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authorThomas Zimmermann <tzimmermann@suse.de>2021-09-16 20:15:58 +0200
committerThomas Zimmermann <tzimmermann@suse.de>2021-09-23 09:25:59 +0200
commitc822310725ee41af663de2448094155d442ff871 (patch)
treef335ea75047366a1ad7d052e820da101466c71ad /lib
parent3229b906fb35b63515f0c703b917357c83e1ea22 (diff)
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lib: devres: Add managed arch_io_reserve_memtype_wc()
Add devm_arch_io_reserve_memtype_wc() as managed wrapper around arch_io_reserve_memtype_wc(). 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/20210916181601.9146-3-tzimmermann@suse.de
Diffstat (limited to 'lib')
-rw-r--r--lib/devres.c46
1 files changed, 46 insertions, 0 deletions
diff --git a/lib/devres.c b/lib/devres.c
index 24d4d849ff67..14664bbb4875 100644
--- a/lib/devres.c
+++ b/lib/devres.c
@@ -564,3 +564,49 @@ int devm_arch_phys_wc_add(struct device *dev, unsigned long base, unsigned long
return ret;
}
EXPORT_SYMBOL(devm_arch_phys_wc_add);
+
+struct arch_io_reserve_memtype_wc_devres {
+ resource_size_t start;
+ resource_size_t size;
+};
+
+static void devm_arch_io_free_memtype_wc_release(struct device *dev, void *res)
+{
+ const struct arch_io_reserve_memtype_wc_devres *this = res;
+
+ arch_io_free_memtype_wc(this->start, this->size);
+}
+
+/**
+ * devm_arch_io_reserve_memtype_wc - Managed arch_io_reserve_memtype_wc()
+ * @dev: Managed device
+ * @start: Memory base address
+ * @size: Size of memory range
+ *
+ * Reserves a memory range with WC caching using arch_io_reserve_memtype_wc()
+ * and sets up a release callback See arch_io_reserve_memtype_wc() for more
+ * information.
+ */
+int devm_arch_io_reserve_memtype_wc(struct device *dev, resource_size_t start,
+ resource_size_t size)
+{
+ struct arch_io_reserve_memtype_wc_devres *dr;
+ int ret;
+
+ dr = devres_alloc(devm_arch_io_free_memtype_wc_release, sizeof(*dr), GFP_KERNEL);
+ if (!dr)
+ return -ENOMEM;
+
+ ret = arch_io_reserve_memtype_wc(start, size);
+ if (ret < 0) {
+ devres_free(dr);
+ return ret;
+ }
+
+ dr->start = start;
+ dr->size = size;
+ devres_add(dev, dr);
+
+ return ret;
+}
+EXPORT_SYMBOL(devm_arch_io_reserve_memtype_wc);