linux (Samsung): drop unused code for 6.12

code is unused and no longer applies since 6.12-rc1
- bb0e391975

projects/Samsung/patches/linux/samsung-0008-WIP-ARM-dma-mapping-implement-alloc_noncontiguous.patch

@@ -1,93 +0,0 @@
-From a3760f539508e81d47b21321aa42a09ce96555d3 Mon Sep 17 00:00:00 2001
-From: Pavel Golikov <Paullo612@ya.ru>
-Date: Fri, 24 Jun 2022 15:52:58 +0000
-Subject: [PATCH 08/21] WIP: ARM/dma-mapping: implement ->alloc_noncontiguous
-
-Implement support for allocating a non-contiguous DMA region. The
-implementation is based on the ma-iommu driver.
-
-Signed-off-by: Pavel Golikov <Paullo612@ya.ru>
----
- arch/arm/mm/dma-mapping.c | 59 +++++++++++++++++++++++++++++++++++++++
- 1 file changed, 59 insertions(+)
-
-diff --git a/arch/arm/mm/dma-mapping.c b/arch/arm/mm/dma-mapping.c
-index 059cce018570..8f867cb9fe75 100644
---- a/arch/arm/mm/dma-mapping.c
-+++ b/arch/arm/mm/dma-mapping.c
-@@ -1759,6 +1759,63 @@ static void arm_iommu_unmap_sg(struct device *dev,
- 	}
- }
- 
-+static struct sg_table *arm_iommu_alloc_noncontiguous(struct device *dev,
-+		size_t size, enum dma_data_direction dir, gfp_t gfp,
-+		unsigned long attrs)
-+{
-+	struct dma_sgt_handle *sh;
-+	int count;
-+
-+	sh = kmalloc(sizeof(*sh), gfp);
-+	if (!sh)
-+		return NULL;
-+
-+	size = PAGE_ALIGN(size);
-+	count = size >> PAGE_SHIFT;
-+
-+	/*
-+	 * Following is a work-around (a.k.a. hack) to prevent pages
-+	 * with __GFP_COMP being passed to split_page() which cannot
-+	 * handle them.  The real problem is that this flag probably
-+	 * should be 0 on ARM as it is not supported on this
-+	 * platform; see CONFIG_HUGETLBFS.
-+	 */
-+	gfp &= ~(__GFP_COMP);
-+
-+	sh->pages = __iommu_alloc_buffer(dev, size, gfp, attrs, false);
-+	if (!sh->pages)
-+		goto err_sh;
-+
-+	if (sg_alloc_table_from_pages(&sh->sgt, sh->pages, count, 0, size,
-+	    GFP_KERNEL))
-+		goto err_buffer;
-+
-+	if (arm_iommu_map_sg(dev, sh->sgt.sgl, sh->sgt.orig_nents, dir, attrs
-+	    ) < 1)
-+		goto err_free_sg;
-+
-+	return &sh->sgt;
-+
-+err_free_sg:
-+	sg_free_table(&sh->sgt);
-+err_buffer:
-+	__iommu_free_buffer(dev, sh->pages, size, attrs);
-+err_sh:
-+	kfree(sh);
-+	return NULL;
-+}
-+
-+static void arm_iommu_free_noncontiguous(struct device *dev, size_t size,
-+			struct sg_table *sgt, enum dma_data_direction dir)
-+{
-+	struct dma_sgt_handle *sh = sgt_handle(sgt);
-+
-+	arm_iommu_unmap_sg(dev, sgt->sgl, sgt->orig_nents, dir, 0);
-+	__iommu_free_buffer(dev, sh->pages, PAGE_ALIGN(size), 0);
-+	sg_free_table(&sh->sgt);
-+	kfree(sh);
-+}
-+
- /**
-  * arm_iommu_sync_sg_for_cpu
-  * @dev: valid struct device pointer
-@@ -1996,6 +2053,8 @@ static const struct dma_map_ops iommu_ops = {
- 
- 	.map_page		= arm_iommu_map_page,
- 	.unmap_page		= arm_iommu_unmap_page,
-+	.alloc_noncontiguous    = arm_iommu_alloc_noncontiguous,
-+	.free_noncontiguous    = arm_iommu_free_noncontiguous,
- 	.sync_single_for_cpu	= arm_iommu_sync_single_for_cpu,
- 	.sync_single_for_device	= arm_iommu_sync_single_for_device,
- 
--- 
-2.17.1
-