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Date: Fri, 25 Jul 2008 09:24:24 +0100
From: Ben Dooks <ben-linux@...ff.org>
To: Haavard Skinnemoen <haavard.skinnemoen@...el.com>
Cc: Pierre Ossman <drzeus-list@...eus.cx>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v3 2/3] mmc: Add per-card debugfs support
On Thu, Jul 24, 2008 at 02:18:58PM +0200, Haavard Skinnemoen wrote:
> For each card successfully added to the bus, create a subdirectory under
> the host's debugfs root with information about the card.
>
> At the moment, only a single file is added to the card directory for
> all cards: "state". It reflects the "state" field in struct mmc_card,
> indicating whether the card is present, readonly, etc.
>
> For MMC and SD cards (not SDIO), another file is added: "status".
> Reading this file will ask the card about its current status and
> return it. This can be useful if the card just refuses to respond to
> any commands, which might indicate that the card state is not what the
> MMC core thinks it is (due to a missing stop command, for example.)
>
> Signed-off-by: Haavard Skinnemoen <haavard.skinnemoen@...el.com>
out of interest, why not have an standard sysfs node for the
current voltage setting?
> Changes since v2:
> * Don't rely on the compiler to optimize out unused code
which compiler? the gcc 4 series seem quite good at it, gcc 3.4
and later tended to eliminate only the code and not the associated
data created with it.
> Changes since v1:
> * move card debugfs stuff into debugfs.c
> * add "state" file corresponding to the "state" field in struct
> mmc_card.
> * only create the "status" file if the card is an MMC or SD memory
> card since SDIO doesn't support the SEND_STATUS command.
> ---
> drivers/mmc/core/bus.c | 8 ++++++
> drivers/mmc/core/core.h | 3 ++
> drivers/mmc/core/debugfs.c | 61 ++++++++++++++++++++++++++++++++++++++++++++
> include/linux/mmc/card.h | 2 +
> 4 files changed, 74 insertions(+), 0 deletions(-)
>
> diff --git a/drivers/mmc/core/bus.c b/drivers/mmc/core/bus.c
> index fd95b18..0d9b2d6 100644
> --- a/drivers/mmc/core/bus.c
> +++ b/drivers/mmc/core/bus.c
> @@ -252,6 +252,10 @@ int mmc_add_card(struct mmc_card *card)
> if (ret)
> return ret;
>
> +#ifdef CONFIG_DEBUG_FS
> + mmc_add_card_debugfs(card);
> +#endif
> +
why not make mmc_add_card_debugfs() an empty function
in the header if there is no debugfs support?
> mmc_card_set_present(card);
>
> return 0;
> @@ -263,6 +267,10 @@ int mmc_add_card(struct mmc_card *card)
> */
> void mmc_remove_card(struct mmc_card *card)
> {
> +#ifdef CONFIG_DEBUG_FS
> + mmc_remove_card_debugfs(card);
> +#endif
> +
ditto above comment.
> if (mmc_card_present(card)) {
> if (mmc_host_is_spi(card->host)) {
> printk(KERN_INFO "%s: SPI card removed\n",
> diff --git a/drivers/mmc/core/core.h b/drivers/mmc/core/core.h
> index 745da98..c819eff 100644
> --- a/drivers/mmc/core/core.h
> +++ b/drivers/mmc/core/core.h
> @@ -56,5 +56,8 @@ extern int use_spi_crc;
> void mmc_add_host_debugfs(struct mmc_host *host);
> void mmc_remove_host_debugfs(struct mmc_host *host);
>
#ifdef CONFIG_DEBUG_FS
void mmc_add_card_debugfs(struct mmc_card *card);
void mmc_remove_card_debugfs(struct mmc_card *card);
#else
static inline void mmc_add_card_debugfs(struct mmc_card *card) { }
static inline void mmc_remove_card_debugfs(struct mmc_card *card) { }
> #endif
>
> diff --git a/drivers/mmc/core/debugfs.c b/drivers/mmc/core/debugfs.c
> index 133c6e5..1237bb4 100644
> --- a/drivers/mmc/core/debugfs.c
> +++ b/drivers/mmc/core/debugfs.c
> @@ -12,9 +12,11 @@
> #include <linux/seq_file.h>
> #include <linux/stat.h>
>
> +#include <linux/mmc/card.h>
> #include <linux/mmc/host.h>
>
> #include "core.h"
> +#include "mmc_ops.h"
>
> /* The debugfs functions are optimized away when CONFIG_DEBUG_FS isn't set. */
> static int mmc_ios_show(struct seq_file *s, void *data)
> @@ -162,3 +164,62 @@ void mmc_remove_host_debugfs(struct mmc_host *host)
> {
> debugfs_remove_recursive(host->debugfs_root);
> }
> +
> +static int mmc_dbg_card_status_get(void *data, u64 *val)
> +{
> + struct mmc_card *card = data;
> + u32 status;
> + int ret;
> +
> + mmc_claim_host(card->host);
> +
> + ret = mmc_send_status(data, &status);
> + if (!ret)
> + *val = status;
> +
> + mmc_release_host(card->host);
> +
> + return ret;
> +}
> +DEFINE_SIMPLE_ATTRIBUTE(mmc_dbg_card_status_fops, mmc_dbg_card_status_get,
> + NULL, "%08llx\n");
> +
> +void mmc_add_card_debugfs(struct mmc_card *card)
> +{
> + struct mmc_host *host = card->host;
> + struct dentry *root;
> +
> + if (!host->debugfs_root)
> + return;
> +
> + root = debugfs_create_dir(mmc_card_id(card), host->debugfs_root);
> + if (IS_ERR(root))
> + /* Don't complain -- debugfs just isn't enabled */
> + return;
> + if (!root)
> + /* Complain -- debugfs is enabled, but it failed to
> + * create the directory. */
> + goto err;
> +
> + card->debugfs_root = root;
> +
> + if (!debugfs_create_x32("state", S_IRUSR, root, &card->state))
> + goto err;
> +
> + if (mmc_card_mmc(card) || mmc_card_sd(card))
> + if (!debugfs_create_file("status", S_IRUSR, root, card,
> + &mmc_dbg_card_status_fops))
> + goto err;
> +
> + return;
> +
> +err:
> + debugfs_remove_recursive(root);
> + card->debugfs_root = NULL;
> + dev_err(&card->dev, "failed to initialize debugfs\n");
> +}
> +
> +void mmc_remove_card_debugfs(struct mmc_card *card)
> +{
> + debugfs_remove_recursive(card->debugfs_root);
> +}
> diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
> index 0d508ac..ee6e822 100644
> --- a/include/linux/mmc/card.h
> +++ b/include/linux/mmc/card.h
> @@ -111,6 +111,8 @@ struct mmc_card {
> unsigned num_info; /* number of info strings */
> const char **info; /* info strings */
> struct sdio_func_tuple *tuples; /* unknown common tuples */
> +
> + struct dentry *debugfs_root;
> };
>
> #define mmc_card_mmc(c) ((c)->type == MMC_TYPE_MMC)
> --
> 1.5.6.2
>
> --
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--
Ben (ben@...ff.org, http://www.fluff.org/)
'a smiley only costs 4 bytes'
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