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Date: Mon, 12 Sep 2022 11:41:31 -0700
From: Gokul krishna Krishnakumar <quic_gokukris@...cinc.com>
To: Andy Gross <agross@...nel.org>,
Bjorn Andersson <andersson@...nel.org>,
Konrad Dybcio <konrad.dybcio@...ainline.org>,
Philipp Zabel <p.zabel@...gutronix.de>
CC: <linux-arm-msm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
"Trilok Soni" <quic_tsoni@...cinc.com>,
Satya Durga Srinivasu Prabhala <quic_satyap@...cinc.com>,
Rajendra Nayak <quic_rjendra@...cinc.com>,
"Elliot Berman" <quic_eberman@...cinc.com>,
Guru Das Srinagesh <quic_gurus@...cinc.com>,
Gokul krishna Krishnakumar <quic_gokukris@...cinc.com>
Subject: [PATCH v1 1/2] firmware: qcom_scm: Remove memory alloc call from qcom_scm_pas_init_image()
The memory for metadata is allocated in mdt loader and scm driver
1]. 163 data = kmalloc(ehdr_size + hash_size, GFP_KERNEL);
2]. 477 mdata_buf = dma_alloc_coherent(__scm->dev, size, &mdata_phys,
478 GFP_KERNEL);
The SCM driver is meant to only pack arguments provided to it from clients
for making the secure world calls. This change removes the logic of doing
a dma alloc coherent from the SCM driver and moves it into the mdt loader
Signed-off-by: Gokul krishna Krishnakumar <quic_gokukris@...cinc.com>
---
drivers/firmware/qcom_scm.c | 33 +++------------------------------
drivers/soc/qcom/mdt_loader.c | 3 ++-
include/linux/qcom_scm.h | 4 +---
3 files changed, 6 insertions(+), 34 deletions(-)
diff --git a/drivers/firmware/qcom_scm.c b/drivers/firmware/qcom_scm.c
index cdbfe54..05ec03c 100644
--- a/drivers/firmware/qcom_scm.c
+++ b/drivers/firmware/qcom_scm.c
@@ -442,11 +442,9 @@ static void qcom_scm_set_download_mode(bool enable)
* state machine for a given peripheral, using the
* metadata
* @peripheral: peripheral id
- * @metadata: pointer to memory containing ELF header, program header table
+ * @mdata_phys: pointer to memory containing ELF header, program header table
* and optional blob of data used for authenticating the metadata
* and the rest of the firmware
- * @size: size of the metadata
- * @ctx: optional metadata context
*
* Return: 0 on success.
*
@@ -454,11 +452,8 @@ static void qcom_scm_set_download_mode(bool enable)
* track the metadata allocation, this needs to be released by invoking
* qcom_scm_pas_metadata_release() by the caller.
*/
-int qcom_scm_pas_init_image(u32 peripheral, const void *metadata, size_t size,
- struct qcom_scm_pas_metadata *ctx)
+int qcom_scm_pas_init_image(u32 peripheral, dma_addr_t mdata_phys)
{
- dma_addr_t mdata_phys;
- void *mdata_buf;
int ret;
struct qcom_scm_desc desc = {
.svc = QCOM_SCM_SVC_PIL,
@@ -469,22 +464,9 @@ int qcom_scm_pas_init_image(u32 peripheral, const void *metadata, size_t size,
};
struct qcom_scm_res res;
- /*
- * During the scm call memory protection will be enabled for the meta
- * data blob, so make sure it's physically contiguous, 4K aligned and
- * non-cachable to avoid XPU violations.
- */
- mdata_buf = dma_alloc_coherent(__scm->dev, size, &mdata_phys,
- GFP_KERNEL);
- if (!mdata_buf) {
- dev_err(__scm->dev, "Allocation of metadata buffer failed.\n");
- return -ENOMEM;
- }
- memcpy(mdata_buf, metadata, size);
-
ret = qcom_scm_clk_enable();
if (ret)
- goto out;
+ return ret;
ret = qcom_scm_bw_enable();
if (ret)
@@ -497,15 +479,6 @@ int qcom_scm_pas_init_image(u32 peripheral, const void *metadata, size_t size,
qcom_scm_bw_disable();
qcom_scm_clk_disable();
-out:
- if (ret < 0 || !ctx) {
- dma_free_coherent(__scm->dev, size, mdata_buf, mdata_phys);
- } else if (ctx) {
- ctx->ptr = mdata_buf;
- ctx->phys = mdata_phys;
- ctx->size = size;
- }
-
return ret ? : res.result[0];
}
EXPORT_SYMBOL(qcom_scm_pas_init_image);
diff --git a/drivers/soc/qcom/mdt_loader.c b/drivers/soc/qcom/mdt_loader.c
index 3f11554..8d06125 100644
--- a/drivers/soc/qcom/mdt_loader.c
+++ b/drivers/soc/qcom/mdt_loader.c
@@ -210,6 +210,7 @@ int qcom_mdt_pas_init(struct device *dev, const struct firmware *fw,
const struct elf32_hdr *ehdr;
phys_addr_t min_addr = PHYS_ADDR_MAX;
phys_addr_t max_addr = 0;
+ dma_addr_t mdata_phys;
size_t metadata_len;
void *metadata;
int ret;
@@ -238,7 +239,7 @@ int qcom_mdt_pas_init(struct device *dev, const struct firmware *fw,
goto out;
}
- ret = qcom_scm_pas_init_image(pas_id, metadata, metadata_len, ctx);
+ ret = qcom_scm_pas_init_image(pas_id, mdata_phys);
kfree(metadata);
if (ret) {
/* Invalid firmware metadata */
diff --git a/include/linux/qcom_scm.h b/include/linux/qcom_scm.h
index f833564..751436a 100644
--- a/include/linux/qcom_scm.h
+++ b/include/linux/qcom_scm.h
@@ -74,9 +74,7 @@ struct qcom_scm_pas_metadata {
ssize_t size;
};
-extern int qcom_scm_pas_init_image(u32 peripheral, const void *metadata,
- size_t size,
- struct qcom_scm_pas_metadata *ctx);
+extern int qcom_scm_pas_init_image(u32 peripheral, dma_addr_t metadata);
void qcom_scm_pas_metadata_release(struct qcom_scm_pas_metadata *ctx);
extern int qcom_scm_pas_mem_setup(u32 peripheral, phys_addr_t addr,
phys_addr_t size);
--
2.7.4
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