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-rw-r--r--drivers/char/agp/intel-agp.c174
1 files changed, 162 insertions, 12 deletions
diff --git a/drivers/char/agp/intel-agp.c b/drivers/char/agp/intel-agp.c
index 21983456d672..20fe82b99fdb 100644
--- a/drivers/char/agp/intel-agp.c
+++ b/drivers/char/agp/intel-agp.c
@@ -10,6 +10,16 @@
#include <linux/agp_backend.h>
#include "agp.h"
+/*
+ * If we have Intel graphics, we're not going to have anything other than
+ * an Intel IOMMU. So make the correct use of the PCI DMA API contingent
+ * on the Intel IOMMU support (CONFIG_DMAR).
+ * Only newer chipsets need to bother with this, of course.
+ */
+#ifdef CONFIG_DMAR
+#define USE_PCI_DMA_API 1
+#endif
+
#define PCI_DEVICE_ID_INTEL_E7221_HB 0x2588
#define PCI_DEVICE_ID_INTEL_E7221_IG 0x258a
#define PCI_DEVICE_ID_INTEL_82946GZ_HB 0x2970
@@ -170,6 +180,131 @@ static struct _intel_private {
int resource_valid;
} intel_private;
+#ifdef USE_PCI_DMA_API
+static int intel_agp_map_page(void *addr, dma_addr_t *ret)
+{
+ *ret = pci_map_single(intel_private.pcidev, addr,
+ PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
+ if (pci_dma_mapping_error(intel_private.pcidev, *ret))
+ return -EINVAL;
+ return 0;
+}
+
+static void intel_agp_unmap_page(void *addr, dma_addr_t dma)
+{
+ pci_unmap_single(intel_private.pcidev, dma,
+ PAGE_SIZE, PCI_DMA_BIDIRECTIONAL);
+}
+
+static int intel_agp_map_memory(struct agp_memory *mem)
+{
+ struct scatterlist *sg;
+ int i;
+
+ DBG("try mapping %lu pages\n", (unsigned long)mem->page_count);
+
+ if ((mem->page_count * sizeof(*mem->sg_list)) < 2*PAGE_SIZE)
+ mem->sg_list = kcalloc(mem->page_count, sizeof(*mem->sg_list),
+ GFP_KERNEL);
+
+ if (mem->sg_list == NULL) {
+ mem->sg_list = vmalloc(mem->page_count * sizeof(*mem->sg_list));
+ mem->sg_vmalloc_flag = 1;
+ }
+
+ if (!mem->sg_list) {
+ mem->sg_vmalloc_flag = 0;
+ return -ENOMEM;
+ }
+ sg_init_table(mem->sg_list, mem->page_count);
+
+ sg = mem->sg_list;
+ for (i = 0 ; i < mem->page_count; i++, sg = sg_next(sg))
+ sg_set_page(sg, mem->pages[i], PAGE_SIZE, 0);
+
+ mem->num_sg = pci_map_sg(intel_private.pcidev, mem->sg_list,
+ mem->page_count, PCI_DMA_BIDIRECTIONAL);
+ if (!mem->num_sg) {
+ if (mem->sg_vmalloc_flag)
+ vfree(mem->sg_list);
+ else
+ kfree(mem->sg_list);
+ mem->sg_list = NULL;
+ mem->sg_vmalloc_flag = 0;
+ return -ENOMEM;
+ }
+ return 0;
+}
+
+static void intel_agp_unmap_memory(struct agp_memory *mem)
+{
+ DBG("try unmapping %lu pages\n", (unsigned long)mem->page_count);
+
+ pci_unmap_sg(intel_private.pcidev, mem->sg_list,
+ mem->page_count, PCI_DMA_BIDIRECTIONAL);
+ if (mem->sg_vmalloc_flag)
+ vfree(mem->sg_list);
+ else
+ kfree(mem->sg_list);
+ mem->sg_vmalloc_flag = 0;
+ mem->sg_list = NULL;
+ mem->num_sg = 0;
+}
+
+static void intel_agp_insert_sg_entries(struct agp_memory *mem,
+ off_t pg_start, int mask_type)
+{
+ struct scatterlist *sg;
+ int i, j;
+
+ j = pg_start;
+
+ WARN_ON(!mem->num_sg);
+
+ if (mem->num_sg == mem->page_count) {
+ for_each_sg(mem->sg_list, sg, mem->page_count, i) {
+ writel(agp_bridge->driver->mask_memory(agp_bridge,
+ sg_dma_address(sg), mask_type),
+ intel_private.gtt+j);
+ j++;
+ }
+ } else {
+ /* sg may merge pages, but we have to seperate
+ * per-page addr for GTT */
+ unsigned int len, m;
+
+ for_each_sg(mem->sg_list, sg, mem->num_sg, i) {
+ len = sg_dma_len(sg) / PAGE_SIZE;
+ for (m = 0; m < len; m++) {
+ writel(agp_bridge->driver->mask_memory(agp_bridge,
+ sg_dma_address(sg) + m * PAGE_SIZE,
+ mask_type),
+ intel_private.gtt+j);
+ j++;
+ }
+ }
+ }
+ readl(intel_private.gtt+j-1);
+}
+
+#else
+
+static void intel_agp_insert_sg_entries(struct agp_memory *mem,
+ off_t pg_start, int mask_type)
+{
+ int i, j;
+
+ for (i = 0, j = pg_start; i < mem->page_count; i++, j++) {
+ writel(agp_bridge->driver->mask_memory(agp_bridge,
+ phys_to_gart(page_to_phys(mem->pages[i])), mask_type),
+ intel_private.gtt+j);
+ }
+
+ readl(intel_private.gtt+j-1);
+}
+
+#endif
+
static int intel_i810_fetch_size(void)
{
u32 smram_miscc;
@@ -1003,9 +1138,13 @@ static int intel_i915_configure(void)
writel(agp_bridge->gatt_bus_addr|I810_PGETBL_ENABLED, intel_private.registers+I810_PGETBL_CTL);
readl(intel_private.registers+I810_PGETBL_CTL); /* PCI Posting. */
+#ifndef USE_PCI_DMA_API
+ agp_bridge->scratch_page_dma = agp_bridge->scratch_page;
+#endif
+
if (agp_bridge->driver->needs_scratch_page) {
for (i = intel_private.gtt_entries; i < current_size->num_entries; i++) {
- writel(agp_bridge->scratch_page, intel_private.gtt+i);
+ writel(agp_bridge->scratch_page_dma, intel_private.gtt+i);
}
readl(intel_private.gtt+i-1); /* PCI Posting. */
}
@@ -1038,7 +1177,7 @@ static void intel_i915_chipset_flush(struct agp_bridge_data *bridge)
static int intel_i915_insert_entries(struct agp_memory *mem, off_t pg_start,
int type)
{
- int i, j, num_entries;
+ int num_entries;
void *temp;
int ret = -EINVAL;
int mask_type;
@@ -1062,7 +1201,7 @@ static int intel_i915_insert_entries(struct agp_memory *mem, off_t pg_start,
if ((pg_start + mem->page_count) > num_entries)
goto out_err;
- /* The i915 can't check the GTT for entries since its read only,
+ /* The i915 can't check the GTT for entries since it's read only;
* depend on the caller to make the correct offset decisions.
*/
@@ -1078,14 +1217,7 @@ static int intel_i915_insert_entries(struct agp_memory *mem, off_t pg_start,
if (!mem->is_flushed)
global_cache_flush();
- for (i = 0, j = pg_start; i < mem->page_count; i++, j++) {
- writel(agp_bridge->driver->mask_memory(agp_bridge,
- phys_to_gart(page_to_phys(mem->pages[i])),
- mask_type),
- intel_private.gtt+j);
- }
-
- readl(intel_private.gtt+j-1);
+ intel_agp_insert_sg_entries(mem, pg_start, mask_type);
agp_bridge->driver->tlb_flush(mem);
out:
@@ -1110,7 +1242,7 @@ static int intel_i915_remove_entries(struct agp_memory *mem, off_t pg_start,
}
for (i = pg_start; i < (mem->page_count + pg_start); i++)
- writel(agp_bridge->scratch_page, intel_private.gtt+i);
+ writel(agp_bridge->scratch_page_dma, intel_private.gtt+i);
readl(intel_private.gtt+i-1);
@@ -2003,6 +2135,12 @@ static const struct agp_bridge_driver intel_915_driver = {
.agp_destroy_pages = agp_generic_destroy_pages,
.agp_type_to_mask_type = intel_i830_type_to_mask_type,
.chipset_flush = intel_i915_chipset_flush,
+#ifdef USE_PCI_DMA_API
+ .agp_map_page = intel_agp_map_page,
+ .agp_unmap_page = intel_agp_unmap_page,
+ .agp_map_memory = intel_agp_map_memory,
+ .agp_unmap_memory = intel_agp_unmap_memory,
+#endif
};
static const struct agp_bridge_driver intel_i965_driver = {
@@ -2031,6 +2169,12 @@ static const struct agp_bridge_driver intel_i965_driver = {
.agp_destroy_pages = agp_generic_destroy_pages,
.agp_type_to_mask_type = intel_i830_type_to_mask_type,
.chipset_flush = intel_i915_chipset_flush,
+#ifdef USE_PCI_DMA_API
+ .agp_map_page = intel_agp_map_page,
+ .agp_unmap_page = intel_agp_unmap_page,
+ .agp_map_memory = intel_agp_map_memory,
+ .agp_unmap_memory = intel_agp_unmap_memory,
+#endif
};
static const struct agp_bridge_driver intel_7505_driver = {
@@ -2085,6 +2229,12 @@ static const struct agp_bridge_driver intel_g33_driver = {
.agp_destroy_pages = agp_generic_destroy_pages,
.agp_type_to_mask_type = intel_i830_type_to_mask_type,
.chipset_flush = intel_i915_chipset_flush,
+#ifdef USE_PCI_DMA_API
+ .agp_map_page = intel_agp_map_page,
+ .agp_unmap_page = intel_agp_unmap_page,
+ .agp_map_memory = intel_agp_map_memory,
+ .agp_unmap_memory = intel_agp_unmap_memory,
+#endif
};
static int find_gmch(u16 device)
generated by cgit v1.2.3 (git 2.25.1) at 2024-07-11 23:37:24 +0000