[PATCH v2 1/7] drm/amdgpu: Implement DPC recovery

[Andrey Grodzovsky <andrey.grodzovsky@amd.com>]

Add DPC handlers with basic recovery functionality.

v2: remove pci_save_state to avoid breaking suspend/resume

Signed-off-by: Andrey Grodzovsky <andrey.grodzovsky@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu.h        |   9 ++
 drivers/gpu/drm/amd/amdgpu/amdgpu_device.c | 169 ++++++++++++++++++++++++++++-
 drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c    |   9 +-
 3 files changed, 184 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu.h b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
index 49ea9fa..3399242 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu.h
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu.h
@@ -49,6 +49,8 @@
 #include <linux/rbtree.h>
 #include <linux/hashtable.h>
 #include <linux/dma-fence.h>
+#include <linux/pci.h>
+#include <linux/aer.h>
 
 #include <drm/ttm/ttm_bo_api.h>
 #include <drm/ttm/ttm_bo_driver.h>
@@ -1263,6 +1265,13 @@ static inline int amdgpu_dm_display_resume(struct amdgpu_device *adev) { return
 void amdgpu_register_gpu_instance(struct amdgpu_device *adev);
 void amdgpu_unregister_gpu_instance(struct amdgpu_device *adev);
 
+pci_ers_result_t amdgpu_pci_error_detected(struct pci_dev *pdev,
+					   pci_channel_state_t state);
+pci_ers_result_t amdgpu_pci_mmio_enabled(struct pci_dev *pdev);
+pci_ers_result_t amdgpu_pci_slot_reset(struct pci_dev *pdev);
+void amdgpu_pci_resume(struct pci_dev *pdev);
+
+
 #include "amdgpu_object.h"
 
 /* used by df_v3_6.c and amdgpu_pmu.c */
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
index 5a948ed..937f8b0 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_device.c
@@ -350,7 +350,8 @@ uint32_t amdgpu_mm_rreg(struct amdgpu_device *adev, uint32_t reg,
  *
  * Returns the 8 bit value from the offset specified.
  */
-uint8_t amdgpu_mm_rreg8(struct amdgpu_device *adev, uint32_t offset) {
+uint8_t amdgpu_mm_rreg8(struct amdgpu_device *adev, uint32_t offset)
+{
 	if (offset < adev->rmmio_size)
 		return (readb(adev->rmmio + offset));
 	BUG();
@@ -371,7 +372,8 @@ uint8_t amdgpu_mm_rreg8(struct amdgpu_device *adev, uint32_t offset) {
  *
  * Writes the value specified to the offset specified.
  */
-void amdgpu_mm_wreg8(struct amdgpu_device *adev, uint32_t offset, uint8_t value) {
+void amdgpu_mm_wreg8(struct amdgpu_device *adev, uint32_t offset, uint8_t value)
+{
 	if (offset < adev->rmmio_size)
 		writeb(value, adev->rmmio + offset);
 	else
@@ -2989,6 +2991,7 @@ static const struct attribute *amdgpu_dev_attributes[] = {
 	NULL
 };
 
+
 /**
  * amdgpu_device_init - initialize the driver
  *
@@ -3207,6 +3210,9 @@ int amdgpu_device_init(struct amdgpu_device *adev,
 		}
 	}
 
+	pci_enable_pcie_error_reporting(adev->ddev.pdev);
+
+
 	/* Post card if necessary */
 	if (amdgpu_device_need_post(adev)) {
 		if (!adev->bios) {
@@ -4701,3 +4707,162 @@ int amdgpu_device_baco_exit(struct drm_device *dev)
 
 	return 0;
 }
+
+/**
+ * amdgpu_pci_error_detected - Called when a PCI error is detected.
+ * @pdev: PCI device struct
+ * @state: PCI channel state
+ *
+ * Description: Called when a PCI error is detected.
+ *
+ * Return: PCI_ERS_RESULT_NEED_RESET or PCI_ERS_RESULT_DISCONNECT.
+ */
+pci_ers_result_t amdgpu_pci_error_detected(struct pci_dev *pdev, pci_channel_state_t state)
+{
+	struct drm_device *dev = pci_get_drvdata(pdev);
+	struct amdgpu_device *adev = drm_to_adev(dev);
+
+	DRM_INFO("PCI error: detected callback, state(%d)!!\n", state);
+
+	switch (state) {
+	case pci_channel_io_normal:
+		return PCI_ERS_RESULT_CAN_RECOVER;
+	case pci_channel_io_frozen: {
+		/* Fatal error, prepare for slot reset */
+
+		amdgpu_device_lock_adev(adev);
+		return PCI_ERS_RESULT_NEED_RESET;
+	}
+	case pci_channel_io_perm_failure:
+		/* Permanent error, prepare for device removal */
+		return PCI_ERS_RESULT_DISCONNECT;
+	}
+	return PCI_ERS_RESULT_NEED_RESET;
+}
+
+/**
+ * amdgpu_pci_mmio_enabled - Enable MMIO and dump debug registers
+ * @pdev: pointer to PCI device
+ */
+pci_ers_result_t amdgpu_pci_mmio_enabled(struct pci_dev *pdev)
+{
+
+	DRM_INFO("PCI error: mmio enabled callback!!\n");
+
+	/* TODO - dump whatever for debugging purposes */
+
+	/* This called only if amdgpu_pci_error_detected returns
+	 * PCI_ERS_RESULT_CAN_RECOVER. Read/write to the device still
+	 * works, no need to reset slot.
+	 */
+
+	return PCI_ERS_RESULT_RECOVERED;
+}
+
+/**
+ * amdgpu_pci_slot_reset - Called when PCI slot has been reset.
+ * @pdev: PCI device struct
+ *
+ * Description: This routine is called by the pci error recovery
+ * code after the PCI slot has been reset, just before we
+ * should resume normal operations.
+ */
+pci_ers_result_t amdgpu_pci_slot_reset(struct pci_dev *pdev)
+{
+	struct drm_device *dev = pci_get_drvdata(pdev);
+	struct amdgpu_device *adev = drm_to_adev(dev);
+	int r;
+	bool vram_lost;
+
+	DRM_INFO("PCI error: slot reset callback!!\n");
+
+	pci_restore_state(pdev);
+
+	r = amdgpu_device_ip_suspend(adev);
+	if (r)
+		goto out;
+
+
+	/* post card */
+	r = amdgpu_atom_asic_init(adev->mode_info.atom_context);
+	if (r)
+		goto out;
+
+	r = amdgpu_device_ip_resume_phase1(adev);
+	if (r)
+		goto out;
+
+	vram_lost = amdgpu_device_check_vram_lost(adev);
+	if (vram_lost) {
+		DRM_INFO("VRAM is lost due to GPU reset!\n");
+		amdgpu_inc_vram_lost(adev);
+	}
+
+	r = amdgpu_gtt_mgr_recover(
+		&adev->mman.bdev.man[TTM_PL_TT]);
+	if (r)
+		goto out;
+
+	r = amdgpu_device_fw_loading(adev);
+	if (r)
+		return r;
+
+	r = amdgpu_device_ip_resume_phase2(adev);
+	if (r)
+		goto out;
+
+	if (vram_lost)
+		amdgpu_device_fill_reset_magic(adev);
+
+	/*
+	 * Add this ASIC as tracked as reset was already
+	 * complete successfully.
+	 */
+	amdgpu_register_gpu_instance(adev);
+
+	r = amdgpu_device_ip_late_init(adev);
+	if (r)
+		goto out;
+
+	amdgpu_fbdev_set_suspend(adev, 0);
+
+	/* must succeed. */
+	amdgpu_ras_resume(adev);
+
+
+	amdgpu_irq_gpu_reset_resume_helper(adev);
+	r = amdgpu_ib_ring_tests(adev);
+	if (r)
+		goto out;
+
+	r = amdgpu_device_recover_vram(adev);
+
+out:
+
+	if (!r)
+		DRM_INFO("PCIe error recovery succeeded\n");
+	else {
+		DRM_ERROR("PCIe error recovery failed, err:%d", r);
+		amdgpu_device_unlock_adev(adev);
+	}
+
+	return r ? PCI_ERS_RESULT_DISCONNECT : PCI_ERS_RESULT_RECOVERED;
+}
+
+/**
+ * amdgpu_pci_resume() - resume normal ops after PCI reset
+ * @pdev: pointer to PCI device
+ *
+ * Called when the error recovery driver tells us that its
+ * OK to resume normal operation. Use completion to allow
+ * halted scsi ops to resume.
+ */
+void amdgpu_pci_resume(struct pci_dev *pdev)
+{
+	struct drm_device *dev = pci_get_drvdata(pdev);
+	struct amdgpu_device *adev = drm_to_adev(dev);
+
+	amdgpu_device_unlock_adev(adev);
+
+	DRM_INFO("PCI error: resume callback!!\n");
+}
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
index d984c6a..4bbcc70 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c
@@ -31,7 +31,6 @@
 #include <drm/drm_pciids.h>
 #include <linux/console.h>
 #include <linux/module.h>
-#include <linux/pci.h>
 #include <linux/pm_runtime.h>
 #include <linux/vga_switcheroo.h>
 #include <drm/drm_probe_helper.h>
@@ -1534,6 +1533,13 @@ static struct drm_driver kms_driver = {
 	.patchlevel = KMS_DRIVER_PATCHLEVEL,
 };
 
+static struct pci_error_handlers amdgpu_pci_err_handler = {
+	.error_detected	= amdgpu_pci_error_detected,
+	.mmio_enabled	= amdgpu_pci_mmio_enabled,
+	.slot_reset	= amdgpu_pci_slot_reset,
+	.resume		= amdgpu_pci_resume,
+};
+
 static struct pci_driver amdgpu_kms_pci_driver = {
 	.name = DRIVER_NAME,
 	.id_table = pciidlist,
@@ -1541,6 +1547,7 @@ static struct pci_driver amdgpu_kms_pci_driver = {
 	.remove = amdgpu_pci_remove,
 	.shutdown = amdgpu_pci_shutdown,
 	.driver.pm = &amdgpu_pm_ops,
+	.err_handler = &amdgpu_pci_err_handler,
 };
 
 static int __init amdgpu_init(void)
-- 
2.7.4

_______________________________________________
amd-gfx mailing list
amd-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/amd-gfx