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SubjectRe: [PATCH v4 3/7] ocxl: Create a clear delineation between ocxl backend & frontend
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Le 27/03/2019 à 06:31, Alastair D'Silva a écrit :
> From: Alastair D'Silva <alastair@d-silva.org>
>
> The OCXL driver contains both frontend code for interacting with userspace,
> as well as backend code for interacting with the hardware.
>
> This patch separates the backend code from the frontend so that it can be
> used by other device drivers that communicate via OpenCAPI.
>
> Relocate dev, cdev & sysfs files to the frontend code to allow external
> drivers to maintain their own devices.
>
> Reference counting on the device in the backend is replaced with kref
> counting.
>
> Move file & sysfs layer initialisation from core.c (backend) to
> pci.c (frontend).
>
> Create an ocxl_function oriented interface for initing devices &
> enumerating AFUs.
>
> Signed-off-by: Alastair D'Silva <alastair@d-silva.org>
> ---


Acked-by: Frederic Barrat <fbarrat@linux.ibm.com>



> drivers/misc/ocxl/context.c | 2 +-
> drivers/misc/ocxl/core.c | 201 +++++++++++++++++++-----------
> drivers/misc/ocxl/file.c | 142 ++++++++++++++-------
> drivers/misc/ocxl/ocxl_internal.h | 31 ++---
> drivers/misc/ocxl/pci.c | 56 ++++-----
> drivers/misc/ocxl/sysfs.c | 54 ++++----
> include/misc/ocxl.h | 119 ++++++++++++++++--
> 7 files changed, 409 insertions(+), 196 deletions(-)
>
> diff --git a/drivers/misc/ocxl/context.c b/drivers/misc/ocxl/context.c
> index c10a940e3b38..c73a859d2224 100644
> --- a/drivers/misc/ocxl/context.c
> +++ b/drivers/misc/ocxl/context.c
> @@ -238,7 +238,7 @@ int ocxl_context_detach(struct ocxl_context *ctx)
> }
> rc = ocxl_link_remove_pe(ctx->afu->fn->link, ctx->pasid);
> if (rc) {
> - dev_warn(&ctx->afu->dev,
> + dev_warn(&dev->dev,
> "Couldn't remove PE entry cleanly: %d\n", rc);
> }
> return 0;
> diff --git a/drivers/misc/ocxl/core.c b/drivers/misc/ocxl/core.c
> index 2f2fe12eac1e..b7a09b21ab36 100644
> --- a/drivers/misc/ocxl/core.c
> +++ b/drivers/misc/ocxl/core.c
> @@ -13,16 +13,6 @@ 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;
> @@ -31,6 +21,7 @@ static struct ocxl_afu *alloc_afu(struct ocxl_fn *fn)
> if (!afu)
> return NULL;
>
> + kref_init(&afu->kref);
> mutex_init(&afu->contexts_lock);
> mutex_init(&afu->afu_control_lock);
> idr_init(&afu->contexts_idr);
> @@ -39,32 +30,26 @@ static struct ocxl_afu *alloc_afu(struct ocxl_fn *fn)
> return afu;
> }
>
> -static void free_afu(struct ocxl_afu *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);
> }
>
> -static void free_afu_dev(struct device *dev)
> +void ocxl_afu_get(struct ocxl_afu *afu)
> {
> - struct ocxl_afu *afu = to_ocxl_afu(dev);
> -
> - ocxl_unregister_afu(afu);
> - free_afu(afu);
> + kref_get(&afu->kref);
> }
> +EXPORT_SYMBOL_GPL(ocxl_afu_get);
>
> -static int set_afu_device(struct ocxl_afu *afu, const char *location)
> +void ocxl_afu_put(struct ocxl_afu *afu)
> {
> - 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;
> + kref_put(&afu->kref, free_afu);
> }
> +EXPORT_SYMBOL_GPL(ocxl_afu_put);
>
> static int assign_afu_actag(struct ocxl_afu *afu)
> {
> @@ -233,27 +218,25 @@ static int configure_afu(struct ocxl_afu *afu, u8 afu_idx, struct pci_dev *dev)
> if (rc)
> return rc;
>
> - rc = set_afu_device(afu, dev_name(&dev->dev));
> - if (rc)
> - return rc;
> -
> rc = assign_afu_actag(afu);
> if (rc)
> return rc;
>
> rc = assign_afu_pasid(afu);
> - if (rc) {
> - reclaim_afu_actag(afu);
> - return rc;
> - }
> + if (rc)
> + goto err_free_actag;
>
> rc = map_mmio_areas(afu);
> - if (rc) {
> - reclaim_afu_pasid(afu);
> - reclaim_afu_actag(afu);
> - return rc;
> - }
> + 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)
> @@ -265,16 +248,8 @@ static void deconfigure_afu(struct ocxl_afu *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;
> }
>
> @@ -282,11 +257,10 @@ 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)
> +static int init_afu(struct pci_dev *dev, struct ocxl_fn *fn, u8 afu_idx)
> {
> int rc;
> struct ocxl_afu *afu;
> @@ -297,41 +271,29 @@ int init_afu(struct pci_dev *dev, struct ocxl_fn *fn, u8 afu_idx)
>
> rc = configure_afu(afu, afu_idx, dev);
> if (rc) {
> - free_afu(afu);
> + ocxl_afu_put(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;
> + if (rc) {
> + deconfigure_afu(afu);
> + ocxl_afu_put(afu);
> + return rc;
> + }
>
> 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;
> + return 0;
> }
>
> -void remove_afu(struct ocxl_afu *afu)
> +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);
> + ocxl_afu_put(afu); // matches the implicit get in alloc_afu
> }
>
> static struct ocxl_fn *alloc_function(void)
> @@ -358,7 +320,7 @@ static void free_function(struct ocxl_fn *fn)
>
> static void free_function_dev(struct device *dev)
> {
> - struct ocxl_fn *fn = to_ocxl_function(dev);
> + struct ocxl_fn *fn = container_of(dev, struct ocxl_fn, dev);
>
> free_function(fn);
> }
> @@ -372,7 +334,6 @@ static int set_function_device(struct ocxl_fn *fn, struct pci_dev *dev)
> rc = dev_set_name(&fn->dev, "ocxlfn.%s", dev_name(&dev->dev));
> if (rc)
> return rc;
> - pci_set_drvdata(dev, fn);
> return 0;
> }
>
> @@ -490,7 +451,7 @@ static void deconfigure_function(struct ocxl_fn *fn)
> pci_disable_device(dev);
> }
>
> -struct ocxl_fn *init_function(struct pci_dev *dev)
> +static struct ocxl_fn *init_function(struct pci_dev *dev)
> {
> struct ocxl_fn *fn;
> int rc;
> @@ -514,8 +475,100 @@ struct ocxl_fn *init_function(struct pci_dev *dev)
> return fn;
> }
>
> -void remove_function(struct ocxl_fn *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
> index 009e09b7ded5..7a38ea5af9db 100644
> --- a/drivers/misc/ocxl/file.c
> +++ b/drivers/misc/ocxl/file.c
> @@ -17,70 +17,60 @@ static struct class *ocxl_class;
> static struct mutex minors_idr_lock;
> static struct idr minors_idr;
>
> -static struct ocxl_afu *find_and_get_afu(dev_t devno)
> +static struct ocxl_file_info *find_file_info(dev_t devno)
> {
> - struct ocxl_afu *afu;
> - int afu_minor;
> + struct ocxl_file_info *info;
>
> - afu_minor = MINOR(devno);
> /*
> * We don't declare an RCU critical section here, as our AFU
> * is protected by a reference counter on the device. By the time the
> - * minor number of a device is removed from the idr, the ref count of
> + * info reference is removed from the idr, the ref count of
> * the device is already at 0, so no user API will access that AFU and
> * this function can't return it.
> */
> - afu = idr_find(&minors_idr, afu_minor);
> - if (afu)
> - ocxl_afu_get(afu);
> - return afu;
> + info = idr_find(&minors_idr, MINOR(devno));
> + return info;
> }
>
> -static int allocate_afu_minor(struct ocxl_afu *afu)
> +static int allocate_minor(struct ocxl_file_info *info)
> {
> int minor;
>
> mutex_lock(&minors_idr_lock);
> - minor = idr_alloc(&minors_idr, afu, 0, OCXL_NUM_MINORS, GFP_KERNEL);
> + minor = idr_alloc(&minors_idr, info, 0, OCXL_NUM_MINORS, GFP_KERNEL);
> mutex_unlock(&minors_idr_lock);
> return minor;
> }
>
> -static void free_afu_minor(struct ocxl_afu *afu)
> +static void free_minor(struct ocxl_file_info *info)
> {
> mutex_lock(&minors_idr_lock);
> - idr_remove(&minors_idr, MINOR(afu->dev.devt));
> + 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_afu *afu;
> + struct ocxl_file_info *info;
> struct ocxl_context *ctx;
> int rc;
>
> pr_debug("%s for device %x\n", __func__, inode->i_rdev);
>
> - afu = find_and_get_afu(inode->i_rdev);
> - if (!afu)
> + info = find_file_info(inode->i_rdev);
> + if (!info)
> return -ENODEV;
>
> ctx = ocxl_context_alloc();
> - if (!ctx) {
> - rc = -ENOMEM;
> - goto put_afu;
> - }
> + if (!ctx)
> + return -ENOMEM;
>
> - rc = ocxl_context_init(ctx, afu, inode->i_mapping);
> + rc = ocxl_context_init(ctx, info->afu, inode->i_mapping);
> if (rc)
> - goto put_afu;
> + return rc;
> +
> file->private_data = ctx;
> - ocxl_afu_put(afu);
> return 0;
> -
> -put_afu:
> - ocxl_afu_put(afu);
> - return rc;
> }
>
> static long afu_ioctl_attach(struct ocxl_context *ctx,
> @@ -204,11 +194,16 @@ static long afu_ioctl(struct file *file, unsigned int cmd,
> struct ocxl_ioctl_irq_fd irq_fd;
> u64 irq_offset;
> long rc;
> + bool closed;
>
> pr_debug("%s for context %d, command %s\n", __func__, ctx->pasid,
> CMD_STR(cmd));
>
> - if (ctx->status == CLOSED)
> + mutex_lock(&ctx->status_mutex);
> + closed = (ctx->status == CLOSED);
> + mutex_unlock(&ctx->status_mutex);
> +
> + if (closed)
> return -EIO;
>
> switch (cmd) {
> @@ -468,39 +463,102 @@ static const struct file_operations ocxl_afu_fops = {
> .release = afu_release,
> };
>
> -int ocxl_create_cdev(struct ocxl_afu *afu)
> +// Free the info struct
> +static void info_release(struct device *dev)
> +{
> + struct ocxl_file_info *info = container_of(dev, struct ocxl_file_info, dev);
> +
> + free_minor(info);
> + ocxl_afu_put(info->afu);
> + kfree(info);
> +}
> +
> +static int ocxl_file_make_visible(struct ocxl_file_info *info)
> {
> int rc;
>
> - cdev_init(&afu->cdev, &ocxl_afu_fops);
> - rc = cdev_add(&afu->cdev, afu->dev.devt, 1);
> + cdev_init(&info->cdev, &ocxl_afu_fops);
> + rc = cdev_add(&info->cdev, info->dev.devt, 1);
> if (rc) {
> - dev_err(&afu->dev, "Unable to add afu char device: %d\n", rc);
> + dev_err(&info->dev, "Unable to add afu char device: %d\n", rc);
> return rc;
> }
> +
> return 0;
> }
>
> -void ocxl_destroy_cdev(struct ocxl_afu *afu)
> +static void ocxl_file_make_invisible(struct ocxl_file_info *info)
> {
> - cdev_del(&afu->cdev);
> + cdev_del(&info->cdev);
> }
>
> -int ocxl_register_afu(struct ocxl_afu *afu)
> +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_afu_minor(afu);
> - if (minor < 0)
> + minor = allocate_minor(info);
> + if (minor < 0) {
> + kfree(info);
> return minor;
> - afu->dev.devt = MKDEV(MAJOR(ocxl_dev), minor);
> - afu->dev.class = ocxl_class;
> - return device_register(&afu->dev);
> + }
> +
> + 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)
> + goto err_put;
> +
> + 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
> + device_unregister(&info->dev);
> +err_put:
> + ocxl_afu_put(afu);
> + free_minor(info);
> + kfree(info);
> + return rc;
> }
>
> -void ocxl_unregister_afu(struct ocxl_afu *afu)
> +void ocxl_file_unregister_afu(struct ocxl_afu *afu)
> {
> - free_afu_minor(afu);
> + struct ocxl_file_info *info = ocxl_afu_get_private(afu);
> +
> + if (!info)
> + return;
> +
> + ocxl_file_make_invisible(info);
> + ocxl_sysfs_unregister_afu(info);
> + device_unregister(&info->dev);
> }
>
> static char *ocxl_devnode(struct device *dev, umode_t *mode)
> diff --git a/drivers/misc/ocxl/ocxl_internal.h b/drivers/misc/ocxl/ocxl_internal.h
> index 81086534dab5..53b6c64a1bf0 100644
> --- a/drivers/misc/ocxl/ocxl_internal.h
> +++ b/drivers/misc/ocxl/ocxl_internal.h
> @@ -11,9 +11,6 @@
> #define MAX_IRQ_PER_LINK 2000
> #define MAX_IRQ_PER_CONTEXT MAX_IRQ_PER_LINK
>
> -#define to_ocxl_function(d) container_of(d, struct ocxl_fn, dev)
> -#define to_ocxl_afu(d) container_of(d, struct ocxl_afu, dev)
> -
> extern struct pci_driver ocxl_pci_driver;
>
> struct ocxl_fn {
> @@ -30,11 +27,17 @@ struct ocxl_fn {
> 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 device dev;
> - struct cdev cdev;
> struct ocxl_afu_config config;
> int pasid_base;
> int pasid_count; /* opened contexts */
> @@ -48,7 +51,7 @@ struct ocxl_afu {
> u64 irq_base_offset;
> void __iomem *global_mmio_ptr;
> u64 pp_mmio_start;
> - struct bin_attribute attr_global_mmio;
> + void *private;
> };
>
> enum ocxl_context_status {
> @@ -91,13 +94,10 @@ struct ocxl_process_element {
> __be32 software_state;
> };
>
> -struct ocxl_afu *ocxl_afu_get(struct ocxl_afu *afu);
> -void ocxl_afu_put(struct ocxl_afu *afu);
> -
> int ocxl_create_cdev(struct ocxl_afu *afu);
> void ocxl_destroy_cdev(struct ocxl_afu *afu);
> -int ocxl_register_afu(struct ocxl_afu *afu);
> -void ocxl_unregister_afu(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);
> @@ -140,8 +140,8 @@ int ocxl_context_detach(struct ocxl_context *ctx);
> void ocxl_context_detach_all(struct ocxl_afu *afu);
> void ocxl_context_free(struct ocxl_context *ctx);
>
> -int ocxl_sysfs_add_afu(struct ocxl_afu *afu);
> -void ocxl_sysfs_remove_afu(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_afu_irq_alloc(struct ocxl_context *ctx, u64 *irq_offset);
> int ocxl_afu_irq_free(struct ocxl_context *ctx, u64 irq_offset);
> @@ -150,9 +150,4 @@ 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 4ed7cb1a667f..f2a3ef4b9bdd 100644
> --- a/drivers/misc/ocxl/pci.c
> +++ b/drivers/misc/ocxl/pci.c
> @@ -16,47 +16,45 @@ MODULE_DEVICE_TABLE(pci, ocxl_pci_tbl);
>
> static int ocxl_probe(struct pci_dev *dev, const struct pci_device_id *id)
> {
> - int rc, afu_count = 0;
> - u8 afu;
> + int rc;
> + struct ocxl_afu *afu, *tmp;
> struct ocxl_fn *fn;
> + struct list_head *afu_list;
>
> - if (!radix_enabled()) {
> - dev_err(&dev->dev, "Unsupported memory model (hash)\n");
> - return -ENODEV;
> - }
> -
> - fn = init_function(dev);
> - if (IS_ERR(fn)) {
> - dev_err(&dev->dev, "function init failed: %li\n",
> - PTR_ERR(fn));
> + fn = ocxl_function_open(dev);
> + if (IS_ERR(fn))
> return PTR_ERR(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++;
> + 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);
> }
> }
> - dev_info(&dev->dev, "%d AFU(s) configured\n", afu_count);
> +
> return 0;
> }
>
> -static void ocxl_remove(struct pci_dev *dev)
> +void ocxl_remove(struct pci_dev *dev)
> {
> - struct ocxl_afu *afu, *tmp;
> - struct ocxl_fn *fn = pci_get_drvdata(dev);
> + struct ocxl_fn *fn;
> + struct ocxl_afu *afu;
> + struct list_head *afu_list;
>
> - list_for_each_entry_safe(afu, tmp, &fn->afu_list, list) {
> - remove_afu(afu);
> + 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);
> }
> - remove_function(fn);
> +
> + ocxl_function_close(fn);
> }
>
> struct pci_driver ocxl_pci_driver = {
> diff --git a/drivers/misc/ocxl/sysfs.c b/drivers/misc/ocxl/sysfs.c
> index 0ab1fd1b2682..58f1ba264206 100644
> --- a/drivers/misc/ocxl/sysfs.c
> +++ b/drivers/misc/ocxl/sysfs.c
> @@ -3,11 +3,18 @@
> #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_ocxl_afu(device);
> + struct ocxl_afu *afu = to_afu(device);
>
> return scnprintf(buf, PAGE_SIZE, "%d\n",
> afu->config.global_mmio_size);
> @@ -17,7 +24,7 @@ static ssize_t pp_mmio_size_show(struct device *device,
> struct device_attribute *attr,
> char *buf)
> {
> - struct ocxl_afu *afu = to_ocxl_afu(device);
> + struct ocxl_afu *afu = to_afu(device);
>
> return scnprintf(buf, PAGE_SIZE, "%d\n",
> afu->config.pp_mmio_stride);
> @@ -27,7 +34,7 @@ static ssize_t afu_version_show(struct device *device,
> struct device_attribute *attr,
> char *buf)
> {
> - struct ocxl_afu *afu = to_ocxl_afu(device);
> + struct ocxl_afu *afu = to_afu(device);
>
> return scnprintf(buf, PAGE_SIZE, "%hhu:%hhu\n",
> afu->config.version_major,
> @@ -38,7 +45,7 @@ static ssize_t contexts_show(struct device *device,
> struct device_attribute *attr,
> char *buf)
> {
> - struct ocxl_afu *afu = to_ocxl_afu(device);
> + struct ocxl_afu *afu = to_afu(device);
>
> return scnprintf(buf, PAGE_SIZE, "%d/%d\n",
> afu->pasid_count, afu->pasid_max);
> @@ -55,7 +62,7 @@ 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_ocxl_afu(kobj_to_dev(kobj));
> + struct ocxl_afu *afu = to_afu(kobj_to_dev(kobj));
>
> if (count == 0 || off < 0 ||
> off >= afu->config.global_mmio_size)
> @@ -86,7 +93,7 @@ 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_ocxl_afu(kobj_to_dev(kobj));
> + struct ocxl_afu *afu = to_afu(kobj_to_dev(kobj));
>
> if ((vma_pages(vma) + vma->vm_pgoff) >
> (afu->config.global_mmio_size >> PAGE_SHIFT))
> @@ -99,27 +106,25 @@ static int global_mmio_mmap(struct file *filp, struct kobject *kobj,
> return 0;
> }
>
> -int ocxl_sysfs_add_afu(struct ocxl_afu *afu)
> +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(&afu->dev, &afu_attrs[i]);
> + rc = device_create_file(&info->dev, &afu_attrs[i]);
> if (rc)
> goto err;
> }
>
> - sysfs_attr_init(&afu->attr_global_mmio.attr);
> - afu->attr_global_mmio.attr.name = "global_mmio_area";
> - afu->attr_global_mmio.attr.mode = 0600;
> - afu->attr_global_mmio.size = afu->config.global_mmio_size;
> - afu->attr_global_mmio.read = global_mmio_read;
> - afu->attr_global_mmio.mmap = global_mmio_mmap;
> - rc = device_create_bin_file(&afu->dev, &afu->attr_global_mmio);
> + 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(&afu->dev,
> - "Unable to create global mmio attr for afu: %d\n",
> - rc);
> + dev_err(&info->dev, "Unable to create global mmio attr for afu: %d\n", rc);
> goto err;
> }
>
> @@ -127,15 +132,20 @@ int ocxl_sysfs_add_afu(struct ocxl_afu *afu)
>
> err:
> for (i--; i >= 0; i--)
> - device_remove_file(&afu->dev, &afu_attrs[i]);
> + device_remove_file(&info->dev, &afu_attrs[i]);
> +
> return rc;
> }
>
> -void ocxl_sysfs_remove_afu(struct ocxl_afu *afu)
> +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(&afu->dev, &afu_attrs[i]);
> - device_remove_bin_file(&afu->dev, &afu->attr_global_mmio);
> + device_remove_file(&info->dev, &afu_attrs[i]);
> + device_remove_bin_file(&info->dev, &info->attr_global_mmio);
> }
> diff --git a/include/misc/ocxl.h b/include/misc/ocxl.h
> index 9530d3be1b30..8bafd748e380 100644
> --- a/include/misc/ocxl.h
> +++ b/include/misc/ocxl.h
> @@ -16,11 +16,7 @@
>
> #define OCXL_AFU_NAME_SZ (24+1) /* add 1 for NULL termination */
>
> -/*
> - * The following 2 structures are a fairly generic way of representing
> - * the configuration data for a function and AFU, as read from the
> - * configuration space.
> - */
> +
> struct ocxl_afu_config {
> u8 idx;
> int dvsec_afu_control_pos; /* offset of AFU control DVSEC */
> @@ -49,12 +45,108 @@ struct ocxl_fn_config {
> s8 max_afu_index;
> };
>
> -/*
> - * Read the configuration space of a function and fill in a
> - * ocxl_fn_config structure with all the function details
> +// These are opaque outside the ocxl driver
> +struct ocxl_afu;
> +struct ocxl_fn;
> +
> +// Device detection & initialisation
> +
> +/**
> + * Open an OpenCAPI function on an OpenCAPI device
> + *
> + * @dev: The PCI device that contains the function
> + *
> + * Returns an opaque pointer to the function, or an error pointer (check with IS_ERR)
> */
> -int ocxl_config_read_function(struct pci_dev *dev,
> - struct ocxl_fn_config *fn);
> +struct ocxl_fn *ocxl_function_open(struct pci_dev *dev);
> +
> +/**
> + * Get the list of AFUs associated with a PCI function device
> + *
> + * Returns a list of struct ocxl_afu *
> + *
> + * @fn: The OpenCAPI function containing the AFUs
> + */
> +struct list_head *ocxl_function_afu_list(struct ocxl_fn *fn);
> +
> +/**
> + * Fetch an AFU instance from an OpenCAPI function
> + *
> + * @fn: The OpenCAPI function to get the AFU from
> + * @afu_idx: The index of the AFU to get
> + *
> + * If successful, the AFU should be released with ocxl_afu_put()
> + *
> + * Returns a pointer to the AFU, or NULL on error
> + */
> +struct ocxl_afu *ocxl_function_fetch_afu(struct ocxl_fn *fn, u8 afu_idx);
> +
> +/**
> + * Take a reference to an AFU
> + *
> + * @afu: The AFU to increment the reference count on
> + */
> +void ocxl_afu_get(struct ocxl_afu *afu);
> +
> +/**
> + * Release a reference to an AFU
> + *
> + * @afu: The AFU to decrement the reference count on
> + */
> +void ocxl_afu_put(struct ocxl_afu *afu);
> +
> +
> +/**
> + * Get the configuration information for an OpenCAPI function
> + *
> + * @fn: The OpenCAPI function to get the config for
> + *
> + * Returns the function config, or NULL on error
> + */
> +const struct ocxl_fn_config *ocxl_function_config(struct ocxl_fn *fn);
> +
> +/**
> + * Close an OpenCAPI function
> + *
> + * This will free any AFUs previously retrieved from the function, and
> + * detach and associated contexts. The contexts must by freed by the caller.
> + *
> + * @fn: The OpenCAPI function to close
> + *
> + */
> +void ocxl_function_close(struct ocxl_fn *fn);
> +
> +// AFU Metadata
> +
> +/**
> + * Get a pointer to the config for an AFU
> + *
> + * @afu: a pointer to the AFU to get the config for
> + *
> + * Returns a pointer to the AFU config
> + */
> +struct ocxl_afu_config *ocxl_afu_config(struct ocxl_afu *afu);
> +
> +/**
> + * Assign opaque hardware specific information to an OpenCAPI AFU.
> + *
> + * @dev: The PCI device associated with the OpenCAPI device
> + * @private: the opaque hardware specific information to assign to the driver
> + */
> +void ocxl_afu_set_private(struct ocxl_afu *afu, void *private);
> +
> +/**
> + * Fetch the hardware specific information associated with an external OpenCAPI
> + * AFU. This may be consumed by an external OpenCAPI driver.
> + *
> + * @afu: The AFU
> + *
> + * Returns the opaque pointer associated with the device, or NULL if not set
> + */
> +void *ocxl_afu_get_private(struct ocxl_afu *dev);
> +
> +
> +// Functions left here are for compatibility with the cxlflash driver
>
> /*
> * Read the configuration space of a function for the AFU specified by
> @@ -141,6 +233,13 @@ int ocxl_config_set_TL(struct pci_dev *dev, int tl_dvsec);
> int ocxl_config_terminate_pasid(struct pci_dev *dev,
> int afu_control_offset, int pasid);
>
> +/*
> + * Read the configuration space of a function and fill in a
> + * ocxl_fn_config structure with all the function details
> + */
> +int ocxl_config_read_function(struct pci_dev *dev,
> + struct ocxl_fn_config *fn);
> +
> /*
> * Set up the opencapi link for the function.
> *
>

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