From f6b4557c98121e5571c484b037897130d898287c Mon Sep 17 00:00:00 2001 From: Uma Krishnan Date: Mon, 26 Mar 2018 11:31:53 -0500 Subject: scsi: cxlflash: Adapter context support for OCXL Add support to create and release the adapter contexts for OCXL and provide means to specify certain contexts as a master. The existing cxlflash core has a design requirement that each host will have a single host context available by default. To satisfy this requirement, one host adapter context is created when the hardware AFU is initialized. This is returned by the get_context() fop. Signed-off-by: Uma Krishnan Acked-by: Matthew R. Ochs Reviewed-by: Frederic Barrat Signed-off-by: Martin K. Petersen --- drivers/scsi/cxlflash/ocxl_hw.c | 90 +++++++++++++++++++++++++++++++++++++++++ drivers/scsi/cxlflash/ocxl_hw.h | 6 +++ 2 files changed, 96 insertions(+) (limited to 'drivers') diff --git a/drivers/scsi/cxlflash/ocxl_hw.c b/drivers/scsi/cxlflash/ocxl_hw.c index 44688af7af3a..cbe4d9341f5a 100644 --- a/drivers/scsi/cxlflash/ocxl_hw.c +++ b/drivers/scsi/cxlflash/ocxl_hw.c @@ -17,6 +17,80 @@ #include "backend.h" #include "ocxl_hw.h" +/** + * ocxlflash_set_master() - sets the context as master + * @ctx_cookie: Adapter context to set as master. + */ +static void ocxlflash_set_master(void *ctx_cookie) +{ + struct ocxlflash_context *ctx = ctx_cookie; + + ctx->master = true; +} + +/** + * ocxlflash_get_context() - obtains the context associated with the host + * @pdev: PCI device associated with the host. + * @afu_cookie: Hardware AFU associated with the host. + * + * Return: returns the pointer to host adapter context + */ +static void *ocxlflash_get_context(struct pci_dev *pdev, void *afu_cookie) +{ + struct ocxl_hw_afu *afu = afu_cookie; + + return afu->ocxl_ctx; +} + +/** + * ocxlflash_dev_context_init() - allocate and initialize an adapter context + * @pdev: PCI device associated with the host. + * @afu_cookie: Hardware AFU associated with the host. + * + * Return: returns the adapter context on success, ERR_PTR on failure + */ +static void *ocxlflash_dev_context_init(struct pci_dev *pdev, void *afu_cookie) +{ + struct ocxl_hw_afu *afu = afu_cookie; + struct device *dev = afu->dev; + struct ocxlflash_context *ctx; + int rc; + + ctx = kzalloc(sizeof(*ctx), GFP_KERNEL); + if (unlikely(!ctx)) { + dev_err(dev, "%s: Context allocation failed\n", __func__); + rc = -ENOMEM; + goto err; + } + + ctx->master = false; + ctx->hw_afu = afu; +out: + return ctx; +err: + ctx = ERR_PTR(rc); + goto out; +} + +/** + * ocxlflash_release_context() - releases an adapter context + * @ctx_cookie: Adapter context to be released. + * + * Return: 0 on success, -errno on failure + */ +static int ocxlflash_release_context(void *ctx_cookie) +{ + struct ocxlflash_context *ctx = ctx_cookie; + int rc = 0; + + if (!ctx) + goto out; + + kfree(ctx); +out: + return rc; +} + /** * ocxlflash_destroy_afu() - destroy the AFU structure * @afu_cookie: AFU to be freed. @@ -28,6 +102,7 @@ static void ocxlflash_destroy_afu(void *afu_cookie) if (!afu) return; + ocxlflash_release_context(afu->ocxl_ctx); kfree(afu); } @@ -134,6 +209,7 @@ out: static void *ocxlflash_create_afu(struct pci_dev *pdev) { struct device *dev = &pdev->dev; + struct ocxlflash_context *ctx; struct ocxl_hw_afu *afu; int rc; @@ -159,6 +235,16 @@ static void *ocxlflash_create_afu(struct pci_dev *pdev) __func__, rc); goto err1; } + + ctx = ocxlflash_dev_context_init(pdev, afu); + if (IS_ERR(ctx)) { + rc = PTR_ERR(ctx); + dev_err(dev, "%s: ocxlflash_dev_context_init failed rc=%d\n", + __func__, rc); + goto err1; + } + + afu->ocxl_ctx = ctx; out: return afu; err1: @@ -170,6 +256,10 @@ err1: /* Backend ops to ocxlflash services */ const struct cxlflash_backend_ops cxlflash_ocxl_ops = { .module = THIS_MODULE, + .set_master = ocxlflash_set_master, + .get_context = ocxlflash_get_context, + .dev_context_init = ocxlflash_dev_context_init, + .release_context = ocxlflash_release_context, .create_afu = ocxlflash_create_afu, .destroy_afu = ocxlflash_destroy_afu, }; diff --git a/drivers/scsi/cxlflash/ocxl_hw.h b/drivers/scsi/cxlflash/ocxl_hw.h index 46de75b59b1a..f41ba0ba23c6 100644 --- a/drivers/scsi/cxlflash/ocxl_hw.h +++ b/drivers/scsi/cxlflash/ocxl_hw.h @@ -14,6 +14,7 @@ /* OCXL hardware AFU associated with the host */ struct ocxl_hw_afu { + struct ocxlflash_context *ocxl_ctx; /* Host context */ struct pci_dev *pdev; /* PCI device */ struct device *dev; /* Generic device */ @@ -28,3 +29,8 @@ struct ocxl_hw_afu { int max_pasid; /* Maximum number of contexts */ bool is_present; /* Function has AFUs defined */ }; + +struct ocxlflash_context { + struct ocxl_hw_afu *hw_afu; /* HW AFU back pointer */ + bool master; /* Whether this is a master context */ +}; -- cgit v1.2.3