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Date:   Sun, 10 Nov 2019 22:45:24 -0800
From:   Bjorn Andersson <bjorn.andersson@linaro.org>
To:     Luca Weiss <luca@z3ntu.xyz>
Cc:     linux-arm-msm@vger.kernel.org, Ohad Ben-Cohen <ohad@wizery.com>,
        Avaneesh Kumar Dwivedi <akdwived@codeaurora.org>,
        linux-remoteproc@vger.kernel.org, linux-kernel@vger.kernel.org,
        Sibi Sankar <sibis@codeaurora.org>,
        Jeffrey Hugo <jeffrey.l.hugo@gmail.com>,
        Brian Masney <masneyb@onstation.org>
Subject: Re: [PATCH v2 2/2] remoteproc: qcom_q6v5_mss: Validate each segment
 during loading
Message-ID: <20191111064524.GD2917@yoga>
References: <20191109004033.1496871-1-bjorn.andersson@linaro.org>
 <20191109004033.1496871-3-bjorn.andersson@linaro.org>
 <393350950.66DGQb6nHQ@g550jk>
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On Sun 10 Nov 06:05 PST 2019, Luca Weiss wrote:

> Hi Bjorn,
> 
> with your patches and modifications in qcom-msm8974.dtsi, I can boot the modem 
> successfully on the Fairphone 2, without the 'hack' commit we had in the tree 
> before! Thanks!
> 
> Tested-by: Luca Weiss <luca@z3ntu.xyz>
> 

Thanks for reminding me about this being an issue in 8974, had forgotten
about that.I'll slap a Fixes on it once I'm applying it.

Regards,
Bjorn

> On Samstag, 9. November 2019 01:40:33 CET Bjorn Andersson wrote:
> > The code used to sync with the MBA after each segment loaded and this is
> > still what's done downstream. So reduce the delta towards downstream by
> > switching to a model where the content is iteratively validated.
> > 
> > Reviewed-by: Jeffrey Hugo <jeffrey.l.hugo@gmail.com>
> > Tested-by: Jeffrey Hugo <jeffrey.l.hugo@gmail.com>
> > Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>
> > ---
> > 
> > Changes since v1:
> > - Picked up Jeff's r-b and t-b
> > 
> >  drivers/remoteproc/qcom_q6v5_mss.c | 76 ++++++++++++++++++++----------
> >  1 file changed, 51 insertions(+), 25 deletions(-)
> > 
> > diff --git a/drivers/remoteproc/qcom_q6v5_mss.c
> > b/drivers/remoteproc/qcom_q6v5_mss.c index efab574b2e12..914d5546e1cf
> > 100644
> > --- a/drivers/remoteproc/qcom_q6v5_mss.c
> > +++ b/drivers/remoteproc/qcom_q6v5_mss.c
> > @@ -358,23 +358,29 @@ static void q6v5_pds_disable(struct q6v5 *qproc,
> > struct device **pds, }
> > 
> >  static int q6v5_xfer_mem_ownership(struct q6v5 *qproc, int *current_perm,
> > -				   bool remote_owner, phys_addr_t 
> addr,
> > +				   bool local, bool remote, 
> phys_addr_t addr,
> >  				   size_t size)
> >  {
> > -	struct qcom_scm_vmperm next;
> > +	struct qcom_scm_vmperm next[2];
> > +	int perms = 0;
> > 
> >  	if (!qproc->need_mem_protection)
> >  		return 0;
> > -	if (remote_owner && *current_perm == BIT(QCOM_SCM_VMID_MSS_MSA))
> > -		return 0;
> > -	if (!remote_owner && *current_perm == BIT(QCOM_SCM_VMID_HLOS))
> > -		return 0;
> > 
> > -	next.vmid = remote_owner ? QCOM_SCM_VMID_MSS_MSA : 
> QCOM_SCM_VMID_HLOS;
> > -	next.perm = remote_owner ? QCOM_SCM_PERM_RW : QCOM_SCM_PERM_RWX;
> > +	if (local) {
> > +		next[perms].vmid = QCOM_SCM_VMID_HLOS;
> > +		next[perms].perm = QCOM_SCM_PERM_RWX;
> > +		perms++;
> > +	}
> > +
> > +	if (remote) {
> > +		next[perms].vmid = QCOM_SCM_VMID_MSS_MSA;
> > +		next[perms].perm = QCOM_SCM_PERM_RW;
> > +		perms++;
> > +	}
> > 
> >  	return qcom_scm_assign_mem(addr, ALIGN(size, SZ_4K),
> > -				   current_perm, &next, 1);
> > +				   current_perm, next, perms);
> >  }
> > 
> >  static int q6v5_load(struct rproc *rproc, const struct firmware *fw)
> > @@ -681,7 +687,7 @@ static int q6v5_mpss_init_image(struct q6v5 *qproc,
> > const struct firmware *fw)
> > 
> >  	/* 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);
> > +	ret = q6v5_xfer_mem_ownership(qproc, &mdata_perm, false, true, 
> phys,
> > size); if (ret) {
> >  		dev_err(qproc->dev,
> >  			"assigning Q6 access to metadata failed: 
> %d\n", ret);
> > @@ -699,7 +705,7 @@ static int q6v5_mpss_init_image(struct q6v5 *qproc,
> > const struct firmware *fw) dev_err(qproc->dev, "MPSS header authentication
> > failed: %d\n", ret);
> > 
> >  	/* Metadata authentication done, remove modem access */
> > -	xferop_ret = q6v5_xfer_mem_ownership(qproc, &mdata_perm, false, 
> phys,
> > size); +	xferop_ret = q6v5_xfer_mem_ownership(qproc, &mdata_perm, true,
> > false, phys, size); if (xferop_ret)
> >  		dev_warn(qproc->dev,
> >  			 "mdt buffer not reclaimed system may become 
> unstable\n");
> > @@ -786,7 +792,7 @@ static int q6v5_mba_load(struct q6v5 *qproc)
> >  	}
> > 
> >  	/* Assign MBA image access in DDR to q6 */
> > -	ret = q6v5_xfer_mem_ownership(qproc, &qproc->mba_perm, true,
> > +	ret = q6v5_xfer_mem_ownership(qproc, &qproc->mba_perm, false, true,
> >  				      qproc->mba_phys, qproc-
> >mba_size);
> >  	if (ret) {
> >  		dev_err(qproc->dev,
> > @@ -820,8 +826,8 @@ static int q6v5_mba_load(struct q6v5 *qproc)
> >  	q6v5proc_halt_axi_port(qproc, qproc->halt_map, qproc->halt_nc);
> > 
> >  reclaim_mba:
> > -	xfermemop_ret = q6v5_xfer_mem_ownership(qproc, &qproc->mba_perm, 
> false,
> > -						qproc-
> >mba_phys,
> > +	xfermemop_ret = q6v5_xfer_mem_ownership(qproc, &qproc->mba_perm, 
> true,
> > +						false, 
> qproc->mba_phys,
> >  						qproc-
> >mba_size);
> >  	if (xfermemop_ret) {
> >  		dev_err(qproc->dev,
> > @@ -888,7 +894,7 @@ static void q6v5_mba_reclaim(struct q6v5 *qproc)
> >  	/* In case of failure or coredump scenario where reclaiming MBA 
> memory
> >  	 * could not happen reclaim it here.
> >  	 */
> > -	ret = q6v5_xfer_mem_ownership(qproc, &qproc->mba_perm, false,
> > +	ret = q6v5_xfer_mem_ownership(qproc, &qproc->mba_perm, true, false,
> >  				      qproc->mba_phys,
> >  				      qproc->mba_size);
> >  	WARN_ON(ret);
> > @@ -915,6 +921,7 @@ static int q6v5_mpss_load(struct q6v5 *qproc)
> >  	phys_addr_t boot_addr;
> >  	phys_addr_t min_addr = PHYS_ADDR_MAX;
> >  	phys_addr_t max_addr = 0;
> > +	u32 code_length;
> >  	bool relocate = false;
> >  	char *fw_name;
> >  	size_t fw_name_len;
> > @@ -965,9 +972,19 @@ static int q6v5_mpss_load(struct q6v5 *qproc)
> >  	}
> > 
> >  	/* Try to reset ownership back to Linux */
> > -	q6v5_xfer_mem_ownership(qproc, &qproc->mpss_perm, false,
> > +	q6v5_xfer_mem_ownership(qproc, &qproc->mpss_perm, true, false,
> >  				qproc->mpss_phys, qproc-
> >mpss_size);
> > 
> > +	/* Share ownership between Linux and MSS, during segment loading */
> > +	ret = q6v5_xfer_mem_ownership(qproc, &qproc->mpss_perm, true, true,
> > +				      qproc->mpss_phys, qproc-
> >mpss_size);
> > +	if (ret) {
> > +		dev_err(qproc->dev,
> > +			"assigning Q6 access to mpss memory failed: 
> %d\n", ret);
> > +		ret = -EAGAIN;
> > +		goto release_firmware;
> > +	}
> > +
> >  	mpss_reloc = relocate ? min_addr : qproc->mpss_phys;
> >  	qproc->mpss_reloc = mpss_reloc;
> >  	/* Load firmware segments */
> > @@ -1016,10 +1033,24 @@ static int q6v5_mpss_load(struct q6v5 *qproc)
> >  			       phdr->p_memsz - phdr->p_filesz);
> >  		}
> >  		size += phdr->p_memsz;
> > +
> > +		code_length = readl(qproc->rmb_base + 
> RMB_PMI_CODE_LENGTH_REG);
> > +		if (!code_length) {
> > +			boot_addr = relocate ? qproc->mpss_phys : 
> min_addr;
> > +			writel(boot_addr, qproc->rmb_base + 
> RMB_PMI_CODE_START_REG);
> > +			writel(RMB_CMD_LOAD_READY, qproc->rmb_base + 
> RMB_MBA_COMMAND_REG);
> > +		}
> > +		writel(size, qproc->rmb_base + RMB_PMI_CODE_LENGTH_REG);
> > +
> > +		ret = readl(qproc->rmb_base + RMB_MBA_STATUS_REG);
> > +		if (ret < 0) {
> > +			dev_err(qproc->dev, "MPSS authentication 
> failed: %d\n", ret);
> > +			goto release_firmware;
> > +		}
> >  	}
> > 
> >  	/* Transfer ownership of modem ddr region to q6 */
> > -	ret = q6v5_xfer_mem_ownership(qproc, &qproc->mpss_perm, true,
> > +	ret = q6v5_xfer_mem_ownership(qproc, &qproc->mpss_perm, false, 
> true,
> >  				      qproc->mpss_phys, qproc-
> >mpss_size);
> >  	if (ret) {
> >  		dev_err(qproc->dev,
> > @@ -1028,11 +1059,6 @@ static int q6v5_mpss_load(struct q6v5 *qproc)
> >  		goto release_firmware;
> >  	}
> > 
> > -	boot_addr = relocate ? qproc->mpss_phys : min_addr;
> > -	writel(boot_addr, qproc->rmb_base + RMB_PMI_CODE_START_REG);
> > -	writel(RMB_CMD_LOAD_READY, qproc->rmb_base + RMB_MBA_COMMAND_REG);
> > -	writel(size, qproc->rmb_base + RMB_PMI_CODE_LENGTH_REG);
> > -
> >  	ret = q6v5_rmb_mba_wait(qproc, RMB_MBA_AUTH_COMPLETE, 10000);
> >  	if (ret == -ETIMEDOUT)
> >  		dev_err(qproc->dev, "MPSS authentication timed out\n");
> > @@ -1061,7 +1087,7 @@ static void qcom_q6v5_dump_segment(struct rproc
> > *rproc, ret = q6v5_mba_load(qproc);
> > 
> >  		/* Try to reset ownership back to Linux */
> > -		q6v5_xfer_mem_ownership(qproc, &qproc->mpss_perm, 
> false,
> > +		q6v5_xfer_mem_ownership(qproc, &qproc->mpss_perm, true, 
> false,
> >  					qproc->mpss_phys, 
> qproc->mpss_size);
> >  	}
> > 
> > @@ -1101,8 +1127,8 @@ static int q6v5_start(struct rproc *rproc)
> >  		goto reclaim_mpss;
> >  	}
> > 
> > -	xfermemop_ret = q6v5_xfer_mem_ownership(qproc, &qproc->mba_perm, 
> false,
> > -						qproc-
> >mba_phys,
> > +	xfermemop_ret = q6v5_xfer_mem_ownership(qproc, &qproc->mba_perm, 
> true,
> > +						false, 
> qproc->mba_phys,
> >  						qproc-
> >mba_size);
> >  	if (xfermemop_ret)
> >  		dev_err(qproc->dev,
>