From ff663cf8705bea101d5f73cf471855c85242575e Mon Sep 17 00:00:00 2001 From: Zhenyu Wang Date: Thu, 23 Jul 2009 17:25:49 +0100 Subject: agp: Add generic support for graphics dma remapping New driver hooks for support graphics memory dma remapping are introduced in this patch. It makes generic code can tell if current device needs dma remapping, then call driver provided interfaces for mapping and unmapping. Change has also been made to handle scratch_page in remapping case. Signed-off-by: Zhenyu Wang Signed-off-by: David Woodhouse --- include/linux/agp_backend.h | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) (limited to 'include') diff --git a/include/linux/agp_backend.h b/include/linux/agp_backend.h index 76fa794fdac0..8a294d65b9b1 100644 --- a/include/linux/agp_backend.h +++ b/include/linux/agp_backend.h @@ -79,9 +79,13 @@ struct agp_memory { u32 physical; bool is_bound; bool is_flushed; - bool vmalloc_flag; + bool vmalloc_flag; + bool sg_vmalloc_flag; /* list of agp_memory mapped to the aperture */ struct list_head mapped_list; + /* DMA-mapped addresses */ + struct scatterlist *sg_list; + int num_sg; }; #define AGP_NORMAL_MEMORY 0 -- cgit v1.2.3 From f692775d7e0a22477143cd884e45c955448ac7d2 Mon Sep 17 00:00:00 2001 From: David Woodhouse Date: Wed, 29 Jul 2009 09:28:45 +0100 Subject: intel-agp: fix sglist allocation to avoid vmalloc() Signed-off-by: David Woodhouse --- drivers/char/agp/intel-agp.c | 29 ++++++++++------------------- include/linux/agp_backend.h | 1 - 2 files changed, 10 insertions(+), 20 deletions(-) (limited to 'include') diff --git a/drivers/char/agp/intel-agp.c b/drivers/char/agp/intel-agp.c index b9d9886ff3c3..d8c80d8be5e2 100644 --- a/drivers/char/agp/intel-agp.c +++ b/drivers/char/agp/intel-agp.c @@ -198,39 +198,30 @@ static void intel_agp_unmap_page(struct page *page, dma_addr_t dma) static void intel_agp_free_sglist(struct agp_memory *mem) { + struct sg_table st; + + st.sgl = mem->sg_list; + st.orig_nents = st.nents = mem->page_count; + + sg_free_table(&st); - if (mem->sg_vmalloc_flag) - vfree(mem->sg_list); - else - kfree(mem->sg_list); - mem->sg_vmalloc_flag = 0; mem->sg_list = NULL; mem->num_sg = 0; } static int intel_agp_map_memory(struct agp_memory *mem) { + struct sg_table st; struct scatterlist *sg; int i; DBG("try mapping %lu pages\n", (unsigned long)mem->page_count); - if ((mem->page_count * sizeof(*mem->sg_list)) < 2*PAGE_SIZE) - mem->sg_list = kcalloc(mem->page_count, sizeof(*mem->sg_list), - GFP_KERNEL); - - if (mem->sg_list == NULL) { - mem->sg_list = vmalloc(mem->page_count * sizeof(*mem->sg_list)); - mem->sg_vmalloc_flag = 1; - } - - if (!mem->sg_list) { - mem->sg_vmalloc_flag = 0; + if (sg_alloc_table(&st, mem->page_count, GFP_KERNEL)) return -ENOMEM; - } - sg_init_table(mem->sg_list, mem->page_count); - sg = mem->sg_list; + mem->sg_list = sg = st.sgl; + for (i = 0 ; i < mem->page_count; i++, sg = sg_next(sg)) sg_set_page(sg, mem->pages[i], PAGE_SIZE, 0); diff --git a/include/linux/agp_backend.h b/include/linux/agp_backend.h index 8a294d65b9b1..880130f7311f 100644 --- a/include/linux/agp_backend.h +++ b/include/linux/agp_backend.h @@ -80,7 +80,6 @@ struct agp_memory { bool is_bound; bool is_flushed; bool vmalloc_flag; - bool sg_vmalloc_flag; /* list of agp_memory mapped to the aperture */ struct list_head mapped_list; /* DMA-mapped addresses */ -- cgit v1.2.3