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cxl: Support the cxl kernel API from a guest

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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>
This commit is contained in:
Frederic Barrat
2016-03-04 12:26:40 +01:00
committed by Michael Ellerman
parent b40844aa55
commit d601ea918b
7 changed files with 202 additions and 109 deletions
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5
include/misc/cxl.h
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@@ -210,4 +210,9 @@ ssize_t cxl_fd_read(struct file *file, char __user *buf, size_t count,
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 */