drm/xe: Move 'va_bits' flag back to platform descriptor

The number of virtual address bits is something that should be tracked
at the platform level rather than the IP level.  Even when mixing and
matching various graphics, media, and display IP blocks, the platform as
a whole has to have consistent page table handling.  This is also a
trait that should be tied to the platform even if the graphics IP itself
is not present (e.g., if we disable the primary GT via configfs).

v2:
 - Drop the default value of 48 and explicitly set it in each relevant
   descriptor.  (Lucas, Michal)
v3:
 - Drop an outdated comment about default value.  (Michal)

Cc: Lucas De Marchi <lucas.demarchi@intel.com>
Cc: Michal Wajdeczko <michal.wajdeczko@intel.com>
Reviewed-by: Lucas De Marchi <lucas.demarchi@intel.com>
Link: https://lore.kernel.org/r/20251013200944.2499947-28-matthew.d.roper@intel.com
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>

2 files changed, 16 insertions, 7 deletions

diff --git a/drivers/gpu/drm/xe/xe_pci.c b/drivers/gpu/drm/xe/xe_pci.c
index e706b2808553..e0e3249045a2 100644
--- a/drivers/gpu/drm/xe/xe_pci.c
+++ b/drivers/gpu/drm/xe/xe_pci.c
@@ -52,13 +52,11 @@ __diag_ignore_all("-Woverride-init", "Allow field overrides in table");
 static const struct xe_graphics_desc graphics_xelp = {
 	.hw_engine_mask = BIT(XE_HW_ENGINE_RCS0) | BIT(XE_HW_ENGINE_BCS0),
 
-	.va_bits = 48,
 	.vm_max_level = 3,
 };
 
 #define XE_HP_FEATURES \
 	.has_range_tlb_inval = true, \
-	.va_bits = 48, \
 	.vm_max_level = 3
 
 static const struct xe_graphics_desc graphics_xehpg = {
@@ -84,7 +82,6 @@ static const struct xe_graphics_desc graphics_xehpc = {
 		BIT(XE_HW_ENGINE_CCS2) | BIT(XE_HW_ENGINE_CCS3),
 
 	XE_HP_FEATURES,
-	.va_bits = 57,
 	.vm_max_level = 4,
 	.vram_flags = XE_VRAM_FLAGS_NEED64K,
 
@@ -108,7 +105,6 @@ static const struct xe_graphics_desc graphics_xelpg = {
 	.has_range_tlb_inval = 1, \
 	.has_usm = 1, \
 	.has_64bit_timestamp = 1, \
-	.va_bits = 48, \
 	.vm_max_level = 4, \
 	.hw_engine_mask = \
 		BIT(XE_HW_ENGINE_RCS0) | \
@@ -174,6 +170,7 @@ static const struct xe_device_desc tgl_desc = {
 	.has_sriov = true,
 	.max_gt_per_tile = 1,
 	.require_force_probe = true,
+	.va_bits = 48,
 };
 
 static const struct xe_device_desc rkl_desc = {
@@ -185,6 +182,7 @@ static const struct xe_device_desc rkl_desc = {
 	.has_llc = true,
 	.max_gt_per_tile = 1,
 	.require_force_probe = true,
+	.va_bits = 48,
 };
 
 static const u16 adls_rpls_ids[] = { INTEL_RPLS_IDS(NOP), 0 };
@@ -203,6 +201,7 @@ static const struct xe_device_desc adl_s_desc = {
 		{ XE_SUBPLATFORM_ALDERLAKE_S_RPLS, "RPLS", adls_rpls_ids },
 		{},
 	},
+	.va_bits = 48,
 };
 
 static const u16 adlp_rplu_ids[] = { INTEL_RPLU_IDS(NOP), 0 };
@@ -221,6 +220,7 @@ static const struct xe_device_desc adl_p_desc = {
 		{ XE_SUBPLATFORM_ALDERLAKE_P_RPLU, "RPLU", adlp_rplu_ids },
 		{},
 	},
+	.va_bits = 48,
 };
 
 static const struct xe_device_desc adl_n_desc = {
@@ -233,6 +233,7 @@ static const struct xe_device_desc adl_n_desc = {
 	.has_sriov = true,
 	.max_gt_per_tile = 1,
 	.require_force_probe = true,
+	.va_bits = 48,
 };
 
 #define DGFX_FEATURES \
@@ -249,6 +250,7 @@ static const struct xe_device_desc dg1_desc = {
 	.has_heci_gscfi = 1,
 	.max_gt_per_tile = 1,
 	.require_force_probe = true,
+	.va_bits = 48,
 };
 
 static const u16 dg2_g10_ids[] = { INTEL_DG2_G10_IDS(NOP), INTEL_ATS_M150_IDS(NOP), 0 };
@@ -265,7 +267,8 @@ static const u16 dg2_g12_ids[] = { INTEL_DG2_G12_IDS(NOP), 0 };
 		{ XE_SUBPLATFORM_DG2_G11, "G11", dg2_g11_ids }, \
 		{ XE_SUBPLATFORM_DG2_G12, "G12", dg2_g12_ids }, \
 		{ } \
-	}
+	}, \
+	.va_bits = 48
 
 static const struct xe_device_desc ats_m_desc = {
 	.pre_gmdid_graphics_ip = &graphics_ip_xehpg,
@@ -303,6 +306,7 @@ static const __maybe_unused struct xe_device_desc pvc_desc = {
 	.max_gt_per_tile = 1,
 	.max_remote_tiles = 1,
 	.require_force_probe = true,
+	.va_bits = 57,
 	.has_mbx_power_limits = false,
 };
 
@@ -314,6 +318,7 @@ static const struct xe_device_desc mtl_desc = {
 	.has_display = true,
 	.has_pxp = true,
 	.max_gt_per_tile = 2,
+	.va_bits = 48,
 };
 
 static const struct xe_device_desc lnl_desc = {
@@ -323,6 +328,7 @@ static const struct xe_device_desc lnl_desc = {
 	.has_pxp = true,
 	.max_gt_per_tile = 2,
 	.needs_scratch = true,
+	.va_bits = 48,
 };
 
 static const struct xe_device_desc bmg_desc = {
@@ -338,6 +344,7 @@ static const struct xe_device_desc bmg_desc = {
 	.has_sriov = true,
 	.max_gt_per_tile = 2,
 	.needs_scratch = true,
+	.va_bits = 48,
 };
 
 static const struct xe_device_desc ptl_desc = {
@@ -348,6 +355,7 @@ static const struct xe_device_desc ptl_desc = {
 	.max_gt_per_tile = 2,
 	.needs_scratch = true,
 	.needs_shared_vf_gt_wq = true,
+	.va_bits = 48,
 };
 
 #undef PLATFORM
@@ -583,6 +591,8 @@ static int xe_info_init_early(struct xe_device *xe,
 		subplatform_desc->subplatform : XE_SUBPLATFORM_NONE;
 
 	xe->info.dma_mask_size = desc->dma_mask_size;
+	xe->info.va_bits = desc->va_bits;
+
 	xe->info.is_dgfx = desc->is_dgfx;
 	xe->info.has_fan_control = desc->has_fan_control;
 	xe->info.has_mbx_power_limits = desc->has_mbx_power_limits;
@@ -713,7 +723,6 @@ static int xe_info_init(struct xe_device *xe,
 	}
 
 	xe->info.vram_flags = graphics_desc->vram_flags;
-	xe->info.va_bits = graphics_desc->va_bits;
 	xe->info.vm_max_level = graphics_desc->vm_max_level;
 	xe->info.has_asid = graphics_desc->has_asid;
 	xe->info.has_atomic_enable_pte_bit = graphics_desc->has_atomic_enable_pte_bit;
diff --git a/drivers/gpu/drm/xe/xe_pci_types.h b/drivers/gpu/drm/xe/xe_pci_types.h
index b11bf6abda5b..7c27e3742aa7 100644
--- a/drivers/gpu/drm/xe/xe_pci_types.h
+++ b/drivers/gpu/drm/xe/xe_pci_types.h
@@ -30,6 +30,7 @@ struct xe_device_desc {
 	u8 dma_mask_size;
 	u8 max_remote_tiles:2;
 	u8 max_gt_per_tile:2;
+	u8 va_bits;
 
 	u8 require_force_probe:1;
 	u8 is_dgfx:1;
@@ -52,7 +53,6 @@ struct xe_device_desc {
 };
 
 struct xe_graphics_desc {
-	u8 va_bits;
 	u8 vm_max_level;
 	u8 vram_flags;