[Intel-gfx] [PATCH 1/2] drm/i915: Add i915_gem_object_vmap to map GEM object to virtual space
yu.dai at intel.com
yu.dai at intel.com
Wed Feb 17 23:18:27 UTC 2016
From: Alex Dai <yu.dai at intel.com>
There are several places inside driver where a GEM object is mapped to
kernel virtual space. The mapping is either done for the whole object
or certain page range of it.
This patch introduces a function i915_gem_object_vmap to do such job.
Signed-off-by: Alex Dai <yu.dai at intel.com>
Cc: Dave Gordon <david.s.gordon at intel.com>
Cc: Daniel Vetter <daniel.vetter at ffwll.ch>
Cc: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
---
drivers/gpu/drm/i915/i915_cmd_parser.c | 28 +--------------------
drivers/gpu/drm/i915/i915_drv.h | 3 +++
drivers/gpu/drm/i915/i915_gem.c | 44 +++++++++++++++++++++++++++++++++
drivers/gpu/drm/i915/i915_gem_dmabuf.c | 15 ++---------
drivers/gpu/drm/i915/intel_ringbuffer.c | 24 ++----------------
5 files changed, 52 insertions(+), 62 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_cmd_parser.c b/drivers/gpu/drm/i915/i915_cmd_parser.c
index 814d894..915e8c1 100644
--- a/drivers/gpu/drm/i915/i915_cmd_parser.c
+++ b/drivers/gpu/drm/i915/i915_cmd_parser.c
@@ -863,37 +863,11 @@ find_reg(const struct drm_i915_reg_descriptor *table,
static u32 *vmap_batch(struct drm_i915_gem_object *obj,
unsigned start, unsigned len)
{
- int i;
- void *addr = NULL;
- struct sg_page_iter sg_iter;
int first_page = start >> PAGE_SHIFT;
int last_page = (len + start + 4095) >> PAGE_SHIFT;
int npages = last_page - first_page;
- struct page **pages;
-
- pages = drm_malloc_ab(npages, sizeof(*pages));
- if (pages == NULL) {
- DRM_DEBUG_DRIVER("Failed to get space for pages\n");
- goto finish;
- }
-
- i = 0;
- for_each_sg_page(obj->pages->sgl, &sg_iter, obj->pages->nents, first_page) {
- pages[i++] = sg_page_iter_page(&sg_iter);
- if (i == npages)
- break;
- }
-
- addr = vmap(pages, i, 0, PAGE_KERNEL);
- if (addr == NULL) {
- DRM_DEBUG_DRIVER("Failed to vmap pages\n");
- goto finish;
- }
-finish:
- if (pages)
- drm_free_large(pages);
- return (u32*)addr;
+ return (u32*)i915_gem_object_vmap(obj, first_page, npages);
}
/* Returns a vmap'd pointer to dest_obj, which the caller must unmap */
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 6644c2e..5b00a6a 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -2899,6 +2899,9 @@ struct drm_i915_gem_object *i915_gem_object_create_from_data(
struct drm_device *dev, const void *data, size_t size);
void i915_gem_free_object(struct drm_gem_object *obj);
void i915_gem_vma_destroy(struct i915_vma *vma);
+void *i915_gem_object_vmap(struct drm_i915_gem_object *obj,
+ unsigned int first,
+ unsigned int npages);
/* Flags used by pin/bind&friends. */
#define PIN_MAPPABLE (1<<0)
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index f68f346..a6f465b 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -5356,3 +5356,47 @@ fail:
drm_gem_object_unreference(&obj->base);
return ERR_PTR(ret);
}
+
+/**
+ * i915_gem_object_vmap - map a GEM obj into kernel virtual space
+ * @obj: the GEM obj to be mapped
+ * @first: index of the first page where mapping starts
+ * @npages: how many pages to be mapped, starting from first page
+ *
+ * Map a given page range of GEM obj into kernel virtual space. The caller must
+ * make sure the associated pages are gathered and pinned before calling this
+ * function. vunmap should be called after use.
+ *
+ * NULL will be returned if fails.
+ */
+void *i915_gem_object_vmap(struct drm_i915_gem_object *obj,
+ unsigned int first,
+ unsigned int npages)
+{
+ struct sg_page_iter sg_iter;
+ struct page **pages;
+ void *addr;
+ int i;
+
+ if (first + npages > obj->pages->nents) {
+ DRM_DEBUG_DRIVER("Invalid page count\n");
+ return NULL;
+ }
+
+ pages = drm_malloc_ab(npages, sizeof(*pages));
+ if (pages == NULL) {
+ DRM_DEBUG_DRIVER("Failed to get space for pages\n");
+ return NULL;
+ }
+
+ i = 0;
+ for_each_sg_page(obj->pages->sgl, &sg_iter, npages, first)
+ pages[i++] = sg_page_iter_page(&sg_iter);
+
+ addr = vmap(pages, npages, 0, PAGE_KERNEL);
+ if (addr == NULL)
+ DRM_DEBUG_DRIVER("Failed to vmap pages\n");
+ drm_free_large(pages);
+
+ return addr;
+}
diff --git a/drivers/gpu/drm/i915/i915_gem_dmabuf.c b/drivers/gpu/drm/i915/i915_gem_dmabuf.c
index 1f3eef6..d269957 100644
--- a/drivers/gpu/drm/i915/i915_gem_dmabuf.c
+++ b/drivers/gpu/drm/i915/i915_gem_dmabuf.c
@@ -110,9 +110,7 @@ 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;
- struct sg_page_iter sg_iter;
- struct page **pages;
- int ret, i;
+ int ret;
ret = i915_mutex_lock_interruptible(dev);
if (ret)
@@ -131,16 +129,7 @@ static void *i915_gem_dmabuf_vmap(struct dma_buf *dma_buf)
ret = -ENOMEM;
- pages = drm_malloc_ab(obj->base.size >> PAGE_SHIFT, sizeof(*pages));
- if (pages == NULL)
- goto err_unpin;
-
- i = 0;
- for_each_sg_page(obj->pages->sgl, &sg_iter, obj->pages->nents, 0)
- pages[i++] = sg_page_iter_page(&sg_iter);
-
- obj->dma_buf_vmapping = vmap(pages, i, 0, PAGE_KERNEL);
- drm_free_large(pages);
+ obj->dma_buf_vmapping = i915_gem_object_vmap(obj, 0, obj->pages->nents);
if (!obj->dma_buf_vmapping)
goto err_unpin;
diff --git a/drivers/gpu/drm/i915/intel_ringbuffer.c b/drivers/gpu/drm/i915/intel_ringbuffer.c
index 45ce45a..fe6d14a 100644
--- a/drivers/gpu/drm/i915/intel_ringbuffer.c
+++ b/drivers/gpu/drm/i915/intel_ringbuffer.c
@@ -2064,27 +2064,6 @@ void intel_unpin_ringbuffer_obj(struct intel_ringbuffer *ringbuf)
i915_gem_object_ggtt_unpin(ringbuf->obj);
}
-static u32 *vmap_obj(struct drm_i915_gem_object *obj)
-{
- struct sg_page_iter sg_iter;
- struct page **pages;
- void *addr;
- int i;
-
- pages = drm_malloc_ab(obj->base.size >> PAGE_SHIFT, sizeof(*pages));
- if (pages == NULL)
- return NULL;
-
- i = 0;
- for_each_sg_page(obj->pages->sgl, &sg_iter, obj->pages->nents, 0)
- pages[i++] = sg_page_iter_page(&sg_iter);
-
- addr = vmap(pages, i, 0, PAGE_KERNEL);
- drm_free_large(pages);
-
- return addr;
-}
-
int intel_pin_and_map_ringbuffer_obj(struct drm_device *dev,
struct intel_ringbuffer *ringbuf)
{
@@ -2103,7 +2082,8 @@ int intel_pin_and_map_ringbuffer_obj(struct drm_device *dev,
return ret;
}
- ringbuf->virtual_start = vmap_obj(obj);
+ ringbuf->virtual_start =
+ i915_gem_object_vmap(obj, 0, obj->pages->nents);
if (ringbuf->virtual_start == NULL) {
i915_gem_object_ggtt_unpin(obj);
return -ENOMEM;
--
2.5.0
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