linux-kernel - [PATCH 2/2] soc: qcom: rmtfs: Optionally map RMTFS to NAV VM

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Message-Id: <20221213170340.456252-2-konrad.dybcio@linaro.org>
Date:   Tue, 13 Dec 2022 18:03:40 +0100
From:   Konrad Dybcio <konrad.dybcio@...aro.org>
To:     linux-arm-msm@...r.kernel.org, andersson@...nel.org,
        agross@...nel.org, krzysztof.kozlowski@...aro.org
Cc:     marijn.suijten@...ainline.org,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
        Loic Poulain <loic.poulain@...aro.org>,
        AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...ainline.org>,
        Stephan Gerhold <stephan@...hold.net>
Subject: [PATCH 2/2] soc: qcom: rmtfs: Optionally map RMTFS to NAV VM

From: Loic Poulain <loic.poulain@...aro.org>

Some SoCs require that RMTFS is also mapped to the NAV VM. Trying to
power on the modem without that results in the whole platform crashing
and forces a hard reboot within about 2 seconds.

Signed-off-by: Loic Poulain <loic.poulain@...aro.org>
[Konrad: reword, make conditional, add a define for NAV VMID]
Signed-off-by: Konrad Dybcio <konrad.dybcio@...aro.org>
---
 drivers/soc/qcom/rmtfs_mem.c | 22 +++++++++++++++-------
 include/linux/qcom_scm.h     |  1 +
 2 files changed, 16 insertions(+), 7 deletions(-)

diff --git a/drivers/soc/qcom/rmtfs_mem.c b/drivers/soc/qcom/rmtfs_mem.c
index 0feaae357821..999f2c5b49b0 100644
--- a/drivers/soc/qcom/rmtfs_mem.c
+++ b/drivers/soc/qcom/rmtfs_mem.c
@@ -171,12 +171,13 @@ static void qcom_rmtfs_mem_release_device(struct device *dev)
 static int qcom_rmtfs_mem_probe(struct platform_device *pdev)
 {
 	struct device_node *node = pdev->dev.of_node;
-	struct qcom_scm_vmperm perms[2];
+	struct qcom_scm_vmperm perms[3];
 	struct reserved_mem *rmem;
 	struct qcom_rmtfs_mem *rmtfs_mem;
+	bool assign_to_nav;
 	u32 client_id;
 	u32 vmid;
-	int ret;
+	int ret, cnt = 0;
 
 	rmem = of_reserved_mem_lookup(node);
 	if (!rmem) {
@@ -191,6 +192,8 @@ static int qcom_rmtfs_mem_probe(struct platform_device *pdev)
 
 	}
 
+	assign_to_nav = of_property_read_bool(node, "qcom,assign-to-nav");
+
 	rmtfs_mem = kzalloc(sizeof(*rmtfs_mem), GFP_KERNEL);
 	if (!rmtfs_mem)
 		return -ENOMEM;
@@ -236,14 +239,19 @@ static int qcom_rmtfs_mem_probe(struct platform_device *pdev)
 			goto remove_cdev;
 		}
 
-		perms[0].vmid = QCOM_SCM_VMID_HLOS;
-		perms[0].perm = QCOM_SCM_PERM_RW;
-		perms[1].vmid = vmid;
-		perms[1].perm = QCOM_SCM_PERM_RW;
+		perms[cnt].vmid = QCOM_SCM_VMID_HLOS;
+		perms[cnt++].perm = QCOM_SCM_PERM_RW;
+		perms[cnt].vmid = vmid;
+		perms[cnt++].perm = QCOM_SCM_PERM_RW;
+
+		if (assign_to_nav) {
+			perms[cnt].vmid = QCOM_SCM_VMID_NAV;
+			perms[cnt++].perm = QCOM_SCM_PERM_RW;
+		}
 
 		rmtfs_mem->perms = BIT(QCOM_SCM_VMID_HLOS);
 		ret = qcom_scm_assign_mem(rmtfs_mem->addr, rmtfs_mem->size,
-					  &rmtfs_mem->perms, perms, 2);
+					  &rmtfs_mem->perms, perms, cnt);
 		if (ret < 0) {
 			dev_err(&pdev->dev, "assign memory failed\n");
 			goto remove_cdev;
diff --git a/include/linux/qcom_scm.h b/include/linux/qcom_scm.h
index f8335644a01a..150b72edb879 100644
--- a/include/linux/qcom_scm.h
+++ b/include/linux/qcom_scm.h
@@ -55,6 +55,7 @@ enum qcom_scm_ice_cipher {
 #define QCOM_SCM_VMID_MSS_MSA    0xF
 #define QCOM_SCM_VMID_WLAN       0x18
 #define QCOM_SCM_VMID_WLAN_CE    0x19
+#define QCOM_SCM_VMID_NAV        0x2B
 #define QCOM_SCM_PERM_READ       0x4
 #define QCOM_SCM_PERM_WRITE      0x2
 #define QCOM_SCM_PERM_EXEC       0x1
-- 
2.39.0