staging: android: persistent_ram: handle reserving and mapping memory
Replace the ioremapped memory passed in from the drivers with a memblock_reserve and vmap. Adds a new function, persistent_ram_early_init, designed to be called from the machine init_early callback, that calls memblock_remove and saves the provided persistent ram area layout. Drivers only pass in their struct device * and ecc settings. Locating and mapping the memory is now handled entirely within persistent_ram. Also, convert ram_console to the new persistent_ram_init parameters that only take a struct device * and ecc settings. [jstultz: Fix pr_info casting issues on 64bit, folded two patches as the build breaks if they are apart. Also replaced phys_to_page() w/ pfn_to_page(addr>>PAGE_SHIFT), as phys_to_page is only on a few arches.] CC: Greg KH <gregkh@linuxfoundation.org> CC: Android Kernel Team <kernel-team@android.com> Signed-off-by: Colin Cross <ccross@android.com> Signed-off-by: John Stultz <john.stultz@linaro.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Colin Cross
Greg Kroah-Hartman
Родитель
9cc05ad97c
Коммит
404a604338
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@ -12,12 +12,17 @@
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*
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*/
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#include <linux/device.h>
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#include <linux/err.h>
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#include <linux/errno.h>
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/io.h>
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#include <linux/list.h>
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#include <linux/memblock.h>
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#include <linux/rslib.h>
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#include <linux/slab.h>
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#include <linux/vmalloc.h>
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#include "persistent_ram.h"
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struct persistent_ram_buffer {
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@ -29,7 +34,7 @@ struct persistent_ram_buffer {
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#define PERSISTENT_RAM_SIG (0x43474244) /* DBGC */
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static LIST_HEAD(zone_list);
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static __initdata LIST_HEAD(persistent_ram_list);
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static void persistent_ram_encode_rs8(struct persistent_ram_zone *prz,
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uint8_t *data, size_t len, uint8_t *ecc)
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@ -270,54 +275,134 @@ void persistent_ram_free_old(struct persistent_ram_zone *prz)
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prz->old_log_size = 0;
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}
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static int __init __persistent_ram_init(struct persistent_ram_zone *prz,
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void __iomem *mem, size_t buffer_size, bool ecc)
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static int persistent_ram_buffer_map(phys_addr_t start, phys_addr_t size,
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struct persistent_ram_zone *prz)
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{
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struct persistent_ram_buffer *buffer = mem;
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int ret;
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struct page **pages;
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phys_addr_t page_start;
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unsigned int page_count;
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pgprot_t prot;
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unsigned int i;
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INIT_LIST_HEAD(&prz->node);
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page_start = start - offset_in_page(start);
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page_count = DIV_ROUND_UP(size + offset_in_page(start), PAGE_SIZE);
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prz->buffer = buffer;
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prz->buffer_size = buffer_size - sizeof(struct persistent_ram_buffer);
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prot = pgprot_noncached(PAGE_KERNEL);
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if (prz->buffer_size > buffer_size) {
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pr_err("persistent_ram: buffer %p, invalid size %zu, datasize %zu\n",
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buffer, buffer_size, prz->buffer_size);
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return -EINVAL;
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pages = kmalloc(sizeof(struct page *) * page_count, GFP_KERNEL);
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if (!pages) {
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pr_err("%s: Failed to allocate array for %u pages\n", __func__,
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page_count);
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return -ENOMEM;
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}
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prz->ecc = ecc;
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ret = persistent_ram_init_ecc(prz, buffer_size);
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if (ret)
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return ret;
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if (buffer->sig == PERSISTENT_RAM_SIG) {
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if (buffer->size > prz->buffer_size
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|| buffer->start > buffer->size)
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pr_info("persistent_ram: found existing invalid buffer, size %d, start %d\n",
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buffer->size, buffer->start);
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else {
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pr_info("persistent_ram: found existing buffer, size %d, start %d\n",
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buffer->size, buffer->start);
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persistent_ram_save_old(prz);
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for (i = 0; i < page_count; i++) {
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phys_addr_t addr = page_start + i * PAGE_SIZE;
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pages[i] = pfn_to_page(addr >> PAGE_SHIFT);
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}
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} else {
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pr_info("persistent_ram: no valid data in buffer (sig = 0x%08x)\n",
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buffer->sig);
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prz->vaddr = vmap(pages, page_count, VM_MAP, prot);
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kfree(pages);
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if (!prz->vaddr) {
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pr_err("%s: Failed to map %u pages\n", __func__, page_count);
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return -ENOMEM;
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}
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buffer->sig = PERSISTENT_RAM_SIG;
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buffer->start = 0;
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buffer->size = 0;
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list_add_tail(&prz->node, &zone_list);
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prz->buffer = prz->vaddr + offset_in_page(start);
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prz->buffer_size = size - sizeof(struct persistent_ram_buffer);
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return 0;
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}
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int __init persistent_ram_init_ringbuffer(struct persistent_ram_zone *prz,
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void __iomem *mem, size_t buffer_size, bool ecc)
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static int __init persistent_ram_buffer_init(const char *name,
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struct persistent_ram_zone *prz)
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{
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return __persistent_ram_init(prz, mem, buffer_size, true);
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int i;
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struct persistent_ram *ram;
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struct persistent_ram_descriptor *desc;
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phys_addr_t start;
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list_for_each_entry(ram, &persistent_ram_list, node) {
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start = ram->start;
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for (i = 0; i < ram->num_descs; i++) {
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desc = &ram->descs[i];
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if (!strcmp(desc->name, name))
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return persistent_ram_buffer_map(start,
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desc->size, prz);
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start += desc->size;
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}
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}
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return -EINVAL;
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}
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static __init
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struct persistent_ram_zone *__persistent_ram_init(struct device *dev, bool ecc)
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{
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struct persistent_ram_zone *prz;
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int ret;
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prz = kzalloc(sizeof(struct persistent_ram_zone), GFP_KERNEL);
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if (!prz) {
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pr_err("persistent_ram: failed to allocate persistent ram zone\n");
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return ERR_PTR(-ENOMEM);
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}
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INIT_LIST_HEAD(&prz->node);
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ret = persistent_ram_buffer_init(dev_name(dev), prz);
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if (ret) {
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pr_err("persistent_ram: failed to initialize buffer\n");
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return ERR_PTR(ret);
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}
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prz->ecc = ecc;
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ret = persistent_ram_init_ecc(prz, prz->buffer_size);
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if (ret)
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return ERR_PTR(ret);
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if (prz->buffer->sig == PERSISTENT_RAM_SIG) {
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if (prz->buffer->size > prz->buffer_size
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|| prz->buffer->start > prz->buffer->size)
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pr_info("persistent_ram: found existing invalid buffer, size %d, start %d\n",
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prz->buffer->size, prz->buffer->start);
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else {
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pr_info("persistent_ram: found existing buffer, size %d, start %d\n",
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prz->buffer->size, prz->buffer->start);
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persistent_ram_save_old(prz);
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}
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} else {
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pr_info("persistent_ram: no valid data in buffer (sig = 0x%08x)\n",
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prz->buffer->sig);
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}
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prz->buffer->sig = PERSISTENT_RAM_SIG;
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prz->buffer->start = 0;
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prz->buffer->size = 0;
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return prz;
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}
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struct persistent_ram_zone * __init
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persistent_ram_init_ringbuffer(struct device *dev, bool ecc)
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{
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return __persistent_ram_init(dev, ecc);
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}
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int __init persistent_ram_early_init(struct persistent_ram *ram)
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{
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int ret;
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ret = memblock_reserve(ram->start, ram->size);
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if (ret) {
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pr_err("Failed to reserve persistent memory from %08lx-%08lx\n",
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(long)ram->start, (long)(ram->start + ram->size - 1));
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return ret;
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}
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list_add_tail(&ram->node, &persistent_ram_list);
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pr_info("Initialized persistent memory from %08lx-%08lx\n",
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(long)ram->start, (long)(ram->start + ram->size - 1));
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return 0;
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}
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@ -15,13 +15,31 @@
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#ifndef __LINUX_PERSISTENT_RAM_H__
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#define __LINUX_PERSISTENT_RAM_H__
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#include <linux/device.h>
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#include <linux/kernel.h>
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#include <linux/list.h>
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#include <linux/types.h>
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struct persistent_ram_buffer;
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struct persistent_ram_descriptor {
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const char *name;
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phys_addr_t size;
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};
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struct persistent_ram {
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phys_addr_t start;
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phys_addr_t size;
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int num_descs;
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struct persistent_ram_descriptor *descs;
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struct list_head node;
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};
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struct persistent_ram_zone {
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struct list_head node;
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void *vaddr;
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struct persistent_ram_buffer *buffer;
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size_t buffer_size;
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@ -43,8 +61,10 @@ struct persistent_ram_zone {
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bool early;
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};
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int persistent_ram_init_ringbuffer(struct persistent_ram_zone *prz,
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void __iomem *buffer, size_t buffer_size, bool ecc);
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int persistent_ram_early_init(struct persistent_ram *ram);
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struct persistent_ram_zone *persistent_ram_init_ringbuffer(struct device *dev,
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bool ecc);
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int persistent_ram_write(struct persistent_ram_zone *prz, const void *s,
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unsigned int count);
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@ -24,7 +24,7 @@
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#include "persistent_ram.h"
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#include "ram_console.h"
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static struct persistent_ram_zone ram_console_zone;
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static struct persistent_ram_zone *ram_console_zone;
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static const char *bootinfo;
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static size_t bootinfo_size;
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@ -52,33 +52,13 @@ void ram_console_enable_console(int enabled)
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static int ram_console_driver_probe(struct platform_device *pdev)
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{
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struct resource *res = pdev->resource;
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size_t start;
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size_t buffer_size;
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void *buffer;
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struct ram_console_platform_data *pdata = pdev->dev.platform_data;
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int ret;
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struct persistent_ram_zone *prz;
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if (res == NULL || pdev->num_resources != 1 ||
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!(res->flags & IORESOURCE_MEM)) {
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printk(KERN_ERR "ram_console: invalid resource, %p %d flags "
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"%lx\n", res, pdev->num_resources, res ? res->flags : 0);
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return -ENXIO;
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}
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buffer_size = resource_size(res);
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start = res->start;
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printk(KERN_INFO "ram_console: got buffer at %zx, size %zx\n",
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start, buffer_size);
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buffer = ioremap(res->start, buffer_size);
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if (buffer == NULL) {
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printk(KERN_ERR "ram_console: failed to map memory\n");
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return -ENOMEM;
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}
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prz = persistent_ram_init_ringbuffer(&pdev->dev, true);
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if (IS_ERR(prz))
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return PTR_ERR(prz);
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ret = persistent_ram_init_ringbuffer(&ram_console_zone, buffer,
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buffer_size, true);
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if (ret)
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goto err;
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if (pdata) {
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bootinfo = kstrdup(pdata->bootinfo, GFP_KERNEL);
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@ -86,14 +66,12 @@ static int ram_console_driver_probe(struct platform_device *pdev)
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bootinfo_size = strlen(bootinfo);
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}
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ram_console.data = &ram_console_zone;
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ram_console_zone = prz;
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ram_console.data = prz;
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register_console(&ram_console);
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return 0;
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err:
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iounmap(buffer);
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return ret;
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return 0;
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}
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static struct platform_driver ram_console_driver = {
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@ -115,7 +93,7 @@ static ssize_t ram_console_read_old(struct file *file, char __user *buf,
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{
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loff_t pos = *offset;
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ssize_t count;
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struct persistent_ram_zone *prz = &ram_console_zone;
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struct persistent_ram_zone *prz = ram_console_zone;
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size_t old_log_size = persistent_ram_old_size(prz);
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const char *old_log = persistent_ram_old(prz);
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char *str;
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@ -170,7 +148,7 @@ static const struct file_operations ram_console_file_ops = {
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static int __init ram_console_late_init(void)
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{
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struct proc_dir_entry *entry;
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struct persistent_ram_zone *prz = &ram_console_zone;
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struct persistent_ram_zone *prz = ram_console_zone;
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if (persistent_ram_old_size(prz) == 0)
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return 0;
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