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| author | Marcin Bernatowicz <marcin.bernatowicz@linux.intel.com> | 2026-09-18 13:01:30 +0200 |
|---|---|---|
| committer | Rodrigo Vivi <rodrigo.vivi@intel.com> | 2026-09-28 10:19:35 -0400 |
| commit | 72207463f7a4a6818a88f4ef57802b42da534301 (patch) | |
| tree | 8d23b1ec906291bd56f928e18ac14bc14ba9c65d | |
| parent | 74dae5f33c0c64d3ca12710bfd845721d73fe2e5 (diff) | |
| download | linux-stable-72207463f7a4a6818a88f4ef57802b42da534301.tar.gz linux-stable-72207463f7a4a6818a88f4ef57802b42da534301.zip | |
drm/xe/pf: Keep VF LMEM BAR size low if no VFs enabled
When VFs are enabled on dGFX the driver resizes the PF VF_LMEM_BAR to
fit the requested layout. After VFs are disabled the PF VF BAR
size is left as-is. On platforms with tight MMIO apertures a
subsequent unplug/rescan followed by another enable may fail with:
"VF BAR …: can't assign; no space"
because the PCI core reserves address space based on the (now large) VF
template, often multiplied by totalvfs.
Closes: https://gitlab.freedesktop.org/drm/xe/kernel/-/issues/5937
Fixes: 94eae6ee4c2d ("drm/xe/pf: Set VF LMEM BAR size")
Signed-off-by: Marcin Bernatowicz <marcin.bernatowicz@linux.intel.com>
Cc: Michał Wajdeczko <michal.wajdeczko@intel.com>
Cc: Michał Winiarski <michal.winiarski@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patch.msgid.link/20260918110130.700332-1-marcin.bernatowicz@linux.intel.com
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
(cherry picked from commit 0646547a67d25c407f5a4ac71b4eefe8b941202b)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
| -rw-r--r-- | drivers/gpu/drm/xe/xe_pci_sriov.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/gpu/drm/xe/xe_pci_sriov.c b/drivers/gpu/drm/xe/xe_pci_sriov.c index c023a2a1f..31abcee55 100644 --- a/drivers/gpu/drm/xe/xe_pci_sriov.c +++ b/drivers/gpu/drm/xe/xe_pci_sriov.c @@ -177,6 +177,7 @@ static int pf_enable_vfs(struct xe_device *xe, int num_vfs) return num_vfs; failed: + pf_resize_vf_vram_bar(xe, xe->sriov.pf.device_total_vfs); xe_sriov_pf_unprovision_vfs(xe, num_vfs); xe_pm_runtime_put(xe); pf_finish_vfs_enabling(xe); @@ -204,6 +205,8 @@ static int pf_disable_vfs(struct xe_device *xe) pci_disable_sriov(pdev); + pf_resize_vf_vram_bar(xe, xe->sriov.pf.device_total_vfs); + xe_sriov_pf_reprovision_default(xe); pf_reset_vfs(xe, num_vfs); |