On 20/04/2021 17:06, Tvrtko Ursulin wrote:
On 20/04/2021 14:18, Matthew Auld wrote:
From: CQ Tang cq.tang@intel.com
Add "REGION_STOLEN" device info to dg1, create stolen memory region from upper portion of local device memory, starting from DSMBASE.
v2: - s/drm_info/drm_dbg; userspace likely doesn't care about stolen. - mem->type is only setup after the region probe, so setting the name as stolen-local or stolen-system based on this value won't work. Split system vs local stolen setup to fix this. - kill all the region->devmem/is_devmem stuff. We already differentiate the different types of stolen so such things shouldn't be needed anymore. v3: - split stolen lmem vs smem ops(Tvrtko) - add shortcut for stolen region in i915(Tvrtko) - sanity check dsm base vs bar size(Xinyun)
Signed-off-by: CQ Tang cq.tang@intel.com Signed-off-by: Matthew Auld matthew.auld@intel.com Cc: Tvrtko Ursulin tvrtko.ursulin@linux.intel.com Cc: Xinyun Liu xinyun.liu@intel.com
drivers/gpu/drm/i915/gem/i915_gem_stolen.c | 137 ++++++++++++++++++--- drivers/gpu/drm/i915/i915_drv.h | 7 ++ drivers/gpu/drm/i915/i915_pci.c | 2 +- drivers/gpu/drm/i915/i915_reg.h | 1 + drivers/gpu/drm/i915/intel_memory_region.c | 8 ++ drivers/gpu/drm/i915/intel_memory_region.h | 5 +- 6 files changed, 140 insertions(+), 20 deletions(-)
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_stolen.c b/drivers/gpu/drm/i915/gem/i915_gem_stolen.c index b0597de206de..2ed1ca9aec75 100644 --- a/drivers/gpu/drm/i915/gem/i915_gem_stolen.c +++ b/drivers/gpu/drm/i915/gem/i915_gem_stolen.c @@ -10,6 +10,7 @@ #include <drm/drm_mm.h> #include <drm/i915_drm.h> +#include "gem/i915_gem_lmem.h" #include "gem/i915_gem_region.h" #include "i915_drv.h" #include "i915_gem_stolen.h" @@ -121,6 +122,14 @@ static int i915_adjust_stolen(struct drm_i915_private *i915, } } + /* + * With device local memory, we don't need to check the address range, + * this is device memory physical address, could overlap with system + * memory. + */ + if (HAS_LMEM(i915)) + return 0;
The grammar in the comment is a bit hard to parse for me, but more importantly, this is now not on the device stolen path, right?
[Comes back later, hm no, still called okay at least there is a comment now explaining which are the relevant bits.]
/* * Verify that nothing else uses this physical address. Stolen * memory should be reserved by the BIOS and hidden from the @@ -374,8 +383,9 @@ static void icl_get_stolen_reserved(struct drm_i915_private *i915, } } -static int i915_gem_init_stolen(struct drm_i915_private *i915) +static int i915_gem_init_stolen(struct intel_memory_region *mem) { + struct drm_i915_private *i915 = mem->i915; struct intel_uncore *uncore = &i915->uncore; resource_size_t reserved_base, stolen_top; resource_size_t reserved_total, reserved_size; @@ -396,10 +406,10 @@ static int i915_gem_init_stolen(struct drm_i915_private *i915) return 0; } - if (resource_size(&intel_graphics_stolen_res) == 0) + if (resource_size(&mem->region) == 0) return 0; - i915->dsm = intel_graphics_stolen_res; + i915->dsm = mem->region; if (i915_adjust_stolen(i915, &i915->dsm)) return 0; @@ -688,39 +698,130 @@ struct drm_i915_gem_object * i915_gem_object_create_stolen(struct drm_i915_private *i915, resource_size_t size) { - return i915_gem_object_create_region(i915->mm.regions[INTEL_REGION_STOLEN_SMEM], + return i915_gem_object_create_region(i915->mm.stolen_region, size, I915_BO_ALLOC_CONTIGUOUS); } -static int init_stolen(struct intel_memory_region *mem) +static int init_stolen_smem(struct intel_memory_region *mem) { - intel_memory_region_set_name(mem, "stolen");
/* * Initialise stolen early so that we may reserve preallocated * objects for the BIOS to KMS transition. */ - return i915_gem_init_stolen(mem->i915); + return i915_gem_init_stolen(mem); +}
+static void release_stolen_smem(struct intel_memory_region *mem) +{ + i915_gem_cleanup_stolen(mem->i915); +}
+static const struct intel_memory_region_ops i915_region_stolen_smem_ops = { + .init = init_stolen_smem, + .release = release_stolen_smem, + .init_object = _i915_gem_object_stolen_init, +};
+static int init_stolen_lmem(struct intel_memory_region *mem) +{ + int err;
+ if (GEM_WARN_ON(resource_size(&mem->region) == 0)) + return -ENODEV;
+ if (!io_mapping_init_wc(&mem->iomap, + mem->io_start, + resource_size(&mem->region))) + return -EIO;
+ /* + * For stolen lmem we mostly just care about populating the dsm related + * bits and setting up the drm_mm allocator for the range. + */ + err = i915_gem_init_stolen(mem);
Ideally we would be able to split this into two so there would be no further smem/lmem stolen forking inside it. That way we would also avoid the "mostly" and reach total clarity but okay, can leave for later.
I'll add a TODO comment :)
+ if (err) + goto err_fini;
+ return 0;
+err_fini: + io_mapping_fini(&mem->iomap); + return err; } -static void release_stolen(struct intel_memory_region *mem) +static void release_stolen_lmem(struct intel_memory_region *mem) { + io_mapping_fini(&mem->iomap); i915_gem_cleanup_stolen(mem->i915); } -static const struct intel_memory_region_ops i915_region_stolen_ops = { - .init = init_stolen, - .release = release_stolen, +static const struct intel_memory_region_ops i915_region_stolen_lmem_ops = { + .init = init_stolen_lmem, + .release = release_stolen_lmem, .init_object = _i915_gem_object_stolen_init, }; +static struct intel_memory_region * +setup_lmem_stolen(struct drm_i915_private *i915) +{ + struct intel_uncore *uncore = &i915->uncore; + struct pci_dev *pdev = i915->drm.pdev; + struct intel_memory_region *mem; + resource_size_t io_start; + resource_size_t lmem_size; + u64 lmem_base;
+ if (!IS_DGFX(i915)) + return ERR_PTR(-ENODEV);
Is this check needed? Looks like the caller will only call this based on HAS_REGION. GEM_DEBUG_WARN_ON(!IS_DGFX())?
+ lmem_base = intel_uncore_read64(uncore, GEN12_DSMBASE); + if (GEM_WARN_ON(lmem_base >= pci_resource_len(pdev, 2))) + return ERR_PTR(-ENODEV);
+ lmem_size = pci_resource_len(pdev, 2) - lmem_base; + io_start = pci_resource_start(pdev, 2) + lmem_base;
+ mem = intel_memory_region_create(i915, lmem_base, lmem_size, + I915_GTT_PAGE_SIZE_4K, io_start, + &i915_region_stolen_lmem_ops); + if (IS_ERR(mem)) + return mem;
+ drm_dbg(&i915->drm, "Stolen Local memory IO start: %pa\n", + &mem->io_start);
Printouts I'd prefer if they were done by the common code which calls region->init(). Afterwards it could generically print all the region data with common formatting and using the set region name. Optional, later, is fine.
Yeah, having a common helper to print everything interesting in intel_memory_region might be quite nice. I'll add a TODO.
+ intel_memory_region_set_name(mem, "stolen-local");
Should the name just be passed in to intel_memory_region_create or there is a good reason for it to be a follow up step?
I don't see a good reason, so yeah it looks like we can just pass it along. I don't have a strong opinion here.
+ return mem; +}
+static struct intel_memory_region* +setup_smem_stolen(struct drm_i915_private *i915) +{ + struct intel_memory_region *mem;
+ mem = intel_memory_region_create(i915, + intel_graphics_stolen_res.start, + resource_size(&intel_graphics_stolen_res), + PAGE_SIZE, 0, + &i915_region_stolen_smem_ops); + if (IS_ERR(mem)) + return mem;
+ intel_memory_region_set_name(mem, "stolen-system");
+ return mem; +}
struct intel_memory_region *i915_gem_stolen_setup(struct drm_i915_private *i915) { - return intel_memory_region_create(i915, - intel_graphics_stolen_res.start, - resource_size(&intel_graphics_stolen_res), - PAGE_SIZE, 0, - &i915_region_stolen_ops); + struct intel_memory_region *mem;
+ mem = setup_lmem_stolen(i915); + if (mem == ERR_PTR(-ENODEV)) + mem = setup_smem_stolen(i915);
This helper is possibly not needed any more since the caller is a switch statement with a fallthrough. So eliminate the falltrough and call the correct setup directly from there? There is the i915->mm.stolen assignment to be duplicated in that case so up to you.
Yes, let's go with that.
+ return mem; } struct drm_i915_gem_object * @@ -728,7 +829,7 @@ i915_gem_object_create_stolen_for_preallocated(struct drm_i915_private *i915, resource_size_t stolen_offset, resource_size_t size) { - struct intel_memory_region *mem = i915->mm.regions[INTEL_REGION_STOLEN_SMEM]; + struct intel_memory_region *mem = i915->mm.stolen_region; struct drm_i915_gem_object *obj; struct drm_mm_node *stolen; int ret; diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index e20294e9227a..0b44333eb703 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -514,6 +514,13 @@ struct intel_l3_parity { }; struct i915_gem_mm { + /* + * Shortcut for the stolen region. This points to either + * INTEL_REGION_STOLEN_SMEM for integrated platforms, or + * INTEL_REGION_STOLEN_LMEM for discrete, or NULL if the device doesn't + * support stolen. + */ + struct intel_memory_region *stolen_region; /** Memory allocator for GTT stolen memory */ struct drm_mm stolen; /** Protects the usage of the GTT stolen memory allocator. This is diff --git a/drivers/gpu/drm/i915/i915_pci.c b/drivers/gpu/drm/i915/i915_pci.c index 44e7b94db63d..d4673e43a46d 100644 --- a/drivers/gpu/drm/i915/i915_pci.c +++ b/drivers/gpu/drm/i915/i915_pci.c @@ -908,7 +908,7 @@ static const struct intel_device_info rkl_info = { }; #define DGFX_FEATURES \ - .memory_regions = REGION_SMEM | REGION_LMEM, \ + .memory_regions = REGION_SMEM | REGION_LMEM | REGION_STOLEN_LMEM, \ .has_master_unit_irq = 1, \ .has_llc = 0, \ .has_snoop = 1, \ diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h index f80d656331f4..ea20058bc13f 100644 --- a/drivers/gpu/drm/i915/i915_reg.h +++ b/drivers/gpu/drm/i915/i915_reg.h @@ -12191,6 +12191,7 @@ enum skl_power_gate { #define GEN12_GLOBAL_MOCS(i) _MMIO(0x4000 + (i) * 4) /* Global MOCS regs */ #define GEN12_GSMBASE _MMIO(0x108100) +#define GEN12_DSMBASE _MMIO(0x1080C0) /* gamt regs */ #define GEN8_L3_LRA_1_GPGPU _MMIO(0x4dd4) diff --git a/drivers/gpu/drm/i915/intel_memory_region.c b/drivers/gpu/drm/i915/intel_memory_region.c index bf837b6bb185..9941a4a07fde 100644 --- a/drivers/gpu/drm/i915/intel_memory_region.c +++ b/drivers/gpu/drm/i915/intel_memory_region.c @@ -22,6 +22,10 @@ static const struct { .class = INTEL_MEMORY_STOLEN_SYSTEM, .instance = 0, }, + [INTEL_REGION_STOLEN_LMEM] = { + .class = INTEL_MEMORY_STOLEN_LOCAL, + .instance = 0, + }, }; struct intel_memory_region * @@ -278,8 +282,12 @@ int intel_memory_regions_hw_probe(struct drm_i915_private *i915) case INTEL_MEMORY_SYSTEM: mem = i915_gem_shmem_setup(i915); break; + case INTEL_MEMORY_STOLEN_LOCAL: + fallthrough; case INTEL_MEMORY_STOLEN_SYSTEM: mem = i915_gem_stolen_setup(i915); + if (!IS_ERR(mem)) + i915->mm.stolen_region = mem; break; default: continue; diff --git a/drivers/gpu/drm/i915/intel_memory_region.h b/drivers/gpu/drm/i915/intel_memory_region.h index edd49067c8ca..4c8ec15af55f 100644 --- a/drivers/gpu/drm/i915/intel_memory_region.h +++ b/drivers/gpu/drm/i915/intel_memory_region.h @@ -26,18 +26,21 @@ enum intel_memory_type { INTEL_MEMORY_SYSTEM = 0, INTEL_MEMORY_LOCAL, INTEL_MEMORY_STOLEN_SYSTEM, + INTEL_MEMORY_STOLEN_LOCAL, }; enum intel_region_id { INTEL_REGION_SMEM = 0, INTEL_REGION_LMEM, INTEL_REGION_STOLEN_SMEM, + INTEL_REGION_STOLEN_LMEM, INTEL_REGION_UNKNOWN, /* Should be last */ }; #define REGION_SMEM BIT(INTEL_REGION_SMEM) #define REGION_LMEM BIT(INTEL_REGION_LMEM) #define REGION_STOLEN_SMEM BIT(INTEL_REGION_STOLEN_SMEM) +#define REGION_STOLEN_LMEM BIT(INTEL_REGION_STOLEN_LMEM) #define I915_ALLOC_MIN_PAGE_SIZE BIT(0) #define I915_ALLOC_CONTIGUOUS BIT(1) @@ -82,7 +85,7 @@ struct intel_memory_region { u16 type; u16 instance; enum intel_region_id id; - char name[8]; + char name[16]; struct list_head reserved;
Regards,
Tvrtko