drm/i915/gvt: Introduce a framework for tracking HW registers.
This patch introduces a framework for tracking HW registers on different
GEN platforms.
Accesses to GEN HW registers from VMs will be trapped by hypervisor. It
will forward these emulation requests to GVT-g device model, which
requires this framework to search for related register descriptions.
Each MMIO entry in this framework describes a GEN HW registers, e.g.
offset, length, whether it contains RO bits, whether it can be accessed by
LRIs...and also emulation handlers for emulating register reading and
writing.
- Use i915 MMIO register definition & statement.(Joonas)
Signed-off-by: Zhi Wang <zhi.a.wang@intel.com>
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
diff --git a/drivers/gpu/drm/i915/gvt/handlers.c b/drivers/gpu/drm/i915/gvt/handlers.c
new file mode 100644
index 0000000..6222218
--- /dev/null
+++ b/drivers/gpu/drm/i915/gvt/handlers.c
@@ -0,0 +1,247 @@
+/*
+ * Copyright(c) 2011-2016 Intel Corporation. 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 OR COPYRIGHT HOLDERS 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:
+ * Kevin Tian <kevin.tian@intel.com>
+ * Eddie Dong <eddie.dong@intel.com>
+ * Zhiyuan Lv <zhiyuan.lv@intel.com>
+ *
+ * Contributors:
+ * Min He <min.he@intel.com>
+ * Tina Zhang <tina.zhang@intel.com>
+ * Pei Zhang <pei.zhang@intel.com>
+ * Niu Bing <bing.niu@intel.com>
+ * Ping Gao <ping.a.gao@intel.com>
+ * Zhi Wang <zhi.a.wang@intel.com>
+ *
+
+ */
+
+#include "i915_drv.h"
+
+/* Register contains RO bits */
+#define F_RO (1 << 0)
+/* Register contains graphics address */
+#define F_GMADR (1 << 1)
+/* Mode mask registers with high 16 bits as the mask bits */
+#define F_MODE_MASK (1 << 2)
+/* This reg can be accessed by GPU commands */
+#define F_CMD_ACCESS (1 << 3)
+/* This reg has been accessed by a VM */
+#define F_ACCESSED (1 << 4)
+/* This reg has been accessed through GPU commands */
+#define F_CMD_ACCESSED (1 << 5)
+/* This reg could be accessed by unaligned address */
+#define F_UNALIGN (1 << 6)
+
+unsigned long intel_gvt_get_device_type(struct intel_gvt *gvt)
+{
+ if (IS_BROADWELL(gvt->dev_priv))
+ return D_BDW;
+ else if (IS_SKYLAKE(gvt->dev_priv))
+ return D_SKL;
+
+ return 0;
+}
+
+bool intel_gvt_match_device(struct intel_gvt *gvt,
+ unsigned long device)
+{
+ return intel_gvt_get_device_type(gvt) & device;
+}
+
+static int new_mmio_info(struct intel_gvt *gvt,
+ u32 offset, u32 flags, u32 size,
+ u32 addr_mask, u32 ro_mask, u32 device,
+ void *read, void *write)
+{
+ struct intel_gvt_mmio_info *info, *p;
+ u32 start, end, i;
+
+ if (!intel_gvt_match_device(gvt, device))
+ return 0;
+
+ if (WARN_ON(!IS_ALIGNED(offset, 4)))
+ return -EINVAL;
+
+ start = offset;
+ end = offset + size;
+
+ for (i = start; i < end; i += 4) {
+ info = kzalloc(sizeof(*info), GFP_KERNEL);
+ if (!info)
+ return -ENOMEM;
+
+ info->offset = i;
+ p = intel_gvt_find_mmio_info(gvt, info->offset);
+ if (p)
+ gvt_err("dup mmio definition offset %x\n",
+ info->offset);
+ info->size = size;
+ info->length = (i + 4) < end ? 4 : (end - i);
+ info->addr_mask = addr_mask;
+ info->device = device;
+ info->read = read;
+ info->write = write;
+ gvt->mmio.mmio_attribute[info->offset / 4] = flags;
+ INIT_HLIST_NODE(&info->node);
+ hash_add(gvt->mmio.mmio_info_table, &info->node, info->offset);
+ }
+ return 0;
+}
+
+#define MMIO_F(reg, s, f, am, rm, d, r, w) do { \
+ ret = new_mmio_info(gvt, INTEL_GVT_MMIO_OFFSET(reg), \
+ f, s, am, rm, d, r, w); \
+ if (ret) \
+ return ret; \
+} while (0)
+
+#define MMIO_D(reg, d) \
+ MMIO_F(reg, 4, 0, 0, 0, d, NULL, NULL)
+
+#define MMIO_DH(reg, d, r, w) \
+ MMIO_F(reg, 4, 0, 0, 0, d, r, w)
+
+#define MMIO_DFH(reg, d, f, r, w) \
+ MMIO_F(reg, 4, f, 0, 0, d, r, w)
+
+#define MMIO_GM(reg, d, r, w) \
+ MMIO_F(reg, 4, F_GMADR, 0xFFFFF000, 0, d, r, w)
+
+#define MMIO_RO(reg, d, f, rm, r, w) \
+ MMIO_F(reg, 4, F_RO | f, 0, rm, d, r, w)
+
+#define MMIO_RING_F(prefix, s, f, am, rm, d, r, w) do { \
+ MMIO_F(prefix(RENDER_RING_BASE), s, f, am, rm, d, r, w); \
+ MMIO_F(prefix(BLT_RING_BASE), s, f, am, rm, d, r, w); \
+ MMIO_F(prefix(GEN6_BSD_RING_BASE), s, f, am, rm, d, r, w); \
+ MMIO_F(prefix(VEBOX_RING_BASE), s, f, am, rm, d, r, w); \
+} while (0)
+
+#define MMIO_RING_D(prefix, d) \
+ MMIO_RING_F(prefix, 4, 0, 0, 0, d, NULL, NULL)
+
+#define MMIO_RING_DFH(prefix, d, f, r, w) \
+ MMIO_RING_F(prefix, 4, f, 0, 0, d, r, w)
+
+#define MMIO_RING_GM(prefix, d, r, w) \
+ MMIO_RING_F(prefix, 4, F_GMADR, 0xFFFF0000, 0, d, r, w)
+
+#define MMIO_RING_RO(prefix, d, f, rm, r, w) \
+ MMIO_RING_F(prefix, 4, F_RO | f, 0, rm, d, r, w)
+
+static int init_generic_mmio_info(struct intel_gvt *gvt)
+{
+ int ret;
+
+ MMIO_F(0, 0, 0, 0, 0, D_ALL, NULL, NULL);
+ return 0;
+}
+
+static int init_broadwell_mmio_info(struct intel_gvt *gvt)
+{
+ int ret;
+
+ MMIO_F(0, 0, 0, 0, 0, D_ALL, NULL, NULL);
+ return 0;
+}
+
+/**
+ * intel_gvt_find_mmio_info - find MMIO information entry by aligned offset
+ * @gvt: GVT device
+ * @offset: register offset
+ *
+ * This function is used to find the MMIO information entry from hash table
+ *
+ * Returns:
+ * pointer to MMIO information entry, NULL if not exists
+ */
+struct intel_gvt_mmio_info *intel_gvt_find_mmio_info(struct intel_gvt *gvt,
+ unsigned int offset)
+{
+ struct intel_gvt_mmio_info *e;
+
+ WARN_ON(!IS_ALIGNED(offset, 4));
+
+ hash_for_each_possible(gvt->mmio.mmio_info_table, e, node, offset) {
+ if (e->offset == offset)
+ return e;
+ }
+ return NULL;
+}
+
+/**
+ * intel_gvt_clean_mmio_info - clean up MMIO information table for GVT device
+ * @gvt: GVT device
+ *
+ * This function is called at the driver unloading stage, to clean up the MMIO
+ * information table of GVT device
+ *
+ */
+void intel_gvt_clean_mmio_info(struct intel_gvt *gvt)
+{
+ struct hlist_node *tmp;
+ struct intel_gvt_mmio_info *e;
+ int i;
+
+ hash_for_each_safe(gvt->mmio.mmio_info_table, i, tmp, e, node)
+ kfree(e);
+
+ vfree(gvt->mmio.mmio_attribute);
+ gvt->mmio.mmio_attribute = NULL;
+}
+
+/**
+ * intel_gvt_setup_mmio_info - setup MMIO information table for GVT device
+ * @gvt: GVT device
+ *
+ * This function is called at the initialization stage, to setup the MMIO
+ * information table for GVT device
+ *
+ * Returns:
+ * zero on success, negative if failed.
+ */
+int intel_gvt_setup_mmio_info(struct intel_gvt *gvt)
+{
+ struct intel_gvt_device_info *info = &gvt->device_info;
+ struct drm_i915_private *dev_priv = gvt->dev_priv;
+ int ret;
+
+ gvt->mmio.mmio_attribute = vzalloc(info->mmio_size);
+ if (!gvt->mmio.mmio_attribute)
+ return -ENOMEM;
+
+ ret = init_generic_mmio_info(gvt);
+ if (ret)
+ goto err;
+
+ if (IS_BROADWELL(dev_priv)) {
+ ret = init_broadwell_mmio_info(gvt);
+ if (ret)
+ goto err;
+ }
+ return 0;
+err:
+ intel_gvt_clean_mmio_info(gvt);
+ return ret;
+}