stuartl/linux-mainline
1
0
Fork 0
mirror of https://kernel.googlesource.com/pub/scm/linux/kernel/git/torvalds/linux synced 2025-10-01 13:20:36 +10:00
Code Issues Releases Wiki Activity

drm/xe/pf: Set VF LMEM BAR size

Browse Source 
LMEM is partitioned between multiple VFs and we expect that the more
VFs we have, the less LMEM is assigned to each VF.
This means that we can achieve full LMEM BAR access without the need to
attempt full VF LMEM BAR resize via pci_resize_resource().

Always try to set the largest possible BAR size that allows to fit the
number of enabled VFs and inform the user in case the resize attempt is
not successful.

Signed-off-by: Michał Winiarski <michal.winiarski@intel.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Link: https://lore.kernel.org/r/20250527120637.665506-7-michal.winiarski@intel.com
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
(cherry picked from commit 32a4d1b98e6663101fd0abfaf151c48feea7abb1)
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
This commit is contained in:
Michał Winiarski 2025-05-27 14:06:37 +02:00 committed by Rodrigo Vivi
parent 55d49f0616
commit 94eae6ee4c
No known key found for this signature in database
GPG Key ID: FA625F640EEB13CA
2 changed files with 23 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/gpu/drm/xe/regs/xe_bars.h
View File

@ -7,5 +7,6 @@
#define GTTMMADR_BAR 0 /* MMIO + GTT */
#define LMEM_BAR 2 /* VRAM */
#define VF_LMEM_BAR 9 /* VF VRAM */
#endif

22
drivers/gpu/drm/xe/xe_pci_sriov.c
View File

@ -3,6 +3,10 @@
* Copyright © 2023-2024 Intel Corporation
*/
#include <linux/bitops.h>
#include <linux/pci.h>
#include "regs/xe_bars.h"
#include "xe_assert.h"
#include "xe_device.h"
#include "xe_gt_sriov_pf_config.h"
@ -128,6 +132,18 @@ static void pf_engine_activity_stats(struct xe_device *xe, unsigned int num_vfs,
}
}
static int resize_vf_vram_bar(struct xe_device *xe, int num_vfs)
{
struct pci_dev *pdev = to_pci_dev(xe->drm.dev);
u32 sizes;
sizes = pci_iov_vf_bar_get_sizes(pdev, VF_LMEM_BAR, num_vfs);
if (!sizes)
return 0;
return pci_iov_vf_bar_set_size(pdev, VF_LMEM_BAR, __fls(sizes));
}
static int pf_enable_vfs(struct xe_device *xe, int num_vfs)
{
struct pci_dev *pdev = to_pci_dev(xe->drm.dev);
@ -158,6 +174,12 @@ static int pf_enable_vfs(struct xe_device *xe, int num_vfs)
if (err < 0)
goto failed;
if (IS_DGFX(xe)) {
err = resize_vf_vram_bar(xe, num_vfs);
if (err)
xe_sriov_info(xe, "Failed to set VF LMEM BAR size: %d\n", err);
}
err = pci_enable_sriov(pdev, num_vfs);
if (err < 0)
goto failed;