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https://github.com/torvalds/linux.git
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[SPARC64]: Rewrite convoluted physical memory probing.
Delete all of the code working with sp_banks[] and replace with clean acquisition and sorting of physical memory parameters from the firmware. Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
David S. Miller
parent
ed3ffaf7b5
commit
13edad7a5c
@ -1333,7 +1333,7 @@ static int cheetah_check_main_memory(unsigned long paddr)
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{
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unsigned long vaddr = PAGE_OFFSET + paddr;
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if (vaddr > high_memory)
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if (vaddr > (unsigned long) high_memory)
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return 0;
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return kern_addr_valid(vaddr);
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@ -21,6 +21,7 @@
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#include <linux/seq_file.h>
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#include <linux/kprobes.h>
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#include <linux/cache.h>
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#include <linux/sort.h>
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#include <asm/head.h>
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#include <asm/system.h>
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@ -41,14 +42,72 @@
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extern void device_scan(void);
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struct sparc_phys_banks {
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unsigned long base_addr;
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unsigned long num_bytes;
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};
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#define MAX_BANKS 32
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#define SPARC_PHYS_BANKS 32
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static struct linux_prom64_registers pavail[MAX_BANKS] __initdata;
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static struct linux_prom64_registers pavail_rescan[MAX_BANKS] __initdata;
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static int pavail_ents __initdata;
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static int pavail_rescan_ents __initdata;
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static struct sparc_phys_banks sp_banks[SPARC_PHYS_BANKS];
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static int cmp_p64(const void *a, const void *b)
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{
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const struct linux_prom64_registers *x = a, *y = b;
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if (x->phys_addr > y->phys_addr)
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return 1;
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if (x->phys_addr < y->phys_addr)
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return -1;
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return 0;
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}
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static void __init read_obp_memory(const char *property,
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struct linux_prom64_registers *regs,
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int *num_ents)
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{
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int node = prom_finddevice("/memory");
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int prop_size = prom_getproplen(node, property);
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int ents, ret, i;
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ents = prop_size / sizeof(struct linux_prom64_registers);
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if (ents > MAX_BANKS) {
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prom_printf("The machine has more %s property entries than "
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"this kernel can support (%d).\n",
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property, MAX_BANKS);
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prom_halt();
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}
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ret = prom_getproperty(node, property, (char *) regs, prop_size);
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if (ret == -1) {
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prom_printf("Couldn't get %s property from /memory.\n");
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prom_halt();
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}
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*num_ents = ents;
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/* Sanitize what we got from the firmware, by page aligning
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* everything.
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*/
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for (i = 0; i < ents; i++) {
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unsigned long base, size;
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base = regs[i].phys_addr;
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size = regs[i].reg_size;
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size &= PAGE_MASK;
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if (base & ~PAGE_MASK) {
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unsigned long new_base = PAGE_ALIGN(base);
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size -= new_base - base;
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if ((long) size < 0L)
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size = 0UL;
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base = new_base;
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}
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regs[i].phys_addr = base;
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regs[i].reg_size = size;
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}
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sort(regs, ents, sizeof(struct linux_prom64_registers),
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cmp_p64, NULL);
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}
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unsigned long *sparc64_valid_addr_bitmap __read_mostly;
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@ -1213,14 +1272,14 @@ unsigned long __init bootmem_init(unsigned long *pages_avail)
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int i;
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#ifdef CONFIG_DEBUG_BOOTMEM
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prom_printf("bootmem_init: Scan sp_banks, ");
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prom_printf("bootmem_init: Scan pavail, ");
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#endif
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bytes_avail = 0UL;
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for (i = 0; sp_banks[i].num_bytes != 0; i++) {
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end_of_phys_memory = sp_banks[i].base_addr +
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sp_banks[i].num_bytes;
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bytes_avail += sp_banks[i].num_bytes;
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for (i = 0; i < pavail_ents; i++) {
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end_of_phys_memory = pavail[i].phys_addr +
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pavail[i].reg_size;
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bytes_avail += pavail[i].reg_size;
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if (cmdline_memory_size) {
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if (bytes_avail > cmdline_memory_size) {
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unsigned long slack = bytes_avail - cmdline_memory_size;
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@ -1228,12 +1287,15 @@ unsigned long __init bootmem_init(unsigned long *pages_avail)
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bytes_avail -= slack;
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end_of_phys_memory -= slack;
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sp_banks[i].num_bytes -= slack;
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if (sp_banks[i].num_bytes == 0) {
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sp_banks[i].base_addr = 0xdeadbeef;
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pavail[i].reg_size -= slack;
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if ((long)pavail[i].reg_size <= 0L) {
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pavail[i].phys_addr = 0xdeadbeefUL;
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pavail[i].reg_size = 0UL;
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pavail_ents = i;
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} else {
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sp_banks[i+1].num_bytes = 0;
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sp_banks[i+1].base_addr = 0xdeadbeef;
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pavail[i+1].reg_size = 0Ul;
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pavail[i+1].phys_addr = 0xdeadbeefUL;
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pavail_ents = i + 1;
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}
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break;
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}
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@ -1287,12 +1349,12 @@ unsigned long __init bootmem_init(unsigned long *pages_avail)
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/* Now register the available physical memory with the
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* allocator.
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*/
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for (i = 0; sp_banks[i].num_bytes != 0; i++) {
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for (i = 0; i < pavail_ents; i++) {
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#ifdef CONFIG_DEBUG_BOOTMEM
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prom_printf("free_bootmem(sp_banks:%d): base[%lx] size[%lx]\n",
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i, sp_banks[i].base_addr, sp_banks[i].num_bytes);
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prom_printf("free_bootmem(pavail:%d): base[%lx] size[%lx]\n",
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i, pavail[i].phys_addr, pavail[i].reg_size);
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#endif
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free_bootmem(sp_banks[i].base_addr, sp_banks[i].num_bytes);
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free_bootmem(pavail[i].phys_addr, pavail[i].reg_size);
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}
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#ifdef CONFIG_BLK_DEV_INITRD
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@ -1341,7 +1403,7 @@ static unsigned long kernel_map_range(unsigned long pstart, unsigned long pend,
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unsigned long alloc_bytes = 0UL;
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if ((vstart & ~PAGE_MASK) || (vend & ~PAGE_MASK)) {
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prom_printf("kernel_map: Unaligned sp_banks[%lx:%lx]\n",
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prom_printf("kernel_map: Unaligned physmem[%lx:%lx]\n",
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vstart, vend);
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prom_halt();
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}
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@ -1388,23 +1450,24 @@ static unsigned long kernel_map_range(unsigned long pstart, unsigned long pend,
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return alloc_bytes;
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}
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extern struct linux_mlist_p1275 *prom_ptot_ptr;
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static struct linux_prom64_registers pall[MAX_BANKS] __initdata;
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static int pall_ents __initdata;
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extern unsigned int kvmap_linear_patch[1];
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static void __init kernel_physical_mapping_init(void)
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{
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struct linux_mlist_p1275 *p = prom_ptot_ptr;
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unsigned long mem_alloced = 0UL;
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unsigned long i, mem_alloced = 0UL;
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while (p) {
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read_obp_memory("reg", &pall[0], &pall_ents);
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for (i = 0; i < pall_ents; i++) {
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unsigned long phys_start, phys_end;
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phys_start = p->start_adr;
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phys_end = phys_start + p->num_bytes;
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phys_start = pall[i].phys_addr;
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phys_end = phys_start + pall[i].reg_size;
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mem_alloced += kernel_map_range(phys_start, phys_end,
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PAGE_KERNEL);
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p = p->theres_more;
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}
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printk("Allocated %ld bytes for kernel page tables.\n",
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@ -1434,62 +1497,16 @@ void kernel_map_pages(struct page *page, int numpages, int enable)
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unsigned long __init find_ecache_flush_span(unsigned long size)
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{
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unsigned long i;
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int i;
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for (i = 0; ; i++) {
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if (sp_banks[i].num_bytes == 0)
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break;
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if (sp_banks[i].num_bytes >= size)
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return sp_banks[i].base_addr;
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for (i = 0; i < pavail_ents; i++) {
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if (pavail[i].reg_size >= size)
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return pavail[i].phys_addr;
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}
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return ~0UL;
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}
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static void __init prom_probe_memory(void)
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{
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struct linux_mlist_p1275 *mlist;
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unsigned long bytes, base_paddr, tally;
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int i;
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i = 0;
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mlist = *prom_meminfo()->p1275_available;
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bytes = tally = mlist->num_bytes;
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base_paddr = mlist->start_adr;
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sp_banks[0].base_addr = base_paddr;
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sp_banks[0].num_bytes = bytes;
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while (mlist->theres_more != (void *) 0) {
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i++;
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mlist = mlist->theres_more;
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bytes = mlist->num_bytes;
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tally += bytes;
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if (i >= SPARC_PHYS_BANKS-1) {
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printk ("The machine has more banks than "
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"this kernel can support\n"
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"Increase the SPARC_PHYS_BANKS "
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"setting (currently %d)\n",
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SPARC_PHYS_BANKS);
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i = SPARC_PHYS_BANKS-1;
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break;
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}
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sp_banks[i].base_addr = mlist->start_adr;
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sp_banks[i].num_bytes = mlist->num_bytes;
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}
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i++;
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sp_banks[i].base_addr = 0xdeadbeefbeefdeadUL;
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sp_banks[i].num_bytes = 0;
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/* Now mask all bank sizes on a page boundary, it is all we can
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* use anyways.
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*/
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for (i = 0; sp_banks[i].num_bytes != 0; i++)
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sp_banks[i].num_bytes &= PAGE_MASK;
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}
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/* paging_init() sets up the page tables */
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extern void cheetah_ecache_flush_init(void);
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@ -1502,17 +1519,13 @@ void __init paging_init(void)
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unsigned long end_pfn, pages_avail, shift;
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unsigned long real_end, i;
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prom_probe_memory();
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/* Find available physical memory... */
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read_obp_memory("available", &pavail[0], &pavail_ents);
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phys_base = 0xffffffffffffffffUL;
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for (i = 0; sp_banks[i].num_bytes != 0; i++) {
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unsigned long top;
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for (i = 0; i < pavail_ents; i++)
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phys_base = min(phys_base, pavail[i].phys_addr);
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if (sp_banks[i].base_addr < phys_base)
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phys_base = sp_banks[i].base_addr;
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top = sp_banks[i].base_addr +
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sp_banks[i].num_bytes;
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}
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pfn_base = phys_base >> PAGE_SHIFT;
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kern_base = (prom_boot_mapping_phys_low >> 22UL) << 22UL;
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@ -1588,128 +1601,35 @@ void __init paging_init(void)
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device_scan();
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}
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/* Ok, it seems that the prom can allocate some more memory chunks
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* as a side effect of some prom calls we perform during the
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* boot sequence. My most likely theory is that it is from the
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* prom_set_traptable() call, and OBP is allocating a scratchpad
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* for saving client program register state etc.
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*/
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static void __init sort_memlist(struct linux_mlist_p1275 *thislist)
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{
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int swapi = 0;
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int i, mitr;
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unsigned long tmpaddr, tmpsize;
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unsigned long lowest;
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for (i = 0; thislist[i].theres_more != 0; i++) {
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lowest = thislist[i].start_adr;
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for (mitr = i+1; thislist[mitr-1].theres_more != 0; mitr++)
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if (thislist[mitr].start_adr < lowest) {
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lowest = thislist[mitr].start_adr;
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swapi = mitr;
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}
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if (lowest == thislist[i].start_adr)
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continue;
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tmpaddr = thislist[swapi].start_adr;
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tmpsize = thislist[swapi].num_bytes;
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for (mitr = swapi; mitr > i; mitr--) {
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thislist[mitr].start_adr = thislist[mitr-1].start_adr;
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thislist[mitr].num_bytes = thislist[mitr-1].num_bytes;
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}
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thislist[i].start_adr = tmpaddr;
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thislist[i].num_bytes = tmpsize;
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}
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}
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void __init rescan_sp_banks(void)
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{
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struct linux_prom64_registers memlist[64];
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struct linux_mlist_p1275 avail[64], *mlist;
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unsigned long bytes, base_paddr;
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int num_regs, node = prom_finddevice("/memory");
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int i;
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num_regs = prom_getproperty(node, "available",
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(char *) memlist, sizeof(memlist));
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num_regs = (num_regs / sizeof(struct linux_prom64_registers));
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for (i = 0; i < num_regs; i++) {
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avail[i].start_adr = memlist[i].phys_addr;
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avail[i].num_bytes = memlist[i].reg_size;
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avail[i].theres_more = &avail[i + 1];
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}
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avail[i - 1].theres_more = NULL;
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sort_memlist(avail);
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mlist = &avail[0];
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i = 0;
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bytes = mlist->num_bytes;
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base_paddr = mlist->start_adr;
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sp_banks[0].base_addr = base_paddr;
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sp_banks[0].num_bytes = bytes;
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while (mlist->theres_more != NULL){
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i++;
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mlist = mlist->theres_more;
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bytes = mlist->num_bytes;
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if (i >= SPARC_PHYS_BANKS-1) {
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printk ("The machine has more banks than "
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"this kernel can support\n"
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"Increase the SPARC_PHYS_BANKS "
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"setting (currently %d)\n",
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SPARC_PHYS_BANKS);
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i = SPARC_PHYS_BANKS-1;
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break;
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}
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sp_banks[i].base_addr = mlist->start_adr;
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sp_banks[i].num_bytes = mlist->num_bytes;
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}
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i++;
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sp_banks[i].base_addr = 0xdeadbeefbeefdeadUL;
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sp_banks[i].num_bytes = 0;
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for (i = 0; sp_banks[i].num_bytes != 0; i++)
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sp_banks[i].num_bytes &= PAGE_MASK;
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}
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static void __init taint_real_pages(void)
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{
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struct sparc_phys_banks saved_sp_banks[SPARC_PHYS_BANKS];
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int i;
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for (i = 0; i < SPARC_PHYS_BANKS; i++) {
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saved_sp_banks[i].base_addr =
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sp_banks[i].base_addr;
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saved_sp_banks[i].num_bytes =
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sp_banks[i].num_bytes;
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}
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read_obp_memory("available", &pavail_rescan[0], &pavail_rescan_ents);
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rescan_sp_banks();
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/* Find changes discovered in the sp_bank rescan and
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/* Find changes discovered in the physmem available rescan and
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* reserve the lost portions in the bootmem maps.
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*/
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for (i = 0; saved_sp_banks[i].num_bytes; i++) {
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for (i = 0; i < pavail_ents; i++) {
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unsigned long old_start, old_end;
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old_start = saved_sp_banks[i].base_addr;
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old_start = pavail[i].phys_addr;
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old_end = old_start +
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saved_sp_banks[i].num_bytes;
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pavail[i].reg_size;
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while (old_start < old_end) {
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int n;
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for (n = 0; sp_banks[n].num_bytes; n++) {
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for (n = 0; pavail_rescan_ents; n++) {
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unsigned long new_start, new_end;
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new_start = sp_banks[n].base_addr;
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new_end = new_start + sp_banks[n].num_bytes;
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new_start = pavail_rescan[n].phys_addr;
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new_end = new_start +
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pavail_rescan[n].reg_size;
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if (new_start <= old_start &&
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new_end >= (old_start + PAGE_SIZE)) {
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set_bit (old_start >> 22,
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sparc64_valid_addr_bitmap);
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set_bit(old_start >> 22,
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sparc64_valid_addr_bitmap);
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goto do_next_page;
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}
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}
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@ -186,8 +186,8 @@ struct linux_prom_registers {
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};
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struct linux_prom64_registers {
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long phys_addr;
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long reg_size;
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unsigned long phys_addr;
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unsigned long reg_size;
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};
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struct linux_prom_irqs {
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