AuxXxilium/linux_dsm_epyc7002
1
0
Fork 0
mirror of https://github.com/AuxXxilium/linux_dsm_epyc7002.git synced 2024-12-03 04:36:51 +07:00
Code Issues Actions Packages Projects Releases Wiki Activity

mmc: sdhci: convert ADMA descriptors to a coherent allocation

Browse Source 
Rather than using the streaming API, use the coherent allocator to
provide this memory, thereby eliminating cache flushing of it each
time we map and unmap it.  This results in a 7.5% increase in
transfer speed with a UHS-1 card operating in 3.3v mode at a clock
of 49.5MHz.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Tested-by: Markus Pargmann <mpa@pengutronix.de>
Tested-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Chris Ball <chris@printf.net>
This commit is contained in:
Russell King 2014-04-25 12:58:34 +01:00 committed by Chris Ball
parent de0b65a786
commit d1e49f77d7
1 changed files with 22 additions and 21 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

43
drivers/mmc/host/sdhci.c
View File

@ -44,6 +44,8 @@
#define MAX_TUNING_LOOP 40
#define ADMA_SIZE ((128 * 2 + 1) * 4)
static unsigned int debug_quirks = 0;
static unsigned int debug_quirks2;
@ -481,11 +483,6 @@ static int sdhci_adma_table_pre(struct sdhci_host *host,
else
direction = DMA_TO_DEVICE;
/*
* The ADMA descriptor table is mapped further down as we
* need to fill it with data first.
*/
host->align_addr = dma_map_single(mmc_dev(host->mmc),
host->align_buffer, 128 * 4, direction);
if (dma_mapping_error(mmc_dev(host->mmc), host->align_addr))
@ -546,7 +543,7 @@ static int sdhci_adma_table_pre(struct sdhci_host *host,
* If this triggers then we have a calculation bug
* somewhere. :/
*/
WARN_ON((desc - host->adma_desc) > (128 * 2 + 1) * 4);
WARN_ON((desc - host->adma_desc) > ADMA_SIZE);
}
if (host->quirks & SDHCI_QUIRK_NO_ENDATTR_IN_NOPDESC) {
@ -574,17 +571,8 @@ static int sdhci_adma_table_pre(struct sdhci_host *host,
host->align_addr, 128 * 4, direction);
}
host->adma_addr = dma_map_single(mmc_dev(host->mmc),
host->adma_desc, (128 * 2 + 1) * 4, DMA_TO_DEVICE);
if (dma_mapping_error(mmc_dev(host->mmc), host->adma_addr))
goto unmap_entries;
BUG_ON(host->adma_addr & 0x3);
return 0;
unmap_entries:
dma_unmap_sg(mmc_dev(host->mmc), data->sg,
data->sg_len, direction);
unmap_align:
dma_unmap_single(mmc_dev(host->mmc), host->align_addr,
128 * 4, direction);
@ -609,9 +597,6 @@ static void sdhci_adma_table_post(struct sdhci_host *host,
else
direction = DMA_TO_DEVICE;
dma_unmap_single(mmc_dev(host->mmc), host->adma_addr,
(128 * 2 + 1) * 4, DMA_TO_DEVICE);
dma_unmap_single(mmc_dev(host->mmc), host->align_addr,
128 * 4, direction);
@ -2856,15 +2841,29 @@ int sdhci_add_host(struct sdhci_host *host)
* (128) and potentially one alignment transfer for
* each of those entries.
*/
host->adma_desc = kmalloc((128 * 2 + 1) * 4, GFP_KERNEL);
host->adma_desc = dma_alloc_coherent(mmc_dev(host->mmc),
ADMA_SIZE, &host->adma_addr,
GFP_KERNEL);
host->align_buffer = kmalloc(128 * 4, GFP_KERNEL);
if (!host->adma_desc || !host->align_buffer) {
kfree(host->adma_desc);
dma_free_coherent(mmc_dev(host->mmc), ADMA_SIZE,
host->adma_desc, host->adma_addr);
kfree(host->align_buffer);
pr_warning("%s: Unable to allocate ADMA "
"buffers. Falling back to standard DMA.\n",
mmc_hostname(mmc));
host->flags &= ~SDHCI_USE_ADMA;
host->adma_desc = NULL;
host->align_buffer = NULL;
} else if (host->adma_addr & 3) {
pr_warning("%s: unable to allocate aligned ADMA descriptor\n",
mmc_hostname(mmc));
host->flags &= ~SDHCI_USE_ADMA;
dma_free_coherent(mmc_dev(host->mmc), ADMA_SIZE,
host->adma_desc, host->adma_addr);
kfree(host->align_buffer);
host->adma_desc = NULL;
host->align_buffer = NULL;
}
}
@ -3342,7 +3341,9 @@ void sdhci_remove_host(struct sdhci_host *host, int dead)
regulator_put(host->vqmmc);
}
kfree(host->adma_desc);
if (host->adma_desc)
dma_free_coherent(mmc_dev(host->mmc), ADMA_SIZE,
host->adma_desc, host->adma_addr);
kfree(host->align_buffer);
host->adma_desc = NULL;