drm/i915/error: Fix object page offset within a region

io_mapping_map_wc() expects the offset to be relative to the iomapping
base address. Currently we just pass in the physical address for the
page which only works if the region.start starts at zero.

Signed-off-by: CQ Tang <cq.tang@intel.com>
Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: https://patchwork.freedesktop.org/patch/msgid/20210119133106.66294-2-matthew.auld@intel.com

diff --git a/drivers/gpu/drm/i915/i915_gpu_error.c b/drivers/gpu/drm/i915/i915_gpu_error.c
index 8b163ee..f962693 100644 (file)
--- a/drivers/gpu/drm/i915/i915_gpu_error.c
+++ b/drivers/gpu/drm/i915/i915_gpu_error.c
@@ -1051,7 +1051,9 @@ i915_vma_coredump_create(const struct intel_gt *gt,
                for_each_sgt_daddr(dma, iter, vma->pages) {
                        void __iomem *s;
 
-                       s = io_mapping_map_wc(&mem->iomap, dma, PAGE_SIZE);
+                       s = io_mapping_map_wc(&mem->iomap,
+                                             dma - mem->region.start,
+                                             PAGE_SIZE);
                        ret = compress_page(compress,
                                            (void __force *)s, dst,
                                            true);