diff options
Diffstat (limited to 'drivers/misc/ocxl')
| -rw-r--r-- | drivers/misc/ocxl/Makefile | 1 | ||||
| -rw-r--r-- | drivers/misc/ocxl/core.c | 517 | ||||
| -rw-r--r-- | drivers/misc/ocxl/ocxl_internal.h | 5 | ||||
| -rw-r--r-- | drivers/misc/ocxl/pci.c | 519 |
4 files changed, 524 insertions, 518 deletions
diff --git a/drivers/misc/ocxl/Makefile b/drivers/misc/ocxl/Makefile index 5229dcda8297..bc4e39bfda7b 100644 --- a/drivers/misc/ocxl/Makefile +++ b/drivers/misc/ocxl/Makefile @@ -3,6 +3,7 @@ ccflags-$(CONFIG_PPC_WERROR) += -Werror ocxl-y += main.o pci.o config.o file.o pasid.o ocxl-y += link.o context.o afu_irq.o sysfs.o trace.o +ocxl-y += core.o obj-$(CONFIG_OCXL) += ocxl.o # For tracepoints to include our trace.h from tracepoint infrastructure: diff --git a/drivers/misc/ocxl/core.c b/drivers/misc/ocxl/core.c new file mode 100644 index 000000000000..1a4411b72d35 --- /dev/null +++ b/drivers/misc/ocxl/core.c @@ -0,0 +1,517 @@ +// 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); +} + +struct ocxl_afu *ocxl_afu_get(struct ocxl_afu *afu) +{ + return (get_device(&afu->dev) == NULL) ? NULL : afu; +} + +void ocxl_afu_put(struct ocxl_afu *afu) +{ + put_device(&afu->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; + + 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 ocxl_afu *afu) +{ + idr_destroy(&afu->contexts_idr); + ocxl_fn_put(afu->fn); + kfree(afu); +} + +static void free_afu_dev(struct device *dev) +{ + struct ocxl_afu *afu = to_ocxl_afu(dev); + + ocxl_unregister_afu(afu); + free_afu(afu); +} + +static int set_afu_device(struct ocxl_afu *afu, const char *location) +{ + struct ocxl_fn *fn = afu->fn; + int rc; + + afu->dev.parent = &fn->dev; + afu->dev.release = free_afu_dev; + rc = dev_set_name(&afu->dev, "%s.%s.%hhu", afu->config.name, location, + afu->config.idx); + return rc; +} + +static int assign_afu_actag(struct ocxl_afu *afu, struct pci_dev *dev) +{ + struct ocxl_fn *fn = afu->fn; + int actag_count, actag_offset; + + /* + * 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(&afu->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(dev, afu->config.dvsec_afu_control_pos, + afu->actag_base, afu->actag_enabled); + dev_dbg(&afu->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 pci_dev *dev) +{ + struct ocxl_fn *fn = afu->fn; + int pasid_count, pasid_offset; + + /* + * 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(&afu->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(dev, afu->config.dvsec_afu_control_pos, + afu->pasid_base, + afu->config.pasid_supported_log); + dev_dbg(&afu->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, struct pci_dev *dev) +{ + int rc; + + 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(dev, afu->config.global_mmio_bar) + + afu->config.global_mmio_offset; + afu->pp_mmio_start = + pci_resource_start(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(&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 = set_afu_device(afu, dev_name(&dev->dev)); + if (rc) + return rc; + + rc = assign_afu_actag(afu, dev); + if (rc) + return rc; + + rc = assign_afu_pasid(afu, dev); + if (rc) { + reclaim_afu_actag(afu); + return rc; + } + + rc = map_mmio_areas(afu, dev); + if (rc) { + reclaim_afu_pasid(afu); + reclaim_afu_actag(afu); + return rc; + } + return 0; +} + +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) +{ + int rc; + + ocxl_config_set_afu_state(dev, afu->config.dvsec_afu_control_pos, 1); + /* + * Char device creation is the last step, as processes can + * call our driver immediately, so all our inits must be finished. + */ + rc = ocxl_create_cdev(afu); + if (rc) + return rc; + return 0; +} + +static void deactivate_afu(struct ocxl_afu *afu) +{ + struct pci_dev *dev = to_pci_dev(afu->fn->dev.parent); + + ocxl_destroy_cdev(afu); + ocxl_config_set_afu_state(dev, afu->config.dvsec_afu_control_pos, 0); +} + +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) { + free_afu(afu); + return rc; + } + + rc = ocxl_register_afu(afu); + if (rc) + goto err; + + rc = ocxl_sysfs_add_afu(afu); + if (rc) + goto err; + + rc = activate_afu(dev, afu); + if (rc) + goto err_sys; + + list_add_tail(&afu->list, &fn->afu_list); + return 0; + +err_sys: + ocxl_sysfs_remove_afu(afu); +err: + deconfigure_afu(afu); + device_unregister(&afu->dev); + return rc; +} + +void remove_afu(struct ocxl_afu *afu) +{ + list_del(&afu->list); + ocxl_context_detach_all(afu); + deactivate_afu(afu); + ocxl_sysfs_remove_afu(afu); + deconfigure_afu(afu); + device_unregister(&afu->dev); +} + +static struct ocxl_fn *alloc_function(struct pci_dev *dev) +{ + 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 = to_ocxl_function(dev); + + free_function(fn); +} + +static int set_function_device(struct ocxl_fn *fn, struct pci_dev *dev) +{ + int rc; + + fn->dev.parent = &dev->dev; + fn->dev.release = free_function_dev; + rc = dev_set_name(&fn->dev, "ocxlfn.%s", dev_name(&dev->dev)); + if (rc) + return rc; + pci_set_drvdata(dev, fn); + return 0; +} + +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); +} + +struct ocxl_fn *init_function(struct pci_dev *dev) +{ + struct ocxl_fn *fn; + int rc; + + fn = alloc_function(dev); + 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; +} + +void remove_function(struct ocxl_fn *fn) +{ + deconfigure_function(fn); + device_unregister(&fn->dev); +} diff --git a/drivers/misc/ocxl/ocxl_internal.h b/drivers/misc/ocxl/ocxl_internal.h index 06fd98c989c8..81086534dab5 100644 --- a/drivers/misc/ocxl/ocxl_internal.h +++ b/drivers/misc/ocxl/ocxl_internal.h @@ -150,4 +150,9 @@ int ocxl_afu_irq_set_fd(struct ocxl_context *ctx, u64 irq_offset, int eventfd); u64 ocxl_afu_irq_get_addr(struct ocxl_context *ctx, u64 irq_offset); +struct ocxl_fn *init_function(struct pci_dev *dev); +void remove_function(struct ocxl_fn *fn); +int init_afu(struct pci_dev *dev, struct ocxl_fn *fn, u8 afu_idx); +void remove_afu(struct ocxl_afu *afu); + #endif /* _OCXL_INTERNAL_H_ */ diff --git a/drivers/misc/ocxl/pci.c b/drivers/misc/ocxl/pci.c index 21f425472a82..4ed7cb1a667f 100644 --- a/drivers/misc/ocxl/pci.c +++ b/drivers/misc/ocxl/pci.c @@ -1,9 +1,6 @@ // SPDX-License-Identifier: GPL-2.0+ -// Copyright 2017 IBM Corp. +// Copyright 2019 IBM Corp. #include <linux/module.h> -#include <linux/pci.h> -#include <linux/idr.h> -#include <asm/pnv-ocxl.h> #include "ocxl_internal.h" /* @@ -17,520 +14,6 @@ static const struct pci_device_id ocxl_pci_tbl[] = { }; MODULE_DEVICE_TABLE(pci, ocxl_pci_tbl); - -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); -} - -struct ocxl_afu *ocxl_afu_get(struct ocxl_afu *afu) -{ - return (get_device(&afu->dev) == NULL) ? NULL : afu; -} - -void ocxl_afu_put(struct ocxl_afu *afu) -{ - put_device(&afu->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; - - 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 ocxl_afu *afu) -{ - idr_destroy(&afu->contexts_idr); - ocxl_fn_put(afu->fn); - kfree(afu); -} - -static void free_afu_dev(struct device *dev) -{ - struct ocxl_afu *afu = to_ocxl_afu(dev); - - ocxl_unregister_afu(afu); - free_afu(afu); -} - -static int set_afu_device(struct ocxl_afu *afu, const char *location) -{ - struct ocxl_fn *fn = afu->fn; - int rc; - - afu->dev.parent = &fn->dev; - afu->dev.release = free_afu_dev; - rc = dev_set_name(&afu->dev, "%s.%s.%hhu", afu->config.name, location, - afu->config.idx); - return rc; -} - -static int assign_afu_actag(struct ocxl_afu *afu, struct pci_dev *dev) -{ - struct ocxl_fn *fn = afu->fn; - int actag_count, actag_offset; - - /* - * 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(&afu->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(dev, afu->config.dvsec_afu_control_pos, - afu->actag_base, afu->actag_enabled); - dev_dbg(&afu->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 pci_dev *dev) -{ - struct ocxl_fn *fn = afu->fn; - int pasid_count, pasid_offset; - - /* - * 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(&afu->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(dev, afu->config.dvsec_afu_control_pos, - afu->pasid_base, - afu->config.pasid_supported_log); - dev_dbg(&afu->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, struct pci_dev *dev) -{ - int rc; - - 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(dev, afu->config.global_mmio_bar) + - afu->config.global_mmio_offset; - afu->pp_mmio_start = - pci_resource_start(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(&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 = set_afu_device(afu, dev_name(&dev->dev)); - if (rc) - return rc; - - rc = assign_afu_actag(afu, dev); - if (rc) - return rc; - - rc = assign_afu_pasid(afu, dev); - if (rc) { - reclaim_afu_actag(afu); - return rc; - } - - rc = map_mmio_areas(afu, dev); - if (rc) { - reclaim_afu_pasid(afu); - reclaim_afu_actag(afu); - return rc; - } - return 0; -} - -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) -{ - int rc; - - ocxl_config_set_afu_state(dev, afu->config.dvsec_afu_control_pos, 1); - /* - * Char device creation is the last step, as processes can - * call our driver immediately, so all our inits must be finished. - */ - rc = ocxl_create_cdev(afu); - if (rc) - return rc; - return 0; -} - -static void deactivate_afu(struct ocxl_afu *afu) -{ - struct pci_dev *dev = to_pci_dev(afu->fn->dev.parent); - - ocxl_destroy_cdev(afu); - 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) { - free_afu(afu); - return rc; - } - - rc = ocxl_register_afu(afu); - if (rc) - goto err; - - rc = ocxl_sysfs_add_afu(afu); - if (rc) - goto err; - - rc = activate_afu(dev, afu); - if (rc) - goto err_sys; - - list_add_tail(&afu->list, &fn->afu_list); - return 0; - -err_sys: - ocxl_sysfs_remove_afu(afu); -err: - deconfigure_afu(afu); - device_unregister(&afu->dev); - return rc; -} - -static void remove_afu(struct ocxl_afu *afu) -{ - list_del(&afu->list); - ocxl_context_detach_all(afu); - deactivate_afu(afu); - ocxl_sysfs_remove_afu(afu); - deconfigure_afu(afu); - device_unregister(&afu->dev); -} - -static struct ocxl_fn *alloc_function(struct pci_dev *dev) -{ - 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 = to_ocxl_function(dev); - - free_function(fn); -} - -static int set_function_device(struct ocxl_fn *fn, struct pci_dev *dev) -{ - int rc; - - fn->dev.parent = &dev->dev; - fn->dev.release = free_function_dev; - rc = dev_set_name(&fn->dev, "ocxlfn.%s", dev_name(&dev->dev)); - if (rc) - return rc; - pci_set_drvdata(dev, fn); - return 0; -} - -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(dev); - 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; -} - -static void remove_function(struct ocxl_fn *fn) -{ - deconfigure_function(fn); - device_unregister(&fn->dev); -} - static int ocxl_probe(struct pci_dev *dev, const struct pci_device_id *id) { int rc, afu_count = 0; |