Copy the pages duing SVM migration using memcpy().
Cc: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>
Cc: Jon Bloomfield <jon.bloomfield@xxxxxxxxx>
Cc: Daniel Vetter <daniel.vetter@xxxxxxxxx>
Cc: Sudeep Dutt <sudeep.dutt@xxxxxxxxx>
Signed-off-by: Niranjana Vishwanathapura <niranjana.vishwanathapura@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_svm_devmem.c | 72 ++++++++++++++++++++++++++
1 file changed, 72 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_svm_devmem.c b/drivers/gpu/drm/i915/i915_svm_devmem.c
index 37a205d3a82f..960b04091e44 100644
--- a/drivers/gpu/drm/i915/i915_svm_devmem.c
+++ b/drivers/gpu/drm/i915/i915_svm_devmem.c
@@ -142,6 +142,69 @@ i915_devmem_page_free_locked(struct drm_i915_private *dev_priv,
put_page(page);
}
+static int i915_migrate_cpu_copy(struct i915_devmem_migrate *migrate)
+{
+ const unsigned long *src = migrate->args->src;
+ unsigned long *dst = migrate->args->dst;
+ struct drm_i915_private *i915 = migrate->i915;
+ struct intel_memory_region *mem;
+ void *src_vaddr, *dst_vaddr;
+ u64 src_addr, dst_addr;
+ struct page *page;
+ int i, ret = 0;
+
+ /* XXX: Copy multiple pages at a time */
+ for (i = 0; !ret && i < migrate->npages; i++) {
+ if (!dst[i])
+ continue;
+
+ page = migrate_pfn_to_page(dst[i]);
+ mem = i915->mm.regions[migrate->dst_id];
+ dst_addr = page_to_pfn(page);
+ if (migrate->dst_id != INTEL_REGION_SMEM)
+ dst_addr -= mem->devmem->pfn_first;
+ dst_addr <<= PAGE_SHIFT;
+
+ if (migrate->dst_id == INTEL_REGION_SMEM)
+ dst_vaddr = phys_to_virt(dst_addr);
+ else
+ dst_vaddr = io_mapping_map_atomic_wc(&mem->iomap,
+ dst_addr);
+ if (unlikely(!dst_vaddr))
+ return -ENOMEM;
+
+ page = migrate_pfn_to_page(src[i]);
+ mem = i915->mm.regions[migrate->src_id];
+ src_addr = page_to_pfn(page);
+ if (migrate->src_id != INTEL_REGION_SMEM)
+ src_addr -= mem->devmem->pfn_first;
+ src_addr <<= PAGE_SHIFT;
+
+ if (migrate->src_id == INTEL_REGION_SMEM)
+ src_vaddr = phys_to_virt(src_addr);
+ else
+ src_vaddr = io_mapping_map_atomic_wc(&mem->iomap,
+ src_addr);
+
+ if (likely(src_vaddr))
+ memcpy(dst_vaddr, src_vaddr, PAGE_SIZE);
+ else
+ ret = -ENOMEM;
+
+ if (migrate->dst_id != INTEL_REGION_SMEM)
+ io_mapping_unmap_atomic(dst_vaddr);
+
+ if (migrate->src_id != INTEL_REGION_SMEM && src_vaddr)
+ io_mapping_unmap_atomic(src_vaddr);
+
+ DRM_DEBUG_DRIVER("src [%d] 0x%llx, dst [%d] 0x%llx\n",
+ migrate->src_id, src_addr,
+ migrate->dst_id, dst_addr);
+ }
+
+ return ret;
+}
+
static int
i915_devmem_migrate_alloc_and_copy(struct i915_devmem_migrate *migrate)
{
@@ -201,6 +264,8 @@ i915_devmem_migrate_alloc_and_copy(struct i915_devmem_migrate *migrate)
/* Copy the pages */
migrate->npages = npages;
+ /* XXX: Flush the caches? */
+ ret = i915_migrate_cpu_copy(migrate);
migrate_out:
if (unlikely(ret)) {
for (i = 0; i < npages; i++) {
@@ -286,6 +351,7 @@ i915_devmem_fault_alloc_and_copy(struct i915_devmem_migrate *migrate)
struct device *dev = migrate->i915->drm.dev;
struct migrate_vma *args = migrate->args;
struct page *dpage, *spage;
+ int err;
DRM_DEBUG_DRIVER("start 0x%lx\n", args->start);
/* Allocate host page */
@@ -302,6 +368,12 @@ i915_devmem_fault_alloc_and_copy(struct i915_devmem_migrate *migrate)
/* Copy the pages */
migrate->npages = 1;
+ err = i915_migrate_cpu_copy(migrate);
+ if (unlikely(err)) {
+ __free_page(dpage);
+ args->dst[0] = 0;
+ return VM_FAULT_SIGBUS;
+ }
return 0;
}
--
2.21.0.rc0.32.g243a4c7e27
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