1 files changed, 517 insertions, 0 deletions

diff --git a/arch/powerpc/platforms/pseries/lpar.c b/arch/powerpc/platforms/pseries/lpar.c
new file mode 100644
index 000000000000..268d8362dde7
--- /dev/null
+++ b/arch/powerpc/platforms/pseries/lpar.c
@@ -0,0 +1,517 @@
+/*
+ * pSeries_lpar.c
+ * Copyright (C) 2001 Todd Inglett, IBM Corporation
+ *
+ * pSeries LPAR support.
+ * 
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ * 
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ * 
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
+ */
+
+#define DEBUG
+
+#include <linux/config.h>
+#include <linux/kernel.h>
+#include <linux/dma-mapping.h>
+#include <asm/processor.h>
+#include <asm/mmu.h>
+#include <asm/page.h>
+#include <asm/pgtable.h>
+#include <asm/machdep.h>
+#include <asm/abs_addr.h>
+#include <asm/mmu_context.h>
+#include <asm/ppcdebug.h>
+#include <asm/iommu.h>
+#include <asm/tlbflush.h>
+#include <asm/tlb.h>
+#include <asm/prom.h>
+#include <asm/abs_addr.h>
+#include <asm/cputable.h>
+#include <asm/plpar_wrappers.h>
+
+#ifdef DEBUG
+#define DBG(fmt...) udbg_printf(fmt)
+#else
+#define DBG(fmt...)
+#endif
+
+/* in pSeries_hvCall.S */
+EXPORT_SYMBOL(plpar_hcall);
+EXPORT_SYMBOL(plpar_hcall_4out);
+EXPORT_SYMBOL(plpar_hcall_norets);
+EXPORT_SYMBOL(plpar_hcall_8arg_2ret);
+
+extern void pSeries_find_serial_port(void);
+
+
+int vtermno;    /* virtual terminal# for udbg  */
+
+#define __ALIGNED__ __attribute__((__aligned__(sizeof(long))))
+static void udbg_hvsi_putc(unsigned char c)
+{
+        /* packet's seqno isn't used anyways */
+        uint8_t packet[] __ALIGNED__ = { 0xff, 5, 0, 0, c };
+        int rc;
+
+        if (c == '\n')
+                udbg_hvsi_putc('\r');
+
+        do {
+                rc = plpar_put_term_char(vtermno, sizeof(packet), packet);
+        } while (rc == H_Busy);
+}
+
+static long hvsi_udbg_buf_len;
+static uint8_t hvsi_udbg_buf[256];
+
+static int udbg_hvsi_getc_poll(void)
+{
+        unsigned char ch;
+        int rc, i;
+
+        if (hvsi_udbg_buf_len == 0) {
+                rc = plpar_get_term_char(vtermno, &hvsi_udbg_buf_len, hvsi_udbg_buf);
+                if (rc != H_Success || hvsi_udbg_buf[0] != 0xff) {
+                        /* bad read or non-data packet */
+                        hvsi_udbg_buf_len = 0;
+                } else {
+                        /* remove the packet header */
+                        for (i = 4; i < hvsi_udbg_buf_len; i++)
+                                hvsi_udbg_buf[i-4] = hvsi_udbg_buf[i];
+                        hvsi_udbg_buf_len -= 4;
+                }
+        }
+
+        if (hvsi_udbg_buf_len <= 0 || hvsi_udbg_buf_len > 256) {
+                /* no data ready */
+                hvsi_udbg_buf_len = 0;
+                return -1;
+        }
+
+        ch = hvsi_udbg_buf[0];
+        /* shift remaining data down */
+        for (i = 1; i < hvsi_udbg_buf_len; i++) {
+                hvsi_udbg_buf[i-1] = hvsi_udbg_buf[i];
+        }
+        hvsi_udbg_buf_len--;
+
+        return ch;
+}
+
+static unsigned char udbg_hvsi_getc(void)
+{
+        int ch;
+        for (;;) {
+                ch = udbg_hvsi_getc_poll();
+                if (ch == -1) {
+                        /* This shouldn't be needed...but... */
+                        volatile unsigned long delay;
+                        for (delay=0; delay < 2000000; delay++)
+                                ;
+                } else {
+                        return ch;
+                }
+        }
+}
+
+static void udbg_putcLP(unsigned char c)
+{
+        char buf[16];
+        unsigned long rc;
+
+        if (c == '\n')
+                udbg_putcLP('\r');
+
+        buf[0] = c;
+        do {
+                rc = plpar_put_term_char(vtermno, 1, buf);
+        } while(rc == H_Busy);
+}
+
+/* Buffered chars getc */
+static long inbuflen;
+static long inbuf[2];   /* must be 2 longs */
+
+static int udbg_getc_pollLP(void)
+{
+        /* The interface is tricky because it may return up to 16 chars.
+         * We save them statically for future calls to udbg_getc().
+         */
+        char ch, *buf = (char *)inbuf;
+        int i;
+        long rc;
+        if (inbuflen == 0) {
+                /* get some more chars. */
+                inbuflen = 0;
+                rc = plpar_get_term_char(vtermno, &inbuflen, buf);
+                if (rc != H_Success)
+                        inbuflen = 0;   /* otherwise inbuflen is garbage */
+        }
+        if (inbuflen <= 0 || inbuflen > 16) {
+                /* Catch error case as well as other oddities (corruption) */
+                inbuflen = 0;
+                return -1;
+        }
+        ch = buf[0];
+        for (i = 1; i < inbuflen; i++)  /* shuffle them down. */
+                buf[i-1] = buf[i];
+        inbuflen--;
+        return ch;
+}
+
+static unsigned char udbg_getcLP(void)
+{
+        int ch;
+        for (;;) {
+                ch = udbg_getc_pollLP();
+                if (ch == -1) {
+                        /* This shouldn't be needed...but... */
+                        volatile unsigned long delay;
+                        for (delay=0; delay < 2000000; delay++)
+                                ;
+                } else {
+                        return ch;
+                }
+        }
+}
+
+/* call this from early_init() for a working debug console on
+ * vterm capable LPAR machines
+ */
+void udbg_init_debug_lpar(void)
+{
+        vtermno = 0;
+        udbg_putc = udbg_putcLP;
+        udbg_getc = udbg_getcLP;
+        udbg_getc_poll = udbg_getc_pollLP;
+}
+
+/* returns 0 if couldn't find or use /chosen/stdout as console */
+int find_udbg_vterm(void)
+{
+        struct device_node *stdout_node;
+        u32 *termno;
+        char *name;
+        int found = 0;
+
+        /* find the boot console from /chosen/stdout */
+        if (!of_chosen)
+                return 0;
+        name = (char *)get_property(of_chosen, "linux,stdout-path", NULL);
+        if (name == NULL)
+                return 0;
+        stdout_node = of_find_node_by_path(name);
+        if (!stdout_node)
+                return 0;
+
+        /* now we have the stdout node; figure out what type of device it is. */
+        name = (char *)get_property(stdout_node, "name", NULL);
+        if (!name) {
+                printk(KERN_WARNING "stdout node missing 'name' property!\n");
+                goto out;
+        }
+
+        if (strncmp(name, "vty", 3) == 0) {
+                if (device_is_compatible(stdout_node, "hvterm1")) {
+                        termno = (u32 *)get_property(stdout_node, "reg", NULL);
+                        if (termno) {
+                                vtermno = termno[0];
+                                udbg_putc = udbg_putcLP;
+                                udbg_getc = udbg_getcLP;
+                                udbg_getc_poll = udbg_getc_pollLP;
+                                found = 1;
+                        }
+                } else if (device_is_compatible(stdout_node, "hvterm-protocol")) {
+                        termno = (u32 *)get_property(stdout_node, "reg", NULL);
+                        if (termno) {
+                                vtermno = termno[0];
+                                udbg_putc = udbg_hvsi_putc;
+                                udbg_getc = udbg_hvsi_getc;
+                                udbg_getc_poll = udbg_hvsi_getc_poll;
+                                found = 1;
+                        }
+                }
+        } else if (strncmp(name, "serial", 6)) {
+                /* XXX fix ISA serial console */
+                printk(KERN_WARNING "serial stdout on LPAR ('%s')! "
+                                "can't print udbg messages\n",
+                       stdout_node->full_name);
+        } else {
+                printk(KERN_WARNING "don't know how to print to stdout '%s'\n",
+                       stdout_node->full_name);
+        }
+
+out:
+        of_node_put(stdout_node);
+        return found;
+}
+
+void vpa_init(int cpu)
+{
+        int hwcpu = get_hard_smp_processor_id(cpu);
+        unsigned long vpa = (unsigned long)&(paca[cpu].lppaca);
+        long ret;
+        unsigned long flags;
+
+        /* Register the Virtual Processor Area (VPA) */
+        flags = 1UL << (63 - 18);
+
+        if (cpu_has_feature(CPU_FTR_ALTIVEC))
+                paca[cpu].lppaca.vmxregs_in_use = 1;
+
+        ret = register_vpa(flags, hwcpu, __pa(vpa));
+
+        if (ret)
+                printk(KERN_ERR "WARNING: vpa_init: VPA registration for "
+                                "cpu %d (hw %d) of area %lx returns %ld\n",
+                                cpu, hwcpu, __pa(vpa), ret);
+}
+
+long pSeries_lpar_hpte_insert(unsigned long hpte_group,
+                              unsigned long va, unsigned long prpn,
+                              unsigned long vflags, unsigned long rflags)
+{
+        unsigned long lpar_rc;
+        unsigned long flags;
+        unsigned long slot;
+        unsigned long hpte_v, hpte_r;
+        unsigned long dummy0, dummy1;
+
+        hpte_v = ((va >> 23) << HPTE_V_AVPN_SHIFT) | vflags | HPTE_V_VALID;
+        if (vflags & HPTE_V_LARGE)
+                hpte_v &= ~(1UL << HPTE_V_AVPN_SHIFT);
+
+        hpte_r = (prpn << HPTE_R_RPN_SHIFT) | rflags;
+
+        /* Now fill in the actual HPTE */
+        /* Set CEC cookie to 0         */
+        /* Zero page = 0               */
+        /* I-cache Invalidate = 0      */
+        /* I-cache synchronize = 0     */
+        /* Exact = 0                   */
+        flags = 0;
+
+        /* XXX why is this here? - Anton */
+        if (rflags & (_PAGE_GUARDED|_PAGE_NO_CACHE))
+                hpte_r &= ~_PAGE_COHERENT;
+
+        lpar_rc = plpar_hcall(H_ENTER, flags, hpte_group, hpte_v,
+                              hpte_r, &slot, &dummy0, &dummy1);
+
+        if (unlikely(lpar_rc == H_PTEG_Full))
+                return -1;
+
+        /*
+         * Since we try and ioremap PHBs we don't own, the pte insert
+         * will fail. However we must catch the failure in hash_page
+         * or we will loop forever, so return -2 in this case.
+         */
+        if (unlikely(lpar_rc != H_Success))
+                return -2;
+
+        /* Because of iSeries, we have to pass down the secondary
+         * bucket bit here as well
+         */
+        return (slot & 7) | (!!(vflags & HPTE_V_SECONDARY) << 3);
+}
+
+static DEFINE_SPINLOCK(pSeries_lpar_tlbie_lock);
+
+static long pSeries_lpar_hpte_remove(unsigned long hpte_group)
+{
+        unsigned long slot_offset;
+        unsigned long lpar_rc;
+        int i;
+        unsigned long dummy1, dummy2;
+
+        /* pick a random slot to start at */
+        slot_offset = mftb() & 0x7;
+
+        for (i = 0; i < HPTES_PER_GROUP; i++) {
+
+                /* don't remove a bolted entry */
+                lpar_rc = plpar_pte_remove(H_ANDCOND, hpte_group + slot_offset,
+                                           (0x1UL << 4), &dummy1, &dummy2);
+
+                if (lpar_rc == H_Success)
+                        return i;
+
+                BUG_ON(lpar_rc != H_Not_Found);
+
+                slot_offset++;
+                slot_offset &= 0x7;
+        }
+
+        return -1;
+}
+
+static void pSeries_lpar_hptab_clear(void)
+{
+        unsigned long size_bytes = 1UL << ppc64_pft_size;
+        unsigned long hpte_count = size_bytes >> 4;
+        unsigned long dummy1, dummy2;
+        int i;
+
+        /* TODO: Use bulk call */
+        for (i = 0; i < hpte_count; i++)
+                plpar_pte_remove(0, i, 0, &dummy1, &dummy2);
+}
+
+/*
+ * NOTE: for updatepp ops we are fortunate that the linux "newpp" bits and
+ * the low 3 bits of flags happen to line up.  So no transform is needed.
+ * We can probably optimize here and assume the high bits of newpp are
+ * already zero.  For now I am paranoid.
+ */
+static long pSeries_lpar_hpte_updatepp(unsigned long slot, unsigned long newpp,
+                                       unsigned long va, int large, int local)
+{
+        unsigned long lpar_rc;
+        unsigned long flags = (newpp & 7) | H_AVPN;
+        unsigned long avpn = va >> 23;
+
+        if (large)
+                avpn &= ~0x1UL;
+
+        lpar_rc = plpar_pte_protect(flags, slot, (avpn << 7));
+
+        if (lpar_rc == H_Not_Found)
+                return -1;
+
+        BUG_ON(lpar_rc != H_Success);
+
+        return 0;
+}
+
+static unsigned long pSeries_lpar_hpte_getword0(unsigned long slot)
+{
+        unsigned long dword0;
+        unsigned long lpar_rc;
+        unsigned long dummy_word1;
+        unsigned long flags;
+
+        /* Read 1 pte at a time                        */
+        /* Do not need RPN to logical page translation */
+        /* No cross CEC PFT access                     */
+        flags = 0;
+
+        lpar_rc = plpar_pte_read(flags, slot, &dword0, &dummy_word1);
+
+        BUG_ON(lpar_rc != H_Success);
+
+        return dword0;
+}
+
+static long pSeries_lpar_hpte_find(unsigned long vpn)
+{
+        unsigned long hash;
+        unsigned long i, j;
+        long slot;
+        unsigned long hpte_v;
+
+        hash = hpt_hash(vpn, 0);
+
+        for (j = 0; j < 2; j++) {
+                slot = (hash & htab_hash_mask) * HPTES_PER_GROUP;
+                for (i = 0; i < HPTES_PER_GROUP; i++) {
+                        hpte_v = pSeries_lpar_hpte_getword0(slot);
+
+                        if ((HPTE_V_AVPN_VAL(hpte_v) == (vpn >> 11))
+                            && (hpte_v & HPTE_V_VALID)
+                            && (!!(hpte_v & HPTE_V_SECONDARY) == j)) {
+                                /* HPTE matches */
+                                if (j)
+                                        slot = -slot;
+                                return slot;
+                        }
+                        ++slot;
+                }
+                hash = ~hash;
+        }
+
+        return -1;
+} 
+
+static void pSeries_lpar_hpte_updateboltedpp(unsigned long newpp,
+                                             unsigned long ea)
+{
+        unsigned long lpar_rc;
+        unsigned long vsid, va, vpn, flags;
+        long slot;
+
+        vsid = get_kernel_vsid(ea);
+        va = (vsid << 28) | (ea & 0x0fffffff);
+        vpn = va >> PAGE_SHIFT;
+
+        slot = pSeries_lpar_hpte_find(vpn);
+        BUG_ON(slot == -1);
+
+        flags = newpp & 7;
+        lpar_rc = plpar_pte_protect(flags, slot, 0);
+
+        BUG_ON(lpar_rc != H_Success);
+}
+
+static void pSeries_lpar_hpte_invalidate(unsigned long slot, unsigned long va,
+                                         int large, int local)
+{
+        unsigned long avpn = va >> 23;
+        unsigned long lpar_rc;
+        unsigned long dummy1, dummy2;
+
+        if (large)
+                avpn &= ~0x1UL;
+
+        lpar_rc = plpar_pte_remove(H_AVPN, slot, (avpn << 7), &dummy1,
+                                   &dummy2);
+
+        if (lpar_rc == H_Not_Found)
+                return;
+
+        BUG_ON(lpar_rc != H_Success);
+}
+
+/*
+ * Take a spinlock around flushes to avoid bouncing the hypervisor tlbie
+ * lock.
+ */
+void pSeries_lpar_flush_hash_range(unsigned long number, int local)
+{
+        int i;
+        unsigned long flags = 0;
+        struct ppc64_tlb_batch *batch = &__get_cpu_var(ppc64_tlb_batch);
+        int lock_tlbie = !cpu_has_feature(CPU_FTR_LOCKLESS_TLBIE);
+
+        if (lock_tlbie)
+                spin_lock_irqsave(&pSeries_lpar_tlbie_lock, flags);
+
+        for (i = 0; i < number; i++)
+                flush_hash_page(batch->vaddr[i], batch->pte[i], local);
+
+        if (lock_tlbie)
+                spin_unlock_irqrestore(&pSeries_lpar_tlbie_lock, flags);
+}
+
+void hpte_init_lpar(void)
+{
+        ppc_md.hpte_invalidate  = pSeries_lpar_hpte_invalidate;
+        ppc_md.hpte_updatepp    = pSeries_lpar_hpte_updatepp;
+        ppc_md.hpte_updateboltedpp = pSeries_lpar_hpte_updateboltedpp;
+        ppc_md.hpte_insert      = pSeries_lpar_hpte_insert;
+        ppc_md.hpte_remove      = pSeries_lpar_hpte_remove;
+        ppc_md.flush_hash_range = pSeries_lpar_flush_hash_range;
+        ppc_md.hpte_clear_all   = pSeries_lpar_hptab_clear;
+
+        htab_finish_init();
+}