Re: [RFC PATCH v3 4/7] bus/cdx: add cdx-MSI domain with gic-its domain as parent
From: Jason Gunthorpe <jgg@nvidia.com>
Date: 2022-09-06 17:28:23
Also in:
kvm, linux-arm-kernel, linux-kbuild, lkml
Possibly related (same subject, not in this thread)
- 2022-09-09 · RE: [RFC PATCH v3 4/7] bus/cdx: add cdx-MSI domain with gic-its domain as parent · "Gupta, Nipun" <Nipun.Gupta@amd.com>
- 2022-09-08 · Re: [RFC PATCH v3 4/7] bus/cdx: add cdx-MSI domain with gic-its domain as parent · Robin Murphy <robin.murphy@arm.com>
- 2022-09-08 · RE: [RFC PATCH v3 4/7] bus/cdx: add cdx-MSI domain with gic-its domain as parent · Radovanovic, Aleksandar <hidden>
- 2022-09-07 · RE: [RFC PATCH v3 4/7] bus/cdx: add cdx-MSI domain with gic-its domain as parent · Radovanovic, Aleksandar <hidden>
On Tue, Sep 06, 2022 at 07:17:58PM +0530, Nipun Gupta wrote:
+static void cdx_msi_write_msg(struct irq_data *irq_data,
+ struct msi_msg *msg)
+{
+ /*
+ * Do nothing as CDX devices have these pre-populated
+ * in the hardware itself.
+ */
+}Huh? There is no way it can be pre-populated, the addr/data pair, especially on ARM, is completely under SW control. There is some commonly used IOVA base in Linux for the ITS page, but no HW should hardwire that. Jason