lkml.org 
[lkml]   [2022]   [Nov]   [15]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH v7 2/5] remoteproc: pru: Add APIs to get and put the PRU cores
On Tue, Nov 15, 2022 at 11:29:19AM +0530, Md Danish Anwar wrote:
> Hi Mathieu,
>
> On 15/11/22 02:20, Mathieu Poirier wrote:
> > On Mon, Oct 31, 2022 at 01:07:58PM +0530, MD Danish Anwar wrote:
> >> From: Tero Kristo <t-kristo@ti.com>
> >>
> >> Add two new APIs, pru_rproc_get() and pru_rproc_put(), to the PRU
> >> driver to allow client drivers to acquire and release the remoteproc
> >> device associated with a PRU core. The PRU cores are treated as
> >> resources with only one client owning it at a time.
> >>
> >> The pru_rproc_get() function returns the rproc handle corresponding
> >> to a PRU core identified by the device tree "ti,prus" property under
> >> the client node. The pru_rproc_put() is the complementary function
> >> to pru_rproc_get().
> >>
> >> Co-developed-by: Suman Anna <s-anna@ti.com>
> >> Signed-off-by: Suman Anna <s-anna@ti.com>
> >> Signed-off-by: Tero Kristo <t-kristo@ti.com>
> >> Co-developed-by: Grzegorz Jaszczyk <grzegorz.jaszczyk@linaro.org>
> >> Signed-off-by: Grzegorz Jaszczyk <grzegorz.jaszczyk@linaro.org>
> >> Co-developed-by: Puranjay Mohan <p-mohan@ti.com>
> >> Signed-off-by: Puranjay Mohan <p-mohan@ti.com>
> >> Signed-off-by: MD Danish Anwar <danishanwar@ti.com>
> >
> > The above is very tedious to look at. Other than yours, please replace all the
> > SoBs with Co-developed-by tags. Even that seems to be an overkill... Anyways,
> > for this patch and the other ones in this set.
> >
>
> Sure, I will replace all the SoBs (other than mine) with Co-developed by tags
> for all the patches in this series.
>
> >> ---
> >> drivers/remoteproc/pru_rproc.c | 142 +++++++++++++++++++++++++++++++--
> >> include/linux/pruss.h | 56 +++++++++++++
> >> 2 files changed, 193 insertions(+), 5 deletions(-)
> >> create mode 100644 include/linux/pruss.h
> >>
> >> diff --git a/drivers/remoteproc/pru_rproc.c b/drivers/remoteproc/pru_rproc.c
> >> index 128bf9912f2c..9ba73cfc29e2 100644
> >> --- a/drivers/remoteproc/pru_rproc.c
> >> +++ b/drivers/remoteproc/pru_rproc.c
> >> @@ -2,12 +2,14 @@
> >> /*
> >> * PRU-ICSS remoteproc driver for various TI SoCs
> >> *
> >> - * Copyright (C) 2014-2020 Texas Instruments Incorporated - https://www.ti.com/
> >> + * Copyright (C) 2014-2022 Texas Instruments Incorporated - https://www.ti.com/
> >> *
> >> * Author(s):
> >> * Suman Anna <s-anna@ti.com>
> >> * Andrew F. Davis <afd@ti.com>
> >> * Grzegorz Jaszczyk <grzegorz.jaszczyk@linaro.org> for Texas Instruments
> >> + * Puranjay Mohan <p-mohan@ti.com>
> >> + * Md Danish Anwar <danishanwar@ti.com>
> >> */
> >>
> >> #include <linux/bitops.h>
> >> @@ -16,6 +18,7 @@
> >> #include <linux/module.h>
> >> #include <linux/of_device.h>
> >> #include <linux/of_irq.h>
> >> +#include <linux/pruss.h>
> >> #include <linux/pruss_driver.h>
> >> #include <linux/remoteproc.h>
> >>
> >> @@ -111,6 +114,8 @@ struct pru_private_data {
> >> * @rproc: remoteproc pointer for this PRU core
> >> * @data: PRU core specific data
> >> * @mem_regions: data for each of the PRU memory regions
> >> + * @client_np: client device node
> >> + * @lock: mutex to protect client usage
> >> * @fw_name: name of firmware image used during loading
> >> * @mapped_irq: virtual interrupt numbers of created fw specific mapping
> >> * @pru_interrupt_map: pointer to interrupt mapping description (firmware)
> >> @@ -126,6 +131,8 @@ struct pru_rproc {
> >> struct rproc *rproc;
> >> const struct pru_private_data *data;
> >> struct pruss_mem_region mem_regions[PRU_IOMEM_MAX];
> >> + struct device_node *client_np;
> >> + struct mutex lock; /* client access lock */
> >
> > Why is there a comment here when the field is already documented above?
> >
>
> I will remove the comment from here.
>
> > I will wait for you to address Roger's comments before looking at this set
> > further.
> >
>
> I had addressed two out of three of Roger's comments earlier. I missed one
> comment. I have responded to that now. Please have a look at this set.

I won't - spin off a new revision after addressing Roger's comments and I will
look at that one.

>
> > Thanks,
> > Mathieu
> >
> >> const char *fw_name;
> >> unsigned int *mapped_irq;
> >> struct pru_irq_rsc *pru_interrupt_map;
> >> @@ -146,6 +153,127 @@ void pru_control_write_reg(struct pru_rproc *pru, unsigned int reg, u32 val)
> >> writel_relaxed(val, pru->mem_regions[PRU_IOMEM_CTRL].va + reg);
> >> }
> >>
> >> +static struct rproc *__pru_rproc_get(struct device_node *np, int index)
> >> +{
> >> + struct rproc *rproc;
> >> + phandle rproc_phandle;
> >> + int ret;
> >> +
> >> + ret = of_property_read_u32_index(np, "ti,prus", index, &rproc_phandle);
> >> + if (ret)
> >> + return ERR_PTR(ret);
> >> +
> >> + rproc = rproc_get_by_phandle(rproc_phandle);
> >> + if (!rproc) {
> >> + ret = -EPROBE_DEFER;
> >> + goto err_no_rproc_handle;
> >> + }
> >> +
> >> + /* make sure it is PRU rproc */
> >> + if (!is_pru_rproc(rproc->dev.parent)) {
> >> + rproc_put(rproc);
> >> + return ERR_PTR(-ENODEV);
> >> + }
> >> +
> >> + get_device(&rproc->dev);
> >> +
> >> + return rproc;
> >> +
> >> +err_no_rproc_handle:
> >> + rproc_put(rproc);
> >> + return ERR_PTR(ret);
> >> +}
> >> +
> >> +/**
> >> + * pru_rproc_get() - get the PRU rproc instance from a device node
> >> + * @np: the user/client device node
> >> + * @index: index to use for the ti,prus property
> >> + * @pru_id: optional pointer to return the PRU remoteproc processor id
> >> + *
> >> + * This function looks through a client device node's "ti,prus" property at
> >> + * index @index and returns the rproc handle for a valid PRU remote processor if
> >> + * found. The function allows only one user to own the PRU rproc resource at a
> >> + * time. Caller must call pru_rproc_put() when done with using the rproc, not
> >> + * required if the function returns a failure.
> >> + *
> >> + * When optional @pru_id pointer is passed the PRU remoteproc processor id is
> >> + * returned.
> >> + *
> >> + * Return: rproc handle on success, and an ERR_PTR on failure using one
> >> + * of the following error values
> >> + * -ENODEV if device is not found
> >> + * -EBUSY if PRU is already acquired by anyone
> >> + * -EPROBE_DEFER is PRU device is not probed yet
> >> + */
> >> +struct rproc *pru_rproc_get(struct device_node *np, int index,
> >> + enum pruss_pru_id *pru_id)
> >> +{
> >> + struct rproc *rproc;
> >> + struct pru_rproc *pru;
> >> + struct device *dev;
> >> + int ret;
> >> +
> >> + rproc = __pru_rproc_get(np, index);
> >> + if (IS_ERR(rproc))
> >> + return rproc;
> >> +
> >> + pru = rproc->priv;
> >> + dev = &rproc->dev;
> >> +
> >> + mutex_lock(&pru->lock);
> >> +
> >> + if (pru->client_np) {
> >> + mutex_unlock(&pru->lock);
> >> + put_device(dev);
> >> + ret = -EBUSY;
> >> + goto err_no_rproc_handle;
> >> + }
> >> +
> >> + pru->client_np = np;
> >> +
> >> + mutex_unlock(&pru->lock);
> >> +
> >> + if (pru_id)
> >> + *pru_id = pru->id;
> >> +
> >> + return rproc;
> >> +
> >> +err_no_rproc_handle:
> >> + rproc_put(rproc);
> >> + return ERR_PTR(ret);
> >> +}
> >> +EXPORT_SYMBOL_GPL(pru_rproc_get);
> >> +
> >> +/**
> >> + * pru_rproc_put() - release the PRU rproc resource
> >> + * @rproc: the rproc resource to release
> >> + *
> >> + * Releases the PRU rproc resource and makes it available to other
> >> + * users.
> >> + */
> >> +void pru_rproc_put(struct rproc *rproc)
> >> +{
> >> + struct pru_rproc *pru;
> >> +
> >> + if (IS_ERR_OR_NULL(rproc) || !is_pru_rproc(rproc->dev.parent))
> >> + return;
> >> +
> >> + pru = rproc->priv;
> >> +
> >> + mutex_lock(&pru->lock);
> >> +
> >> + if (!pru->client_np) {
> >> + mutex_unlock(&pru->lock);
> >> + return;
> >> + }
> >> +
> >> + pru->client_np = NULL;
> >> + mutex_unlock(&pru->lock);
> >> +
> >> + rproc_put(rproc);
> >> +}
> >> +EXPORT_SYMBOL_GPL(pru_rproc_put);
> >> +
> >> static inline u32 pru_debug_read_reg(struct pru_rproc *pru, unsigned int reg)
> >> {
> >> return readl_relaxed(pru->mem_regions[PRU_IOMEM_DEBUG].va + reg);
> >> @@ -438,7 +566,7 @@ static void *pru_d_da_to_va(struct pru_rproc *pru, u32 da, size_t len)
> >> dram0 = pruss->mem_regions[PRUSS_MEM_DRAM0];
> >> dram1 = pruss->mem_regions[PRUSS_MEM_DRAM1];
> >> /* PRU1 has its local RAM addresses reversed */
> >> - if (pru->id == 1)
> >> + if (pru->id == PRUSS_PRU1)
> >> swap(dram0, dram1);
> >> shrd_ram = pruss->mem_regions[PRUSS_MEM_SHRD_RAM2];
> >>
> >> @@ -747,14 +875,14 @@ static int pru_rproc_set_id(struct pru_rproc *pru)
> >> case RTU0_IRAM_ADDR_MASK:
> >> fallthrough;
> >> case PRU0_IRAM_ADDR_MASK:
> >> - pru->id = 0;
> >> + pru->id = PRUSS_PRU0;
> >> break;
> >> case TX_PRU1_IRAM_ADDR_MASK:
> >> fallthrough;
> >> case RTU1_IRAM_ADDR_MASK:
> >> fallthrough;
> >> case PRU1_IRAM_ADDR_MASK:
> >> - pru->id = 1;
> >> + pru->id = PRUSS_PRU1;
> >> break;
> >> default:
> >> ret = -EINVAL;
> >> @@ -816,6 +944,8 @@ static int pru_rproc_probe(struct platform_device *pdev)
> >> pru->pruss = platform_get_drvdata(ppdev);
> >> pru->rproc = rproc;
> >> pru->fw_name = fw_name;
> >> + pru->client_np = NULL;
> >> + mutex_init(&pru->lock);
> >>
> >> for (i = 0; i < ARRAY_SIZE(mem_names); i++) {
> >> res = platform_get_resource_byname(pdev, IORESOURCE_MEM,
> >> @@ -904,7 +1034,7 @@ MODULE_DEVICE_TABLE(of, pru_rproc_match);
> >>
> >> static struct platform_driver pru_rproc_driver = {
> >> .driver = {
> >> - .name = "pru-rproc",
> >> + .name = PRU_RPROC_DRVNAME,
> >> .of_match_table = pru_rproc_match,
> >> .suppress_bind_attrs = true,
> >> },
> >> @@ -916,5 +1046,7 @@ module_platform_driver(pru_rproc_driver);
> >> MODULE_AUTHOR("Suman Anna <s-anna@ti.com>");
> >> MODULE_AUTHOR("Andrew F. Davis <afd@ti.com>");
> >> MODULE_AUTHOR("Grzegorz Jaszczyk <grzegorz.jaszczyk@linaro.org>");
> >> +MODULE_AUTHOR("Puranjay Mohan <p-mohan@ti.com>");
> >> +MODULE_AUTHOR("Md Danish Anwar <danishanwar@ti.com>");
> >> MODULE_DESCRIPTION("PRU-ICSS Remote Processor Driver");
> >> MODULE_LICENSE("GPL v2");
> >> diff --git a/include/linux/pruss.h b/include/linux/pruss.h
> >> new file mode 100644
> >> index 000000000000..fdc719b43db0
> >> --- /dev/null
> >> +++ b/include/linux/pruss.h
> >> @@ -0,0 +1,56 @@
> >> +/* SPDX-License-Identifier: GPL-2.0-only */
> >> +/**
> >> + * PRU-ICSS Subsystem user interfaces
> >> + *
> >> + * Copyright (C) 2015-2022 Texas Instruments Incorporated - http://www.ti.com
> >> + * Suman Anna <s-anna@ti.com>
> >> + */
> >> +
> >> +#ifndef __LINUX_PRUSS_H
> >> +#define __LINUX_PRUSS_H
> >> +
> >> +#include <linux/device.h>
> >> +#include <linux/types.h>
> >> +
> >> +#define PRU_RPROC_DRVNAME "pru-rproc"
> >> +
> >> +/*
> >> + * enum pruss_pru_id - PRU core identifiers
> >> + */
> >> +enum pruss_pru_id {
> >> + PRUSS_PRU0 = 0,
> >> + PRUSS_PRU1,
> >> + PRUSS_NUM_PRUS,
> >> +};
> >> +
> >> +struct device_node;
> >> +
> >> +#if IS_ENABLED(CONFIG_PRU_REMOTEPROC)
> >> +
> >> +struct rproc *pru_rproc_get(struct device_node *np, int index,
> >> + enum pruss_pru_id *pru_id);
> >> +void pru_rproc_put(struct rproc *rproc);
> >> +
> >> +#else
> >> +
> >> +static inline struct rproc *
> >> +pru_rproc_get(struct device_node *np, int index, enum pruss_pru_id *pru_id)
> >> +{
> >> + return ERR_PTR(-EOPNOTSUPP);
> >> +}
> >> +
> >> +static inline void pru_rproc_put(struct rproc *rproc) { }
> >> +
> >> +#endif /* CONFIG_PRU_REMOTEPROC */
> >> +
> >> +static inline bool is_pru_rproc(struct device *dev)
> >> +{
> >> + const char *drv_name = dev_driver_string(dev);
> >> +
> >> + if (strncmp(drv_name, PRU_RPROC_DRVNAME, sizeof(PRU_RPROC_DRVNAME)))
> >> + return false;
> >> +
> >> + return true;
> >> +}
> >> +
> >> +#endif /* __LINUX_PRUSS_H */
> >> --
> >> 2.25.1
> >>
>
> Thanks,
> Danish

\
 
 \ /
  Last update: 2022-11-15 19:29    [W:0.132 / U:0.560 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site