gpu: nvgpu: Organize nvgpu_common.[ch]

Move nvgpu_common.c to drivers/gpu/nvgpu/common since it is a common
C file to all drivers.

Similarly move nvgpu_common.h to drivers/gpu/nvgpu/include/nvgpu since
this follows the new include guidelines.

Bug 1799159

Change-Id: I00ebed289973b27704c2cff073526e36505bf699
Signed-off-by: Alex Waterman <alexw@nvidia.com>
Reviewed-on: http://git-master/r/1284612
Reviewed-by: Varun Colbert <vcolbert@nvidia.com>
Tested-by: Varun Colbert <vcolbert@nvidia.com>

1 files changed, 277 insertions, 0 deletions

diff --git a/drivers/gpu/nvgpu/common/nvgpu_common.c b/drivers/gpu/nvgpu/common/nvgpu_common.c
new file mode 100644
index 00000000..80f1cca0
--- /dev/null
+++ b/drivers/gpu/nvgpu/common/nvgpu_common.c
@@ -0,0 +1,277 @@
+/*
+ * Copyright (c) 2016-2017, 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/dma-mapping.h>
+#include <linux/firmware.h>
+
+#include "gk20a/gk20a_scale.h"
+#include "gk20a/gk20a.h"
+
+#include <nvgpu/nvgpu_common.h>
+
+#define EMC3D_DEFAULT_RATIO 750
+
+static void nvgpu_init_vars(struct gk20a *g)
+{
+        struct gk20a_platform *platform = dev_get_drvdata(g->dev);
+
+        init_waitqueue_head(&g->sw_irq_stall_last_handled_wq);
+        init_waitqueue_head(&g->sw_irq_nonstall_last_handled_wq);
+        gk20a_init_gr(g);
+
+        init_rwsem(&g->busy_lock);
+
+        spin_lock_init(&g->mc_enable_lock);
+
+        mutex_init(&platform->railgate_lock);
+        mutex_init(&g->dbg_sessions_lock);
+        mutex_init(&g->client_lock);
+        mutex_init(&g->ch_wdt_lock);
+        mutex_init(&g->poweroff_lock);
+
+        g->regs_saved = g->regs;
+        g->bar1_saved = g->bar1;
+
+        g->emc3d_ratio = EMC3D_DEFAULT_RATIO;
+
+        /* Set DMA parameters to allow larger sgt lists */
+        g->dev->dma_parms = &g->dma_parms;
+        dma_set_max_seg_size(g->dev, UINT_MAX);
+
+        INIT_LIST_HEAD(&g->pending_sema_waits);
+        raw_spin_lock_init(&g->pending_sema_waits_lock);
+}
+
+static void nvgpu_init_timeout(struct gk20a *g)
+{
+        g->gr_idle_timeout_default = CONFIG_GK20A_DEFAULT_TIMEOUT;
+        if (tegra_platform_is_silicon())
+                g->timeouts_enabled = true;
+}
+
+static void nvgpu_init_timeslice(struct gk20a *g)
+{
+        g->runlist_interleave = true;
+
+        g->timeslice_low_priority_us = 1300;
+        g->timeslice_medium_priority_us = 2600;
+        g->timeslice_high_priority_us = 5200;
+
+        g->min_timeslice_us = 1000;
+        g->max_timeslice_us = 50000;
+}
+
+static void nvgpu_init_pm_vars(struct gk20a *g)
+{
+        struct gk20a_platform *platform = dev_get_drvdata(g->dev);
+
+        /*
+         * Set up initial power settings. For non-slicon platforms, disable
+         * power features and for silicon platforms, read from platform data
+         */
+        g->slcg_enabled =
+                tegra_platform_is_silicon() ? platform->enable_slcg : false;
+        g->blcg_enabled =
+                tegra_platform_is_silicon() ? platform->enable_blcg : false;
+        g->elcg_enabled =
+                tegra_platform_is_silicon() ? platform->enable_elcg : false;
+        g->elpg_enabled =
+                tegra_platform_is_silicon() ? platform->enable_elpg : false;
+        g->aelpg_enabled =
+                tegra_platform_is_silicon() ? platform->enable_aelpg : false;
+        g->mscg_enabled =
+                tegra_platform_is_silicon() ? platform->enable_mscg : false;
+
+        /* set default values to aelpg parameters */
+        g->pmu.aelpg_param[0] = APCTRL_SAMPLING_PERIOD_PG_DEFAULT_US;
+        g->pmu.aelpg_param[1] = APCTRL_MINIMUM_IDLE_FILTER_DEFAULT_US;
+        g->pmu.aelpg_param[2] = APCTRL_MINIMUM_TARGET_SAVING_DEFAULT_US;
+        g->pmu.aelpg_param[3] = APCTRL_POWER_BREAKEVEN_DEFAULT_US;
+        g->pmu.aelpg_param[4] = APCTRL_CYCLES_PER_SAMPLE_MAX_DEFAULT;
+}
+
+static void nvgpu_init_mm_vars(struct gk20a *g)
+{
+        struct gk20a_platform *platform = dev_get_drvdata(g->dev);
+
+        g->mm.bypass_smmu = platform->bypass_smmu;
+        g->mm.disable_bigpage = platform->disable_bigpage;
+        g->mm.vidmem_is_vidmem = platform->vidmem_is_vidmem;
+}
+
+int nvgpu_probe(struct gk20a *g,
+                const char *debugfs_symlink,
+                const char *interface_name,
+                struct class *class)
+{
+        struct gk20a_platform *platform = dev_get_drvdata(g->dev);
+        int err = 0;
+
+        nvgpu_init_vars(g);
+        nvgpu_init_timeout(g);
+        nvgpu_init_timeslice(g);
+        nvgpu_init_pm_vars(g);
+
+        /* Initialize the platform interface. */
+        err = platform->probe(g->dev);
+        if (err) {
+                dev_err(g->dev, "platform probe failed");
+                return err;
+        }
+
+        /* platform probe can defer do user init only if probe succeeds */
+        err = gk20a_user_init(g->dev, interface_name, class);
+        if (err)
+                return err;
+
+
+        /* Initialise scaling */
+        if (IS_ENABLED(CONFIG_GK20A_DEVFREQ))
+                gk20a_scale_init(g->dev);
+
+        err = gk20a_secure_page_alloc(g->dev);
+        if (err)
+                dev_err(g->dev,
+                        "failed to allocate secure buffer %d\n", err);
+
+        if (platform->late_probe) {
+                err = platform->late_probe(g->dev);
+                if (err) {
+                        dev_err(g->dev, "late probe failed");
+                        return err;
+                }
+        }
+
+        nvgpu_init_mm_vars(g);
+
+        gk20a_create_sysfs(g->dev);
+        gk20a_debug_init(g->dev, debugfs_symlink);
+
+        g->dbg_regops_tmp_buf = kzalloc(SZ_4K, GFP_KERNEL);
+        if (!g->dbg_regops_tmp_buf) {
+                dev_err(g->dev, "couldn't allocate regops tmp buf");
+                return -ENOMEM;
+        }
+        g->dbg_regops_tmp_buf_ops =
+                SZ_4K / sizeof(g->dbg_regops_tmp_buf[0]);
+
+        g->remove_support = gk20a_remove_support;
+
+        return 0;
+}
+
+static const struct firmware *do_request_firmware(struct device *dev,
+                const char *prefix, const char *fw_name, int flags)
+{
+        const struct firmware *fw;
+        char *fw_path = NULL;
+        int path_len, err;
+
+        if (prefix) {
+                path_len = strlen(prefix) + strlen(fw_name);
+                path_len += 2; /* for the path separator and zero terminator*/
+
+                fw_path = kzalloc(sizeof(*fw_path) * path_len, GFP_KERNEL);
+                if (!fw_path)
+                        return NULL;
+
+                sprintf(fw_path, "%s/%s", prefix, fw_name);
+                fw_name = fw_path;
+        }
+
+#if LINUX_VERSION_CODE < KERNEL_VERSION(3,18,0)
+        err = request_firmware(&fw, fw_name, dev);
+#else
+        if (flags & NVGPU_REQUEST_FIRMWARE_NO_WARN)
+                err = request_firmware_direct(&fw, fw_name, dev);
+        else
+                err = request_firmware(&fw, fw_name, dev);
+#endif
+
+        kfree(fw_path);
+        if (err)
+                return NULL;
+        return fw;
+}
+
+/* This is a simple wrapper around request_firmware that takes 'fw_name' and
+ * applies an IP specific relative path prefix to it. The caller is
+ * responsible for calling release_firmware later. */
+const struct firmware *nvgpu_request_firmware(struct gk20a *g,
+                                              const char *fw_name,
+                                              int flags)
+{
+        struct device *dev = g->dev;
+        const struct firmware *fw;
+
+        /* current->fs is NULL when calling from SYS_EXIT.
+           Add a check here to prevent crash in request_firmware */
+        if (!current->fs || !fw_name)
+                return NULL;
+
+        BUG_ON(!g->ops.name);
+        fw = do_request_firmware(dev, g->ops.name, fw_name, flags);
+
+#ifdef CONFIG_TEGRA_GK20A
+        /* TO BE REMOVED - Support loading from legacy SOC specific path. */
+        if (!fw && !(flags & NVGPU_REQUEST_FIRMWARE_NO_SOC)) {
+                struct gk20a_platform *platform = gk20a_get_platform(dev);
+                fw = do_request_firmware(dev,
+                                platform->soc_name, fw_name, flags);
+        }
+#endif
+
+        return fw;
+}
+
+/**
+ * cyclic_delta - Returns delta of cyclic integers a and b.
+ *
+ * @a - First integer
+ * @b - Second integer
+ *
+ * Note: if a is ahead of b, delta is positive.
+ */
+static int cyclic_delta(int a, int b)
+{
+        return a - b;
+}
+
+/**
+ * nvgpu_wait_for_deferred_interrupts - Wait for interrupts to complete
+ *
+ * @g - The GPU to wait on.
+ *
+ * Waits until all interrupt handlers that have been scheduled to run have
+ * completed.
+ */
+void nvgpu_wait_for_deferred_interrupts(struct gk20a *g)
+{
+        int stall_irq_threshold = atomic_read(&g->hw_irq_stall_count);
+        int nonstall_irq_threshold = atomic_read(&g->hw_irq_nonstall_count);
+
+        /* wait until all stalling irqs are handled */
+        wait_event(g->sw_irq_stall_last_handled_wq,
+                   cyclic_delta(stall_irq_threshold,
+                                atomic_read(&g->sw_irq_stall_last_handled))
+                   <= 0);
+
+        /* wait until all non-stalling irqs are handled */
+        wait_event(g->sw_irq_nonstall_last_handled_wq,
+                   cyclic_delta(nonstall_irq_threshold,
+                                atomic_read(&g->sw_irq_nonstall_last_handled))
+                   <= 0);
+}