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Date: Thu, 16 Jul 2020 21:57:41 -0700
From: Bjorn Andersson <bjorn.andersson@...aro.org>
To: Sibi Sankar <sibis@...eaurora.org>
Cc: agross@...nel.org, linux-arm-msm@...r.kernel.org,
linux-remoteproc@...r.kernel.org, linux-kernel@...r.kernel.org,
evgreen@...omium.org, ohad@...ery.com
Subject: Re: [PATCH 2/3] remoteproc: qcom_q6v5_mss: Add MBA log extraction
support
On Thu 16 Jul 05:36 PDT 2020, Sibi Sankar wrote:
> On SC7180 the MBA firmware stores the bootup text logs in a 4K segment
> at the beginning of the MBA region. Add support to extract the logs
> which will be useful to debug mba boot/authentication issues.
>
> Signed-off-by: Sibi Sankar <sibis@...eaurora.org>
> ---
> drivers/remoteproc/qcom_q6v5_mss.c | 41 ++++++++++++++++++++++++++----
> 1 file changed, 36 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/remoteproc/qcom_q6v5_mss.c b/drivers/remoteproc/qcom_q6v5_mss.c
> index 95e21ed607cb9..4ddf084b2c6fc 100644
> --- a/drivers/remoteproc/qcom_q6v5_mss.c
> +++ b/drivers/remoteproc/qcom_q6v5_mss.c
> @@ -9,6 +9,7 @@
>
> #include <linux/clk.h>
> #include <linux/delay.h>
> +#include <linux/devcoredump.h>
> #include <linux/dma-mapping.h>
> #include <linux/interrupt.h>
> #include <linux/kernel.h>
> @@ -37,6 +38,8 @@
>
> #define MPSS_CRASH_REASON_SMEM 421
>
> +#define MBA_LOG_SIZE SZ_4K
> +
> /* RMB Status Register Values */
> #define RMB_PBL_SUCCESS 0x1
>
> @@ -139,6 +142,7 @@ struct rproc_hexagon_res {
> int version;
> bool need_mem_protection;
> bool has_alt_reset;
> + bool has_mba_logs;
> bool has_spare_reg;
> };
>
> @@ -200,6 +204,7 @@ struct q6v5 {
> struct qcom_sysmon *sysmon;
> bool need_mem_protection;
> bool has_alt_reset;
> + bool has_mba_logs;
> bool has_spare_reg;
> int mpss_perm;
> int mba_perm;
> @@ -518,6 +523,19 @@ static int q6v5_rmb_mba_wait(struct q6v5 *qproc, u32 status, int ms)
> return val;
> }
>
> +static void q6v5_dump_mba_logs(struct q6v5 *qproc)
> +{
> + struct rproc *rproc = qproc->rproc;
> + void *data;
> +
> + data = vmalloc(MBA_LOG_SIZE);
> + if (!data)
> + return;
> +
> + memcpy(data, qproc->mba_region, MBA_LOG_SIZE);
> + dev_coredumpv(&rproc->dev, data, MBA_LOG_SIZE, GFP_KERNEL);
> +}
> +
> static int q6v5proc_reset(struct q6v5 *qproc)
> {
> u32 val;
> @@ -838,6 +856,7 @@ static int q6v5_mba_load(struct q6v5 *qproc)
> {
> int ret;
> int xfermemop_ret;
> + bool mba_load_err = false;
>
> qcom_q6v5_prepare(&qproc->q6v5);
>
> @@ -931,7 +950,7 @@ static int q6v5_mba_load(struct q6v5 *qproc)
> q6v5proc_halt_axi_port(qproc, qproc->halt_map, qproc->halt_q6);
> q6v5proc_halt_axi_port(qproc, qproc->halt_map, qproc->halt_modem);
> q6v5proc_halt_axi_port(qproc, qproc->halt_map, qproc->halt_nc);
> -
> + mba_load_err = true;
> reclaim_mba:
> xfermemop_ret = q6v5_xfer_mem_ownership(qproc, &qproc->mba_perm, true,
> false, qproc->mba_phys,
> @@ -939,6 +958,8 @@ static int q6v5_mba_load(struct q6v5 *qproc)
> if (xfermemop_ret) {
> dev_err(qproc->dev,
> "Failed to reclaim mba buffer, system may become unstable\n");
> + } else if (qproc->has_mba_logs & mba_load_err) {
> + q6v5_dump_mba_logs(qproc);
> }
>
> disable_active_clks:
> @@ -968,7 +989,7 @@ static int q6v5_mba_load(struct q6v5 *qproc)
> return ret;
> }
>
> -static void q6v5_mba_reclaim(struct q6v5 *qproc)
> +static void q6v5_mba_reclaim(struct q6v5 *qproc, bool err_path)
> {
> int ret;
> u32 val;
> @@ -1006,6 +1027,9 @@ static void q6v5_mba_reclaim(struct q6v5 *qproc)
> qproc->mba_size);
> WARN_ON(ret);
>
> + if (qproc->has_mba_logs && err_path && !ret)
Wouldn't it be possible to just call q6v5_dump_mba_logs() directly after
the return from q6v5_mba_reclaim()? That way we can avoid passing the
bool to indicate if the reclaim should also dump some stuff.
Sure we don't have a way to tell if the assign_mem failed, but we're
going to crash shortly anyways (which is something we should change).
I think you should move the has_mba_logs into q6v5_dump_mba_logs(),
making it cause an early return.
Regards,
Bjorn
> + q6v5_dump_mba_logs(qproc);
> +
> ret = qcom_q6v5_unprepare(&qproc->q6v5);
> if (ret) {
> q6v5_pds_disable(qproc, qproc->proxy_pds,
> @@ -1255,7 +1279,7 @@ static void qcom_q6v5_dump_segment(struct rproc *rproc,
> false, true,
> qproc->mpss_phys,
> qproc->mpss_size);
> - q6v5_mba_reclaim(qproc);
> + q6v5_mba_reclaim(qproc, false);
> }
> }
> }
> @@ -1297,7 +1321,7 @@ static int q6v5_start(struct rproc *rproc)
> return 0;
>
> reclaim_mpss:
> - q6v5_mba_reclaim(qproc);
> + q6v5_mba_reclaim(qproc, true);
>
> return ret;
> }
> @@ -1313,7 +1337,7 @@ static int q6v5_stop(struct rproc *rproc)
> if (ret == -ETIMEDOUT)
> dev_err(qproc->dev, "timed out on wait\n");
>
> - q6v5_mba_reclaim(qproc);
> + q6v5_mba_reclaim(qproc, false);
>
> return 0;
> }
> @@ -1717,6 +1741,7 @@ static int q6v5_probe(struct platform_device *pdev)
>
> qproc->version = desc->version;
> qproc->need_mem_protection = desc->need_mem_protection;
> + qproc->has_mba_logs = desc->has_mba_logs;
>
> ret = qcom_q6v5_init(&qproc->q6v5, pdev, rproc, MPSS_CRASH_REASON_SMEM,
> qcom_msa_handover);
> @@ -1808,6 +1833,7 @@ static const struct rproc_hexagon_res sc7180_mss = {
> },
> .need_mem_protection = true,
> .has_alt_reset = false,
> + .has_mba_logs = true,
> .has_spare_reg = true,
> .version = MSS_SC7180,
> };
> @@ -1843,6 +1869,7 @@ static const struct rproc_hexagon_res sdm845_mss = {
> },
> .need_mem_protection = true,
> .has_alt_reset = true,
> + .has_mba_logs = true,
> .has_spare_reg = false,
> .version = MSS_SDM845,
> };
> @@ -1870,6 +1897,7 @@ static const struct rproc_hexagon_res msm8998_mss = {
> },
> .need_mem_protection = true,
> .has_alt_reset = false,
> + .has_mba_logs = false,
> .has_spare_reg = false,
> .version = MSS_MSM8998,
> };
> @@ -1900,6 +1928,7 @@ static const struct rproc_hexagon_res msm8996_mss = {
> },
> .need_mem_protection = true,
> .has_alt_reset = false,
> + .has_mba_logs = false,
> .has_spare_reg = false,
> .version = MSS_MSM8996,
> };
> @@ -1933,6 +1962,7 @@ static const struct rproc_hexagon_res msm8916_mss = {
> },
> .need_mem_protection = false,
> .has_alt_reset = false,
> + .has_mba_logs = false,
> .has_spare_reg = false,
> .version = MSS_MSM8916,
> };
> @@ -1974,6 +2004,7 @@ static const struct rproc_hexagon_res msm8974_mss = {
> },
> .need_mem_protection = false,
> .has_alt_reset = false,
> + .has_mba_logs = false,
> .has_spare_reg = false,
> .version = MSS_MSM8974,
> };
> --
> The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
> a Linux Foundation Collaborative Project
>
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