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authorThomas Zimmermann <tzimmermann@suse.de>2021-09-16 20:15:57 +0200
committerThomas Zimmermann <tzimmermann@suse.de>2021-09-23 09:25:30 +0200
commit3229b906fb35b63515f0c703b917357c83e1ea22 (patch)
tree3298b13ffec3213c09f0d0dac094aca72f24e2e1 /lib/devres.c
parent9c2fce137852e6434ca0c6fe3d75e00feb168c07 (diff)
downloadlwn-3229b906fb35b63515f0c703b917357c83e1ea22.tar.gz
lwn-3229b906fb35b63515f0c703b917357c83e1ea22.zip
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
Diffstat (limited to 'lib/devres.c')
-rw-r--r--lib/devres.c36
1 files changed, 36 insertions, 0 deletions
diff --git a/lib/devres.c b/lib/devres.c
index b0e1c6702c71..24d4d849ff67 100644
--- 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);