[28/34] brcmfmac: pcie: Replace brcmf_pcie_copy_mem_todev with memcpy_toio

Commit Message

Hector Martin Dec. 26, 2021, 3:36 p.m. UTC

The alignment check was wrong (e.g. & 4 instead of & 3), and the logic
was also inefficient if the length was not a multiple of 4, since it
would needlessly fall back to copying the entire buffer bytewise.

We already have a perfectly good memcpy_toio function, so just call that
instead of rolling our own copy logic here. brcmf_pcie_init_ringbuffers
was already using it anyway.

Fixes: 9e37f045d5e7 ("brcmfmac: Adding PCIe bus layer support.")
Signed-off-by: Hector Martin <[e-mail]>
---
 .../broadcom/brcm80211/brcmfmac/pcie.c        | 53 +++----------------
 1 file changed, 6 insertions(+), 47 deletions(-)

Comments

Linus Walleij Jan. 2, 2022, 6:15 a.m. UTC | #1

On Sun, Dec 26, 2021 at 4:40 PM Hector Martin <[e-mail]> wrote:

> The alignment check was wrong (e.g. & 4 instead of & 3), and the logic
> was also inefficient if the length was not a multiple of 4, since it
> would needlessly fall back to copying the entire buffer bytewise.
>
> We already have a perfectly good memcpy_toio function, so just call that
> instead of rolling our own copy logic here. brcmf_pcie_init_ringbuffers
> was already using it anyway.
>
> Fixes: 9e37f045d5e7 ("brcmfmac: Adding PCIe bus layer support.")
> Signed-off-by: Hector Martin <[e-mail]>

Excellent patch.
Reviewed-by: Linus Walleij <[e-mail]>

Yours,
Linus Walleij

Patch

diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c
index 0d073087b01b..6cf55027e0d7 100644
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/pcie.c
@@ -13,6 +13,7 @@ 
 #include <linux/bcma/bcma.h>
 #include <linux/sched.h>
 #include <linux/random.h>
+#include <linux/io.h>
 #include <asm/unaligned.h>
 
 #include <soc.h>
@@ -559,47 +560,6 @@  brcmf_pcie_write_ram32(struct brcmf_pciedev_info *devinfo, u32 mem_offset,
 }
 
 
-static void
-brcmf_pcie_copy_mem_todev(struct brcmf_pciedev_info *devinfo, u32 mem_offset,
-			  void *srcaddr, u32 len)
-{
-	void __iomem *address = devinfo->tcm + mem_offset;
-	__le32 *src32;
-	__le16 *src16;
-	u8 *src8;
-
-	if (((ulong)address & 4) || ((ulong)srcaddr & 4) || (len & 4)) {
-		if (((ulong)address & 2) || ((ulong)srcaddr & 2) || (len & 2)) {
-			src8 = (u8 *)srcaddr;
-			while (len) {
-				iowrite8(*src8, address);
-				address++;
-				src8++;
-				len--;
-			}
-		} else {
-			len = len / 2;
-			src16 = (__le16 *)srcaddr;
-			while (len) {
-				iowrite16(le16_to_cpu(*src16), address);
-				address += 2;
-				src16++;
-				len--;
-			}
-		}
-	} else {
-		len = len / 4;
-		src32 = (__le32 *)srcaddr;
-		while (len) {
-			iowrite32(le32_to_cpu(*src32), address);
-			address += 4;
-			src32++;
-			len--;
-		}
-	}
-}
-
-
 static void
 brcmf_pcie_copy_dev_tomem(struct brcmf_pciedev_info *devinfo, u32 mem_offset,
 			  void *dstaddr, u32 len)
@@ -1697,8 +1657,8 @@  static int brcmf_pcie_download_fw_nvram(struct brcmf_pciedev_info *devinfo,
 		return err;
 
 	brcmf_dbg(PCIE, "Download FW %s\n", devinfo->fw_name);
-	brcmf_pcie_copy_mem_todev(devinfo, devinfo->ci->rambase,
-				  (void *)fw->data, fw->size);
+	memcpy_toio(devinfo->tcm + devinfo->ci->rambase,
+		    (void *)fw->data, fw->size);
 
 	resetintr = get_unaligned_le32(fw->data);
 	release_firmware(fw);
@@ -1719,7 +1679,7 @@  static int brcmf_pcie_download_fw_nvram(struct brcmf_pciedev_info *devinfo,
 		brcmf_dbg(PCIE, "Download NVRAM %s\n", devinfo->nvram_name);
 		address = devinfo->ci->rambase + devinfo->ci->ramsize -
 			  nvram_len;
-		brcmf_pcie_copy_mem_todev(devinfo, address, nvram, nvram_len);
+		memcpy_toio(devinfo->tcm + address, nvram, nvram_len);
 		brcmf_fw_nvram_free(nvram);
 
 		/* Some Apple chips/firmwares expect a buffer of random data
@@ -1728,13 +1688,12 @@  static int brcmf_pcie_download_fw_nvram(struct brcmf_pciedev_info *devinfo,
 		brcmf_dbg(PCIE, "Download random seed\n");
 
 		address -= sizeof(footer);
-		brcmf_pcie_copy_mem_todev(devinfo, address, &footer,
-					  sizeof(footer));
+		memcpy_toio(devinfo->tcm + address, &footer, sizeof(footer));
 
 		address -= rand_len;
 		randbuf = kzalloc(rand_len, GFP_KERNEL);
 		get_random_bytes(randbuf, rand_len);
-		brcmf_pcie_copy_mem_todev(devinfo, address, randbuf, rand_len);
+		memcpy_toio(devinfo->tcm + address, randbuf, rand_len);
 		kfree(randbuf);
 	} else {
 		brcmf_dbg(PCIE, "No matching NVRAM file found %s\n",