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drm/xe/pat: Determine ATS / PTA programming during early sw init

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Decide whether programming of the special ATS and PTA PAT entries is
necessary (and which entries should be programmed) during early software
initialization rather than hardcoding this into the 'program' functions.
Future platforms may want to re-use the same functions but utilize
different special entry values.  Consolidating all of the decisions
into one place keeps things simple.

Reviewed-by: Tejas Upadhyay <tejas.upadhyay@intel.com>
Link: https://lore.kernel.org/r/20250613214751.792066-3-matthew.d.roper@intel.com
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
This commit is contained in:
Matt Roper
2025-06-13 14:47:52 -07:00
parent 3ee9f2058a
commit 564e1a82fb
2 changed files with 21 additions and 8 deletions
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4
drivers/gpu/drm/xe/xe_device_types.h
View File

@@ -502,6 +502,10 @@ struct xe_device {
const struct xe_pat_table_entry *table;
/** @pat.n_entries: Number of PAT entries */
int n_entries;
/** @pat.ats_entry: PAT entry for PCIe ATS responses */
const struct xe_pat_table_entry *pat_ats;
/** @pat.pta_entry: PAT entry for page table accesses */
const struct xe_pat_table_entry *pat_pta;
u32 idx[__XE_CACHE_LEVEL_COUNT];
} pat;

25
drivers/gpu/drm/xe/xe_pat.c
View File

@@ -307,21 +307,27 @@ static const struct xe_pat_ops xelpg_pat_ops = {
static void xe2lpg_program_pat(struct xe_gt *gt, const struct xe_pat_table_entry table[],
int n_entries)
{
program_pat_mcr(gt, table, n_entries);
xe_gt_mcr_multicast_write(gt, XE_REG_MCR(_PAT_ATS), xe2_pat_ats.value);
struct xe_device *xe = gt_to_xe(gt);
if (IS_DGFX(gt_to_xe(gt)))
xe_gt_mcr_multicast_write(gt, XE_REG_MCR(_PAT_PTA), xe2_pat_pta.value);
program_pat_mcr(gt, table, n_entries);
if (xe->pat.pat_ats)
xe_gt_mcr_multicast_write(gt, XE_REG_MCR(_PAT_ATS), xe->pat.pat_ats->value);
if (xe->pat.pat_pta)
xe_gt_mcr_multicast_write(gt, XE_REG_MCR(_PAT_PTA), xe->pat.pat_pta->value);
}
static void xe2lpm_program_pat(struct xe_gt *gt, const struct xe_pat_table_entry table[],
int n_entries)
{
program_pat(gt, table, n_entries);
xe_mmio_write32(&gt->mmio, XE_REG(_PAT_ATS), xe2_pat_ats.value);
struct xe_device *xe = gt_to_xe(gt);
if (IS_DGFX(gt_to_xe(gt)))
xe_mmio_write32(&gt->mmio, XE_REG(_PAT_PTA), xe2_pat_pta.value);
program_pat(gt, table, n_entries);
if (xe->pat.pat_ats)
xe_mmio_write32(&gt->mmio, XE_REG(_PAT_ATS), xe->pat.pat_ats->value);
if (xe->pat.pat_pta)
xe_mmio_write32(&gt->mmio, XE_REG(_PAT_PTA), xe->pat.pat_pta->value);
}
static void xe2_dump(struct xe_gt *gt, struct drm_printer *p)
@@ -386,6 +392,9 @@ void xe_pat_init_early(struct xe_device *xe)
if (GRAPHICS_VER(xe) == 30 || GRAPHICS_VER(xe) == 20) {
xe->pat.ops = &xe2_pat_ops;
xe->pat.table = xe2_pat_table;
xe->pat.pat_ats = &xe2_pat_ats;
if (IS_DGFX(xe))
xe->pat.pat_pta = &xe2_pat_pta;
/* Wa_16023588340. XXX: Should use XE_WA */
if (GRAPHICS_VERx100(xe) == 2001)