_mutex_lock_interruptible(dev);
if (ret)
return ERR_PTR(ret);
- if (obj->dma_buf_vmapping) {
- obj->vmapping_count++;
- goto out_unlock;
- }
-
- ret = i915_gem_object_get_pages(obj);
- if (ret)
- goto err;
-
- i915_gem_object_pin_pages(obj);
-
- ret = -ENOMEM;
-
- obj->dma_buf_vmapping = i915_gem_object_vmap_range(obj, 0,
- dma_buf->size >> PAGE_SHIFT);
-
- if (!obj->dma_buf_vmapping)
- goto err_unpin;
-
- obj->vmapping_count = 1;
-out_unlock:
+ addr = i915_gem_object_pin_vmap(obj);
mutex_unlock(&dev->struct_mutex);
- return obj->dma_buf_vmapping;
-err_unpin:
- i915_gem_object_unpin_pages(obj);
-err:
- mutex_unlock(&dev->struct_mutex);
- return ERR_PTR(ret);
+ return addr;
}
static void i915_gem_dmabuf_vunmap(struct dma_buf *dma_buf, void *vaddr)
@@ -153,12 +127,7 @@ static void i915_gem_dmabuf_vunmap(struct dma_buf
*dma_buf, void *vaddr)
struct drm_device *dev = obj->base.dev;
mutex_lock(&dev->struct_mutex);
- if (--obj->vmapping_count == 0) {
- vunmap(obj->dma_buf_vmapping);
- obj->dma_buf_vmapping = NULL;
-
- i915_gem_object_unpin_pages(obj);
- }
+ i915_gem_object_unpin_vmap(obj);
mutex_unlock(&dev->struct_mutex);
}
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c
b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 434a452..47f186e 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -2056,7 +2056,7 @@ static int init_phys_status_page(struct intel_engine_cs
*ring)
void intel_unpin_ringbuffer_obj(struct intel_ringbuffer *ringbuf)
{
if (HAS_LLC(ringbuf->obj->base.dev) && !ringbuf->obj->stolen)
- vunmap(ringbuf->virtual_start);
+ i915_gem_object_unpin_vmap(ringbuf->obj);
else
iounmap(ringbuf->virtual_start);
ringbuf->virtual_start = NULL;
@@ -2077,16 +2077,14 @@ int intel_pin_and_map_ringbuffer_obj(struct drm_device
*dev,
return ret;
ret = i915_gem_object_set_to_cpu_domain(obj, true);
- if (ret) {
- i915_gem_object_ggtt_unpin(obj);
- return ret;
- }
+ if (ret)
+ goto unpin;
- ringbuf->virtual_start = i915_gem_object_vmap_range(obj, 0,
- ringbuf->size >> PAGE_SHIFT);
- if (ringbuf->virtual_start == NULL) {
- i915_gem_object_ggtt_unpin(obj);
- return -ENOMEM;
+ ringbuf->virtual_start = i915_gem_object_pin_vmap(obj);
+ if (IS_ERR(ringbuf->virtual_start)) {
+ ret = PTR_ERR(ringbuf->virtual_start);
+ ringbuf->virtual_start = NULL;
+ goto unpin;
}
} else {
ret = i915_gem_obj_ggtt_pin(obj, PAGE_SIZE, PIN_MAPPABLE);
@@ -2094,10 +2092,8 @@ int intel_pin_and_map_ringbuffer_obj(struct drm_device
*dev,
return ret;
ret = i915_gem_object_set_to_gtt_domain(obj, true);
- if (ret) {
- i915_gem_object_ggtt_unpin(obj);
- return ret;
- }
+ if (ret)
+ goto unpin;
/* Access through the GTT requires the device to be awake. */
assert_rpm_wakelock_held(dev_priv);
@@ -2105,14 +2101,18 @@ int intel_pin_and_map_ringbuffer_obj(struct drm_device
*dev,
ringbuf->virtual_start = ioremap_wc(dev_priv->gtt.mappable_base
+
i915_gem_obj_ggtt_offset(obj), ringbuf->size);
if (ringbuf->virtual_start == NULL) {
- i915_gem_object_ggtt_unpin(obj);
- return -EINVAL;
+ ret = -ENOMEM;
+ goto unpin;
}
}
ringbuf->vma = i915_gem_obj_to_ggtt(obj);
return 0;
+
+unpin:
+ i915_gem_object_ggtt_unpin(obj);
+ return ret;
}
static void intel_destroy_ringbuffer_obj(struct intel_ringbuffer *ringbuf)
--
1.9.1
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