Mesa (main): anv: Fix FlushMappedMemoryRanges for odd mmap offsets

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Module: Mesa
Branch: main
Commit: 90ac06e5029b9f0c702c92e97696c9cdb97b08d6
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=90ac06e5029b9f0c702c92e97696c9cdb97b08d6

Author: Jason Ekstrand <jason at jlekstrand.net>
Date:   Sat Oct 30 16:57:02 2021 -0500

anv: Fix FlushMappedMemoryRanges for odd mmap offsets

When the client calls vkMapMemory(), we have to align the requested
offset down to the nearest page or else the map will fail.  On platforms
where we have DRM_IOCTL_I915_GEM_MMAP_OFFSET, we always map the whole
buffer.  In either case, the original map may start before the requested
offset and we need to take that into account when we clflush.

Cc: mesa-stable at lists.freedesktop.org
Reviewed-by: Paulo Zanoni <paulo.r.zanoni at intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/13610>

---

 src/intel/vulkan/anv_device.c  | 11 +++++++----
 src/intel/vulkan/anv_private.h |  3 +++
 2 files changed, 10 insertions(+), 4 deletions(-)

diff --git a/src/intel/vulkan/anv_device.c b/src/intel/vulkan/anv_device.c
index 8d8530646ef..32fb9d65df4 100644
--- a/src/intel/vulkan/anv_device.c
+++ b/src/intel/vulkan/anv_device.c
@@ -4073,8 +4073,9 @@ VkResult anv_MapMemory(
 
    mem->map = map;
    mem->map_size = map_size;
+   mem->map_delta = (offset - map_offset);
 
-   *ppData = mem->map + (offset - map_offset);
+   *ppData = mem->map + mem->map_delta;
 
    return VK_SUCCESS;
 }
@@ -4093,6 +4094,7 @@ void anv_UnmapMemory(
 
    mem->map = NULL;
    mem->map_size = 0;
+   mem->map_delta = 0;
 }
 
 static void
@@ -4102,14 +4104,15 @@ clflush_mapped_ranges(struct anv_device         *device,
 {
    for (uint32_t i = 0; i < count; i++) {
       ANV_FROM_HANDLE(anv_device_memory, mem, ranges[i].memory);
-      if (ranges[i].offset >= mem->map_size)
+      uint64_t map_offset = ranges[i].offset + mem->map_delta;
+      if (map_offset >= mem->map_size)
          continue;
 
       if (mem->type->propertyFlags & VK_MEMORY_PROPERTY_HOST_COHERENT_BIT)
          continue;
 
-      intel_clflush_range(mem->map + ranges[i].offset,
-                        MIN2(ranges[i].size, mem->map_size - ranges[i].offset));
+      intel_clflush_range(mem->map + map_offset,
+                          MIN2(ranges[i].size, mem->map_size - map_offset));
    }
 }
 
diff --git a/src/intel/vulkan/anv_private.h b/src/intel/vulkan/anv_private.h
index 3fdbfce1c8d..b02f9545ef3 100644
--- a/src/intel/vulkan/anv_private.h
+++ b/src/intel/vulkan/anv_private.h
@@ -1777,6 +1777,9 @@ struct anv_device_memory {
    VkDeviceSize                                 map_size;
    void *                                       map;
 
+   /* The map, from the user PoV is map + map_delta */
+   uint32_t                                     map_delta;
+
    /* If set, we are holding reference to AHardwareBuffer
     * which we must release when memory is freed.
     */