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-rw-r--r--arch/powerpc/Kconfig13
-rw-r--r--arch/powerpc/include/asm/dma-mapping.h6
-rw-r--r--arch/powerpc/include/asm/pgtable-ppc32.h4
-rw-r--r--arch/powerpc/kernel/dma.c2
-rw-r--r--arch/powerpc/mm/dma-noncoherent.c108
-rw-r--r--arch/powerpc/mm/mem.c4
6 files changed, 54 insertions, 83 deletions
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 3bb43adce44..cdc9a6ff4be 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -868,19 +868,6 @@ config TASK_SIZE
default "0x80000000" if PPC_PREP || PPC_8xx
default "0xc0000000"
-config CONSISTENT_START_BOOL
- bool "Set custom consistent memory pool address"
- depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
- help
- This option allows you to set the base virtual address
- of the consistent memory pool. This pool of virtual
- memory is used to make consistent memory allocations.
-
-config CONSISTENT_START
- hex "Base virtual address of consistent memory pool" if CONSISTENT_START_BOOL
- default "0xfd000000" if (NOT_COHERENT_CACHE && 8xx)
- default "0xff100000" if NOT_COHERENT_CACHE
-
config CONSISTENT_SIZE_BOOL
bool "Set custom consistent memory pool size"
depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
diff --git a/arch/powerpc/include/asm/dma-mapping.h b/arch/powerpc/include/asm/dma-mapping.h
index c69f2b5f0cc..cb448d68452 100644
--- a/arch/powerpc/include/asm/dma-mapping.h
+++ b/arch/powerpc/include/asm/dma-mapping.h
@@ -26,7 +26,9 @@
* allocate the space "normally" and use the cache management functions
* to ensure it is consistent.
*/
-extern void *__dma_alloc_coherent(size_t size, dma_addr_t *handle, gfp_t gfp);
+struct device;
+extern void *__dma_alloc_coherent(struct device *dev, size_t size,
+ dma_addr_t *handle, gfp_t gfp);
extern void __dma_free_coherent(size_t size, void *vaddr);
extern void __dma_sync(void *vaddr, size_t size, int direction);
extern void __dma_sync_page(struct page *page, unsigned long offset,
@@ -37,7 +39,7 @@ extern void __dma_sync_page(struct page *page, unsigned long offset,
* Cache coherent cores.
*/
-#define __dma_alloc_coherent(gfp, size, handle) NULL
+#define __dma_alloc_coherent(dev, gfp, size, handle) NULL
#define __dma_free_coherent(size, addr) ((void)0)
#define __dma_sync(addr, size, rw) ((void)0)
#define __dma_sync_page(pg, off, sz, rw) ((void)0)
diff --git a/arch/powerpc/include/asm/pgtable-ppc32.h b/arch/powerpc/include/asm/pgtable-ppc32.h
index 28fe9d4bae3..c9ff9d75990 100644
--- a/arch/powerpc/include/asm/pgtable-ppc32.h
+++ b/arch/powerpc/include/asm/pgtable-ppc32.h
@@ -71,7 +71,11 @@ extern int icache_44x_need_flush;
* until mem_init() at which point this becomes the top of the vmalloc
* and ioremap space
*/
+#ifdef CONFIG_NOT_COHERENT_CACHE
+#define IOREMAP_TOP ((KVIRT_TOP - CONFIG_CONSISTENT_SIZE) & PAGE_MASK)
+#else
#define IOREMAP_TOP KVIRT_TOP
+#endif
/*
* Just any arbitrary offset to the start of the vmalloc VM area: the
diff --git a/arch/powerpc/kernel/dma.c b/arch/powerpc/kernel/dma.c
index 53c7788cba7..6b02793dc75 100644
--- a/arch/powerpc/kernel/dma.c
+++ b/arch/powerpc/kernel/dma.c
@@ -32,7 +32,7 @@ void *dma_direct_alloc_coherent(struct device *dev, size_t size,
{
void *ret;
#ifdef CONFIG_NOT_COHERENT_CACHE
- ret = __dma_alloc_coherent(size, dma_handle, flag);
+ ret = __dma_alloc_coherent(dev, size, dma_handle, flag);
if (ret == NULL)
return NULL;
*dma_handle += get_dma_direct_offset(dev);
diff --git a/arch/powerpc/mm/dma-noncoherent.c b/arch/powerpc/mm/dma-noncoherent.c
index b7dc4c19f58..36692f5c9a7 100644
--- a/arch/powerpc/mm/dma-noncoherent.c
+++ b/arch/powerpc/mm/dma-noncoherent.c
@@ -32,20 +32,21 @@
#include <asm/tlbflush.h>
+#include "mmu_decl.h"
+
/*
* This address range defaults to a value that is safe for all
* platforms which currently set CONFIG_NOT_COHERENT_CACHE. It
* can be further configured for specific applications under
* the "Advanced Setup" menu. -Matt
*/
-#define CONSISTENT_BASE (CONFIG_CONSISTENT_START)
-#define CONSISTENT_END (CONFIG_CONSISTENT_START + CONFIG_CONSISTENT_SIZE)
+#define CONSISTENT_BASE (IOREMAP_TOP)
+#define CONSISTENT_END (CONSISTENT_BASE + CONFIG_CONSISTENT_SIZE)
#define CONSISTENT_OFFSET(x) (((unsigned long)(x) - CONSISTENT_BASE) >> PAGE_SHIFT)
/*
* This is the page table (2MB) covering uncached, DMA consistent allocations
*/
-static pte_t *consistent_pte;
static DEFINE_SPINLOCK(consistent_lock);
/*
@@ -148,22 +149,38 @@ static struct ppc_vm_region *ppc_vm_region_find(struct ppc_vm_region *head, unsi
* virtual and bus address for that space.
*/
void *
-__dma_alloc_coherent(size_t size, dma_addr_t *handle, gfp_t gfp)
+__dma_alloc_coherent(struct device *dev, size_t size, dma_addr_t *handle, gfp_t gfp)
{
struct page *page;
struct ppc_vm_region *c;
unsigned long order;
- u64 mask = 0x00ffffff, limit; /* ISA default */
+ u64 mask = ISA_DMA_THRESHOLD, limit;
- if (!consistent_pte) {
- printk(KERN_ERR "%s: not initialised\n", __func__);
- dump_stack();
- return NULL;
+ if (dev) {
+ mask = dev->coherent_dma_mask;
+
+ /*
+ * Sanity check the DMA mask - it must be non-zero, and
+ * must be able to be satisfied by a DMA allocation.
+ */
+ if (mask == 0) {
+ dev_warn(dev, "coherent DMA mask is unset\n");
+ goto no_page;
+ }
+
+ if ((~mask) & ISA_DMA_THRESHOLD) {
+ dev_warn(dev, "coherent DMA mask %#llx is smaller "
+ "than system GFP_DMA mask %#llx\n",
+ mask, (unsigned long long)ISA_DMA_THRESHOLD);
+ goto no_page;
+ }
}
+
size = PAGE_ALIGN(size);
limit = (mask + 1) & ~mask;
- if ((limit && size >= limit) || size >= (CONSISTENT_END - CONSISTENT_BASE)) {
+ if ((limit && size >= limit) ||
+ size >= (CONSISTENT_END - CONSISTENT_BASE)) {
printk(KERN_WARNING "coherent allocation too big (requested %#x mask %#Lx)\n",
size, mask);
return NULL;
@@ -171,6 +188,7 @@ __dma_alloc_coherent(size_t size, dma_addr_t *handle, gfp_t gfp)
order = get_order(size);
+ /* Might be useful if we ever have a real legacy DMA zone... */
if (mask != 0xffffffff)
gfp |= GFP_DMA;
@@ -195,7 +213,6 @@ __dma_alloc_coherent(size_t size, dma_addr_t *handle, gfp_t gfp)
gfp & ~(__GFP_DMA | __GFP_HIGHMEM));
if (c) {
unsigned long vaddr = c->vm_start;
- pte_t *pte = consistent_pte + CONSISTENT_OFFSET(vaddr);
struct page *end = page + (1 << order);
split_page(page, order);
@@ -206,13 +223,10 @@ __dma_alloc_coherent(size_t size, dma_addr_t *handle, gfp_t gfp)
*handle = page_to_phys(page);
do {
- BUG_ON(!pte_none(*pte));
-
SetPageReserved(page);
- set_pte_at(&init_mm, vaddr,
- pte, mk_pte(page, pgprot_noncached(PAGE_KERNEL)));
+ map_page(vaddr, page_to_phys(page),
+ pgprot_noncached(PAGE_KERNEL));
page++;
- pte++;
vaddr += PAGE_SIZE;
} while (size -= PAGE_SIZE);
@@ -241,8 +255,7 @@ void __dma_free_coherent(size_t size, void *vaddr)
{
struct ppc_vm_region *c;
unsigned long flags, addr;
- pte_t *ptep;
-
+
size = PAGE_ALIGN(size);
spin_lock_irqsave(&consistent_lock, flags);
@@ -258,29 +271,26 @@ void __dma_free_coherent(size_t size, void *vaddr)
size = c->vm_end - c->vm_start;
}
- ptep = consistent_pte + CONSISTENT_OFFSET(c->vm_start);
addr = c->vm_start;
do {
- pte_t pte = ptep_get_and_clear(&init_mm, addr, ptep);
+ pte_t *ptep;
unsigned long pfn;
- ptep++;
- addr += PAGE_SIZE;
-
- if (!pte_none(pte) && pte_present(pte)) {
- pfn = pte_pfn(pte);
-
+ ptep = pte_offset_kernel(pmd_offset(pud_offset(pgd_offset_k(addr),
+ addr),
+ addr),
+ addr);
+ if (!pte_none(*ptep) && pte_present(*ptep)) {
+ pfn = pte_pfn(*ptep);
+ pte_clear(&init_mm, addr, ptep);
if (pfn_valid(pfn)) {
struct page *page = pfn_to_page(pfn);
- ClearPageReserved(page);
+ ClearPageReserved(page);
__free_page(page);
- continue;
}
}
-
- printk(KERN_CRIT "%s: bad page in kernel page table\n",
- __func__);
+ addr += PAGE_SIZE;
} while (size -= PAGE_SIZE);
flush_tlb_kernel_range(c->vm_start, c->vm_end);
@@ -301,42 +311,6 @@ void __dma_free_coherent(size_t size, void *vaddr)
EXPORT_SYMBOL(__dma_free_coherent);
/*
- * Initialise the consistent memory allocation.
- */
-static int __init dma_alloc_init(void)
-{
- pgd_t *pgd;
- pud_t *pud;
- pmd_t *pmd;
- pte_t *pte;
- int ret = 0;
-
- do {
- pgd = pgd_offset(&init_mm, CONSISTENT_BASE);
- pud = pud_alloc(&init_mm, pgd, CONSISTENT_BASE);
- pmd = pmd_alloc(&init_mm, pud, CONSISTENT_BASE);
- if (!pmd) {
- printk(KERN_ERR "%s: no pmd tables\n", __func__);
- ret = -ENOMEM;
- break;
- }
-
- pte = pte_alloc_kernel(pmd, CONSISTENT_BASE);
- if (!pte) {
- printk(KERN_ERR "%s: no pte tables\n", __func__);
- ret = -ENOMEM;
- break;
- }
-
- consistent_pte = pte;
- } while (0);
-
- return ret;
-}
-
-core_initcall(dma_alloc_init);
-
-/*
* make an area consistent.
*/
void __dma_sync(void *vaddr, size_t size, int direction)
diff --git a/arch/powerpc/mm/mem.c b/arch/powerpc/mm/mem.c
index d3a4e67561f..579382c163a 100644
--- a/arch/powerpc/mm/mem.c
+++ b/arch/powerpc/mm/mem.c
@@ -387,6 +387,10 @@ void __init mem_init(void)
pr_info(" * 0x%08lx..0x%08lx : highmem PTEs\n",
PKMAP_BASE, PKMAP_ADDR(LAST_PKMAP));
#endif /* CONFIG_HIGHMEM */
+#ifdef CONFIG_NOT_COHERENT_CACHE
+ pr_info(" * 0x%08lx..0x%08lx : consistent mem\n",
+ IOREMAP_TOP, IOREMAP_TOP + CONFIG_CONSISTENT_SIZE);
+#endif /* CONFIG_NOT_COHERENT_CACHE */
pr_info(" * 0x%08lx..0x%08lx : early ioremap\n",
ioremap_bot, IOREMAP_TOP);
pr_info(" * 0x%08lx..0x%08lx : vmalloc & ioremap\n",
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-12 22:20:02 +0000