drm/pcigart: fix the pci gart to use the drm_pci wrapper.

This is the correct fix for the RS690 and hopefully the dma coherent work.

For now we limit everybody to a 32-bit DMA mask but it is possible for
RS690 to use a 40-bit DMA mask for the GART table itself,
and the PCIE cards can use 40-bits for the table entries.

Signed-off-by: Dave Airlie <airlied@redhat.com>

4 files changed, 28 insertions, 82 deletions

diff --git a/linux-core/ati_pcigart.c b/linux-core/ati_pcigart.c
index 74f91bc4..beaa4424 100644
--- a/linux-core/ati_pcigart.c
+++ b/linux-core/ati_pcigart.c
@@ -34,51 +34,23 @@
 #include "drmP.h"
 
 # define ATI_PCIGART_PAGE_SIZE		4096	/**< PCI GART page size */
-
-static void *drm_ati_alloc_pcigart_table(int order)
+static int drm_ati_alloc_pcigart_table(struct drm_device *dev,
+				       struct drm_ati_pcigart_info *gart_info)
 {
-	unsigned long address;
-	struct page *page;
-	int i;
+	gart_info->table_handle = drm_pci_alloc(dev, gart_info->table_size,
+						PAGE_SIZE,
+						gart_info->table_mask);
+	if (gart_info->table_handle == NULL)
+		return -ENOMEM;
 
-	DRM_DEBUG("%d order\n", order);
-
-	address = __get_free_pages(GFP_KERNEL | __GFP_COMP | __GFP_DMA32,
-				   order);
-	if (address == 0UL) {
-		return NULL;
-	}
-
-	page = virt_to_page(address);
-
-	for (i = 0; i < order; i++, page++) {
-#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,15)
-		get_page(page);
-#endif
-		SetPageReserved(page);
-	}
-
-	DRM_DEBUG("returning 0x%08lx\n", address);
-	return (void *)address;
+	return 0;
 }
 
-static void drm_ati_free_pcigart_table(void *address, int order)
+static void drm_ati_free_pcigart_table(struct drm_device *dev,
+				       struct drm_ati_pcigart_info *gart_info)
 {
-	struct page *page;
-	int i;
-	int num_pages = 1 << order;
-	DRM_DEBUG("\n");
-
-	page = virt_to_page((unsigned long)address);
-
-	for (i = 0; i < num_pages; i++, page++) {
-#if LINUX_VERSION_CODE < KERNEL_VERSION(2,6,15)
-		__put_page(page);
-#endif
-		ClearPageReserved(page);
-	}
-
-	free_pages((unsigned long)address, order);
+	drm_pci_free(dev, gart_info->table_handle);
+	gart_info->table_handle = NULL;
 }
 
 int drm_ati_pcigart_cleanup(struct drm_device *dev, struct drm_ati_pcigart_info *gart_info)
@@ -86,8 +58,7 @@ int drm_ati_pcigart_cleanup(struct drm_device *dev, struct drm_ati_pcigart_info
 	struct drm_sg_mem *entry = dev->sg;
 	unsigned long pages;
 	int i;
-	int order;
-	int num_pages, max_pages;
+	int max_pages;
 
 	/* we need to support large memory configurations */
 	if (!entry) {
@@ -95,15 +66,7 @@ int drm_ati_pcigart_cleanup(struct drm_device *dev, struct drm_ati_pcigart_info
 		return 0;
 	}
 
-	order = drm_order((gart_info->table_size + (PAGE_SIZE-1)) / PAGE_SIZE);
-	num_pages = 1 << order;
-
 	if (gart_info->bus_addr) {
-		if (gart_info->gart_table_location == DRM_ATI_GART_MAIN) {
-			pci_unmap_single(dev->pdev, gart_info->bus_addr,
-					 num_pages * PAGE_SIZE,
-					 PCI_DMA_TODEVICE);
-		}
 
 		max_pages = (gart_info->table_size / sizeof(u32));
 		pages = (entry->pages <= max_pages)
@@ -122,10 +85,9 @@ int drm_ati_pcigart_cleanup(struct drm_device *dev, struct drm_ati_pcigart_info
 
 
 	if (gart_info->gart_table_location == DRM_ATI_GART_MAIN
-	    && gart_info->addr) {
+	    && gart_info->table_handle) {
 
-		drm_ati_free_pcigart_table(gart_info->addr, order);
-		gart_info->addr = NULL;
+		drm_ati_free_pcigart_table(dev, gart_info);
 	}
 
 	return 1;
@@ -140,9 +102,7 @@ int drm_ati_pcigart_init(struct drm_device *dev, struct drm_ati_pcigart_info *ga
 	u32 *pci_gart, page_base;
 	dma_addr_t bus_address = 0;
 	int i, j, ret = 0;
-	int order;
 	int max_pages;
-	int num_pages;
 
 	if (!entry) {
 		DRM_ERROR("no scatter/gather memory!\n");
@@ -152,31 +112,14 @@ int drm_ati_pcigart_init(struct drm_device *dev, struct drm_ati_pcigart_info *ga
 	if (gart_info->gart_table_location == DRM_ATI_GART_MAIN) {
 		DRM_DEBUG("PCI: no table in VRAM: using normal RAM\n");
 
-		order = drm_order((gart_info->table_size +
-				   (PAGE_SIZE-1)) / PAGE_SIZE);
-		num_pages = 1 << order;
-		address = drm_ati_alloc_pcigart_table(order);
-		if (!address) {
+		ret = drm_ati_alloc_pcigart_table(dev, gart_info);
+		if (ret) {
 			DRM_ERROR("cannot allocate PCI GART page!\n");
 			goto done;
 		}
 
-		if (!dev->pdev) {
-			DRM_ERROR("PCI device unknown!\n");
-			goto done;
-		}
-
-		bus_address = pci_map_single(dev->pdev, address,
-					     num_pages * PAGE_SIZE,
-					     PCI_DMA_TODEVICE);
-		if (bus_address == 0) {
-			DRM_ERROR("unable to map PCIGART pages!\n");
-			order = drm_order((gart_info->table_size +
-					   (PAGE_SIZE-1)) / PAGE_SIZE);
-			drm_ati_free_pcigart_table(address, order);
-			address = NULL;
-			goto done;
-		}
+		address = gart_info->table_handle->vaddr;
+		bus_address = gart_info->table_handle->busaddr;
 	} else {
 		address = gart_info->addr;
 		bus_address = gart_info->bus_addr;
@@ -225,12 +168,6 @@ int drm_ati_pcigart_init(struct drm_device *dev, struct drm_ati_pcigart_info *ga
 		}
 	}
 
-	if (gart_info->gart_table_location == DRM_ATI_GART_MAIN)
-		dma_sync_single_for_device(&dev->pdev->dev,
-					   bus_address,
-					   max_pages * sizeof(u32),
-					   PCI_DMA_TODEVICE);
-
 	ret = 1;
 
 #if defined(__i386__) || defined(__x86_64__)
diff --git a/linux-core/drmP.h b/linux-core/drmP.h
index 2f76f3df..69d31e14 100644
--- a/linux-core/drmP.h
+++ b/linux-core/drmP.h
@@ -52,6 +52,7 @@
 #include <linux/version.h>
 #include <linux/sched.h>
 #include <linux/smp_lock.h>	/* For (un)lock_kernel */
+#include <linux/dma-mapping.h>
 #include <linux/mm.h>
 #include <linux/pagemap.h>
 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,16)
@@ -596,6 +597,9 @@ struct drm_ati_pcigart_info {
 	int gart_reg_if;
 	void *addr;
 	dma_addr_t bus_addr;
+	dma_addr_t table_mask;
+	dma_addr_t member_mask;
+	struct drm_dma_handle *table_handle;
 	drm_local_map_t mapping;
 	int table_size;
 };
diff --git a/linux-core/drm_compat.h b/linux-core/drm_compat.h
index 0613b5d2..3b1287e1 100644
--- a/linux-core/drm_compat.h
+++ b/linux-core/drm_compat.h
@@ -339,4 +339,8 @@ extern void *kmap_atomic_prot_pfn(unsigned long pfn, enum km_type type,
 #define flush_agp_mappings() do {} while(0)
 #endif
 
+#ifndef DMA_BIT_MASK
+#define DMA_BIT_MASK(n) (((n) == 64) ? ~0ULL : (1ULL<<(n)) - 1)
+#endif
+
 #endif
diff --git a/linux-core/xgi_pcie.c b/linux-core/xgi_pcie.c
index a7d3ea24..614616a9 100644
--- a/linux-core/xgi_pcie.c
+++ b/linux-core/xgi_pcie.c
@@ -86,6 +86,7 @@ int xgi_pcie_heap_init(struct xgi_info * info)
 		return err;
 	}
 
+	info->gart_info.table_mask = DMA_BIT_MASK(32);
 	info->gart_info.gart_table_location = DRM_ATI_GART_MAIN;
 	info->gart_info.gart_reg_if = DRM_ATI_GART_PCI;
 	info->gart_info.table_size = info->dev->sg->pages * sizeof(u32);