cxl: Support the cxl kernel API from a guest
Like on bare-metal, the cxl driver creates a virtual PHB and a pci
device for the AFU. The configuration space of the device is mapped to
the configuration record of the AFU.
Reuse the code defined in afu_cr_read8|16|32() when reading the
configuration space of the AFU device.
Even though the (virtual) AFU device is a pci device, the adapter is
not. So a driver using the cxl kernel API cannot read the VPD of the
adapter through the usual PCI interface. Therefore, we add a call to
the cxl kernel API:
ssize_t cxl_read_adapter_vpd(struct pci_dev *dev, void *buf, size_t count);
Co-authored-by: Christophe Lombard <clombard@linux.vnet.ibm.com>
Signed-off-by: Frederic Barrat <fbarrat@linux.vnet.ibm.com>
Signed-off-by: Christophe Lombard <clombard@linux.vnet.ibm.com>
Reviewed-by: Manoj Kumar <manoj@linux.vnet.ibm.com>
Acked-by: Ian Munsie <imunsie@au1.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
diff --git a/include/misc/cxl.h b/include/misc/cxl.h
index f2ffe5b..5bcf11a 100644
--- a/include/misc/cxl.h
+++ b/include/misc/cxl.h
@@ -210,4 +210,9 @@
void cxl_perst_reloads_same_image(struct cxl_afu *afu,
bool perst_reloads_same_image);
+/*
+ * Read the VPD for the card where the AFU resides
+ */
+ssize_t cxl_read_adapter_vpd(struct pci_dev *dev, void *buf, size_t count);
+
#endif /* _MISC_CXL_H */