From patchwork Tue Aug 27 18:24:50 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Florian Fainelli X-Patchwork-Id: 13780011 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id A9315C54731 for ; Tue, 27 Aug 2024 18:27:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: MIME-Version:References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From: Reply-To:Content-Type:Content-ID:Content-Description:Resent-Date:Resent-From: Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=w0Ii+wlZKkye5eGzfMx2r3P7dJV1tz2sw1iu9adFa8o=; b=sY0cjR2uz4/nL8ql1pba5WhrFd wlCFWjlvXFCS0qRZ158YMH2TdgAheFfBjGLOm222nKqqVdumgDXgSJtlIIDe9Ar9WMWq3YFKkDEBi AqdAXsDvMKS/igvbUomwUpV/Uefrb5s37c59O36T48VUmJKVgDohVaJFrFvcT3IfQvYMZ9Nt2onM2 AAhg8mWobrkejBKSIRUuhMYMNuG1sIhcgICdZCkgQlrh/3pu/vyZcLnWumrn3AEdWmi2mV/klsjE9 eRyD3AqjNQzTrhZ1BwTV8Dp1Sm3cZLWGd0ab5tXCygTFAcpJt79b+uK/HskW4xCIrAfP4FMio7URY nnDkBj+w==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.97.1 #2 (Red Hat Linux)) id 1sj0un-0000000CUok-0kyw; Tue, 27 Aug 2024 18:27:37 +0000 Received: from desiato.infradead.org ([2001:8b0:10b:1:d65d:64ff:fe57:4e05]) by bombadil.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1sj0sI-0000000CUP8-3mWl for linux-arm-kernel@bombadil.infradead.org; Tue, 27 Aug 2024 18:25:03 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=desiato.20200630; h=Content-Transfer-Encoding:MIME-Version :References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=w0Ii+wlZKkye5eGzfMx2r3P7dJV1tz2sw1iu9adFa8o=; b=oRvjL5+jBL34H8TXAeAinzpqLV NMjA+7265cTqqXJO8OZGKOvhzWcZnvQ/8TYJ20qVT85H3qk8YktcMN1F5EhY3aKAcup4GbP/A1u9q TSnB2iiSRc91gXpsOE4/BTAxDUMBCWrqDSVvQeq/ZwIlSw91oLTJ+ZDu7wdJ2mxRZoidY3gEhFqno XTl5NP0GqpJcTvvNjkNjAO7qjdUHiKIxtTqC/Cc+GSN6GeTPY1PL3h2/PRDfSp0T6WgcE9ku5DFUi 6Zq68lWWqkfBz91/OeId/z4DFlNzyIolnmNXxcrZjoIrSvCYbutsOXazrdNLr7udy72JMhVRBwmFT 6U6095lA==; Received: from relay.smtp-ext.broadcom.com ([192.19.144.209]) by desiato.infradead.org with esmtps (Exim 4.97.1 #2 (Red Hat Linux)) id 1sj0sE-0000000AwIt-2Dl1 for linux-arm-kernel@lists.infradead.org; Tue, 27 Aug 2024 18:25:01 +0000 Received: from mail-lvn-it-01.lvn.broadcom.net (mail-lvn-it-01.lvn.broadcom.net [10.36.132.253]) by relay.smtp-ext.broadcom.com (Postfix) with ESMTP id 940ADC0000F5; Tue, 27 Aug 2024 11:24:54 -0700 (PDT) DKIM-Filter: OpenDKIM Filter v2.11.0 relay.smtp-ext.broadcom.com 940ADC0000F5 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=broadcom.com; s=dkimrelay; t=1724783094; bh=00yhDg6wTKBvyoqA/HsobzG0yYt1gEx8SsEpCSHFgAo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=DvgWwaVUp2wVJEdM+rI50QBdFThRCRTZP1mInzbtxYFathVgIadNRIa9tLqyGNvJB TX8425xyrJU+7z5NLTeuXFi2TMjf7b8/G2xFN2ri08+ApklpYP2IryeN4PB757Ruzm 8XZs6mWGSYvZHyH6CRChjB5TTe3uJLfsznpIHA9Y= Received: from stbirv-lnx-1.igp.broadcom.net (stbirv-lnx-1.igp.broadcom.net [10.67.48.32]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail-lvn-it-01.lvn.broadcom.net (Postfix) with ESMTPSA id 380BE18045EF45; Tue, 27 Aug 2024 11:24:54 -0700 (PDT) From: Florian Fainelli To: linux-arm-kernel@lists.infradead.org Cc: Florian Fainelli , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Sudeep Holla , Cristian Marussi , devicetree@vger.kernel.org (open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS), linux-kernel@vger.kernel.org (open list), arm-scmi@vger.kernel.org (open list:SYSTEM CONTROL & POWER/MANAGEMENT INTERFACE), justin.chen@broadcom.com, opendmb@gmail.com, kapil.hali@broadcom.com, bcm-kernel-feedback-list@broadcom.com, Arnd Bergmann Subject: [PATCH v4 2/2] firmware: arm_scmi: Support 'reg-io-width' property for shared memory Date: Tue, 27 Aug 2024 11:24:50 -0700 Message-Id: <20240827182450.3608307-3-florian.fainelli@broadcom.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20240827182450.3608307-1-florian.fainelli@broadcom.com> References: <20240827182450.3608307-1-florian.fainelli@broadcom.com> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240827_192458_916573_2386DE53 X-CRM114-Status: GOOD ( 22.02 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Some shared memory areas might only support a certain access width, such as 32-bit, which memcpy_{from,to}_io() does not adhere to at least on ARM64 by making both 8-bit and 64-bit accesses to such memory. Update the shmem layer to support reading from and writing to such shared memory area using the specified I/O width in the Device Tree. The various transport layers making use of the shmem.c code are updated accordingly to pass the I/O accessors that they store. Signed-off-by: Florian Fainelli --- drivers/firmware/arm_scmi/common.h | 32 +++++++- .../arm_scmi/scmi_transport_mailbox.c | 13 +++- .../firmware/arm_scmi/scmi_transport_optee.c | 11 ++- .../firmware/arm_scmi/scmi_transport_smc.c | 11 ++- drivers/firmware/arm_scmi/shmem.c | 78 +++++++++++++++++-- 5 files changed, 124 insertions(+), 21 deletions(-) diff --git a/drivers/firmware/arm_scmi/common.h b/drivers/firmware/arm_scmi/common.h index 69928bbd01c2..a13f79b37c99 100644 --- a/drivers/firmware/arm_scmi/common.h +++ b/drivers/firmware/arm_scmi/common.h @@ -316,6 +316,26 @@ enum scmi_bad_msg { MSG_MBOX_SPURIOUS = -5, }; +/* Used for compactness and signature validation of the function pointers being + * passed. + */ +typedef void (*shmem_copy_toio_t)(void __iomem *to, const void *from, + size_t count); +typedef void (*shmem_copy_fromio_t)(void *to, const void __iomem *from, + size_t count); + +/** + * struct scmi_shmem_io_ops - I/O operations to read from/write to + * Shared Memory + * + * @toio: Copy data to the shared memory area + * @fromio: Copy data from the shared memory area + */ +struct scmi_shmem_io_ops { + shmem_copy_fromio_t fromio; + shmem_copy_toio_t toio; +}; + /* shmem related declarations */ struct scmi_shared_mem; @@ -336,13 +356,16 @@ struct scmi_shared_mem; struct scmi_shared_mem_operations { void (*tx_prepare)(struct scmi_shared_mem __iomem *shmem, struct scmi_xfer *xfer, - struct scmi_chan_info *cinfo); + struct scmi_chan_info *cinfo, + shmem_copy_toio_t toio); u32 (*read_header)(struct scmi_shared_mem __iomem *shmem); void (*fetch_response)(struct scmi_shared_mem __iomem *shmem, - struct scmi_xfer *xfer); + struct scmi_xfer *xfer, + shmem_copy_fromio_t fromio); void (*fetch_notification)(struct scmi_shared_mem __iomem *shmem, - size_t max_len, struct scmi_xfer *xfer); + size_t max_len, struct scmi_xfer *xfer, + shmem_copy_fromio_t fromio); void (*clear_channel)(struct scmi_shared_mem __iomem *shmem); bool (*poll_done)(struct scmi_shared_mem __iomem *shmem, struct scmi_xfer *xfer); @@ -350,7 +373,8 @@ struct scmi_shared_mem_operations { bool (*channel_intr_enabled)(struct scmi_shared_mem __iomem *shmem); void __iomem *(*setup_iomap)(struct scmi_chan_info *cinfo, struct device *dev, - bool tx, struct resource *res); + bool tx, struct resource *res, + struct scmi_shmem_io_ops **ops); }; const struct scmi_shared_mem_operations *scmi_shared_mem_operations_get(void); diff --git a/drivers/firmware/arm_scmi/scmi_transport_mailbox.c b/drivers/firmware/arm_scmi/scmi_transport_mailbox.c index dc5ca894d5eb..1a2e90e5c765 100644 --- a/drivers/firmware/arm_scmi/scmi_transport_mailbox.c +++ b/drivers/firmware/arm_scmi/scmi_transport_mailbox.c @@ -25,6 +25,7 @@ * @chan_platform_receiver: Optional Platform Receiver mailbox unidirectional channel * @cinfo: SCMI channel info * @shmem: Transmit/Receive shared memory area + * @io_ops: Transport specific I/O operations */ struct scmi_mailbox { struct mbox_client cl; @@ -33,6 +34,7 @@ struct scmi_mailbox { struct mbox_chan *chan_platform_receiver; struct scmi_chan_info *cinfo; struct scmi_shared_mem __iomem *shmem; + struct scmi_shmem_io_ops *io_ops; }; #define client_to_scmi_mailbox(c) container_of(c, struct scmi_mailbox, cl) @@ -43,7 +45,8 @@ static void tx_prepare(struct mbox_client *cl, void *m) { struct scmi_mailbox *smbox = client_to_scmi_mailbox(cl); - core->shmem->tx_prepare(smbox->shmem, m, smbox->cinfo); + core->shmem->tx_prepare(smbox->shmem, m, smbox->cinfo, + smbox->io_ops->toio); } static void rx_callback(struct mbox_client *cl, void *m) @@ -197,7 +200,8 @@ static int mailbox_chan_setup(struct scmi_chan_info *cinfo, struct device *dev, if (!smbox) return -ENOMEM; - smbox->shmem = core->shmem->setup_iomap(cinfo, dev, tx, NULL); + smbox->shmem = core->shmem->setup_iomap(cinfo, dev, tx, NULL, + &smbox->io_ops); if (IS_ERR(smbox->shmem)) return PTR_ERR(smbox->shmem); @@ -298,7 +302,7 @@ static void mailbox_fetch_response(struct scmi_chan_info *cinfo, { struct scmi_mailbox *smbox = cinfo->transport_info; - core->shmem->fetch_response(smbox->shmem, xfer); + core->shmem->fetch_response(smbox->shmem, xfer, smbox->io_ops->fromio); } static void mailbox_fetch_notification(struct scmi_chan_info *cinfo, @@ -306,7 +310,8 @@ static void mailbox_fetch_notification(struct scmi_chan_info *cinfo, { struct scmi_mailbox *smbox = cinfo->transport_info; - core->shmem->fetch_notification(smbox->shmem, max_len, xfer); + core->shmem->fetch_notification(smbox->shmem, max_len, xfer, + smbox->io_ops->fromio); } static void mailbox_clear_channel(struct scmi_chan_info *cinfo) diff --git a/drivers/firmware/arm_scmi/scmi_transport_optee.c b/drivers/firmware/arm_scmi/scmi_transport_optee.c index 08911f40d1ff..2be4124c6826 100644 --- a/drivers/firmware/arm_scmi/scmi_transport_optee.c +++ b/drivers/firmware/arm_scmi/scmi_transport_optee.c @@ -114,6 +114,7 @@ enum scmi_optee_pta_cmd { * @req.shmem: Virtual base address of the shared memory * @req.msg: Shared memory protocol handle for SCMI request and * synchronous response + * @io_ops: Transport specific I/O operations * @tee_shm: TEE shared memory handle @req or NULL if using IOMEM shmem * @link: Reference in agent's channel list */ @@ -128,6 +129,7 @@ struct scmi_optee_channel { struct scmi_shared_mem __iomem *shmem; struct scmi_msg_payld *msg; } req; + struct scmi_shmem_io_ops *io_ops; struct tee_shm *tee_shm; struct list_head link; }; @@ -350,7 +352,8 @@ static int setup_dynamic_shmem(struct device *dev, struct scmi_optee_channel *ch static int setup_static_shmem(struct device *dev, struct scmi_chan_info *cinfo, struct scmi_optee_channel *channel) { - channel->req.shmem = core->shmem->setup_iomap(cinfo, dev, true, NULL); + channel->req.shmem = core->shmem->setup_iomap(cinfo, dev, true, NULL, + &channel->io_ops); if (IS_ERR(channel->req.shmem)) return PTR_ERR(channel->req.shmem); @@ -465,7 +468,8 @@ static int scmi_optee_send_message(struct scmi_chan_info *cinfo, ret = invoke_process_msg_channel(channel, core->msg->command_size(xfer)); } else { - core->shmem->tx_prepare(channel->req.shmem, xfer, cinfo); + core->shmem->tx_prepare(channel->req.shmem, xfer, cinfo, + channel->io_ops->toio); ret = invoke_process_smt_channel(channel); } @@ -484,7 +488,8 @@ static void scmi_optee_fetch_response(struct scmi_chan_info *cinfo, core->msg->fetch_response(channel->req.msg, channel->rx_len, xfer); else - core->shmem->fetch_response(channel->req.shmem, xfer); + core->shmem->fetch_response(channel->req.shmem, xfer, + channel->io_ops->fromio); } static void scmi_optee_mark_txdone(struct scmi_chan_info *cinfo, int ret, diff --git a/drivers/firmware/arm_scmi/scmi_transport_smc.c b/drivers/firmware/arm_scmi/scmi_transport_smc.c index c6c69a17a9cc..04e715ec1570 100644 --- a/drivers/firmware/arm_scmi/scmi_transport_smc.c +++ b/drivers/firmware/arm_scmi/scmi_transport_smc.c @@ -45,6 +45,7 @@ * @irq: An optional IRQ for completion * @cinfo: SCMI channel info * @shmem: Transmit/Receive shared memory area + * @io_ops: Transport specific I/O operations * @shmem_lock: Lock to protect access to Tx/Rx shared memory area. * Used when NOT operating in atomic mode. * @inflight: Atomic flag to protect access to Tx/Rx shared memory area. @@ -60,6 +61,7 @@ struct scmi_smc { int irq; struct scmi_chan_info *cinfo; struct scmi_shared_mem __iomem *shmem; + struct scmi_shmem_io_ops *io_ops; /* Protect access to shmem area */ struct mutex shmem_lock; #define INFLIGHT_NONE MSG_TOKEN_MAX @@ -144,7 +146,8 @@ static int smc_chan_setup(struct scmi_chan_info *cinfo, struct device *dev, if (!scmi_info) return -ENOMEM; - scmi_info->shmem = core->shmem->setup_iomap(cinfo, dev, tx, &res); + scmi_info->shmem = core->shmem->setup_iomap(cinfo, dev, tx, &res, + &scmi_info->io_ops); if (IS_ERR(scmi_info->shmem)) return PTR_ERR(scmi_info->shmem); @@ -229,7 +232,8 @@ static int smc_send_message(struct scmi_chan_info *cinfo, */ smc_channel_lock_acquire(scmi_info, xfer); - core->shmem->tx_prepare(scmi_info->shmem, xfer, cinfo); + core->shmem->tx_prepare(scmi_info->shmem, xfer, cinfo, + scmi_info->io_ops->toio); if (scmi_info->cap_id != ULONG_MAX) arm_smccc_1_1_invoke(scmi_info->func_id, scmi_info->cap_id, 0, @@ -253,7 +257,8 @@ static void smc_fetch_response(struct scmi_chan_info *cinfo, { struct scmi_smc *scmi_info = cinfo->transport_info; - core->shmem->fetch_response(scmi_info->shmem, xfer); + core->shmem->fetch_response(scmi_info->shmem, xfer, + scmi_info->io_ops->fromio); } static void smc_mark_txdone(struct scmi_chan_info *cinfo, int ret, diff --git a/drivers/firmware/arm_scmi/shmem.c b/drivers/firmware/arm_scmi/shmem.c index 01d8a9398fe8..e9f30ab671a8 100644 --- a/drivers/firmware/arm_scmi/shmem.c +++ b/drivers/firmware/arm_scmi/shmem.c @@ -34,9 +34,59 @@ struct scmi_shared_mem { u8 msg_payload[]; }; +static inline void shmem_memcpy_fromio32(void *to, + const void __iomem *from, + size_t count) +{ + WARN_ON(!IS_ALIGNED((unsigned long)from, 4) || + !IS_ALIGNED((unsigned long)to, 4) || + count % 4); + + __ioread32_copy(to, from, count / 4); +} + +static inline void shmem_memcpy_toio32(void __iomem *to, + const void *from, + size_t count) +{ + WARN_ON(!IS_ALIGNED((unsigned long)to, 4) || + !IS_ALIGNED((unsigned long)from, 4) || + count % 4); + + __iowrite32_copy(to, from, count / 4); +} + +static struct scmi_shmem_io_ops shmem_io_ops32 = { + .fromio = shmem_memcpy_fromio32, + .toio = shmem_memcpy_toio32, +}; + +/* Wrappers are needed for proper memcpy_{from,to}_io expansion by the + * pre-processor. + */ +static inline void shmem_memcpy_fromio(void *to, + const void __iomem *from, + size_t count) +{ + memcpy_fromio(to, from, count); +} + +static inline void shmem_memcpy_toio(void __iomem *to, + const void *from, + size_t count) +{ + memcpy_toio(to, from, count); +} + +static struct scmi_shmem_io_ops shmem_io_ops_default = { + .fromio = shmem_memcpy_fromio, + .toio = shmem_memcpy_toio, +}; + static void shmem_tx_prepare(struct scmi_shared_mem __iomem *shmem, struct scmi_xfer *xfer, - struct scmi_chan_info *cinfo) + struct scmi_chan_info *cinfo, + shmem_copy_toio_t copy_toio) { ktime_t stop; @@ -73,7 +123,7 @@ static void shmem_tx_prepare(struct scmi_shared_mem __iomem *shmem, iowrite32(sizeof(shmem->msg_header) + xfer->tx.len, &shmem->length); iowrite32(pack_scmi_header(&xfer->hdr), &shmem->msg_header); if (xfer->tx.buf) - memcpy_toio(shmem->msg_payload, xfer->tx.buf, xfer->tx.len); + copy_toio(shmem->msg_payload, xfer->tx.buf, xfer->tx.len); } static u32 shmem_read_header(struct scmi_shared_mem __iomem *shmem) @@ -82,7 +132,8 @@ static u32 shmem_read_header(struct scmi_shared_mem __iomem *shmem) } static void shmem_fetch_response(struct scmi_shared_mem __iomem *shmem, - struct scmi_xfer *xfer) + struct scmi_xfer *xfer, + shmem_copy_fromio_t copy_fromio) { size_t len = ioread32(&shmem->length); @@ -91,11 +142,12 @@ static void shmem_fetch_response(struct scmi_shared_mem __iomem *shmem, xfer->rx.len = min_t(size_t, xfer->rx.len, len > 8 ? len - 8 : 0); /* Take a copy to the rx buffer.. */ - memcpy_fromio(xfer->rx.buf, shmem->msg_payload + 4, xfer->rx.len); + copy_fromio(xfer->rx.buf, shmem->msg_payload + 4, xfer->rx.len); } static void shmem_fetch_notification(struct scmi_shared_mem __iomem *shmem, - size_t max_len, struct scmi_xfer *xfer) + size_t max_len, struct scmi_xfer *xfer, + shmem_copy_fromio_t copy_fromio) { size_t len = ioread32(&shmem->length); @@ -103,7 +155,7 @@ static void shmem_fetch_notification(struct scmi_shared_mem __iomem *shmem, xfer->rx.len = min_t(size_t, max_len, len > 4 ? len - 4 : 0); /* Take a copy to the rx buffer.. */ - memcpy_fromio(xfer->rx.buf, shmem->msg_payload, xfer->rx.len); + copy_fromio(xfer->rx.buf, shmem->msg_payload, xfer->rx.len); } static void shmem_clear_channel(struct scmi_shared_mem __iomem *shmem) @@ -139,7 +191,8 @@ static bool shmem_channel_intr_enabled(struct scmi_shared_mem __iomem *shmem) static void __iomem *shmem_setup_iomap(struct scmi_chan_info *cinfo, struct device *dev, bool tx, - struct resource *res) + struct resource *res, + struct scmi_shmem_io_ops **ops) { struct device_node *shmem __free(device_node); const char *desc = tx ? "Tx" : "Rx"; @@ -148,6 +201,7 @@ static void __iomem *shmem_setup_iomap(struct scmi_chan_info *cinfo, struct resource lres = {}; resource_size_t size; void __iomem *addr; + u32 reg_io_width; shmem = of_parse_phandle(cdev->of_node, "shmem", idx); if (!shmem) @@ -173,6 +227,16 @@ static void __iomem *shmem_setup_iomap(struct scmi_chan_info *cinfo, return IOMEM_ERR_PTR(-EADDRNOTAVAIL); } + of_property_read_u32(shmem, "reg-io-width", ®_io_width); + switch (reg_io_width) { + case 4: + *ops = &shmem_io_ops32; + break; + default: + *ops = &shmem_io_ops_default; + break; + } + return addr; }