lib: devres: Add managed arch_phys_wc_add()

Add devm_arch_phys_wc_add() as managed wrapper around arch_phys_wc_add().
Useful for several graphics drivers that set framebuffer memory to write
combining.

v2:
	* fix typo in commit description

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Hans de Goede <hdegoede@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210916181601.9146-2-tzimmermann@suse.de

diff --git a/include/linux/io.h b/include/linux/io.h
index 9595151..fcd8ea7 100644 (file)
--- a/include/linux/io.h
+++ b/include/linux/io.h
@@ -132,6 +132,8 @@ static inline int arch_phys_wc_index(int handle)
 #endif
 #endif
 
+int devm_arch_phys_wc_add(struct device *dev, unsigned long base, unsigned long size);
+
 enum {
        /* See memremap() kernel-doc for usage description... */
        MEMREMAP_WB = 1 << 0,

diff --git a/lib/devres.c b/lib/devres.c
index b0e1c67..24d4d84 100644 (file)
--- a/lib/devres.c
+++ b/lib/devres.c
@@ -528,3 +528,39 @@ void pcim_iounmap_regions(struct pci_dev *pdev, int mask)
 }
 EXPORT_SYMBOL(pcim_iounmap_regions);
 #endif /* CONFIG_PCI */
+
+static void devm_arch_phys_ac_add_release(struct device *dev, void *res)
+{
+       arch_phys_wc_del(*((int *)res));
+}
+
+/**
+ * devm_arch_phys_wc_add - Managed arch_phys_wc_add()
+ * @dev: Managed device
+ * @base: Memory base address
+ * @size: Size of memory range
+ *
+ * Adds a WC MTRR using arch_phys_wc_add() and sets up a release callback.
+ * See arch_phys_wc_add() for more information.
+ */
+int devm_arch_phys_wc_add(struct device *dev, unsigned long base, unsigned long size)
+{
+       int *mtrr;
+       int ret;
+
+       mtrr = devres_alloc(devm_arch_phys_ac_add_release, sizeof(*mtrr), GFP_KERNEL);
+       if (!mtrr)
+               return -ENOMEM;
+
+       ret = arch_phys_wc_add(base, size);
+       if (ret < 0) {
+               devres_free(mtrr);
+               return ret;
+       }
+
+       *mtrr = ret;
+       devres_add(dev, mtrr);
+
+       return ret;
+}
+EXPORT_SYMBOL(devm_arch_phys_wc_add);