patch-2.4.0-test12 linux/arch/parisc/kernel/pci-dma.c

• Lines: 548
• Date: Tue Dec 5 12:29:39 2000
• Orig file: v2.4.0-test11/linux/arch/parisc/kernel/pci-dma.c
• Orig date: Wed Dec 31 16:00:00 1969

diff -u --recursive --new-file v2.4.0-test11/linux/arch/parisc/kernel/pci-dma.c linux/arch/parisc/kernel/pci-dma.c
@@ -0,0 +1,547 @@
+/*
+** Dynamic DMA mapping support.
+** See Documentation/DMA-mapping.txt for interface definitions.
+**
+**      (c) Copyright 1999,2000 Hewlett-Packard Company
+**      (c) Copyright 2000 Grant Grundler
+**	(c) Copyright 2000 Philipp Rumpf <prumpf@tux.org>
+**      (c) Copyright 2000 John Marvin
+**
+** This implementation is for PA-RISC platforms that do not support
+** I/O TLBs (aka DMA address translation hardware).
+**
+** "leveraged" from 2.3.47: arch/ia64/kernel/pci-dma.c.
+** (I assume it's from David Mosberger-Tang but there was no Copyright)
+**
+** AFAIK, all PA7100LC and PA7300LC platforms can use this code.
+** All PA2.0 machines but V-class can alias xxx_alloc_consistent()
+** to use regular cacheable memory.
+**
+** - ggg
+*/
+
+#include <linux/types.h>
+#include <linux/mm.h>
+#include <linux/string.h>
+#include <linux/pci.h>
+#include <linux/init.h>
+
+#include <linux/malloc.h>
+#include <linux/vmalloc.h>
+
+#include <asm/uaccess.h>
+#include <asm/pgalloc.h>
+
+#include <asm/io.h>
+#include <asm/page.h>	/* get_order */
+#include <asm/dma.h>    /* for DMA_CHUNK_SIZE */
+
+#include <linux/proc_fs.h>
+
+static struct proc_dir_entry * proc_gsc_root = NULL;
+static int pcxl_proc_info(char *buffer, char **start, off_t offset, int length);
+static unsigned long pcxl_used_bytes = 0;
+static unsigned long pcxl_used_pages = 0;
+
+extern unsigned long pcxl_dma_start; /* Start of pcxl dma mapping area */
+static spinlock_t   pcxl_res_lock;
+static char    *pcxl_res_map;
+static int     pcxl_res_hint;
+static int     pcxl_res_size;
+
+#ifdef DEBUG_PCXL_RESOURCE
+#define DBG_RES(x...)	printk(x)
+#else
+#define DBG_RES(x...)
+#endif
+
+
+/*
+** Dump a hex representation of the resource map.
+*/
+
+#ifdef DUMP_RESMAP
+static
+void dump_resmap(void)
+{
+	u_long *res_ptr = (unsigned long *)pcxl_res_map;
+	u_long i = 0;
+
+	printk("res_map: ");
+	for(; i < (pcxl_res_size / sizeof(unsigned long)); ++i, ++res_ptr)
+		printk("%08lx ", *res_ptr);
+
+	printk("\n");
+}
+#else
+static inline void dump_resmap(void) {;}
+#endif
+
+static int pa11_dma_supported( struct pci_dev *dev, dma_addr_t mask)
+{
+	return 1;
+}
+
+static inline int map_pte_uncached(pte_t * pte,
+		unsigned long vaddr,
+		unsigned long size, unsigned long *paddr_ptr)
+{
+	unsigned long end;
+	unsigned long orig_vaddr = vaddr;
+
+	vaddr &= ~PMD_MASK;
+	end = vaddr + size;
+	if (end > PMD_SIZE)
+		end = PMD_SIZE;
+	do {
+		if (!pte_none(*pte))
+			printk(KERN_ERR "map_pte_uncached: page already exists\n");
+		set_pte(pte, __mk_pte(*paddr_ptr, PAGE_KERNEL_UNC));
+		pdtlb_kernel(orig_vaddr);
+		vaddr += PAGE_SIZE;
+		orig_vaddr += PAGE_SIZE;
+		(*paddr_ptr) += PAGE_SIZE;
+		pte++;
+	} while (vaddr < end);
+	return 0;
+}
+
+static inline int map_pmd_uncached(pmd_t * pmd, unsigned long vaddr,
+		unsigned long size, unsigned long *paddr_ptr)
+{
+	unsigned long end;
+	unsigned long orig_vaddr = vaddr;
+
+	vaddr &= ~PGDIR_MASK;
+	end = vaddr + size;
+	if (end > PGDIR_SIZE)
+		end = PGDIR_SIZE;
+	do {
+		pte_t * pte = pte_alloc_kernel(pmd, vaddr);
+		if (!pte)
+			return -ENOMEM;
+		if (map_pte_uncached(pte, orig_vaddr, end - vaddr, paddr_ptr))
+			return -ENOMEM;
+		vaddr = (vaddr + PMD_SIZE) & PMD_MASK;
+		orig_vaddr += PMD_SIZE;
+		pmd++;
+	} while (vaddr < end);
+	return 0;
+}
+
+static inline int map_uncached_pages(unsigned long vaddr, unsigned long size,
+		unsigned long paddr)
+{
+	pgd_t * dir;
+	unsigned long end = vaddr + size;
+
+	dir = pgd_offset_k(vaddr);
+	do {
+		pmd_t *pmd;
+		
+		pmd = pmd_alloc_kernel(dir, vaddr);
+		if (!pmd)
+			return -ENOMEM;
+		if (map_pmd_uncached(pmd, vaddr, end - vaddr, &paddr))
+			return -ENOMEM;
+		vaddr = vaddr + PGDIR_SIZE;
+		dir++;
+	} while (vaddr && (vaddr < end));
+	return 0;
+}
+
+static inline void unmap_uncached_pte(pmd_t * pmd, unsigned long vaddr,
+		unsigned long size)
+{
+	pte_t * pte;
+	unsigned long end;
+	unsigned long orig_vaddr = vaddr;
+
+	if (pmd_none(*pmd))
+		return;
+	if (pmd_bad(*pmd)) {
+		pmd_ERROR(*pmd);
+		pmd_clear(pmd);
+		return;
+	}
+	pte = pte_offset(pmd, vaddr);
+	vaddr &= ~PMD_MASK;
+	end = vaddr + size;
+	if (end > PMD_SIZE)
+		end = PMD_SIZE;
+	do {
+		pte_t page = *pte;
+		pte_clear(pte);
+		pdtlb_kernel(orig_vaddr);
+		vaddr += PAGE_SIZE;
+		orig_vaddr += PAGE_SIZE;
+		pte++;
+		if (pte_none(page) || pte_present(page))
+			continue;
+		printk(KERN_CRIT "Whee.. Swapped out page in kernel page table\n");
+	} while (vaddr < end);
+}
+
+static inline void unmap_uncached_pmd(pgd_t * dir, unsigned long vaddr,
+		unsigned long size)
+{
+	pmd_t * pmd;
+	unsigned long end;
+	unsigned long orig_vaddr = vaddr;
+
+	if (pgd_none(*dir))
+		return;
+	if (pgd_bad(*dir)) {
+		pgd_ERROR(*dir);
+		pgd_clear(dir);
+		return;
+	}
+	pmd = pmd_offset(dir, vaddr);
+	vaddr &= ~PGDIR_MASK;
+	end = vaddr + size;
+	if (end > PGDIR_SIZE)
+		end = PGDIR_SIZE;
+	do {
+		unmap_uncached_pte(pmd, orig_vaddr, end - vaddr);
+		vaddr = (vaddr + PMD_SIZE) & PMD_MASK;
+		orig_vaddr += PMD_SIZE;
+		pmd++;
+	} while (vaddr < end);
+}
+
+static void unmap_uncached_pages(unsigned long vaddr, unsigned long size)
+{
+	pgd_t * dir;
+	unsigned long end = vaddr + size;
+
+	dir = pgd_offset_k(vaddr);
+	do {
+		unmap_uncached_pmd(dir, vaddr, end - vaddr);
+		vaddr = vaddr + PGDIR_SIZE;
+		dir++;
+	} while (vaddr && (vaddr < end));
+}
+
+#define PCXL_SEARCH_LOOP(idx, mask, size)  \
+       for(; res_ptr < res_end; ++res_ptr) \
+       { \
+               if(0 == ((*res_ptr) & mask)) { \
+                       *res_ptr |= mask; \
+		       idx = (int)((u_long)res_ptr - (u_long)pcxl_res_map); \
+		       pcxl_res_hint = idx + (size >> 3); \
+                       goto resource_found; \
+               } \
+       }
+
+#define PCXL_FIND_FREE_MAPPING(idx, mask, size)  { \
+       u##size *res_ptr = (u##size *)&(pcxl_res_map[pcxl_res_hint & ~((size >> 3) - 1)]); \
+       u##size *res_end = (u##size *)&pcxl_res_map[pcxl_res_size]; \
+       PCXL_SEARCH_LOOP(idx, mask, size); \
+       res_ptr = (u##size *)&pcxl_res_map[0]; \
+       PCXL_SEARCH_LOOP(idx, mask, size); \
+}
+
+unsigned long
+pcxl_alloc_range(size_t size)
+{
+	int res_idx;
+	u_long mask, flags;
+	unsigned int pages_needed = size >> PAGE_SHIFT;
+
+	ASSERT(pages_needed);
+	ASSERT((pages_needed * PAGE_SIZE) < DMA_CHUNK_SIZE);
+	ASSERT(pages_needed < (BITS_PER_LONG - PAGE_SHIFT));
+
+	mask = (u_long) -1L;
+ 	mask >>= BITS_PER_LONG - pages_needed;
+
+	DBG_RES("pcxl_alloc_range() size: %d pages_needed %d pages_mask 0x%08lx\n", 
+		size, pages_needed, mask);
+
+	spin_lock_irqsave(&pcxl_res_lock, flags);
+
+	if(pages_needed <= 8) {
+		PCXL_FIND_FREE_MAPPING(res_idx, mask, 8);
+	} else if(pages_needed <= 16) {
+		PCXL_FIND_FREE_MAPPING(res_idx, mask, 16);
+	} else if(pages_needed <= 32) {
+		PCXL_FIND_FREE_MAPPING(res_idx, mask, 32);
+	} else {
+		panic(__FILE__ ": pcxl_alloc_range() Too many pages to map.\n");
+	}
+
+	dump_resmap();
+	panic(__FILE__ ": pcxl_alloc_range() out of dma mapping resources\n");
+	
+resource_found:
+	
+	DBG_RES("pcxl_alloc_range() res_idx %d mask 0x%08lx res_hint: %d\n",
+		res_idx, mask, pcxl_res_hint);
+
+	pcxl_used_pages += pages_needed;
+	pcxl_used_bytes += ((pages_needed >> 3) ? (pages_needed >> 3) : 1);
+
+	spin_unlock_irqrestore(&pcxl_res_lock, flags);
+
+	dump_resmap();
+
+	/* 
+	** return the corresponding vaddr in the pcxl dma map
+	*/
+	return (pcxl_dma_start + (res_idx << (PAGE_SHIFT + 3)));
+}
+
+#define PCXL_FREE_MAPPINGS(idx, m, size) \
+		u##size *res_ptr = (u##size *)&(pcxl_res_map[(idx) + (((size >> 3) - 1) & (~((size >> 3) - 1)))]); \
+		ASSERT((*res_ptr & m) == m); \
+		*res_ptr &= ~m;
+
+/*
+** clear bits in the pcxl resource map
+*/
+static void
+pcxl_free_range(unsigned long vaddr, size_t size)
+{
+	u_long mask, flags;
+	unsigned int res_idx = (vaddr - pcxl_dma_start) >> (PAGE_SHIFT + 3);
+	unsigned int pages_mapped = size >> PAGE_SHIFT;
+
+	ASSERT(pages_mapped);
+	ASSERT((pages_mapped * PAGE_SIZE) < DMA_CHUNK_SIZE);
+	ASSERT(pages_mapped < (BITS_PER_LONG - PAGE_SHIFT));
+
+	mask = (u_long) -1L;
+ 	mask >>= BITS_PER_LONG - pages_mapped;
+
+	DBG_RES("pcxl_free_range() res_idx: %d size: %d pages_mapped %d mask 0x%08lx\n", 
+		res_idx, size, pages_mapped, mask);
+
+	spin_lock_irqsave(&pcxl_res_lock, flags);
+
+	if(pages_mapped <= 8) {
+		PCXL_FREE_MAPPINGS(res_idx, mask, 8);
+	} else if(pages_mapped <= 16) {
+		PCXL_FREE_MAPPINGS(res_idx, mask, 16);
+	} else if(pages_mapped <= 32) {
+		PCXL_FREE_MAPPINGS(res_idx, mask, 32);
+	} else {
+		panic(__FILE__ ": pcxl_free_range() Too many pages to unmap.\n");
+	}
+	
+	pcxl_used_pages -= (pages_mapped ? pages_mapped : 1);
+	pcxl_used_bytes -= ((pages_mapped >> 3) ? (pages_mapped >> 3) : 1);
+
+	spin_unlock_irqrestore(&pcxl_res_lock, flags);
+
+	dump_resmap();
+}
+
+static int __init
+pcxl_dma_init(void)
+{
+    if (pcxl_dma_start == 0)
+	return 0;
+
+    spin_lock_init(&pcxl_res_lock);
+    pcxl_res_size = PCXL_DMA_MAP_SIZE >> (PAGE_SHIFT + 3);
+    pcxl_res_hint = 0;
+    pcxl_res_map = (char *)__get_free_pages(GFP_KERNEL,
+					    get_order(pcxl_res_size));
+
+    proc_gsc_root = proc_mkdir("gsc", 0);
+    create_proc_info_entry("dino", 0, proc_gsc_root, pcxl_proc_info);
+    return 0;
+}
+
+__initcall(pcxl_dma_init);
+
+static void * pa11_dma_alloc_consistent (struct pci_dev *hwdev, size_t size, dma_addr_t *dma_handle)
+{
+	unsigned long vaddr;
+	unsigned long paddr;
+	int order;
+
+	order = get_order(size);
+	size = 1 << (order + PAGE_SHIFT);
+	vaddr = pcxl_alloc_range(size);
+	paddr = __get_free_pages(GFP_ATOMIC, order);
+	flush_kernel_dcache_range(paddr, size);
+	paddr = __pa(paddr);
+	map_uncached_pages(vaddr, size, paddr);
+	*dma_handle = (dma_addr_t) paddr;
+
+#if 0
+/* This probably isn't needed to support EISA cards.
+** ISA cards will certainly only support 24-bit DMA addressing.
+** Not clear if we can, want, or need to support ISA.
+*/
+	if (!hwdev || hwdev->dma_mask != 0xffffffff)
+		gfp |= GFP_DMA;
+#endif
+	return (void *)vaddr;
+}
+
+static void pa11_dma_free_consistent (struct pci_dev *hwdev, size_t size, void *vaddr, dma_addr_t dma_handle)
+{
+	int order;
+
+	order = get_order(size);
+	size = 1 << (order + PAGE_SHIFT);
+	unmap_uncached_pages((unsigned long)vaddr, size);
+	pcxl_free_range((unsigned long)vaddr, size);
+	free_pages((unsigned long)__va(dma_handle), order);
+}
+
+static dma_addr_t pa11_dma_map_single(struct pci_dev *dev, void *addr, size_t size, int direction)
+{
+	if (direction == PCI_DMA_NONE) {
+		printk(KERN_ERR "pa11_dma_map_single(PCI_DMA_NONE) called by %p\n", __builtin_return_address(0));
+		BUG();
+	}
+
+	flush_kernel_dcache_range((unsigned long) addr, size);
+	return virt_to_phys(addr);
+}
+
+static void pa11_dma_unmap_single(struct pci_dev *dev, dma_addr_t dma_handle, size_t size, int direction)
+{
+	if (direction == PCI_DMA_NONE) {
+		printk(KERN_ERR "pa11_dma_unmap_single(PCI_DMA_NONE) called by %p\n", __builtin_return_address(0));
+		BUG();
+	}
+
+	if (direction == PCI_DMA_TODEVICE)
+	    return;
+
+	/*
+	 * For PCI_DMA_FROMDEVICE this flush is not necessary for the
+	 * simple map/unmap case. However, it IS necessary if if
+	 * pci_dma_sync_single has been called and the buffer reused.
+	 */
+
+	flush_kernel_dcache_range((unsigned long) phys_to_virt(dma_handle), size);
+	return;
+}
+
+static int pa11_dma_map_sg(struct pci_dev *dev, struct scatterlist *sglist, int nents, int direction)
+{
+	int i;
+
+	if (direction == PCI_DMA_NONE)
+	    BUG();
+
+	for (i = 0; i < nents; i++, sglist++ ) {
+		sg_dma_address(sglist) = (dma_addr_t) virt_to_phys(sglist->address);
+		sg_dma_len(sglist) = sglist->length;
+		flush_kernel_dcache_range((unsigned long)sglist->address,
+				sglist->length);
+	}
+	return nents;
+}
+
+static void pa11_dma_unmap_sg(struct pci_dev *dev, struct scatterlist *sglist, int nents, int direction)
+{
+	int i;
+
+	if (direction == PCI_DMA_NONE)
+	    BUG();
+
+	if (direction == PCI_DMA_TODEVICE)
+	    return;
+
+	/* once we do combining we'll need to use phys_to_virt(sg_dma_address(sglist)) */
+
+	for (i = 0; i < nents; i++, sglist++ )
+		flush_kernel_dcache_range((unsigned long) sglist->address, sglist->length);
+	return;
+}
+
+static void pa11_dma_sync_single(struct pci_dev *dev, dma_addr_t dma_handle, size_t size, int direction)
+{
+	if (direction == PCI_DMA_NONE)
+	    BUG();
+
+	flush_kernel_dcache_range((unsigned long) phys_to_virt(dma_handle), size);
+}
+
+static void pa11_dma_sync_sg(struct pci_dev *dev, struct scatterlist *sglist, int nents, int direction)
+{
+	int i;
+
+	/* once we do combining we'll need to use phys_to_virt(sg_dma_address(sglist)) */
+
+	for (i = 0; i < nents; i++, sglist++ )
+		flush_kernel_dcache_range((unsigned long) sglist->address, sglist->length);
+}
+
+struct pci_dma_ops pcxl_dma_ops = {
+	pa11_dma_supported,			/* dma_support */
+	pa11_dma_alloc_consistent,
+	pa11_dma_free_consistent,
+	pa11_dma_map_single,			/* map_single */
+	pa11_dma_unmap_single,			/* unmap_single */
+	pa11_dma_map_sg,			/* map_sg */
+	pa11_dma_unmap_sg,			/* unmap_sg */
+	pa11_dma_sync_single,			/* dma_sync_single */
+	pa11_dma_sync_sg			/* dma_sync_sg */
+};
+
+static void *fail_alloc_consistent(struct pci_dev *hwdev, size_t size,
+		dma_addr_t *dma_handle)
+{
+	return NULL;
+}
+
+static void fail_free_consistent(struct pci_dev *dev, size_t size,
+		void *vaddr, dma_addr_t iova)
+{
+	return;
+}
+
+struct pci_dma_ops pcx_dma_ops = {
+	pa11_dma_supported,			/* dma_support */
+	fail_alloc_consistent,
+	fail_free_consistent,
+	pa11_dma_map_single,			/* map_single */
+	pa11_dma_unmap_single,			/* unmap_single */
+	pa11_dma_map_sg,			/* map_sg */
+	pa11_dma_unmap_sg,			/* unmap_sg */
+	pa11_dma_sync_single,			/* dma_sync_single */
+	pa11_dma_sync_sg			/* dma_sync_sg */
+};
+
+struct pci_dma_ops *hppa_dma_ops;
+
+static int pcxl_proc_info(char *buf, char **start, off_t offset, int len)
+{
+	u_long i = 0;
+	unsigned long *res_ptr = (u_long *)pcxl_res_map;
+	unsigned long total_pages = pcxl_res_size << 3;        /* 8 bits per byte */
+
+	sprintf(buf, "\nDMA Mapping Area size    : %d bytes (%d pages)\n",
+		PCXL_DMA_MAP_SIZE,
+		(pcxl_res_size << 3) ); /* 1 bit per page */
+	
+	sprintf(buf, "%sResource bitmap : %d bytes (%d pages)\n", 
+		buf, pcxl_res_size, pcxl_res_size << 3);   /* 8 bits per byte */
+
+	strcat(buf,  "     	  total:    free:    used:   % used:\n");
+	sprintf(buf, "%sblocks  %8d %8ld %8ld %8ld%%\n", buf, pcxl_res_size,
+		pcxl_res_size - pcxl_used_bytes, pcxl_used_bytes,
+		(pcxl_used_bytes * 100) / pcxl_res_size);
+
+	sprintf(buf, "%spages   %8ld %8ld %8ld %8ld%%\n", buf, total_pages,
+		total_pages - pcxl_used_pages, pcxl_used_pages,
+		(pcxl_used_pages * 100 / total_pages));
+	
+	strcat(buf, "\nResource bitmap:");
+
+	for(; i < (pcxl_res_size / sizeof(u_long)); ++i, ++res_ptr) {
+		if ((i & 7) == 0)
+		    strcat(buf,"\n   ");
+		sprintf(buf, "%s %08lx", buf, *res_ptr);
+	}
+	strcat(buf, "\n");
+	return strlen(buf);
+}
+