Merge with 2.4.0-test3-pre4.

5 files changed, 55 insertions, 47 deletions

diff --git a/arch/sparc64/kernel/irq.c b/arch/sparc64/kernel/irq.c
index eb6f789f6..a4904efb3 100644
--- a/arch/sparc64/kernel/irq.c
+++ b/arch/sparc64/kernel/irq.c
@@ -1,4 +1,4 @@
-/* $Id: irq.c,v 1.87 2000/05/09 17:40:13 davem Exp $
+/* $Id: irq.c,v 1.88 2000/06/26 19:40:27 davem Exp $
  * irq.c: UltraSparc IRQ handling/init/registry.
  *
  * Copyright (C) 1997  David S. Miller  (davem@caip.rutgers.edu)
@@ -62,6 +62,19 @@ unsigned int __up_workvec[16] __attribute__ ((aligned (64)));
 #define irq_work(__cpu, __pil)	&(cpu_data[(__cpu)].irq_worklists[(__pil)])
 #endif
 
+#ifdef CONFIG_PCI
+/* This is a table of physical addresses used to deal with SA_DMA_SYNC.
+ * It is used for PCI only to synchronize DMA transfers with IRQ delivery
+ * for devices behind busses other than APB on Sabre systems.
+ *
+ * Currently these physical addresses are just config space accesses
+ * to the command register for that device.
+ */
+unsigned long pci_dma_wsync;
+unsigned long dma_sync_reg_table[256];
+unsigned char dma_sync_reg_table_entry = 0;
+#endif
+
 /* This is based upon code in the 32-bit Sparc kernel written mostly by
  * David Redman (djhr@tadpole.co.uk).
  */
@@ -280,8 +293,6 @@ int request_irq(unsigned int irq, void (*handler)(int, void *, struct pt_regs *)
 			/*
 			 * Check wether we _should_ use DMA Write Sync
 			 * (for devices behind bridges behind APB). 
-			 *
-			 * XXX: Not implemented, yet.
 			 */
 			if (bucket->flags & IBF_DMA_SYNC)
 				irqflags |= SA_DMA_SYNC;
@@ -719,14 +730,14 @@ void handler_irq(int irq, struct pt_regs *regs)
 	/* 'cpu' is the MID (ie. UPAID), calculate the MID
 	 * of our buddy.
 	 */
-	if(should_forward != 0) {
+	if (should_forward != 0) {
 		buddy = cpu_number_map(cpu) + 1;
 		if (buddy >= NR_CPUS ||
 		    (buddy = cpu_logical_map(buddy)) == -1)
 			buddy = cpu_logical_map(0);
 
 		/* Voo-doo programming. */
-		if(cpu_data[buddy].idle_volume < FORWARD_VOLUME)
+		if (cpu_data[buddy].idle_volume < FORWARD_VOLUME)
 			should_forward = 0;
 		buddy <<= 26;
 	}
@@ -752,25 +763,29 @@ void handler_irq(int irq, struct pt_regs *regs)
 #else
 	bp = __bucket(xchg32(irq_work(cpu, irq), 0));
 #endif
-	for( ; bp != NULL; bp = nbp) {
+	for ( ; bp != NULL; bp = nbp) {
 		unsigned char flags = bp->flags;
 
 		nbp = __bucket(bp->irq_chain);
-		if((flags & IBF_ACTIVE) != 0) {
-			if((flags & IBF_MULTI) == 0) {
+		if ((flags & IBF_ACTIVE) != 0) {
+			if ((flags & IBF_DMA_SYNC) != 0) {
+				upa_readl(dma_sync_reg_table[bp->synctab_ent]);
+				upa_readq(pci_dma_wsync);
+			}
+			if ((flags & IBF_MULTI) == 0) {
 				struct irqaction *ap = bp->irq_info;
 				ap->handler(__irq(bp), ap->dev_id, regs);
 			} else {
 				void **vector = (void **)bp->irq_info;
 				int ent;
-				for(ent = 0; ent < 4; ent++) {
+				for (ent = 0; ent < 4; ent++) {
 					struct irqaction *ap = vector[ent];
-					if(ap != NULL)
+					if (ap != NULL)
 						ap->handler(__irq(bp), ap->dev_id, regs);
 				}
 			}
 			/* Only the dummy bucket lacks IMAP/ICLR. */
-			if(bp->pil != 0) {
+			if (bp->pil != 0) {
 #ifdef CONFIG_SMP
 				/* Ok, here is what is going on:
 				 * 1) Retargeting IRQs on Starfire is very
diff --git a/arch/sparc64/kernel/pci_sabre.c b/arch/sparc64/kernel/pci_sabre.c
index 99f7ba8ad..f3a5adbec 100644
--- a/arch/sparc64/kernel/pci_sabre.c
+++ b/arch/sparc64/kernel/pci_sabre.c
@@ -1,4 +1,4 @@
-/* $Id: pci_sabre.c,v 1.19 2000/04/15 13:07:51 davem Exp $
+/* $Id: pci_sabre.c,v 1.20 2000/06/26 19:40:27 davem Exp $
  * pci_sabre.c: Sabre specific PCI controller support.
  *
  * Copyright (C) 1997, 1998, 1999 David S. Miller (davem@caipfs.rutgers.edu)
@@ -641,14 +641,28 @@ static unsigned int __init sabre_irq_build(struct pci_controller_info *p,
 	bucket = __bucket(build_irq(pil, inofixup, iclr, imap));
 	bucket->flags |= IBF_PCI;
 
-	/* XXX We still need to code up support for this in irq.c
-	 * XXX It's easy to code up since only one SIMBA can exist
-	 * XXX in a machine and this is where the sync register is. -DaveM
-	 */
 	if (pdev) {
 		struct pcidev_cookie *pcp = pdev->sysdata;
-		if (pdev->bus->number != pcp->pbm->pci_first_busno)
+
+		/* When a device lives behind a bridge deeper in the
+		 * PCI bus topology than APB, a special sequence must
+		 * run to make sure all pending DMA transfers at the
+		 * time of IRQ delivery are visible in the coherency
+		 * domain by the cpu.  This sequence is to perform
+		 * a read on the far side of the non-APB bridge, then
+		 * perform a read of Sabre's DMA write-sync register.
+		 *
+		 * Currently, the PCI_CONFIG register for the device
+		 * is used for this read from the far side of the bridge.
+		 */
+		if (pdev->bus->number != pcp->pbm->pci_first_busno) {
 			bucket->flags |= IBF_DMA_SYNC;
+			bucket->synctab_ent = dma_sync_reg_table_entry++;
+			dma_sync_reg_table[bucket->synctab_ent] =
+				(unsigned long) sabre_pci_config_mkaddr(
+					pcp->pbm,
+					pdev->bus->number, pdev->devfn, PCI_COMMAND);
+		}
 	}
 	return __irq(bucket);
 }
@@ -1399,7 +1413,10 @@ void __init sabre_init(int pnode)
 	 * First REG in property is base of entire SABRE register space.
 	 */
 	p->controller_regs = pr_regs[0].phys_addr;
-	printk("PCI: Found SABRE, main regs at %016lx\n", p->controller_regs);
+	pci_dma_wsync = p->controller_regs + SABRE_WRSYNC;
+
+	printk("PCI: Found SABRE, main regs at %016lx, wsync at %016lx\n",
+	       p->controller_regs, pci_dma_wsync);
 
 	/* Error interrupts are enabled later after the bus scan. */
 	sabre_write(p->controller_regs + SABRE_PCICTRL,
diff --git a/arch/sparc64/kernel/sys_sparc.c b/arch/sparc64/kernel/sys_sparc.c
index 2aff3033a..42ba3907b 100644
--- a/arch/sparc64/kernel/sys_sparc.c
+++ b/arch/sparc64/kernel/sys_sparc.c
@@ -1,4 +1,4 @@
-/* $Id: sys_sparc.c,v 1.41 2000/06/22 11:42:25 davem Exp $
+/* $Id: sys_sparc.c,v 1.42 2000/06/26 23:20:24 davem Exp $
  * linux/arch/sparc64/kernel/sys_sparc.c
  *
  * This file contains various random system calls that
@@ -92,14 +92,12 @@ asmlinkage int sparc_pipe(struct pt_regs *regs)
 	int fd[2];
 	int error;
 
-	lock_kernel();
 	error = do_pipe(fd);
 	if (error)
 		goto out;
 	regs->u_regs[UREG_I1] = fd[1];
 	error = fd[0];
 out:
-	unlock_kernel();
 	return error;
 }
 
@@ -227,8 +225,6 @@ asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len,
 	len = PAGE_ALIGN(len);
 	retval = -EINVAL;
 
-	lock_kernel();
-
 	if (current->thread.flags & SPARC_FLAG_32BIT) {
 		if (len > 0xf0000000UL ||
 		    ((flags & MAP_FIXED) && addr > 0xf0000000UL - len))
@@ -245,7 +241,6 @@ asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len,
 	up(&current->mm->mmap_sem);
 
 out_putf:
-	unlock_kernel();
 	if (file)
 		fput(file);
 out:
diff --git a/arch/sparc64/kernel/sys_sparc32.c b/arch/sparc64/kernel/sys_sparc32.c
index e27892de3..607633aec 100644
--- a/arch/sparc64/kernel/sys_sparc32.c
+++ b/arch/sparc64/kernel/sys_sparc32.c
@@ -1,4 +1,4 @@
-/* $Id: sys_sparc32.c,v 1.152 2000/06/22 17:44:47 davem Exp $
+/* $Id: sys_sparc32.c,v 1.153 2000/06/26 23:20:24 davem Exp $
  * sys_sparc32.c: Conversion between 32bit and 64bit native syscalls.
  *
  * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
@@ -1266,14 +1266,12 @@ asmlinkage int old32_readdir(unsigned int fd, struct old_linux_dirent32 *dirent,
 	buf.count = 0;
 	buf.dirent = dirent;
 
-	lock_kernel();
 	error = vfs_readdir(file, fillonedir, &buf);
 	if (error < 0)
 		goto out_putf;
 	error = buf.count;
 
 out_putf:
-	unlock_kernel();
 	fput(file);
 out:
 	return error;
@@ -1333,7 +1331,6 @@ asmlinkage int sys32_getdents(unsigned int fd, struct linux_dirent32 *dirent, un
 	buf.count = count;
 	buf.error = 0;
 
-	lock_kernel();
 	error = vfs_readdir(file, filldir, &buf);
 	if (error < 0)
 		goto out_putf;
@@ -1344,7 +1341,6 @@ asmlinkage int sys32_getdents(unsigned int fd, struct linux_dirent32 *dirent, un
 		error = count - buf.count;
 	}
 out_putf:
-	unlock_kernel();
 	fput(file);
 out:
 	return error;
@@ -1587,7 +1583,6 @@ asmlinkage int sys32_newstat(char * filename, struct stat32 *statbuf)
 	struct nameidata nd;
 	int error;
 
-	lock_kernel();
 	error = user_path_walk(filename, &nd);
 	if (!error) {
 		struct inode *inode = nd.dentry->d_inode;
@@ -1602,7 +1597,6 @@ asmlinkage int sys32_newstat(char * filename, struct stat32 *statbuf)
 
 		path_release(&nd);
 	}
-	unlock_kernel();
 	return error;
 }
 
@@ -1611,7 +1605,6 @@ asmlinkage int sys32_newlstat(char * filename, struct stat32 *statbuf)
 	struct nameidata nd;
 	int error;
 
-	lock_kernel();
 	error = user_path_walk_link(filename, &nd);
 	if (!error) {
 		struct inode *inode = nd.dentry->d_inode;
@@ -1626,7 +1619,6 @@ asmlinkage int sys32_newlstat(char * filename, struct stat32 *statbuf)
 
 		path_release(&nd);
 	}
-	unlock_kernel();
 	return error;
 }
 
@@ -1635,15 +1627,13 @@ asmlinkage int sys32_newfstat(unsigned int fd, struct stat32 *statbuf)
 	struct file *f;
 	int err = -EBADF;
 
-	lock_kernel();
 	f = fget(fd);
 	if (f) {
-		struct dentry *dentry = f->f_dentry;
-		struct inode *inode = dentry->d_inode;
+		struct inode *inode = f->f_dentry->d_inode;
 
 		if (inode->i_op &&
 		    inode->i_op->revalidate)
-			err = inode->i_op->revalidate(dentry);
+			err = inode->i_op->revalidate(f->f_dentry);
 		else
 			err = 0;
 		if (!err)
@@ -1651,7 +1641,6 @@ asmlinkage int sys32_newfstat(unsigned int fd, struct stat32 *statbuf)
 
 		fput(f);
 	}
-	unlock_kernel();
 	return err;
 }
 
diff --git a/arch/sparc64/kernel/sys_sunos32.c b/arch/sparc64/kernel/sys_sunos32.c
index 70adfe21a..bad3d5e2f 100644
--- a/arch/sparc64/kernel/sys_sunos32.c
+++ b/arch/sparc64/kernel/sys_sunos32.c
@@ -1,4 +1,4 @@
-/* $Id: sys_sunos32.c,v 1.49 2000/06/22 11:42:25 davem Exp $
+/* $Id: sys_sunos32.c,v 1.50 2000/06/26 23:20:24 davem Exp $
  * sys_sunos32.c: SunOS binary compatability layer on sparc64.
  *
  * Copyright (C) 1995, 1996, 1997 David S. Miller (davem@caip.rutgers.edu)
@@ -68,7 +68,6 @@ asmlinkage u32 sunos_mmap(u32 addr, u32 len, u32 prot, u32 flags, u32 fd, u32 of
 	struct file *file = NULL;
 	unsigned long retval, ret_type;
 
-	lock_kernel();
 	if(flags & MAP_NORESERVE) {
 		static int cnt;
 		if (cnt++ < 10)
@@ -113,7 +112,6 @@ out_putf:
 	if (file)
 		fput(file);
 out:
-	unlock_kernel();
 	return (u32) retval;
 }
 
@@ -321,8 +319,6 @@ asmlinkage int sunos_getdents(unsigned int fd, u32 u_dirent, int cnt)
 	if(!file)
 		goto out;
 
-	lock_kernel();
-
 	error = -EINVAL;
 	if(cnt < (sizeof(struct sunos_dirent) + 255))
 		goto out_putf;
@@ -344,7 +340,6 @@ asmlinkage int sunos_getdents(unsigned int fd, u32 u_dirent, int cnt)
 	}
 
 out_putf:
-	unlock_kernel();
 	fput(file);
 out:
 	return error;
@@ -406,8 +401,6 @@ asmlinkage int sunos_getdirentries(unsigned int fd, u32 u_dirent,
 	if(!file)
 		goto out;
 
-	lock_kernel();
-
 	error = -EINVAL;
 	if(cnt < (sizeof(struct sunos_direntry) + 255))
 		goto out_putf;
@@ -429,7 +422,6 @@ asmlinkage int sunos_getdirentries(unsigned int fd, u32 u_dirent,
 	}
 
 out_putf:
-	unlock_kernel();
 	fput(file);
 out:
 	return error;