From: Suman Anna <s-anna@ti.com>
To: Loic PALLARDY <loic.pallardy@st.com>,
"bjorn.andersson@linaro.org" <bjorn.andersson@linaro.org>,
"ohad@wizery.com" <ohad@wizery.com>
Cc: "linux-remoteproc@vger.kernel.org"
<linux-remoteproc@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
Arnaud POULIQUEN <arnaud.pouliquen@st.com>,
"benjamin.gaignard@linaro.org" <benjamin.gaignard@linaro.org>
Subject: Re: [PATCH v4 10/17] remoteproc: add helper function to check carveout device address
Date: Thu, 25 Oct 2018 17:50:07 -0500 [thread overview]
Message-ID: <5e86ac7e-e0db-205e-1c60-bc0be9f75859@ti.com> (raw)
In-Reply-To: <8b16461d7d99487480253cde5cdcfd2c@SFHDAG7NODE2.st.com>
Hi Loic,
On 10/24/18 10:24 AM, Loic PALLARDY wrote:
> Hi Suman,
>
>> -----Original Message-----
>> From: Suman Anna <s-anna@ti.com>
>> Sent: mercredi 24 octobre 2018 00:14
>> To: Loic PALLARDY <loic.pallardy@st.com>; bjorn.andersson@linaro.org;
>> ohad@wizery.com
>> Cc: linux-remoteproc@vger.kernel.org; linux-kernel@vger.kernel.org;
>> Arnaud POULIQUEN <arnaud.pouliquen@st.com>;
>> benjamin.gaignard@linaro.org
>> Subject: Re: [PATCH v4 10/17] remoteproc: add helper function to check
>> carveout device address
>>
>> Hi Loic,
>>
>> On 7/27/18 8:14 AM, Loic Pallardy wrote:
>>> This patch introduces a function to verify that a specified carveout
>>> is fitting request device address and associated length
>>>
>>> Signed-off-by: Loic Pallardy <loic.pallardy@st.com>
>>> ---
>>> drivers/remoteproc/remoteproc_core.c | 47
>> ++++++++++++++++++++++++++++++++++++
>>> 1 file changed, 47 insertions(+)
>>>
>>> diff --git a/drivers/remoteproc/remoteproc_core.c
>> b/drivers/remoteproc/remoteproc_core.c
>>> index 1e0fe3e..5dd5edf 100644
>>> --- a/drivers/remoteproc/remoteproc_core.c
>>> +++ b/drivers/remoteproc/remoteproc_core.c
>>> @@ -259,6 +259,53 @@ struct rproc_mem_entry *
>>> return mem;
>>> }
>>>
>>> +/**
>>> + * rproc_check_carveout_da() - Check specified carveout da configuration
>>> + * @rproc: handle of a remote processor
>>> + * @mem: pointer on carveout to check
>>> + * @da: area device address
>>> + * @len: associated area size
>>> + *
>>> + * This function is a helper function to verify requested device area
>> (couple
>>> + * da, len) is part of specified carevout.
>>
>> %s/carevout/carveout/
> OK
>>
>>> + *
>>> + * Return: 0 if carveout matchs request else -ENOMEM
>>
>> %s/matchs/matches/
> OK
>>
>>> + */
>>> +int rproc_check_carveout_da(struct rproc *rproc, struct
>> rproc_mem_entry *mem,
>>
>> static int since this seems to be only a local function.
> OK
>>
>>> + u32 da, u32 len)
>>> +{
>>> + struct device *dev = &rproc->dev;
>>> + int delta = 0;
>>> +
>>> + /* Check requested resource length */
>>> + if (len > mem->len) {
>>> + dev_err(dev, "Registered carveout doesn't fit len
>> request\n");
>>> + return -ENOMEM;
>>
>> ENOMEM not typically used for these kind of errors, you were probably
>> inclined to used this since it is dealing with memory.
>
> -EINVAL will be better
>>
>>> + }
>>> +
>>
>> Both the below codepaths are exercised only when da is not
>> FW_RSC_ADDR_ANY, and you are returning 0 otherwise (which is the case of
>> matches as per your description above). Is that what you really want -
>> should it be an error
>
> Yes when da is equal to FW_RSC_ADDR_ANY we should check the length too
Can you update the comments in the function description accordingly as
well, the current code silently returns 0 if da = FW_RSC_ADDR_ANY.
>
>>
>>> + if (da != FW_RSC_ADDR_ANY && mem->da == FW_RSC_ADDR_ANY)
>> {
>>> + /* Update existing carveout da */
>>> + mem->da = da;
>>
>> Where would you need to update this?
> In that case, we have 2 carveouts with the same name.
> One has some fixed requests. The other one has none.
> The goal here is to align both on the one which has the strongest requirements.
> I think length is missing.
It almost looks like there is a need for range overlap checks on all the
carveouts after all of them are registered, and error out if any overlap
irrespective of the name schema.
regards
Suman
>
> Regards,
> Loic
>
>>
>> regards
>> Suman
>>
>>> + } else if (da != FW_RSC_ADDR_ANY && mem->da !=
>> FW_RSC_ADDR_ANY) {
>>> + delta = da - mem->da;
>>> +
>>> + /* Check requested resource belongs to registered carveout
>> */
>>> + if (delta < 0) {
>>> + dev_err(dev,
>>> + "Registered carveout doesn't fit da
>> request\n");
>>> + return -ENOMEM;
>>> + }
>>> +
>>> + if (delta + len > mem->len) {
>>> + dev_err(dev,
>>> + "Registered carveout doesn't fit len
>> request\n");
>>> + return -ENOMEM;
>>> + }
>>> + }
>>> +
>>> + return 0;
>>
>>
>>> +}
>>> +
>>> int rproc_alloc_vring(struct rproc_vdev *rvdev, int i)
>>> {
>>> struct rproc *rproc = rvdev->rproc;
>>>
>
next prev parent reply other threads:[~2018-10-25 22:50 UTC|newest]
Thread overview: 75+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-07-27 13:14 [PATCH v4 00/17] remoteproc: add fixed memory region support Loic Pallardy
2018-07-27 13:14 ` [PATCH v4 01/17] remoteproc: configure IOMMU only if device address requested Loic Pallardy
2018-10-23 17:25 ` Suman Anna
2018-10-23 19:40 ` Loic PALLARDY
2018-10-24 3:46 ` Suman Anna
2018-10-24 12:56 ` Loic PALLARDY
2018-10-26 0:46 ` Suman Anna
2018-07-27 13:14 ` [PATCH v4 02/17] remoteproc: add rproc_va_to_pa function Loic Pallardy
2018-10-23 16:50 ` Suman Anna
2018-10-23 19:51 ` Loic PALLARDY
2018-10-24 3:19 ` Suman Anna
2018-10-24 12:58 ` Loic PALLARDY
2018-10-25 22:50 ` Suman Anna
2018-07-27 13:14 ` [PATCH v4 03/17] remoteproc: add release ops in rproc_mem_entry struct Loic Pallardy
2018-10-23 16:53 ` Suman Anna
2018-10-23 20:48 ` Suman Anna
2018-07-27 13:14 ` [PATCH v4 04/17] remoteproc: add name " Loic Pallardy
2018-10-23 17:06 ` Suman Anna
2018-07-27 13:14 ` [PATCH v4 05/17] remoteproc: add helper function to allocate and init " Loic Pallardy
2018-10-23 19:24 ` Suman Anna
2018-07-27 13:14 ` [PATCH v4 06/17] remoteproc: introduce rproc_add_carveout function Loic Pallardy
2018-10-23 17:05 ` Suman Anna
2018-10-23 19:48 ` Loic PALLARDY
2018-07-27 13:14 ` [PATCH v4 07/17] remoteproc: introduce rproc_find_carveout_by_name function Loic Pallardy
2018-10-23 19:28 ` Suman Anna
2018-07-27 13:14 ` [PATCH v4 08/17] remoteproc: add alloc ops in rproc_mem_entry struct Loic Pallardy
2018-10-23 21:20 ` Suman Anna
2018-10-24 16:00 ` Loic PALLARDY
2018-10-25 22:37 ` Suman Anna
2018-07-27 13:14 ` [PATCH v4 09/17] remoteproc: add helper function to allocate rproc_mem_entry from reserved memory Loic Pallardy
2018-07-27 13:14 ` [PATCH v4 10/17] remoteproc: add helper function to check carveout device address Loic Pallardy
2018-10-23 22:14 ` Suman Anna
2018-10-24 15:24 ` Loic PALLARDY
2018-10-25 22:50 ` Suman Anna [this message]
2018-07-27 13:14 ` [PATCH v4 11/17] remoteproc: modify rproc_handle_carveout to support pre-registered region Loic Pallardy
2018-07-27 13:14 ` [PATCH v4 12/17] remoteproc: modify vring allocation to rely on centralized carveout allocator Loic Pallardy
2018-10-10 5:32 ` Bjorn Andersson
2018-10-10 18:58 ` Loic PALLARDY
2018-10-15 6:40 ` Bjorn Andersson
2018-10-23 23:24 ` Suman Anna
2018-10-24 0:14 ` Suman Anna
2018-10-24 15:14 ` Loic PALLARDY
2018-10-29 20:17 ` Suman Anna
2018-12-04 17:56 ` Wendy Liang
2018-12-04 18:04 ` Loic PALLARDY
2018-12-04 18:58 ` Wendy Liang
2018-12-04 19:57 ` Loic PALLARDY
2018-12-04 21:24 ` Wendy Liang
2018-07-27 13:14 ` [PATCH v4 13/17] remoteproc: create vdev subdevice with specific dma memory pool Loic Pallardy
2018-09-27 17:17 ` Wendy Liang
2018-09-27 19:22 ` Loic PALLARDY
2018-09-27 20:18 ` Wendy Liang
2018-10-24 1:22 ` Suman Anna
2018-10-24 1:48 ` Suman Anna
2018-10-24 12:42 ` Loic PALLARDY
2018-10-25 22:06 ` Suman Anna
2018-10-24 12:40 ` Loic PALLARDY
2018-10-25 20:16 ` Suman Anna
2018-10-10 5:58 ` Bjorn Andersson
2018-10-10 19:17 ` Loic PALLARDY
2018-10-24 1:27 ` Suman Anna
2018-07-27 13:14 ` [PATCH v4 14/17] remoteproc: keystone: declare reserved memory region for vdev device Loic Pallardy
2018-07-27 13:14 ` [PATCH v4 15/17] remoteproc: da8xx: " Loic Pallardy
2018-10-24 2:57 ` Suman Anna
2018-10-24 13:19 ` Loic PALLARDY
2018-10-25 22:11 ` Suman Anna
2018-07-27 13:14 ` [PATCH v4 16/17] remoteproc: st: add reserved memory support Loic Pallardy
2018-10-24 3:01 ` Suman Anna
2018-10-24 12:37 ` Loic PALLARDY
2018-07-27 13:14 ` [PATCH v4 17/17] rpmsg: virtio: allocate buffer from parent Loic Pallardy
2018-09-28 7:56 ` Anup Patel
2018-09-21 6:04 ` [PATCH v4 00/17] remoteproc: add fixed memory region support Anup Patel
2018-09-26 16:00 ` Loic PALLARDY
2018-09-28 7:54 ` Anup Patel
2018-10-23 16:42 ` Suman Anna
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