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Date: Tue, 18 Apr 2023 15:02:57 +0100
From: Srinivas Kandagatla <srinivas.kandagatla@...aro.org>
To: Mukesh Ojha <quic_mojha@...cinc.com>, agross@...nel.org,
andersson@...nel.org, konrad.dybcio@...aro.org, corbet@....net,
keescook@...omium.org, tony.luck@...el.com, gpiccoli@...lia.com,
catalin.marinas@....com, will@...nel.org
Cc: linux-arm-msm@...r.kernel.org, linux-remoteproc@...r.kernel.org,
linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org,
linux-arm-kernel@...ts.infradead.org, linux-doc@...r.kernel.org
Subject: Re: [PATCH v2 2/6] remoteproc: qcom: Move minidump specific data to
qcom_minidump.h
On 17/04/2023 14:22, Mukesh Ojha wrote:
>
>
> On 4/14/2023 4:10 PM, Srinivas Kandagatla wrote:
>>
>>
>> On 14/04/2023 08:05, Mukesh Ojha wrote:
>>> Thanks again for coming back on this.
>>>
>>> On 4/14/2023 4:02 AM, Srinivas Kandagatla wrote:
>>>>
>>>>
>>>> On 22/03/2023 13:30, Mukesh Ojha wrote:
>>>>> Move minidump specific data types and macros to a separate internal
>>>>> header(qcom_minidump.h) so that it can be shared among different
>>>>
>>>> minidump.h should be good as we are already in include/soc/qcom/
>>>
>>>
>>> Initially, i wanted to protect the content of qcom_minidump.h between
>>> qcom_minidump.c and qcom_common.c
>>>
>>> Ideally, here qcom_minidump.h should be supplier/provider header and can
>>
>> Am not sure if I understand the supplier concept correctly.
>> AFAIU, we have a 2 sets of apis
>>
>> 1. get hold of minidump descriptor based on minidump_id fro gtoc using
>> qcom_minidump_subsystem_desc(). Am assuming which ever driver uses
>> this api will set there segments and regions in there respective drivers.
>>
>> 2. setting regions/segments in APSS minidump descriptors which are
>> done via qcom_minidump_region_register(). TBH this should be renamed
>> to qcom_apss_minidump_region_register().
>>
>> mixing of thsee apis makes it bit confusing, specially we have these
>> two category of apis that deal with different things.
>>
>> Does it make sense to spit and abstract them properly by doing?
>>
>>
>> 1. minidump driver to deal with handling gtoc and providing
>> descriptors to the consumers like remoteproc or apss, This can
>> probably live within smem driver as loc for this support is very
>> minimal and proabably rename the api accordingly.
>>
>
>> 2. apss_minidump driver to allow other qcom drivers to
>> register/unregister regions within apss minidump descriptor.
>>
>> did I miss something?
>
> No, you are correct with your understanding.
>
> To your suggestion to split code and to keep
> qcom_minidump_subsystem_desc() live inside smem driver,
>
> And how about the header qcom_minidump.h, should we keep it separate
> than the apss minidump client header minidump.h ?
I tried to do what I suggested and it kinda looked okay w.r.t design but
started to look like a bit overdo.
other thing that I tried like what you have in patches but creating a
dedicated platform driver for minidump (along with apss minidump), just
like other smem devices like socinfo..
This should also get rid of qcom_minidump_ready().
>
> Since, you kind of understand the driver now, do you think it is worth
> to create platform device for minidump from smem driver, and
> have a probe inside apss minidump driver to solve chicken and egg
> problem for the clients who comes before minidump and try to register
> itself without doing ready check and apss_minidump can note this client
> entry and only register this region once minidump probe success and then
> it can register all the noted clients in one go.
yes, it is doable.
>
> The reason to do this would be apss_minidump driver has no meaning
> without smem, and for this reason checking qcom_minidump_ready() would
> not be ideal for at least qcom clients and for core kernel may be.
>
how about something like this:
-------------------->cut<-----------------------
diff --git a/drivers/soc/qcom/minidump.c b/drivers/soc/qcom/minidump.c
new file mode 100644
index 000000000000..4171054b268d
--- /dev/null
+++ b/drivers/soc/qcom/minidump.c
@@ -0,0 +1,100 @@
+#include <linux/module.h>
+#include <linux/platform_device.h>
+#include <linux/soc/qcom/smem.h>
+#include <linux/soc/qcom/minidump.h>
+
+...
+
+struct minidump {
+ struct minidump_global_toc *md_gbl_toc;
+ struct minidump_subsystem *md_apss_toc;
+ ...
+};
+
+struct minidump *__md;
+
+struct minidump_subsystem *qcom_minidump_subsystem_desc(unsigned int
minidump_index)
+{
+ if (!__md)
+ return PTR_ERR(-EPROBE_DEFER);
+
+ return &__mdgtoc->subsystems[minidump_index];
+}
+EXPORT_SYMBOL(qcom_minidump_subsystem_desc);
+
+
+int qcom_minidump_apss_region_register(const struct
qcom_minidump_region *region)
+{
+ if (!__mdgtoc)
+ return -EPROBE_DEFER;
+ ...
+}
+EXPORT_SYMBOL_GPL(qcom_minidump_apss_region_register);
+
+static int qcom_minidump_init_apss_subsystem(struct minidumd *md)
+{
+ struct minidump_subsystem *apsstoc;
+
+ apsstoc = qcom_minidump_subsystem_desc(MINIDUMP_APSS_DESC);
+ if (IS_ERR(apsstoc))
+ return -EINVAL;
+
+ md->md_regions = kcalloc(MAX_NUM_ENTRIES,
+ sizeof(struct minidump_region), GFP_KERNEL);
+ if (!md->md_regions)
+ return -ENOMEM;
+
+ minidump.apss_toc = apsstoc;
+
+ ...
+
+ return 0;
+}
+static int qcom_minidump_probe(struct platform_device *pdev)
+{
+ struct minidump *md;
+ struct minidump_global_toc *mdgtoc;
+
+ md = devm_kzalloc(&pdev->dev, sizeof(*md), GFP_KERNEL);
+
+ ...
+ mdgtoc = qcom_smem_get(QCOM_SMEM_HOST_ANY, SBL_MINIDUMP_SMEM_ID,
&size);
+ if (IS_ERR(mdgtoc)) {
+ dev_err(&pdev->dev, "Couldn't find minidump\n");
+ return ERR_PTR(mdgtoc);
+ }
+
+ if (size < sizeof(*mdgtoc) || !mdgtoc->status) {
+ dev_err(&pdev->dev, "Minidump table is not initialized\n");
+ return ERR_PTR(-EINVAL);
+ }
+ ...
+ qcom_minidump_init_apss_subsystem(md);
+
+ __md = md;
+ ...
+ return 0;
+}
+
+static int qcom_minidump_remove(struct platform_device *pdev)
+{
+ struct qcom_minidump *qs = platform_get_drvdata(pdev);
+
+ ...
+
+ return 0;
+}
+
+static struct platform_driver qcom_minidump_driver = {
+ .probe = qcom_minidump_probe,
+ .remove = qcom_minidump_remove,
+ .driver = {
+ .name = "qcom-minidump",
+ },
+};
+
+module_platform_driver(qcom_minidump_driver);
+
+MODULE_DESCRIPTION("Qualcomm minidump driver");
+MODULE_LICENSE("GPL v2");
+MODULE_ALIAS("platform:qcom-minidump");
diff --git a/drivers/soc/qcom/smem.c b/drivers/soc/qcom/smem.c
index 4f163d62942c..d54b07095ddd 100644
--- a/drivers/soc/qcom/smem.c
+++ b/drivers/soc/qcom/smem.c
@@ -279,6 +279,7 @@ struct qcom_smem {
u32 item_count;
struct platform_device *socinfo;
+ struct platform_device *minidump;
struct smem_ptable *ptable;
struct smem_partition global_partition;
struct smem_partition partitions[SMEM_HOST_COUNT];
@@ -1151,12 +1152,19 @@ static int qcom_smem_probe(struct
platform_device *pdev)
if (IS_ERR(smem->socinfo))
dev_dbg(&pdev->dev, "failed to register socinfo device\n");
+ smem->minidump = platform_device_register_data(&pdev->dev,
"qcom-minidump",
+
PLATFORM_DEVID_NONE, NULL,
+ 0);
+ if (IS_ERR(smem->minidump))
+ dev_dbg(&pdev->dev, "failed to register minidump device\n");
+
return 0;
}
static int qcom_smem_remove(struct platform_device *pdev)
{
platform_device_unregister(__smem->socinfo);
+ platform_device_unregister(__smem->minidump);
hwspin_lock_free(__smem->hwlock);
__smem = NULL;
(END)
-------------------->cut<-----------------------
> --Mukesh
>>
>> thanks,
>> Srini
>>
>>> be shared among above qcom_minidump.c and qcom_common.c but since
>>> they are not in same directory, moved it inside include/soc/qcom/ as
>>> separate header than consumer header minidump.h . >
>>> -Mukesh
>>>>
>>>> --srini
>>>>
>>>>> Qualcomm drivers.
>>>>>
>>>>> There is no change in functional behavior after this.
>>>>>
>>>>> Signed-off-by: Mukesh Ojha <quic_mojha@...cinc.com>
>>>>> ---
>>>>> drivers/remoteproc/qcom_common.c | 56
>>>>> +---------------------------------
>>>>> include/soc/qcom/qcom_minidump.h | 66
>>>>> ++++++++++++++++++++++++++++++++++++++++
>>>>> 2 files changed, 67 insertions(+), 55 deletions(-)
>>>>> create mode 100644 include/soc/qcom/qcom_minidump.h
>>>>>
>>>>> diff --git a/drivers/remoteproc/qcom_common.c
>>>>> b/drivers/remoteproc/qcom_common.c
>>>>> index 805e525..88fc984 100644
>>>>> --- a/drivers/remoteproc/qcom_common.c
>>>>> +++ b/drivers/remoteproc/qcom_common.c
>>>>> @@ -18,6 +18,7 @@
>>>>> #include <linux/slab.h>
>>>>> #include <linux/soc/qcom/mdt_loader.h>
>>>>> #include <linux/soc/qcom/smem.h>
>>>>> +#include <soc/qcom/qcom_minidump.h>
>>>>> #include "remoteproc_internal.h"
>>>>> #include "qcom_common.h"
>>>>> @@ -26,61 +27,6 @@
>>>>> #define to_smd_subdev(d) container_of(d, struct
>>>>> qcom_rproc_subdev, subdev)
>>>>> #define to_ssr_subdev(d) container_of(d, struct qcom_rproc_ssr,
>>>>> subdev)
>>>>> -#define MAX_NUM_OF_SS 10
>>>>> -#define MAX_REGION_NAME_LENGTH 16
>>>>> -#define SBL_MINIDUMP_SMEM_ID 602
>>>>> -#define MINIDUMP_REGION_VALID ('V' << 24 | 'A' << 16 | 'L'
>>>>> << 8 | 'I' << 0)
>>>>> -#define MINIDUMP_SS_ENCR_DONE ('D' << 24 | 'O' << 16 | 'N'
>>>>> << 8 | 'E' << 0)
>>>>> -#define MINIDUMP_SS_ENABLED ('E' << 24 | 'N' << 16 | 'B' <<
>>>>> 8 | 'L' << 0)
>>>>> -
>>>>> -/**
>>>>> - * struct minidump_region - Minidump region
>>>>> - * @name : Name of the region to be dumped
>>>>> - * @seq_num: : Use to differentiate regions with same name.
>>>>> - * @valid : This entry to be dumped (if set to 1)
>>>>> - * @address : Physical address of region to be dumped
>>>>> - * @size : Size of the region
>>>>> - */
>>>>> -struct minidump_region {
>>>>> - char name[MAX_REGION_NAME_LENGTH];
>>>>> - __le32 seq_num;
>>>>> - __le32 valid;
>>>>> - __le64 address;
>>>>> - __le64 size;
>>>>> -};
>>>>> -
>>>>> -/**
>>>>> - * struct minidump_subsystem - Subsystem's SMEM Table of content
>>>>> - * @status : Subsystem toc init status
>>>>> - * @enabled : if set to 1, this region would be copied during
>>>>> coredump
>>>>> - * @encryption_status: Encryption status for this subsystem
>>>>> - * @encryption_required : Decides to encrypt the subsystem regions
>>>>> or not
>>>>> - * @region_count : Number of regions added in this subsystem toc
>>>>> - * @regions_baseptr : regions base pointer of the subsystem
>>>>> - */
>>>>> -struct minidump_subsystem {
>>>>> - __le32 status;
>>>>> - __le32 enabled;
>>>>> - __le32 encryption_status;
>>>>> - __le32 encryption_required;
>>>>> - __le32 region_count;
>>>>> - __le64 regions_baseptr;
>>>>> -};
>>>>> -
>>>>> -/**
>>>>> - * struct minidump_global_toc - Global Table of Content
>>>>> - * @status : Global Minidump init status
>>>>> - * @md_revision : Minidump revision
>>>>> - * @enabled : Minidump enable status
>>>>> - * @subsystems : Array of subsystems toc
>>>>> - */
>>>>> -struct minidump_global_toc {
>>>>> - __le32 status;
>>>>> - __le32 md_revision;
>>>>> - __le32 enabled;
>>>>> - struct minidump_subsystem subsystems[MAX_NUM_OF_SS];
>>>>> -};
>>>>> -
>>>>> struct qcom_ssr_subsystem {
>>>>> const char *name;
>>>>> struct srcu_notifier_head notifier_list;
>>>>> diff --git a/include/soc/qcom/qcom_minidump.h
>>>>> b/include/soc/qcom/qcom_minidump.h
>>>>> new file mode 100644
>>>>> index 0000000..84c8605
>>>>> --- /dev/null
>>>>> +++ b/include/soc/qcom/qcom_minidump.h
>>>>> @@ -0,0 +1,66 @@
>>>>> +/* SPDX-License-Identifier: GPL-2.0-only */
>>>>> +/*
>>>>> + * Qualcomm minidump shared data structures and macros
>>>>> + *
>>>>> + * Copyright (c) 2023 Qualcomm Innovation Center, Inc. All rights
>>>>> reserved.
>>>>> + */
>>>>> +
>>>>> +#ifndef _QCOM_MINIDUMP_H_
>>>>> +#define _QCOM_MINIDUMP_H_
>>>>> +
>>>>> +#define MAX_NUM_OF_SS 10
>>>>> +#define MAX_REGION_NAME_LENGTH 16
>>>>> +#define SBL_MINIDUMP_SMEM_ID 602
>>>>> +#define MINIDUMP_REGION_VALID ('V' << 24 | 'A' << 16 | 'L'
>>>>> << 8 | 'I' << 0)
>>>>> +#define MINIDUMP_SS_ENCR_DONE ('D' << 24 | 'O' << 16 | 'N'
>>>>> << 8 | 'E' << 0)
>>>>> +#define MINIDUMP_SS_ENABLED ('E' << 24 | 'N' << 16 | 'B' <<
>>>>> 8 | 'L' << 0)
>>>>> +
>>>>> +/**
>>>>> + * struct minidump_region - Minidump region
>>>>> + * @name : Name of the region to be dumped
>>>>> + * @seq_num: : Use to differentiate regions with same name.
>>>>> + * @valid : This entry to be dumped (if set to 1)
>>>>> + * @address : Physical address of region to be dumped
>>>>> + * @size : Size of the region
>>>>> + */
>>>>> +struct minidump_region {
>>>>> + char name[MAX_REGION_NAME_LENGTH];
>>>>> + __le32 seq_num;
>>>>> + __le32 valid;
>>>>> + __le64 address;
>>>>> + __le64 size;
>>>>> +};
>>>>> +
>>>>> +/**
>>>>> + * struct minidump_subsystem - Subsystem's SMEM Table of content
>>>>> + * @status : Subsystem toc init status
>>>>> + * @enabled : if set to 1, this region would be copied during
>>>>> coredump
>>>>> + * @encryption_status: Encryption status for this subsystem
>>>>> + * @encryption_required : Decides to encrypt the subsystem regions
>>>>> or not
>>>>> + * @region_count : Number of regions added in this subsystem toc
>>>>> + * @regions_baseptr : regions base pointer of the subsystem
>>>>> + */
>>>>> +struct minidump_subsystem {
>>>>> + __le32 status;
>>>>> + __le32 enabled;
>>>>> + __le32 encryption_status;
>>>>> + __le32 encryption_required;
>>>>> + __le32 region_count;
>>>>> + __le64 regions_baseptr;
>>>>> +};
>>>>> +
>>>>> +/**
>>>>> + * struct minidump_global_toc - Global Table of Content
>>>>> + * @status : Global Minidump init status
>>>>> + * @md_revision : Minidump revision
>>>>> + * @enabled : Minidump enable status
>>>>> + * @subsystems : Array of subsystems toc
>>>>> + */
>>>>> +struct minidump_global_toc {
>>>>> + __le32 status;
>>>>> + __le32 md_revision;
>>>>> + __le32 enabled;
>>>>> + struct minidump_subsystem subsystems[MAX_NUM_OF_SS];
>>>>> +};
>>>>> +
>>>>> +#endif /* _QCOM_MINIDUMP_H_ */
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