From: Alexander Shishkin alexander.shishkin@linux.intel.com
commit 4e0eaf239fb33ebc671303e2b736fa043462e2f4 upstream.
Currently, the pages that are allocated for the single mode of MSC are not mapped into the device's dma space and the code is incorrectly using *_to_phys() in place of a dma address. This fails with IOMMU enabled and is otherwise bad practice.
Fix the single mode buffer allocation to map the pages into the device's DMA space.
Signed-off-by: Alexander Shishkin alexander.shishkin@linux.intel.com Fixes: ba82664c134e ("intel_th: Add Memory Storage Unit driver") Cc: stable@vger.kernel.org # v4.4+ Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/hwtracing/intel_th/msu.c | 35 ++++++++++++++++++++++++++++++++--- 1 file changed, 32 insertions(+), 3 deletions(-)
--- a/drivers/hwtracing/intel_th/msu.c +++ b/drivers/hwtracing/intel_th/msu.c @@ -90,6 +90,7 @@ struct msc_iter { * @reg_base: register window base address * @thdev: intel_th_device pointer * @win_list: list of windows in multiblock mode + * @single_sgt: single mode buffer * @nr_pages: total number of pages allocated for this buffer * @single_sz: amount of data in single mode * @single_wrap: single mode wrap occurred @@ -110,6 +111,7 @@ struct msc { struct intel_th_device *thdev;
struct list_head win_list; + struct sg_table single_sgt; unsigned long nr_pages; unsigned long single_sz; unsigned int single_wrap : 1; @@ -610,22 +612,45 @@ static void intel_th_msc_deactivate(stru */ static int msc_buffer_contig_alloc(struct msc *msc, unsigned long size) { + unsigned long nr_pages = size >> PAGE_SHIFT; unsigned int order = get_order(size); struct page *page; + int ret;
if (!size) return 0;
+ ret = sg_alloc_table(&msc->single_sgt, 1, GFP_KERNEL); + if (ret) + goto err_out; + + ret = -ENOMEM; page = alloc_pages(GFP_KERNEL | __GFP_ZERO, order); if (!page) - return -ENOMEM; + goto err_free_sgt;
split_page(page, order); - msc->nr_pages = size >> PAGE_SHIFT; + sg_set_buf(msc->single_sgt.sgl, page_address(page), size); + + ret = dma_map_sg(msc_dev(msc)->parent->parent, msc->single_sgt.sgl, 1, + DMA_FROM_DEVICE); + if (ret < 0) + goto err_free_pages; + + msc->nr_pages = nr_pages; msc->base = page_address(page); - msc->base_addr = page_to_phys(page); + msc->base_addr = sg_dma_address(msc->single_sgt.sgl);
return 0; + +err_free_pages: + __free_pages(page, order); + +err_free_sgt: + sg_free_table(&msc->single_sgt); + +err_out: + return ret; }
/** @@ -636,6 +661,10 @@ static void msc_buffer_contig_free(struc { unsigned long off;
+ dma_unmap_sg(msc_dev(msc)->parent->parent, msc->single_sgt.sgl, + 1, DMA_FROM_DEVICE); + sg_free_table(&msc->single_sgt); + for (off = 0; off < msc->nr_pages << PAGE_SHIFT; off += PAGE_SIZE) { struct page *page = virt_to_page(msc->base + off);