[Intel-gfx] [PATCH 03/11] drm/i915: Restructure probe to handle multi-tile platforms
Matt Roper
matthew.d.roper at intel.com
Fri Oct 8 21:56:27 UTC 2021
On a multi-tile platform, each tile has its own registers + GGTT space,
and BAR 0 is extended to cover all of them. Upcoming patches will start
exposing the tiles as multiple GTs within a single PCI device. In
preparation for supporting such setups, restructure the driver's probe
code a bit.
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.
Original-author: Abdiel Janulgue
Cc: Daniele Ceraolo Spurio <daniele.ceraolospurio at intel.com>
Cc: Matthew Auld <matthew.auld at intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen at linux.intel.com>
Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio at intel.com>
Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
Signed-off-by: Matt Roper <matthew.d.roper at intel.com>
---
drivers/gpu/drm/i915/gt/intel_gt.c | 45 ++++++++++++++++++++++++
drivers/gpu/drm/i915/gt/intel_gt.h | 3 ++
drivers/gpu/drm/i915/gt/intel_gt_pm.c | 9 ++++-
drivers/gpu/drm/i915/gt/intel_gt_types.h | 5 +++
drivers/gpu/drm/i915/i915_drv.c | 20 +++++------
drivers/gpu/drm/i915/intel_uncore.c | 12 +++----
drivers/gpu/drm/i915/intel_uncore.h | 3 +-
7 files changed, 76 insertions(+), 21 deletions(-)
diff --git a/drivers/gpu/drm/i915/gt/intel_gt.c b/drivers/gpu/drm/i915/gt/intel_gt.c
index 1cb1948ac959..f4bea1f1de77 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt.c
+++ b/drivers/gpu/drm/i915/gt/intel_gt.c
@@ -900,6 +900,51 @@ u32 intel_gt_read_register_fw(struct intel_gt *gt, i915_reg_t reg)
return intel_uncore_read_fw(gt->uncore, reg);
}
+static int
+tile_setup(struct intel_gt *gt, unsigned int id, phys_addr_t phys_addr)
+{
+ int ret;
+
+ intel_uncore_init_early(gt->uncore, gt->i915);
+
+ ret = intel_uncore_setup_mmio(gt->uncore, phys_addr);
+ if (ret)
+ return ret;
+
+ gt->phys_addr = phys_addr;
+
+ return 0;
+}
+
+static void tile_cleanup(struct intel_gt *gt)
+{
+ intel_uncore_cleanup_mmio(gt->uncore);
+}
+
+int intel_probe_gts(struct drm_i915_private *i915)
+{
+ struct pci_dev *pdev = to_pci_dev(i915->drm.dev);
+ 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 */
+ ret = tile_setup(&i915->gt, 0, phys_addr);
+ if (ret)
+ return ret;
+
+ /* TODO: add more tiles */
+ return 0;
+}
+
+void intel_gts_release(struct drm_i915_private *i915)
+{
+ tile_cleanup(&i915->gt);
+}
+
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 74e771871a9b..f4f35a70cbe4 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt.h
+++ b/drivers/gpu/drm/i915/gt/intel_gt.h
@@ -85,6 +85,9 @@ 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_probe_gts(struct drm_i915_private *i915);
+void intel_gts_release(struct drm_i915_private *i915);
+
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 524eaf678790..76f498edb0d5 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt_pm.c
+++ b/drivers/gpu/drm/i915/gt/intel_gt_pm.c
@@ -126,7 +126,14 @@ static const struct intel_wakeref_ops wf_ops = {
void intel_gt_pm_init_early(struct intel_gt *gt)
{
- intel_wakeref_init(>->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(>->wakeref, >->i915->runtime_pm, &wf_ops);
seqcount_mutex_init(>->stats.lock, >->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 14216cc471b1..66143316d92e 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt_types.h
+++ b/drivers/gpu/drm/i915/gt/intel_gt_types.h
@@ -180,6 +180,11 @@ 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 {
intel_engine_mask_t engine_mask;
diff --git a/drivers/gpu/drm/i915/i915_drv.c b/drivers/gpu/drm/i915/i915_drv.c
index 7f96d26c012a..51234fd1349b 100644
--- a/drivers/gpu/drm/i915/i915_drv.c
+++ b/drivers/gpu/drm/i915/i915_drv.c
@@ -312,8 +312,8 @@ static int i915_driver_early_probe(struct drm_i915_private *dev_priv)
intel_device_info_subplatform_init(dev_priv);
intel_step_init(dev_priv);
+ /* All tiles share a single mmio_debug */
intel_uncore_mmio_debug_init_early(&dev_priv->mmio_debug);
- intel_uncore_init_early(&dev_priv->uncore, dev_priv);
spin_lock_init(&dev_priv->irq_lock);
spin_lock_init(&dev_priv->gpu_error.lock);
@@ -415,13 +415,9 @@ 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);
@@ -439,9 +435,6 @@ 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;
@@ -455,7 +448,6 @@ 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);
}
@@ -844,10 +836,14 @@ 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_probe_gts(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;
@@ -904,6 +900,8 @@ 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_gts_release(i915);
out_runtime_pm_put:
enable_rpm_wakeref_asserts(&i915->runtime_pm);
i915_driver_late_release(i915);
diff --git a/drivers/gpu/drm/i915/intel_uncore.c b/drivers/gpu/drm/i915/intel_uncore.c
index a308e86c9d9f..8a0a0676d67a 100644
--- a/drivers/gpu/drm/i915/intel_uncore.c
+++ b/drivers/gpu/drm/i915/intel_uncore.c
@@ -2020,14 +2020,11 @@ 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
@@ -2044,7 +2041,7 @@ 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;
@@ -2055,9 +2052,8 @@ 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 d1d17b04e29f..83a455aa8374 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.h"
@@ -218,7 +219,7 @@ void
intel_uncore_mmio_debug_init_early(struct intel_uncore_mmio_debug *mmio_debug);
void intel_uncore_init_early(struct intel_uncore *uncore,
struct drm_i915_private *i915);
-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);
--
2.33.0
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