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path: root/drivers/gpu/drm/vmwgfx/vmwgfx_gmr.c
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Diffstat (limited to 'drivers/gpu/drm/vmwgfx/vmwgfx_gmr.c')
-rw-r--r--drivers/gpu/drm/vmwgfx/vmwgfx_gmr.c213
1 files changed, 213 insertions, 0 deletions
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_gmr.c b/drivers/gpu/drm/vmwgfx/vmwgfx_gmr.c
new file mode 100644
index 00000000000..5f8908a5d7f
--- /dev/null
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_gmr.c
@@ -0,0 +1,213 @@
+/**************************************************************************
+ *
+ * Copyright © 2009 VMware, Inc., Palo Alto, CA., USA
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the
+ * "Software"), to deal in the Software without restriction, including
+ * without limitation the rights to use, copy, modify, merge, publish,
+ * distribute, sub license, and/or sell copies of the Software, and to
+ * permit persons to whom the Software is furnished to do so, subject to
+ * the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the
+ * next paragraph) shall be included in all copies or substantial portions
+ * of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT. IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDERS, AUTHORS AND/OR ITS SUPPLIERS BE LIABLE FOR ANY CLAIM,
+ * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
+ * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
+ * USE OR OTHER DEALINGS IN THE SOFTWARE.
+ *
+ **************************************************************************/
+
+#include "vmwgfx_drv.h"
+#include "drmP.h"
+#include "ttm/ttm_bo_driver.h"
+
+/**
+ * FIXME: Adjust to the ttm lowmem / highmem storage to minimize
+ * the number of used descriptors.
+ */
+
+static int vmw_gmr_build_descriptors(struct list_head *desc_pages,
+ struct page *pages[],
+ unsigned long num_pages)
+{
+ struct page *page, *next;
+ struct svga_guest_mem_descriptor *page_virtual = NULL;
+ struct svga_guest_mem_descriptor *desc_virtual = NULL;
+ unsigned int desc_per_page;
+ unsigned long prev_pfn;
+ unsigned long pfn;
+ int ret;
+
+ desc_per_page = PAGE_SIZE /
+ sizeof(struct svga_guest_mem_descriptor) - 1;
+
+ while (likely(num_pages != 0)) {
+ page = alloc_page(__GFP_HIGHMEM);
+ if (unlikely(page == NULL)) {
+ ret = -ENOMEM;
+ goto out_err;
+ }
+
+ list_add_tail(&page->lru, desc_pages);
+
+ /*
+ * Point previous page terminating descriptor to this
+ * page before unmapping it.
+ */
+
+ if (likely(page_virtual != NULL)) {
+ desc_virtual->ppn = page_to_pfn(page);
+ kunmap_atomic(page_virtual, KM_USER0);
+ }
+
+ page_virtual = kmap_atomic(page, KM_USER0);
+ desc_virtual = page_virtual - 1;
+ prev_pfn = ~(0UL);
+
+ while (likely(num_pages != 0)) {
+ pfn = page_to_pfn(*pages);
+
+ if (pfn != prev_pfn + 1) {
+
+ if (desc_virtual - page_virtual ==
+ desc_per_page - 1)
+ break;
+
+ (++desc_virtual)->ppn = cpu_to_le32(pfn);
+ desc_virtual->num_pages = cpu_to_le32(1);
+ } else {
+ uint32_t tmp =
+ le32_to_cpu(desc_virtual->num_pages);
+ desc_virtual->num_pages = cpu_to_le32(tmp + 1);
+ }
+ prev_pfn = pfn;
+ --num_pages;
+ ++pages;
+ }
+
+ (++desc_virtual)->ppn = cpu_to_le32(0);
+ desc_virtual->num_pages = cpu_to_le32(0);
+ }
+
+ if (likely(page_virtual != NULL))
+ kunmap_atomic(page_virtual, KM_USER0);
+
+ return 0;
+out_err:
+ list_for_each_entry_safe(page, next, desc_pages, lru) {
+ list_del_init(&page->lru);
+ __free_page(page);
+ }
+ return ret;
+}
+
+static inline void vmw_gmr_free_descriptors(struct list_head *desc_pages)
+{
+ struct page *page, *next;
+
+ list_for_each_entry_safe(page, next, desc_pages, lru) {
+ list_del_init(&page->lru);
+ __free_page(page);
+ }
+}
+
+static void vmw_gmr_fire_descriptors(struct vmw_private *dev_priv,
+ int gmr_id, struct list_head *desc_pages)
+{
+ struct page *page;
+
+ if (unlikely(list_empty(desc_pages)))
+ return;
+
+ page = list_entry(desc_pages->next, struct page, lru);
+
+ mutex_lock(&dev_priv->hw_mutex);
+
+ vmw_write(dev_priv, SVGA_REG_GMR_ID, gmr_id);
+ wmb();
+ vmw_write(dev_priv, SVGA_REG_GMR_DESCRIPTOR, page_to_pfn(page));
+ mb();
+
+ mutex_unlock(&dev_priv->hw_mutex);
+
+}
+
+/**
+ * FIXME: Adjust to the ttm lowmem / highmem storage to minimize
+ * the number of used descriptors.
+ */
+
+static unsigned long vmw_gmr_count_descriptors(struct page *pages[],
+ unsigned long num_pages)
+{
+ unsigned long prev_pfn = ~(0UL);
+ unsigned long pfn;
+ unsigned long descriptors = 0;
+
+ while (num_pages--) {
+ pfn = page_to_pfn(*pages++);
+ if (prev_pfn + 1 != pfn)
+ ++descriptors;
+ prev_pfn = pfn;
+ }
+
+ return descriptors;
+}
+
+int vmw_gmr_bind(struct vmw_private *dev_priv,
+ struct ttm_buffer_object *bo)
+{
+ struct ttm_tt *ttm = bo->ttm;
+ unsigned long descriptors;
+ int ret;
+ uint32_t id;
+ struct list_head desc_pages;
+
+ if (!(dev_priv->capabilities & SVGA_CAP_GMR))
+ return -EINVAL;
+
+ ret = ttm_tt_populate(ttm);
+ if (unlikely(ret != 0))
+ return ret;
+
+ descriptors = vmw_gmr_count_descriptors(ttm->pages, ttm->num_pages);
+ if (unlikely(descriptors > dev_priv->max_gmr_descriptors))
+ return -EINVAL;
+
+ INIT_LIST_HEAD(&desc_pages);
+ ret = vmw_gmr_build_descriptors(&desc_pages, ttm->pages,
+ ttm->num_pages);
+ if (unlikely(ret != 0))
+ return ret;
+
+ ret = vmw_gmr_id_alloc(dev_priv, &id);
+ if (unlikely(ret != 0))
+ goto out_no_id;
+
+ vmw_gmr_fire_descriptors(dev_priv, id, &desc_pages);
+ vmw_gmr_free_descriptors(&desc_pages);
+ vmw_dmabuf_set_gmr(bo, id);
+ return 0;
+
+out_no_id:
+ vmw_gmr_free_descriptors(&desc_pages);
+ return ret;
+}
+
+void vmw_gmr_unbind(struct vmw_private *dev_priv, int gmr_id)
+{
+ mutex_lock(&dev_priv->hw_mutex);
+ vmw_write(dev_priv, SVGA_REG_GMR_ID, gmr_id);
+ wmb();
+ vmw_write(dev_priv, SVGA_REG_GMR_DESCRIPTOR, 0);
+ mb();
+ mutex_unlock(&dev_priv->hw_mutex);
+}