diff options
Diffstat (limited to 'meta-openbmc-mods/meta-common/recipes-kernel/linux/linux-aspeed/0035-Implement-a-memory-driver-share-memory.patch')
| -rw-r--r-- | meta-openbmc-mods/meta-common/recipes-kernel/linux/linux-aspeed/0035-Implement-a-memory-driver-share-memory.patch | 249 |
1 files changed, 249 insertions, 0 deletions
diff --git a/meta-openbmc-mods/meta-common/recipes-kernel/linux/linux-aspeed/0035-Implement-a-memory-driver-share-memory.patch b/meta-openbmc-mods/meta-common/recipes-kernel/linux/linux-aspeed/0035-Implement-a-memory-driver-share-memory.patch new file mode 100644 index 000000000..51ddbb18e --- /dev/null +++ b/meta-openbmc-mods/meta-common/recipes-kernel/linux/linux-aspeed/0035-Implement-a-memory-driver-share-memory.patch @@ -0,0 +1,249 @@ +From 1d459c15998c9a79ba7a758cef6129ed29f3b958 Mon Sep 17 00:00:00 2001 +From: cyang29 <cheng.c.yang@intel.com> +Date: Fri, 9 Nov 2018 10:24:37 +0800 +Subject: [PATCH] Implement a memory driver share memory + +Implement a memory driver for BMC to access VGA share memory. +The driver is used by MDRV2. In MDRV2 BIOS will send whole +SMBIOS table to VGA memory and BMC can get the table from VGA +memory through this driver. + +Signed-off-by: cyang29 <cheng.c.yang@intel.com> +--- + .../devicetree/bindings/misc/vga-shared-memory.txt | 20 +++ + drivers/misc/Kconfig | 10 ++ + drivers/misc/Makefile | 1 + + drivers/misc/aspeed-vga-sharedmem.c | 164 +++++++++++++++++++++ + 4 files changed, 195 insertions(+) + create mode 100644 Documentation/devicetree/bindings/misc/vga-shared-memory.txt + create mode 100644 drivers/misc/aspeed-vga-sharedmem.c + +diff --git a/Documentation/devicetree/bindings/misc/vga-shared-memory.txt b/Documentation/devicetree/bindings/misc/vga-shared-memory.txt +new file mode 100644 +index 000000000000..03f57c53e844 +--- /dev/null ++++ b/Documentation/devicetree/bindings/misc/vga-shared-memory.txt +@@ -0,0 +1,20 @@ ++* Aspeed VGA shared memory driver ++ ++Aspeed VGA shared memory driver allow user to read data from AST2500 ++VGA memory. This driver is required by ManagedDataRegionlV2 ++specification. In the spec, BIOS will transfer whole SMBIOS table to ++VGA memroy and BMC get the table from VGA memory. 0penBMC project do ++not allow to use /dev/mem for security concerns. To get the data in ++VGA shared memory in user space, implement this driver only allowed ++user to mmap limited memory area. ++ ++Required properties: ++- compatible: "aspeed,ast2500-vga-sharedmem" ++ - aspeed,ast2500-vga-sharedmem: Aspeed AST2500 family ++- reg: Should contain VGA shared memory start address and length ++ ++Example: ++vga-shared-memory { ++ compatible = "aspeed,ast2500-vga-sharedmem"; ++ reg = <0x9ff00000 0x100000>; ++}; +diff --git a/drivers/misc/Kconfig b/drivers/misc/Kconfig +index 8e2fc51dcc44..1279a9674537 100644 +--- a/drivers/misc/Kconfig ++++ b/drivers/misc/Kconfig +@@ -543,6 +543,16 @@ config ASPEED_UART_ROUTING + If you want to configure UART routing on Aspeed BMC platforms, enable + this option. + ++config ASPEED_VGA_SHAREDMEM ++ tristate "Aspeed VGA Shared memory" ++ depends on (ARCH_ASPEED || COMPILE_TEST) ++ help ++ To access VGA shared memory on Aspeed BMC, enable this option. ++ This driver used by ManagedDataRegionlV2 specification. In the ++ specification, BIOS will transfer whole SMBIOS table to VGA ++ memory, and BMC can get the table from VGA memory through this ++ driver. ++ + source "drivers/misc/c2port/Kconfig" + source "drivers/misc/eeprom/Kconfig" + source "drivers/misc/cb710/Kconfig" +diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile +index 0f00eb63556c..f4951a6e435b 100644 +--- a/drivers/misc/Makefile ++++ b/drivers/misc/Makefile +@@ -62,3 +62,4 @@ obj-$(CONFIG_ASPEED_LPC_SIO) += aspeed-lpc-sio.o + obj-$(CONFIG_PCI_ENDPOINT_TEST) += pci_endpoint_test.o + obj-$(CONFIG_OCXL) += ocxl/ + obj-$(CONFIG_MISC_RTSX) += cardreader/ ++obj-$(CONFIG_ASPEED_VGA_SHAREDMEM) += aspeed-vga-sharedmem.o +diff --git a/drivers/misc/aspeed-vga-sharedmem.c b/drivers/misc/aspeed-vga-sharedmem.c +new file mode 100644 +index 000000000000..76f60cd67d3a +--- /dev/null ++++ b/drivers/misc/aspeed-vga-sharedmem.c +@@ -0,0 +1,164 @@ ++// SPDX-License-Identifier: GPL-2.0 ++/* ++ * Copyright (c) 2018 Intel Corporation ++ * VGA Shared Memory driver for Aspeed AST2500 ++ */ ++ ++#include <linux/kernel.h> ++#include <linux/miscdevice.h> ++#include <linux/mm.h> ++#include <linux/module.h> ++#include <linux/of_platform.h> ++ ++#define SHAREDMEM_NAME "vgasharedmem" ++ ++struct aspeed_vga_sharedmem { ++ struct miscdevice miscdev; ++ unsigned int addr; ++ unsigned int size; ++ bool mmap_enable; ++}; ++ ++static struct aspeed_vga_sharedmem *file_sharemem(struct file *file) ++{ ++ return container_of(file->private_data, ++ struct aspeed_vga_sharedmem, miscdev); ++} ++ ++static int vga_open(struct inode *inode, struct file *file) ++{ ++ if (!capable(CAP_SYS_ADMIN)) ++ return -EPERM; ++ ++ struct aspeed_vga_sharedmem *vga_sharedmem = file_sharemem(file); ++ ++ if (!vga_sharedmem->mmap_enable) ++ return -EPERM; ++ ++ return 0; ++} ++ ++static int vga_mmap(struct file *file, struct vm_area_struct *vma) ++{ ++ struct aspeed_vga_sharedmem *vga_sharedmem = file_sharemem(file); ++ ++ if (!capable(CAP_SYS_ADMIN)) ++ return -EPERM; ++ ++ vma->vm_flags = (vma->vm_flags & (~VM_WRITE)); ++ remap_pfn_range(vma, vma->vm_start, vga_sharedmem->addr >> PAGE_SHIFT, ++ vga_sharedmem->size, vma->vm_page_prot); ++ return 0; ++} ++ ++static ssize_t enable_mmap_show(struct device *dev, ++ struct device_attribute *attr, ++ char *buf) ++{ ++ struct aspeed_vga_sharedmem *vga_sharedmem = dev_get_drvdata(dev); ++ ++ return sprintf(buf, "%u\n", vga_sharedmem->mmap_enable); ++} ++ ++static ssize_t enable_mmap_store(struct device *dev, ++ struct device_attribute *attr, ++ const char *buf, size_t count) ++{ ++ struct aspeed_vga_sharedmem *vga_sharedmem = ++ dev_get_drvdata(dev); ++ bool val; ++ ++ if (kstrtobool(buf, &val)) ++ return -EINVAL; ++ ++ vga_sharedmem->mmap_enable = val; ++ ++ return count; ++} ++static DEVICE_ATTR_RW(enable_mmap); ++ ++static struct attribute *sharedmem_attrs[] = { ++ &dev_attr_enable_mmap.attr, ++ NULL ++}; ++ ++static const struct attribute_group sharedmem_attr_group = { ++ .attrs = sharedmem_attrs, ++}; ++ ++static const struct attribute_group *sharedmem_attr_groups[] = { ++ &sharedmem_attr_group, ++ NULL ++}; ++ ++static const struct file_operations vga_sharedmem_fops = { ++ .owner = THIS_MODULE, ++ .open = vga_open, ++ .mmap = vga_mmap, ++}; ++ ++static struct miscdevice vga_sharedmem_miscdev = { ++ .minor = MISC_DYNAMIC_MINOR, ++ .name = SHAREDMEM_NAME, ++ .fops = &vga_sharedmem_fops, ++ .groups = sharedmem_attr_groups, ++}; ++ ++static int vga_sharedmem_probe(struct platform_device *pdev) ++{ ++ struct aspeed_vga_sharedmem *vga_sharedmem; ++ struct device *dev = &pdev->dev; ++ u32 reg[2]; ++ struct resource *rc; ++ ++ vga_sharedmem = devm_kzalloc(dev, sizeof(*vga_sharedmem), GFP_KERNEL); ++ if (!vga_sharedmem) ++ return -ENOMEM; ++ ++ dev_set_drvdata(&pdev->dev, vga_sharedmem); ++ ++ rc = platform_get_resource(pdev, IORESOURCE_MEM, 0); ++ if (!rc) { ++ dev_err(dev, "Couldn't read size device-tree property\n"); ++ return -ENXIO; ++ } ++ ++ vga_sharedmem->addr = rc->start; ++ vga_sharedmem->size = resource_size(rc); ++ vga_sharedmem->mmap_enable = true; ++ ++ vga_sharedmem->miscdev = vga_sharedmem_miscdev; ++ ++ return misc_register(&vga_sharedmem->miscdev); ++} ++ ++static int vga_sharedmem_remove(struct platform_device *pdev) ++{ ++ struct aspeed_vga_sharedmem *vga_sharedmem = ++ dev_get_drvdata(&pdev->dev); ++ ++ misc_deregister(&vga_sharedmem->miscdev); ++ ++ return 0; ++} ++ ++static const struct of_device_id vga_sharedmem_match[] = { ++ { .compatible = "aspeed,ast2500-vga-sharedmem", }, ++ { } ++}; ++MODULE_DEVICE_TABLE(of, vga_sharedmem_match); ++ ++static struct platform_driver vga_sharedmem_driver = { ++ .driver = { ++ .name = "VGA-SHAREDMEM", ++ .of_match_table = vga_sharedmem_match, ++ }, ++ .probe = vga_sharedmem_probe, ++ .remove = vga_sharedmem_remove, ++}; ++ ++module_platform_driver(vga_sharedmem_driver); ++ ++MODULE_AUTHOR("Yang Cheng <cheng.c.yang@intel.com>"); ++MODULE_DESCRIPTION("Shared VGA memory"); ++MODULE_LICENSE("GPL v2"); +-- +2.16.2 + |