Re: [PATCH v3] wifi: ath10k: Add WLAN firmware image version info into smem
From: Youghandhar Chintala (Temp)
Date: Thu Nov 17 2022 - 12:55:16 EST
On 11/12/2022 1:53 AM, Bjorn Andersson wrote:
On Fri, Nov 11, 2022 at 05:12:35PM +0530, Youghandhar Chintala wrote:
Can you please change the subject to:
wifi: ath10k: Store WLAN firmware version in SMEM image table
In a SoC based solution, it would be useful to know the versions of the
various binary firmware blobs the system is running on. On a QCOM based
SoC, this info can be obtained from socinfo debugfs infrastructure. For
this to work, respective subsystem drivers have to export the firmware
version information to an SMEM based version information table.
Having firmware version information at one place will help quickly
figure out the firmware versions of various subsystems on the device
instead of going through builds/logs in an event of a system crash.
Fill WLAN firmware version information in SMEM version table to be
printed as part of socinfo debugfs infrastructure on a Qualcomm based
SoC.
This change is applicable only for WCN399X targets.
Why is this restricted to WCN399X? Is it not the case that it only
relates to the SNOC/QMI-based implementation? Perhaps that's the same
thing, but if so I think the comment could be improved.
Example:
cat /sys/kernel/debug/qcom_socinfo/cnss/name
QC_IMAGE_VERSION_STRING=WLAN.HL.3.2.2.c10-00754-QCAHLSWMTPL-1
Reported-by: kernel test robot <lkp@xxxxxxxxx>
I don't think that kernel test robot reported the lack of this feature.
Tested-on: WCN3990 hw1.0 SNOC WLAN.HL.3.2.2.c10-00754-QCAHLSWMTPL-1
Signed-off-by: Youghandhar Chintala <quic_youghand@xxxxxxxxxxx>
---
Changes from v2:
- Removed blank line between trailers
- Changed memcpy to strscpy
- Removed version_string_size
- Added new condition fw_build_id against max length
- Added depends on QCOM_SMEM for ath10k_snoc
---
drivers/net/wireless/ath/ath10k/Kconfig | 1 +
drivers/net/wireless/ath/ath10k/qmi.c | 34 +++++++++++++++++++++++++
2 files changed, 35 insertions(+)
diff --git a/drivers/net/wireless/ath/ath10k/Kconfig b/drivers/net/wireless/ath/ath10k/Kconfig
index ca007b800f75..e6ea884cafc1 100644
--- a/drivers/net/wireless/ath/ath10k/Kconfig
+++ b/drivers/net/wireless/ath/ath10k/Kconfig
@@ -44,6 +44,7 @@ config ATH10K_SNOC
tristate "Qualcomm ath10k SNOC support"
depends on ATH10K
depends on ARCH_QCOM || COMPILE_TEST
+ depends on QCOM_SMEM
select QCOM_SCM
select QCOM_QMI_HELPERS
help
diff --git a/drivers/net/wireless/ath/ath10k/qmi.c b/drivers/net/wireless/ath/ath10k/qmi.c
index 66cb7a1e628a..6c3ddad26417 100644
--- a/drivers/net/wireless/ath/ath10k/qmi.c
+++ b/drivers/net/wireless/ath/ath10k/qmi.c
@@ -14,6 +14,7 @@
#include <linux/net.h>
#include <linux/platform_device.h>
#include <linux/qcom_scm.h>
+#include <linux/soc/qcom/smem.h>
#include <linux/string.h>
#include <net/sock.h>
@@ -22,6 +23,8 @@
#define ATH10K_QMI_CLIENT_ID 0x4b4e454c
#define ATH10K_QMI_TIMEOUT 30
+#define ATH10K_SMEM_IMAGE_VERSION_TABLE 469
This isn't the ATH10K SMEM_IMAGE_VERSION_TABLE, it's the one and only
SMEM_IMAGE_VERSION_TABLE. As that is defined in socinfo.c, you can
use the same define here.
+#define ATH10K_SMEM_IMAGE_TABLE_CNSS_INDEX 13
SMEM_IMAGE_TABLE_CNSS_INDEX
static int ath10k_qmi_map_msa_permission(struct ath10k_qmi *qmi,
struct ath10k_msa_mem_info *mem_info)
@@ -536,6 +539,35 @@ int ath10k_qmi_wlan_disable(struct ath10k *ar)
return ath10k_qmi_mode_send_sync_msg(ar, QMI_WLFW_OFF_V01);
}
+static void ath10k_qmi_add_wlan_ver_smem(struct ath10k *ar, const char *fw_build_id)
+{
+ u8 *smem_table_ptr;
I don't think "smem" or "ptr" adds any value in this variable name.
"table" should be sufficient.
+ size_t smem_block_size;
This is the "smem_item_size".
+ const u32 smem_img_idx_wlan = ATH10K_SMEM_IMAGE_TABLE_CNSS_INDEX * 128;
Why not just "offset"?
#define SMEM_IMAGE_VERSION_ENTRY_SIZE 128
Instead of writing 128 here and abusing MAX_BUILD_ID_LEN below.
+
+ smem_table_ptr = qcom_smem_get(QCOM_SMEM_HOST_ANY,
+ ATH10K_SMEM_IMAGE_VERSION_TABLE,
+ &smem_block_size);
+ if (IS_ERR(smem_table_ptr)) {
+ ath10k_dbg(ar, ATH10K_DBG_QMI,
+ "smem image version table not found\n");
+ return;
+ }
+
+ if (smem_img_idx_wlan + MAX_BUILD_ID_LEN > smem_block_size) {
+ ath10k_dbg(ar, ATH10K_DBG_QMI, "smem block size too small: %zu\n",
+ smem_block_size);
You found a IMAGE_VERSION_TABLE, but it's smaller than expected. That
sounds like an ath10k_err() to me.
+ return;
+ }
+
+ if (strlen(fw_build_id) > MAX_BUILD_ID_LEN) {
Is this really a concern, if the string is too long strscpy() below will
truncate it.
+ ath10k_dbg(ar, ATH10K_DBG_QMI, "fw_build_id length more than max length\n");
+ return;
+ }
+
+ strscpy(smem_table_ptr + smem_img_idx_wlan, fw_build_id, MAX_BUILD_ID_LEN);
MAX_BUILD_ID_LEN is the length of fw_build_id, which is 128.
But the memory you're writing to is defined as:
struct smem_image_version {
char name[SMEM_IMAGE_VERSION_NAME_SIZE];
char variant[SMEM_IMAGE_VERSION_VARIANT_SIZE];
char pad;
char oem[SMEM_IMAGE_VERSION_OEM_SIZE];
};
With SMEM_IMAGE_VERSION_NAME_SIZE being 75.
+}
+
static int ath10k_qmi_cap_send_sync_msg(struct ath10k_qmi *qmi)
{
struct wlfw_cap_resp_msg_v01 *resp;
@@ -606,6 +638,8 @@ static int ath10k_qmi_cap_send_sync_msg(struct ath10k_qmi *qmi)
qmi->fw_version, qmi->fw_build_timestamp, qmi->fw_build_id);
}
+ ath10k_qmi_add_wlan_ver_smem(ar, qmi->fw_build_id);
qmi->fw_build_id is only valid if resp->fw_build_id_valid is set...
Regards,
Bjorn
+
kfree(resp);
return 0;
--
2.38.0
Thank you Andersson. I will address all your comments in my next version
of patch.