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Re: [PATCH v3 0/8] xen/arm: Add support for SMMUv3 driver
- To: Rahul Singh <rahul.singh@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- From: Julien Grall <julien@xxxxxxx>
- Date: Fri, 11 Dec 2020 14:29:27 +0000
- Cc: bertrand.marquis@xxxxxxx, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Ian Jackson <iwj@xxxxxxxxxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Wei Liu <wl@xxxxxxx>, Paul Durrant <paul@xxxxxxx>
- Delivery-date: Fri, 11 Dec 2020 14:29:37 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
Hi Rahul,
On 10/12/2020 16:56, Rahul Singh wrote:
This patch series is v3 of the work to add support for the SMMUv3 driver.
Approach taken is to first merge the Linux copy of the SMMUv3 driver
(tag v5.8.18) and then modify the driver to build on XEN.
MSI and PCI ATS functionality are not supported. Code is not tested and
compiled. Code is guarded by the flag CONFIG_PCI_ATS and CONFIG_MSI to compile
the driver.
Code specific to Linux is removed from the driver to avoid dead code.
Driver is currently supported as tech preview.
Following functionality should be supported before driver is out for tech
preview
1. Investigate the timing analysis of using spin lock in place of mutex when
attaching a device to SMMU.
2. Merged the latest Linux SMMUv3 driver code once atomic operation is
available in XEN.
3. PCI ATS and MSI interrupts should be supported.
4. Investigate side-effect of using tasklet in place of threaded IRQ and fix
if any.
In your last e-mail, you wrote that you would investigate and then come
back to use. It wasn't clear that this meant you will not deal with it
in this series.
5. fallthorugh keyword should be supported.
This one should really be done now... It is not a complicated one...
6. Implement the ffsll function in bitops.h file.
... same here.
Cheers,
--
Julien Grall
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