Commit 6e0c50f9 authored by Philippe Bergheaud's avatar Philippe Bergheaud Committed by Michael Ellerman
Browse files

cxl: Refine slice error debug messages 



The PSL Slice Error Register (PSL_SERR_An) reports implementation
dependent AFU errors, in the form of a bitmap. The PSL_SERR_An
register content is printed in the form of hex dump debug message.

This patch decodes the PSL_ERR_An register contents, and prints a
specific error message for each possible error bit. It also dumps
the secondary registers AFU_ERR_An and PSL_DSISR_An, that may
contain extra debug information.

This patch also removes the large WARN message that used to report
the cxl slice error interrupt, and replaces it by a short informative
message, that draws attention to AFU implementation errors.

Signed-off-by: default avatarPhilippe Bergheaud <felix@linux.vnet.ibm.com>
Acked-by: default avatarIan Munsie <imunsie@au1.ibm.com>
Signed-off-by: default avatarMichael Ellerman <mpe@ellerman.id.au>
parent f5c9df9a

drivers/misc/cxl/cxl.h

+15 −0
Original line number Diff line number Diff line
@@ -189,6 +189,18 @@ static const cxl_p2n_reg_t CXL_PSL_WED_An = {0x0A0}; 
#define CXL_PSL_ID_An_F	(1ull << (63-31))

#define CXL_PSL_ID_An_L	(1ull << (63-30))



/****** CXL_PSL_SERR_An ****************************************************/

#define CXL_PSL_SERR_An_afuto	(1ull << (63-0))

#define CXL_PSL_SERR_An_afudis	(1ull << (63-1))

#define CXL_PSL_SERR_An_afuov	(1ull << (63-2))

#define CXL_PSL_SERR_An_badsrc	(1ull << (63-3))

#define CXL_PSL_SERR_An_badctx	(1ull << (63-4))

#define CXL_PSL_SERR_An_llcmdis	(1ull << (63-5))

#define CXL_PSL_SERR_An_llcmdto	(1ull << (63-6))

#define CXL_PSL_SERR_An_afupar	(1ull << (63-7))

#define CXL_PSL_SERR_An_afudup	(1ull << (63-8))

#define CXL_PSL_SERR_An_AE	(1ull << (63-30))



/****** CXL_PSL_SCNTL_An ****************************************************/

#define CXL_PSL_SCNTL_An_CR          (0x1ull << (63-15))

/* Programming Modes: */
@@ -916,4 +928,7 @@ extern const struct cxl_backend_ops *cxl_ops; 


/* check if the given pci_dev is on the the cxl vphb bus */

bool cxl_pci_is_vphb_device(struct pci_dev *dev);



/* decode AFU error bits in the PSL register PSL_SERR_An */

void cxl_afu_decode_psl_serr(struct cxl_afu *afu, u64 serr);

#endif

drivers/misc/cxl/guest.c

+6 −3
Original line number Diff line number Diff line
@@ -196,15 +196,18 @@ static irqreturn_t guest_slice_irq_err(int irq, void *data) 
{

	struct cxl_afu *afu = data;

	int rc;

	u64 serr;

	u64 serr, afu_error, dsisr;



	WARN(irq, "CXL SLICE ERROR interrupt %i\n", irq);

	rc = cxl_h_get_fn_error_interrupt(afu->guest->handle, &serr);

	if (rc) {

		dev_crit(&afu->dev, "Couldn't read PSL_SERR_An: %d\n", rc);

		return IRQ_HANDLED;

	}

	dev_crit(&afu->dev, "PSL_SERR_An: 0x%.16llx\n", serr);

	afu_error = cxl_p2n_read(afu, CXL_AFU_ERR_An);

	dsisr = cxl_p2n_read(afu, CXL_PSL_DSISR_An);

	cxl_afu_decode_psl_serr(afu, serr);

	dev_crit(&afu->dev, "AFU_ERR_An: 0x%.16llx\n", afu_error);

	dev_crit(&afu->dev, "PSL_DSISR_An: 0x%.16llx\n", dsisr);



	rc = cxl_h_ack_fn_error_interrupt(afu->guest->handle, serr);

	if (rc)

drivers/misc/cxl/irq.c

+29 −0
Original line number Diff line number Diff line
@@ -371,3 +371,32 @@ void afu_release_irqs(struct cxl_context *ctx, void *cookie) 


	ctx->irq_count = 0;

}



void cxl_afu_decode_psl_serr(struct cxl_afu *afu, u64 serr)

{

	dev_crit(&afu->dev,

		 "PSL Slice error received. Check AFU for root cause.\n");

	dev_crit(&afu->dev, "PSL_SERR_An: 0x%016llx\n", serr);

	if (serr & CXL_PSL_SERR_An_afuto)

		dev_crit(&afu->dev, "AFU MMIO Timeout\n");

	if (serr & CXL_PSL_SERR_An_afudis)

		dev_crit(&afu->dev,

			 "MMIO targeted Accelerator that was not enabled\n");

	if (serr & CXL_PSL_SERR_An_afuov)

		dev_crit(&afu->dev, "AFU CTAG Overflow\n");

	if (serr & CXL_PSL_SERR_An_badsrc)

		dev_crit(&afu->dev, "Bad Interrupt Source\n");

	if (serr & CXL_PSL_SERR_An_badctx)

		dev_crit(&afu->dev, "Bad Context Handle\n");

	if (serr & CXL_PSL_SERR_An_llcmdis)

		dev_crit(&afu->dev, "LLCMD to Disabled AFU\n");

	if (serr & CXL_PSL_SERR_An_llcmdto)

		dev_crit(&afu->dev, "LLCMD Timeout to AFU\n");

	if (serr & CXL_PSL_SERR_An_afupar)

		dev_crit(&afu->dev, "AFU MMIO Parity Error\n");

	if (serr & CXL_PSL_SERR_An_afudup)

		dev_crit(&afu->dev, "AFU MMIO Duplicate CTAG Error\n");

	if (serr & CXL_PSL_SERR_An_AE)

		dev_crit(&afu->dev,

			 "AFU asserted JDONE with JERROR in AFU Directed Mode\n");

}

drivers/misc/cxl/native.c

+7 −5
Original line number Diff line number Diff line
@@ -862,7 +862,7 @@ void cxl_native_psl_irq_dump_regs(struct cxl_context *ctx) 
	dev_crit(&ctx->afu->dev, "PSL_FIR2: 0x%016llx\n", fir2);

	if (ctx->afu->adapter->native->sl_ops->register_serr_irq) {

		serr = cxl_p1n_read(ctx->afu, CXL_PSL_SERR_An);

		dev_crit(&ctx->afu->dev, "PSL_SERR_An: 0x%016llx\n", serr);

		cxl_afu_decode_psl_serr(ctx->afu, serr);

	}

	dev_crit(&ctx->afu->dev, "PSL_FIR_SLICE_An: 0x%016llx\n", fir_slice);

	dev_crit(&ctx->afu->dev, "CXL_PSL_AFU_DEBUG_An: 0x%016llx\n", afu_debug);
@@ -956,21 +956,23 @@ void native_irq_wait(struct cxl_context *ctx) 
static irqreturn_t native_slice_irq_err(int irq, void *data)

{

	struct cxl_afu *afu = data;

	u64 fir_slice, errstat, serr, afu_debug;

	u64 fir_slice, errstat, serr, afu_debug, afu_error, dsisr;



	/*

	 * slice err interrupt is only used with full PSL (no XSL)

	 */

	WARN(irq, "CXL SLICE ERROR interrupt %i\n", irq);



	serr = cxl_p1n_read(afu, CXL_PSL_SERR_An);

	fir_slice = cxl_p1n_read(afu, CXL_PSL_FIR_SLICE_An);

	errstat = cxl_p2n_read(afu, CXL_PSL_ErrStat_An);

	afu_debug = cxl_p1n_read(afu, CXL_AFU_DEBUG_An);

	dev_crit(&afu->dev, "PSL_SERR_An: 0x%016llx\n", serr);

	afu_error = cxl_p2n_read(afu, CXL_AFU_ERR_An);

	dsisr = cxl_p2n_read(afu, CXL_PSL_DSISR_An);

	cxl_afu_decode_psl_serr(afu, serr);

	dev_crit(&afu->dev, "PSL_FIR_SLICE_An: 0x%016llx\n", fir_slice);

	dev_crit(&afu->dev, "CXL_PSL_ErrStat_An: 0x%016llx\n", errstat);

	dev_crit(&afu->dev, "CXL_PSL_AFU_DEBUG_An: 0x%016llx\n", afu_debug);

	dev_crit(&afu->dev, "AFU_ERR_An: 0x%.16llx\n", afu_error);

	dev_crit(&afu->dev, "PSL_DSISR_An: 0x%.16llx\n", dsisr);



	cxl_p1n_write(afu, CXL_PSL_SERR_An, serr);

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