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Mon, 13 May 2019 16:09:42 +0000 From: Roy Pledge To: "linuxppc-dev@lists.ozlabs.org" , "linux-arm-kernel@lists.infradead.org" , "linux-kernel@vger.kernel.org" , Leo Li Subject: [PATCH v1 2/8] soc/fsl/qbman: Cleanup buffer pools if BMan was initialized prior to bootup Thread-Topic: [PATCH v1 2/8] soc/fsl/qbman: Cleanup buffer pools if BMan was initialized prior to bootup Thread-Index: AQHVCaZGBsQ22UU/s06XbqnO82VgUw== Date: Mon, 13 May 2019 16:09:42 +0000 Message-ID: <1557763756-24118-3-git-send-email-roy.pledge@nxp.com> References: <1557763756-24118-1-git-send-email-roy.pledge@nxp.com> In-Reply-To: <1557763756-24118-1-git-send-email-roy.pledge@nxp.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-mailer: git-send-email 2.7.4 x-clientproxiedby: SN4PR0501CA0144.namprd05.prod.outlook.com (2603:10b6:803:2c::22) To DB6PR0402MB2727.eurprd04.prod.outlook.com (2603:10a6:4:98::10) authentication-results: spf=none (sender IP is ) smtp.mailfrom=roy.pledge@nxp.com; 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This will ensure a consistent state if the kernel was soft restarted (kexec for example) Signed-off-by: Roy Pledge --- drivers/soc/fsl/qbman/bman.c | 17 +++++++++-------- drivers/soc/fsl/qbman/bman_ccsr.c | 10 ++++++++++ drivers/soc/fsl/qbman/bman_portal.c | 18 +++++++++++++++++- drivers/soc/fsl/qbman/bman_priv.h | 5 +++++ 4 files changed, 41 insertions(+), 9 deletions(-) diff --git a/drivers/soc/fsl/qbman/bman.c b/drivers/soc/fsl/qbman/bman.c index f84ab59..f4fb527 100644 --- a/drivers/soc/fsl/qbman/bman.c +++ b/drivers/soc/fsl/qbman/bman.c @@ -635,30 +635,31 @@ int bman_p_irqsource_add(struct bman_portal *p, u32 bits) return 0; } -static int bm_shutdown_pool(u32 bpid) +int bm_shutdown_pool(u32 bpid) { + int err = 0; struct bm_mc_command *bm_cmd; union bm_mc_result *bm_res; + + struct bman_portal *p = get_affine_portal(); while (1) { - struct bman_portal *p = get_affine_portal(); /* Acquire buffers until empty */ bm_cmd = bm_mc_start(&p->p); bm_cmd->bpid = bpid; bm_mc_commit(&p->p, BM_MCC_VERB_CMD_ACQUIRE | 1); if (!bm_mc_result_timeout(&p->p, &bm_res)) { - put_affine_portal(); pr_crit("BMan Acquire Command timedout\n"); - return -ETIMEDOUT; + err = -ETIMEDOUT; + goto done; } if (!(bm_res->verb & BM_MCR_VERB_ACQUIRE_BUFCOUNT)) { - put_affine_portal(); /* Pool is empty */ - return 0; + goto done; } - put_affine_portal(); } - +done: + put_affine_portal(); return 0; } diff --git a/drivers/soc/fsl/qbman/bman_ccsr.c b/drivers/soc/fsl/qbman/bman_ccsr.c index dc6d7e5..cb24a08 100644 --- a/drivers/soc/fsl/qbman/bman_ccsr.c +++ b/drivers/soc/fsl/qbman/bman_ccsr.c @@ -195,6 +195,16 @@ int bman_is_probed(void) } EXPORT_SYMBOL_GPL(bman_is_probed); +int bman_requires_cleanup(void) +{ + return __bman_requires_cleanup; +} + +void bman_done_cleanup(void) +{ + __bman_requires_cleanup = 0; +} + static int fsl_bman_probe(struct platform_device *pdev) { int ret, err_irq; diff --git a/drivers/soc/fsl/qbman/bman_portal.c b/drivers/soc/fsl/qbman/bman_portal.c index 7819bc2..6c1a734 100644 --- a/drivers/soc/fsl/qbman/bman_portal.c +++ b/drivers/soc/fsl/qbman/bman_portal.c @@ -100,7 +100,7 @@ static int bman_portal_probe(struct platform_device *pdev) struct device_node *node = dev->of_node; struct bm_portal_config *pcfg; struct resource *addr_phys[2]; - int irq, cpu, err; + int irq, cpu, err, i; err = bman_is_probed(); if (!err) @@ -180,6 +180,22 @@ static int bman_portal_probe(struct platform_device *pdev) if (!cpu_online(cpu)) bman_offline_cpu(cpu); + if (__bman_portals_probed == 1 && bman_requires_cleanup()) { + /* + * BMan wasn't reset prior to boot (Kexec for example) + * Empty all the buffer pools so they are in reset state + */ + for (i = 0; i < BM_POOL_MAX; i++) { + err = bm_shutdown_pool(i); + if (err) { + dev_err(dev, "Failed to shutdown bpool %d\n", + i); + goto err_portal_init; + } + } + bman_done_cleanup(); + } + return 0; err_portal_init: diff --git a/drivers/soc/fsl/qbman/bman_priv.h b/drivers/soc/fsl/qbman/bman_priv.h index 751ce90..aa3981e 100644 --- a/drivers/soc/fsl/qbman/bman_priv.h +++ b/drivers/soc/fsl/qbman/bman_priv.h @@ -76,3 +76,8 @@ int bman_p_irqsource_add(struct bman_portal *p, u32 bits); const struct bm_portal_config * bman_get_bm_portal_config(const struct bman_portal *portal); + +int bman_requires_cleanup(void); +void bman_done_cleanup(void); + +int bm_shutdown_pool(u32 bpid);