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Mooring" , "sunnyliangjy@gmail.com" , "punit1.agrawal@toshiba.co.jp" , Stefano Stabellini , Michal Simek , "michael.auchter@ni.com" , "devicetree@vger.kernel.org" , "mathieu.poirier@linaro.org" , "linux-remoteproc@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "robh+dt@kernel.org" , "linux-arm-kernel@lists.infradead.org" Subject: RE: [PATCH v18 5/5] remoteproc: Add initial zynqmp R5 remoteproc driver Thread-Topic: [PATCH v18 5/5] remoteproc: Add initial zynqmp R5 remoteproc driver Thread-Index: AQHWmzGLZdXOwIwjxE6bV2X+UlYToKmfeqSAgAANHGA= Date: Mon, 19 Oct 2020 21:33:11 +0000 Message-ID: References: <20201005160614.3749-1-ben.levinsky@xilinx.com> <20201005160614.3749-6-ben.levinsky@xilinx.com> In-Reply-To: Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-Auto-Response-Suppress: DR, RN, NRN, OOF, AutoReply X-MS-TNEF-Correlator: authentication-results: xilinx.com; dkim=none (message not signed) header.d=none;xilinx.com; dmarc=none action=none header.from=xilinx.com; x-originating-ip: [149.199.62.133] x-ms-publictraffictype: Email x-ms-office365-filtering-ht: Tenant x-ms-office365-filtering-correlation-id: c35f968f-4fd4-406a-d1b7-08d874769466 x-ms-traffictypediagnostic: BYAPR02MB5192: x-ms-exchange-transport-forked: True x-microsoft-antispam-prvs: x-ms-oob-tlc-oobclassifiers: OLM:2958; x-ms-exchange-senderadcheck: 1 x-microsoft-antispam: BCL:0; x-microsoft-antispam-message-info: 0cYpgBLbPsH9jDNca1o/pCBij5iyBRUThXSyoNKj6WMT6xm7YaXwvVFAdS8DFJbSokX7VckiNeOdFGlmgFWmGHRtl62R5nd9TRCft/gJsMZYvY5eZbjqlYEYJuYjpNtUfmzFxveizSdIwhYfmy8AT9QnbFYn6QZzBJk68c0XatXq9Tha/QegI7gBoCwViXhu2NSeymBMI/E1SD6O+MwHQEo/s/VzULu1JLbVRxDaITrEZiq/WZriidZq5T15Bf3MrytwPY9t9yNuLLR1tSdVefydDRZhjts3ho+T6dS6MxLYAshrQBEuXuPMGOeim+FC x-forefront-antispam-report: CIP:255.255.255.255;CTRY:;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:BYAPR02MB4407.namprd02.prod.outlook.com;PTR:;CAT:NONE;SFS:(376002)(366004)(39860400002)(136003)(346002)(396003)(52536014)(66446008)(66946007)(6862004)(6636002)(64756008)(66556008)(8936002)(83380400001)(86362001)(54906003)(8676002)(478600001)(33656002)(316002)(2906002)(4326008)(66476007)(26005)(186003)(9686003)(30864003)(5660300002)(55016002)(71200400001)(76116006)(7696005)(53546011)(6506007)(579004);DIR:OUT;SFP:1101; x-ms-exchange-antispam-messagedata: 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 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-OriginatorOrg: xilinx.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: BYAPR02MB4407.namprd02.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: c35f968f-4fd4-406a-d1b7-08d874769466 X-MS-Exchange-CrossTenant-originalarrivaltime: 19 Oct 2020 21:33:11.5955 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 657af505-d5df-48d0-8300-c31994686c5c X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: d79uamYCOXL/80W/ZegnD3T92PUujoeYQFD7WoGJF7PFh2lbKFzDnbqeZVfVSwSJ8Dc1rKsvC+R8/YJXQM2Wqw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: BYAPR02MB5192 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Stefano, Thanks for the review. > -----Original Message----- > From: Stefano Stabellini > Sent: Monday, October 19, 2020 1:44 PM > To: Ben Levinsky > Cc: Ed T. Mooring ; sunnyliangjy@gmail.com; > punit1.agrawal@toshiba.co.jp; Stefano Stabellini ; > Michal Simek ; michael.auchter@ni.com; > devicetree@vger.kernel.org; mathieu.poirier@linaro.org; linux- > remoteproc@vger.kernel.org; linux-kernel@vger.kernel.org; > robh+dt@kernel.org; linux-arm-kernel@lists.infradead.org > Subject: Re: [PATCH v18 5/5] remoteproc: Add initial zynqmp R5 remoteproc > driver >=20 > On Mon, 5 Oct 2020, Ben Levinsky wrote: > > R5 is included in Xilinx Zynq UltraScale MPSoC so by adding this > > remotproc driver, we can boot the R5 sub-system in different 2 > > configurations - > > * split > > * lock-step > > > > The Xilinx R5 Remoteproc Driver boots the R5's via calls to the Xilinx > > Platform Management Unit that handles the R5 configuration, memory > access > > and R5 lifecycle management. The interface to this manager is done in t= his > > driver via zynqmp_pm_* function calls. >=20 > Mostly minor comments left >=20 >=20 > > Signed-off-by: Wendy Liang > > Signed-off-by: Michal Simek > > Signed-off-by: Ed Mooring > > Signed-off-by: Jason Wu > > Signed-off-by: Ben Levinsky > > --- > > v2: > > - remove domain struct as per review from Mathieu > > v3: > > - add xilinx-related platform mgmt fn's instead of wrapping around > > function pointer in xilinx eemi ops struct > > v4: > > - add default values for enums > > - fix formatting as per checkpatch.pl --strict. Note that 1 warning an= d 1 > check > > are still raised as each is due to fixing the warning results in tha= t > > particular line going over 80 characters. > > v5: > > - parse_fw change from use of rproc_of_resm_mem_entry_init to > > rproc_mem_entry_init and use of alloc/release > > - var's of type zynqmp_r5_pdata all have same local variable name > > - use dev_dbg instead of dev_info > > v6: > > - adding memory carveouts is handled much more similarly. All mem > > carveouts are > > now described in reserved memory as needed. That is, TCM nodes are n= ot > > coupled to remoteproc anymore. This is reflected in the remoteproc R= 5 > > driver > > and the device tree binding. > > - remove mailbox from device tree binding as it is not necessary for e= lf > > loading > > - use lockstep-mode property for configuring RPU > > v7: > > - remove unused headers > > - change u32 *lockstep_mode -> u32 lockstep_mode; > > - change device-tree binding "lockstep-mode" to xlnx,cluster-mode > > - remove zynqmp_r5_mem_probe and loop to Probe R5 memory devices at > > remoteproc-probe time > > - remove is_r5_mode_set from zynqmp rpu remote processor private data > > - do not error out if no mailbox is provided > > - remove zynqmp_r5_remoteproc_probe call of platform_set_drvdata as > > pdata is > > handled in zynqmp_r5_remoteproc_remove > > v8: > > - remove old acks, reviewed-by's in commit message > > v9: > > - as mboxes are now optional, if pdata->tx_mc_skbs not initialized then > > do not call skb_queue_empty > > - update usage for zynqmp_pm_set_rpu_mode, > zynqmp_pm_set_tcm_config and > > zynqmp_pm_get_rpu_mode > > - update 5/5 patch commit message to document supported configurations > > and how they are booted by the driver. > > - remove copyrights other than SPDX from zynqmp_r5_remoteproc.c > > - compilation warnings no longer raised > > - remove unused includes from zynqmp_r5_remoteproc.c > > - remove unused var autoboot from zynqmp_r5_remoteproc.c > > - reorder zynqmp_r5_pdata fpr small mem savings due to alignment > > - use of zynqmp_pm_set_tcm_config now does not have > > output arg > > - in tcm handling, unconditionally use &=3D 0x000fffff mask since all n= odes > > in this fn are for tcm > > - update comments for translating dma field in tcm handling to device > > address > > - update calls to rproc_mem_entry_init in parse_mem_regions so that the= re > > are only 2 cases for types of carveouts instead of 3 > > - in parse_mem_regions, check if device tree node is null before using = it > > - add example device tree nodes used in parse_mem_regions and tcm > parsing > > - add comment for vring id node length > > - add check for string length so that vring id is at least min length > > - move tcm nodes from reserved mem to instead own device tree nodes > > and only use them if enabled in device tree > > - add comment for explaining handling of rproc_elf_load_rsc_table > > - remove obsolete check for "if (vqid < 0)" in zynqmp_r5_rproc_kick > > - remove unused field mems in struct zynqmp_r5_pdata > > - remove call to zynqmp_r5_mem_probe and the fn itself as tcm handling > > is done by zyqmp_r5_pm_request_tcm > > - remove obsolete setting of dma_ops and parent device dma_mask > > - remove obsolete use of of_dma_configure > > - add comment for call to r5_set_mode fn > > - make mbox usage optional and gracefully inform user via dev_dbg if no= t > > present > > - change var lockstep_mode from u32* to u32 > > v11: > > - use enums instead of u32 where possible in zynqmp_r5_remoteproc > > - update usage of zynqmp_pm_set/get_rpu_mode and > zynqmp_pm_set_tcm_config > > - update prints to not use carriage return, just newline > > - look up tcm banks via property in r5 node instead of string name > > - print device tree nodes with %pOF instead of %s with node name field > > - update tcm release to unmap VA > > - handle r5-1 use case > > v12: > > - update signed off by so that latest developer name is last > > - do not cast enums to u32s for zynqmp_pm* functions > > v14: > > - change zynqmp_r5_remoteproc::rpus and rpu_mode to static > > - fix typo > > - zynqmp_r5_remoteproc::r5_set_mode set rpu mode from > > property specified in device tree > > - use u32 instead of u32* to store in remoteproc memory entry private d= ata > > for pnode_id information > > - always call r5_set_mode on probe > > - remove alloc of zynqmp_r5_pdata in > > zynqmp_r5_remoteproc::zynqmp_r5_remoteproc_probe as there is static > > allocation already > > - error at probe time if lockstep-mode property not present in device t= ree > > - update commit message as per review > > - remove dependency on MAILBOX in makefile as ZYNQMP_IPI_MBOX is > present > > - remove unused macros > > - update comment ordering of zynqmp_r5_pdata to match struct definition > > - zynqmp_r5_remoteproc::tcm_mem_release error if pnode id is invalid > > - remove obsolete TODOs > > - only call zynqmp_r5_remoteproc::zynqmp_r5_probe if the index is valid > > - remove uneven dev_dbg/dev_err fn calls > > v15: > > - if lockstep mode prop is present, then RPU cluster is in lockstep mod= e. > > if not present, cluster is in split mode. > > - if 2 RPUs provided but one is lockstep then error out as this is inva= lid > > configuration > > v16: > > - replace of_get_property(dev->of_node, "lockstep-mode" with > > of_property_read_bool > > - propagate rpu mode specified in device tree through functions instead > > of holding a global, static var > > - check child remoteproc nodes via of_get_available_child_count before > > looping through children > > - replace check of "pdata->pnode_id =3D=3D 0" instead by checking rpu's > > zynqmp_r5_pdata* if NULL > > - remove old, obsolete checks for dma_pools in > zynqmp_r5_remoteproc_remove > > - change rpus from zynqmp_r5_pdata[] to zynqmp_r5_pdata*[] so that > > check for pdata->pnode_id =3D=3D 0 is not needed > > v17: > > - fix style as per kernel test bot > > v18: > > - to more closely mimic other remoteproc drivers, change zynqmp r5 rpro= c > > data from zynqmp_r5_pdata to zynqmp_r5_rproc and pdata local var to > > zproc > > - remove global vars rpus and rpu_mode > > - instantiate device for zynqmp r5 rproc from device set by rproc_alloc > > - fix typos > > - update to call zynqmp_r5_release from the rproc_alloc-related device = and > > remove the instantiated device from zynqmp_r5_probe > > - remove unneeded call to platform_set_drvdata > > - remove driver remove function, as the clean up is handled in release > > - remove while (!skb_queue_empty loop and mbox_free_channel calls in > > zynqmp_r5_release, and mbox_free_channel > > - remove device_unregister call in zynqmp_r5_release > > - remove kzalloc for pdata (what is now called z_rproc) > > - update conditional in loop to calls of zynqmp_r5_probe > > > > --- > > drivers/remoteproc/Kconfig | 8 + > > drivers/remoteproc/Makefile | 1 + > > drivers/remoteproc/zynqmp_r5_remoteproc.c | 707 > ++++++++++++++++++++++ > > 3 files changed, 716 insertions(+) > > create mode 100644 drivers/remoteproc/zynqmp_r5_remoteproc.c > > > > diff --git a/drivers/remoteproc/Kconfig b/drivers/remoteproc/Kconfig > > index c6659dfea7c7..68e567c5375c 100644 > > --- a/drivers/remoteproc/Kconfig > > +++ b/drivers/remoteproc/Kconfig > > @@ -275,6 +275,14 @@ config TI_K3_DSP_REMOTEPROC > > It's safe to say N here if you're not interested in utilizing > > the DSP slave processors. > > > > +config ZYNQMP_R5_REMOTEPROC > > + tristate "ZynqMP_R5 remoteproc support" > > + depends on PM && ARCH_ZYNQMP > > + select RPMSG_VIRTIO > > + select ZYNQMP_IPI_MBOX > > + help > > + Say y or m here to support ZynqMP R5 remote processors via the > remote > > + processor framework. > > endif # REMOTEPROC > > > > endmenu > > diff --git a/drivers/remoteproc/Makefile b/drivers/remoteproc/Makefile > > index 3dfa28e6c701..ef1abff654c2 100644 > > --- a/drivers/remoteproc/Makefile > > +++ b/drivers/remoteproc/Makefile > > @@ -33,3 +33,4 @@ obj-$(CONFIG_ST_REMOTEPROC) +=3D > st_remoteproc.o > > obj-$(CONFIG_ST_SLIM_REMOTEPROC) +=3D st_slim_rproc.o > > obj-$(CONFIG_STM32_RPROC) +=3D stm32_rproc.o > > obj-$(CONFIG_TI_K3_DSP_REMOTEPROC) +=3D ti_k3_dsp_remoteproc.o > > +obj-$(CONFIG_ZYNQMP_R5_REMOTEPROC) +=3D zynqmp_r5_remoteproc.o > > diff --git a/drivers/remoteproc/zynqmp_r5_remoteproc.c > b/drivers/remoteproc/zynqmp_r5_remoteproc.c > > new file mode 100644 > > index 000000000000..37bd76252ff2 > > --- /dev/null > > +++ b/drivers/remoteproc/zynqmp_r5_remoteproc.c > > @@ -0,0 +1,707 @@ > > +// SPDX-License-Identifier: GPL-2.0 > > +/* > > + * Zynq R5 Remote Processor driver > > + * > > + * Based on origin OMAP and Zynq Remote Processor driver > > + * > > + */ > > + > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > +#include > > + > > +#include "remoteproc_internal.h" > > + > > +#define MAX_RPROCS 2 /* Support up to 2 RPU */ > > +#define MAX_MEM_PNODES 4 /* Max power nodes for one RPU memory > instance */ > > + > > +#define BANK_LIST_PROP "meta-memory-regions" > > + > > +/* IPI buffer MAX length */ > > +#define IPI_BUF_LEN_MAX 32U > > +/* RX mailbox client buffer max length */ > > +#define RX_MBOX_CLIENT_BUF_MAX (IPI_BUF_LEN_MAX + \ > > + sizeof(struct zynqmp_ipi_message)) > > + > > +/** > > + * struct zynqmp_r5_mem - zynqmp rpu memory data > > + * @pnode_id: TCM power domain ids > > + * @res: memory resource > > + * @node: list node > > + */ > > +struct zynqmp_r5_mem { > > + u32 pnode_id[MAX_MEM_PNODES]; > > + struct resource res; > > + struct list_head node; > > +}; > > + > > +/** > > + * struct zynqmp_r5_rproc - zynqmp rpu remote processor state > > + * @rx_mc_buf: rx mailbox client buffer to save the rx message > > + * @tx_mc: tx mailbox client > > + * @rx_mc: rx mailbox client * @dev: device of RPU instance > > + * @mbox_work: mbox_work for the RPU remoteproc > > + * @tx_mc_skbs: socket buffers for tx mailbox client > > + * @dev: device of RPU instance > > + * @rproc: rproc handle > > + * @tx_chan: tx mailbox channel > > + * @rx_chan: rx mailbox channel > > + * @pnode_id: RPU CPU power domain id > > + */ > > +struct zynqmp_r5_rproc { > > + unsigned char rx_mc_buf[RX_MBOX_CLIENT_BUF_MAX]; > > + struct mbox_client tx_mc; > > + struct mbox_client rx_mc; > > + struct work_struct mbox_work; > > + struct sk_buff_head tx_mc_skbs; > > + struct device dev; > > + struct rproc *rproc; > > + struct mbox_chan *tx_chan; > > + struct mbox_chan *rx_chan; > > + u32 pnode_id; > > +}; > > + > > +/* > > + * r5_set_mode - set RPU operation mode > > + * @z_rproc: Remote processor private data > > + * > > + * set RPU operation mode > > + * > > + * Return: 0 for success, negative value for failure > > + */ > > +static int r5_set_mode(struct zynqmp_r5_rproc *z_rproc, > > + enum rpu_oper_mode rpu_mode) > > +{ > > + enum rpu_tcm_comb tcm_mode; > > + enum rpu_oper_mode cur_rpu_mode; > > + int ret; > > + > > + ret =3D zynqmp_pm_get_rpu_mode(z_rproc->pnode_id, > &cur_rpu_mode); > > + if (ret < 0) > > + return ret; > > + > > + if (rpu_mode !=3D cur_rpu_mode) { > > + ret =3D zynqmp_pm_set_rpu_mode(z_rproc->pnode_id, > > + rpu_mode); > > + if (ret < 0) > > + return ret; > > + } > > + > > + tcm_mode =3D (rpu_mode =3D=3D PM_RPU_MODE_LOCKSTEP) ? > > + PM_RPU_TCM_COMB : PM_RPU_TCM_SPLIT; > > + return zynqmp_pm_set_tcm_config(z_rproc->pnode_id, tcm_mode); > > +} > > + > > +/* > > + * ZynqMP R5 remoteproc memory release function > > + */ > > +static int tcm_mem_release(struct rproc *rproc, struct rproc_mem_entry > *mem) > > +{ > > + u32 pnode_id =3D (u64)mem->priv; > > + > > + if (pnode_id <=3D 0) >=20 > pnode_id is a u32, so checks for it to be negative don't make a lot of > sense >=20 >=20 Will fix in next rev > > + return -EINVAL; > > + > > + iounmap(mem->va); > > + return zynqmp_pm_release_node(pnode_id); > > +} > > + > > +/* > > + * ZynqMP R5 remoteproc operations > > + */ > > +static int zynqmp_r5_rproc_start(struct rproc *rproc) > > +{ > > + struct device *dev =3D rproc->dev.parent; > > + struct zynqmp_r5_rproc *z_rproc =3D rproc->priv; > > + enum rpu_boot_mem bootmem; > > + > > + bootmem =3D (rproc->bootaddr & 0xF0000000) =3D=3D 0xF0000000 ? > > + PM_RPU_BOOTMEM_HIVEC : PM_RPU_BOOTMEM_LOVEC; > > + > > + dev_dbg(dev, "RPU boot from %s.", > > + bootmem =3D=3D PM_RPU_BOOTMEM_HIVEC ? "OCM" : "TCM"); > > + > > + return zynqmp_pm_request_wake(z_rproc->pnode_id, 1, > > + bootmem, > ZYNQMP_PM_REQUEST_ACK_NO); > > +} > > + > > +static int zynqmp_r5_rproc_stop(struct rproc *rproc) > > +{ > > + struct zynqmp_r5_rproc *z_rproc =3D rproc->priv; > > + struct sk_buff *skb; > > + > > + if (z_rproc->tx_chan) > > + mbox_free_channel(z_rproc->tx_chan); > > + if (z_rproc->rx_chan) > > + mbox_free_channel(z_rproc->rx_chan); > > + > > + return zynqmp_pm_force_pwrdwn(z_rproc->pnode_id, > > + ZYNQMP_PM_REQUEST_ACK_BLOCKING); > > +} > > + > > +static int zynqmp_r5_rproc_mem_alloc(struct rproc *rproc, > > + struct rproc_mem_entry *mem) > > +{ > > + void *va; > > + > > + va =3D ioremap_wc(mem->dma, mem->len); > > + if (IS_ERR_OR_NULL(va)) > > + return -ENOMEM; > > + > > + /* Update memory entry va */ > > + mem->va =3D va; > > + > > + return 0; > > +} > > + > > +static int zynqmp_r5_rproc_mem_release(struct rproc *rproc, > > + struct rproc_mem_entry *mem) > > +{ > > + iounmap(mem->va); > > + return 0; > > +} > > + > > +static int parse_mem_regions(struct rproc *rproc) > > +{ > > + int num_mems, i; > > + struct zynqmp_r5_rproc *z_rproc =3D rproc->priv; > > + struct device *dev =3D &z_rproc->dev; > > + struct device_node *np =3D dev->of_node; > > + struct rproc_mem_entry *mem; > > + > > + num_mems =3D of_count_phandle_with_args(np, "memory-region", > NULL); > > + if (num_mems <=3D 0) > > + return 0; > > + > > + for (i =3D 0; i < num_mems; i++) { > > + struct device_node *node; > > + struct reserved_mem *rmem; > > + > > + node =3D of_parse_phandle(np, "memory-region", i); > > + if (!node) > > + return -EINVAL; > > + > > + rmem =3D of_reserved_mem_lookup(node); > > + if (!rmem) > > + return -EINVAL; > > + > > + if (strstr(node->name, "vdev0vring")) { > > + int vring_id; > > + char name[16]; > > + > > + /* > > + * expecting form of "rpuXvdev0vringX as documented > > + * in xilinx remoteproc device tree binding > > + */ > > + if (strlen(node->name) < 14) { > > + dev_err(dev, "%pOF is less than 14 chars", > > + node); > > + return -EINVAL; > > + } > > + > > + /* > > + * can be 1 of multiple vring IDs per IPC channel > > + * e.g. 'vdev0vring0' and 'vdev0vring1' > > + */ > > + vring_id =3D node->name[14] - '0'; >=20 > If you are going to use a direct access to node->name[14], then the > strlen check above should cover it, which means we should check for at > least strlen(node->name) < 15. >=20 Will fix in next rev >=20 > > + snprintf(name, sizeof(name), "vdev0vring%d", > vring_id); > > + /* Register vring */ > > + mem =3D rproc_mem_entry_init(dev, NULL, > > + (dma_addr_t)rmem->base, > > + rmem->size, rmem->base, > > + > zynqmp_r5_rproc_mem_alloc, > > + > zynqmp_r5_rproc_mem_release, > > + name); > > + } else { > > + /* Register DMA region */ > > + int (*alloc)(struct rproc *r, > > + struct rproc_mem_entry *rme); > > + int (*release)(struct rproc *r, > > + struct rproc_mem_entry *rme); > > + char name[20]; > > + > > + if (strstr(node->name, "vdev0buffer")) { > > + alloc =3D NULL; > > + release =3D NULL; > > + strcpy(name, "vdev0buffer"); > > + } else { > > + alloc =3D zynqmp_r5_rproc_mem_alloc; > > + release =3D zynqmp_r5_rproc_mem_release; > > + strcpy(name, node->name); > > + } > > + > > + mem =3D rproc_mem_entry_init(dev, NULL, > > + (dma_addr_t)rmem->base, > > + rmem->size, rmem->base, > > + alloc, release, name); > > + } > > + if (!mem) > > + return -ENOMEM; > > + > > + rproc_add_carveout(rproc, mem); > > + } > > + > > + return 0; > > +} > > + > > +/* call Xilinx Platform manager to request access to TCM bank */ > > +static int zynqmp_r5_pm_request_tcm(struct device_node *tcm_node, > > + struct device *dev, u32 *pnode_id) > > +{ > > + int ret; > > + > > + ret =3D of_property_read_u32(tcm_node, "pnode-id", pnode_id); > > + if (ret) > > + return ret; > > + > > + return zynqmp_pm_request_node(*pnode_id, > ZYNQMP_PM_CAPABILITY_ACCESS, 0, > > + ZYNQMP_PM_REQUEST_ACK_BLOCKING); > > +} > > + > > +/* Given tcm bank entry, >=20 > I think checkpatch.pl would complain for this comment format >=20 Will fix in next rev=20 >=20 > > + * this callback will set device address for R5 running on TCM > > + * and also setup virtual address for tcm bank remoteproc carveout > > + */ > > +static int tcm_mem_alloc(struct rproc *rproc, > > + struct rproc_mem_entry *mem) > > +{ > > + void *va; > > + struct device *dev =3D rproc->dev.parent; > > + > > + va =3D ioremap_wc(mem->dma, mem->len); > > + if (IS_ERR_OR_NULL(va)) > > + return -ENOMEM; > > + > > + /* Update memory entry va */ > > + mem->va =3D va; > > + > > + va =3D devm_ioremap_wc(dev, mem->da, mem->len); > > + if (!va) > > + return -ENOMEM; > > + /* As R5 is 32 bit, wipe out extra high bits */ > > + mem->da &=3D 0x000fffff; > > + /* > > + * handle tcm banks 1 a and b (0xffe90000 and oxffeb0000) > > + * As both of these the only common bit found not in tcm bank0 a or > b > > + * is at 0x80000 use this mask to suss it out > > + */ > > + if (mem->da & 0x80000) > > + /* > > + * need to do more to further translate > > + * tcm banks 1a and 1b at 0xffe90000 and oxffeb0000 > ^typo >=20 >=20 > > + * respectively to 0x0 and 0x20000 > > + */ > > + mem->da -=3D 0x90000; >=20 > I understand now why we do "mem->da -=3D 0x90000" and the in-code > comment > explains it. However, why the "if (mem->da & 0x80000)" check? >=20 > If we want to make sure to do this "translation" only for 0xffe90000 and > 0xffeb0000, wouldn't it be better to call them out explicitly, like: >=20 > if (mem->da =3D=3D 0x90000 || mem->da =3D=3D 0xB0000) >=20 Good suggestion, will change if as suggest=20 >=20 > Also if this if check fails, should we print an error? Or is it a > possible handled condition? Previously this is otherwise handled as TCM banks 0A and 0B. For completene= ss I will add error checking if it is not in this range either and if so, r= aise dev_err and EINVAL. Thanks Ben