1 files changed, 462 insertions, 0 deletions
diff --git a/drivers/gpu/drm/xe/xe_vram.c b/drivers/gpu/drm/xe/xe_vram.c
new file mode 100644
index 000000000000..d50baefcd124
--- /dev/null
+++ b/drivers/gpu/drm/xe/xe_vram.c
@@ -0,0 +1,462 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2021-2024 Intel Corporation
+ */
+
+#include <kunit/visibility.h>
+#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_bo.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_sriov.h"
+#include "xe_tile_sriov_vf.h"
+#include "xe_ttm_vram_mgr.h"
+#include "xe_vram.h"
+#include "xe_vram_types.h"
+
+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;
+
+	ret = pci_resize_resource(pdev, resno, bar_size, 0);
+	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
+ */
+void xe_vram_resize_bar(struct xe_device *xe)
+{
+	int 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;
+	int max_size, i;
+	u32 pci_cmd;
+
+	/* gather some relevant info */
+	current_size = pci_resource_len(pdev, LMEM_BAR);
+
+	if (force_vram_bar_size < 0)
+		return;
+
+	/* set to a specific size? */
+	if (force_vram_bar_size) {
+		rebar_size = pci_rebar_bytes_to_size(force_vram_bar_size *
+						     (resource_size_t)SZ_1M);
+
+		if (!pci_rebar_size_supported(pdev, LMEM_BAR, rebar_size)) {
+			drm_info(&xe->drm,
+				 "Requested size: %lluMiB is not supported by rebar sizes: 0x%llx. Leaving default: %lluMiB\n",
+				 (u64)pci_rebar_size_to_bytes(rebar_size) >> 20,
+				 pci_rebar_get_possible_sizes(pdev, LMEM_BAR),
+				 (u64)current_size >> 20);
+			return;
+		}
+
+		rebar_size = pci_rebar_size_to_bytes(rebar_size);
+		if (rebar_size == current_size)
+			return;
+	} else {
+		max_size = pci_rebar_get_max_size(pdev, LMEM_BAR);
+		if (max_size < 0)
+			return;
+		rebar_size = pci_rebar_size_to_bytes(max_size);
+
+		/* 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 resource_is_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 determine_lmem_bar_size(struct xe_device *xe, struct xe_vram_region *lmem_bar)
+{
+	struct pci_dev *pdev = to_pci_dev(xe->drm.dev);
+
+	if (!resource_is_valid(pdev, LMEM_BAR)) {
+		drm_err(&xe->drm, "pci resource is not valid\n");
+		return -ENXIO;
+	}
+
+	lmem_bar->io_start = pci_resource_start(pdev, LMEM_BAR);
+	lmem_bar->io_size = pci_resource_len(pdev, LMEM_BAR);
+	if (!lmem_bar->io_size)
+		return -EIO;
+
+	/* XXX: Need to change when xe link code is ready */
+	lmem_bar->dpa_base = 0;
+
+	/* set up a map to the total memory area. */
+	lmem_bar->mapping = devm_ioremap_wc(&pdev->dev, lmem_bar->io_start, lmem_bar->io_size);
+
+	return 0;
+}
+
+static int get_flat_ccs_offset(struct xe_gt *gt, u64 tile_size, u64 *poffset)
+{
+	struct xe_device *xe = gt_to_xe(gt);
+	unsigned int fw_ref;
+	u64 offset;
+	u32 reg;
+
+	fw_ref = xe_force_wake_get(gt_to_fw(gt), XE_FW_GT);
+	if (!fw_ref)
+		return -ETIMEDOUT;
+
+	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->mmio, 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 */
+		offset = round_up(offset, SZ_128K); /* SW must round up to nearest 128K */
+
+		/* We don't expect any holes */
+		xe_assert_msg(xe, offset == (xe_mmio_read64_2x32(&gt_to_tile(gt)->mmio, 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;
+	}
+
+	xe_force_wake_put(gt_to_fw(gt), fw_ref);
+	*poffset = offset;
+
+	return 0;
+}
+
+/*
+ * 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 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;
+	u32 reg;
+
+	if (IS_SRIOV_VF(xe)) {
+		struct xe_tile *t;
+		int id;
+
+		offset = 0;
+		for_each_tile(t, xe, id)
+			for_each_if(t->id < tile->id)
+				offset += xe_tile_sriov_vf_lmem(t);
+
+		*tile_size = xe_tile_sriov_vf_lmem(tile);
+		*vram_size = *tile_size;
+		*tile_offset = offset;
+
+		return 0;
+	}
+
+	/* 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_mmio_read32(&tile->mmio, SG_TILE_ADDR_RANGE(tile->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) {
+		int ret = get_flat_ccs_offset(gt, *tile_size, &offset);
+
+		if (ret)
+			return ret;
+	} else {
+		offset = xe_mmio_read64_2x32(&tile->mmio, GSMBASE);
+	}
+
+	/* remove the tile offset so we have just the available size */
+	*vram_size = offset - *tile_offset;
+
+	return 0;
+}
+
+static void vram_fini(void *arg)
+{
+	struct xe_device *xe = arg;
+	struct xe_tile *tile;
+	int id;
+
+	xe->mem.vram->mapping = NULL;
+
+	for_each_tile(tile, xe, id) {
+		tile->mem.vram->mapping = NULL;
+		if (tile->mem.kernel_vram)
+			tile->mem.kernel_vram->mapping = NULL;
+	}
+}
+
+struct xe_vram_region *xe_vram_region_alloc(struct xe_device *xe, u8 id, u32 placement)
+{
+	struct xe_vram_region *vram;
+	struct drm_device *drm = &xe->drm;
+
+	xe_assert(xe, id < xe->info.tile_count);
+
+	vram = drmm_kzalloc(drm, sizeof(*vram), GFP_KERNEL);
+	if (!vram)
+		return NULL;
+
+	vram->xe = xe;
+	vram->id = id;
+	vram->placement = placement;
+#if defined(CONFIG_DRM_XE_PAGEMAP)
+	vram->migrate = xe->tiles[id].migrate;
+#endif
+	return vram;
+}
+
+static void print_vram_region_info(struct xe_device *xe, struct xe_vram_region *vram)
+{
+	struct drm_device *drm = &xe->drm;
+
+	if (vram->io_size < vram->usable_size)
+		drm_info(drm, "Small BAR device\n");
+
+	drm_info(drm,
+		 "VRAM[%u]: Actual physical size %pa, usable size exclude stolen %pa, CPU accessible size %pa\n",
+		 vram->id, &vram->actual_physical_size, &vram->usable_size, &vram->io_size);
+	drm_info(drm, "VRAM[%u]: DPA range: [%pa-%llx], io range: [%pa-%llx]\n",
+		 vram->id, &vram->dpa_base, vram->dpa_base + (u64)vram->actual_physical_size,
+		 &vram->io_start, vram->io_start + (u64)vram->io_size);
+}
+
+static int vram_region_init(struct xe_device *xe, struct xe_vram_region *vram,
+			    struct xe_vram_region *lmem_bar, u64 offset, u64 usable_size,
+			    u64 region_size, resource_size_t remain_io_size)
+{
+	/* Check if VRAM region is already initialized */
+	if (vram->mapping)
+		return 0;
+
+	vram->actual_physical_size = region_size;
+	vram->io_start = lmem_bar->io_start + offset;
+	vram->io_size = min_t(u64, usable_size, remain_io_size);
+
+	if (!vram->io_size) {
+		drm_err(&xe->drm, "Tile without any CPU visible VRAM. Aborting.\n");
+		return -ENODEV;
+	}
+
+	vram->dpa_base = lmem_bar->dpa_base + offset;
+	vram->mapping = lmem_bar->mapping + offset;
+	vram->usable_size = usable_size;
+
+	print_vram_region_info(xe, vram);
+
+	return 0;
+}
+
+/**
+ * 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;
+	struct xe_vram_region lmem_bar;
+	resource_size_t remain_io_size;
+	u64 available_size = 0;
+	u64 total_size = 0;
+	int err;
+	u8 id;
+
+	if (!IS_DGFX(xe))
+		return 0;
+
+	err = determine_lmem_bar_size(xe, &lmem_bar);
+	if (err)
+		return err;
+	drm_info(&xe->drm, "VISIBLE VRAM: %pa, %pa\n", &lmem_bar.io_start, &lmem_bar.io_size);
+
+	remain_io_size = lmem_bar.io_size;
+
+	for_each_tile(tile, xe, id) {
+		u64 region_size;
+		u64 usable_size;
+		u64 tile_offset;
+
+		err = tile_vram_size(tile, &usable_size, &region_size, &tile_offset);
+		if (err)
+			return err;
+
+		total_size += region_size;
+		available_size += usable_size;
+
+		err = vram_region_init(xe, tile->mem.vram, &lmem_bar, tile_offset, usable_size,
+				       region_size, remain_io_size);
+		if (err)
+			return err;
+
+		if (total_size > lmem_bar.io_size) {
+			drm_info(&xe->drm, "VRAM: %pa is larger than resource %pa\n",
+				 &total_size, &lmem_bar.io_size);
+		}
+
+		remain_io_size -= min_t(u64, tile->mem.vram->actual_physical_size, remain_io_size);
+	}
+
+	err = vram_region_init(xe, xe->mem.vram, &lmem_bar, 0, available_size, total_size,
+			       lmem_bar.io_size);
+	if (err)
+		return err;
+
+	return devm_add_action_or_reset(xe->drm.dev, vram_fini, xe);
+}
+
+/**
+ * xe_vram_region_io_start - Get the IO start of a VRAM region
+ * @vram: the VRAM region
+ *
+ * Return: the IO start of the VRAM region, or 0 if not valid
+ */
+resource_size_t xe_vram_region_io_start(const struct xe_vram_region *vram)
+{
+	return vram ? vram->io_start : 0;
+}
+
+/**
+ * xe_vram_region_io_size - Get the IO size of a VRAM region
+ * @vram: the VRAM region
+ *
+ * Return: the IO size of the VRAM region, or 0 if not valid
+ */
+resource_size_t xe_vram_region_io_size(const struct xe_vram_region *vram)
+{
+	return vram ? vram->io_size : 0;
+}
+
+/**
+ * xe_vram_region_dpa_base - Get the DPA base of a VRAM region
+ * @vram: the VRAM region
+ *
+ * Return: the DPA base of the VRAM region, or 0 if not valid
+ */
+resource_size_t xe_vram_region_dpa_base(const struct xe_vram_region *vram)
+{
+	return vram ? vram->dpa_base : 0;
+}
+
+/**
+ * xe_vram_region_usable_size - Get the usable size of a VRAM region
+ * @vram: the VRAM region
+ *
+ * Return: the usable size of the VRAM region, or 0 if not valid
+ */
+resource_size_t xe_vram_region_usable_size(const struct xe_vram_region *vram)
+{
+	return vram ? vram->usable_size : 0;
+}
+
+/**
+ * xe_vram_region_actual_physical_size - Get the actual physical size of a VRAM region
+ * @vram: the VRAM region
+ *
+ * Return: the actual physical size of the VRAM region, or 0 if not valid
+ */
+resource_size_t xe_vram_region_actual_physical_size(const struct xe_vram_region *vram)
+{
+	return vram ? vram->actual_physical_size : 0;
+}
+EXPORT_SYMBOL_IF_KUNIT(xe_vram_region_actual_physical_size);