From: Sibi Sankar <quic_sibis@xxxxxxxxxxx>
[ Upstream commit 57f72170a2b2a362c35bb9407fc844eac5afdec1 ]
Any access to the dynamically allocated metadata region by the application
processor after assigning it to the remote Q6 will result in a XPU
violation. Fix this by replacing the dynamically allocated memory region
with a no-map carveout and unmap the modem metadata memory region before
passing control to the remote Q6.
Reported-and-tested-by: Amit Pundir <amit.pundir@xxxxxxxxxx>
Fixes: 6c5a9dc2481b ("remoteproc: qcom: Make secure world call for mem ownership switch")
Signed-off-by: Sibi Sankar <quic_sibis@xxxxxxxxxxx>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxx>
Signed-off-by: Bjorn Andersson <andersson@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20230117085840.32356-7-quic_sibis@xxxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/remoteproc/qcom_q6v5_mss.c | 59 +++++++++++++++++++++++++++---
1 file changed, 53 insertions(+), 6 deletions(-)
diff --git a/drivers/remoteproc/qcom_q6v5_mss.c b/drivers/remoteproc/qcom_q6v5_mss.c
index 5e54e6f5edb1a..49faa90da93f6 100644
--- a/drivers/remoteproc/qcom_q6v5_mss.c
+++ b/drivers/remoteproc/qcom_q6v5_mss.c
@@ -16,6 +16,7 @@
#include <linux/module.h>
#include <linux/of_address.h>
#include <linux/of_device.h>
+#include <linux/of_reserved_mem.h>
#include <linux/platform_device.h>
#include <linux/pm_domain.h>
#include <linux/pm_runtime.h>
@@ -175,6 +176,9 @@ struct q6v5 {
void *mba_region;
size_t mba_size;
+ phys_addr_t mdata_phys;
+ size_t mdata_size;
+
phys_addr_t mpss_phys;
phys_addr_t mpss_reloc;
void *mpss_region;
@@ -679,15 +683,35 @@ static int q6v5_mpss_init_image(struct q6v5 *qproc, const struct firmware *fw)
if (IS_ERR(metadata))
return PTR_ERR(metadata);
- ptr = dma_alloc_attrs(qproc->dev, size, &phys, GFP_KERNEL, dma_attrs);
- if (!ptr) {
- kfree(metadata);
- dev_err(qproc->dev, "failed to allocate mdt buffer\n");
- return -ENOMEM;
+ if (qproc->mdata_phys) {
+ if (size > qproc->mdata_size) {
+ ret = -EINVAL;
+ dev_err(qproc->dev, "metadata size outside memory range\n");
+ goto free_metadata;
+ }
+
+ phys = qproc->mdata_phys;
+ ptr = memremap(qproc->mdata_phys, size, MEMREMAP_WC);
+ if (!ptr) {
+ ret = -EBUSY;
+ dev_err(qproc->dev, "unable to map memory region: %pa+%zx\n",
+ &qproc->mdata_phys, size);
+ goto free_metadata;
+ }
+ } else {
+ ptr = dma_alloc_attrs(qproc->dev, size, &phys, GFP_KERNEL, dma_attrs);
+ if (!ptr) {
+ ret = -ENOMEM;
+ dev_err(qproc->dev, "failed to allocate mdt buffer\n");
+ goto free_metadata;
+ }
}
memcpy(ptr, metadata, size);
+ if (qproc->mdata_phys)
+ memunmap(ptr);
+
/* Hypervisor mapping to access metadata by modem */
mdata_perm = BIT(QCOM_SCM_VMID_HLOS);
ret = q6v5_xfer_mem_ownership(qproc, &mdata_perm, true, phys, size);
@@ -714,7 +738,9 @@ static int q6v5_mpss_init_image(struct q6v5 *qproc, const struct firmware *fw)
"mdt buffer not reclaimed system may become unstable\n");
free_dma_attrs:
- dma_free_attrs(qproc->dev, size, ptr, phys, dma_attrs);
+ if (!qproc->mdata_phys)
+ dma_free_attrs(qproc->dev, size, ptr, phys, dma_attrs);
+free_metadata:
kfree(metadata);
return ret < 0 ? ret : 0;
@@ -1383,6 +1409,7 @@ static int q6v5_init_reset(struct q6v5 *qproc)
static int q6v5_alloc_memory_region(struct q6v5 *qproc)
{
struct device_node *child;
+ struct reserved_mem *rmem;
struct device_node *node;
struct resource r;
int ret;
@@ -1417,6 +1444,26 @@ static int q6v5_alloc_memory_region(struct q6v5 *qproc)
qproc->mpss_phys = qproc->mpss_reloc = r.start;
qproc->mpss_size = resource_size(&r);
+ if (!child) {
+ node = of_parse_phandle(qproc->dev->of_node, "memory-region", 2);
+ } else {
+ child = of_get_child_by_name(qproc->dev->of_node, "metadata");
+ node = of_parse_phandle(child, "memory-region", 0);
+ of_node_put(child);
+ }
+
+ if (!node)
+ return 0;
+
+ rmem = of_reserved_mem_lookup(node);
+ if (!rmem) {
+ dev_err(qproc->dev, "unable to resolve metadata region\n");
+ return -EINVAL;
+ }
+
+ qproc->mdata_phys = rmem->base;
+ qproc->mdata_size = rmem->size;
+
return 0;
}
--
2.39.2
