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drm/xe/configfs: Allow adding configurations for future VFs

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Since we are expecting that all configuration directory names
will match some of the existing devices, we can't provide any
configuration for the VFs until they are actually enabled.

But we can relax that restriction by just checking if there
is a PF device that could create given VF. This is easy since
all our PF devices are always present at function 0 and we can
query PF device for number of VFs it could support.

Then for some system with PF device at 0000:00:02.0 we can add
configs for all VFs:

  /sys/kernel/config/xe/
  ├── 0000:00:02.0
  │   └── ...
  ├── 0000:00:02.1
  │   └── ...
  ├── 0000:00:02.2
  │   └── ...
  :
  └── 0000:00:02.7
      └── ...

Signed-off-by: Michal Wajdeczko <michal.wajdeczko@intel.com>
Cc: John Harrison <John.C.Harrison@Intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Link: https://lore.kernel.org/r/20250731212145.179898-1-michal.wajdeczko@intel.com
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
This commit is contained in:
Michal Wajdeczko 2025-07-31 23:21:45 +02:00 committed by Lucas De Marchi
parent b4687422c3
commit ca0ed3b10f
1 changed files with 30 additions and 3 deletions
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33
drivers/gpu/drm/xe/xe_configfs.c
View File

@ -12,9 +12,9 @@
#include <linux/string.h>
#include "xe_configfs.h"
#include "xe_module.h"
#include "xe_hw_engine_types.h"
#include "xe_module.h"
#include "xe_pci_types.h"
/**
* DOC: Xe Configfs
@ -280,6 +280,15 @@ static const struct xe_device_desc *xe_match_desc(struct pci_dev *pdev)
return found ? (const void *)found->driver_data : NULL;
}
static struct pci_dev *get_physfn_instead(struct pci_dev *virtfn)
{
struct pci_dev *physfn = pci_physfn(virtfn);
pci_dev_get(physfn);
pci_dev_put(virtfn);
return physfn;
}
static struct config_group *xe_config_make_device_group(struct config_group *group,
const char *name)
{
@ -288,6 +297,7 @@ static struct config_group *xe_config_make_device_group(struct config_group *gro
const struct xe_device_desc *match;
struct pci_dev *pdev;
char canonical[16];
int vfnumber = 0;
int ret;
ret = sscanf(name, "%x:%x:%x.%x", &domain, &bus, &slot, &function);
@ -301,12 +311,29 @@ static struct config_group *xe_config_make_device_group(struct config_group *gro
return ERR_PTR(-EINVAL);
pdev = pci_get_domain_bus_and_slot(domain, bus, PCI_DEVFN(slot, function));
if (!pdev && function)
pdev = pci_get_domain_bus_and_slot(domain, bus, PCI_DEVFN(slot, 0));
if (!pdev && slot)
pdev = pci_get_domain_bus_and_slot(domain, bus, PCI_DEVFN(0, 0));
if (!pdev)
return ERR_PTR(-ENODEV);
if (PCI_DEVFN(slot, function) != pdev->devfn) {
pdev = get_physfn_instead(pdev);
vfnumber = PCI_DEVFN(slot, function) - pdev->devfn;
if (!dev_is_pf(&pdev->dev) || vfnumber > pci_sriov_get_totalvfs(pdev)) {
pci_dev_put(pdev);
return ERR_PTR(-ENODEV);
}
}
match = xe_match_desc(pdev);
if (!match)
if (match && vfnumber && !match->has_sriov) {
pci_info(pdev, "xe driver does not support VFs on this device\n");
match = NULL;
} else if (!match) {
pci_info(pdev, "xe driver does not support configuration of this device\n");
}
pci_dev_put(pdev);