drm/radeon: introduce kernel modesetting for radeon hardware

Add kernel modesetting support to radeon driver, use the ttm memory
manager to manage memory and DRM/GEM to provide userspace API.
In order to avoid backward compatibility issue and to allow clean
design and code the radeon kernel modesetting use different code path
than old radeon/drm driver.

When kernel modesetting is enabled the IOCTL of radeon/drm
driver are considered as invalid and an error message is printed
in the log and they return failure.

KMS enabled userspace will use new API to talk with the radeon/drm
driver. The new API provide functions to create/destroy/share/mmap
buffer object which are then managed by the kernel memory manager
(here TTM). In order to submit command to the GPU the userspace
provide a buffer holding the command stream, along this buffer
userspace have to provide a list of buffer object used by the
command stream. The kernel radeon driver will then place buffer
in GPU accessible memory and will update command stream to reflect
the position of the different buffers.

The kernel will also perform security check on command stream
provided by the user, we want to catch and forbid any illegal use
of the GPU such as DMA into random system memory or into memory
not owned by the process supplying the command stream. This part
of the code is still incomplete and this why we propose that patch
as a staging driver addition, future security might forbid current
experimental userspace to run.

This code support the following hardware : R1XX,R2XX,R3XX,R4XX,R5XX
(radeon up to X1950). Works is underway to provide support for R6XX,
R7XX and newer hardware (radeon from HD2XXX to HD4XXX).

Authors:
    Jerome Glisse <jglisse@redhat.com>
    Dave Airlie <airlied@redhat.com>
    Alex Deucher <alexdeucher@gmail.com>

Signed-off-by: Jerome Glisse <jglisse@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
Signed-off-by: Alex Deucher <alexdeucher@gmail.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>

1 files changed, 223 insertions, 0 deletions

diff --git a/drivers/gpu/drm/radeon/r420.c b/drivers/gpu/drm/radeon/r420.c
new file mode 100644
index 000000000000..dea497a979f2
--- /dev/null
+++ b/drivers/gpu/drm/radeon/r420.c
@@ -0,0 +1,223 @@
+/*
+ * Copyright 2008 Advanced Micro Devices, Inc.
+ * Copyright 2008 Red Hat Inc.
+ * Copyright 2009 Jerome Glisse.
+ *
+ * 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 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 COPYRIGHT HOLDER(S) OR AUTHOR(S) 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.
+ *
+ * Authors: Dave Airlie
+ *          Alex Deucher
+ *          Jerome Glisse
+ */
+#include <linux/seq_file.h>
+#include "drmP.h"
+#include "radeon_reg.h"
+#include "radeon.h"
+
+/* r420,r423,rv410 depends on : */
+void r100_pci_gart_disable(struct radeon_device *rdev);
+void r100_hdp_reset(struct radeon_device *rdev);
+void r100_mc_setup(struct radeon_device *rdev);
+int r100_gui_wait_for_idle(struct radeon_device *rdev);
+void r100_mc_disable_clients(struct radeon_device *rdev);
+void r300_vram_info(struct radeon_device *rdev);
+int r300_mc_wait_for_idle(struct radeon_device *rdev);
+int rv370_pcie_gart_enable(struct radeon_device *rdev);
+void rv370_pcie_gart_disable(struct radeon_device *rdev);
+
+/* This files gather functions specifics to :
+ * r420,r423,rv410
+ *
+ * Some of these functions might be used by newer ASICs.
+ */
+void r420_gpu_init(struct radeon_device *rdev);
+int r420_debugfs_pipes_info_init(struct radeon_device *rdev);
+
+
+/*
+ * MC
+ */
+int r420_mc_init(struct radeon_device *rdev)
+{
+        int r;
+
+        if (r100_debugfs_rbbm_init(rdev)) {
+                DRM_ERROR("Failed to register debugfs file for RBBM !\n");
+        }
+        if (r420_debugfs_pipes_info_init(rdev)) {
+                DRM_ERROR("Failed to register debugfs file for pipes !\n");
+        }
+
+        r420_gpu_init(rdev);
+        r100_pci_gart_disable(rdev);
+        if (rdev->flags & RADEON_IS_PCIE) {
+                rv370_pcie_gart_disable(rdev);
+        }
+
+        /* Setup GPU memory space */
+        rdev->mc.vram_location = 0xFFFFFFFFUL;
+        rdev->mc.gtt_location = 0xFFFFFFFFUL;
+        if (rdev->flags & RADEON_IS_AGP) {
+                r = radeon_agp_init(rdev);
+                if (r) {
+                        printk(KERN_WARNING "[drm] Disabling AGP\n");
+                        rdev->flags &= ~RADEON_IS_AGP;
+                        rdev->mc.gtt_size = radeon_gart_size * 1024 * 1024;
+                } else {
+                        rdev->mc.gtt_location = rdev->mc.agp_base;
+                }
+        }
+        r = radeon_mc_setup(rdev);
+        if (r) {
+                return r;
+        }
+
+        /* Program GPU memory space */
+        r100_mc_disable_clients(rdev);
+        if (r300_mc_wait_for_idle(rdev)) {
+                printk(KERN_WARNING "Failed to wait MC idle while "
+                       "programming pipes. Bad things might happen.\n");
+        }
+        r100_mc_setup(rdev);
+        return 0;
+}
+
+void r420_mc_fini(struct radeon_device *rdev)
+{
+        rv370_pcie_gart_disable(rdev);
+        radeon_gart_table_vram_free(rdev);
+        radeon_gart_fini(rdev);
+}
+
+
+/*
+ * Global GPU functions
+ */
+void r420_errata(struct radeon_device *rdev)
+{
+        rdev->pll_errata = 0;
+}
+
+void r420_pipes_init(struct radeon_device *rdev)
+{
+        unsigned tmp;
+        unsigned gb_pipe_select;
+        unsigned num_pipes;
+
+        /* GA_ENHANCE workaround TCL deadlock issue */
+        WREG32(0x4274, (1 << 0) | (1 << 1) | (1 << 2) | (1 << 3));
+        /* get max number of pipes */
+        gb_pipe_select = RREG32(0x402C);
+        num_pipes = ((gb_pipe_select >> 12) & 3) + 1;
+        rdev->num_gb_pipes = num_pipes;
+        tmp = 0;
+        switch (num_pipes) {
+        default:
+                /* force to 1 pipe */
+                num_pipes = 1;
+        case 1:
+                tmp = (0 << 1);
+                break;
+        case 2:
+                tmp = (3 << 1);
+                break;
+        case 3:
+                tmp = (6 << 1);
+                break;
+        case 4:
+                tmp = (7 << 1);
+                break;
+        }
+        WREG32(0x42C8, (1 << num_pipes) - 1);
+        /* Sub pixel 1/12 so we can have 4K rendering according to doc */
+        tmp |= (1 << 4) | (1 << 0);
+        WREG32(0x4018, tmp);
+        if (r100_gui_wait_for_idle(rdev)) {
+                printk(KERN_WARNING "Failed to wait GUI idle while "
+                       "programming pipes. Bad things might happen.\n");
+        }
+
+        tmp = RREG32(0x170C);
+        WREG32(0x170C, tmp | (1 << 31));
+
+        WREG32(R300_RB2D_DSTCACHE_MODE,
+               RREG32(R300_RB2D_DSTCACHE_MODE) |
+               R300_DC_AUTOFLUSH_ENABLE |
+               R300_DC_DC_DISABLE_IGNORE_PE);
+
+        if (r100_gui_wait_for_idle(rdev)) {
+                printk(KERN_WARNING "Failed to wait GUI idle while "
+                       "programming pipes. Bad things might happen.\n");
+        }
+        DRM_INFO("radeon: %d pipes initialized.\n", rdev->num_gb_pipes);
+}
+
+void r420_gpu_init(struct radeon_device *rdev)
+{
+        r100_hdp_reset(rdev);
+        r420_pipes_init(rdev);
+        if (r300_mc_wait_for_idle(rdev)) {
+                printk(KERN_WARNING "Failed to wait MC idle while "
+                       "programming pipes. Bad things might happen.\n");
+        }
+}
+
+
+/*
+ * r420,r423,rv410 VRAM info
+ */
+void r420_vram_info(struct radeon_device *rdev)
+{
+        r300_vram_info(rdev);
+}
+
+
+/*
+ * Debugfs info
+ */
+#if defined(CONFIG_DEBUG_FS)
+static int r420_debugfs_pipes_info(struct seq_file *m, void *data)
+{
+        struct drm_info_node *node = (struct drm_info_node *) m->private;
+        struct drm_device *dev = node->minor->dev;
+        struct radeon_device *rdev = dev->dev_private;
+        uint32_t tmp;
+
+        tmp = RREG32(R400_GB_PIPE_SELECT);
+        seq_printf(m, "GB_PIPE_SELECT 0x%08x\n", tmp);
+        tmp = RREG32(R300_GB_TILE_CONFIG);
+        seq_printf(m, "GB_TILE_CONFIG 0x%08x\n", tmp);
+        tmp = RREG32(R300_DST_PIPE_CONFIG);
+        seq_printf(m, "DST_PIPE_CONFIG 0x%08x\n", tmp);
+        return 0;
+}
+
+static struct drm_info_list r420_pipes_info_list[] = {
+        {"r420_pipes_info", r420_debugfs_pipes_info, 0, NULL},
+};
+#endif
+
+int r420_debugfs_pipes_info_init(struct radeon_device *rdev)
+{
+#if defined(CONFIG_DEBUG_FS)
+        return radeon_debugfs_add_files(rdev, r420_pipes_info_list, 1);
+#else
+        return 0;
+#endif
+}