linux-kernel - [PATCH v2 01/12] drm/ttm: add ttm_bo_io_mem_pfn to check io_mem

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Date:   Mon, 25 Dec 2017 11:43:23 +0800
From:   Tan Xiaojun <tanxiaojun@...wei.com>
To:     <seanpaul@...omium.org>, <christian.koenig@....com>,
        <airlied@...ux.ie>, <michel.daenzer@....com>,
        <alexander.deucher@....com>, <nicolai.haehnle@....com>,
        <thomas.lendacky@....com>, <yamada.masahiro@...ionext.com>,
        <msrb@...e.com>, <Felix.Kuehling@....com>, <dave.jiang@...el.com>,
        <gregkh@...uxfoundation.org>, <michael.thayer@...cle.com>,
        <hdegoede@...hat.com>
CC:     <daniel.vetter@...el.com>, <jani.nikula@...ux.intel.com>,
        <wangzhou1@...ilicon.com>, <dri-devel@...ts.freedesktop.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH v2 01/12] drm/ttm: add ttm_bo_io_mem_pfn to check io_mem_pfn

The io_mem_pfn field was added in commit ea642c3216cb ("drm/ttm: add
io_mem_pfn callback") and is called unconditionally. However, not all
drivers were updated to set it.

Use the ttm_bo_default_io_mem_pfn function if a driver did not set its
own. And add new function ttm_bo_io_mem_pfn() as wrapper.

Signed-off-by: Michal Srb <msrb@...e.com>
Signed-off-by: Tan Xiaojun <tanxiaojun@...wei.com>
---
 drivers/gpu/drm/ttm/ttm_bo_vm.c | 13 ++++++++++++-
 1 file changed, 12 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/ttm/ttm_bo_vm.c b/drivers/gpu/drm/ttm/ttm_bo_vm.c
index c8ebb75..292d157 100644
--- a/drivers/gpu/drm/ttm/ttm_bo_vm.c
+++ b/drivers/gpu/drm/ttm/ttm_bo_vm.c
@@ -92,6 +92,17 @@ static int ttm_bo_vm_fault_idle(struct ttm_buffer_object *bo,
 	return ret;
 }
 
+static unsigned long ttm_bo_io_mem_pfn(struct ttm_buffer_object *bo,
+				       unsigned long page_offset)
+{
+	struct ttm_bo_device *bdev = bo->bdev;
+
+	if (bdev->driver->io_mem_pfn)
+		return bdev->driver->io_mem_pfn(bo, page_offset);
+
+	return ttm_bo_default_io_mem_pfn(bo, page_offset);
+}
+
 static int ttm_bo_vm_fault(struct vm_fault *vmf)
 {
 	struct vm_area_struct *vma = vmf->vma;
@@ -234,7 +245,7 @@ static int ttm_bo_vm_fault(struct vm_fault *vmf)
 		if (bo->mem.bus.is_iomem) {
 			/* Iomem should not be marked encrypted */
 			cvma.vm_page_prot = pgprot_decrypted(cvma.vm_page_prot);
-			pfn = bdev->driver->io_mem_pfn(bo, page_offset);
+			pfn = ttm_bo_io_mem_pfn(bo, page_offset);
 		} else {
 			page = ttm->pages[page_offset];
 			if (unlikely(!page && i == 0)) {
-- 
2.7.4