drivers/gpu/drm/i915/gt/intel_region_lmem.c - linux - Git at Google

 // SPDX-License-Identifier: MIT
 /*
  * Copyright © 2019 Intel Corporation
  */

 #include "i915_drv.h"
 #include "i915_reg.h"
 #include "intel_memory_region.h"
 #include "intel_region_lmem.h"
 #include "intel_region_ttm.h"
 #include "gem/i915_gem_lmem.h"
 #include "gem/i915_gem_region.h"
 #include "gem/i915_gem_ttm.h"
 #include "gt/intel_gt.h"
 #include "gt/intel_gt_mcr.h"
 #include "gt/intel_gt_regs.h"

 static void _release_bars(struct pci_dev *pdev)
 {
 	int resno;

 	for (resno = PCI_STD_RESOURCES; resno < PCI_STD_RESOURCE_END; resno++) {
 		if (pci_resource_len(pdev, resno))
 			pci_release_resource(pdev, resno);
 	}
 }

 static void
 _resize_bar(struct drm_i915_private *i915, int resno, resource_size_t size)
 {
 	struct pci_dev *pdev = to_pci_dev(i915->drm.dev);
 	int bar_size = pci_rebar_bytes_to_size(size);
 	int ret;

 	_release_bars(pdev);

 	ret = pci_resize_resource(pdev, resno, bar_size);
 	if (ret) {
 		drm_info(&i915->drm, "Failed to resize BAR%d to %dM (%pe)\n",
 			 resno, 1 << bar_size, ERR_PTR(ret));
 		return;
 	}

 	drm_info(&i915->drm, "BAR%d resized to %dM\n", resno, 1 << bar_size);
 }

 #define LMEM_BAR_NUM 2
 static void i915_resize_lmem_bar(struct drm_i915_private *i915, resource_size_t lmem_size)
 {
 	struct pci_dev *pdev = to_pci_dev(i915->drm.dev);
 	struct pci_bus *root = pdev->bus;
 	struct resource *root_res;
 	resource_size_t rebar_size;
 	resource_size_t current_size;
 	u32 pci_cmd;
 	int i;

 	current_size = roundup_pow_of_two(pci_resource_len(pdev, LMEM_BAR_NUM));

 	if (i915->params.lmem_bar_size) {
 		u32 bar_sizes;

 		rebar_size = i915->params.lmem_bar_size *
 			(resource_size_t)SZ_1M;
 		bar_sizes = pci_rebar_get_possible_sizes(pdev,
 							 LMEM_BAR_NUM);

 		if (rebar_size == current_size)
 			return;

 		if (!(bar_sizes & BIT(pci_rebar_bytes_to_size(rebar_size))) ||
 		    rebar_size >= roundup_pow_of_two(lmem_size)) {
 			rebar_size = lmem_size;

 			drm_info(&i915->drm,
 				 "Given bar size is not within supported size, setting it to default: %llu\n",
 				 (u64)lmem_size >> 20);
 		}
 	} else {
 		rebar_size = current_size;

 		if (rebar_size != roundup_pow_of_two(lmem_size))
 			rebar_size = lmem_size;
 		else
 			return;
 	}

 	/* Find out if root bus contains 64bit memory addressing */
 	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) &&
 		    root_res->start > 0x100000000ull)
 			break;
 	}

 	/* pci_resize_resource will fail anyways */
 	if (!root_res) {
 		drm_info(&i915->drm, "Can't resize LMEM BAR - platform support is missing\n");
 		return;
 	}

 	/* First disable PCI memory decoding references */
 	pci_read_config_dword(pdev, PCI_COMMAND, &pci_cmd);
 	pci_write_config_dword(pdev, PCI_COMMAND,
 			       pci_cmd & ~PCI_COMMAND_MEMORY);

 	_resize_bar(i915, LMEM_BAR_NUM, rebar_size);

 	pci_assign_unassigned_bus_resources(pdev->bus);
 	pci_write_config_dword(pdev, PCI_COMMAND, pci_cmd);
 }

 static int
 region_lmem_release(struct intel_memory_region *mem)
 {
 	int ret;

 	ret = intel_region_ttm_fini(mem);
 	io_mapping_fini(&mem->iomap);

 	return ret;
 }

 static int
 region_lmem_init(struct intel_memory_region *mem)
 {
 	int ret;

 	if (!io_mapping_init_wc(&mem->iomap,
 				mem->io_start,
 				mem->io_size))
 		return -EIO;

 	ret = intel_region_ttm_init(mem);
 	if (ret)
 		goto out_no_buddy;

 	return 0;

 out_no_buddy:
 	io_mapping_fini(&mem->iomap);

 	return ret;
 }

 static const struct intel_memory_region_ops intel_region_lmem_ops = {
 	.init = region_lmem_init,
 	.release = region_lmem_release,
 	.init_object = __i915_gem_ttm_object_init,
 };

 static bool get_legacy_lowmem_region(struct intel_uncore *uncore,
 				     u64 *start, u32 *size)
 {
 	if (!IS_DG1_GRAPHICS_STEP(uncore->i915, STEP_A0, STEP_C0))
 		return false;

 	*start = 0;
 	*size = SZ_1M;

 	drm_dbg(&uncore->i915->drm, "LMEM: reserved legacy low-memory [0x%llx-0x%llx]\n",
 		*start, *start + *size);

 	return true;
 }

 static int reserve_lowmem_region(struct intel_uncore *uncore,
 				 struct intel_memory_region *mem)
 {
 	u64 reserve_start;
 	u32 reserve_size;
 	int ret;

 	if (!get_legacy_lowmem_region(uncore, &reserve_start, &reserve_size))
 		return 0;

 	ret = intel_memory_region_reserve(mem, reserve_start, reserve_size);
 	if (ret)
 		drm_err(&uncore->i915->drm, "LMEM: reserving low memory region failed\n");

 	return ret;
 }

 static struct intel_memory_region *setup_lmem(struct intel_gt *gt)
 {
 	struct drm_i915_private *i915 = gt->i915;
 	struct intel_uncore *uncore = gt->uncore;
 	struct pci_dev *pdev = to_pci_dev(i915->drm.dev);
 	struct intel_memory_region *mem;
 	resource_size_t min_page_size;
 	resource_size_t io_start;
 	resource_size_t io_size;
 	resource_size_t lmem_size;
 	int err;

 	if (!IS_DGFX(i915))
 		return ERR_PTR(-ENODEV);

 	if (HAS_FLAT_CCS(i915)) {
 		resource_size_t lmem_range;
 		u64 tile_stolen, flat_ccs_base;

 		lmem_range = intel_gt_mcr_read_any(&i915->gt0, XEHP_TILE0_ADDR_RANGE) & 0xFFFF;
 		lmem_size = lmem_range >> XEHP_TILE_LMEM_RANGE_SHIFT;
 		lmem_size *= SZ_1G;

 		flat_ccs_base = intel_gt_mcr_read_any(gt, XEHP_FLAT_CCS_BASE_ADDR);
 		flat_ccs_base = (flat_ccs_base >> XEHP_CCS_BASE_SHIFT) * SZ_64K;

 		if (GEM_WARN_ON(lmem_size < flat_ccs_base))
 			return ERR_PTR(-EIO);

 		tile_stolen = lmem_size - flat_ccs_base;

 		/* If the FLAT_CCS_BASE_ADDR register is not populated, flag an error */
 		if (tile_stolen == lmem_size)
 			drm_err(&i915->drm,
 				"CCS_BASE_ADDR register did not have expected value\n");

 		lmem_size -= tile_stolen;
 	} else {
 		/* Stolen starts from GSMBASE without CCS */
 		lmem_size = intel_uncore_read64(&i915->uncore, GEN12_GSMBASE);
 	}

 	i915_resize_lmem_bar(i915, lmem_size);

 	if (i915->params.lmem_size > 0) {
 		lmem_size = min_t(resource_size_t, lmem_size,
 				  mul_u32_u32(i915->params.lmem_size, SZ_1M));
 	}

 	io_start = pci_resource_start(pdev, 2);
 	io_size = min(pci_resource_len(pdev, 2), lmem_size);
 	if (!io_size)
 		return ERR_PTR(-EIO);

 	min_page_size = HAS_64K_PAGES(i915) ? I915_GTT_PAGE_SIZE_64K :
 						I915_GTT_PAGE_SIZE_4K;
 	mem = intel_memory_region_create(i915,
 					 0,
 					 lmem_size,
 					 min_page_size,
 					 io_start,
 					 io_size,
 					 INTEL_MEMORY_LOCAL,
 					 0,
 					 &intel_region_lmem_ops);
 	if (IS_ERR(mem))
 		return mem;

 	err = reserve_lowmem_region(uncore, mem);
 	if (err)
 		goto err_region_put;

 	drm_dbg(&i915->drm, "Local memory: %pR\n", &mem->region);
 	drm_dbg(&i915->drm, "Local memory IO start: %pa\n",
 		&mem->io_start);
 	drm_info(&i915->drm, "Local memory IO size: %pa\n",
 		 &mem->io_size);
 	drm_info(&i915->drm, "Local memory available: %pa\n",
 		 &lmem_size);

 	if (io_size < lmem_size)
 		drm_info(&i915->drm, "Using a reduced BAR size of %lluMiB. Consider enabling 'Resizable BAR' or similar, if available in the BIOS.\n",
 			 (u64)io_size >> 20);

 	return mem;

 err_region_put:
 	intel_memory_region_destroy(mem);
 	return ERR_PTR(err);
 }

 struct intel_memory_region *intel_gt_setup_lmem(struct intel_gt *gt)
 {
 	return setup_lmem(gt);
 }
	// SPDX-License-Identifier: MIT
	/*
	* Copyright © 2019 Intel Corporation
	*/

	#include "i915_drv.h"
	#include "i915_reg.h"
	#include "intel_memory_region.h"
	#include "intel_region_lmem.h"
	#include "intel_region_ttm.h"
	#include "gem/i915_gem_lmem.h"
	#include "gem/i915_gem_region.h"
	#include "gem/i915_gem_ttm.h"
	#include "gt/intel_gt.h"
	#include "gt/intel_gt_mcr.h"
	#include "gt/intel_gt_regs.h"

	static void _release_bars(struct pci_dev *pdev)
	{
	int resno;

	for (resno = PCI_STD_RESOURCES; resno < PCI_STD_RESOURCE_END; resno++) {
	if (pci_resource_len(pdev, resno))
	pci_release_resource(pdev, resno);
	}
	}

	static void
	_resize_bar(struct drm_i915_private *i915, int resno, resource_size_t size)
	{
	struct pci_dev *pdev = to_pci_dev(i915->drm.dev);
	int bar_size = pci_rebar_bytes_to_size(size);
	int ret;

	_release_bars(pdev);

	ret = pci_resize_resource(pdev, resno, bar_size);
	if (ret) {
	drm_info(&i915->drm, "Failed to resize BAR%d to %dM (%pe)\n",
	resno, 1 << bar_size, ERR_PTR(ret));
	return;
	}

	drm_info(&i915->drm, "BAR%d resized to %dM\n", resno, 1 << bar_size);
	}

	#define LMEM_BAR_NUM 2
	static void i915_resize_lmem_bar(struct drm_i915_private *i915, resource_size_t lmem_size)
	{
	struct pci_dev *pdev = to_pci_dev(i915->drm.dev);
	struct pci_bus *root = pdev->bus;
	struct resource *root_res;
	resource_size_t rebar_size;
	resource_size_t current_size;
	u32 pci_cmd;
	int i;

	current_size = roundup_pow_of_two(pci_resource_len(pdev, LMEM_BAR_NUM));

	if (i915->params.lmem_bar_size) {
	u32 bar_sizes;

	rebar_size = i915->params.lmem_bar_size *
	(resource_size_t)SZ_1M;
	bar_sizes = pci_rebar_get_possible_sizes(pdev,
	LMEM_BAR_NUM);

	if (rebar_size == current_size)
	return;

	if (!(bar_sizes & BIT(pci_rebar_bytes_to_size(rebar_size))) \|\|
	rebar_size >= roundup_pow_of_two(lmem_size)) {
	rebar_size = lmem_size;

	drm_info(&i915->drm,
	"Given bar size is not within supported size, setting it to default: %llu\n",
	(u64)lmem_size >> 20);
	}
	} else {
	rebar_size = current_size;

	if (rebar_size != roundup_pow_of_two(lmem_size))
	rebar_size = lmem_size;
	else
	return;
	}

	/* Find out if root bus contains 64bit memory addressing */
	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) &&
	root_res->start > 0x100000000ull)
	break;
	}

	/* pci_resize_resource will fail anyways */
	if (!root_res) {
	drm_info(&i915->drm, "Can't resize LMEM BAR - platform support is missing\n");
	return;
	}

	/* First disable PCI memory decoding references */
	pci_read_config_dword(pdev, PCI_COMMAND, &pci_cmd);
	pci_write_config_dword(pdev, PCI_COMMAND,
	pci_cmd & ~PCI_COMMAND_MEMORY);

	_resize_bar(i915, LMEM_BAR_NUM, rebar_size);

	pci_assign_unassigned_bus_resources(pdev->bus);
	pci_write_config_dword(pdev, PCI_COMMAND, pci_cmd);
	}

	static int
	region_lmem_release(struct intel_memory_region *mem)
	{
	int ret;

	ret = intel_region_ttm_fini(mem);
	io_mapping_fini(&mem->iomap);

	return ret;
	}

	static int
	region_lmem_init(struct intel_memory_region *mem)
	{
	int ret;

	if (!io_mapping_init_wc(&mem->iomap,
	mem->io_start,
	mem->io_size))
	return -EIO;

	ret = intel_region_ttm_init(mem);
	if (ret)
	goto out_no_buddy;

	return 0;

	out_no_buddy:
	io_mapping_fini(&mem->iomap);

	return ret;
	}

	static const struct intel_memory_region_ops intel_region_lmem_ops = {
	.init = region_lmem_init,
	.release = region_lmem_release,
	.init_object = __i915_gem_ttm_object_init,
	};

	static bool get_legacy_lowmem_region(struct intel_uncore *uncore,
	u64 start, u32 size)
	{
	if (!IS_DG1_GRAPHICS_STEP(uncore->i915, STEP_A0, STEP_C0))
	return false;

	*start = 0;
	*size = SZ_1M;

	drm_dbg(&uncore->i915->drm, "LMEM: reserved legacy low-memory [0x%llx-0x%llx]\n",
	start, start + *size);

	return true;
	}

	static int reserve_lowmem_region(struct intel_uncore *uncore,
	struct intel_memory_region *mem)
	{
	u64 reserve_start;
	u32 reserve_size;
	int ret;

	if (!get_legacy_lowmem_region(uncore, &reserve_start, &reserve_size))
	return 0;

	ret = intel_memory_region_reserve(mem, reserve_start, reserve_size);
	if (ret)
	drm_err(&uncore->i915->drm, "LMEM: reserving low memory region failed\n");

	return ret;
	}

	static struct intel_memory_region setup_lmem(struct intel_gt gt)
	{
	struct drm_i915_private *i915 = gt->i915;
	struct intel_uncore *uncore = gt->uncore;
	struct pci_dev *pdev = to_pci_dev(i915->drm.dev);
	struct intel_memory_region *mem;
	resource_size_t min_page_size;
	resource_size_t io_start;
	resource_size_t io_size;
	resource_size_t lmem_size;
	int err;

	if (!IS_DGFX(i915))
	return ERR_PTR(-ENODEV);

	if (HAS_FLAT_CCS(i915)) {
	resource_size_t lmem_range;
	u64 tile_stolen, flat_ccs_base;

	lmem_range = intel_gt_mcr_read_any(&i915->gt0, XEHP_TILE0_ADDR_RANGE) & 0xFFFF;
	lmem_size = lmem_range >> XEHP_TILE_LMEM_RANGE_SHIFT;
	lmem_size *= SZ_1G;

	flat_ccs_base = intel_gt_mcr_read_any(gt, XEHP_FLAT_CCS_BASE_ADDR);
	flat_ccs_base = (flat_ccs_base >> XEHP_CCS_BASE_SHIFT) * SZ_64K;

	if (GEM_WARN_ON(lmem_size < flat_ccs_base))
	return ERR_PTR(-EIO);

	tile_stolen = lmem_size - flat_ccs_base;

	/* If the FLAT_CCS_BASE_ADDR register is not populated, flag an error */
	if (tile_stolen == lmem_size)
	drm_err(&i915->drm,
	"CCS_BASE_ADDR register did not have expected value\n");

	lmem_size -= tile_stolen;
	} else {
	/* Stolen starts from GSMBASE without CCS */
	lmem_size = intel_uncore_read64(&i915->uncore, GEN12_GSMBASE);
	}

	i915_resize_lmem_bar(i915, lmem_size);

	if (i915->params.lmem_size > 0) {
	lmem_size = min_t(resource_size_t, lmem_size,
	mul_u32_u32(i915->params.lmem_size, SZ_1M));
	}

	io_start = pci_resource_start(pdev, 2);
	io_size = min(pci_resource_len(pdev, 2), lmem_size);
	if (!io_size)
	return ERR_PTR(-EIO);

	min_page_size = HAS_64K_PAGES(i915) ? I915_GTT_PAGE_SIZE_64K :
	I915_GTT_PAGE_SIZE_4K;
	mem = intel_memory_region_create(i915,
	0,
	lmem_size,
	min_page_size,
	io_start,
	io_size,
	INTEL_MEMORY_LOCAL,
	0,
	&intel_region_lmem_ops);
	if (IS_ERR(mem))
	return mem;

	err = reserve_lowmem_region(uncore, mem);
	if (err)
	goto err_region_put;

	drm_dbg(&i915->drm, "Local memory: %pR\n", &mem->region);
	drm_dbg(&i915->drm, "Local memory IO start: %pa\n",
	&mem->io_start);
	drm_info(&i915->drm, "Local memory IO size: %pa\n",
	&mem->io_size);
	drm_info(&i915->drm, "Local memory available: %pa\n",
	&lmem_size);

	if (io_size < lmem_size)
	drm_info(&i915->drm, "Using a reduced BAR size of %lluMiB. Consider enabling 'Resizable BAR' or similar, if available in the BIOS.\n",
	(u64)io_size >> 20);

	return mem;

	err_region_put:
	intel_memory_region_destroy(mem);
	return ERR_PTR(err);
	}

	struct intel_memory_region intel_gt_setup_lmem(struct intel_gt gt)
	{
	return setup_lmem(gt);
	}