drivers/misc/cxl/irq.c - kernel/msm-4.9 - Gitiles

 /*
  * Copyright 2014 IBM Corp.
  *
  * This program is free software; you can redistribute it and/or
  * modify it under the terms of the GNU General Public License
  * as published by the Free Software Foundation; either version
  * 2 of the License, or (at your option) any later version.
  */

 #include <linux/interrupt.h>
 #include <linux/workqueue.h>
 #include <linux/sched.h>
 #include <linux/wait.h>
 #include <linux/slab.h>
 #include <linux/pid.h>
 #include <asm/cputable.h>
 #include <misc/cxl.h>

 #include "cxl.h"
 #include "trace.h"

 /* XXX: This is implementation specific */
 static irqreturn_t handle_psl_slice_error(struct cxl_context *ctx, u64 dsisr, u64 errstat)
 {
 	u64 fir1, fir2, fir_slice, serr, afu_debug;

 	fir1 = cxl_p1_read(ctx->afu->adapter, CXL_PSL_FIR1);
 	fir2 = cxl_p1_read(ctx->afu->adapter, CXL_PSL_FIR2);
 	fir_slice = cxl_p1n_read(ctx->afu, CXL_PSL_FIR_SLICE_An);
 	serr = cxl_p1n_read(ctx->afu, CXL_PSL_SERR_An);
 	afu_debug = cxl_p1n_read(ctx->afu, CXL_AFU_DEBUG_An);

 	dev_crit(&ctx->afu->dev, "PSL ERROR STATUS: 0x%.16llx\n", errstat);
 	dev_crit(&ctx->afu->dev, "PSL_FIR1: 0x%.16llx\n", fir1);
 	dev_crit(&ctx->afu->dev, "PSL_FIR2: 0x%.16llx\n", fir2);
 	dev_crit(&ctx->afu->dev, "PSL_SERR_An: 0x%.16llx\n", serr);
 	dev_crit(&ctx->afu->dev, "PSL_FIR_SLICE_An: 0x%.16llx\n", fir_slice);
 	dev_crit(&ctx->afu->dev, "CXL_PSL_AFU_DEBUG_An: 0x%.16llx\n", afu_debug);

 	dev_crit(&ctx->afu->dev, "STOPPING CXL TRACE\n");
 	cxl_stop_trace(ctx->afu->adapter);

 	return cxl_ack_irq(ctx, 0, errstat);
 }

 irqreturn_t cxl_slice_irq_err(int irq, void *data)
 {
 	struct cxl_afu *afu = data;
 	u64 fir_slice, errstat, serr, afu_debug;

 	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%.16llx\n", serr);
 	dev_crit(&afu->dev, "PSL_FIR_SLICE_An: 0x%.16llx\n", fir_slice);
 	dev_crit(&afu->dev, "CXL_PSL_ErrStat_An: 0x%.16llx\n", errstat);
 	dev_crit(&afu->dev, "CXL_PSL_AFU_DEBUG_An: 0x%.16llx\n", afu_debug);

 	cxl_p1n_write(afu, CXL_PSL_SERR_An, serr);

 	return IRQ_HANDLED;
 }

 static irqreturn_t cxl_irq_err(int irq, void *data)
 {
 	struct cxl *adapter = data;
 	u64 fir1, fir2, err_ivte;

 	WARN(1, "CXL ERROR interrupt %i\n", irq);

 	err_ivte = cxl_p1_read(adapter, CXL_PSL_ErrIVTE);
 	dev_crit(&adapter->dev, "PSL_ErrIVTE: 0x%.16llx\n", err_ivte);

 	dev_crit(&adapter->dev, "STOPPING CXL TRACE\n");
 	cxl_stop_trace(adapter);

 	fir1 = cxl_p1_read(adapter, CXL_PSL_FIR1);
 	fir2 = cxl_p1_read(adapter, CXL_PSL_FIR2);

 	dev_crit(&adapter->dev, "PSL_FIR1: 0x%.16llx\nPSL_FIR2: 0x%.16llx\n", fir1, fir2);

 	return IRQ_HANDLED;
 }

 static irqreturn_t schedule_cxl_fault(struct cxl_context *ctx, u64 dsisr, u64 dar)
 {
 	ctx->dsisr = dsisr;
 	ctx->dar = dar;
 	schedule_work(&ctx->fault_work);
 	return IRQ_HANDLED;
 }

 static irqreturn_t cxl_irq(int irq, void *data, struct cxl_irq_info *irq_info)
 {
 	struct cxl_context *ctx = data;
 	u64 dsisr, dar;

 	dsisr = irq_info->dsisr;
 	dar = irq_info->dar;

 	trace_cxl_psl_irq(ctx, irq, dsisr, dar);

 	pr_devel("CXL interrupt %i for afu pe: %i DSISR: %#llx DAR: %#llx\n", irq, ctx->pe, dsisr, dar);

 	if (dsisr & CXL_PSL_DSISR_An_DS) {
 		/*
 		 * We don't inherently need to sleep to handle this, but we do
 		 * need to get a ref to the task's mm, which we can't do from
 		 * irq context without the potential for a deadlock since it
 		 * takes the task_lock. An alternate option would be to keep a
 		 * reference to the task's mm the entire time it has cxl open,
 		 * but to do that we need to solve the issue where we hold a
 		 * ref to the mm, but the mm can hold a ref to the fd after an
 		 * mmap preventing anything from being cleaned up.
 		 */
 		pr_devel("Scheduling segment miss handling for later pe: %i\n", ctx->pe);
 		return schedule_cxl_fault(ctx, dsisr, dar);
 	}

 	if (dsisr & CXL_PSL_DSISR_An_M)
 		pr_devel("CXL interrupt: PTE not found\n");
 	if (dsisr & CXL_PSL_DSISR_An_P)
 		pr_devel("CXL interrupt: Storage protection violation\n");
 	if (dsisr & CXL_PSL_DSISR_An_A)
 		pr_devel("CXL interrupt: AFU lock access to write through or cache inhibited storage\n");
 	if (dsisr & CXL_PSL_DSISR_An_S)
 		pr_devel("CXL interrupt: Access was afu_wr or afu_zero\n");
 	if (dsisr & CXL_PSL_DSISR_An_K)
 		pr_devel("CXL interrupt: Access not permitted by virtual page class key protection\n");

 	if (dsisr & CXL_PSL_DSISR_An_DM) {
 		/*
 		 * In some cases we might be able to handle the fault
 		 * immediately if hash_page would succeed, but we still need
 		 * the task's mm, which as above we can't get without a lock
 		 */
 		pr_devel("Scheduling page fault handling for later pe: %i\n", ctx->pe);
 		return schedule_cxl_fault(ctx, dsisr, dar);
 	}
 	if (dsisr & CXL_PSL_DSISR_An_ST)
 		WARN(1, "CXL interrupt: Segment Table PTE not found\n");
 	if (dsisr & CXL_PSL_DSISR_An_UR)
 		pr_devel("CXL interrupt: AURP PTE not found\n");
 	if (dsisr & CXL_PSL_DSISR_An_PE)
 		return handle_psl_slice_error(ctx, dsisr, irq_info->errstat);
 	if (dsisr & CXL_PSL_DSISR_An_AE) {
 		pr_devel("CXL interrupt: AFU Error %.llx\n", irq_info->afu_err);

 		if (ctx->pending_afu_err) {
 			/*
 			 * This shouldn't happen - the PSL treats these errors
 			 * as fatal and will have reset the AFU, so there's not
 			 * much point buffering multiple AFU errors.
 			 * OTOH if we DO ever see a storm of these come in it's
 			 * probably best that we log them somewhere:
 			 */
 			dev_err_ratelimited(&ctx->afu->dev, "CXL AFU Error "
 					    "undelivered to pe %i: %.llx\n",
 					    ctx->pe, irq_info->afu_err);
 		} else {
 			spin_lock(&ctx->lock);
 			ctx->afu_err = irq_info->afu_err;
 			ctx->pending_afu_err = 1;
 			spin_unlock(&ctx->lock);

 			wake_up_all(&ctx->wq);
 		}

 		cxl_ack_irq(ctx, CXL_PSL_TFC_An_A, 0);
 		return IRQ_HANDLED;
 	}
 	if (dsisr & CXL_PSL_DSISR_An_OC)
 		pr_devel("CXL interrupt: OS Context Warning\n");

 	WARN(1, "Unhandled CXL PSL IRQ\n");
 	return IRQ_HANDLED;
 }

 static irqreturn_t fail_psl_irq(struct cxl_afu *afu, struct cxl_irq_info *irq_info)
 {
 	if (irq_info->dsisr & CXL_PSL_DSISR_TRANS)
 		cxl_p2n_write(afu, CXL_PSL_TFC_An, CXL_PSL_TFC_An_AE);
 	else
 		cxl_p2n_write(afu, CXL_PSL_TFC_An, CXL_PSL_TFC_An_A);

 	return IRQ_HANDLED;
 }

 static irqreturn_t cxl_irq_multiplexed(int irq, void *data)
 {
 	struct cxl_afu *afu = data;
 	struct cxl_context *ctx;
 	struct cxl_irq_info irq_info;
 	int ph = cxl_p2n_read(afu, CXL_PSL_PEHandle_An) & 0xffff;
 	int ret;

 	if ((ret = cxl_get_irq(afu, &irq_info))) {
 		WARN(1, "Unable to get CXL IRQ Info: %i\n", ret);
 		return fail_psl_irq(afu, &irq_info);
 	}

 	rcu_read_lock();
 	ctx = idr_find(&afu->contexts_idr, ph);
 	if (ctx) {
 		ret = cxl_irq(irq, ctx, &irq_info);
 		rcu_read_unlock();
 		return ret;
 	}
 	rcu_read_unlock();

 	WARN(1, "Unable to demultiplex CXL PSL IRQ for PE %i DSISR %.16llx DAR"
 		" %.16llx\n(Possible AFU HW issue - was a term/remove acked"
 		" with outstanding transactions?)\n", ph, irq_info.dsisr,
 		irq_info.dar);
 	return fail_psl_irq(afu, &irq_info);
 }

 static irqreturn_t cxl_irq_afu(int irq, void *data)
 {
 	struct cxl_context *ctx = data;
 	irq_hw_number_t hwirq = irqd_to_hwirq(irq_get_irq_data(irq));
 	int irq_off, afu_irq = 1;
 	__u16 range;
 	int r;

 	for (r = 1; r < CXL_IRQ_RANGES; r++) {
 		irq_off = hwirq - ctx->irqs.offset[r];
 		range = ctx->irqs.range[r];
 		if (irq_off >= 0 && irq_off < range) {
 			afu_irq += irq_off;
 			break;
 		}
 		afu_irq += range;
 	}
 	if (unlikely(r >= CXL_IRQ_RANGES)) {
 		WARN(1, "Recieved AFU IRQ out of range for pe %i (virq %i hwirq %lx)\n",
 		     ctx->pe, irq, hwirq);
 		return IRQ_HANDLED;
 	}

 	trace_cxl_afu_irq(ctx, afu_irq, irq, hwirq);
 	pr_devel("Received AFU interrupt %i for pe: %i (virq %i hwirq %lx)\n",
 	       afu_irq, ctx->pe, irq, hwirq);

 	if (unlikely(!ctx->irq_bitmap)) {
 		WARN(1, "Recieved AFU IRQ for context with no IRQ bitmap\n");
 		return IRQ_HANDLED;
 	}
 	spin_lock(&ctx->lock);
 	set_bit(afu_irq - 1, ctx->irq_bitmap);
 	ctx->pending_irq = true;
 	spin_unlock(&ctx->lock);

 	wake_up_all(&ctx->wq);

 	return IRQ_HANDLED;
 }

 unsigned int cxl_map_irq(struct cxl *adapter, irq_hw_number_t hwirq,
 			 irq_handler_t handler, void *cookie, const char *name)
 {
 	unsigned int virq;
 	int result;

 	/* IRQ Domain? */
 	virq = irq_create_mapping(NULL, hwirq);
 	if (!virq) {
 		dev_warn(&adapter->dev, "cxl_map_irq: irq_create_mapping failed\n");
 		return 0;
 	}

 	cxl_setup_irq(adapter, hwirq, virq);

 	pr_devel("hwirq %#lx mapped to virq %u\n", hwirq, virq);

 	result = request_irq(virq, handler, 0, name, cookie);
 	if (result) {
 		dev_warn(&adapter->dev, "cxl_map_irq: request_irq failed: %i\n", result);
 		return 0;
 	}

 	return virq;
 }

 void cxl_unmap_irq(unsigned int virq, void *cookie)
 {
 	free_irq(virq, cookie);
 	irq_dispose_mapping(virq);
 }

 static int cxl_register_one_irq(struct cxl *adapter,
 				irq_handler_t handler,
 				void *cookie,
 				irq_hw_number_t *dest_hwirq,
 				unsigned int *dest_virq,
 				const char *name)
 {
 	int hwirq, virq;

 	if ((hwirq = cxl_alloc_one_irq(adapter)) < 0)
 		return hwirq;

 	if (!(virq = cxl_map_irq(adapter, hwirq, handler, cookie, name)))
 		goto err;

 	*dest_hwirq = hwirq;
 	*dest_virq = virq;

 	return 0;

 err:
 	cxl_release_one_irq(adapter, hwirq);
 	return -ENOMEM;
 }

 int cxl_register_psl_err_irq(struct cxl *adapter)
 {
 	int rc;

 	adapter->irq_name = kasprintf(GFP_KERNEL, "cxl-%s-err",
 				      dev_name(&adapter->dev));
 	if (!adapter->irq_name)
 		return -ENOMEM;

 	if ((rc = cxl_register_one_irq(adapter, cxl_irq_err, adapter,
 				       &adapter->err_hwirq,
 				       &adapter->err_virq,
 				       adapter->irq_name))) {
 		kfree(adapter->irq_name);
 		adapter->irq_name = NULL;
 		return rc;
 	}

 	cxl_p1_write(adapter, CXL_PSL_ErrIVTE, adapter->err_hwirq & 0xffff);

 	return 0;
 }

 void cxl_release_psl_err_irq(struct cxl *adapter)
 {
 	cxl_p1_write(adapter, CXL_PSL_ErrIVTE, 0x0000000000000000);
 	cxl_unmap_irq(adapter->err_virq, adapter);
 	cxl_release_one_irq(adapter, adapter->err_hwirq);
 	kfree(adapter->irq_name);
 }

 int cxl_register_serr_irq(struct cxl_afu *afu)
 {
 	u64 serr;
 	int rc;

 	afu->err_irq_name = kasprintf(GFP_KERNEL, "cxl-%s-err",
 				      dev_name(&afu->dev));
 	if (!afu->err_irq_name)
 		return -ENOMEM;

 	if ((rc = cxl_register_one_irq(afu->adapter, cxl_slice_irq_err, afu,
 				       &afu->serr_hwirq,
 				       &afu->serr_virq, afu->err_irq_name))) {
 		kfree(afu->err_irq_name);
 		afu->err_irq_name = NULL;
 		return rc;
 	}

 	serr = cxl_p1n_read(afu, CXL_PSL_SERR_An);
 	serr = (serr & 0x00ffffffffff0000ULL) | (afu->serr_hwirq & 0xffff);
 	cxl_p1n_write(afu, CXL_PSL_SERR_An, serr);

 	return 0;
 }

 void cxl_release_serr_irq(struct cxl_afu *afu)
 {
 	cxl_p1n_write(afu, CXL_PSL_SERR_An, 0x0000000000000000);
 	cxl_unmap_irq(afu->serr_virq, afu);
 	cxl_release_one_irq(afu->adapter, afu->serr_hwirq);
 	kfree(afu->err_irq_name);
 }

 int cxl_register_psl_irq(struct cxl_afu *afu)
 {
 	int rc;

 	afu->psl_irq_name = kasprintf(GFP_KERNEL, "cxl-%s",
 				      dev_name(&afu->dev));
 	if (!afu->psl_irq_name)
 		return -ENOMEM;

 	if ((rc = cxl_register_one_irq(afu->adapter, cxl_irq_multiplexed, afu,
 				    &afu->psl_hwirq, &afu->psl_virq,
 				    afu->psl_irq_name))) {
 		kfree(afu->psl_irq_name);
 		afu->psl_irq_name = NULL;
 	}
 	return rc;
 }

 void cxl_release_psl_irq(struct cxl_afu *afu)
 {
 	cxl_unmap_irq(afu->psl_virq, afu);
 	cxl_release_one_irq(afu->adapter, afu->psl_hwirq);
 	kfree(afu->psl_irq_name);
 }

 void afu_irq_name_free(struct cxl_context *ctx)
 {
 	struct cxl_irq_name *irq_name, *tmp;

 	list_for_each_entry_safe(irq_name, tmp, &ctx->irq_names, list) {
 		kfree(irq_name->name);
 		list_del(&irq_name->list);
 		kfree(irq_name);
 	}
 }

 int afu_register_irqs(struct cxl_context *ctx, u32 count)
 {
 	irq_hw_number_t hwirq;
 	int rc, r, i, j = 1;
 	struct cxl_irq_name *irq_name;

 	if ((rc = cxl_alloc_irq_ranges(&ctx->irqs, ctx->afu->adapter, count)))
 		return rc;

 	/* Multiplexed PSL Interrupt */
 	ctx->irqs.offset[0] = ctx->afu->psl_hwirq;
 	ctx->irqs.range[0] = 1;

 	ctx->irq_count = count;
 	ctx->irq_bitmap = kcalloc(BITS_TO_LONGS(count),
 				  sizeof(*ctx->irq_bitmap), GFP_KERNEL);
 	if (!ctx->irq_bitmap)
 		return -ENOMEM;

 	/*
 	 * Allocate names first.  If any fail, bail out before allocating
 	 * actual hardware IRQs.
 	 */
 	INIT_LIST_HEAD(&ctx->irq_names);
 	for (r = 1; r < CXL_IRQ_RANGES; r++) {
 		for (i = 0; i < ctx->irqs.range[r]; i++) {
 			irq_name = kmalloc(sizeof(struct cxl_irq_name),
 					   GFP_KERNEL);
 			if (!irq_name)
 				goto out;
 			irq_name->name = kasprintf(GFP_KERNEL, "cxl-%s-pe%i-%i",
 						   dev_name(&ctx->afu->dev),
 						   ctx->pe, j);
 			if (!irq_name->name) {
 				kfree(irq_name);
 				goto out;
 			}
 			/* Add to tail so next look get the correct order */
 			list_add_tail(&irq_name->list, &ctx->irq_names);
 			j++;
 		}
 	}

 	/* We've allocated all memory now, so let's do the irq allocations */
 	irq_name = list_first_entry(&ctx->irq_names, struct cxl_irq_name, list);
 	for (r = 1; r < CXL_IRQ_RANGES; r++) {
 		hwirq = ctx->irqs.offset[r];
 		for (i = 0; i < ctx->irqs.range[r]; hwirq++, i++) {
 			cxl_map_irq(ctx->afu->adapter, hwirq,
 				    cxl_irq_afu, ctx, irq_name->name);
 			irq_name = list_next_entry(irq_name, list);
 		}
 	}

 	return 0;

 out:
 	afu_irq_name_free(ctx);
 	return -ENOMEM;
 }

 void afu_release_irqs(struct cxl_context *ctx)
 {
 	irq_hw_number_t hwirq;
 	unsigned int virq;
 	int r, i;

 	for (r = 1; r < CXL_IRQ_RANGES; r++) {
 		hwirq = ctx->irqs.offset[r];
 		for (i = 0; i < ctx->irqs.range[r]; hwirq++, i++) {
 			virq = irq_find_mapping(NULL, hwirq);
 			if (virq)
 				cxl_unmap_irq(virq, ctx);
 		}
 	}

 	afu_irq_name_free(ctx);
 	cxl_release_irq_ranges(&ctx->irqs, ctx->afu->adapter);
 }
	/*
	* Copyright 2014 IBM Corp.
	*
	* This program is free software; you can redistribute it and/or
	* modify it under the terms of the GNU General Public License
	* as published by the Free Software Foundation; either version
	* 2 of the License, or (at your option) any later version.
	*/

	#include <linux/interrupt.h>
	#include <linux/workqueue.h>
	#include <linux/sched.h>
	#include <linux/wait.h>
	#include <linux/slab.h>
	#include <linux/pid.h>
	#include <asm/cputable.h>
	#include <misc/cxl.h>

	#include "cxl.h"
	#include "trace.h"

	/* XXX: This is implementation specific */
	static irqreturn_t handle_psl_slice_error(struct cxl_context *ctx, u64 dsisr, u64 errstat)
	{
	u64 fir1, fir2, fir_slice, serr, afu_debug;

	fir1 = cxl_p1_read(ctx->afu->adapter, CXL_PSL_FIR1);
	fir2 = cxl_p1_read(ctx->afu->adapter, CXL_PSL_FIR2);
	fir_slice = cxl_p1n_read(ctx->afu, CXL_PSL_FIR_SLICE_An);
	serr = cxl_p1n_read(ctx->afu, CXL_PSL_SERR_An);
	afu_debug = cxl_p1n_read(ctx->afu, CXL_AFU_DEBUG_An);

	dev_crit(&ctx->afu->dev, "PSL ERROR STATUS: 0x%.16llx\n", errstat);
	dev_crit(&ctx->afu->dev, "PSL_FIR1: 0x%.16llx\n", fir1);
	dev_crit(&ctx->afu->dev, "PSL_FIR2: 0x%.16llx\n", fir2);
	dev_crit(&ctx->afu->dev, "PSL_SERR_An: 0x%.16llx\n", serr);
	dev_crit(&ctx->afu->dev, "PSL_FIR_SLICE_An: 0x%.16llx\n", fir_slice);
	dev_crit(&ctx->afu->dev, "CXL_PSL_AFU_DEBUG_An: 0x%.16llx\n", afu_debug);

	dev_crit(&ctx->afu->dev, "STOPPING CXL TRACE\n");
	cxl_stop_trace(ctx->afu->adapter);

	return cxl_ack_irq(ctx, 0, errstat);
	}

	irqreturn_t cxl_slice_irq_err(int irq, void *data)
	{
	struct cxl_afu *afu = data;
	u64 fir_slice, errstat, serr, afu_debug;

	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%.16llx\n", serr);
	dev_crit(&afu->dev, "PSL_FIR_SLICE_An: 0x%.16llx\n", fir_slice);
	dev_crit(&afu->dev, "CXL_PSL_ErrStat_An: 0x%.16llx\n", errstat);
	dev_crit(&afu->dev, "CXL_PSL_AFU_DEBUG_An: 0x%.16llx\n", afu_debug);

	cxl_p1n_write(afu, CXL_PSL_SERR_An, serr);

	return IRQ_HANDLED;
	}

	static irqreturn_t cxl_irq_err(int irq, void *data)
	{
	struct cxl *adapter = data;
	u64 fir1, fir2, err_ivte;

	WARN(1, "CXL ERROR interrupt %i\n", irq);

	err_ivte = cxl_p1_read(adapter, CXL_PSL_ErrIVTE);
	dev_crit(&adapter->dev, "PSL_ErrIVTE: 0x%.16llx\n", err_ivte);

	dev_crit(&adapter->dev, "STOPPING CXL TRACE\n");
	cxl_stop_trace(adapter);

	fir1 = cxl_p1_read(adapter, CXL_PSL_FIR1);
	fir2 = cxl_p1_read(adapter, CXL_PSL_FIR2);

	dev_crit(&adapter->dev, "PSL_FIR1: 0x%.16llx\nPSL_FIR2: 0x%.16llx\n", fir1, fir2);

	return IRQ_HANDLED;
	}

	static irqreturn_t schedule_cxl_fault(struct cxl_context *ctx, u64 dsisr, u64 dar)
	{
	ctx->dsisr = dsisr;
	ctx->dar = dar;
	schedule_work(&ctx->fault_work);
	return IRQ_HANDLED;
	}

	static irqreturn_t cxl_irq(int irq, void data, struct cxl_irq_info irq_info)
	{
	struct cxl_context *ctx = data;
	u64 dsisr, dar;

	dsisr = irq_info->dsisr;
	dar = irq_info->dar;

	trace_cxl_psl_irq(ctx, irq, dsisr, dar);

	pr_devel("CXL interrupt %i for afu pe: %i DSISR: %#llx DAR: %#llx\n", irq, ctx->pe, dsisr, dar);

	if (dsisr & CXL_PSL_DSISR_An_DS) {
	/*
	* We don't inherently need to sleep to handle this, but we do
	* need to get a ref to the task's mm, which we can't do from
	* irq context without the potential for a deadlock since it
	* takes the task_lock. An alternate option would be to keep a
	* reference to the task's mm the entire time it has cxl open,
	* but to do that we need to solve the issue where we hold a
	* ref to the mm, but the mm can hold a ref to the fd after an
	* mmap preventing anything from being cleaned up.
	*/
	pr_devel("Scheduling segment miss handling for later pe: %i\n", ctx->pe);
	return schedule_cxl_fault(ctx, dsisr, dar);
	}

	if (dsisr & CXL_PSL_DSISR_An_M)
	pr_devel("CXL interrupt: PTE not found\n");
	if (dsisr & CXL_PSL_DSISR_An_P)
	pr_devel("CXL interrupt: Storage protection violation\n");
	if (dsisr & CXL_PSL_DSISR_An_A)
	pr_devel("CXL interrupt: AFU lock access to write through or cache inhibited storage\n");
	if (dsisr & CXL_PSL_DSISR_An_S)
	pr_devel("CXL interrupt: Access was afu_wr or afu_zero\n");
	if (dsisr & CXL_PSL_DSISR_An_K)
	pr_devel("CXL interrupt: Access not permitted by virtual page class key protection\n");

	if (dsisr & CXL_PSL_DSISR_An_DM) {
	/*
	* In some cases we might be able to handle the fault
	* immediately if hash_page would succeed, but we still need
	* the task's mm, which as above we can't get without a lock
	*/
	pr_devel("Scheduling page fault handling for later pe: %i\n", ctx->pe);
	return schedule_cxl_fault(ctx, dsisr, dar);
	}
	if (dsisr & CXL_PSL_DSISR_An_ST)
	WARN(1, "CXL interrupt: Segment Table PTE not found\n");
	if (dsisr & CXL_PSL_DSISR_An_UR)
	pr_devel("CXL interrupt: AURP PTE not found\n");
	if (dsisr & CXL_PSL_DSISR_An_PE)
	return handle_psl_slice_error(ctx, dsisr, irq_info->errstat);
	if (dsisr & CXL_PSL_DSISR_An_AE) {
	pr_devel("CXL interrupt: AFU Error %.llx\n", irq_info->afu_err);

	if (ctx->pending_afu_err) {
	/*
	* This shouldn't happen - the PSL treats these errors
	* as fatal and will have reset the AFU, so there's not
	* much point buffering multiple AFU errors.
	* OTOH if we DO ever see a storm of these come in it's
	* probably best that we log them somewhere:
	*/
	dev_err_ratelimited(&ctx->afu->dev, "CXL AFU Error "
	"undelivered to pe %i: %.llx\n",
	ctx->pe, irq_info->afu_err);
	} else {
	spin_lock(&ctx->lock);
	ctx->afu_err = irq_info->afu_err;
	ctx->pending_afu_err = 1;
	spin_unlock(&ctx->lock);

	wake_up_all(&ctx->wq);
	}

	cxl_ack_irq(ctx, CXL_PSL_TFC_An_A, 0);
	return IRQ_HANDLED;
	}
	if (dsisr & CXL_PSL_DSISR_An_OC)
	pr_devel("CXL interrupt: OS Context Warning\n");

	WARN(1, "Unhandled CXL PSL IRQ\n");
	return IRQ_HANDLED;
	}

	static irqreturn_t fail_psl_irq(struct cxl_afu afu, struct cxl_irq_info irq_info)
	{
	if (irq_info->dsisr & CXL_PSL_DSISR_TRANS)
	cxl_p2n_write(afu, CXL_PSL_TFC_An, CXL_PSL_TFC_An_AE);
	else
	cxl_p2n_write(afu, CXL_PSL_TFC_An, CXL_PSL_TFC_An_A);

	return IRQ_HANDLED;
	}

	static irqreturn_t cxl_irq_multiplexed(int irq, void *data)
	{
	struct cxl_afu *afu = data;
	struct cxl_context *ctx;
	struct cxl_irq_info irq_info;
	int ph = cxl_p2n_read(afu, CXL_PSL_PEHandle_An) & 0xffff;
	int ret;

	if ((ret = cxl_get_irq(afu, &irq_info))) {
	WARN(1, "Unable to get CXL IRQ Info: %i\n", ret);
	return fail_psl_irq(afu, &irq_info);
	}

	rcu_read_lock();
	ctx = idr_find(&afu->contexts_idr, ph);
	if (ctx) {
	ret = cxl_irq(irq, ctx, &irq_info);
	rcu_read_unlock();
	return ret;
	}
	rcu_read_unlock();

	WARN(1, "Unable to demultiplex CXL PSL IRQ for PE %i DSISR %.16llx DAR"
	" %.16llx\n(Possible AFU HW issue - was a term/remove acked"
	" with outstanding transactions?)\n", ph, irq_info.dsisr,
	irq_info.dar);
	return fail_psl_irq(afu, &irq_info);
	}

	static irqreturn_t cxl_irq_afu(int irq, void *data)
	{
	struct cxl_context *ctx = data;
	irq_hw_number_t hwirq = irqd_to_hwirq(irq_get_irq_data(irq));
	int irq_off, afu_irq = 1;
	__u16 range;
	int r;

	for (r = 1; r < CXL_IRQ_RANGES; r++) {
	irq_off = hwirq - ctx->irqs.offset[r];
	range = ctx->irqs.range[r];
	if (irq_off >= 0 && irq_off < range) {
	afu_irq += irq_off;
	break;
	}
	afu_irq += range;
	}
	if (unlikely(r >= CXL_IRQ_RANGES)) {
	WARN(1, "Recieved AFU IRQ out of range for pe %i (virq %i hwirq %lx)\n",
	ctx->pe, irq, hwirq);
	return IRQ_HANDLED;
	}

	trace_cxl_afu_irq(ctx, afu_irq, irq, hwirq);
	pr_devel("Received AFU interrupt %i for pe: %i (virq %i hwirq %lx)\n",
	afu_irq, ctx->pe, irq, hwirq);

	if (unlikely(!ctx->irq_bitmap)) {
	WARN(1, "Recieved AFU IRQ for context with no IRQ bitmap\n");
	return IRQ_HANDLED;
	}
	spin_lock(&ctx->lock);
	set_bit(afu_irq - 1, ctx->irq_bitmap);
	ctx->pending_irq = true;
	spin_unlock(&ctx->lock);

	wake_up_all(&ctx->wq);

	return IRQ_HANDLED;
	}

	unsigned int cxl_map_irq(struct cxl *adapter, irq_hw_number_t hwirq,
	irq_handler_t handler, void cookie, const char name)
	{
	unsigned int virq;
	int result;

	/* IRQ Domain? */
	virq = irq_create_mapping(NULL, hwirq);
	if (!virq) {
	dev_warn(&adapter->dev, "cxl_map_irq: irq_create_mapping failed\n");
	return 0;
	}

	cxl_setup_irq(adapter, hwirq, virq);

	pr_devel("hwirq %#lx mapped to virq %u\n", hwirq, virq);

	result = request_irq(virq, handler, 0, name, cookie);
	if (result) {
	dev_warn(&adapter->dev, "cxl_map_irq: request_irq failed: %i\n", result);
	return 0;
	}

	return virq;
	}

	void cxl_unmap_irq(unsigned int virq, void *cookie)
	{
	free_irq(virq, cookie);
	irq_dispose_mapping(virq);
	}

	static int cxl_register_one_irq(struct cxl *adapter,
	irq_handler_t handler,
	void *cookie,
	irq_hw_number_t *dest_hwirq,
	unsigned int *dest_virq,
	const char *name)
	{
	int hwirq, virq;

	if ((hwirq = cxl_alloc_one_irq(adapter)) < 0)
	return hwirq;

	if (!(virq = cxl_map_irq(adapter, hwirq, handler, cookie, name)))
	goto err;

	*dest_hwirq = hwirq;
	*dest_virq = virq;

	return 0;

	err:
	cxl_release_one_irq(adapter, hwirq);
	return -ENOMEM;
	}

	int cxl_register_psl_err_irq(struct cxl *adapter)
	{
	int rc;

	adapter->irq_name = kasprintf(GFP_KERNEL, "cxl-%s-err",
	dev_name(&adapter->dev));
	if (!adapter->irq_name)
	return -ENOMEM;

	if ((rc = cxl_register_one_irq(adapter, cxl_irq_err, adapter,
	&adapter->err_hwirq,
	&adapter->err_virq,
	adapter->irq_name))) {
	kfree(adapter->irq_name);
	adapter->irq_name = NULL;
	return rc;
	}

	cxl_p1_write(adapter, CXL_PSL_ErrIVTE, adapter->err_hwirq & 0xffff);

	return 0;
	}

	void cxl_release_psl_err_irq(struct cxl *adapter)
	{
	cxl_p1_write(adapter, CXL_PSL_ErrIVTE, 0x0000000000000000);
	cxl_unmap_irq(adapter->err_virq, adapter);
	cxl_release_one_irq(adapter, adapter->err_hwirq);
	kfree(adapter->irq_name);
	}

	int cxl_register_serr_irq(struct cxl_afu *afu)
	{
	u64 serr;
	int rc;

	afu->err_irq_name = kasprintf(GFP_KERNEL, "cxl-%s-err",
	dev_name(&afu->dev));
	if (!afu->err_irq_name)
	return -ENOMEM;

	if ((rc = cxl_register_one_irq(afu->adapter, cxl_slice_irq_err, afu,
	&afu->serr_hwirq,
	&afu->serr_virq, afu->err_irq_name))) {
	kfree(afu->err_irq_name);
	afu->err_irq_name = NULL;
	return rc;
	}

	serr = cxl_p1n_read(afu, CXL_PSL_SERR_An);
	serr = (serr & 0x00ffffffffff0000ULL) \| (afu->serr_hwirq & 0xffff);
	cxl_p1n_write(afu, CXL_PSL_SERR_An, serr);

	return 0;
	}

	void cxl_release_serr_irq(struct cxl_afu *afu)
	{
	cxl_p1n_write(afu, CXL_PSL_SERR_An, 0x0000000000000000);
	cxl_unmap_irq(afu->serr_virq, afu);
	cxl_release_one_irq(afu->adapter, afu->serr_hwirq);
	kfree(afu->err_irq_name);
	}

	int cxl_register_psl_irq(struct cxl_afu *afu)
	{
	int rc;

	afu->psl_irq_name = kasprintf(GFP_KERNEL, "cxl-%s",
	dev_name(&afu->dev));
	if (!afu->psl_irq_name)
	return -ENOMEM;

	if ((rc = cxl_register_one_irq(afu->adapter, cxl_irq_multiplexed, afu,
	&afu->psl_hwirq, &afu->psl_virq,
	afu->psl_irq_name))) {
	kfree(afu->psl_irq_name);
	afu->psl_irq_name = NULL;
	}
	return rc;
	}

	void cxl_release_psl_irq(struct cxl_afu *afu)
	{
	cxl_unmap_irq(afu->psl_virq, afu);
	cxl_release_one_irq(afu->adapter, afu->psl_hwirq);
	kfree(afu->psl_irq_name);
	}

	void afu_irq_name_free(struct cxl_context *ctx)
	{
	struct cxl_irq_name irq_name, tmp;

	list_for_each_entry_safe(irq_name, tmp, &ctx->irq_names, list) {
	kfree(irq_name->name);
	list_del(&irq_name->list);
	kfree(irq_name);
	}
	}

	int afu_register_irqs(struct cxl_context *ctx, u32 count)
	{
	irq_hw_number_t hwirq;
	int rc, r, i, j = 1;
	struct cxl_irq_name *irq_name;

	if ((rc = cxl_alloc_irq_ranges(&ctx->irqs, ctx->afu->adapter, count)))
	return rc;

	/* Multiplexed PSL Interrupt */
	ctx->irqs.offset[0] = ctx->afu->psl_hwirq;
	ctx->irqs.range[0] = 1;

	ctx->irq_count = count;
	ctx->irq_bitmap = kcalloc(BITS_TO_LONGS(count),
	sizeof(*ctx->irq_bitmap), GFP_KERNEL);
	if (!ctx->irq_bitmap)
	return -ENOMEM;

	/*
	* Allocate names first. If any fail, bail out before allocating
	* actual hardware IRQs.
	*/
	INIT_LIST_HEAD(&ctx->irq_names);
	for (r = 1; r < CXL_IRQ_RANGES; r++) {
	for (i = 0; i < ctx->irqs.range[r]; i++) {
	irq_name = kmalloc(sizeof(struct cxl_irq_name),
	GFP_KERNEL);
	if (!irq_name)
	goto out;
	irq_name->name = kasprintf(GFP_KERNEL, "cxl-%s-pe%i-%i",
	dev_name(&ctx->afu->dev),
	ctx->pe, j);
	if (!irq_name->name) {
	kfree(irq_name);
	goto out;
	}
	/* Add to tail so next look get the correct order */
	list_add_tail(&irq_name->list, &ctx->irq_names);
	j++;
	}
	}

	/* We've allocated all memory now, so let's do the irq allocations */
	irq_name = list_first_entry(&ctx->irq_names, struct cxl_irq_name, list);
	for (r = 1; r < CXL_IRQ_RANGES; r++) {
	hwirq = ctx->irqs.offset[r];
	for (i = 0; i < ctx->irqs.range[r]; hwirq++, i++) {
	cxl_map_irq(ctx->afu->adapter, hwirq,
	cxl_irq_afu, ctx, irq_name->name);
	irq_name = list_next_entry(irq_name, list);
	}
	}

	return 0;

	out:
	afu_irq_name_free(ctx);
	return -ENOMEM;
	}

	void afu_release_irqs(struct cxl_context *ctx)
	{
	irq_hw_number_t hwirq;
	unsigned int virq;
	int r, i;

	for (r = 1; r < CXL_IRQ_RANGES; r++) {
	hwirq = ctx->irqs.offset[r];
	for (i = 0; i < ctx->irqs.range[r]; hwirq++, i++) {
	virq = irq_find_mapping(NULL, hwirq);
	if (virq)
	cxl_unmap_irq(virq, ctx);
	}
	}

	afu_irq_name_free(ctx);
	cxl_release_irq_ranges(&ctx->irqs, ctx->afu->adapter);
	}