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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:27:49 +0000
commitace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch)
treeb2d64bc10158fdd5497876388cd68142ca374ed3 /drivers/misc/ocxl
parentInitial commit. (diff)
downloadlinux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz
linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/misc/ocxl')
-rw-r--r--drivers/misc/ocxl/Kconfig31
-rw-r--r--drivers/misc/ocxl/Makefile12
-rw-r--r--drivers/misc/ocxl/afu_irq.c212
-rw-r--r--drivers/misc/ocxl/config.c937
-rw-r--r--drivers/misc/ocxl/context.c296
-rw-r--r--drivers/misc/ocxl/core.c569
-rw-r--r--drivers/misc/ocxl/file.c620
-rw-r--r--drivers/misc/ocxl/link.c779
-rw-r--r--drivers/misc/ocxl/main.c37
-rw-r--r--drivers/misc/ocxl/mmio.c234
-rw-r--r--drivers/misc/ocxl/ocxl_internal.h154
-rw-r--r--drivers/misc/ocxl/pasid.c107
-rw-r--r--drivers/misc/ocxl/pci.c66
-rw-r--r--drivers/misc/ocxl/sysfs.c186
-rw-r--r--drivers/misc/ocxl/trace.c6
-rw-r--r--drivers/misc/ocxl/trace.h242
16 files changed, 4488 insertions, 0 deletions
diff --git a/drivers/misc/ocxl/Kconfig b/drivers/misc/ocxl/Kconfig
new file mode 100644
index 0000000000..c9b0a27caf
--- /dev/null
+++ b/drivers/misc/ocxl/Kconfig
@@ -0,0 +1,31 @@
+# SPDX-License-Identifier: GPL-2.0-only
+#
+# Open Coherent Accelerator (OCXL) compatible devices
+#
+
+config OCXL_BASE
+ bool
+ select PPC_COPRO_BASE
+
+config OCXL
+ tristate "OpenCAPI coherent accelerator support"
+ depends on HOTPLUG_PCI_POWERNV
+ select OCXL_BASE
+ default m
+ help
+ Select this option to enable the ocxl driver for Open
+ Coherent Accelerator Processor Interface (OpenCAPI) devices.
+
+ OpenCAPI allows FPGA and ASIC accelerators to be coherently
+ attached to a CPU over an OpenCAPI link.
+
+ The ocxl driver enables userspace programs to access these
+ accelerators through devices in /dev/ocxl/.
+
+ For more information, see https://opencapi.org.
+
+ This is not to be confused with the support for IBM CAPI
+ accelerators (CONFIG_CXL), which are PCI-based instead of a
+ dedicated OpenCAPI link, and don't follow the same protocol.
+
+ If unsure, say N.
diff --git a/drivers/misc/ocxl/Makefile b/drivers/misc/ocxl/Makefile
new file mode 100644
index 0000000000..d07d1bb8e8
--- /dev/null
+++ b/drivers/misc/ocxl/Makefile
@@ -0,0 +1,12 @@
+# SPDX-License-Identifier: GPL-2.0+
+ccflags-$(CONFIG_PPC_WERROR) += -Werror
+
+ocxl-y += main.o pci.o config.o file.o pasid.o mmio.o
+ocxl-y += link.o context.o afu_irq.o sysfs.o trace.o
+ocxl-y += core.o
+obj-$(CONFIG_OCXL) += ocxl.o
+
+# For tracepoints to include our trace.h from tracepoint infrastructure:
+CFLAGS_trace.o := -I$(src)
+
+# ccflags-y += -DDEBUG
diff --git a/drivers/misc/ocxl/afu_irq.c b/drivers/misc/ocxl/afu_irq.c
new file mode 100644
index 0000000000..a06920b7e0
--- /dev/null
+++ b/drivers/misc/ocxl/afu_irq.c
@@ -0,0 +1,212 @@
+// SPDX-License-Identifier: GPL-2.0+
+// Copyright 2017 IBM Corp.
+#include <linux/interrupt.h>
+#include <linux/irqdomain.h>
+#include <asm/pnv-ocxl.h>
+#include <asm/xive.h>
+#include "ocxl_internal.h"
+#include "trace.h"
+
+struct afu_irq {
+ int id;
+ int hw_irq;
+ unsigned int virq;
+ char *name;
+ irqreturn_t (*handler)(void *private);
+ void (*free_private)(void *private);
+ void *private;
+};
+
+int ocxl_irq_offset_to_id(struct ocxl_context *ctx, u64 offset)
+{
+ return (offset - ctx->afu->irq_base_offset) >> PAGE_SHIFT;
+}
+
+u64 ocxl_irq_id_to_offset(struct ocxl_context *ctx, int irq_id)
+{
+ return ctx->afu->irq_base_offset + (irq_id << PAGE_SHIFT);
+}
+
+int ocxl_irq_set_handler(struct ocxl_context *ctx, int irq_id,
+ irqreturn_t (*handler)(void *private),
+ void (*free_private)(void *private),
+ void *private)
+{
+ struct afu_irq *irq;
+ int rc;
+
+ mutex_lock(&ctx->irq_lock);
+ irq = idr_find(&ctx->irq_idr, irq_id);
+ if (!irq) {
+ rc = -EINVAL;
+ goto unlock;
+ }
+
+ irq->handler = handler;
+ irq->private = private;
+ irq->free_private = free_private;
+
+ rc = 0;
+ // Fall through to unlock
+
+unlock:
+ mutex_unlock(&ctx->irq_lock);
+ return rc;
+}
+EXPORT_SYMBOL_GPL(ocxl_irq_set_handler);
+
+static irqreturn_t afu_irq_handler(int virq, void *data)
+{
+ struct afu_irq *irq = (struct afu_irq *) data;
+
+ trace_ocxl_afu_irq_receive(virq);
+
+ if (irq->handler)
+ return irq->handler(irq->private);
+
+ return IRQ_HANDLED; // Just drop it on the ground
+}
+
+static int setup_afu_irq(struct ocxl_context *ctx, struct afu_irq *irq)
+{
+ int rc;
+
+ irq->virq = irq_create_mapping(NULL, irq->hw_irq);
+ if (!irq->virq) {
+ pr_err("irq_create_mapping failed\n");
+ return -ENOMEM;
+ }
+ pr_debug("hw_irq %d mapped to virq %u\n", irq->hw_irq, irq->virq);
+
+ irq->name = kasprintf(GFP_KERNEL, "ocxl-afu-%u", irq->virq);
+ if (!irq->name) {
+ irq_dispose_mapping(irq->virq);
+ return -ENOMEM;
+ }
+
+ rc = request_irq(irq->virq, afu_irq_handler, 0, irq->name, irq);
+ if (rc) {
+ kfree(irq->name);
+ irq->name = NULL;
+ irq_dispose_mapping(irq->virq);
+ pr_err("request_irq failed: %d\n", rc);
+ return rc;
+ }
+ return 0;
+}
+
+static void release_afu_irq(struct afu_irq *irq)
+{
+ free_irq(irq->virq, irq);
+ irq_dispose_mapping(irq->virq);
+ kfree(irq->name);
+}
+
+int ocxl_afu_irq_alloc(struct ocxl_context *ctx, int *irq_id)
+{
+ struct afu_irq *irq;
+ int rc;
+
+ irq = kzalloc(sizeof(struct afu_irq), GFP_KERNEL);
+ if (!irq)
+ return -ENOMEM;
+
+ /*
+ * We limit the number of afu irqs per context and per link to
+ * avoid a single process or user depleting the pool of IPIs
+ */
+
+ mutex_lock(&ctx->irq_lock);
+
+ irq->id = idr_alloc(&ctx->irq_idr, irq, 0, MAX_IRQ_PER_CONTEXT,
+ GFP_KERNEL);
+ if (irq->id < 0) {
+ rc = -ENOSPC;
+ goto err_unlock;
+ }
+
+ rc = ocxl_link_irq_alloc(ctx->afu->fn->link, &irq->hw_irq);
+ if (rc)
+ goto err_idr;
+
+ rc = setup_afu_irq(ctx, irq);
+ if (rc)
+ goto err_alloc;
+
+ trace_ocxl_afu_irq_alloc(ctx->pasid, irq->id, irq->virq, irq->hw_irq);
+ mutex_unlock(&ctx->irq_lock);
+
+ *irq_id = irq->id;
+
+ return 0;
+
+err_alloc:
+ ocxl_link_free_irq(ctx->afu->fn->link, irq->hw_irq);
+err_idr:
+ idr_remove(&ctx->irq_idr, irq->id);
+err_unlock:
+ mutex_unlock(&ctx->irq_lock);
+ kfree(irq);
+ return rc;
+}
+EXPORT_SYMBOL_GPL(ocxl_afu_irq_alloc);
+
+static void afu_irq_free(struct afu_irq *irq, struct ocxl_context *ctx)
+{
+ trace_ocxl_afu_irq_free(ctx->pasid, irq->id);
+ if (ctx->mapping)
+ unmap_mapping_range(ctx->mapping,
+ ocxl_irq_id_to_offset(ctx, irq->id),
+ 1 << PAGE_SHIFT, 1);
+ release_afu_irq(irq);
+ if (irq->free_private)
+ irq->free_private(irq->private);
+ ocxl_link_free_irq(ctx->afu->fn->link, irq->hw_irq);
+ kfree(irq);
+}
+
+int ocxl_afu_irq_free(struct ocxl_context *ctx, int irq_id)
+{
+ struct afu_irq *irq;
+
+ mutex_lock(&ctx->irq_lock);
+
+ irq = idr_find(&ctx->irq_idr, irq_id);
+ if (!irq) {
+ mutex_unlock(&ctx->irq_lock);
+ return -EINVAL;
+ }
+ idr_remove(&ctx->irq_idr, irq->id);
+ afu_irq_free(irq, ctx);
+ mutex_unlock(&ctx->irq_lock);
+ return 0;
+}
+EXPORT_SYMBOL_GPL(ocxl_afu_irq_free);
+
+void ocxl_afu_irq_free_all(struct ocxl_context *ctx)
+{
+ struct afu_irq *irq;
+ int id;
+
+ mutex_lock(&ctx->irq_lock);
+ idr_for_each_entry(&ctx->irq_idr, irq, id)
+ afu_irq_free(irq, ctx);
+ mutex_unlock(&ctx->irq_lock);
+}
+
+u64 ocxl_afu_irq_get_addr(struct ocxl_context *ctx, int irq_id)
+{
+ struct xive_irq_data *xd;
+ struct afu_irq *irq;
+ u64 addr = 0;
+
+ mutex_lock(&ctx->irq_lock);
+ irq = idr_find(&ctx->irq_idr, irq_id);
+ if (irq) {
+ xd = irq_get_handler_data(irq->virq);
+ addr = xd ? xd->trig_page : 0;
+ }
+ mutex_unlock(&ctx->irq_lock);
+ return addr;
+}
+EXPORT_SYMBOL_GPL(ocxl_afu_irq_get_addr);
diff --git a/drivers/misc/ocxl/config.c b/drivers/misc/ocxl/config.c
new file mode 100644
index 0000000000..92ab49705f
--- /dev/null
+++ b/drivers/misc/ocxl/config.c
@@ -0,0 +1,937 @@
+// SPDX-License-Identifier: GPL-2.0+
+// Copyright 2017 IBM Corp.
+#include <linux/pci.h>
+#include <asm/pnv-ocxl.h>
+#include <misc/ocxl-config.h>
+#include "ocxl_internal.h"
+
+#define EXTRACT_BIT(val, bit) (!!(val & BIT(bit)))
+#define EXTRACT_BITS(val, s, e) ((val & GENMASK(e, s)) >> s)
+
+#define OCXL_DVSEC_AFU_IDX_MASK GENMASK(5, 0)
+#define OCXL_DVSEC_ACTAG_MASK GENMASK(11, 0)
+#define OCXL_DVSEC_PASID_MASK GENMASK(19, 0)
+#define OCXL_DVSEC_PASID_LOG_MASK GENMASK(4, 0)
+
+#define OCXL_DVSEC_TEMPL_VERSION 0x0
+#define OCXL_DVSEC_TEMPL_NAME 0x4
+#define OCXL_DVSEC_TEMPL_AFU_VERSION 0x1C
+#define OCXL_DVSEC_TEMPL_MMIO_GLOBAL 0x20
+#define OCXL_DVSEC_TEMPL_MMIO_GLOBAL_SZ 0x28
+#define OCXL_DVSEC_TEMPL_MMIO_PP 0x30
+#define OCXL_DVSEC_TEMPL_MMIO_PP_SZ 0x38
+#define OCXL_DVSEC_TEMPL_ALL_MEM_SZ 0x3C
+#define OCXL_DVSEC_TEMPL_LPC_MEM_START 0x40
+#define OCXL_DVSEC_TEMPL_WWID 0x48
+#define OCXL_DVSEC_TEMPL_LPC_MEM_SZ 0x58
+
+#define OCXL_MAX_AFU_PER_FUNCTION 64
+#define OCXL_TEMPL_LEN_1_0 0x58
+#define OCXL_TEMPL_LEN_1_1 0x60
+#define OCXL_TEMPL_NAME_LEN 24
+#define OCXL_CFG_TIMEOUT 3
+
+static int find_dvsec(struct pci_dev *dev, int dvsec_id)
+{
+ return pci_find_dvsec_capability(dev, PCI_VENDOR_ID_IBM, dvsec_id);
+}
+
+static int find_dvsec_afu_ctrl(struct pci_dev *dev, u8 afu_idx)
+{
+ int vsec = 0;
+ u16 vendor, id;
+ u8 idx;
+
+ while ((vsec = pci_find_next_ext_capability(dev, vsec,
+ OCXL_EXT_CAP_ID_DVSEC))) {
+ pci_read_config_word(dev, vsec + OCXL_DVSEC_VENDOR_OFFSET,
+ &vendor);
+ pci_read_config_word(dev, vsec + OCXL_DVSEC_ID_OFFSET, &id);
+
+ if (vendor == PCI_VENDOR_ID_IBM &&
+ id == OCXL_DVSEC_AFU_CTRL_ID) {
+ pci_read_config_byte(dev,
+ vsec + OCXL_DVSEC_AFU_CTRL_AFU_IDX,
+ &idx);
+ if (idx == afu_idx)
+ return vsec;
+ }
+ }
+ return 0;
+}
+
+/**
+ * get_function_0() - Find a related PCI device (function 0)
+ * @dev: PCI device to match
+ *
+ * Returns a pointer to the related device, or null if not found
+ */
+static struct pci_dev *get_function_0(struct pci_dev *dev)
+{
+ unsigned int devfn = PCI_DEVFN(PCI_SLOT(dev->devfn), 0);
+
+ return pci_get_domain_bus_and_slot(pci_domain_nr(dev->bus),
+ dev->bus->number, devfn);
+}
+
+static void read_pasid(struct pci_dev *dev, struct ocxl_fn_config *fn)
+{
+ u16 val;
+ int pos;
+
+ pos = pci_find_ext_capability(dev, PCI_EXT_CAP_ID_PASID);
+ if (!pos) {
+ /*
+ * PASID capability is not mandatory, but there
+ * shouldn't be any AFU
+ */
+ dev_dbg(&dev->dev, "Function doesn't require any PASID\n");
+ fn->max_pasid_log = -1;
+ goto out;
+ }
+ pci_read_config_word(dev, pos + PCI_PASID_CAP, &val);
+ fn->max_pasid_log = EXTRACT_BITS(val, 8, 12);
+
+out:
+ dev_dbg(&dev->dev, "PASID capability:\n");
+ dev_dbg(&dev->dev, " Max PASID log = %d\n", fn->max_pasid_log);
+}
+
+static int read_dvsec_tl(struct pci_dev *dev, struct ocxl_fn_config *fn)
+{
+ int pos;
+
+ pos = find_dvsec(dev, OCXL_DVSEC_TL_ID);
+ if (!pos && PCI_FUNC(dev->devfn) == 0) {
+ dev_err(&dev->dev, "Can't find TL DVSEC\n");
+ return -ENODEV;
+ }
+ if (pos && PCI_FUNC(dev->devfn) != 0) {
+ dev_err(&dev->dev, "TL DVSEC is only allowed on function 0\n");
+ return -ENODEV;
+ }
+ fn->dvsec_tl_pos = pos;
+ return 0;
+}
+
+static int read_dvsec_function(struct pci_dev *dev, struct ocxl_fn_config *fn)
+{
+ int pos, afu_present;
+ u32 val;
+
+ pos = find_dvsec(dev, OCXL_DVSEC_FUNC_ID);
+ if (!pos) {
+ dev_err(&dev->dev, "Can't find function DVSEC\n");
+ return -ENODEV;
+ }
+ fn->dvsec_function_pos = pos;
+
+ pci_read_config_dword(dev, pos + OCXL_DVSEC_FUNC_OFF_INDEX, &val);
+ afu_present = EXTRACT_BIT(val, 31);
+ if (!afu_present) {
+ fn->max_afu_index = -1;
+ dev_dbg(&dev->dev, "Function doesn't define any AFU\n");
+ goto out;
+ }
+ fn->max_afu_index = EXTRACT_BITS(val, 24, 29);
+
+out:
+ dev_dbg(&dev->dev, "Function DVSEC:\n");
+ dev_dbg(&dev->dev, " Max AFU index = %d\n", fn->max_afu_index);
+ return 0;
+}
+
+static int read_dvsec_afu_info(struct pci_dev *dev, struct ocxl_fn_config *fn)
+{
+ int pos;
+
+ if (fn->max_afu_index < 0) {
+ fn->dvsec_afu_info_pos = -1;
+ return 0;
+ }
+
+ pos = find_dvsec(dev, OCXL_DVSEC_AFU_INFO_ID);
+ if (!pos) {
+ dev_err(&dev->dev, "Can't find AFU information DVSEC\n");
+ return -ENODEV;
+ }
+ fn->dvsec_afu_info_pos = pos;
+ return 0;
+}
+
+static int read_dvsec_vendor(struct pci_dev *dev)
+{
+ int pos;
+ u32 cfg, tlx, dlx, reset_reload;
+
+ /*
+ * vendor specific DVSEC, for IBM images only. Some older
+ * images may not have it
+ *
+ * It's only used on function 0 to specify the version of some
+ * logic blocks and to give access to special registers to
+ * enable host-based flashing.
+ */
+ if (PCI_FUNC(dev->devfn) != 0)
+ return 0;
+
+ pos = find_dvsec(dev, OCXL_DVSEC_VENDOR_ID);
+ if (!pos)
+ return 0;
+
+ pci_read_config_dword(dev, pos + OCXL_DVSEC_VENDOR_CFG_VERS, &cfg);
+ pci_read_config_dword(dev, pos + OCXL_DVSEC_VENDOR_TLX_VERS, &tlx);
+ pci_read_config_dword(dev, pos + OCXL_DVSEC_VENDOR_DLX_VERS, &dlx);
+ pci_read_config_dword(dev, pos + OCXL_DVSEC_VENDOR_RESET_RELOAD,
+ &reset_reload);
+
+ dev_dbg(&dev->dev, "Vendor specific DVSEC:\n");
+ dev_dbg(&dev->dev, " CFG version = 0x%x\n", cfg);
+ dev_dbg(&dev->dev, " TLX version = 0x%x\n", tlx);
+ dev_dbg(&dev->dev, " DLX version = 0x%x\n", dlx);
+ dev_dbg(&dev->dev, " ResetReload = 0x%x\n", reset_reload);
+ return 0;
+}
+
+/**
+ * get_dvsec_vendor0() - Find a related PCI device (function 0)
+ * @dev: PCI device to match
+ * @dev0: The PCI device (function 0) found
+ * @out_pos: The position of PCI device (function 0)
+ *
+ * Returns 0 on success, negative on failure.
+ *
+ * NOTE: If it's successful, the reference of dev0 is increased,
+ * so after using it, the callers must call pci_dev_put() to give
+ * up the reference.
+ */
+static int get_dvsec_vendor0(struct pci_dev *dev, struct pci_dev **dev0,
+ int *out_pos)
+{
+ int pos;
+
+ if (PCI_FUNC(dev->devfn) != 0) {
+ dev = get_function_0(dev);
+ if (!dev)
+ return -1;
+ } else {
+ dev = pci_dev_get(dev);
+ }
+ pos = find_dvsec(dev, OCXL_DVSEC_VENDOR_ID);
+ if (!pos) {
+ pci_dev_put(dev);
+ return -1;
+ }
+ *dev0 = dev;
+ *out_pos = pos;
+ return 0;
+}
+
+int ocxl_config_get_reset_reload(struct pci_dev *dev, int *val)
+{
+ struct pci_dev *dev0;
+ u32 reset_reload;
+ int pos;
+
+ if (get_dvsec_vendor0(dev, &dev0, &pos))
+ return -1;
+
+ pci_read_config_dword(dev0, pos + OCXL_DVSEC_VENDOR_RESET_RELOAD,
+ &reset_reload);
+ pci_dev_put(dev0);
+ *val = !!(reset_reload & BIT(0));
+ return 0;
+}
+
+int ocxl_config_set_reset_reload(struct pci_dev *dev, int val)
+{
+ struct pci_dev *dev0;
+ u32 reset_reload;
+ int pos;
+
+ if (get_dvsec_vendor0(dev, &dev0, &pos))
+ return -1;
+
+ pci_read_config_dword(dev0, pos + OCXL_DVSEC_VENDOR_RESET_RELOAD,
+ &reset_reload);
+ if (val)
+ reset_reload |= BIT(0);
+ else
+ reset_reload &= ~BIT(0);
+ pci_write_config_dword(dev0, pos + OCXL_DVSEC_VENDOR_RESET_RELOAD,
+ reset_reload);
+ pci_dev_put(dev0);
+ return 0;
+}
+
+static int validate_function(struct pci_dev *dev, struct ocxl_fn_config *fn)
+{
+ if (fn->max_pasid_log == -1 && fn->max_afu_index >= 0) {
+ dev_err(&dev->dev,
+ "AFUs are defined but no PASIDs are requested\n");
+ return -EINVAL;
+ }
+
+ if (fn->max_afu_index > OCXL_MAX_AFU_PER_FUNCTION) {
+ dev_err(&dev->dev,
+ "Max AFU index out of architectural limit (%d vs %d)\n",
+ fn->max_afu_index, OCXL_MAX_AFU_PER_FUNCTION);
+ return -EINVAL;
+ }
+ return 0;
+}
+
+int ocxl_config_read_function(struct pci_dev *dev, struct ocxl_fn_config *fn)
+{
+ int rc;
+
+ read_pasid(dev, fn);
+
+ rc = read_dvsec_tl(dev, fn);
+ if (rc) {
+ dev_err(&dev->dev,
+ "Invalid Transaction Layer DVSEC configuration: %d\n",
+ rc);
+ return -ENODEV;
+ }
+
+ rc = read_dvsec_function(dev, fn);
+ if (rc) {
+ dev_err(&dev->dev,
+ "Invalid Function DVSEC configuration: %d\n", rc);
+ return -ENODEV;
+ }
+
+ rc = read_dvsec_afu_info(dev, fn);
+ if (rc) {
+ dev_err(&dev->dev, "Invalid AFU configuration: %d\n", rc);
+ return -ENODEV;
+ }
+
+ rc = read_dvsec_vendor(dev);
+ if (rc) {
+ dev_err(&dev->dev,
+ "Invalid vendor specific DVSEC configuration: %d\n",
+ rc);
+ return -ENODEV;
+ }
+
+ rc = validate_function(dev, fn);
+ return rc;
+}
+EXPORT_SYMBOL_GPL(ocxl_config_read_function);
+
+static int read_afu_info(struct pci_dev *dev, struct ocxl_fn_config *fn,
+ int offset, u32 *data)
+{
+ u32 val;
+ unsigned long timeout = jiffies + (HZ * OCXL_CFG_TIMEOUT);
+ int pos = fn->dvsec_afu_info_pos;
+
+ /* Protect 'data valid' bit */
+ if (EXTRACT_BIT(offset, 31)) {
+ dev_err(&dev->dev, "Invalid offset in AFU info DVSEC\n");
+ return -EINVAL;
+ }
+
+ pci_write_config_dword(dev, pos + OCXL_DVSEC_AFU_INFO_OFF, offset);
+ pci_read_config_dword(dev, pos + OCXL_DVSEC_AFU_INFO_OFF, &val);
+ while (!EXTRACT_BIT(val, 31)) {
+ if (time_after_eq(jiffies, timeout)) {
+ dev_err(&dev->dev,
+ "Timeout while reading AFU info DVSEC (offset=%d)\n",
+ offset);
+ return -EBUSY;
+ }
+ cpu_relax();
+ pci_read_config_dword(dev, pos + OCXL_DVSEC_AFU_INFO_OFF, &val);
+ }
+ pci_read_config_dword(dev, pos + OCXL_DVSEC_AFU_INFO_DATA, data);
+ return 0;
+}
+
+/**
+ * read_template_version() - Read the template version from the AFU
+ * @dev: the device for the AFU
+ * @fn: the AFU offsets
+ * @len: outputs the template length
+ * @version: outputs the major<<8,minor version
+ *
+ * Returns 0 on success, negative on failure
+ */
+static int read_template_version(struct pci_dev *dev, struct ocxl_fn_config *fn,
+ u16 *len, u16 *version)
+{
+ u32 val32;
+ u8 major, minor;
+ int rc;
+
+ rc = read_afu_info(dev, fn, OCXL_DVSEC_TEMPL_VERSION, &val32);
+ if (rc)
+ return rc;
+
+ *len = EXTRACT_BITS(val32, 16, 31);
+ major = EXTRACT_BITS(val32, 8, 15);
+ minor = EXTRACT_BITS(val32, 0, 7);
+ *version = (major << 8) + minor;
+ return 0;
+}
+
+int ocxl_config_check_afu_index(struct pci_dev *dev,
+ struct ocxl_fn_config *fn, int afu_idx)
+{
+ int rc;
+ u16 templ_version;
+ u16 len, expected_len;
+
+ pci_write_config_byte(dev,
+ fn->dvsec_afu_info_pos + OCXL_DVSEC_AFU_INFO_AFU_IDX,
+ afu_idx);
+
+ rc = read_template_version(dev, fn, &len, &templ_version);
+ if (rc)
+ return rc;
+
+ /* AFU index map can have holes, in which case we read all 0's */
+ if (!templ_version && !len)
+ return 0;
+
+ dev_dbg(&dev->dev, "AFU descriptor template version %d.%d\n",
+ templ_version >> 8, templ_version & 0xFF);
+
+ switch (templ_version) {
+ case 0x0005: // v0.5 was used prior to the spec approval
+ case 0x0100:
+ expected_len = OCXL_TEMPL_LEN_1_0;
+ break;
+ case 0x0101:
+ expected_len = OCXL_TEMPL_LEN_1_1;
+ break;
+ default:
+ dev_warn(&dev->dev, "Unknown AFU template version %#x\n",
+ templ_version);
+ expected_len = len;
+ }
+ if (len != expected_len)
+ dev_warn(&dev->dev,
+ "Unexpected template length %#x in AFU information, expected %#x for version %#x\n",
+ len, expected_len, templ_version);
+ return 1;
+}
+
+static int read_afu_name(struct pci_dev *dev, struct ocxl_fn_config *fn,
+ struct ocxl_afu_config *afu)
+{
+ int i, rc;
+ u32 val, *ptr;
+
+ BUILD_BUG_ON(OCXL_AFU_NAME_SZ < OCXL_TEMPL_NAME_LEN);
+ for (i = 0; i < OCXL_TEMPL_NAME_LEN; i += 4) {
+ rc = read_afu_info(dev, fn, OCXL_DVSEC_TEMPL_NAME + i, &val);
+ if (rc)
+ return rc;
+ ptr = (u32 *) &afu->name[i];
+ *ptr = le32_to_cpu((__force __le32) val);
+ }
+ afu->name[OCXL_AFU_NAME_SZ - 1] = '\0'; /* play safe */
+ return 0;
+}
+
+static int read_afu_mmio(struct pci_dev *dev, struct ocxl_fn_config *fn,
+ struct ocxl_afu_config *afu)
+{
+ int rc;
+ u32 val;
+
+ /*
+ * Global MMIO
+ */
+ rc = read_afu_info(dev, fn, OCXL_DVSEC_TEMPL_MMIO_GLOBAL, &val);
+ if (rc)
+ return rc;
+ afu->global_mmio_bar = EXTRACT_BITS(val, 0, 2);
+ afu->global_mmio_offset = EXTRACT_BITS(val, 16, 31) << 16;
+
+ rc = read_afu_info(dev, fn, OCXL_DVSEC_TEMPL_MMIO_GLOBAL + 4, &val);
+ if (rc)
+ return rc;
+ afu->global_mmio_offset += (u64) val << 32;
+
+ rc = read_afu_info(dev, fn, OCXL_DVSEC_TEMPL_MMIO_GLOBAL_SZ, &val);
+ if (rc)
+ return rc;
+ afu->global_mmio_size = val;
+
+ /*
+ * Per-process MMIO
+ */
+ rc = read_afu_info(dev, fn, OCXL_DVSEC_TEMPL_MMIO_PP, &val);
+ if (rc)
+ return rc;
+ afu->pp_mmio_bar = EXTRACT_BITS(val, 0, 2);
+ afu->pp_mmio_offset = EXTRACT_BITS(val, 16, 31) << 16;
+
+ rc = read_afu_info(dev, fn, OCXL_DVSEC_TEMPL_MMIO_PP + 4, &val);
+ if (rc)
+ return rc;
+ afu->pp_mmio_offset += (u64) val << 32;
+
+ rc = read_afu_info(dev, fn, OCXL_DVSEC_TEMPL_MMIO_PP_SZ, &val);
+ if (rc)
+ return rc;
+ afu->pp_mmio_stride = val;
+
+ return 0;
+}
+
+static int read_afu_control(struct pci_dev *dev, struct ocxl_afu_config *afu)
+{
+ int pos;
+ u8 val8;
+ u16 val16;
+
+ pos = find_dvsec_afu_ctrl(dev, afu->idx);
+ if (!pos) {
+ dev_err(&dev->dev, "Can't find AFU control DVSEC for AFU %d\n",
+ afu->idx);
+ return -ENODEV;
+ }
+ afu->dvsec_afu_control_pos = pos;
+
+ pci_read_config_byte(dev, pos + OCXL_DVSEC_AFU_CTRL_PASID_SUP, &val8);
+ afu->pasid_supported_log = EXTRACT_BITS(val8, 0, 4);
+
+ pci_read_config_word(dev, pos + OCXL_DVSEC_AFU_CTRL_ACTAG_SUP, &val16);
+ afu->actag_supported = EXTRACT_BITS(val16, 0, 11);
+ return 0;
+}
+
+static bool char_allowed(int c)
+{
+ /*
+ * Permitted Characters : Alphanumeric, hyphen, underscore, comma
+ */
+ if ((c >= 0x30 && c <= 0x39) /* digits */ ||
+ (c >= 0x41 && c <= 0x5A) /* upper case */ ||
+ (c >= 0x61 && c <= 0x7A) /* lower case */ ||
+ c == 0 /* NULL */ ||
+ c == 0x2D /* - */ ||
+ c == 0x5F /* _ */ ||
+ c == 0x2C /* , */)
+ return true;
+ return false;
+}
+
+static int validate_afu(struct pci_dev *dev, struct ocxl_afu_config *afu)
+{
+ int i;
+
+ if (!afu->name[0]) {
+ dev_err(&dev->dev, "Empty AFU name\n");
+ return -EINVAL;
+ }
+ for (i = 0; i < OCXL_TEMPL_NAME_LEN; i++) {
+ if (!char_allowed(afu->name[i])) {
+ dev_err(&dev->dev,
+ "Invalid character in AFU name\n");
+ return -EINVAL;
+ }
+ }
+
+ if (afu->global_mmio_bar != 0 &&
+ afu->global_mmio_bar != 2 &&
+ afu->global_mmio_bar != 4) {
+ dev_err(&dev->dev, "Invalid global MMIO bar number\n");
+ return -EINVAL;
+ }
+ if (afu->pp_mmio_bar != 0 &&
+ afu->pp_mmio_bar != 2 &&
+ afu->pp_mmio_bar != 4) {
+ dev_err(&dev->dev, "Invalid per-process MMIO bar number\n");
+ return -EINVAL;
+ }
+ return 0;
+}
+
+/**
+ * read_afu_lpc_memory_info() - Populate AFU metadata regarding LPC memory
+ * @dev: the device for the AFU
+ * @fn: the AFU offsets
+ * @afu: the AFU struct to populate the LPC metadata into
+ *
+ * Returns 0 on success, negative on failure
+ */
+static int read_afu_lpc_memory_info(struct pci_dev *dev,
+ struct ocxl_fn_config *fn,
+ struct ocxl_afu_config *afu)
+{
+ int rc;
+ u32 val32;
+ u16 templ_version;
+ u16 templ_len;
+ u64 total_mem_size = 0;
+ u64 lpc_mem_size = 0;
+
+ afu->lpc_mem_offset = 0;
+ afu->lpc_mem_size = 0;
+ afu->special_purpose_mem_offset = 0;
+ afu->special_purpose_mem_size = 0;
+ /*
+ * For AFUs following template v1.0, the LPC memory covers the
+ * total memory. Its size is a power of 2.
+ *
+ * For AFUs with template >= v1.01, the total memory size is
+ * still a power of 2, but it is split in 2 parts:
+ * - the LPC memory, whose size can now be anything
+ * - the remainder memory is a special purpose memory, whose
+ * definition is AFU-dependent. It is not accessible through
+ * the usual commands for LPC memory
+ */
+ rc = read_afu_info(dev, fn, OCXL_DVSEC_TEMPL_ALL_MEM_SZ, &val32);
+ if (rc)
+ return rc;
+
+ val32 = EXTRACT_BITS(val32, 0, 7);
+ if (!val32)
+ return 0; /* No LPC memory */
+
+ /*
+ * The configuration space spec allows for a memory size of up
+ * to 2^255 bytes.
+ *
+ * Current generation hardware uses 56-bit physical addresses,
+ * but we won't be able to get near close to that, as we won't
+ * have a hole big enough in the memory map. Let it pass in
+ * the driver for now. We'll get an error from the firmware
+ * when trying to configure something too big.
+ */
+ total_mem_size = 1ull << val32;
+
+ rc = read_afu_info(dev, fn, OCXL_DVSEC_TEMPL_LPC_MEM_START, &val32);
+ if (rc)
+ return rc;
+
+ afu->lpc_mem_offset = val32;
+
+ rc = read_afu_info(dev, fn, OCXL_DVSEC_TEMPL_LPC_MEM_START + 4, &val32);
+ if (rc)
+ return rc;
+
+ afu->lpc_mem_offset |= (u64) val32 << 32;
+
+ rc = read_template_version(dev, fn, &templ_len, &templ_version);
+ if (rc)
+ return rc;
+
+ if (templ_version >= 0x0101) {
+ rc = read_afu_info(dev, fn,
+ OCXL_DVSEC_TEMPL_LPC_MEM_SZ, &val32);
+ if (rc)
+ return rc;
+ lpc_mem_size = val32;
+
+ rc = read_afu_info(dev, fn,
+ OCXL_DVSEC_TEMPL_LPC_MEM_SZ + 4, &val32);
+ if (rc)
+ return rc;
+ lpc_mem_size |= (u64) val32 << 32;
+ } else {
+ lpc_mem_size = total_mem_size;
+ }
+ afu->lpc_mem_size = lpc_mem_size;
+
+ if (lpc_mem_size < total_mem_size) {
+ afu->special_purpose_mem_offset =
+ afu->lpc_mem_offset + lpc_mem_size;
+ afu->special_purpose_mem_size =
+ total_mem_size - lpc_mem_size;
+ }
+ return 0;
+}
+
+int ocxl_config_read_afu(struct pci_dev *dev, struct ocxl_fn_config *fn,
+ struct ocxl_afu_config *afu, u8 afu_idx)
+{
+ int rc;
+ u32 val32;
+
+ /*
+ * First, we need to write the AFU idx for the AFU we want to
+ * access.
+ */
+ WARN_ON((afu_idx & OCXL_DVSEC_AFU_IDX_MASK) != afu_idx);
+ afu->idx = afu_idx;
+ pci_write_config_byte(dev,
+ fn->dvsec_afu_info_pos + OCXL_DVSEC_AFU_INFO_AFU_IDX,
+ afu->idx);
+
+ rc = read_afu_name(dev, fn, afu);
+ if (rc)
+ return rc;
+
+ rc = read_afu_info(dev, fn, OCXL_DVSEC_TEMPL_AFU_VERSION, &val32);
+ if (rc)
+ return rc;
+ afu->version_major = EXTRACT_BITS(val32, 24, 31);
+ afu->version_minor = EXTRACT_BITS(val32, 16, 23);
+ afu->afuc_type = EXTRACT_BITS(val32, 14, 15);
+ afu->afum_type = EXTRACT_BITS(val32, 12, 13);
+ afu->profile = EXTRACT_BITS(val32, 0, 7);
+
+ rc = read_afu_mmio(dev, fn, afu);
+ if (rc)
+ return rc;
+
+ rc = read_afu_lpc_memory_info(dev, fn, afu);
+ if (rc)
+ return rc;
+
+ rc = read_afu_control(dev, afu);
+ if (rc)
+ return rc;
+
+ dev_dbg(&dev->dev, "AFU configuration:\n");
+ dev_dbg(&dev->dev, " name = %s\n", afu->name);
+ dev_dbg(&dev->dev, " version = %d.%d\n", afu->version_major,
+ afu->version_minor);
+ dev_dbg(&dev->dev, " global mmio bar = %hhu\n", afu->global_mmio_bar);
+ dev_dbg(&dev->dev, " global mmio offset = %#llx\n",
+ afu->global_mmio_offset);
+ dev_dbg(&dev->dev, " global mmio size = %#x\n", afu->global_mmio_size);
+ dev_dbg(&dev->dev, " pp mmio bar = %hhu\n", afu->pp_mmio_bar);
+ dev_dbg(&dev->dev, " pp mmio offset = %#llx\n", afu->pp_mmio_offset);
+ dev_dbg(&dev->dev, " pp mmio stride = %#x\n", afu->pp_mmio_stride);
+ dev_dbg(&dev->dev, " lpc_mem offset = %#llx\n", afu->lpc_mem_offset);
+ dev_dbg(&dev->dev, " lpc_mem size = %#llx\n", afu->lpc_mem_size);
+ dev_dbg(&dev->dev, " special purpose mem offset = %#llx\n",
+ afu->special_purpose_mem_offset);
+ dev_dbg(&dev->dev, " special purpose mem size = %#llx\n",
+ afu->special_purpose_mem_size);
+ dev_dbg(&dev->dev, " pasid supported (log) = %u\n",
+ afu->pasid_supported_log);
+ dev_dbg(&dev->dev, " actag supported = %u\n",
+ afu->actag_supported);
+
+ rc = validate_afu(dev, afu);
+ return rc;
+}
+EXPORT_SYMBOL_GPL(ocxl_config_read_afu);
+
+int ocxl_config_get_actag_info(struct pci_dev *dev, u16 *base, u16 *enabled,
+ u16 *supported)
+{
+ int rc;
+
+ /*
+ * This is really a simple wrapper for the kernel API, to
+ * avoid an external driver using ocxl as a library to call
+ * platform-dependent code
+ */
+ rc = pnv_ocxl_get_actag(dev, base, enabled, supported);
+ if (rc) {
+ dev_err(&dev->dev, "Can't get actag for device: %d\n", rc);
+ return rc;
+ }
+ return 0;
+}
+EXPORT_SYMBOL_GPL(ocxl_config_get_actag_info);
+
+void ocxl_config_set_afu_actag(struct pci_dev *dev, int pos, int actag_base,
+ int actag_count)
+{
+ u16 val;
+
+ val = actag_count & OCXL_DVSEC_ACTAG_MASK;
+ pci_write_config_byte(dev, pos + OCXL_DVSEC_AFU_CTRL_ACTAG_EN, val);
+
+ val = actag_base & OCXL_DVSEC_ACTAG_MASK;
+ pci_write_config_dword(dev, pos + OCXL_DVSEC_AFU_CTRL_ACTAG_BASE, val);
+}
+EXPORT_SYMBOL_GPL(ocxl_config_set_afu_actag);
+
+int ocxl_config_get_pasid_info(struct pci_dev *dev, int *count)
+{
+ return pnv_ocxl_get_pasid_count(dev, count);
+}
+
+void ocxl_config_set_afu_pasid(struct pci_dev *dev, int pos, int pasid_base,
+ u32 pasid_count_log)
+{
+ u8 val8;
+ u32 val32;
+
+ val8 = pasid_count_log & OCXL_DVSEC_PASID_LOG_MASK;
+ pci_write_config_byte(dev, pos + OCXL_DVSEC_AFU_CTRL_PASID_EN, val8);
+
+ pci_read_config_dword(dev, pos + OCXL_DVSEC_AFU_CTRL_PASID_BASE,
+ &val32);
+ val32 &= ~OCXL_DVSEC_PASID_MASK;
+ val32 |= pasid_base & OCXL_DVSEC_PASID_MASK;
+ pci_write_config_dword(dev, pos + OCXL_DVSEC_AFU_CTRL_PASID_BASE,
+ val32);
+}
+EXPORT_SYMBOL_GPL(ocxl_config_set_afu_pasid);
+
+void ocxl_config_set_afu_state(struct pci_dev *dev, int pos, int enable)
+{
+ u8 val;
+
+ pci_read_config_byte(dev, pos + OCXL_DVSEC_AFU_CTRL_ENABLE, &val);
+ if (enable)
+ val |= 1;
+ else
+ val &= 0xFE;
+ pci_write_config_byte(dev, pos + OCXL_DVSEC_AFU_CTRL_ENABLE, val);
+}
+EXPORT_SYMBOL_GPL(ocxl_config_set_afu_state);
+
+int ocxl_config_set_TL(struct pci_dev *dev, int tl_dvsec)
+{
+ u32 val;
+ __be32 *be32ptr;
+ u8 timers;
+ int i, rc;
+ long recv_cap;
+ char *recv_rate;
+
+ /*
+ * Skip on function != 0, as the TL can only be defined on 0
+ */
+ if (PCI_FUNC(dev->devfn) != 0)
+ return 0;
+
+ recv_rate = kzalloc(PNV_OCXL_TL_RATE_BUF_SIZE, GFP_KERNEL);
+ if (!recv_rate)
+ return -ENOMEM;
+ /*
+ * The spec defines 64 templates for messages in the
+ * Transaction Layer (TL).
+ *
+ * The host and device each support a subset, so we need to
+ * configure the transmitters on each side to send only
+ * templates the receiver understands, at a rate the receiver
+ * can process. Per the spec, template 0 must be supported by
+ * everybody. That's the template which has been used by the
+ * host and device so far.
+ *
+ * The sending rate limit must be set before the template is
+ * enabled.
+ */
+
+ /*
+ * Device -> host
+ */
+ rc = pnv_ocxl_get_tl_cap(dev, &recv_cap, recv_rate,
+ PNV_OCXL_TL_RATE_BUF_SIZE);
+ if (rc)
+ goto out;
+
+ for (i = 0; i < PNV_OCXL_TL_RATE_BUF_SIZE; i += 4) {
+ be32ptr = (__be32 *) &recv_rate[i];
+ pci_write_config_dword(dev,
+ tl_dvsec + OCXL_DVSEC_TL_SEND_RATE + i,
+ be32_to_cpu(*be32ptr));
+ }
+ val = recv_cap >> 32;
+ pci_write_config_dword(dev, tl_dvsec + OCXL_DVSEC_TL_SEND_CAP, val);
+ val = recv_cap & GENMASK(31, 0);
+ pci_write_config_dword(dev, tl_dvsec + OCXL_DVSEC_TL_SEND_CAP + 4, val);
+
+ /*
+ * Host -> device
+ */
+ for (i = 0; i < PNV_OCXL_TL_RATE_BUF_SIZE; i += 4) {
+ pci_read_config_dword(dev,
+ tl_dvsec + OCXL_DVSEC_TL_RECV_RATE + i,
+ &val);
+ be32ptr = (__be32 *) &recv_rate[i];
+ *be32ptr = cpu_to_be32(val);
+ }
+ pci_read_config_dword(dev, tl_dvsec + OCXL_DVSEC_TL_RECV_CAP, &val);
+ recv_cap = (long) val << 32;
+ pci_read_config_dword(dev, tl_dvsec + OCXL_DVSEC_TL_RECV_CAP + 4, &val);
+ recv_cap |= val;
+
+ rc = pnv_ocxl_set_tl_conf(dev, recv_cap, __pa(recv_rate),
+ PNV_OCXL_TL_RATE_BUF_SIZE);
+ if (rc)
+ goto out;
+
+ /*
+ * Opencapi commands needing to be retried are classified per
+ * the TL in 2 groups: short and long commands.
+ *
+ * The short back off timer it not used for now. It will be
+ * for opencapi 4.0.
+ *
+ * The long back off timer is typically used when an AFU hits
+ * a page fault but the NPU is already processing one. So the
+ * AFU needs to wait before it can resubmit. Having a value
+ * too low doesn't break anything, but can generate extra
+ * traffic on the link.
+ * We set it to 1.6 us for now. It's shorter than, but in the
+ * same order of magnitude as the time spent to process a page
+ * fault.
+ */
+ timers = 0x2 << 4; /* long timer = 1.6 us */
+ pci_write_config_byte(dev, tl_dvsec + OCXL_DVSEC_TL_BACKOFF_TIMERS,
+ timers);
+
+ rc = 0;
+out:
+ kfree(recv_rate);
+ return rc;
+}
+EXPORT_SYMBOL_GPL(ocxl_config_set_TL);
+
+int ocxl_config_terminate_pasid(struct pci_dev *dev, int afu_control, int pasid)
+{
+ u32 val;
+ unsigned long timeout;
+
+ pci_read_config_dword(dev, afu_control + OCXL_DVSEC_AFU_CTRL_TERM_PASID,
+ &val);
+ if (EXTRACT_BIT(val, 20)) {
+ dev_err(&dev->dev,
+ "Can't terminate PASID %#x, previous termination didn't complete\n",
+ pasid);
+ return -EBUSY;
+ }
+
+ val &= ~OCXL_DVSEC_PASID_MASK;
+ val |= pasid & OCXL_DVSEC_PASID_MASK;
+ val |= BIT(20);
+ pci_write_config_dword(dev,
+ afu_control + OCXL_DVSEC_AFU_CTRL_TERM_PASID,
+ val);
+
+ timeout = jiffies + (HZ * OCXL_CFG_TIMEOUT);
+ pci_read_config_dword(dev, afu_control + OCXL_DVSEC_AFU_CTRL_TERM_PASID,
+ &val);
+ while (EXTRACT_BIT(val, 20)) {
+ if (time_after_eq(jiffies, timeout)) {
+ dev_err(&dev->dev,
+ "Timeout while waiting for AFU to terminate PASID %#x\n",
+ pasid);
+ return -EBUSY;
+ }
+ cpu_relax();
+ pci_read_config_dword(dev,
+ afu_control + OCXL_DVSEC_AFU_CTRL_TERM_PASID,
+ &val);
+ }
+ return 0;
+}
+EXPORT_SYMBOL_GPL(ocxl_config_terminate_pasid);
+
+void ocxl_config_set_actag(struct pci_dev *dev, int func_dvsec, u32 tag_first,
+ u32 tag_count)
+{
+ u32 val;
+
+ val = (tag_first & OCXL_DVSEC_ACTAG_MASK) << 16;
+ val |= tag_count & OCXL_DVSEC_ACTAG_MASK;
+ pci_write_config_dword(dev, func_dvsec + OCXL_DVSEC_FUNC_OFF_ACTAG,
+ val);
+}
+EXPORT_SYMBOL_GPL(ocxl_config_set_actag);
diff --git a/drivers/misc/ocxl/context.c b/drivers/misc/ocxl/context.c
new file mode 100644
index 0000000000..7f83116ae1
--- /dev/null
+++ b/drivers/misc/ocxl/context.c
@@ -0,0 +1,296 @@
+// SPDX-License-Identifier: GPL-2.0+
+// Copyright 2017 IBM Corp.
+#include <linux/sched/mm.h>
+#include "trace.h"
+#include "ocxl_internal.h"
+
+int ocxl_context_alloc(struct ocxl_context **context, struct ocxl_afu *afu,
+ struct address_space *mapping)
+{
+ int pasid;
+ struct ocxl_context *ctx;
+
+ ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
+ if (!ctx)
+ return -ENOMEM;
+
+ ctx->afu = afu;
+ mutex_lock(&afu->contexts_lock);
+ pasid = idr_alloc(&afu->contexts_idr, ctx, afu->pasid_base,
+ afu->pasid_base + afu->pasid_max, GFP_KERNEL);
+ if (pasid < 0) {
+ mutex_unlock(&afu->contexts_lock);
+ kfree(ctx);
+ return pasid;
+ }
+ afu->pasid_count++;
+ mutex_unlock(&afu->contexts_lock);
+
+ ctx->pasid = pasid;
+ ctx->status = OPENED;
+ mutex_init(&ctx->status_mutex);
+ ctx->mapping = mapping;
+ mutex_init(&ctx->mapping_lock);
+ init_waitqueue_head(&ctx->events_wq);
+ mutex_init(&ctx->xsl_error_lock);
+ mutex_init(&ctx->irq_lock);
+ idr_init(&ctx->irq_idr);
+ ctx->tidr = 0;
+
+ /*
+ * Keep a reference on the AFU to make sure it's valid for the
+ * duration of the life of the context
+ */
+ ocxl_afu_get(afu);
+ *context = ctx;
+ return 0;
+}
+EXPORT_SYMBOL_GPL(ocxl_context_alloc);
+
+/*
+ * Callback for when a translation fault triggers an error
+ * data: a pointer to the context which triggered the fault
+ * addr: the address that triggered the error
+ * dsisr: the value of the PPC64 dsisr register
+ */
+static void xsl_fault_error(void *data, u64 addr, u64 dsisr)
+{
+ struct ocxl_context *ctx = (struct ocxl_context *) data;
+
+ mutex_lock(&ctx->xsl_error_lock);
+ ctx->xsl_error.addr = addr;
+ ctx->xsl_error.dsisr = dsisr;
+ ctx->xsl_error.count++;
+ mutex_unlock(&ctx->xsl_error_lock);
+
+ wake_up_all(&ctx->events_wq);
+}
+
+int ocxl_context_attach(struct ocxl_context *ctx, u64 amr, struct mm_struct *mm)
+{
+ int rc;
+ unsigned long pidr = 0;
+ struct pci_dev *dev;
+
+ // Locks both status & tidr
+ mutex_lock(&ctx->status_mutex);
+ if (ctx->status != OPENED) {
+ rc = -EIO;
+ goto out;
+ }
+
+ if (mm)
+ pidr = mm->context.id;
+
+ dev = to_pci_dev(ctx->afu->fn->dev.parent);
+ rc = ocxl_link_add_pe(ctx->afu->fn->link, ctx->pasid, pidr, ctx->tidr,
+ amr, pci_dev_id(dev), mm, xsl_fault_error, ctx);
+ if (rc)
+ goto out;
+
+ ctx->status = ATTACHED;
+out:
+ mutex_unlock(&ctx->status_mutex);
+ return rc;
+}
+EXPORT_SYMBOL_GPL(ocxl_context_attach);
+
+static vm_fault_t map_afu_irq(struct vm_area_struct *vma, unsigned long address,
+ u64 offset, struct ocxl_context *ctx)
+{
+ u64 trigger_addr;
+ int irq_id = ocxl_irq_offset_to_id(ctx, offset);
+
+ trigger_addr = ocxl_afu_irq_get_addr(ctx, irq_id);
+ if (!trigger_addr)
+ return VM_FAULT_SIGBUS;
+
+ return vmf_insert_pfn(vma, address, trigger_addr >> PAGE_SHIFT);
+}
+
+static vm_fault_t map_pp_mmio(struct vm_area_struct *vma, unsigned long address,
+ u64 offset, struct ocxl_context *ctx)
+{
+ u64 pp_mmio_addr;
+ int pasid_off;
+ vm_fault_t ret;
+
+ if (offset >= ctx->afu->config.pp_mmio_stride)
+ return VM_FAULT_SIGBUS;
+
+ mutex_lock(&ctx->status_mutex);
+ if (ctx->status != ATTACHED) {
+ mutex_unlock(&ctx->status_mutex);
+ pr_debug("%s: Context not attached, failing mmio mmap\n",
+ __func__);
+ return VM_FAULT_SIGBUS;
+ }
+
+ pasid_off = ctx->pasid - ctx->afu->pasid_base;
+ pp_mmio_addr = ctx->afu->pp_mmio_start +
+ pasid_off * ctx->afu->config.pp_mmio_stride +
+ offset;
+
+ ret = vmf_insert_pfn(vma, address, pp_mmio_addr >> PAGE_SHIFT);
+ mutex_unlock(&ctx->status_mutex);
+ return ret;
+}
+
+static vm_fault_t ocxl_mmap_fault(struct vm_fault *vmf)
+{
+ struct vm_area_struct *vma = vmf->vma;
+ struct ocxl_context *ctx = vma->vm_file->private_data;
+ u64 offset;
+ vm_fault_t ret;
+
+ offset = vmf->pgoff << PAGE_SHIFT;
+ pr_debug("%s: pasid %d address 0x%lx offset 0x%llx\n", __func__,
+ ctx->pasid, vmf->address, offset);
+
+ if (offset < ctx->afu->irq_base_offset)
+ ret = map_pp_mmio(vma, vmf->address, offset, ctx);
+ else
+ ret = map_afu_irq(vma, vmf->address, offset, ctx);
+ return ret;
+}
+
+static const struct vm_operations_struct ocxl_vmops = {
+ .fault = ocxl_mmap_fault,
+};
+
+static int check_mmap_afu_irq(struct ocxl_context *ctx,
+ struct vm_area_struct *vma)
+{
+ int irq_id = ocxl_irq_offset_to_id(ctx, vma->vm_pgoff << PAGE_SHIFT);
+
+ /* only one page */
+ if (vma_pages(vma) != 1)
+ return -EINVAL;
+
+ /* check offset validty */
+ if (!ocxl_afu_irq_get_addr(ctx, irq_id))
+ return -EINVAL;
+
+ /*
+ * trigger page should only be accessible in write mode.
+ *
+ * It's a bit theoretical, as a page mmaped with only
+ * PROT_WRITE is currently readable, but it doesn't hurt.
+ */
+ if ((vma->vm_flags & VM_READ) || (vma->vm_flags & VM_EXEC) ||
+ !(vma->vm_flags & VM_WRITE))
+ return -EINVAL;
+ vm_flags_clear(vma, VM_MAYREAD | VM_MAYEXEC);
+ return 0;
+}
+
+static int check_mmap_mmio(struct ocxl_context *ctx,
+ struct vm_area_struct *vma)
+{
+ if ((vma_pages(vma) + vma->vm_pgoff) >
+ (ctx->afu->config.pp_mmio_stride >> PAGE_SHIFT))
+ return -EINVAL;
+ return 0;
+}
+
+int ocxl_context_mmap(struct ocxl_context *ctx, struct vm_area_struct *vma)
+{
+ int rc;
+
+ if ((vma->vm_pgoff << PAGE_SHIFT) < ctx->afu->irq_base_offset)
+ rc = check_mmap_mmio(ctx, vma);
+ else
+ rc = check_mmap_afu_irq(ctx, vma);
+ if (rc)
+ return rc;
+
+ vm_flags_set(vma, VM_IO | VM_PFNMAP);
+ vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
+ vma->vm_ops = &ocxl_vmops;
+ return 0;
+}
+
+int ocxl_context_detach(struct ocxl_context *ctx)
+{
+ struct pci_dev *dev;
+ int afu_control_pos;
+ enum ocxl_context_status status;
+ int rc;
+
+ mutex_lock(&ctx->status_mutex);
+ status = ctx->status;
+ ctx->status = CLOSED;
+ mutex_unlock(&ctx->status_mutex);
+ if (status != ATTACHED)
+ return 0;
+
+ dev = to_pci_dev(ctx->afu->fn->dev.parent);
+ afu_control_pos = ctx->afu->config.dvsec_afu_control_pos;
+
+ mutex_lock(&ctx->afu->afu_control_lock);
+ rc = ocxl_config_terminate_pasid(dev, afu_control_pos, ctx->pasid);
+ mutex_unlock(&ctx->afu->afu_control_lock);
+ trace_ocxl_terminate_pasid(ctx->pasid, rc);
+ if (rc) {
+ /*
+ * If we timeout waiting for the AFU to terminate the
+ * pasid, then it's dangerous to clean up the Process
+ * Element entry in the SPA, as it may be referenced
+ * in the future by the AFU. In which case, we would
+ * checkstop because of an invalid PE access (FIR
+ * register 2, bit 42). So leave the PE
+ * defined. Caller shouldn't free the context so that
+ * PASID remains allocated.
+ *
+ * A link reset will be required to cleanup the AFU
+ * and the SPA.
+ */
+ if (rc == -EBUSY)
+ return rc;
+ }
+ rc = ocxl_link_remove_pe(ctx->afu->fn->link, ctx->pasid);
+ if (rc) {
+ dev_warn(&dev->dev,
+ "Couldn't remove PE entry cleanly: %d\n", rc);
+ }
+ return 0;
+}
+EXPORT_SYMBOL_GPL(ocxl_context_detach);
+
+void ocxl_context_detach_all(struct ocxl_afu *afu)
+{
+ struct ocxl_context *ctx;
+ int tmp;
+
+ mutex_lock(&afu->contexts_lock);
+ idr_for_each_entry(&afu->contexts_idr, ctx, tmp) {
+ ocxl_context_detach(ctx);
+ /*
+ * We are force detaching - remove any active mmio
+ * mappings so userspace cannot interfere with the
+ * card if it comes back. Easiest way to exercise
+ * this is to unbind and rebind the driver via sysfs
+ * while it is in use.
+ */
+ mutex_lock(&ctx->mapping_lock);
+ if (ctx->mapping)
+ unmap_mapping_range(ctx->mapping, 0, 0, 1);
+ mutex_unlock(&ctx->mapping_lock);
+ }
+ mutex_unlock(&afu->contexts_lock);
+}
+
+void ocxl_context_free(struct ocxl_context *ctx)
+{
+ mutex_lock(&ctx->afu->contexts_lock);
+ ctx->afu->pasid_count--;
+ idr_remove(&ctx->afu->contexts_idr, ctx->pasid);
+ mutex_unlock(&ctx->afu->contexts_lock);
+
+ ocxl_afu_irq_free_all(ctx);
+ idr_destroy(&ctx->irq_idr);
+ /* reference to the AFU taken in ocxl_context_alloc() */
+ ocxl_afu_put(ctx->afu);
+ kfree(ctx);
+}
+EXPORT_SYMBOL_GPL(ocxl_context_free);
diff --git a/drivers/misc/ocxl/core.c b/drivers/misc/ocxl/core.c
new file mode 100644
index 0000000000..aebfc53a2d
--- /dev/null
+++ b/drivers/misc/ocxl/core.c
@@ -0,0 +1,569 @@
+// SPDX-License-Identifier: GPL-2.0+
+// Copyright 2019 IBM Corp.
+#include <linux/idr.h>
+#include "ocxl_internal.h"
+
+static struct ocxl_fn *ocxl_fn_get(struct ocxl_fn *fn)
+{
+ return (get_device(&fn->dev) == NULL) ? NULL : fn;
+}
+
+static void ocxl_fn_put(struct ocxl_fn *fn)
+{
+ put_device(&fn->dev);
+}
+
+static struct ocxl_afu *alloc_afu(struct ocxl_fn *fn)
+{
+ struct ocxl_afu *afu;
+
+ afu = kzalloc(sizeof(struct ocxl_afu), GFP_KERNEL);
+ if (!afu)
+ return NULL;
+
+ kref_init(&afu->kref);
+ mutex_init(&afu->contexts_lock);
+ mutex_init(&afu->afu_control_lock);
+ idr_init(&afu->contexts_idr);
+ afu->fn = fn;
+ ocxl_fn_get(fn);
+ return afu;
+}
+
+static void free_afu(struct kref *kref)
+{
+ struct ocxl_afu *afu = container_of(kref, struct ocxl_afu, kref);
+
+ idr_destroy(&afu->contexts_idr);
+ ocxl_fn_put(afu->fn);
+ kfree(afu);
+}
+
+void ocxl_afu_get(struct ocxl_afu *afu)
+{
+ kref_get(&afu->kref);
+}
+EXPORT_SYMBOL_GPL(ocxl_afu_get);
+
+void ocxl_afu_put(struct ocxl_afu *afu)
+{
+ kref_put(&afu->kref, free_afu);
+}
+EXPORT_SYMBOL_GPL(ocxl_afu_put);
+
+static int assign_afu_actag(struct ocxl_afu *afu)
+{
+ struct ocxl_fn *fn = afu->fn;
+ int actag_count, actag_offset;
+ struct pci_dev *pci_dev = to_pci_dev(fn->dev.parent);
+
+ /*
+ * if there were not enough actags for the function, each afu
+ * reduces its count as well
+ */
+ actag_count = afu->config.actag_supported *
+ fn->actag_enabled / fn->actag_supported;
+ actag_offset = ocxl_actag_afu_alloc(fn, actag_count);
+ if (actag_offset < 0) {
+ dev_err(&pci_dev->dev, "Can't allocate %d actags for AFU: %d\n",
+ actag_count, actag_offset);
+ return actag_offset;
+ }
+ afu->actag_base = fn->actag_base + actag_offset;
+ afu->actag_enabled = actag_count;
+
+ ocxl_config_set_afu_actag(pci_dev, afu->config.dvsec_afu_control_pos,
+ afu->actag_base, afu->actag_enabled);
+ dev_dbg(&pci_dev->dev, "actag base=%d enabled=%d\n",
+ afu->actag_base, afu->actag_enabled);
+ return 0;
+}
+
+static void reclaim_afu_actag(struct ocxl_afu *afu)
+{
+ struct ocxl_fn *fn = afu->fn;
+ int start_offset, size;
+
+ start_offset = afu->actag_base - fn->actag_base;
+ size = afu->actag_enabled;
+ ocxl_actag_afu_free(afu->fn, start_offset, size);
+}
+
+static int assign_afu_pasid(struct ocxl_afu *afu)
+{
+ struct ocxl_fn *fn = afu->fn;
+ int pasid_count, pasid_offset;
+ struct pci_dev *pci_dev = to_pci_dev(fn->dev.parent);
+
+ /*
+ * We only support the case where the function configuration
+ * requested enough PASIDs to cover all AFUs.
+ */
+ pasid_count = 1 << afu->config.pasid_supported_log;
+ pasid_offset = ocxl_pasid_afu_alloc(fn, pasid_count);
+ if (pasid_offset < 0) {
+ dev_err(&pci_dev->dev, "Can't allocate %d PASIDs for AFU: %d\n",
+ pasid_count, pasid_offset);
+ return pasid_offset;
+ }
+ afu->pasid_base = fn->pasid_base + pasid_offset;
+ afu->pasid_count = 0;
+ afu->pasid_max = pasid_count;
+
+ ocxl_config_set_afu_pasid(pci_dev, afu->config.dvsec_afu_control_pos,
+ afu->pasid_base,
+ afu->config.pasid_supported_log);
+ dev_dbg(&pci_dev->dev, "PASID base=%d, enabled=%d\n",
+ afu->pasid_base, pasid_count);
+ return 0;
+}
+
+static void reclaim_afu_pasid(struct ocxl_afu *afu)
+{
+ struct ocxl_fn *fn = afu->fn;
+ int start_offset, size;
+
+ start_offset = afu->pasid_base - fn->pasid_base;
+ size = 1 << afu->config.pasid_supported_log;
+ ocxl_pasid_afu_free(afu->fn, start_offset, size);
+}
+
+static int reserve_fn_bar(struct ocxl_fn *fn, int bar)
+{
+ struct pci_dev *dev = to_pci_dev(fn->dev.parent);
+ int rc, idx;
+
+ if (bar != 0 && bar != 2 && bar != 4)
+ return -EINVAL;
+
+ idx = bar >> 1;
+ if (fn->bar_used[idx]++ == 0) {
+ rc = pci_request_region(dev, bar, "ocxl");
+ if (rc)
+ return rc;
+ }
+ return 0;
+}
+
+static void release_fn_bar(struct ocxl_fn *fn, int bar)
+{
+ struct pci_dev *dev = to_pci_dev(fn->dev.parent);
+ int idx;
+
+ if (bar != 0 && bar != 2 && bar != 4)
+ return;
+
+ idx = bar >> 1;
+ if (--fn->bar_used[idx] == 0)
+ pci_release_region(dev, bar);
+ WARN_ON(fn->bar_used[idx] < 0);
+}
+
+static int map_mmio_areas(struct ocxl_afu *afu)
+{
+ int rc;
+ struct pci_dev *pci_dev = to_pci_dev(afu->fn->dev.parent);
+
+ rc = reserve_fn_bar(afu->fn, afu->config.global_mmio_bar);
+ if (rc)
+ return rc;
+
+ rc = reserve_fn_bar(afu->fn, afu->config.pp_mmio_bar);
+ if (rc) {
+ release_fn_bar(afu->fn, afu->config.global_mmio_bar);
+ return rc;
+ }
+
+ afu->global_mmio_start =
+ pci_resource_start(pci_dev, afu->config.global_mmio_bar) +
+ afu->config.global_mmio_offset;
+ afu->pp_mmio_start =
+ pci_resource_start(pci_dev, afu->config.pp_mmio_bar) +
+ afu->config.pp_mmio_offset;
+
+ afu->global_mmio_ptr = ioremap(afu->global_mmio_start,
+ afu->config.global_mmio_size);
+ if (!afu->global_mmio_ptr) {
+ release_fn_bar(afu->fn, afu->config.pp_mmio_bar);
+ release_fn_bar(afu->fn, afu->config.global_mmio_bar);
+ dev_err(&pci_dev->dev, "Error mapping global mmio area\n");
+ return -ENOMEM;
+ }
+
+ /*
+ * Leave an empty page between the per-process mmio area and
+ * the AFU interrupt mappings
+ */
+ afu->irq_base_offset = afu->config.pp_mmio_stride + PAGE_SIZE;
+ return 0;
+}
+
+static void unmap_mmio_areas(struct ocxl_afu *afu)
+{
+ if (afu->global_mmio_ptr) {
+ iounmap(afu->global_mmio_ptr);
+ afu->global_mmio_ptr = NULL;
+ }
+ afu->global_mmio_start = 0;
+ afu->pp_mmio_start = 0;
+ release_fn_bar(afu->fn, afu->config.pp_mmio_bar);
+ release_fn_bar(afu->fn, afu->config.global_mmio_bar);
+}
+
+static int configure_afu(struct ocxl_afu *afu, u8 afu_idx, struct pci_dev *dev)
+{
+ int rc;
+
+ rc = ocxl_config_read_afu(dev, &afu->fn->config, &afu->config, afu_idx);
+ if (rc)
+ return rc;
+
+ rc = assign_afu_actag(afu);
+ if (rc)
+ return rc;
+
+ rc = assign_afu_pasid(afu);
+ if (rc)
+ goto err_free_actag;
+
+ rc = map_mmio_areas(afu);
+ if (rc)
+ goto err_free_pasid;
+
+ return 0;
+
+err_free_pasid:
+ reclaim_afu_pasid(afu);
+err_free_actag:
+ reclaim_afu_actag(afu);
+ return rc;
+}
+
+static void deconfigure_afu(struct ocxl_afu *afu)
+{
+ unmap_mmio_areas(afu);
+ reclaim_afu_pasid(afu);
+ reclaim_afu_actag(afu);
+}
+
+static int activate_afu(struct pci_dev *dev, struct ocxl_afu *afu)
+{
+ ocxl_config_set_afu_state(dev, afu->config.dvsec_afu_control_pos, 1);
+
+ return 0;
+}
+
+static void deactivate_afu(struct ocxl_afu *afu)
+{
+ struct pci_dev *dev = to_pci_dev(afu->fn->dev.parent);
+
+ ocxl_config_set_afu_state(dev, afu->config.dvsec_afu_control_pos, 0);
+}
+
+static int init_afu(struct pci_dev *dev, struct ocxl_fn *fn, u8 afu_idx)
+{
+ int rc;
+ struct ocxl_afu *afu;
+
+ afu = alloc_afu(fn);
+ if (!afu)
+ return -ENOMEM;
+
+ rc = configure_afu(afu, afu_idx, dev);
+ if (rc) {
+ ocxl_afu_put(afu);
+ return rc;
+ }
+
+ rc = activate_afu(dev, afu);
+ if (rc) {
+ deconfigure_afu(afu);
+ ocxl_afu_put(afu);
+ return rc;
+ }
+
+ list_add_tail(&afu->list, &fn->afu_list);
+
+ return 0;
+}
+
+static void remove_afu(struct ocxl_afu *afu)
+{
+ list_del(&afu->list);
+ ocxl_context_detach_all(afu);
+ deactivate_afu(afu);
+ deconfigure_afu(afu);
+ ocxl_afu_put(afu); // matches the implicit get in alloc_afu
+}
+
+static struct ocxl_fn *alloc_function(void)
+{
+ struct ocxl_fn *fn;
+
+ fn = kzalloc(sizeof(struct ocxl_fn), GFP_KERNEL);
+ if (!fn)
+ return NULL;
+
+ INIT_LIST_HEAD(&fn->afu_list);
+ INIT_LIST_HEAD(&fn->pasid_list);
+ INIT_LIST_HEAD(&fn->actag_list);
+
+ return fn;
+}
+
+static void free_function(struct ocxl_fn *fn)
+{
+ WARN_ON(!list_empty(&fn->afu_list));
+ WARN_ON(!list_empty(&fn->pasid_list));
+ kfree(fn);
+}
+
+static void free_function_dev(struct device *dev)
+{
+ struct ocxl_fn *fn = container_of(dev, struct ocxl_fn, dev);
+
+ free_function(fn);
+}
+
+static int set_function_device(struct ocxl_fn *fn, struct pci_dev *dev)
+{
+ fn->dev.parent = &dev->dev;
+ fn->dev.release = free_function_dev;
+ return dev_set_name(&fn->dev, "ocxlfn.%s", dev_name(&dev->dev));
+}
+
+static int assign_function_actag(struct ocxl_fn *fn)
+{
+ struct pci_dev *dev = to_pci_dev(fn->dev.parent);
+ u16 base, enabled, supported;
+ int rc;
+
+ rc = ocxl_config_get_actag_info(dev, &base, &enabled, &supported);
+ if (rc)
+ return rc;
+
+ fn->actag_base = base;
+ fn->actag_enabled = enabled;
+ fn->actag_supported = supported;
+
+ ocxl_config_set_actag(dev, fn->config.dvsec_function_pos,
+ fn->actag_base, fn->actag_enabled);
+ dev_dbg(&fn->dev, "actag range starting at %d, enabled %d\n",
+ fn->actag_base, fn->actag_enabled);
+ return 0;
+}
+
+static int set_function_pasid(struct ocxl_fn *fn)
+{
+ struct pci_dev *dev = to_pci_dev(fn->dev.parent);
+ int rc, desired_count, max_count;
+
+ /* A function may not require any PASID */
+ if (fn->config.max_pasid_log < 0)
+ return 0;
+
+ rc = ocxl_config_get_pasid_info(dev, &max_count);
+ if (rc)
+ return rc;
+
+ desired_count = 1 << fn->config.max_pasid_log;
+
+ if (desired_count > max_count) {
+ dev_err(&fn->dev,
+ "Function requires more PASIDs than is available (%d vs. %d)\n",
+ desired_count, max_count);
+ return -ENOSPC;
+ }
+
+ fn->pasid_base = 0;
+ return 0;
+}
+
+static int configure_function(struct ocxl_fn *fn, struct pci_dev *dev)
+{
+ int rc;
+
+ rc = pci_enable_device(dev);
+ if (rc) {
+ dev_err(&dev->dev, "pci_enable_device failed: %d\n", rc);
+ return rc;
+ }
+
+ /*
+ * Once it has been confirmed to work on our hardware, we
+ * should reset the function, to force the adapter to restart
+ * from scratch.
+ * A function reset would also reset all its AFUs.
+ *
+ * Some hints for implementation:
+ *
+ * - there's not status bit to know when the reset is done. We
+ * should try reading the config space to know when it's
+ * done.
+ * - probably something like:
+ * Reset
+ * wait 100ms
+ * issue config read
+ * allow device up to 1 sec to return success on config
+ * read before declaring it broken
+ *
+ * Some shared logic on the card (CFG, TLX) won't be reset, so
+ * there's no guarantee that it will be enough.
+ */
+ rc = ocxl_config_read_function(dev, &fn->config);
+ if (rc)
+ return rc;
+
+ rc = set_function_device(fn, dev);
+ if (rc)
+ return rc;
+
+ rc = assign_function_actag(fn);
+ if (rc)
+ return rc;
+
+ rc = set_function_pasid(fn);
+ if (rc)
+ return rc;
+
+ rc = ocxl_link_setup(dev, 0, &fn->link);
+ if (rc)
+ return rc;
+
+ rc = ocxl_config_set_TL(dev, fn->config.dvsec_tl_pos);
+ if (rc) {
+ ocxl_link_release(dev, fn->link);
+ return rc;
+ }
+ return 0;
+}
+
+static void deconfigure_function(struct ocxl_fn *fn)
+{
+ struct pci_dev *dev = to_pci_dev(fn->dev.parent);
+
+ ocxl_link_release(dev, fn->link);
+ pci_disable_device(dev);
+}
+
+static struct ocxl_fn *init_function(struct pci_dev *dev)
+{
+ struct ocxl_fn *fn;
+ int rc;
+
+ fn = alloc_function();
+ if (!fn)
+ return ERR_PTR(-ENOMEM);
+
+ rc = configure_function(fn, dev);
+ if (rc) {
+ free_function(fn);
+ return ERR_PTR(rc);
+ }
+
+ rc = device_register(&fn->dev);
+ if (rc) {
+ deconfigure_function(fn);
+ put_device(&fn->dev);
+ return ERR_PTR(rc);
+ }
+ return fn;
+}
+
+// Device detection & initialisation
+
+struct ocxl_fn *ocxl_function_open(struct pci_dev *dev)
+{
+ int rc, afu_count = 0;
+ u8 afu;
+ struct ocxl_fn *fn;
+
+ if (!radix_enabled()) {
+ dev_err(&dev->dev, "Unsupported memory model (hash)\n");
+ return ERR_PTR(-ENODEV);
+ }
+
+ fn = init_function(dev);
+ if (IS_ERR(fn)) {
+ dev_err(&dev->dev, "function init failed: %li\n",
+ PTR_ERR(fn));
+ return fn;
+ }
+
+ for (afu = 0; afu <= fn->config.max_afu_index; afu++) {
+ rc = ocxl_config_check_afu_index(dev, &fn->config, afu);
+ if (rc > 0) {
+ rc = init_afu(dev, fn, afu);
+ if (rc) {
+ dev_err(&dev->dev,
+ "Can't initialize AFU index %d\n", afu);
+ continue;
+ }
+ afu_count++;
+ }
+ }
+ dev_info(&dev->dev, "%d AFU(s) configured\n", afu_count);
+ return fn;
+}
+EXPORT_SYMBOL_GPL(ocxl_function_open);
+
+struct list_head *ocxl_function_afu_list(struct ocxl_fn *fn)
+{
+ return &fn->afu_list;
+}
+EXPORT_SYMBOL_GPL(ocxl_function_afu_list);
+
+struct ocxl_afu *ocxl_function_fetch_afu(struct ocxl_fn *fn, u8 afu_idx)
+{
+ struct ocxl_afu *afu;
+
+ list_for_each_entry(afu, &fn->afu_list, list) {
+ if (afu->config.idx == afu_idx)
+ return afu;
+ }
+
+ return NULL;
+}
+EXPORT_SYMBOL_GPL(ocxl_function_fetch_afu);
+
+const struct ocxl_fn_config *ocxl_function_config(struct ocxl_fn *fn)
+{
+ return &fn->config;
+}
+EXPORT_SYMBOL_GPL(ocxl_function_config);
+
+void ocxl_function_close(struct ocxl_fn *fn)
+{
+ struct ocxl_afu *afu, *tmp;
+
+ list_for_each_entry_safe(afu, tmp, &fn->afu_list, list) {
+ remove_afu(afu);
+ }
+
+ deconfigure_function(fn);
+ device_unregister(&fn->dev);
+}
+EXPORT_SYMBOL_GPL(ocxl_function_close);
+
+// AFU Metadata
+
+struct ocxl_afu_config *ocxl_afu_config(struct ocxl_afu *afu)
+{
+ return &afu->config;
+}
+EXPORT_SYMBOL_GPL(ocxl_afu_config);
+
+void ocxl_afu_set_private(struct ocxl_afu *afu, void *private)
+{
+ afu->private = private;
+}
+EXPORT_SYMBOL_GPL(ocxl_afu_set_private);
+
+void *ocxl_afu_get_private(struct ocxl_afu *afu)
+{
+ if (afu)
+ return afu->private;
+
+ return NULL;
+}
+EXPORT_SYMBOL_GPL(ocxl_afu_get_private);
diff --git a/drivers/misc/ocxl/file.c b/drivers/misc/ocxl/file.c
new file mode 100644
index 0000000000..6e63f060e4
--- /dev/null
+++ b/drivers/misc/ocxl/file.c
@@ -0,0 +1,620 @@
+// SPDX-License-Identifier: GPL-2.0+
+// Copyright 2017 IBM Corp.
+#include <linux/fs.h>
+#include <linux/poll.h>
+#include <linux/sched/signal.h>
+#include <linux/eventfd.h>
+#include <linux/uaccess.h>
+#include <uapi/misc/ocxl.h>
+#include <asm/reg.h>
+#include <asm/switch_to.h>
+#include "ocxl_internal.h"
+
+
+#define OCXL_NUM_MINORS 256 /* Total to reserve */
+
+static dev_t ocxl_dev;
+static struct class *ocxl_class;
+static DEFINE_MUTEX(minors_idr_lock);
+static struct idr minors_idr;
+
+static struct ocxl_file_info *find_and_get_file_info(dev_t devno)
+{
+ struct ocxl_file_info *info;
+
+ mutex_lock(&minors_idr_lock);
+ info = idr_find(&minors_idr, MINOR(devno));
+ if (info)
+ get_device(&info->dev);
+ mutex_unlock(&minors_idr_lock);
+ return info;
+}
+
+static int allocate_minor(struct ocxl_file_info *info)
+{
+ int minor;
+
+ mutex_lock(&minors_idr_lock);
+ minor = idr_alloc(&minors_idr, info, 0, OCXL_NUM_MINORS, GFP_KERNEL);
+ mutex_unlock(&minors_idr_lock);
+ return minor;
+}
+
+static void free_minor(struct ocxl_file_info *info)
+{
+ mutex_lock(&minors_idr_lock);
+ idr_remove(&minors_idr, MINOR(info->dev.devt));
+ mutex_unlock(&minors_idr_lock);
+}
+
+static int afu_open(struct inode *inode, struct file *file)
+{
+ struct ocxl_file_info *info;
+ struct ocxl_context *ctx;
+ int rc;
+
+ pr_debug("%s for device %x\n", __func__, inode->i_rdev);
+
+ info = find_and_get_file_info(inode->i_rdev);
+ if (!info)
+ return -ENODEV;
+
+ rc = ocxl_context_alloc(&ctx, info->afu, inode->i_mapping);
+ if (rc) {
+ put_device(&info->dev);
+ return rc;
+ }
+ put_device(&info->dev);
+ file->private_data = ctx;
+ return 0;
+}
+
+static long afu_ioctl_attach(struct ocxl_context *ctx,
+ struct ocxl_ioctl_attach __user *uarg)
+{
+ struct ocxl_ioctl_attach arg;
+ u64 amr = 0;
+
+ pr_debug("%s for context %d\n", __func__, ctx->pasid);
+
+ if (copy_from_user(&arg, uarg, sizeof(arg)))
+ return -EFAULT;
+
+ /* Make sure reserved fields are not set for forward compatibility */
+ if (arg.reserved1 || arg.reserved2 || arg.reserved3)
+ return -EINVAL;
+
+ amr = arg.amr & mfspr(SPRN_UAMOR);
+ return ocxl_context_attach(ctx, amr, current->mm);
+}
+
+static long afu_ioctl_get_metadata(struct ocxl_context *ctx,
+ struct ocxl_ioctl_metadata __user *uarg)
+{
+ struct ocxl_ioctl_metadata arg;
+
+ memset(&arg, 0, sizeof(arg));
+
+ arg.version = 0;
+
+ arg.afu_version_major = ctx->afu->config.version_major;
+ arg.afu_version_minor = ctx->afu->config.version_minor;
+ arg.pasid = ctx->pasid;
+ arg.pp_mmio_size = ctx->afu->config.pp_mmio_stride;
+ arg.global_mmio_size = ctx->afu->config.global_mmio_size;
+
+ if (copy_to_user(uarg, &arg, sizeof(arg)))
+ return -EFAULT;
+
+ return 0;
+}
+
+#ifdef CONFIG_PPC64
+static long afu_ioctl_enable_p9_wait(struct ocxl_context *ctx,
+ struct ocxl_ioctl_p9_wait __user *uarg)
+{
+ struct ocxl_ioctl_p9_wait arg;
+
+ memset(&arg, 0, sizeof(arg));
+
+ if (cpu_has_feature(CPU_FTR_P9_TIDR)) {
+ enum ocxl_context_status status;
+
+ // Locks both status & tidr
+ mutex_lock(&ctx->status_mutex);
+ if (!ctx->tidr) {
+ if (set_thread_tidr(current)) {
+ mutex_unlock(&ctx->status_mutex);
+ return -ENOENT;
+ }
+
+ ctx->tidr = current->thread.tidr;
+ }
+
+ status = ctx->status;
+ mutex_unlock(&ctx->status_mutex);
+
+ if (status == ATTACHED) {
+ int rc = ocxl_link_update_pe(ctx->afu->fn->link,
+ ctx->pasid, ctx->tidr);
+
+ if (rc)
+ return rc;
+ }
+
+ arg.thread_id = ctx->tidr;
+ } else
+ return -ENOENT;
+
+ if (copy_to_user(uarg, &arg, sizeof(arg)))
+ return -EFAULT;
+
+ return 0;
+}
+#endif
+
+
+static long afu_ioctl_get_features(struct ocxl_context *ctx,
+ struct ocxl_ioctl_features __user *uarg)
+{
+ struct ocxl_ioctl_features arg;
+
+ memset(&arg, 0, sizeof(arg));
+
+#ifdef CONFIG_PPC64
+ if (cpu_has_feature(CPU_FTR_P9_TIDR))
+ arg.flags[0] |= OCXL_IOCTL_FEATURES_FLAGS0_P9_WAIT;
+#endif
+
+ if (copy_to_user(uarg, &arg, sizeof(arg)))
+ return -EFAULT;
+
+ return 0;
+}
+
+#define CMD_STR(x) (x == OCXL_IOCTL_ATTACH ? "ATTACH" : \
+ x == OCXL_IOCTL_IRQ_ALLOC ? "IRQ_ALLOC" : \
+ x == OCXL_IOCTL_IRQ_FREE ? "IRQ_FREE" : \
+ x == OCXL_IOCTL_IRQ_SET_FD ? "IRQ_SET_FD" : \
+ x == OCXL_IOCTL_GET_METADATA ? "GET_METADATA" : \
+ x == OCXL_IOCTL_ENABLE_P9_WAIT ? "ENABLE_P9_WAIT" : \
+ x == OCXL_IOCTL_GET_FEATURES ? "GET_FEATURES" : \
+ "UNKNOWN")
+
+static irqreturn_t irq_handler(void *private)
+{
+ struct eventfd_ctx *ev_ctx = private;
+
+ eventfd_signal(ev_ctx, 1);
+ return IRQ_HANDLED;
+}
+
+static void irq_free(void *private)
+{
+ struct eventfd_ctx *ev_ctx = private;
+
+ eventfd_ctx_put(ev_ctx);
+}
+
+static long afu_ioctl(struct file *file, unsigned int cmd,
+ unsigned long args)
+{
+ struct ocxl_context *ctx = file->private_data;
+ struct ocxl_ioctl_irq_fd irq_fd;
+ struct eventfd_ctx *ev_ctx;
+ int irq_id;
+ u64 irq_offset;
+ long rc;
+ bool closed;
+
+ pr_debug("%s for context %d, command %s\n", __func__, ctx->pasid,
+ CMD_STR(cmd));
+
+ mutex_lock(&ctx->status_mutex);
+ closed = (ctx->status == CLOSED);
+ mutex_unlock(&ctx->status_mutex);
+
+ if (closed)
+ return -EIO;
+
+ switch (cmd) {
+ case OCXL_IOCTL_ATTACH:
+ rc = afu_ioctl_attach(ctx,
+ (struct ocxl_ioctl_attach __user *) args);
+ break;
+
+ case OCXL_IOCTL_IRQ_ALLOC:
+ rc = ocxl_afu_irq_alloc(ctx, &irq_id);
+ if (!rc) {
+ irq_offset = ocxl_irq_id_to_offset(ctx, irq_id);
+ rc = copy_to_user((u64 __user *) args, &irq_offset,
+ sizeof(irq_offset));
+ if (rc) {
+ ocxl_afu_irq_free(ctx, irq_id);
+ return -EFAULT;
+ }
+ }
+ break;
+
+ case OCXL_IOCTL_IRQ_FREE:
+ rc = copy_from_user(&irq_offset, (u64 __user *) args,
+ sizeof(irq_offset));
+ if (rc)
+ return -EFAULT;
+ irq_id = ocxl_irq_offset_to_id(ctx, irq_offset);
+ rc = ocxl_afu_irq_free(ctx, irq_id);
+ break;
+
+ case OCXL_IOCTL_IRQ_SET_FD:
+ rc = copy_from_user(&irq_fd, (u64 __user *) args,
+ sizeof(irq_fd));
+ if (rc)
+ return -EFAULT;
+ if (irq_fd.reserved)
+ return -EINVAL;
+ irq_id = ocxl_irq_offset_to_id(ctx, irq_fd.irq_offset);
+ ev_ctx = eventfd_ctx_fdget(irq_fd.eventfd);
+ if (IS_ERR(ev_ctx))
+ return PTR_ERR(ev_ctx);
+ rc = ocxl_irq_set_handler(ctx, irq_id, irq_handler, irq_free, ev_ctx);
+ if (rc)
+ eventfd_ctx_put(ev_ctx);
+ break;
+
+ case OCXL_IOCTL_GET_METADATA:
+ rc = afu_ioctl_get_metadata(ctx,
+ (struct ocxl_ioctl_metadata __user *) args);
+ break;
+
+#ifdef CONFIG_PPC64
+ case OCXL_IOCTL_ENABLE_P9_WAIT:
+ rc = afu_ioctl_enable_p9_wait(ctx,
+ (struct ocxl_ioctl_p9_wait __user *) args);
+ break;
+#endif
+
+ case OCXL_IOCTL_GET_FEATURES:
+ rc = afu_ioctl_get_features(ctx,
+ (struct ocxl_ioctl_features __user *) args);
+ break;
+
+ default:
+ rc = -EINVAL;
+ }
+ return rc;
+}
+
+static long afu_compat_ioctl(struct file *file, unsigned int cmd,
+ unsigned long args)
+{
+ return afu_ioctl(file, cmd, args);
+}
+
+static int afu_mmap(struct file *file, struct vm_area_struct *vma)
+{
+ struct ocxl_context *ctx = file->private_data;
+
+ pr_debug("%s for context %d\n", __func__, ctx->pasid);
+ return ocxl_context_mmap(ctx, vma);
+}
+
+static bool has_xsl_error(struct ocxl_context *ctx)
+{
+ bool ret;
+
+ mutex_lock(&ctx->xsl_error_lock);
+ ret = !!ctx->xsl_error.addr;
+ mutex_unlock(&ctx->xsl_error_lock);
+
+ return ret;
+}
+
+/*
+ * Are there any events pending on the AFU
+ * ctx: The AFU context
+ * Returns: true if there are events pending
+ */
+static bool afu_events_pending(struct ocxl_context *ctx)
+{
+ if (has_xsl_error(ctx))
+ return true;
+ return false;
+}
+
+static unsigned int afu_poll(struct file *file, struct poll_table_struct *wait)
+{
+ struct ocxl_context *ctx = file->private_data;
+ unsigned int mask = 0;
+ bool closed;
+
+ pr_debug("%s for context %d\n", __func__, ctx->pasid);
+
+ poll_wait(file, &ctx->events_wq, wait);
+
+ mutex_lock(&ctx->status_mutex);
+ closed = (ctx->status == CLOSED);
+ mutex_unlock(&ctx->status_mutex);
+
+ if (afu_events_pending(ctx))
+ mask = EPOLLIN | EPOLLRDNORM;
+ else if (closed)
+ mask = EPOLLERR;
+
+ return mask;
+}
+
+/*
+ * Populate the supplied buffer with a single XSL error
+ * ctx: The AFU context to report the error from
+ * header: the event header to populate
+ * buf: The buffer to write the body into (should be at least
+ * AFU_EVENT_BODY_XSL_ERROR_SIZE)
+ * Return: the amount of buffer that was populated
+ */
+static ssize_t append_xsl_error(struct ocxl_context *ctx,
+ struct ocxl_kernel_event_header *header,
+ char __user *buf)
+{
+ struct ocxl_kernel_event_xsl_fault_error body;
+
+ memset(&body, 0, sizeof(body));
+
+ mutex_lock(&ctx->xsl_error_lock);
+ if (!ctx->xsl_error.addr) {
+ mutex_unlock(&ctx->xsl_error_lock);
+ return 0;
+ }
+
+ body.addr = ctx->xsl_error.addr;
+ body.dsisr = ctx->xsl_error.dsisr;
+ body.count = ctx->xsl_error.count;
+
+ ctx->xsl_error.addr = 0;
+ ctx->xsl_error.dsisr = 0;
+ ctx->xsl_error.count = 0;
+
+ mutex_unlock(&ctx->xsl_error_lock);
+
+ header->type = OCXL_AFU_EVENT_XSL_FAULT_ERROR;
+
+ if (copy_to_user(buf, &body, sizeof(body)))
+ return -EFAULT;
+
+ return sizeof(body);
+}
+
+#define AFU_EVENT_BODY_MAX_SIZE sizeof(struct ocxl_kernel_event_xsl_fault_error)
+
+/*
+ * Reports events on the AFU
+ * Format:
+ * Header (struct ocxl_kernel_event_header)
+ * Body (struct ocxl_kernel_event_*)
+ * Header...
+ */
+static ssize_t afu_read(struct file *file, char __user *buf, size_t count,
+ loff_t *off)
+{
+ struct ocxl_context *ctx = file->private_data;
+ struct ocxl_kernel_event_header header;
+ ssize_t rc;
+ ssize_t used = 0;
+ DEFINE_WAIT(event_wait);
+
+ memset(&header, 0, sizeof(header));
+
+ /* Require offset to be 0 */
+ if (*off != 0)
+ return -EINVAL;
+
+ if (count < (sizeof(struct ocxl_kernel_event_header) +
+ AFU_EVENT_BODY_MAX_SIZE))
+ return -EINVAL;
+
+ for (;;) {
+ prepare_to_wait(&ctx->events_wq, &event_wait,
+ TASK_INTERRUPTIBLE);
+
+ if (afu_events_pending(ctx))
+ break;
+
+ if (ctx->status == CLOSED)
+ break;
+
+ if (file->f_flags & O_NONBLOCK) {
+ finish_wait(&ctx->events_wq, &event_wait);
+ return -EAGAIN;
+ }
+
+ if (signal_pending(current)) {
+ finish_wait(&ctx->events_wq, &event_wait);
+ return -ERESTARTSYS;
+ }
+
+ schedule();
+ }
+
+ finish_wait(&ctx->events_wq, &event_wait);
+
+ if (has_xsl_error(ctx)) {
+ used = append_xsl_error(ctx, &header, buf + sizeof(header));
+ if (used < 0)
+ return used;
+ }
+
+ if (!afu_events_pending(ctx))
+ header.flags |= OCXL_KERNEL_EVENT_FLAG_LAST;
+
+ if (copy_to_user(buf, &header, sizeof(header)))
+ return -EFAULT;
+
+ used += sizeof(header);
+
+ rc = used;
+ return rc;
+}
+
+static int afu_release(struct inode *inode, struct file *file)
+{
+ struct ocxl_context *ctx = file->private_data;
+ int rc;
+
+ pr_debug("%s for device %x\n", __func__, inode->i_rdev);
+ rc = ocxl_context_detach(ctx);
+ mutex_lock(&ctx->mapping_lock);
+ ctx->mapping = NULL;
+ mutex_unlock(&ctx->mapping_lock);
+ wake_up_all(&ctx->events_wq);
+ if (rc != -EBUSY)
+ ocxl_context_free(ctx);
+ return 0;
+}
+
+static const struct file_operations ocxl_afu_fops = {
+ .owner = THIS_MODULE,
+ .open = afu_open,
+ .unlocked_ioctl = afu_ioctl,
+ .compat_ioctl = afu_compat_ioctl,
+ .mmap = afu_mmap,
+ .poll = afu_poll,
+ .read = afu_read,
+ .release = afu_release,
+};
+
+// Free the info struct
+static void info_release(struct device *dev)
+{
+ struct ocxl_file_info *info = container_of(dev, struct ocxl_file_info, dev);
+
+ ocxl_afu_put(info->afu);
+ kfree(info);
+}
+
+static int ocxl_file_make_visible(struct ocxl_file_info *info)
+{
+ int rc;
+
+ cdev_init(&info->cdev, &ocxl_afu_fops);
+ rc = cdev_add(&info->cdev, info->dev.devt, 1);
+ if (rc) {
+ dev_err(&info->dev, "Unable to add afu char device: %d\n", rc);
+ return rc;
+ }
+
+ return 0;
+}
+
+static void ocxl_file_make_invisible(struct ocxl_file_info *info)
+{
+ cdev_del(&info->cdev);
+}
+
+int ocxl_file_register_afu(struct ocxl_afu *afu)
+{
+ int minor;
+ int rc;
+ struct ocxl_file_info *info;
+ struct ocxl_fn *fn = afu->fn;
+ struct pci_dev *pci_dev = to_pci_dev(fn->dev.parent);
+
+ info = kzalloc(sizeof(*info), GFP_KERNEL);
+ if (info == NULL)
+ return -ENOMEM;
+
+ minor = allocate_minor(info);
+ if (minor < 0) {
+ kfree(info);
+ return minor;
+ }
+
+ info->dev.parent = &fn->dev;
+ info->dev.devt = MKDEV(MAJOR(ocxl_dev), minor);
+ info->dev.class = ocxl_class;
+ info->dev.release = info_release;
+
+ info->afu = afu;
+ ocxl_afu_get(afu);
+
+ rc = dev_set_name(&info->dev, "%s.%s.%hhu",
+ afu->config.name, dev_name(&pci_dev->dev), afu->config.idx);
+ if (rc)
+ goto err_put;
+
+ rc = device_register(&info->dev);
+ if (rc) {
+ free_minor(info);
+ put_device(&info->dev);
+ return rc;
+ }
+
+ rc = ocxl_sysfs_register_afu(info);
+ if (rc)
+ goto err_unregister;
+
+ rc = ocxl_file_make_visible(info);
+ if (rc)
+ goto err_unregister;
+
+ ocxl_afu_set_private(afu, info);
+
+ return 0;
+
+err_unregister:
+ ocxl_sysfs_unregister_afu(info); // safe to call even if register failed
+ free_minor(info);
+ device_unregister(&info->dev);
+ return rc;
+err_put:
+ ocxl_afu_put(afu);
+ free_minor(info);
+ kfree(info);
+ return rc;
+}
+
+void ocxl_file_unregister_afu(struct ocxl_afu *afu)
+{
+ struct ocxl_file_info *info = ocxl_afu_get_private(afu);
+
+ if (!info)
+ return;
+
+ ocxl_file_make_invisible(info);
+ ocxl_sysfs_unregister_afu(info);
+ free_minor(info);
+ device_unregister(&info->dev);
+}
+
+static char *ocxl_devnode(const struct device *dev, umode_t *mode)
+{
+ return kasprintf(GFP_KERNEL, "ocxl/%s", dev_name(dev));
+}
+
+int ocxl_file_init(void)
+{
+ int rc;
+
+ idr_init(&minors_idr);
+
+ rc = alloc_chrdev_region(&ocxl_dev, 0, OCXL_NUM_MINORS, "ocxl");
+ if (rc) {
+ pr_err("Unable to allocate ocxl major number: %d\n", rc);
+ return rc;
+ }
+
+ ocxl_class = class_create("ocxl");
+ if (IS_ERR(ocxl_class)) {
+ pr_err("Unable to create ocxl class\n");
+ unregister_chrdev_region(ocxl_dev, OCXL_NUM_MINORS);
+ return PTR_ERR(ocxl_class);
+ }
+
+ ocxl_class->devnode = ocxl_devnode;
+ return 0;
+}
+
+void ocxl_file_exit(void)
+{
+ class_destroy(ocxl_class);
+ unregister_chrdev_region(ocxl_dev, OCXL_NUM_MINORS);
+ idr_destroy(&minors_idr);
+}
diff --git a/drivers/misc/ocxl/link.c b/drivers/misc/ocxl/link.c
new file mode 100644
index 0000000000..c06c699c0e
--- /dev/null
+++ b/drivers/misc/ocxl/link.c
@@ -0,0 +1,779 @@
+// SPDX-License-Identifier: GPL-2.0+
+// Copyright 2017 IBM Corp.
+#include <linux/sched/mm.h>
+#include <linux/mutex.h>
+#include <linux/mm.h>
+#include <linux/mm_types.h>
+#include <linux/mmu_context.h>
+#include <linux/mmu_notifier.h>
+#include <linux/irqdomain.h>
+#include <asm/copro.h>
+#include <asm/pnv-ocxl.h>
+#include <asm/xive.h>
+#include <misc/ocxl.h>
+#include "ocxl_internal.h"
+#include "trace.h"
+
+
+#define SPA_PASID_BITS 15
+#define SPA_PASID_MAX ((1 << SPA_PASID_BITS) - 1)
+#define SPA_PE_MASK SPA_PASID_MAX
+#define SPA_SPA_SIZE_LOG 22 /* Each SPA is 4 Mb */
+
+#define SPA_CFG_SF (1ull << (63-0))
+#define SPA_CFG_TA (1ull << (63-1))
+#define SPA_CFG_HV (1ull << (63-3))
+#define SPA_CFG_UV (1ull << (63-4))
+#define SPA_CFG_XLAT_hpt (0ull << (63-6)) /* Hashed page table (HPT) mode */
+#define SPA_CFG_XLAT_roh (2ull << (63-6)) /* Radix on HPT mode */
+#define SPA_CFG_XLAT_ror (3ull << (63-6)) /* Radix on Radix mode */
+#define SPA_CFG_PR (1ull << (63-49))
+#define SPA_CFG_TC (1ull << (63-54))
+#define SPA_CFG_DR (1ull << (63-59))
+
+#define SPA_XSL_TF (1ull << (63-3)) /* Translation fault */
+#define SPA_XSL_S (1ull << (63-38)) /* Store operation */
+
+#define SPA_PE_VALID 0x80000000
+
+struct ocxl_link;
+
+struct pe_data {
+ struct mm_struct *mm;
+ /* callback to trigger when a translation fault occurs */
+ void (*xsl_err_cb)(void *data, u64 addr, u64 dsisr);
+ /* opaque pointer to be passed to the above callback */
+ void *xsl_err_data;
+ struct rcu_head rcu;
+ struct ocxl_link *link;
+ struct mmu_notifier mmu_notifier;
+};
+
+struct spa {
+ struct ocxl_process_element *spa_mem;
+ int spa_order;
+ struct mutex spa_lock;
+ struct radix_tree_root pe_tree; /* Maps PE handles to pe_data */
+ char *irq_name;
+ int virq;
+ void __iomem *reg_dsisr;
+ void __iomem *reg_dar;
+ void __iomem *reg_tfc;
+ void __iomem *reg_pe_handle;
+ /*
+ * The following field are used by the memory fault
+ * interrupt handler. We can only have one interrupt at a
+ * time. The NPU won't raise another interrupt until the
+ * previous one has been ack'd by writing to the TFC register
+ */
+ struct xsl_fault {
+ struct work_struct fault_work;
+ u64 pe;
+ u64 dsisr;
+ u64 dar;
+ struct pe_data pe_data;
+ } xsl_fault;
+};
+
+/*
+ * A opencapi link can be used be by several PCI functions. We have
+ * one link per device slot.
+ *
+ * A linked list of opencapi links should suffice, as there's a
+ * limited number of opencapi slots on a system and lookup is only
+ * done when the device is probed
+ */
+struct ocxl_link {
+ struct list_head list;
+ struct kref ref;
+ int domain;
+ int bus;
+ int dev;
+ void __iomem *arva; /* ATSD register virtual address */
+ spinlock_t atsd_lock; /* to serialize shootdowns */
+ atomic_t irq_available;
+ struct spa *spa;
+ void *platform_data;
+};
+static LIST_HEAD(links_list);
+static DEFINE_MUTEX(links_list_lock);
+
+enum xsl_response {
+ CONTINUE,
+ ADDRESS_ERROR,
+ RESTART,
+};
+
+
+static void read_irq(struct spa *spa, u64 *dsisr, u64 *dar, u64 *pe)
+{
+ u64 reg;
+
+ *dsisr = in_be64(spa->reg_dsisr);
+ *dar = in_be64(spa->reg_dar);
+ reg = in_be64(spa->reg_pe_handle);
+ *pe = reg & SPA_PE_MASK;
+}
+
+static void ack_irq(struct spa *spa, enum xsl_response r)
+{
+ u64 reg = 0;
+
+ /* continue is not supported */
+ if (r == RESTART)
+ reg = PPC_BIT(31);
+ else if (r == ADDRESS_ERROR)
+ reg = PPC_BIT(30);
+ else
+ WARN(1, "Invalid irq response %d\n", r);
+
+ if (reg) {
+ trace_ocxl_fault_ack(spa->spa_mem, spa->xsl_fault.pe,
+ spa->xsl_fault.dsisr, spa->xsl_fault.dar, reg);
+ out_be64(spa->reg_tfc, reg);
+ }
+}
+
+static void xsl_fault_handler_bh(struct work_struct *fault_work)
+{
+ vm_fault_t flt = 0;
+ unsigned long access, flags, inv_flags = 0;
+ enum xsl_response r;
+ struct xsl_fault *fault = container_of(fault_work, struct xsl_fault,
+ fault_work);
+ struct spa *spa = container_of(fault, struct spa, xsl_fault);
+
+ int rc;
+
+ /*
+ * We must release a reference on mm_users whenever exiting this
+ * function (taken in the memory fault interrupt handler)
+ */
+ rc = copro_handle_mm_fault(fault->pe_data.mm, fault->dar, fault->dsisr,
+ &flt);
+ if (rc) {
+ pr_debug("copro_handle_mm_fault failed: %d\n", rc);
+ if (fault->pe_data.xsl_err_cb) {
+ fault->pe_data.xsl_err_cb(
+ fault->pe_data.xsl_err_data,
+ fault->dar, fault->dsisr);
+ }
+ r = ADDRESS_ERROR;
+ goto ack;
+ }
+
+ if (!radix_enabled()) {
+ /*
+ * update_mmu_cache() will not have loaded the hash
+ * since current->trap is not a 0x400 or 0x300, so
+ * just call hash_page_mm() here.
+ */
+ access = _PAGE_PRESENT | _PAGE_READ;
+ if (fault->dsisr & SPA_XSL_S)
+ access |= _PAGE_WRITE;
+
+ if (get_region_id(fault->dar) != USER_REGION_ID)
+ access |= _PAGE_PRIVILEGED;
+
+ local_irq_save(flags);
+ hash_page_mm(fault->pe_data.mm, fault->dar, access, 0x300,
+ inv_flags);
+ local_irq_restore(flags);
+ }
+ r = RESTART;
+ack:
+ mmput(fault->pe_data.mm);
+ ack_irq(spa, r);
+}
+
+static irqreturn_t xsl_fault_handler(int irq, void *data)
+{
+ struct ocxl_link *link = (struct ocxl_link *) data;
+ struct spa *spa = link->spa;
+ u64 dsisr, dar, pe_handle;
+ struct pe_data *pe_data;
+ struct ocxl_process_element *pe;
+ int pid;
+ bool schedule = false;
+
+ read_irq(spa, &dsisr, &dar, &pe_handle);
+ trace_ocxl_fault(spa->spa_mem, pe_handle, dsisr, dar, -1);
+
+ WARN_ON(pe_handle > SPA_PE_MASK);
+ pe = spa->spa_mem + pe_handle;
+ pid = be32_to_cpu(pe->pid);
+ /* We could be reading all null values here if the PE is being
+ * removed while an interrupt kicks in. It's not supposed to
+ * happen if the driver notified the AFU to terminate the
+ * PASID, and the AFU waited for pending operations before
+ * acknowledging. But even if it happens, we won't find a
+ * memory context below and fail silently, so it should be ok.
+ */
+ if (!(dsisr & SPA_XSL_TF)) {
+ WARN(1, "Invalid xsl interrupt fault register %#llx\n", dsisr);
+ ack_irq(spa, ADDRESS_ERROR);
+ return IRQ_HANDLED;
+ }
+
+ rcu_read_lock();
+ pe_data = radix_tree_lookup(&spa->pe_tree, pe_handle);
+ if (!pe_data) {
+ /*
+ * Could only happen if the driver didn't notify the
+ * AFU about PASID termination before removing the PE,
+ * or the AFU didn't wait for all memory access to
+ * have completed.
+ *
+ * Either way, we fail early, but we shouldn't log an
+ * error message, as it is a valid (if unexpected)
+ * scenario
+ */
+ rcu_read_unlock();
+ pr_debug("Unknown mm context for xsl interrupt\n");
+ ack_irq(spa, ADDRESS_ERROR);
+ return IRQ_HANDLED;
+ }
+
+ if (!pe_data->mm) {
+ /*
+ * translation fault from a kernel context - an OpenCAPI
+ * device tried to access a bad kernel address
+ */
+ rcu_read_unlock();
+ pr_warn("Unresolved OpenCAPI xsl fault in kernel context\n");
+ ack_irq(spa, ADDRESS_ERROR);
+ return IRQ_HANDLED;
+ }
+ WARN_ON(pe_data->mm->context.id != pid);
+
+ if (mmget_not_zero(pe_data->mm)) {
+ spa->xsl_fault.pe = pe_handle;
+ spa->xsl_fault.dar = dar;
+ spa->xsl_fault.dsisr = dsisr;
+ spa->xsl_fault.pe_data = *pe_data;
+ schedule = true;
+ /* mm_users count released by bottom half */
+ }
+ rcu_read_unlock();
+ if (schedule)
+ schedule_work(&spa->xsl_fault.fault_work);
+ else
+ ack_irq(spa, ADDRESS_ERROR);
+ return IRQ_HANDLED;
+}
+
+static void unmap_irq_registers(struct spa *spa)
+{
+ pnv_ocxl_unmap_xsl_regs(spa->reg_dsisr, spa->reg_dar, spa->reg_tfc,
+ spa->reg_pe_handle);
+}
+
+static int map_irq_registers(struct pci_dev *dev, struct spa *spa)
+{
+ return pnv_ocxl_map_xsl_regs(dev, &spa->reg_dsisr, &spa->reg_dar,
+ &spa->reg_tfc, &spa->reg_pe_handle);
+}
+
+static int setup_xsl_irq(struct pci_dev *dev, struct ocxl_link *link)
+{
+ struct spa *spa = link->spa;
+ int rc;
+ int hwirq;
+
+ rc = pnv_ocxl_get_xsl_irq(dev, &hwirq);
+ if (rc)
+ return rc;
+
+ rc = map_irq_registers(dev, spa);
+ if (rc)
+ return rc;
+
+ spa->irq_name = kasprintf(GFP_KERNEL, "ocxl-xsl-%x-%x-%x",
+ link->domain, link->bus, link->dev);
+ if (!spa->irq_name) {
+ dev_err(&dev->dev, "Can't allocate name for xsl interrupt\n");
+ rc = -ENOMEM;
+ goto err_xsl;
+ }
+ /*
+ * At some point, we'll need to look into allowing a higher
+ * number of interrupts. Could we have an IRQ domain per link?
+ */
+ spa->virq = irq_create_mapping(NULL, hwirq);
+ if (!spa->virq) {
+ dev_err(&dev->dev,
+ "irq_create_mapping failed for translation interrupt\n");
+ rc = -EINVAL;
+ goto err_name;
+ }
+
+ dev_dbg(&dev->dev, "hwirq %d mapped to virq %d\n", hwirq, spa->virq);
+
+ rc = request_irq(spa->virq, xsl_fault_handler, 0, spa->irq_name,
+ link);
+ if (rc) {
+ dev_err(&dev->dev,
+ "request_irq failed for translation interrupt: %d\n",
+ rc);
+ rc = -EINVAL;
+ goto err_mapping;
+ }
+ return 0;
+
+err_mapping:
+ irq_dispose_mapping(spa->virq);
+err_name:
+ kfree(spa->irq_name);
+err_xsl:
+ unmap_irq_registers(spa);
+ return rc;
+}
+
+static void release_xsl_irq(struct ocxl_link *link)
+{
+ struct spa *spa = link->spa;
+
+ if (spa->virq) {
+ free_irq(spa->virq, link);
+ irq_dispose_mapping(spa->virq);
+ }
+ kfree(spa->irq_name);
+ unmap_irq_registers(spa);
+}
+
+static int alloc_spa(struct pci_dev *dev, struct ocxl_link *link)
+{
+ struct spa *spa;
+
+ spa = kzalloc(sizeof(struct spa), GFP_KERNEL);
+ if (!spa)
+ return -ENOMEM;
+
+ mutex_init(&spa->spa_lock);
+ INIT_RADIX_TREE(&spa->pe_tree, GFP_KERNEL);
+ INIT_WORK(&spa->xsl_fault.fault_work, xsl_fault_handler_bh);
+
+ spa->spa_order = SPA_SPA_SIZE_LOG - PAGE_SHIFT;
+ spa->spa_mem = (struct ocxl_process_element *)
+ __get_free_pages(GFP_KERNEL | __GFP_ZERO, spa->spa_order);
+ if (!spa->spa_mem) {
+ dev_err(&dev->dev, "Can't allocate Shared Process Area\n");
+ kfree(spa);
+ return -ENOMEM;
+ }
+ pr_debug("Allocated SPA for %x:%x:%x at %p\n", link->domain, link->bus,
+ link->dev, spa->spa_mem);
+
+ link->spa = spa;
+ return 0;
+}
+
+static void free_spa(struct ocxl_link *link)
+{
+ struct spa *spa = link->spa;
+
+ pr_debug("Freeing SPA for %x:%x:%x\n", link->domain, link->bus,
+ link->dev);
+
+ if (spa && spa->spa_mem) {
+ free_pages((unsigned long) spa->spa_mem, spa->spa_order);
+ kfree(spa);
+ link->spa = NULL;
+ }
+}
+
+static int alloc_link(struct pci_dev *dev, int PE_mask, struct ocxl_link **out_link)
+{
+ struct ocxl_link *link;
+ int rc;
+
+ link = kzalloc(sizeof(struct ocxl_link), GFP_KERNEL);
+ if (!link)
+ return -ENOMEM;
+
+ kref_init(&link->ref);
+ link->domain = pci_domain_nr(dev->bus);
+ link->bus = dev->bus->number;
+ link->dev = PCI_SLOT(dev->devfn);
+ atomic_set(&link->irq_available, MAX_IRQ_PER_LINK);
+ spin_lock_init(&link->atsd_lock);
+
+ rc = alloc_spa(dev, link);
+ if (rc)
+ goto err_free;
+
+ rc = setup_xsl_irq(dev, link);
+ if (rc)
+ goto err_spa;
+
+ /* platform specific hook */
+ rc = pnv_ocxl_spa_setup(dev, link->spa->spa_mem, PE_mask,
+ &link->platform_data);
+ if (rc)
+ goto err_xsl_irq;
+
+ /* if link->arva is not defeined, MMIO registers are not used to
+ * generate TLB invalidate. PowerBus snooping is enabled.
+ * Otherwise, PowerBus snooping is disabled. TLB Invalidates are
+ * initiated using MMIO registers.
+ */
+ pnv_ocxl_map_lpar(dev, mfspr(SPRN_LPID), 0, &link->arva);
+
+ *out_link = link;
+ return 0;
+
+err_xsl_irq:
+ release_xsl_irq(link);
+err_spa:
+ free_spa(link);
+err_free:
+ kfree(link);
+ return rc;
+}
+
+static void free_link(struct ocxl_link *link)
+{
+ release_xsl_irq(link);
+ free_spa(link);
+ kfree(link);
+}
+
+int ocxl_link_setup(struct pci_dev *dev, int PE_mask, void **link_handle)
+{
+ int rc = 0;
+ struct ocxl_link *link;
+
+ mutex_lock(&links_list_lock);
+ list_for_each_entry(link, &links_list, list) {
+ /* The functions of a device all share the same link */
+ if (link->domain == pci_domain_nr(dev->bus) &&
+ link->bus == dev->bus->number &&
+ link->dev == PCI_SLOT(dev->devfn)) {
+ kref_get(&link->ref);
+ *link_handle = link;
+ goto unlock;
+ }
+ }
+ rc = alloc_link(dev, PE_mask, &link);
+ if (rc)
+ goto unlock;
+
+ list_add(&link->list, &links_list);
+ *link_handle = link;
+unlock:
+ mutex_unlock(&links_list_lock);
+ return rc;
+}
+EXPORT_SYMBOL_GPL(ocxl_link_setup);
+
+static void release_xsl(struct kref *ref)
+{
+ struct ocxl_link *link = container_of(ref, struct ocxl_link, ref);
+
+ if (link->arva) {
+ pnv_ocxl_unmap_lpar(link->arva);
+ link->arva = NULL;
+ }
+
+ list_del(&link->list);
+ /* call platform code before releasing data */
+ pnv_ocxl_spa_release(link->platform_data);
+ free_link(link);
+}
+
+void ocxl_link_release(struct pci_dev *dev, void *link_handle)
+{
+ struct ocxl_link *link = (struct ocxl_link *) link_handle;
+
+ mutex_lock(&links_list_lock);
+ kref_put(&link->ref, release_xsl);
+ mutex_unlock(&links_list_lock);
+}
+EXPORT_SYMBOL_GPL(ocxl_link_release);
+
+static void arch_invalidate_secondary_tlbs(struct mmu_notifier *mn,
+ struct mm_struct *mm,
+ unsigned long start, unsigned long end)
+{
+ struct pe_data *pe_data = container_of(mn, struct pe_data, mmu_notifier);
+ struct ocxl_link *link = pe_data->link;
+ unsigned long addr, pid, page_size = PAGE_SIZE;
+
+ pid = mm->context.id;
+ trace_ocxl_mmu_notifier_range(start, end, pid);
+
+ spin_lock(&link->atsd_lock);
+ for (addr = start; addr < end; addr += page_size)
+ pnv_ocxl_tlb_invalidate(link->arva, pid, addr, page_size);
+ spin_unlock(&link->atsd_lock);
+}
+
+static const struct mmu_notifier_ops ocxl_mmu_notifier_ops = {
+ .arch_invalidate_secondary_tlbs = arch_invalidate_secondary_tlbs,
+};
+
+static u64 calculate_cfg_state(bool kernel)
+{
+ u64 state;
+
+ state = SPA_CFG_DR;
+ if (mfspr(SPRN_LPCR) & LPCR_TC)
+ state |= SPA_CFG_TC;
+ if (radix_enabled())
+ state |= SPA_CFG_XLAT_ror;
+ else
+ state |= SPA_CFG_XLAT_hpt;
+ state |= SPA_CFG_HV;
+ if (kernel) {
+ if (mfmsr() & MSR_SF)
+ state |= SPA_CFG_SF;
+ } else {
+ state |= SPA_CFG_PR;
+ if (!test_tsk_thread_flag(current, TIF_32BIT))
+ state |= SPA_CFG_SF;
+ }
+ return state;
+}
+
+int ocxl_link_add_pe(void *link_handle, int pasid, u32 pidr, u32 tidr,
+ u64 amr, u16 bdf, struct mm_struct *mm,
+ void (*xsl_err_cb)(void *data, u64 addr, u64 dsisr),
+ void *xsl_err_data)
+{
+ struct ocxl_link *link = (struct ocxl_link *) link_handle;
+ struct spa *spa = link->spa;
+ struct ocxl_process_element *pe;
+ int pe_handle, rc = 0;
+ struct pe_data *pe_data;
+
+ BUILD_BUG_ON(sizeof(struct ocxl_process_element) != 128);
+ if (pasid > SPA_PASID_MAX)
+ return -EINVAL;
+
+ mutex_lock(&spa->spa_lock);
+ pe_handle = pasid & SPA_PE_MASK;
+ pe = spa->spa_mem + pe_handle;
+
+ if (pe->software_state) {
+ rc = -EBUSY;
+ goto unlock;
+ }
+
+ pe_data = kmalloc(sizeof(*pe_data), GFP_KERNEL);
+ if (!pe_data) {
+ rc = -ENOMEM;
+ goto unlock;
+ }
+
+ pe_data->mm = mm;
+ pe_data->xsl_err_cb = xsl_err_cb;
+ pe_data->xsl_err_data = xsl_err_data;
+ pe_data->link = link;
+ pe_data->mmu_notifier.ops = &ocxl_mmu_notifier_ops;
+
+ memset(pe, 0, sizeof(struct ocxl_process_element));
+ pe->config_state = cpu_to_be64(calculate_cfg_state(pidr == 0));
+ pe->pasid = cpu_to_be32(pasid << (31 - 19));
+ pe->bdf = cpu_to_be16(bdf);
+ pe->lpid = cpu_to_be32(mfspr(SPRN_LPID));
+ pe->pid = cpu_to_be32(pidr);
+ pe->tid = cpu_to_be32(tidr);
+ pe->amr = cpu_to_be64(amr);
+ pe->software_state = cpu_to_be32(SPA_PE_VALID);
+
+ /*
+ * For user contexts, register a copro so that TLBIs are seen
+ * by the nest MMU. If we have a kernel context, TLBIs are
+ * already global.
+ */
+ if (mm) {
+ mm_context_add_copro(mm);
+ if (link->arva) {
+ /* Use MMIO registers for the TLB Invalidate
+ * operations.
+ */
+ trace_ocxl_init_mmu_notifier(pasid, mm->context.id);
+ mmu_notifier_register(&pe_data->mmu_notifier, mm);
+ }
+ }
+
+ /*
+ * Barrier is to make sure PE is visible in the SPA before it
+ * is used by the device. It also helps with the global TLBI
+ * invalidation
+ */
+ mb();
+ radix_tree_insert(&spa->pe_tree, pe_handle, pe_data);
+
+ /*
+ * The mm must stay valid for as long as the device uses it. We
+ * lower the count when the context is removed from the SPA.
+ *
+ * We grab mm_count (and not mm_users), as we don't want to
+ * end up in a circular dependency if a process mmaps its
+ * mmio, therefore incrementing the file ref count when
+ * calling mmap(), and forgets to unmap before exiting. In
+ * that scenario, when the kernel handles the death of the
+ * process, the file is not cleaned because unmap was not
+ * called, and the mm wouldn't be freed because we would still
+ * have a reference on mm_users. Incrementing mm_count solves
+ * the problem.
+ */
+ if (mm)
+ mmgrab(mm);
+ trace_ocxl_context_add(current->pid, spa->spa_mem, pasid, pidr, tidr);
+unlock:
+ mutex_unlock(&spa->spa_lock);
+ return rc;
+}
+EXPORT_SYMBOL_GPL(ocxl_link_add_pe);
+
+int ocxl_link_update_pe(void *link_handle, int pasid, __u16 tid)
+{
+ struct ocxl_link *link = (struct ocxl_link *) link_handle;
+ struct spa *spa = link->spa;
+ struct ocxl_process_element *pe;
+ int pe_handle, rc;
+
+ if (pasid > SPA_PASID_MAX)
+ return -EINVAL;
+
+ pe_handle = pasid & SPA_PE_MASK;
+ pe = spa->spa_mem + pe_handle;
+
+ mutex_lock(&spa->spa_lock);
+
+ pe->tid = cpu_to_be32(tid);
+
+ /*
+ * The barrier makes sure the PE is updated
+ * before we clear the NPU context cache below, so that the
+ * old PE cannot be reloaded erroneously.
+ */
+ mb();
+
+ /*
+ * hook to platform code
+ * On powerpc, the entry needs to be cleared from the context
+ * cache of the NPU.
+ */
+ rc = pnv_ocxl_spa_remove_pe_from_cache(link->platform_data, pe_handle);
+ WARN_ON(rc);
+
+ mutex_unlock(&spa->spa_lock);
+ return rc;
+}
+
+int ocxl_link_remove_pe(void *link_handle, int pasid)
+{
+ struct ocxl_link *link = (struct ocxl_link *) link_handle;
+ struct spa *spa = link->spa;
+ struct ocxl_process_element *pe;
+ struct pe_data *pe_data;
+ int pe_handle, rc;
+
+ if (pasid > SPA_PASID_MAX)
+ return -EINVAL;
+
+ /*
+ * About synchronization with our memory fault handler:
+ *
+ * Before removing the PE, the driver is supposed to have
+ * notified the AFU, which should have cleaned up and make
+ * sure the PASID is no longer in use, including pending
+ * interrupts. However, there's no way to be sure...
+ *
+ * We clear the PE and remove the context from our radix
+ * tree. From that point on, any new interrupt for that
+ * context will fail silently, which is ok. As mentioned
+ * above, that's not expected, but it could happen if the
+ * driver or AFU didn't do the right thing.
+ *
+ * There could still be a bottom half running, but we don't
+ * need to wait/flush, as it is managing a reference count on
+ * the mm it reads from the radix tree.
+ */
+ pe_handle = pasid & SPA_PE_MASK;
+ pe = spa->spa_mem + pe_handle;
+
+ mutex_lock(&spa->spa_lock);
+
+ if (!(be32_to_cpu(pe->software_state) & SPA_PE_VALID)) {
+ rc = -EINVAL;
+ goto unlock;
+ }
+
+ trace_ocxl_context_remove(current->pid, spa->spa_mem, pasid,
+ be32_to_cpu(pe->pid), be32_to_cpu(pe->tid));
+
+ memset(pe, 0, sizeof(struct ocxl_process_element));
+ /*
+ * The barrier makes sure the PE is removed from the SPA
+ * before we clear the NPU context cache below, so that the
+ * old PE cannot be reloaded erroneously.
+ */
+ mb();
+
+ /*
+ * hook to platform code
+ * On powerpc, the entry needs to be cleared from the context
+ * cache of the NPU.
+ */
+ rc = pnv_ocxl_spa_remove_pe_from_cache(link->platform_data, pe_handle);
+ WARN_ON(rc);
+
+ pe_data = radix_tree_delete(&spa->pe_tree, pe_handle);
+ if (!pe_data) {
+ WARN(1, "Couldn't find pe data when removing PE\n");
+ } else {
+ if (pe_data->mm) {
+ if (link->arva) {
+ trace_ocxl_release_mmu_notifier(pasid,
+ pe_data->mm->context.id);
+ mmu_notifier_unregister(&pe_data->mmu_notifier,
+ pe_data->mm);
+ spin_lock(&link->atsd_lock);
+ pnv_ocxl_tlb_invalidate(link->arva,
+ pe_data->mm->context.id,
+ 0ull,
+ PAGE_SIZE);
+ spin_unlock(&link->atsd_lock);
+ }
+ mm_context_remove_copro(pe_data->mm);
+ mmdrop(pe_data->mm);
+ }
+ kfree_rcu(pe_data, rcu);
+ }
+unlock:
+ mutex_unlock(&spa->spa_lock);
+ return rc;
+}
+EXPORT_SYMBOL_GPL(ocxl_link_remove_pe);
+
+int ocxl_link_irq_alloc(void *link_handle, int *hw_irq)
+{
+ struct ocxl_link *link = (struct ocxl_link *) link_handle;
+ int irq;
+
+ if (atomic_dec_if_positive(&link->irq_available) < 0)
+ return -ENOSPC;
+
+ irq = xive_native_alloc_irq();
+ if (!irq) {
+ atomic_inc(&link->irq_available);
+ return -ENXIO;
+ }
+
+ *hw_irq = irq;
+ return 0;
+}
+EXPORT_SYMBOL_GPL(ocxl_link_irq_alloc);
+
+void ocxl_link_free_irq(void *link_handle, int hw_irq)
+{
+ struct ocxl_link *link = (struct ocxl_link *) link_handle;
+
+ xive_native_free_irq(hw_irq);
+ atomic_inc(&link->irq_available);
+}
+EXPORT_SYMBOL_GPL(ocxl_link_free_irq);
diff --git a/drivers/misc/ocxl/main.c b/drivers/misc/ocxl/main.c
new file mode 100644
index 0000000000..ef73cf35dd
--- /dev/null
+++ b/drivers/misc/ocxl/main.c
@@ -0,0 +1,37 @@
+// SPDX-License-Identifier: GPL-2.0+
+// Copyright 2017 IBM Corp.
+#include <linux/module.h>
+#include <linux/pci.h>
+#include <asm/mmu.h>
+#include "ocxl_internal.h"
+
+static int __init init_ocxl(void)
+{
+ int rc = 0;
+
+ if (!tlbie_capable)
+ return -EINVAL;
+
+ rc = ocxl_file_init();
+ if (rc)
+ return rc;
+
+ rc = pci_register_driver(&ocxl_pci_driver);
+ if (rc) {
+ ocxl_file_exit();
+ return rc;
+ }
+ return 0;
+}
+
+static void exit_ocxl(void)
+{
+ pci_unregister_driver(&ocxl_pci_driver);
+ ocxl_file_exit();
+}
+
+module_init(init_ocxl);
+module_exit(exit_ocxl);
+
+MODULE_DESCRIPTION("Open Coherent Accelerator");
+MODULE_LICENSE("GPL");
diff --git a/drivers/misc/ocxl/mmio.c b/drivers/misc/ocxl/mmio.c
new file mode 100644
index 0000000000..aae713db4e
--- /dev/null
+++ b/drivers/misc/ocxl/mmio.c
@@ -0,0 +1,234 @@
+// SPDX-License-Identifier: GPL-2.0+
+// Copyright 2019 IBM Corp.
+#include <linux/sched/mm.h>
+#include "trace.h"
+#include "ocxl_internal.h"
+
+int ocxl_global_mmio_read32(struct ocxl_afu *afu, size_t offset,
+ enum ocxl_endian endian, u32 *val)
+{
+ if (offset > afu->config.global_mmio_size - 4)
+ return -EINVAL;
+
+#ifdef __BIG_ENDIAN__
+ if (endian == OCXL_HOST_ENDIAN)
+ endian = OCXL_BIG_ENDIAN;
+#endif
+
+ switch (endian) {
+ case OCXL_BIG_ENDIAN:
+ *val = readl_be((char *)afu->global_mmio_ptr + offset);
+ break;
+
+ default:
+ *val = readl((char *)afu->global_mmio_ptr + offset);
+ break;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(ocxl_global_mmio_read32);
+
+int ocxl_global_mmio_read64(struct ocxl_afu *afu, size_t offset,
+ enum ocxl_endian endian, u64 *val)
+{
+ if (offset > afu->config.global_mmio_size - 8)
+ return -EINVAL;
+
+#ifdef __BIG_ENDIAN__
+ if (endian == OCXL_HOST_ENDIAN)
+ endian = OCXL_BIG_ENDIAN;
+#endif
+
+ switch (endian) {
+ case OCXL_BIG_ENDIAN:
+ *val = readq_be((char *)afu->global_mmio_ptr + offset);
+ break;
+
+ default:
+ *val = readq((char *)afu->global_mmio_ptr + offset);
+ break;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(ocxl_global_mmio_read64);
+
+int ocxl_global_mmio_write32(struct ocxl_afu *afu, size_t offset,
+ enum ocxl_endian endian, u32 val)
+{
+ if (offset > afu->config.global_mmio_size - 4)
+ return -EINVAL;
+
+#ifdef __BIG_ENDIAN__
+ if (endian == OCXL_HOST_ENDIAN)
+ endian = OCXL_BIG_ENDIAN;
+#endif
+
+ switch (endian) {
+ case OCXL_BIG_ENDIAN:
+ writel_be(val, (char *)afu->global_mmio_ptr + offset);
+ break;
+
+ default:
+ writel(val, (char *)afu->global_mmio_ptr + offset);
+ break;
+ }
+
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(ocxl_global_mmio_write32);
+
+int ocxl_global_mmio_write64(struct ocxl_afu *afu, size_t offset,
+ enum ocxl_endian endian, u64 val)
+{
+ if (offset > afu->config.global_mmio_size - 8)
+ return -EINVAL;
+
+#ifdef __BIG_ENDIAN__
+ if (endian == OCXL_HOST_ENDIAN)
+ endian = OCXL_BIG_ENDIAN;
+#endif
+
+ switch (endian) {
+ case OCXL_BIG_ENDIAN:
+ writeq_be(val, (char *)afu->global_mmio_ptr + offset);
+ break;
+
+ default:
+ writeq(val, (char *)afu->global_mmio_ptr + offset);
+ break;
+ }
+
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(ocxl_global_mmio_write64);
+
+int ocxl_global_mmio_set32(struct ocxl_afu *afu, size_t offset,
+ enum ocxl_endian endian, u32 mask)
+{
+ u32 tmp;
+
+ if (offset > afu->config.global_mmio_size - 4)
+ return -EINVAL;
+
+#ifdef __BIG_ENDIAN__
+ if (endian == OCXL_HOST_ENDIAN)
+ endian = OCXL_BIG_ENDIAN;
+#endif
+
+ switch (endian) {
+ case OCXL_BIG_ENDIAN:
+ tmp = readl_be((char *)afu->global_mmio_ptr + offset);
+ tmp |= mask;
+ writel_be(tmp, (char *)afu->global_mmio_ptr + offset);
+ break;
+
+ default:
+ tmp = readl((char *)afu->global_mmio_ptr + offset);
+ tmp |= mask;
+ writel(tmp, (char *)afu->global_mmio_ptr + offset);
+ break;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(ocxl_global_mmio_set32);
+
+int ocxl_global_mmio_set64(struct ocxl_afu *afu, size_t offset,
+ enum ocxl_endian endian, u64 mask)
+{
+ u64 tmp;
+
+ if (offset > afu->config.global_mmio_size - 8)
+ return -EINVAL;
+
+#ifdef __BIG_ENDIAN__
+ if (endian == OCXL_HOST_ENDIAN)
+ endian = OCXL_BIG_ENDIAN;
+#endif
+
+ switch (endian) {
+ case OCXL_BIG_ENDIAN:
+ tmp = readq_be((char *)afu->global_mmio_ptr + offset);
+ tmp |= mask;
+ writeq_be(tmp, (char *)afu->global_mmio_ptr + offset);
+ break;
+
+ default:
+ tmp = readq((char *)afu->global_mmio_ptr + offset);
+ tmp |= mask;
+ writeq(tmp, (char *)afu->global_mmio_ptr + offset);
+ break;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(ocxl_global_mmio_set64);
+
+int ocxl_global_mmio_clear32(struct ocxl_afu *afu, size_t offset,
+ enum ocxl_endian endian, u32 mask)
+{
+ u32 tmp;
+
+ if (offset > afu->config.global_mmio_size - 4)
+ return -EINVAL;
+
+#ifdef __BIG_ENDIAN__
+ if (endian == OCXL_HOST_ENDIAN)
+ endian = OCXL_BIG_ENDIAN;
+#endif
+
+ switch (endian) {
+ case OCXL_BIG_ENDIAN:
+ tmp = readl_be((char *)afu->global_mmio_ptr + offset);
+ tmp &= ~mask;
+ writel_be(tmp, (char *)afu->global_mmio_ptr + offset);
+ break;
+
+ default:
+ tmp = readl((char *)afu->global_mmio_ptr + offset);
+ tmp &= ~mask;
+ writel(tmp, (char *)afu->global_mmio_ptr + offset);
+ break;
+ }
+
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(ocxl_global_mmio_clear32);
+
+int ocxl_global_mmio_clear64(struct ocxl_afu *afu, size_t offset,
+ enum ocxl_endian endian, u64 mask)
+{
+ u64 tmp;
+
+ if (offset > afu->config.global_mmio_size - 8)
+ return -EINVAL;
+
+#ifdef __BIG_ENDIAN__
+ if (endian == OCXL_HOST_ENDIAN)
+ endian = OCXL_BIG_ENDIAN;
+#endif
+
+ switch (endian) {
+ case OCXL_BIG_ENDIAN:
+ tmp = readq_be((char *)afu->global_mmio_ptr + offset);
+ tmp &= ~mask;
+ writeq_be(tmp, (char *)afu->global_mmio_ptr + offset);
+ break;
+
+ default:
+ tmp = readq((char *)afu->global_mmio_ptr + offset);
+ tmp &= ~mask;
+ writeq(tmp, (char *)afu->global_mmio_ptr + offset);
+ break;
+ }
+
+ writeq(tmp, (char *)afu->global_mmio_ptr + offset);
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(ocxl_global_mmio_clear64);
diff --git a/drivers/misc/ocxl/ocxl_internal.h b/drivers/misc/ocxl/ocxl_internal.h
new file mode 100644
index 0000000000..10125a22d5
--- /dev/null
+++ b/drivers/misc/ocxl/ocxl_internal.h
@@ -0,0 +1,154 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+// Copyright 2017 IBM Corp.
+#ifndef _OCXL_INTERNAL_H_
+#define _OCXL_INTERNAL_H_
+
+#include <linux/pci.h>
+#include <linux/cdev.h>
+#include <linux/list.h>
+#include <misc/ocxl.h>
+
+#define MAX_IRQ_PER_LINK 2000
+#define MAX_IRQ_PER_CONTEXT MAX_IRQ_PER_LINK
+
+extern struct pci_driver ocxl_pci_driver;
+
+struct ocxl_fn {
+ struct device dev;
+ int bar_used[3];
+ struct ocxl_fn_config config;
+ struct list_head afu_list;
+ int pasid_base;
+ int actag_base;
+ int actag_enabled;
+ int actag_supported;
+ struct list_head pasid_list;
+ struct list_head actag_list;
+ void *link;
+};
+
+struct ocxl_file_info {
+ struct ocxl_afu *afu;
+ struct device dev;
+ struct cdev cdev;
+ struct bin_attribute attr_global_mmio;
+};
+
+struct ocxl_afu {
+ struct kref kref;
+ struct ocxl_fn *fn;
+ struct list_head list;
+ struct ocxl_afu_config config;
+ int pasid_base;
+ int pasid_count; /* opened contexts */
+ int pasid_max; /* maximum number of contexts */
+ int actag_base;
+ int actag_enabled;
+ struct mutex contexts_lock;
+ struct idr contexts_idr;
+ struct mutex afu_control_lock;
+ u64 global_mmio_start;
+ u64 irq_base_offset;
+ void __iomem *global_mmio_ptr;
+ u64 pp_mmio_start;
+ void *private;
+};
+
+enum ocxl_context_status {
+ CLOSED,
+ OPENED,
+ ATTACHED,
+};
+
+// Contains metadata about a translation fault
+struct ocxl_xsl_error {
+ u64 addr; // The address that triggered the fault
+ u64 dsisr; // the value of the dsisr register
+ u64 count; // The number of times this fault has been triggered
+};
+
+struct ocxl_context {
+ struct ocxl_afu *afu;
+ int pasid;
+ struct mutex status_mutex;
+ enum ocxl_context_status status;
+ struct address_space *mapping;
+ struct mutex mapping_lock;
+ wait_queue_head_t events_wq;
+ struct mutex xsl_error_lock;
+ struct ocxl_xsl_error xsl_error;
+ struct mutex irq_lock;
+ struct idr irq_idr;
+ u16 tidr; // Thread ID used for P9 wait implementation
+};
+
+struct ocxl_process_element {
+ __be64 config_state;
+ __be32 pasid;
+ __be16 bdf;
+ __be16 reserved1;
+ __be32 reserved2[9];
+ __be32 lpid;
+ __be32 tid;
+ __be32 pid;
+ __be32 reserved3[10];
+ __be64 amr;
+ __be32 reserved4[3];
+ __be32 software_state;
+};
+
+int ocxl_create_cdev(struct ocxl_afu *afu);
+void ocxl_destroy_cdev(struct ocxl_afu *afu);
+int ocxl_file_register_afu(struct ocxl_afu *afu);
+void ocxl_file_unregister_afu(struct ocxl_afu *afu);
+
+int ocxl_file_init(void);
+void ocxl_file_exit(void);
+
+int ocxl_pasid_afu_alloc(struct ocxl_fn *fn, u32 size);
+void ocxl_pasid_afu_free(struct ocxl_fn *fn, u32 start, u32 size);
+int ocxl_actag_afu_alloc(struct ocxl_fn *fn, u32 size);
+void ocxl_actag_afu_free(struct ocxl_fn *fn, u32 start, u32 size);
+
+/*
+ * Get the max PASID value that can be used by the function
+ */
+int ocxl_config_get_pasid_info(struct pci_dev *dev, int *count);
+
+/*
+ * Control whether the FPGA is reloaded on a link reset
+ */
+int ocxl_config_get_reset_reload(struct pci_dev *dev, int *val);
+int ocxl_config_set_reset_reload(struct pci_dev *dev, int val);
+
+/*
+ * Check if an AFU index is valid for the given function.
+ *
+ * AFU indexes can be sparse, so a driver should check all indexes up
+ * to the maximum found in the function description
+ */
+int ocxl_config_check_afu_index(struct pci_dev *dev,
+ struct ocxl_fn_config *fn, int afu_idx);
+
+/**
+ * ocxl_link_update_pe() - Update values within a Process Element
+ * @link_handle: the link handle associated with the process element
+ * @pasid: the PASID for the AFU context
+ * @tid: the new thread id for the process element
+ *
+ * Returns 0 on success
+ */
+int ocxl_link_update_pe(void *link_handle, int pasid, __u16 tid);
+
+int ocxl_context_mmap(struct ocxl_context *ctx,
+ struct vm_area_struct *vma);
+void ocxl_context_detach_all(struct ocxl_afu *afu);
+
+int ocxl_sysfs_register_afu(struct ocxl_file_info *info);
+void ocxl_sysfs_unregister_afu(struct ocxl_file_info *info);
+
+int ocxl_irq_offset_to_id(struct ocxl_context *ctx, u64 offset);
+u64 ocxl_irq_id_to_offset(struct ocxl_context *ctx, int irq_id);
+void ocxl_afu_irq_free_all(struct ocxl_context *ctx);
+
+#endif /* _OCXL_INTERNAL_H_ */
diff --git a/drivers/misc/ocxl/pasid.c b/drivers/misc/ocxl/pasid.c
new file mode 100644
index 0000000000..d14cb56e69
--- /dev/null
+++ b/drivers/misc/ocxl/pasid.c
@@ -0,0 +1,107 @@
+// SPDX-License-Identifier: GPL-2.0+
+// Copyright 2017 IBM Corp.
+#include "ocxl_internal.h"
+
+
+struct id_range {
+ struct list_head list;
+ u32 start;
+ u32 end;
+};
+
+#ifdef DEBUG
+static void dump_list(struct list_head *head, char *type_str)
+{
+ struct id_range *cur;
+
+ pr_debug("%s ranges allocated:\n", type_str);
+ list_for_each_entry(cur, head, list) {
+ pr_debug("Range %d->%d\n", cur->start, cur->end);
+ }
+}
+#endif
+
+static int range_alloc(struct list_head *head, u32 size, int max_id,
+ char *type_str)
+{
+ struct list_head *pos;
+ struct id_range *cur, *new;
+ int rc, last_end;
+
+ new = kmalloc(sizeof(struct id_range), GFP_KERNEL);
+ if (!new)
+ return -ENOMEM;
+
+ pos = head;
+ last_end = -1;
+ list_for_each_entry(cur, head, list) {
+ if ((cur->start - last_end) > size)
+ break;
+ last_end = cur->end;
+ pos = &cur->list;
+ }
+
+ new->start = last_end + 1;
+ new->end = new->start + size - 1;
+
+ if (new->end > max_id) {
+ kfree(new);
+ rc = -ENOSPC;
+ } else {
+ list_add(&new->list, pos);
+ rc = new->start;
+ }
+
+#ifdef DEBUG
+ dump_list(head, type_str);
+#endif
+ return rc;
+}
+
+static void range_free(struct list_head *head, u32 start, u32 size,
+ char *type_str)
+{
+ bool found = false;
+ struct id_range *cur, *tmp;
+
+ list_for_each_entry_safe(cur, tmp, head, list) {
+ if (cur->start == start && cur->end == (start + size - 1)) {
+ found = true;
+ list_del(&cur->list);
+ kfree(cur);
+ break;
+ }
+ }
+ WARN_ON(!found);
+#ifdef DEBUG
+ dump_list(head, type_str);
+#endif
+}
+
+int ocxl_pasid_afu_alloc(struct ocxl_fn *fn, u32 size)
+{
+ int max_pasid;
+
+ if (fn->config.max_pasid_log < 0)
+ return -ENOSPC;
+ max_pasid = 1 << fn->config.max_pasid_log;
+ return range_alloc(&fn->pasid_list, size, max_pasid, "afu pasid");
+}
+
+void ocxl_pasid_afu_free(struct ocxl_fn *fn, u32 start, u32 size)
+{
+ return range_free(&fn->pasid_list, start, size, "afu pasid");
+}
+
+int ocxl_actag_afu_alloc(struct ocxl_fn *fn, u32 size)
+{
+ int max_actag;
+
+ max_actag = fn->actag_enabled;
+ return range_alloc(&fn->actag_list, size, max_actag, "afu actag");
+}
+
+void ocxl_actag_afu_free(struct ocxl_fn *fn, u32 start, u32 size)
+{
+ return range_free(&fn->actag_list, start, size, "afu actag");
+}
diff --git a/drivers/misc/ocxl/pci.c b/drivers/misc/ocxl/pci.c
new file mode 100644
index 0000000000..cb920aa88d
--- /dev/null
+++ b/drivers/misc/ocxl/pci.c
@@ -0,0 +1,66 @@
+// SPDX-License-Identifier: GPL-2.0+
+// Copyright 2019 IBM Corp.
+#include <linux/module.h>
+#include "ocxl_internal.h"
+
+/*
+ * Any opencapi device which wants to use this 'generic' driver should
+ * use the 0x062B device ID. Vendors should define the subsystem
+ * vendor/device ID to help differentiate devices.
+ */
+static const struct pci_device_id ocxl_pci_tbl[] = {
+ { PCI_DEVICE(PCI_VENDOR_ID_IBM, 0x062B), },
+ { }
+};
+MODULE_DEVICE_TABLE(pci, ocxl_pci_tbl);
+
+static int ocxl_probe(struct pci_dev *dev, const struct pci_device_id *id)
+{
+ int rc;
+ struct ocxl_afu *afu, *tmp;
+ struct ocxl_fn *fn;
+ struct list_head *afu_list;
+
+ fn = ocxl_function_open(dev);
+ if (IS_ERR(fn))
+ return PTR_ERR(fn);
+
+ pci_set_drvdata(dev, fn);
+
+ afu_list = ocxl_function_afu_list(fn);
+
+ list_for_each_entry_safe(afu, tmp, afu_list, list) {
+ // Cleanup handled within ocxl_file_register_afu()
+ rc = ocxl_file_register_afu(afu);
+ if (rc) {
+ dev_err(&dev->dev, "Failed to register AFU '%s' index %d",
+ afu->config.name, afu->config.idx);
+ }
+ }
+
+ return 0;
+}
+
+static void ocxl_remove(struct pci_dev *dev)
+{
+ struct ocxl_fn *fn;
+ struct ocxl_afu *afu;
+ struct list_head *afu_list;
+
+ fn = pci_get_drvdata(dev);
+ afu_list = ocxl_function_afu_list(fn);
+
+ list_for_each_entry(afu, afu_list, list) {
+ ocxl_file_unregister_afu(afu);
+ }
+
+ ocxl_function_close(fn);
+}
+
+struct pci_driver ocxl_pci_driver = {
+ .name = "ocxl",
+ .id_table = ocxl_pci_tbl,
+ .probe = ocxl_probe,
+ .remove = ocxl_remove,
+ .shutdown = ocxl_remove,
+};
diff --git a/drivers/misc/ocxl/sysfs.c b/drivers/misc/ocxl/sysfs.c
new file mode 100644
index 0000000000..405180d47d
--- /dev/null
+++ b/drivers/misc/ocxl/sysfs.c
@@ -0,0 +1,186 @@
+// SPDX-License-Identifier: GPL-2.0+
+// Copyright 2017 IBM Corp.
+#include <linux/sysfs.h>
+#include "ocxl_internal.h"
+
+static inline struct ocxl_afu *to_afu(struct device *device)
+{
+ struct ocxl_file_info *info = container_of(device, struct ocxl_file_info, dev);
+
+ return info->afu;
+}
+
+static ssize_t global_mmio_size_show(struct device *device,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct ocxl_afu *afu = to_afu(device);
+
+ return scnprintf(buf, PAGE_SIZE, "%d\n",
+ afu->config.global_mmio_size);
+}
+
+static ssize_t pp_mmio_size_show(struct device *device,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct ocxl_afu *afu = to_afu(device);
+
+ return scnprintf(buf, PAGE_SIZE, "%d\n",
+ afu->config.pp_mmio_stride);
+}
+
+static ssize_t afu_version_show(struct device *device,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct ocxl_afu *afu = to_afu(device);
+
+ return scnprintf(buf, PAGE_SIZE, "%hhu:%hhu\n",
+ afu->config.version_major,
+ afu->config.version_minor);
+}
+
+static ssize_t contexts_show(struct device *device,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct ocxl_afu *afu = to_afu(device);
+
+ return scnprintf(buf, PAGE_SIZE, "%d/%d\n",
+ afu->pasid_count, afu->pasid_max);
+}
+
+static ssize_t reload_on_reset_show(struct device *device,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct ocxl_afu *afu = to_afu(device);
+ struct ocxl_fn *fn = afu->fn;
+ struct pci_dev *pci_dev = to_pci_dev(fn->dev.parent);
+ int val;
+
+ if (ocxl_config_get_reset_reload(pci_dev, &val))
+ return scnprintf(buf, PAGE_SIZE, "unavailable\n");
+
+ return scnprintf(buf, PAGE_SIZE, "%d\n", val);
+}
+
+static ssize_t reload_on_reset_store(struct device *device,
+ struct device_attribute *attr,
+ const char *buf, size_t count)
+{
+ struct ocxl_afu *afu = to_afu(device);
+ struct ocxl_fn *fn = afu->fn;
+ struct pci_dev *pci_dev = to_pci_dev(fn->dev.parent);
+ int rc, val;
+
+ rc = kstrtoint(buf, 0, &val);
+ if (rc || (val != 0 && val != 1))
+ return -EINVAL;
+
+ if (ocxl_config_set_reset_reload(pci_dev, val))
+ return -ENODEV;
+
+ return count;
+}
+
+static struct device_attribute afu_attrs[] = {
+ __ATTR_RO(global_mmio_size),
+ __ATTR_RO(pp_mmio_size),
+ __ATTR_RO(afu_version),
+ __ATTR_RO(contexts),
+ __ATTR_RW(reload_on_reset),
+};
+
+static ssize_t global_mmio_read(struct file *filp, struct kobject *kobj,
+ struct bin_attribute *bin_attr, char *buf,
+ loff_t off, size_t count)
+{
+ struct ocxl_afu *afu = to_afu(kobj_to_dev(kobj));
+
+ if (count == 0 || off < 0 ||
+ off >= afu->config.global_mmio_size)
+ return 0;
+ memcpy_fromio(buf, afu->global_mmio_ptr + off, count);
+ return count;
+}
+
+static vm_fault_t global_mmio_fault(struct vm_fault *vmf)
+{
+ struct vm_area_struct *vma = vmf->vma;
+ struct ocxl_afu *afu = vma->vm_private_data;
+ unsigned long offset;
+
+ if (vmf->pgoff >= (afu->config.global_mmio_size >> PAGE_SHIFT))
+ return VM_FAULT_SIGBUS;
+
+ offset = vmf->pgoff;
+ offset += (afu->global_mmio_start >> PAGE_SHIFT);
+ return vmf_insert_pfn(vma, vmf->address, offset);
+}
+
+static const struct vm_operations_struct global_mmio_vmops = {
+ .fault = global_mmio_fault,
+};
+
+static int global_mmio_mmap(struct file *filp, struct kobject *kobj,
+ struct bin_attribute *bin_attr,
+ struct vm_area_struct *vma)
+{
+ struct ocxl_afu *afu = to_afu(kobj_to_dev(kobj));
+
+ if ((vma_pages(vma) + vma->vm_pgoff) >
+ (afu->config.global_mmio_size >> PAGE_SHIFT))
+ return -EINVAL;
+
+ vm_flags_set(vma, VM_IO | VM_PFNMAP);
+ vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
+ vma->vm_ops = &global_mmio_vmops;
+ vma->vm_private_data = afu;
+ return 0;
+}
+
+int ocxl_sysfs_register_afu(struct ocxl_file_info *info)
+{
+ int i, rc;
+
+ for (i = 0; i < ARRAY_SIZE(afu_attrs); i++) {
+ rc = device_create_file(&info->dev, &afu_attrs[i]);
+ if (rc)
+ goto err;
+ }
+
+ sysfs_attr_init(&info->attr_global_mmio.attr);
+ info->attr_global_mmio.attr.name = "global_mmio_area";
+ info->attr_global_mmio.attr.mode = 0600;
+ info->attr_global_mmio.size = info->afu->config.global_mmio_size;
+ info->attr_global_mmio.read = global_mmio_read;
+ info->attr_global_mmio.mmap = global_mmio_mmap;
+ rc = device_create_bin_file(&info->dev, &info->attr_global_mmio);
+ if (rc) {
+ dev_err(&info->dev, "Unable to create global mmio attr for afu: %d\n", rc);
+ goto err;
+ }
+
+ return 0;
+
+err:
+ for (i--; i >= 0; i--)
+ device_remove_file(&info->dev, &afu_attrs[i]);
+
+ return rc;
+}
+
+void ocxl_sysfs_unregister_afu(struct ocxl_file_info *info)
+{
+ int i;
+
+ /*
+ * device_remove_bin_file is safe to call if the file is not added as
+ * the files are removed by name, and early exit if not found
+ */
+ for (i = 0; i < ARRAY_SIZE(afu_attrs); i++)
+ device_remove_file(&info->dev, &afu_attrs[i]);
+ device_remove_bin_file(&info->dev, &info->attr_global_mmio);
+}
diff --git a/drivers/misc/ocxl/trace.c b/drivers/misc/ocxl/trace.c
new file mode 100644
index 0000000000..1e69470496
--- /dev/null
+++ b/drivers/misc/ocxl/trace.c
@@ -0,0 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0+
+// Copyright 2017 IBM Corp.
+#ifndef __CHECKER__
+#define CREATE_TRACE_POINTS
+#include "trace.h"
+#endif
diff --git a/drivers/misc/ocxl/trace.h b/drivers/misc/ocxl/trace.h
new file mode 100644
index 0000000000..a33a5094ff
--- /dev/null
+++ b/drivers/misc/ocxl/trace.h
@@ -0,0 +1,242 @@
+/* SPDX-License-Identifier: GPL-2.0+ */
+// Copyright 2017 IBM Corp.
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM ocxl
+
+#if !defined(_TRACE_OCXL_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_OCXL_H
+
+#include <linux/tracepoint.h>
+
+
+TRACE_EVENT(ocxl_mmu_notifier_range,
+ TP_PROTO(unsigned long start, unsigned long end, unsigned long pidr),
+ TP_ARGS(start, end, pidr),
+
+ TP_STRUCT__entry(
+ __field(unsigned long, start)
+ __field(unsigned long, end)
+ __field(unsigned long, pidr)
+ ),
+
+ TP_fast_assign(
+ __entry->start = start;
+ __entry->end = end;
+ __entry->pidr = pidr;
+ ),
+
+ TP_printk("start=0x%lx end=0x%lx pidr=0x%lx",
+ __entry->start,
+ __entry->end,
+ __entry->pidr
+ )
+);
+
+TRACE_EVENT(ocxl_init_mmu_notifier,
+ TP_PROTO(int pasid, unsigned long pidr),
+ TP_ARGS(pasid, pidr),
+
+ TP_STRUCT__entry(
+ __field(int, pasid)
+ __field(unsigned long, pidr)
+ ),
+
+ TP_fast_assign(
+ __entry->pasid = pasid;
+ __entry->pidr = pidr;
+ ),
+
+ TP_printk("pasid=%d, pidr=0x%lx",
+ __entry->pasid,
+ __entry->pidr
+ )
+);
+
+TRACE_EVENT(ocxl_release_mmu_notifier,
+ TP_PROTO(int pasid, unsigned long pidr),
+ TP_ARGS(pasid, pidr),
+
+ TP_STRUCT__entry(
+ __field(int, pasid)
+ __field(unsigned long, pidr)
+ ),
+
+ TP_fast_assign(
+ __entry->pasid = pasid;
+ __entry->pidr = pidr;
+ ),
+
+ TP_printk("pasid=%d, pidr=0x%lx",
+ __entry->pasid,
+ __entry->pidr
+ )
+);
+
+DECLARE_EVENT_CLASS(ocxl_context,
+ TP_PROTO(pid_t pid, void *spa, int pasid, u32 pidr, u32 tidr),
+ TP_ARGS(pid, spa, pasid, pidr, tidr),
+
+ TP_STRUCT__entry(
+ __field(pid_t, pid)
+ __field(void*, spa)
+ __field(int, pasid)
+ __field(u32, pidr)
+ __field(u32, tidr)
+ ),
+
+ TP_fast_assign(
+ __entry->pid = pid;
+ __entry->spa = spa;
+ __entry->pasid = pasid;
+ __entry->pidr = pidr;
+ __entry->tidr = tidr;
+ ),
+
+ TP_printk("linux pid=%d spa=0x%p pasid=0x%x pidr=0x%x tidr=0x%x",
+ __entry->pid,
+ __entry->spa,
+ __entry->pasid,
+ __entry->pidr,
+ __entry->tidr
+ )
+);
+
+DEFINE_EVENT(ocxl_context, ocxl_context_add,
+ TP_PROTO(pid_t pid, void *spa, int pasid, u32 pidr, u32 tidr),
+ TP_ARGS(pid, spa, pasid, pidr, tidr)
+);
+
+DEFINE_EVENT(ocxl_context, ocxl_context_remove,
+ TP_PROTO(pid_t pid, void *spa, int pasid, u32 pidr, u32 tidr),
+ TP_ARGS(pid, spa, pasid, pidr, tidr)
+);
+
+TRACE_EVENT(ocxl_terminate_pasid,
+ TP_PROTO(int pasid, int rc),
+ TP_ARGS(pasid, rc),
+
+ TP_STRUCT__entry(
+ __field(int, pasid)
+ __field(int, rc)
+ ),
+
+ TP_fast_assign(
+ __entry->pasid = pasid;
+ __entry->rc = rc;
+ ),
+
+ TP_printk("pasid=0x%x rc=%d",
+ __entry->pasid,
+ __entry->rc
+ )
+);
+
+DECLARE_EVENT_CLASS(ocxl_fault_handler,
+ TP_PROTO(void *spa, u64 pe, u64 dsisr, u64 dar, u64 tfc),
+ TP_ARGS(spa, pe, dsisr, dar, tfc),
+
+ TP_STRUCT__entry(
+ __field(void *, spa)
+ __field(u64, pe)
+ __field(u64, dsisr)
+ __field(u64, dar)
+ __field(u64, tfc)
+ ),
+
+ TP_fast_assign(
+ __entry->spa = spa;
+ __entry->pe = pe;
+ __entry->dsisr = dsisr;
+ __entry->dar = dar;
+ __entry->tfc = tfc;
+ ),
+
+ TP_printk("spa=%p pe=0x%llx dsisr=0x%llx dar=0x%llx tfc=0x%llx",
+ __entry->spa,
+ __entry->pe,
+ __entry->dsisr,
+ __entry->dar,
+ __entry->tfc
+ )
+);
+
+DEFINE_EVENT(ocxl_fault_handler, ocxl_fault,
+ TP_PROTO(void *spa, u64 pe, u64 dsisr, u64 dar, u64 tfc),
+ TP_ARGS(spa, pe, dsisr, dar, tfc)
+);
+
+DEFINE_EVENT(ocxl_fault_handler, ocxl_fault_ack,
+ TP_PROTO(void *spa, u64 pe, u64 dsisr, u64 dar, u64 tfc),
+ TP_ARGS(spa, pe, dsisr, dar, tfc)
+);
+
+TRACE_EVENT(ocxl_afu_irq_alloc,
+ TP_PROTO(int pasid, int irq_id, unsigned int virq, int hw_irq),
+ TP_ARGS(pasid, irq_id, virq, hw_irq),
+
+ TP_STRUCT__entry(
+ __field(int, pasid)
+ __field(int, irq_id)
+ __field(unsigned int, virq)
+ __field(int, hw_irq)
+ ),
+
+ TP_fast_assign(
+ __entry->pasid = pasid;
+ __entry->irq_id = irq_id;
+ __entry->virq = virq;
+ __entry->hw_irq = hw_irq;
+ ),
+
+ TP_printk("pasid=0x%x irq_id=%d virq=%u hw_irq=%d",
+ __entry->pasid,
+ __entry->irq_id,
+ __entry->virq,
+ __entry->hw_irq
+ )
+);
+
+TRACE_EVENT(ocxl_afu_irq_free,
+ TP_PROTO(int pasid, int irq_id),
+ TP_ARGS(pasid, irq_id),
+
+ TP_STRUCT__entry(
+ __field(int, pasid)
+ __field(int, irq_id)
+ ),
+
+ TP_fast_assign(
+ __entry->pasid = pasid;
+ __entry->irq_id = irq_id;
+ ),
+
+ TP_printk("pasid=0x%x irq_id=%d",
+ __entry->pasid,
+ __entry->irq_id
+ )
+);
+
+TRACE_EVENT(ocxl_afu_irq_receive,
+ TP_PROTO(int virq),
+ TP_ARGS(virq),
+
+ TP_STRUCT__entry(
+ __field(int, virq)
+ ),
+
+ TP_fast_assign(
+ __entry->virq = virq;
+ ),
+
+ TP_printk("virq=%d",
+ __entry->virq
+ )
+);
+
+#endif /* _TRACE_OCXL_H */
+
+/* This part must be outside protection */
+#undef TRACE_INCLUDE_PATH
+#define TRACE_INCLUDE_PATH .
+#define TRACE_INCLUDE_FILE trace
+#include <trace/define_trace.h>