Re:[PATCH v5,4/4] drivers: uio: new driver for fsl_85xx_cache_sram
王文虎
wenhu.wang at vivo.com
Fri Apr 17 17:42:34 AEST 2020
>A driver for freescale 85xx platforms to access the Cache-Sram form>user level. This is extremely helpful for some user-space applications
>that require high performance memory accesses.
>
>Cc: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
>Cc: Christophe Leroy <christophe.leroy at c-s.fr>
>Cc: Scott Wood <oss at buserror.net>
>Cc: Michael Ellerman <mpe at ellerman.id.au>
>Cc: linuxppc-dev at lists.ozlabs.org
>Reviewed-by: Christophe Leroy <christophe.leroy at c-s.fr>
>Signed-off-by: Wang Wenhu <wenhu.wang at vivo.com>
Hi, Christophe,
I labeled you Reviewed comment.
Regards,
Wenhu
>---
>Changes since v1:
> * Addressed comments from Greg K-H
> * Moved kfree(info->name) into uio_info_free_internal()
>Changes since v2:
> * Addressed comments from Greg, Scott and Christophe
> * Use "uiomem->internal_addr" as if condition for sram memory free,
> and memset the uiomem entry
> * of_match_table modified to be apart from HW info which belong to
> the HW level driver fsl_85xx_cache_sram to match
> * Use roundup_pow_of_two for align calc
> * Remove useless clear block of uiomem entries.
> * Use UIO_INFO_VER micro for info->version, and define it as
> "devicetree,pseudo", meaning this is pseudo device and probed from
> device tree configuration
>Changes since v3:
> * Addressed comments from Christophe(use devm_xxx memory alloc interfaces)
>Changes since v4:
> * Use module_param_string for of_match_table, no binding to devicetree
>---
> drivers/uio/Kconfig | 9 ++
> drivers/uio/Makefile | 1 +
> drivers/uio/uio_fsl_85xx_cache_sram.c | 154 ++++++++++++++++++++++++++
> 3 files changed, 164 insertions(+)
> create mode 100644 drivers/uio/uio_fsl_85xx_cache_sram.c
>
>diff --git a/drivers/uio/Kconfig b/drivers/uio/Kconfig
>index 202ee81cfc2b..9c3b47461b71 100644
>--- a/drivers/uio/Kconfig
>+++ b/drivers/uio/Kconfig
>@@ -105,6 +105,15 @@ config UIO_NETX
> To compile this driver as a module, choose M here; the module
> will be called uio_netx.
>
>+config UIO_FSL_85XX_CACHE_SRAM
>+ tristate "Freescale 85xx Cache-Sram driver"
>+ depends on FSL_SOC_BOOKE && PPC32
>+ select FSL_85XX_CACHE_SRAM
>+ help
>+ Generic driver for accessing the Cache-Sram form user level. This
>+ is extremely helpful for some user-space applications that require
>+ high performance memory accesses.
>+
> config UIO_FSL_ELBC_GPCM
> tristate "eLBC/GPCM driver"
> depends on FSL_LBC
>diff --git a/drivers/uio/Makefile b/drivers/uio/Makefile
>index c285dd2a4539..be2056cffc21 100644
>--- a/drivers/uio/Makefile
>+++ b/drivers/uio/Makefile
>@@ -10,4 +10,5 @@ obj-$(CONFIG_UIO_NETX) += uio_netx.o
> obj-$(CONFIG_UIO_PRUSS) += uio_pruss.o
> obj-$(CONFIG_UIO_MF624) += uio_mf624.o
> obj-$(CONFIG_UIO_FSL_ELBC_GPCM) += uio_fsl_elbc_gpcm.o
>+obj-$(CONFIG_UIO_FSL_85XX_CACHE_SRAM) += uio_fsl_85xx_cache_sram.o
> obj-$(CONFIG_UIO_HV_GENERIC) += uio_hv_generic.o
>diff --git a/drivers/uio/uio_fsl_85xx_cache_sram.c b/drivers/uio/uio_fsl_85xx_cache_sram.c
>new file mode 100644
>index 000000000000..4db3648629b3
>--- /dev/null
>+++ b/drivers/uio/uio_fsl_85xx_cache_sram.c
>@@ -0,0 +1,154 @@
>+// SPDX-License-Identifier: GPL-2.0
>+/*
>+ * Copyright (C) 2020 Vivo Communication Technology Co. Ltd.
>+ * Copyright (C) 2020 Wang Wenhu <wenhu.wang at vivo.com>
>+ * All rights reserved.
>+ */
>+
>+#include <linux/platform_device.h>
>+#include <linux/uio_driver.h>
>+#include <linux/stringify.h>
>+#include <linux/module.h>
>+#include <linux/kernel.h>
>+#include <asm/fsl_85xx_cache_sram.h>
>+
>+#define DRIVER_NAME "uio_fsl_85xx_cache_sram"
>+#define UIO_INFO_VER "devicetree,pseudo"
>+#define UIO_NAME "uio_cache_sram"
>+
>+static void uio_info_free_internal(struct uio_info *info)
>+{
>+ int i;
>+
>+ for (i = 0; i < MAX_UIO_MAPS; i++) {
>+ struct uio_mem *uiomem = &info->mem[i];
>+
>+ if (uiomem->internal_addr) {
>+ mpc85xx_cache_sram_free(uiomem->internal_addr);
>+ memset(uiomem, 0, sizeof(*uiomem));
>+ }
>+ }
>+}
>+
>+static int uio_fsl_85xx_cache_sram_probe(struct platform_device *pdev)
>+{
>+ struct device_node *parent = pdev->dev.of_node;
>+ struct device_node *node = NULL;
>+ struct uio_info *info;
>+ struct uio_mem *uiomem;
>+ const char *dt_name;
>+ u32 mem_size;
>+ int ret;
>+
>+ /* alloc uio_info for one device */
>+ info = devm_kzalloc(&pdev->dev, sizeof(*info), GFP_KERNEL);
>+ if (!info)
>+ return -ENOMEM;
>+
>+ /* get optional uio name */
>+ if (of_property_read_string(parent, "uio_name", &dt_name))
>+ dt_name = UIO_NAME;
>+
>+ info->name = devm_kstrdup(&pdev->dev, dt_name, GFP_KERNEL);
>+ if (!info->name)
>+ return -ENOMEM;
>+
>+ uiomem = info->mem;
>+ for_each_child_of_node(parent, node) {
>+ void *virt;
>+ phys_addr_t phys;
>+
>+ ret = of_property_read_u32(node, "cache-mem-size", &mem_size);
>+ if (ret) {
>+ ret = -EINVAL;
>+ goto err_out;
>+ }
>+
>+ if (mem_size == 0) {
>+ dev_err(&pdev->dev, "error cache-mem-size should not be 0\n");
>+ ret = -EINVAL;
>+ goto err_out;
>+ }
>+
>+ virt = mpc85xx_cache_sram_alloc(mem_size, &phys,
>+ roundup_pow_of_two(mem_size));
>+ if (!virt) {
>+ /* mpc85xx_cache_sram_alloc to define the real cause */
>+ ret = -ENOMEM;
>+ goto err_out;
>+ }
>+
>+ uiomem->memtype = UIO_MEM_PHYS;
>+ uiomem->addr = phys;
>+ uiomem->size = mem_size;
>+ uiomem->name = kstrdup(node->name, GFP_KERNEL);
>+ uiomem->internal_addr = virt;
>+ uiomem++;
>+
>+ if (uiomem >= &info->mem[MAX_UIO_MAPS]) {
>+ dev_warn(&pdev->dev, "more than %d uio-maps for device.\n",
>+ MAX_UIO_MAPS);
>+ break;
>+ }
>+ }
>+
>+ if (uiomem == info->mem) {
>+ dev_err(&pdev->dev, "error no valid uio-map configuration found\n");
>+ return -EINVAL;
>+ }
>+
>+ info->version = UIO_INFO_VER;
>+
>+ /* register uio device */
>+ if (uio_register_device(&pdev->dev, info)) {
>+ dev_err(&pdev->dev, "error uio,cache-sram registration failed\n");
>+ ret = -ENODEV;
>+ goto err_out;
>+ }
>+
>+ platform_set_drvdata(pdev, info);
>+
>+ return 0;
>+err_out:
>+ uio_info_free_internal(info);
>+ return ret;
>+}
>+
>+static int uio_fsl_85xx_cache_sram_remove(struct platform_device *pdev)
>+{
>+ struct uio_info *info = platform_get_drvdata(pdev);
>+
>+ uio_unregister_device(info);
>+
>+ uio_info_free_internal(info);
>+
>+ return 0;
>+}
>+
>+#ifdef CONFIG_OF
>+static struct of_device_id uio_fsl_85xx_cache_sram_of_match[] = {
>+ { /* This is filled with module_parm */ },
>+ { /* Sentinel */ },
>+};
>+MODULE_DEVICE_TABLE(of, uio_fsl_85xx_cache_sram_of_match);
>+
>+module_param_string(of_id, uio_fsl_85xx_cache_sram_of_match[0].compatible,
>+ sizeof(uio_fsl_85xx_cache_sram_of_match[0].compatible), 0);
>+MODULE_PARM_DESC(of_id, "platform device id to be handled by cache-sram-uio");
>+#endif
>+
>+static struct platform_driver uio_fsl_85xx_cache_sram = {
>+ .probe = uio_fsl_85xx_cache_sram_probe,
>+ .remove = uio_fsl_85xx_cache_sram_remove,
>+ .driver = {
>+ .name = DRIVER_NAME,
>+ .of_match_table = of_match_ptr(uio_fsl_85xx_cache_sram_of_match),
>+ },
>+};
>+
>+module_platform_driver(uio_fsl_85xx_cache_sram);
>+
>+MODULE_AUTHOR("Wang Wenhu <wenhu.wang at vivo.com>");
>+MODULE_DESCRIPTION("Freescale MPC85xx Cache-Sram UIO Platform Driver");
>+MODULE_ALIAS("platform:" DRIVER_NAME);
>+MODULE_LICENSE("GPL v2");
>--
>2.17.1
>
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