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arm_fpga: Remove SPE PMU DT node if SPE is not available

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The Statistical Profiling Extension (SPE) is an architectural feature we
can safely detect at runtime. However it still relies on one piece of
platform-specific information: the interrupt line it is connected
to. This requires SPE to be described in a devicetree node.

Since SPE support varies with the CPU cores found on an FPGA image, we
should detect the presence of SPE at runtime, and remove a potentially
existing SPE PMU node from the DT.

This allows to always have the SPE node in a generic devicetree file,
without risking exposing it on a CPU without this feature.

Change-Id: I73d83ea8509b03fe7bba20b9cce8d1335035fa31
Signed-off-by: Andre Przywara <andre.przywara@arm.com>
This commit is contained in:
Andre Przywara 2020-08-03 12:55:28 +01:00
parent 283e5595af
commit 40a0de1972
1 changed files with 11 additions and 0 deletions
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11
plat/arm/board/arm_fpga/fpga_bl31_setup.c
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@ -12,6 +12,7 @@
#include <drivers/arm/gicv3.h> #include <drivers/arm/gicv3.h>
#include <drivers/delay_timer.h> #include <drivers/delay_timer.h>
#include <drivers/generic_delay_timer.h> #include <drivers/generic_delay_timer.h>
#include <lib/extensions/spe.h>
#include <libfdt.h> #include <libfdt.h>
#include "fpga_private.h" #include "fpga_private.h"
@ -224,6 +225,16 @@ static void fpga_prepare_dtb(void)
} }
} }
/* Check whether we support the SPE PMU. Remove the DT node if not. */
if (!spe_supported()) {
int node = fdt_node_offset_by_compatible(fdt, 0,
"arm,statistical-profiling-extension-v1");
if (node >= 0) {
fdt_del_node(fdt, node);
}
}
err = fdt_pack(fdt); err = fdt_pack(fdt);
if (err < 0) { if (err < 0) {
ERROR("Failed to pack Device Tree at %p: error %d\n", fdt, err); ERROR("Failed to pack Device Tree at %p: error %d\n", fdt, err);