Revert "drm/xe/pf: Set VF LMEM BAR size"

JIRA: https://issues.redhat.com/browse/RHEL-113577
Upstream Status: RHEL only

This reverts commit 94eae6e.

This commit was backported automatically as part of the DRM backport.

The pci_iov_vf_bar_get_sizes() and pci_iov_vf_bar_set_size() helpers
are not present in this tree. Backporting them would require backport
other changes such as pci_resource_is_iov(),
pci_iov_is_memory_decoding_enabled(), pci_iov_resource_set_size() and
possible others. Revert this instead.

NOTE: This commit does not compile due to missing RHEL-specific fix-ups,
which are split out into separate Git commits following this one.

If git bisect selected this commit, run "git bisect skip" and try again.
Repeat this until it selects a commit which compiles.

Signed-off-by: José Expósito <jexposit@redhat.com>

Author: jexposit

drivers/gpu/drm/xe/regs/xe_bars.h

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

drivers/gpu/drm/xe/xe_pci_sriov.c

@@ -3,10 +3,6 @@
  * 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"
@@ -132,18 +128,6 @@ 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);
@@ -174,12 +158,6 @@ 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;