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authorOleksandr Tyshchenko <oleksandr_tyshchenko@epam.com>2022-06-02 22:23:52 +0300
committerJuergen Gross <jgross@suse.com>2022-06-06 17:07:30 +0300
commit625ab90ecdf7770bda7ae21c4d5c938aa9b43bb4 (patch)
tree6992c0524fa71479bdc60df7cdd6080f5e270621 /include/xen
parent1ca55d50e50c74747a7b8846dac306fbe5ac4cf5 (diff)
downloadlinux-625ab90ecdf7770bda7ae21c4d5c938aa9b43bb4.tar.xz
xen/grant-dma-ops: Retrieve the ID of backend's domain for DT devices
Use the presence of "iommus" property pointed to the IOMMU node with recently introduced "xen,grant-dma" compatible as a clear indicator of enabling Xen grant mappings scheme for that device and read the ID of Xen domain where the corresponding backend is running. The domid (domain ID) is used as an argument to the Xen grant mapping APIs. To avoid the deferred probe timeout which takes place after reusing generic IOMMU device tree bindings (because the IOMMU device never becomes available) enable recently introduced stub IOMMU driver by selecting XEN_GRANT_DMA_IOMMU. Also introduce xen_is_grant_dma_device() to check whether xen-grant DMA ops need to be set for a passed device. Remove the hardcoded domid 0 in xen_grant_setup_dma_ops(). Signed-off-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com> Reviewed-by: Stefano Stabellini <sstabellini@kernel.org> Link: https://lore.kernel.org/r/1654197833-25362-8-git-send-email-olekstysh@gmail.com Signed-off-by: Juergen Gross <jgross@suse.com>
Diffstat (limited to 'include/xen')
-rw-r--r--include/xen/xen-ops.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/include/xen/xen-ops.h b/include/xen/xen-ops.h
index afd586d717a4..80546960f8b7 100644
--- a/include/xen/xen-ops.h
+++ b/include/xen/xen-ops.h
@@ -216,10 +216,15 @@ static inline void xen_preemptible_hcall_end(void) { }
#ifdef CONFIG_XEN_GRANT_DMA_OPS
void xen_grant_setup_dma_ops(struct device *dev);
+bool xen_is_grant_dma_device(struct device *dev);
#else
static inline void xen_grant_setup_dma_ops(struct device *dev)
{
}
+static inline bool xen_is_grant_dma_device(struct device *dev)
+{
+ return false;
+}
#endif /* CONFIG_XEN_GRANT_DMA_OPS */
#endif /* INCLUDE_XEN_OPS_H */