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From: "Dey, Megha" <megha.dey@linux.intel.com>
To: Thomas Gleixner <tglx@linutronix.de>,
	Dave Jiang <dave.jiang@intel.com>,
	vkoul@kernel.org, maz@kernel.org, bhelgaas@google.com,
	rafael@kernel.org, gregkh@linuxfoundation.org, hpa@zytor.com,
	alex.williamson@redhat.com, jacob.jun.pan@intel.com,
	ashok.raj@intel.com, jgg@mellanox.com, yi.l.liu@intel.com,
	baolu.lu@intel.com, kevin.tian@intel.com,
	sanjay.k.kumar@intel.com, tony.luck@intel.com,
	jing.lin@intel.com, dan.j.williams@intel.com,
	kwankhede@nvidia.com, eric.auger@redhat.com, parav@mellanox.com
Cc: dmaengine@vger.kernel.org, linux-kernel@vger.kernel.org,
	x86@kernel.org, linux-pci@vger.kernel.org, kvm@vger.kernel.org
Subject: Re: [PATCH RFC 03/15] drivers/base: Allocate/free platform-msi interrupts by group
Date: Sun, 3 May 2020 17:08:45 -0700	[thread overview]
Message-ID: <b6d3e623-55c3-fac4-96ca-d10c42782794@linux.intel.com> (raw)
In-Reply-To: <87sggrtg2z.fsf@nanos.tec.linutronix.de>

Hi Thomas,

On 4/25/2020 2:23 PM, Thomas Gleixner wrote:
> Dave Jiang <dave.jiang@intel.com> writes:
>> From: Megha Dey <megha.dey@linux.intel.com>
>> --- a/include/linux/msi.h
>> +++ b/include/linux/msi.h
>> @@ -135,6 +135,12 @@ enum platform_msi_type {
>>   	GEN_PLAT_MSI = 1,
>>   };
>>   
>> +struct platform_msi_group_entry {
>> +	unsigned int group_id;
>> +	struct list_head group_list;
>> +	struct list_head entry_list;
> 
> I surely told you before that struct members want to be written tabular.

yep, you surely did :) I will use tabs henceforth!
> 
>> +};
>> +
>>   /* Helpers to hide struct msi_desc implementation details */
>>   #define msi_desc_to_dev(desc)		((desc)->dev)
>>   #define dev_to_msi_list(dev)		(&(dev)->msi_list)
>> @@ -145,21 +151,31 @@ enum platform_msi_type {
>>   #define for_each_msi_entry_safe(desc, tmp, dev)	\
>>   	list_for_each_entry_safe((desc), (tmp), dev_to_msi_list((dev)), list)
>>   
>> -#define dev_to_platform_msi_list(dev)	(&(dev)->platform_msi_list)
>> -#define first_platform_msi_entry(dev)		\
>> -	list_first_entry(dev_to_platform_msi_list((dev)), struct msi_desc, list)
>> -#define for_each_platform_msi_entry(desc, dev)	\
>> -	list_for_each_entry((desc), dev_to_platform_msi_list((dev)), list)
>> -#define for_each_platform_msi_entry_safe(desc, tmp, dev)	\
>> -	list_for_each_entry_safe((desc), (tmp), dev_to_platform_msi_list((dev)), list)
>> +#define dev_to_platform_msi_group_list(dev)    (&(dev)->platform_msi_list)
>> +
>> +#define first_platform_msi_group_entry(dev)				\
>> +	list_first_entry(dev_to_platform_msi_group_list((dev)),		\
>> +			 struct platform_msi_group_entry, group_list)
>>   
>> -#define first_msi_entry_common(dev)	\
>> -	list_first_entry_select((dev)->platform_msi_type, dev_to_platform_msi_list((dev)),	\
>> +#define platform_msi_current_group_entry_list(dev)			\
>> +	(&((list_last_entry(dev_to_platform_msi_group_list((dev)),	\
>> +			    struct platform_msi_group_entry,		\
>> +			    group_list))->entry_list))
>> +
>> +#define first_msi_entry_current_group(dev)				\
>> +	list_first_entry_select((dev)->platform_msi_type,		\
>> +				platform_msi_current_group_entry_list((dev)),	\
>>   				dev_to_msi_list((dev)), struct msi_desc, list)
>>   
>> -#define for_each_msi_entry_common(desc, dev)	\
>> -	list_for_each_entry_select((dev)->platform_msi_type, desc, dev_to_platform_msi_list((dev)), \
>> -				   dev_to_msi_list((dev)), list)	\
>> +#define for_each_msi_entry_current_group(desc, dev)			\
>> +	list_for_each_entry_select((dev)->platform_msi_type, desc,	\
>> +				   platform_msi_current_group_entry_list((dev)),\
>> +				   dev_to_msi_list((dev)), list)
>> +
>> +#define for_each_platform_msi_entry_in_group(desc, platform_msi_group, group, dev)	\
>> +	list_for_each_entry((platform_msi_group), dev_to_platform_msi_group_list((dev)), group_list)	\
>> +		if (((platform_msi_group)->group_id) == (group))			\
>> +			list_for_each_entry((desc), (&(platform_msi_group)->entry_list), list)
> 
> Yet more unreadable macro maze to obfuscate what the code is actually
> doing.

hmm I will i guess add some more documentation either in the commit 
message or somewhere in documentation to make it clearer about the 
purpose of these macros.

> 
>>   /* When an MSI domain is used as an intermediate domain */
>>   int msi_domain_prepare_irqs(struct irq_domain *domain, struct device *dev,
>> diff --git a/kernel/irq/msi.c b/kernel/irq/msi.c
>> index bc5f9e32387f..899ade394ec8 100644
>> --- a/kernel/irq/msi.c
>> +++ b/kernel/irq/msi.c
>> @@ -320,7 +320,7 @@ int msi_domain_populate_irqs(struct irq_domain *domain, struct device *dev,
>>   	struct msi_desc *desc;
>>   	int ret = 0;
>>   
>> -	for_each_msi_entry_common(desc, dev) {
>> +	for_each_msi_entry_current_group(desc, dev) {
> 
> How is anyone supposed to figure out what the heck this means without
> going through several layers of macro maze and some magic type/group
> storage in struct device?
> 

Point noted. I think I am better off committing smaller logical changes 
in each patch.

> Again, function arguments exist for a reason.

ok makes sense, I will do this in the next version.

> 
> Thanks,
> 
>          tglx
> 

  reply	other threads:[~2020-05-04  0:08 UTC|newest]

Thread overview: 89+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-04-21 23:33 [PATCH RFC 00/15] Add VFIO mediated device support and IMS support for the idxd driver Dave Jiang
2020-04-21 23:33 ` [PATCH RFC 01/15] drivers/base: Introduce platform_msi_ops Dave Jiang
2020-04-26  7:01   ` Greg KH
2020-04-27 21:38     ` Dave Jiang
2020-04-28  7:34       ` Greg KH
2020-04-21 23:33 ` [PATCH RFC 02/15] drivers/base: Introduce a new platform-msi list Dave Jiang
2020-04-25 21:13   ` Thomas Gleixner
2020-05-04  0:08     ` Dey, Megha
2020-04-21 23:34 ` [PATCH RFC 03/15] drivers/base: Allocate/free platform-msi interrupts by group Dave Jiang
2020-04-25 21:23   ` Thomas Gleixner
2020-05-04  0:08     ` Dey, Megha [this message]
2020-04-21 23:34 ` [PATCH RFC 04/15] drivers/base: Add support for a new IMS irq domain Dave Jiang
2020-04-23 20:11   ` Jason Gunthorpe
2020-05-01 22:30     ` Dey, Megha
2020-05-03 22:25       ` Jason Gunthorpe
2020-05-03 22:40         ` Dey, Megha
2020-05-03 22:46           ` Jason Gunthorpe
2020-05-04  0:25             ` Dey, Megha
2020-05-04 12:14               ` Jason Gunthorpe
2020-05-06 10:27                 ` Tian, Kevin
2020-04-25 21:38   ` Thomas Gleixner
2020-05-04  0:11     ` Dey, Megha
2020-04-21 23:34 ` [PATCH RFC 05/15] ims-msi: Add mask/unmask routines Dave Jiang
2020-04-25 21:49   ` Thomas Gleixner
2020-05-04  0:16     ` Dey, Megha
2020-04-21 23:34 ` [PATCH RFC 06/15] ims-msi: Enable IMS interrupts Dave Jiang
2020-04-25 22:13   ` Thomas Gleixner
2020-05-04  0:17     ` Dey, Megha
2020-04-21 23:34 ` [PATCH RFC 07/15] Documentation: Interrupt Message store Dave Jiang
2020-04-23 20:04   ` Jason Gunthorpe
2020-05-01 22:32     ` Dey, Megha
2020-05-03 22:28       ` Jason Gunthorpe
2020-05-03 22:41         ` Dey, Megha
2020-04-21 23:34 ` [PATCH RFC 08/15] vfio/mdev: Add a member for iommu domain in mdev_device Dave Jiang
2020-04-21 23:34 ` [PATCH RFC 09/15] vfio/type1: Save domain when attach domain to mdev Dave Jiang
2020-04-21 23:34 ` [PATCH RFC 10/15] dmaengine: idxd: add config support for readonly devices Dave Jiang
2020-04-21 23:34 ` [PATCH RFC 11/15] dmaengine: idxd: add IMS support in base driver Dave Jiang
2020-04-21 23:35 ` [PATCH RFC 12/15] dmaengine: idxd: add device support functions in prep for mdev Dave Jiang
2020-04-21 23:35 ` [PATCH RFC 13/15] dmaengine: idxd: add support for VFIO mediated device Dave Jiang
2020-04-21 23:35 ` [PATCH RFC 14/15] dmaengine: idxd: add error notification from host driver to " Dave Jiang
2020-04-21 23:35 ` [PATCH RFC 15/15] dmaengine: idxd: add ABI documentation for mediated device support Dave Jiang
2020-04-21 23:54 ` [PATCH RFC 00/15] Add VFIO mediated device support and IMS support for the idxd driver Jason Gunthorpe
2020-04-22  0:53   ` Tian, Kevin
2020-04-22 11:50     ` Jason Gunthorpe
2020-04-22 21:14       ` Raj, Ashok
2020-04-23 19:12         ` Jason Gunthorpe
2020-04-24  3:27           ` Tian, Kevin
2020-04-24 12:44             ` Jason Gunthorpe
2020-04-24 16:25               ` Tian, Kevin
2020-04-24 18:12                 ` Jason Gunthorpe
2020-04-26  5:18                   ` Tian, Kevin
2020-04-26 19:13                     ` Jason Gunthorpe
2020-04-27  3:43                       ` Alex Williamson
2020-04-27 11:58                         ` Jason Gunthorpe
2020-04-27 13:19                           ` Alex Williamson
2020-04-27 13:22                             ` Jason Gunthorpe
2020-04-27 14:18                               ` Alex Williamson
2020-04-27 14:25                                 ` Jason Gunthorpe
2020-04-27 15:41                                   ` Alex Williamson
2020-04-27 16:16                                     ` Jason Gunthorpe
2020-04-27 16:25                                       ` Dave Jiang
2020-04-27 21:56                                         ` Jason Gunthorpe
2020-04-29  9:42                               ` Tian, Kevin
2020-05-08 20:47                                 ` Raj, Ashok
2020-05-08 23:16                                   ` Jason Gunthorpe
2020-05-08 23:52                                     ` Dave Jiang
2020-05-09  0:09                                     ` Raj, Ashok
2020-05-09 12:21                                       ` Jason Gunthorpe
2020-05-13  2:29                                         ` Jason Wang
2020-05-13  8:30                                         ` Tian, Kevin
2020-05-13 12:40                                           ` Jason Gunthorpe
2020-04-27 12:13                       ` Tian, Kevin
2020-04-27 12:55                         ` Jason Gunthorpe
2020-04-22 21:24   ` Dan Williams
2020-04-23 19:17     ` Dan Williams
2020-04-23 19:49       ` Jason Gunthorpe
2020-05-01 22:31         ` Dey, Megha
2020-05-03 22:21           ` Jason Gunthorpe
2020-05-03 22:32             ` Dey, Megha
2020-04-23 19:18     ` Jason Gunthorpe
2020-05-01 22:31       ` Dey, Megha
2020-05-03 22:22         ` Jason Gunthorpe
2020-05-03 22:31           ` Dey, Megha
2020-05-03 22:36             ` Jason Gunthorpe
2020-05-04  0:20               ` Dey, Megha
2020-04-22 23:04   ` Dey, Megha
2020-04-23 19:44     ` Jason Gunthorpe
2020-05-01 22:32       ` Dey, Megha
2020-04-24  6:31   ` Jason Wang

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