From: Linus Walleij <linus.walleij@linaro.org>
Date: Wed, 2 May 2018 15:47:19 +0200
Subject: drm/pl111: Enable device-specific assigned memory
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Git-commit: 57450671776b37d7c81cd52a89982c14bca46cfc
Patch-mainline: v4.18-rc1
References: FATE#326289 FATE#326079 FATE#326049 FATE#322398 FATE#326166

The Versatile Express has 8 MB of dedicated video RAM (VRAM)
on the motherboard, which is what we should be using for the
PL111 if available. On this platform, the memory backplane
is constructed so that only this memory will work properly
with the CLCD on the motherboard, using any other memory
area just gives random snow on the display.

The CA9 Versatile Express also has a PL111 instance on its
core tile that can address all memory, and this does not
have the restriction.

The memory is assigned to the device using the memory-region
device tree property and a "shared-dma-pool" reserved
memory pool like this:

reserved-memory {
        #address-cells = <1>;
        #size-cells = <1>;
        ranges;

        vram: vram@48000000 {
                compatible = "shared-dma-pool";
                reg = <0x48000000 0x00800000>;
                no-map;
        };
};

clcd@1f000 {
        compatible = "arm,pl111", "arm,primecell";
	(...)
        memory-region = <&vram>;
}·;

Cc: Liviu Dudau <liviu.dudau@arm.com>
Cc: Mali DP Maintainers <malidp@foss.arm.com>
Reviewed-by: Eric Anholt <eric@anholt.net>
Tested-by: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20180502134719.8388-2-linus.walleij@linaro.org

Acked-by: Petr Tesarik <ptesarik@suse.com>
---
 drivers/gpu/drm/pl111/pl111_drm.h |    1 +
 drivers/gpu/drm/pl111/pl111_drv.c |   34 ++++++++++++++++++++++++++++++++--
 2 files changed, 33 insertions(+), 2 deletions(-)

--- a/drivers/gpu/drm/pl111/pl111_drm.h
+++ b/drivers/gpu/drm/pl111/pl111_drm.h
@@ -79,6 +79,7 @@ struct pl111_drm_dev_private {
 	const struct pl111_variant_data *variant;
 	void (*variant_display_enable) (struct drm_device *drm, u32 format);
 	void (*variant_display_disable) (struct drm_device *drm);
+	bool use_device_memory;
 };
 
 int pl111_display_init(struct drm_device *dev);
--- a/drivers/gpu/drm/pl111/pl111_drv.c
+++ b/drivers/gpu/drm/pl111/pl111_drv.c
@@ -60,6 +60,7 @@
 #include <linux/slab.h>
 #include <linux/of.h>
 #include <linux/of_graph.h>
+#include <linux/of_reserved_mem.h>
 
 #include <drm/drmP.h>
 #include <drm/drm_atomic_helper.h>
@@ -207,6 +208,24 @@ finish:
 	return ret;
 }
 
+static struct drm_gem_object *
+pl111_gem_import_sg_table(struct drm_device *dev,
+			  struct dma_buf_attachment *attach,
+			  struct sg_table *sgt)
+{
+	struct pl111_drm_dev_private *priv = dev->dev_private;
+
+	/*
+	 * When using device-specific reserved memory we can't import
+	 * DMA buffers: those are passed by reference in any global
+	 * memory and we can only handle a specific range of memory.
+	 */
+	if (priv->use_device_memory)
+		return ERR_PTR(-EINVAL);
+
+	return drm_gem_cma_prime_import_sg_table(dev, attach, sgt);
+}
+
 DEFINE_DRM_GEM_CMA_FOPS(drm_fops);
 
 static struct drm_driver pl111_drm_driver = {
@@ -227,7 +246,7 @@ static struct drm_driver pl111_drm_drive
 	.prime_handle_to_fd = drm_gem_prime_handle_to_fd,
 	.prime_fd_to_handle = drm_gem_prime_fd_to_handle,
 	.gem_prime_import = drm_gem_prime_import,
-	.gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
+	.gem_prime_import_sg_table = pl111_gem_import_sg_table,
 	.gem_prime_export = drm_gem_prime_export,
 	.gem_prime_get_sg_table	= drm_gem_cma_prime_get_sg_table,
 
@@ -257,6 +276,12 @@ static int pl111_amba_probe(struct amba_
 	drm->dev_private = priv;
 	priv->variant = variant;
 
+	ret = of_reserved_mem_device_init(dev);
+	if (!ret) {
+		dev_info(dev, "using device-specific reserved memory\n");
+		priv->use_device_memory = true;
+	}
+
 	if (of_property_read_u32(dev->of_node, "max-memory-bandwidth",
 				 &priv->memory_bw)) {
 		dev_info(dev, "no max memory bandwidth specified, assume unlimited\n");
@@ -275,7 +300,8 @@ static int pl111_amba_probe(struct amba_
 	priv->regs = devm_ioremap_resource(dev, &amba_dev->res);
 	if (IS_ERR(priv->regs)) {
 		dev_err(dev, "%s failed mmio\n", __func__);
-		return PTR_ERR(priv->regs);
+		ret = PTR_ERR(priv->regs);
+		goto dev_unref;
 	}
 
 	/* This may override some variant settings */
@@ -305,11 +331,14 @@ static int pl111_amba_probe(struct amba_
 
 dev_unref:
 	drm_dev_unref(drm);
+	of_reserved_mem_device_release(dev);
+
 	return ret;
 }
 
 static int pl111_amba_remove(struct amba_device *amba_dev)
 {
+	struct device *dev = &amba_dev->dev;
 	struct drm_device *drm = amba_get_drvdata(amba_dev);
 	struct pl111_drm_dev_private *priv = drm->dev_private;
 
@@ -319,6 +348,7 @@ static int pl111_amba_remove(struct amba
 		drm_panel_bridge_remove(priv->bridge);
 	drm_mode_config_cleanup(drm);
 	drm_dev_unref(drm);
+	of_reserved_mem_device_release(dev);
 
 	return 0;
 }