diff options
Diffstat (limited to 'drivers/gpu/drm/vmwgfx/vmwgfx_gmr.c')
| -rw-r--r-- | drivers/gpu/drm/vmwgfx/vmwgfx_gmr.c | 213 |
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); +} |