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50 lines
1.8 KiB
Diff
50 lines
1.8 KiB
Diff
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From cf40e83d2b6fb6857b13df4c8d69cc4c45395ea2 Mon Sep 17 00:00:00 2001
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From: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
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Date: Fri, 10 Jan 2020 18:19:33 +0100
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Subject: [PATCH] dma-contiguous: CMA: give precedence to cmdline
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commit 8c8c5a4994a306c217fd061cbfc5903399fd4c1c upstream.
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Although the device tree might contain a reserved-memory DT node
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dedicated as the default CMA pool, users might want to change CMA's
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parameters using the kernel command line for debugging purposes and
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whatnot. Honor this by bypassing the reserved memory CMA setup, which
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will ultimately end up freeing the memblock and allow the command line
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CMA configuration routine to run.
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Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
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Reviewed-by: Phil Elwell <phil@raspberrypi.org>
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Signed-off-by: Christoph Hellwig <hch@lst.de>
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---
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kernel/dma/contiguous.c | 9 ++++++++-
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1 file changed, 8 insertions(+), 1 deletion(-)
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--- a/kernel/dma/contiguous.c
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+++ b/kernel/dma/contiguous.c
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@@ -301,9 +301,16 @@ static int __init rmem_cma_setup(struct
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phys_addr_t align = PAGE_SIZE << max(MAX_ORDER - 1, pageblock_order);
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phys_addr_t mask = align - 1;
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unsigned long node = rmem->fdt_node;
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+ bool default_cma = of_get_flat_dt_prop(node, "linux,cma-default", NULL);
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struct cma *cma;
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int err;
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+ if (size_cmdline != -1 && default_cma) {
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+ pr_info("Reserved memory: bypass %s node, using cmdline CMA params instead\n",
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+ rmem->name);
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+ return -EBUSY;
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+ }
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+
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if (!of_get_flat_dt_prop(node, "reusable", NULL) ||
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of_get_flat_dt_prop(node, "no-map", NULL))
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return -EINVAL;
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@@ -321,7 +328,7 @@ static int __init rmem_cma_setup(struct
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/* Architecture specific contiguous memory fixup. */
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dma_contiguous_early_fixup(rmem->base, rmem->size);
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- if (of_get_flat_dt_prop(node, "linux,cma-default", NULL))
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+ if (default_cma)
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dma_contiguous_set_default(cma);
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rmem->ops = &rmem_cma_ops;
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