[PATCH 3/5] drm/xe: Promote VRAM initialization function to own file
Michal Wajdeczko
michal.wajdeczko at intel.com
Mon May 27 17:35:52 UTC 2024
There is no point in mixing MMIO and VRAM code in the same file.
Move and rename the VRAM probe function to a new file (there are
no other changes other then simple kernel-doc).
Signed-off-by: Michal Wajdeczko <michal.wajdeczko at intel.com>
Cc: Matt Roper <matthew.d.roper at intel.com>
---
drivers/gpu/drm/xe/Makefile | 1 +
drivers/gpu/drm/xe/xe_device.c | 3 +-
drivers/gpu/drm/xe/xe_mmio.c | 333 +------------------------------
drivers/gpu/drm/xe/xe_vram.c | 350 +++++++++++++++++++++++++++++++++
drivers/gpu/drm/xe/xe_vram.h | 13 ++
5 files changed, 368 insertions(+), 332 deletions(-)
create mode 100644 drivers/gpu/drm/xe/xe_vram.c
create mode 100644 drivers/gpu/drm/xe/xe_vram.h
diff --git a/drivers/gpu/drm/xe/Makefile b/drivers/gpu/drm/xe/Makefile
index d5b137e762ed..74bd64d9e8ab 100644
--- a/drivers/gpu/drm/xe/Makefile
+++ b/drivers/gpu/drm/xe/Makefile
@@ -143,6 +143,7 @@ xe-y += xe_bb.o \
xe_uc_debugfs.o \
xe_uc_fw.o \
xe_vm.o \
+ xe_vram.o \
xe_vram_freq.o \
xe_wait_user_fence.o \
xe_wa.o \
diff --git a/drivers/gpu/drm/xe/xe_device.c b/drivers/gpu/drm/xe/xe_device.c
index f04b11e45c2d..61ec15f2034b 100644
--- a/drivers/gpu/drm/xe/xe_device.c
+++ b/drivers/gpu/drm/xe/xe_device.c
@@ -51,6 +51,7 @@
#include "xe_ttm_stolen_mgr.h"
#include "xe_ttm_sys_mgr.h"
#include "xe_vm.h"
+#include "xe_vram.h"
#include "xe_wait_user_fence.h"
static int xe_file_open(struct drm_device *dev, struct drm_file *file)
@@ -615,7 +616,7 @@ int xe_device_probe(struct xe_device *xe)
if (err)
goto err_irq_shutdown;
- err = xe_mmio_probe_vram(xe);
+ err = xe_vram_probe(xe);
if (err)
goto err_irq_shutdown;
diff --git a/drivers/gpu/drm/xe/xe_mmio.c b/drivers/gpu/drm/xe/xe_mmio.c
index 1272246dd8a3..7962eeb9adb7 100644
--- a/drivers/gpu/drm/xe/xe_mmio.c
+++ b/drivers/gpu/drm/xe/xe_mmio.c
@@ -8,348 +8,19 @@
#include <linux/delay.h>
#include <linux/io-64-nonatomic-lo-hi.h>
#include <linux/minmax.h>
+#include <linux/pci.h>
#include <drm/drm_managed.h>
-#include <drm/xe_drm.h>
+#include <drm/drm_print.h>
#include "regs/xe_bars.h"
-#include "regs/xe_engine_regs.h"
-#include "regs/xe_gt_regs.h"
#include "regs/xe_regs.h"
-#include "xe_bo.h"
#include "xe_device.h"
-#include "xe_force_wake.h"
-#include "xe_ggtt.h"
#include "xe_gt.h"
-#include "xe_gt_mcr.h"
#include "xe_gt_printk.h"
#include "xe_gt_sriov_vf.h"
#include "xe_macros.h"
-#include "xe_module.h"
#include "xe_sriov.h"
-#include "xe_tile.h"
-
-#define BAR_SIZE_SHIFT 20
-
-static void
-_resize_bar(struct xe_device *xe, int resno, resource_size_t size)
-{
- struct pci_dev *pdev = to_pci_dev(xe->drm.dev);
- int bar_size = pci_rebar_bytes_to_size(size);
- int ret;
-
- if (pci_resource_len(pdev, resno))
- pci_release_resource(pdev, resno);
-
- ret = pci_resize_resource(pdev, resno, bar_size);
- if (ret) {
- drm_info(&xe->drm, "Failed to resize BAR%d to %dM (%pe). Consider enabling 'Resizable BAR' support in your BIOS\n",
- resno, 1 << bar_size, ERR_PTR(ret));
- return;
- }
-
- drm_info(&xe->drm, "BAR%d resized to %dM\n", resno, 1 << bar_size);
-}
-
-/*
- * if force_vram_bar_size is set, attempt to set to the requested size
- * else set to maximum possible size
- */
-static void xe_resize_vram_bar(struct xe_device *xe)
-{
- u64 force_vram_bar_size = xe_modparam.force_vram_bar_size;
- struct pci_dev *pdev = to_pci_dev(xe->drm.dev);
- struct pci_bus *root = pdev->bus;
- resource_size_t current_size;
- resource_size_t rebar_size;
- struct resource *root_res;
- u32 bar_size_mask;
- u32 pci_cmd;
- int i;
-
- /* gather some relevant info */
- current_size = pci_resource_len(pdev, LMEM_BAR);
- bar_size_mask = pci_rebar_get_possible_sizes(pdev, LMEM_BAR);
-
- if (!bar_size_mask)
- return;
-
- /* set to a specific size? */
- if (force_vram_bar_size) {
- u32 bar_size_bit;
-
- rebar_size = force_vram_bar_size * (resource_size_t)SZ_1M;
-
- bar_size_bit = bar_size_mask & BIT(pci_rebar_bytes_to_size(rebar_size));
-
- if (!bar_size_bit) {
- drm_info(&xe->drm,
- "Requested size: %lluMiB is not supported by rebar sizes: 0x%x. Leaving default: %lluMiB\n",
- (u64)rebar_size >> 20, bar_size_mask, (u64)current_size >> 20);
- return;
- }
-
- rebar_size = 1ULL << (__fls(bar_size_bit) + BAR_SIZE_SHIFT);
-
- if (rebar_size == current_size)
- return;
- } else {
- rebar_size = 1ULL << (__fls(bar_size_mask) + BAR_SIZE_SHIFT);
-
- /* only resize if larger than current */
- if (rebar_size <= current_size)
- return;
- }
-
- drm_info(&xe->drm, "Attempting to resize bar from %lluMiB -> %lluMiB\n",
- (u64)current_size >> 20, (u64)rebar_size >> 20);
-
- while (root->parent)
- root = root->parent;
-
- pci_bus_for_each_resource(root, root_res, i) {
- if (root_res && root_res->flags & (IORESOURCE_MEM | IORESOURCE_MEM_64) &&
- (u64)root_res->start > 0x100000000ul)
- break;
- }
-
- if (!root_res) {
- drm_info(&xe->drm, "Can't resize VRAM BAR - platform support is missing. Consider enabling 'Resizable BAR' support in your BIOS\n");
- return;
- }
-
- pci_read_config_dword(pdev, PCI_COMMAND, &pci_cmd);
- pci_write_config_dword(pdev, PCI_COMMAND, pci_cmd & ~PCI_COMMAND_MEMORY);
-
- _resize_bar(xe, LMEM_BAR, rebar_size);
-
- pci_assign_unassigned_bus_resources(pdev->bus);
- pci_write_config_dword(pdev, PCI_COMMAND, pci_cmd);
-}
-
-static bool xe_pci_resource_valid(struct pci_dev *pdev, int bar)
-{
- if (!pci_resource_flags(pdev, bar))
- return false;
-
- if (pci_resource_flags(pdev, bar) & IORESOURCE_UNSET)
- return false;
-
- if (!pci_resource_len(pdev, bar))
- return false;
-
- return true;
-}
-
-static int xe_determine_lmem_bar_size(struct xe_device *xe)
-{
- struct pci_dev *pdev = to_pci_dev(xe->drm.dev);
-
- if (!xe_pci_resource_valid(pdev, LMEM_BAR)) {
- drm_err(&xe->drm, "pci resource is not valid\n");
- return -ENXIO;
- }
-
- xe_resize_vram_bar(xe);
-
- xe->mem.vram.io_start = pci_resource_start(pdev, LMEM_BAR);
- xe->mem.vram.io_size = pci_resource_len(pdev, LMEM_BAR);
- if (!xe->mem.vram.io_size)
- return -EIO;
-
- /* XXX: Need to change when xe link code is ready */
- xe->mem.vram.dpa_base = 0;
-
- /* set up a map to the total memory area. */
- xe->mem.vram.mapping = ioremap_wc(xe->mem.vram.io_start, xe->mem.vram.io_size);
-
- return 0;
-}
-
-static inline u64 get_flat_ccs_offset(struct xe_gt *gt, u64 tile_size)
-{
- struct xe_device *xe = gt_to_xe(gt);
- u64 offset;
- u32 reg;
-
- if (GRAPHICS_VER(xe) >= 20) {
- u64 ccs_size = tile_size / 512;
- u64 offset_hi, offset_lo;
- u32 nodes, num_enabled;
-
- reg = xe_mmio_read32(gt, MIRROR_FUSE3);
- nodes = REG_FIELD_GET(XE2_NODE_ENABLE_MASK, reg);
- num_enabled = hweight32(nodes); /* Number of enabled l3 nodes */
-
- reg = xe_gt_mcr_unicast_read_any(gt, XE2_FLAT_CCS_BASE_RANGE_LOWER);
- offset_lo = REG_FIELD_GET(XE2_FLAT_CCS_BASE_LOWER_ADDR_MASK, reg);
-
- reg = xe_gt_mcr_unicast_read_any(gt, XE2_FLAT_CCS_BASE_RANGE_UPPER);
- offset_hi = REG_FIELD_GET(XE2_FLAT_CCS_BASE_UPPER_ADDR_MASK, reg);
-
- offset = offset_hi << 32; /* HW view bits 39:32 */
- offset |= offset_lo << 6; /* HW view bits 31:6 */
- offset *= num_enabled; /* convert to SW view */
-
- /* We don't expect any holes */
- xe_assert_msg(xe, offset == (xe_mmio_read64_2x32(gt, GSMBASE) - ccs_size),
- "Hole between CCS and GSM.\n");
- } else {
- reg = xe_gt_mcr_unicast_read_any(gt, XEHP_FLAT_CCS_BASE_ADDR);
- offset = (u64)REG_FIELD_GET(XEHP_FLAT_CCS_PTR, reg) * SZ_64K;
- }
-
- return offset;
-}
-
-/**
- * xe_mmio_tile_vram_size() - Collect vram size and offset information
- * @tile: tile to get info for
- * @vram_size: available vram (size - device reserved portions)
- * @tile_size: actual vram size
- * @tile_offset: physical start point in the vram address space
- *
- * There are 4 places for size information:
- * - io size (from pci_resource_len of LMEM bar) (only used for small bar and DG1)
- * - TILEx size (actual vram size)
- * - GSMBASE offset (TILEx - "stolen")
- * - CSSBASE offset (TILEx - CSS space necessary)
- *
- * CSSBASE is always a lower/smaller offset then GSMBASE.
- *
- * The actual available size of memory is to the CCS or GSM base.
- * NOTE: multi-tile bases will include the tile offset.
- *
- */
-static int xe_mmio_tile_vram_size(struct xe_tile *tile, u64 *vram_size,
- u64 *tile_size, u64 *tile_offset)
-{
- struct xe_device *xe = tile_to_xe(tile);
- struct xe_gt *gt = tile->primary_gt;
- u64 offset;
- int err;
- u32 reg;
-
- err = xe_force_wake_get(gt_to_fw(gt), XE_FW_GT);
- if (err)
- return err;
-
- /* actual size */
- if (unlikely(xe->info.platform == XE_DG1)) {
- *tile_size = pci_resource_len(to_pci_dev(xe->drm.dev), LMEM_BAR);
- *tile_offset = 0;
- } else {
- reg = xe_gt_mcr_unicast_read_any(gt, XEHP_TILE_ADDR_RANGE(gt->info.id));
- *tile_size = (u64)REG_FIELD_GET(GENMASK(14, 8), reg) * SZ_1G;
- *tile_offset = (u64)REG_FIELD_GET(GENMASK(7, 1), reg) * SZ_1G;
- }
-
- /* minus device usage */
- if (xe->info.has_flat_ccs) {
- offset = get_flat_ccs_offset(gt, *tile_size);
- } else {
- offset = xe_mmio_read64_2x32(gt, GSMBASE);
- }
-
- /* remove the tile offset so we have just the available size */
- *vram_size = offset - *tile_offset;
-
- return xe_force_wake_put(gt_to_fw(gt), XE_FW_GT);
-}
-
-static void vram_fini(void *arg)
-{
- struct xe_device *xe = arg;
- struct xe_tile *tile;
- int id;
-
- if (xe->mem.vram.mapping)
- iounmap(xe->mem.vram.mapping);
-
- xe->mem.vram.mapping = NULL;
-
- for_each_tile(tile, xe, id)
- tile->mem.vram.mapping = NULL;
-}
-
-int xe_mmio_probe_vram(struct xe_device *xe)
-{
- struct xe_tile *tile;
- resource_size_t io_size;
- u64 available_size = 0;
- u64 total_size = 0;
- u64 tile_offset;
- u64 tile_size;
- u64 vram_size;
- int err;
- u8 id;
-
- if (!IS_DGFX(xe))
- return 0;
-
- /* Get the size of the root tile's vram for later accessibility comparison */
- tile = xe_device_get_root_tile(xe);
- err = xe_mmio_tile_vram_size(tile, &vram_size, &tile_size, &tile_offset);
- if (err)
- return err;
-
- err = xe_determine_lmem_bar_size(xe);
- if (err)
- return err;
-
- drm_info(&xe->drm, "VISIBLE VRAM: %pa, %pa\n", &xe->mem.vram.io_start,
- &xe->mem.vram.io_size);
-
- io_size = xe->mem.vram.io_size;
-
- /* tile specific ranges */
- for_each_tile(tile, xe, id) {
- err = xe_mmio_tile_vram_size(tile, &vram_size, &tile_size, &tile_offset);
- if (err)
- return err;
-
- tile->mem.vram.actual_physical_size = tile_size;
- tile->mem.vram.io_start = xe->mem.vram.io_start + tile_offset;
- tile->mem.vram.io_size = min_t(u64, vram_size, io_size);
-
- if (!tile->mem.vram.io_size) {
- drm_err(&xe->drm, "Tile without any CPU visible VRAM. Aborting.\n");
- return -ENODEV;
- }
-
- tile->mem.vram.dpa_base = xe->mem.vram.dpa_base + tile_offset;
- tile->mem.vram.usable_size = vram_size;
- tile->mem.vram.mapping = xe->mem.vram.mapping + tile_offset;
-
- if (tile->mem.vram.io_size < tile->mem.vram.usable_size)
- drm_info(&xe->drm, "Small BAR device\n");
- drm_info(&xe->drm, "VRAM[%u, %u]: Actual physical size %pa, usable size exclude stolen %pa, CPU accessible size %pa\n", id,
- tile->id, &tile->mem.vram.actual_physical_size, &tile->mem.vram.usable_size, &tile->mem.vram.io_size);
- drm_info(&xe->drm, "VRAM[%u, %u]: DPA range: [%pa-%llx], io range: [%pa-%llx]\n", id, tile->id,
- &tile->mem.vram.dpa_base, tile->mem.vram.dpa_base + (u64)tile->mem.vram.actual_physical_size,
- &tile->mem.vram.io_start, tile->mem.vram.io_start + (u64)tile->mem.vram.io_size);
-
- /* calculate total size using tile size to get the correct HW sizing */
- total_size += tile_size;
- available_size += vram_size;
-
- if (total_size > xe->mem.vram.io_size) {
- drm_info(&xe->drm, "VRAM: %pa is larger than resource %pa\n",
- &total_size, &xe->mem.vram.io_size);
- }
-
- io_size -= min_t(u64, tile_size, io_size);
- }
-
- xe->mem.vram.actual_physical_size = total_size;
-
- drm_info(&xe->drm, "Total VRAM: %pa, %pa\n", &xe->mem.vram.io_start,
- &xe->mem.vram.actual_physical_size);
- drm_info(&xe->drm, "Available VRAM: %pa, %pa\n", &xe->mem.vram.io_start,
- &available_size);
-
- return devm_add_action_or_reset(xe->drm.dev, vram_fini, xe);
-}
static void tiles_fini(void *arg)
{
diff --git a/drivers/gpu/drm/xe/xe_vram.c b/drivers/gpu/drm/xe/xe_vram.c
new file mode 100644
index 000000000000..d8b81e4e050c
--- /dev/null
+++ b/drivers/gpu/drm/xe/xe_vram.c
@@ -0,0 +1,350 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2021-2024 Intel Corporation
+ */
+
+#include <linux/pci.h>
+
+#include <drm/drm_managed.h>
+#include <drm/drm_print.h>
+
+#include "regs/xe_bars.h"
+#include "regs/xe_gt_regs.h"
+#include "regs/xe_regs.h"
+#include "xe_assert.h"
+#include "xe_device.h"
+#include "xe_force_wake.h"
+#include "xe_gt_mcr.h"
+#include "xe_mmio.h"
+#include "xe_module.h"
+#include "xe_vram.h"
+
+#define BAR_SIZE_SHIFT 20
+
+static void
+_resize_bar(struct xe_device *xe, int resno, resource_size_t size)
+{
+ struct pci_dev *pdev = to_pci_dev(xe->drm.dev);
+ int bar_size = pci_rebar_bytes_to_size(size);
+ int ret;
+
+ if (pci_resource_len(pdev, resno))
+ pci_release_resource(pdev, resno);
+
+ ret = pci_resize_resource(pdev, resno, bar_size);
+ if (ret) {
+ drm_info(&xe->drm, "Failed to resize BAR%d to %dM (%pe). Consider enabling 'Resizable BAR' support in your BIOS\n",
+ resno, 1 << bar_size, ERR_PTR(ret));
+ return;
+ }
+
+ drm_info(&xe->drm, "BAR%d resized to %dM\n", resno, 1 << bar_size);
+}
+
+/*
+ * if force_vram_bar_size is set, attempt to set to the requested size
+ * else set to maximum possible size
+ */
+static void xe_resize_vram_bar(struct xe_device *xe)
+{
+ u64 force_vram_bar_size = xe_modparam.force_vram_bar_size;
+ struct pci_dev *pdev = to_pci_dev(xe->drm.dev);
+ struct pci_bus *root = pdev->bus;
+ resource_size_t current_size;
+ resource_size_t rebar_size;
+ struct resource *root_res;
+ u32 bar_size_mask;
+ u32 pci_cmd;
+ int i;
+
+ /* gather some relevant info */
+ current_size = pci_resource_len(pdev, LMEM_BAR);
+ bar_size_mask = pci_rebar_get_possible_sizes(pdev, LMEM_BAR);
+
+ if (!bar_size_mask)
+ return;
+
+ /* set to a specific size? */
+ if (force_vram_bar_size) {
+ u32 bar_size_bit;
+
+ rebar_size = force_vram_bar_size * (resource_size_t)SZ_1M;
+
+ bar_size_bit = bar_size_mask & BIT(pci_rebar_bytes_to_size(rebar_size));
+
+ if (!bar_size_bit) {
+ drm_info(&xe->drm,
+ "Requested size: %lluMiB is not supported by rebar sizes: 0x%x. Leaving default: %lluMiB\n",
+ (u64)rebar_size >> 20, bar_size_mask, (u64)current_size >> 20);
+ return;
+ }
+
+ rebar_size = 1ULL << (__fls(bar_size_bit) + BAR_SIZE_SHIFT);
+
+ if (rebar_size == current_size)
+ return;
+ } else {
+ rebar_size = 1ULL << (__fls(bar_size_mask) + BAR_SIZE_SHIFT);
+
+ /* only resize if larger than current */
+ if (rebar_size <= current_size)
+ return;
+ }
+
+ drm_info(&xe->drm, "Attempting to resize bar from %lluMiB -> %lluMiB\n",
+ (u64)current_size >> 20, (u64)rebar_size >> 20);
+
+ while (root->parent)
+ root = root->parent;
+
+ pci_bus_for_each_resource(root, root_res, i) {
+ if (root_res && root_res->flags & (IORESOURCE_MEM | IORESOURCE_MEM_64) &&
+ (u64)root_res->start > 0x100000000ul)
+ break;
+ }
+
+ if (!root_res) {
+ drm_info(&xe->drm, "Can't resize VRAM BAR - platform support is missing. Consider enabling 'Resizable BAR' support in your BIOS\n");
+ return;
+ }
+
+ pci_read_config_dword(pdev, PCI_COMMAND, &pci_cmd);
+ pci_write_config_dword(pdev, PCI_COMMAND, pci_cmd & ~PCI_COMMAND_MEMORY);
+
+ _resize_bar(xe, LMEM_BAR, rebar_size);
+
+ pci_assign_unassigned_bus_resources(pdev->bus);
+ pci_write_config_dword(pdev, PCI_COMMAND, pci_cmd);
+}
+
+static bool xe_pci_resource_valid(struct pci_dev *pdev, int bar)
+{
+ if (!pci_resource_flags(pdev, bar))
+ return false;
+
+ if (pci_resource_flags(pdev, bar) & IORESOURCE_UNSET)
+ return false;
+
+ if (!pci_resource_len(pdev, bar))
+ return false;
+
+ return true;
+}
+
+static int xe_determine_lmem_bar_size(struct xe_device *xe)
+{
+ struct pci_dev *pdev = to_pci_dev(xe->drm.dev);
+
+ if (!xe_pci_resource_valid(pdev, LMEM_BAR)) {
+ drm_err(&xe->drm, "pci resource is not valid\n");
+ return -ENXIO;
+ }
+
+ xe_resize_vram_bar(xe);
+
+ xe->mem.vram.io_start = pci_resource_start(pdev, LMEM_BAR);
+ xe->mem.vram.io_size = pci_resource_len(pdev, LMEM_BAR);
+ if (!xe->mem.vram.io_size)
+ return -EIO;
+
+ /* XXX: Need to change when xe link code is ready */
+ xe->mem.vram.dpa_base = 0;
+
+ /* set up a map to the total memory area. */
+ xe->mem.vram.mapping = ioremap_wc(xe->mem.vram.io_start, xe->mem.vram.io_size);
+
+ return 0;
+}
+
+static inline u64 get_flat_ccs_offset(struct xe_gt *gt, u64 tile_size)
+{
+ struct xe_device *xe = gt_to_xe(gt);
+ u64 offset;
+ u32 reg;
+
+ if (GRAPHICS_VER(xe) >= 20) {
+ u64 ccs_size = tile_size / 512;
+ u64 offset_hi, offset_lo;
+ u32 nodes, num_enabled;
+
+ reg = xe_mmio_read32(gt, MIRROR_FUSE3);
+ nodes = REG_FIELD_GET(XE2_NODE_ENABLE_MASK, reg);
+ num_enabled = hweight32(nodes); /* Number of enabled l3 nodes */
+
+ reg = xe_gt_mcr_unicast_read_any(gt, XE2_FLAT_CCS_BASE_RANGE_LOWER);
+ offset_lo = REG_FIELD_GET(XE2_FLAT_CCS_BASE_LOWER_ADDR_MASK, reg);
+
+ reg = xe_gt_mcr_unicast_read_any(gt, XE2_FLAT_CCS_BASE_RANGE_UPPER);
+ offset_hi = REG_FIELD_GET(XE2_FLAT_CCS_BASE_UPPER_ADDR_MASK, reg);
+
+ offset = offset_hi << 32; /* HW view bits 39:32 */
+ offset |= offset_lo << 6; /* HW view bits 31:6 */
+ offset *= num_enabled; /* convert to SW view */
+
+ /* We don't expect any holes */
+ xe_assert_msg(xe, offset == (xe_mmio_read64_2x32(gt, GSMBASE) - ccs_size),
+ "Hole between CCS and GSM.\n");
+ } else {
+ reg = xe_gt_mcr_unicast_read_any(gt, XEHP_FLAT_CCS_BASE_ADDR);
+ offset = (u64)REG_FIELD_GET(XEHP_FLAT_CCS_PTR, reg) * SZ_64K;
+ }
+
+ return offset;
+}
+
+/**
+ * xe_mmio_tile_vram_size() - Collect vram size and offset information
+ * @tile: tile to get info for
+ * @vram_size: available vram (size - device reserved portions)
+ * @tile_size: actual vram size
+ * @tile_offset: physical start point in the vram address space
+ *
+ * There are 4 places for size information:
+ * - io size (from pci_resource_len of LMEM bar) (only used for small bar and DG1)
+ * - TILEx size (actual vram size)
+ * - GSMBASE offset (TILEx - "stolen")
+ * - CSSBASE offset (TILEx - CSS space necessary)
+ *
+ * CSSBASE is always a lower/smaller offset then GSMBASE.
+ *
+ * The actual available size of memory is to the CCS or GSM base.
+ * NOTE: multi-tile bases will include the tile offset.
+ *
+ */
+static int xe_mmio_tile_vram_size(struct xe_tile *tile, u64 *vram_size,
+ u64 *tile_size, u64 *tile_offset)
+{
+ struct xe_device *xe = tile_to_xe(tile);
+ struct xe_gt *gt = tile->primary_gt;
+ u64 offset;
+ int err;
+ u32 reg;
+
+ err = xe_force_wake_get(gt_to_fw(gt), XE_FW_GT);
+ if (err)
+ return err;
+
+ /* actual size */
+ if (unlikely(xe->info.platform == XE_DG1)) {
+ *tile_size = pci_resource_len(to_pci_dev(xe->drm.dev), LMEM_BAR);
+ *tile_offset = 0;
+ } else {
+ reg = xe_gt_mcr_unicast_read_any(gt, XEHP_TILE_ADDR_RANGE(gt->info.id));
+ *tile_size = (u64)REG_FIELD_GET(GENMASK(14, 8), reg) * SZ_1G;
+ *tile_offset = (u64)REG_FIELD_GET(GENMASK(7, 1), reg) * SZ_1G;
+ }
+
+ /* minus device usage */
+ if (xe->info.has_flat_ccs) {
+ offset = get_flat_ccs_offset(gt, *tile_size);
+ } else {
+ offset = xe_mmio_read64_2x32(gt, GSMBASE);
+ }
+
+ /* remove the tile offset so we have just the available size */
+ *vram_size = offset - *tile_offset;
+
+ return xe_force_wake_put(gt_to_fw(gt), XE_FW_GT);
+}
+
+static void vram_fini(void *arg)
+{
+ struct xe_device *xe = arg;
+ struct xe_tile *tile;
+ int id;
+
+ if (xe->mem.vram.mapping)
+ iounmap(xe->mem.vram.mapping);
+
+ xe->mem.vram.mapping = NULL;
+
+ for_each_tile(tile, xe, id)
+ tile->mem.vram.mapping = NULL;
+}
+
+/**
+ * xe_vram_probe() - Probe VRAM configuration
+ * @xe: the &xe_device
+ *
+ * Collect VRAM size and offset information for all tiles.
+ *
+ * Return: 0 on success, error code on failure
+ */
+int xe_vram_probe(struct xe_device *xe)
+{
+ struct xe_tile *tile;
+ resource_size_t io_size;
+ u64 available_size = 0;
+ u64 total_size = 0;
+ u64 tile_offset;
+ u64 tile_size;
+ u64 vram_size;
+ int err;
+ u8 id;
+
+ if (!IS_DGFX(xe))
+ return 0;
+
+ /* Get the size of the root tile's vram for later accessibility comparison */
+ tile = xe_device_get_root_tile(xe);
+ err = xe_mmio_tile_vram_size(tile, &vram_size, &tile_size, &tile_offset);
+ if (err)
+ return err;
+
+ err = xe_determine_lmem_bar_size(xe);
+ if (err)
+ return err;
+
+ drm_info(&xe->drm, "VISIBLE VRAM: %pa, %pa\n", &xe->mem.vram.io_start,
+ &xe->mem.vram.io_size);
+
+ io_size = xe->mem.vram.io_size;
+
+ /* tile specific ranges */
+ for_each_tile(tile, xe, id) {
+ err = xe_mmio_tile_vram_size(tile, &vram_size, &tile_size, &tile_offset);
+ if (err)
+ return err;
+
+ tile->mem.vram.actual_physical_size = tile_size;
+ tile->mem.vram.io_start = xe->mem.vram.io_start + tile_offset;
+ tile->mem.vram.io_size = min_t(u64, vram_size, io_size);
+
+ if (!tile->mem.vram.io_size) {
+ drm_err(&xe->drm, "Tile without any CPU visible VRAM. Aborting.\n");
+ return -ENODEV;
+ }
+
+ tile->mem.vram.dpa_base = xe->mem.vram.dpa_base + tile_offset;
+ tile->mem.vram.usable_size = vram_size;
+ tile->mem.vram.mapping = xe->mem.vram.mapping + tile_offset;
+
+ if (tile->mem.vram.io_size < tile->mem.vram.usable_size)
+ drm_info(&xe->drm, "Small BAR device\n");
+ drm_info(&xe->drm, "VRAM[%u, %u]: Actual physical size %pa, usable size exclude stolen %pa, CPU accessible size %pa\n", id,
+ tile->id, &tile->mem.vram.actual_physical_size, &tile->mem.vram.usable_size, &tile->mem.vram.io_size);
+ drm_info(&xe->drm, "VRAM[%u, %u]: DPA range: [%pa-%llx], io range: [%pa-%llx]\n", id, tile->id,
+ &tile->mem.vram.dpa_base, tile->mem.vram.dpa_base + (u64)tile->mem.vram.actual_physical_size,
+ &tile->mem.vram.io_start, tile->mem.vram.io_start + (u64)tile->mem.vram.io_size);
+
+ /* calculate total size using tile size to get the correct HW sizing */
+ total_size += tile_size;
+ available_size += vram_size;
+
+ if (total_size > xe->mem.vram.io_size) {
+ drm_info(&xe->drm, "VRAM: %pa is larger than resource %pa\n",
+ &total_size, &xe->mem.vram.io_size);
+ }
+
+ io_size -= min_t(u64, tile_size, io_size);
+ }
+
+ xe->mem.vram.actual_physical_size = total_size;
+
+ drm_info(&xe->drm, "Total VRAM: %pa, %pa\n", &xe->mem.vram.io_start,
+ &xe->mem.vram.actual_physical_size);
+ drm_info(&xe->drm, "Available VRAM: %pa, %pa\n", &xe->mem.vram.io_start,
+ &available_size);
+
+ return devm_add_action_or_reset(xe->drm.dev, vram_fini, xe);
+}
diff --git a/drivers/gpu/drm/xe/xe_vram.h b/drivers/gpu/drm/xe/xe_vram.h
new file mode 100644
index 000000000000..e31cc04ec0db
--- /dev/null
+++ b/drivers/gpu/drm/xe/xe_vram.h
@@ -0,0 +1,13 @@
+/* SPDX-License-Identifier: MIT */
+/*
+ * Copyright © 2024 Intel Corporation
+ */
+
+#ifndef _XE_VRAM_H_
+#define _XE_VRAM_H_
+
+struct xe_device;
+
+int xe_vram_probe(struct xe_device *xe);
+
+#endif
--
2.43.0
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