gpu: nvgpu: Add PCIe device support

Add support for probing PCIe graphics cards.

JIRA DNVGPU-7

Change-Id: Iad3d31a1dc0ca6575d8a9916857022cac9181948
Signed-off-by: Terje Bergstrom <tbergstrom@nvidia.com>
Reviewed-on: http://git-master/r/1127684

1 files changed, 264 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/pci.c b/drivers/gpu/nvgpu/pci.c
new file mode 100644
index 00000000..bc8cb510
--- /dev/null
+++ b/drivers/gpu/nvgpu/pci.c
@@ -0,0 +1,264 @@
+/*
+ * Copyright (c) 2016, NVIDIA CORPORATION.  All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
+ * more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#include <linux/pci.h>
+#include <linux/interrupt.h>
+#include <linux/pm_runtime.h>
+#include "pci.h"
+#include "gk20a/gk20a.h"
+#include "gk20a/platform_gk20a.h"
+
+#define PCI_INTERFACE_NAME "nvgpu-pci%s"
+
+static int nvgpu_pci_tegra_probe(struct device *dev)
+{
+        return 0;
+}
+
+static int nvgpu_pci_tegra_remove(struct device *dev)
+{
+        return 0;
+}
+
+static bool nvgpu_pci_tegra_is_railgated(struct device *pdev)
+{
+        return false;
+}
+
+static int nvgpu_pci_busy(struct device *dev)
+{
+        struct gk20a *g = get_gk20a(dev);
+        int err = 0;
+
+        if (!g->power_on)
+                err = gk20a_pm_finalize_poweron(dev);
+
+        return err;
+}
+
+struct gk20a_platform nvgpu_pci_device = {
+        /* ptimer src frequency in hz */
+        .ptimer_src_freq        = 31250000,
+
+        .probe = nvgpu_pci_tegra_probe,
+        .remove = nvgpu_pci_tegra_remove,
+        .busy = nvgpu_pci_busy,
+
+        /* power management callbacks */
+        .is_railgated = nvgpu_pci_tegra_is_railgated,
+
+        .default_big_page_size  = SZ_64K,
+};
+
+static struct pci_device_id nvgpu_pci_table[] = {
+        {
+                PCI_DEVICE(PCI_VENDOR_ID_NVIDIA, PCI_ANY_ID),
+                .class = PCI_BASE_CLASS_DISPLAY << 16,
+                .class_mask = 0xff << 16,
+        },
+        {}
+};
+
+static irqreturn_t nvgpu_pci_isr(int irq, void *dev_id)
+{
+        struct gk20a *g = dev_id;
+        irqreturn_t ret_stall;
+        irqreturn_t ret_nonstall;
+
+        ret_stall = g->ops.mc.isr_stall(g);
+        ret_nonstall = g->ops.mc.isr_nonstall(g);
+
+        return (ret_stall == IRQ_NONE && ret_nonstall == IRQ_NONE) ?
+                IRQ_NONE : IRQ_WAKE_THREAD;
+}
+
+static irqreturn_t nvgpu_pci_intr_thread(int irq, void *dev_id)
+{
+        struct gk20a *g = dev_id;
+
+        g->ops.mc.isr_thread_stall(g);
+        g->ops.mc.isr_thread_nonstall(g);
+
+        return IRQ_HANDLED;
+}
+
+static int nvgpu_pci_init_support(struct pci_dev *pdev)
+{
+        int err = 0;
+        struct gk20a *g = get_gk20a(&pdev->dev);
+
+        g->regs = ioremap(pci_resource_start(pdev, 0),
+                          pci_resource_len(pdev, 0));
+        if (IS_ERR(g->regs)) {
+                gk20a_err(dev_from_gk20a(g), "failed to remap gk20a registers");
+                err = PTR_ERR(g->regs);
+                goto fail;
+        }
+
+        g->bar1 = ioremap(pci_resource_start(pdev, 1),
+                          pci_resource_len(pdev, 1));
+        if (IS_ERR(g->bar1)) {
+                gk20a_err(dev_from_gk20a(g), "failed to remap gk20a bar1");
+                err = PTR_ERR(g->regs);
+                goto fail;
+        }
+
+        g->regs_saved = g->regs;
+        g->bar1_saved = g->bar1;
+
+        mutex_init(&g->dbg_sessions_lock);
+        mutex_init(&g->client_lock);
+        mutex_init(&g->ch_wdt_lock);
+        mutex_init(&g->poweroff_lock);
+
+        g->remove_support = gk20a_remove_support;
+        return 0;
+
+ fail:
+        gk20a_remove_support(&pdev->dev);
+        return err;
+}
+
+static int nvgpu_pci_probe(struct pci_dev *pdev,
+                           const struct pci_device_id *pent)
+{
+        struct gk20a_platform *platform = &nvgpu_pci_device;
+        struct gk20a *g;
+        int err;
+
+        pci_set_drvdata(pdev, platform);
+
+        g = kzalloc(sizeof(struct gk20a), GFP_KERNEL);
+        if (!g) {
+                gk20a_err(&pdev->dev, "couldn't allocate gk20a support");
+                return -ENOMEM;
+        }
+
+        init_waitqueue_head(&g->sw_irq_stall_last_handled_wq);
+        init_waitqueue_head(&g->sw_irq_nonstall_last_handled_wq);
+
+        platform->g = g;
+        g->dev = &pdev->dev;
+
+        err = pci_enable_device(pdev);
+        if (err)
+                return err;
+        pci_set_master(pdev);
+
+        g->irq_stall = pdev->irq;
+        g->irq_nonstall = pdev->irq;
+        if (g->irq_stall < 0)
+                return -ENXIO;
+        err = devm_request_threaded_irq(&pdev->dev,
+                        g->irq_stall,
+                        nvgpu_pci_isr,
+                        nvgpu_pci_intr_thread,
+                        IRQF_SHARED, "nvgpu", g);
+        if (err) {
+                gk20a_err(&pdev->dev,
+                        "failed to request irq @ %d", g->irq_stall);
+                return err;
+        }
+        disable_irq(g->irq_stall);
+
+        err = gk20a_user_init(&pdev->dev, PCI_INTERFACE_NAME);
+        if (err)
+                return err;
+
+        err = nvgpu_pci_init_support(pdev);
+        if (err)
+                return err;
+
+        init_rwsem(&g->busy_lock);
+        mutex_init(&platform->railgate_lock);
+
+        spin_lock_init(&g->mc_enable_lock);
+
+        gk20a_debug_init(&pdev->dev);
+
+        /* Initialize the platform interface. */
+        err = platform->probe(&pdev->dev);
+        if (err) {
+                gk20a_err(&pdev->dev, "platform probe failed");
+                return err;
+        }
+
+        /* Set DMA parameters to allow larger sgt lists */
+        pdev->dev.dma_parms = &g->dma_parms;
+        dma_set_max_seg_size(&pdev->dev, UINT_MAX);
+
+        g->gr_idle_timeout_default =
+                        CONFIG_GK20A_DEFAULT_TIMEOUT;
+        if (tegra_platform_is_silicon())
+                g->timeouts_enabled = true;
+
+        g->runlist_interleave = true;
+
+        g->timeslice_low_priority_us = 1300;
+        g->timeslice_medium_priority_us = 2600;
+        g->timeslice_high_priority_us = 5200;
+
+        gk20a_create_sysfs(&pdev->dev);
+
+        g->mm.has_physical_mode = false;
+        g->mm.vidmem_is_vidmem = true;
+        g->mm.ltc_enabled = true;
+        g->mm.ltc_enabled_debug = true;
+        g->mm.bypass_smmu = platform->bypass_smmu;
+        g->mm.disable_bigpage = platform->disable_bigpage;
+
+        gk20a_init_gr(g);
+
+        return 0;
+}
+
+static void nvgpu_pci_remove(struct pci_dev *pdev)
+{
+        struct gk20a_platform *platform = gk20a_get_platform(&pdev->dev);
+        struct gk20a *g = get_gk20a(&pdev->dev);
+
+        if (g->remove_support)
+                g->remove_support(g->dev);
+
+        gk20a_user_deinit(g->dev);
+
+        debugfs_remove_recursive(platform->debugfs);
+        debugfs_remove_recursive(platform->debugfs_alias);
+
+        gk20a_remove_sysfs(g->dev);
+
+        if (platform->remove)
+                platform->remove(g->dev);
+
+        kfree(g);
+}
+
+static struct pci_driver nvgpu_pci_driver = {
+        .name = "nvgpu",
+        .id_table = nvgpu_pci_table,
+        .probe = nvgpu_pci_probe,
+        .remove = nvgpu_pci_remove,
+};
+
+int __init nvgpu_pci_init(void)
+{
+        return pci_register_driver(&nvgpu_pci_driver);
+}
+
+void __exit nvgpu_pci_exit(void)
+{
+        pci_unregister_driver(&nvgpu_pci_driver);
+}