On 7/30/2025 3:41 PM, Rob Herring wrote:

On Tue, Jul 29, 2025 at 05:29:56PM -0700, Oreoluwa Babatunde wrote:

quoted

Restructure the call site for dma_contiguous_early_fixup() to
where the reserved_mem nodes are being parsed from the DT so that
dma_mmu_remap[] is populated before dma_contiguous_remap() is called.

Fixes: 8a6e02d0c00e ("of: reserved_mem: Restructure how the reserved memory regions are processed")
Signed-off-by: Oreoluwa Babatunde <redacted>
Tested-by: William Zhang <william.zhang@broadcom.com>
---
v3: Wrap the call to dma_contiguous_early_fixup() with a check for
    CONFIG_DMA_CMA to fix compile error seen on x86. The __weak function
    definition introduced in v2 was not sufficient to prevent the issue,
    so remove that as well.
    Also add Tested-by tag from William Zhang.

v2: Add a check for the "reusable" property to narrow things down to
    only cma regions.
    Also add __weak function definition for dma_contiguous_early_fixup()
    to avoid compile errors on architectures that do not define the
    function.

 drivers/of/of_reserved_mem.c | 20 ++++++++++++++++----
 kernel/dma/contiguous.c      |  2 --
 2 files changed, 16 insertions(+), 6 deletions(-)

diff --git a/drivers/of/of_reserved_mem.c b/drivers/of/of_reserved_mem.c
index 77016c0cc296..cfffecb91c3a 100644
--- a/drivers/of/of_reserved_mem.c
+++ b/drivers/of/of_reserved_mem.c

@@ -25,6 +25,7 @@
 #include <linux/memblock.h>
 #include <linux/kmemleak.h>
 #include <linux/cma.h>
+#include <linux/dma-map-ops.h>
 
 #include "of_private.h"
 

@@ -175,13 +176,19 @@ static int __init __reserved_mem_reserve_reg(unsigned long node,
 		base = dt_mem_next_cell(dt_root_addr_cells, &prop);
 		size = dt_mem_next_cell(dt_root_size_cells, &prop);
 
-		if (size &&
-		    early_init_dt_reserve_memory(base, size, nomap) == 0)
+		if (size && early_init_dt_reserve_memory(base, size, nomap) == 0) {
+			/* Architecture specific contiguous memory fixup. */
+#ifdef CONFIG_DMA_CMA
+			if (of_flat_dt_is_compatible(node, "shared-dma-pool") &&
+			    of_get_flat_dt_prop(node, "reusable", NULL))
+				dma_contiguous_early_fixup(base, size);
+#endif

Add a static inline for dma_contiguous_early_fixup() instead of having 
an #ifdef.

ACK.

Thanks!