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soc: qcom: rmtfs-mem: Add support for assigning memory to remote

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On some platform the remote processor's memory map is not statically
configured in TrustZone, so each memory region that is to be accessed by
the remote needs a call into TrustZone to set up the remote's
permissions.

Implement this for the rmtfs memory driver, to give the modem on 8996
access to the shared file system buffers.

Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Signed-off-by: Andy Gross <andy.gross@linaro.org>
This commit is contained in:
Bjorn Andersson 2018-02-12 17:37:23 -08:00 committed by Andy Gross
parent 7928b2cbe5
commit fa65f80451
2 changed files with 35 additions and 0 deletions
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1
drivers/soc/qcom/Kconfig
View File

@ -47,6 +47,7 @@ config QCOM_QMI_HELPERS
config QCOM_RMTFS_MEM
tristate "Qualcomm Remote Filesystem memory driver"
depends on ARCH_QCOM
select QCOM_SCM
help
The Qualcomm remote filesystem memory driver is used for allocating
and exposing regions of shared memory with remote processors for the

34
drivers/soc/qcom/rmtfs_mem.c
View File

@ -37,6 +37,8 @@ struct qcom_rmtfs_mem {
phys_addr_t size;
unsigned int client_id;
unsigned int perms;
};
static ssize_t qcom_rmtfs_mem_show(struct device *dev,
@ -151,9 +153,11 @@ 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 reserved_mem *rmem;
struct qcom_rmtfs_mem *rmtfs_mem;
u32 client_id;
u32 vmid;
int ret;
rmem = of_reserved_mem_lookup(node);
@ -204,10 +208,31 @@ static int qcom_rmtfs_mem_probe(struct platform_device *pdev)
rmtfs_mem->dev.release = qcom_rmtfs_mem_release_device;
ret = of_property_read_u32(node, "qcom,vmid", &vmid);
if (ret < 0 && ret != -EINVAL) {
dev_err(&pdev->dev, "failed to parse qcom,vmid\n");
goto remove_cdev;
} else if (!ret) {
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;
rmtfs_mem->perms = BIT(QCOM_SCM_VMID_HLOS);
ret = qcom_scm_assign_mem(rmtfs_mem->addr, rmtfs_mem->size,
&rmtfs_mem->perms, perms, 2);
if (ret < 0) {
dev_err(&pdev->dev, "assign memory failed\n");
goto remove_cdev;
}
}
dev_set_drvdata(&pdev->dev, rmtfs_mem);
return 0;
remove_cdev:
cdev_device_del(&rmtfs_mem->cdev, &rmtfs_mem->dev);
put_device:
put_device(&rmtfs_mem->dev);
@ -217,6 +242,15 @@ put_device:
static int qcom_rmtfs_mem_remove(struct platform_device *pdev)
{
struct qcom_rmtfs_mem *rmtfs_mem = dev_get_drvdata(&pdev->dev);
struct qcom_scm_vmperm perm;
if (rmtfs_mem->perms) {
perm.vmid = QCOM_SCM_VMID_HLOS;
perm.perm = QCOM_SCM_PERM_RW;
qcom_scm_assign_mem(rmtfs_mem->addr, rmtfs_mem->size,
&rmtfs_mem->perms, &perm, 1);
}
cdev_device_del(&rmtfs_mem->cdev, &rmtfs_mem->dev);
put_device(&rmtfs_mem->dev);