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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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9
drivers/misc/cxl/pci.c
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@@ -881,6 +881,7 @@ static void cxl_pci_remove_afu(struct cxl_afu *afu)
if (!afu)
return;
cxl_pci_vphb_remove(afu);
cxl_sysfs_afu_remove(afu);
cxl_debugfs_afu_remove(afu);
@@ -1067,6 +1068,11 @@ static int cxl_vsec_looks_ok(struct cxl *adapter, struct pci_dev *dev)
return 0;
}
ssize_t cxl_pci_read_adapter_vpd(struct cxl *adapter, void *buf, size_t len)
{
return pci_read_vpd(to_pci_dev(adapter->dev.parent), 0, len, buf);
}
static void cxl_release_adapter(struct device *dev)
{
struct cxl *adapter = to_cxl_adapter(dev);
@@ -1272,7 +1278,6 @@ static void cxl_remove(struct pci_dev *dev)
*/
for (i = 0; i < adapter->slices; i++) {
afu = adapter->afu[i];
cxl_pci_vphb_remove(afu);
cxl_pci_remove_afu(afu);
}
cxl_pci_remove_adapter(adapter);
@@ -1451,8 +1456,6 @@ static pci_ers_result_t cxl_pci_slot_reset(struct pci_dev *pdev)
if (cxl_afu_select_best_mode(afu))
goto err;
cxl_pci_vphb_reconfigure(afu);
list_for_each_entry(afu_dev, &afu->phb->bus->devices, bus_list) {
/* Reset the device context.
* TODO: make this less disruptive