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Message-Id: <516375d6d06114484533baf03aae351306100246.1641500561.git.christophe.jaillet@wanadoo.fr>
Date: Thu, 6 Jan 2022 22:54:39 +0100
From: Christophe JAILLET <christophe.jaillet@...adoo.fr>
To: arnd@...db.de, hch@...radead.org, akpm@...ux-foundation.org,
sathya.prakash@...adcom.com, sreekanth.reddy@...adcom.com,
suganath-prabu.subramani@...adcom.com
Cc: MPT-FusionLinux.pdl@...adcom.com, linux-scsi@...r.kernel.org,
linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org,
Christophe JAILLET <christophe.jaillet@...adoo.fr>
Subject: [PATCH 15/16] scsi: mptctl: Use dma_alloc_coherent()
In [1], Christoph Hellwig has proposed to remove the wrappers in
include/linux/pci-dma-compat.h.
Some reasons why this API should be removed have been given by Julia
Lawall in [2].
When memory is allocated in kbuf_alloc_2_sgl() GFP_KERNEL can be used
because this function already uses the GFP_USER flag for some memory
allocation and not spin_lock is taken in the between.
When memory is allocated in mptctl_do_mpt_command() GFP_KERNEL can be
used because this function already uses copy_from_user() and this
function can sleep.
When memory is allocated in mptctl_hp_hostinfo() GFP_KERNEL can be used
because this function already uses mpt_config() and this function has
an explicit might_sleep().
When memory is allocated in mptctl_hp_targetinfo() GFP_KERNEL can be used
because this function already uses mpt_config() and this function has
an explicit might_sleep().
[1]: https://lore.kernel.org/kernel-janitors/20200421081257.GA131897@infradead.org/
[2]: https://lore.kernel.org/kernel-janitors/alpine.DEB.2.22.394.2007120902170.2424@hadrien/
Signed-off-by: Christophe JAILLET <christophe.jaillet@...adoo.fr>
---
I'm a bit unsure about the use of GFP_KERNEL in kbuf_alloc_2_sgl().
In all conversion that I've done, GFP_USER was never used. I don't fully
understand the difference between GFP_USER and GFP_KERNEL.
---
drivers/message/fusion/mptctl.c | 31 +++++++++++++++++++------------
1 file changed, 19 insertions(+), 12 deletions(-)
diff --git a/drivers/message/fusion/mptctl.c b/drivers/message/fusion/mptctl.c
index 0f447179e3f5..03c8fb1795c2 100644
--- a/drivers/message/fusion/mptctl.c
+++ b/drivers/message/fusion/mptctl.c
@@ -1041,7 +1041,8 @@ kbuf_alloc_2_sgl(int bytes, u32 sgdir, int sge_offset, int *frags,
* copying the data in this array into the correct place in the
* request and chain buffers.
*/
- sglbuf = pci_alloc_consistent(ioc->pcidev, MAX_SGL_BYTES, sglbuf_dma);
+ sglbuf = dma_alloc_coherent(&ioc->pcidev->dev, MAX_SGL_BYTES,
+ sglbuf_dma, GFP_KERNEL);
if (sglbuf == NULL)
goto free_and_fail;
@@ -1062,9 +1063,9 @@ kbuf_alloc_2_sgl(int bytes, u32 sgdir, int sge_offset, int *frags,
while (bytes_allocd < bytes) {
this_alloc = min(alloc_sz, bytes-bytes_allocd);
buflist[buflist_ent].len = this_alloc;
- buflist[buflist_ent].kptr = pci_alloc_consistent(ioc->pcidev,
- this_alloc,
- &pa);
+ buflist[buflist_ent].kptr = dma_alloc_coherent(&ioc->pcidev->dev,
+ this_alloc,
+ &pa, GFP_KERNEL);
if (buflist[buflist_ent].kptr == NULL) {
alloc_sz = alloc_sz / 2;
if (alloc_sz == 0) {
@@ -2105,8 +2106,9 @@ mptctl_do_mpt_command (MPT_ADAPTER *ioc, struct mpt_ioctl_command karg, void __u
}
flagsLength |= karg.dataOutSize;
bufOut.len = karg.dataOutSize;
- bufOut.kptr = pci_alloc_consistent(
- ioc->pcidev, bufOut.len, &dma_addr_out);
+ bufOut.kptr = dma_alloc_coherent(&ioc->pcidev->dev,
+ bufOut.len,
+ &dma_addr_out, GFP_KERNEL);
if (bufOut.kptr == NULL) {
rc = -ENOMEM;
@@ -2139,8 +2141,9 @@ mptctl_do_mpt_command (MPT_ADAPTER *ioc, struct mpt_ioctl_command karg, void __u
flagsLength |= karg.dataInSize;
bufIn.len = karg.dataInSize;
- bufIn.kptr = pci_alloc_consistent(ioc->pcidev,
- bufIn.len, &dma_addr_in);
+ bufIn.kptr = dma_alloc_coherent(&ioc->pcidev->dev,
+ bufIn.len,
+ &dma_addr_in, GFP_KERNEL);
if (bufIn.kptr == NULL) {
rc = -ENOMEM;
@@ -2400,7 +2403,9 @@ mptctl_hp_hostinfo(MPT_ADAPTER *ioc, unsigned long arg, unsigned int data_size)
/* Issue the second config page request */
cfg.action = MPI_CONFIG_ACTION_PAGE_READ_CURRENT;
- pbuf = pci_alloc_consistent(ioc->pcidev, hdr.PageLength * 4, &buf_dma);
+ pbuf = dma_alloc_coherent(&ioc->pcidev->dev,
+ hdr.PageLength * 4,
+ &buf_dma, GFP_KERNEL);
if (pbuf) {
cfg.physAddr = buf_dma;
if (mpt_config(ioc, &cfg) == 0) {
@@ -2477,7 +2482,7 @@ mptctl_hp_hostinfo(MPT_ADAPTER *ioc, unsigned long arg, unsigned int data_size)
else
IstwiRWRequest->DeviceAddr = 0xB0;
- pbuf = pci_alloc_consistent(ioc->pcidev, 4, &buf_dma);
+ pbuf = dma_alloc_coherent(&ioc->pcidev->dev, 4, &buf_dma, GFP_KERNEL);
if (!pbuf)
goto out;
ioc->add_sge((char *)&IstwiRWRequest->SGL,
@@ -2592,7 +2597,8 @@ mptctl_hp_targetinfo(MPT_ADAPTER *ioc, unsigned long arg)
/* Get the data transfer speeds
*/
data_sz = ioc->spi_data.sdp0length * 4;
- pg0_alloc = pci_alloc_consistent(ioc->pcidev, data_sz, &page_dma);
+ pg0_alloc = dma_alloc_coherent(&ioc->pcidev->dev, data_sz, &page_dma,
+ GFP_KERNEL);
if (pg0_alloc) {
hdr.PageVersion = ioc->spi_data.sdp0version;
hdr.PageLength = data_sz;
@@ -2657,7 +2663,8 @@ mptctl_hp_targetinfo(MPT_ADAPTER *ioc, unsigned long arg)
/* Issue the second config page request */
cfg.action = MPI_CONFIG_ACTION_PAGE_READ_CURRENT;
data_sz = (int) cfg.cfghdr.hdr->PageLength * 4;
- pg3_alloc = pci_alloc_consistent(ioc->pcidev, data_sz, &page_dma);
+ pg3_alloc = dma_alloc_coherent(&ioc->pcidev->dev, data_sz,
+ &page_dma, GFP_KERNEL);
if (pg3_alloc) {
cfg.physAddr = page_dma;
cfg.pageAddr = (karg.hdr.channel << 8) | karg.hdr.id;
--
2.32.0
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