Adding upstream version 6.6.15.upstream/6.6.15

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 260 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_phys.c b/drivers/gpu/drm/i915/gem/i915_gem_phys.c
new file mode 100644
index 0000000000..76efe98eaa
--- /dev/null
+++ b/drivers/gpu/drm/i915/gem/i915_gem_phys.c
@@ -0,0 +1,260 @@
+/*
+ * SPDX-License-Identifier: MIT
+ *
+ * Copyright © 2014-2016 Intel Corporation
+ */
+
+#include <linux/highmem.h>
+#include <linux/shmem_fs.h>
+#include <linux/swap.h>
+
+#include <drm/drm_cache.h>
+
+#include "gt/intel_gt.h"
+#include "i915_drv.h"
+#include "i915_gem_object.h"
+#include "i915_gem_region.h"
+#include "i915_gem_tiling.h"
+#include "i915_scatterlist.h"
+
+static int i915_gem_object_get_pages_phys(struct drm_i915_gem_object *obj)
+{
+	struct address_space *mapping = obj->base.filp->f_mapping;
+	struct drm_i915_private *i915 = to_i915(obj->base.dev);
+	struct scatterlist *sg;
+	struct sg_table *st;
+	dma_addr_t dma;
+	void *vaddr;
+	void *dst;
+	int i;
+
+	/* Contiguous chunk, with a single scatterlist element */
+	if (overflows_type(obj->base.size, sg->length))
+		return -E2BIG;
+
+	if (GEM_WARN_ON(i915_gem_object_needs_bit17_swizzle(obj)))
+		return -EINVAL;
+
+	/*
+	 * Always aligning to the object size, allows a single allocation
+	 * to handle all possible callers, and given typical object sizes,
+	 * the alignment of the buddy allocation will naturally match.
+	 */
+	vaddr = dma_alloc_coherent(obj->base.dev->dev,
+				   roundup_pow_of_two(obj->base.size),
+				   &dma, GFP_KERNEL);
+	if (!vaddr)
+		return -ENOMEM;
+
+	st = kmalloc(sizeof(*st), GFP_KERNEL);
+	if (!st)
+		goto err_pci;
+
+	if (sg_alloc_table(st, 1, GFP_KERNEL))
+		goto err_st;
+
+	sg = st->sgl;
+	sg->offset = 0;
+	sg->length = obj->base.size;
+
+	sg_assign_page(sg, (struct page *)vaddr);
+	sg_dma_address(sg) = dma;
+	sg_dma_len(sg) = obj->base.size;
+
+	dst = vaddr;
+	for (i = 0; i < obj->base.size / PAGE_SIZE; i++) {
+		struct page *page;
+		void *src;
+
+		page = shmem_read_mapping_page(mapping, i);
+		if (IS_ERR(page))
+			goto err_st;
+
+		src = kmap_atomic(page);
+		memcpy(dst, src, PAGE_SIZE);
+		drm_clflush_virt_range(dst, PAGE_SIZE);
+		kunmap_atomic(src);
+
+		put_page(page);
+		dst += PAGE_SIZE;
+	}
+
+	intel_gt_chipset_flush(to_gt(i915));
+
+	/* We're no longer struct page backed */
+	obj->mem_flags &= ~I915_BO_FLAG_STRUCT_PAGE;
+	__i915_gem_object_set_pages(obj, st);
+
+	return 0;
+
+err_st:
+	kfree(st);
+err_pci:
+	dma_free_coherent(obj->base.dev->dev,
+			  roundup_pow_of_two(obj->base.size),
+			  vaddr, dma);
+	return -ENOMEM;
+}
+
+void
+i915_gem_object_put_pages_phys(struct drm_i915_gem_object *obj,
+			       struct sg_table *pages)
+{
+	dma_addr_t dma = sg_dma_address(pages->sgl);
+	void *vaddr = sg_page(pages->sgl);
+
+	__i915_gem_object_release_shmem(obj, pages, false);
+
+	if (obj->mm.dirty) {
+		struct address_space *mapping = obj->base.filp->f_mapping;
+		void *src = vaddr;
+		int i;
+
+		for (i = 0; i < obj->base.size / PAGE_SIZE; i++) {
+			struct page *page;
+			char *dst;
+
+			page = shmem_read_mapping_page(mapping, i);
+			if (IS_ERR(page))
+				continue;
+
+			dst = kmap_atomic(page);
+			drm_clflush_virt_range(src, PAGE_SIZE);
+			memcpy(dst, src, PAGE_SIZE);
+			kunmap_atomic(dst);
+
+			set_page_dirty(page);
+			if (obj->mm.madv == I915_MADV_WILLNEED)
+				mark_page_accessed(page);
+			put_page(page);
+
+			src += PAGE_SIZE;
+		}
+		obj->mm.dirty = false;
+	}
+
+	sg_free_table(pages);
+	kfree(pages);
+
+	dma_free_coherent(obj->base.dev->dev,
+			  roundup_pow_of_two(obj->base.size),
+			  vaddr, dma);
+}
+
+int i915_gem_object_pwrite_phys(struct drm_i915_gem_object *obj,
+				const struct drm_i915_gem_pwrite *args)
+{
+	void *vaddr = sg_page(obj->mm.pages->sgl) + args->offset;
+	char __user *user_data = u64_to_user_ptr(args->data_ptr);
+	struct drm_i915_private *i915 = to_i915(obj->base.dev);
+	int err;
+
+	err = i915_gem_object_wait(obj,
+				   I915_WAIT_INTERRUPTIBLE |
+				   I915_WAIT_ALL,
+				   MAX_SCHEDULE_TIMEOUT);
+	if (err)
+		return err;
+
+	/*
+	 * We manually control the domain here and pretend that it
+	 * remains coherent i.e. in the GTT domain, like shmem_pwrite.
+	 */
+	i915_gem_object_invalidate_frontbuffer(obj, ORIGIN_CPU);
+
+	if (copy_from_user(vaddr, user_data, args->size))
+		return -EFAULT;
+
+	drm_clflush_virt_range(vaddr, args->size);
+	intel_gt_chipset_flush(to_gt(i915));
+
+	i915_gem_object_flush_frontbuffer(obj, ORIGIN_CPU);
+	return 0;
+}
+
+int i915_gem_object_pread_phys(struct drm_i915_gem_object *obj,
+			       const struct drm_i915_gem_pread *args)
+{
+	void *vaddr = sg_page(obj->mm.pages->sgl) + args->offset;
+	char __user *user_data = u64_to_user_ptr(args->data_ptr);
+	int err;
+
+	err = i915_gem_object_wait(obj,
+				   I915_WAIT_INTERRUPTIBLE,
+				   MAX_SCHEDULE_TIMEOUT);
+	if (err)
+		return err;
+
+	drm_clflush_virt_range(vaddr, args->size);
+	if (copy_to_user(user_data, vaddr, args->size))
+		return -EFAULT;
+
+	return 0;
+}
+
+static int i915_gem_object_shmem_to_phys(struct drm_i915_gem_object *obj)
+{
+	struct sg_table *pages;
+	int err;
+
+	pages = __i915_gem_object_unset_pages(obj);
+
+	err = i915_gem_object_get_pages_phys(obj);
+	if (err)
+		goto err_xfer;
+
+	/* Perma-pin (until release) the physical set of pages */
+	__i915_gem_object_pin_pages(obj);
+
+	if (!IS_ERR_OR_NULL(pages))
+		i915_gem_object_put_pages_shmem(obj, pages);
+
+	i915_gem_object_release_memory_region(obj);
+	return 0;
+
+err_xfer:
+	if (!IS_ERR_OR_NULL(pages))
+		__i915_gem_object_set_pages(obj, pages);
+	return err;
+}
+
+int i915_gem_object_attach_phys(struct drm_i915_gem_object *obj, int align)
+{
+	int err;
+
+	assert_object_held(obj);
+
+	if (align > obj->base.size)
+		return -EINVAL;
+
+	if (!i915_gem_object_is_shmem(obj))
+		return -EINVAL;
+
+	if (!i915_gem_object_has_struct_page(obj))
+		return 0;
+
+	err = i915_gem_object_unbind(obj, I915_GEM_OBJECT_UNBIND_ACTIVE);
+	if (err)
+		return err;
+
+	if (obj->mm.madv != I915_MADV_WILLNEED)
+		return -EFAULT;
+
+	if (i915_gem_object_has_tiling_quirk(obj))
+		return -EFAULT;
+
+	if (obj->mm.mapping || i915_gem_object_has_pinned_pages(obj))
+		return -EBUSY;
+
+	if (unlikely(obj->mm.madv != I915_MADV_WILLNEED)) {
+		drm_dbg(obj->base.dev,
+			"Attempting to obtain a purgeable object\n");
+		return -EFAULT;
+	}
+
+	return i915_gem_object_shmem_to_phys(obj);
+}
+
+#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST)
+#include "selftests/i915_gem_phys.c"
+#endif