1 files changed, 183 insertions, 0 deletions

diff --git a/drivers/gpu/drm/drm_pci.c b/drivers/gpu/drm/drm_pci.c
new file mode 100644
index 000000000000..b55d5bc6ea61
--- /dev/null
+++ b/drivers/gpu/drm/drm_pci.c
@@ -0,0 +1,183 @@
+/* drm_pci.h -- PCI DMA memory management wrappers for DRM -*- linux-c -*- */
+/**
+ * \file drm_pci.c
+ * \brief Functions and ioctls to manage PCI memory
+ *
+ * \warning These interfaces aren't stable yet.
+ *
+ * \todo Implement the remaining ioctl's for the PCI pools.
+ * \todo The wrappers here are so thin that they would be better off inlined..
+ *
+ * \author José Fonseca <jrfonseca@tungstengraphics.com>
+ * \author Leif Delgass <ldelgass@retinalburn.net>
+ */
+
+/*
+ * Copyright 2003 José Fonseca.
+ * Copyright 2003 Leif Delgass.
+ * All Rights Reserved.
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice (including the next
+ * paragraph) shall be included in all copies or substantial portions of the
+ * Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL THE
+ * AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
+ * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
+ * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#include <linux/pci.h>
+#include <linux/dma-mapping.h>
+#include "drmP.h"
+
+/**********************************************************************/
+/** \name PCI memory */
+/*@{*/
+
+/**
+ * \brief Allocate a PCI consistent memory block, for DMA.
+ */
+drm_dma_handle_t *drm_pci_alloc(struct drm_device * dev, size_t size, size_t align,
+                                dma_addr_t maxaddr)
+{
+        drm_dma_handle_t *dmah;
+#if 1
+        unsigned long addr;
+        size_t sz;
+#endif
+#ifdef DRM_DEBUG_MEMORY
+        int area = DRM_MEM_DMA;
+
+        spin_lock(&drm_mem_lock);
+        if ((drm_ram_used >> PAGE_SHIFT)
+            > (DRM_RAM_PERCENT * drm_ram_available) / 100) {
+                spin_unlock(&drm_mem_lock);
+                return 0;
+        }
+        spin_unlock(&drm_mem_lock);
+#endif
+
+        /* pci_alloc_consistent only guarantees alignment to the smallest
+         * PAGE_SIZE order which is greater than or equal to the requested size.
+         * Return NULL here for now to make sure nobody tries for larger alignment
+         */
+        if (align > size)
+                return NULL;
+
+        if (pci_set_dma_mask(dev->pdev, maxaddr) != 0) {
+                DRM_ERROR("Setting pci dma mask failed\n");
+                return NULL;
+        }
+
+        dmah = kmalloc(sizeof(drm_dma_handle_t), GFP_KERNEL);
+        if (!dmah)
+                return NULL;
+
+        dmah->size = size;
+        dmah->vaddr = dma_alloc_coherent(&dev->pdev->dev, size, &dmah->busaddr, GFP_KERNEL | __GFP_COMP);
+
+#ifdef DRM_DEBUG_MEMORY
+        if (dmah->vaddr == NULL) {
+                spin_lock(&drm_mem_lock);
+                ++drm_mem_stats[area].fail_count;
+                spin_unlock(&drm_mem_lock);
+                kfree(dmah);
+                return NULL;
+        }
+
+        spin_lock(&drm_mem_lock);
+        ++drm_mem_stats[area].succeed_count;
+        drm_mem_stats[area].bytes_allocated += size;
+        drm_ram_used += size;
+        spin_unlock(&drm_mem_lock);
+#else
+        if (dmah->vaddr == NULL) {
+                kfree(dmah);
+                return NULL;
+        }
+#endif
+
+        memset(dmah->vaddr, 0, size);
+
+        /* XXX - Is virt_to_page() legal for consistent mem? */
+        /* Reserve */
+        for (addr = (unsigned long)dmah->vaddr, sz = size;
+             sz > 0; addr += PAGE_SIZE, sz -= PAGE_SIZE) {
+                SetPageReserved(virt_to_page(addr));
+        }
+
+        return dmah;
+}
+
+EXPORT_SYMBOL(drm_pci_alloc);
+
+/**
+ * \brief Free a PCI consistent memory block without freeing its descriptor.
+ *
+ * This function is for internal use in the Linux-specific DRM core code.
+ */
+void __drm_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah)
+{
+#if 1
+        unsigned long addr;
+        size_t sz;
+#endif
+#ifdef DRM_DEBUG_MEMORY
+        int area = DRM_MEM_DMA;
+        int alloc_count;
+        int free_count;
+#endif
+
+        if (!dmah->vaddr) {
+#ifdef DRM_DEBUG_MEMORY
+                DRM_MEM_ERROR(area, "Attempt to free address 0\n");
+#endif
+        } else {
+                /* XXX - Is virt_to_page() legal for consistent mem? */
+                /* Unreserve */
+                for (addr = (unsigned long)dmah->vaddr, sz = dmah->size;
+                     sz > 0; addr += PAGE_SIZE, sz -= PAGE_SIZE) {
+                        ClearPageReserved(virt_to_page(addr));
+                }
+                dma_free_coherent(&dev->pdev->dev, dmah->size, dmah->vaddr,
+                                  dmah->busaddr);
+        }
+
+#ifdef DRM_DEBUG_MEMORY
+        spin_lock(&drm_mem_lock);
+        free_count = ++drm_mem_stats[area].free_count;
+        alloc_count = drm_mem_stats[area].succeed_count;
+        drm_mem_stats[area].bytes_freed += size;
+        drm_ram_used -= size;
+        spin_unlock(&drm_mem_lock);
+        if (free_count > alloc_count) {
+                DRM_MEM_ERROR(area,
+                              "Excess frees: %d frees, %d allocs\n",
+                              free_count, alloc_count);
+        }
+#endif
+
+}
+
+/**
+ * \brief Free a PCI consistent memory block
+ */
+void drm_pci_free(struct drm_device * dev, drm_dma_handle_t * dmah)
+{
+        __drm_pci_free(dev, dmah);
+        kfree(dmah);
+}
+
+EXPORT_SYMBOL(drm_pci_free);
+
+/*@}*/