From kaneshige.kenji@jp.fujitsu.com Mon May 1 19:15:35 2006 Message-ID: <4456C015.7080604@jp.fujitsu.com> Date: Tue, 02 May 2006 11:12:37 +0900 From: Kenji Kaneshige To: Greg KH , Kristen Accardi Cc: Kenji Kaneshige Subject: SHPC: Fix SHPC Contoller SERR-INT Register bits access Current SHPCHP driver doesn't take care of RsvdP/RsvdZ[*] bits in controller SERR-INT register. This might cause unpredicable results. This patch fixes this bug. [*] RsvdP and RsvdZ are defined in SHPC spec as follows: RsvdP - Reserved and Preserved. Register bits of this type are reserved for future use as R/W bits. The value read is undefined. Writes are ignored. Software must follow These rules when accessing RsvdP bits: - Software must ignore RsvdP bits when testing values read from these registers. - Software must not depend on RsvdP bit's ability to retain information when written - Software must always write back the value read in the RsvdP bits when writing one of these registers. RsvdZ - Reserved and Zero. Register bits of this type are reserved for future use as R/WC bits. The value read is undefined. Writes are ignored. Software must follow these rules when accessing RsvdZ bits: - Software must ignore RsvdZ bits when testing values read from these registers. - Software must not depends on a RsvdZ bit's ability to retain information when written. - Software must always write 0 to RsvdZ bits when writing one of these register. Signed-off-by: Kenji Kaneshige Cc: Kristen Accardi Signed-off-by: Greg Kroah-Hartman --- drivers/pci/hotplug/shpchp_hpc.c | 25 ++++++++++++++++++++----- 1 file changed, 20 insertions(+), 5 deletions(-) --- gregkh-2.6.orig/drivers/pci/hotplug/shpchp_hpc.c +++ gregkh-2.6/drivers/pci/hotplug/shpchp_hpc.c @@ -91,6 +91,17 @@ #define ATTN_BUTTON 0x80000000 /* + * Controller SERR-INT Register + */ +#define GLOBAL_INTR_MASK (1 << 0) +#define GLOBAL_SERR_MASK (1 << 1) +#define COMMAND_INTR_MASK (1 << 2) +#define ARBITER_SERR_MASK (1 << 3) +#define COMMAND_DETECTED (1 << 16) +#define ARBITER_DETECTED (1 << 17) +#define SERR_INTR_RSVDZ_MASK 0xfffc0000 + +/* * Logical Slot Register definitions */ #define SLOT_REG(i) (SLOT1 + (4 * i)) @@ -1047,7 +1058,8 @@ static irqreturn_t shpc_isr(int IRQ, voi /* Mask Global Interrupt Mask - see implementation note on p. 139 */ /* of SHPC spec rev 1.0*/ temp_dword = shpc_readl(ctrl, SERR_INTR_ENABLE); - temp_dword |= 0x00000001; + temp_dword |= GLOBAL_INTR_MASK; + temp_dword &= ~SERR_INTR_RSVDZ_MASK; shpc_writel(ctrl, SERR_INTR_ENABLE, temp_dword); intr_loc2 = shpc_readl(ctrl, INTR_LOC); @@ -1061,7 +1073,7 @@ static irqreturn_t shpc_isr(int IRQ, voi * Detect bit in Controller SERR-INT register */ temp_dword = shpc_readl(ctrl, SERR_INTR_ENABLE); - temp_dword &= 0xfffdffff; + temp_dword &= ~SERR_INTR_RSVDZ_MASK; shpc_writel(ctrl, SERR_INTR_ENABLE, temp_dword); ctrl->cmd_busy = 0; wake_up_interruptible(&ctrl->queue); @@ -1105,7 +1117,7 @@ static irqreturn_t shpc_isr(int IRQ, voi if (!shpchp_poll_mode) { /* Unmask Global Interrupt Mask */ temp_dword = shpc_readl(ctrl, SERR_INTR_ENABLE); - temp_dword &= 0xfffffffe; + temp_dword &= ~(GLOBAL_INTR_MASK | SERR_INTR_RSVDZ_MASK); shpc_writel(ctrl, SERR_INTR_ENABLE, temp_dword); } @@ -1374,7 +1386,9 @@ int shpc_init(struct controller * ctrl, /* Mask Global Interrupt Mask & Command Complete Interrupt Mask */ tempdword = shpc_readl(ctrl, SERR_INTR_ENABLE); dbg("%s: SERR_INTR_ENABLE = %x\n", __FUNCTION__, tempdword); - tempdword = 0x0003000f; + tempdword |= (GLOBAL_INTR_MASK | GLOBAL_SERR_MASK | + COMMAND_INTR_MASK | ARBITER_SERR_MASK); + tempdword &= ~SERR_INTR_RSVDZ_MASK; shpc_writel(ctrl, SERR_INTR_ENABLE, tempdword); tempdword = shpc_readl(ctrl, SERR_INTR_ENABLE); dbg("%s: SERR_INTR_ENABLE = %x\n", __FUNCTION__, tempdword); @@ -1452,7 +1466,8 @@ int shpc_init(struct controller * ctrl, if (!shpchp_poll_mode) { /* Unmask all general input interrupts and SERR */ tempdword = shpc_readl(ctrl, SERR_INTR_ENABLE); - tempdword = 0x0000000a; + tempdword &= ~(GLOBAL_INTR_MASK | COMMAND_INTR_MASK | + SERR_INTR_RSVDZ_MASK); shpc_writel(ctrl, SERR_INTR_ENABLE, tempdword); tempdword = shpc_readl(ctrl, SERR_INTR_ENABLE); dbg("%s: SERR_INTR_ENABLE = %x\n", __FUNCTION__, tempdword);