[Intel-gfx] [PATCH 07/10] drm/i915/error: skip non-mappable pages

[Das, Nirmoy]

Reviewed-by: Nirmoy Das <nirmoy.das at intel.com>

On 5/25/2022 8:43 PM, Matthew Auld wrote:
> Skip capturing any lmem pages that can't be copied using the CPU. This
> in now only best effort on platforms that have small BAR.
>
> Testcase: igt at gem-exec-capture@capture-invisible
> Signed-off-by: Matthew Auld <matthew.auld at intel.com>
> Cc: Thomas Hellström <thomas.hellstrom at linux.intel.com>
> Cc: Lionel Landwerlin <lionel.g.landwerlin at intel.com>
> Cc: Tvrtko Ursulin <tvrtko.ursulin at linux.intel.com>
> Cc: Jon Bloomfield <jon.bloomfield at intel.com>
> Cc: Daniel Vetter <daniel.vetter at ffwll.ch>
> Cc: Jordan Justen <jordan.l.justen at intel.com>
> Cc: Kenneth Graunke <kenneth at whitecape.org>
> Cc: Akeem G Abodunrin <akeem.g.abodunrin at intel.com>
> ---
>   drivers/gpu/drm/i915/i915_gpu_error.c | 10 +++++++---
>   1 file changed, 7 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_gpu_error.c b/drivers/gpu/drm/i915/i915_gpu_error.c
> index 0512c66fa4f3..77df899123c2 100644
> --- a/drivers/gpu/drm/i915/i915_gpu_error.c
> +++ b/drivers/gpu/drm/i915/i915_gpu_error.c
> @@ -1116,11 +1116,15 @@ i915_vma_coredump_create(const struct intel_gt *gt,
>   		dma_addr_t dma;
>   
>   		for_each_sgt_daddr(dma, iter, vma_res->bi.pages) {
> +			dma_addr_t offset = dma - mem->region.start;
>   			void __iomem *s;
>   
> -			s = io_mapping_map_wc(&mem->iomap,
> -					      dma - mem->region.start,
> -					      PAGE_SIZE);
> +			if (offset + PAGE_SIZE > mem->io_size) {
> +				ret = -EINVAL;
> +				break;
> +			}
> +
> +			s = io_mapping_map_wc(&mem->iomap, offset, PAGE_SIZE);
>   			ret = compress_page(compress,
>   					    (void __force *)s, dst,
>   					    true);