From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from ozlabs.org (ozlabs.org [IPv6:2401:3900:2:1::2]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id D57111A08B2 for ; Tue, 14 Jul 2015 12:32:13 +1000 (AEST) Received: from mail-pa0-x241.google.com (mail-pa0-x241.google.com [IPv6:2607:f8b0:400e:c03::241]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 52434140770 for ; Tue, 14 Jul 2015 12:32:13 +1000 (AEST) Received: by pactm7 with SMTP id tm7so29158856pac.1 for ; Mon, 13 Jul 2015 19:32:12 -0700 (PDT) From: Daniel Axtens To: linuxppc-dev@ozlabs.org Cc: mpe@ellerman.id.au, benh@kernel.crashing.org, mikey@neuling.org, imunsie@au.ibm.com, "Matthew R. Ochs" , Daniel Axtens Subject: [PATCH 7/8] cxl: Refactor AFU init/teardown Date: Tue, 14 Jul 2015 12:29:33 +1000 Message-Id: <1436840974-3412-8-git-send-email-dja@axtens.net> In-Reply-To: <1436840974-3412-1-git-send-email-dja@axtens.net> References: <1436840974-3412-1-git-send-email-dja@axtens.net> List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , As with an adapter, some aspects of initialisation are done only once in the lifetime of an AFU: for example, allocating memory, or setting up sysfs/debugfs files. However, we may want to be able to do some parts of the initialisation multiple times: for example, in error recovery we want to be able to tear down and then re-map IO memory and IRQs. Therefore, refactor AFU init/teardown as follows. - Create two new functions: 'cxl_configure_afu', and its pair 'cxl_deconfigure_afu'. As with the adapter functions, these (de)configure resources that do not need to last the entire lifetime of the AFU. - Allocating and releasing memory remain the task of 'cxl_alloc_afu' and 'cxl_release_afu'. - Once-only functions that do not involve allocating/releasing memory stay in the overarching 'cxl_init_afu'/'cxl_remove_afu' pair. However, the task of picking an AFU mode and activating it has been broken out. Signed-off-by: Daniel Axtens --- drivers/misc/cxl/pci.c | 87 +++++++++++++++++++++++++++++--------------------- 1 file changed, 50 insertions(+), 37 deletions(-) diff --git a/drivers/misc/cxl/pci.c b/drivers/misc/cxl/pci.c index faddfad597a2..273e810020ef 100644 --- a/drivers/misc/cxl/pci.c +++ b/drivers/misc/cxl/pci.c @@ -693,45 +693,67 @@ static int sanitise_afu_regs(struct cxl_afu *afu) return 0; } -static int cxl_init_afu(struct cxl *adapter, int slice, struct pci_dev *dev) +static int cxl_configure_afu(struct cxl_afu *afu, struct cxl *adapter, struct pci_dev *dev) { - struct cxl_afu *afu; - bool free = true; int rc; - if (!(afu = cxl_alloc_afu(adapter, slice))) - return -ENOMEM; - - if ((rc = dev_set_name(&afu->dev, "afu%i.%i", adapter->adapter_num, slice))) - goto err1; - if ((rc = cxl_map_slice_regs(afu, adapter, dev))) - goto err1; + return rc; if ((rc = sanitise_afu_regs(afu))) - goto err2; + goto err1; /* We need to reset the AFU before we can read the AFU descriptor */ if ((rc = __cxl_afu_reset(afu))) - goto err2; + goto err1; if (cxl_verbose) dump_afu_descriptor(afu); if ((rc = cxl_read_afu_descriptor(afu))) - goto err2; + goto err1; if ((rc = cxl_afu_descriptor_looks_ok(afu))) - goto err2; + goto err1; if ((rc = init_implementation_afu_regs(afu))) - goto err2; + goto err1; if ((rc = cxl_register_serr_irq(afu))) - goto err2; + goto err1; if ((rc = cxl_register_psl_irq(afu))) - goto err3; + goto err2; + + return 0; + +err2: + cxl_release_serr_irq(afu); +err1: + cxl_unmap_slice_regs(afu); + return rc; +} + +static void cxl_deconfigure_afu(struct cxl_afu *afu) +{ + cxl_release_psl_irq(afu); + cxl_release_serr_irq(afu); + cxl_unmap_slice_regs(afu); +} + +static int cxl_init_afu(struct cxl *adapter, int slice, struct pci_dev *dev) +{ + struct cxl_afu *afu; + int rc; + + if (!(afu = cxl_alloc_afu(adapter, slice))) + return -ENOMEM; + + if ((rc = dev_set_name(&afu->dev, "afu%i.%i", adapter->adapter_num, slice))) + goto err_free; + + if ((rc = cxl_configure_afu(afu, adapter, dev))) + goto err_free; /* Don't care if this fails */ cxl_debugfs_afu_add(afu); @@ -746,10 +768,6 @@ static int cxl_init_afu(struct cxl *adapter, int slice, struct pci_dev *dev) if ((rc = cxl_sysfs_afu_add(afu))) goto err_put1; - - if ((rc = cxl_afu_select_best_mode(afu))) - goto err_put2; - adapter->afu[afu->slice] = afu; if ((rc = cxl_pci_vphb_add(afu))) @@ -757,21 +775,16 @@ static int cxl_init_afu(struct cxl *adapter, int slice, struct pci_dev *dev) return 0; -err_put2: - cxl_sysfs_afu_remove(afu); err_put1: - device_unregister(&afu->dev); - free = false; + cxl_deconfigure_afu(afu); cxl_debugfs_afu_remove(afu); - cxl_release_psl_irq(afu); -err3: - cxl_release_serr_irq(afu); -err2: - cxl_unmap_slice_regs(afu); -err1: - if (free) - kfree(afu); + device_unregister(&afu->dev); return rc; + +err_free: + kfree(afu); + return rc; + } static void cxl_remove_afu(struct cxl_afu *afu) @@ -791,10 +804,7 @@ static void cxl_remove_afu(struct cxl_afu *afu) cxl_context_detach_all(afu); cxl_afu_deactivate_mode(afu); - cxl_release_psl_irq(afu); - cxl_release_serr_irq(afu); - cxl_unmap_slice_regs(afu); - + cxl_deconfigure_afu(afu); device_unregister(&afu->dev); } @@ -1148,6 +1158,9 @@ static int cxl_probe(struct pci_dev *dev, const struct pci_device_id *id) for (slice = 0; slice < adapter->slices; slice++) { if ((rc = cxl_init_afu(adapter, slice, dev))) dev_err(&dev->dev, "AFU %i failed to initialise: %i\n", slice, rc); + + if ((rc = cxl_afu_select_best_mode(adapter->afu[slice]))) + dev_err(&dev->dev, "AFU %i failed to start: %i\n", slice, rc); } return 0; -- 2.1.4