drm/i915/gt: Re-do the intel-gtt split

Re-do what was attempted in commit 7a5c9223 ("drm/i915/gt: Split
intel-gtt functions by arch"). The goal of that commit was to split the
handlers for older hardware that depend on intel-gtt.ko so i915 can
be built for non-x86 archs, after some more patches. Other archs do not
need intel-gtt.ko.

Main issue with the previous approach: it moved all the hooks, including
the gen8, which is used by all platforms gen8 and newer.  Re-do the
split moving only the handlers for gen < 6, which are the only ones
calling out to the separate module.

While at it do some minor cleanups:
  - Rename the prefix s/gen5_/gmch_/ to be more accurate what platforms
    are covered by intel_ggtt_gmch.c
  - Remove dead code for gen12 out of needs_idle_maps()
  - Remove TODO comment leftover
  - Re-order if/else ladder in ggtt_probe_hw() to keep newest platforms
    first

v2: Add minor cleanups (Matt Roper)
Signed-off-by: Lucas De Marchi <lucas.demarchi@intel.com>
Acked-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220617230559.2109427-2-lucas.demarchi@intel.com

drivers/gpu/drm/i915/Makefile

@@ -130,7 +130,7 @@ gt-y += \
 	gt/shmem_utils.o \
 	gt/sysfs_engines.o
 # x86 intel-gtt module support
-gt-$(CONFIG_X86) += gt/intel_gt_gmch.o
+gt-$(CONFIG_X86) += gt/intel_ggtt_gmch.o
 # autogenerated null render state
 gt-y += \
 	gt/gen6_renderstate.o \

drivers/gpu/drm/i915/gt/intel_ggtt.c

@@ -3,16 +3,18 @@
  * Copyright © 2020 Intel Corporation
  */
 
-#include <linux/types.h>
 #include <asm/set_memory.h>
 #include <asm/smp.h>
+#include <linux/types.h>
+#include <linux/stop_machine.h>
 
 #include <drm/i915_drm.h>
+#include <drm/intel-gtt.h>
 
 #include "gem/i915_gem_lmem.h"
 
+#include "intel_ggtt_gmch.h"
 #include "intel_gt.h"
-#include "intel_gt_gmch.h"
 #include "intel_gt_regs.h"
 #include "i915_drv.h"
 #include "i915_scatterlist.h"
@@ -208,7 +210,7 @@ void gen6_ggtt_invalidate(struct i915_ggtt *ggtt)
 	spin_unlock_irq(&uncore->lock);
 }
 
-void gen8_ggtt_invalidate(struct i915_ggtt *ggtt)
+static void gen8_ggtt_invalidate(struct i915_ggtt *ggtt)
 {
 	struct intel_uncore *uncore = ggtt->vm.gt->uncore;
 
@@ -245,6 +247,227 @@ u64 gen8_ggtt_pte_encode(dma_addr_t addr,
 	return pte;
 }
 
+static void gen8_set_pte(void __iomem *addr, gen8_pte_t pte)
+{
+	writeq(pte, addr);
+}
+
+static void gen8_ggtt_insert_page(struct i915_address_space *vm,
+				  dma_addr_t addr,
+				  u64 offset,
+				  enum i915_cache_level level,
+				  u32 flags)
+{
+	struct i915_ggtt *ggtt = i915_vm_to_ggtt(vm);
+	gen8_pte_t __iomem *pte =
+		(gen8_pte_t __iomem *)ggtt->gsm + offset / I915_GTT_PAGE_SIZE;
+
+	gen8_set_pte(pte, gen8_ggtt_pte_encode(addr, level, flags));
+
+	ggtt->invalidate(ggtt);
+}
+
+static void gen8_ggtt_insert_entries(struct i915_address_space *vm,
+				     struct i915_vma_resource *vma_res,
+				     enum i915_cache_level level,
+				     u32 flags)
+{
+	const gen8_pte_t pte_encode = gen8_ggtt_pte_encode(0, level, flags);
+	struct i915_ggtt *ggtt = i915_vm_to_ggtt(vm);
+	gen8_pte_t __iomem *gte;
+	gen8_pte_t __iomem *end;
+	struct sgt_iter iter;
+	dma_addr_t addr;
+
+	/*
+	 * Note that we ignore PTE_READ_ONLY here. The caller must be careful
+	 * not to allow the user to override access to a read only page.
+	 */
+
+	gte = (gen8_pte_t __iomem *)ggtt->gsm;
+	gte += vma_res->start / I915_GTT_PAGE_SIZE;
+	end = gte + vma_res->node_size / I915_GTT_PAGE_SIZE;
+
+	for_each_sgt_daddr(addr, iter, vma_res->bi.pages)
+		gen8_set_pte(gte++, pte_encode | addr);
+	GEM_BUG_ON(gte > end);
+
+	/* Fill the allocated but "unused" space beyond the end of the buffer */
+	while (gte < end)
+		gen8_set_pte(gte++, vm->scratch[0]->encode);
+
+	/*
+	 * We want to flush the TLBs only after we're certain all the PTE
+	 * updates have finished.
+	 */
+	ggtt->invalidate(ggtt);
+}
+
+static void gen6_ggtt_insert_page(struct i915_address_space *vm,
+				  dma_addr_t addr,
+				  u64 offset,
+				  enum i915_cache_level level,
+				  u32 flags)
+{
+	struct i915_ggtt *ggtt = i915_vm_to_ggtt(vm);
+	gen6_pte_t __iomem *pte =
+		(gen6_pte_t __iomem *)ggtt->gsm + offset / I915_GTT_PAGE_SIZE;
+
+	iowrite32(vm->pte_encode(addr, level, flags), pte);
+
+	ggtt->invalidate(ggtt);
+}
+
+/*
+ * Binds an object into the global gtt with the specified cache level.
+ * The object will be accessible to the GPU via commands whose operands
+ * reference offsets within the global GTT as well as accessible by the GPU
+ * through the GMADR mapped BAR (i915->mm.gtt->gtt).
+ */
+static void gen6_ggtt_insert_entries(struct i915_address_space *vm,
+				     struct i915_vma_resource *vma_res,
+				     enum i915_cache_level level,
+				     u32 flags)
+{
+	struct i915_ggtt *ggtt = i915_vm_to_ggtt(vm);
+	gen6_pte_t __iomem *gte;
+	gen6_pte_t __iomem *end;
+	struct sgt_iter iter;
+	dma_addr_t addr;
+
+	gte = (gen6_pte_t __iomem *)ggtt->gsm;
+	gte += vma_res->start / I915_GTT_PAGE_SIZE;
+	end = gte + vma_res->node_size / I915_GTT_PAGE_SIZE;
+
+	for_each_sgt_daddr(addr, iter, vma_res->bi.pages)
+		iowrite32(vm->pte_encode(addr, level, flags), gte++);
+	GEM_BUG_ON(gte > end);
+
+	/* Fill the allocated but "unused" space beyond the end of the buffer */
+	while (gte < end)
+		iowrite32(vm->scratch[0]->encode, gte++);
+
+	/*
+	 * We want to flush the TLBs only after we're certain all the PTE
+	 * updates have finished.
+	 */
+	ggtt->invalidate(ggtt);
+}
+
+static void nop_clear_range(struct i915_address_space *vm,
+			    u64 start, u64 length)
+{
+}
+
+static void gen8_ggtt_clear_range(struct i915_address_space *vm,
+				  u64 start, u64 length)
+{
+	struct i915_ggtt *ggtt = i915_vm_to_ggtt(vm);
+	unsigned int first_entry = start / I915_GTT_PAGE_SIZE;
+	unsigned int num_entries = length / I915_GTT_PAGE_SIZE;
+	const gen8_pte_t scratch_pte = vm->scratch[0]->encode;
+	gen8_pte_t __iomem *gtt_base =
+		(gen8_pte_t __iomem *)ggtt->gsm + first_entry;
+	const int max_entries = ggtt_total_entries(ggtt) - first_entry;
+	int i;
+
+	if (WARN(num_entries > max_entries,
+		 "First entry = %d; Num entries = %d (max=%d)\n",
+		 first_entry, num_entries, max_entries))
+		num_entries = max_entries;
+
+	for (i = 0; i < num_entries; i++)
+		gen8_set_pte(&gtt_base[i], scratch_pte);
+}
+
+static void bxt_vtd_ggtt_wa(struct i915_address_space *vm)
+{
+	/*
+	 * Make sure the internal GAM fifo has been cleared of all GTT
+	 * writes before exiting stop_machine(). This guarantees that
+	 * any aperture accesses waiting to start in another process
+	 * cannot back up behind the GTT writes causing a hang.
+	 * The register can be any arbitrary GAM register.
+	 */
+	intel_uncore_posting_read_fw(vm->gt->uncore, GFX_FLSH_CNTL_GEN6);
+}
+
+struct insert_page {
+	struct i915_address_space *vm;
+	dma_addr_t addr;
+	u64 offset;
+	enum i915_cache_level level;
+};
+
+static int bxt_vtd_ggtt_insert_page__cb(void *_arg)
+{
+	struct insert_page *arg = _arg;
+
+	gen8_ggtt_insert_page(arg->vm, arg->addr, arg->offset, arg->level, 0);
+	bxt_vtd_ggtt_wa(arg->vm);
+
+	return 0;
+}
+
+static void bxt_vtd_ggtt_insert_page__BKL(struct i915_address_space *vm,
+					  dma_addr_t addr,
+					  u64 offset,
+					  enum i915_cache_level level,
+					  u32 unused)
+{
+	struct insert_page arg = { vm, addr, offset, level };
+
+	stop_machine(bxt_vtd_ggtt_insert_page__cb, &arg, NULL);
+}
+
+struct insert_entries {
+	struct i915_address_space *vm;
+	struct i915_vma_resource *vma_res;
+	enum i915_cache_level level;
+	u32 flags;
+};
+
+static int bxt_vtd_ggtt_insert_entries__cb(void *_arg)
+{
+	struct insert_entries *arg = _arg;
+
+	gen8_ggtt_insert_entries(arg->vm, arg->vma_res, arg->level, arg->flags);
+	bxt_vtd_ggtt_wa(arg->vm);
+
+	return 0;
+}
+
+static void bxt_vtd_ggtt_insert_entries__BKL(struct i915_address_space *vm,
+					     struct i915_vma_resource *vma_res,
+					     enum i915_cache_level level,
+					     u32 flags)
+{
+	struct insert_entries arg = { vm, vma_res, level, flags };
+
+	stop_machine(bxt_vtd_ggtt_insert_entries__cb, &arg, NULL);
+}
+
+static void gen6_ggtt_clear_range(struct i915_address_space *vm,
+				  u64 start, u64 length)
+{
+	struct i915_ggtt *ggtt = i915_vm_to_ggtt(vm);
+	unsigned int first_entry = start / I915_GTT_PAGE_SIZE;
+	unsigned int num_entries = length / I915_GTT_PAGE_SIZE;
+	gen6_pte_t scratch_pte, __iomem *gtt_base =
+		(gen6_pte_t __iomem *)ggtt->gsm + first_entry;
+	const int max_entries = ggtt_total_entries(ggtt) - first_entry;
+	int i;
+
+	if (WARN(num_entries > max_entries,
+		 "First entry = %d; Num entries = %d (max=%d)\n",
+		 first_entry, num_entries, max_entries))
+		num_entries = max_entries;
+
+	scratch_pte = vm->scratch[0]->encode;
+	for (i = 0; i < num_entries; i++)
+		iowrite32(scratch_pte, &gtt_base[i]);
+}
+
 void intel_ggtt_bind_vma(struct i915_address_space *vm,
 			 struct i915_vm_pt_stash *stash,
 			 struct i915_vma_resource *vma_res,
@@ -589,12 +812,316 @@ void i915_ggtt_driver_late_release(struct drm_i915_private *i915)
 	dma_resv_fini(&ggtt->vm._resv);
 }
 
-struct resource intel_pci_resource(struct pci_dev *pdev, int bar)
+static unsigned int gen6_get_total_gtt_size(u16 snb_gmch_ctl)
+{
+	snb_gmch_ctl >>= SNB_GMCH_GGMS_SHIFT;
+	snb_gmch_ctl &= SNB_GMCH_GGMS_MASK;
+	return snb_gmch_ctl << 20;
+}
+
+static unsigned int gen8_get_total_gtt_size(u16 bdw_gmch_ctl)
+{
+	bdw_gmch_ctl >>= BDW_GMCH_GGMS_SHIFT;
+	bdw_gmch_ctl &= BDW_GMCH_GGMS_MASK;
+	if (bdw_gmch_ctl)
+		bdw_gmch_ctl = 1 << bdw_gmch_ctl;
+
+#ifdef CONFIG_X86_32
+	/* Limit 32b platforms to a 2GB GGTT: 4 << 20 / pte size * I915_GTT_PAGE_SIZE */
+	if (bdw_gmch_ctl > 4)
+		bdw_gmch_ctl = 4;
+#endif
+
+	return bdw_gmch_ctl << 20;
+}
+
+static unsigned int chv_get_total_gtt_size(u16 gmch_ctrl)
+{
+	gmch_ctrl >>= SNB_GMCH_GGMS_SHIFT;
+	gmch_ctrl &= SNB_GMCH_GGMS_MASK;
+
+	if (gmch_ctrl)
+		return 1 << (20 + gmch_ctrl);
+
+	return 0;
+}
+
+static unsigned int gen6_gttmmadr_size(struct drm_i915_private *i915)
+{
+	/*
+	 * GEN6: GTTMMADR size is 4MB and GTTADR starts at 2MB offset
+	 * GEN8: GTTMMADR size is 16MB and GTTADR starts at 8MB offset
+	 */
+	GEM_BUG_ON(GRAPHICS_VER(i915) < 6);
+	return (GRAPHICS_VER(i915) < 8) ? SZ_4M : SZ_16M;
+}
+
+static unsigned int gen6_gttadr_offset(struct drm_i915_private *i915)
+{
+	return gen6_gttmmadr_size(i915) / 2;
+}
+
+static int ggtt_probe_common(struct i915_ggtt *ggtt, u64 size)
+{
+	struct drm_i915_private *i915 = ggtt->vm.i915;
+	struct pci_dev *pdev = to_pci_dev(i915->drm.dev);
+	phys_addr_t phys_addr;
+	u32 pte_flags;
+	int ret;
+
+	GEM_WARN_ON(pci_resource_len(pdev, 0) != gen6_gttmmadr_size(i915));
+	phys_addr = pci_resource_start(pdev, 0) + gen6_gttadr_offset(i915);
+
+	/*
+	 * On BXT+/ICL+ writes larger than 64 bit to the GTT pagetable range
+	 * will be dropped. For WC mappings in general we have 64 byte burst
+	 * writes when the WC buffer is flushed, so we can't use it, but have to
+	 * resort to an uncached mapping. The WC issue is easily caught by the
+	 * readback check when writing GTT PTE entries.
+	 */
+	if (IS_GEN9_LP(i915) || GRAPHICS_VER(i915) >= 11)
+		ggtt->gsm = ioremap(phys_addr, size);
+	else
+		ggtt->gsm = ioremap_wc(phys_addr, size);
+	if (!ggtt->gsm) {
+		drm_err(&i915->drm, "Failed to map the ggtt page table\n");
+		return -ENOMEM;
+	}
+
+	kref_init(&ggtt->vm.resv_ref);
+	ret = setup_scratch_page(&ggtt->vm);
+	if (ret) {
+		drm_err(&i915->drm, "Scratch setup failed\n");
+		/* iounmap will also get called at remove, but meh */
+		iounmap(ggtt->gsm);
+		return ret;
+	}
+
+	pte_flags = 0;
+	if (i915_gem_object_is_lmem(ggtt->vm.scratch[0]))
+		pte_flags |= PTE_LM;
+
+	ggtt->vm.scratch[0]->encode =
+		ggtt->vm.pte_encode(px_dma(ggtt->vm.scratch[0]),
+				    I915_CACHE_NONE, pte_flags);
+
+	return 0;
+}
+
+static void gen6_gmch_remove(struct i915_address_space *vm)
+{
+	struct i915_ggtt *ggtt = i915_vm_to_ggtt(vm);
+
+	iounmap(ggtt->gsm);
+	free_scratch(vm);
+}
+
+static struct resource pci_resource(struct pci_dev *pdev, int bar)
 {
 	return (struct resource)DEFINE_RES_MEM(pci_resource_start(pdev, bar),
 					       pci_resource_len(pdev, bar));
 }
 
+static int gen8_gmch_probe(struct i915_ggtt *ggtt)
+{
+	struct drm_i915_private *i915 = ggtt->vm.i915;
+	struct pci_dev *pdev = to_pci_dev(i915->drm.dev);
+	unsigned int size;
+	u16 snb_gmch_ctl;
+
+	if (!HAS_LMEM(i915)) {
+		ggtt->gmadr = pci_resource(pdev, 2);
+		ggtt->mappable_end = resource_size(&ggtt->gmadr);
+	}
+
+	pci_read_config_word(pdev, SNB_GMCH_CTRL, &snb_gmch_ctl);
+	if (IS_CHERRYVIEW(i915))
+		size = chv_get_total_gtt_size(snb_gmch_ctl);
+	else
+		size = gen8_get_total_gtt_size(snb_gmch_ctl);
+
+	ggtt->vm.alloc_pt_dma = alloc_pt_dma;
+	ggtt->vm.alloc_scratch_dma = alloc_pt_dma;
+	ggtt->vm.lmem_pt_obj_flags = I915_BO_ALLOC_PM_EARLY;
+
+	ggtt->vm.total = (size / sizeof(gen8_pte_t)) * I915_GTT_PAGE_SIZE;
+	ggtt->vm.cleanup = gen6_gmch_remove;
+	ggtt->vm.insert_page = gen8_ggtt_insert_page;
+	ggtt->vm.clear_range = nop_clear_range;
+	if (intel_scanout_needs_vtd_wa(i915))
+		ggtt->vm.clear_range = gen8_ggtt_clear_range;
+
+	ggtt->vm.insert_entries = gen8_ggtt_insert_entries;
+
+	/*
+	 * Serialize GTT updates with aperture access on BXT if VT-d is on,
+	 * and always on CHV.
+	 */
+	if (intel_vm_no_concurrent_access_wa(i915)) {
+		ggtt->vm.insert_entries = bxt_vtd_ggtt_insert_entries__BKL;
+		ggtt->vm.insert_page    = bxt_vtd_ggtt_insert_page__BKL;
+		ggtt->vm.bind_async_flags =
+			I915_VMA_GLOBAL_BIND | I915_VMA_LOCAL_BIND;
+	}
+
+	ggtt->invalidate = gen8_ggtt_invalidate;
+
+	ggtt->vm.vma_ops.bind_vma    = intel_ggtt_bind_vma;
+	ggtt->vm.vma_ops.unbind_vma  = intel_ggtt_unbind_vma;
+
+	ggtt->vm.pte_encode = gen8_ggtt_pte_encode;
+
+	setup_private_pat(ggtt->vm.gt->uncore);
+
+	return ggtt_probe_common(ggtt, size);
+}
+
+static u64 snb_pte_encode(dma_addr_t addr,
+			  enum i915_cache_level level,
+			  u32 flags)
+{
+	gen6_pte_t pte = GEN6_PTE_ADDR_ENCODE(addr) | GEN6_PTE_VALID;
+
+	switch (level) {
+	case I915_CACHE_L3_LLC:
+	case I915_CACHE_LLC:
+		pte |= GEN6_PTE_CACHE_LLC;
+		break;
+	case I915_CACHE_NONE:
+		pte |= GEN6_PTE_UNCACHED;
+		break;
+	default:
+		MISSING_CASE(level);
+	}
+
+	return pte;
+}
+
+static u64 ivb_pte_encode(dma_addr_t addr,
+			  enum i915_cache_level level,
+			  u32 flags)
+{
+	gen6_pte_t pte = GEN6_PTE_ADDR_ENCODE(addr) | GEN6_PTE_VALID;
+
+	switch (level) {
+	case I915_CACHE_L3_LLC:
+		pte |= GEN7_PTE_CACHE_L3_LLC;
+		break;
+	case I915_CACHE_LLC:
+		pte |= GEN6_PTE_CACHE_LLC;
+		break;
+	case I915_CACHE_NONE:
+		pte |= GEN6_PTE_UNCACHED;
+		break;
+	default:
+		MISSING_CASE(level);
+	}
+
+	return pte;
+}
+
+static u64 byt_pte_encode(dma_addr_t addr,
+			  enum i915_cache_level level,
+			  u32 flags)
+{
+	gen6_pte_t pte = GEN6_PTE_ADDR_ENCODE(addr) | GEN6_PTE_VALID;
+
+	if (!(flags & PTE_READ_ONLY))
+		pte |= BYT_PTE_WRITEABLE;
+
+	if (level != I915_CACHE_NONE)
+		pte |= BYT_PTE_SNOOPED_BY_CPU_CACHES;
+
+	return pte;
+}
+
+static u64 hsw_pte_encode(dma_addr_t addr,
+			  enum i915_cache_level level,
+			  u32 flags)
+{
+	gen6_pte_t pte = HSW_PTE_ADDR_ENCODE(addr) | GEN6_PTE_VALID;
+
+	if (level != I915_CACHE_NONE)
+		pte |= HSW_WB_LLC_AGE3;
+
+	return pte;
+}
+
+static u64 iris_pte_encode(dma_addr_t addr,
+			   enum i915_cache_level level,
+			   u32 flags)
+{
+	gen6_pte_t pte = HSW_PTE_ADDR_ENCODE(addr) | GEN6_PTE_VALID;
+
+	switch (level) {
+	case I915_CACHE_NONE:
+		break;
+	case I915_CACHE_WT:
+		pte |= HSW_WT_ELLC_LLC_AGE3;
+		break;
+	default:
+		pte |= HSW_WB_ELLC_LLC_AGE3;
+		break;
+	}
+
+	return pte;
+}
+
+static int gen6_gmch_probe(struct i915_ggtt *ggtt)
+{
+	struct drm_i915_private *i915 = ggtt->vm.i915;
+	struct pci_dev *pdev = to_pci_dev(i915->drm.dev);
+	unsigned int size;
+	u16 snb_gmch_ctl;
+
+	ggtt->gmadr = pci_resource(pdev, 2);
+	ggtt->mappable_end = resource_size(&ggtt->gmadr);
+
+	/*
+	 * 64/512MB is the current min/max we actually know of, but this is
+	 * just a coarse sanity check.
+	 */
+	if (ggtt->mappable_end < (64 << 20) ||
+	    ggtt->mappable_end > (512 << 20)) {
+		drm_err(&i915->drm, "Unknown GMADR size (%pa)\n",
+			&ggtt->mappable_end);
+		return -ENXIO;
+	}
+
+	pci_read_config_word(pdev, SNB_GMCH_CTRL, &snb_gmch_ctl);
+
+	size = gen6_get_total_gtt_size(snb_gmch_ctl);
+	ggtt->vm.total = (size / sizeof(gen6_pte_t)) * I915_GTT_PAGE_SIZE;
+
+	ggtt->vm.alloc_pt_dma = alloc_pt_dma;
+	ggtt->vm.alloc_scratch_dma = alloc_pt_dma;
+
+	ggtt->vm.clear_range = nop_clear_range;
+	if (!HAS_FULL_PPGTT(i915) || intel_scanout_needs_vtd_wa(i915))
+		ggtt->vm.clear_range = gen6_ggtt_clear_range;
+	ggtt->vm.insert_page = gen6_ggtt_insert_page;
+	ggtt->vm.insert_entries = gen6_ggtt_insert_entries;
+	ggtt->vm.cleanup = gen6_gmch_remove;
+
+	ggtt->invalidate = gen6_ggtt_invalidate;
+
+	if (HAS_EDRAM(i915))
+		ggtt->vm.pte_encode = iris_pte_encode;
+	else if (IS_HASWELL(i915))
+		ggtt->vm.pte_encode = hsw_pte_encode;
+	else if (IS_VALLEYVIEW(i915))
+		ggtt->vm.pte_encode = byt_pte_encode;
+	else if (GRAPHICS_VER(i915) >= 7)
+		ggtt->vm.pte_encode = ivb_pte_encode;
+	else
+		ggtt->vm.pte_encode = snb_pte_encode;
+
+	ggtt->vm.vma_ops.bind_vma    = intel_ggtt_bind_vma;
+	ggtt->vm.vma_ops.unbind_vma  = intel_ggtt_unbind_vma;
+
+	return ggtt_probe_common(ggtt, size);
+}
+
 static int ggtt_probe_hw(struct i915_ggtt *ggtt, struct intel_gt *gt)
 {
 	struct drm_i915_private *i915 = gt->i915;
@@ -605,12 +1132,13 @@ static int ggtt_probe_hw(struct i915_ggtt *ggtt, struct intel_gt *gt)
 	ggtt->vm.dma = i915->drm.dev;
 	dma_resv_init(&ggtt->vm._resv);
 
-	if (GRAPHICS_VER(i915) <= 5)
-		ret = intel_gt_gmch_gen5_probe(ggtt);
-	else if (GRAPHICS_VER(i915) < 8)
-		ret = intel_gt_gmch_gen6_probe(ggtt);
+	if (GRAPHICS_VER(i915) >= 8)
+		ret = gen8_gmch_probe(ggtt);
+	else if (GRAPHICS_VER(i915) >= 6)
+		ret = gen6_gmch_probe(ggtt);
 	else
-		ret = intel_gt_gmch_gen8_probe(ggtt);
+		ret = intel_ggtt_gmch_probe(ggtt);
+
 	if (ret) {
 		dma_resv_fini(&ggtt->vm._resv);
 		return ret;
@@ -664,7 +1192,10 @@ int i915_ggtt_probe_hw(struct drm_i915_private *i915)
 
 int i915_ggtt_enable_hw(struct drm_i915_private *i915)
 {
-	return intel_gt_gmch_gen5_enable_hw(i915);
+	if (GRAPHICS_VER(i915) < 6)
+		return intel_ggtt_gmch_enable_hw(i915);
+
+	return 0;
 }
 
 void i915_ggtt_enable_guc(struct i915_ggtt *ggtt)

drivers/gpu/drm/i915/gt/intel_ggtt_gmch.c

+// SPDX-License-Identifier: MIT
+/*
+ * Copyright © 2022 Intel Corporation
+ */
+
+#include "intel_ggtt_gmch.h"
+
+#include <drm/intel-gtt.h>
+#include <drm/i915_drm.h>
+
+#include <linux/agp_backend.h>
+
+#include "i915_drv.h"
+#include "i915_utils.h"
+#include "intel_gtt.h"
+#include "intel_gt_regs.h"
+#include "intel_gt.h"
+
+static void gmch_ggtt_insert_page(struct i915_address_space *vm,
+				  dma_addr_t addr,
+				  u64 offset,
+				  enum i915_cache_level cache_level,
+				  u32 unused)
+{
+	unsigned int flags = (cache_level == I915_CACHE_NONE) ?
+		AGP_USER_MEMORY : AGP_USER_CACHED_MEMORY;
+
+	intel_gmch_gtt_insert_page(addr, offset >> PAGE_SHIFT, flags);
+}
+
+static void gmch_ggtt_insert_entries(struct i915_address_space *vm,
+				     struct i915_vma_resource *vma_res,
+				     enum i915_cache_level cache_level,
+				     u32 unused)
+{
+	unsigned int flags = (cache_level == I915_CACHE_NONE) ?
+		AGP_USER_MEMORY : AGP_USER_CACHED_MEMORY;
+
+	intel_gmch_gtt_insert_sg_entries(vma_res->bi.pages, vma_res->start >> PAGE_SHIFT,
+					 flags);
+}
+
+static void gmch_ggtt_invalidate(struct i915_ggtt *ggtt)
+{
+	intel_gmch_gtt_flush();
+}
+
+static void gmch_ggtt_clear_range(struct i915_address_space *vm,
+				  u64 start, u64 length)
+{
+	intel_gmch_gtt_clear_range(start >> PAGE_SHIFT, length >> PAGE_SHIFT);
+}
+
+static void gmch_ggtt_remove(struct i915_address_space *vm)
+{
+	intel_gmch_remove();
+}
+
+/*
+ * Certain Gen5 chipsets require idling the GPU before unmapping anything from
+ * the GTT when VT-d is enabled.
+ */
+static bool needs_idle_maps(struct drm_i915_private *i915)
+{
+	/*
+	 * Query intel_iommu to see if we need the workaround. Presumably that
+	 * was loaded first.
+	 */
+	if (!i915_vtd_active(i915))
+		return false;
+
+	if (GRAPHICS_VER(i915) == 5 && IS_MOBILE(i915))
+		return true;
+
+	return false;
+}
+
+int intel_ggtt_gmch_probe(struct i915_ggtt *ggtt)
+{
+	struct drm_i915_private *i915 = ggtt->vm.i915;
+	phys_addr_t gmadr_base;
+	int ret;
+
+	ret = intel_gmch_probe(i915->bridge_dev, to_pci_dev(i915->drm.dev), NULL);
+	if (!ret) {
+		drm_err(&i915->drm, "failed to set up gmch\n");
+		return -EIO;
+	}
+
+	intel_gmch_gtt_get(&ggtt->vm.total, &gmadr_base, &ggtt->mappable_end);
+
+	ggtt->gmadr =
+		(struct resource)DEFINE_RES_MEM(gmadr_base, ggtt->mappable_end);
+
+	ggtt->vm.alloc_pt_dma = alloc_pt_dma;
+	ggtt->vm.alloc_scratch_dma = alloc_pt_dma;
+
+	if (needs_idle_maps(i915)) {
+		drm_notice(&i915->drm,
+			   "Flushing DMA requests before IOMMU unmaps; performance may be degraded\n");
+		ggtt->do_idle_maps = true;
+	}
+
+	ggtt->vm.insert_page = gmch_ggtt_insert_page;
+	ggtt->vm.insert_entries = gmch_ggtt_insert_entries;
+	ggtt->vm.clear_range = gmch_ggtt_clear_range;
+	ggtt->vm.cleanup = gmch_ggtt_remove;
+
+	ggtt->invalidate = gmch_ggtt_invalidate;
+
+	ggtt->vm.vma_ops.bind_vma    = intel_ggtt_bind_vma;
+	ggtt->vm.vma_ops.unbind_vma  = intel_ggtt_unbind_vma;
+
+	if (unlikely(ggtt->do_idle_maps))
+		drm_notice(&i915->drm,
+			   "Applying Ironlake quirks for intel_iommu\n");
+
+	return 0;
+}
+
+int intel_ggtt_gmch_enable_hw(struct drm_i915_private *i915)
+{
+	if (!intel_gmch_enable_gtt())
+		return -EIO;
+
+	return 0;
+}
+
+void intel_ggtt_gmch_flush(void)
+{
+	intel_gmch_gtt_flush();
+}

drivers/gpu/drm/i915/gt/intel_ggtt_gmch.h

+/* SPDX-License-Identifier: MIT */
+/*
+ * Copyright © 2022 Intel Corporation
+ */
+
+#ifndef __INTEL_GGTT_GMCH_H__
+#define __INTEL_GGTT_GMCH_H__
+
+#include "intel_gtt.h"
+
+/* For x86 platforms */
+#if IS_ENABLED(CONFIG_X86)
+
+void intel_ggtt_gmch_flush(void);
+int intel_ggtt_gmch_enable_hw(struct drm_i915_private *i915);
+int intel_ggtt_gmch_probe(struct i915_ggtt *ggtt);
+
+/* Stubs for non-x86 platforms */
+#else
+
+static inline void intel_ggtt_gmch_flush(void) { }
+static inline int intel_ggtt_gmch_enable_hw(struct drm_i915_private *i915) { return -ENODEV; }
+static inline int intel_ggtt_gmch_probe(struct i915_ggtt *ggtt) { return -ENODEV; }
+
+#endif
+
+#endif /* __INTEL_GGTT_GMCH_H__ */

drivers/gpu/drm/i915/gt/intel_gt.c

@@ -4,6 +4,7 @@
  */
 
 #include <drm/drm_managed.h>
+#include <drm/intel-gtt.h>
 
 #include "gem/i915_gem_internal.h"
 #include "gem/i915_gem_lmem.h"
@@ -12,11 +13,11 @@
 #include "i915_drv.h"
 #include "intel_context.h"
 #include "intel_engine_regs.h"
+#include "intel_ggtt_gmch.h"
 #include "intel_gt.h"
 #include "intel_gt_buffer_pool.h"
 #include "intel_gt_clock_utils.h"
 #include "intel_gt_debugfs.h"
-#include "intel_gt_gmch.h"
 #include "intel_gt_mcr.h"
 #include "intel_gt_pm.h"
 #include "intel_gt_regs.h"
@@ -387,7 +388,7 @@ void intel_gt_chipset_flush(struct intel_gt *gt)
 {
 	wmb();
 	if (GRAPHICS_VER(gt->i915) < 6)
-		intel_gt_gmch_gen5_chipset_flush(gt);
+		intel_ggtt_gmch_flush();
 }
 
 void intel_gt_driver_register(struct intel_gt *gt)

drivers/gpu/drm/i915/gt/intel_gt.h

@@ -13,13 +13,6 @@
 struct drm_i915_private;
 struct drm_printer;
 
-struct insert_entries {
-	struct i915_address_space *vm;
-	struct i915_vma_resource *vma_res;
-	enum i915_cache_level level;
-	u32 flags;
-};
-
 #define GT_TRACE(gt, fmt, ...) do {					\
 	const struct intel_gt *gt__ __maybe_unused = (gt);		\
 	GEM_TRACE("%s " fmt, dev_name(gt__->i915->drm.dev),		\
@@ -110,6 +103,4 @@ void intel_gt_watchdog_work(struct work_struct *work);
 
 void intel_gt_invalidate_tlbs(struct intel_gt *gt);
 
-struct resource intel_pci_resource(struct pci_dev *pdev, int bar);
-
 #endif /* __INTEL_GT_H__ */

drivers/gpu/drm/i915/gt/intel_gt_gmch.c

-// SPDX-License-Identifier: MIT
-/*
- * Copyright © 2022 Intel Corporation
- */
-
-#include <drm/intel-gtt.h>
-#include <drm/i915_drm.h>
-
-#include <linux/agp_backend.h>
-#include <linux/stop_machine.h>
-
-#include "i915_drv.h"
-#include "intel_gt_gmch.h"
-#include "intel_gt_regs.h"
-#include "intel_gt.h"
-#include "i915_utils.h"
-
-#include "gen8_ppgtt.h"
-
-struct insert_page {
-	struct i915_address_space *vm;
-	dma_addr_t addr;
-	u64 offset;
-	enum i915_cache_level level;
-};
-
-static void gen8_set_pte(void __iomem *addr, gen8_pte_t pte)
-{
-	writeq(pte, addr);
-}
-
-static void nop_clear_range(struct i915_address_space *vm,
-			    u64 start, u64 length)
-{
-}
-
-static u64 snb_pte_encode(dma_addr_t addr,
-			  enum i915_cache_level level,
-			  u32 flags)
-{
-	gen6_pte_t pte = GEN6_PTE_ADDR_ENCODE(addr) | GEN6_PTE_VALID;
-
-	switch (level) {
-	case I915_CACHE_L3_LLC:
-	case I915_CACHE_LLC:
-		pte |= GEN6_PTE_CACHE_LLC;
-		break;
-	case I915_CACHE_NONE:
-		pte |= GEN6_PTE_UNCACHED;
-		break;
-	default:
-		MISSING_CASE(level);
-	}
-
-	return pte;
-}
-
-static u64 ivb_pte_encode(dma_addr_t addr,
-			  enum i915_cache_level level,
-			  u32 flags)
-{
-	gen6_pte_t pte = GEN6_PTE_ADDR_ENCODE(addr) | GEN6_PTE_VALID;
-
-	switch (level) {
-	case I915_CACHE_L3_LLC:
-		pte |= GEN7_PTE_CACHE_L3_LLC;
-		break;
-	case I915_CACHE_LLC:
-		pte |= GEN6_PTE_CACHE_LLC;
-		break;
-	case I915_CACHE_NONE:
-		pte |= GEN6_PTE_UNCACHED;
-		break;
-	default:
-		MISSING_CASE(level);
-	}
-
-	return pte;
-}
-
-static u64 byt_pte_encode(dma_addr_t addr,
-			  enum i915_cache_level level,
-			  u32 flags)
-{
-	gen6_pte_t pte = GEN6_PTE_ADDR_ENCODE(addr) | GEN6_PTE_VALID;
-
-	if (!(flags & PTE_READ_ONLY))
-		pte |= BYT_PTE_WRITEABLE;
-
-	if (level != I915_CACHE_NONE)
-		pte |= BYT_PTE_SNOOPED_BY_CPU_CACHES;
-
-	return pte;
-}
-
-static u64 hsw_pte_encode(dma_addr_t addr,
-			  enum i915_cache_level level,
-			  u32 flags)
-{
-	gen6_pte_t pte = HSW_PTE_ADDR_ENCODE(addr) | GEN6_PTE_VALID;
-
-	if (level != I915_CACHE_NONE)
-		pte |= HSW_WB_LLC_AGE3;
-
-	return pte;
-}
-
-static u64 iris_pte_encode(dma_addr_t addr,
-			   enum i915_cache_level level,
-			   u32 flags)
-{
-	gen6_pte_t pte = HSW_PTE_ADDR_ENCODE(addr) | GEN6_PTE_VALID;
-
-	switch (level) {
-	case I915_CACHE_NONE:
-		break;
-	case I915_CACHE_WT:
-		pte |= HSW_WT_ELLC_LLC_AGE3;
-		break;
-	default:
-		pte |= HSW_WB_ELLC_LLC_AGE3;
-		break;
-	}
-
-	return pte;
-}
-
-static void gen5_ggtt_insert_page(struct i915_address_space *vm,
-				  dma_addr_t addr,
-				  u64 offset,
-				  enum i915_cache_level cache_level,
-				  u32 unused)
-{
-	unsigned int flags = (cache_level == I915_CACHE_NONE) ?
-		AGP_USER_MEMORY : AGP_USER_CACHED_MEMORY;
-
-	intel_gmch_gtt_insert_page(addr, offset >> PAGE_SHIFT, flags);
-}
-
-static void gen6_ggtt_insert_page(struct i915_address_space *vm,
-				  dma_addr_t addr,
-				  u64 offset,
-				  enum i915_cache_level level,
-				  u32 flags)
-{
-	struct i915_ggtt *ggtt = i915_vm_to_ggtt(vm);
-	gen6_pte_t __iomem *pte =
-		(gen6_pte_t __iomem *)ggtt->gsm + offset / I915_GTT_PAGE_SIZE;
-
-	iowrite32(vm->pte_encode(addr, level, flags), pte);
-
-	ggtt->invalidate(ggtt);
-}
-
-static void gen8_ggtt_insert_page(struct i915_address_space *vm,
-				  dma_addr_t addr,
-				  u64 offset,
-				  enum i915_cache_level level,
-				  u32 flags)
-{
-	struct i915_ggtt *ggtt = i915_vm_to_ggtt(vm);
-	gen8_pte_t __iomem *pte =
-		(gen8_pte_t __iomem *)ggtt->gsm + offset / I915_GTT_PAGE_SIZE;
-
-	gen8_set_pte(pte, gen8_ggtt_pte_encode(addr, level, flags));
-
-	ggtt->invalidate(ggtt);
-}
-
-static void gen5_ggtt_insert_entries(struct i915_address_space *vm,
-				     struct i915_vma_resource *vma_res,
-				     enum i915_cache_level cache_level,
-				     u32 unused)
-{
-	unsigned int flags = (cache_level == I915_CACHE_NONE) ?
-		AGP_USER_MEMORY : AGP_USER_CACHED_MEMORY;
-
-	intel_gmch_gtt_insert_sg_entries(vma_res->bi.pages, vma_res->start >> PAGE_SHIFT,
-					 flags);
-}
-
-/*
- * Binds an object into the global gtt with the specified cache level.
- * The object will be accessible to the GPU via commands whose operands
- * reference offsets within the global GTT as well as accessible by the GPU
- * through the GMADR mapped BAR (i915->mm.gtt->gtt).
- */
-static void gen6_ggtt_insert_entries(struct i915_address_space *vm,
-				     struct i915_vma_resource *vma_res,
-				     enum i915_cache_level level,
-				     u32 flags)
-{
-	struct i915_ggtt *ggtt = i915_vm_to_ggtt(vm);
-	gen6_pte_t __iomem *gte;
-	gen6_pte_t __iomem *end;
-	struct sgt_iter iter;
-	dma_addr_t addr;
-
-	gte = (gen6_pte_t __iomem *)ggtt->gsm;
-	gte += vma_res->start / I915_GTT_PAGE_SIZE;
-	end = gte + vma_res->node_size / I915_GTT_PAGE_SIZE;
-
-	for_each_sgt_daddr(addr, iter, vma_res->bi.pages)
-		iowrite32(vm->pte_encode(addr, level, flags), gte++);
-	GEM_BUG_ON(gte > end);
-
-	/* Fill the allocated but "unused" space beyond the end of the buffer */
-	while (gte < end)
-		iowrite32(vm->scratch[0]->encode, gte++);
-
-	/*
-	 * We want to flush the TLBs only after we're certain all the PTE
-	 * updates have finished.
-	 */
-	ggtt->invalidate(ggtt);
-}
-
-static void gen8_ggtt_insert_entries(struct i915_address_space *vm,
-				     struct i915_vma_resource *vma_res,
-				     enum i915_cache_level level,
-				     u32 flags)
-{
-	const gen8_pte_t pte_encode = gen8_ggtt_pte_encode(0, level, flags);
-	struct i915_ggtt *ggtt = i915_vm_to_ggtt(vm);
-	gen8_pte_t __iomem *gte;
-	gen8_pte_t __iomem *end;
-	struct sgt_iter iter;
-	dma_addr_t addr;
-
-	/*
-	 * Note that we ignore PTE_READ_ONLY here. The caller must be careful
-	 * not to allow the user to override access to a read only page.
-	 */
-
-	gte = (gen8_pte_t __iomem *)ggtt->gsm;
-	gte += vma_res->start / I915_GTT_PAGE_SIZE;
-	end = gte + vma_res->node_size / I915_GTT_PAGE_SIZE;
-
-	for_each_sgt_daddr(addr, iter, vma_res->bi.pages)
-		gen8_set_pte(gte++, pte_encode | addr);
-	GEM_BUG_ON(gte > end);
-
-	/* Fill the allocated but "unused" space beyond the end of the buffer */
-	while (gte < end)
-		gen8_set_pte(gte++, vm->scratch[0]->encode);
-
-	/*
-	 * We want to flush the TLBs only after we're certain all the PTE
-	 * updates have finished.
-	 */
-	ggtt->invalidate(ggtt);
-}
-
-static void bxt_vtd_ggtt_wa(struct i915_address_space *vm)
-{
-	/*
-	 * Make sure the internal GAM fifo has been cleared of all GTT
-	 * writes before exiting stop_machine(). This guarantees that
-	 * any aperture accesses waiting to start in another process
-	 * cannot back up behind the GTT writes causing a hang.
-	 * The register can be any arbitrary GAM register.
-	 */
-	intel_uncore_posting_read_fw(vm->gt->uncore, GFX_FLSH_CNTL_GEN6);
-}
-
-static int bxt_vtd_ggtt_insert_page__cb(void *_arg)
-{
-	struct insert_page *arg = _arg;
-
-	gen8_ggtt_insert_page(arg->vm, arg->addr, arg->offset, arg->level, 0);
-	bxt_vtd_ggtt_wa(arg->vm);
-
-	return 0;
-}
-
-static void bxt_vtd_ggtt_insert_page__BKL(struct i915_address_space *vm,
-					  dma_addr_t addr,
-					  u64 offset,
-					  enum i915_cache_level level,
-					  u32 unused)
-{
-	struct insert_page arg = { vm, addr, offset, level };
-
-	stop_machine(bxt_vtd_ggtt_insert_page__cb, &arg, NULL);
-}
-
-static int bxt_vtd_ggtt_insert_entries__cb(void *_arg)
-{
-	struct insert_entries *arg = _arg;
-
-	gen8_ggtt_insert_entries(arg->vm, arg->vma_res, arg->level, arg->flags);
-	bxt_vtd_ggtt_wa(arg->vm);
-
-	return 0;
-}
-
-static void bxt_vtd_ggtt_insert_entries__BKL(struct i915_address_space *vm,
-					     struct i915_vma_resource *vma_res,
-					     enum i915_cache_level level,
-					     u32 flags)
-{
-	struct insert_entries arg = { vm, vma_res, level, flags };
-
-	stop_machine(bxt_vtd_ggtt_insert_entries__cb, &arg, NULL);
-}
-
-void intel_gt_gmch_gen5_chipset_flush(struct intel_gt *gt)
-{
-	intel_gmch_gtt_flush();
-}
-
-static void gmch_ggtt_invalidate(struct i915_ggtt *ggtt)
-{
-	intel_gmch_gtt_flush();
-}
-
-static void gen5_ggtt_clear_range(struct i915_address_space *vm,
-					 u64 start, u64 length)
-{
-	intel_gmch_gtt_clear_range(start >> PAGE_SHIFT, length >> PAGE_SHIFT);
-}
-
-static void gen6_ggtt_clear_range(struct i915_address_space *vm,
-				  u64 start, u64 length)
-{
-	struct i915_ggtt *ggtt = i915_vm_to_ggtt(vm);
-	unsigned int first_entry = start / I915_GTT_PAGE_SIZE;
-	unsigned int num_entries = length / I915_GTT_PAGE_SIZE;
-	gen6_pte_t scratch_pte, __iomem *gtt_base =
-		(gen6_pte_t __iomem *)ggtt->gsm + first_entry;
-	const int max_entries = ggtt_total_entries(ggtt) - first_entry;
-	int i;
-
-	if (WARN(num_entries > max_entries,
-		 "First entry = %d; Num entries = %d (max=%d)\n",
-		 first_entry, num_entries, max_entries))
-		num_entries = max_entries;
-
-	scratch_pte = vm->scratch[0]->encode;
-	for (i = 0; i < num_entries; i++)
-		iowrite32(scratch_pte, &gtt_base[i]);
-}
-
-static void gen8_ggtt_clear_range(struct i915_address_space *vm,
-				  u64 start, u64 length)
-{
-	struct i915_ggtt *ggtt = i915_vm_to_ggtt(vm);
-	unsigned int first_entry = start / I915_GTT_PAGE_SIZE;
-	unsigned int num_entries = length / I915_GTT_PAGE_SIZE;
-	const gen8_pte_t scratch_pte = vm->scratch[0]->encode;
-	gen8_pte_t __iomem *gtt_base =
-		(gen8_pte_t __iomem *)ggtt->gsm + first_entry;
-	const int max_entries = ggtt_total_entries(ggtt) - first_entry;
-	int i;
-
-	if (WARN(num_entries > max_entries,
-		 "First entry = %d; Num entries = %d (max=%d)\n",
-		 first_entry, num_entries, max_entries))
-		num_entries = max_entries;
-
-	for (i = 0; i < num_entries; i++)
-		gen8_set_pte(&gtt_base[i], scratch_pte);
-}
-
-static void gen5_gmch_remove(struct i915_address_space *vm)
-{
-	intel_gmch_remove();
-}
-
-static void gen6_gmch_remove(struct i915_address_space *vm)
-{
-	struct i915_ggtt *ggtt = i915_vm_to_ggtt(vm);
-
-	iounmap(ggtt->gsm);
-	free_scratch(vm);
-}
-
-/*
- * Certain Gen5 chipsets require idling the GPU before
- * unmapping anything from the GTT when VT-d is enabled.
- */
-static bool needs_idle_maps(struct drm_i915_private *i915)
-{
-	/*
-	 * Query intel_iommu to see if we need the workaround. Presumably that
-	 * was loaded first.
-	 */
-	if (!i915_vtd_active(i915))
-		return false;
-
-	if (GRAPHICS_VER(i915) == 5 && IS_MOBILE(i915))
-		return true;
-
-	if (GRAPHICS_VER(i915) == 12)
-		return true; /* XXX DMAR fault reason 7 */
-
-	return false;
-}
-
-static unsigned int gen6_gttmmadr_size(struct drm_i915_private *i915)
-{
-	/*
-	 * GEN6: GTTMMADR size is 4MB and GTTADR starts at 2MB offset
-	 * GEN8: GTTMMADR size is 16MB and GTTADR starts at 8MB offset
-	 */
-	GEM_BUG_ON(GRAPHICS_VER(i915) < 6);
-	return (GRAPHICS_VER(i915) < 8) ? SZ_4M : SZ_16M;
-}
-
-static unsigned int gen6_get_total_gtt_size(u16 snb_gmch_ctl)
-{
-	snb_gmch_ctl >>= SNB_GMCH_GGMS_SHIFT;
-	snb_gmch_ctl &= SNB_GMCH_GGMS_MASK;
-	return snb_gmch_ctl << 20;
-}
-
-static unsigned int gen8_get_total_gtt_size(u16 bdw_gmch_ctl)
-{
-	bdw_gmch_ctl >>= BDW_GMCH_GGMS_SHIFT;
-	bdw_gmch_ctl &= BDW_GMCH_GGMS_MASK;
-	if (bdw_gmch_ctl)
-		bdw_gmch_ctl = 1 << bdw_gmch_ctl;
-
-#ifdef CONFIG_X86_32
-	/* Limit 32b platforms to a 2GB GGTT: 4 << 20 / pte size * I915_GTT_PAGE_SIZE */
-	if (bdw_gmch_ctl > 4)
-		bdw_gmch_ctl = 4;
-#endif
-
-	return bdw_gmch_ctl << 20;
-}
-
-static unsigned int gen6_gttadr_offset(struct drm_i915_private *i915)
-{
-	return gen6_gttmmadr_size(i915) / 2;
-}
-
-static int ggtt_probe_common(struct i915_ggtt *ggtt, u64 size)
-{
-	struct drm_i915_private *i915 = ggtt->vm.i915;
-	struct pci_dev *pdev = to_pci_dev(i915->drm.dev);
-	phys_addr_t phys_addr;
-	u32 pte_flags;
-	int ret;
-
-	GEM_WARN_ON(pci_resource_len(pdev, 0) != gen6_gttmmadr_size(i915));
-	phys_addr = pci_resource_start(pdev, 0) + gen6_gttadr_offset(i915);
-
-	/*
-	 * On BXT+/ICL+ writes larger than 64 bit to the GTT pagetable range
-	 * will be dropped. For WC mappings in general we have 64 byte burst
-	 * writes when the WC buffer is flushed, so we can't use it, but have to
-	 * resort to an uncached mapping. The WC issue is easily caught by the
-	 * readback check when writing GTT PTE entries.
-	 */
-	if (IS_GEN9_LP(i915) || GRAPHICS_VER(i915) >= 11)
-		ggtt->gsm = ioremap(phys_addr, size);
-	else
-		ggtt->gsm = ioremap_wc(phys_addr, size);
-	if (!ggtt->gsm) {
-		drm_err(&i915->drm, "Failed to map the ggtt page table\n");
-		return -ENOMEM;
-	}
-
-	kref_init(&ggtt->vm.resv_ref);
-	ret = setup_scratch_page(&ggtt->vm);
-	if (ret) {
-		drm_err(&i915->drm, "Scratch setup failed\n");
-		/* iounmap will also get called at remove, but meh */
-		iounmap(ggtt->gsm);
-		return ret;
-	}
-
-	pte_flags = 0;
-	if (i915_gem_object_is_lmem(ggtt->vm.scratch[0]))
-		pte_flags |= PTE_LM;
-
-	ggtt->vm.scratch[0]->encode =
-		ggtt->vm.pte_encode(px_dma(ggtt->vm.scratch[0]),
-				    I915_CACHE_NONE, pte_flags);
-
-	return 0;
-}
-
-int intel_gt_gmch_gen5_probe(struct i915_ggtt *ggtt)
-{
-	struct drm_i915_private *i915 = ggtt->vm.i915;
-	phys_addr_t gmadr_base;
-	int ret;
-
-	ret = intel_gmch_probe(i915->bridge_dev, to_pci_dev(i915->drm.dev), NULL);
-	if (!ret) {
-		drm_err(&i915->drm, "failed to set up gmch\n");
-		return -EIO;
-	}
-
-	intel_gmch_gtt_get(&ggtt->vm.total, &gmadr_base, &ggtt->mappable_end);
-
-	ggtt->gmadr =
-		(struct resource)DEFINE_RES_MEM(gmadr_base, ggtt->mappable_end);
-
-	ggtt->vm.alloc_pt_dma = alloc_pt_dma;
-	ggtt->vm.alloc_scratch_dma = alloc_pt_dma;
-
-	if (needs_idle_maps(i915)) {
-		drm_notice(&i915->drm,
-			   "Flushing DMA requests before IOMMU unmaps; performance may be degraded\n");
-		ggtt->do_idle_maps = true;
-	}
-
-	ggtt->vm.insert_page = gen5_ggtt_insert_page;
-	ggtt->vm.insert_entries = gen5_ggtt_insert_entries;
-	ggtt->vm.clear_range = gen5_ggtt_clear_range;
-	ggtt->vm.cleanup = gen5_gmch_remove;
-
-	ggtt->invalidate = gmch_ggtt_invalidate;
-
-	ggtt->vm.vma_ops.bind_vma    = intel_ggtt_bind_vma;
-	ggtt->vm.vma_ops.unbind_vma  = intel_ggtt_unbind_vma;
-
-	if (unlikely(ggtt->do_idle_maps))
-		drm_notice(&i915->drm,
-			   "Applying Ironlake quirks for intel_iommu\n");
-
-	return 0;
-}
-
-int intel_gt_gmch_gen6_probe(struct i915_ggtt *ggtt)
-{
-	struct drm_i915_private *i915 = ggtt->vm.i915;
-	struct pci_dev *pdev = to_pci_dev(i915->drm.dev);
-	unsigned int size;
-	u16 snb_gmch_ctl;
-
-	ggtt->gmadr = intel_pci_resource(pdev, 2);
-	ggtt->mappable_end = resource_size(&ggtt->gmadr);
-
-	/*
-	 * 64/512MB is the current min/max we actually know of, but this is
-	 * just a coarse sanity check.
-	 */
-	if (ggtt->mappable_end < (64<<20) || ggtt->mappable_end > (512<<20)) {
-		drm_err(&i915->drm, "Unknown GMADR size (%pa)\n",
-			&ggtt->mappable_end);
-		return -ENXIO;
-	}
-
-	pci_read_config_word(pdev, SNB_GMCH_CTRL, &snb_gmch_ctl);
-
-	size = gen6_get_total_gtt_size(snb_gmch_ctl);
-	ggtt->vm.total = (size / sizeof(gen6_pte_t)) * I915_GTT_PAGE_SIZE;
-
-	ggtt->vm.alloc_pt_dma = alloc_pt_dma;
-	ggtt->vm.alloc_scratch_dma = alloc_pt_dma;
-
-	ggtt->vm.clear_range = nop_clear_range;
-	if (!HAS_FULL_PPGTT(i915) || intel_scanout_needs_vtd_wa(i915))
-		ggtt->vm.clear_range = gen6_ggtt_clear_range;
-	ggtt->vm.insert_page = gen6_ggtt_insert_page;
-	ggtt->vm.insert_entries = gen6_ggtt_insert_entries;
-	ggtt->vm.cleanup = gen6_gmch_remove;
-
-	ggtt->invalidate = gen6_ggtt_invalidate;
-
-	if (HAS_EDRAM(i915))
-		ggtt->vm.pte_encode = iris_pte_encode;
-	else if (IS_HASWELL(i915))
-		ggtt->vm.pte_encode = hsw_pte_encode;
-	else if (IS_VALLEYVIEW(i915))
-		ggtt->vm.pte_encode = byt_pte_encode;
-	else if (GRAPHICS_VER(i915) >= 7)
-		ggtt->vm.pte_encode = ivb_pte_encode;
-	else
-		ggtt->vm.pte_encode = snb_pte_encode;
-
-	ggtt->vm.vma_ops.bind_vma    = intel_ggtt_bind_vma;
-	ggtt->vm.vma_ops.unbind_vma  = intel_ggtt_unbind_vma;
-
-	return ggtt_probe_common(ggtt, size);
-}
-
-static unsigned int chv_get_total_gtt_size(u16 gmch_ctrl)
-{
-	gmch_ctrl >>= SNB_GMCH_GGMS_SHIFT;
-	gmch_ctrl &= SNB_GMCH_GGMS_MASK;
-
-	if (gmch_ctrl)
-		return 1 << (20 + gmch_ctrl);
-
-	return 0;
-}
-
-int intel_gt_gmch_gen8_probe(struct i915_ggtt *ggtt)
-{
-	struct drm_i915_private *i915 = ggtt->vm.i915;
-	struct pci_dev *pdev = to_pci_dev(i915->drm.dev);
-	unsigned int size;
-	u16 snb_gmch_ctl;
-
-	/* TODO: We're not aware of mappable constraints on gen8 yet */
-	if (!HAS_LMEM(i915)) {
-		ggtt->gmadr = intel_pci_resource(pdev, 2);
-		ggtt->mappable_end = resource_size(&ggtt->gmadr);
-	}
-
-	pci_read_config_word(pdev, SNB_GMCH_CTRL, &snb_gmch_ctl);
-	if (IS_CHERRYVIEW(i915))
-		size = chv_get_total_gtt_size(snb_gmch_ctl);
-	else
-		size = gen8_get_total_gtt_size(snb_gmch_ctl);
-
-	ggtt->vm.alloc_pt_dma = alloc_pt_dma;
-	ggtt->vm.alloc_scratch_dma = alloc_pt_dma;
-	ggtt->vm.lmem_pt_obj_flags = I915_BO_ALLOC_PM_EARLY;
-
-	ggtt->vm.total = (size / sizeof(gen8_pte_t)) * I915_GTT_PAGE_SIZE;
-	ggtt->vm.cleanup = gen6_gmch_remove;
-	ggtt->vm.insert_page = gen8_ggtt_insert_page;
-	ggtt->vm.clear_range = nop_clear_range;
-	if (intel_scanout_needs_vtd_wa(i915))
-		ggtt->vm.clear_range = gen8_ggtt_clear_range;
-
-	ggtt->vm.insert_entries = gen8_ggtt_insert_entries;
-
-	/*
-	 * Serialize GTT updates with aperture access on BXT if VT-d is on,
-	 * and always on CHV.
-	 */
-	if (intel_vm_no_concurrent_access_wa(i915)) {
-		ggtt->vm.insert_entries = bxt_vtd_ggtt_insert_entries__BKL;
-		ggtt->vm.insert_page    = bxt_vtd_ggtt_insert_page__BKL;
-		ggtt->vm.bind_async_flags =
-			I915_VMA_GLOBAL_BIND | I915_VMA_LOCAL_BIND;
-	}
-
-	ggtt->invalidate = gen8_ggtt_invalidate;
-
-	ggtt->vm.vma_ops.bind_vma    = intel_ggtt_bind_vma;
-	ggtt->vm.vma_ops.unbind_vma  = intel_ggtt_unbind_vma;
-
-	ggtt->vm.pte_encode = gen8_ggtt_pte_encode;
-
-	setup_private_pat(ggtt->vm.gt->uncore);
-
-	return ggtt_probe_common(ggtt, size);
-}
-
-int intel_gt_gmch_gen5_enable_hw(struct drm_i915_private *i915)
-{
-	if (GRAPHICS_VER(i915) < 6 && !intel_gmch_enable_gtt())
-		return -EIO;
-
-	return 0;
-}

drivers/gpu/drm/i915/gt/intel_gt_gmch.h

-/* SPDX-License-Identifier: MIT */
-/*
- * Copyright © 2022 Intel Corporation
- */
-
-#ifndef __INTEL_GT_GMCH_H__
-#define __INTEL_GT_GMCH_H__
-
-#include "intel_gtt.h"
-
-/* For x86 platforms */
-#if IS_ENABLED(CONFIG_X86)
-void intel_gt_gmch_gen5_chipset_flush(struct intel_gt *gt);
-int intel_gt_gmch_gen6_probe(struct i915_ggtt *ggtt);
-int intel_gt_gmch_gen8_probe(struct i915_ggtt *ggtt);
-int intel_gt_gmch_gen5_probe(struct i915_ggtt *ggtt);
-int intel_gt_gmch_gen5_enable_hw(struct drm_i915_private *i915);
-
-/* Stubs for non-x86 platforms */
-#else
-static inline void intel_gt_gmch_gen5_chipset_flush(struct intel_gt *gt)
-{
-}
-static inline int intel_gt_gmch_gen5_probe(struct i915_ggtt *ggtt)
-{
-	/* No HW should be probed for this case yet, return fail */
-	return -ENODEV;
-}
-static inline int intel_gt_gmch_gen6_probe(struct i915_ggtt *ggtt)
-{
-	/* No HW should be probed for this case yet, return fail */
-	return -ENODEV;
-}
-static inline int intel_gt_gmch_gen8_probe(struct i915_ggtt *ggtt)
-{
-	/* No HW should be probed for this case yet, return fail */
-	return -ENODEV;
-}
-static inline int intel_gt_gmch_gen5_enable_hw(struct drm_i915_private *i915)
-{
-	/* No HW should be enabled for this case yet, return fail */
-	return -ENODEV;
-}
-#endif
-
-#endif /* __INTEL_GT_GMCH_H__ */

drivers/gpu/drm/i915/gt/intel_gtt.h

@@ -561,7 +561,6 @@ i915_page_dir_dma_addr(const struct i915_ppgtt *ppgtt, const unsigned int n)
 
 void ppgtt_init(struct i915_ppgtt *ppgtt, struct intel_gt *gt,
 		unsigned long lmem_pt_obj_flags);
-
 void intel_ggtt_bind_vma(struct i915_address_space *vm,
 			 struct i915_vm_pt_stash *stash,
 			 struct i915_vma_resource *vma_res,
@@ -651,7 +650,6 @@ release_pd_entry(struct i915_page_directory * const pd,
 		 struct i915_page_table * const pt,
 		 const struct drm_i915_gem_object * const scratch);
 void gen6_ggtt_invalidate(struct i915_ggtt *ggtt);
-void gen8_ggtt_invalidate(struct i915_ggtt *ggtt);
 
 void ppgtt_bind_vma(struct i915_address_space *vm,
 		    struct i915_vm_pt_stash *stash,