[Intel-gfx] [PATCH v5 2/7] drm/i915: Prepare for multiple GTs

Andi Shyti
2022-02-17T14:43:55Z

From: Tvrtko Ursulin <tvrtko.ursulin@intel.com>

On a multi-tile platform, each tile has its own registers + GGTT
space, and BAR 0 is extended to cover all of them.

Up to four GTs are supported in i915->gt[], with slot zero
shadowing the existing i915->gt0 to enable source compatibility
with legacy driver paths. A for_each_gt macro is added to iterate
over the GTs and will be used by upcoming patches that convert
various parts of the driver to be multi-gt aware.

Only the primary/root tile is initialized for now; the other
tiles will be detected and plugged in by future patches once the
necessary infrastructure is in place to handle them.

Signed-off-by: Abdiel Janulgue <abdiel.janulgue@gmail.com>
Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Andi Shyti <andi.shyti@linux.intel.com>
Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Matthew Auld <matthew.auld@intel.com>
Reviewed-by: Matt Roper <matthew.d.roper@intel.com>
---
drivers/gpu/drm/i915/gt/intel_gt.c | 135 ++++++++++++++++--
drivers/gpu/drm/i915/gt/intel_gt.h | 16 ++-
drivers/gpu/drm/i915/gt/intel_gt_pm.c | 9 +-
drivers/gpu/drm/i915/gt/intel_gt_types.h | 7 +
drivers/gpu/drm/i915/i915_driver.c | 29 ++--
drivers/gpu/drm/i915/i915_drv.h | 6 +
drivers/gpu/drm/i915/intel_memory_region.h | 3 +
drivers/gpu/drm/i915/intel_uncore.c | 12 +-
drivers/gpu/drm/i915/intel_uncore.h | 3 +-
.../gpu/drm/i915/selftests/mock_gem_device.c | 7 +-
10 files changed, 182 insertions(+), 45 deletions(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_gt.c b/drivers/gpu/drm/i915/gt/intel_gt.c
index db171e85f4df..8c64b81e9ec9 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt.c
+++ b/drivers/gpu/drm/i915/gt/intel_gt.c
@@ -29,7 +29,7 @@
#include "intel_uncore.h"
#include "shmem_utils.h"

-void __intel_gt_init_early(struct intel_gt *gt, struct drm_i915_private *i915)
+static void __intel_gt_init_early(struct intel_gt *gt)
{
spin_lock_init(&gt->irq_lock);

@@ -51,19 +51,29 @@ void __intel_gt_init_early(struct intel_gt *gt, struct drm_i915_private *i915)
intel_rps_init_early(&gt->rps);
}

-void intel_gt_init_early(struct intel_gt *gt, struct drm_i915_private *i915)
+/* Preliminary initialization of Tile 0 */
+void intel_root_gt_init_early(struct drm_i915_private *i915)
{
+ struct intel_gt *gt = to_gt(i915);
+
gt->i915 = i915;
gt->uncore = &i915->uncore;
+
+ __intel_gt_init_early(gt);
}

-int intel_gt_probe_lmem(struct intel_gt *gt)
+static int intel_gt_probe_lmem(struct intel_gt *gt)
{
struct drm_i915_private *i915 = gt->i915;
+ unsigned int instance = gt->info.id;
struct intel_memory_region *mem;
int id;
int err;

+ id = INTEL_REGION_LMEM_0 + instance;
+ if (drm_WARN_ON(&i915->drm, id >= INTEL_REGION_STOLEN_SMEM))
+ return -ENODEV;
+
mem = intel_gt_setup_lmem(gt);
if (mem == ERR_PTR(-ENODEV))
mem = intel_gt_setup_fake_lmem(gt);
@@ -78,9 +88,8 @@ int intel_gt_probe_lmem(struct intel_gt *gt)
return err;
}

- id = INTEL_REGION_LMEM_0;
-
mem->id = id;
+ mem->instance = instance;

intel_memory_region_set_name(mem, "local%u", mem->instance);

@@ -795,16 +804,21 @@ void intel_gt_driver_release(struct intel_gt *gt)
intel_gt_fini_buffer_pool(gt);
}

-void intel_gt_driver_late_release(struct intel_gt *gt)
+void intel_gt_driver_late_release(struct drm_i915_private *i915)
{
+ struct intel_gt *gt;
+ unsigned int id;
+
/* We need to wait for inflight RCU frees to release their grip */
rcu_barrier();

- intel_uc_driver_late_release(&gt->uc);
- intel_gt_fini_requests(gt);
- intel_gt_fini_reset(gt);
- intel_gt_fini_timelines(gt);
- intel_engines_free(gt);
+ for_each_gt(gt, i915, id) {
+ intel_uc_driver_late_release(&gt->uc);
+ intel_gt_fini_requests(gt);
+ intel_gt_fini_reset(gt);
+ intel_gt_fini_timelines(gt);
+ intel_engines_free(gt);
+ }
}

/**
@@ -913,6 +927,105 @@ u32 intel_gt_read_register_fw(struct intel_gt *gt, i915_reg_t reg)
return intel_uncore_read_fw(gt->uncore, reg);
}

+static int intel_gt_tile_setup(struct intel_gt *gt, phys_addr_t phys_addr)
+{
+ unsigned int id = gt->info.id;
+ int ret;
+
+ if (id) {
+ struct intel_uncore_mmio_debug *mmio_debug;
+ struct intel_uncore *uncore;
+
+ uncore = kzalloc(sizeof(*uncore), GFP_KERNEL);
+ if (!gt->uncore)
+ return -ENOMEM;
+
+ mmio_debug = kzalloc(sizeof(*mmio_debug), GFP_KERNEL);
+ if (!mmio_debug) {
+ kfree(uncore);
+ return -ENOMEM;
+ }
+
+ gt->uncore = uncore;
+ gt->uncore->debug = mmio_debug;
+
+ __intel_gt_init_early(gt);
+ }
+
+ intel_uncore_init_early(gt->uncore, gt);
+
+ ret = intel_uncore_setup_mmio(gt->uncore, phys_addr);
+ if (ret)
+ return ret;
+
+ gt->phys_addr = phys_addr;
+
+ return 0;
+}
+
+static void
+intel_gt_tile_cleanup(struct intel_gt *gt)
+{
+ intel_uncore_cleanup_mmio(gt->uncore);
+
+ if (gt->info.id) {
+ kfree(gt->uncore);
+ kfree(gt);
+ }
+}
+
+int intel_gt_probe_all(struct drm_i915_private *i915)
+{
+ struct pci_dev *pdev = to_pci_dev(i915->drm.dev);
+ struct intel_gt *gt = &i915->gt0;
+ phys_addr_t phys_addr;
+ unsigned int mmio_bar;
+ int ret;
+
+ mmio_bar = GRAPHICS_VER(i915) == 2 ? 1 : 0;
+ phys_addr = pci_resource_start(pdev, mmio_bar);
+
+ /*
+ * We always have at least one primary GT on any device
+ * and it has been already initialized early during probe
+ * in i915_driver_probe()
+ */
+ ret = intel_gt_tile_setup(gt, phys_addr);
+ if (ret)
+ return ret;
+
+ i915->gt[0] = gt;
+
+ /* TODO: add more tiles */
+ return 0;
+}
+
+int intel_gt_tiles_init(struct drm_i915_private *i915)
+{
+ struct intel_gt *gt;
+ unsigned int id;
+ int ret;
+
+ for_each_gt(gt, i915, id) {
+ ret = intel_gt_probe_lmem(gt);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
+void intel_gt_release_all(struct drm_i915_private *i915)
+{
+ struct intel_gt *gt;
+ unsigned int id;
+
+ for_each_gt(gt, i915, id) {
+ intel_gt_tile_cleanup(gt);
+ i915->gt[id] = NULL;
+ }
+}
+
void intel_gt_info_print(const struct intel_gt_info *info,
struct drm_printer *p)
{
diff --git a/drivers/gpu/drm/i915/gt/intel_gt.h b/drivers/gpu/drm/i915/gt/intel_gt.h
index 2dad46c3eff2..915d6192079b 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt.h
+++ b/drivers/gpu/drm/i915/gt/intel_gt.h
@@ -34,10 +34,8 @@ static inline struct intel_gt *huc_to_gt(struct intel_huc *huc)
return container_of(huc, struct intel_gt, uc.huc);
}

-void intel_gt_init_early(struct intel_gt *gt, struct drm_i915_private *i915);
-void __intel_gt_init_early(struct intel_gt *gt, struct drm_i915_private *i915);
+void intel_root_gt_init_early(struct drm_i915_private *i915);
int intel_gt_assign_ggtt(struct intel_gt *gt);
-int intel_gt_probe_lmem(struct intel_gt *gt);
int intel_gt_init_mmio(struct intel_gt *gt);
int __must_check intel_gt_init_hw(struct intel_gt *gt);
int intel_gt_init(struct intel_gt *gt);
@@ -47,7 +45,7 @@ void intel_gt_driver_unregister(struct intel_gt *gt);
void intel_gt_driver_remove(struct intel_gt *gt);
void intel_gt_driver_release(struct intel_gt *gt);

-void intel_gt_driver_late_release(struct intel_gt *gt);
+void intel_gt_driver_late_release(struct drm_i915_private *i915);

int intel_gt_wait_for_idle(struct intel_gt *gt, long timeout);

@@ -86,6 +84,16 @@ static inline bool intel_gt_needs_read_steering(struct intel_gt *gt,

u32 intel_gt_read_register_fw(struct intel_gt *gt, i915_reg_t reg);

+int intel_gt_probe_all(struct drm_i915_private *i915);
+int intel_gt_tiles_init(struct drm_i915_private *i915);
+void intel_gt_release_all(struct drm_i915_private *i915);
+
+#define for_each_gt(gt__, i915__, id__) \
+ for ((id__) = 0; \
+ (id__) < I915_MAX_GT; \
+ (id__)++) \
+ for_each_if(((gt__) = (i915__)->gt[(id__)]))
+
void intel_gt_info_print(const struct intel_gt_info *info,
struct drm_printer *p);

diff --git a/drivers/gpu/drm/i915/gt/intel_gt_pm.c b/drivers/gpu/drm/i915/gt/intel_gt_pm.c
index c0fa41e4c803..e66479d33bc3 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt_pm.c
+++ b/drivers/gpu/drm/i915/gt/intel_gt_pm.c
@@ -128,7 +128,14 @@ static const struct intel_wakeref_ops wf_ops = {

void intel_gt_pm_init_early(struct intel_gt *gt)
{
- intel_wakeref_init(&gt->wakeref, gt->uncore->rpm, &wf_ops);
+ /*
+ * We access the runtime_pm structure via gt->i915 here rather than
+ * gt->uncore as we do elsewhere in the file because gt->uncore is not
+ * yet initialized for all tiles at this point in the driver startup.
+ * runtime_pm is per-device rather than per-tile, so this is still the
+ * correct structure.
+ */
+ intel_wakeref_init(&gt->wakeref, &gt->i915->runtime_pm, &wf_ops);
seqcount_mutex_init(&gt->stats.lock, &gt->wakeref.mutex);
}

diff --git a/drivers/gpu/drm/i915/gt/intel_gt_types.h b/drivers/gpu/drm/i915/gt/intel_gt_types.h
index f20687796490..89fad770b2d4 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt_types.h
+++ b/drivers/gpu/drm/i915/gt/intel_gt_types.h
@@ -182,7 +182,14 @@ struct intel_gt {

const struct intel_mmio_range *steering_table[NUM_STEERING_TYPES];

+ /*
+ * Base of per-tile GTTMMADR where we can derive the MMIO and the GGTT.
+ */
+ phys_addr_t phys_addr;
+
struct intel_gt_info {
+ unsigned int id;
+
intel_engine_mask_t engine_mask;

u32 l3bank_mask;
diff --git a/drivers/gpu/drm/i915/i915_driver.c b/drivers/gpu/drm/i915/i915_driver.c
index 1c67ff735f18..144f989e4fef 100644
--- a/drivers/gpu/drm/i915/i915_driver.c
+++ b/drivers/gpu/drm/i915/i915_driver.c
@@ -320,9 +320,8 @@ static int i915_driver_early_probe(struct drm_i915_private *dev_priv)
intel_device_info_subplatform_init(dev_priv);
intel_step_init(dev_priv);

- intel_gt_init_early(to_gt(dev_priv), dev_priv);
+ /* All tiles share a single mmio_debug */
intel_uncore_mmio_debug_init_early(&dev_priv->mmio_debug);
- intel_uncore_init_early(&dev_priv->uncore, to_gt(dev_priv));

spin_lock_init(&dev_priv->irq_lock);
spin_lock_init(&dev_priv->gpu_error.lock);
@@ -353,7 +352,7 @@ static int i915_driver_early_probe(struct drm_i915_private *dev_priv)

intel_wopcm_init_early(&dev_priv->wopcm);

- __intel_gt_init_early(to_gt(dev_priv), dev_priv);
+ intel_root_gt_init_early(dev_priv);

i915_gem_init_early(dev_priv);

@@ -374,7 +373,7 @@ static int i915_driver_early_probe(struct drm_i915_private *dev_priv)

err_gem:
i915_gem_cleanup_early(dev_priv);
- intel_gt_driver_late_release(to_gt(dev_priv));
+ intel_gt_driver_late_release(dev_priv);
intel_region_ttm_device_fini(dev_priv);
err_ttm:
vlv_suspend_cleanup(dev_priv);
@@ -393,7 +392,7 @@ static void i915_driver_late_release(struct drm_i915_private *dev_priv)
intel_irq_fini(dev_priv);
intel_power_domains_cleanup(dev_priv);
i915_gem_cleanup_early(dev_priv);
- intel_gt_driver_late_release(to_gt(dev_priv));
+ intel_gt_driver_late_release(dev_priv);
intel_region_ttm_device_fini(dev_priv);
vlv_suspend_cleanup(dev_priv);
i915_workqueues_cleanup(dev_priv);
@@ -424,13 +423,9 @@ static int i915_driver_mmio_probe(struct drm_i915_private *dev_priv)
if (ret < 0)
return ret;

- ret = intel_uncore_setup_mmio(&dev_priv->uncore);
- if (ret < 0)
- goto err_bridge;
-
ret = intel_uncore_init_mmio(&dev_priv->uncore);
if (ret)
- goto err_mmio;
+ return ret;

/* Try to make sure MCHBAR is enabled before poking at it */
intel_setup_mchbar(dev_priv);
@@ -448,9 +443,6 @@ static int i915_driver_mmio_probe(struct drm_i915_private *dev_priv)
err_uncore:
intel_teardown_mchbar(dev_priv);
intel_uncore_fini_mmio(&dev_priv->uncore);
-err_mmio:
- intel_uncore_cleanup_mmio(&dev_priv->uncore);
-err_bridge:
pci_dev_put(dev_priv->bridge_dev);

return ret;
@@ -464,7 +456,6 @@ static void i915_driver_mmio_release(struct drm_i915_private *dev_priv)
{
intel_teardown_mchbar(dev_priv);
intel_uncore_fini_mmio(&dev_priv->uncore);
- intel_uncore_cleanup_mmio(&dev_priv->uncore);
pci_dev_put(dev_priv->bridge_dev);
}

@@ -597,7 +588,7 @@ static int i915_driver_hw_probe(struct drm_i915_private *dev_priv)
if (ret)
goto err_ggtt;

- ret = intel_gt_probe_lmem(to_gt(dev_priv));
+ ret = intel_gt_tiles_init(dev_priv);
if (ret)
goto err_mem_regions;

@@ -862,10 +853,14 @@ int i915_driver_probe(struct pci_dev *pdev, const struct pci_device_id *ent)

intel_vgpu_detect(i915);

- ret = i915_driver_mmio_probe(i915);
+ ret = intel_gt_probe_all(i915);
if (ret < 0)
goto out_runtime_pm_put;

+ ret = i915_driver_mmio_probe(i915);
+ if (ret < 0)
+ goto out_tiles_cleanup;
+
ret = i915_driver_hw_probe(i915);
if (ret < 0)
goto out_cleanup_mmio;
@@ -922,6 +917,8 @@ int i915_driver_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
i915_ggtt_driver_late_release(i915);
out_cleanup_mmio:
i915_driver_mmio_release(i915);
+out_tiles_cleanup:
+ intel_gt_release_all(i915);
out_runtime_pm_put:
enable_rpm_wakeref_asserts(&i915->runtime_pm);
i915_driver_late_release(i915);
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 418091484e02..88a83cd81ddd 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -805,6 +805,12 @@ struct drm_i915_private {
/* Abstract the submission mechanism (legacy ringbuffer or execlists) away */
struct intel_gt gt0;

+ /*
+ * i915->gt[0] == &i915->gt0
+ */
+#define I915_MAX_GT 4
+ struct intel_gt *gt[I915_MAX_GT];
+
struct {
struct i915_gem_contexts {
spinlock_t lock; /* locks list */
diff --git a/drivers/gpu/drm/i915/intel_memory_region.h b/drivers/gpu/drm/i915/intel_memory_region.h
index 95db0a8029e2..9548335344be 100644
--- a/drivers/gpu/drm/i915/intel_memory_region.h
+++ b/drivers/gpu/drm/i915/intel_memory_region.h
@@ -30,6 +30,9 @@ enum intel_memory_type {
enum intel_region_id {
INTEL_REGION_SMEM = 0,
INTEL_REGION_LMEM_0,
+ INTEL_REGION_LMEM_1,
+ INTEL_REGION_LMEM_2,
+ INTEL_REGION_LMEM_3,
INTEL_REGION_STOLEN_SMEM,
INTEL_REGION_STOLEN_LMEM,
INTEL_REGION_UNKNOWN, /* Should be last */
diff --git a/drivers/gpu/drm/i915/intel_uncore.c b/drivers/gpu/drm/i915/intel_uncore.c
index dd8fdd5863de..75d9fa21923e 100644
--- a/drivers/gpu/drm/i915/intel_uncore.c
+++ b/drivers/gpu/drm/i915/intel_uncore.c
@@ -2039,14 +2039,11 @@ static int i915_pmic_bus_access_notifier(struct notifier_block *nb,
return NOTIFY_OK;
}

-int intel_uncore_setup_mmio(struct intel_uncore *uncore)
+int intel_uncore_setup_mmio(struct intel_uncore *uncore, phys_addr_t phys_addr)
{
struct drm_i915_private *i915 = uncore->i915;
- struct pci_dev *pdev = to_pci_dev(i915->drm.dev);
- int mmio_bar;
int mmio_size;

- mmio_bar = GRAPHICS_VER(i915) == 2 ? 1 : 0;
/*
* Before gen4, the registers and the GTT are behind different BARs.
* However, from gen4 onwards, the registers and the GTT are shared
@@ -2063,7 +2060,7 @@ int intel_uncore_setup_mmio(struct intel_uncore *uncore)
else
mmio_size = 2 * 1024 * 1024;

- uncore->regs = pci_iomap(pdev, mmio_bar, mmio_size);
+ uncore->regs = ioremap(phys_addr, mmio_size);
if (uncore->regs == NULL) {
drm_err(&i915->drm, "failed to map registers\n");
return -EIO;
@@ -2074,9 +2071,8 @@ int intel_uncore_setup_mmio(struct intel_uncore *uncore)

void intel_uncore_cleanup_mmio(struct intel_uncore *uncore)
{
- struct pci_dev *pdev = to_pci_dev(uncore->i915->drm.dev);
-
- pci_iounmap(pdev, uncore->regs);
+ if (uncore->regs)
+ iounmap(uncore->regs);
}

void intel_uncore_init_early(struct intel_uncore *uncore,
diff --git a/drivers/gpu/drm/i915/intel_uncore.h b/drivers/gpu/drm/i915/intel_uncore.h
index 6ff56d673e2b..de53c961fadb 100644
--- a/drivers/gpu/drm/i915/intel_uncore.h
+++ b/drivers/gpu/drm/i915/intel_uncore.h
@@ -29,6 +29,7 @@
#include <linux/notifier.h>
#include <linux/hrtimer.h>
#include <linux/io-64-nonatomic-lo-hi.h>
+#include <linux/types.h>

#include "i915_reg_defs.h"

@@ -219,7 +220,7 @@ void
intel_uncore_mmio_debug_init_early(struct intel_uncore_mmio_debug *mmio_debug);
void intel_uncore_init_early(struct intel_uncore *uncore,
struct intel_gt *gt);
-int intel_uncore_setup_mmio(struct intel_uncore *uncore);
+int intel_uncore_setup_mmio(struct intel_uncore *uncore, phys_addr_t phys_addr);
int intel_uncore_init_mmio(struct intel_uncore *uncore);
void intel_uncore_prune_engine_fw_domains(struct intel_uncore *uncore,
struct intel_gt *gt);
diff --git a/drivers/gpu/drm/i915/selftests/mock_gem_device.c b/drivers/gpu/drm/i915/selftests/mock_gem_device.c
index 573d9b2e1a4a..f72436c5d596 100644
--- a/drivers/gpu/drm/i915/selftests/mock_gem_device.c
+++ b/drivers/gpu/drm/i915/selftests/mock_gem_device.c
@@ -73,7 +73,7 @@ static void mock_device_release(struct drm_device *dev)
destroy_workqueue(i915->wq);

intel_region_ttm_device_fini(i915);
- intel_gt_driver_late_release(to_gt(i915));
+ intel_gt_driver_late_release(i915);
intel_memory_regions_driver_release(i915);

drm_mode_config_cleanup(&i915->drm);
@@ -180,8 +180,7 @@ struct drm_i915_private *mock_gem_device(void)
spin_lock_init(&i915->gpu_error.lock);

i915_gem_init__mm(i915);
- intel_gt_init_early(to_gt(i915), i915);
- __intel_gt_init_early(to_gt(i915), i915);
+ intel_root_gt_init_early(i915);
mock_uncore_init(&i915->uncore, i915);
atomic_inc(&to_gt(i915)->wakeref.count); /* disable; no hw support */
to_gt(i915)->awake = -ENODEV;
@@ -229,7 +228,7 @@ struct drm_i915_private *mock_gem_device(void)
err_drv:
intel_region_ttm_device_fini(i915);
err_ttm:
- intel_gt_driver_late_release(to_gt(i915));
+ intel_gt_driver_late_release(i915);
intel_memory_regions_driver_release(i915);
drm_mode_config_cleanup(&i915->drm);
mock_destroy_device(i915);
--
2.27.0