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Date: Wed, 1 Nov 2023 20:12:40 +0530
From: Mukesh Ojha <quic_mojha@...cinc.com>
To: <neil.armstrong@...aro.org>, Andy Gross <agross@...nel.org>,
Bjorn Andersson <andersson@...nel.org>,
Konrad Dybcio <konrad.dybcio@...aro.org>,
Mathieu Poirier <mathieu.poirier@...aro.org>,
Rob Herring <robh+dt@...nel.org>,
Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
Conor Dooley <conor+dt@...nel.org>,
Manivannan Sadhasivam <mani@...nel.org>
CC: <linux-arm-msm@...r.kernel.org>,
<linux-remoteproc@...r.kernel.org>, <devicetree@...r.kernel.org>,
<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 2/3] remoteproc: qcom: pas: make region assign more
generic
On 10/31/2023 10:36 PM, Neil Armstrong wrote:
> Hi,
>
> On 30/10/2023 14:10, Mukesh Ojha wrote:
>>
>>
>> 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@...aro.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.
>
> Indeed, removed
>
>>
>>> struct device_node *node;
>>> - int ret;
>>> + int offset, ret;
>>
>> Nit: one variable per line.
>
> Done
>
>>
>>> if (!adsp->region_assign_idx)
>>
>> Not related to this patch..
>> Should not this be valid only for > 1 ?
>
> I don't understand, only region_assign_idx > 1 triggers a memory_assign,
> and this check discards configurations with region_assign_idx == 0 as
> expected.
Ah, you can ignore the comments, I got the intention after commenting
here ..
>
>>
>>
>>> 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 ?
>
> We need to keep region_assign_perms for unassign, but for the other 2 we
> would
> need to duplicate the code from adsp_assign_memory_region into
> adsp_unassign_memory_region.
Thanks got it.
>
>>
>>> - 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;
Should this also need
min_t(int, MAX_ASSIGN_COUNT - 1, desc->region_assign_idx);
as no where boundary check is being done.
-Mukesh
>>> + 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
>
> Thanks,
> Neil
>
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