On 1/11/2023 2:25 AM, Kalle Valo wrote:
From: Kalle Valo <quic_kvalo@xxxxxxxxxxx>
Currently MHI loads the firmware image from the path provided by client
devices. ath11k needs to support firmware image embedded along with meta data
(named as firmware-2.bin). So allow the client driver to request the firmware
file from user space on it's own and provide the firmware image data and size
to MHI via a pointer struct mhi_controller::fw_data.
This is an optional feature, if fw_data is NULL MHI load the firmware using the
name from struct mhi_controller::fw_image string as before.
Tested with ath11k and WCN6855 hw2.0.
Signed-off-by: Kalle Valo <quic_kvalo@xxxxxxxxxxx>
---
drivers/bus/mhi/host/boot.c | 27 +++++++++++++++++++--------
include/linux/mhi.h | 6 ++++++
2 files changed, 25 insertions(+), 8 deletions(-)
diff --git a/drivers/bus/mhi/host/boot.c b/drivers/bus/mhi/host/boot.c
index 1c69feee1703..d6d5f424491e 100644
--- a/drivers/bus/mhi/host/boot.c
+++ b/drivers/bus/mhi/host/boot.c
@@ -365,12 +365,10 @@ int mhi_alloc_bhie_table(struct mhi_controller *mhi_cntrl,
}
static void mhi_firmware_copy(struct mhi_controller *mhi_cntrl,
- const struct firmware *firmware,
+ const u8 *buf, size_t remainder,
struct image_info *img_info)
{
- size_t remainder = firmware->size;
size_t to_cpy;
- const u8 *buf = firmware->data;
struct mhi_buf *mhi_buf = img_info->mhi_buf;
struct bhi_vec_entry *bhi_vec = img_info->bhi_vec;
@@ -392,9 +390,10 @@ void mhi_fw_load_handler(struct mhi_controller *mhi_cntrl)
const struct firmware *firmware = NULL;
struct device *dev = &mhi_cntrl->mhi_dev->dev;
const char *fw_name;
+ const u8 *fw_data;
void *buf;
dma_addr_t dma_addr;
- size_t size;
+ size_t size, fw_sz;
int i, ret;
if (MHI_PM_IN_ERROR_STATE(mhi_cntrl->pm_state)) {
@@ -424,6 +423,14 @@ void mhi_fw_load_handler(struct mhi_controller *mhi_cntrl)
fw_name = (mhi_cntrl->ee == MHI_EE_EDL) ?
mhi_cntrl->edl_image : mhi_cntrl->fw_image;
+ if (!fw_name && mhi_cntrl->fbc_download &&
+ mhi_cntrl->fw_data && mhi_cntrl->fw_sz) {
+ size = mhi_cntrl->sbl_size;
+ fw_data = mhi_cntrl->fw_data;
+ fw_sz = mhi_cntrl->fw_sz;
+ goto skip_req_fw;
+ }
+
if (!fw_name || (mhi_cntrl->fbc_download && (!mhi_cntrl->sbl_size ||
!mhi_cntrl->seg_len))) {
dev_err(dev,
@@ -443,6 +450,10 @@ void mhi_fw_load_handler(struct mhi_controller *mhi_cntrl)
if (size > firmware->size)
size = firmware->size;
+ fw_data = firmware->data;
+ fw_sz = firmware->size;
+
+skip_req_fw:
buf = dma_alloc_coherent(mhi_cntrl->cntrl_dev, size, &dma_addr,
GFP_KERNEL);
if (!buf) {
@@ -451,7 +462,7 @@ void mhi_fw_load_handler(struct mhi_controller *mhi_cntrl)
}
/* Download image using BHI */
- memcpy(buf, firmware->data, size);
+ memcpy(buf, fw_data, size);
ret = mhi_fw_load_bhi(mhi_cntrl, dma_addr, size);
dma_free_coherent(mhi_cntrl->cntrl_dev, size, buf, dma_addr);
@@ -463,7 +474,7 @@ void mhi_fw_load_handler(struct mhi_controller *mhi_cntrl)
}
/* Wait for ready since EDL image was loaded */
- if (fw_name == mhi_cntrl->edl_image) {
+ if (fw_name && fw_name == mhi_cntrl->edl_image) {
release_firmware(firmware);
goto fw_load_ready_state;
}
@@ -478,14 +489,14 @@ void mhi_fw_load_handler(struct mhi_controller *mhi_cntrl)
*/
if (mhi_cntrl->fbc_download) {
ret = mhi_alloc_bhie_table(mhi_cntrl, &mhi_cntrl->fbc_image,
- firmware->size);
+ fw_sz);
Minor nit, but it seems like this could be all on one line.
if (ret) {
release_firmware(firmware);
goto error_fw_load;
}
/* Load the firmware into BHIE vec table */
- mhi_firmware_copy(mhi_cntrl, firmware, mhi_cntrl->fbc_image);
+ mhi_firmware_copy(mhi_cntrl, fw_data, fw_sz, mhi_cntrl->fbc_image);
}
release_firmware(firmware);
diff --git a/include/linux/mhi.h b/include/linux/mhi.h
index a5441ad33c74..0d11fe22633e 100644
--- a/include/linux/mhi.h
+++ b/include/linux/mhi.h
@@ -299,6 +299,10 @@ struct mhi_controller_config {
* @iova_start: IOMMU starting address for data (required)
* @iova_stop: IOMMU stop address for data (required)
* @fw_image: Firmware image name for normal booting (optional)
+ * @fw_data: Firmware image data content for normal booting, used only
+ * if fw_image is NULL (optional)
The implementation requires fbc_download to be set, which is not a
requirement for fw_image. That is not apparent here.
+ * @fw_sz: Firmware image data size for normal booting, used only if fw_image
+ * is NULL (optional)
* @edl_image: Firmware image name for emergency download mode (optional)
* @rddm_size: RAM dump size that host should allocate for debugging purpose
* @sbl_size: SBL image size downloaded through BHIe (optional)
@@ -384,6 +388,8 @@ struct mhi_controller {
dma_addr_t iova_start;
dma_addr_t iova_stop;
const char *fw_image;
+ const u8 *fw_data;
+ size_t fw_sz;
Did you run pahole? I remember this struct being well packed, and I
think this will add a compiler hole but I have not actually verified.
const char *edl_image;
size_t rddm_size;
size_t sbl_size;
