From: Akeem G Abodunrin akeem.g.abodunrin@intel.com
On client platforms with reduced LMEM BAR, we should be able to continue with driver load with reduced io_size. Instead of using the BAR size to determine the how large stolen should be, we should instead use the ADDR_RANGE register to figure this out(at least on platforms like DG2). For simplicity we don't attempt to support partially mappable stolen.
Signed-off-by: Akeem G Abodunrin akeem.g.abodunrin@intel.com Co-developed-by: Matthew Auld matthew.auld@intel.com Signed-off-by: Matthew Auld matthew.auld@intel.com Cc: Thomas Hellström thomas.hellstrom@linux.intel.com Acked-by: Nirmoy Das nirmoy.das@intel.com --- drivers/gpu/drm/i915/gem/i915_gem_stolen.c | 48 ++++++++++++++++------ drivers/gpu/drm/i915/i915_reg.h | 3 ++ 2 files changed, 38 insertions(+), 13 deletions(-)
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_stolen.c b/drivers/gpu/drm/i915/gem/i915_gem_stolen.c index 0bf8f61134af..6df1600708a7 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_stolen.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_stolen.c @@ -12,6 +12,8 @@
#include "gem/i915_gem_lmem.h" #include "gem/i915_gem_region.h" +#include "gt/intel_gt.h" +#include "gt/intel_region_lmem.h" #include "i915_drv.h" #include "i915_gem_stolen.h" #include "i915_reg.h" @@ -750,9 +752,9 @@ static int init_stolen_lmem(struct intel_memory_region *mem) if (GEM_WARN_ON(resource_size(&mem->region) == 0)) return -ENODEV;
- if (!io_mapping_init_wc(&mem->iomap, - mem->io_start, - mem->io_size)) + if (mem->io_size && !io_mapping_init_wc(&mem->iomap, + mem->io_start, + mem->io_size)) return -EIO;
/* @@ -773,7 +775,8 @@ static int init_stolen_lmem(struct intel_memory_region *mem)
static int release_stolen_lmem(struct intel_memory_region *mem) { - io_mapping_fini(&mem->iomap); + if (mem->io_size) + io_mapping_fini(&mem->iomap); i915_gem_cleanup_stolen(mem->i915); return 0; } @@ -790,25 +793,43 @@ i915_gem_stolen_lmem_setup(struct drm_i915_private *i915, u16 type, { struct intel_uncore *uncore = &i915->uncore; struct pci_dev *pdev = to_pci_dev(i915->drm.dev); + resource_size_t dsm_size, dsm_base, lmem_size; struct intel_memory_region *mem; + resource_size_t io_start, io_size; resource_size_t min_page_size; - resource_size_t io_start; - resource_size_t lmem_size; - u64 lmem_base;
- lmem_base = intel_uncore_read64(uncore, GEN12_DSMBASE); - if (GEM_WARN_ON(lmem_base >= pci_resource_len(pdev, 2))) + if (WARN_ON_ONCE(instance)) return ERR_PTR(-ENODEV);
- lmem_size = pci_resource_len(pdev, 2) - lmem_base; - io_start = pci_resource_start(pdev, 2) + lmem_base; + /* Use DSM base address instead for stolen memory */ + dsm_base = intel_uncore_read64(uncore, GEN12_DSMBASE); + if (IS_DG1(uncore->i915)) { + lmem_size = pci_resource_len(pdev, 2); + if (WARN_ON(lmem_size < dsm_base)) + return ERR_PTR(-ENODEV); + } else { + resource_size_t lmem_range; + + lmem_range = intel_gt_read_register(&i915->gt0, XEHPSDV_TILE0_ADDR_RANGE) & 0xFFFF; + lmem_size = lmem_range >> XEHPSDV_TILE_LMEM_RANGE_SHIFT; + lmem_size *= SZ_1G; + } + + dsm_size = lmem_size - dsm_base; + if (pci_resource_len(pdev, 2) < lmem_size) { + io_start = 0; + io_size = 0; + } else { + io_start = pci_resource_start(pdev, 2) + dsm_base; + io_size = dsm_size; + }
min_page_size = HAS_64K_PAGES(i915) ? I915_GTT_PAGE_SIZE_64K : I915_GTT_PAGE_SIZE_4K;
- mem = intel_memory_region_create(i915, lmem_base, lmem_size, + mem = intel_memory_region_create(i915, dsm_base, dsm_size, min_page_size, - io_start, lmem_size, + io_start, io_size, type, instance, &i915_region_stolen_lmem_ops); if (IS_ERR(mem)) @@ -822,6 +843,7 @@ i915_gem_stolen_lmem_setup(struct drm_i915_private *i915, u16 type,
drm_dbg(&i915->drm, "Stolen Local memory IO start: %pa\n", &mem->io_start); + drm_dbg(&i915->drm, "Stolen Local DSM base: %pa\n", &dsm_base);
intel_memory_region_set_name(mem, "stolen-local");
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h index ddbc7a685a50..4a10b00a585b 100644 --- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -8468,6 +8468,9 @@ enum skl_power_gate { #define SGGI_DIS REG_BIT(15) #define SGR_DIS REG_BIT(13)
+#define XEHPSDV_TILE0_ADDR_RANGE _MMIO(0x4900) +#define XEHPSDV_TILE_LMEM_RANGE_SHIFT 8 + #define XEHPSDV_FLAT_CCS_BASE_ADDR _MMIO(0x4910) #define XEHPSDV_CCS_BASE_SHIFT 8