[PATCH v9 08/12] drm/i915/nvm: add nvm device for discrete graphics

[Alexander Usyskin <alexander.usyskin@intel.com>]

Enable access to internal non-volatile memory on
DGFX devices via a child device.
The nvm child device is exposed via auxiliary bus.

CC: Lucas De Marchi <lucas.demarchi@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Acked-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
Co-developed-by: Tomas Winkler <tomasw@gmail.com>
Signed-off-by: Tomas Winkler <tomasw@gmail.com>
Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
---
 drivers/gpu/drm/i915/Makefile      |  4 ++
 drivers/gpu/drm/i915/i915_driver.c |  6 ++
 drivers/gpu/drm/i915/i915_drv.h    |  3 +
 drivers/gpu/drm/i915/i915_reg.h    |  1 +
 drivers/gpu/drm/i915/intel_nvm.c   | 92 ++++++++++++++++++++++++++++++
 drivers/gpu/drm/i915/intel_nvm.h   | 15 +++++
 6 files changed, 121 insertions(+)
 create mode 100644 drivers/gpu/drm/i915/intel_nvm.c
 create mode 100644 drivers/gpu/drm/i915/intel_nvm.h

diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
index 13d4a16f7d33..d9bb89cce0c9 100644
--- a/drivers/gpu/drm/i915/Makefile
+++ b/drivers/gpu/drm/i915/Makefile
@@ -212,6 +212,10 @@ i915-y += \
 i915-y += \
 	gt/intel_gsc.o
 
+# graphics nvm device (DGFX) support
+i915-y += \
+	intel_nvm.o
+
 # graphics hardware monitoring (HWMON) support
 i915-$(CONFIG_HWMON) += \
 	i915_hwmon.o
diff --git a/drivers/gpu/drm/i915/i915_driver.c b/drivers/gpu/drm/i915/i915_driver.c
index 97ff9855b5de..263ca12b96ae 100644
--- a/drivers/gpu/drm/i915/i915_driver.c
+++ b/drivers/gpu/drm/i915/i915_driver.c
@@ -83,6 +83,8 @@
 #include "soc/intel_dram.h"
 #include "soc/intel_gmch.h"
 
+#include "intel_nvm.h"
+
 #include "i915_debugfs.h"
 #include "i915_driver.h"
 #include "i915_drm_client.h"
@@ -648,6 +650,8 @@ static int i915_driver_register(struct drm_i915_private *dev_priv)
 	/* Depends on sysfs having been initialized */
 	i915_perf_register(dev_priv);
 
+	intel_nvm_init(dev_priv);
+
 	for_each_gt(gt, dev_priv, i)
 		intel_gt_driver_register(gt);
 
@@ -690,6 +694,8 @@ static void i915_driver_unregister(struct drm_i915_private *dev_priv)
 
 	i915_hwmon_unregister(dev_priv);
 
+	intel_nvm_fini(dev_priv);
+
 	i915_perf_unregister(dev_priv);
 	i915_pmu_unregister(dev_priv);
 
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index c0eec8fe5cad..bb879dc9764b 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -65,6 +65,7 @@
 struct drm_i915_clock_gating_funcs;
 struct vlv_s0ix_state;
 struct intel_pxp;
+struct intel_dg_nvm_dev;
 
 #define GEM_QUIRK_PIN_SWIZZLED_PAGES	BIT(0)
 
@@ -311,6 +312,8 @@ struct drm_i915_private {
 
 	struct i915_perf perf;
 
+	struct intel_dg_nvm_dev *nvm;
+
 	struct i915_hwmon *hwmon;
 
 	struct intel_gt *gt[I915_MAX_GT];
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 88c46a7c948f..68ded276c844 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -321,6 +321,7 @@
 #define DG2_GSC_HECI2_BASE	0x00374000
 #define MTL_GSC_HECI1_BASE	0x00116000
 #define MTL_GSC_HECI2_BASE	0x00117000
+#define GEN12_GUNIT_NVM_BASE	0x00102040
 
 #define HECI_H_CSR(base)	_MMIO((base) + 0x4)
 #define   HECI_H_CSR_IE		REG_BIT(0)
diff --git a/drivers/gpu/drm/i915/intel_nvm.c b/drivers/gpu/drm/i915/intel_nvm.c
new file mode 100644
index 000000000000..75d3ebe669ff
--- /dev/null
+++ b/drivers/gpu/drm/i915/intel_nvm.c
@@ -0,0 +1,92 @@
+// SPDX-License-Identifier: MIT
+/*
+ * Copyright(c) 2019-2024, Intel Corporation. All rights reserved.
+ */
+
+#include <linux/intel_dg_nvm_aux.h>
+#include <linux/irq.h>
+#include "i915_reg.h"
+#include "i915_drv.h"
+#include "intel_nvm.h"
+
+#define GEN12_GUNIT_NVM_SIZE 0x80
+
+static const struct intel_dg_nvm_region regions[INTEL_DG_NVM_REGIONS] = {
+	[0] = { .name = "DESCRIPTOR", },
+	[2] = { .name = "GSC", },
+	[11] = { .name = "OptionROM", },
+	[12] = { .name = "DAM", },
+};
+
+static void i915_nvm_release_dev(struct device *dev)
+{
+}
+
+void intel_nvm_init(struct drm_i915_private *i915)
+{
+	struct pci_dev *pdev = to_pci_dev(i915->drm.dev);
+	struct intel_dg_nvm_dev *nvm;
+	struct auxiliary_device *aux_dev;
+	int ret;
+
+	/* Only the DGFX devices have internal NVM */
+	if (!IS_DGFX(i915))
+		return;
+
+	/* Nvm pointer should be NULL here */
+	if (WARN_ON(i915->nvm))
+		return;
+
+	i915->nvm = kzalloc(sizeof(*nvm), GFP_KERNEL);
+	if (!i915->nvm)
+		return;
+
+	nvm = i915->nvm;
+
+	nvm->writeable_override = true;
+	nvm->bar.parent = &pdev->resource[0];
+	nvm->bar.start = GEN12_GUNIT_NVM_BASE + pdev->resource[0].start;
+	nvm->bar.end = nvm->bar.start + GEN12_GUNIT_NVM_SIZE - 1;
+	nvm->bar.flags = IORESOURCE_MEM;
+	nvm->bar.desc = IORES_DESC_NONE;
+	nvm->regions = regions;
+
+	aux_dev = &nvm->aux_dev;
+
+	aux_dev->name = "nvm";
+	aux_dev->id = (pci_domain_nr(pdev->bus) << 16) |
+		       PCI_DEVID(pdev->bus->number, pdev->devfn);
+	aux_dev->dev.parent = &pdev->dev;
+	aux_dev->dev.release = i915_nvm_release_dev;
+
+	ret = auxiliary_device_init(aux_dev);
+	if (ret) {
+		drm_err(&i915->drm, "i915-nvm aux init failed %d\n", ret);
+		return;
+	}
+
+	ret = auxiliary_device_add(aux_dev);
+	if (ret) {
+		drm_err(&i915->drm, "i915-nvm aux add failed %d\n", ret);
+		auxiliary_device_uninit(aux_dev);
+		return;
+	}
+}
+
+void intel_nvm_fini(struct drm_i915_private *i915)
+{
+	struct intel_dg_nvm_dev *nvm = i915->nvm;
+
+	/* Only the DGFX devices have internal NVM */
+	if (!IS_DGFX(i915))
+		return;
+
+	/* Nvm pointer should not be NULL here */
+	if (WARN_ON(!nvm))
+		return;
+
+	auxiliary_device_delete(&nvm->aux_dev);
+	auxiliary_device_uninit(&nvm->aux_dev);
+	kfree(nvm);
+	i915->nvm = NULL;
+}
diff --git a/drivers/gpu/drm/i915/intel_nvm.h b/drivers/gpu/drm/i915/intel_nvm.h
new file mode 100644
index 000000000000..7bc3d1114a3f
--- /dev/null
+++ b/drivers/gpu/drm/i915/intel_nvm.h
@@ -0,0 +1,15 @@
+/* SPDX-License-Identifier: MIT */
+/*
+ * Copyright(c) 2019-2024 Intel Corporation. All rights reserved.
+ */
+
+#ifndef __INTEL_NVM_H__
+#define __INTEL_NVM_H__
+
+struct drm_i915_private;
+
+void intel_nvm_init(struct drm_i915_private *i915);
+
+void intel_nvm_fini(struct drm_i915_private *i915);
+
+#endif /* __INTEL_NVM_H__ */
-- 
2.43.0


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