drm/radeon: Add support for CIK GPU reset (v2)

v2: split soft reset into compute and gfx.  Still need
to make reset more fine grained, but this should be a
start.

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/radeon/cik.c

@@ -27,9 +27,13 @@
 #include <linux/module.h>
 #include "drmP.h"
 #include "radeon.h"
+#include "radeon_asic.h"
 #include "cikd.h"
 #include "atom.h"
 
+extern void evergreen_mc_stop(struct radeon_device *rdev, struct evergreen_mc_save *save);
+extern void evergreen_mc_resume(struct radeon_device *rdev, struct evergreen_mc_save *save);
+
 /*
  * Core functions
  */
@@ -1190,3 +1194,196 @@ static void cik_gpu_init(struct radeon_device *rdev)
 	udelay(50);
 }
 
+/**
+ * cik_gpu_is_lockup - check if the 3D engine is locked up
+ *
+ * @rdev: radeon_device pointer
+ * @ring: radeon_ring structure holding ring information
+ *
+ * Check if the 3D engine is locked up (CIK).
+ * Returns true if the engine is locked, false if not.
+ */
+bool cik_gpu_is_lockup(struct radeon_device *rdev, struct radeon_ring *ring)
+{
+	u32 srbm_status, srbm_status2;
+	u32 grbm_status, grbm_status2;
+	u32 grbm_status_se0, grbm_status_se1, grbm_status_se2, grbm_status_se3;
+
+	srbm_status = RREG32(SRBM_STATUS);
+	srbm_status2 = RREG32(SRBM_STATUS2);
+	grbm_status = RREG32(GRBM_STATUS);
+	grbm_status2 = RREG32(GRBM_STATUS2);
+	grbm_status_se0 = RREG32(GRBM_STATUS_SE0);
+	grbm_status_se1 = RREG32(GRBM_STATUS_SE1);
+	grbm_status_se2 = RREG32(GRBM_STATUS_SE2);
+	grbm_status_se3 = RREG32(GRBM_STATUS_SE3);
+	if (!(grbm_status & GUI_ACTIVE)) {
+		radeon_ring_lockup_update(ring);
+		return false;
+	}
+	/* force CP activities */
+	radeon_ring_force_activity(rdev, ring);
+	return radeon_ring_test_lockup(rdev, ring);
+}
+
+/**
+ * cik_gfx_gpu_soft_reset - soft reset the 3D engine and CPG
+ *
+ * @rdev: radeon_device pointer
+ *
+ * Soft reset the GFX engine and CPG blocks (CIK).
+ * XXX: deal with reseting RLC and CPF
+ * Returns 0 for success.
+ */
+static int cik_gfx_gpu_soft_reset(struct radeon_device *rdev)
+{
+	struct evergreen_mc_save save;
+	u32 grbm_reset = 0;
+
+	if (!(RREG32(GRBM_STATUS) & GUI_ACTIVE))
+		return 0;
+
+	dev_info(rdev->dev, "GPU GFX softreset \n");
+	dev_info(rdev->dev, "  GRBM_STATUS=0x%08X\n",
+		RREG32(GRBM_STATUS));
+	dev_info(rdev->dev, "  GRBM_STATUS2=0x%08X\n",
+		RREG32(GRBM_STATUS2));
+	dev_info(rdev->dev, "  GRBM_STATUS_SE0=0x%08X\n",
+		RREG32(GRBM_STATUS_SE0));
+	dev_info(rdev->dev, "  GRBM_STATUS_SE1=0x%08X\n",
+		RREG32(GRBM_STATUS_SE1));
+	dev_info(rdev->dev, "  GRBM_STATUS_SE2=0x%08X\n",
+		RREG32(GRBM_STATUS_SE2));
+	dev_info(rdev->dev, "  GRBM_STATUS_SE3=0x%08X\n",
+		RREG32(GRBM_STATUS_SE3));
+	dev_info(rdev->dev, "  SRBM_STATUS=0x%08X\n",
+		RREG32(SRBM_STATUS));
+	dev_info(rdev->dev, "  SRBM_STATUS2=0x%08X\n",
+		RREG32(SRBM_STATUS2));
+	evergreen_mc_stop(rdev, &save);
+	if (radeon_mc_wait_for_idle(rdev)) {
+		dev_warn(rdev->dev, "Wait for MC idle timedout !\n");
+	}
+	/* Disable CP parsing/prefetching */
+	WREG32(CP_ME_CNTL, CP_ME_HALT | CP_PFP_HALT | CP_CE_HALT);
+
+	/* reset all the gfx block and all CPG blocks */
+	grbm_reset = SOFT_RESET_CPG | SOFT_RESET_GFX;
+
+	dev_info(rdev->dev, "  GRBM_SOFT_RESET=0x%08X\n", grbm_reset);
+	WREG32(GRBM_SOFT_RESET, grbm_reset);
+	(void)RREG32(GRBM_SOFT_RESET);
+	udelay(50);
+	WREG32(GRBM_SOFT_RESET, 0);
+	(void)RREG32(GRBM_SOFT_RESET);
+	/* Wait a little for things to settle down */
+	udelay(50);
+	dev_info(rdev->dev, "  GRBM_STATUS=0x%08X\n",
+		RREG32(GRBM_STATUS));
+	dev_info(rdev->dev, "  GRBM_STATUS2=0x%08X\n",
+		RREG32(GRBM_STATUS2));
+	dev_info(rdev->dev, "  GRBM_STATUS_SE0=0x%08X\n",
+		RREG32(GRBM_STATUS_SE0));
+	dev_info(rdev->dev, "  GRBM_STATUS_SE1=0x%08X\n",
+		RREG32(GRBM_STATUS_SE1));
+	dev_info(rdev->dev, "  GRBM_STATUS_SE2=0x%08X\n",
+		RREG32(GRBM_STATUS_SE2));
+	dev_info(rdev->dev, "  GRBM_STATUS_SE3=0x%08X\n",
+		RREG32(GRBM_STATUS_SE3));
+	dev_info(rdev->dev, "  SRBM_STATUS=0x%08X\n",
+		RREG32(SRBM_STATUS));
+	dev_info(rdev->dev, "  SRBM_STATUS2=0x%08X\n",
+		RREG32(SRBM_STATUS2));
+	evergreen_mc_resume(rdev, &save);
+	return 0;
+}
+
+/**
+ * cik_compute_gpu_soft_reset - soft reset CPC
+ *
+ * @rdev: radeon_device pointer
+ *
+ * Soft reset the CPC blocks (CIK).
+ * XXX: deal with reseting RLC and CPF
+ * Returns 0 for success.
+ */
+static int cik_compute_gpu_soft_reset(struct radeon_device *rdev)
+{
+	struct evergreen_mc_save save;
+	u32 grbm_reset = 0;
+
+	dev_info(rdev->dev, "GPU compute softreset \n");
+	dev_info(rdev->dev, "  GRBM_STATUS=0x%08X\n",
+		RREG32(GRBM_STATUS));
+	dev_info(rdev->dev, "  GRBM_STATUS2=0x%08X\n",
+		RREG32(GRBM_STATUS2));
+	dev_info(rdev->dev, "  GRBM_STATUS_SE0=0x%08X\n",
+		RREG32(GRBM_STATUS_SE0));
+	dev_info(rdev->dev, "  GRBM_STATUS_SE1=0x%08X\n",
+		RREG32(GRBM_STATUS_SE1));
+	dev_info(rdev->dev, "  GRBM_STATUS_SE2=0x%08X\n",
+		RREG32(GRBM_STATUS_SE2));
+	dev_info(rdev->dev, "  GRBM_STATUS_SE3=0x%08X\n",
+		RREG32(GRBM_STATUS_SE3));
+	dev_info(rdev->dev, "  SRBM_STATUS=0x%08X\n",
+		RREG32(SRBM_STATUS));
+	dev_info(rdev->dev, "  SRBM_STATUS2=0x%08X\n",
+		RREG32(SRBM_STATUS2));
+	evergreen_mc_stop(rdev, &save);
+	if (radeon_mc_wait_for_idle(rdev)) {
+		dev_warn(rdev->dev, "Wait for MC idle timedout !\n");
+	}
+	/* Disable CP parsing/prefetching */
+	WREG32(CP_MEC_CNTL, MEC_ME1_HALT | MEC_ME2_HALT);
+
+	/* reset all the CPC blocks */
+	grbm_reset = SOFT_RESET_CPG;
+
+	dev_info(rdev->dev, "  GRBM_SOFT_RESET=0x%08X\n", grbm_reset);
+	WREG32(GRBM_SOFT_RESET, grbm_reset);
+	(void)RREG32(GRBM_SOFT_RESET);
+	udelay(50);
+	WREG32(GRBM_SOFT_RESET, 0);
+	(void)RREG32(GRBM_SOFT_RESET);
+	/* Wait a little for things to settle down */
+	udelay(50);
+	dev_info(rdev->dev, "  GRBM_STATUS=0x%08X\n",
+		RREG32(GRBM_STATUS));
+	dev_info(rdev->dev, "  GRBM_STATUS2=0x%08X\n",
+		RREG32(GRBM_STATUS2));
+	dev_info(rdev->dev, "  GRBM_STATUS_SE0=0x%08X\n",
+		RREG32(GRBM_STATUS_SE0));
+	dev_info(rdev->dev, "  GRBM_STATUS_SE1=0x%08X\n",
+		RREG32(GRBM_STATUS_SE1));
+	dev_info(rdev->dev, "  GRBM_STATUS_SE2=0x%08X\n",
+		RREG32(GRBM_STATUS_SE2));
+	dev_info(rdev->dev, "  GRBM_STATUS_SE3=0x%08X\n",
+		RREG32(GRBM_STATUS_SE3));
+	dev_info(rdev->dev, "  SRBM_STATUS=0x%08X\n",
+		RREG32(SRBM_STATUS));
+	dev_info(rdev->dev, "  SRBM_STATUS2=0x%08X\n",
+		RREG32(SRBM_STATUS2));
+	evergreen_mc_resume(rdev, &save);
+	return 0;
+}
+
+/**
+ * cik_asic_reset - soft reset compute and gfx
+ *
+ * @rdev: radeon_device pointer
+ *
+ * Soft reset the CPC blocks (CIK).
+ * XXX: make this more fine grained and only reset
+ * what is necessary.
+ * Returns 0 for success.
+ */
+int cik_asic_reset(struct radeon_device *rdev)
+{
+	int r;
+
+	r = cik_compute_gpu_soft_reset(rdev);
+	if (r)
+		dev_info(rdev->dev, "Compute reset failed!\n");
+
+	return cik_gfx_gpu_soft_reset(rdev);
+}

drivers/gpu/drm/radeon/cikd.h

@@ -30,6 +30,9 @@
 
 #define DMIF_ADDR_CALC  				0xC00
 
+#define	SRBM_STATUS2				        0xE4C
+#define	SRBM_STATUS				        0xE50
+
 #define MC_SHARED_CHMAP						0x2004
 #define		NOOFCHAN_SHIFT					12
 #define		NOOFCHAN_MASK					0x0000f000
@@ -65,6 +68,83 @@
 #define	GRBM_CNTL					0x8000
 #define		GRBM_READ_TIMEOUT(x)				((x) << 0)
 
+#define	GRBM_STATUS2					0x8008
+#define		ME0PIPE1_CMDFIFO_AVAIL_MASK			0x0000000F
+#define		ME0PIPE1_CF_RQ_PENDING				(1 << 4)
+#define		ME0PIPE1_PF_RQ_PENDING				(1 << 5)
+#define		ME1PIPE0_RQ_PENDING				(1 << 6)
+#define		ME1PIPE1_RQ_PENDING				(1 << 7)
+#define		ME1PIPE2_RQ_PENDING				(1 << 8)
+#define		ME1PIPE3_RQ_PENDING				(1 << 9)
+#define		ME2PIPE0_RQ_PENDING				(1 << 10)
+#define		ME2PIPE1_RQ_PENDING				(1 << 11)
+#define		ME2PIPE2_RQ_PENDING				(1 << 12)
+#define		ME2PIPE3_RQ_PENDING				(1 << 13)
+#define		RLC_RQ_PENDING 					(1 << 14)
+#define		RLC_BUSY 					(1 << 24)
+#define		TC_BUSY 					(1 << 25)
+#define		CPF_BUSY 					(1 << 28)
+#define		CPC_BUSY 					(1 << 29)
+#define		CPG_BUSY 					(1 << 30)
+
+#define	GRBM_STATUS					0x8010
+#define		ME0PIPE0_CMDFIFO_AVAIL_MASK			0x0000000F
+#define		SRBM_RQ_PENDING					(1 << 5)
+#define		ME0PIPE0_CF_RQ_PENDING				(1 << 7)
+#define		ME0PIPE0_PF_RQ_PENDING				(1 << 8)
+#define		GDS_DMA_RQ_PENDING				(1 << 9)
+#define		DB_CLEAN					(1 << 12)
+#define		CB_CLEAN					(1 << 13)
+#define		TA_BUSY 					(1 << 14)
+#define		GDS_BUSY 					(1 << 15)
+#define		WD_BUSY_NO_DMA 					(1 << 16)
+#define		VGT_BUSY					(1 << 17)
+#define		IA_BUSY_NO_DMA					(1 << 18)
+#define		IA_BUSY						(1 << 19)
+#define		SX_BUSY 					(1 << 20)
+#define		WD_BUSY 					(1 << 21)
+#define		SPI_BUSY					(1 << 22)
+#define		BCI_BUSY					(1 << 23)
+#define		SC_BUSY 					(1 << 24)
+#define		PA_BUSY 					(1 << 25)
+#define		DB_BUSY 					(1 << 26)
+#define		CP_COHERENCY_BUSY      				(1 << 28)
+#define		CP_BUSY 					(1 << 29)
+#define		CB_BUSY 					(1 << 30)
+#define		GUI_ACTIVE					(1 << 31)
+#define	GRBM_STATUS_SE0					0x8014
+#define	GRBM_STATUS_SE1					0x8018
+#define	GRBM_STATUS_SE2					0x8038
+#define	GRBM_STATUS_SE3					0x803C
+#define		SE_DB_CLEAN					(1 << 1)
+#define		SE_CB_CLEAN					(1 << 2)
+#define		SE_BCI_BUSY					(1 << 22)
+#define		SE_VGT_BUSY					(1 << 23)
+#define		SE_PA_BUSY					(1 << 24)
+#define		SE_TA_BUSY					(1 << 25)
+#define		SE_SX_BUSY					(1 << 26)
+#define		SE_SPI_BUSY					(1 << 27)
+#define		SE_SC_BUSY					(1 << 29)
+#define		SE_DB_BUSY					(1 << 30)
+#define		SE_CB_BUSY					(1 << 31)
+
+#define	GRBM_SOFT_RESET					0x8020
+#define		SOFT_RESET_CP					(1 << 0)  /* All CP blocks */
+#define		SOFT_RESET_RLC					(1 << 2)  /* RLC */
+#define		SOFT_RESET_GFX					(1 << 16) /* GFX */
+#define		SOFT_RESET_CPF					(1 << 17) /* CP fetcher shared by gfx and compute */
+#define		SOFT_RESET_CPC					(1 << 18) /* CP Compute (MEC1/2) */
+#define		SOFT_RESET_CPG					(1 << 19) /* CP GFX (PFP, ME, CE) */
+
+#define CP_MEC_CNTL					0x8234
+#define		MEC_ME2_HALT					(1 << 28)
+#define		MEC_ME1_HALT					(1 << 30)
+
+#define CP_ME_CNTL					0x86D8
+#define		CP_CE_HALT					(1 << 24)
+#define		CP_PFP_HALT					(1 << 26)
+#define		CP_ME_HALT					(1 << 28)
+
 #define CP_MEQ_THRESHOLDS				0x8764
 #define		MEQ1_START(x)				((x) << 0)
 #define		MEQ2_START(x)				((x) << 8)