[PATCH v5 05/15] firmware: qcom: scm: enable the TZ mem allocator

Bartosz Golaszewski
2023-10-17T09:28:07Z

Select the TrustZone memory allocator in Kconfig and create a pool of
memory shareable with the TrustZone when probing the SCM driver.

This will allow a gradual conversion of all relevant SCM calls to using
the dedicated allocator.

Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Reviewed-by: Andrew Halaney <ahalaney@redhat.com>
Tested-by: Andrew Halaney <ahalaney@redhat.com> # sc8280xp-lenovo-thinkpad-x13s
---
drivers/firmware/qcom/Kconfig | 1 +
drivers/firmware/qcom/qcom_scm.c | 16 ++++++++++++++++
2 files changed, 17 insertions(+)

diff --git a/drivers/firmware/qcom/Kconfig b/drivers/firmware/qcom/Kconfig
index b80269a28224..237da40de832 100644
--- a/drivers/firmware/qcom/Kconfig
+++ b/drivers/firmware/qcom/Kconfig
@@ -7,6 +7,7 @@
menu "Qualcomm firmware drivers"

config QCOM_SCM
+ select QCOM_TZMEM
tristate

config QCOM_TZMEM
diff --git a/drivers/firmware/qcom/qcom_scm.c b/drivers/firmware/qcom/qcom_scm.c
index 520de9b5633a..0d4c028be0c1 100644
--- a/drivers/firmware/qcom/qcom_scm.c
+++ b/drivers/firmware/qcom/qcom_scm.c
@@ -8,8 +8,10 @@
#include <linux/completion.h>
#include <linux/cpumask.h>
#include <linux/dma-mapping.h>
+#include <linux/err.h>
#include <linux/export.h>
#include <linux/firmware/qcom/qcom_scm.h>
+#include <linux/firmware/qcom/qcom_tzmem.h>
#include <linux/init.h>
#include <linux/interconnect.h>
#include <linux/interrupt.h>
@@ -20,9 +22,11 @@
#include <linux/of_platform.h>
#include <linux/platform_device.h>
#include <linux/reset-controller.h>
+#include <linux/sizes.h>
#include <linux/types.h>

#include "qcom_scm.h"
+#include "qcom_tzmem.h"

static bool download_mode = IS_ENABLED(CONFIG_QCOM_SCM_DOWNLOAD_MODE_DEFAULT);
module_param(download_mode, bool, 0);
@@ -41,6 +45,8 @@ struct qcom_scm {
int scm_vote_count;

u64 dload_mode_addr;
+
+ struct qcom_tzmem_pool *mempool;
};

struct qcom_scm_current_perm_info {
@@ -1887,6 +1893,16 @@ static int qcom_scm_probe(struct platform_device *pdev)
if (of_property_read_bool(pdev->dev.of_node, "qcom,sdi-enabled"))
qcom_scm_disable_sdi();

+ ret = qcom_tzmem_enable(__scm->dev);
+ if (ret)
+ return dev_err_probe(__scm->dev, ret,
+ "Failed to enable the TrustZone memory allocator\n");
+
+ __scm->mempool = devm_qcom_tzmem_pool_new(__scm->dev, SZ_256K);
+ if (IS_ERR(__scm->mempool))
+ return dev_err_probe(__scm->dev, PTR_ERR(__scm->mempool),
+ "Failed to create the SCM memory pool\n");
+
/*
* Initialize the QSEECOM interface.
*
--
2.39.2