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Message-ID: <8e71ba02-5d6a-4c7e-4a55-f9ef79c2f928@quicinc.com>
Date:   Mon, 30 Oct 2023 18:40:28 +0530
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Subject: Re: [PATCH v2 2/3] remoteproc: qcom: pas: make region assign more
 generic
Content-Language: en-US
To:     Neil Armstrong <neil.armstrong@linaro.org>,
        Andy Gross <agross@kernel.org>,
        Bjorn Andersson <andersson@kernel.org>,
        Konrad Dybcio <konrad.dybcio@linaro.org>,
        Mathieu Poirier <mathieu.poirier@linaro.org>,
        Rob Herring <robh+dt@kernel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@linaro.org>,
        Conor Dooley <conor+dt@kernel.org>,
        Manivannan Sadhasivam <mani@kernel.org>
CC:     <linux-arm-msm@vger.kernel.org>,
        <linux-remoteproc@vger.kernel.org>, <devicetree@vger.kernel.org>,
        <linux-kernel@vger.kernel.org>
References: <20231030-topic-sm8650-upstream-remoteproc-v2-0-609ee572e0a2@linaro.org>
 <20231030-topic-sm8650-upstream-remoteproc-v2-2-609ee572e0a2@linaro.org>
From:   Mukesh Ojha <quic_mojha@quicinc.com>
In-Reply-To: <20231030-topic-sm8650-upstream-remoteproc-v2-2-609ee572e0a2@linaro.org>
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On 10/30/2023 3:33 PM, Neil Armstrong wrote:
> The current memory region assign only supports a single
> memory region.
> 
> But new platforms introduces more regions to make the
> memory requirements more flexible for various use cases.
> Those new platforms also shares the memory region between the
> DSP and HLOS.
> 
> To handle this, make the region assign more generic in order
> to support more than a single memory region and also permit
> setting the regions permissions as shared.
> 
> Signed-off-by: Neil Armstrong <neil.armstrong@linaro.org>
> ---
>   drivers/remoteproc/qcom_q6v5_pas.c | 102 ++++++++++++++++++++++++-------------
>   1 file changed, 66 insertions(+), 36 deletions(-)
> 
> diff --git a/drivers/remoteproc/qcom_q6v5_pas.c b/drivers/remoteproc/qcom_q6v5_pas.c
> index 913a5d2068e8..4829fd26e17d 100644
> --- a/drivers/remoteproc/qcom_q6v5_pas.c
> +++ b/drivers/remoteproc/qcom_q6v5_pas.c
> @@ -33,6 +33,8 @@
>   
>   #define ADSP_DECRYPT_SHUTDOWN_DELAY_MS	100
>   
> +#define MAX_ASSIGN_COUNT 2
> +
>   struct adsp_data {
>   	int crash_reason_smem;
>   	const char *firmware_name;
> @@ -51,6 +53,9 @@ struct adsp_data {
>   	int ssctl_id;
>   
>   	int region_assign_idx;
> +	int region_assign_count;
> +	bool region_assign_shared;
> +	int region_assign_vmid;
>   };
>   
>   struct qcom_adsp {
> @@ -87,15 +92,18 @@ struct qcom_adsp {
>   	phys_addr_t dtb_mem_phys;
>   	phys_addr_t mem_reloc;
>   	phys_addr_t dtb_mem_reloc;
> -	phys_addr_t region_assign_phys;
> +	phys_addr_t region_assign_phys[MAX_ASSIGN_COUNT];
>   	void *mem_region;
>   	void *dtb_mem_region;
>   	size_t mem_size;
>   	size_t dtb_mem_size;
> -	size_t region_assign_size;
> +	size_t region_assign_size[MAX_ASSIGN_COUNT];
>   
>   	int region_assign_idx;
> -	u64 region_assign_perms;
> +	int region_assign_count;
> +	bool region_assign_shared;
> +	int region_assign_vmid;
> +	u64 region_assign_perms[MAX_ASSIGN_COUNT];
>   
>   	struct qcom_rproc_glink glink_subdev;
>   	struct qcom_rproc_subdev smd_subdev;
> @@ -590,37 +598,52 @@ static int adsp_alloc_memory_region(struct qcom_adsp *adsp)
>   
>   static int adsp_assign_memory_region(struct qcom_adsp *adsp)
>   {
> -	struct reserved_mem *rmem = NULL;
> -	struct qcom_scm_vmperm perm;
> +	struct qcom_scm_vmperm perm[MAX_ASSIGN_COUNT];
> +	unsigned int perm_size = 1;

AFAICS, not need of initialization.

>   	struct device_node *node;
> -	int ret;
> +	int offset, ret;

Nit: one variable per line.

>   
>   	if (!adsp->region_assign_idx)

Not related to this patch..
Should not this be valid only for > 1 ?


>   		return 0;
>   
> -	node = of_parse_phandle(adsp->dev->of_node, "memory-region", adsp->region_assign_idx);
> -	if (node)
> -		rmem = of_reserved_mem_lookup(node);
> -	of_node_put(node);
> -	if (!rmem) {
> -		dev_err(adsp->dev, "unable to resolve shareable memory-region\n");
> -		return -EINVAL;
> -	}
> +	for (offset = 0; offset < adsp->region_assign_count; ++offset) {
> +		struct reserved_mem *rmem = NULL;
> +
> +		node = of_parse_phandle(adsp->dev->of_node, "memory-region",
> +					adsp->region_assign_idx + offset);
> +		if (node)
> +			rmem = of_reserved_mem_lookup(node);
> +		of_node_put(node);
> +		if (!rmem) {
> +			dev_err(adsp->dev, "unable to resolve shareable memory-region index %d\n",
> +				offset);
> +			return -EINVAL; > +		}


>   
> -	perm.vmid = QCOM_SCM_VMID_MSS_MSA;
> -	perm.perm = QCOM_SCM_PERM_RW;
> +		if (adsp->region_assign_shared)  {
> +			perm[0].vmid = QCOM_SCM_VMID_HLOS;
> +			perm[0].perm = QCOM_SCM_PERM_RW;
> +			perm[1].vmid = adsp->region_assign_vmid;
> +			perm[1].perm = QCOM_SCM_PERM_RW;
> +			perm_size = 2;
> +		} else {
> +			perm[0].vmid = adsp->region_assign_vmid;
> +			perm[0].perm = QCOM_SCM_PERM_RW;
> +			perm_size = 1;
> +		}
>   
> -	adsp->region_assign_phys = rmem->base;
> -	adsp->region_assign_size = rmem->size;
> -	adsp->region_assign_perms = BIT(QCOM_SCM_VMID_HLOS);
> +		adsp->region_assign_phys[offset] = rmem->base;
> +		adsp->region_assign_size[offset] = rmem->size;
> +		adsp->region_assign_perms[offset] = BIT(QCOM_SCM_VMID_HLOS);

Do we need array for this, is this changing ?

>   
> -	ret = qcom_scm_assign_mem(adsp->region_assign_phys,
> -				  adsp->region_assign_size,
> -				  &adsp->region_assign_perms,
> -				  &perm, 1);
> -	if (ret < 0) {
> -		dev_err(adsp->dev, "assign memory failed\n");
> -		return ret;
> +		ret = qcom_scm_assign_mem(adsp->region_assign_phys[offset],
> +					  adsp->region_assign_size[offset],
> +					  &adsp->region_assign_perms[offset],
> +					  perm, perm_size);
> +		if (ret < 0) {
> +			dev_err(adsp->dev, "assign memory %d failed\n", offset);
> +			return ret;
> +		}
>   	}
>   
>   	return 0;
> @@ -629,20 +652,22 @@ static int adsp_assign_memory_region(struct qcom_adsp *adsp)
>   static void adsp_unassign_memory_region(struct qcom_adsp *adsp)
>   {
>   	struct qcom_scm_vmperm perm;
> -	int ret;
> +	int offset, ret;
>   
> -	if (!adsp->region_assign_idx)
> +	if (!adsp->region_assign_idx || adsp->region_assign_shared)
>   		return;
>   
> -	perm.vmid = QCOM_SCM_VMID_HLOS;
> -	perm.perm = QCOM_SCM_PERM_RW;
> +	for (offset = 0; offset < adsp->region_assign_count; ++offset) {
> +		perm.vmid = QCOM_SCM_VMID_HLOS;
> +		perm.perm = QCOM_SCM_PERM_RW;

>   
> -	ret = qcom_scm_assign_mem(adsp->region_assign_phys,
> -				  adsp->region_assign_size,
> -				  &adsp->region_assign_perms,
> -				  &perm, 1);
> -	if (ret < 0)
> -		dev_err(adsp->dev, "unassign memory failed\n");
> +		ret = qcom_scm_assign_mem(adsp->region_assign_phys[offset],
> +					  adsp->region_assign_size[offset],
> +					  &adsp->region_assign_perms[offset],
> +					  &perm, 1);
> +		if (ret < 0)
> +			dev_err(adsp->dev, "unassign memory failed\n");
> +	}
>   }
>   
>   static int adsp_probe(struct platform_device *pdev)
> @@ -696,6 +721,9 @@ static int adsp_probe(struct platform_device *pdev)
>   	adsp->info_name = desc->sysmon_name;
>   	adsp->decrypt_shutdown = desc->decrypt_shutdown;
>   	adsp->region_assign_idx = desc->region_assign_idx;
> +	adsp->region_assign_count = min_t(int, MAX_ASSIGN_COUNT, desc->region_assign_count);
> +	adsp->region_assign_vmid = desc->region_assign_vmid;
> +	adsp->region_assign_shared = desc->region_assign_shared;
>   	if (dtb_fw_name) {
>   		adsp->dtb_firmware_name = dtb_fw_name;
>   		adsp->dtb_pas_id = desc->dtb_pas_id;
> @@ -1163,6 +1191,8 @@ static const struct adsp_data sm8550_mpss_resource = {
>   	.sysmon_name = "modem",
>   	.ssctl_id = 0x12,
>   	.region_assign_idx = 2,
> +	.region_assign_count = 1,
> +	.region_assign_vmid = QCOM_SCM_VMID_MSS_MSA,
>   };
>   
>   static const struct of_device_id adsp_of_match[] = {
> 

-Mukesh